Motor assembly of a compressor and scroll compressor

Abstract

The application provides a motor assembly of a compressor and a scroll compressor. The motor assembly of the compressor comprises a crankshaft, a first balance block, a rotor and an oil separation assembly. The crankshaft penetrates the rotor, and the crankshaft is provided with the first balance block. The oil separation assembly comprises a first oil baffle and a second oil baffle. The second oil baffle is arranged on the first balance block, and the second oil baffle is arranged opposite to the first oil baffle. Air flow in the compressor comprises first air flow and second air flow. The second oil baffle is used for oil-gas separation of the first air flow flowing through the second oil baffle, and the first oil baffle is used for first oil-gas separation of the second air flow flowing through the first oil baffle. Part of the air flow after the first oil-gas separation flows through the second oil baffle after being combined with the first air flow. The application fully realizes multiple cycle oil separation, reduces the oil content when the refrigerant is discharged, and solves the problem of oil deficiency of the compressor caused by high oil content and slow oil return during high-frequency operation of the compressor.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a motor assembly for a compressor and a scroll compressor. Background Technology

[0002] The compressor is the heart of an air conditioning system, and its performance directly affects the air conditioner's energy efficiency ratio (EER). Scroll compressors are positive displacement compressors. An electric motor drives a crankshaft to rotate, and the moving scroll revolves around a stationary scroll under the crankshaft's influence, achieving periodic changes in the sealed volume to compress the gas. During gas compression and flow, refrigerant and lubricating oil undergo a certain degree of miscibility. When the compressor discharges gas, lubricating oil is expelled along with the refrigerant, leading to a reduction in the compressor's lubricating oil level. Excessive lubricating oil mixed with the refrigerant also reduces heat exchange efficiency, lowering energy efficiency. As scroll compressors develop towards larger displacement and higher speeds, the matching systems become increasingly larger, resulting in more lubricating oil being carried away per unit time, further exacerbating oil shortages and worsening energy efficiency.

[0003] Patent document 1 (CN204244003U) discloses a motor assembly for a compressor and a rotary compressor thereof, such as Figure 2 As shown, Patent Document 1 includes an oil baffle 4' and a rotor baffle 6'. The oil baffle 4' is located downstream of the rotor 2' to achieve oil blocking. The rotor baffle 6' is a magnetic fixed baffle and has no oil-distributing function; it only has an oil-distributing structure and is not limited in position. It also lacks an oil return structure, making it only suitable for rotary compressor structures that discharge from bottom to top, and not for scroll compressor structures that discharge from top to bottom. Patent Document 2 (CN102251966B) discloses an oil-blocking assembly and a rotary compressor having this assembly, such as... Figure 3 As shown, in Patent Document 2, the oil baffle 20 is disposed between the balance block 30 and the rotor 10 and is connected to the rotor 10. The rotor oil baffle cap 20 is disclosed, wherein the flange of 20 has 2-64 notches for oil ejection, has only one oil distribution structure, and has no restrictions on its position, nor any oil return structure. It is only suitable for rotary compressor structures that discharge from bottom to top, and not suitable for scroll compressor structures that discharge from top to bottom. Summary of the Invention

[0004] This invention provides a motor assembly for a compressor and a scroll compressor, which can solve the technical problem that existing compressors have poor oil-gas separation effect and cannot return oil in time when operating at high frequency.

[0005] The present invention provides a motor assembly for a compressor, including a crankshaft, a first balance block, a rotor, and an oil separator assembly;

[0006] The crankshaft passes through the rotor, and the first balance block is provided on the crankshaft. The rotor drives the crankshaft to rotate.

[0007] The oil separation assembly comprises a first oil baffle and a second oil baffle, the first oil baffle is arranged on the rotor, and the second oil baffle is arranged on the first balance block and is arranged opposite to the first oil baffle.

[0008] The airflow in the compressor comprises a first airflow and a second airflow, the second oil baffle is used for oil-gas separation of the first airflow flowing through the second oil baffle, and the first oil baffle is used for first oil-gas separation of the second airflow flowing through the first oil baffle; wherein part of the airflow after the first oil-gas separation flows through the second oil baffle after converging with the first airflow.

[0009] In some embodiments, the rotor has a flow-through hole penetrating through an end face thereof, a first gap is formed between a bottom of the first oil baffle and the rotor, the flow-through hole and the first gap are in communication to form a first passage, and the first passage is used for guiding the second airflow to the bottom of the first oil baffle.

[0010] In some embodiments, a stator is further included, a second passage is formed between the stator and the rotor, the second airflow in the first passage and the second passage converges and flows through the first oil baffle, and another part of the airflow after the first oil-gas separation flows back to the first passage and the second passage.

[0011] In some embodiments, a first support is further included, the crankshaft is arranged in the first support, and the first support is located above the first balance block.

[0012] The maximum distance between a bottom of the first support and a top end of the rotor is L, the distance between a bottom of the second oil baffle and the top end of the rotor is L1, and the distance between the bottom of the second oil baffle and a top of the first oil baffle is L2, wherein the maximum distance L, the distance L1 and the distance L2 satisfy: L1≥10mm, L2≥5mm, and L1 / L≤2 / 3.

[0013] In some embodiments, the first oil baffle comprises a first bottom plate and a first flange part, the first bottom plate is connected with the rotor, and the first flange part is arranged at a side edge of the first bottom plate and extends towards the first balance block.

[0014] In some embodiments, the first oil baffle further comprises an inner flange part, the first bottom plate has a first center through hole, the first flange part is arranged at a side edge of the first center through hole away from the first flange part, the inner flange part is opposite to the flange direction of the first flange part, and the inner flange part extends towards the rotor.

[0015] In some embodiments, the inner flange has a second gap with the crankshaft, the inner circumferential wall of the rotor is provided with a backflow hole, the backflow hole and the second gap form an oil leakage circuit, and the first bottom plate and the inner flange are connected by an oil guide slope.

