JPH08247063A - Swing piston type compressor - Google Patents

Abstract

(57) [Summary] [Purpose] When using a swing guide bush 5 composed of two bushes 5A and 5B, the bush 5A on the low pressure side is ensured while ensuring smooth swing rotation of each bush 5A and 5B.
To improve performance and reliability. [Constitution] Bushings 5A, 5 of the swing guide bush 5
In B, the outer circumferential arc length of the low pressure side bush 5A facing the low pressure side inner circumferential surface of the holding hole 14 provided in the cylinder 1 is defined as the outer circumference of the high pressure side bush 5B facing the high pressure side inner circumferential surface of the holding hole 14. It is longer than the arc length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing piston compressor which is used in, for example, a refrigerating machine and is designed to revolve a roller in a cylinder chamber without revolving it to compress an intake fluid.

[0002]

2. Description of the Related Art Conventionally, a compressor is provided with a cylinder and a roller that is rotatably inserted into a crank pin in the cylinder chamber, and a blade extending radially outward is provided on the outer peripheral portion of the roller. A holding hole having a circular cross section facing the cylinder chamber is formed between the suction port and the discharge port provided in the cylinder, and the projecting tip side of the blade is freely received in the holding hole. A swinging guide bush having a receiving groove is provided, and the tip side of the blade is inserted into the receiving groove of this bush, and the low pressure chamber and the discharge port communicating the inside of the cylinder chamber with the suction port by the blade. A swing piston configured to perform a compression operation while being partitioned into a high pressure chamber communicating with the high pressure chamber to reduce the amount of fluid gas leaked from the high pressure chamber side to the low pressure chamber side to improve compression efficiency. Those of type, for example, JP-A 6-1 3
It is known from Japanese Patent No. 23271.

Further, the swing guide bush is composed of two left and right split bushes which are fitted into the circular holding holes, and each of these split bushes has a circular center portion of the holding hole on the outer surface side thereof. A circular columnar shape having the same outer diameter as the center and the same shape on the inner surface side having a flat surface continuous with the circular arc surface is formed. Then, each of the split bushes is inserted and fitted so that each of the arcuate surfaces thereof comes into surface contact with the inner peripheral surfaces of the high pressure and low pressure sides sandwiching the blade inside the holding hole, and between the flat surfaces of the split bushes. The blade is inserted into the receiving groove secured in.

With the above structure, when the roller is revolved around the crank pin, the split bushes are swung inside the holding hole while the blade is smoothly moved in the receiving groove between the split bushes. Can be moved back and forth.

[0005]

In the above compressor, when the fluid is compressed in the cylinder chamber, the pressure difference between the high pressure chamber and the low pressure chamber defined by the blade is very large. Since the high pressure on the side is applied to the blade, a large load is applied to the split bush on the side of the low pressure chamber via the blade. Therefore, when two split bushes of the same shape are used as in the conventional case, a large load is applied to the low-pressure side bush on one side without uniformly applying a load to each of these bushes. As a result, the blade is strongly pressed against the flat surface of the low pressure side bush, and the arc surface of the low pressure side bush is strongly pressed against the low pressure side inner peripheral surface of the holding hole, so that the low pressure side with respect to the blade and the holding hole. The low pressure side bush is apt to deteriorate due to frictional resistance accompanying the increase of the surface pressure of the bush, and there is a problem in terms of performance and reliability.

An object of the present invention is to use a swing guide bush composed of two split bushes, while ensuring smooth swing rotation of each split bush, while reducing deterioration of the low-pressure side bush to improve performance and reliability. To be able to raise it.

[0007]

In order to achieve the above object, according to the invention of claim 1, a roller 3 fitted to a crank pin 2 provided in a cylinder chamber 11 and rotating relative to the crank pin 2 is provided. A blade 4 which is connected to the outside of the roller 3 in a protruding manner and divides the inside of the cylinder chamber 11 into a low pressure chamber Y communicating with the suction port 12 and a high pressure chamber X communicating with the discharge port 13; In a swing piston compressor having a receiving groove 51 that receives the protruding tip side freely to move back and forth, and a swing guide bush 5 that is swingably held in a holding hole 14 provided in the cylinder chamber 11, The arc length of the outer peripheral surface of the low-pressure side bush 5A of the rocking guide bush 5 facing the inner peripheral surface is the high-pressure side bush of the rocking guide bush 5 facing the inner peripheral surface of the holding hole 14. It is made longer than the arc length of the outer peripheral surface of the shoe 5B.

