CN217652907U - Oil return structure of scroll compressor and scroll compressor - Google Patents

Abstract

The utility model provides an oil return structure and scroll compressor of scroll compressor, wherein, scroll compressor's oil return structure locates between scroll compressor's the exhaust chamber and the low-pressure chamber, and the exhaust chamber is enclosed to construct by scroll compressor's static vortex dish and end cover and forms. The oil return structure comprises a blocking piece arranged in the exhaust cavity and an oil return oil way communicated with the exhaust cavity and the low-pressure cavity, the oil return oil way flows through a crankshaft in the scroll compressor and a bearing on the movable scroll, the blocking piece blocks an oil-gas mixture entering the exhaust cavity, so that the oil-gas mixture is separated to form an oil layer and a gas layer, and oil in the oil layer below flows back into the low-pressure cavity through the fixed scroll and the oil return oil way. The utility model discloses an oil return structure of scroll compressor through locating the separation piece in the exhaust chamber, separates the frozen oil and lubricates for bent axle and bearing to finally enter into the low-pressure chamber, in order to guarantee that the inside oil return of scroll compressor is sufficient, improve the refrigeration efficiency of system.

Description

Oil return structure of scroll compressor and scroll compressor

Technical Field

The utility model relates to an air condition compressor technical field, in particular to scroll compressor's oil return structure. Additionally, the utility model discloses still relate to a scroll compressor.

Background

The scroll compressor is a positive displacement compressor, the compression part is composed of a movable scroll and a fixed scroll, and the working principle is that the relative revolution motion of the movable scroll and the fixed scroll is utilized to form the continuous change of the enclosed volume, thereby realizing the purpose of compressing gas. The electric scroll compressor is gradually widely used as a matching product of a new energy automobile air conditioner guided by national automobile policy.

When the automobile air conditioner operates in a refrigerating mode, low-temperature low-pressure refrigerant gas is sucked by the compressor and then is pressurized to be changed into high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas releases heat in the heat exchanger through the condenser to be changed into medium-temperature high-pressure liquid, the medium-temperature high-pressure liquid is expanded and reduced in pressure through the capillary tube to be changed into low-temperature low-pressure liquid, the low-temperature low-pressure liquid refrigerant absorbs heat and is evaporated through the evaporator to be changed into low-temperature low-pressure gas, the low-temperature low-pressure refrigerant gas is sucked by the post-compressor, and the operation is repeated.

The refrigeration oil usually selected in the prior scroll compressor is dissolved with the refrigerant, and the refrigeration oil forms an oil circuit circulation in the compressor along with the refrigerant. The existing common design mode is that an oil separation mechanism is designed in a compressor exhaust cavity, and after oil passes through an end cover oil return structure, specific oil path design is carried out on a part needing lubrication. However, in the prior art, the oil return amount of the compressor is low under the condition of low speed, which causes insufficient oil return amount, causes abnormal operation of the compressor, increases abrasion of moving parts, and reduces the refrigeration efficiency of the system.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an oil return structure of scroll compressor to do benefit to the separation of the inside refrigeration oil of scroll compressor and refrigerant and the backward flow of fluid.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

an oil return structure of a scroll compressor is arranged between an exhaust cavity and a low-pressure cavity of the scroll compressor, wherein the exhaust cavity is formed by enclosing a static scroll plate and an end cover of the scroll compressor; the oil return structure comprises a blocking piece arranged in the exhaust cavity and an oil return path communicated with the exhaust cavity and the low-pressure cavity, and the oil return path flows through a crankshaft in the scroll compressor and a bearing on the movable scroll plate; the blocking piece is used for blocking the oil-gas mixture entering the exhaust cavity, separating the oil-gas mixture to form an oil layer and a gas layer, and oil in the oil layer below flows back to the oil-gas mixture in the low-pressure cavity through the fixed scroll and the oil return oil way.

