Balance block, motor rotor assembly and compressor
By designing a balance block with suspended fluid in the compressor, the refrigerant pump transfer problem caused by the large windward area of the balance block is solved, which significantly reduces the noise and oil discharging rate and ensures the lubricating condition inside the compressor.
Patent Information
- Application Number
- CN202510401210.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2025-06-06
AI Technical Summary
In existing compressors, the windward area of the balance block is large, which causes the refrigerant to be transported to the outside and upper sides by the pump during operation, disrupting the internal flow field of the compressor, increasing noise, and aggravating the oil discharge rate and oil discharge amount, resulting in insufficient lubrication.
A balance block is designed to be assembled on the first end face of the motor rotor. The balance block body extends along the circumference of the motor rotor. There is a suspended fluid guide on the windward end to form a suspended overcurrent space. The radial outer side and inner side faces are close to each other to reduce the cross-sectional area.
By reducing the windward area of the balance block and pumping effect, the refrigerant airflow resistance and noise are reduced, the oil discharge rate and oil discharge amount are ensured to sufficient lubrication inside the compressor.
Smart Images
Figure CN120110079A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of compressor design, and in particular relates to a balancing block, a motor rotor assembly and a compressor. Background Art
[0002] In the prior art, the balance block in the compressor has a relatively large windward surface area, so when the compressor is in operation, the balance block rotates with the motor rotor to form a fan effect, and the refrigerant is driven to flow radially outward and axially upward. This disrupts the internal flow field of the compressor, causing the compressor noise phenomenon (produced by the collision of the refrigerant airflow with the compressor casing and the motor stator, etc.) to be aggravated. At the same time, the oil discharge rate and oil discharge volume of the compressor exhaust refrigerant are also aggravated under the pumping action of the balance block, which poses a risk of insufficient lubrication in the compressor. Summary of the invention
[0003] Therefore, the present invention provides a balancing block, a motor rotor assembly and a compressor, which can overcome the technical problem in the related art that the balancing block on the motor rotor forms a fan effect on the refrigerant in the compressor during the operation of the compressor, causing the refrigerant to produce an outward and upward pumping flow, disrupting the internal flow field of the compressor, causing the compressor noise phenomenon to increase, and increasing the oil discharge rate and oil discharge volume of the compressor exhaust refrigerant, resulting in the risk of insufficient lubrication in the compressor.
[0004] In order to solve the above problems, the present invention provides a balancing block, which is assembled on a first end face of a motor rotor, the balancing block comprising a balancing block main body, the balancing block main body extending along the circumference of the motor rotor, the balancing block main body having a windward end and a leeward end, at least the windward end having a suspended flow guide extending along the circumference of the motor rotor, a suspended flow-through space being formed between a side of the suspended flow guide close to the first end face and the first end face, the suspended flow guide having a flow guide radial outer side face and a flow guide radial inner side face, which are projected on the radial face of the motor rotor, the flow guide radial outer side face gradually approaches the radial inner side of the motor rotor and / or the flow guide radial inner side face gradually approaches the radial outer side of the motor rotor so that the cross-section of the suspended flow guide becomes smaller and smaller along the circumference away from the balancing block main body.
[0005] In some embodiments, the suspended body guide is integrally formed with the balancing weight body.
[0006] In some embodiments, the minimum area of each cross section of the suspended body conductor is S min , 0.5mm 2 ≤S min ≤9mm 2To form a positioning surface, and / or, the radial thickness of the balancing weight body is B, the axial thickness is H, the radial span of the positioning surface is b, the axial span is h, b≤B / 2, h≤H / 2.
[0007] In some embodiments, the balancing weight body is in the shape of a ring, and the cross-sectional area of the balancing weight body is S, S min ≤S / 4.
[0008] In some embodiments, the guide radial outer side surface and the guide radial inner side surface are curved surfaces or inclined surfaces.
[0009] In some embodiments, the balancing weight body has an equal thickness plane passing through the midpoint of its axial thickness, and the equal thickness plane is arranged parallel to the first end face and spaced apart, and the suspended body guide is symmetrical about the equal thickness plane; or, the suspended body guide is a frustum.
