JPH0735039A - Reciprocative compressor - Google Patents

Abstract

PURPOSE:To prevent noise generated by the resonance effect when refrigerant gas passes a suction passage at the time of suction stroke. CONSTITUTION:A suction part 30 formed at a rear housing 3 is composed of a refrigerant lead-in hole 31, through which refrigerant gas is introduced from an external refrigeration circuit, and a branch passage 32a (32b, 32c, 32d) diverged from the hole 31 and led to the suction port 27 of a valve plate 4 independently. The refrigerant path sections including the suction part 30 and suction port 27 have all the cross-sections in the same shape and dimensions. When the gas flows through the refrigerant path under the suction stroke, there is no risk of generation of resonance effect on the basis of the change in the flow path section area, and noise generation is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a reciprocating compressor used in a vehicle air conditioner or the like.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 60-175783.
There is known a compressor that compresses a refrigerant gas by reciprocating each piston in a plurality of bores formed in a cylinder block in parallel with the drive shaft, like the swash plate compressor described in Japanese Patent Publication No. . In this type of compressor, a drive shaft is inserted into and supported by a central shaft hole of a cylinder block, and each piston is linearly moved in each bore by being linked to a swash plate in a crank chamber that cooperates with the drive shaft. A housing is joined to the end surface of the cylinder block via a valve plate.
A discharge chamber is provided in the central region and a suction chamber is provided in the outer peripheral region so as to communicate with the respective bores. The refrigerant gas is sucked into the suction chamber from an external refrigeration circuit via a refrigerant introduction hole penetrating the outer peripheral wall of the housing. Further, the valve plate is formed with an intake port and a discharge port corresponding to each bore,
A suction valve and a discharge valve are provided at the suction port and the discharge port, respectively.

When the swash plate rotates as the drive shaft is driven, each piston reciprocates in the bore, whereby the refrigerant gas is sucked from the suction chamber into the bore, and the refrigerant gas is compressed and then discharged. It is discharged into the chamber.

[0004]

However, in the above-mentioned conventional compressor, the suction port formed in the valve plate, the suction chamber formed in the housing, and the refrigerant introduction hole through which the refrigerant gas is sucked from the external refrigeration circuit. The cross-sectional shape and cross-sectional area are different. Therefore, when the refrigerant gas passes through the refrigerant introduction hole, the suction chamber and the suction port, abnormal noise is generated due to the resonance effect. Such an abnormal sound is transmitted to the evaporator in the vehicle compartment through a pipe in a vehicle air conditioner, for example, and becomes a problem.

The present invention has been made in view of the above circumstances, and it is a technical problem to be solved to prevent abnormal noise from being generated when the refrigerant gas passes through the suction passage of the housing during the suction stroke. To do.

[0006]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems includes a cylinder block having a plurality of bores parallel to an axis, a drive shaft fitted and supported in a shaft hole of the cylinder block, A piston that is linearly moved in the bore by being linked to a swash plate that cooperates with a drive shaft, a housing that is joined to the outer end of the cylinder block via a valve plate, and a housing formed in the housing and penetrating the valve plate. In a reciprocating compressor having an intake part communicating with the bore through an installed intake port, the intake part is provided with a refrigerant introduction hole and each of the intake ports branched from the refrigerant introduction hole. A novel means is adopted, which is composed of branch passages that communicate independently and all the cross sections of a series of refrigerant passages including the suction portion and the suction port are formed to have the same shape and size.

