Scroll compressor with oil return structure

Abstract

The scroll compressor with the oil return structure comprises a machine shell, a movable scroll plate and a static scroll plate, and the movable scroll plate and the static scroll plate are matched to form a compression cavity; a rear cover is arranged at one end of the machine shell, an exhaust cavity is formed between the rear cover and the static scroll plate, and the exhaust cavity is communicated with the compression cavity through an exhaust hole; an oil return channel is formed between the rear cover and the static scroll plate and comprises a high-pressure oil cavity, an oil return groove and a medium-pressure oil cavity; the high-pressure oil cavity is arranged below the exhaust cavity in a separated mode, so that the situation that a high-pressure medium flowing in the exhaust cavity impacts separated refrigeration oil and excites the refrigeration oil to form secondary oil mist can be effectively avoided, and the oil spitting amount of the compressor is reduced. The two ends of the oil return groove communicate with the high-pressure oil cavity and the medium-pressure oil cavity correspondingly, the medium-pressure oil cavity communicates with the low-pressure cavity of the scroll compressor, the oil return groove and the medium-pressure oil cavity can conduct throttling and pressure stabilizing on backflow refrigeration oil, the unstable influence of exhaust pressure pulsation of the exhaust cavity on oil return pressure is effectively reduced, and the oil return rate is stabilized.

Description

Technical Field

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

[0002] A scroll compressor is a high-efficiency, low-noise and low-vibration, high-reliability, and smooth-running compressor that is widely used in technical fields such as refrigeration equipment, thermal management, and new energy storage mobile equipment. Conventional scroll compressors usually include a rear cover, a stationary scroll, a movable scroll, a middle casing, a drive bearing, a main bearing, a main casing, a motor, a crankshaft, and a drive module.

[0003] At present, the high-pressure oil return structure of the scroll compressor is usually arranged in the exhaust chamber on the upper part of the static scroll disk, and the return of the refrigerant oil after separation is achieved by processing an inclined hole on the static scroll disk. Since the oil return hole is close to the exhaust hole and the bypass hole of the static scroll disk, and the oil return structure is integrated with the exhaust chamber, the return oil flow rate is small due to the influence of the diameter of the oil return hole. As the amount of refrigerant oil separated by the exhaust increases, the refrigerant oil level in the exhaust chamber also rises accordingly. The separated refrigerant oil is easily agitated again by the continuously discharged high-pressure medium to form oil mist, resulting in an increase in the oil discharge volume of the compressor, affecting the refrigeration effect of the equipment; in addition, due to the position problem of the oil return hole, the exhaust pressure pulsation of the compressor will directly affect the fluctuation of the return oil pressure, thereby affecting the oil return rate. For some scroll compressors with a back pressure structure design, it is also easy to cause problems such as unstable back pressure and unstable operation of the movable scroll. Utility Model Content

[0004] In view of this, an embodiment of the utility model provides a scroll compressor with an oil return structure, and the oil return structure of the compressor is redesigned, which can not only avoid the high-pressure medium flowing in the exhaust chamber from impacting the separated refrigerant oil to form oil mist, but also reduce the unstable influence of the exhaust pressure pulsation of the exhaust chamber on the return oil pressure.

[0005] The utility model provides a scroll compressor with an oil return structure, comprising a casing, and an orbiting scroll and a stationary scroll arranged in the casing, wherein the orbiting scroll and the stationary scroll cooperate to form a compression chamber; a rear cover is arranged at one end of the casing close to the stationary scroll, an exhaust chamber is formed between the rear cover and the stationary scroll, and an exhaust hole for connecting the compression chamber and the exhaust chamber is arranged on the stationary scroll;

[0006] An oil return passage is also formed between the rear cover and the stationary scroll plate, and the oil return passage includes a high-pressure oil chamber, an oil return groove and a medium-pressure oil chamber; the high-pressure oil chamber is separated and arranged below the exhaust chamber, and is connected with the exhaust chamber through an oil return hole; the two ends of the oil return groove are respectively connected to the high-pressure oil chamber and the medium-pressure oil chamber, and the medium-pressure oil chamber is connected to the low-pressure chamber of the scroll compressor.

[0007] Optionally, a partition is provided between the exhaust chamber and the high-pressure oil chamber, and the oil return hole is provided on the partition.

[0008] Optionally, a flow guiding slope slanting downward toward the oil return hole is formed on the partition.

