JP2611547B2 - 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 refrigerating apparatus.

[0002]

2. Description of the Related Art Conventionally, this kind of scroll type compressor is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-167084, and as shown schematically in FIG. A pair of scrolls F and O having projecting spiral bodies B and C are provided, and a low-pressure gas taken into a compression chamber A from a suction port L on the outer periphery of the spiral is compressed and a high-pressure gas is discharged from a discharge port H at the center of the spiral. Is discharged.

[0003]

By the way, in order to perform good compression with the above-mentioned compressor, the airtightness in the compression chamber A defined between the scrolls B and C of the two scrolls should be kept good. It is necessary to perform smooth sliding operation and prevent the temperature of the compressed gas from abnormally rising.

However, the end faces of the spiral bodies B and C and the end plates N and M
Since there is always a gap between the two scrolls F and O, the sliding portion G between the scrolls B and C is not formed because there is always a gap between the scrolls F and O. Good compression can be performed because gas leakage occurs, the spiral bodies B and C that come apart come into contact with each other with shock, and an abnormal sound is generated, or the gas leakage causes an abnormal rise in the intake gas temperature. The problem that disappears occurs.

[0005] In this case, it is considered that the oil mist floating in the casing is naturally mixed into the suction gas and a certain amount of oil is supplied to the sliding contact portion G between the spiral bodies B and C. At the same time, it is not possible to form a sufficient oil film to maintain the airtightness in the compression chamber A. It is also conceivable to open an oil injection hole for connecting an injection pipe of oil or the like to the end plate M of the scroll F. However, it is generally difficult to drill a hole in a scroll which is a high precision processed product.
There is a problem of high cost.

SUMMARY OF THE INVENTION It is an object of the present invention to be able to satisfactorily supply oil or the like guided from an injection pipe into a compression chamber, to form a sufficient oil film or the like on a sliding portion, to generate gas leakage or to occur at the time of recontact of a separated spiral body. An object of the present invention is to provide a scroll compressor capable of reducing abnormal noise and suppressing a rise in temperature of compressed gas.

[0007]

Therefore, in order to achieve the above object, a pair of scrolls 3 and 4 having spiral bodies meshing with each other are provided inside a casing 1, and a suction connected to a lower portion of the casing 1. A low-pressure gas sucked into the casing 1 through a pipe passes through a suction passage 25 and a suction port 13 at the outer periphery of the spiral to form a compression chamber 1 defined between the spiral bodies.
In a scroll compressor, the high-pressure gas taken into the compression chambers 1 and 12 and compressed in the compression chambers 11 and 12 is discharged from the discharge port 14 at the center of the spiral to the discharge pipe 16 through the high-pressure chamber 10. An injection pipe 24 for injecting oil or liquid refrigerant is connected to the side wall of the casing 1, and an outlet of the injection pipe 24 is connected to a suction passage 25 communicating with the suction port 13 in a flow direction of the suction passage 25. And opened.

As one specific structure for opening the injection pipe 24, the injection pipe 2
4 was connected to a side wall of the casing 1 via a joint pipe 24a, and an internal pipe 24b opened along the flow direction of the suction passage 25 was connected to the joint pipe 24a.

[0009]

The outlet of the injection pipe 24 is located in the casing 1 in a low-pressure gas atmosphere, and the outlet is opened along the flow direction of the suction passage 25. According to the flow rate of the suction gas flowing through the passage 25, the gas can be positively contained in the suction gas. As a result, the injection is reliable, the loss of the injection flow rate is small, effective injection is possible, and an oil film or a liquid film can be formed satisfactorily on the sliding contact portion of each spiral. Therefore, the airtightness in the compression chamber can be improved to reduce gas leakage, and furthermore, the impact interference between the spiral bodies can be mitigated by an oil film or the like, and the generation of abnormal sound can be prevented. Can be suppressed, and the processing can be performed more easily as compared with a scroll having a high-precision processed product in which an injection hole for oil or the like is opened.

[0010]

FIG. 1 shows a scroll type compressor used in a refrigerating apparatus. A spiral body 3b is protruded from a disc-shaped end plate 3a via a frame 2 on an inner upper portion of a closed casing 1. The fixed scroll 3 and the movable scroll 4 having a spiral plate 4b protruding from a head plate 4a are vertically arranged in a meshing state with each other.
A motor 6 having a drive shaft 5 is provided.

Each of the spiral bodies 3b, 4b is provided with a respective end plate 3a,
The spiral body 3a is formed in a spiral shape that matches a predetermined involute shape from the center to the outer periphery of the spiral body 3a.
Tip seals 3c and 4c that fill gaps in the vertical direction formed between the end plates 3a and 4a are fitted to the protruding tip sides of the b and 4b, respectively.

The fixed scroll 3 is fixedly supported on the upper mounting surface of the frame 2 via fixing bolts 30. On the other hand, the movable scroll 4 is freely rotatable by a thrust bearing 2a provided on the upper portion of the frame 2. I support it.