[0016] In some embodiments, the second oil blocking piece includes a second bottom plate and a second flange, the second bottom plate is connected with the first balance block, the second bottom plate has a second center through hole, and the second center through hole and the first balance block form a third passage; the second flange is arranged at a side edge of the second bottom plate away from the rotor.

[0017] In some embodiments, a second balance block is further included, the first balance block and the second balance block are arranged at two ends of the crankshaft respectively, a third oil blocking piece is arranged on the second balance block, and the second gas flow sequentially flows through the third oil blocking piece and the second oil blocking piece.

[0018] In some embodiments, the third oil blocking piece includes a third bottom plate and a third flange, the third bottom plate is connected with the second balance block, the third bottom plate has a third center through hole, and the third center through hole and the crankshaft form a fourth passage; the third flange is arranged at a side edge of the third bottom plate, and the third flange extends towards the rotor.

[0019] A scroll compressor includes a motor assembly and a housing, the motor assembly is the motor assembly for the compressor described above, and the top of the housing is provided with a suction pipe, and the sidewall of the housing is provided with an exhaust pipe, so that the compressed gas is exhausted from top to bottom.

[0020] The motor assembly of the compressor and the scroll compressor provided by the application have the following beneficial effects:

[0021] The first balance block and the rotor of the application are respectively provided with a second oil blocking piece and a first oil blocking piece, and flow paths are respectively formed, the second gas flow flowing through the first oil blocking piece completes first oil-gas separation at the first oil blocking piece, the second oil blocking piece forms a negative pressure area at the bottom thereof, and part of the second gas flow after separation also combines with the first gas flow, flows through the first oil blocking piece to perform second oil-gas separation, and then the refrigerant with low oil content is discharged. The embodiment not only provides a corresponding oil blocking piece on the first balance block, but also provides a corresponding oil blocking piece on the rotor, fully utilizes the pressure difference, forms two circulation paths, and enables the oil-gas mixture to perform secondary oil-gas separation, realizes multiple oil separation cycles, significantly improves the oil-gas separation effect, reduces the oil content of the refrigerant when discharged, and solves the problem of compressor oil shortage caused by high oil content and slow oil return during high-frequency operation of the compressor. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without any creative effort.

[0023] Figure 1 A schematic view of a scroll compressor of a conventional structure;

[0024] Figure 2 A schematic view of the structure of Patent Document 1;

[0025] Figure 3 A schematic view of the structure of Patent Document 2;

[0026] Figure 4 A schematic view of the structure of the motor assembly of the present embodiment;

[0027] Figure 5 A schematic view of the first passage, the second passage, the third passage and the fourth passage of the present embodiment;

[0028] Figure 6 A schematic view of the maximum distance L, the distance L1 and the distance L2 of the present embodiment;

[0029] Figure 7 A schematic view of the structure of the rotor of the present embodiment;

[0030] Figure 8 A schematic view of the structure of the second oil baffle of the present embodiment;

[0031] Figure 9 A schematic view of the structure of the first oil baffle of the present embodiment;

[0032] Figure 10 A schematic view of the oil leakage passage of the present embodiment;

[0033] Figure 11 A schematic view of the structure of the third oil baffle of the present embodiment;

[0034] Figure 12 A schematic view of the structure of the scroll compressor of the present embodiment;

[0035] Figure 13 A schematic view of the oil content change of Scheme 1, Scheme 2 and Scheme 3;

[0036] Figure 14 A schematic view of the structure of the first oil baffle of another embodiment;

[0037] Figure 15 A schematic view of the structure of the first oil baffle and the second oil baffle of another embodiment.

[0038] Fig. 2'-rotor; 4'-oil baffle; 6'-rotor baffle; 1-crankshaft; 21-first balance weight; 22-second balance weight; 3-rotor; 301-flow-through hole; 302-backflow hole; 303-first fixing plate; 304-limiting column; 305-shaft hole; 306-closed slot; 307-second fixing plate; 41-first oil baffle; 411-first bottom plate; 412-first flange part; 413-inward flange part; 414-first center through hole; 415-oil guide slope; 42-second oil baffle; 421-second bottom plate; 422-second flange part; 423-second center through hole; 424-first oil leakage hole; 43-third oil baffle; 431-third bottom plate; 432-third flange part; 433-third center through hole; 434-second oil leakage hole; 435-annular gap; 401-first gap; 402-second gap; 501-first passage; 502-second passage; 503-third passage; 504-fourth passage; 505-oil leakage loop; 6-stator; 7-first support; 701-groove body; 8-housing; 91-inlet pipe; 92-exhaust pipe; 11-static disc; 12-moving disc; 13-oil pool. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort fall within the scope of protection of the present application.

[0040] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore cannot be understood as a limitation to the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0041] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative terms used herein interpreted accordingly.

[0042] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used only to distinguish one element from another, and are used subject to change only the context. Consequently, the use of such terms in the context of the present application are not intended as limitations of the present application's scope.

[0043] With reference to Figure 4 and Figure 5 According to the embodiment of the present application, a motor assembly of a compressor is provided, which comprises a crankshaft 1, a first balance block 21, a rotor 3 and an oil separation assembly. The crankshaft 1 penetrates the rotor 3, the first balance block 21 is arranged on the crankshaft 1, and the rotor 3 drives the crankshaft 1 to rotate. The oil separation assembly comprises a first oil baffle 41 and a second oil baffle 42. The first oil baffle 41 is arranged on the rotor 3, and the second oil baffle 42 is arranged on the first balance block 21 and oppositely arranged with the first oil baffle 41. The airflow in the compressor comprises a first airflow and a second airflow. The second oil baffle 42 is used for oil-gas separation of the first airflow flowing through the second oil baffle 42, and the first oil baffle 41 is used for first oil-gas separation of the second airflow flowing through the first oil baffle 41. Part of the airflow after the first oil-gas separation flows through the second oil baffle 42 after converging with the first airflow.

