Rotor assembly and rotary compressor

Abstract

This invention provides a rotor assembly and a rotary compressor. The rotor assembly includes a motor rotor (3) and a first balance block (1). The motor rotor (3) includes a flow hole (7) extending axially through the motor rotor (3). The first balance block (1) is disposed on a first end face of the motor rotor (3). The flow hole (7) is located radially inside the first balance block (1). In the rotation direction of the motor rotor (3), the first balance block (1) has a windward end and a leeward end, with one end of the windward end and the leeward end being closer to the flow hole (7) than the other end, so that the first balance block (1) can promote fluid flow along the original flow direction of the fluid at the flow hole (7). According to the rotor assembly and rotary compressor of the present invention, the balance block can be used to promote the fluid flow rate in the rotor flow hole, thereby reducing the oil discharge rate of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a rotor assembly and a rotary compressor. Background Technology

[0002] In the related technology, the compressor has multiple flow holes penetrating the upper and lower ends of the rotor for the flow of refrigerant gas and cooling oil. During compressor operation, a large amount of cooling oil enters the upper cavity of the motor from various channels. The flow state of the oil and gas in the flow holes is uncertain and the flow rate is relatively small due to the influence of the balance blocks arranged above and below the rotor and the external flow field. The remaining flow is distributed to other channels of the motor, which obstructs the return flow of the cooling oil entering the upper cavity of the motor. A large amount of cooling oil accumulates in the upper cavity of the motor and is discharged from the compressor with the refrigerant, resulting in a high oil discharge rate. This leads to insufficient oil and lubrication in the compressor, which seriously affects the reliability of compressor operation. At the same time, excessive cooling oil entering the heat exchangers of the air conditioning system reduces the heat exchange performance of the air conditioning system. Furthermore, it enters the compression chamber with the suction gas, reducing the volume of the compression chamber and reducing the volumetric efficiency and energy efficiency of the compressor.

[0003] In existing compressor technologies, adding an oil baffle cap or plate above the rotor generally helps to align the flow direction of oil and gas within the rotor's flow holes, facilitating oil return from other motor channels. This method helps reduce the compressor's oil discharge rate, but it increases component costs and is more limited for small compressors. Other technologies use enclosures or partitions to weaken or eliminate the effects of relatively high and low pressure zones generated by the rotor's balance block rotation. In this method, the fluid flow direction within the rotor's flow holes is only affected by the external flow field, achieving similar flow consistency. However, without the facilitating effect of the balance block, the fluid flow rate decreases significantly, negatively impacting the reduction of the compressor's oil discharge rate. Summary of the Invention

[0004] The main objective of this invention is to provide a rotor assembly and a rotary compressor that can utilize a balance block to increase the fluid flow rate within the rotor flow orifice and reduce the oil discharge rate of the compressor.

[0005] To achieve the above objectives, according to one aspect of the present invention, a rotor assembly is provided, including a motor rotor and a first balance block. The motor rotor includes a flow hole extending axially through the motor rotor. The first balance block is disposed on a first end face of the motor rotor, and the flow hole is located radially inside the first balance block. In the rotation direction of the motor rotor, the first balance block has a windward end and a leeward end, with one end of the windward end and the leeward end being closer to the flow hole than the other end, so that the first balance block can facilitate fluid flow along the original flow direction of the fluid at the flow hole.

[0006] Furthermore, the axial projection of the first balance block on the end face of the motor rotor includes an inner line and an outer line, which, together with the outer circle of the motor rotor, form an asymmetrical structure.

[0007] Furthermore, in the same radial direction, the inner line is closer to the central axis of the motor rotor than the outer line.

[0008] Furthermore, the inner line near the end of the flow hole is tangent to the radial outer edge of the flow hole.

[0009] Furthermore, the figure enclosed by the inner and outer lines is an asymmetrical structure; or, the figure enclosed by the inner and outer lines is a symmetrical structure.

[0010] Furthermore, at the end near the flow hole, the inner line and the outer line are arc-shaped, and the curvature of the inner line is less than that of the outer line; and / or, at the end near the flow hole, the spacing between the inner line and the outer line increases along the direction from that end to the other end.

