ES2980661T3 - Toilet cistern flush valve with adjustable drainage speed - Google Patents

Abstract

The drain valve with adjustable drainage speed of the present invention uses a reversible flap (10) to control the outlet size of the water outlet (72) of the drain valve, that is, to adjust the water passage area of the water outlet (72) of the drain valve, and then control the drainage speed of the drain valve and finally adjust the drainage speed of the toilet. (Automatic translation with Google Translate, no legal value)

Description

DESCRIPTION

Toilet cistern flush valve with adjustable drainage speed

FIELD OF INVENTION

The present invention relates to a drain valve for a toilet cistern and, in particular, relates to a drain valve with an adjustable drainage speed.

BACKGROUND OF THE INVENTION

When a toilet is flushed and drained, the flushing performance is mainly determined by the drainage volume and the drainage speed. Among them, an amount of the drainage volume can be adjusted by adjusting a preset position of a float to achieve a predetermined amount of the drainage volume so as to meet a water demand of different toilets. The drainage speed is mainly determined by the size of a spray hole, when the spray hole becomes smaller, the drainage speed increases and the flushing performance improves.

The spray hole is arranged on a ceramic body of the toilet, and the size of the spray hole cannot be adjusted, that is, the drainage speed cannot be adjusted according to the requirements of users. In addition, if the drainage speed is increased by adjusting the spray hole, it will cause problems such as increased noise and water splashing.

DE 20 2016 104 089 U describes a device for throttling the flush flow of a sanitary cistern, comprising a drain valve having a valve socket, a valve body having a sealing surface, a drain connection and a valve seat formed in the drain connection. The valve body is movably mounted in the valve socket.

US 2010 170031 A relates to a water tank flush valve assembly structure. The flush valve assembly structure includes a valve seat, a guide rod and a canister flush valve. The canister flush valve seals a flow path from an interior of the water tank to a toilet bowl and can be raised to separate from the valve seat to form a valve port. A water passage part is mounted on the canister flush valve and a water passage post is arranged on the water passage part. A water inlet is arranged on the water passage post, which can be appropriately blocked by a block wall correspondingly arranged on the bottom wall. Meanwhile, a position of the water passage post can be adjusted to change the degree to which the water inlet is blocked, so as to change the volume of flush water flow entering the canister flush valve from the water inlet.

Document DE 102015 016 737 A relates to a drainage fitting for a cistern having a housing in which a movable valve plate of a drainage valve is arranged, such that a valve gap of the drainage valve is created by lifting the valve plate and the flushing water in the cistern flows out of the cistern via a flow path through at least one flow window formed in the housing and through the open valve gap.

WO 96 14479 A describes an improved flush valve comprising an upper housing, a main valve assembly movable upwardly within the housing and forming with the top thereof an upper chamber of variable volume, a restricted passage between the upper chamber and the outside thereof, an outlet leading downwardly from the bottom of the housing, a seat for the main valve assembly at the inlet to the outlet so that, in the lowered position of the main valve assembly, the outlet is blocked against the fluid inlet where the device is immersed, and a pilot valve remotely operable from the housing to bring the upper chamber into free communication with the outlet.

WO 2017 036877 A relates to a flush valve for a toilet tank having: an outlet opening; an overflow pipe movable between an open position and a closed position to open and close the outlet opening; a regulator which is located downstream of the overflow pipe and is designed to set the volume of flush water flowing through the flush valve when the flush valve is opened, the regulator comprising actuating means actuatable to adjust the regulator (30) when the flush valve is in the assembled state.

Document ES 2097680 A describes a device for retaining water, in order to save water, in the operation of toilet cisterns, by means of a double flush that can be adjusted according to whether the waste to be flushed includes faeces or not. It comprises a micro-dam, with adjustable capacity, intended to partially retain the contents of a toilet cistern, by means of a hole with a valve located at its bottom and a mechanism with external control to control the closed or open position of the valve with respect to its seat.

BRIEF SUMMARY OF THE INVENTION

The present invention solves the gargling-related deficiencies of existing techniques. The present invention provides a drain valve with an adjustable drainage speed and is configured to adjust a drainage speed, control noise, and prevent water splashing to meet various needs.

