Balance block, motor rotor assembly and compressor
By designing a balancing block with a suspended guide fluid, the problem of refrigerant turbulence in the compressor was solved, noise and oil discharge rate were reduced, lubrication was ensured, and stable operation of the compressor was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-04-03
AI Technical Summary
The balance block in the existing compressor acts like a fan for the refrigerant during rotation, which turbulent the refrigerant flow field, increases noise and oil discharge rate, and poses a risk of insufficient lubrication.
Design a balance block including a suspended guide fluid to form a suspended flow space, reducing the frontal area, and reduce refrigerant resistance by designing the outer and inner sides of the guide fluid to avoid pumping action. The suspended guide fluid is integrally molded with the balance block body to simplify manufacturing and assembly.
It significantly reduces refrigerant airflow resistance, reduces compressor noise and oil discharge, ensures sufficient lubrication, prevents flow field disturbance, and improves compressor operating stability.
Smart Images
Figure CN224083339U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of compressor design technology, specifically relating to a balance block, a motor rotor assembly, and a compressor. Background Technology
[0002] In existing compressors, the balance block has a large frontal area, which causes it to rotate with the motor rotor during operation, creating a fan effect. This drives the refrigerant to flow radially outward and axially upward towards the balance block. This disrupts the internal flow field of the compressor, exacerbating compressor noise (caused by the impact of refrigerant flow with the compressor casing and motor stator). Furthermore, the pumping action of the balance block increases the oil discharge rate and volume of the compressor's exhaust refrigerant, posing a risk of insufficient lubrication within the compressor. Utility Model Content
[0003] Therefore, this utility model provides a balance block, a motor rotor assembly, and a compressor, which can overcome the technical problem in the related art where the balance block on the motor rotor acts as a fan for the refrigerant inside the compressor during compressor operation, causing the refrigerant to pump outward and upward, disrupting the internal flow field of the compressor, leading to increased compressor noise, increased oil discharge rate and amount of the compressor exhaust refrigerant, and the risk of insufficient lubrication inside the compressor.
[0004] To address the aforementioned problems, this utility model provides a balance block assembled on the first end face of a motor rotor. The balance block includes a balance block body extending circumferentially along the motor rotor. The balance block body has a windward end and a leeward end. At least the windward end has a suspended guide fluid extending circumferentially along the motor rotor. A suspended flow space is formed between the side of the suspended guide fluid near the first end face and the first end face. The suspended guide fluid has a guiding radial outer side and a guiding radial inner side, projected onto the radial surface of the motor rotor. The guiding radial outer side gradually approaches the guiding radial inner side of the motor rotor, and / or the guiding radial inner side gradually approaches the guiding radial outer side of the motor rotor, so that the cross-section of the suspended guide fluid becomes smaller along the circumferential direction away from the balance block body.
[0005] In some embodiments, the suspended fluid guide is integrally formed with the main body of the balance block.
[0006] In some embodiments, the minimum area of each cross-section of the suspended guide fluid is S. min 0.5mm 2 ≤S min ≤9mm 2To form a positioning surface, and / or, the radial thickness of the main body of the balance block 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 main body of the balance block is annular, and the cross-sectional area of the main body of the balance block is S, S min ≤S / 4.
[0008] In some embodiments, the outer radial surface and the inner radial surface of the guide are curved surfaces or inclined surfaces.
[0009] In some embodiments, the balance block body has a plane of uniform thickness passing through the midpoint of its axial thickness, and the plane of uniform thickness is parallel and spaced apart from the first end face, and the suspended guide is symmetrical about the plane of uniform thickness; or, the suspended guide is frustoconical.
[0010] In some embodiments, the suspended flow space is formed by a smooth curved surface inclined toward the plane of uniform thickness.
[0011] In some embodiments, the frustum shape is a circular frustum shape; or, the frustum shape is a square frustum shape, and the edges of the square frustum shape are smoothly connected by rounded corners.
[0012] This utility model also provides a motor rotor assembly, including a motor rotor and a balance block assembled on one end face of the motor rotor, wherein the balance block is the balance block described above.
[0013] This utility model also provides a compressor, including a motor rotor and a balance block assembled on the end face of the motor rotor facing the exhaust pipe side of the compressor, wherein the balance block is the balance block described above.
[0014] The balance block, motor rotor assembly, and compressor provided by this utility model have the following beneficial effects:
[0015] The suspended flow space formed between the windward and / or leeward ends of the balance block body and the first end face of the motor rotor reduces the windward area of the balance block during rotation. This significantly reduces refrigerant airflow resistance. Furthermore, the suspended design effectively reduces the pumping action along the motor rotor axis during balance block rotation. The design of the outer and / or inner radial sides of the suspended flow guide being close to each other results in the cross-section of the suspended flow guide decreasing in the circumferential direction away from the balance block body. This further reduces refrigerant airflow resistance and significantly reduces the radial width of the suspended flow guide. This reduces the outward pumping action along the motor rotor during balance block rotation, effectively preventing the pumping action from disrupting the internal flow field of the compressor. This reduces compressor operating noise and lowers the oil discharge rate and amount of the compressor exhaust refrigerant, ensuring sufficient lubrication of the internal compressor components.
