JP2005105975A - Valve structure of compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve structure of a compressor capable of reducing suction pulsation since an intake valve is moved to an open position even if a pressure difference between a cylinder bore and an intake chamber is small without increasing the diameter of an intake hole. <P>SOLUTION: This valve structure of a compressor comprises a valve plate 12 in which the intake hole 20 allowing the cylinder bore 2 to communicate with the intake chamber 7 is formed and a flexible plate-like intake valve 13 installed on the cylinder bore 2 side of the valve plate 12 and capable of opening the intake hole 20. The intake valve 13 is opened and closed by the pressure difference between the cylinder bore 2 and the suction chamber 7 by the reciprocating motion of a piston. The intake valve 13 further comprises an intake valve body part, an intake hole and an opposite valve part 26 disposed at a position opposed to a valve seat 23 at the opening edge of the intake hole 20, and an arm valve part 27 connecting the intake valve body part 25 to the opposite valve part 26. A pressure receiving groove 28 formed in the cylinder bore 2 side along the arm valve part 27 and communicating with the intake hole 20 is formed in the valve plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve structure of a compressor used for compressing refrigerant gas in a refrigeration cycle such as a vehicle air conditioner.

  As a compressor used for compressing refrigerant gas in a refrigeration cycle of a vehicle air conditioner, a compressor disclosed in Patent Document 1 has been proposed. In this compressor, a crank chamber is provided on the front end side of a cylinder block formed with a plurality of cylinder bores, a suction chamber and a discharge chamber are provided on the rear end side, and a valve is provided between the cylinder bore and the suction chamber and the discharge chamber. The body is provided. In addition, the valve body is provided on the cylinder bore side of the valve plate in which a suction hole that communicates each cylinder bore and the suction chamber and a discharge hole that communicates each cylinder bore and the discharge chamber is formed. A so-called reed valve type suction valve that opens and closes the suction hole and a so-called reed valve type discharge valve that is provided on the discharge chamber side of the valve plate and opens and closes the discharge hole by bending deformation.

Then, the piston accommodated in each cylinder bore reciprocates using the rotation of the drive shaft supported in the crank chamber, and the suction valve opens when the pressure of the cylinder bore becomes smaller than the suction chamber due to the reciprocation of the piston. When the refrigerant gas is sucked into the cylinder bores from the suction chamber through the suction holes and the pressure of the cylinder bore becomes larger than the suction chamber due to the reciprocating movement of the piston, the suction valve is closed and the discharge valve is opened. Then, the refrigerant gas is compressed and discharged from each cylinder bore through the discharge hole to the discharge chamber. The compressor sends out the compressed refrigerant gas by repeating this operation.
JP-A-9-280168

By the way, it is desirable that the suction valve is changed from the closed position to the open position by a small differential pressure between the cylinder bore and the suction chamber in order to reduce suction pulsation. Here, it is conceivable to increase the diameter of the suction hole of the valve plate, but it cannot be changed simply because of the overall layout of the valve body.

  Accordingly, an object of the present invention is to provide a valve structure of a compressor that can reduce suction pulsation by shifting the suction valve to an open position even when the differential pressure between the cylinder bore and the suction chamber is small without increasing the diameter of the suction hole. To do.

  According to a first aspect of the present invention, a valve body is provided between a cylinder bore in which a piston is accommodated, a suction chamber, and a discharge chamber, and the valve body communicates the cylinder bore and the suction chamber with the cylinder bore and the cylinder bore. A reciprocating motion of the piston, comprising: a valve plate formed with a discharge hole communicating with the discharge chamber; and a flexible plate-like suction valve provided on the cylinder bore side of the valve plate for opening and closing the suction hole. The compressor has a valve structure in which the suction valve opens and closes due to a differential pressure between the cylinder bore and the suction chamber. The suction valve includes a suction valve main body portion that is in close contact with the valve plate, the suction hole, and the suction hole. A counter valve portion disposed at a position facing the valve seat at the opening edge of the hole, the suction valve main body portion, and the counter valve portion are connected, and are deformed and bent by a differential pressure between the cylinder bore and the suction chamber. And an arm valve part that deforms the counter valve part to deform the counter valve part, and the valve plate receives a pressure that increases a pressure receiving area of the refrigerant gas in the suction chamber with respect to the counter valve part and the arm valve part. An area increasing portion is provided.