The problem is solved according to the features of claim 1.

In order to solve the above-mentioned technical problem, the present invention provides a drain valve with an adjustable drainage speed for the toilet cistern, where the drain valve comprises a water outlet, an adjustment mechanism. The drain valve further comprises at least one reversible plate, where the adjustment mechanism is configured to control an angle of the at least one reversible plate at the water outlet of the drain valve to adjust an opening width of the water outlet. The adjustment mechanism operates along a height direction of the drain valve to control a rotation angle of the at least one reversible plate in a vertical direction with respect to the drain valve. A water passage area of the water outlet is adjusted and adjustment of the drainage speed is achieved. According to the present invention, the adjustment mechanism operates along a height direction of the drain valve to control a rotation angle of the at least one reversible plate in a vertical direction with respect to the drain valve, a water passage area of the water outlet is adjusted and adjustment of the drainage speed is achieved.

In a preferred embodiment, the adjustment mechanism comprises a biasing component configured to move up and down. When the biasing component moves upward to bias the at least one reversible plate to rotate upward, the water passage area of the water outlet decreases and the drainage speed decreases. When the biasing component moves downward to allow the at least one reversible plate to rotate downward, the water passage area of the water outlet increases and the drainage speed increases.

In a preferred embodiment, within the drain valve, a horizontal support rod is arranged adjacent to the water outlet. The at least one reversible plate comprises two reversible plates, and the two reversible plates are respectively arranged on both sides of the pushing component and are rotatably connected to the horizontal support rod. Reference is made to the appended claims which claim embodiments of the drain valve with the at least one reversible plate or with the two reversible plates.

In a preferred embodiment, the adjustment mechanism comprises a threaded rod and the pushing component, the pushing component being a pushing block disposed at a first end of the threaded rod. Within the drain valve, an adjustment base is disposed adjacent to the water outlet. The adjustment base is disposed with an internal thread, the threaded rod is screwed into the adjustment base, the threaded rod is rotated to control the pushing block to move up and down, and the angle of rotation of the at least one reversible plate in the vertical direction is controlled.

In a preferred embodiment, at a position of an edge of the at least one reversible plate that is relative to the push block, at least one guide slope is disposed on a side of the at least one reversible plate opposite the push block, and the push block abuts the at least one guide slope to control the at least one reversible plate to achieve an initial upward rotation.

In a preferred embodiment, one side of the push block opposite the at least one guide slope is an inclined conical surface.

In a preferred embodiment, the adjustment mechanism comprises a rotating rod and the pushing component, the pushing component being a sleeve arranged with an external thread. The sleeve surrounds a first end of the rotating rod facing the at least one reversible plate, the sleeve rotates after a rotation of the rotating rod. Within the drain valve, an adjustment base is arranged adjacent to the water outlet, the adjustment base is arranged with an internal thread, the sleeve is screwed into the adjustment base. A second end of the rotating rod extends to an upper end of the drain valve. The rotating rod rotates to control the sleeve to move up and down, so that the angle of rotation of the at least one reversible plate in the vertical direction is controlled.

In a preferred embodiment, the adjustment base comprises a threaded base and a positioning base, the positioning base being arranged below the threaded base. The first end of the rotating rod is inserted into a through hole of the positioning base, and the sleeve is placed on a side of the positioning base facing the threaded base.

In a preferred embodiment, the first end of the rotating rod facing the at least one reversible plate is a rectangular rod, a cylindrical portion is disposed adjacent to one end of the rectangular rod. A through hole of the sleeve and an insertion hole of the positioning base are corresponding round holes of the central part, and the cylindrical portion is disposed at a position of the round central part of the insertion hole of the positioning base.

In a preferred embodiment, a thrust ring with an enlarged diameter is arranged at an upper end of the sleeve, the at least one reversible plate is arranged with at least one slot corresponding to the threaded base and the positioning base, a first end of the at least one slot is arranged with at least one abutting inclined surface corresponding to the thrust ring, and the thrust ring abuts the at least one abutting inclined surface such that an upward rotation of the at least one reversible plate is achieved.