[0016] By S min Designed to be within 0.5mm 2 With 9mm 2 Between them, a positioning surface with a reasonable area and load-bearing capacity can be provided. At the same time, since this positioning surface is on the suspended guide and forms the aforementioned suspended flow space between it and 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 balance block during the magnetization process or assembly process.
[0017] When b≤B / 2, the eddy current phenomenon generated by the refrigerant flowing in and out of the motor rotor radially at the smooth approach of the positioning surface and the radial inner side and / or the connection position of the guide radial inner side can be significantly reduced, thereby further reducing the compressor operating noise;
[0018] By designing the suspended guide fluid as a plane of equal thickness about the midpoint of the axial thickness of the balance block body, a symmetrical structure can be formed. This can utilize the reverse characteristics of the symmetrical flow direction of the suspended guide fluid to eliminate the axial pumping effect to the greatest extent, while also reducing the axial force applied to the motor shaft during the rotation of the balance block. Attached Figure Description
[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0020] Figure 1 This is a three-dimensional structural diagram of the balance block in the first embodiment of this utility model;
[0021] Figure 2 yes Figure 1 The front view;
[0022] Figure 3 yes Figure 1 Top view;
[0023] Figure 4 This is a three-dimensional structural diagram of the balance block according to the second embodiment of the present invention;
[0024] Figure 5 This is a three-dimensional structural diagram of the balance block according to the third embodiment of the present invention;
[0025] Figure 6 yes Figure 5 Top view;
[0026] Figure 7 This is a three-dimensional structural diagram of the balance block according to the fourth embodiment of the present invention;
[0027] Figure 8 yes Figure 7 Top view;
[0028] Figure 9 This is a three-dimensional structural diagram of the balance block according to the fifth embodiment of this utility model;
[0029] Figure 10 yes Figure 9 Top view;
[0030] Figure 11 This is a three-dimensional structural diagram of the balance block according to the fifth embodiment of this utility model;
[0031] Figure 12 yes Figure 11 Side view;
[0032] Figure 13 This is a schematic diagram of a three-dimensional structure of a balance block in related technologies.
[0033] The attached figures are labeled as follows:
[0034] 1. Balance block body; 11. Suspended flow guide; 12. Connecting hole; 100. Suspended flow space. 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 ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0038] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0039] See Figures 1 to 12As shown, according to an embodiment of the present invention, a balance block is provided, assembled on a first end face (not shown in the figure) of a motor rotor (not shown in the figure). The first end face is the end face of the motor rotor near the compressor exhaust port (not shown in the figure). The balance block includes a balance block body 1, which is assembled on the first end face. The balance block body 1 extends circumferentially along the motor rotor. The balance block body 1 has a windward end (not labeled in the figure) and a leeward end (not labeled in the figure). At least the windward end has a suspended guide 11 extending circumferentially along the motor rotor. In a preferred embodiment, both the windward end and the leeward end have the aforementioned suspended guide 11. The side of the suspended guide 11 near the first end face is connected to the first end face. A suspended flow space 100 is formed between the surfaces. The suspended guide body 11 has a radially outer guide surface (not labeled in the figure) and a radially inner guide surface (not labeled in the figure), projected onto the radial surface of the motor rotor (i.e., any plane perpendicular to the rotation axis of the motor rotor). The radially outer guide surface gradually approaches (preferably smoothly approaches) the radially inner guide surface of the motor rotor and / or the radially inner guide surface gradually approaches (preferably smoothly approaches) the radially outer guide surface of the motor rotor, so that the cross-section of the suspended guide body 11 becomes smaller and smaller along the circumference away from the balance block body 1. The aforementioned cross-section refers to the cross-section obtained by the sequential intersection of each radial surface (i.e., the axial section of the motor rotor) along the circumference of the motor rotor with the suspended guide body 11 through the rotation axis of the motor rotor. The aforementioned balance block body 1 has connecting holes 12 extending through its opposite sides, through which a reliable assembly connection between the balance block and the motor rotor is achieved.
