Balance block structure and compressor with same

Abstract

The invention provides a balance block structure and a compressor with the balance block structure, the balance block structure comprises a balance block main body, the balance block main body is provided with an outer side surface, the outer side surface is provided with a plurality of grooves, and the plurality of grooves are arranged at intervals along the axial direction of the balance block main body and extend along the circumferential direction of the balance block main body. According to the balance block structure, the problem that in the prior art, due to the fact that a balance block can generate gas friction resistance, friction power consumption of a compressor is increased is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a balancing block structure and a compressor having the same. Background Art

[0002] The working principle of a rolling rotor compressor is as follows: a cylindrical roller is placed within a cylindrical cylinder. The roller's center of rotation is eccentric to the center of the cylinder. Driven by a motor, the roller rotates, driven by an eccentric crankshaft sleeved on its inner diameter. A vane, capable of sliding back and forth, is placed within the cylinder's vane slot. A pump spring is attached to one end, ensuring that one end of the vane is always in contact with the outer diameter of the roller. The vane reciprocates within the slot. The vane, the inner surface of the cylinder, the outer surface of the roller, and the upper and lower flange end faces form high-pressure and low-pressure chambers. During operation, the crankshaft drives the roller through one rotation, drawing air from the low-pressure chamber and exhausting it from the high-pressure chamber, completing a single operating cycle. This process repeats itself continuously.

[0003] Crankshaft eccentricity generates centrifugal force, and counterbalancing weights are often added to the upper and lower ends of the motor to balance the centrifugal force and its centrifugal torque. However, the addition of these weights creates greater wind resistance on the windward side during rotation, increasing compressor power consumption. This power consumption increases with higher speeds.

[0004] Currently, the main approach to addressing this issue is to modify the windward surface's profile. However, while this can reduce drag, its effectiveness is limited. Therefore, to further reduce wind resistance and power consumption, improvements to existing technologies are necessary. Summary of the Invention

[0005] The main purpose of the present invention is to provide a balancing block structure and a compressor having the same, so as to solve the problem in the prior art that the balancing block generates gas friction resistance, which causes increased friction power consumption of the compressor.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a balancing block structure is provided, including a balancing block body, the balancing block body having an outer side surface, and a plurality of grooves are arranged at intervals along the axial direction of the balancing block body and all extend along the circumferential direction of the balancing block body.

[0007] Furthermore, the width of the groove gradually decreases from the opening to the bottom of the groove.

[0008] Furthermore, the plurality of grooves are arranged at equal intervals along the axial direction of the balancing weight body.

[0009] Furthermore, the cross section of each groove is symmetrical, wherein the symmetry axis of the cross section of each groove extends along the depth direction of the groove, and the cross section of the groove is arranged perpendicular to the extension direction of the groove.

[0010] Furthermore, a plurality of groove groups are provided on the outer surface, and the plurality of groove groups are spaced apart along the axial direction of the balance weight body; each groove group includes at least two grooves spaced apart along the axial direction of the balance weight body; wherein, along the arrangement direction of the at least two grooves of the groove group, the depth of the at least two grooves of the groove group increases successively, and the opening width increases successively.

[0011] Furthermore, each groove group includes a first groove, the opening width of the first groove is s1, 0.08mm≤s1≤0.15mm; the depth of the first groove is h1, 0.06mm≤h1≤0.12mm; and / or, each groove group includes a second groove, the opening width of the second groove is s2, 0.16mm≤s2≤0.3mm; the depth of the second groove is h2, 0.12mm≤h2≤0.24mm.

[0012] Furthermore, along the axial direction of the balancing weight body, the spacing between any two adjacent grooves is L, and 1.5s1≤L≤3s1.

[0013] Furthermore, the balancing weight body has a first end face and a second end face arranged in sequence along its axial direction, wherein the spacing between the grooves close to the first end face among the multiple grooves and the first end face is greater than or equal to 0.15 mm; and / or, the spacing between the grooves close to the second end face among the multiple grooves and the second end face is greater than or equal to 0.15 mm.

[0014] Furthermore, the cross-sectional shape of each groove is any one of a triangle, a trapezoid and an arc; and / or, the outer surface includes a plurality of arc surfaces arranged in sequence along its circumferential direction, each arc surface has a preset curvature, and each groove extends through at least two arc surfaces.