In a preferred embodiment, the upper end of the drain valve is provided with a positioning member, the rotating rod is penetrated through a positioning hole of the positioning member, and the positioning hole prevents the rotating rod from oscillating.

In a preferred embodiment, the positioning member extends from an upper end of the rotating rod, and a knob is disposed at the upper end of the rotating rod.

The technical solution has the following advantages:

The drain valve with an adjustable drainage speed of the present invention uses a reversible plate to control the opening width of the water outlet of the drain valve, that is, to adjust the water passage area of the water outlet of the drain valve, and then control the drainage speed of the drain valve and finally adjust the drainage speed of the toilet. One application of the present invention does not increase the drainage speed by changing the width of a spray hole of the toilet, thereby preventing corresponding problems of large noise, water splashing and the like.

The present invention adjusts the drainage speed at a position of the water outlet of the drain valve, which effectively prevents the generation of noise, and an optimal size of the spray hole is adaptable to prevent the problem of water splashing during a washing procedure.

The drainage speed of the drain valve of the present invention is adjustable and can cooperate with different toilets and different water tanks to adjust based on a drainage volume, spray hole width and drainage speed of the drain valve to obtain a flushing effect required by the user.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic view of an implementation of the present invention,

Figure 2 illustrates a schematic view of Embodiment 1;

Figure 3 illustrates an exploded view of a portion of Embodiment 1 (drain valve body not shown);

Figure 4 illustrates a top view of Embodiment 1 when a reversible plate is arranged at a vertical angle (the drain valve body is not shown);

Figure 5 illustrates a sectional view of Figure 4 in a direction A-A;

Figure 6 illustrates a sectional view of Figure 4 in a B-B direction;

Figure 7 illustrates a top view of Embodiment 1 when the reversible plate is rotated to an upward position (the drain valve body is not shown);

Figure 8 illustrates a sectional view of Figure 7 in a C-C direction;

Figure 9 illustrates a schematic view of Embodiment 2;

Figure 10 illustrates an exploded view of Embodiment 2 (drain valve body not shown); Figure 11 illustrates a top view in Embodiment 2 when a reversible plate is arranged at a vertical angle (drain valve body not shown);

Figure 12 illustrates a sectional view of Figure 11 in a D-D direction;

Figure 13 illustrates a sectional view of Figure 11 in an E-E direction;

Figure 14 illustrates a top view of Embodiment 2 located when the reversible plate is rotated to an upward position (drain valve body not shown);

Figure 15 illustrates a sectional view of Figure 14 in a F-F direction; and

Figure 16 illustrates a graph showing the relationship between the adjustment component angle and the drainage rate.

Reference: 10 is a reversible plate (also called adjustable reversible plate), 11 is a guide slope, 12 is a groove, 13 is an abutting inclined surface, 14 is a hook, 20 is a threaded rod, 21 is a push block, 22 is a conical surface, 30 is a rotating rod, 301 is a rectangular rod, 302 is a cylindrical portion, 31 is a sleeve, 311 is a thrust ring, 312 is a through hole, 32 is a knob, 40 is an adjusting base, 41 is a threaded base, 42 is a positioning base, 421 is an insert hole, 43 is a connecting rod, 50 is a horizontal support rod, 60 is a positioning member, 61 is a positioning hole, 70 is a connecting base, and 71 is a drain valve body.

DETAILED DESCRIPTION OF THE ACHIEVEMENTS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In order to solve the problems of the existing technology (such as a large noise and water splashing) during a drainage speed adjustment procedure, the present invention provides a drain valve with an adjustable drainage speed (also called a drain valve), which is configured to adjust a drainage speed of the drain valve to control a discharge speed of a water flow of a toilet. The drain valve with the adjustable drainage speed is configured to improve a flushing effect, prevent noise, and effectively prevent a problem of water splashing.