[0044] In the embodiment, during the compression process, the refrigerant gas and the lubricating oil in the pump body are mixed and mutually soluble. The refrigerant gas after the compression becomes a high-pressure oil-gas mixture. The discharged oil-gas mixture is subjected to oil-gas separation during the flow process. The flow direction of the oil-gas mixture is from top to bottom (with the oil-gas mixture flowing from the top to the bottom in the figure). Figure 5The first air flow will flow through the second oil baffle 42, and the second air flow will continue to flow downward and then upward during the rotation of the rotor 3, so that the second air flow flows through the rotor 3 and the first oil baffle 41 in turn. When the crankshaft 1 rotates at a high speed, the first balance block 21 rotates synchronously, and the first balance block 21 agitates the surrounding air to generate a pressure difference. The second oil baffle 42 rotates synchronously and forms a negative pressure area at the bottom of the second oil baffle 42, so that the first air flow can flow through the second oil baffle 42, and the oil in the oil-gas mixture is attached to the second oil baffle 42 by colliding with the second oil baffle 42. The rotor 3 rotates synchronously and also agitates the surrounding air to generate a pressure difference, so that the second air flow flows through the first oil baffle 41, and the oil in the oil-gas mixture is attached to the first oil baffle 41 by colliding with the first oil baffle 41.

[0045] Because the first balance block 21 and the rotor 3 are respectively provided with the second oil baffle 42 and the first oil baffle 41, and flow paths are formed, the oil-gas mixture flowing through the first oil baffle 41 completes the first oil-gas separation at the first oil baffle 41. The second oil baffle 42 forms a negative pressure area at the bottom of the second oil baffle 42, and also causes part of the second air flow to combine with the first air flow, so that the oil-gas mixture flows through the first oil baffle 41 for the second oil-gas separation, and then the refrigerant with a low oil content is discharged. In this embodiment, corresponding oil baffles are not only provided on the first balance block 21, but also provided on the rotor 3. The pressure difference is fully utilized to form two oil-gas separation paths, so that the oil-gas mixture can be subjected to secondary oil-gas separation, multiple oil separation cycles are realized, the oil-gas separation effect is significantly improved, and the oil content of the refrigerant discharged is reduced, thereby solving the problem of oil shortage of the compressor caused by high oil content and slow oil return during high-frequency operation of the compressor.

[0046] As a specific implementation, the first oil baffle 41 can be provided on the crankshaft 1 or the rotor 3. Preferably, the first oil baffle 41 is provided on the rotor 3, the first oil baffle 41 is connected to the top end of the rotor 3, the bottom of the first oil baffle 41 is in contact with the top end of the rotor 3, and a gap can also be left between the bottom of the first oil baffle 41 and the top end of the rotor 3.

[0047] For reference, Figure 4 , Figure 5 and Figure 7 , the rotor 3 has a flow-through hole 301 penetrating the end surface thereof, the first gap 401 is between the bottom of the first oil baffle 41 and the top end of the rotor 3, the flow-through hole 301 and the first gap 401 are in communication to form a first passage 501, and the first passage 501 is used to guide the second air flow to the bottom of the first oil baffle 41.

[0048] Specifically, the second airflow flowing downward flows into the bottom end of the rotor 3, and the rotor 3 agitates the surrounding air during rotation, and the second airflow first flows into the first passage 501, and due to the existence of the first gap 401, a negative pressure area is formed at the bottom of the first oil baffle 41, and the second airflow in the first passage 501 flows into the first gap 401 and collides with the bottom of the first oil baffle 41, and then flows outward. In this embodiment, the rotor 3 is provided with the flow-through hole 301 and the first oil baffle 41, and a gap is left between the first oil baffle 41 and the rotor 3, so that the oil-gas mixture can first flow through the bottom of the first oil baffle 41, increasing the flow path of the oil-gas mixture, so that the oil-gas mixture is fully contacted and collided with the first oil baffle 41.

[0049] As a specific embodiment, a plurality of arrayed flow-through holes 301 are arranged along the circumference of the rotor 3, and each flow-through hole 301 is in communication with the first gap 401 during rotation of the rotor 3, thereby forming a plurality of first passages 501, so that the oil-gas mixture can be fully contacted with the rotor 3, avoiding concentrated airflow inflow, and improving the oil-gas separation effect.

[0050] In another embodiment, the bottom of the first oil baffle 41 is in contact with the top end of the rotor 3, and a hole is formed in the first oil baffle 41 and is in communication with the first passage 501, and the second airflow in the first passage 501 does not flow through the bottom of the first oil baffle 41, but is combined with the first airflow. This arrangement can also achieve secondary oil-gas separation.

[0051] For reference Figure 4 and Figure 5 As shown, the stator 6 is further included, and a second passage 502 is formed between the inner circle of the stator 6 and the outer circle of the rotor 3, the second passage 502 is located radially outward of the first passage 501, and the second airflow in the first passage 501 and the second passage 502 is combined and flows through the outer edge of the first oil baffle 41, so that part of the airflow after the first oil-gas separation is combined with the first airflow and flows through the second oil baffle 42, and another part of the airflow after the first oil-gas separation flows back to the first passage 501 and the second passage 502.

[0052] Specifically, the downwardly flowing second gas stream first flows to the bottom end of the rotor 3, and in the process of rotation of the rotor 3, the second gas stream flows into the first passage 501 and the second passage 502 and flows upward, wherein the oil-gas mixture in the second passage 502 always flows upward, and the oil-gas mixture in the first passage 501 first flows through the bottom of the first oil baffle 41 and then flows outward under the action of centrifugal force, thereby converging with the oil-gas mixture flowing upward in the second passage 502. The converged oil-gas mixture flows through the outer edge of the first oil baffle 41 to perform the first oil-gas separation, and part of the oil-gas mixture after the first oil-gas separation converges with the first gas stream to perform the second oil-gas separation, while another part of the oil-gas mixture after the first oil-gas separation flows outward and converges with the second gas stream that has not been subjected to oil-gas separation to continue to flow downward and then flow into the first passage 501 and the second passage 502 to circulate. The first oil baffle 41 in the present embodiment not only enables the oil-gas mixture in the first passage 501 to contact and collide with the first oil baffle 41, but also combines the first passage 501 and the second passage 502 to form two passages, so that a large amount of oil-gas mixture can pass through to improve the oil-gas separation efficiency. Secondly, under the joint action of the first oil baffle 41 and the second oil baffle 42, the second gas stream can be divided into two streams to perform the second oil-gas separation.