[0009] Optionally, the oil return groove is arranged on the end surface of the rear cover facing the fixed scroll plate, and the oil return groove extends in a circumferential annular shape along the rear cover.

[0010] Optionally, the oil return groove is arranged on the end surface of the fixed scroll plate facing the rear cover, and the oil return groove extends in a circumferential annular shape along the fixed scroll plate.

[0011] Optionally, the fixed scroll plate is provided with an oil outlet passage for connecting the medium-pressure oil chamber and the low-pressure chamber.

[0012] Optionally, the oil outlet channel includes an oil outlet end and a throttling end connected to each other, the oil outlet end and the throttling end are respectively connected to the medium-pressure oil chamber and the low-pressure chamber, and a cross-section of the throttling end is smaller than a cross-section of the oil outlet end.

[0013] The embodiments of the present utility model have the following beneficial effects:

[0014] 1. The exhaust chamber is isolated from the high-pressure oil chamber, which effectively prevents the high-pressure medium flowing in the exhaust chamber from impacting the separated refrigeration oil to form secondary oil mist, thereby reducing the oil discharge volume of the compressor;

[0015] 2. A medium-pressure oil chamber is established, and the throttling principle of the oil return channel and the favorable factors of throttling on pressure pulsation are utilized to reduce the unstable influence of the exhaust pressure pulsation of the exhaust chamber on the return oil pressure, thereby effectively stabilizing the oil return rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0020] Figure 4 for Figure 1 A partial enlarged schematic diagram of point C in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the back cover in the embodiment of the utility model;

[0022] The numbers in the figure represent:

[0023] 1. Casing; 2. Orbiting scroll; 3. Stationary scroll; 31. Exhaust hole; 32. Oil outlet channel; 321. Oil outlet end; 322. Throttling end; 4. Compression chamber; 5. Rear cover; 51. Oil return hole; 52. Partition plate; 521. Guide slope; 6. Exhaust chamber; 7. High-pressure oil chamber; 8. Oil return groove; 9. Medium-pressure oil chamber; 10. Low-pressure chamber. DETAILED DESCRIPTION

[0024] 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, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0025] See also Figure 1As shown, an embodiment of the utility model provides a scroll compressor with an oil return structure, which includes a casing 1 and a movable scroll 2 and a fixed scroll 3 arranged in the casing 1, and a compression chamber 4 is formed between the movable scroll 2 and the fixed scroll 3. A rear cover 5 is provided at one end of the casing 1 close to the fixed scroll 3, and an exhaust chamber 6 is formed between the rear cover 5 and the fixed scroll 3, and the exhaust chamber 6 is connected to the compression chamber 4 through an exhaust hole 31 provided on the fixed scroll 3. When the compressor is working, the movable scroll 2 can move around the center of the fixed scroll 3 in an eccentric manner under the drive of a driving mechanism (not shown in the figure), so that the mixed medium of refrigerant and refrigeration oil is sucked into the compression chamber 4 and compressed in the compression chamber 4, and the compressed high-pressure medium is discharged into the exhaust chamber 6 through the exhaust hole 31 and oil and gas separation is performed in the exhaust chamber 6.

[0026] like Figure 1 , Figure 2 As shown, an oil return channel is also formed between the rear cover 5 and the fixed scroll plate 3, and the oil return channel includes a high-pressure oil chamber 7, an oil return groove 8 and a medium-pressure oil chamber 9. Among them, the high-pressure oil chamber 7 is separated from the exhaust chamber 6 and communicated with the exhaust chamber 6 through the oil return hole 51. Specifically, in the embodiment of the utility model, a partition 52 is provided between the exhaust chamber 6 and the high-pressure oil chamber 7, and the oil return hole 51 is provided on the partition 52. The high-pressure oil chamber 7 is arranged below the exhaust chamber 6, so that the separated refrigerant oil can flow into the high-pressure oil chamber 7 through the oil return hole 51 under the action of pressure and gravity; further, a guide slope 521 inclined downward toward the oil return hole 51 can be provided on the partition 52 to guide the separated refrigerant oil. Compared with the previous structure, the embodiment of the utility model separates the exhaust chamber 6 from the high-pressure oil chamber 7, which can effectively prevent the high-pressure medium flowing in the exhaust chamber 6 from impacting the separated refrigerant oil and arousing the formation of secondary oil mist, thereby reducing the oil discharge amount of the compressor.

