Lubricating oil circulation structure of scroll compressor

Abstract

The utility model discloses a lubricating oil circulation structure of a scroll compressor. The lubricating oil circulation structure comprises a shell, a driving motor, a compression part, a main bearing seat and a low-pressure cavity, an air suction pipe is arranged at the lower part of the shell; the compression part is arranged in the shell, and an air suction port is formed in the upper portion of the compression part. The main bearing seat is arranged below the compression part and supports the compression part; the low-pressure cavity is communicated with the air suction port through a communicating air passage; a refrigerating medium enters the low-pressure cavity through the air suction pipe and enters the compression part through the communicating air channel and the air suction port. Refrigerating media enter the low-pressure cavity in the compressor through the air suction port, then the refrigerating media enter the air suction port above the vortex part through the communicating air channel, an air suction loop is made to avoid a lubricating oil splashing area generated by relative movement of the thrust structure and the movable vortex plate, and the oil circulation rate is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of scroll compressors, and in particular relates to a scroll compressor lubricating oil circulation structure. Background Art

[0002] The scroll compressor includes a compression mechanism for compressing a working fluid (such as a refrigerant), and the compressor components include a movable scroll, a fixed scroll, a thrust structure and other components.

[0003] Generally, the oil circulation rate can be used to characterize the amount of lubricating oil carried by the working fluid and the degree of lubricating oil provided to the scroll. The oil circulation rate is the mass percentage of lubricating oil contained in the refrigerant discharged from the compressor. After the refrigerant enters the compressor, it intersects with the lubricating oil path inside the compressor, so that the airflow carries a certain amount of lubricating oil into the scroll. After lubricating the scroll, part of the lubricating oil is finally discharged from the compressor along with the refrigerant.

[0004] However, if the oil circulation rate is too high, the lubricating oil will accumulate on the inner surface of the heat exchanger, reducing the heat exchange efficiency of the system and the energy efficiency of the system; if the oil circulation rate is too high, it will also cause the risk of insufficient oil in the compressor; on the contrary, if the oil circulation rate is too low, there will be insufficient lubrication between the scrolls, and the probability of wear and failure of the scroll friction surface will increase. Therefore, the oil circulation rate of the compressor needs to be controlled at a relatively appropriate level to ensure the good operation of the system and the compressor.

[0005] Usually, the refrigerant medium of the compressor will pass through the thrust surface and the scroll disk and move relative to each other to produce a lubricating oil splashing area. The airflow will carry a certain amount of lubricating oil into the scroll, increasing the oil circulation and reducing the heat exchange efficiency of the system. In the long run, the compressor is at risk of insufficient oil storage. Utility Model Content

[0006] In order to solve the above technical problems, the utility model discloses a scroll compressor lubricating oil circulation structure, which physically isolates the compressor suction circuit from the thrust structure and the lubricating oil splashing area generated by the relative movement of the movable scroll, and the air circuit and the oil circuit do not cross to achieve extremely low oil circulation. The refrigerant medium enters the low-pressure cavity in the compressor from the suction port, and then the refrigerant medium passes through the connecting air channel and enters the suction port above the scroll part, achieving a low oil circulation rate.

[0007] Specifically, the utility model discloses a scroll compressor lubricating oil circulation structure, comprising: a housing, a driving motor, a compression part, a main bearing seat and a low-pressure cavity;

[0008] An air intake pipe is provided at the lower part of the shell;

[0009] The compression part is placed inside the shell, and an air inlet is provided above the compression part;

[0010] The main bearing seat is placed below the compression part to support the compression part;

[0011] The low-pressure cavity is connected to the air inlet via a connecting airway;

[0012] The refrigerant enters the low-pressure cavity through the suction pipe, and enters the compression part through the connecting airway and the suction port.

[0013] By adopting the above scheme, the refrigerant medium enters the low-pressure cavity in the compressor from the suction port, and then passes through the connecting air passage to enter the suction port above the vortex portion, so that the suction circuit avoids the lubricating oil splashing area caused by the relative movement of the thrust structure and the movable scroll, thereby reducing the oil circulation rate.

[0014] Furthermore, a lower air collecting hood is provided inside the shell, the lower air collecting hood is communicated with the air intake pipe, and the lower air collecting hood is interference connected with the outer diameter of the driving motor.

[0015] Furthermore, the major diameter of the main bearing seat matches the inner diameter of the housing.

[0016] Furthermore, the low-pressure cavity is composed of the main bearing seat, the shell, and the lower air collecting hood.

[0017] By adopting the above solution, the lower air collecting hood restricts the downward flow of the refrigeration airflow, and the main bearing seat restricts the upward flow of the refrigeration airflow, so that the refrigeration airflow in the low-pressure cavity enters the connecting airway.