[0053] It is worth noting that when the second gas stream only flows into the first passage 501, the second gas stream in the first passage 501 flows through the bottom of the first oil baffle 41 and then flows through the outer edge of the first oil baffle 41 to perform the first oil-gas separation; when the second gas stream flows into the first passage 501 and the second passage 502, the second gas stream in the two passages converges first and then flows through the outer edge of the first oil baffle 41 to perform the first oil-gas separation.

[0054] As a specific implementation, when the motor assembly is arranged in the housing 8, part of the oil-gas mixture after compression flows into the first chamber of the housing 8, that is, the first gas stream flows into the first chamber of the housing 8 and flows through the second oil baffle 42, and another part of the oil-gas mixture, that is, the second gas stream, flows from the gap between the stator 6 and the housing 8 to the bottom of the compressor, and in the process of rotation of the first oil baffle 41, the second gas stream flows from bottom to top into the first passage 501 and the second passage 502.

[0055] For reference Figure 4 , Figure 5 and Figure 6As shown, the first support 7 is arranged above the first balance weight 21, the maximum distance between the bottom of the first support 7 and the top end of the rotor 3 is L, the distance between the bottom of the second oil baffle 42 and the top end of the rotor 3 is L1, and the distance between the bottom of the second oil baffle 42 and the top of the first oil baffle 41 is L2. Here, the rotor 3 can also refer to the motor core, wherein the maximum distance L, the distance L1 and the distance L2 satisfy: L1≥10mm, L2≥5mm, and L1 / L≤2 / 3.

[0056] As a specific embodiment, the bottom of the first support 7 is configured with a groove body 701, and specifically, the maximum distance between the top of the groove body 701 and the top end of the rotor 3 is L. It should be noted that the groove body 701 is a structure that the first support 7 itself has, and experiments have shown that the maximum distance L is limited with the groove body 701 as the reference object.

[0057] Specifically, the first oil baffle 41 and the second oil baffle 42 of the present embodiment have a position requirement, that is, the first oil baffle 41 and the second oil baffle 42 must satisfy a certain distance requirement to form multiple cycles of oil separation. Referring to FIG. 13 and Table 1, the part of the gas flow after the first oil-gas separation flows through the second oil baffle 42 after being combined with the first gas flow, and the position of the first support 7, the first oil baffle 41 and the second oil baffle 42 is related. When the position relationship of the three satisfies: L1≥10mm, L2≥5mm, and L1 / L≤2 / 3, the oil content is significantly reduced, and the oil-gas separation effect of the mixture is best.

[0058]

[0059]

[0060] Table 1

[0061] In the present embodiment, in order to further improve the oil-gas separation effect of the mixture, in addition to reasonably setting the positions of the first oil baffle 41 and the second oil baffle 42, the first oil baffle 41 and the second oil baffle 42 in the present embodiment can be common plate structure oil baffles, or oil baffles with a flange structure.

[0062] Referring to Figure 8As shown, the second oil blocking member 42 comprises a second bottom plate 421 and a second flange portion 422. The second bottom plate 421 has a second central through hole 423, and the second bottom plate 421 is connected with the first balance block 21. The diameter of the second central through hole 423 is larger than the diameter of the crankshaft 1, and a certain gap is left between the second bottom plate 421 and the outer wall of the crankshaft 1. The bottom of the second bottom plate 421 forms a negative pressure area, so that the third passage 503 is formed between the second central through hole 423 and the outer wall of the first balance block 21. The second flange portion 422 is arranged at the side edge of the second bottom plate 421 away from the rotor 3. The height of the second flange portion 422 in the axial direction is adapted to the first balance block 21, and the height is preferably lower than the top of the first balance block 21, but it is wrapped around most of the first balance block 21 to ensure that the airflow has sufficient flow path length.

[0063] Specifically, when the first balance block 21 agitates the surrounding air, due to the downward flow of the first airflow, the oil-gas mixture first flows through the outer wall of the second flange portion 422 to collide, so that the oil droplets adhere to the outer wall of the second flange portion 422. Under the action of the pressure difference, the oil-gas mixture flows into the second flange portion 422 from the gap between the second bottom plate 421 and the outer wall of the crankshaft 1, collides with the inner wall of the second flange portion 422, and the oil droplets adhere to the inner wall of the second flange portion 422. Compared with the single plate structure oil blocking cap, the second flange portion 422 is arranged to prolong the flow path of the oil-gas mixture, so that the oil-gas mixture is fully separated during flow, the oil return amount is increased, and the pressure difference is easy to generate during the rotation of the second oil blocking member 42.

[0064] As a specific embodiment, a plurality of first oil leakage holes 424 are arranged on the second bottom plate 421. The first oil leakage holes 424 are arranged in the circumferential direction of the second bottom plate 421, and the first oil leakage holes 424 are arranged close to the second flange portion 422. When the oil-gas mixture flows into the second flange portion 422 and is fully separated, the oil droplets adhere to the inner wall of the second flange portion 422. With the rotation of the second oil blocking member 42, the oil droplets gradually flow downward and flow out of the second oil blocking member 42 through the first oil leakage holes 424 for collection.

