JPH0710475U - Swash plate type compressor - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a swash plate compressor having a discharge valve that does not cause fatigue cracks in the discharge valve and that opens and closes smoothly. [Structure] An annular plate-shaped connecting portion 124a and a connecting portion 124
a valve body 124b that projects radially from a, and a valve body 12
4b and an arcuate chamfered portion 124c formed at the base of the housing 4b, and a swash plate type compression device including a discharge valve 124 fixed to the housing 103 by pressing the connecting portion 124a against the wall end of the cylindrical wall of the housing 103. In the machine
The arcuate chamfered portion 124c of the valve body 124b is formed so as to enter the inside of the wall end of the cylindrical wall of the housing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a swash plate compressor.

[0002]

[Prior art]

 A swash plate type variable displacement compressor having a conventional structure will be described with reference to FIGS. As shown in FIG. 5, the swash plate type variable displacement compressor includes a front housing 1 having a small-diameter cylindrical portion 1a and a large-diameter cylindrical portion 1b, a cylindrical center housing 2, and a bottomed cylindrical rear housing 3. And a housing composed of The center housing 2 is composed of half portions 2a and 2b. The front housing 1 and the center housing 2 are separated by a side plate 4, and the center housing 2 and the rear housing 3 are separated by a side plate 5. A plurality of cylindrical cylinder chambers 6 are formed in the center housing 2 at predetermined intervals in the circumferential direction. A shaft 9 rotatably supported by a bearing 7 held by the small-diameter cylindrical portion 1 a of the front housing 1 and a bearing 8 held by the center housing 2 extends in the center housing 2. The shaft 9 is rotationally driven by an engine (not shown) via an electromagnetic clutch (not shown). A power transmission unit 10 is formed at the end of the shaft 9 extending into the center housing 2. The power transmission unit 10 is provided with a slit 11 that is inclined with respect to the axis of the shaft 9. The pin 14 fixed to the input portion 13 of the disc-shaped swash plate 12 is engaged with the slit 11. As a result, the swash plate 12 is connected to the shaft 9 so as to be rotatable about the axis of the pin 14 and movable along the slit 11.

A piston 15 is reciprocally slidably disposed in the cylinder chamber 6. The pistons 15 sandwich the swash plate 12 and extend to both sides of the swash plate 12. A pair of hemispherical shoes 16 are arranged between the swash plate 12 and the piston 15 with the swash plate 12 interposed therebetween. The shoe 16 is slidable with respect to the swash plate 12 and also with respect to the piston 15. Suction chambers 17 and 18 are formed inside the front housing 1 and the rear housing 3. Discharge chambers 19 and 20 are formed radially outward of the suction chambers 17 and 18, respectively. The suction chamber 17 and the discharge chamber 19 are partitioned by the cylindrical inner wall 1a of the front housing 1, and the suction chamber 18 and the discharge chamber 20 are partitioned by the cylindrical inner wall 3a of the rear housing 3. Suction holes 21 are formed in the side plates 4 and 5 to connect the cylinder chamber 6 and the suction chambers 17 and 18. Further, the side plates 4 and 5 are formed with discharge holes 22 which connect the cylinder chamber 6 and the discharge chambers 19 and 20. A suction valve 23 is arranged on the cylinder chamber 6 side of the suction hole 21, and a discharge valve 24 is arranged on the discharge chambers 19 and 20 side of the discharge hole 22.

The structure of the discharge valve 24 disposed on the discharge chamber 20 side of the discharge hole 22 will be described with reference to FIGS. The discharge valve 24 includes an annular plate-shaped connecting portion 24a, a valve body 24b, which is circumferentially spaced apart from each other, and protrudes radially inward from the connecting portion 24a, the same number as the cylinder chambers 6, and a valve body 24b. It is composed of an arcuate chamfer 24c formed on the base of 24b. A valve retainer 25 is provided so as to overlap the discharge valve 24. The peripheral portion of the side plate 5, the connecting portion 24a of the discharge valve 24, and the end portion of the valve retainer 25 are clamped by the outer peripheral wall end of the half portion 2b of the center housing 2 and the outer peripheral wall end of the rear housing 3. Is fixed to the housing. The structure of the discharge valve 24 arranged on the discharge chamber 19 side of the discharge hole 22 is the same as that described above.