Realization 1

A drain valve with an adjustable drainage speed of the present invention comprises an adjusting mechanism 100, the adjusting mechanism 100 is configured to control an angle of at least one adjustable reversible plate 10 (also referred to as at least one reversible plate) to adjust an opening width of the water outlet 72 at a position of a water outlet 72 of the drain valve, and an adjustment of a drainage speed is achieved. Furthermore, as shown in Figure 1, the present invention makes it possible to adjust a flow rate of a water spray ejected from a spray hole of a toilet at a position of the drain valve so that the spray hole of the toilet retains a normal size to control noise and prevent water splashing.

In the present invention, a water passage area of the water outlet 72 of the drain valve is changed by adjusting the angle of the at least one reversible plate 10, so that different drainage rates can be achieved by different water passage areas under the same drainage volume and the same water pressure. In the present invention, as shown in Fig. 2-8, the at least one reversible board 10 comprises a plate-like structure. When the at least one reversible plate 10 is arranged at a vertical angle with respect to a height direction of the drain valve, the water passage area of the water outlet 72 is larger. When the at least one reversible plate 10 is arranged at a horizontal angle with respect to the height direction of the drain valve, the water passage area of the water outlet 72 is the smallest. Accordingly, the adjusting mechanism 100 is operated along the height direction of the drain valve to control a rotation angle of the at least one reversible plate 10 in a vertical direction to adjust the water passage area of the water outlet 72, so that an adjustment of the drainage speed is achieved.

The adjusting mechanism 100 is operated along the height direction of the drain valve to push and release the at least one reversible plate 10, the adjusting mechanism 100 comprises a pushing component 200 configured to move up and down. When the drainage volume and the water pressure remain unchanged, the pushing component 200 moves upward, and the at least one reversible plate 10 is pushed upward, the water passage area of the water outlet 72 decreases, and the drainage speed decreases. When the pushing component 200 moves downward, the reversible 10 is turned downward due to a weight of the at least one reversible plate 10, the water passage area of the water outlet 72 increases, and the drainage speed increases.

In order to realize a vertical rotation of the at least one reversible plate 10, a horizontal support rod 50 is disposed on the drain valve adjacent to the water outlet 72, and the at least one reversible plate 10 is rotatably connected to the horizontal support rod 50. In theory, merely one of the at least one reversible plate 10 can affect the water passage area, and one or more of the at least one reversible plate 10 can also control the water passage area. In this embodiment, the at least one reversible plate comprises two reversible plates 10, the two reversible plates 10 are respectively placed on two sides of the pushing component 200, and the two reversible plates 10 are rotated synchronously under an action of the pushing component 200. When the two reversible plates 10 are at a vertical angle with respect to a height direction of the drain valve, the two reversible plates 10 are configured to be as close as possible, that is, a space between the two reversible plates 10 is small. Especially compared with a solution of three or more reversible boards 10, when there are a plurality of reversible boards 10, a space surrounded by the plurality of reversible boards is larger. When the plurality of reversible boards 10 are at a horizontal angle, there is still a large water passage area. When the plurality of reversible boards 10 are at a vertical angle, it occupies a large space. Therefore, when the two reversible plates 10 exist, an adjustment range for the water passage area is the widest, that is, an adjustment range of the drainage speed is the widest to allow a slower drainage speed and a faster drainage speed, and an adjustment efficiency is ensured. That is, the two reversible plates 10 are set to rotate at the same time to quickly adjust the drainage speed.

An upper edge of each of the two reversible plates 10 comprises two hooks 14, each of the two reversible plates 10 is rotatably connected to the horizontal support rod 50 through the two hooks 14. The two reversible plates 10 are opposite to each other and have the same structures. A first hook of the two hooks 14 is arranged at a first end of an upper edge of a corresponding one of the two reversible boards. A second hook of the two hooks 14 is arranged at a position of the upper edge of a corresponding one of the two reversible boards adjacent to a second end of the upper edge, the second hook is retracted inward by a certain distance, the certain distance that the retracted second hook 14 is greater than a defined length from the first hook 14 to an outer end of the upper edge of the corresponding one of the two reversible boards. Therefore, only one type of reversible plate 10 needs to be produced during one production process. When the two reversible plates 10 are assembled, the two reversible plates 10 on both sides are arranged symmetrically and rotatably, and two corresponding hooks 14 of the two reversible plates 10 on the same side are staggered and locked on the horizontal support rod 50 at the same time to define a rotatable connection. Furthermore, a defined distance between the upper edges of the two reversible plates 10 and the horizontal support rod 50 is extended due to the two hooks 14, the distance providing sufficient space for the two hooks 14 to prevent the two hooks 14 of the first second reversible plate 10 from contacting the second reversible plate 10 to restrict the rotation angle during rotation of the two reversible plates 10.

