Electric scroll compressor for low-temperature heat pumps with oil separation

Abstract

The application discloses a kind of electric scroll compressor with oil low-temperature heat pump, including compressor body, the input end of compressor body is equipped with shell, shell inside inside is provided with and the inner shell of compressor body fixed connection, circulation cavity is formed between inner shell and shell, inner frame inside is provided with transverse baffle, cavity is divided into low-pressure chamber and reflux chamber by baffle, the side of shell is equipped with air inlet pipe, one end of air inlet pipe passes through inner shell and is located in low-pressure chamber inside, the bottom of low-pressure chamber is equipped with oil drain with circulation cavity intercommunication, the side of low-pressure chamber is equipped with a plurality of exhaust port with circulation cavity intercommunication, exhaust port and air inlet pipe correspond, the top of inner shell is equipped with circulation port with reflux chamber intercommunication, the side corresponding to reflux chamber and compressor body is equipped with reflux port, the present application is reasonable in structure, solve electric scroll compressor cannot play the role of gas-liquid separation to refrigerant before compression.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a low-temperature heat pump electric scroll compressor with oil separation. BACKGROUND

[0002] The scroll compressor is composed of a fixed involute scroll plate and an involute scroll plate with eccentric rotation and convolution, which can compress the volume. The scroll compressor is composed of two double function equation type lines of dynamic and static scroll.

[0003] In the process of suction, compression and exhaust, the static plate is fixed on the frame, the dynamic plate is driven by the eccentric shaft and is restricted by the anti-rotation mechanism, and rotates around the center of the static plate base circle with a small radius. The gas is sucked into the periphery of the static plate through the air filter, and is gradually compressed in the crescent-shaped compression cavity composed of the dynamic and static plates, and then is continuously discharged from the axial port of the static plate center part.

[0004] The existing compressor scheme has no oil separation design, the system pipeline contains a small amount of refrigerant oil, and the refrigerant is easy to coexist in the form of gas-liquid under low temperature in winter. If a large amount of liquid refrigerant is not separated and directly sucked into the scroll compressor, the scroll may be broken, the service life of the machine is short, and the above problems are solved by the following solution. SUMMARY

[0005] The purpose of the present application is to provide a low-temperature heat pump electric scroll compressor with oil separation, which can separate the refrigerant before compression.

[0006] The above technical purpose of the present application is realized by the following technical scheme:

[0007] A low-temperature heat pump electric scroll compressor with oil separation, comprising a compressor body, an outer shell is provided on the input end of the compressor body, an inner shell fixedly connected with the compressor body is arranged in the inner shell, a circulation cavity is formed between the inner shell and the outer shell, a transverse partition plate is arranged in the inner frame, the partition plate divides the cavity into a low-pressure cavity and a backflow cavity, an air inlet pipe is provided on the side surface of the outer shell, one end of the air inlet pipe penetrates the inner shell and is located in the low-pressure cavity, an oil leakage port is formed in the bottom of the low-pressure cavity and communicates with the circulation cavity, a plurality of exhaust ports are formed in the side surface of the low-pressure cavity and communicate with the circulation cavity, the exhaust ports correspond to the air inlet pipe, a circulation port is formed in the top of the inner shell and communicates with the backflow cavity, and a backflow port is formed in the corresponding side surface of the backflow cavity and the compressor body.

[0008] As a preferred, a plurality of oil return ports for communicating the backflow cavity and the low-pressure cavity are formed in the side surface of the partition plate.

[0009] As preferred, the inner bottom of the circulation cavity is provided with an inclined plate opposite to the oil leakage port, the end of the inclined plate far from the compressor body is higher than the end close to the compressor body, the oil inlet is arranged on the end of the compressor body inside the circulation cavity, the oil inlet corresponds to the inclined plate, and the lower edge of the oil inlet and the upper side of the inclined plate are in contact with each other.

[0010] As preferred, the side where the exhaust port is located is a plane, and the air inlet pipe and the plane where the exhaust port is located are arranged vertically.

[0011] As preferred, the baffle is an arc-shaped plate, and the oil return port is located at the lowest part of the baffle.

[0012] As preferred, the side of the inner shell opposite to the circulation port is a horizontal plane.