[0015] According to another aspect of the present invention, a compressor is provided, comprising a first balancing block, a second balancing block and a rotor, wherein the first balancing block and the second balancing block are respectively arranged on two end faces of the rotor, wherein the first balancing block and the second balancing block are both the above-mentioned balancing block structures.

[0016] By applying the technical solution of the present invention, a plurality of grooves are provided on the outer surface of the balancing block body of the balancing block structure. The plurality of grooves are spaced apart along the axial direction of the balancing block body and extend along the circumferential direction of the balancing block body. When the fluid passes over the groove, a "reverse vortex pair" will be generated in the groove. The existence of the reverse vortex pair changes the characteristics of the local flow field. The two vortex pairs in opposite directions will attract each other, causing the vortex pairs to tend to merge and form a "secondary vortex" inside the groove. The secondary vortex can effectively limit the ability of the vortex to entrain low-speed gas and lift the low-speed fluid upward, thereby reducing the number of low-speed flow bands on the windward surface of the balancing block structure, effectively hindering the turbulent burst process, thereby improving the fluid motion stability of the boundary layer, reducing the gas friction resistance, and then reducing the friction power consumption of the compressor, thereby improving the performance of the compressor. It can be seen that the balancing block structure solves the problem in the prior art that the friction power consumption of the compressor increases due to the gas friction resistance generated by the balancing block. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram showing an embodiment of a balancing weight structure according to the present invention is shown;

[0019] Figure 2 A front view showing an embodiment of a balancing weight structure according to the present invention;

[0020] Figure 3 Shown Figure 2 A local enlarged view of point A in FIG;

[0021] Figure 4 A cross-sectional view showing an embodiment of a balancing weight structure according to the present invention;

[0022] Figure 5 Shown Figure 4 A local enlarged view of point B in FIG;

[0023] Figure 6 A schematic diagram showing a groove of a balancing weight structure according to the present invention having a triangular cross-section (with rounded corners);

[0024] Figure 7 A schematic diagram showing a groove of a balancing weight structure according to the present invention having a trapezoidal cross section is shown;

[0025] Figure 8 A schematic diagram showing that the cross section of the groove of the balancing weight structure according to the present invention is arched;

[0026] Figure 9A schematic diagram showing an embodiment of a compressor according to the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Balance weight body; 11. Outer surface;

[0029] 20. Grooves;

[0030] 30. Groove group; 31. First groove; 32. Second groove;

[0031] 1. First balancing mass; 2. Second balancing mass; 3. Rotor. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] The present invention provides a balancing block structure, please refer to Figures 1 to 8 , including a balancing block body 10, the balancing block body 10 has an outer side surface 11, and a plurality of grooves 20 are arranged on the outer side surface 11. The plurality of grooves 20 are arranged at intervals along the axial direction of the balancing block body 10 and extend along the circumferential direction of the balancing block body 10.

[0036] The outer side surface 11 of the balancing block body 10 of the balancing block structure of the present invention is provided with a plurality of grooves 20, and the plurality of grooves 20 are arranged at intervals along the axial direction of the balancing block body 10 and all extend along the circumferential direction of the balancing block body 10. When the fluid passes over the groove 20, a "reverse vortex pair" will be generated in the groove 20. The existence of the reverse vortex pair changes the characteristics of the local flow field. The two vortex pairs in opposite directions will attract each other, causing the vortex pairs to tend to merge and form a "secondary vortex" inside the groove 20. The secondary vortex can effectively limit the ability of the vortex to entrain low-speed gas and lift the low-speed fluid upward, thereby reducing the number of low-speed flow bands on the windward surface of the balancing block structure, effectively hindering the progress of the turbulent burst process, thereby improving the fluid motion stability of the boundary layer, reducing the gas friction resistance, and then reducing the friction power consumption of the compressor, and improving the performance of the compressor. It can be seen that the balancing block structure solves the problem in the prior art that the friction power consumption of the compressor increases due to the gas friction resistance generated by the balancing block.

[0037] In addition, compared with the smooth outer surface 11 without grooves, the concave grooves increase the surface area of the balance block structure, thereby increasing the heat conduction and convection heat transfer between the balance block structure and the refrigerant, thereby increasing the heat dissipation of the motor rotor, which can improve the motor service life and output power to a certain extent.