Further, the blocking piece comprises a blocking plate arranged on the end cover, and a circulation gap is reserved between the blocking plate and the end face of the fixed scroll plate; the blocking plate divides the exhaust cavity into a plurality of cavities which are connected in sequence, and the cavities which are positioned at the tail end and the exhaust port of the scroll compressor are communicated with the oil-gas mixture along the flowing direction of the oil-gas mixture.

Further, the baffle plate is cylindrical and is coaxial with the crankshaft, and the chambers comprise a first chamber located inside the baffle plate and a second chamber located outside the baffle plate; the compression cavity of the scroll compressor is communicated with the first cavity, and the exhaust port is communicated with the second cavity.

Furthermore, the edge part of the end surface is provided with a matching part, and the fixed scroll is arranged on the end cover through the matching part; the oil return oil way comprises an oil duct arranged at the matching part; and the oil is discharged out of the exhaust cavity through the oil duct.

Furthermore, a sealing gasket is arranged between the matching part and the end cover, a gap is arranged on the sealing gasket, and the oil duct is formed between the gap and the fixed scroll plate.

Furthermore, the oil return passages are arranged around the axis of the crankshaft at intervals.

Further, the scroll compressor includes a front housing and a middle housing, the low pressure chamber being formed between the front housing and the middle housing, the end cap being connected to the middle housing; a second bearing is arranged on the middle shell, and one end of the crankshaft is arranged on the second bearing; the oil return path comprises a first passage arranged between the fixed scroll and the end cover and a second passage arranged between the movable scroll and the middle shell; oil on the fixed scroll plate enters the low-pressure cavity after passing through the first channel, the second channel and the second bearing.

Further, the movable scroll is mounted on the crankshaft through a third bearing; and the oil liquid flows to the third bearing through the second channel.

Furthermore, a first bearing is arranged on the front shell, and the other end of the crankshaft is arranged on the first bearing relative to one end where the second bearing is arranged; the oil return circuit also comprises a third channel which is arranged on the crankshaft in a penetrating way, and at least part of the refrigeration oil flowing to the third bearing enters the low-pressure cavity after passing through the third channel and the first bearing.

The utility model discloses an oil return structure of scroll compressor through locating the separation piece in the exhaust chamber, separates the refrigeration oil and passes through the oil return oil circuit between exhaust chamber and the low pressure chamber, lubricates for bent axle and bearing to finally enter into the low pressure chamber, utilize the separation rate of refrigeration oil among the separation piece improvement oil-gas mixture, do benefit to the separation of the inside refrigeration oil of scroll compressor and refrigerant and the backward flow of fluid.

In addition, because the blocking piece comprises the blocking plate arranged on the end cover, and a circulation gap is reserved between the blocking plate and the end face, when an oil-gas mixture containing the refrigeration oil enters the exhaust cavity, the oil-gas mixture enters the other cavity from the circulation gap, the flow velocity of the high-pressure oil-gas mixture is changed, the refrigeration oil is separated out and is pressed into an oil return oil way to achieve oil return, and the purpose of lubrication is achieved.

In addition, the oil return oil circuit is a plurality of that arrange for the axis interval that encircles the bent axle for the oil return effect is better, and the oil return oil circuit of multichannel makes scroll compressor's inside oil return flow sufficient, and then can improve the refrigeration efficiency of system.

Another object of the utility model is to provide a scroll compressor, wherein be equipped with as above scroll compressor's oil return structure, through the oil return structure who adopts scroll compressor, can guarantee that the inside oil return of scroll compressor is sufficient, help scroll compressor life's improvement.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

fig. 1 is a schematic overall structural view of an oil return structure of a scroll compressor according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural diagram of a gasket according to a first embodiment of the present invention;

fig. 4 is a schematic view of an oil path on the middle housing according to the first embodiment of the present invention.