[0013] As preferred, the height of the return flow port is higher than the height of the baffle.

[0014] As preferred, the oil leakage port is located at the lowest side of the inner cavity.

[0015] As preferred, the side of the outer shell far from the compressor body is provided with a controller for controlling the compressor body.

[0016] Advantages:

[0017] (1) The refrigerant enters the low-pressure cavity through the air inlet pipe to perform gas-liquid separation first, the liquid flows out of the oil leakage port due to gravity, and the gas is in the form of gaseous refrigerant after passing through the low-pressure cavity and the circulation cavity, and then enters the compressor body side through the exhaust port and the return flow port. In order to prevent oil mist in the return flow cavity for a long time, the oil is returned to the low-pressure cavity through the oil return port, and then the liquid flows back to the inside of the compressor body through the oil inlet and the inclined plate, so that the risk of direct compression of the low-temperature suction gas with liquid vortex is reduced and controllable after gas-liquid separation;

[0018] (2) The refrigerant flowing from the suction port is discharged in the cavity, and the airflow is turned to form a buffer cavity to weaken the airflow, thereby optimizing the suction pulsation;

[0019] (3) The liquid enters the inside of the compressor body through the height difference of the inclined plate and the oil inlet, so as to ensure the normal oil circulation of the compressor body and sufficient oil amount;

[0020] (4) The refrigerant is circulated through the low-pressure cavity first, which is beneficial to the optimization of suction pulsation NVH;

[0021] (5) The refrigerant sucked through the compressor body side is in a gaseous state and directly compressed in the vortex, and the volumetric efficiency and isentropic efficiency are higher than those of the oil-free compression. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Structure diagram of an embodiment;

[0023] Figure 2 Structure diagram of an embodiment for showing the inside of the shell;

[0024] Figure 3 Structure diagram of an embodiment for showing the swash plate and the oil inlet.

[0025] Reference signs: 1, compressor body; 2, shell; 3, inner shell; 4, circulation cavity; 5, partition plate; 6, low-pressure cavity; 7, backflow cavity; 8, air inlet pipe; 9, oil leakage port; 10, exhaust port; 11, circulation port; 12, backflow port; 13, oil return port; 14, swash plate; 15, oil inlet; 16, controller. DETAILED DESCRIPTION

[0026] The following description is only a preferred embodiment of the present application, and the protection scope is not limited to the embodiment only, and any technical solution falling within the concept of the present application should fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principle of the present application should also be considered as falling within the protection scope of the present application.

[0027] See Figure 1 and Figure 2 As shown in

[0028] The refrigerant enters the low-pressure cavity 6 through the air inlet pipe 8. Since the side surface of the low-pressure cavity 6 is provided with a plurality of exhaust ports 10 communicating with the circulation cavity 4, the side surface where the exhaust ports 10 are located is a plane, and the air inlet pipe 8 and the plane where the exhaust ports 10 are located are arranged vertically, the refrigerant will directly impact on the side surface where the exhaust ports 10 are located, and the refrigerant enters the circulation cavity 4 through the exhaust ports 10. The liquid in the refrigerant falls under its own gravity, and the exhaust ports 10 located on the plane ensure vertical contact with the air inlet pipe 8, weakening the impact force of the airflow.

[0029] See Figure 2As shown, the top of the inner shell 3 is provided with a circulation port 11 communicating with the reflux cavity 7, the side of the inner shell 3 corresponding to the circulation port 11 is a horizontal plane, further weakening the impact force of the gas flow, the side of the reflux cavity 7 corresponding to the compressor body 1 is provided with a reflux port 12, the height of the reflux port 12 is higher than the height of the partition plate 5, and the higher height of the reflux port 12 can avoid that the liquid on the partition plate 5 enters the compressor body 1 through the reflux port 12.

[0030] The gas after passing through the low-pressure cavity 6 and the circulation cavity 4 is in the form of gaseous refrigerant, enters the side of the compressor body 1 through the exhaust port 10 and the reflux port 12, and after gas-liquid separation, the risk of fracture caused by low-temperature suction gas with liquid vortex direct compression is controllable, and the refrigerant flowing into the suction port is discharged through the cavity, and the gas flow is turned to form a buffer cavity to weaken the gas flow, thereby optimizing the suction pulsation.