[0040] In this technical solution, the suspended flow space 100 formed between the suspended guide fluid 11 on the windward and / or leeward ends of the balance block body 1 and the first end face of the motor rotor can reduce the windward area of the balance block during rotation. This significantly reduces the refrigerant airflow resistance. Furthermore, the suspended design effectively reduces the pumping action along the axial direction of the motor rotor during balance block rotation. The design of the outer and / or inner radial sides of the suspended guide fluid 11 being close to each other makes the cross-section of the suspended guide fluid 11 gradually smaller along the circumferential direction away from the balance block body 1. This further reduces the refrigerant airflow resistance and significantly reduces the radial width of the suspended guide fluid 11. This reduces the outward pumping action along the radial direction of the motor rotor during balance block rotation, effectively preventing the pumping action from disrupting the internal flow field of the compressor. This reduces compressor operating noise and decreases the oil discharge rate and amount of the compressor exhaust refrigerant, ensuring sufficient lubrication of the internal components of the compressor.
[0041] In some embodiments, the suspended fluid guide 11 is integrally formed with the balance block body 1, and the aforementioned integral forming is specifically achieved by means such as machining, injection molding followed by milling.
[0042] In this technical solution, the balance block body 1 and the suspended guide fluid 11 are formed into an organic whole by integral molding, which can simplify the manufacturing process of the balance block and the assembly process.
[0043] In some embodiments, the minimum area of each cross-section of the suspended guide fluid 11 is S. min In a place like Figure 9 In the described embodiment, S min It can approach zero, at which point the smaller suspended guide fluid 11 at the head has a better effect on guiding airflow and reducing wind resistance. In a more preferred embodiment, 0.5mm 2 ≤S min ≤9mm 2 To form a positioning surface (not indexed in the figure). When S min Reaching 0.5mm 2 When the above conditions are met, incoming material inspection of the balance block and tooling alignment can be easily achieved, while when S min >9mm 2 This can lead to excessive wind resistance. It is understandable that the aforementioned positioning surface is a plane perpendicular to the aforementioned first end face, for example, it can be coplanar with the axial section of the motor rotor.
[0044] In this technical solution, by using S min Designed to be within 0.5mm 2 With 9mm 2 Between them, a positioning surface with a reasonable area and load-bearing capacity can be provided. At the same time, since the positioning surface is on the suspended guide 11 and forms the aforementioned suspended flow space 100 between it and the first end face of the motor rotor, the circumferential positioning of the motor rotor through the balance block can be achieved with a small cross-sectional area.
[0045] Specifically, during the assembly and magnetization process of the motor rotor (assembly), a balance block is needed for positioning and fixation. However, the corresponding positioning fixture cannot be accurately positioned on the inclined surface. In the prior art, the axial thickness of the end face where the balance block mates with the aforementioned first end face of the motor rotor is usually increased (see...). Figure 13 As shown in the figure, in order to ensure that the aforementioned positioning fixture accurately aligns the balance block, and at the same time avoid the fixture and the balance block from shifting, this would undoubtedly lead to the cross-sectional area of the end face of the balance block at the windward end and / or the leeward end being too large, which would result in the phenomenon of excessive air resistance of the refrigerant flow. However, the aforementioned positioning surface in this application is suspended, so even if the cross-sectional area is small (i.e., it does not need to be too large), the fixture can accurately position and align it.
[0046] In some embodiments, the balance block body 1 is annular, and the cross-sectional area of the balance block body 1 is S, S min ≤S / 4, so that the head size of the suspended guide fluid 11 can match the cross-sectional area of the balance block body 1, ensuring effective guidance of the refrigerant airflow, thereby reducing the flow resistance of the refrigerant airflow and reducing compressor noise.
[0047] In another feasible embodiment, the balance block body 1 is annular, with a radial thickness of B and an axial thickness of H. The radial span of the positioning surface is b, and the axial span is h, where b ≤ B / 2 and h ≤ H / 2. This allows the head size of the suspended guide fluid 11 to match the cross-sectional area of the balance block body 1, ensuring effective guidance of the refrigerant flow and reducing the flow resistance of the refrigerant flow, thus reducing compressor noise. The aforementioned radial span refers to the maximum dimension of the positioning surface in the radial direction from the inner to the outer side of the balance block body 1, and the aforementioned axial span refers to the maximum dimension of the positioning surface in the direction from the bottom to the top (i.e., the axial direction away from the motor rotor) of the balance block body 1. Especially when b ≤ B / 2, it can significantly reduce the vortex phenomenon generated by the refrigerant flowing radially inward and outward in the motor rotor at the smooth proximity of the positioning surface and the radial inner side and / or the connection position of the radial inner side of the guide fluid, further reducing compressor operating noise. In a specific embodiment, the aforementioned positioning surface is rectangular, in which case the aforementioned radial span is also the radial width, and the aforementioned axial span is also the axial thickness.
