JP3207032B2 - 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 in, for example, a vehicle air conditioner. More specifically, the present invention relates to an improved discharge chamber gas guide structure that can suppress the accumulation of lubricating oil in a discharge chamber that temporarily stores gas discharged from a compression chamber through a discharge port.

[0002]

2. Description of the Related Art Generally, in a scroll compressor, a substrate 21 is provided inside a housing 20 as shown in FIG.
a fixed scroll 21 in which a spiral portion 21b is formed at a right angle to a
Is housed. A rotary shaft 23 is supported on the front housing 22, and an eccentric shaft 24 is connected to the shaft 23. Further, the eccentric shaft 24 supports a movable scroll 25 in which a spiral portion 25b is formed at a right angle on a substrate 25a. The fixed and movable scrolls 21 and
5 is superimposed so that the spiral portions 21b and 25b mesh with each other at an angle, and the side walls are in contact with each other to form a sealed compression chamber P between the spiral portions. A mechanism 26 is provided between the movable scroll 25 and the housing 20 to prevent the movable scroll 25 from rotating around its own axis.
Is provided. When the rotary shaft 23 is rotated to cause the eccentric shaft 24 to make a circular orbital motion, the orbiting scroll 25 makes a circular orbital motion of a predetermined radius around the central axis of the rotary shaft 23 to move the compression chamber P to the center of the spiral part. It is configured to move in a direction with a decrease in volume to perform a unidirectional gas compression action. (See Japanese Utility Model Publication No. 2-1507) In the above-mentioned scroll compressor, the fixed scroll substrate 2
A discharge chamber 27 is defined between the housing 1 and the rear wall of the housing 20.
a is formed. The discharge chamber 27 of the substrate 21a
A baffle plate 28 for guiding the refrigerant gas discharged from the discharge port 21c to the discharge chamber 27 downward is attached to the side surface.

[0003]

However, in the conventional scroll compressor, it is possible to prevent the lubricating oil from staying at the bottom in the discharge chamber 27, but the discharge is discharged from the discharge port 21c with discharge pulsation. When the refrigerant gas hits the inner surface of the baffle plate 28 and moves below the discharge passage 29, there is a problem that noise is generated. That is, the discharge passage 2
9 is a narrow space when viewed from the entire discharge chamber 27, so that even if high-pressure refrigerant gas is discharged here, there is no noise reduction function, and there is a problem that noise due to discharge pulsation increases. This noise is generated in the engine room in the vehicle air conditioner and is transmitted to the vehicle interior, thereby giving the passenger discomfort.

Further, since the above-mentioned conventional compressor requires a baffle plate and a bolt for attaching the baffle plate to the substrate 21a, the number of parts is increased, assembling work is required, and the manufacturing cost of the compressor can be reduced. There was also a problem that it could not be done.

On the other hand, in the above-mentioned conventional example, there has been proposed an arrangement in which a baffle plate for partitioning the discharge chamber 27 into front and rear chambers is accommodated, and a discharge passage is provided below the baffle plate. But,
Also in this structure, since the discharge chamber 27 is divided into two narrow spaces, there is a problem that the noise reduction function cannot be improved.

A conventional scroll type compressor disclosed in Japanese Patent Application Laid-Open No. Sho 60-1396 has been proposed.
In this compressor, an arc-shaped partition wall 30 is provided in a discharge chamber 27 as shown in FIG.
A and 27B, and a passage 31 is provided on both left and right sides of the partition wall 30.

In this compressor, the gas discharged from the discharge port 21c is supplied to the lower discharge chamber 2 by the arc-shaped partition wall 30.
7B, but moves upward from the narrow passage 31 thereafter, so that the flow velocity of the gas decreases at the bottom of the discharge chamber 27B, the lubricating oil is separated from the gas, and the oil stays at the bottom. There is a problem. In addition, since the entire discharge chamber is divided into two upper and lower chambers, there is a problem that a silencing effect cannot be expected.

A first object of the present invention is to solve the above-mentioned problems in the prior art, to prevent the lubricating oil from staying in the discharge chamber, and to reduce noise due to discharge pulsation. It is another object of the present invention to provide a scroll compressor which can reduce the cost of products by eliminating the need for assembling work.

It is a second object of the present invention to provide a scroll compressor which can more reliably prevent the lubricating oil from staying in the discharge chamber in addition to the first object.

It is a third object of the present invention to provide a scroll compressor in which, in addition to the first object, the gas in the discharge chamber is rectified to further suppress noise.

[0011]

According to a first aspect of the present invention, there is provided a scroll compressor having a discharge chamber for accommodating a compressed gas discharged from a discharge port in a housing. A discharge port is provided at an upper portion of a housing forming the discharge chamber, and the housing is
Taking the means of integrally formed a projection to guide the gas in the inner side wall of the grayed down the discharge chamber.