  The invention of claim 2 is the valve structure of the compressor according to claim 1, wherein the pressure receiving area increasing portion is provided on the cylinder bore side along the arm valve portion, and is for pressure reception communicating with the suction hole. It is a groove.

  The invention according to claim 3 is the valve structure of the compressor according to claim 1, wherein the pressure receiving area increasing portion is provided at a position facing the arm valve portion, and the surface on the suction chamber side and the cylinder bore side are provided. It is a pressure receiving hole penetrating between the surfaces.

  According to the first aspect of the present invention, since the refrigerant gas pressure from the suction chamber side acts on the suction valve by the suction hole and the pressure receiving area increasing portion, a large pressing force is generated even by a small differential pressure between the cylinder bore and the suction chamber. Acts on the intake valve. Therefore, without increasing the diameter of the suction hole, the suction pulsation can be reduced by shifting the suction valve to the open position even with a small differential pressure between the cylinder bore and the suction chamber.

  According to the invention of claim 2, the same operation and effect as the invention of claim 1 can be obtained.

  According to the invention of claim 3, the same operation and effect as the invention of claim 1 can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show an embodiment of the present invention, FIG. 1 (a) is a plan view of the main parts of an intake valve 13 and a valve plate 12, and FIG. 1 (b) is an AA line in FIG. 2 is a cross-sectional view of the compressor 1 to which the valve structure of the present invention is applied, FIG. 3A is a plan view of the valve plate 12, and FIG. 3B is FIG. FIG. 4 is a sectional view taken along line B-B in FIG.

  As shown in FIG. 2, a compressor 1 to which the present invention is applied is a so-called swash plate type variable displacement compressor, and is joined to a substantially cylindrical cylinder block 3 having a plurality of cylinder bores 2 and a front end face of the cylinder block 3. A front housing 5 that forms a crank chamber 4 with the cylinder block 3, and a rear housing 9 that is joined to the rear end side of the cylinder block 3 via a valve body 6 to form a suction chamber 7 and a discharge chamber 8. I have. The cylinder block 3, the front housing 5, and the rear housing 9 are fastened and fixed by a plurality of through bolts 11 through a plurality of through bolt through holes 10 provided in the cylinder block 3.

  The valve body 6 regulates the valve plate 12, the suction valve 13 provided on the cylinder bore 2 side of the valve plate 12, the discharge valve plate 14 provided on the rear housing 9 side, and the opening limit of the discharge valve plate 14. The retainer 15 is configured. The suction valve 13, the discharge valve plate 14, the retainer 15, and the valve plate 12 are sandwiched between the cylinder block 3 and the rear housing 9 while being fastened and fixed together by a rivet 16. Further, a gasket 17 is interposed between the valve plate 12 and the rear housing 9, and the space between the suction chamber 7 and the discharge chamber 8 and the space between the suction chamber 7 and the outside are sealed. Further, an O-ring 18 is interposed on the peripheral surface of the valve plate 12 to prevent the refrigerant from leaking out of the compressor 1.

  As shown in detail in FIGS. 3A and 3B, the valve plate 12 has a disk shape from a flexible material, and corresponds to the cylinder bore 2 on the outer peripheral side of the valve plate main body portion 19 in the circumferential direction. The suction holes 20 provided at six positions at equal angles along the cylinder bore 2 and the suction chamber 7 and the discharges provided at the six positions along the circumferential direction from the inside, that is, the center of the suction holes 20. A hole 21 is formed. An arcuate groove 22 is formed around the suction hole 20 so as to surround the suction hole 20. A valve seat 23 on which the suction valve 13 is seated is formed between the groove 22 and the suction hole 20.

  Further, as shown in detail in FIGS. 1A and 1B, a pressure receiving groove 28, which is a pressure receiving area increasing portion, is formed on the surface of the valve plate 12 on the cylinder bore 2 side and in the vicinity of each suction hole 20. Is formed. Each pressure receiving groove 28 has one end communicating with the suction hole 20 and the other end disposed along the arm valve portion 27. Accordingly, each pressure receiving groove 28 is closed by the arm valve portion 27 and the counter valve portion 26 when the suction valve 13 is closed, and the refrigerant gas in the suction chamber 7 is transferred to the pressure receiving groove 28. It has come in. The central hole 24 is for the rivet 16 to pass therethrough.