In this embodiment, the adjustment mechanism 100 comprises a threaded rod 20 and a pushing component 200. The pushing component 200 is a pushing block 21 disposed at one end of the threaded rod 20, and the threaded rod 20 and the pushing block 21 define an integrated structure that is similar to a bolt. Within the drain valve, an adjusting base 40 is disposed adjacent to a water outlet 72 of the drain valve. The adjusting base 40 is disposed with an internal thread. The threaded rod 20 is screwed into the adjusting base 40. The threaded rod 20 is rotated to control an upward movement and a downward movement of the pushing block 21, and the pushing block 21 is configured to push the two reversible plates 10 and release the two reversible plates 10 to control a rotation angle of the two reversible plates 10 in the vertical direction. The adjusting mechanism 100 is screwed from a bottom of the drain valve during an assembly procedure, and the adjusting mechanism 100 is operated from the bottom of the drain valve during an adjustment procedure. In order to facilitate rotation, an outline of the push block 21 is circular, and several protrusions are uniformly arranged on an outer wall of the push block 21 to increase a friction force and facilitate rotation by hand. It can also be adapted to open grooves on a surface of the push block 21 and rotate the push block 21 with a corresponding tool. For example, a cross groove is provided, and the push block 21 can be rotated with a cross screwdriver.

In order to simplify a structure of the drain valve, the horizontal support rod 50 and the adjusting base 40 may be an integrated structure, that is, the adjusting base 40 is arranged at a central position of the horizontal support rod 50, and the adjusting base 40 is positioned by the horizontal support rod 50, the two hooks 14 of each of the two reversible plates 10 are respectively arranged on both sides of the adjusting base 40 and are arranged on the horizontal support rod 50.

In order to obtain a maximum adjustable range, when the push block 21 is moved to a lower position, it should be arranged at a position which is out of a range of the two reversible plates 10 so that the two reversible plates 10 can be arranged at a vertical angle. When the push block 21 moves upward, in order to ensure that the push block 21 smoothly enters the interval of the two reversible plates 10 to smoothly achieve an angle adjustment without jamming with the two reversible plates 10. In this embodiment, at a position where the two reversible plates 10 are opposite the push block 21, a first side of each of the two reversible plates 10 comprises a guide slope 11. The guide slopes 11 provide space for an upward movement of the push block 21. The push block 21 gradually moves upward from a position not in contact with the two reversible plates 10, the push block 21 can prevent interference of the edges of the two reversible plates 10, the push block 21 first moves to contact the guide slopes 11 and push upward the two reversible plates 10, and an initial upward rotation of the two reversible plates 10 is achieved. The push block 21 continues to move upward from the guide slopes 11 to a flat plate portion of each of the two reversible plates 10, and a subsequent upward rotation of the two reversible plates 10 is achieved.

In this embodiment, when the guide slopes 11 of the two reversible plates 10 are arranged at a vertical angle to define a certain width, the push block 21 is arranged within a range of the certain width. The guide slopes 11 may be flat surfaces or curved surfaces, which may be obtained by thinning the two reversible boards 10, or may be obtained by bending them outward.

Corresponding to the guide slopes 11, the sides of the push block 21 opposite the guide slopes 11 are correspondingly inclined on the conical surface 22. Through a cooperation of the conical surface 22 and the guide slopes 11, the push block 21 can push the two reversible plates 10 to achieve the initial upward rotation more easily.

