JP3206221B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for a vehicle air conditioner, for example.

[0002]

2. Description of the Related Art Generally, a scroll compressor is provided with a scroll compression element formed by fitting a fixed scroll body and an orbiting scroll body in a center housing, and compresses the refrigerant gas sucked into the center housing. Compressed by the element and discharged from the discharge port to one discharge chamber formed in the rear housing.

In this scroll compressor, the scroll compression element repeatedly increases and decreases the volume, and supplies compressed refrigerant gas from the discharge port to the discharge chamber, so that discharge pulsation occurs. This discharge pulsation is attenuated to some extent because the large discharge chamber in the rear housing functions as a hollow silencer. In order to further suppress discharge pulsation, a scroll compressor disclosed in Japanese Patent Application Laid-Open No. 59-60098 has been proposed. In this compressor, a rear housing that forms a discharge chamber is provided on the rear surface of the substrate of the fixed scroll body, and a muffling chamber is formed facing a discharge path that communicates with the discharge chamber. When the compressed refrigerant gas is discharged from the discharge port to the discharge chamber, the gas expands in the discharge chamber, thereby exhibiting a silencing effect. During the transfer from the discharge chamber to the outside through the discharge path, the noise is reduced. It is expanded again by the chamber, and the sound deadening effect is exhibited.

[0004]

In the above-mentioned conventional scroll type compressor, since the rear housing forming one discharge chamber is formed at the rear end of the compressor, the overall length of the compressor in the axial direction is large. Therefore, there is a problem that the size of the compressor cannot be reduced.

A first object of the present invention is to solve the above-mentioned problems in the prior art, suppress the discharge pulsation of the refrigerant gas discharged from the compression chamber to the discharge chamber, and reduce the noise. Another object of the present invention is to provide a scroll compressor in which the overall length in the axial direction of the compressor is shortened so that the compressor can be reduced in size and weight.

A second object of the present invention is to provide, in addition to the first object, a scroll type compression which can further suppress discharge pulsation of refrigerant gas discharged from the compression chamber to the discharge chamber to reduce noise. To provide machines.

A third object of the present invention is to provide, in addition to the first or second object, a scroll type compression which can secure the volume of the second discharge chamber without increasing the outer diameter of the compressor. To provide machines.

[0008]

According to a first aspect of the present invention, there is provided a fixed scroll body provided in a center housing, wherein the fixed scroll body is opposed to the fixed scroll body and cannot rotate and revolves. A closed compression chamber whose volume decreases from the outer peripheral side toward the center based on the revolution of the orbiting scroll body is formed between the orbiting scroll body and the orbiting scroll body provided at the center of the substrate of the fixed scroll body. In a scroll compressor configured to discharge a compressed refrigerant gas from a discharge port to a discharge chamber formed in a rear housing, the rear housing is partially disposed on a back surface of a fixed scroll body so as to include the discharge port. Forming
A first discharge chamber is formed in the rear housing, a sub-housing is provided on the outer peripheral side of the center housing, and a second discharge chamber communicating with the first discharge chamber via a communication passage is provided in the sub-housing. The second discharge chamber has means for forming a discharge port.

According to a second aspect of the present invention, in the first aspect, the first discharge chamber communicates with a discharge port through a discharge passage, and the discharge passage communicates with the second discharge chamber through the communication passage. Has taken.

Further, the invention according to claim 3 employs means according to claim 1 or 2, wherein a sub-housing forming the second discharge chamber is provided at a position corresponding to an outer end of the fixed spiral portion. .

[0011]

According to the first aspect of the present invention, the refrigerant gas compressed by the closed compression chamber formed by the fixed scroll body and the orbiting scroll body is pressure-fed from the discharge port to the first discharge chamber. Further, the refrigerant gas supplied to the first discharge chamber is pressure-fed to the second discharge chamber through the communication passage, and further supplied to the external refrigerant circuit from the discharge port.

Since the discharge of the refrigerant gas from the discharge port is performed intermittently, discharge pulsation occurs in the first discharge chamber. However, since the refrigerant gas pumped to the first discharge chamber expands, the pulsation is attenuated to some extent. Then, the refrigerant gas in the first discharge chamber is pressure-fed to the second discharge chamber through the communication passage and expands again, so that the discharge pulsation is further attenuated.
That is, the discharge pulsation damping effect is larger than that of a scroll compressor having one discharge chamber having the same large volume,
Noise is reduced.

According to the first aspect of the invention, the rear housing forming the first discharge chamber is partially provided on the rear surface of the substrate of the fixed scroll body, and the second discharge chamber is provided on the outer periphery of the center housing by the sub-housing. The axial dimension of the compressor of the rear housing can be reduced. This claim 1
The described invention has a greater discharge pulsation damping effect than the conventional scroll type compressor having only one discharge chamber as described above, so that the discharge chamber required to attenuate the same degree of discharge pulsation is required. The total volume can be small. For this reason, the rear housing and the sub-housing forming both discharge chambers are small and compact.
The weight can be reduced. Therefore, the overall length of the compressor in the axial direction can be reduced, and the entire compressor can be reduced in size and weight.