[0010] In some embodiments, the suspended flow space is formed by a smooth curved surface inclined toward the equal thickness plane.
[0011] In some embodiments, the frustum shape is a circular frustum shape; or, the frustum shape is a quadrangular frustum shape, and the edges of the quadrangular frustum shape are smoothly connected via rounded corners.
[0012] The present invention further provides a motor rotor assembly, comprising a motor rotor and a balancing block assembled on an end surface of the motor rotor, wherein the balancing block is the above-mentioned balancing block.
[0013] The present invention also provides a compressor, comprising a motor rotor and a balancing block assembled on the end surface of the motor rotor facing the exhaust pipe of the compressor, wherein the balancing block is the above-mentioned balancing block.
[0014] A balancing block, a motor rotor assembly and a compressor provided by the present invention have the following beneficial effects:
[0015] The suspended flow space formed between the first end face of the suspended guide body on the windward end and / or the leeward end of the balancing block body close to the motor rotor can reduce the windward area of the balancing block during rotation, thereby significantly reducing the refrigerant airflow resistance. The suspended setting can effectively reduce the axial pumping effect of the balancing block along the motor rotor during rotation. The design of the radial outer side surface and / or the radial inner side surface of the suspended guide body being close to each other makes the cross-section of the suspended guide body smaller and smaller along the circumferential direction away from the balancing block body, further reducing the refrigerant airflow resistance while significantly reducing the radial width of the suspended guide body. This can reduce the radial outward pumping effect of the motor rotor during rotation of the balancing block, thereby effectively preventing the disturbance of the internal flow field of the compressor due to the pumping effect, reducing the operating noise of the compressor, and reducing the oil discharge rate and oil discharge amount of the compressor exhaust refrigerant, ensuring that the lubricating oil fully lubricates the internal components of the compressor.
[0016] By adding S min Designed to be within 0.5mm 2 With 9mm 2 A positioning surface with a reasonable area and load-bearing capacity can be provided. At the same time, since the positioning surface is located on the suspended body guide and forms the aforementioned suspended flow-through space with the first end face of the motor rotor, a smaller cross-sectional area can be used to realize the circumferential positioning of the motor rotor through the balancing block during the magnetization process or the assembly process;
[0017] When b≤B / 2, the eddy current phenomenon generated by the refrigerant flowing inward and outward in the radial direction of the motor rotor and the smooth approach between the positioning surface and the radial inner side and / or the connection position of the guide radial inner side surface can be significantly reduced, thereby further reducing the operating noise of the compressor;
[0018] The suspended body guide is designed to form a symmetrical structure about an equal-thickness plane passing through the midpoint of the axial thickness of the balancing block body. The reverse characteristics of the suspended body guide, which are symmetrical in direction, can be used to eliminate the axial pumping effect to the greatest extent, while also reducing to a certain extent the axial force applied to the motor shaft during the rotation of the balancing block. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the balancing weight in the first embodiment of the present invention;
[0021] Figure 2 yes Figure 1 A front view of
[0022] Figure 3 yes Figure 1 A top view of
[0023] Figure 4 is a schematic diagram of the three-dimensional structure of a balancing weight according to a second embodiment of the present invention;
[0024] Figure 5 is a schematic diagram of the three-dimensional structure of a balancing weight according to a third embodiment of the present invention;
[0025] Figure 6 yes Figure 5 A top view of
[0026] Figure 7 is a schematic diagram of the three-dimensional structure of a balancing weight according to a fourth embodiment of the present invention;
[0027] Figure 8 yes Figure 7 A top view of
[0028] Fig. 9 is a schematic diagram of the three-dimensional structure of a balancing weight according to a fifth embodiment of the present invention;
[0029] Fig.10 yes Fig. 9 A top view of
[0030] Fig.11 is a schematic diagram of the three-dimensional structure of a balancing weight according to a fifth embodiment of the present invention;
[0031] Fig.12 yes Fig.11 Side view of
[0032] Fig.13 It is a schematic diagram of the three-dimensional structure of a balancing block in the related art.
[0033] The accompanying drawings are marked as follows:
[0034] 1. Balance block body; 11. Suspended flow guide; 12. Connection hole; 100. Suspended flow space. DETAILED DESCRIPTION
[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0036] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0037] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.