As shown in FIG. 5, in the center housings 2 a and 2 b, in addition to the cylinder chamber 6, a swash plate chamber 26 that stores the swash plate 12 and a low-temperature low-pressure refrigerant from the swash plate chamber 26 to the suction chambers 17 and 18 are provided. The suction side passages 27 and 28 for introducing the refrigerant are formed, and the discharge side passages 29 and 30 for discharging the high temperature and high pressure compressed refrigerant from the discharge chambers 19 and 20 to the outside are formed. The swash plate chamber 26 communicates with an evaporator of an air conditioner (not shown) through an intake port (not shown). The discharge-side passages 29 and 30 communicate with the condenser of an air conditioner (not shown) via the discharge ports 31 and 32. A connecting ball 33 is slidably fitted in a circular opening formed in the center of the swash plate 12. The connecting ball 33 is fixed to the slider 34. The slider 34 is connected to the drive piston 35. The drive piston 35 is arranged in the center of the rear housing 3. A pressure chamber 36 is formed inside the drive piston 35. The low pressure in the suction chamber 18 is introduced into the pressure chamber 36 via the low pressure introduction passage 37 and the output passage 38, and the high pressure in the discharge chamber 20 is introduced via the high pressure introduction passage 39 and the output passage 38. Pressure is introduced. The introduction pressure is switched and controlled by the switching valve 40. The switching valve 40 is driven by an electric signal from the controller 41.

The operation of the swash plate type variable displacement compressor configured as described above will be described. When an electromagnetic clutch (not shown) is connected and the rotational driving force of the engine is transmitted to the shaft 9, the shaft 9 and the swash plate 12 rotate. Since the swash plate 12 is inclined with respect to the axis of the shaft 9, the swash plate 12 makes a swinging motion as the shaft 9 rotates. The swing is transmitted to the piston 15 via the shoe 16, and the piston 15 reciprocates in the cylinder chamber 6. As the piston 15 reciprocates, the intake valve 23 opens during the intake stroke of the piston, and the low-temperature low-pressure refrigerant enters the intake chambers 17 and 18 through the intake port, the swash plate chamber 26, and the intake passages 27 and 28 (not shown). It is sucked and then sucked into the cylinder chamber 6 through the suction holes 21 from the suction chambers 17 and 18. During the compression stroke of the piston, the refrigerant is compressed as the volume of the cylinder chamber 6 decreases. When the refrigerant in the cylinder chamber 6 is compressed to a predetermined pressure or more, the valve body 24b of the discharge valve 24 is deformed out-of-plane to the discharge chamber side and the discharge valve 24 opens, and the discharge from the cylinder chamber 6 passes through the discharge hole 22. The refrigerant is discharged into the discharge chambers 19 and 20. The refrigerant discharged into the discharge chambers 19 and 20 is then discharged from the compressor through the discharge passages 29 and 30 and the discharge ports 31 and 32.

In the compressor having the above structure, the inclination angle of the swash plate 12 is controlled according to the discharge capacity required by the air conditioner. That is, the switching valve 40 is switched based on the electric signal from the controller 41, and thereby the inclination angle of the swash plate 12 is controlled. When the switching valve 40 connects the low pressure introduction passage 37 and the output passage 38 to each other, the pressure in the control pressure chamber 36 becomes the same as the low pressure in the suction chamber 18. In this case, the reaction force from the refrigerant applied to the pistons other than the piston 15 shown in FIG. 1 is transmitted to the drive piston 35 via the swash plate 12 and the slider 34, and the drive piston 35 is moved as shown in FIG. Displaces to the right. When the drive piston 35 is displaced rightward in the figure, the inclination of the swash plate 12 with respect to the shaft 9 becomes smaller. By reducing the inclination of the swash plate 12, the forward and backward stroke of the piston 15 is reduced, and the discharge amount of the compressor is reduced. When a large discharge amount is required for the compressor, the switching valve 40 switches the passage based on the electric signal from the controller 41. That is, the high pressure introduction passage 39 and the output passage 38 are communicated with each other. The high pressure in the discharge chamber 20 is introduced into the control pressure chamber 36, and the drive piston 35 is displaced leftward in the figure. The displacement of the drive piston 35 is transmitted to the swash plate 12 via the slider 34 and the connecting ball 33. The pin 14 moves in the slit 11 to increase the inclination angle of the swash plate 12 with respect to the shaft 9. As the tilt angle of the swash plate 12 increases, the reciprocating stroke of the piston 15 increases, and the discharge amount of the compressor increases.