Further, according to the first aspect of the present invention, since the rear housing is partially provided on the rear surface of the substrate of the fixed scroll, deformation of the substrate of the fixed scroll due to the pressure in the discharge chamber is reduced.

According to the second aspect of the present invention, since the second discharge chamber functions as a resonance type attenuator, noise due to discharge pulsation can be further reduced as compared with the cavity type damping structure of the first aspect of the present invention. Can be improved.

Further, according to the third aspect of the present invention, since the sub-housing forming the second discharge chamber is provided at a position corresponding to the outer end of the fixed spiral part, the outer diameter of the compressor is increased. Without this, the volume of the second discharge chamber can be secured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the scroll compressor according to the present invention will be described below with reference to FIGS.

The fixed scroll body 1, which also serves as a center housing, comprises a substrate 1a, a fixed spiral part 1b formed integrally with the substrate 1a, and a center housing 1c formed integrally with the outer periphery of the substrate 1a. I have. A front housing 2 is joined and fixed to a front end surface of the center housing 1c. A rear housing 1e forming a first discharge chamber 14 to be described later is integrally formed on a rear end surface of the center housing 1c. A rotary shaft 3 is rotatably supported by a radial bearing 4 at the center of the front housing 2. ing. An eccentric shaft 5 is connected to the inner end of the rotating shaft 3, and a balance weight 6 and a bush 7 are fitted to the shaft 5. On the outer peripheral surface of the bush 7, a boss 8c integrally formed at the center of the substrate 8a of the orbiting scroll body 8 is supported by a radial bearing 9 so as to be relatively rotatable.

A rotation preventing mechanism 10 for preventing rotation of the orbiting scroll body 8 and permitting the orbiting operation is interposed between the inner wall surface of the front housing 2 and the substrate 8a of the orbiting scroll body 8. Have been. The orbiting scroll portion 8b is formed on the substrate 8a of the orbiting scroll body 8, and the two orbiting portions 1b and 8b are in contact at a plurality of locations as shown in FIG. The revolving motion of the orbiting scroll body 8 reduces the volume of the compression chamber P formed by the spiral portions 1b and 8b.
As a result, the refrigerant gas is taken in from the suction chamber 11 formed on the outer peripheral side of the spiral portions 1b and 8b, and is moved to the center side of the spiral portions 1b and 8b while reducing the volume. Further, the liquid is discharged into the rear housing 3 from a discharge port 1d formed at the center of the fixed scroll substrate 1a. A discharge valve 12 for opening and closing the discharge port 1d and a retainer 13 for regulating the opening and closing position are attached to the substrate 1a.

At the center of the fixed scroll substrate 1a, a rear housing 1e forming a first discharge chamber 14 surrounding the discharge valve 12 is integrally formed in a U-shape as shown in FIG. A rear end cover 15 is joined and fixed to an end surface of the housing 1e. A sub-housing 1f forming the second discharge chamber 16 is formed integrally with a part of the outer periphery of the center housing 1c. The second discharge chamber 16 is formed in the outer peripheral portion of the center housing 1c in a region corresponding to the outer end of the spiral portion 1b of the fixed scroll body 1. The first discharge chamber 14 and the second discharge chamber 1
6 is a communication passage 1 formed at the boundary between the two housings 1e and 1f.
7 are connected. This communication passage 17 is a throttle passage as shown in FIG. Further, a discharge port 15a is formed at an upper portion of the rear end cover 15, and discharges the refrigerant gas in the second discharge chamber 16 to an external refrigerant circuit.

Next, the operation of the scroll compressor constructed as described above will be described. When the rotating shaft 3 is rotated by the power of the engine, the eccentric shaft 5 and the bush 7
As a result, the orbiting scroll body 8 performs a orbital motion at a predetermined radius in a state where the orbiting scroll body 8 is prevented from rotating by the rotation preventing mechanism 10.
At this time, the refrigerant gas taken into the closed compression chamber P from the suction chamber 11 is reduced in volume toward the center, and
The discharge valve 12 is pushed out of the discharge port 1d provided at the position a to be discharged into the first discharge chamber 14. The refrigerant gas in the first discharge chamber 14 is guided to the second discharge chamber 16 through the throttle communication passage 17, and is further discharged from the second discharge chamber 16 to the external refrigerant circuit through the discharge port 15a.

Since the discharge from the discharge port 1d is performed intermittently, the refrigerant gas pressure in the first discharge chamber 14 also fluctuates, which causes discharge pulsation. However, since the refrigerant gas pumped to the first discharge chamber 14 expands, the pulsation is attenuated to some extent. Then, the refrigerant gas in the first discharge chamber 14 is pressure-fed to the second discharge chamber 16 through the communication passage 17 and expands again, so that the discharge pulsation is further attenuated. That is, as compared with a conventional scroll compressor having one discharge chamber having the same large volume, the effect of damping discharge pulsation is increased, and noise is reduced.