[0031] See Figure 2 and Figure 3 As shown, the bottom of the low-pressure cavity 6 is provided with an oil leakage port 9 communicating with the circulation cavity 4, the oil leakage port 9 is located at the lowest side of the inner cavity, facilitating the outflow of the liquid and avoiding residual accumulation, the side of the partition plate 5 is provided with a plurality of oil return ports 13 for communicating the reflux cavity 7 and the low-pressure cavity 6, the partition plate 5 is an arc plate, and the oil return ports 13 are located at the lowest part of the partition plate 5, facilitating the outflow of the liquid and avoiding residual accumulation, the inner bottom of the circulation cavity 4 is provided with an inclined plate 14 opposite to the oil leakage port 9, one end of the inclined plate 14 away from the compressor body 1 is higher than the other end close to the compressor body 1, and the compressor body 1 is provided with an oil inlet port 15 on one end inside the circulation cavity 4, the oil inlet port 15 corresponds to the inclined plate 14, and the lower edge of the oil inlet port 15 and the upper side of the inclined plate 14 are in contact with each other.

[0032] The liquid in the refrigerant enters the inclined plate 14 through the oil leakage port 9 under the action of its own gravity, and the height difference of the upper end surface of the inclined plate 14 pushes the liquid to flow into the oil inlet port 15, thereby realizing the circulation of the liquid and ensuring the normal circulation of the compressor body oil and sufficient oil amount.

Claims

1. An electric scroll compressor for low temperature heat pumps with oil fraction, comprising a compressor body (1), characterized by, The input end of the compressor body (1) is sleeved with a shell (2), the inside of the shell (2) is provided with an inner shell (3) fixedly connected with the compressor body (1), a circulating cavity (4) is formed between the inner shell (3) and the shell (2), the inside of the inner shell (3) is provided with a transverse partition plate (5), the partition plate (5) divides the cavity into a low-pressure cavity (6) and a reflux cavity (7), the side of the shell (2) is provided with an air inlet pipe (8), one end of the air inlet pipe (8) penetrates through the inner shell (3) and is located in the low-pressure cavity (6), the bottom of the low-pressure cavity (6) is provided with an oil leakage opening (9) in communication with the circulating cavity (4), the side of the low-pressure cavity (6) is provided with a plurality of exhaust openings (10) in communication with the circulating cavity (4), the exhaust openings (10) correspond to the air inlet pipe (8), the top of the inner shell (3) is provided with a circulating opening (11) in communication with the reflux cavity (7), the side corresponding to the compressor body (1) of the reflux cavity (7) is provided with a reflux opening (12). The inside bottom of the circulating cavity (4) is provided with an inclined plate (14) opposite to the oil leakage opening (9), the end of the inclined plate (14) far away from the compressor body (1) is higher than the end close to the compressor body (1), the end of the compressor body (1) located in the circulating cavity (4) is provided with an oil inlet opening (15), the oil inlet opening (15) corresponds to the inclined plate (14), and the lower edge of the oil inlet opening (15) and the upper side of the inclined plate (14) are in contact with each other.

2. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, characterized by, The side of the partition plate (5) is provided with a plurality of oil return openings (13) for communicating the reflux cavity (7) and the low-pressure cavity (6).

3. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, wherein The side where the exhaust opening (10) is located is a plane, and the air inlet pipe (8) and the plane where the plane exhaust opening (10) is located are arranged vertically.

4. The electric scroll compressor with oil division for a low temperature heat pump according to claim 2, wherein The partition plate (5) is an arc-shaped plate, and the oil return opening (13) is located at the lowest part of the partition plate (5).

5. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, wherein The side of the inner shell (3) opposite to the circulating opening (11) is a horizontal plane.

6. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, wherein The height of the reflux opening (12) is higher than the height of the partition plate (5).

7. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, wherein The oil leakage opening (9) is located at the lowest side of the inner cavity.

8. The electric scroll compressor with oil division for a low temperature heat pump according to claim 1, wherein The side of the shell (2) far away from the compressor body (1) is provided with a controller (16) for controlling the compressor body (1).

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