In order to facilitate assembly, in this embodiment, a connection base 70 is arranged at a first end of the water outlet 72 of the drain valve, the adjustment base 40, the horizontal support rod 50 and the connection base 70 are integrally formed. The adjustment mechanism 100 and the reversible plate 10 are first arranged on the adjustment base 40 and the horizontal support rod 50, then arranged on a drain valve body 71 through the connection base 70.

Realization 2

As shown in FIG. 9-15, in this embodiment, the adjustment mechanism 100 comprises a rotating rod 30 and a pushing component 200. The pushing component 200 comprises a sleeve 31 provided with an external thread. The sleeve 31 slideably surrounds at a first end of the rotating rod 30 facing the two reversible plates 10. The sleeve 31 rotates upon a rotation of the rotating rod 30. On the inner side of the drain valve, an adjusting base 40 is arranged adjacent a water outlet 72 of the drain valve. The adjusting base 40 is provided with an internal thread. The sleeve 31 is rotatably arranged on the adjusting base 40. The rotating rod 30 is rotated to control an upward movement and a downward movement of the sleeve 31, and a rotation angle of the two reversible plates 10 in the vertical direction is controlled. When it is necessary to adjust a height of the sleeve 31, the rotating rod 30 is rotated, and the sleeve 31 rotates following the rotation of the rotating rod 30. Since the sleeve 31 rotates synchronously with the rotating rod 30 and can slide on the rotating rod 30, when the sleeve 31 rotates, the rotating rod 30 can be moved up and down to push or release the two reversible plates 10.

A second edge of the rotating rod 30 extends to an upper end of the drain valve. In this embodiment, when a drain speed of the drain valve is adjusted, it can be operated from an upper end of the drain valve, and the operation is more convenient. The height of the drain valve is high, the adjusting base 40 and the sleeve 31 are arranged adjacent to a first end of the drain valve arranged with the water outlet 72, therefore, the rotating rod 30 needs a long length. The rotating rod 30 is simply supported by the adjusting base 40, therefore, the rotating rod 30 easily swings in a large width and it is not convenient to rotate it, as that would result in its breakage. In order to improve the stability of the rotating rod 30, a positioning member 60 is arranged at the upper end of the drain valve. The rotating rod 30 enters the positioning hole 61 of the positioning member 60, and the positioning hole 61 prevents the rotating rod 30 from swinging. In addition, the adjustment base 40 and the positioning member 60 are configured to restrict two ends of the rotating rod 30 in a horizontal direction, so that the rotation of the rotating rod 30 can be effectively prevented.

In order to further facilitate an adjustment operation, in this embodiment, a positioning member 60 extends from an upper end of the rotating rod 30, and a knob 32 is provided at the upper end of the rotating rod 30.

The adjusting base 40 comprises a threaded base 41 and a positioning base 42. The positioning base 42 is disposed below the threaded base 41. The positioning base 42 is configured to be connected to the threaded base 41 as a whole through a connecting rod 43. The first end of the rotating rod 30 is inserted into an insertion hole 421 of the positioning base 42, and the sleeve 31 is positioned on a first side of the positioning base 42 facing the threaded base 41. In this embodiment, an outer diameter of the sleeve 31 is larger than a diameter of the insertion hole 421, the insertion hole 31 cannot pass through the insertion hole 421 to prevent the sleeve 31 from passing through the insertion hole 421 due to excessive rotation of the rotating rod 30, and the sleeve 31 is separated from the rotating rod 30.

In this embodiment, a second end of the rotating rod 30 facing the two reversible plates 10 is a rectangular rod 301. The rectangular rod 301 comprises a cylindrical portion 302 adjacent to one end of the rectangular rod 301. A through hole 312 of the sleeve 31 and the insertion hole 421 of the positioning base 42 are corresponding round holes of the central part, the sleeve 31 is configured to pass through the rectangular rod 301 without obstacles, slide on the rotating rod 30, and rotate after rotation of the rotating rod 30. The cylindrical portion 302 is arranged at a round central part position of the insertion hole 421 of the positioning base 42, and the first end of the rotating rod 30 penetrates the positioning base 42 from the insertion hole 421. The rotating rod 30 is configured to be removed from the positioning base 42 only in a specific angle due to the cooperation of the rectangular rod 301 of the rotating rod 30, the cylindrical portion 302 and the insertion hole 421 of the positioning base 42, which ensures a stability of an installation of the rotating rod 30 and simplifies a disassembly operation without causing excessive difficulty and complexity.

