JP2004301077A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor for damping pressure pulsation without making the entire compressor large. <P>SOLUTION: The compressor is provided with a plurality of pistons 34 with a substantially columnar shape reciprocating respectively having a prescribed phase difference, a partition 13 formed on a bottom wall 10b of a rear housing 10 along a circumferential direction, abutting a valve plate 32, an intake chamber 11 formed in an outer peripheral side of the partition 13 in the rear housing 10 to be communicated to an intake port 14, a discharge chamber 12 formed in an inner peripheral side of the partition 13, and a divider plate 15 dividing the intake chamber 11 into an upstream side intake chamber 11a and a downstream side intake chamber 11b and dividing the downstream side intake chamber 11b into a plurality of supply chambers 11c. In the compressor, the upstream side intake chamber 11a and the supply chamber 11c are communicated through an intake communicating hole 15a provided in the divider plate 15, and the supply chamber 11c is communicated with a plurality of cylinder bores 31 through an intake hole 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compressor for adiabatically compressing a working gas.
[0002]
[Prior art]
2. Description of the Related Art As a conventionally used compressor, a compressor disclosed in Patent Literature 1 is known.
[0003]
This is because the muffler chambers whose open sides are opposed to each other are stretched on the outer periphery of the cylinder block and cylinder head, and the open edges of both muffler chambers are simultaneously sealed by the interposition of a partition part extending integrally from the valve plate. As a result, it is possible to easily form a sealed muffler chamber that is independent or independent of front and rear, left and right, and can effectively reduce pressure pulsation without increasing the overall length of the body.
[0004]
[Patent Document 1]
JP-A-8-254181
[Problems to be solved by the invention]
However, in the prior art, since the muffler chamber is stretched in the radial direction in order to prevent an increase in the total length of the fuselage, the degree of freedom in attaching the compressor body to a vehicle or the like is deteriorated.
[0006]
Therefore, an object of the present invention is to provide a compressor that can attenuate pressure pulsation without increasing the size of the entire apparatus.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, a cylinder block having a plurality of cylinder bores having a cylindrical shape, a front housing having a crank chamber, a suction port to which a working gas is supplied from outside, and a flow of the working gas are provided. A rear housing having a passage, a suction chamber formed by joining the rear housing via a valve plate to a rear end surface of the cylinder block, and a discharge chamber, and housed in the crank chamber; In addition, the piston housed slidably in the cylinder bore has a substantially cylindrical shape that reciprocates with a predetermined phase difference when the drive shaft whose end is supported by the front housing and the cylinder block rotates. In the compressor, a partition wall is formed on a bottom wall of the rear housing along a circumferential direction, and abuts against the valve plate. A suction chamber formed in the rear housing at an outer peripheral side of the partition wall and communicating with the suction port; a discharge chamber formed at an inner peripheral side of the partition wall; and an upstream suction chamber and a downstream suction port for the suction chamber. And a partition plate for dividing the downstream suction chamber into a plurality of supply chambers, and the upstream suction chamber and the supply chamber are communicated with each other by a suction communication hole provided in the partition plate. The supply chamber is communicated with the plurality of cylinder bores through a suction hole provided in the valve plate.
[0008]
According to a second aspect of the present invention, in the compressor according to the first aspect, the partition plate abuts on the valve plate while extending along an axial direction of the drive shaft. And
[0009]
According to a third aspect of the present invention, in the compressor according to the first or second aspect, the upstream suction chamber has a predetermined capacity.
[0010]
【The invention's effect】
According to the first aspect of the invention, the suction chamber is divided into an upstream suction chamber and a downstream suction chamber, and the downstream suction chamber is divided into a plurality of supply chambers, so that the entire apparatus is not enlarged. In addition, the pressure pulsation generated when the working gas is sucked can be attenuated.
[0011]
According to the second aspect of the invention, in addition to the effects of the first aspect, the shape of the partition plate is simplified, and the pressure pulsation generated when the working gas is sucked is attenuated without greatly increasing the manufacturing cost. can do.
[0012]
According to the third aspect of the invention, in addition to the effects of the first and second aspects, the upstream suction chamber has a predetermined capacity corresponding to the normal rotation speed of the compressor, the capacity of the cylinder bore, and the like. Accordingly, the pressure pulsation generated when the working gas is sucked in the upstream suction chamber can be further attenuated.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a compressor according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of a compressor according to an embodiment of the present invention, and FIG. 2 is a front view of a rear housing of the compressor.
[0014]
The compressor according to the present embodiment is a variable capacity swash plate type compressor, which is used, for example, in a cooling cycle of a vehicle air conditioner, and adiabatically compresses a refrigerant gas as a working gas vaporized in a refrigeration cycle.
