WO1997037132A1

WO1997037132A1 - Rotary pump

Info

Publication number: WO1997037132A1
Application number: PCT/CN1997/000024
Authority: WO
Inventors: Xiaoying Yun
Original assignee: Xiaoying Yun
Priority date: 1996-03-29
Filing date: 1997-03-28
Publication date: 1997-10-09
Also published as: AU2148397A; CN1148671A

Abstract

The invention relates to rotary pump comprising a cylindrical cylinder block, a cam rotor accommodated in the cylinder block and a separating plate. The projected portion of the rotor, having the major diameter, is in seal contact with the inner wall of the cylinder block. The separating plate is pivoted on an axially extended supporting shaft in the cylinder block. The diametral outer and inner ends of the separating plate are respectively in seal contact with the inner wall of the cylinder block and the outer wall of the rotor. An intake port and an outlet port are respectively disposed on the opposite sides of the separating plate. The cylinder block is divided into an intaking chamber and an exhausting chamber by the separating plate and the major diameter projection of the cam rotor.

Description

Rotor pump TECHNICAL FIELD

The present invention relates to a rotor pump. BACKGROUND

Traditional pumps are limited by existing sealing methods and have many parts and complicated structures. Therefore, the manufacturing cost is high, and the reliability is poor and easy to damage. The traditional sealing methods have poor sealing performance, which inevitably causes leakage. And the sealing performance is further deteriorated after long-term use, which affects the normal use of the pump, and the purpose of the invention

The object of the present invention is to provide a rotor pump, which has a simple structure and a reliable seal.

In order to achieve the above object, the rotor pump provided by the present invention includes a cylindrical cylinder body, front and rear end covers fitted on the front and rear end faces of the cylinder body, a rotor installed in the cylinder body, and a rotor mounted on the rotor body together with it. The rotating main shaft is an oil suction port and an oil discharge port respectively communicating with the oil suction chamber and the oil discharge chamber. An axially extending recess is formed on the inner wall of the syringe, and an axially extending partition plate passes through an axially extending support shaft. It is pivotably fitted in the recess, and the radially outer end and the radially inner end of the partition plate block are in sealing contact with the inner wall of the cylinder and the rotor, respectively. The rotor is a cam rotor, and the arc diameter of the protruding portion of the rotor having the largest radius is approximately the same as the inner diameter of the cylinder, so as to form an axially extending sealing band. The oil suction port and the oil discharge port are respectively located in the Separate the sides of the partition block.

According to one aspect of the present invention, each sealing surface of the partition plate in contact with the inner wall of the cylinder and the cam rotor is provided with a honeycomb semi-circular pit to achieve sealing.

According to another aspect of the present invention, the sealing band of the cam rotor is provided with a honeycomb semi-circular pit to achieve sealing. Beneficial effect

Since the rotor pump of the present invention adopts the above structure, the structure is simple and easy to manufacture, and because the sealing surface adopts a honeycomb sealing structure, not only the sealing structure is simplified, but also a good denseness can be achieved. Seal.

The present invention is further described in detail with reference to the accompanying drawings and embodiments, in which:

1 is a cross-sectional view of an embodiment of a rotor pump of the present invention;

Figure 2 is a longitudinal sectional view of the rotor pump shown in Figure 1. A preferred embodiment of the invention

As shown in FIGS. 1 and 2, the rotor pump of the present invention includes a cylindrical cylinder shape 1, a concave portion extending in the axial direction is formed on the inner wall of the cylinder body 1, and an axially extending partition plate 3 is fitted in the concave portion. The two axial ends of the partition plate 3 are provided with short shafts 5, and each of the short shafts 5 is fitted in a sleeve or bearing on the front and rear end covers, so that the partition plate 3 can swing around the shaft 5, and the radial direction of the partition plate 3 The outer end is in sealing contact with the inner wall of the cylinder. The cylinder wall on both sides of the partition plate is provided with an oil suction port 9 and an oil discharge port 10.

A cam rotor 2 is mounted in the inner cavity of the cylinder. The rotor 2 is supported on the main shaft 4 and is positioned circumferentially by the key 6. The main shaft 4 is supported by bearings 8 installed on the front and rear end covers 7. The rotor has the largest radius of the convex The exit is a circular arc surface whose diameter is approximately the same as the inner diameter of the cylinder block 1. The 1¾ arc surface forms an axially extending sealing band. A slidable gap is formed between the circular arc surface and the diameter surface of the cylinder body. The radially inner end of the partition plate 3 abuts against the cam rotor 2, and a sliding seal contact is formed between them. As shown in FIG. 1, the inner cavity of the cylinder is protruded with the largest radius by the partition plate 3 and the cam rotor 2. Partially separated into the oil suction chamber and the oil discharge chamber.