Description of reference numerals:

10. a base; 11. a front housing; 111. a first bearing; 12. a middle shell; 120. a second bearing; 121. an oil return groove; 122. a bearing bore; 13. a crankshaft; 14. an eccentric shaft; 140. a third bearing; 15. a movable scroll; 16. a fixed scroll; 160. an end face; 161. a gasket; 17. an end cap;

2. a low pressure chamber;

3. a compression chamber; 30. an exhaust hole;

4. an exhaust chamber; 400. a barrier plate; 401. a first chamber; 402. a second chamber;

501. a flow-through gap; 502. opening the gap; 503. a first channel; 504. a second channel; 505. a third channel.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features of the embodiments of the present invention may be combined with each other.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are to be construed as indicating or implying any particular importance.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be fixed, detachable, or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The embodiment relates to an oil return structure of a scroll compressor, which is arranged between an exhaust cavity 4 and a low-pressure cavity 2 of the scroll compressor in an integral structure. The exhaust cavity 4 is enclosed by a fixed scroll 16 and an end cover 17 of the scroll compressor.

In addition, the oil return structure is including locating the separation piece in the exhaust chamber 4 to and the oil return oil circuit of intercommunication exhaust chamber 4 and low pressure chamber 2, and the oil return oil circuit flows through bent axle 13 among the scroll compressor and moves the bearing on the vortex dish 15, the separation piece is used for blockking the oil-gas mixture that gets into exhaust chamber 4, because the vortex is blockked to the vortex of separation piece, make oil-gas mixture separation form mobile fluid layer and gas layer, the fluid that is arranged in the oil-gas layer of below flows back to in the low pressure chamber 2 through static vortex dish 16 and oil return oil circuit.

According to the structure, the blocking piece arranged in the exhaust cavity 4 separates the freezing oil in the oil-gas mixture, the freezing oil passes through the oil return oil way between the exhaust cavity 4 and the low-pressure cavity 2 to lubricate the crankshaft 13 and the bearing and finally enters the low-pressure cavity 2, the separation rate of the freezing oil in the oil-gas mixture is improved by using the blocking piece, the separation of the freezing oil and the refrigerant in the scroll compressor and the backflow of the oil liquid are facilitated, and the refrigeration efficiency of the system is improved.

Based on the above overall design, an exemplary structure of the oil return structure of the scroll compressor of the present embodiment is shown in fig. 1 and 2, the blocking member includes a blocking plate 400 disposed on the end cover 17, and a flow gap 501 is left between the blocking plate 400 and the end surface 160 at the top of the fixed scroll 16. The baffle plate 400 divides the exhaust cavity 4 into a plurality of chambers which are connected in sequence, and the chambers at the tail end and the exhaust port of the vortex compressor are communicated with the oil-gas mixture along the flowing direction of the oil-gas mixture.

It should be noted that the oil-gas mixture in this embodiment is composed of the refrigerant oil and the refrigerant. In addition, the baffle plate 400 has an annular cross section as a whole, is cylindrical, and is disposed coaxially with the crankshaft 13, and divides the discharge chamber 4 into a first chamber 401 inside the baffle plate 400 and a second chamber 402 outside the baffle plate 400, the compression chamber 3 of the scroll compressor communicates with the first chamber 401, and the discharge port of the scroll compressor is located on the end cover 17 and communicates with the second chamber 402.

When the scroll compressor works, the fixed scroll 16 and the movable scroll 15 compress the oil-gas mixture to enter the first chamber 401 from the exhaust hole 30, and as the flow gap 501 is formed between the baffle plate 400 and the end face 160 and the second chamber 402 is communicated with the exhaust hole, a turbulent flow phenomenon is formed in the process that the oil-gas mixture enters the first chamber 401 and enters the second chamber 402 from the flow gap 501, so that the flow velocity of the oil-gas mixture is changed, and layering is formed.

