An electric scroll compressor with oil return structure

Abstract

The utility model relates to the field of electric scroll compressors, and discloses an electric scroll compressor with an oil return structure, including a cylinder body and a cylinder head. A frame is arranged in the cylinder body, an eccentric shaft is passed through the frame and is rotatably connected, a moving disk is rotatably connected to the eccentric shaft, a vortex line of the moving disk is meshed with a static disk, a ring body is fixedly connected in an annular groove on the back of the moving disk, a compression chamber is formed between the cylinder head and the static disk, an exhaust port is provided on the cylinder head, an air inlet port is provided on the static disk, an oil groove is provided on the frame, and an oil return hole is provided on the frame, so that the refrigerant oil in the high-pressure chamber flows back along the oil groove to the frame bearing to fully lubricate the upper parts. In the utility model, the refrigerant oil is continuously circulated inside the compressor to reach the parts that need lubrication and cooling, thereby ensuring the stable and safe operation of the compressor.

Description

Technical Field

[0001] The utility model relates to the field of electric scroll compressors, in particular to an electric scroll compressor with an oil return structure. Background Art

[0002] The electric scroll compressor is a positive displacement compressor. It is widely used in the field of new energy vehicles due to its simple structure, small size, smooth operation, low noise, high volumetric efficiency and high reliability. The scroll compressor realizes the compressor function mainly by a pair of meshing stator and moving plate. When the compressor is running, the moving plate revolves around a center relative to the stator to form three pairs of crescent-shaped compression chambers. The low-temperature and low-pressure gaseous refrigerant passes from the outside to the inside through these three pairs of compression chambers with shrinking volumes and is compressed into a high-temperature and high-pressure state. It is finally discharged from the three exhaust holes in the center of the stator and finally from the exhaust port on the cylinder head. A frame supporting the dynamic and static disk compression unit is provided on the back of the moving plate. Wear-resistant gaskets are provided between the moving plate and the frame, and wear-resistant gaskets are also provided between the bottom of the stator teeth and the top of the moving plate teeth.

[0003] Theoretically, when the moving and stationary disks are meshing, the tooth walls just touch each other, and the friction is very small at this time. However, due to the influence of processing accuracy, the friction will inevitably increase. When the compressor is running, the parts with relative motion will inevitably produce friction at the contact point, which will produce sound, heat and wear. These problems will affect the life and use effect of the compressor. In order to reduce the friction between the components, refrigeration oil is usually used to lubricate and cool the components. Due to gravity, the refrigeration oil will be more distributed in the lower part of the compressor. Uneven distribution of refrigeration oil will cause the upper parts to not be fully lubricated, affecting the life of the compressor and even causing safety hazards. Therefore, an electric scroll compressor with an oil return structure is proposed to solve the above problems. Utility Model Content

[0004] In order to remedy the above deficiencies, the utility model provides an electric scroll compressor with an oil return structure, aiming to improve the problem in the prior art that the refrigeration oil is unevenly distributed, resulting in insufficient lubrication of the upper components and affecting the life of the compressor.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an electric scroll compressor with an oil return structure, including a cylinder body and a cylinder head, a frame is arranged in the cylinder body, an eccentric shaft is penetrated and rotatably connected in the frame, a moving plate is rotatably connected on the eccentric shaft, a vortex line of the moving plate is meshed with a stationary plate, a ring body is fixedly connected in an annular groove on the back of the moving plate, a compression chamber is formed between the cylinder head and the stationary plate, an exhaust port is provided on the cylinder head, an air inlet is provided on the stationary plate, an oil groove is provided on the frame, and an oil return hole is provided on the frame, so that the refrigerant oil in the high-pressure chamber can flow back along the oil groove to the frame bearing to fully lubricate the upper parts.

[0006] As a further description of the above technical solution:

[0007] The outer wall of the static plate is fixedly connected to the inner wall of the frame.

[0008] As a further description of the above technical solution:

[0009] The outer wall of the anti-cylindrical pin is slidably connected to the inner wall of the ring body.

[0010] As a further description of the above technical solution:

[0011] An annular groove is provided on the inner wall of the moving plate.

[0012] As a further description of the above technical solution:

[0013] The cylinder body is provided with a cylinder body air intake port.