In order to make a gap between the two reversible plates 10 as small as possible, each of the two reversible plates 10 is provided with a groove 12 corresponding to the threaded base 41 and the positioning base 42. When each of the two reversible plates 10 is at a vertical angle, the grooves 12 are arranged opposite to cover the threaded base 41 and the positioning base 42, and the plate-shaped structures of the two reversible plates 10 arranged on the two sides of the groove 12 are close to each other. In order to push the two reversible plates 10 more effectively, a thrust ring 311 with an enlarged diameter is provided at an upper end of the sleeve 31, and the two reversible plates 10 are respectively arranged with an inclined abutment surface 13 corresponding to the thrust ring 311. With the cooperation of the thrust ring 311 and the adjacent inclined surfaces 13, the two reversible plates 10 are configured to move upward or downward, and a principle is similar to that of Embodiment 1. In this embodiment, a first end of each of the slots 12 is provided with an inclined abutment surface 13 corresponding to the thrust ring 311, the thrust ring 311 abuts against the inclined surfaces 13 so that an upward rotation of the two reversible plates 10 is achieved.

When assembled, the sleeve 31 is first screwed onto the threaded base 41 in a downward direction, and the thrust ring 311 is configured to prevent the sleeve 31 from being unscrewed from the threaded base 41 due to over-tightening. Next, the rotating rod 30 is inserted from the top of the drain valve to pass through the positioning hole 61 of the positioning member 60, the through hole 312 provided in the threaded base 41 of the sleeve 31 and the insertion hole 421 of the positioning base 42, and then extends out of the positioning base 42. Furthermore, in order to facilitate an assembly of the sleeve 31, the adjustment base 40 and the horizontal support rod 50 are an integrated structure, the horizontal support rod 50 is a short rod extending laterally inward from each of both ends of the adjustment base 40. First, the two reversible plates 10 and the sleeve 31 are arranged on the adjustment base 40 and the horizontal support rod 50, and then the integrated structure of the adjustment base 40 and the horizontal support rod 50 are arranged on the drain valve. Furthermore, the integrated structure of the adjustment base 40 and the horizontal support rod 50 is configured to be arranged on the drain valve body 71 through the connection base 70.

The support structures of embodiment 2 are the same as those of embodiment 1.

A standard of Embodiment 1 and Embodiment 2 of the present invention are basically the same. As shown in Figure 16, when the adjusting component moves upward, an angle a of each of the two reversible boards in the vertical direction becomes larger, the water passage area becomes smaller, the drainage speed becomes slower, and a rate of the drainage speed decreases faster at first and then becomes slower.

It is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims.

Claims (12)

