Balance block for motor rotor, motor rotor and compressor

Abstract

The invention relates to the technical field of compressors, and discloses a balance block for a motor rotor. The balance block comprises a balance block body and a windward part, and one end face of the balance block body in the circumferential direction is a windward face. The windward part is arranged on the windward side, and the balance block body and the windward part are sequentially arranged in the rotating direction of the balance block body. And the windward area of the windward part is smaller than that of the windward side. The balance block body and the windward part are sequentially arranged in the rotating direction of the balance block body, so that the windward part is arranged in front of the windward side of the balance block body. Through the windward part, drainage of refrigerant fluid can be achieved, so that a refrigerant flow field is changed, pressure distribution is adjusted, and resistance borne by the windward side in the movement process is reduced. And the windward area of the windward part is smaller than that of the windward side, so that the contact area between the balance block and refrigerant fluid can be effectively reduced, and the pressure difference resistance borne by the balance block is reduced. The invention also discloses a motor rotor and a compressor.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to a balancing block for a motor rotor, a motor rotor and a compressor. Background Art

[0002] At present, in rotary compressors, the eccentric part of the crankshaft and the roller have eccentric weights. Usually, balancing blocks are set on the upper and lower end faces of the motor rotor to balance the eccentric weights, which can achieve static and dynamic balance and reduce the vibration and noise level of the compressor. As the speed of the compressor motor rotor increases, the relative rotation speed of the balancing block and the high-temperature and high-pressure refrigerant in the internal environment of the compressor is also increasing. Due to the friction on the surface of the balancing block, the refrigerant flows through the leeward side of the balancing block to form a low-pressure area. The combination of the two produces a greater pressure difference resistance, which not only affects the stability of the compressor rotor operation, but also increases the power consumption of the compressor.

[0003] The related technology discloses a rotor balancing block of a compressor, wherein the rotor balancing block includes a balancing block body and a windward end portion, wherein the balancing block body has a coaxially arranged inner arc surface and an outer arc surface, and an inner surface and an outer surface arranged oppositely; the inner arc surface and the outer arc surface are connected between the inner surface and the outer surface; the windward end portion is formed at a first circumferential end of the balancing block body, and the windward end portion has an inner diverter surface connected to the inner arc surface, and an outer diverter surface connected to the outer arc surface, wherein the inner diverter surface and the outer diverter surface intersect at an edge parallel to the axis of the inner arc surface, which can reduce the resistance to rotor rotation to a certain extent.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] In the related art, since the inner flow dividing surface and the outer flow dividing surface of the windward end intersect at an edge parallel to the axis of the inner arc surface, the refrigerant flows along the inner flow dividing surface and the outer flow dividing surface. The windward end of the balancing block will still be subjected to high pressure when the compressor rotor rotates at high speed, and the front resistance is still large, thereby affecting the stability of the compressor operation.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a balancing block for a motor rotor, a motor rotor, and a compressor, so as to reduce the pressure difference resistance borne by the balancing block and improve the stability of the compressor operation.

[0009] According to a first aspect of an embodiment of the present invention, a balancing block for a motor rotor is provided, comprising: a balancing block main body, one end face of which along the circumferential direction is a windward surface; a windward portion, which is arranged on the windward surface, and the balancing block main body and the windward portion are arranged in sequence along the rotation direction of the balancing block main body; wherein the windward area of ​​the windward portion is smaller than the windward area of ​​the windward surface.

[0010] In some embodiments, the windward portion includes: a connector, one end of which is connected to the windward surface and extends outward from the windward surface; a windward body connected to the other end of the connector, the windward body is a first distance away from the windward surface, and a side of the windward body facing away from the connector serves as the windward side of the windward portion.

[0011] In some embodiments, the connector is connected to a first position on the windward surface, the first position being located at an intersection line between a radial mid-section of the balancing block body and the windward surface; and / or, the connector is connected to a second position on the windward surface, the second position being located at 1 / 3 to 2 / 3 of the balancing block body in the height direction.