[0011] Furthermore, the inner line includes a single circular arc, a single straight line, a combination of circular arcs, a combination of straight lines, or a combination of circular arcs and straight lines; and / or, the outer line includes a single circular arc, a single straight line, a combination of circular arcs, a combination of straight lines, or a combination of circular arcs and straight lines.

[0012] Furthermore, the first balance block is positioned at the fluid outlet end of the flow hole, and the inner line of the windward end of the first balance block is closer to the flow hole than the inner line of the leeward end.

[0013] Furthermore, the inner line includes a first arc segment located at the windward end and a second arc segment located at the leeward end, and the outer line includes a third arc segment located at the windward end and a fourth arc segment located at the leeward end. The first and fourth arc segments are concentric with the outer circle of the motor rotor. One end of the second arc segment intersects with the fourth arc segment, and the other end is tangent to the first arc segment. One end of the third arc segment intersects with the first arc segment, and the other end is tangent to the fourth arc segment.

[0014] Furthermore, the first balance block is positioned at the fluid inflow end of the flow hole, and the inner line of the leeward end of the first balance block is closer to the flow hole than the inner line of the windward end.

[0015] Furthermore, the inner line includes a first arc segment located at the leeward end and a first straight line segment located at the windward end, and the outer line includes a third arc segment located at the leeward end and a fourth arc segment located at the windward end. The first arc segment and the fourth arc segment are concentric with the outer circle of the motor rotor. One end of the first straight line segment intersects with the fourth arc segment, and the other end is tangent to the first arc segment. One end of the third arc segment intersects with the first arc segment, and the other end is tangent to the fourth arc segment.

[0016] Furthermore, both the inner and outer lines are single arcs, with the two ends of the inner line intersecting the two ends of the outer line to form a crescent-shaped structure.

[0017] Furthermore, the rotor assembly also includes a second balance block, which is disposed on the second end face of the motor rotor. The axial projection of the second balance block on the end face of the motor rotor and the outer circle of the motor rotor form a symmetrical structure.

[0018] Furthermore, a base is provided at one end of the first balance block near the motor rotor, and the first balance block is fixedly mounted on the motor rotor by the base.

[0019] Furthermore, an axial projection is made on the end face of the motor rotor. The projected area of ​​the first balance block is A1, and the area enclosed by the outer circle of the motor rotor is A2, where A1≥1 / 8A2.

[0020] Furthermore, an axial projection is made on the end face of the motor rotor, with the center of the outer circle of the motor rotor as the center point, and the circumferential angle occupied by the projection of the first balance block is α, where 90°≤α≤270°.

[0021] According to another aspect of the present invention, a compressor is provided, including a rotor assembly, which is the rotor assembly described above.

[0022] The rotor assembly of this invention includes a motor rotor and a first balance block. The motor rotor includes a flow hole extending axially through the motor rotor. The first balance block is disposed on the first end face of the motor rotor, and the flow hole is located radially inside the first balance block. In the rotation direction of the motor rotor, the first balance block has a windward end and a leeward end, with one end of the windward end being closer to the flow hole than the other end, so that the first balance block can promote fluid flow along the original flow direction of the fluid at the flow hole. This rotor assembly optimizes the structure of the first balance block located at the end of the motor rotor, enabling the first balance block to adjust the position of the relatively high-pressure area and the relatively low-pressure area, thereby adjusting the flow direction of the fluid in the flow hole. The balance block increases the fluid flow rate in the flow hole that is in the same direction as the fluid that should be there, and suppresses the fluid flow rate in the flow hole that is in the opposite direction to the fluid that should be there, so that the fluid flow direction in the flow hole is consistent with the original required flow direction of the fluid in the flow hole, effectively reducing the oil discharge rate of the compressor. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0025] Figure 2 A structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0026] Figure 3 A structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0027] Figure 4 A structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0028] Figure 5 A perspective structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0029] Figure 6 A perspective structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0030] Figure 7 A perspective structural diagram of the first balancing block of a rotor assembly according to an embodiment of the present invention is shown; and

[0031] Figure 8 The flow rate growth curves of the rotor assembly of this embodiment of the invention relative to rotor assemblies of related technologies at different frequencies are shown.