According to the second aspect of the invention, the outer diameter of the outer peripheral surface of the low-pressure side bush 5A of the swing guide bush 5 and
The outer diameter of the outer peripheral surface of the high-pressure side bush 5B of the swing guide bush 5 is made different, and the centers of both outer shapes are made to coincide.

According to the third aspect of the invention, the center of the outer diameter of the outer peripheral surface of the low pressure side bush 5A of the swing guide bush 5 and the center of the outer diameter of the outer peripheral surface of the high pressure side bush 5B of the swing guide bush 5 are It is located on the center line of the blade 4.

According to the fourth aspect of the invention, the outer diameter of the outer peripheral surface of the low-pressure side bush 5A of the swing guide bush 5,
The outer diameter of the outer peripheral surface of the high-pressure side bush 5B of the swing guide bush 5 is the same, the centers of both outer shapes are aligned, and the blade 4 is positioned on the low-pressure side bush 5A side with the center line therebetween.

[0011]

According to the first aspect of the invention, when a large load is applied to the low pressure side bush 5A via the blade 4 by the high pressure on the high pressure chamber X side, the arc length of the outer peripheral surface of the high pressure side bush 5A is equal to that of the high pressure side bush. 5B is formed to be longer than the circular arc length of the outer peripheral surface, and the circular arc surface of the low pressure side bush 5A having a large circular arc length comes into contact with the low pressure side inner peripheral surface of the holding hole 14, that is, Since the contact area of the low-pressure side bush 5A with respect to the holding hole 14 is increased with respect to the high-pressure side bush 5B, this load is applied to the low-pressure side bush 5A, even though a large load is applied to the low-pressure side bush 5A. By distributing and receiving the large arc surface, the frictional resistance per unit area between the low pressure side bush 5A and the holding hole 14 can be reduced. Further, by making the arc surface of the low-pressure side bush 5A large, the inner flat surface of the low-pressure side bush 5A that comes into contact with the low-pressure side of the blade 4 also becomes large in area. The frictional resistance per unit area with the blade 4 can also be reduced. Therefore, the blade 4 and the holding hole 1
By reducing the frictional resistance of the low pressure side bush 5A with respect to No. 4, it is possible to enhance the proof stress of the low pressure side bush 5A and improve the performance and reliability.

According to the second aspect of the present invention, similarly to the case described above, the arc surface of the low pressure side bush 5A can be increased to improve the yield strength, while the low pressure side and high pressure side bushes 5A and 5B can be improved. Although the outer diameters of the bushes 5 are made different from each other and the outer shapes of the bushes 5A and 5B are made different, the outer diameters of the bushes 5A and 5B can be reliably rocked by the blades 4 by matching the centers of the outer shapes.

According to the third aspect of the present invention, since the center of the outer diameter of each of the bushes 5A and 5B is located on the center line of the blade 4, the blade 4 is sandwiched between the bushes 5A and 5B. The bushes 5A and 5B can be smoothly slidably rotated about the center on the center line of the blade 4 as a fulcrum, while being able to advance and retreat favorably in the central portion.