[0007]

When the reciprocating compressor of the present invention is driven, it is formed in the housing through the suction port penetrating the valve plate by the reciprocating motion of the piston due to the rotation of the drive shaft and the swash plate. Refrigerant gas is sucked into the bore from the suction portion. In the compressor of the present invention, the suction section includes a refrigerant introduction hole and a branch passage that branches from the refrigerant introduction hole and communicates with the respective suction openings independently of each other. All the cross sections of the series of refrigerant flow paths including are formed in the same shape and size. For this reason, when the refrigerant gas from the external refrigeration circuit passes through the refrigerant flow path during the suction stroke, the resonance effect based on the change in the flow path cross-sectional area is suppressed, so that generation of abnormal noise is suppressed. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a variable displacement type swash plate compressor will be described below with reference to the drawings. FIG. 1 is a sectional view taken along the axial direction of the compressor according to the present embodiment, and FIG. 2 is a sectional view taken along the line perpendicular to the axis taken along the line AA in FIG. In the figure, reference numeral 1 is a cylinder block that constitutes a part of the outer contour of the compressor. A front housing 2 is joined to the front end of the cylinder block 1, and a rear housing 3 is provided with a valve plate 4 at the rear end. Are joined through. A drive shaft 6 penetrates through a crank chamber 5 formed by the cylinder block 1 and the front housing 2, and the drive shaft 6 is rotatably mounted on the cylinder block 1 and the front housing 2 via a bearing 7. It is supported. The cylinder block 1 is provided with six bores 8 around the axis and parallel to the axis.
The pistons 9 are inserted in the respective.

In the crank chamber 5, the drive shaft 6 supports a rotary support 10 so as to be rotatable in synchronization with the drive shaft 6, and a spherical sleeve 11 so as to be rotatable and slidable. The spherical sleeve 11 is biased in the rear direction by a pressing spring 12 mounted on the outer periphery of the drive shaft 6. On the spherical sleeve 11, the spherical sleeve 11
A swash plate 14 which is formed in an annular shape so as to surround the is supported so as to be swingable back and forth.

Hemispherical shoes 15 are engaged with both outer peripheral surfaces of the swash plate 14, and the outer surfaces of the shoes 15 are opposite to each other in the swash plate passage grooves 9a formed in the neck of the piston 9. It is engaged with the support surface. Thus
A plurality of pistons 9 moored to the swash plate 14 via shoes 15 are housed in the respective bores 8 so as to be capable of reciprocating. In addition, a pair of arm portions 17 are provided on the rear surface of the upper portion of the swash plate 14 so as to project symmetrically with the drive shaft 6 interposed therebetween. on the other hand,
A pair of support arms 18 is provided on the upper portion of the rotary support 10 so as to face the pair of arm portions 17 and project rearward. The upper ends of the support arms 18 are gripped by the tip ends thereof. A guide pin 21 having a lower end slidably fitted therein is attached to each arm portion 17.

A discharge chamber 23 communicating with the bore 8 is formed in the center region of the rear housing 3 on the front end face side, and a suction portion 30 is provided in the rear housing 3 on the outer peripheral side and the rear side of the discharge chamber 23. Has been formed. The discharge chamber 23 has a valve plate 4
Through the discharge port 24 and the discharge valve 25 which are provided through the bore 8.
It also communicates with a refrigerant discharge hole 26 that penetrates the outer peripheral wall of the rear housing 3 and discharges the refrigerant gas to the external refrigeration circuit. On the other hand, the suction portion 30 is provided with a refrigerant introduction hole 31 through which a refrigerant gas is introduced from an external refrigeration circuit by penetrating through the rear end wall of the rear housing 3 concentrically with the drive shaft 6, and the refrigerant introduction hole. 31. Branch passages 32a to 32f that branch from 31 and extend radially, bend at a position corresponding to the suction port 27 and extend in the axial direction, and communicate with each suction port 27 independently of each other. Has been done. A suction valve 28 is provided at the suction port 27. Then, the refrigerant introduction hole 31 and each branch passage 32a
.About.32f, and the series of refrigerant flow paths including the suction port 27 are formed so that their cross sections have the same shape and dimensions. Further, the rear housing 3 is equipped with a pressure control valve (not shown) for adjusting the pressure in the crank chamber 5.

