Exhaust circulation system of electric compressor

Abstract

According to the exhaust circulation system of the electric compressor, exhaust pulsation can be optimized, the oil-gas separation effect is improved, and therefore the performance is improved. Mixed gas exhausted from a static scroll plate exhaust hole (11) enters the exhaust cavity and then is shunted to enter the two sides of the circulation cavity, airflow disturbance in the exhaust process is reduced, and exhaust pulsation is reduced. When flowing through the circulating cavity, the mixed gas is blocked by the isolation ribs (13), the gas flow direction is changed, the gas flow speed is reduced, oil gas and refrigerant gas are separated for the first time, and exhaust pulsation is optimized; then, the mixed gas enters an oil-gas separation cavity through an exhaust hole (9), the mixed gas spirally moves around the outer circumferential surface of the oil-gas separator (7), so that the mixed gas is subjected to secondary separation, and the separated refrigerant gas upwards moves along an inner hole (8) of the oil-gas separator to enter an air conditioning system; the oil gas continuously impacts the wall surface of the oil-gas separation cavity in the spiral motion to form oil liquid which flows down along the wall surface to enter the oil storage cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of electric compressors, in particular to an exhaust circulation system of an electric compressor. Background Art

[0002] Existing electric compressors use an integrated exhaust system without oil and gas separation. A small amount of oil and gas are mixed with refrigerant gas, resulting in large air flow disturbances and strong exhaust pulsation during the exhaust process, which reduces compressor performance and easily causes failures. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an electric compressor exhaust circulation system, which can optimize exhaust pulsation, improve oil-gas separation effect, and thus improve performance.

[0004] The object of the present invention is achieved like this: An electric compressor exhaust circulation system comprises a static scroll (1) and a rear cover (3), wherein the static scroll (1) is mounted on the rear cover (3). A concave cavity is provided on the front end surface of the rear cover (3), the wall surface of the concave cavity is the rear cover inner wall (14), a circular convex rib (12) is provided in the middle of the concave cavity, the inner space of the circular convex rib (12) is an exhaust cavity, a static vortex is provided with a static vortex exhaust hole (11), the static vortex exhaust hole (11) is connected to the exhaust cavity, and the annular space between the circular convex rib (12) and the rear cover inner wall (14) is divided into a circulation cavity and an oil storage cavity by a separating rib, and the exhaust cavity, the circulation cavity, the oil storage cavity and the static vortex (1) are sealed, two exhaust ports (5) are provided in the radial direction on the circular convex rib (12), and the two exhaust ports (5) are located on both sides of the oil storage cavity, and a plurality of separating ribs (13) with different heights along the radial direction are provided inside the circulation cavity; An oil-gas separation chamber is further provided on the rear wall (6) of the rear cover. An exhaust hole (9) is provided on the upper portion of the oil-gas separation chamber corresponding to the circulation chamber. Isolation ribs (13) are distributed between the exhaust port (5) and the exhaust hole (9). An oil outlet hole (4) is provided on the bottom portion of the oil-gas separation chamber corresponding to the oil storage chamber. An oil-gas separator (7) is pressurized in the oil-gas separation chamber. The outer peripheral surface of the oil-gas separator (7) corresponds to the exhaust hole (9). The oil-gas separator (7) has an oil-gas separator inner hole (8). The oil-gas separator inner hole (8) is connected to the air conditioning system. The high-temperature and high-pressure refrigerant gas and the mixed gas of oil and gas discharged from the static scroll plate exhaust hole (11) enter the exhaust chamber and then split, and enter the two sides of the circulation chamber through the two exhaust ports (5) respectively, thereby reducing the air flow disturbance during the exhaust process and reducing the exhaust pulsation; When the mixed gas flows through the circulation cavity, it is blocked by the isolation rib (13), which changes the direction of the airflow, reduces the airflow velocity, and separates the oil gas and the refrigerant gas for the first time, thereby optimizing the exhaust pulsation; Subsequently, the mixed gas enters the oil-gas separation chamber through the exhaust hole (9), and the mixed gas makes a spiral motion around the outer peripheral surface of the oil-gas separator (7), so that the mixed gas undergoes secondary separation. The separated refrigerant gas moves upward along the inner hole (8) of the oil-gas separator and enters the air-conditioning system. The oil and gas continuously hit the wall of the oil-gas separation chamber during the spiral motion, forming oil liquid that flows down along the wall and enters the oil storage chamber.

[0005] Preferably, a special-shaped sealing groove (10) is provided on the static scroll (1), and a special-shaped sealing ring (2) is installed in the special-shaped sealing groove (10). The special-shaped sealing ring (2) forms a seal between the outer side of the rear cover concave cavity and the static scroll (1), and forms a seal between the oil storage chamber and the exhaust chamber and the circulation chamber.

[0006] Preferably, a plurality of arc-shaped clips (15) are evenly distributed on the circumference of the special-shaped sealing ring (2), and the arc-shaped clips (15) are positioned in the special-shaped sealing groove (10).

[0007] Preferably, the oil-gas separation chamber is a conical chamber that is larger at the top and smaller at the bottom.