In the first embodiment, the rear housing 1e forming the first discharge chamber 14 is partially provided on the back surface of the substrate 1a of the fixed scroll body 1, and the second discharge chamber 16 is provided on the outer periphery of the center housing 1c. Since it is formed by the housing 1f, the axial dimension of the compressor of the rear housing 1e can be shortened. Also, as described above, since the discharge pulsation damping effect is greater than that of the conventional scroll type compressor having only one discharge chamber, both discharge chambers 14 and 14 required to attenuate the same degree of discharge pulsation are provided. The total volume of 16 is also small.
Further, the second discharge chamber 16 is provided with the spiral portion 1b of the fixed scroll body 1.
Since it is formed in a region corresponding to the outer end of the second discharge chamber, the volume of the second discharge chamber 16 can be secured without increasing the outer diameter of the compressor. For this reason, the rear housing 1e and the sub-housing 1f forming both the discharge chambers 14 and 16 are small and
The weight can be reduced. Therefore, the overall length of the compressor in the axial direction can be reduced, and the entire compressor can be reduced in size and weight.

Further, since the first discharge chamber 14 is partially formed on the back surface of the substrate 1a of the fixed scroll 1,
The deformation of the substrate 1a due to the discharge pressure in the discharge chamber 14 is reduced, and the two spiral bodies 1b, 8b are not strongly pressed by the substrates 1a, 8a.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the first discharge chamber 14 and the discharge port 15a communicate with each other through the discharge passage 18, and the discharge passage 18 and the second discharge chamber 16 communicate with each other through the communication passage 17. Therefore, in this embodiment, since the second discharge chamber 16 functions as a resonance type attenuator, noise reduction due to discharge pulsation can be further improved as compared with the cavity type damping structure of the above-described embodiment.
Other configurations and effects are the same as those of the first embodiment.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) Although not shown, the shape of the rear housing 1e forming the first discharge chamber 14 is set in a region where the pressure in the compression chamber P rapidly increases, that is, in a state where the compression chamber P starts to communicate with the discharge port 1d. Compression chamber P and both spiral parts 1 forming it
To be formed in a circular shape corresponding to b and 8b.

(2) Instead of the discharge valve 12 and the retainer 13, a ring-shaped discharge valve (not shown) is used. In this case, the size of the first discharge chamber 14 in the compressor axial direction can be further reduced.

(3) In FIG. 1, the discharge port 15a is formed on the outer periphery or the front side wall of the sub housing 1f.

[0029]

As described in detail above, the invention according to claim 1 suppresses the discharge pulsation of the refrigerant gas discharged from the compression chamber to the discharge chamber, thereby reducing the noise and the shaft of the compressor. By shortening the total length in the direction, the size and weight of the compressor can be reduced. In the first aspect of the present invention, since the rear housing is partially provided on the rear surface of the substrate of the fixed scroll, deformation of the substrate of the fixed scroll due to the pressure in the discharge chamber can be reduced.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the discharge pulsation of the refrigerant gas discharged from the compression chamber to the discharge chamber is further suppressed to further reduce noise. Can be.

Further, according to the third aspect of the present invention,
Or, in addition to the effects of the invention described in 2, the capacity of the second discharge chamber can be secured without increasing the outer diameter of the compressor.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a central portion of a scroll type compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed scroll body, 1a ... Substrate, 1b ... Fixed spiral part, 1c ... Center housing, 1d ... Discharge port, 1e
... Rear housing, 1f ... Sub housing, 2 ... Front housing, 8 ... Orbiting scroll body, 8a ... Substrate, 8
b: swirling spiral part, 12: discharge valve, 14: first discharge chamber, 1
5: rear end cover, 15a: discharge port, 16: second discharge chamber, 17: communication path, 18: discharge path, P: compression chamber.

Continuation of the front page (72) Inventor Akira Nakamoto 2-1-1 Toyota-cho, Kariya-shi, Aichi Toyota Motor Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (3)

(57) [Claims] 1. A revolving scroll body revolves between a fixed scroll body provided in a center housing and a revolving scroll body that is provided so as to be non-rotatable and revolvable facing the fixed scroll body. A closed compression chamber whose volume decreases from the outer peripheral side toward the center portion is formed based on the outer peripheral side, and compressed refrigerant gas is discharged from a discharge port formed in the center portion of the substrate of the fixed scroll body to a discharge chamber formed in the rear housing. In the scroll compressor configured to discharge, the rear housing is partially provided on a back surface of a substrate of a fixed scroll body so as to include the discharge port, and a first discharge chamber is formed in the rear housing. A sub-housing is provided on the outer peripheral side of the housing, and a second discharge chamber communicating with the first discharge chamber via a communication passage is provided in the sub-housing. Scroll compressor in which a discharge port in the outlet chamber. 2. The scroll compressor according to claim 1, wherein the first discharge chamber communicates with a discharge port through a discharge passage, and the discharge passage and the second discharge chamber communicate with each other through the communication passage. 3. The scroll compressor according to claim 1, wherein the sub-housing forming the second discharge chamber is provided at a position corresponding to an outer end of the fixed spiral part.