[0032] The above figures include the following reference numerals:

[0033] 1. First balance block; 2. Second balance block; 101. Base; 102. Axial projection area of ​​balance block; 103. Outer line; 104. Inner line; 105. First arc segment; 106. Second arc segment; 107. Third arc segment; 108. Fourth arc segment; 109. First straight segment; 3. Motor rotor; 4. Outer circle; 5. Relative low-pressure area; 6. Relative high-pressure area; 7. Flow hole. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] See Figures 1 to 7As shown, according to an embodiment of the present invention, the rotor assembly includes a motor rotor 3 and a first balance block 1. The motor rotor 3 includes a flow hole 7 extending axially through the motor rotor 3. The first balance block 1 is disposed on a first end face of the motor rotor 3. The flow hole 7 is located radially inside the first balance block 1. In the rotation direction of the motor rotor 3, the first balance block 1 has a windward end and a leeward end. One end of the windward end and the leeward end is closer to the flow hole 7 than the other end, so that the first balance block 1 can facilitate the flow of fluid along the original flow direction of the fluid at the flow hole 7. Here, the original flow direction of the fluid refers to the flow direction that the fluid should have at the flow hole 7 without the balance block.

[0036] The rotor assembly optimizes the structure of the first balance block 1 located at the end of the motor rotor 3, thereby adjusting the position of the relatively high pressure zone and the relatively low pressure zone of the first balance block 1, adjusting the flow direction of the fluid in the flow hole 7, using the balance block to increase the fluid flow rate in the flow hole 7 that is in the same direction as the fluid that should originally have, and suppressing the fluid flow rate in the flow hole 7 that is in the opposite direction to the fluid that should originally have, so that the fluid flow direction in the flow hole 7 is consistent with the original fluid flow direction required in the flow hole 7, effectively reducing the oil discharge rate of the compressor.

[0037] In addition, by improving the structure of the first balance block 1, the refrigerant flow rate through the flow hole 7 is increased, which is beneficial for motor heat dissipation.

[0038] The above solution can reduce the oil discharge rate by increasing the oil and gas flow rate through the flow hole 7, thereby increasing the internal circulation volume of the compressor, without changing the cost or materials.

[0039] In one embodiment, there are multiple flow holes 7, which are evenly arranged along the circumference of the motor rotor 3.

[0040] In one embodiment, the axial projection of the first balance block 1 on the end face of the motor rotor 3 includes an inner line 104 and an outer line 103, which, together with the outer circle line 4 of the motor rotor 3, form an asymmetrical structure. In this embodiment, since the inner line 104 and the outer line 103, together with the outer circle line 4 of the motor rotor 3, form an asymmetrical structure, the regions of the relatively high-pressure area and the relatively low-pressure area formed by the first balance block 1 can be changed. This increases the area that is conducive to fluid flow along its original flow direction and decreases the area that is unfavorable to fluid flow along its original flow direction. Thus, the first balance block 1 promotes fluid flow along its original flow direction within the flow holes 7, improves the consistency of fluid flow direction within each flow hole 7, increases the oil and gas flow rate within the flow holes 7, and reduces the oil discharge rate of the compressor.

[0041] The flow holes 7 are all located inside the inner side line 104, which can more effectively avoid the outer side line from affecting the flow of fluid in the flow holes 7, and facilitate the optimization of the structure of the first balance block 1, thereby increasing the oil and gas flow rate in the flow holes 7.

[0042] In one embodiment, in the same radial direction, the inner line 104 is closer to the central axis of the motor rotor 3 than the outer line 103. In this embodiment, since the inner line 104 is closer to the central axis of the motor rotor 3 than the outer line 103, the problem of the first balance block 1 being biased to one side, resulting in poor balancing force effect and poor flow guiding effect, can be avoided.

[0043] In one embodiment, the inner line 104 near one end of the flow hole 7 is tangent to the radial outer edge of the flow hole 7. In this embodiment, the inner line 104 near the flow hole 7 is located outside the flow hole 7 and is tangent to a portion of the flow hole 7. This reduces the inner region near the flow hole 7, thereby reducing the adverse effect of this region on the fluid flow within the flow hole 7. At the same time, it increases the inner region away from the flow hole 7, thereby enhancing the promoting effect of this region on the fluid flow within the flow hole 7.