[0015]
The variable capacity swash plate type compressor 1 includes a cylinder block 30 in which a plurality of cylinder bores 31 each having a cylindrical shape are arranged at equal intervals along a circumferential direction, and a front end face 30 a of the cylinder block 30 is provided with a front housing 40. By joining the open end 41, the suction chamber 11, the discharge chamber, and the crank chamber 42 formed between the cylinder block 30 and the front housing 40 are joined to the rear end face 30b of the cylinder block 30 via the valve plate 32. And a rear housing 10 forming the rear housing 12. The cylinder block 30, the front housing 40, and the rear housing 10 are fastened and fixed by a plurality of through bolts 43.
[0016]
The valve plate 32 includes a suction hole 33 that communicates the cylinder bore 31 with the suction chamber 11, and a discharge hole (not shown) that communicates the cylinder bore 31 with the discharge chamber 12. A valve mechanism (not shown) for opening and closing the suction hole 33 is provided on the cylinder block 30 side of the valve plate 32, while a valve mechanism (not shown) for opening and closing the discharge hole is provided on the rear housing 10 side of the valve plate 32. ) Is provided. A gasket is sandwiched between the valve plate 32 and the rear housing 10 so that the airtightness of the suction chamber 11 and the discharge chamber 12 is maintained. Further, an O-ring is sandwiched between the peripheral surface of the valve plate 32 and the joint surface between the rear housing 10 and the cylinder block 30 to prevent the refrigerant from leaking out of the variable displacement swash plate type compressor 1.
[0017]
A drive shaft 45 is supported by bearings in support holes 44 a and 44 b at the center of the cylinder block 30 and the front housing 40, and the drive shaft 45 can rotate in the crank chamber 42.
[0018]
The crank chamber 42 includes a drive plate 46 fixed to a drive shaft 45, a journal 49 slidably connected to a sleeve 47 slidably fitted to the drive shaft 45 by a pin 48 a, and a journal 49. The boss 50 is provided with a wobble plate (swash plate) 51 rotatably held by a bearing with respect to the journal 49.
[0019]
The wobble plate 51 is slidably connected to a regulating plate 52 fixed in the crank chamber 42, thereby preventing rotation and allowing swinging in the axial direction. That is, when the journal 49 is rotated by the rotation of the drive shaft 45, the wobble plate 51 is non-rotated and swings in the axial direction with the rotation swing of the journal 49.
[0020]
The drive plate 46 and the journal 49 have their hinge arms 53a and 53b connected via an arc-shaped long hole 54 and a pin 48b, so that the wobble plate 51 has a maximum inclination angle and a minimum inclination angle. Is regulated. The piston 34 housed in each cylinder bore 31 is connected to the wobble plate 51 via the piston rod 35, and reciprocates with a predetermined phase difference by the swing of the wobble plate 51. ing.
[0021]
The rear housing 10 includes an outer peripheral wall 10a having a substantially cylindrical shape, and a bottom wall 10b closing one end of the outer peripheral wall 10a, and a refrigerant flow path is formed inside. A partition wall 13 is formed on the bottom wall 10 b of the rear housing 10 along the circumferential direction of the rear housing 10 and extends in contact with the valve plate 32. On the outer peripheral side of the partition wall 13, a suction chamber 11 provided on the outer peripheral wall 10a and communicating with a suction port 14 to which a refrigerant gas is supplied from the outside is formed. On the inner peripheral side of the partition wall 13, a cylinder bore 31 is provided. A discharge chamber 12 from which the compressed refrigerant gas is discharged is formed.
[0022]
The suction chamber 11 is provided with a partition plate 15 for partitioning the suction chamber 11 into an upstream suction chamber 11a and a downstream suction chamber 11b. Further, the partition plate 15 is provided with a rib 16 so as to contact the valve plate 32 along the axial direction of the drive shaft 45, and the downstream suction chamber 11b is divided into a plurality of supply chambers by the partition plate 15 and the rib 16. 11c.
[0023]
The upstream suction chamber 11a and the supply chamber 11c communicate with each other through a suction communication hole 15a provided in the partition plate 15, and the supply chamber 11c communicates with the plurality of cylinder bores 31 through a suction hole 33 provided in the valve plate 32. Are in communication.
[0024]
In this embodiment, the ribs 16 are provided so that the refrigerant gas is supplied to the two cylinder bores 31 from one supply chamber 11c. The upstream suction chamber 11a has a predetermined volume corresponding to the normal rotation speed of the variable capacity swash plate type compressor 1, the capacity of the cylinder bore 31, and the like.
[0025]
In the variable displacement swash plate type compressor 1 of the present embodiment, a refrigerant is introduced into the inside from a pipe (not shown) of an external circuit connected to the suction port 14. The introduced refrigerant is supplied from the suction port 14 to the upstream suction chamber 11a, and is further diverted from the upstream suction chamber 11a to the plurality of supply chambers 11c through the suction communication holes 15a. Then, the refrigerant is charged into the cylinder bore 31 through the suction hole 33 of the valve plate 32 and is compressed by the reciprocating motion of the piston 34.