[0018] Furthermore, an upper air collecting hood is provided in the shell, and the upper air collecting hood is provided above the driving motor and is interference fit with the outer diameter of the driving motor.

[0019] Furthermore, the upper air collecting hood is provided with an exhaust port which is connected with the connecting air passage.

[0020] Furthermore, the low-pressure cavity is composed of the upper air collecting hood, the shell, and the lower air collecting hood.

[0021] By adopting the above solution, an upper air collecting hood is arranged above the driving motor, which limits the upward flow of the refrigeration airflow. The exhaust port opened on the upper air collecting hood allows the refrigeration airflow in the low-pressure cavity to flow out and enter the air intake port through the connecting air duct.

[0022] Furthermore, a reinforcement portion is provided on the side wall of the main bearing seat, a guide portion is provided above the reinforcement portion and outside the compression portion, and the connecting air passage is opened on the side walls of the reinforcement portion and the guide portion.

[0023] By adopting the above solution, the communicating air passage is arranged inside the compressor, a reinforcement part is arranged on the outer circle of the main bearing seat, and the communicating air passage is opened on the side walls of the reinforcement part and the guide part, thereby saving space of the compressor.

[0024] Furthermore, the communicating air passage is arranged outside the shell.

[0025] By adopting the above solution, the communicating air passage is arranged outside the shell, which facilitates the disassembly, assembly and maintenance of the communicating air passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0027] Figure 1 is a cross-sectional view of the scroll compressor communicating air passage outside the casing;

[0028] Figure 2 is a cross-sectional view of another embodiment of a scroll compressor communicating air passage outside a housing;

[0029] Figure 3 is a cross-sectional view of the scroll compressor communicating air passage inside the shell;

[0030] Figure 4 is a cross-sectional view of another embodiment of a scroll compressor communicating air passage inside a housing;

[0031] Figure 5 It is a schematic diagram of the structure of the scroll compressor connecting air passage inside the shell;

[0032] Figure 6 It is a schematic diagram of the lower air collecting hood of the scroll compressor lubricating oil circulation structure;

[0033] Figure 7 This is a schematic diagram of the air collecting hood on the scroll compressor lubricating oil circulation structure.

[0034] The numbers involved in the drawings are as follows: shell 1, intake pipe 11, drive motor 2, lower air collecting hood 21, upper air collecting hood 22, exhaust port 221, compression part 3, main bearing seat 4, reinforcement part 41, low-pressure cavity 5, connecting air duct 6, guide part 7. DETAILED DESCRIPTION

[0035] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0036] like Figure 1-7 As shown, the utility model discloses a scroll compressor lubricating oil circulation structure, comprising: a housing 1, a driving motor 2, a compression part 3, a main bearing seat 4 and a low-pressure cavity 5;

[0037] An air intake pipe 11 is provided at the lower part of the housing 1;

[0038] The compression part 3 is placed inside the shell 1, and an air inlet is provided above the compression part 3;

[0039] The main bearing seat 4 is placed under the compression part 3 to support the compression part 3;

[0040] The low-pressure cavity 5 is connected to the air inlet through a connecting airway 6;

[0041] The refrigerant medium enters the low-pressure cavity 5 through the suction pipe 11 , and enters the compression part 3 through the connecting air passage 6 and the suction port.

[0042] The refrigerant medium enters the low-pressure cavity 5 in the compressor from the suction port, and then passes through the connecting air passage 6 and enters the suction port above the vortex portion, so that the suction circuit avoids the lubricating oil splashing area caused by the relative movement of the thrust structure and the movable scroll, thereby reducing the oil circulation rate and improving the energy efficiency of the compressor.

[0043] A lower air collecting hood 21 is provided inside the housing 1, and the lower air collecting hood 21 is connected to the air suction pipe 11, and the lower air collecting hood 21 is interference-connected with the outer diameter of the driving motor 2. The outlet of the lower air collecting hood 21 is connected to the inlet of the lower air collecting hood 21, and the refrigerant medium entering through the air suction pipe 11 enters the lower air collecting hood 21, and the lower air collecting hood 21 restricts the refrigerant medium from flowing downward, so that the refrigerant medium moves upward along the gap of the driving motor 2 or the flow grooves in the stator and rotor.

[0044] In some embodiments of the utility model, the low-pressure chamber 5 is composed of a main bearing seat 4, a shell 1, and a lower air collecting hood 21. The major diameter of the main bearing seat 4 matches the inner diameter of the shell 1. In addition, a reinforcement portion 41 is provided on the side wall of the main bearing seat 4, and a guide portion 7 is provided above the reinforcement portion 41 and outside the compression portion 3. A connecting air duct 6 is opened on the side walls of the reinforcement portion 41 and the guide portion 7.