[0014] As a further description of the above technical solution:

[0015] The frame is provided with an oil return hole.

[0016] The utility model has the following beneficial effects:

[0017] In the utility model, the refrigeration oil is made to circulate continuously inside the compressor, and reaches the upper parts that need to be lubricated and cooled under the action of pressure, thereby ensuring the stable and safe operation of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall split structure of an electric scroll compressor with an oil return structure proposed by the utility model;

[0019] Figure 2 This is a rear view structural schematic diagram of a moving plate of an electric scroll compressor with an oil return structure proposed by the utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of a stator disk of an electric scroll compressor with an oil return structure proposed by the utility model;

[0021] Figure 4 This is a schematic cross-sectional structure diagram of an electric scroll compressor with an oil return structure proposed by the utility model;

[0022] Figure 5 This is a schematic diagram of a top view structure of an anti-cylindrical pin of an electric scroll compressor with an oil return structure proposed by the utility model;

[0023] Figure 6This is a schematic diagram of the cross-sectional structure of an oil return hole of an electric scroll compressor with an oil return structure proposed by the utility model;

[0024] Figure 7 This is a schematic diagram of a top view of the oil return hole of an electric scroll compressor with an oil return structure proposed by the utility model;

[0025] Figure 8 This is a schematic diagram of the cross-sectional structure of an oil return hole of an electric scroll compressor with an oil return structure proposed by the utility model;

[0026] Fig. 9 The utility model is a schematic diagram of a frame top view of an electric scroll compressor with an oil return structure.

[0027] Legend:

[0028] 1. Cylinder air intake port; 2. Frame; 3. Static disk; 4. Air inlet; 5. Eccentric shaft; 6. Exhaust port; 7. Compression chamber; 8. Oil return hole; 9. Moving disk; 10. Back pressure chamber; 11. Static disk pressure relief hole; 12. Oil return hole; 13. Ring body; 14. Cylinder body; 15. Anti-cylindrical pin; 16. Cylinder head; 111. Oil tank. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Reference Figure 1-Figure 3 The utility model provides an embodiment: an electric scroll compressor with an oil return structure, including a cylinder body 14 and a cylinder head 16, a frame 2 is arranged in the cylinder body 14, the frame 2 is the supporting frame of the whole compressor, the cylinder body 14 is installed at the bottom of the frame 2, and has a cylinder body air intake port 1 for introducing the gas to be compressed, the cylinder body 14 is provided with a cylinder body air intake port 1, the inner wall of the frame 2 is penetrated and rotatably connected with an eccentric shaft 5, the eccentric shaft 5 is fixedly connected with a moving plate 9, so that the rotation of the eccentric shaft 5 drives the moving plate 9 to rotate, the vortex line of the moving plate 9 is meshed with the static plate 3, so that the moving plate 9 can perform a rotational motion with a certain rotation radius on the inner wall of the static plate 3, and the outer wall of the static plate 3 is fixedly connected to the inner wall of the frame 2.

[0031] Reference Figure 4-Figure 9An annular groove is provided on the inner wall of the movable plate 9, and a back pressure cavity 10 is provided on the inner wall of the movable plate 9. The inner wall of the movable plate 9 is designed with an annular groove and a back pressure cavity 10. These structures are helpful to control the pressure balance during the compression process and ensure the compression efficiency. A ring body 13 is fixedly connected in the annular groove on the back of the movable plate 9. A compression cavity 7 is formed between the cylinder head 16 and the static plate 3. An anti-cylindrical pin 15 is fixedly connected to the inner wall of the frame 2. The outer wall of the anti-cylindrical pin 15 is slidably connected to the inner wall of the ring body 13. In order to prevent the movable plate 9 from generating unnecessary self-rotation during rotation, the anti-cylindrical pin 15 and the ring body 13 are designed. The ring body 13 is fixed to the anti-cylindrical pin 15 by a sliding connection, thereby stabilizing the rotation of the movable plate 9.

