Balance block, motor rotor assembly and compressor
By optimizing the structural design of the balance block, extending the airflow guide section and reducing the tilt angle, the problem of high wind resistance of the balance block on the motor rotor was solved, achieving low noise, low power consumption and low oil discharge rate of the compressor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-20
AI Technical Summary
In existing technologies, the balance block generates significant wind resistance on the motor rotor, resulting in higher compressor operating noise and power consumption, as well as disrupting airflow and increasing oil discharge rate.
Design a balance block that extends circumferentially along the motor rotor and has a tapered airflow guide section. Set inclined guide surfaces at the windward and leeward ends, and optimize the position and angle of the connecting holes to extend the length of the airflow guide section and reduce the inclination angle.
It effectively reduces the wind resistance and pressure difference resistance of the balance block, reduces the turbulence of airflow, reduces the operating noise and power consumption of the compressor, and at the same time reduces the oil discharge rate, ensuring sufficient lubrication of the lubricating oil.
Smart Images
Figure CN224021560U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to compressor design technical field, concretely relates to a balance block, motor rotor subassembly and compressor. BACKGROUND
[0002] As shown in the formula (1), the windward surface and the leeward surface of the balance block in the prior art are mostly planar structures, when the compressor is working, the balance block rotates with the rotor, which will generate a relatively large wind resistance, at the same time, it will disturb the airflow inside the compressor, increase the oil discharge rate of the compressor, and generate additional noise. Figure 1
[0003] When the motor rotor rotates at high speed, the balance block arranged on one side generates centrifugal force to offset the unbalanced centrifugal force, the generated centrifugal force F (actually a centripetal force) is the most critical parameter for the design of the balance block, F = mrω2, wherein m is the mass of the balance block, r is the distance between the center of mass of the balance block and the center of the motor rotor, and ω is the angular velocity of the motor rotor when rotating. In the related art, in order to make F obtain a larger value, r should take a larger value, in order to achieve the foregoing purpose, the balance block in the prior art is arranged on one side of an axial section (i.e. a plane passing through the rotation axis of the motor rotor) of the motor rotor, and there is no solid part on the other side of the axial section, so as to avoid the mass of the solid part exceeding the mass, providing a force opposite to the direction of the foregoing F when the rotor rotates, thereby bringing negative effects. In addition, in the prior art, when the balance block is arranged on one side of the axial section and the mass meets the condition, it is arranged as far as possible from the axial section, so as to ensure that r takes a larger value, and a larger balance force can be achieved with less material.
[0004] As shown in the formula (1), the windward surface and the leeward surface of the balance block in the prior art are mostly planar structures, when the compressor is working, the balance block rotates with the rotor, which will generate a relatively large wind resistance, at the same time, it will disturb the airflow inside the compressor, increase the oil discharge rate of the compressor, and generate additional noise. Figure 2 As shown in the formula (1), the windward surface and the leeward surface of the balance block in the prior art are mostly planar structures, when the compressor is working, the balance block rotates with the rotor, which will generate a relatively large wind resistance, at the same time, it will disturb the airflow inside the compressor, increase the oil discharge rate of the compressor, and generate additional noise. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model provides a balance block, motor rotor subassembly and compressor, which can overcome the technical problems that the wind resistance of the balance block on the motor rotor is relatively large during rotation in the related art, and the compressor applied thereto has relatively high running noise and running power consumption.
[0006] To solve the above problems, the utility model provides a balance block, assemble in the first end surface of motor rotor, balance block includes balance block main part, balance block main part extends along the circumferential direction of motor rotor, balance block main part has the windward end and the leeward end, and balance block main part still has the proximal end face close to motor rotor and the distal end face away from motor rotor, the windward end and / or the leeward end has the airflow deflector along the circumferential direction of motor rotor, the airflow deflector is tapered structure along the circumferential direction away from balance block main part, motor rotor has the first axial section, balance block main part is at the first side of first axial section, the airflow deflector has the part at the second side of first axial section, and / or, the distal end face is provided with the connecting hole through the opposite two side end faces of balance block main part, in any radial plane of motor rotor projection, the central angle between the two connecting holes at the circumferential both ends of distal end face and the rotation axis of motor rotor is beta, 45 ° ≤ beta < 90 °.
