JP2005264888A - Multicylinder reciprocating compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multicylinder reciprocating compressor equipped with a plurality of cylinder bores, a piston reciprocating in respective cylinder bores, a suction chamber communicating to a plurality of cylinder bores through the medium of a suction hole and a suction valve, a suction port communicating to the suction chamber, a discharge chamber communicating to a plurality of cylinder bores through the medium of a discharge hole and a discharge valve, and a discharge port communicating to the discharge chamber, whereby noise of an air conditioner system freezing circuit generated by pulsation of refrigerant gas can be suppressed as compared with conventional one. <P>SOLUTION: The multicylinder reciprocating compressor is equipped with a plurality of cylinder bores, a piston reciprocating in respective cylinder bores, a suction chamber communicating to a plurality of cylinder bores through the medium of a suction hole and a suction valve, a suction port communicating to the suction chamber, a discharge chamber communicating to a plurality of cylinder bores through the medium of a discharge hole and a discharge valve, and a discharge port communicating to the discharge chamber. The discharge chamber communicate with the discharge port through the medium of a plurality of communication passages. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a multi-cylinder reciprocating compressor.

A plurality of cylinder bores, a piston that reciprocates in each cylinder bore, a suction chamber that communicates with the plurality of cylinder bores via a suction hole and a suction valve, a suction port that communicates with the suction chamber, a discharge hole, and a discharge valve; A multi-cylinder reciprocating compressor including a discharge chamber that communicates with the plurality of cylinder bores and a discharge port that communicates with the discharge chamber is disclosed in Patent Document 1 and the like.
In the conventional multi-cylinder reciprocating compressor, the discharge chamber communicates with the discharge port through a single communication path.
6-4378

In the conventional multi-cylinder reciprocating compressor, the pulsation of the refrigerant gas generated in the discharge chamber propagates to the air conditioner system refrigeration circuit connected to the compressor, and the condenser of the refrigeration circuit resonates to generate noise. was there.

The present invention has been made in view of the above problems, and includes a plurality of cylinder bores, a piston that reciprocates within each cylinder bore, a suction chamber that communicates with the plurality of cylinder bores via a suction hole and a suction valve, A multi-cylinder reciprocating compressor comprising a suction port communicating with a chamber, a discharge chamber communicating with the plurality of cylinder bores via a discharge hole and a discharge valve, and a discharge port communicating with the discharge chamber, An object of the present invention is to provide a multi-cylinder reciprocating compressor capable of suppressing noise of an air-conditioning system refrigeration circuit caused by pulsation of refrigerant gas generated in the conventional example.

In order to solve the above problems, in the present invention, a plurality of cylinder bores, pistons that reciprocate within each cylinder bore, a suction chamber that communicates with the plurality of cylinder bores via a suction hole and a suction valve, and a suction chamber A discharge port communicating with the plurality of cylinder bores via a discharge hole and a discharge valve, and a discharge port communicating with the discharge chamber, and the discharge chamber is connected to the discharge port via the plurality of communication passages. A multi-cylinder reciprocating compressor characterized in that it is communicated with the compressor.
The refrigerant gas flowing from the discharge hole toward the inlet of the communication path between the discharge chamber and the discharge port formed in the discharge chamber surrounding wall forms an air column, and the air column forms a dense wave and longitudinally vibrates. As a result, pulsation of the refrigerant gas occurs in the discharge chamber. When the communication passage between the discharge chamber and the discharge port is single, the longest air column formed between the discharge hole farthest from the inlet of the communication passage formed in the discharge chamber surrounding wall and the communication passage inlet is It pulsates at the lowest frequency, and the shortest air column formed between the discharge hole closest to the inlet of the communication passage and the communication passage inlet pulsates at the highest and lowest frequencies. The lowest frequency pulsation can cause resonance in the condenser of the air conditioner system refrigeration circuit and cause noise. In the multi-cylinder reciprocating compressor according to the present invention, the discharge chamber communicates with the discharge port via a plurality of communication passages, and a plurality of communication passage inlets are formed in the discharge chamber surrounding wall. Since the air column is formed between the inlet and the close communication path inlet, the longest column length is shortened as compared with the conventional multi-cylinder reciprocating compressor having only a single communication path inlet. As a result, the minimum frequency of the refrigerant gas pulsation becomes higher than before, the lowest frequency pulsation and the resonance of the condenser of the air conditioner system refrigeration circuit are suppressed, and consequently the air conditioner system refrigeration caused by the refrigerant gas pulsation generated in the discharge chamber. Circuit noise is suppressed.