1. A drain valve with an adjustable drainage speed for the toilet cistern, wherein the drain valve comprises a water outlet (72), and an adjustment mechanism (100), wherein the drain valve further comprises at least one reversible plate (10), wherein the adjustment mechanism (100) is configured to control an angle of the at least one reversible plate (10) at the water outlet (72) of the drain valve to adjust an opening width of the water outlet (72), wherein the adjustment mechanism (100) operates along a height direction of the drain valve, characterized by that The adjustment mechanism (100) controls a rotation angle of the at least one reversible plate (10) in a vertical direction relative to the drain valve, so that a water passage area of the water outlet (72) is adjusted, and drainage speed adjustment is achieved. 2. The drain valve according to claim 1, characterized in that: The adjustment mechanism (100) comprises a biasing component (200) configured for upward and downward movement, where when the biasing component (200) moves upward to bias the at least one reversible plate (10) to rotate upward. the water passage area of the water outlet (72) decreases, and the drainage speed decreases, and when the thrust component (200) moves downward to allow the at least one reversible plate (10) to rotate downward, the water passage area of the water outlet (72) increases, and the drainage rate increases. 3. The drain valve according to claim 2, characterized in that: Within the drain valve, a horizontal support rod (50) is arranged adjacent to the water outlet (72), the at least one reversible plate (10) comprises two reversible plates (10), and The two reversible plates (10) are respectively arranged on both sides of the thrust component (200) and are rotatably connected to the horizontal support rod (50). 4. The drain valve according to claim 2 or 3, characterized in that: The adjustment mechanism (100) comprises a threaded rod (20) and the thrust component (200), the thrust component (200) is a thrust block (21) arranged at a first end of the threaded rod (20), Within the drain valve, an adjustment base (40) is arranged adjacent to the water outlet (72), the adjustment base (40) being arranged with an internal thread, The threaded rod (20) is screwed into the adjustment base (40), The threaded rod (20) is rotated to control the push block (21) to move up and down, and thus the angle of rotation of the at least one reversible plate (10) or the two reversible plates (10) in the vertical direction with respect to the drain valve is controlled. 5. The drain valve according to claim 4, characterized in that: at least one guide slope (11) is arranged at a position corresponding to the push block (21) on an edge of one side of the at least one reversible plate (10) or of the sides of the two reversible plates (10) facing the push block (21), and The push block (21) is supported on the at least one guide slope (11) to control the at least one reversible plate (10) or the two reversible plates (10) to achieve an initial upward rotation. 6. The drain valve according to claim 5, characterized in that: One side of the thrust block (21) facing the at least one guide slope (11) is a conical surface (22). 7. The drain valve according to claim 2 or 3, characterized in that: The adjustment mechanism (100) comprises a rotating rod (30) and the thrust component (200), the thrust component (200) is a sleeve (31) arranged with an external thread, a sleeve (31) surrounds the rotating rod (30) at a first end of the rotating rod (30) facing at least one reversible plate (10) or the two reversible plates (10), The sleeve (31) rotates after a rotation of the rotating rod (30), Inside the drain valve, an adjustment base (40) is arranged adjacent to the water outlet (72), the adjustment base (40) is arranged with an internal thread, The sleeve (31) is screwed to the adjustment base (40) a second end of the rotating rod (30) extends to an upper end of the drain valve, and The rotating rod (30) rotates to control the sleeve (31) to move up and down so as to control the rotation angle of the at least one reversible plate (10) or the two reversible plates (10) in the vertical direction with respect to the drain valve. 8. The drain valve according to claim 7, characterized in that: The adjustment base (40) comprises a threaded base (41) and a positioning base (42), The positioning base (42) is arranged below the threaded base (41), the first end of the rotating rod (30) is inserted into an insertion hole (421) of the positioning base (42), and The sleeve (31) is positioned on one side of the positioning base (42) facing the threaded base (41). 9. The drain valve according to claim 8, characterized in that: the first end of the rotating rod (30) facing at least one reversible plate (10) or the two reversible plates (10) is a rectangular rod (301), a cylindrical portion (302) is arranged adjacent to one end of the rectangular rod (301), a through hole (312) of the sleeve (31) and the insertion hole (421) of the positioning base (42) are corresponding round holes of the central part, and The cylindrical portion (302) is arranged at a round central part position of the insertion hole (421) of the positioning base (42). 10. The drain valve according to claim 8, characterized in that: a thrust ring (311) with an enlarged diameter is arranged at an upper end of the sleeve (31), the at least one reversible plate (10) or the two reversible plates (10) are arranged with at least one slot (12) corresponding to the threaded base (41) and the positioning base (42), a first end of the at least one slot (12) is arranged with at least one inclined stop surface (13) corresponding to the thrust ring (311), and The thrust ring (311) rests on the at least one inclined support surface (13) so that an upward rotation of the at least one reversible plate (10) is achieved. 11. The drain valve according to claim 7, characterized in that: the upper end of the drain valve is provided with a positioning member (60), the rotating rod (30) penetrates through a positioning hole (61) of the positioning member (60), and The positioning hole (61) prevents the rotating rod (30) from swinging. 12. The drain valve according to claim 11, characterized in that: The positioning member (60) extends from an upper end of the rotating rod (30), and a knob (32) is arranged at the upper end of the rotating rod (30).