[0007] In some embodiments, the windward end and the leeward end both have the airflow deflector extending along the circumferential direction of the motor rotor, and the free end of the two airflow deflectors and the rotation axis of the motor rotor form a central angle of alpha, 180° < alpha ≤ 270°.
[0008] In some embodiments, the airflow deflector has a first deflector surface, the first deflector surface intersects the distal end surface at a first intersection line, the first intersection line is a curve, and the first intersection line surrounds the connecting hole disposed close to the position corresponding thereto.
[0009] In some embodiments, the first deflector surface is an inclined plane or an inclined curved surface, and in the direction away from the first end surface, the inclined plane or the inclined curved surface is inclined from the side away from the balance block main body to the side close to the balance block main body.
[0010] In some embodiments, the airflow deflector further has a second deflector surface disposed opposite the first deflector surface, the second deflector surface is an inclined plane or an inclined curved surface, and in the direction close to the first end surface, the inclined plane or the inclined curved surface is inclined from the side away from the balance block main body to the side close to the balance block main body.
[0011] In some embodiments, the airflow guide portion has a guide radial outer side and a guide radial inner side, which smoothly approach the radial inner side of the motor rotor and / or the radial outer side of the motor rotor, respectively, when projected on any radial plane of the motor rotor.
[0012] In some embodiments, the first intersection line and the closest point of the free end tip of the airflow guide portion form a central angle of γ, the free end tip of the airflow guide portion, the closest point and the rotation axis of the motor rotor form a central angle of δ, and the hole diameter of the connecting hole is d, and the radius of the distribution circle of the connecting hole on the motor rotor is R.
[0013] .
[0014] In some embodiments, the balance block body is an annular extending along the circumference of the motor rotor, the inner annular surface radius of the balance block body is R 内 , the outer annular surface radius of the balance block body is R 外 , the free end tip of the airflow guide portion, the radial inner side end point of the first intersection line and the rotation axis of the motor rotor form a central angle of δ, and the angle between the angle bisector of γ and the first axis section is θ. ; and / or, the angle between the angle bisector of γ and the first axis section is θ.
[0015] The utility model also provides a motor rotor assembly, including motor rotor and the balance block of assembly in one end surface of motor rotor, balance block is above -mentioned balance block.
[0016] The utility model also provides a compressor, including motor rotor and the balance block of assembly in the end surface of motor rotor, balance block is above -mentioned balance block.
[0017] The balance block, motor rotor assembly and compressor provided by the utility model have the following beneficial effects:
[0018] Since the airflow guide portion has the part on the second side of the first axis section, that is, the airflow guide portion extends from the first side to the second side of the first axis section, the length of the airflow guide portion extending along the circumference of the motor rotor can be designed to be longer, and the longer airflow guide portion has a more gentle inclination angle, which can further reduce the wind resistance and pressure difference resistance of the balance block, thereby reducing the disturbance of the balance block operation to the airflow in the compressor, reducing the operation noise and operation power consumption of the compressor, and since the disturbance to the refrigerant airflow is reduced, the oil discharge rate of the compressor can also be limited and reduced.
[0019] By designing the first intersection line as a curve to form a surrounding close to the connecting hole corresponding to the position, the circumferential extension length of the airflow guide part can be increased as much as possible, the inclination angles of the windward end and the leeward end can be reduced, and the windward resistance and the leeward pressure difference resistance can be reduced while ensuring the installation size of the connecting bolt in the connecting hole and ensuring that the balance block is installed firmly.