[0027] The two ends of the oil return groove 8 are respectively connected to the high-pressure oil chamber 7 and the medium-pressure oil chamber 9, and the medium-pressure oil chamber 9 is connected to the low-pressure chamber 10 of the scroll compressor. The refrigerant oil in the high-pressure oil chamber 7 can flow into the medium-pressure oil chamber 9 through the oil return groove 8, and finally flow back to the low-pressure chamber 10 of the scroll compressor. The oil return groove 8 and the medium-pressure oil chamber 9 can throttle and stabilize the refrigerant oil flowing back, effectively reducing the unstable effect of the exhaust pressure pulsation of the exhaust chamber 6 on the return oil pressure, thereby stabilizing the oil return rate.

[0028] Specifically, Figure 5 As shown, in the embodiment of the utility model, the oil return groove 8 is arranged on the end surface of the rear cover 5 facing the fixed scroll plate 3, and the oil return groove 8 extends in an annular manner along the circumference of the rear cover 5 to extend the oil return path of the refrigeration oil and improve the throttling effect. Similarly, the oil return groove 8 can also be arranged on the end surface of the fixed scroll plate 3 facing the rear cover 5, and the oil return groove 8 extends in an annular manner along the circumference of the fixed scroll plate 3. Figure 3As shown, the oil return groove 8 can be realized directly by machining an annular groove on the end face of the rear cover 5 or the fixed scroll plate 3, or it can be realized by a recessed structure defined by two annular ribs spaced apart, and this application does not make too many restrictions.

[0029] Furthermore, the fixed scroll plate 3 is also provided with an oil outlet passage 32 for connecting the medium-pressure oil chamber 9 and the low-pressure chamber 10. Figure 4 As shown, the oil outlet channel 32 includes an oil outlet end 321 and a throttling end 322 which are connected to each other. The oil outlet end 321 and the throttling end 322 are respectively connected to the medium-pressure oil chamber 9 and the low-pressure chamber 10, and the cross-section of the throttling end 322 is smaller than the cross-section of the oil outlet end 321 to further reduce the flow rate and alleviate the return oil pressure.

[0030] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A scroll compressor with an oil return structure, comprising a casing and an orbiting scroll and a fixed scroll arranged in the casing, wherein the orbiting scroll and the fixed scroll cooperate to form a compression chamber; characterized in that: A rear cover is provided at one end of the casing close to the fixed scroll, an exhaust cavity is formed between the rear cover and the fixed scroll, and an exhaust hole for connecting the compression cavity and the exhaust cavity is provided on the fixed scroll; An oil return passage is also formed between the rear cover and the stationary scroll plate, and the oil return passage includes a high-pressure oil chamber, an oil return groove and a medium-pressure oil chamber; the high-pressure oil chamber is separated and arranged below the exhaust chamber, and is connected with the exhaust chamber through an oil return hole; the two ends of the oil return groove are respectively connected to the high-pressure oil chamber and the medium-pressure oil chamber, and the medium-pressure oil chamber is connected to the low-pressure chamber of the scroll compressor.

2. A scroll compressor with an oil return structure according to claim 1, characterized in that: A partition is provided between the exhaust chamber and the high-pressure oil chamber, and the oil return hole is provided on the partition.

3. A scroll compressor with an oil return structure according to claim 2, characterized in that: The partition plate is formed with a flow guiding slope which is inclined downward toward the oil return hole.

4. The scroll compressor with an oil return structure according to claim 1, characterized in that: The oil return groove is arranged on the end surface of the rear cover facing the fixed scroll plate, and the oil return groove extends in a ring shape along the circumference of the rear cover.

5. The scroll compressor with an oil return structure according to claim 1, characterized in that: The oil return groove is arranged on the end surface of the fixed scroll plate facing the rear cover, and the oil return groove extends in a circular shape along the circumference of the fixed scroll plate.

6. The scroll compressor with an oil return structure according to claim 1, characterized in that: The fixed scroll plate is provided with an oil outlet passage for connecting the medium-pressure oil chamber and the low-pressure chamber.

7. The scroll compressor with an oil return structure according to claim 6, characterized in that: The oil outlet passage comprises an oil outlet end and a throttling end which are connected to each other. The oil outlet end and the throttling end are respectively connected to the medium-pressure oil chamber and the low-pressure chamber. The cross section of the throttling end is smaller than the cross section of the oil outlet end.

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