[0008]

[Problems to be solved by the device]

 In the conventional swash plate compressor, when the valve body 24b including the arcuate chamfered portion 24c is out-of-plane deformed and the discharge valve 24 is opened, the shape of the valve body 24b and the shape of the valve body 24b are changed. There is a problem that stress concentration occurs at the boundary with the arcuate chamfered portion 24c, that is, at the portion A in FIG. 7, and fatigue cracks occur at the portion A. Further, since the outer peripheral wall end of the rear housing 3 has a cylindrical shape, the radial length of the valve main body 24b up to the fixed end, that is, the inner edge of the outer peripheral wall end of the rear housing 3 is the width of the valve main body 24b. The center is the longest and the sides are the shortest. Therefore, the distribution of the bending stress generated in the valve body 24b in the width direction is not uniform, and is maximum at both sides and minimum at the center. As a result, there has been a problem that the stress in the A portion is promoted, which in turn promotes the occurrence of fatigue cracks in the A portion. Further, since the arcuate chamfered portion 24c is formed at the base of the valve body 24b, there is a problem that the out-of-plane deformation of the valve body 24b is suppressed and the smooth opening and closing of the discharge valve 24 is hindered. The present invention has been made in view of the above problems, and an object of the present invention is to provide a swash plate compressor including a discharge valve that does not cause fatigue cracks in the discharge valve and that opens and closes smoothly.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, an annular plate-shaped connecting portion, a valve body protruding in the radial direction from the connecting portion, and an arcuate chamfered portion formed at the base of the valve body are provided. In a swash plate compressor having a discharge valve fixed to the housing by a connecting part being pressed against the wall end of the cylindrical wall of the housing, the arc-shaped chamfer of the valve body is There is provided a swash plate compressor characterized in that it is formed so as to enter the inside of the wall end of the. The present invention further includes an annular plate-shaped connecting portion, a valve body that projects radially from the connecting portion, and an arcuate chamfer formed at the base of the valve body, the connecting portion having a housing. In a swash plate compressor equipped with a discharge valve that is fixed to the housing by being pressed against the wall end of the cylindrical wall of the housing, the wall end of the cylindrical wall of the housing has a portion in contact with the valve body in the radial direction on the valve body side. Provided is a swash plate type compressor, which is formed in a straight line shape that is bulged out and is orthogonal to the extending direction of the valve body.

[0010]

[Action]

 In the present invention, the arcuate chamfered portion of the valve body is formed so as to enter the inside of the wall end of the cylindrical wall of the housing. Therefore, there is no shape change portion that causes stress concentration in the portion that causes the out-of-plane deformation when the discharge valve opens, that is, the portion of the valve body that is outside the wall end of the cylindrical wall of the housing. Therefore, there is no risk of fatigue cracks occurring in the valve body. Further, since the arcuate chamfered portion is not formed in the portion that causes the out-of-plane deformation of the valve body, the out-of-plane deformation of the valve body is not suppressed. Therefore, the discharge valve opens and closes smoothly. Further, in the present invention, the wall end of the cylindrical wall of the housing is formed in a linear shape in which a portion in contact with the valve body is radially extended toward the valve body side and is orthogonal to the extending direction of the valve body. Has been done. Therefore, the radial length of the valve body up to the fixed end, that is, the edge of the wall end of the cylindrical wall of the housing, is equal in the central portion and both side portions of the width of the valve body. Therefore, the distribution of bending stress generated in the valve body in the width direction is uniform. As a result, the increase in stress in the shape-changed portion of the valve body is relieved, and the occurrence of fatigue cracks in that portion is suppressed. Moreover, since only a part of the chamfer having an arc shape is present in the portion where the out-of-plane deformation of the valve body occurs, the out-of-plane deformation of the valve body is not so suppressed. Therefore, the discharge valve opens and closes smoothly.

[0011]

【Example】

 A swash plate type variable displacement compressor according to a first embodiment of the present invention will be described with reference to FIGS. In the present compressor, the discharge valve 124 has the same number of valve bodies as the cylinder chambers and the annular plate-shaped connecting portion 124a, which projects radially inward from the connecting portion 124a at intervals in the circumferential direction. 124b and an arcuate chamfered portion 124c formed at the base of the valve body 124b. A valve retainer 125 is provided so as to overlap the discharge valve 124. The peripheral portion of the side plate 105, the connecting portion 124a of the discharge valve 124, and the end portion of the valve retainer 125 are sandwiched by the outer peripheral wall end of the center housing half portion 102b and the outer peripheral wall end of the rear housing 103. Fixed to the housing. The arcuate chamfered portion 124c of the discharge valve 124 is formed radially outward of the outer peripheral wall end of the center housing half portion 102b and the inner edge of the outer peripheral wall end of the rear housing 103. In other words, the arcuate chamfered portion 124c of the discharge valve 124 is formed so as to enter inside the outer peripheral wall end of the center housing half portion 102b and the outer peripheral wall end of the rear housing 103. Except for the above, the structure of this compressor is the same as the conventional swash plate type variable displacement compressor.

