JPH04241702A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To increase the accuracy in both dimension and cylindricality of a scroll type fluid machine at the press-fitting part of a partitioning member on a casing top, to prevent a leak of high pressure gas, and to prevent both drop of performance of the fluid machine and an increase in a spill loss of oil. CONSTITUTION:An enlarged diameter part 20, which extends from a press-fitting part toward an outer discharging part (5) side, is formed through pipe expanding process at the press-fitting part of a partitioning member 3 of a casing top 2. Thus, the accuracy required in both dimension and cylindricality can be increased without increasing the number of work stages or losing the wall thickness. At the same time, a leak of the high pressure gas can be reduced, while a drop of the performance of the machine can be prevented. In addition, an oil return pipe 30, which extends toward the bottom side of a casing body 1, is provided in the partitioning member 3. Thus, it can be prevented that the oil is hoisted toward an outer discharging port 5 along the inner wall of the casing to 1 by means of a stepped part 21 resulted from the formation of the enlarged diameter part 20. Thus, the oil can surely be collected.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a scroll-type fluid machine, in particular, a casing top having an external discharge port is connected to an end of a casing body, and a casing top is divided into sections. The present invention relates to a scroll-type fluid machine in which a discharge chamber separated from the body is formed by press-fitting members.

0002

[Prior Art] Conventionally, this type of scroll type fluid machine was
This is disclosed in Japanese Patent Application Laid-Open No. 1-240787. As shown in FIG. 2, a casing top C having an external discharge port B is coupled to the upper end of the casing body A, and the opening side end of the casing top C is connected to the upper end of the casing body A. The end plate E of the fixed scroll D is press-fitted into the end plate E by, for example, shrink fitting, and a discharge chamber F separated from the body A is formed above the end plate E.

[0003] Furthermore, a movable scroll G is placed opposite to the fixed scroll D, and the movable scroll G is connected to a frame H.
A motor I is provided at the lower part of the frame H, and the movable scroll G is driven to revolve around the fixed scroll D by the drive of the motor I, so that both scrolls D,
During G, the refrigerant gas sucked from the low pressure chamber J is compressed, and the compressed refrigerant gas is discharged from the discharge hole K provided in the center of the fixed scroll D to the discharge chamber F, and then through the external discharge port B. The liquid is discharged into a discharge pipe L.

In FIG. 2, S is a demister, and M is an oil return pipe that extends vertically through the fixed scroll D and the frame H, and is discharged into the discharge chamber F together with the refrigerant gas. The oil separated from the refrigerant gas by the demister S is returned to the bottom side of the casing body A through the oil return pipe M. Further, a recess N is formed around the end of the oil return pipe M on the side of the discharge chamber F, and oil separated from the refrigerant gas is stored in the recess N, and dirt in the oil is precipitated and removed. ing.

[0005]

[Problem to be Solved by the Invention] However, in the above-mentioned scroll type fluid machine, the casing top C has conventionally been
For example, to produce a flat steel plate by deep drawing,
The accuracy of the inner diameter dimension of the casing top C at the press-fitted portion of the end plate E, that is, the accuracy of the cylindricity at the press-fitted portion is poor. When the end plate E is press-fitted into such a casing top C by shrink fitting, for example, the casing top
A gap remains partially at the press-fitting part of the end plate E in the single top C, and during operation, the high-pressure refrigerant gas in the discharge chamber F leaks to the low-pressure chamber J side in the fuselage A through the gap. , there was a problem that the performance of the compressor deteriorated.

Furthermore, since the inner wall of the casing top C extends smoothly upward from the press-fitting portion of the end plate E, it is separated from the refrigerant gas in the discharge chamber F.
The oil that flows through the peripheral edge of the end plate E into the recess N and returns to the low pressure chamber J through the oil return pipe M flows through the case during operation.
ascending along the inner circumferential wall of the thing C to the external discharge port B;
Since the oil is discharged into the discharge pipe L through the external discharge port B, there is also the problem of increased oil drainage.