According to a second aspect of the present invention, in order to achieve the second object, in the first aspect, the ridge is formed in an inverted U-shape, and the ridges on both left and right sides are tapered to approach the lower end. It takes the means to form.

[0013] Further, the invention according to claim 3 is the third invention.
In order to achieve the object, in claim 1, means for forming the ridge radially is adopted.

[0014]

According to the first aspect of the present invention, when the refrigerant gas compressed in the compression chamber is discharged from the discharge port to the discharge chamber with discharge pulsation, the discharge chamber becomes one space, so that the muffler effect is provided. And noise is suppressed. In addition, a part of the refrigerant gas is guided downward by a ridge provided on the inner wall of the rear housing, flows to the bottom of the discharge chamber, and then flows upward. At the same time, it is carried from the discharge chamber to an external pipeline. Therefore, the amount of the lubricating oil can be reduced without reducing the volume of the discharge chamber due to the accumulation of the lubricating oil and reducing the muffler effect.

According to the first aspect of the present invention, the ridges are integrally formed on the inner wall of the rear housing, so that the strength of the rear housing can be improved. According to the second aspect of the present invention, the flow rate of the gas flowing downward due to the ridge is increased at the bottom of the discharge chamber, so that the retention of the lubricating oil at the bottom can be more reliably prevented. In particular, when the compressor is operated at a low speed, the lubricating oil in the gas is separated and easily stays at the bottom of the discharge chamber, which is convenient for preventing this.

Further, according to the third aspect of the present invention, since the projections are formed radially on the rear housing, the flow direction of the gas in the discharge chamber is divided into a plurality of rectifications, so that the noise can be more reliably suppressed. Done in

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 3, a front housing 2 is joined and fixed to a fixed scroll 1 also serving as a center housing 1d. A rotating shaft 3 is rotatably supported in the front housing 2 by a radial bearing, and an eccentric shaft 4 is fixed to the rotating shaft 3.

A balance weight 5 and a bush 6 are rotatably supported on the eccentric shaft 4. A movable scroll 7 is rotatably supported on the bush 6 via a radial bearing 8 so as to correspond to the fixed scroll 1. The fixed scroll 1 includes a substrate 1a, a spiral part 1b integrally formed at right angles to the substrate, and a center housing 1d. The movable scroll 7 has a substrate 7a.
And a spiral portion 7b integrally formed on the substrate at a right angle, and a boss portion 7c integrally formed on the back surface of the substrate 7a and fitting the bush 6. The spiral portions 1b and 7b are engaged with each other at an angle shifted from each other, and are overlapped so that a plurality of hermetically sealed compression chambers P are formed between the spiral portions 1b and 7b by contacting the side walls. Rotation between the movable scroll substrate 7a and the inner wall of the front housing 2 to prevent rotation of the movable scroll 7 about its own axis and to set a radius of circular orbital movement around the axis of the rotation axis. A blocking mechanism 9 is interposed. A suction chamber S is formed outside the spiral portions 1b and 7b.

A rear housing 10 forming a discharge chamber D is joined to the rear end surface of the center housing 1d and fixed by bolts (not shown). A discharge port 10a for guiding high-pressure refrigerant gas to an external conduit (not shown) is formed in an upper portion of the rear housing 10. The discharge chamber D
Is communicated with the compression chamber P at the end of the compression stroke by a discharge port 1c formed at the center of the substrate 1a . The discharge port 1c is opened and closed by a discharge valve 11. Further, the valve 1
In 1, the maximum open position is regulated by the retainer 12.

Next, the main part of the present invention will be described.
As shown in FIGS. 1 and 2, on the inner wall surface of the rear housing 10, a ridge 10b for guiding a part of the refrigerant gas discharged from the discharge port 1c to the discharge chamber D downward is formed integrally with the rear housing 10 in a circular shape. It is formed in an arc shape. This ridge 10b
A predetermined gap G is formed between the distal end surface of the fixed scroll substrate 1a and the fixed scroll substrate 1a.

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 or the like in FIG.
The orbiting scroll 7 performs a circular orbital motion at a predetermined radius in a state where the orbiting scroll 7 is prevented from rotating by the rotation preventing mechanism 9 by the bush 6. At this time, the refrigerant gas taken into the compression chamber P from the suction chamber S is reduced in volume as it goes to the center, is pushed out of the discharge valve 11 from the discharge port 1c, and is discharged to the discharge chamber D. The refrigerant gas in the discharge chamber D is supplied to the rear housing 10.
Is discharged to an external conduit from a discharge port 10a provided in the upper part of the container.