At this time, the refrigerant oil in the oil-liquid layer in the oil-gas mixture is separated and attached to the inner wall of the barrier plate 400 of the first chamber 401, and falls onto the end surface 160, flows into the oil return passage from the flow gap 501, and the gaseous mixture, mainly the refrigerant, is finally discharged from the discharge port. It can be understood that, based on the arrangement of the barrier plate 400, the end cover 17 has a double-layer cavity, so that there is a turbulent flow effect, thereby being capable of improving the separation rate of the refrigerant and the refrigeration oil.

In the present embodiment, an engagement portion is provided at an edge portion of the end surface 160, and the fixed scroll 16 is attached to the end cover 17 through the engagement portion. In order to smoothly discharge the oil on the end surface 160 in the discharge chamber 4, an oil passage is provided at the engaging portion of the fixed scroll 16, and this oil passage can be regarded as an initial stage of the return oil passage.

In order to ensure the sealing property between the end cap 17 and the fixed scroll 16, a seal gasket 161 is provided between the fitting portion and the end cap 17, a gap 502 is provided in the seal gasket 161, and the above-described oil passage is formed between the gap 502 and the fixed scroll 16. As can be seen from this, when the refrigerant oil flows out of the flow gap 501, it passes through the notch 502 between the mating portion and the end cap 17 and enters the oil return passage in full.

Referring to fig. 3, the sealing gasket 161 is circular, the edge of the sealing gasket 161 has a sealing protrusion which is concentric with the sealing protrusion, the inner side of the sealing protrusion has a concentric annular groove, and the opening 502 is formed on the sealing protrusion, so that when the refrigerant oil flows to the end surface 160, as shown in the flow direction of the refrigerant oil in fig. 2 and 3, the refrigerant oil flows through the groove first and then flows out from the opening 502 on the sealing protrusion, a part of the refrigerant oil enters the oil return path through the oil return groove 121, and the other part of the refrigerant oil directly enters the oil return path from the opening 502. Therefore, the refrigerating oil can enter the oil return path, and the sealing performance between the end cover 17 and the fixed scroll 16 can be ensured.

It should be noted that the oil return path is formed by pressing the end surface 160 of the fixed scroll 16 and the end cover 17 against the seal gasket 16, and since the fixed scroll 16 has the stepped end surface 160 and the end cover 17 has the stepped step matching the end surface 160, a gap is formed between the fixed scroll 16 and the end cover 17 due to the seal gasket 16, and the refrigerant oil can flow out from the two notches 502, so that the compressor has two oil return paths.

In addition, in order to improve the cooling efficiency of the system, as a preferred embodiment, the oil return path is a plurality of paths arranged at intervals around the axis of the crankshaft 13. In this embodiment, specifically, the oil return ports are three ports disposed on the gasket 161. The oil return effect can be better due to the plurality of oil return oil paths, the internal oil return flow of the scroll compressor is sufficient due to the multi-channel oil return oil paths, and the refrigeration efficiency of the system can be improved.

Referring back to fig. 1, the scroll compressor includes a base 10, a front housing 11 and a middle housing 12, the front housing 11 is provided on the base 10, the middle housing 12 is assembled and fixed with the front housing 11, and an end cap 17 is coupled to the middle housing 12. In addition, the low pressure chamber 2 is formed between the front case 11 and the middle case 12, the middle case 12 is provided with a second bearing 120, and one end of the crankshaft 13 is provided on the second bearing 120. Wherein, the second bearing 120 is a deep groove ball bearing, the second bearing 120 is assembled and fixed with the crankshaft 13, and the refrigerant oil can enter the second bearing 120 to lubricate the second bearing.

It should be noted that, the end surface of the middle casing 12 close to the movable scroll 15 is provided with an oil return groove 121, and the refrigerant oil will gradually fill the gap between the middle casing 12 and the movable scroll 15 as shown in fig. 4, enter the oil return groove 121, and be sucked into the second bearing 120 through the bearing hole 122 for the purpose of lubrication and temperature reduction.