[0065] As a specific embodiment, the second bottom plate 421 is connected with the first balance block 21 by a pin or a screw. The second flange portion 422 wraps around the first balance block 21, and the pin or the screw is used to connect the second flange portion 422 with the first balance block 21 to prevent the second oil blocking member 42 from being separated from the first balance block 21 during rotation. Figure 5 and Figure 9 As shown, the first oil blocking member 41 comprises a first bottom plate 411 and a first flange portion 412. The first bottom plate 411 is connected with the rotor 3. The first flange portion 412 is arranged at the side edge of the first bottom plate 411, and the first flange portion 412 extends towards the first balance block 21.

[0066] Specifically, in the process of rotating the rotor 3, the second airflow flows from bottom to top, and flows through the first bottom plate 411 and the first flange portion 412 to complete the first oil-gas separation. In this embodiment, the first flange portion 412 is arranged to increase the flow path of the oil-gas mixture, and in the process of rotating the first oil retaining member 41, the oil-gas mixture can fully contact and collide with the first flange portion 412, thereby increasing the contact area of the oil-gas mixture with the first oil retaining member 41.

[0067] As a specific embodiment, the first bottom plate 411 forms a first gap 401 with the top end of the rotor 3, the oil-gas mixture in the first passage 501 flows upwards, first flows through the first bottom plate 411, and then flows outward after contacting and colliding with the first bottom plate 411. At the same time, the oil-gas mixture in the second passage 502 always flows upwards, and the oil-gas mixture in the first passage 501 and the oil-gas mixture in the second passage 502 converge and then flow through the first flange portion 412 to complete the first oil-gas separation. After the first oil retaining member 41 performs the first oil-gas separation, part of the oil-gas mixture converges with the first airflow to perform the second oil-gas separation, and another part of the oil-gas mixture flows outward and converges with the second airflow that has not been subjected to oil-gas separation.

[0068] As a specific embodiment, the first bottom plate 411 is connected to the rotor 3 by a pin, and the pin has a stepped structure, so that the first bottom plate 411 leaves a first gap 401 with the top end of the rotor 3.

[0069] As a specific embodiment, the top end of the rotor 3 is provided with a first fixed plate 303, and the pin connects the first bottom plate 411 and the first fixed plate 303 in sequence. The first fixed plate 303 plays a role in limiting the axial direction of the rotor 3. In another embodiment, a plurality of limiting columns 304 are arranged on the first fixed plate 303, the first bottom plate 411 is installed on the limiting columns 304, and the pin connects the first bottom plate 411 and the limiting columns 304, so that the first bottom plate 411 leaves a first gap 401 with the top end of the rotor 3.

[0070] In this embodiment, the existence of the first gap 401 causes the bottom of the first bottom plate 411 to form a negative pressure, thereby changing the conventional direct contact between the first bottom plate 411 and the rotor 3, and changing the flow direction of the oil-gas mixture.

[0071] For reference Figure 9 As shown in the figure, the first oil retaining member 41 further includes an inner flange portion 413, the first bottom plate 411 has a first center through hole 414, the first flange portion 412 is arranged on the side edge of the first center through hole 414 away from the first flange portion 412, the inner flange portion 413 is opposite to the flange direction of the first flange portion 412, and the inner flange portion 413 extends towards the rotor 3.

[0072] Specifically, the inwardly turned edge 413 plays a role of blocking airflow, the first oil baffle 41 rotates, when the second airflow in the first passage 501 flows upward into the first gap 401, the oil-gas mixture flows outward in the radial direction, the inwardly turned edge 413 is arranged to prevent the oil-gas mixture from flowing out of the first central through hole 414, to make the oil-gas mixture flow outward, and to form a negative pressure area at the bottom of the first bottom plate 411, to promote the upward flow of the oil-gas mixture.

[0073] Specifically, the inwardly turned edge 413 plays a role of oil leakage, in the process of rotation of the rotating shaft, the first oil baffle 41 and the second oil baffle 42 rotate synchronously, the second oil baffle 42 is arranged above the first oil baffle 41, and the oil separated from the oil-gas mixture flows back to the oil pool 13 at the bottom of the compressor, the oil adhering to the second oil baffle 42 drips downward, that is, the oil on the second bottom plate 421 and the second turned edge 422 drips downward, the second bottom plate 421 is provided with a plurality of first oil leakage holes 424, so that the oil on the second oil baffle 42 first flows back to the first oil baffle 41, the first oil baffle 41 also has oil adhering in the process of rotation, and the oil drips on the first bottom plate 411 and then flows downward through the inwardly turned edge 413. In this embodiment, the inwardly turned edge can timely flow out the oil droplets adhering to the first oil baffle 41, to avoid oil accumulation.

[0074] Referring to Figure 9 and Figure 10 It is shown that the inwardly turned edge 413 has a second gap 402 with the crankshaft 1, the inner peripheral wall of the rotor 3 is provided with a plurality of backflow holes 302, the backflow holes 302 are communicated with the second gap 402 to form an oil leakage circuit 505, and the first bottom plate 411 and the inwardly turned edge 413 are connected through an oil guide slope 415, and the oil guide slope 415 makes the first bottom plate 411 transition to the inwardly turned edge 413.

[0075] Specifically, the oil drips on the first bottom plate 411, flows to the inwardly turned edge along the oil guide slope 415, the oil drips flow into the backflow holes 302 due to the second gap 402 between the inwardly turned edge 413 and the crankshaft 1, and the oil drips continuously flow downward and flow back to the oil pool 13 at the bottom of the compressor. In this embodiment, the flow direction of the oil-gas mixture in the first passage 501 is opposite to the flow direction of the oil drips in the oil leakage circuit 505, the backflow path of the oil drips and the flow path of the oil-gas mixture do not interfere with each other, and the oil leakage circuit 505 can avoid oil droplet accumulation, to make the accumulated oil flow back in a guided manner.