According to the fourth aspect of the invention, the outer diameters of the bushes 5A and 5B are formed in the same shape with their centers coincident with each other, and the centers of the bushes 5A and 5B are sandwiched by the center line of the blade 4 and the side of the low pressure bush 5A. Since the outer peripheral arc surface of the low pressure side bush 5A can be increased to improve the yield strength, the diameter of each inner peripheral surface of the holding hole 14 into which each bush 5A, 5B is inserted is the same. As for the diameter, the holding hole 14 can be a single hole, and the holding hole 14 can be easily formed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows only a main part of a swing piston type compressor, in which a drive shaft 2 is provided in a cylinder chamber 11 of a cylinder 1.
The crank pin 2 provided on the
The roller 3 is fitted to the above, and the blade 4 is integrally projectingly provided on the outer peripheral portion thereof in the radially outward direction, and between the suction port 12 and the discharge port 13 provided in the cylinder 1, A holding hole 14 that faces the cylinder chamber 11 is formed, and a swing guide bush 5 composed of split bushes 5A and 5B divided into two is inserted into the holding hole 14, and each of these bushes 5 is inserted.
By inserting the protruding tip side of the blade 4 freely into and out of the receiving groove 51 secured between A and 5B, the blade 4 and the low pressure chamber Y communicating the inside of the cylinder chamber 11 with the suction port 12 are formed. A high pressure chamber X communicating with the discharge port 13 is defined.

Then, as the crank pin 2 rotates, the roller 3 is revolved in the cylinder chamber 11 without rotating, so that the gas fluid sucked into the low pressure chamber Y is compressed and the high pressure chamber Y is compressed. The liquid is discharged from X through the discharge port 13 to the outside. In the figure, 6 is a discharge valve provided at the discharge port 13, and 60 is a valve retainer thereof.

In the above construction, however, the outer peripheral arcuate surface 5a of the low pressure side bush 5A of the swing guide bush 5 which is fitted into the low pressure chamber Y side of the holding hole 14 is
It is formed to be longer than the outer circumferential arc surface 5b of the high pressure side bush 5B inserted into the high pressure chamber X side of the holding hole 14.

Specifically, as shown in FIG. 2, the radius from the center O of the low pressure side bush 5A to the outer peripheral arc surface 5a is R1, and from the center O of the high pressure side bush 5B to the outer peripheral arc surface 5b. Let R2 be the radius of R1> R2
Thus, the outer peripheral arcuate surface 5a of the low pressure side bush 5A is formed to be larger than the outer peripheral arcuate surface 5b of the high pressure side bush 5B, and is contacted with the blade low pressure side surface of the low pressure side bush 5A. The flat surface 5c is made larger in area than the flat surface 5d that is in contact with the blade high-pressure side surface of the high-pressure side bush 5B.
Are formed into odd-shaped cylinders having different outer shapes.

The low pressure side bush 5 of the holding hole 14
The inner peripheral surface 14a into which A is inserted is the same as or slightly larger than the radius R1 of the bush 5A, and the inner peripheral surface 14b of the holding hole 14 into which the high-pressure side bush 5B is inserted is defined as this bush. Formed to be the same as or slightly larger than the radius R2 of 5B,
The bushes 5A and 5B are respectively attached to the inner peripheral surfaces 14a and 14b, and the bushes 5A and 5B are attached to the blade 4 respectively.
The respective centers O are fitted so as to be slidably rotated while slidingly advancing and retreating.

At this time, in the figure, each of the bushes 5 is
The center O of A and 5B is set so as to coincide with the side surface of the blade 4 on which the flat surface 5c of the low pressure side bush 5A is in contact, and the arc of each bush bush 5A and 5B is set with the center O as a fulcrum. The surfaces 5a and 5b and the inner peripheral surfaces 14a and 14b of the holding hole 14 are formed.

Further, each of the bushes 5A and 5B is shown in FIG.
As shown in, the center O is set so as to coincide with the high-pressure side surface of the blade 4 with which the flat surface 5d of the high-pressure side bush 5B is in contact, and the center O is set to the low-pressure side bush 5
The radius R3 to the outer peripheral circular arc surface 5a of A is set larger than the radius R4 to the outer peripheral circular arc surface 5b of the high-pressure side bush 5B, and the radius R3 is substantially the same as the radius R3 and R4. The inner peripheral surfaces 14a and 14b of the hole 14 may be formed, and the bushes 5A and 5B may be slidably rotated about the center O while being in sliding contact with the inner peripheral surfaces 14a and 14b.