[0012] In some embodiments, along the rotation direction of the balancing weight body, the cross-sectional area of ​​the connecting body is less than or equal to the windward area of ​​the windward body.

[0013] In some embodiments, the length of the connector and the maximum length dimension of the projection of the windward surface on a plane perpendicular to the rotation direction of the balancing block body satisfy the following relationship: D≤L≤2D; wherein L is the length of the connector, and D is the maximum length dimension of the projection of the windward surface on a plane perpendicular to the rotation direction of the balancing block body.

[0014] In some embodiments, the windward area of ​​the windward body and the windward area of ​​the windward surface satisfy the following relationship: 8%×s2≤s1≤16%×s2; wherein s1 is the windward area of ​​the windward body, and s2 is the windward area of ​​the windward surface.

[0015] In some embodiments, the windward side of the windward body is in the shape of a disk, a hemisphere, or a cone.

[0016] In some embodiments, the mass of the windward portion and the mass of the balancing mass body satisfy the following relationship: m1≤0.01×m2; wherein m1 is the mass of the windward portion, and m2 is the mass of the balancing mass body.

[0017] According to a second aspect of an embodiment of the present invention, there is provided a motor rotor, comprising: a rotor core; and a balancing block as described in any one of the above disclosed embodiments, arranged on an end surface of the rotor core.

[0018] According to a third aspect of an embodiment of the present invention, a compressor is provided, comprising a motor rotor as described in the above disclosed embodiment.

[0019] The balancing block for a motor rotor, the motor rotor, and the compressor provided in the embodiments of the present disclosure can achieve the following technical effects:

[0020] The balancing block body and the windward portion are arranged in sequence along the rotation direction of the balancing block body, so that the windward portion is placed in front of the windward surface of the balancing block body. The windward portion can be used to guide the refrigerant fluid, so that the refrigerant flow field changes, thereby adjusting the pressure distribution and reducing the resistance encountered by the windward surface during movement. The windward area of ​​the windward portion is smaller than the windward area of ​​the windward surface, that is, the projected area of ​​the windward portion on a plane perpendicular to the rotation direction of the balancing block body is smaller than the projected area of ​​the windward surface on a plane perpendicular to the rotation direction of the balancing block body. During the rotation of the balancing block, the windward portion with a smaller windward area contacts the refrigerant fluid first, which can effectively reduce the contact area between the balancing block and the refrigerant fluid, thereby reducing the pressure difference resistance borne by the balancing block and improving the stability of the compressor operation.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a structural schematic diagram of a balancing weight for a motor rotor provided by an embodiment of the present disclosure, wherein the direction indicated by the arrow is the rotation direction of the balancing weight body;

[0024] Figure 2 is a schematic structural diagram of another balancing block for a motor rotor provided by an embodiment of the present disclosure;

[0025] Figure 3 is a schematic structural diagram of another balancing block for a motor rotor provided by an embodiment of the present disclosure;

[0026] Figure 4 is a schematic structural diagram of another balancing block for a motor rotor provided by an embodiment of the present disclosure;

[0027] Figure 5 is a schematic structural diagram of another balancing block for a motor rotor provided by an embodiment of the present disclosure;

[0028] Figure 6is a schematic structural diagram of another balancing block for a motor rotor provided by an embodiment of the present disclosure;

[0029] Figure 7 It is a comparison curve diagram of the pressure difference resistance simulation data of the balancing block for the motor rotor provided in the embodiment of the present disclosure.

[0030] Reference numerals:

[0031] 10: Balance block;

[0032] 20: balancing block body; 21: windward surface; 22: middle section; 23: intersection line between the middle section and the windward surface;

[0033] 30: windward part; 31: windward body; 32: connecting body. DETAILED DESCRIPTION

[0034] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0035] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate for the disclosed embodiments described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0038] Unless otherwise stated, the term "plurality" means two or more.

