Exhaust cover of scroll compressor

Abstract

The utility model discloses a scroll compressor exhaust cover which comprises an exhaust cover body and a hollow oil separation cylinder, one end of the oil separation cylinder is located in an inner cavity of the exhaust cover body, the other end of the oil separation cylinder extends out of the exhaust cover body, an exhaust connector hole is formed in the end face of the oil separation cylinder, and an oil separation insertion pipe is inserted into the oil separation cylinder through the exhaust connector hole. An exhaust hole is formed in the outer wall, located in an inner cavity of the exhaust cover body, of the oil separation barrel, an oil return hole is formed in the exhaust cover body, a threaded bottom hole is formed in the outer wall of the exhaust cover body, and the threaded bottom hole is formed between the inner wall of the oil separation barrel and the oil return hole so as to communicate the inner cavity of the oil separation barrel with the oil return hole. A safety valve is in threaded connection in the threaded bottom hole. In the utility model, by changing the position of the threaded bottom hole of the safety valve, no extra structure is added, the original structure function is not lost, and the design freedom degree of the position of the vent hole joint hole is greatly increased. The design of a new fixed disc is avoided, and the additional machining procedures and tool clamps for machining the inclined holes are avoided.

Description

Technical Field

[0001] The utility model relates to an exhaust cover for a scroll compressor, belonging to the technical field of electric scroll compressors. Background Art

[0002] The scroll compressor of automobile air conditioner has high requirements on the oil content of discharged high-pressure gas. If the oil content of refrigerant gas is too high, an oil film will be formed on the wall of condenser and evaporator tube, which will affect the heat exchange effect of automobile air conditioning system, resulting in reduced refrigeration efficiency, and even insufficient oil return of scroll compressor, causing wear and jam of dynamic and static scroll disks, thus reducing the service life of scroll compressor. Nowadays, more and more passenger cars require compressors to operate in heat pump conditions. The ambient temperature is low, the compatibility of oil and refrigerant becomes worse, and oil return becomes more difficult. Therefore, it is very necessary to design an oil separation mechanism for automobile air conditioner scroll compressor.

[0003] Reference Figure 1 and Figure 2 The working process of the oil separator is as follows: the oil-gas mixture discharged from the compressor exhaust chamber enters the exhaust port of the exhaust cover in the high-pressure chamber formed by the inner wall and the fixed plate, and flows in a rotational direction between the oil separator insert and the inner wall of the oil separator cylinder. The liquid particles in the mixture are thrown out by centrifugal force and gathered on the inner wall of the oil separator cylinder, and finally fall to the bottom of the oil separator cylinder. The refrigerant enters the small hole in the middle of the oil separator insert, is discharged from the exhaust joint port and enters the condenser, and the separated lubricating oil flows back to the back pressure chamber under the action of gas pressure. In order to avoid the situation where the compressor exhaust pressure is too high due to certain abnormal conditions, causing damage to the compressor, a safety valve is provided on the exhaust cover. The safety valve is connected to the high-pressure chamber formed by the inner wall and the fixed plate. When the pressure in the inner wall cavity exceeds the safety value, the air pressure will push open the safety valve, causing the pressure in the inner cavity to drop, thereby protecting the compressor.

[0004] When designing compressor solutions for different customers, we found a problem with the above design: different customers have different requirements for compressor appearance, but the required displacement is basically the same, that is, the mature compressor internal structure can be used in the design to meet customer needs by changing the outer shell. Figure 3, the position of the exhaust joint varies due to customer requirements, which is reflected in the design of the exhaust cover, that is, the values ​​of A, B, and C are different. Because the oil return hole is connected to the oil return hole on the fixed plate, and the position of the fixed plate has been fixed due to the design of other structures of the compressor, the position of the oil return hole cannot be changed. If it is changed, the fixed plate needs to be redesigned, which increases the cost. If the oil return function is to be completed, the inner wall of the oil separator cylinder needs to be connected to the oil return hole, but A, B, and C cannot be connected to the oil return hole under certain values, resulting in the separated oil cannot return to the compressor. When the distance between the oil return hole and the inner wall of the exhaust hole oil separator is small, an oblique hole can be drilled to connect them, but the processing requires additional tooling and fixtures. When the distance between the two is large, it is impossible to connect them by processing the oblique hole, and there is room for improvement. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing automobile air-conditioning compressor exhaust cover exhaust joint hole position has a small degree of freedom in design. When the inner wall of the oil separator cylinder and the oil return hole can be connected by processing an inclined hole, it is necessary to increase the processing steps and tooling fixtures.