The present invention was invented to solve the above problems, and its purpose is to improve the dimensional accuracy of the inner diameter at the press-fitted part of the partitioning member of the casing top, thereby reducing the flow of high-pressure fluid from the discharge chamber. The object of the present invention is to provide a scroll-type fluid machine that can prevent leakage and increase oil drainage.

[0008]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a casing top 2 having an external discharge port 5 is coupled to an end of a casing body 1, and this casing top 2 has an external discharge port 5. - A scroll-type fluid machine in which a partition member 3 is press-fitted into a casing top 2 to form a discharge chamber 4 partitioned from the body 1, wherein a part of the casing top 2 where the partition member 3 is press-fitted, It is characterized in that an enlarged diameter portion 20 is formed extending from the press-fitting portion toward the external discharge port 5 side, and an oil return pipe 30 extending toward the bottom side of the casing body 1 is provided in the partition member 3. It is something to do.

[0009]

[Operation] By forming the enlarged diameter portion 20 at the press-fitting portion of the casing top 2 into which the partitioning member 3 is press-fitted, the inner diameter dimension at the press-fitting portion of the casing top 2 formed by deep drawing, That is, the accuracy of the cylindricity of the press-fitted portion can be increased. Therefore, the partition member 3
When the partition member 3 is press-fitted into the press-fitted part of the casing top 2, no gap is created in the press-fitted part of the partition member 3. As a result, during operation, the high-pressure refrigerant gas in the discharge chamber 4 can be prevented from leaking from the press-fitted part of the partition member 3 to the low-pressure side in the casing body 1, thereby preventing performance degradation of the scroll-type fluid machine. I can do it.

Furthermore, since the enlarged diameter portion 20 is formed, a stepped portion is formed at the upper portion thereof relative to the inner wall of the casing top 2, so that the refrigerant gas is separated from the high pressure refrigerant gas within the discharge chamber 4. The oil accumulated on the peripheral edge of the partition member 3 flows along the inner wall of the casing top 2 to the external discharge port 5.
When the oil is about to be rolled up, the upper stepped part of the enlarged diameter part 20 acts as a resistance, and as a result, it is possible to reduce the amount of oil accumulated on the peripheral edge of the partition member 3 that is rolled up to the external discharge port 5. Oil can be reliably recovered through the oil return pipe 30, and an increase in oil drainage can therefore be prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The scroll-type fluid machine shown in FIG. 1 is a compressor for compressing refrigerant gas used for, for example, refrigeration. At the same time as the casing top 2 is connected, a partition member 3 consisting of a partition plate having a boss portion 31 is press-fitted into the open end of the casing top 2 by shrink fitting or the like, so that the partition member 3 is separated from the body 1. A discharge chamber 4 is formed above the partition member 3. Further, an external discharge port 5 is opened at one side of the upper part of the casing top 2.

Further, a fixed scroll 6 and a movable scroll 7 are provided in an upper and inner position of the casing body 1 in a vertically opposed manner via a frame 8, and a low pressure chamber 11 is provided at a lower position of the frame 8. A motor 9 having a drive shaft 91 interlocked with the movable scroll 7 is disposed in the low pressure chamber 11, and the movable scroll 7 revolves with respect to the fixed scroll 6 by the drive of the motor 9. By driving, the refrigerant gas sucked from the low pressure chamber 11 between the scrolls 6 and 7 is compressed, and the compressed refrigerant gas is discharged from the discharge port 61 formed in the center of the fixed scroll 6 to the opening of the boss portion 31. 31a and the discharge valve 32 into the discharge chamber 4, and through the external discharge port 5 into the external discharge pipe 12. Note that 41 is a bearing metal provided on the frame 8, and 13 is a suction pipe that opens on one side of the middle portion of the casing body 1 in the vertical direction.

[0013] In the scroll type compressor as described above, the partitioning member 3 is press-fitted into the casing top 2 through the external discharge port 5 from the press-fitting part.
In addition to forming an enlarged diameter portion 20 extending to the side, the partition member 3 is provided with an oil return pipe 30 extending to the bottom side of the casing body 1.