[0038] It should be noted that the outer side surface 11 of the balance weight body 10 is a side away from the rotation center of the rotor.

[0039] In a specific implementation, the groove 20 is an arc-shaped groove, which is in the same direction as the gas flow. Such a setting can improve the drag reduction effect and reduce the gas friction resistance.

[0040] Specifically, the width of the groove 20 gradually decreases from its opening to its bottom. The width of the groove 20 coincides with the axial direction of the balancing weight body 10. This arrangement enhances drag reduction, thereby reducing compressor friction power consumption and improving compressor performance.

[0041] Specifically, the plurality of grooves 20 are arranged at equal intervals along the axial direction of the balancing weight body 10. Such an arrangement reduces flow resistance, optimizes flow field distribution, and has a better drag reduction effect.

[0042] Specifically, the cross section of each groove 20 is symmetrical, wherein the symmetry axis of the cross section of each groove 20 extends along the depth direction of the groove 20 , and the cross section of the groove 20 is perpendicular to the extension direction of the groove 20 .

[0043] In specific implementation, the cross-sections of each groove 20 are symmetrical structures. Compared with asymmetrical cross-sections, the symmetry of the cross-sections can guide the fluid to flow in a specific direction, reduce flow resistance, optimize flow field distribution, and achieve better drag reduction effects.

[0044] Specifically, the outer side surface 11 is provided with multiple groove groups 30, spaced apart along the axial direction of the weight body 10. Each groove group 30 includes at least two grooves 20 spaced apart along the axial direction of the weight body 10. The depths and opening widths of the grooves 20 in each groove group 30 increase sequentially along the arrangement direction. In practice, staggered arrangements of grooves 20 of varying sizes can achieve a drag reduction effect.

[0045] Alternatively, as Figure 5 As shown, each groove group 30 includes a first groove 31, the opening width of the first groove 31 is s1, 0.08mm≤s1≤0.15mm; the depth of the first groove 31 is h1, 0.06mm≤h1≤0.12mm; and / or, each groove group 30 includes a second groove 32, the opening width of the second groove 32 is s2, 0.16mm≤s2≤0.3mm; the depth of the second groove 32 is h2, 0.12mm≤h2≤0.24mm.

[0046] During specific implementation, the groove group 30 includes two grooves of one large and one small size, namely the first groove 31 and the second groove 32, and the first groove 31 and the second groove 32 are staggered along the axial direction of the balance block body 10. The drag reduction principle is as follows: when the fluid passes over the groove 20, a "reverse vortex pair" will be generated in the groove 20. The existence of the reverse vortex pair changes the characteristics of the local flow field. The two vortex pairs in opposite directions will attract each other, causing the vortex pairs to tend to merge and form a "secondary vortex" inside the groove 20. The secondary vortex can effectively limit the ability of the vortex to entrain low-speed gas and lift the low-speed fluid upward, reducing the number of low-speed flow bands on the windward surface of the balance block structure, effectively hindering the turbulent burst process, thereby improving the fluid motion stability of the boundary layer and reducing the gas friction resistance. In addition, compared with a single groove, for different fluid conditions (speed, temperature, etc.), especially for the characteristics of the compressor field that requires frequency conversion, the large and small composite groove design can provide more flexible and efficient drag reduction performance and a wider range of adaptability.

[0047] In specific implementation, the drag reduction rate of the groove 20 is mainly determined by the dimensionless width s+ and depth h+ of the groove 20. When 10≤s+≤30 and 10≤h+≤30 are satisfied, the drag reduction rate reaches the best.

[0048]

[0049] Where: s is the opening width of the groove, h is the depth of the groove, U is the relative speed, v is the viscosity of the refrigerant, C fis the friction coefficient, S is the obstructed area, ρ is the refrigerant density, and F is the surface friction. Therefore, the dimensions of the first groove 31 and the second groove 32 are set to: 0.08mm≤s1≤0.15mm, 0.06mm≤h1≤0.12mm; 0.16mm≤s2≤0.3mm, 0.12mm≤h2≤0.24mm. This range provides optimal drag reduction.

[0050] Specifically, along the axial direction of the balancing weight body 10 , the distance between any two adjacent grooves 20 is L, and 1.5s1≤L≤3s1.