[0044] See also Figure 1 and Figure 3 As shown, in one embodiment, the pattern enclosed by the inner line 104 and the outer line 103 is an asymmetrical structure. In this embodiment, the axial projection area 102 of the first balance block 1 enclosed by the inner line 104 and the outer line 103 is an asymmetrical structure, and the structure formed by combining it with the outer circle line 4 is also an asymmetrical structure, which can effectively enhance the fluid flowability in the flow hole 7 and reduce the oil discharge rate.

[0045] See also Figure 2 and Figure 4 As shown, in one embodiment, the pattern enclosed by the inner line 104 and the outer line 103 is a symmetrical structure. In this embodiment, the axial projection area 102 of the first balance block 1 enclosed by the inner line 104 and the outer line 103 is a symmetrical structure, and the structure formed after combining with the outer circle line 4 is an asymmetrical structure, which can also effectively enhance the fluid flowability in the flow hole 7 and reduce the oil discharge rate.

[0046] In one embodiment, at the end near the flow hole 7, the inner line 104 and the outer line 103 are arc-shaped, and the curvature of the inner line 104 is less than that of the outer line 103. In this embodiment, the curvature of the inner line 104 is less than that of the outer line 103, which allows the outer line 103 to be more curved. This enhances the flow-diverting effect of the first balance block 1 on the fluid at the end near the flow hole 7, so that areas where the fluid is not conducive to flowing in the flow hole 7 along its original flow direction are isolated to the outside by the first balance block 1, and will not affect the fluid flow in the flow hole 7, thereby reducing the adverse effect of the first balance block 1 on the fluid flow in the flow hole 7.

[0047] In one embodiment, near one end of the flow hole 7, the spacing between the inner line 104 and the outer line 103 increases along the direction from that end to the other. In this embodiment, this structure also facilitates the separation of areas that are detrimental to the flow of fluid within the flow hole 7 along its intended flow direction, reducing the adverse effects of the first balancing block 1 on the flow of fluid within the flow hole 7.

[0048] In one embodiment, the inner line 104 includes a single arc, a single straight line, a combination of arcs, a combination of straight lines, or a combination of arcs and straight lines.

[0049] In one embodiment, the outer line 103 includes a single arc, a single straight line, a combination of arcs, a combination of straight lines, or a combination of arcs and straight lines.

[0050] In one embodiment, the first balance block 1 is disposed at the fluid outlet end of the flow hole 7, and the inner line 104 of the windward end of the first balance block 1 is closer to the flow hole 7 than the inner line 104 of the leeward end.

[0051] In this embodiment, when the first balance block 1 is set at the fluid outlet end of the flow hole 7, the setting of the first balance block 1 needs to be more conducive to the fluid flowing from the inlet end to the outlet end. Therefore, at this time, the inner line 104 of the windward end of the first balance block 1 needs to be closer to the flow hole 7 than the inner line 104 of the leeward end. In this way, the area of ​​the relatively high pressure zone 6 on the side where the inner line 104 is located on the windward end can be reduced, so that the high pressure zone is more separated on the outside of the outer line 103 on the windward end and further away from the flow hole 7, without compressing the fluid flow in the flow hole 7 on the side where the inner line 104 is located. This allows the fluid in the flow hole 7 in this area to flow smoothly from the inlet end to the outlet end, thereby increasing the fluid flow rate in this area. As for the relatively low-pressure area 5 located at the leeward end, since the inner line 104 of the leeward end is far away from the flow hole 7, it is more conducive to forming a larger relatively low-pressure area 5 on the side where the inner line 104 of the leeward end is located. This can reduce the outlet pressure of the flow hole 7 in this area, making it easier for the fluid to flow from the inflow end to the outflow end.

[0052] In this embodiment, by optimizing the structure of the first balance block 1, the area of ​​the relatively high pressure zone 6 that adversely affects the fluid flow in the flow hole 7 is greatly reduced or even eliminated, while the area of ​​the relatively low pressure zone 5 that is beneficial to the fluid flow in the flow hole 7 is increased. This allows the flow hole 7 to be subjected only to the suction force provided by the relatively low pressure zone 5, and this suction force is not weakened by external forces. As a result, the oil and gas flow rate of the flow hole 7 can be effectively increased, and the oil discharge rate of the compressor can be reduced.