[0006] In order to solve the above technical problems, the utility model provides a scroll compressor exhaust cover, which can increase the design freedom of the exhaust hole without changing the oil separation design and the fixed plate design, reduce the processing difficulty, reduce the processing steps, and avoid adding tooling fixtures.

[0007] In order to achieve the above technical objectives and the above technical effects, this application is implemented through the following technical solutions:

[0008] A scroll compressor exhaust cover comprises an exhaust cover body and a hollow oil separator cylinder, one end of the oil separator cylinder is located in the inner cavity of the exhaust cover body, the other end of the oil separator cylinder extends out of the exhaust cover body and an exhaust joint hole is opened on the end surface, an oil separator insert is inserted into the oil separator cylinder through the exhaust joint hole, an exhaust hole is arranged on the outer wall of the oil separator cylinder located in the inner cavity of the exhaust cover body, an oil return hole is arranged on the exhaust cover body, a threaded bottom hole is opened on the outer wall of the exhaust cover body, the threaded bottom hole is arranged between the inner wall of the oil separator cylinder and the oil return hole to connect the inner cavity of the oil separator cylinder and the oil return hole, and a safety valve is threadedly connected in the threaded bottom hole.

[0009] Preferably, the threaded bottom hole is arranged on the side wall of the exhaust cover body or on the top surface of the exhaust cover body.

[0010] Preferably, the oil separation insert is connected to the oil separation cylinder by interference fit.

[0011] Preferably, an O-ring is provided between the safety valve and the threaded bottom hole.

[0012] Preferably, the exhaust cover body is provided with a plurality of positioning pin holes and a plurality of bolt through holes.

[0013] The scroll compressor exhaust cover provided by the utility model has the following advantages:

[0014] 1. When the utility model is used, the threaded bottom hole position of the safety valve is changed without adding any additional structure. The safety valve is still connected to the high-pressure chamber and the pressure relief function still exists. Therefore, the original structural function is not lost, and the design freedom of the exhaust hole joint hole position is greatly increased.

[0015] 2. The scroll compressor exhaust cover of the utility model can be used universally for compressors with the same displacement, avoiding the need to design a new fixed plate and reducing development costs.

[0016] 3. The scroll compressor exhaust cover of the utility model avoids the additional processing steps and fixtures required for processing the inclined hole, is easy to process, reduces fixtures, and reduces processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an axial schematic diagram of the overall structure of the compressor exhaust cover in the prior art;

[0018] Figure 2 It is a cross-sectional schematic diagram of the overall structure of the compressor exhaust cover in the prior art;

[0019] Figure 3 It is a structural schematic diagram showing the positional relationship between the oil separator and the oil return hole on the compressor exhaust cover in the prior art;

[0020] Figure 4 It is an axial side schematic diagram of the overall structure of a scroll compressor exhaust cover with a threaded bottom hole on the side of the utility model;

[0021] Figure 5 It is a cross-sectional schematic diagram of the overall structure of a scroll compressor exhaust cover with a threaded bottom hole on the side of the utility model;

[0022] Figure 6 It is an axial side schematic diagram of the overall structure of a scroll compressor exhaust cover with a threaded bottom hole on the top surface of the utility model;

[0023] Figure 7 It is a cross-sectional schematic diagram of the overall structure of a scroll compressor exhaust cover with a threaded bottom hole on the top surface of the utility model;

[0024] In the figure:

[0025] 1-exhaust cover body; 11-oil return hole; 12-threaded bottom hole; 2-oil separator cylinder; 21-exhaust joint hole; 22-exhaust hole; 3-oil separator insert; 4-safety valve; 5-O-ring; 6-locating pin hole; 7-bolt through hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical personnel in the field without creative work are within the scope of protection of the present utility model.