[0076] As a specific embodiment, the rotor 3 has a shaft hole 305, the inner peripheral wall of the rotor 3 is provided with a plurality of arrayed backflow holes 302, the backflow holes 302 are semicircular structures, and the backflow holes 302 are communicated with the shaft hole 305, which makes the oil drips on the inwardly turned edge 413 flow smoothly into the backflow holes 302.

[0077] As a specific embodiment, the top end of the rotor 3 is provided with a converging groove 306, which is communicated with the backflow hole 302, and the bottom of the inward flange part 413 extends into the converging groove 306, so that the oil droplets on the inward flange part 413 can be concentrated and guided into the backflow hole 302.

[0078] Referring to Figure 11 It is also shown that the second balance block 22 is arranged at the two ends of the crankshaft 1, respectively, and the third oil blocking part 43 is arranged on the second balance block 22, and the airflow flows through the third oil blocking part 43 and the second oil blocking part 42 in sequence.

[0079] Specifically, in the rotating process of the first balance block 21 and the second balance block 22, the first oil blocking part 41 and the third oil blocking part 43 rotate synchronously, the second airflow without oil-gas separation flows from top to bottom to the bottom end of the rotor 3, flows through the third oil blocking part 43 first and then flows into the first passage 501 and the second passage 502, and the oil-gas mixture also performs oil-gas separation on the third oil blocking part 43. In this embodiment, the first oil blocking part 41 and the third oil blocking part 43 are arranged at the two ends of the rotor 3, respectively, so that the oil-gas mixture performs oil-gas separation once before flowing to the first oil blocking part 41, reducing the oil content in the oil-gas mixture. The entire shafting assembly is provided with oil blocking parts at different heights in the axial direction of the crankshaft 1, which can separate oil and gas for oil-gas mixtures with different flow directions, and form multiple and multi-cycle oil separation paths, improve the oil separation effect, and reduce the oil content in the oil-gas mixture.

[0080] Referring to Figure 5 and Figure 9 It is also shown that the third oil blocking part 43 includes a third bottom plate 431 and a third flange part 432, the third bottom plate 431 is connected with the second balance block 22, the third bottom plate 431 has a third center through hole 433, and the third center through hole 433 forms a fourth passage 504 with the crankshaft 1; the third flange part 432 is arranged at one side edge of the third bottom plate 431, and the third flange part 432 extends towards the rotor 3.

[0081] Specifically, the third flange portion 432 wraps the second balance block 22, and when the second balance block 22 and the rotor 3 agitate the surrounding air, the oil-gas mixture flowing from top to bottom under the action of pressure difference flows in the radial direction from outside to inside, part of the oil-gas mixture collides to generate a collision with the outer wall of the third flange portion 432, so that the oil droplets adhere to the outer wall of the third flange portion 432, and then the oil-gas mixture flows into the second passage 502; another part of the oil-gas mixture flows into the third flange portion 432 from the gap between the third bottom plate 431 and the outer wall of the crankshaft 1, and then flows into the first passage 501. Compared with the single plate structure oil blocking cap, the third flange portion 432 is further provided, which can prolong the flow path of the oil-gas mixture, fully separate the oil-gas mixture during the flow of the oil-gas mixture, increase the oil return amount, and easily generate a pressure difference during the rotation of the third oil blocking piece 43, so that the oil-gas mixture flows into the first passage 501 and the second passage 502, respectively.

[0082] As a specific embodiment, a plurality of second oil leakage holes 434 are provided on the third bottom plate 431, which can return the oil droplets dripping on the third flange portion 432 to the oil pool 13. Secondly, the oil droplets returned from the oil leakage circuit 505 can also be returned to the oil pool 13 through the second oil leakage holes 434 if they fall on the third bottom plate 431 and the third flange portion 432.

[0083] As a specific embodiment, the bottom end of the rotor 3 is provided with a second fixing plate 307, and the third bottom plate 431, the second balance block 22 and the second fixing plate 307 are connected by a pin or a screw to prevent the third oil blocking piece 43 from being separated from the second balance block 22.

[0084] As a specific embodiment, a third center through hole 433 is provided on the third bottom plate 431, the diameter of the third center through hole 433 is greater than the diameter of the crankshaft 1, an annular gap 435 is formed between the third center through hole 433 and the outer wall of the crankshaft 1, the surface area of the annular gap 435 is S1, and the total surface area of the cross section of the flow-through hole 301 is S2. The surface area S1 is greater than the total surface area S2. This arrangement ensures that the airflow flowing to the third oil blocking piece 43 can move upward in time. If the surface area S1 is too small, a negative pressure will be formed at the bottom of the third oil blocking piece 43, causing poor airflow and causing the second circulation to fail.

[0085] As a specific embodiment, only the second oil blocking piece 42 and the third oil blocking piece 43 can be provided on the first balance block 21 and the second balance block 22, respectively. This arrangement makes the first airflow flow through the second oil blocking piece 42 and the second airflow flow through the third oil blocking piece 43, and the oil-gas separation effect is poorer than that of simultaneously providing the first oil blocking piece 41, the second oil blocking piece 42 and the third oil blocking piece 43.

[0086] As another embodiment, in combination with the aboveFigure 14 As shown, the first oil baffle 41 comprises a first bottom plate 411 and a first flange portion 412, the first flange portion 412 is vertically connected with the outer edge of the first bottom plate 411, Figure 5 As shown in the embodiment, the connection between the first flange portion 412 and the outer edge of the first bottom plate 411 has a certain slope, and the embodiment is compared with Figure 5 As shown in the embodiment, the oil leakage effect is poor, Figure 5 The first oil baffle 41 shown is a preferred embodiment.