[0008] The conical chamber is used to change the circulation radius of the mixed gas entering the oil-gas separation chamber, thereby changing the flow rate and flow direction of the mixed gas, so that the oil gas and refrigerant gas in the mixed gas can be quickly separated during the spiral motion.

[0009] Preferably, the exhaust hole (9) corresponds to a tangential position of the outer peripheral surface of the oil-gas separator (7).

[0010] Preferably, an oil return hole (1a) is provided on the fixed scroll (1), and the oil return hole (1a) is connected to the interior of the electric compressor at an angle downward from the oil storage chamber.

[0011] The oil in the oil storage chamber is squeezed by the high-pressure refrigerant gas above and returns to the electric compressor through the oil return hole (1a) on the stator plate.

[0012] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The present invention optimizes the details of the structure of the static scroll disk and the rear cover, divides the originally integrated exhaust system into three parts: an exhaust chamber, a circulation chamber and an oil storage chamber. At the same time, combined with the structural design of the special-shaped sealing ring, it effectively isolates them, and sets two exhaust ports in the exhaust chamber to divert the gas in the exhaust chamber, so that the mixed gas of oil and gas and refrigerant gas enters the two sides of the circulation chamber respectively, thereby reducing the airflow disturbance during the exhaust process and reducing the exhaust pulsation. Isolation ribs of varying heights are set in the circulation chamber to change the direction of the airflow, reduce the airflow velocity, and enable a small amount of oil and gas to be separated from the refrigerant gas for the first time, thereby optimizing the exhaust pulsation. At the same time, a conical oil-gas separation chamber is set on the rear wall of the rear cover. The chamber runs through the exhaust chamber, the circulation chamber, and the oil storage chamber to form an independent chamber. The gas in the circulation chamber enters the oil-gas separation chamber for secondary separation, and the oil and gas condense into oil liquid and enter the oil storage chamber, while the refrigerant gas enters the system through the inner hole of the oil-gas separator, eliminating the possibility of oil and gas mixing again in the same cavity after separation, thereby improving the oil-gas separation effect, reducing the oil content of the refrigerant gas entering the air-conditioning system circulation, reducing the risk of oil blockage, and improving the refrigeration performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the present invention.

[0014] Reference numerals In the accompanying drawings, there are a static scroll 1, a special-shaped sealing ring 2, a rear cover 3, an oil outlet 4, an exhaust port 5, a rear wall of the rear cover 6, an oil-gas separator 7, an inner hole of the oil-gas separator 8, an exhaust hole 9, a special-shaped sealing groove 10, a static scroll exhaust hole 11, a circular convex rib 12, an isolation rib 13, an inner wall of the rear cover 14, and an arc-shaped clip 15. DETAILED DESCRIPTION

[0015] An electric compressor exhaust circulation system comprises a static scroll 1, a special-shaped sealing ring 2, a rear cover 3 and an oil-gas separator 7.

[0016] The fixed scroll 1 is provided with a special-shaped sealing groove 10, located below the operating position of the electric compressor and forming an independent unit (not connected to any other part). The special-shaped sealing ring 2 is installed in the special-shaped sealing groove 10 of the fixed scroll 1. Three arc-shaped clips 15 are evenly distributed on the outer circumference of the special-shaped sealing ring 2 to ensure the relative position of the special-shaped sealing ring 2 in the special-shaped sealing groove 10 and to prevent the special-shaped sealing ring 2 from falling out of the special-shaped sealing groove 10 after assembly.

[0017] A circular rib 12 is positioned in the center of the rear cover 3. Through design, it forms an exhaust chamber with the surface of the fixed scroll 1. Two exhaust ports 5 are radially positioned on the rib 12, with the rear cover inner wall 14 on the outer side. A circulation chamber is located between the rib 12 and the rear cover inner wall 14. The circulation chamber is located at the bottom of the compressor's operating position. Two separating ribs, the rib 12, and the rear cover inner wall 14 together form an oil storage chamber. Multiple radially spaced separating ribs 13 are evenly distributed within the circulation chamber, staggered in height.

[0018] The rear wall 6 of the rear cover is provided with an oil-gas separation chamber which penetrates the exhaust chamber, the circulation chamber and the oil storage chamber. The oil-gas separation chamber is a conical closed chamber. The part of the oil-gas separation chamber corresponding to the circulation chamber is provided with an exhaust hole 9, and the part of the oil-gas separation chamber corresponding to the oil storage chamber is provided with an oil outlet hole 4. An oil-gas separator 7 is installed in the oil-gas separation chamber, and the outside of the oil-gas separation chamber is connected to the air-conditioning system.