[0020] By providing the first guide surface and the second guide surface on the opposite sides of the airflow guide part, the inclination angles of the guide surfaces can be further reduced, the wind resistance can be further reduced, and more importantly, after the balance block is assembled with the motor rotor, a suspended flow space is objectively formed between one side of the airflow guide part and the first end surface of the motor rotor, which can effectively reduce the pumping effect along the axial direction of the motor rotor during the rotation of the balance block, effectively prevent the disturbance to the internal flow field of the compressor due to the pumping effect, reduce the oil discharge rate and the oil discharge amount of the compressor exhaust refrigerant during the operation of the compressor, ensure the sufficient lubrication of the lubricating oil to the internal components of the compressor. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.
[0022] Figure 1 is a perspective view of a balance block in the related art;
[0023] Figure 2 is a perspective view of another balance block in the related art;
[0024] Figure 3 is a perspective view of a balance block in the first embodiment of the present application;
[0025] Figure 4 is a top view of Figure 3 ;
[0026] Figure 5 is a side view of Figure 3 ;
[0027] Figure 6 is a perspective view of a balance block in the second embodiment of the present application;
[0028] Figure 7 is a top view of Figure 6 ;
[0029] Figure 8 isFigure 6 The left view;
[0030] Figure 9 This is a top view of the balance block in the third embodiment of this utility model;
[0031] Figure 10 yes Figure 9 Another diagram showing the balance block;
[0032] Figure 11 This is a top view of the balance block in the fourth embodiment of this utility model.
[0033] The attached figures are labeled as follows:
[0034] 1. Balance block body; 11. Airflow guide section; 111. First guide surface; 112. Second guide surface; 12. Connecting hole; 100. First axial section. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0036] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.
[0037] For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "right", "left", "vertical", "horizontal", "top", "bottom", and the like, can be used herein for ease of description to describe one element's or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially 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 a device in the figures is inverted, 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° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. It will be understood that the spatially 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 a device in the figures is inverted, 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° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0038] In addition, it needs to be explained that the use of "first", "second" and the like words to limit the parts, only for the convenience of the corresponding parts for the distinction, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the scope of protection of the utility model.
[0039] For reference Figures 3 to 11 As shown in the drawings, according to the embodiment of the utility model, a balance block is assembled on the first end surface (not shown in the drawings, not marked) of motor rotor (not shown in the drawings, not marked), the balance block includes balance block main body 1, the balance block main body 1 extends along the circumferential direction (i.e. circumferential direction) of the motor rotor, the balance block main body 1 has windward end (not marked in the drawings) and leeward end (not marked in the drawings), and the balance block main body 1 also has the proximal end surface (not marked in the drawings, i.e. Figure 3 The lower end surface of the orientation) and the distal end surface (not marked in the drawings, i.e. Figure 3 The upper end surface of the orientation) away from the motor rotor), the windward end and / or the leeward end has airflow guide part 11 extending along the circumferential direction of the motor rotor, in a preferred embodiment, the aforementioned airflow guide part 11 is provided on the windward end and the leeward end, so that the balance block can be suitable for the working condition of bidirectional rotation of the motor rotor, the airflow guide part 11 is tapered structure along the circumferential direction away from the balance block main body 1, that is, the cross section of airflow guide part 11 is smaller and smaller along the direction away from the balance block main body 1, the motor rotor has first axial section 100 (its axial projection is shown in the drawings), the balance block main body 1 is at the first side of the first axial section 100 (such as Figure 3 The upper side of the first axial section 100 as shown), the airflow guide part 11 has the second side of the first axial section 100 (such as Figure 4 The lower side of the first axial section 100 as shown), the balance block main body 1 is provided with the airflow guide part 11 on the windward end and the leeward end, so that the balance block can be suitable for the working condition of bidirectional rotation of the motor rotor, the airflow guide part 11 is tapered structure along the circumferential direction away from the balance block main body 1, that is, the cross section of airflow guide part 11 is smaller and smaller along the direction away from the balance block main body 1, the motor rotor has first axial section 100 (its axial projection is shown in the drawings), the balance block main body 1 is at the first side of the first axial section 100 (such as Figure 4portion of the first axial section 100 (as shown in the lower side of the first axial section 100) Figure 4 the first embodiment shown.