[0039] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0040] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0042] At present, in rotary compressors, the eccentric part of the crankshaft and the roller have eccentric weights. Usually, balancing blocks are set on the upper and lower end faces of the motor rotor to balance the eccentric weights, which can achieve static and dynamic balance and reduce the vibration and noise level of the compressor. As the speed of the compressor motor rotor increases, the relative rotation speed of the balancing block and the high-temperature and high-pressure refrigerant in the compressor's internal environment also increases.

[0043] According to the general calculation formula of wind resistance (Fw):

[0044] Fw=1 / 2ρ×A×Cw×V^2,

[0045] Among them, Fw is wind resistance, ρ is medium density, A is windward cross-sectional area, Cw is drag coefficient, and V is rotation speed.

[0046] From the above formula, it can be seen that under the conditions of the same medium density ρ, windward cross-sectional area A and resistance coefficient Cw, the wind resistance Fw is proportional to the square of the speed, that is, the wind resistance of the windward surface of the balance block increases in square order with the increase of the speed. At the same time, due to the friction on the surface of the balance block, the refrigerant flows through the leeward side of the balance block to form a low-pressure area. The combination of the two produces a greater pressure difference resistance, which not only affects the stability of the compressor rotor operation, but also increases the power consumption of the compressor.

[0047] Related art discloses a rotor balancing block for a compressor, the rotor balancing block comprising a balancing block body and a windward end, the balancing block body having an inner arc surface and an outer arc surface coaxially arranged, and an inner surface and an outer surface arranged oppositely; the inner arc surface and the outer arc surface are connected between the inner surface and the outer surface; the windward end is formed at the first end of the circumference of the balancing block body, the windward end having an inner side flow dividing surface connected to the inner arc surface, and an outer side flow dividing surface connected to the outer arc surface, the inner side flow dividing surface and the outer side flow dividing surface intersecting at an edge parallel to the axis of the inner arc surface, which can reduce the resistance of the rotor rotation to a certain extent. Since the inner side flow dividing surface and the outer side flow dividing surface of the windward end intersect at an edge parallel to the axis of the inner arc surface, when the refrigerant flows along the inner side flow dividing surface and the outer side flow dividing surface, the windward end will still cause a large interference to the refrigerant flow, thereby affecting the stability of the compressor rotor operation.

[0048] Combination Figure 1-6 As shown, the embodiment of the present disclosure provides a balancing weight 10 for a motor rotor, including a balancing weight body 20 and a windward portion 30 .

[0049] One end face of the balancing block body 20 along the circumferential direction is the windward surface 21; the windward portion 30 is arranged on the windward surface 21, and the balancing block body 20 and the windward portion 30 are arranged in sequence along the rotation direction of the balancing block body 20; wherein, the windward area of ​​the windward portion 30 is smaller than the windward area of ​​the windward surface 21.

[0050] The rotation direction of the balancing weight body 20 is as follows: Figure 1 The windward surface 21 refers to the end surface of the balancing block body 20 facing the refrigerant fluid. During the rotation of the balancing block body 20, the windward surface 21 is in direct contact with the refrigerant fluid.

[0051] The windward area of ​​the windward portion 30 is the projection area of ​​the windward portion 30 on a plane perpendicular to the rotation direction of the balancing weight body 20. The windward area of ​​the windward surface 21 is the projection area of ​​the windward surface 21 on a plane perpendicular to the rotation direction of the balancing weight body 20.

[0052] The windward area of ​​the windward portion 30 is smaller than the windward area of ​​the windward surface 21, that is, the projected area of ​​the windward portion 30 on the plane perpendicular to the rotation direction of the balancing block body 20 is smaller than the projected area of ​​the windward surface 21 on the plane perpendicular to the rotation direction of the balancing block body 20. Along the rotation direction of the balancing block body 20, each cross-sectional area of ​​the windward portion 30 perpendicular to the rotation direction of the balancing block body 20 is smaller than the projected area of ​​the windward surface 21 on the plane perpendicular to the rotation direction of the balancing block body 20.