The movable scroll 4 is moved through a counter weight 7 integrally provided at the upper end of the drive shaft 5, a swing link 8 driven by the counter weight 7, and an Oldham ring 9 constituting a rotation preventing mechanism. The fixed scroll 3 is driven to revolve, and the low-pressure gas sucked into the casing 1 through a suction pipe connected to the lower part of the casing 1 passes through a suction passage 25 provided in the frame 2 and a suction port 13 at the outer periphery of the spiral. The high-pressure gas compressed in the compression chambers 11, 12 is taken into the compression chambers 11, 12 defined between the spiral bodies, and the high-pressure gas is discharged from the discharge port 14 at the center of the spiral to the discharge pipe 16 through the high-pressure chamber 10. ing. Incidentally, reference numeral 15 denotes a check valve.

With the above structure, an external oil separator for separating oil from the high-pressure gas taken out to the discharge pipe 16 and an external oil for storing the high-pressure liquid after the high-pressure gas is condensed are provided on the side wall of the casing 1. Is connected to an injection pipe 24 for injecting oil or liquid refrigerant, and an outlet of the injection pipe 24 is connected to the suction port 13.
An opening is formed in the suction passage 25 leading to the upper side so as to be directed upward along the flow direction of the suction passage 25.

More specifically, the injection pipe 24 is connected to a side wall of the casing 1 through a joint pipe 24a, and opens into the joint pipe 24a along the flow direction of the suction passage 25. Shaped internal tube 24b
And the outlet of the injection pipe 24 is opened by the internal pipe 24b.

In this way, the oil or liquid refrigerant guided through the injection pipe 24 can be positively contained in the suction gas at the flow rate of the suction gas flowing through the suction passage 25. An oil film or a liquid film can be formed satisfactorily on the sliding contact portion 4b. Therefore, the airtightness in the compression chambers 11 and 12 can be improved, the amount of gas leakage can be reduced, and the shock interference between the spiral bodies 3b and 4b can be reduced by an oil film or the like, and the generation of abnormal noise can be prevented. Also, the reduction in gas leakage can suppress the temperature rise of the compressed gas.

In addition, since the injection pipe 24 is connected to the side wall of the casing 1 and its outlet is simply opened to the suction passage 25, an injection hole for oil or the like is opened in the end plate 3a of the fixed scroll 3. The processing can be performed more easily than the ones.

[0018]

As described above, according to the present invention, the outlet of the injection pipe 24 is connected to the casing 1 in a low-pressure gas atmosphere.
And the outlet thereof is opened along the flow direction of the suction passage 25, so that the injection pipe 24 is not heated, and further, the oil or oil is promoted by the gas flow in the suction passage 25. Since the liquid refrigerant is guided to the suction port 13, the injection is reliable, the loss of the injection flow rate is small, and effective injection is possible. As a result, a sufficient oil film or liquid film can be formed on the sliding portion between the spirals, and it is possible to reduce the occurrence of gas leakage and abnormal noise generated when the separated spirals re-contact with each other, and to suppress a rise in the temperature of the compressed gas. , A good compression operation can be performed. Further, the processing can be performed more easily as compared with a scroll having an injection hole for oil or the like, which is a high precision processed product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a scroll compressor according to the present invention.

FIG. 2 is a schematic view of a conventional scroll compressor.

[Explanation of symbols]

 Reference Signs List 1 casing 3 fixed scroll 4 movable scroll 13 suction port 14 discharge port 24 injection pipe 24a coupling pipe 24b internal pipe 25 suction passage

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshio Izumiya 3-12 Chikushinmachi, Sakai-shi, Osaka Daikin Industry Co., Ltd. Sakai Plant Rinkai Plant (56) References JP-A-58-176490 (JP, A)

Claims (2)

(57) [Claims] 1. A low-pressure gas sucked into a casing 1 through a suction pipe connected to a lower portion of the casing 1 is provided inside the casing 1 with a pair of scrolls 3 and 4 having spiral bodies meshing with each other. , A suction chamber defined between the spiral bodies through a suction passage 25 and a suction port 13 at the outer periphery of the spiral.
The scroll-type compressor in which the high-pressure gas taken in the compression chambers 11 and 12 and taken out from the discharge port 14 at the center of the spiral through the high-pressure chamber 10 to the discharge pipe 16 is taken out from the casing. On one side wall,
While connecting the injection pipe 24 for injecting oil or liquid refrigerant, the outlet of the injection pipe 24 is
A scroll compressor, wherein an opening is provided in a suction passage 25 communicating with the suction port 13 along a flow direction of the suction passage 25. 2. An injection pipe 24 is connected to a side wall of the casing 1 via a joint pipe 24a, and an internal pipe 24b opening along the flow direction of the suction passage 25 is connected to the joint pipe 24a. 2. The scroll type compressor according to 1.