In a preferred aspect of the present invention, the inlets of the plurality of communication passages are opened at portions separated from each other in the discharge chamber surrounding wall.
If the inlets of the plurality of communication passages are opened at portions separated from each other in the discharge chamber surrounding wall, the maximum value of the distance between the discharge hole and the communication passage inlet close to the discharge hole is the conventional multi-cylinder reciprocation. Compared to the maximum value of the distance between the discharge hole and the communication path inlet in the dynamic compressor, it is surely shortened. As a result, the minimum frequency of the refrigerant gas pulsation is surely higher than before, and the lowest frequency pulsation and the resonance of the condenser of the air conditioning system refrigeration circuit are surely suppressed, and as a result, the refrigerant gas pulsation generated in the discharge chamber The noise of the air conditioner system refrigeration circuit is reliably suppressed.

In the multi-cylinder reciprocating compressor according to the present invention, a plurality of communication passage inlets are formed in the discharge chamber surrounding wall, and an air column is formed between the discharge hole and the communication passage inlet close to the discharge hole. Compared with the conventional multi-cylinder reciprocating compressor having only the communication path inlet, the longest column length is shortened. As a result, the minimum frequency of the refrigerant gas pulsation becomes higher than before, the lowest frequency pulsation and the resonance of the condenser of the air conditioning system refrigeration circuit are suppressed, and as a result, the air conditioning system refrigeration caused by the refrigerant gas pulsation generated in the discharge chamber Circuit noise is suppressed.

An embodiment in which the present invention is applied to a swash plate compressor will be described.

As shown in FIG. 1, a variable capacity swash plate compressor A connected to a refrigeration circuit of an in-vehicle air conditioner system (not shown) includes a drive shaft 10, a rotor 11 fixed to the drive shaft 10, and a drive shaft with variable tilt angle. 10 and a swash plate 12 supported by 10. The swash plate 12 is connected to the rotor 11 via a link mechanism 13 that allows the tilt angle of the swash plate 12 to vary, and rotates in synchronization with the rotor 11 and thus the drive shaft 10.
A piston 15 is moored to the swash plate 12 via a pair of shoes 14 that are in sliding contact with the peripheral edge of the swash plate 12. The head 15 a of the piston 15 is inserted into a cylinder bore 16 a formed in the cylinder block 16. A plurality of cylinder bores 16a are arranged at intervals in the circumferential direction, and a piston head 15a is inserted into each cylinder bore 16a.
A bottomed cylindrical front housing 18 that forms a crank chamber 17 that houses the drive shaft 10, the rotor 11, and the swash plate 12 is disposed.
A cylinder head 19 is disposed that forms an annular suction chamber 19a and a cylindrical discharge chamber 19b disposed radially inward of the suction chamber 19a. The suction chamber 19 a communicates with the suction port 20, and the discharge chamber 19 b communicates with the discharge port 21.

A valve plate 22 having a suction hole 22a and a discharge hole 22b is disposed between the cylinder block 16 and the cylinder head 19. The suction hole 22a communicates with the suction chamber 19a and the cylinder bore 16a, and the discharge hole 22b communicates with the discharge chamber 19b and the cylinder bore 16a. A reed valve type suction valve 23 for opening and closing the suction hole 22a, a reed valve type discharge valve 24 for opening and closing the discharge hole 22b, and a retainer 25 for regulating the opening degree of the discharge valve 24 are provided.
The front housing 18, the cylinder block 16, the valve plate 22 and the cylinder head 19 are integrally assembled by bolts 26.
The drive shaft 10 is rotatably supported by the front housing 18 and the cylinder block 16.

As shown in FIG. 2, the discharge chamber 19b communicates with the discharge port 21 via two communication passages 27a and 27b. The inlets 27a'27b 'of the communication passages 27a, 27b are opened at positions separated by approximately 180 degrees in plan view of the discharge chamber surrounding wall.