Specifically, as shown in FIG.
The enlarged diameter portion 20 is formed at the press-fitted portion of the partition member 3 on the opening side of the casing top 2 that is connected to the upper end of the casing body 1, and the casing top 2 is first deep-drawn. After forming the casing top 2 so that the inner diameter of the opening side end is slightly smaller than the outer diameter of the partitioning member 3, the partitioning member 3 is press-fitted into the opening side of the casing top 2. By the tube expansion process, an enlarged diameter part 20 is formed which extends from the press-fitted part toward the external discharge port 5 side. A stepped portion 21 is formed between the single top 2 and the inner diameter portion thereof. Further, the inner diameter of the enlarged diameter portion 20 is such that the partition member 3 can be shrink-fitted thereto. Since the enlarged diameter portion 20 is formed by tube expansion processing, the necessary dimensional accuracy can be obtained, and the enlarged diameter portion 20
The cylindricity of the partition member 3 can be improved.
When the casing top 2 is press-fitted into the press-fitted portion of the casing top 2 by shrink-fitting, no gap is created at the press-fitted portion. Therefore, during operation, high-pressure refrigerant gas can be prevented from leaking from the discharge chamber 4 to the low-pressure chamber 11 through the press-in part of the partition member 3, and a decrease in the performance of the compressor can be prevented.

Furthermore, since the enlarged diameter portion 20 is formed by tube expansion processing, and the inner diameter dimension accuracy of the press-fit portion is not achieved by cutting processing, it does not lead to an increase in the number of steps compared to the case where cutting processing is performed. Also, changes in wall thickness can be reduced.

Further, the partitioning member 3 is sloped downward from the boss portion 31 toward the peripheral edge, so that the oil separated from the high-pressure refrigerant gas in the discharge chamber 4 flows through the partitioning member 3.
At the same time, an oil return pipe 30 is provided at the peripheral edge of the partition member 3 to extend toward the bottom side of the casing body 1. That is, a through hole 34 having a recess 33 is formed on the opposite side of the external discharge port 5 in the partitioning member 3, and a through hole 62 concentric with the through hole 34 is formed in the fixed scroll 6 and the frame 8. The through hole 34 and the through hole 62 are formed so that the through hole 3
The oil return pipe 30 made of a small diameter capillary tube is inserted and supported through a bush 35 that fits into the partition member 3, and the upper end of the oil return pipe 30 is opened at a position slightly lower than the upper surface of the partition member 3. let As a result, dirt in the oil is precipitated in the recess 33, and oil accumulated on the peripheral edge of the partition member 3 is removed from the casing body 3 through the oil return pipe 30.
It should be returned to the bottom side.

Note that there is an oil supply passage 9 inside the drive shaft 91.
2 is provided, and oil is supplied from an oil reservoir (not shown) provided on the bottom side of the casing body 1 through the oil supply passage 92 to the sliding contact portions of the scrolls 6 and 7 and the bearing provided in the frame 8. I try to refuel metal 41 etc.

[0018] When constructed as described above, since the enlarged diameter portion 20 is formed by pipe expansion at the press-fitted portion of the casing top 2 into which the partition member 3 is press-fitted, the casing formed by deep drawing is The dimensional accuracy of the inner diameter dimension at the press-fitted portion of the top 2 is improved, and the accuracy of the cylindricity at the press-fitted portion can be increased. Therefore, when the partition member 3 is press-fitted into the press-fitted part of the casing top 2 by shrink-fitting, no gap is created in the press-fitted part of the partitioning member 3, and the high-pressure refrigerant in the discharge chamber 4 is heated during operation. This makes it possible to prevent gas from leaking into the low pressure chamber 11 through the press-fitted portion of the partitioning member 3.