Further, as shown in FIG. 4, each of the bushes 5 is
A and 5B are set at the center of the blade 4 in the width direction with their centers O coincident with each other, and the radius R5 from the center O to the outer circumferential arc surface 5a of the low-pressure side bush 5A is set to the radius R5 of the high-pressure side bush 5B. The inner peripheral surfaces 14a and 14b of the holding hole 14 are formed so as to be larger than the radius R6 up to the outer peripheral circular arc surface 5b and have substantially the same diameters as the respective radii R5 and R6. The bushes 5A and 5B may be swung about the center O as a fulcrum while slidingly contacting the peripheral surfaces 14a and 14b.

With the above construction, when a large load is applied to the low pressure side bush 5A via the blade 4 by the high pressure of the high pressure chamber X side during the compression operation of the compressor, the outer peripheral arc surface 5a thereof is formed. Is larger than the outer peripheral circular arc surface 5b of the high pressure side bush 5B, and the circular arc surface 5a of the low pressure side bush 5A comes into surface contact with the large diameter low pressure side inner peripheral surface 14a of the holding hole 14. Even though a large load is applied to the low pressure side bush 5A, the load is dispersed and received by the entire large arc surface 5a of the low pressure side bush 5A and the large diameter inner peripheral surface 14a of the holding hole 14, and these low pressures are received. The frictional resistance per unit area generated between the arcuate surface 5a of the side bush 5A and the inner peripheral surface 14a of the holding hole 14 can be reduced.

Further, the arc surface 5 of the low pressure side bush 5A.
By increasing a, the inner flat surface 5c of the low-pressure side bush 5A that contacts the low-pressure side of the blade 4 also has a large area, and therefore the unit between the flat surface 5c having this large area and the blade 4 is large. Friction resistance per area can also be reduced. Therefore, by reducing the frictional resistance of the low pressure side bush 5A with respect to the blade 4 and the holding hole 14,
It is possible to improve the yield strength of the low pressure side bush 5A and improve the performance and reliability. In addition, although the outer shapes of the low-pressure side and high-pressure side bushes 5A and 5B are made different from each other to make them different, the center O of both outer shapes is formed.
By making them coincide with each other, it is possible to ensure the reliable rocking rotation of the bushes 5A and 5B as the blade 4 advances and retracts.

Further, as shown in FIG. 4, each of the bushes 5 is
When the center O of A and 5B is positioned at the center of the blade 4 in the width direction, the blade 4 is moved to the respective bushes 5.
The bushes 5A, 5B can be smoothly slidably rotated about the center portion in the width direction of the blade 4 as a fulcrum, while the bushes 5A, 5B can be favorably advanced and retracted at the center position sandwiching A and 5B.

Further, as shown in FIG. 5, the outer peripheral arcuate surfaces 5a and 5b of the bushes 5A and 5B have their respective centers O.
Is formed in an arc shape having the same radius R7 with the fulcrum as a fulcrum, and the respective centers O are arranged so as to match the flat surface 5c of the low pressure side bush 5A on the low pressure side side surface of the blade 4 that is in contact with the flat surface 5c. Each inner peripheral surface 14 of the holding hole 14 has a diameter substantially equal to the radius R7 with the center O as a fulcrum.
Alternatively, a and 14b may be formed.

In doing so, each of the bushes 5A,
Since the outer peripheral arcuate surfaces 5a and 5b of 5B have the same radius R7 and the center O is eccentrically provided on the low pressure side surface of the blade 4, the outer peripheral arcuate surface 5a of the low pressure side bush 5A is The inner surface 14a, 14b of the holding hole 14 into which the bushes 5A, 5B are inserted can be increased while increasing the area of the flat surface 5c and improving the yield strength as described above. Can have the same diameter, and the holding hole 14 can be a single hole,
Therefore, the formation of the holding hole 14 becomes easy.

[0028]

As described above, according to the first aspect of the present invention, the arc length of the outer peripheral surface of the low pressure side bush 5A is formed longer than that of the high pressure side bush 5B. When a large load is applied to the low pressure side bush 5A via the blade 4 by the high pressure on the X side, the load is dispersed and received by the entire large arc surface of the low pressure side bush 5A, and the low pressure side bush 5A and the holding hole. 1
4, the frictional resistance per unit area can be reduced, and by making the arc surface of the low pressure side bush 5A large, the inner flat surface of the low pressure side bush 5A that contacts the low pressure side of the blade 4 Also, the friction resistance per unit area between the flat surface having the large area and the blade 4 can be reduced, and as a result, the friction resistance of the low pressure side bush 5A with respect to the blade 4 and the holding hole 14 can be reduced. Can be reduced, the yield strength of the low pressure side bush 5A can be increased, and the performance and reliability can be improved.