In the present embodiment, the portion of the discharge valve 124 that undergoes out-of-plane deformation when the valve is opened, that is, the outer peripheral wall end of the center housing half portion 102 b and the outer peripheral wall end of the rear housing 103 of the valve body 124 b. There is a shape-changing portion that causes stress concentration in a portion radially inward of the inner edge, in other words, a portion outside the outer peripheral wall end of the center housing half portion 102b and the outer peripheral wall end of the rear housing 103. do not do. Therefore, there is no risk of fatigue cracks occurring in the valve body 124b. Further, since the arcuate chamfered portion 124c is not formed in the portion of the valve body 124b that causes the out-of-plane deformation, the out-of-plane deformation of the valve body 124b is not suppressed. Therefore, the discharge valve 124 opens and closes smoothly.

A swash plate type variable displacement compressor according to a second embodiment of the present invention will be described with reference to FIGS. In the present compressor, the discharge valve 224 has the same number of valve bodies as the cylinder chambers and the annular plate-shaped connecting portion 224a that protrudes radially inward from the connecting portion 224a at intervals in the circumferential direction. 224b and an arcuate chamfer 224c formed at the base of the valve body 224b. A valve retainer 225 is provided so as to overlap the discharge valve 224. The peripheral portion of the side plate 205, the connecting portion 224a of the discharge valve 224, and the end portion of the valve retainer 225 are clamped by the outer peripheral wall end of the center housing half portion 202b and the outer peripheral wall end of the rear housing 203. Fixed to the housing. The inner edge of the outer peripheral wall end of the half portion 202b of the center housing and the inner peripheral edge of the outer peripheral wall end of the rear housing 203 are such that the portion in contact with the valve body 224b of the discharge valve 224 projects radially inward, that is, the valve body 224b in the radial direction. It is formed in a straight line that extends to the side and that is orthogonal to the extending direction of the valve body 224b. Except for the above, the structure of this compressor is the same as the conventional swash plate type variable displacement compressor.

In the present embodiment, the radial length of the valve body 224b up to the fixed end, that is, the outer peripheral wall end of the center housing half portion 202b and the inner edge of the outer peripheral wall end of the rear housing 203, is the radial length of the valve main body 224b. Equal in width center and both sides. Therefore, the distribution of the bending stress generated in the base of the valve body 224b in the width direction is uniform. As a result, the stress increase in the shape change portion AA of the base portion of the valve body 224b is relieved, and the occurrence of fatigue cracks in the portion is suppressed. In addition, since only a part of the chamfered portion 224c having an arc shape is present in the portion of the valve body 224b that causes the out-of-plane deformation, the out-of-plane deformation of the valve body 224b is not significantly suppressed. Therefore, the discharge valve 224 opens and closes smoothly. Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the first embodiment and the second embodiment may be combined. As a result, fatigue cracks in the valve body base can be suppressed more effectively. In the present invention, the connecting portion is pressed against the wall end of the cylindrical inner wall of the housing that separates the suction chamber and the discharge chamber, and more specifically, the wall end of the cylindrical inner wall of the housing that separates the suction chamber and the discharge chamber from each other. Since the connecting portion is sandwiched by the side plate, it can be applied to a swash plate compressor having a discharge valve fixed to the housing. In this case, the valve body will protrude radially outward from the connecting portion, and the arcuate chamfer formed on the base of the valve body will be larger than the outer edge of the wall end of the cylindrical inner wall of the housing. It is formed inward in the radial direction, in other words, it is formed so as to enter the inside of the wall end of the cylindrical inner wall of the housing, and the portion of the outer edge of the wall end of the cylindrical inner wall of the housing that contacts the valve body is outward in the radial direction. That is, it is formed in a straight line that is orthogonal to the extending direction of the valve main body, that is, it is radially extended to the valve main body side. The present invention can also be applied to a swash plate type fixed capacity compressor.