[0051] In practice, the axial spacing L between any two adjacent grooves 20 is preferably maintained between 1.5s1 and 3s1, which provides a relatively good drag reduction effect. If the spacing L is too small, the strength of the isosceles trapezoidal ribs between the grooves 20 will be too low, resulting in a low surface strength. If the spacing L is too large, the drag reduction effect will be reduced.

[0052] Specifically, the balancing weight body 10 has a first end face and a second end face arranged in sequence along its axial direction. The spacing between the grooves 20 closest to the first end face and the first end face is greater than or equal to 0.15 mm; and / or the spacing between the grooves 20 closest to the second end face and the second end face is greater than or equal to 0.15 mm. This arrangement prevents the edge structure from being too rigid.

[0053] Specifically, the cross-sectional shape of each groove 20 is any one of a triangle, a trapezoid and an arc; and / or, the outer surface 11 includes a plurality of arc surfaces arranged in sequence along its circumferential direction, each arc surface has a preset curvature, and each groove 20 extends through at least two arc surfaces.

[0054] In a specific implementation, the cross section of the groove 20 is set to any one of a triangle, a trapezoid and an arcuate shape to ensure the drag reduction effect of the groove 20 .

[0055] Alternatively, as Figure 6 As shown, the top corner of the triangle is rounded, that is, the bottom of the groove 20 is rounded, which can achieve a certain drag reduction effect.

[0056] During specific implementation, the preset curvatures of each arc surface are different. Taking into account the wind resistance, the outer surface 11 is composed of multiple arc surfaces with different curvatures. Although the preset curvatures of each arc surface are different, each groove 20 extends through at least two arc surfaces, that is, from top to bottom, the grooves of the same height on each groove 20 remain connected to reduce wind resistance.

[0057] In practice, the outer side 11 of the balance weight structure of the present invention is provided with an inwardly concave V-shaped groove. This groove effectively improves the gas flow field distribution of the balance weight structure during compressor operation, reduces the frictional resistance of the gas to the balance weight structure, and thus reduces compressor power consumption and improves compressor performance. Furthermore, because the groove structure increases the surface area in contact with the fluid, it improves heat conduction and convection between the rotor and the refrigerant, thereby increasing heat dissipation of the motor rotor and improving the motor's service life and output power.

[0058] The present invention also provides a compressor, please refer to Figure 9 , including a first balancing block 1, a second balancing block 2 and a rotor 3, wherein the first balancing block 1 and the second balancing block 2 are respectively arranged on the two end surfaces of the rotor 3, wherein the first balancing block 1 and the second balancing block 2 are both the balancing block structures of the above embodiment.

[0059] In a specific implementation, the compressor includes a pump body and a motor, wherein the upper and lower end surfaces of the motor's rotor 3 are respectively arranged with a first balancing block 1 and a second balancing block 2. When the compressor is running, the motor's rotor 3 drives the first balancing block 1 and the second balancing block 2 to rotate. Since the refrigerant is viscous, gas friction is generated between the refrigerant gas and the rotating first balancing block 1 and the second balancing block 2, which will cause a certain amount of gas friction resistance. This problem is solved by setting the first balancing block 1 and the second balancing block 2 to the balancing block structure of the above embodiment. In a specific implementation, the balancing block structure for the compressor of the present invention is mainly used to reduce the gas friction resistance to which the balancing block is subjected when the compressor is running, so as to reduce the friction power consumption of the compressor, while increasing the heat dissipation of the motor rotor, which can improve the life and output power of the motor.

[0060] The present invention solves the following technical problem: During compressor operation, the balancing mass structure generates a certain amount of gas friction resistance, which increases the frictional power loss of the compressor. Furthermore, as the frequency increases, the frictional power loss caused by gas friction resistance also increases. In other words, the present invention solves the problem of increased frictional power loss and reduced performance caused by gas friction resistance of the balancing mass during compressor operation.

[0061] The present invention has the following beneficial effects: it improves the gas flow field distribution during operation of the compressor's balancing weight structure, reduces the frictional resistance of the gas to the balancing weight structure, thereby reducing compressor friction power consumption and improving compressor performance. Furthermore, it enhances heat conduction and convection between the rotor and the refrigerant gas, increasing heat dissipation from the motor rotor and extending the motor's service life and output power.