[0039] See also Figures 1 to 12As shown, according to an embodiment of the present invention, there is provided a balancing block, which is assembled on a first end face (not shown in the figure) of a motor rotor (not shown in the figure), the first end face being the end face of the motor rotor on a side close to the compressor exhaust port (not shown in the figure), the balancing block comprising a balancing block body 1, the balancing block body 1 being assembled on the first end face, the balancing block body 1 extending along the circumference of the motor rotor, the balancing block body 1 having a windward end (not labeled in the figure) and a leeward end (not labeled in the figure), at least the windward end having a suspended body guide 11 extending along the circumference of the motor rotor, in a preferred embodiment, both the windward end and the leeward end having the suspended body guide 11, the side of the suspended body guide 11 close to the first end face and the first end face A suspended flow-through space 100 is formed between the suspended body 1 and the suspended body 11. The suspended body 11 has a radially outer side surface (not labeled in the figure) and a radially inner side surface (not labeled in the figure). When projected on the radial surface of the motor rotor (i.e., any plane perpendicular to the rotation axis of the motor rotor), the radially outer side surface of the body 1 gradually approaches (preferably smoothly) to the radially inner side of the motor rotor and / or the radially inner side surface of the body 1 gradually approaches (preferably smoothly) to the radially outer side of the motor rotor so that the cross section of the suspended body 11 becomes smaller and smaller along the circumferential direction away from the balancing block body 1. The aforementioned cross section refers to the cross section obtained by the intersection of each radial surface (i.e., the axial cross section of the motor rotor) passing through the rotation axis of the motor rotor and the suspended body 11 in sequence along the circumferential direction of the motor rotor. The aforementioned balancing block body 1 is formed with connection holes 12 that pass through the opposite sides thereof, and the reliable assembly connection between the balancing block and the motor rotor is achieved through the connection holes 12.
[0040] In this technical solution, a suspended flow space 100 is formed between the first end surface of the suspended flow guide 11 on the windward end and / or the leeward end of the balance block main body 1 close to the motor rotor, which can reduce the windward area of the balance block during rotation, thereby significantly reducing the refrigerant airflow resistance. The suspended setting can effectively reduce the axial pumping effect of the motor rotor during the rotation of the balance block, and the radial outer side surface and / or the radial inner side surface of the suspended flow guide 11 are close to each other, so that the cross-section of the suspended flow guide 11 becomes smaller and smaller along the circumferential direction away from the balance block main body 1, further guiding and reducing the refrigerant airflow resistance, and can also significantly reduce the radial width of the suspended flow guide 11. This can reduce the radial outward pumping effect of the motor rotor during the rotation of the balance block, thereby effectively preventing the disturbance of the internal flow field of the compressor due to the pumping effect, reducing the operating noise of the compressor, and reducing the oil discharge rate and oil discharge amount of the compressor exhaust refrigerant, ensuring sufficient lubrication of the internal components of the compressor by the lubricating oil.
[0041] In some embodiments, the suspended body guide 11 is integrally formed with the balancing weight body 1 , and the aforementioned integral forming is specifically achieved by, for example, machining, milling after injection molding, and the like.
[0042] In this technical solution, the balancing weight body 1 and the suspended body guide 11 are formed into an organic whole by an integrated molding method, which can simplify the manufacturing process of the balancing weight and the assembly process.
[0043] In some embodiments, the minimum area of each cross section of the suspended body guide 11 is S min , in a Fig. 9 In the embodiment described, S min can approach zero. At this time, the suspended guide body 11 with a smaller head has a better effect of guiding and reducing wind resistance. In a more preferred embodiment, 0.5 mm 2 ≤S min ≤9mm 2 To form a positioning surface (not marked in the figure). min Up to 0.5mm 2 When the above, the incoming material detection and tooling alignment of the balance block can be easily achieved, and when S min >9mm 2 It can be understood that the positioning surface is a plane perpendicular to the first end surface, for example, it can be coplanar with the axial section of the motor rotor.