[0040] In this technical solution, since the airflow guide portion 11 has a portion on the second side of the first axial section 100, that is, the airflow guide portion 11 extends from the first side to the second side of the first axial section 100, the length of the airflow guide portion 11 extending in the circumferential direction of the motor rotor can be designed to be longer, and the longer airflow guide portion 11 has a more gentle inclination angle, which can further reduce the wind resistance and pressure difference resistance of the balance block, thereby reducing the disturbance of the balance block operation to the airflow in the compressor, reducing the operating noise and operating power consumption of the compressor. In addition, since the disturbance to the refrigerant airflow is reduced, the oil discharge rate of the compressor can also be limited and reduced. It should be particularly noted that since the airflow guide portion 11 in the present application is a tapered structure, the mass of the portion on the second side of the first axial section 100 can be relatively small, thereby reducing the counteracting effect of the total balance of the balance block due to the mass of this portion.
[0041] Specifically referring to Figure 11 As shown, in another possible embodiment, a connecting hole 12 is arranged on the opposite two side surfaces of the balance block body 1, and projects on any radial plane of the motor rotor. The circumferential angle between the two connecting holes 12 at the two ends of the distal end surface and the center of the motor rotor is β, and 45°≤β<90°. At this time, the airflow guide portion 11 can be completely on the first side of the first axial section 100.
[0042] In this technical solution, by reducing the circumferential angle between the two connecting holes 12 at the two ends of the distal end surface, the length of the airflow guide portion 11 extending in the circumferential direction of the motor rotor can also be designed to be longer, thereby achieving the same technical effect as extending the airflow guide portion 11 to the second side of the first axial section 100.
[0043] In another preferred embodiment, the balance block has an airflow guide portion 11 having a portion on the second side of the first axial section 100, and the corresponding circumferential angle β of the two connecting holes 12 at the two ends of the distal end surface also satisfies 45°≤β<90°. In this way, the circumferential extension length of the airflow guide portion 11 can be further increased, the inclination angle can be further flattened, and the wind resistance can be further reduced.
[0044] Specifically referring to Figures 3 to 11As shown, as a preferred embodiment, the windward end and the leeward end both have the airflow guide part 11 extending along the circumference of the motor rotor, and the circumferential angle between the free end of the two airflow guide parts 11 and the rotation axis of the motor rotor is α, 180°<α≤270°, and the two airflow guide parts 11 are mirror-imaged about the balance block body 1. It should be noted that when α>270°, the windward end and the leeward end will exceed the horizontal line by 45°, and the entity part close to the lower edge has a large distance from the first axis section 100, which produces a large negative balance effect, and is not conducive to the design of the balance block.
[0045] In some embodiments, the airflow guide part 11 has a first guide surface 111 intersecting with the distal end surface at a first intersection line (not labeled in the figure), the first intersection line is a curve (in a specific embodiment, a circular arc), and the curve encloses the connecting hole 12 close to the position corresponding thereto.
[0046] In the technical solution, by designing the first intersection line as a curve to enclose the connecting hole 12 close to the position corresponding thereto, the installation surface size of the connecting bolt in the connecting hole 12 can be ensured, the balance block can be installed firmly, the circumferential extension length of the airflow guide part 11 can be increased as much as possible, the inclination angle of the windward end and the leeward end can be reduced, and the windward resistance and the leeward pressure difference resistance can be reduced.
[0047] In some embodiments, the first guide surface 111 is an inclined plane or an inclined curved surface (in a specific embodiment, an inclined circular arc surface), and in the direction away from the first end surface, the inclined plane or the inclined curved surface is inclined from the side away from the balance block body 1 to the side close to the balance block body 1.
[0048] In the technical solution, by designing the first guide surface 111 as an inclined plane or an inclined curved surface, the taper structure of the airflow guide part 11 is realized, and the structure design is simplified.