In the present embodiment, as shown in fig. 1, the oil return path includes a first passage 503 provided between the fixed scroll 16 and the end cover 17, and a second passage 504 provided between the orbiting scroll 15 and the middle housing 12, and the oil on the end surface 160 enters the low pressure chamber 2 through the first passage 503, the second passage 504, and the second bearing 120. It is worth mentioning that there is a fitting gap between the second bearing 120 and the crankshaft 13, so that the refrigerant oil can flow into the low pressure chamber 2 through the fitting gap between the second bearing 120 and the crankshaft 13. Due to the plurality of gaps 502 formed in the gasket 161, the refrigerant oil can enter the low pressure chamber 2 from a plurality of channels, thereby reducing the risk of blockage. And the friction between the second bearing 120 and the crankshaft 13 is reduced.

Further, the orbiting scroll 15 is mounted on the crankshaft 13 through the third bearing 140, and the oil flows to the third bearing 140 through the second passage 504. Specifically, the eccentric shaft 14 is connected to the movable scroll 15, the eccentric shaft 14 is disposed on the crankshaft 13, the third bearing 140 is a movable disc sliding bearing and is disposed on the eccentric shaft 14, and the movable scroll 15 is driven by the eccentric shaft 14 to move relative to the fixed scroll 16 to compress the oil-gas mixture.

The front housing 11 is provided with a first bearing 111, and the other end of the crankshaft 13 is provided on the first bearing 111 with respect to the end where the second bearing 120 is provided. The oil return path further includes a third passage 505 formed through the crankshaft 13, and at least a part of the refrigerant oil flowing to the third bearing 140 enters the low pressure chamber 2 through the third passage 505 and the first bearing 111. It can be appreciated that the flow of the refrigeration oil from the first passage 503 to the second passage 504 and the lubrication of the second bearing 120 and the third bearing 140, followed by the lubrication of the first bearing 111 through the third passage 505, can slow the friction between the first bearing 111 and the second bearing 120 and the crankshaft 13, thereby improving scroll compressor performance and life.

In this embodiment, the low pressure chamber 2 stores the refrigeration oil, the low pressure chamber 2 communicates with the air inlet on the front housing 11, the refrigeration oil entering the low pressure chamber 2 can be fused with the refrigerant in the process that the air inlet enters the refrigerant, and the refrigeration oil enters the compression chambers 3 of the fixed scroll 16 and the movable scroll 15 to be compressed, and then enters the first chamber 401 through the exhaust hole 30, and then flows back after being separated in the exhaust chamber 4, so as to form a circulation.

The working process of the oil return structure of the scroll compressor in the embodiment is that the refrigerant circulates in the refrigeration system and is sucked by the air inlet, at this time, the refrigerant oil and the refrigerant are merged and enter the compression cavity 3 and enter the exhaust cavity 4 through the exhaust hole 30, the refrigerant oil is separated from the oil-gas mixture in the turbulence phenomenon, and the oil-gas mixture sequentially passes through the first channel 503, the second channel 504 and the third channel 505 and lubricates and cools the third bearing 140, the first bearing 111 and the second bearing 120, and finally the refrigerant oil and the refrigerant oil are merged into the low-pressure cavity 2 to enter the next circulation. When the compressor rotates at low speed or high speed, the refrigerant oil inside the scroll compressor can be well separated from the refrigerant, so that the oil liquid of the refrigerant oil flows back, and the refrigeration efficiency of the system can be improved.