[0087] As another embodiment, in combination with Figure 15 As shown, the first oil baffle 41 comprises a first bottom plate 411 and a first flange portion 412, the first flange portion 412 is vertically connected with the outer edge of the first bottom plate 411; the second oil baffle 42 comprises a second bottom plate 421 and a second flange portion 422, the second bottom plate 421 is connected with the first balance block 21, the hole diameter of the second center through hole 423 is slightly larger than the diameter of the crankshaft 1, after the second bottom plate 421 is connected with the first balance block 21, there is no gap between the second bottom plate 421 and the first balance block 21, that is, the airflow does not enter the second oil baffle 42, and the bottom of the second bottom plate 421 forms a negative pressure area; the second flange portion 422 is arranged at the side edge of the second bottom plate 421 away from the rotor 3, the height of the second flange portion 422 in the axial direction is adapted to the first balance block 21, and the height is preferably lower than the top of the first balance block 21, but it is wrapped around most of the first balance block 21 to ensure that the airflow has sufficient flow path length. The embodiment is compared with Figure 5 As shown in the embodiment, the structures of the first oil baffle 41 and the second oil baffle 42 are different from Figure 14 The embodiment is compared with only the structure of the second oil baffle 42 is different.

[0088] Specifically, when the first balance block 21 agitates the surrounding air, due to the downward flow of the first airflow, the oil-gas mixture collides with the outer wall of the second flange portion 422 to make the oil droplets adhere to the outer wall of the second flange portion 422; at the same time, after the first oil baffle 41 performs the first oil-gas separation, part of the oil-gas mixture flows to the bottom of the second bottom plate 421 and then flows outward to combine with the first airflow for the second oil-gas separation, and the other part of the oil-gas mixture flows outward to combine with the second airflow which has not been subjected to oil-gas separation. The arrangement of the embodiment can also separate the oil-gas mixture, the oil-gas mixture does not flow through the inside of the second flange portion 422, but only collides with the outside of the second flange portion 422, in addition, the negative pressure area generated at the bottom of the second bottom plate 421 enables the part of the oil-gas mixture after the first oil-gas separation to flow through the second bottom plate 421 and collide with the second bottom plate 421 for oil-gas separation. The scheme adopted in the embodiment is compared with Figure 5The first oil blocking part 41 has poor oil leakage effect, and the second oil blocking part has poor oil separation effect. Figure 5 The structure of the first oil blocking part 41 and the second oil blocking part 42 is a preferred embodiment.

[0089] For reference Figure 12 As shown, a scroll compressor includes a motor assembly and a housing 8, the motor assembly is the motor assembly for the compressor described above, the top of the housing 8 is provided with a suction pipe 91, the side wall of the housing 8 is provided with an exhaust pipe 92, so that the compressed gas is discharged from top to bottom, the housing 8 includes a first first chamber and a second chamber, the first chamber is located in the upper part of the housing 8, the second chamber is located in the lower part of the housing 8, the compression component is located in the first chamber, the stator 6 and the rotor 3 are located in the second chamber.

[0090] The refrigerant gas after heat exchange from the air conditioning system enters the compressor suction pipe 91, the refrigerant gas enters the inside of the pump body static disc 11 and the dynamic disc 12 for compression, and at the same time, the refrigerant gas is mixed and dissolved with the lubricating oil in the pump body during the compression process, the compressed refrigerant gas changes from low pressure gas to high pressure oil gas mixture; the high pressure oil gas mixture is discharged downward from the flow guide groove of the outer circle of the static disc 11 and the first support 7, the discharged first gas flow flows downward through the edge gap on the outer circle of the stator 6, the second gas flow enters the first chamber, and the oil gas mixture flowing downward enters the first chamber upward through the gap between the stator 6 and the rotor 3 after passing through the second chamber. The oil gas mixture is separated during the flow process, and the oil gas mixture in the first chamber is separated by the first balance block 21, and the separated oil gas mixture is discharged through the exhaust pipe 92 and enters the air conditioning system.

[0091] The conventional scroll compressor mainly realizes the oil separation purpose by changing the flow direction or flow speed of the oil gas mixture discharged from the pump body, and the traditional optimization method is to increase the oil blocking cap or the exhaust guide plate on the shaft system. With the increasing displacement and the increasing speed of the scroll compressor, the separated oil cannot quickly and timely pass through the motor to the bottom oil pool 13, and the oil accumulated on the upper surface of the motor is mixed with the gas flow again, which leads to the high oil circulation rate of the scroll compressor, and the oil circulation rate of the air conditioning system will increase, which will lead to the decrease of the heat exchange effect of the air conditioning heat exchanger and the decrease of the actual capacity of the air conditioner. At the same time, it will lead to the oil-free state in the compressor, which will reduce the reliability of the compressor. The increase of the oil circulation rate represents that the suction volume of the compressor will be partially replaced by the refrigeration oil, which will reduce the refrigeration capacity of the compressor, and in severe cases, the suction of the refrigeration oil will also lead to the fragmentation of the scroll disc of the compressor, which will directly cause the failure of the scroll compressor.

[0092] In addition, the vertical scroll compressor discharges gas from the upper end of the pump body, and the gas is discharged downward into the first chamber through the first support 7, and the exhaust pipe 92 is located at the first chamber. If the upper and lower chamber circulation shunts are not formed, the gas flow will be directly discharged from the exhaust pipe 92 without sufficient oil-gas separation, resulting in a particularly high oil circulation rate, and the compressor will be out of oil at high frequency. If the flat oil retaining cap has no flange and is arranged on the rotor 3, the oil and gas entering the first chamber cannot flow from the outer side to the inner side to achieve the oil separation effect. If negative pressure cannot be formed in the first chamber and the second chamber, the gas flow circulation of the upper and lower chambers of the motor cannot be formed. In order to solve the problem of oil-gas mixing of the scroll compressor during high-speed operation, the compressor needs to be designed with an oil-gas separation device inside to reduce the oil content and improve the energy efficiency and reliability. The conventional structure is designed with a flange structure of the second oil retaining member 42 on the side of the first balance block 21 at the upper end of the crankshaft 1, as shown in Figure 1 The oil retaining member generates an upper and lower pressure difference by rotation to achieve the effect of oil-gas separation of the fluid flow in the chamber. When operating at high frequency, the oil-gas separation effect decreases, and the compressor may be out of oil.