[0044] In this technical solution, by min Designed to be within 0.5mm 2 With 9mm 2 A positioning surface with a reasonable area and load-bearing capacity can be provided. At the same time, since the positioning surface is located on the suspended body guide 11 and forms the aforementioned suspended flow-through space 100 with the first end face of the motor rotor, a smaller cross-sectional area can be used to achieve circumferential positioning of the motor rotor through the balancing block during the magnetization process or the assembly process.
[0045] Specifically, during the assembly and magnetization process of the motor rotor (assembly), a balancing block is required for positioning and fixing, but the corresponding positioning tool cannot be accurately positioned on the inclined surface. In the prior art, the axial thickness of the end surface where the balancing block and the aforementioned first end surface of the motor rotor match is usually increased (see Fig.13 As shown), in order to ensure the accurate alignment of the balancing block by the aforementioned positioning tooling, while avoiding displacement of the tooling and the balancing block, which will undoubtedly cause the end face cross-sectional area of the windward end and / or leeward end of the balancing block to be too large, thereby causing excessive wind resistance of the refrigerant airflow. Since the aforementioned positioning surface in the present application is suspended, even if the cross-sectional area is small (that is, it does not need to be too large), the tooling can still accurately position and align it.
[0046] In some embodiments, the balancing weight body 1 is annular, and the cross-sectional area of the balancing weight body 1 is S, S min ≤S / 4, so that the head size of the suspended guide body 11 can match the cross-sectional area of the balancing block body 1, ensuring the effective guidance of the refrigerant airflow, thereby reducing the flow resistance of the refrigerant airflow and reducing the compressor noise.
[0047] In another feasible embodiment, the balancing block body 1 is annular, the radial thickness of the balancing block body 1 is B, the axial thickness is H, the radial span of the positioning surface is b, the axial span is h, b≤B / 2, h≤H / 2, so that the head size of the suspended guide body 11 can match the cross-sectional area of the balancing block body 1, ensuring the effective guidance of the refrigerant airflow, thereby reducing the flow resistance of the refrigerant airflow and reducing the noise of the compressor. The aforementioned radial span refers to the maximum size of the positioning surface in the direction from the radial inner side to the radial outer side of the balancing block body 1, and the aforementioned axial span refers to the maximum size of the positioning surface in the direction from the bottom end to the top end (that is, away from the axial direction of the motor rotor) of the balancing block body 1. Especially when b≤B / 2, the eddy current phenomenon generated by the smooth approach of the positioning surface and the radial inner side and / or the radial inner side surface of the guide when the refrigerant flows inside and outside the radial direction of the motor rotor can be significantly reduced, further reducing the operating noise of the compressor. In a specific embodiment, the aforementioned positioning surface is a rectangle, and correspondingly, the aforementioned radial span is also the radial width, and the aforementioned axial span is also the axial thickness.
[0048] It should be particularly emphasized that the limitation of the radial span (i.e., lateral span) and axial span (i.e., longitudinal span) of the aforementioned positioning surface can limit the area of the positioning surface to a relatively reasonable and small value, which can reduce the outward and upward pumping volume of the refrigerant, and the smaller radial span can reduce the vortex volume, and the hanging and gradually increasing trend forms a downward pumping effect, further reducing the oil discharge of the compressor. In addition, the radial outer side of the guide gradually approaches the inner side and / or the radial inner side of the guide gradually approaches the outer side, objectively forming a rounded structure, which can solve or reduce the generation of turbulence. It can be understood that a large lateral span will form a flow path from the inside to the end face and then to the outside, and each change in the flow path will form a vortex, and the larger the lateral span, the more serious the vortex.
[0049] In some embodiments, the radially outer side surface and the radially inner side surface of the guide are curved surfaces (such as Figures 1 to 3 , Figures 5 to 12 As shown, it can be a circular arc surface) or an inclined surface (such as Figure 4 shown).
[0050] In some embodiments, the balancing weight body 1 has an equal thickness plane passing through the midpoint of its axial thickness, and the equal thickness plane is arranged parallel to and spaced from the first end surface, and the suspended body guide 11 is symmetrical about the equal thickness plane.