In the variable capacity swash plate compressor A, the rotation of the drive shaft 10 is transmitted to the swash plate 12 via the rotor 11 and the link mechanism 13. The reciprocating motion in the extending direction of the drive shaft 10 at the peripheral edge of the swash plate 12 accompanying the rotation of the swash plate 12 is transmitted to the piston 15 via the shoe 14. The piston head 15a reciprocates in the cylinder bore 16a, recirculates from the air conditioning system refrigeration circuit, and compresses the refrigerant gas flowing into the cylinder bore 16a through the suction port 20, the suction chamber 19a, the suction hole 22a, and the suction valve 23. .
The compressed refrigerant gas is discharged into the discharge chamber 19b through the discharge hole 22b and the discharge valve 24. The refrigerant gas discharged from the discharge hole 22b to the discharge chamber 19b flows toward the communication passage inlet closer to the communication passage inlets 27a ′ and 27b ′, flows into the communication passage from the inlet, and passes through the communication passage. It reaches the discharge port 21 and returns to the refrigeration circuit of the air conditioning system.

An air column is formed by the refrigerant gas flowing from the discharge hole 22b toward the communication passage inlets 27a 'and 27b'. As can be seen from FIG. 2, the longest air column length is determined when the communication passage inlet is single. In comparison, it is clearly shortened. As a result, the minimum frequency of the refrigerant gas pulsation generated by the longitudinal vibration of the air column is higher than before, the lowest frequency pulsation and the resonance of the condenser of the air conditioning system refrigeration circuit are suppressed, and as a result, the refrigerant generated in the discharge chamber Noise of the air conditioning system refrigeration circuit caused by gas pulsation is suppressed.

Since the inlets 27a 'and 27b' of the communication passages 27a and 27b are opened at portions separated from each other in the discharge chamber surrounding wall, between the discharge hole 22b and the communication passage inlet 27a 'or 27b' close to the discharge hole. The maximum distance is reliably shortened compared to the maximum distance between the discharge hole and the communication path inlet in a conventional multi-cylinder reciprocating compressor with a single communication path and a single communication path inlet. Is done. As a result, the minimum frequency of the refrigerant gas pulsation is surely higher than before, and the lowest frequency pulsation and the resonance of the condenser of the air conditioning system refrigeration circuit are surely suppressed, and as a result, the refrigerant gas pulsation generated in the discharge chamber The noise of the air conditioner system refrigeration circuit is reliably suppressed.
The discharge chamber 19b may be communicated with the discharge port 21 via three or more communication paths.

The present invention is not limited to a swash plate compressor, and includes a plurality of cylinder bores, pistons that reciprocate within each cylinder bore, a suction chamber that communicates with the plurality of cylinder bores via a suction valve, and a suction port that communicates with the suction chamber. The invention can be applied to various reciprocating compressors including a discharge chamber communicating with the plurality of cylinder bores via a discharge valve and a discharge port communicating with the discharge chamber.

It is sectional drawing of the swash plate type compressor which concerns on the Example of this invention. It is an II-II arrow line view of FIG.

Explanation of symbols

A Variable displacement swash plate compressor 10 Drive shaft 11 Rotor 12 Swash plate 13 Link mechanism 14 Shoe 15 Piston 15a Head 16 Cylinder block 16a Cylinder bore 18 Front housing 19 Cylinder head 19b Discharge chambers 27a, 27b Communication passages 27a ', 27b' Aisle entrance

Claims (2)

A plurality of cylinder bores, a piston that reciprocates within each cylinder bore, a suction chamber that communicates with the plurality of cylinder bores via a suction hole and a suction valve, a suction port that communicates with the suction chamber, a discharge hole, and a discharge valve; A multi-cylinder reciprocation comprising: a discharge chamber communicating with the plurality of cylinder bores via a discharge port; and a discharge port communicating with the discharge chamber, wherein the discharge chamber communicates with the discharge port via a plurality of communication passages. Dynamic compressor. 2. The multi-cylinder reciprocating compressor according to claim 1, wherein the inlets of the plurality of communication passages open to portions of the discharge chamber surrounding wall that are separated from each other.

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