[0093] The second oil retaining member 42, the first oil retaining member 41 and the third oil retaining member 43 are arranged in the axial direction of the crankshaft 1 in sequence, and the first oil retaining member 41 and the third oil retaining member 43 on the rotor 3 assembly side can separate the oil and gas once, and the second oil retaining member 42 on the side of the first balance block 21 can separate the oil and gas twice. By designing the positions of the three oil retaining members in the compressor and the gas flow channel, the combined three oil retaining member structure can achieve multiple circulation oil separation in the chamber of the compressor, and solve the problem of high oil content and slow oil return of the scroll compressor during high-frequency operation.

[0094] It is worth noting that in the present embodiment, the rotating second oil retaining member 42, the first oil retaining member 41 and the third oil retaining member 43 can throw the oil droplets attached to the outer wall to the inner wall of the housing 8, and the oil droplets flow along the inner wall of the housing 8 to the oil pool 13 at the bottom of the compressor.

[0095] It is easy for those skilled in the art to understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0096] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications shall be regarded as the protection scope of the present application.

Claims

1. A motor assembly for a compressor, characterized in that, include: Crankshaft (1), first balance block (21), rotor (3) and oil distribution assembly; The crankshaft (1) passes through the rotor (3), and the first balance block (21) is provided on the crankshaft (1). The rotor (3) drives the crankshaft (1) to rotate. The oil distribution assembly includes a first oil baffle (41) and a second oil baffle (42). The first oil baffle (41) is disposed on the rotor (3). The second oil baffle (42) is disposed on the first balance block (21). The second oil baffle (42) is disposed opposite to the first oil baffle (41). The airflow inside the compressor includes a first airflow and a second airflow. The second oil baffle (42) is used to separate the first airflow flowing through the second oil baffle (42) into oil and gas. The first oil baffle (41) is used to perform a first oil and gas separation on the second airflow flowing through the first oil baffle (41). The part of the airflow after the first oil and gas separation merges with the first airflow and flows through the second oil baffle (42). The first oil baffle (41) includes a first base plate (411) and a first flange (412). The first base plate (411) is connected to the rotor (3). The first flange (412) is disposed on one side edge of the first base plate (411) and extends toward the first balance block (21). The first oil baffle (41) also includes an inner flange (413). The first base plate (411) has a first central through hole (414). The first flange (412) is disposed on one side edge of the first central through hole (414) away from the first flange (412). The inner flange (413) has the opposite flange direction to the first flange (412) and extends toward the rotor (3). The second oil baffle (42) is positioned above the first oil baffle (41). The oil adhering to the second oil baffle (42) drips downwards and falls onto the first base plate (411) before being guided downwards through the inner flange (413).

2. The motor assembly of the compressor according to claim 1, characterized in that, The rotor (3) has a flow hole (301) through its end face. The bottom of the first oil baffle (41) and the rotor (3) have a first gap (401). The flow hole (301) and the first gap (401) are connected to form a first passage (501). The first passage (501) is used to guide the second airflow to the bottom of the first oil baffle (41).

3. The motor assembly of the compressor according to claim 2, characterized in that, It also includes a stator (6), the outer circle of the stator (6) and the inner circle of the rotor (3) form a second passage (502), the second airflow in the first passage (501) and the second passage (502) merges and flows through the first oil baffle (41), and the other part of the airflow after the first oil-gas separation flows back to the first passage (501) and the second passage (502).

4. The motor assembly of the compressor according to claim 1, characterized in that, It also includes a first bracket (7), in which the crankshaft (1) passes through the first bracket (7), and the first bracket (7) is located above the first balance block (21); The maximum distance between the bottom of the first bracket (7) and the top of the rotor (3) is L, the distance between the bottom of the second oil baffle (42) and the top of the rotor (3) is L1, and the distance between the bottom of the second oil baffle (42) and the top of the first oil baffle (41) is L2. The maximum distance L, distance L1 and distance L2 satisfy: L1≥10mm, L2≥5mm, and L1 / L≤2 / 3.

5. The motor assembly of the compressor according to claim 1, characterized in that, The inner flange (413) has a second gap (402) with the crankshaft (1), and a return hole (302) is provided on the inner peripheral wall of the rotor (3). The return hole (302) is connected to the second gap (402) to form an oil leakage circuit (505), and the first base plate (411) and the inner flange (413) are connected by an oil guide slope (415).

6. The motor assembly of the compressor according to claim 1, characterized in that, The second oil baffle (42) includes a second base plate (421) and a second flange (422). The second base plate (421) is connected to the first balance block (21). The second base plate (421) has a second central through hole (423). The second central through hole (423) and the first balance block (21) form a third passage (503). The second flange (422) is located on the edge of the second base plate (421) away from the rotor (3).

7. The motor assembly of the compressor according to claim 1, characterized in that, It also includes a second balance block (22), the first balance block (21) and the second balance block (22) are respectively disposed at both ends of the crankshaft (1), and a third oil baffle (43) is disposed on the second balance block (22), and the second airflow flows through the third oil baffle (43) and the second oil baffle (42) in sequence.

8. The motor assembly of the compressor according to claim 7, characterized in that, The third oil baffle (43) includes a third base plate (431) and a third flange (432). The third base plate (431) is connected to the second balance block (22). The third base plate (431) has a third central through hole (433). The third central through hole (433) forms a fourth passage (504) with the crankshaft (1). The third flange (432) is located on one side edge of the third base plate (431) and extends toward the rotor (3).

9. A scroll compressor, comprising a motor assembly and a housing (8), characterized in that, The motor assembly is the motor assembly of the compressor according to any one of claims 1 to 8. The top of the housing (8) is provided with a suction pipe (91) and the side wall of the housing (8) is provided with an exhaust pipe (92) so that the compressed gas is exhausted from top to bottom.

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