[0051] In this technical solution, the suspended guide body 11 is designed to form a symmetrical structure about an equal thickness plane passing through the midpoint of the axial thickness of the balancing block body 1, and the reverse characteristics of the upper and lower symmetrical guide direction of the suspended guide body 11 can be used to eliminate the axial pumping effect to the greatest extent, and can also reduce the axial force applied to the motor shaft during the rotation of the balancing block to a certain extent. In addition, the inclination angle of the corresponding guide surface can be designed to be relatively small.
[0052] like Fig.11 As shown, in some embodiments, the suspended flow space 100 is formed by a smooth curved surface inclined toward the equal thickness plane. The suspended flow space 100 is formed by the smooth curved surface, which can further reduce the windward resistance during the rotation of the balancing block.
[0053] In some other feasible implementations, the suspended body guide 11 is in the shape of a frustum, as shown in FIG. Figures 5 to 10 The frustum of a cone as shown; or Figure 4 As shown, the frustum is a quadrangular frustum. Preferably, the edges of the quadrangular frustum are smoothly connected via rounded corners to further reduce the wind resistance during the rotation of the balancing weight.
[0054] According to an embodiment of the present invention, there is further provided a motor rotor assembly, comprising a motor rotor and a balancing block assembled on an end surface of the motor rotor, wherein the balancing block is the above-mentioned balancing block.
[0055] According to an embodiment of the present invention, a compressor is further provided, comprising a motor rotor and a balancing block assembled on an end surface of the motor rotor facing an exhaust pipe of the compressor, wherein the balancing block is the above-mentioned balancing block.
[0056] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.
[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.
Claims
1. A balancing weight, characterized in that: Assembled on the first end face of the motor rotor, the balancing block comprises a balancing block body (1), the balancing block body (1) extends along the circumference of the motor rotor, the balancing block body (1) has a windward end and a leeward end, at least the windward end has a suspended flow guide (11) extending along the circumference of the motor rotor, a suspended flow passage space (100) is formed between the side of the suspended flow guide (11) close to the first end face and the first end face, the suspended flow guide (11) has a flow guide radial outer side face and a flow guide radial inner side face, projected on the radial face of the motor rotor, the flow guide radial outer side face gradually approaches the radial inner side of the motor rotor and / or the flow guide radial inner side face gradually approaches the radial outer side of the motor rotor so that the cross section of the suspended flow guide (11) becomes smaller and smaller along the circumference away from the balancing block body (1).
2. The balancing weight according to claim 1, characterized in that: The suspended body guide (11) and the balancing block body (1) are integrally formed.
3. The balancing weight according to claim 1, characterized in that: The minimum area of each cross section of the suspended body guide (11) is S min , 0.5mm 2 ≤S min ≤9mm 2 To form a positioning surface.
4. The balancing weight according to claim 3, characterized in that: The balancing weight body (1) is in the shape of a ring, and the cross-sectional area of the balancing weight body (1) is S, S min ≤S / 4, and / or, the radial thickness of the balancing weight body (1) is B, the axial thickness is H, the radial span of the positioning surface is b, the axial span is h, b≤B / 2, h≤H / 2.
5. The balancing weight according to claim 2, characterized in that: The guide radial outer side surface and the guide radial inner side surface are curved surfaces or inclined surfaces.
6. The balancing weight according to claim 1, characterized in that: The balancing weight body (1) has an equal thickness plane passing through the midpoint of its axial thickness, and the equal thickness plane is arranged parallel to and spaced from the first end face, and the suspended body guide (11) is symmetrical about the equal thickness plane; or, the suspended body guide (11) is in the shape of a truncated cone.
7. The balancing weight according to claim 6, characterized in that: The suspended flow space (100) is formed by a smooth curved surface inclined toward the equal thickness plane.
8. The balancing weight according to claim 6, characterized in that: The frustum shape is a circular frustum shape; or, the frustum shape is a quadrangular frustum shape, and the edges of the quadrangular frustum shape are smoothly connected via rounded corners.
9. A motor rotor assembly, comprising a motor rotor and a balancing block assembled on an end surface of the motor rotor, characterized in that: The balancing weight is the balancing weight according to any one of claims 1 to 8.
10. A compressor, comprising a motor rotor and a balancing block assembled on an end surface of the motor rotor facing an exhaust pipe of the compressor, characterized in that: The balancing weight is the balancing weight according to any one of claims 1 to 8.