[0053] In one embodiment, the inner line 104 includes a first arc segment 105 located at the windward end and a second arc segment 106 located at the leeward end, and the outer line 103 includes a third arc segment 107 located at the windward end and a fourth arc segment 108 located at the leeward end. The first arc segment 105 and the fourth arc segment 108 are concentric with the outer circle of the motor rotor 3. One end of the second arc segment 106 intersects with the fourth arc segment 108, and the other end is tangent to the first arc segment 105. One end of the third arc segment 107 intersects with the first arc segment 105, and the other end is tangent to the fourth arc segment 108.

[0054] This structure allows the airflow to flow more smoothly inside and outside the first balance block 1, making it easier to adjust the area of ​​the relatively high-pressure zone and the relatively low-pressure zone. This makes the first balance block 1 more conducive to promoting fluid flow within the flow hole 7, improving fluid flow efficiency, and reducing the compressor's oil discharge rate.

[0055] See also Figure 2As shown, in one embodiment, the axial projection of the first balance block 1 is symmetrical and offset relative to the motor rotor 3, making the overall structure formed by the first balance block 1 and the motor rotor 3 asymmetrical. In this embodiment, the outer line 103 includes two intersecting arcs, and the inner line 104 includes a combination of arcs and straight lines. In this embodiment, only the suction effect of the leeward end relative to the low-pressure area is utilized, thus increasing the oil and gas flow rate in the rotor flow hole.

[0056] In one embodiment, the first balance block 1 is disposed at the fluid inflow end of the flow hole 7, and the inner line 104 of the leeward end of the first balance block 1 is closer to the flow hole 7 than the inner line 104 of the windward end.

[0057] In this embodiment, when the first balance block 1 is set at the fluid inflow end of the flow hole 7, the setting of the first balance block 1 needs to be more conducive to the fluid flowing from the inflow end to the outflow end. Therefore, at this time, it is necessary to make the inner line 104 of the leeward end of the first balance block 1 closer to the flow hole 7 than the inner line 104 of the windward end. In this way, the area of ​​the relatively high pressure zone 6 on the side where the inner line 104 is located on the windward end can be increased, so that the high pressure zone is formed more on the inner side of the inner line 104 on the windward end, increasing the area of ​​the relatively high pressure zone on the inner side of the inner line 104 on the windward end, and compressing the fluid flow in the flow hole 7 on the side where the inner line 104 is located, so that the fluid in the flow hole 7 in this area can be squeezed to flow from the inflow end to the outflow end, thereby increasing the fluid flow rate in this area. As for the relatively low-pressure area 5 located on the leeward side, since the inner line 104 of the leeward side is close to the flow hole 7, it is more conducive to forming a smaller relatively low-pressure area 5 on the side where the inner line 104 of the leeward side is located, or even eliminating the relatively low-pressure area 5. This can prevent the fluid from flowing back at the outlet end of the flow hole 7 due to the low pressure in this area, making it easier for the fluid to flow from the inlet end to the outlet end.

[0058] In this embodiment, by optimizing the structure of the first balance block 1, the area of ​​the relatively low-pressure zone 5, which adversely affects the fluid flow in the flow hole 7, is significantly reduced or even eliminated, while the area of ​​the relatively high-pressure zone 6, which is beneficial to the fluid flow in the flow hole 7, is increased. This allows the flow hole 7 to be subjected only to the pressure provided by the relatively high-pressure zone 6. Since the area of ​​the relatively low-pressure zone 5 is small, it can even be ignored, so it will not weaken the squeezing effect of the relatively high-pressure zone 6. This effectively increases the oil and gas flow rate of the flow hole 7 and reduces the oil discharge rate of the compressor.

[0059] See also Figure 3As shown, in one embodiment, the inner line 104 includes a first arc segment 105 located at the leeward end and a first straight line segment 109 located at the windward end, and the outer line 103 includes a third arc segment 107 located at the leeward end and a fourth arc segment 108 located at the windward end. The first arc segment 105 and the fourth arc segment 108 are concentric with the outer circle of the motor rotor 3. One end of the first straight line segment 109 intersects with the fourth arc segment 108, and the other end is tangent to the first arc segment 105. One end of the third arc segment 107 intersects with the first arc segment 105, and the other end is tangent to the fourth arc segment 108.