[0062] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0063] The outer side surface 11 of the balancing block body 10 of the balancing block structure of the present invention is provided with a plurality of grooves 20, and the plurality of grooves 20 are arranged at intervals along the axial direction of the balancing block body 10 and all extend along the circumferential direction of the balancing block body 10. When the fluid passes over the groove 20, a "reverse vortex pair" will be generated in the groove 20. The existence of the reverse vortex pair changes the characteristics of the local flow field. The two vortex pairs in opposite directions will attract each other, causing the vortex pairs to tend to merge and form a "secondary vortex" inside the groove 20. The secondary vortex can effectively limit the ability of the vortex to entrain low-speed gas and lift the low-speed fluid upward, thereby reducing the number of low-speed flow bands on the windward surface of the balancing block structure, effectively hindering the progress of the turbulent burst process, thereby improving the fluid motion stability of the boundary layer, reducing the gas friction resistance, and then reducing the friction power consumption of the compressor, and improving the performance of the compressor. It can be seen that the balancing block structure solves the problem in the prior art that the friction power consumption of the compressor increases due to the gas friction resistance generated by the balancing block.

[0064] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A balancing weight structure, comprising a balancing weight body (10), wherein the balancing weight body (10) has an outer side surface (11), characterized in that: A plurality of grooves (20) are provided on the outer side surface (11), and the plurality of grooves (20) are spaced apart along the axial direction of the balancing weight body (10) and extend along the circumferential direction of the balancing weight body (10).

2. The balancing weight structure according to claim 1, characterized in that: The width of the groove (20) gradually decreases in a direction from the opening to the bottom of the groove (20).

3. The balancing weight structure according to claim 1, characterized in that: The plurality of grooves (20) are arranged at equal intervals along the axial direction of the balancing weight body (10).

4. The balancing weight structure according to claim 1, characterized in that: The cross-section of each groove (20) is symmetrical, wherein the symmetry axis of the cross-section of each groove (20) extends along the depth direction of the groove (20), and the cross-section of the groove (20) is arranged perpendicular to the extension direction of the groove (20).

5. The balancing weight structure according to any one of claims 1 to 4, characterized in that: A plurality of groove groups (30) are provided on the outer side surface (11), and the plurality of groove groups (30) are spaced apart along the axial direction of the balancing weight body (10); each of the groove groups (30) includes at least two grooves (20) spaced apart along the axial direction of the balancing weight body (10); Wherein, along the arrangement direction of at least two grooves (20) of the groove group (30), the depths of at least two grooves (20) of the groove group (30) increase sequentially, and the opening widths increase sequentially.

6. The balancing weight structure according to claim 5, characterized in that: Each of the groove groups (30) comprises a first groove (31), the opening width of the first groove (31) is s1, 0.08mm≤s1≤0.15mm; the depth of the first groove (31) is h1, 0.06mm≤h1≤0.12mm; and / or Each of the groove groups (30) includes a second groove (32), the opening width of the second groove (32) is s2, 0.16mm≤s2≤0.3mm; the depth of the second groove (32) is h2, 0.12mm≤h2≤0.24mm.

7. The balancing weight structure according to claim 6, characterized in that: Along the axial direction of the balancing weight body (10), the spacing between any two adjacent grooves (20) is L, and 1.5s1≤L≤3s1.

8. The balancing weight structure according to claim 1, characterized in that: The balancing weight body (10) has a first end face and a second end face arranged in sequence along its axial direction, wherein: The spacing between the groove (20) close to the first end surface among the plurality of grooves (20) and the first end surface is greater than or equal to 0.15 mm; and / or The spacing between the grooves (20) close to the second end surface among the plurality of grooves (20) and the second end surface is greater than or equal to 0.15 mm.

9. The balancing weight structure according to claim 1, characterized in that: The cross-sectional shape of each groove (20) is any one of a triangle, a trapezoid and an arcuate shape; and / or The outer side surface (11) comprises a plurality of arc surfaces sequentially arranged along its circumferential direction, each of the arc surfaces having a preset curvature, and each of the grooves (20) extends through at least two of the arc surfaces.

10. A compressor comprising a first balancing block (1), a second balancing block (2) and a rotor (3), wherein the first balancing block (1) and the second balancing block (2) are respectively arranged on two end faces of the rotor (3), characterized in that: The first balancing weight (1) and the second balancing weight (2) are both balancing weight structures according to any one of claims 1 to 9.

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