[0048] It is particularly important to emphasize that limiting the radial span (i.e., lateral span) and axial span (i.e., longitudinal span) of the aforementioned positioning surface restricts the area of the positioning surface to a relatively small and reasonable value. This reduces the amount of refrigerant pumped outward and upward, while the smaller radial span reduces vortex flow. The suspended and gradually increasing trend creates a downward pumping effect, further reducing the compressor's oil discharge. In addition, the gradual convergence of the outer radial side of the guide tube towards the inner side and / or the gradual convergence of the inner radial side towards the outer side objectively forms a rounded corner structure, which can solve or reduce the generation of turbulence. It is understandable that a large lateral span will form a flow path from the inner side to the end face and then to the outer side. Each transition of the flow path will generate vortices, and the larger the lateral span, the more severe the vortices.
[0049] In some embodiments, the outer radial surface and the inner radial surface of the guide are curved surfaces (e.g., Figures 1 to 3 , Figures 5 to 12 As shown, it can be a circular arc surface or a sloped surface (such as...). Figure 4 (As shown).
[0050] In some embodiments, the balance block body 1 has a plane of equal thickness passing through the midpoint of its axial thickness, and the plane of equal thickness is parallel and spaced apart from the first end face, and the suspended fluid guide 11 is symmetrical about the plane of equal thickness.
[0051] In this technical solution, the suspended guide fluid 11 is designed as a symmetrical structure with respect to a plane of uniform thickness about the midpoint of the axial thickness of the balance block body 1. This design utilizes the reversed flow direction of the suspended guide fluid 11 to minimize axial pumping action while also reducing the axial force applied to the motor shaft during balance block rotation. Furthermore, it allows for a relatively small tilt angle on the corresponding guide surface.
[0052] like Figure 11 As shown, in some embodiments, the suspended flow space 100 is formed by a smooth curved surface inclined toward the plane of equal thickness. By forming the suspended flow space 100 by the smooth curved surface, the wind resistance during the rotation of the balance block can be further reduced.
[0053] In other feasible embodiments, the suspended fluid guide 11 is frustoconical in shape, specifically as follows: Figures 5 to 10 The frustum shape shown; or, as shown Figure 4 As shown, the frustum shape is a square frustum shape. Preferably, the edges of the square frustum shape are smoothly connected by rounded corners to further reduce the wind resistance during the rotation of the balance block.
[0054] According to an embodiment of the present invention, a motor rotor assembly is also provided, including a motor rotor and a balance block assembled on one end face of the motor rotor, wherein the balance block is the balance block described above.
[0055] According to an embodiment of the present invention, a compressor is also provided, including a motor rotor and a balance block assembled on the end face of the motor rotor facing the exhaust pipe side of the compressor, wherein the balance block is the balance block described above.
[0056] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.
[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A balance block, characterized by, The balance block assembled on the first end face of the motor rotor comprises a balance block body (1) extending along the circumference of the motor rotor, the balance block body (1) having a windward end and a leeward end, at least the windward end having a suspended flow guide (11) extending along the circumference of the motor rotor, the suspended flow guide (11) being close to the first end face and forming a suspended flow space (100) between the windward end and the first end face, the suspended flow guide (11) having a flow guide radial outer side and a flow guide radial inner side, the flow guide radial outer side gradually approaching the radial inner side of the motor rotor and / or the flow guide radial inner side gradually approaching 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 balance block body (1).
2. The balance block of claim 1, wherein, The suspended flow guide (11) is integrally formed with the balance block body (1).
3. The balance block of claim 1, wherein, The area minimum in each cross section of the floating flow conductor (11) is S min 0.5 mm 2 ≤ S min ≤ 9 mm 2 to form a positioning surface.
4. The balance block of claim 3, wherein, The balance block body (1) is circular ring shape, the cross section area of the balance block body (1) is S, S min ≤S / 4, and / or, the radial thickness of the balance 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.
5. The balance block of claim 2, wherein, The flow guide radial outer side and the flow guide radial inner side are curved surfaces or inclined surfaces.
6. The balance block of claim 1, wherein, The balance block body (1) has an equal-thickness plane passing through the midpoint of the axial thickness, the equal-thickness plane being arranged in parallel and spaced apart from the first end face, and the suspended flow guide (11) is symmetrical about the equal-thickness plane; or the suspended flow guide (11) is a frustum.
7. The balance block of claim 6, wherein, The suspended flow space (100) is formed by a smooth curved surface inclined toward the equal-thickness plane.
8. The balance block of claim 6, wherein, The frustum is a circular frustum; or the frustum is a quadrangular frustum, and the edges of the quadrangular frustum are smoothly connected via rounded corners.
9. An electric motor rotor assembly comprising an electric motor rotor and a balance weight assembled to an end face of said electric 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 weight assembled to an end surface of said motor rotor on a side of said motor rotor toward an exhaust pipe of said compressor, characterized by, The balance block is the balance block according to any one of claims 1 to 8.