[0060] See also Figure 4 As shown, in one embodiment, both the inner line 104 and the outer line 103 are single arcs, and the two ends of the inner line 104 intersect with the two ends of the outer line 103 to form a crescent-shaped structure. In this embodiment, the crescent-shaped structure formed by the first balance block 1 is symmetrical and is offset on the end face of the motor rotor 3, so that the overall structure formed by the first balance block 1 and the motor rotor 3 is not an asymmetrical structure. Thus, this asymmetrical structure can also be used to reduce or even eliminate unfavorable pressure areas, increase favorable pressure areas, and increase the flow rate of fluid in the flow hole 7.

[0061] In this embodiment, since the area of ​​the relatively high pressure zone 6 is larger, the squeezing effect is better, and more flow holes 7 are subjected to the squeezing effect of the relatively high pressure zone, thereby squeezing the oil and gas in the flow holes 7 to the other side of the flow holes 7.

[0062] In one embodiment, the rotor assembly further includes a second balance block 2, which is disposed on the second end face of the motor rotor 3. The axial projection of the second balance block 2 on the end face of the motor rotor 3 and the outer circle of the motor rotor 3 form a symmetrical structure.

[0063] The second balance block 2 can cooperate with each of the aforementioned first balance blocks 1, thereby achieving a more effective balance adjustment while further enhancing the effect of the balance block on promoting fluid flow.

[0064] After adopting the scheme of combining the first balance block 1 and the second balance block 2, it is possible to make the oil and gas inside more than 80% of the flow holes 7, or even all of the flow holes 7, flow in the same direction.

[0065] See also Figure 8 As shown, after adopting the solution of this application embodiment, the oil and gas flow rate through the flow hole is significantly increased, reaching more than 40%, and the higher the frequency, the greater the increase.

[0066] In one embodiment, a base 101 is provided at one end of the first balance block 1 near the motor rotor 3, and the first balance block 1 is fixedly mounted on the motor rotor 3 via the base 101.

[0067] In this embodiment, the first balance block 1 and the base 101 can be integrally formed, or they can be formed separately and then fixedly connected together.

[0068] In one embodiment, the base 101 is annular.

[0069] In some embodiments, to facilitate the assembly and positioning process, the base 101 can be designed as a multi-prism form such as a triangular prism or a quadrangular prism.

[0070] In one embodiment, an axial projection is made on the end face of the motor rotor 3, the projected area of ​​the first balance block 1 is A1, and the area enclosed by the outer circle of the motor rotor 3 is A2, A1≥1 / 8A2, thereby ensuring that the first balance block 1 has sufficient volume, which can play an effective balancing role and an effective fluid flow promotion role.

[0071] In one embodiment, an axial projection is made on the end face of the motor rotor 3, with the center of the outer circle of the motor rotor 3 as the center point. The circumferential angle occupied by the projection of the first balance block 1 is α, where 90°≤α≤270°. When the circumferential angle occupied by the first balance block 1 exceeds 270°, the center of gravity of the first balance block 1 shifts significantly inward toward the rotation center line of the motor rotor 3, and may even lose its balancing torque effect; when the circumferential angle occupied by the first balance block 1 is less than 90°, the weight of the first balance block 1 will be too light, resulting in insufficient torque.

[0072] According to an embodiment of the present invention, the compressor includes a rotor assembly, which is the rotor assembly described above.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that, The device includes a motor rotor (3) and a first balance block (1). The motor rotor (3) includes a flow hole (7) extending axially through the motor rotor (3). The first balance block (1) is disposed on a first end face of the motor rotor (3). The flow hole (7) is located radially inside the first balance block (1). In the rotation direction of the motor rotor (3), the first balance block (1) has a windward end and a leeward end. One end of the windward end and the leeward end is closer to the flow hole (7) than the other end, so that the first balance block (1) can promote fluid flow along the original flow direction of the fluid at the flow hole (7).

2. The rotor assembly according to claim 1, characterized in that, The axial projection of the first balance block (1) on the end face of the motor rotor (3) includes an inner line (104) and an outer line (103). The inner line (104) and the outer line (103) together with the outer circle line (4) of the motor rotor (3) form an asymmetrical structure.

3. The rotor assembly according to claim 2, characterized in that, In the same radial direction, the inner line (104) is closer to the central axis of the motor rotor (3) than the outer line (103).