[0032] Reference Figure 4-Figure 9 A compression chamber 7 is provided on the inner wall of the frame 2. The compression chamber 7 is provided on the inner wall of the frame 2 for collecting compressed high-pressure gas. An exhaust port 6 is provided on the frame 2. The exhaust port 6 is provided on the frame 2 for exporting the compressed gas. An air inlet 4 is provided on the static plate 3. An oil groove 111 is provided on the frame 2. An oil return hole 8 is provided on the frame 2, so that the refrigeration oil in the high-pressure chamber flows back along the oil groove 111 to the bearing of the frame 2 to fully lubricate the upper parts. A static plate pressure relief hole 11 is provided on the static plate 3. The air inlet 4 and the static plate pressure relief hole 11 are respectively used for gas suction and pressure relief when necessary, helping to maintain the pressure balance inside the system. An oil return hole 12 is provided on the frame 2. The oil groove 111 and the oil return hole 8 and the oil return hole 12 on the frame 2 are used for lubricating and cooling system components, collecting and reusing oil, effectively maintaining mechanical components, and extending the service life of the compressor.

[0033] Working principle: When the compressor is not running, the refrigeration oil is mainly stored at the bottom of the low-pressure chamber. When the compressor is running, as the refrigerant enters from the cylinder suction port 1, the refrigerant will roll up the refrigeration oil and enter the compression chamber 7 through the air inlet 4 matched by the frame 2 and the stator 3. The air inlet 4 is evenly distributed on both sides of the compression chamber 7. After compression, the mixture of refrigerant and refrigeration oil is discharged from the exhaust hole of the stator 3 to open the valve plate;

[0034] When passing through the oil-gas separation structure on the cylinder head 16, the refrigeration oil and the refrigerant are separated, the refrigerant is discharged from the exhaust port 6, and the refrigeration oil flows back to the compression chamber 7, and flows to the oil return hole 8 on the stator 3 due to gravity;

[0035] The refrigerant oil passes through the oil return hole 8 along the oil groove 111 on the frame 2 and the gasket of the frame 2 to reach the back pressure chamber 10 on the back of the moving plate 9 to lubricate the bearing. When the pressure in the back pressure chamber 10 is too high, the refrigerant oil passes through the static plate pressure relief hole 11 connected to the other end of the oil groove 111 of the frame 2 to reach the low pressure chamber on the back of the static plate 3. A part of the refrigerant oil flows directly back to the low pressure chamber at the bottom of the cylinder body 14 from the gap between the static plate 3 and the cylinder body 14;

[0036] A part of it flows back to the compression chamber 7 through the oil return hole 12 on the back of the stator 3. The refrigerant oil circulates continuously in the compressor through this oil return system, providing back pressure and reaching the parts that need cooling and lubrication, ensuring the normal operation of the compressor.

[0037] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric scroll compressor with an oil return structure, comprising a cylinder body (14) and a cylinder head (16), wherein a frame (2) is arranged in the cylinder body (14), an eccentric shaft (5) is passed through the frame (2) and is rotatably connected, a moving plate (9) is rotatably connected to the eccentric shaft (5), a scroll line of the moving plate (9) is meshed with a stationary plate (3), a ring body (13) is fixedly connected in an annular groove on the back of the moving plate (9), a compression chamber (7) is formed between the cylinder head (16) and the stationary plate (3), an exhaust port (6) is provided on the cylinder head (16), and an air inlet (4) is provided on the stationary plate (3), characterized in that: The frame (2) is provided with an oil groove (111), and the frame (2) is provided with an oil return hole (8), so that the refrigeration oil in the high-pressure chamber flows back along the oil groove (111) to the bearing of the frame (2) to fully lubricate the upper parts.

2. The electric scroll compressor with an oil return structure according to claim 1, characterized in that: The outer wall of the static plate (3) is fixedly connected to the inner wall of the frame (2).

3. The electric scroll compressor with an oil return structure according to claim 1, characterized in that: It also comprises an anti-cylindrical pin (15), the outer wall of which is slidably connected to the inner wall of the ring body (13).

4. The electric scroll compressor with an oil return structure according to claim 1, characterized in that: The inner wall of the moving plate (9) is provided with an annular groove.

5. The electric scroll compressor with an oil return structure according to claim 1, characterized in that: The cylinder body (14) is provided with a cylinder body air intake port (1).

6. The electric scroll compressor with an oil return structure according to claim 1, characterized in that: The frame (2) is provided with an oil return hole (12).

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