Further, the oil separated from the high-pressure refrigerant gas in the discharge chamber 4 accumulates at the peripheral edge of the partition member 3 and is returned to the bottom side of the casing body 1 via the oil return pipe 30. However, the oil collected at the peripheral edge of the partition member 3 is rolled up along the inner wall of the casing top 2 to the external discharge port 5. However, since the stepped portion 21 is formed at the upper end of the enlarged diameter portion 20, the oil rolled up along the inner wall of the casing top 2 is resisted by the stepped portion 21. Therefore, it is possible to reduce the amount of oil going up to the external discharge port 5. Therefore, the oil can be reliably recovered to the bottom side using the oil return pipe 30, and an increase in the amount of oil can be prevented. In addition, since the stepped portion 21 can reduce the amount of oil swirling up, oil is always present in the recess 33 during operation. communicates,
It is possible to prevent the high pressure gas from blowing through into the low pressure chamber 11, and it is also possible to prevent performance deterioration due to the high pressure gas blowing through. Note that when a demister or the like that actively separates refrigerant gas and oil is provided in the discharge chamber 4, the amount of oil accumulated at the peripheral edge of the partition member 3 increases, so that the effect of preventing an increase in oil buildup becomes even more obvious. It will appear.

In the above embodiment, a partition plate having the boss portion 31 is used as the partition member 3, but the end plate of the fixed scroll 6 may also be used.

[0021]

As explained above, the present invention connects the casing top 2 having the external discharge port 5 to the end of the casing body 1, and also provides partitions in the casing top 2. A scroll-type fluid machine in which a member 3 is press-fitted to form a discharge chamber 4 partitioned from the body 1, and the partitioning member 3 is press-fitted into the casing top 2 at the press-fitted part, and the external part is formed from the press-fitted part. An enlarged diameter portion 20 extending toward the discharge port 5 side is formed, and the partition member 3 is provided with the case.
Since the oil return pipe 30 extending to the bottom side of the casing body 1 is provided, even if the casing top 2 into which the partition member 3 is press-fitted is formed by deep drawing, there is no need for an additional process, and the wall thickness can be reduced. This reduces the decrease in the inner diameter dimension of the casing top 2 at the press-fitting site, and improves the accuracy of the inner diameter dimension at the press-fitting site. Therefore, the partition member 3 is connected to the casing top 2.
When the refrigerant gas is press-fitted into the press-fitted part of the partition member 3, no gap is created in the press-fitted part of the partition member 3, and as a result, the high-pressure refrigerant gas in the discharge chamber 4 is prevented from leaking from the press-fitted part of the partition member 3 during operation. This makes it possible to prevent a decline in the performance of the scroll-type fluid machine.

Furthermore, since the enlarged diameter portion 20 is formed, a stepped portion is formed at the upper part of the enlarged diameter portion 20 relative to the inner wall of the casing top 2, so that high pressure is generated within the discharge chamber 4. When the oil that is separated from the refrigerant gas and accumulates on the peripheral edge of the partition member 3 attempts to rise to the external discharge port 5 along the inner wall of the casing top 2, it is resisted by the stepped portion, so that the oil The amount of oil being rolled up to the external discharge port 5 can be reduced, and the oil can be more reliably recovered to the bottom side by the oil return pipe 30, thereby preventing an increase in the amount of oil coming up.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view of a scroll-type fluid machine according to the present invention.

FIG. 2 is a sectional view showing a conventional example.

[Explanation of symbols]

1 Casing body 2 Casing top ３　　　　　　　Dividing members 4 Discharge chamber 5 External discharge port 20 Expanded diameter part 30 Oil return pipe

Claims (1)

[Claims] Claim 1: A casing top 2 having an external discharge port 5 is coupled to an end of a casing body 1, and a partition member 3 is press-fitted into the casing top 2. This is a scroll-type fluid machine having a discharge chamber 4 partitioned into a section, in which a diameter enlarged part 20 is provided at a press-fitting part of the partitioning member 3 in the casing top 2 and extending from the press-fitting part towards the external discharge port 5 side. A scroll type fluid machine characterized in that the partition member 3 is provided with an oil return pipe 30 extending to the bottom side of the casing body 1.