4. The rotor assembly according to claim 2, characterized in that, The inner line (104) near one end of the flow hole (7) is tangent to the radial outer edge of the flow hole (7).

5. The rotor assembly according to claim 2, characterized in that, The figure enclosed by the inner line (104) and the outer line (103) is an asymmetrical structure; or, the figure enclosed by the inner line (104) and the outer line (103) is a symmetrical structure.

6. The rotor assembly according to claim 2, characterized in that, At one end near the flow hole (7), the inner line (104) and the outer line (103) are arc-shaped, and the curvature of the inner line (104) is less than the curvature of the outer line (103); and / or, at one end near the flow hole (7), the spacing between the inner line (104) and the outer line (103) increases along the direction from that end to the other end.

7. The rotor assembly according to claim 2, characterized in that, The inner line (104) includes a single arc, a single straight line, a combination of arcs, a combination of straight lines, or a combination of arcs and straight lines; and / or, the outer line (103) includes a single arc, a single straight line, a combination of arcs, a combination of straight lines, or a combination of arcs and straight lines.

8. The rotor assembly according to claim 2, characterized in that, The first balance block (1) is disposed at the fluid outlet end of the flow hole (7), and the inner line (104) of the windward end of the first balance block (1) is closer to the flow hole (7) than the inner line (104) of the leeward end.

9. The rotor assembly according to claim 8, characterized in that, The inner line (104) includes a first arc segment (105) located at the windward end and a second arc segment (106) located at the leeward end. The outer line (103) includes a third arc segment (107) located at the windward end and a fourth arc segment (108) located at the leeward end. The first arc segment (105) and the fourth arc segment (108) are concentric with the outer circle of the motor rotor (3). One end of the second arc segment (106) intersects with the fourth arc segment (108) and the other end is tangent to the first arc segment (105). One end of the third arc segment (107) intersects with the first arc segment (105) and the other end is tangent to the fourth arc segment (108).

10. The rotor assembly according to claim 2, characterized in that, The first balance block (1) is disposed at the fluid inflow end of the flow hole (7), and the inner line (104) of the leeward end of the first balance block (1) is closer to the flow hole (7) than the inner line (104) of the windward end.

11. The rotor assembly according to claim 10, characterized in that, The inner line (104) includes a first arc segment (105) located at the leeward end and a first straight line segment (109) located at the windward end. The outer line (103) includes a third arc segment (107) located at the leeward end and a fourth arc segment (108) located at the windward end. The first arc segment (105) and the fourth arc segment (108) are concentric with the outer circle of the motor rotor (3). One end of the first straight line segment (109) intersects with the fourth arc segment (108) and the other end is tangent to the first arc segment (105). One end of the third arc segment (107) intersects with the first arc segment (105) and the other end is tangent to the fourth arc segment (108).

12. The rotor assembly according to claim 10, characterized in that, Both the inner line (104) and the outer line (103) are single arcs. The two ends of the inner line (104) intersect with the two ends of the outer line (103) to form a crescent-shaped structure.

13. The rotor assembly according to claim 1, characterized in that, The rotor assembly further includes a second balance block (2), which is disposed on the second end face of the motor rotor (3). The axial projection of the second balance block (2) on the end face of the motor rotor (3) forms a symmetrical structure with the outer circle of the motor rotor (3).

14. The rotor assembly according to claim 1, characterized in that, The first balance block (1) is provided with a base (101) at one end near the motor rotor (3), and the first balance block (1) is fixedly mounted on the motor rotor (3) through the base (101).

15. The rotor assembly according to any one of claims 1 to 14, characterized in that, An axial projection is made on the end face of the motor rotor (3), the projected area of ​​the first balance block (1) is A1, and the area enclosed by the outer circle of the motor rotor (3) is A2, where A1≥1 / 8A2.

16. The rotor assembly according to any one of claims 1 to 14, characterized in that, An axial projection is made on the end face of the motor rotor (3), with the center of the outer circle of the motor rotor (3) as the center point, and the circumferential angle occupied by the projection of the first balance block (1) is a, 90°≤a≤270°.

17. A compressor comprising a rotor assembly, characterized in that, The rotor assembly is the rotor assembly according to any one of claims 1 to 16.

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