According to the second aspect of the present invention, similarly to the case described above, the bushes 5A, 5B have different shapes while the outer circumferential arc surface of the low pressure side bush 5A can be increased to improve the yield strength. Despite this, by ensuring that the centers of the two outer shapes coincide with each other, reliable rocking rotation of the bushes 5A, 5B by the blade 4 can be guaranteed.

According to the third aspect of the invention, since the center of the outer diameter of each of the bushes 5A, 5B is located on the center line of the blade 4, the blade 4 is sandwiched between the bushes 5A, 5B. The bushes 5A and 5B can be smoothly slidably rotated about the center on the center line of the blade 4 as a fulcrum, while being able to advance and retreat favorably at the center position.

According to the fourth aspect of the present invention, the outer diameters of the bushes 5A and 5B are formed in the same shape with their centers coincident with each other, and the centers are sandwiched by the center line of the blade 4 and the low pressure bush 5A side. Since the outer peripheral arc surface of the low pressure side bush 5A can be increased to improve the yield strength, the diameter of each inner peripheral surface of the holding hole 14 into which each bush 5A, 5B is inserted is the same. The holding hole 14 can be formed as a single hole, and the holding hole 14 can be easily formed.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a main part of a swing piston type compressor according to the present invention.

FIG. 2 is a partial plan view showing one embodiment.

FIG. 3 is a plan view showing another embodiment.

FIG. 4 is a plan view showing another embodiment of the present invention.

FIG. 5 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

 11 ... Cylinder chamber 12 ... Suction port 13 ... Discharge port 14 ... Holding hole 2 ... Crank pin 3 ... Roller 4 ... Blade 5 ... Swing guide bush 51 ... Receiving groove 5A ... … Low pressure side bush 5B …… High pressure side bush X ………… High pressure chamber Y ………… Low pressure chamber

Claims (4)

[Claims] 1. A roller (3) fitted to a crank pin (2) provided inside a cylinder chamber (11) and rotating relative to the crank pin (2), and a roller protruding outward from the roller (3). A blade (4) which is connected in a circular shape and divides the inside of the cylinder chamber (11) into a low pressure chamber (Y) communicating with the suction port (12) and a high pressure chamber (X) communicating with the discharge port (13); A swing guide bush (5) having a receiving groove (51) for freely advancing and retracting the protruding tip side of the blade (4) and swingably held in a holding hole (14) provided in the cylinder chamber (11). In the swing piston compressor, the arc length of the outer peripheral surface of the low-pressure side bush (5A) of the swing guide bush (5) facing the inner peripheral surface of the holding hole (14) is defined as the holding hole (14). The rocking guide bush facing the inner peripheral surface of the High pressure side bush (5)
A swing piston compressor characterized in that it is made longer than the arc length of the outer peripheral surface in B). 2. The outer diameter of the outer peripheral surface of the low pressure side bush (5A) of the swing guide bush (5) is different from the outer diameter of the outer peripheral surface of the high pressure side bush (5B) of the swing guide bush (5), and The swing piston type compressor according to claim 1, wherein the centers of both outer shapes are made to coincide with each other. 3. The center of the outer diameter of the outer peripheral surface of the low-pressure side bush (5A) of the swing guide bush (5) and the center of the outer diameter of the outer peripheral surface of the high-pressure side bush (5B) of the swing guide bush (5). Is located on the center line of the blade (4). 4. The outer diameter of the outer peripheral surface of the low pressure side bush (5A) of the swing guide bush (5) and the outer diameter of the outer peripheral surface of the high pressure side bush (5B) of the swing guide bush (5) are the same, The swing piston type compressor according to claim 1, wherein the centers of the two outer shapes are coincident with each other and are located on the low pressure side bush (5A) side with the center line of the blade (4) interposed therebetween.