[0049] For details, see Figure 8As shown, in some embodiments, the airflow guide portion 11 further has a second guide surface 112 disposed opposite to the first guide surface 111. The second guide surface 112 is an inclined plane or an inclined curved surface, and in the direction close to the first end face, the inclined plane or inclined curved surface is inclined from the side away from the balance block body 1 to the side close to the balance block body 1. In a specific embodiment, the aforementioned first guide surface 111 and second guide surface 112 are symmetrical about the axial thickness plane of the balance block body 1. The aforementioned axial thickness plane is also the plane formed by points parallel to its near end face and equidistant from the near end face and the far end face in the axial direction.
[0050] In this technical solution, by setting a first guide surface 111 and a second guide surface 112 on opposite sides of the airflow guide section 11, the tilt angle of each guide surface can be further reduced, and the wind resistance can be further reduced. More importantly, after the balance block and the motor rotor are assembled, a suspended flow space is objectively formed between one side of the airflow guide section 11 and the first end face of the motor rotor. This can effectively reduce the pumping action along the axial direction of the motor rotor during the rotation of the balance block, effectively prevent the disturbance of the internal flow field of the compressor due to the pumping action, reduce the operating noise of the compressor, and reduce the oil discharge rate and oil discharge volume of the compressor exhaust refrigerant, ensuring that the lubricating oil fully lubricates the internal components of the compressor.
[0051] In some embodiments, the airflow guide 11 has a radially outer guide surface and a radially inner guide surface projected onto any radial surface of the motor rotor. The radially outer guide surface smoothly approaches the radially inner guide surface of the motor rotor and / or the radially inner guide surface smoothly approaches the radially outer guide surface of the motor rotor. This objectively makes the free end of the airflow guide 11 a small structure, which can further reduce the resistance of the refrigerant airflow during the rotation of the motor rotor and reduce the power consumption of the compressor.
[0052] In some embodiments, when projected onto any radial plane of the motor rotor, the point closest to the free end of the airflow guide 11 is designated as the first point. The central angle formed between the free end of the airflow guide 11, the first point, and the rotation axis of the motor rotor is γ. The diameter of the connecting hole 12 is d, and the radius of the distribution circle of each connecting hole 12 on the motor rotor is R. This ensures a sufficiently large screw installation distance between the aforementioned connecting hole 12 and the first point of the aforementioned first intersection line, and also ensures that the transition span angle is as large as possible, thereby reducing the tilt angle of the transition section and reducing wind resistance. In a specific embodiment, γ ≥ 45°. When γ ≥ 45°, the transition between the windward and leeward ends can be relatively gentle, reducing the tilt angle and thus lowering both wind resistance and leeward resistance.
[0053] In some embodiments, the balance block body 1 is an annular extending along the circumference of the motor rotor, the inner annular surface radius of the balance block body 1 is R 内 , and the outer annular surface radius of the balance block body 1 is R 外 , Thus, the intersection line (i.e., the first intersection line) between the airflow guide part 11 (i.e., the first airflow guide surface 111) and the distal end surface can be retracted backward, so as to increase the transition angle span of the inner side and the outer side windward end / backwind end; and / or, the angle bisector of γ and the first axial section 100 forms an included angle θ in the projection of the motor rotor in any radial plane, -10°≤θ≤30°, when the included angle is less than -10°, more weight is located in the negative effect area, which affects the effective centrifugal force of the balance weight, and when the included angle is greater than 30°, the transition area is too small, which is not conducive to reducing the inclination angle of the windward end and the backwind end. In some possible embodiments, θ=-2.38° or θ=3.63° or θ=11.48° or θ=15.19°. Referring to FIG. 1, when the angle bisector is on the upper side (i.e., the first side) of the first axial section 100, θ is positive, and when the angle bisector is on the lower side (i.e., the second side) of the first axial section 100, θ is negative. Figure 10
[0054] At least one connecting hole 12 is further arranged between the two connecting holes 12 at the circumferential ends of the distal end surface, so as to reduce the span between the two screws, so that the installation strength between the balance block and the rotor is affected, the number of installation holes is increased, and the connection strength between the balance block and the motor rotor can be enhanced.