[0045] The refrigerant medium continues to move upward after passing through the drive motor 2 , while the main bearing seat 4 above limits the upward movement of the refrigerant medium to prevent it from entering the lubricating oil splash zone above. The refrigerant medium then enters the air inlet through the connecting air passage 6 .

[0046] In another embodiment of the present solution, the difference from the above embodiment is that the communicating air passage 6 is arranged outside the shell 1, and the refrigerant passes through the shell 1 through the communicating air passage 6 and enters the air inlet.

[0047] In some embodiments of the utility model, an upper air collecting hood 22 is further provided in the shell 1. The upper air collecting hood 22 is arranged above the driving motor 2 and has an interference fit with the outer diameter of the driving motor 2. An exhaust port 221 connected to the connecting air duct 6 is opened on the upper air collecting hood 22. The low-pressure cavity 5 is composed of the upper air collecting hood 22, the shell 1, and the lower air collecting hood 21.

[0048] In addition, a reinforcement portion 41 is provided on the side wall of the main bearing seat 4, and a guide portion 7 is provided above the reinforcement portion 41 and outside the compression portion 3. The reinforcement portion 41 and the guide portion 7 are connected by bolts or pins, and a connecting air duct 6 is opened on the side walls of the reinforcement portion 41 and the guide portion 7.

[0049] Similarly, the lower air collecting hood 21 limits the downward movement of the refrigerant gas, causing the refrigerant medium to move upward along the gap of the drive motor 2 or the flow grooves in the stator and rotor, while the upper air collecting hood 22 above the drive motor 2 limits the upward movement of the refrigerant medium to avoid entering the lubricating oil splash zone above, and the refrigerant medium enters the air inlet through the connecting air duct 6.

[0050] In another embodiment of the present solution, the difference from the above embodiment is that the communicating air passage 6 is arranged outside the shell 1, and the refrigerant passes through the shell 1 through the communicating air passage 6 and enters the air inlet.

[0051] For ordinary technicians in this field, several modifications and improvements can be made without departing from the creative concept of the utility model, which all fall within the protection scope of the utility model.

Claims

1. A scroll compressor lubricating oil circulation structure, characterized in that: include: A housing (1), a driving motor (2), a compression unit (3), a main bearing seat (4) and a low-pressure chamber (5); An air intake pipe (11) is provided at the lower part of the housing (1); The compression part (3) is placed inside the shell (1), and an air intake port is provided above the compression part (3); The main bearing seat (4) is placed below the compression part (3) to support the compression part (3); The low-pressure cavity (5) is connected to the air inlet via a connecting airway (6); The refrigerant medium enters the low-pressure cavity (5) through the suction pipe (11), and enters the compression part (3) through the connecting air passage (6) and the suction port.

2. The scroll compressor lubricating oil circulation structure according to claim 1, characterized in that: A lower air collecting hood (21) is provided inside the housing (1), the lower air collecting hood (21) is communicated with the air intake pipe (11), and the lower air collecting hood (21) is interference-connected with the outer diameter of the driving motor (2).

3. The scroll compressor lubricating oil circulation structure according to claim 2, characterized in that: The major diameter of the main bearing seat (4) matches the inner diameter of the housing (1).

4. The scroll compressor lubricating oil circulation structure according to claim 3, characterized in that: The low-pressure chamber (5) is composed of the main bearing seat (4), the shell (1), and the lower air collecting cover (21).

5. The scroll compressor lubricating oil circulation structure according to claim 2, characterized in that: An upper air collecting hood (22) is also provided in the housing (1); the upper air collecting hood (22) is provided above the drive motor (2) and is interference fit with the outer diameter of the drive motor (2).

6. The scroll compressor lubricating oil circulation structure according to claim 5, characterized in that: The upper air collecting hood (22) is provided with an exhaust port (221) which is in communication with the communicating air passage (6).

7. The scroll compressor lubricating oil circulation structure according to claim 6, characterized in that: The low-pressure chamber (5) is composed of the upper air collecting hood (22), a shell (1), and a lower air collecting hood (21).

8. The scroll compressor lubricating oil circulation structure according to claim 4 or 7, characterized in that: The side wall of the main bearing seat (4) is provided with a reinforcement portion (41), a guide portion (7) is provided above the reinforcement portion (41) and outside the compression portion (3), and the connecting air passage (6) is opened on the side walls of the reinforcement portion (41) and the guide portion (7).

9. The scroll compressor lubricating oil circulation structure according to claim 4 or 7, characterized in that: The communicating air passage (6) is arranged outside the housing (1).

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