  As shown in FIG. 4, the intake valve 13 is thin and flexible, and is formed integrally with the intake valve main body 25 that is in close contact with the valve plate 12. And a plurality of counter valve portions 26 arranged at positions facing the suction holes 20 and the valve seats 23 at the opening edges of the suction holes 20, and arm valve portions that connect the counter valve portions 26 and the suction valve main body portion 25. 27. In the suction valve 13, each arm valve portion 27 is bent and deformed by the pressure difference between the cylinder bore 2 and the suction chamber 7, and each counter valve portion 26 is displaced.

  A drive shaft 30 is disposed at the center of the cylinder block 3 and the front housing 5. One end side of the drive shaft 30 is supported by a shaft support hole 31 of the front housing 5 via a bearing 32, and the other end side is supported by a shaft support hole 33 of the cylinder block 3 via a bearing 34.

  Further, in the crank chamber 4 of the front housing 5, a drive plate 40 a fixed to the drive shaft 30 and a sleeve 35 slidably fitted to the drive shaft 30 are swingably connected by pins 36. A journal 37 and a swash plate 39 fixed to a boss portion 38 of the journal 37 are provided.

  The drive plate 40 a and the journal 37 are connected to the hinge arm 40 via an arc-shaped long hole 49 and a pin 50, and regulate the swing of the swash plate 39. The piston 41 accommodated in each cylinder bore 2 is connected to the swash plate 39 via a pair of shoes 42 sandwiching the swash plate 39, and reciprocates using the rotational motion of the drive shaft 30 as a driving force. The basic performance of the compressor 1 is that the reciprocating motion of the piston 41 compresses the refrigerant sucked into the suction chamber 7 → the valve plate 12 → the suction hole 20 of the valve plate 12 → the cylinder bore 2, and the discharge hole 21 of the cylinder bore 2 → the valve plate 12. → The discharge chamber 8 is discharged.

  Further, in order to make the discharge capacity of the refrigerant variable, an extraction passage (not shown) that always communicates the crank chamber 4 and the suction chamber 7, an air supply passage (not shown) that communicates the crank chamber 4 and the discharge chamber 8, A pressure control mechanism including pressure control means 43 that opens and closes the air supply passage is provided.

  In the above configuration, when the compressor 1 is started and the drive shaft 30 rotates, the rotational force causes the swash plate 39 to rotate and the plurality of pistons 41 reciprocate within the cylinder bore 2. Then, in the process in which the piston 41 moves toward the front housing 5 in the cylinder bore 2, the pressure in the suction chamber 7 becomes larger than that in the cylinder bore 2, and the pressure difference causes the suction valve 13 to change from the closed position to the open position. The refrigerant gas is sucked into the cylinder bore 2. In the process in which the piston 41 moves toward the rear housing 9 in the cylinder bore 2, the pressure in the cylinder bore 2 becomes larger than the suction chamber 7 and the discharge chamber 8, and the differential pressure causes the suction valve 13 to change from the open position to the closed position and discharge. The valve plate 14 changes from the closed position to the open position, and the refrigerant gas is discharged into the discharge chamber 8 from the discharge hole 21 while being compressed.

  During the above operation, in the process in which the piston 41 moves to the front housing 5 side in the cylinder bore 2, the refrigerant gas pressure from the suction chamber 7 side is supplied to the suction valve 13 through the suction hole 20 and the pressure receiving groove 28. Even with a small differential pressure between the cylinder bore 2 and the suction chamber 7, a large pressing force F (= F1 + F2) acts on the counter valve portion 26 and the arm valve portion 27 of the suction valve 13. That is, a pressing force F obtained by adding the pressing force F 1 from the suction hole 20 and the pressing force F 2 from the pressure receiving groove 28 acts on the suction valve 13. As described above, since the suction valve 13 is shifted to the open position even with a small differential pressure between the cylinder bore 2 and the suction chamber 7, the suction pulsation of the suction valve 13 is reduced without increasing the diameter of the suction hole.

  5 (a) and 5 (b) show modified examples of the pressure receiving area increasing portion, FIG. 5 (a) is a plan view of the main parts of the suction valve 13 and the valve plate 12, and FIG. FIG.