[0015]

【effect】

 As described above, in the present invention, the arcuate chamfered portion of the valve body is formed so as to enter the inside of the wall end of the cylindrical wall of the housing. Therefore, there is no shape-changing portion that causes stress concentration in the portion that causes the out-of-plane deformation when the discharge valve opens, that is, the portion of the valve body that is outside the wall end of the cylindrical wall of the housing. Therefore, there is no risk of fatigue cracks occurring in the valve body. Further, since the arcuate chamfered portion is not formed in the portion where the out-of-plane deformation of the valve body occurs, the out-of-plane deformation of the valve body is not suppressed. Therefore, the discharge valve opens and closes smoothly. Further, in the present invention, the wall end of the cylindrical wall of the housing is formed in a linear shape in which a portion in contact with the valve body is radially extended toward the valve body side and is orthogonal to the extending direction of the valve body. Has been done. Therefore, the radial length of the valve body up to the fixed end, that is, the edge of the wall end of the cylindrical wall of the housing, is equal in the central portion and both side portions of the width of the valve body. Therefore, the distribution of bending stress generated in the valve body in the width direction is uniform. As a result, the increase in stress in the shape-changed portion of the valve body is relieved, and the occurrence of fatigue cracks in that portion is suppressed. Moreover, since only a part of the chamfer having an arc shape is present in the portion where the out-of-plane deformation of the valve body occurs, the out-of-plane deformation of the valve body is not so suppressed. Therefore, the discharge valve opens and closes smoothly. Therefore, the present invention provides a swash plate compressor having a discharge valve that is smoothly opened and closed without causing fatigue cracks in the discharge valve.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a discharge valve included in a swash plate type variable displacement compressor according to a first embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a sectional view of a discharge valve included in a swash plate type variable displacement compressor according to a second embodiment of the present invention.

4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional view showing an entire structure of a conventional swash plate type variable displacement compressor.

FIG. 6 is a cross-sectional view of a discharge valve included in a swash plate type variable displacement compressor having a conventional structure.

7 is a VII-VII arrow view of FIG. 6;

[Explanation of symbols]

 2b Half part of center housing 3 Rear housing 5 Side plate 22 Discharge hole 24 Discharge valve 24a Connection part 24b Valve body 24c Arc chamfer 25 Valve retainer 102b Half part of center housing 103 Rear housing 105 Side plate 124 Discharge valve 124a Connection part 124b Valve body 124c Arc-shaped chamfered part 125 Valve retainer 202b Center housing half part 203 Rear housing 205 Side plate 224 Discharge valve 224a Connection part 224b Valve body 224c Arc-shaped chamfered part 225 Valve retainer

Claims (5)

[Scope of utility model registration request] 1. A cylinder of a housing, comprising an annular plate-shaped connecting portion, a valve body protruding in a radial direction from the connecting portion, and an arcuate chamfer formed on a base portion of the valve body. In a swash plate compressor including a discharge valve fixed to the housing by being pressed against the wall end of the cylindrical wall, the arcuate chamfered portion of the valve body is inserted inside the wall end of the cylindrical wall of the housing. A swash plate compressor characterized by being formed. 2. A cylinder of a housing, comprising an annular plate-shaped connecting portion, a valve body protruding in a radial direction from the connecting portion, and an arcuate chamfer formed on a base portion of the valve body. In a swash plate compressor having a discharge valve fixed to the housing by being pressed against the wall end of the cylindrical wall, the wall end of the cylindrical wall of the housing has a portion in contact with the valve body that projects radially toward the valve body. And a swash plate compressor which is formed in a linear shape orthogonal to the extending direction of the valve body. 3. A cylinder of a housing, which comprises an annular plate-like connecting portion, a valve body protruding in a radial direction from the connecting portion, and an arcuate chamfer formed on a base portion of the valve body. In a swash plate compressor having a discharge valve fixed to the housing by being pressed against the wall end of the cylindrical wall, the wall end of the cylindrical wall of the housing has a portion in contact with the valve body that projects radially toward the valve body. And is formed in a straight line orthogonal to the extending direction of the valve body, and the arcuate chamfered portion of the valve body is formed so as to enter the inside of the wall end of the cylindrical wall of the housing. A swash plate type compressor. 4. The cylindrical wall of the housing is an outer peripheral wall of the housing, and the valve main body projects radially inward from the connecting portion, according to any one of claims 1 to 3. Swash plate type compressor. 5. The cylindrical wall of the housing is a cylindrical inner wall of the housing that divides the suction chamber and the discharge chamber, and the valve body projects radially outward from the connecting portion. The swash plate compressor according to any one of 3 above.