Example two

The embodiment relates to a scroll compressor, wherein be equipped with like embodiment one scroll compressor's oil return oil circuit, through the oil return structure who adopts scroll compressor, can guarantee that the inside oil return of scroll compressor is sufficient, help scroll compressor life's improvement.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An oil return structure of a scroll compressor is arranged between an exhaust cavity (4) and a low-pressure cavity (2) of the scroll compressor, wherein the exhaust cavity (4) is formed by a fixed scroll (16) and an end cover (17) of the scroll compressor in an enclosing mode; the method is characterized in that:

the oil return structure comprises a blocking piece arranged in the exhaust cavity (4) and an oil return path communicated with the exhaust cavity (4) and the low-pressure cavity (2), and the oil return path flows through a crankshaft (13) in the scroll compressor and a bearing on a movable scroll (15);

the blocking piece is used for blocking the oil-gas mixture entering the exhaust cavity (4), separating the oil-gas mixture to form an oil layer and a gas layer, and enabling oil in the oil layer located below to flow back into the low-pressure cavity (2) through the fixed scroll (16) and the oil return oil way.

2. The oil return structure of a scroll compressor according to claim 1, wherein:

the blocking piece comprises a blocking plate (400) arranged on the end cover (17), and a circulation gap (501) is reserved between the blocking plate (400) and the end face (160) of the fixed scroll (16);

the blocking plate (400) divides the exhaust cavity (4) into a plurality of cavities which are connected in sequence, and the cavities at the tail end are communicated with an exhaust port of the scroll compressor along the flowing direction of the oil-gas mixture.

3. The oil return structure of a scroll compressor according to claim 2, wherein:

the baffle plate (400) is cylindrical and is coaxially arranged with the crankshaft (13), and the chambers comprise a first chamber (401) positioned inside the baffle plate (400) and a second chamber (402) positioned outside the baffle plate (400);

the compression chamber (3) of the scroll compressor is in communication with the first chamber (401), and the discharge port is in communication with the second chamber (402).

4. The oil return structure of a scroll compressor according to claim 2, wherein:

the edge part of the end surface (160) is provided with a matching part, and the fixed scroll (16) is arranged on the end cover (17) through the matching part;

the oil return oil way comprises an oil duct arranged at the matching part; the oil is discharged out of the exhaust cavity (4) through the oil passage.

5. The oil return structure of a scroll compressor according to claim 4, wherein:

a sealing gasket (161) is arranged between the matching part and the end cover (17), a notch (502) is formed in the sealing gasket (161), and the oil passage is formed between the notch (502) and the fixed scroll (16).

6. The oil return structure of a scroll compressor according to claim 1, wherein:

the oil return oil paths are arranged around the axis of the crankshaft (13) at intervals.

7. The oil return structure of a scroll compressor according to any one of claims 1 to 6, wherein:

the scroll compressor comprises a front housing (11) and a middle housing (12), the low pressure chamber (2) is formed between the front housing (11) and the middle housing (12), and the end cover (17) is connected to the middle housing (12);

a second bearing (120) is arranged on the middle shell (12), and one end of the crankshaft (13) is arranged on the second bearing (120);

the oil return path comprises a first channel (503) arranged between the fixed scroll (16) and the end cover (17), and a second channel (504) arranged between the movable scroll (15) and the middle shell (12);

oil on the fixed scroll (16) enters the low-pressure chamber (2) through the first passage (503), the second passage (504) and the second bearing (120).

8. The oil return structure of a scroll compressor according to claim 7, wherein:

the movable scroll (15) is mounted on the crankshaft (13) through a third bearing (140);

the oil flows through the second passage (504) onto the third bearing (140).

9. The oil return structure of a scroll compressor according to claim 8, wherein:

a first bearing (111) is arranged on the front shell (11), and the other end of the crankshaft (13) is arranged on the first bearing (111) relative to one end where the second bearing (120) is arranged;

the oil return circuit also comprises a third passage (505) which is arranged on the crankshaft (13) in a penetrating way, and at least part of the refrigeration oil which flows to the third bearing (140) enters the low-pressure cavity (2) after passing through the third passage (505) and the first bearing (111).

10. A scroll compressor characterized in that an oil return structure of the scroll compressor according to any one of claims 1 to 9 is provided in the scroll compressor.

Images