  As shown in FIGS. 5A and 5B, the pressure receiving area increasing portion of this modification is provided at a position opposite to the arm valve portion 27, and is between the surface on the suction chamber 7 side and the surface on the cylinder bore 2 side. It is comprised by the pressure receiving hole 29 which penetrates.

  Even in this modification, the pressure of the refrigerant gas from the suction chamber 7 side acts on the suction valve 13 through the suction hole 20 and the pressure receiving hole 29, and the small pressure difference between the cylinder bore 2 and the suction chamber 7 is caused. A large pressing force F (= F1 + F2) acts on the counter valve portion 26 and the arm valve portion 27 of the suction valve 13. In other words, the pressing force F obtained by adding the pressing force F1 from the suction hole 20 and the pressing force F2 from the pressure receiving hole 29 acts on the suction valve 13. As described above, since the suction valve 13 is shifted to the open position even with a small differential pressure between the cylinder bore 2 and the suction chamber 7, the suction pulsation of the suction valve 13 is reduced without increasing the diameter of the suction hole.

  In the modification, the pressure receiving area increasing portion is configured by one pressure receiving hole 29, but may be configured by a plurality of pressure receiving holes 29. Further, the pressure receiving area increasing portion may be configured by using both the pressure receiving groove 28 of the above embodiment and the pressure receiving hole 29 of the modification.

The valve structure of one Embodiment of this invention is shown, (a) is a principal part top view of an inlet valve and a valve plate, (b) is the AA line (AA line of FIG. 3) sectional drawing of FIG. is there. It is sectional drawing which shows the compressor with which this invention was used. (A) is a top view of a valve plate, (b) is the BB sectional view of Fig.3 (a). It is a top view of an intake valve. The modification of a pressure receiving area increase part is shown, (a) is a principal part top view of a suction valve and a valve plate, (b) is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Cylinder bore 7 Suction chamber 8 Discharge chamber 12 Valve plate 13 Suction valve 20 Suction hole 21 Discharge hole 23 Valve seat 25 Suction valve body part 26 Opposite valve part 27 Arm valve part 28 Pressure receiving groove (pressure receiving area increasing part)
29 Pressure receiving hole (Pressure receiving area increasing part)

Claims (3)

A valve body (6) is provided between the cylinder bore (2) in which the piston (41) is accommodated and the suction chamber (7) and the discharge chamber (8), and the valve body (6) is connected to the cylinder bore (2). A valve plate (12) having a suction hole (20) communicating with the suction chamber (7), a discharge hole (21) communicating with the cylinder bore (2) and the discharge chamber (8); A flexible plate-like intake valve (13) provided on the cylinder bore (2) side of the valve plate (12) for opening and closing the intake hole (20), and the cylinder bore by reciprocating movement of the piston (41) A valve structure of the compressor (1) in which the suction valve (13) is opened and closed by a differential pressure between the suction chamber (2) and the suction chamber (7);
The suction valve (13) is opposed to the suction valve main body (25) that is in close contact with the valve plate (12), and the valve seat (23) at the opening edge of the suction hole (20) and the suction hole (20). The counter valve portion (26) arranged at a position where the suction valve main body portion (25) and the counter valve portion (26) are connected, and the differential pressure between the cylinder bore (2) and the suction chamber (7) And an arm valve part (27) for displacing the counter valve part (26) by bending deformation and bending return deformation by
The valve plate (12) includes a pressure receiving area increasing portion (28) that increases a pressure receiving area of the refrigerant gas in the suction chamber (7) with respect to the counter valve portion (26) and the arm valve portion (27). (29) The valve structure of the compressor (1) characterized by the above-mentioned. A valve structure for a compressor (1) according to claim 1,
The pressure receiving area increasing portions (28), (29) are provided on the cylinder bore (2) side along the arm valve portion (27), and are pressure receiving grooves (28) communicating with the suction hole (20). The valve structure of the compressor (1) characterized by being. A valve structure for a compressor (1) according to claim 1,
The pressure receiving area increasing portions (28) and (29) are provided at positions facing the arm valve portion (27), and between the surface on the suction chamber (7) side and the surface on the cylinder bore (2) side. The valve structure of the compressor (1), which is a pressure receiving hole (29) that passes therethrough.

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