[0019] The fixed scroll has a fixed scroll exhaust hole 11, which communicates with the exhaust chamber. The high-temperature, high-pressure refrigerant gas and oil-gas mixture discharged from the fixed scroll exhaust hole 11 enters the exhaust chamber and is then split, entering the two sides of the circulation chamber through two exhaust ports 5 on the circular rib 12. This reduces airflow disturbance during the exhaust process and reduces exhaust pulsation. When the mixed gas flows through the circulation chamber, it is blocked by the isolation rib 13, which changes the airflow direction and reduces the airflow velocity, allowing for the initial separation of a small amount of oil and refrigerant gas, thereby optimizing exhaust pulsation. Subsequently, the mixed gas passes through the exhaust hole 9 and enters the oil-gas separation chamber, and makes a spiral motion around the oil-gas separator 7, so that the mixed gas is separated for the second time. The separated refrigerant gas moves upward along the inner hole 8 of the oil-gas separator and enters the air-conditioning system. The oil and gas continuously hit the wall of the oil-gas separation chamber during the spiral motion to form oil liquid, which flows down along the wall into the oil storage chamber and returns to the electric compressor body, eliminating the possibility of oil and gas mixing again in the same cavity after separation, improving the oil-gas separation effect, reducing the oil content of the refrigerant gas entering the air-conditioning system circulation, reducing the risk of oil blockage, and improving the refrigeration performance.

[0020] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An electric compressor exhaust circulation system, characterized by: It comprises a static scroll disk (1) and a rear cover (3), wherein the static scroll disk (1) is mounted on the rear cover (3). A concave cavity is provided on the front end surface of the rear cover (3), the wall surface of the concave cavity is the rear cover inner wall (14), a circular convex rib (12) is provided in the middle of the concave cavity, the inner space of the circular convex rib (12) is an exhaust cavity, a static vortex is provided with a static vortex exhaust hole (11), the static vortex exhaust hole (11) is connected to the exhaust cavity, and the annular space between the circular convex rib (12) and the rear cover inner wall (14) is divided into a circulation cavity and an oil storage cavity by a separating rib, and the exhaust cavity, the circulation cavity, the oil storage cavity and the static vortex (1) are sealed, two exhaust ports (5) are provided in the radial direction on the circular convex rib (12), and the two exhaust ports (5) are located on both sides of the oil storage cavity, and a plurality of separating ribs (13) with different heights along the radial direction are provided inside the circulation cavity; An oil-gas separation chamber is further provided on the rear wall (6) of the rear cover. An exhaust hole (9) is provided on the upper portion of the oil-gas separation chamber corresponding to the circulation chamber. Isolation ribs (13) are distributed between the exhaust port (5) and the exhaust hole (9). An oil outlet hole (4) is provided on the bottom portion of the oil-gas separation chamber corresponding to the oil storage chamber. An oil-gas separator (7) is pressurized in the oil-gas separation chamber. The outer peripheral surface of the oil-gas separator (7) corresponds to the exhaust hole (9). The oil-gas separator (7) has an oil-gas separator inner hole (8). The oil-gas separator inner hole (8) is connected to the air conditioning system. The high-temperature and high-pressure refrigerant gas and the mixed gas of oil and gas discharged from the static scroll plate exhaust hole (11) enter the exhaust chamber and then split, and enter the two sides of the circulation chamber through the two exhaust ports (5) respectively, thereby reducing the air flow disturbance during the exhaust process and reducing the exhaust pulsation; When the mixed gas flows through the circulation cavity, it is blocked by the isolation rib (13), which changes the direction of the airflow, reduces the airflow velocity, and separates the oil gas and the refrigerant gas for the first time, thereby optimizing the exhaust pulsation; Subsequently, the mixed gas enters the oil-gas separation chamber through the exhaust hole (9), and the mixed gas makes a spiral motion around the outer peripheral surface of the oil-gas separator (7), so that the mixed gas undergoes secondary separation. The separated refrigerant gas moves upward along the inner hole (8) of the oil-gas separator and enters the air-conditioning system. The oil and gas continuously hit the wall of the oil-gas separation chamber during the spiral motion, forming oil liquid that flows down along the wall and enters the oil storage chamber.

2. The electric compressor exhaust circulation system according to claim 1, characterized in that: A special-shaped sealing groove (10) is provided on the static scroll (1), and a special-shaped sealing ring (2) is installed in the special-shaped sealing groove (10). The special-shaped sealing ring (2) forms a seal between the outer side of the rear cover concave cavity and the static scroll (1), and forms a seal between the oil storage cavity and the exhaust cavity and the circulation cavity.

3. The electric compressor exhaust circulation system according to claim 2, characterized in that: A plurality of arc-shaped clips (15) are evenly distributed on the circumference of the special-shaped sealing ring (2), and the arc-shaped clips (15) are positioned in the special-shaped sealing groove (10).

4. The electric compressor exhaust circulation system according to claim 1, characterized in that: The oil-gas separation chamber is a conical chamber that is larger at the top and smaller at the bottom.

5. The electric compressor exhaust circulation system according to claim 1, characterized in that: The exhaust hole (9) corresponds to a tangential position of the outer peripheral surface of the oil-gas separator (7).

6. The electric compressor exhaust circulation system according to claim 1, characterized in that: An oil return hole (1a) is provided on the static scroll (1), and the oil return hole (1a) is connected to the interior of the electric compressor by slanting downward from the oil storage chamber.

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