[0055] According to the embodiments of the utility model, a motor rotor assembly is further provided, which comprises a motor rotor and a balance block assembled on one end surface of the motor rotor, and the balance block is the above-mentioned balance block.
[0056] According to the embodiments of the utility model, a compressor is further provided, which comprises a motor rotor and a balance block assembled on an end surface of the motor rotor, and the balance block is the above-mentioned balance block.
[0057] Those skilled in the art can easily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.
[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A balance block, characterized in that, Assembled on the first end face of the motor rotor, the balance block includes a balance block body (1) extending circumferentially along the motor rotor. The balance block body (1) has a windward end and a leeward end, and also has a proximal end face close to the motor rotor and a distal end face away from the motor rotor. The windward end and / or the leeward end have airflow guides (11) extending circumferentially along the motor rotor. The airflow guides (11) have a tapered structure circumferentially away from the balance block body (1). The motor rotor has a first axial section (100). The balance block body (1) is located on a first side of the first axial section (100). The airflow guides (11) have a portion located on a second side of the first axial section (100); and / or, The distal end face is provided with connecting holes (12) that pass through the opposite two end faces of the balance block body (1). When projected onto any radial plane of the motor rotor, the central angle formed between the two connecting holes (12) at the two circumferential ends of the distal end face and the rotation axis of the motor rotor is β, where 45°≤β<90°.
2. The balance block according to claim 1, characterized in that, Both the windward end and the leeward end have airflow guides (11) extending circumferentially along the motor rotor. When projected onto any radial plane of the motor rotor, the central angle formed between the free ends of the two airflow guides (11) and the rotation axis of the motor rotor is α, where 180°<α≤270°.
3. The balance block according to claim 2, characterized in that, The airflow guide (11) has a first guide surface (111), which intersects the distal end face at a first intersection line. The first intersection line is a curve and surrounds the connecting hole (12) located close to its position.
4. The balance block according to claim 3, characterized in that, The first guide surface (111) is an inclined plane or an inclined curved surface, and in the direction away from the first end face, the inclined plane or inclined curved surface is inclined from the side away from the balance block body (1) to the side close to the balance block body (1).
5. The balance block according to claim 4, characterized in that, The airflow guide section (11) also has a second guide surface (112) disposed opposite to the first guide surface (111). The second guide surface (112) is an inclined plane or an inclined curved surface, and in the direction close to the first end face, the inclined plane or inclined curved surface is inclined from the side away from the balance block body (1) to the side close to the balance block body (1).
6. The balance block according to claim 4 or 5, characterized in that, The airflow guide (11) has a guide radial outer side and a guide radial inner side, which are projected onto any radial surface of the motor rotor. The guide radial outer side smoothly approaches the radial inner side of the motor rotor and / or the guide radial inner side smoothly approaches the radial outer side of the motor rotor.
7. The balance block according to claim 3, characterized in that, Projected onto any radial plane of the motor rotor, the point closest to the free end of the airflow guide (11) is the first point. The central angle formed between the free end of the airflow guide (11), the first point, and the rotation axis of the motor rotor is γ. The diameter of the connecting hole (12) is d, and the radius of the distribution circle of each connecting hole (12) on the motor rotor is R. 。 8. The balance block according to claim 7, characterized in that, The balance block body (1) is an annular ring extending circumferentially along the motor rotor, and the inner annular radius of the balance block body (1) is R. 内 The outer radius of the balance block body (1) is R. 外 The central angle formed between the free end of the airflow guide (11), the radial inner end of the first intersection line, and the rotation axis of the motor rotor is δ. ; and / or, projected onto any radial plane of the motor rotor, the angle bisector of γ forms an angle θ with the first axial section (100), -10°≤θ≤30°.
9. A motor rotor assembly, comprising a motor rotor and a counterweight assembled on one end face of the motor rotor, characterized in that, The balance block is the balance block according to any one of claims 1 to 8.
10. A compressor comprising a motor rotor and a balance block assembled on an end face of the motor rotor, characterized in that, The balance block is the balance block according to any one of claims 1 to 8.