[0027] Reference Figure 4-Figure 7 , a scroll compressor exhaust cover, comprising an exhaust cover body 1 and a hollow oil separator cylinder 2, the exhaust cover body 1 and the oil separator cylinder 2 are integrally injection molded, one end of the oil separator cylinder 2 is located in the inner cavity of the exhaust cover body 1, the other end of the oil separator cylinder 2 extends out of the exhaust cover body 1 and an exhaust joint hole 21 is opened on the end surface, an oil separator insert 3 is inserted in the oil separator cylinder 2 through the exhaust joint hole 21, the oil separator insert 3 is connected to the inner wall of the oil separator cylinder 2 by interference fit, an exhaust hole 22 is integrally molded on the outer wall of the oil separator cylinder 2 located in the inner cavity of the exhaust cover body 1, an oil return hole 11 is integrally molded on the exhaust cover body 1, a threaded bottom hole 12 is opened on the outer wall of the exhaust cover body 1, the threaded bottom hole 12 is arranged between the inner wall of the oil separator cylinder 2 and the oil return hole 11 to connect the inner cavity of the oil separator cylinder 2 and the oil return hole 11, a safety valve 4 is threadedly connected to the threaded bottom hole 12, and the safety valve 4 comes with an O-ring 5 to prevent air leakage from the exhaust cover.

[0028] By designing the threaded bottom hole 12 of the safety valve 4 between the inner wall of the oil separator cylinder 2 and the oil return hole 11, the inner wall of the oil separator cylinder 2 and the oil return hole 11 are connected through the threaded bottom hole 12, so that the separated lubricating oil returns to the back pressure chamber of the compressor. No new structure is introduced and no additional process steps are added, but the design freedom of the exhaust joint hole 21 is increased. The safety valve 4 is still connected to the high-pressure chamber, and the pressure relief function still exists.

[0029] Reference Figure 4-Figure 7 The threaded bottom hole 12 can be opened on the side wall of the exhaust cover body 1, or on the top surface of the exhaust cover body 1, or at other reasonable angles (not shown in the figure), further improving the overall adaptability and practicality of the exhaust cover.

[0030] Reference Figure 4 and Figure 6 The exhaust cover body 1 is provided with a plurality of positioning pin holes 6 and a plurality of bolt through holes 7 to facilitate the positioning and installation of the exhaust cover body 1 .

[0031] The above is only a preferred embodiment of the utility model, and is not any formal or substantial limitation of the utility model. It should be pointed out that ordinary technicians in this technical field can make some improvements and supplements without departing from the utility model, and these improvements and supplements should also be regarded as the protection scope of the utility model. Any technician familiar with this profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the spirit and scope of the utility model, which are all equivalent embodiments of the utility model; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A scroll compressor exhaust cover, comprising an exhaust cover body (1) and a hollow oil separator cylinder (2), wherein one end of the oil separator cylinder (2) is located in the inner cavity of the exhaust cover body (1), the other end of the oil separator cylinder (2) protrudes from the exhaust cover body (1) and an exhaust joint hole (21) is opened on the end surface, an oil separator insert (3) is inserted into the oil separator cylinder (2) through the exhaust joint hole (21), an exhaust hole (22) is arranged on the outer wall of the oil separator cylinder (2) located in the inner cavity of the exhaust cover body (1), and an oil return hole (11) is arranged on the exhaust cover body (1), characterized in that: A threaded bottom hole (12) is provided on the outer wall of the exhaust cover body (1). The threaded bottom hole (12) is arranged between the inner wall of the oil separator cylinder (2) and the oil return hole (11) to connect the inner cavity of the oil separator cylinder (2) and the oil return hole (11). A safety valve (4) is connected to the inner thread of the threaded bottom hole (12).

2. A scroll compressor exhaust cover according to claim 1, characterized in that: The threaded bottom hole (12) is arranged on the side wall of the exhaust cover body (1) or on the top surface of the exhaust cover body (1).

3. A scroll compressor exhaust cover according to claim 1, characterized in that: The oil separation insert (3) is connected to the oil separation cylinder (2) by means of interference fit.

4. A scroll compressor exhaust cover according to claim 1, characterized in that: An O-type sealing ring (5) is provided between the safety valve (4) and the threaded bottom hole (12).

5. A scroll compressor exhaust cover according to claim 1, characterized in that: The exhaust cover body (1) is provided with a plurality of positioning pin holes (6) and a plurality of bolt through holes (7).

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