The operation of the rotor pump of this embodiment is described below with reference to the drawings.

As shown in FIG. 1, when the rotor 2 is rotated in the direction indicated by the arrow under the driving of the main shaft 4, a negative pressure is formed in the oil suction chamber, so that the gas or liquid passes through the oil suction ¾ × cylinder communicating with the oil suction chamber, and at the same time, the The gas or liquid in the oil chamber is discharged through the oil discharge port 10 communicating with the oil discharge chamber under the protrusion of the rotor 2, and the partition plate 3 abuts against the rotor 2 under the fluid pressure difference between the oil suction chamber and the oil discharge chamber When the convex part of the rotor comes into contact with the partition plate 3, the convex part of the rotor pushes up the partition plate 3, and after the rotor convex part slides over the partition plate 3, it forms a negative in the oil suction chamber. The separation plate is adsorbed on the arc surface of the rotor by pressure to achieve separation and sealing.

In order to ensure the normal operation of the rotor pump, each sealing part must achieve a good seal. To this end, the present invention uses a so-called honeycomb sealing structure, that is, formed on at least one of two sealing surfaces with a reasonable gap. There are honeycomb semi-circular small pits, under the effect of fluid pressure or when two When relative motion occurs on the sealing surface, the fluid stored in the small pits rotates at a certain speed, so that high-speed vortices are formed in the small pits to block the leakage of the fluid, thereby achieving sealing.

In the rotor pump of this embodiment of the present invention, honeycomb-shaped semi-circular pits are formed on each of the sealing surfaces of the partition plate 3 that are in contact with the inner wall of the cylinder and the cam rotor, respectively. In addition, the cam rotor is in contact with the inner wall of the cylinder A small honeycomb semi-circular pit is also formed on the sealing surface to achieve a good seal. Experiments show that the honeycomb sealing structure can be used to achieve no leakage when the speed reaches 500 revolutions per minute.

The seal between the rotor and the end cover may also adopt the honeycomb seal structure, that is, a honeycomb semi-circular small recess is formed on at least one of the end surface of the rotor and the inner surface of the end cover to improve the rotor end surface. Sealing effect.

In addition, a honeycomb semi-circular pit can be formed on the protruding portion of the rotor in the direction of rotation to generate large air or liquid disturbances during operation, so that a stronger negative pressure is formed on the side of the suction port of the partition plate. In order to ensure the correct isolation of the separation plate.

The present invention has been described above with reference to the accompanying drawings and embodiments, but those skilled in the art should understand that the above embodiments are merely illustrative and not restrictive, and the above may be described without departing from the spirit and scope of the present invention. The embodiment makes various improvements. The above sealing parts can also use other sealing methods, for example, the seal between the cam rotor and the inner wall of the cylinder can use an axially slotted labyrinth seal instead of a honeycomb seal structure.

Claims

-A- Claim

A rotor pump comprising a cylindrical cylinder body, front and rear end covers fitted on the front and rear end faces of the cylinder body, a rotor installed in the cylinder body, and a main shaft, and the rotor is installed on the main shaft and can follow the main shaft. Rotate together, the oil suction port and oil discharge port which communicate with the oil suction chamber and the oil discharge chamber, respectively.

It is characterized in that a concave portion extending in the axial direction is formed on the inner wall of the cylinder body, an axially extending partition plate is pivotably fitted in the M portion through an axially extending support shaft, and the partition plate is divided into The radial outer end is in sealing contact with the inner wall of the cylinder, and its radial inner end is in sealing contact with the rotor.

The rotor is a cam rotor, and the arc diameter of the protruding portion of the rotor having the largest radius is substantially the same as the inner diameter of the cylinder to form an axially extending sealing band.

The oil suction port and the oil discharge port are respectively located on both sides of the partition plate.

2. The rotor pump according to claim 1,

It is characterized in that each sealing surface of the partition plate in contact with the inner wall of the cylinder and the cam rotor is provided with a honeycomb semi-circular pit to achieve sealing.

3. The rotor pump according to claim 2,

It is characterized in that the sealing band of the cam rotor is provided with a honeycomb semi-circular pit to achieve sealing.

4. The rotor pump according to claim 2,

It is characterized in that the seal band of the cam rotor adopts a labyrinth seal structure.

5. A rotor pump according to any preceding claim,

It is characterized in that honeycomb semi-circular pits are arranged on the front and rear end surfaces of the cam rotor to improve the sealing effect.

6. The rotor pump according to claim 5,

It is characterized in that a honeycomb semi-circular pit is arranged on the inner end surface of the front and rear end covers opposite to the rotor to improve the sealing effect.