In the first embodiment, the rear housing 10
The projection 10b is formed on the inner wall surface of the discharge port 1c.
A part of the refrigerant gas discharged from the nozzle is guided downward by the ridge 10b. After this gas collides with the bottom of the discharge chamber D ,
Flows toward upper discharge port 10a is positioned, the space 1 between the right and left side end and the inner circumferential wall surface of the rear housing 10 of the projection 10b
3 (the portion with the largest passage area) and the discharge port 10a
To the external pipeline. Therefore, the flow of the refrigerant gas always occurs at the bottom of the discharge chamber D during the compression operation, and the lubricating oil does not stay at the bottom. Therefore, the lubricating oil is sufficiently supplied to the mechanism for driving the movable scroll 7 of the compressor, and the lubricity is improved. Further, since the volume of the discharge chamber D does not decrease due to the lubricating oil and the discharge chamber D is not divided into a plurality of independent chambers by the ridges 10b, the muffler effect of the discharge chamber D is ensured. In addition, noise due to discharge pulsation is efficiently reduced. That is, a part of the gas discharged from the discharge port 1c to the discharge chamber D flows above the discharge chamber D through the gap G between the ridge 10b and the substrate 1a. For this reason, the diffusion effect of the gas in the discharge chamber D increases, and an effect of suppressing noise can be expected.

Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, two ridges 1e are formed on the surface of the substrate 1a of the fixed scroll 1. In the process in which the gas guided downward by the ridge 10b on the side of the rear housing 10 moves upward , the ridge is formed.
So that meandering the flow of gas to overcome the 1e. For this reason, turbulence is less likely to occur due to the meandering gas, and the effect of suppressing noise increases.

Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the ridge 10 is used.
Protrusions 10c and 10d extending downward at both left and right end portions of b are formed integrally with the rear housing 10, respectively. or,
The interval between the two ridges 10c and 10d is tapered such that the distance between the ridges 10c and 10d decreases as going downward.

Accordingly, in this embodiment, the velocity of the refrigerant gas discharged from the discharge port 1c to the discharge chamber D is increased by the two ridges 10c and 10d in the process of being guided downward by the ridges 10c. As a result, the gas flow velocity at the bottom of the discharge chamber D is increased, and the effect of winding up the lubricating oil that tends to stay at the bottom at the bottom is ensured.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the ridge 10e formed on the rear housing 10 is formed radially. Also, a ridge 1f is provided on the back surface of the substrate 1a of the fixed scroll 1.
Are formed radially and integrally. Divided from this opportunity to signal 8
The gas discharged from the discharge port 1c
Since the sound is dispersed in the direction, the sound deadening effect is exhibited. And ridge
Gas entering each space partitioned by 1f and 10e
Overcomes the corresponding ridges 1f and 10e
Rectifying toward the upper discharge port 10a while meandering
Flows.

[0027]

As described in detail above, according to the first aspect of the present invention, it is possible to prevent the lubricating oil from staying in the discharge chamber, to reduce the noise due to the discharge pulsation, and to assemble. There is an effect that the cost can be reduced by eliminating the work.

Further, the invention according to claim 2 has an effect that, in addition to the effect of the invention according to claim 1, lubricating oil can be more reliably prevented from staying in the discharge chamber. further,
According to the third aspect of the invention, in addition to the effect of the first aspect of the invention, there is an effect that the gas in the discharge chamber is rectified to further suppress noise.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a scroll type compressor according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a rear housing.

FIG. 3 is a vertical sectional view of the scroll compressor.

FIG. 4 is a sectional view of a rear housing showing a second embodiment of the present invention.

FIG. 5 is an exploded perspective view of a rear housing and a fixed scroll according to a second embodiment.

FIG. 6 is a sectional view of a rear housing showing a third embodiment of the present invention.

FIG. 7 is an exploded perspective view of a rear housing and a fixed scroll according to a fourth embodiment.

FIG. 8 is a sectional view of a rear housing showing a fourth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a conventional scroll compressor.

FIG. 10 is a cross-sectional view passing through a discharge chamber of a conventional scroll compressor.

[Explanation of symbols]

1 ... fixed scroll, 1a ... substrate, 1c ... discharge port,
1d: center housing, 2: front housing, 7
... movable scroll, 10 ... rear housing, 10b, 1
0c, 10d, 10e: ridge, D: discharge chamber.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuya Yamaguchi 2-1-1 Toyotamachi, Kariya, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Shinji Takeda 1-1-1, Showacho, Kariya, Aichi Japan Japan Denso Uchi Co., Ltd. (72) Inventor Shigeru Hisaga 1-1-1, Showa-cho, Kariya, Aichi Japan Nippon Denso Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (3)

(57) [Claims] 1. A scroll type compressor having a discharge chamber for accommodating compressed gas discharged from a discharge port inside a housing, wherein a discharge port is provided on an upper portion of the housing forming the discharge chamber.
Rutotomoni, scroll compressor which is formed integrally with ridges to guide the gas in the inner side wall of the housing below the discharge chamber. 2. The scroll compressor according to claim 1, wherein said ridges are formed in an inverted U-shape, and ridges on both left and right sides are formed in a tapered shape approaching a lower end. 3. The scroll compressor according to claim 1, wherein said ridges are formed radially.