In the compressor configured as described above,
When the swash plate 14 rotates with the rotation of the drive shaft 6, the swash plate 14 moored with each piston 9 slides in the circumferential direction with respect to the spherical sleeve 11 and swings to move each piston 9. Reciprocates in the bore 8. As a result, each branch passage 3 returned from the external refrigeration circuit via the refrigerant introduction hole 31.
The bore 8 in which the refrigerant gas in 2a to 32f is in the process of expanding its volume
The refrigerant gas is sucked into the discharge chamber 23 through the discharge port 24 and the discharge valve 25 while being compressed. At this time, the discharge capacity of the refrigerant gas discharged to the discharge chamber 23 is controlled by adjusting the pressure in the crank chamber 5 by the pressure control valve.
Then, the refrigerant gas in the discharge chamber 23 is sent out to the refrigeration circuit through the refrigerant discharge hole 26.

In the compressor of this embodiment, the suction section 3
Refrigerant introduction hole 31 and each branch passage 32a-3
2f and the series of refrigerant flow passages including the suction port 27 penetrating the valve plate 4 are all formed to have the same shape and size, so that the refrigerant gas from the external refrigeration circuit is discharged during the suction stroke. When passing through the refrigerant channel, the resonance effect based on the change in the channel cross-sectional area does not occur. Therefore, the compressor of the present embodiment can suppress the generation of abnormal noise in the suction section 30.

In the above-described embodiment, an example in which the coolant introduction hole 31 is provided through the rear end wall of the rear housing 3 concentrically with the drive shaft 6 has been described. However, the coolant introduction hole 31 is formed on the outer peripheral wall of the rear housing 3. The present invention can also be applied to a compressor penetrating the above. In the above-described embodiment, the discharge chamber 23 is formed on the inner peripheral side of the rear housing 3, and the suction portion 30 is formed on the outer peripheral side and the rear side of the discharge chamber 23. The present invention can also be applied to a compressor in which the suction portion 30 is formed on the side and the discharge chamber 23 is formed on the outer peripheral side.

Further, although the swash plate type compressor of the above embodiment is of a variable capacity type, the swash plate 14 is fixed to the drive shaft 6 at a predetermined inclination angle and the piston 9 of the piston 9 is changed by the pressure change of the crank chamber 5. The present invention can also be applied to a fixed displacement type swash plate compressor configured to operate at a predetermined discharge capacity without adjusting the stroke.

[0016]

According to the compressor of the present invention, the suction portion is composed of the refrigerant introduction hole and the branch passage which branches from the refrigerant introduction hole and communicates with the respective suction ports independently of each other. Since a series of cross sections of the refrigerant flow path including the suction part and the suction port are all formed in the same shape and size, when the refrigerant gas passes through the refrigerant flow path, resonance caused by a change in the cross-sectional area of the flow path is generated. The effect can be suppressed, and the generation of abnormal noise can be prevented as much as possible. Therefore, when the compressor of the present invention is applied to a vehicle air conditioner, it is possible to suppress abnormal noise and vibration that are transmitted from the suction portion of the compressor to the evaporator and the like in the vehicle compartment through the pipe. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along an axial direction of a compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 in a direction perpendicular to the axis of the compressor.

[Explanation of symbols]

1 ... Cylinder block 3 ... Rear housing 5 ...
Crank chamber 6 ... Drive shaft 8 ... Bore 9 ... Piston 14 ... Swash plate 27 ... Suction port 30 ... Suction section 31 ... Refrigerant introduction hole 32a to 32f
… Branch passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Konomura 2-chome, Toyota-cho, Kariya City, Aichi Stock Company Toyota Industries Corp.

Claims (1)

[Claims] 1. A cylinder block having a plurality of bores parallel to an axial center, a drive shaft fitted and supported in a shaft hole of the cylinder block, and a swash plate cooperating with the drive shaft. A piston that directly moves in the bore, a housing joined to the outer end of the cylinder block via a valve plate, and a suction port formed in the housing and penetrating the valve plate communicate with the bore. In a reciprocating compressor including a suction section, the suction section includes a refrigerant introduction hole and a branch passage branched from the refrigerant introduction hole and independently communicating with each of the suction ports. A reciprocating compressor, wherein all the cross sections of a series of refrigerant flow paths including the suction part and the suction port are formed in the same shape and size.