[0026]
Thereafter, the variable displacement swash plate type compressor 1 discharges the refrigerant compressed from the cylinder bore 31 through the discharge holes of the valve plate 32 into the discharge chamber 12, and further, transmits the high-pressure refrigerant from the discharge chamber 12 through the discharge port 17 to an external circuit ( (Not shown).
[0027]
Further, in order to change the discharge capacity of the refrigerant, a bleed passage that constantly communicates the crank chamber 42 with the suction chamber 11, an air supply passage that communicates the crank chamber 42 with the discharge chamber 12, A pressure control mechanism including a control valve (not shown) that opens and closes is provided.
[0028]
When the control valve opens and closes, the refrigerant pressure in the crank chamber 42 changes, and the tilt angle of the wobble plate 51 changes due to the pressure balance between the crank chamber 42 and the suction chamber 11. Thereby, the stroke amount of the piston 34 changes, and the discharge capacity of the variable displacement swash plate type compressor 1 can be changed.
[0029]
Therefore, the rear housing 10 is enlarged by partitioning the suction chamber 11 into the upstream suction chamber 11a and the downstream suction chamber 11b and dividing the downstream suction chamber 11b into a plurality of supply chambers 11c. Without this, the pressure pulsation generated when the refrigerant is sucked can be attenuated.
[0030]
The shape of the partition plate 15 can be simplified, and the pressure pulsation generated when the refrigerant is sucked can be attenuated without significantly increasing the manufacturing cost.
[0031]
Since the upstream suction chamber 11a has a predetermined capacity corresponding to the normal rotation speed of the variable capacity swash plate type compressor 1, the capacity of the cylinder bore 31, and the like, it is generated when the upstream suction chamber 11a sucks refrigerant. Pressure pulsation can be further attenuated.
[0032]
In the present embodiment, a case where the wobble plate type variable displacement swash plate type compressor 1 is adopted has been described, but a swash plate type variable displacement type swash plate type compressor and a swash plate type compressor having a constant capacity are used. As described above, the same effect as that of the variable displacement swash plate type compressor 1 of the present embodiment can be obtained when the compressor is employed in a compressor having a plurality of cylinder bores.
[Brief description of the drawings]
FIG. 1 is an overall view of a variable displacement swash plate type compressor according to an embodiment of the present invention.
FIG. 2 is a front view of the rear housing of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Variable capacity swash plate compressor 10 ... Rear housing 10b ... Bottom wall 11 ... Suction chamber 11a ... Upstream suction chamber 11b ... Downstream suction chamber 11c ... Supply chamber 12 ... Discharge chamber 13 ... Partition wall 14 ... Suction port 15 ... Partition Plate 15a ... Suction communication hole 30 ... Cylinder block 31 ... Cylinder bore 32 ... Valve plate 33 ... Suction hole 34 ... Piston 40 ... Front housing 42 ... Crank chamber 45 ... Drive shaft

Claims (3)

A cylinder block (30) having a plurality of cylinder bores (31) having a cylindrical shape;
A front housing (40) having a crankcase (42);
A rear housing (10) having a suction port (14) to which a working gas is supplied from the outside and a flow path of the working gas;
A suction chamber (11) formed by joining the rear housing (10) to the rear end face of the cylinder block (30) via a valve plate (32), and a discharge chamber (12);
The drive shaft (45) housed in the crank chamber (42) and supported at the end by the front housing (40) and the cylinder block (30) rotates to slide into the cylinder bore (31). In a compressor having a substantially cylindrical shape in which a freely housed piston (34) reciprocates with a predetermined phase difference,
A partition wall (13) formed along a circumferential direction on a bottom wall (10b) of the rear housing (10) and abutting on the valve plate (32);
A suction chamber (11) formed in the rear housing (10) on the outer peripheral side of the partition (13) and communicating with the suction port (14);
A discharge chamber (12) formed on the inner peripheral side of the partition (13);
A partition plate (15) that partitions the suction chamber (11) into an upstream suction chamber (11a) and a downstream suction chamber (11b), and divides the downstream suction chamber (11b) into a plurality of supply chambers (11c). ) And
The upstream suction chamber (11a) and the supply chamber (11c) are connected by a suction communication hole (15a) provided in the partition plate (15), and the supply chamber (11c) is connected to the valve plate (32). ), Which is in communication with the plurality of cylinder bores (31) through suction holes (33) provided in the compressor. The compressor according to claim 1,
The compressor, wherein the partition plate (15) extends along the axial direction of the drive shaft (45) and is in contact with the valve plate (32). In the compressor according to claim 1 or 2,
A compressor, wherein the upstream suction chamber (11a) has a predetermined capacity.

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