[0053] The balancing block body 20 and the windward portion 30 are sequentially arranged along the rotation direction of the balancing block body 20, so that the windward portion 30 is placed in front of the windward surface 21 of the balancing block body 20. When the balancing block body 20 rotates, the windward portion 30 first contacts the refrigerant fluid, playing a role of breaking the wind. When the refrigerant flows through the windward portion 30 with a smaller windward area, a diversion will occur, the flow state of the refrigerant changes, and the rear side of the diversion of the windward portion 30 is in a low pressure state, which can reduce the pressure on the windward surface 21.

[0054] When the compressor motor rotor rotates at high speed, the refrigerant fluid is compressed at high speed on the end surface of the windward portion 30 to form a high-pressure area, and is diverted from the windward portion 30 to form a conical flow field, reducing the pressure in the area around the windward surface 21, thereby reducing the airflow resistance of the windward surface 21. Since the windward area of ​​the windward portion 30 is relatively small, while the windward area of ​​the windward surface 21 is relatively large, as the pressure distribution is adjusted, the pressure difference resistance effect formed during the high-speed operation of the balance block 10 can be generally weakened, thereby improving the stability of the compressor operation.

[0055] Using the balancing block 10 for a motor rotor provided by the embodiment of the present disclosure, the balancing block main body 20 and the windward portion 30 are sequentially arranged along the rotation direction of the balancing block main body 20, so that the windward portion 30 is placed in front of the windward surface 21 of the balancing block main body 20. The windward portion 30 can be used to guide the refrigerant fluid, so that the refrigerant flow field changes, thereby adjusting the pressure distribution and reducing the resistance encountered by the windward surface 21 during movement. The windward area of ​​the windward portion 30 is smaller than the windward area of ​​the windward surface 21. During the rotation of the balancing block 10, the windward portion 30 with a smaller windward area first contacts the refrigerant fluid. In this way, the area of ​​direct impact between the balancing block 10 and the refrigerant fluid can be effectively reduced, thereby reducing the pressure difference resistance generated by the airflow on the balancing block 10 and improving the stability of the compressor operation.

[0056] The present application does not limit the shape of the balancing block body 20 . The balancing block body 20 may be a fan ring body, and the windward portion 30 is disposed on the circumferential end surface of the fan ring body.

[0057] When the balancing block body 20 is a fan ring body, the projection area of ​​the windward portion 30 on the plane perpendicular to the rotation direction of the balancing block body 20 is the radial cross-sectional area of ​​the windward portion 30 along the balancing block body 20. The projection area of ​​the windward surface 21 on the plane perpendicular to the rotation direction of the balancing block body 20 is the radial cross-sectional area of ​​the windward surface 21 along the radial cross-sectional area of ​​the balancing block body 20. Figure 2 The X-axis direction is shown.

[0058] Optionally, combined Figure 1-3As shown, the windward portion 30 includes a connecting body 32 and a windward body 31, one end of the connecting body 32 is connected to the windward surface 21 and extends outward from the windward surface 21; the windward body 31 is connected to the other end of the connecting body 32, the windward body 31 is a first distance away from the windward surface 21, and the side of the windward body 31 facing away from the connecting body 32 serves as the windward side of the windward portion 30.

[0059] The windward body 31 is at a first distance from the windward surface 21 . In some embodiments, the first distance is the same as the length of the connecting body 32 .

[0060] The connecting body 32 is connected between the windward surface 21 and the windward body 31, and the length of the connecting body 32 enables the windward body 31 to move forward relative to the windward surface 21. The setting of the windward body 31 can guide the refrigerant fluid and reduce the pressure of the refrigerant fluid directly impacting the balance block body 20. The setting of the connecting body 32 provides the necessary spacing between the windward body 31 and the windward surface 21, which can increase the diversion space and optimize the airflow path. The spacing formed by the connecting body 32 between the windward body 31 and the windward surface 21 can prevent the diverted refrigerant fluid from directly impacting the windward surface 21, thereby reducing the resistance and vibration of the airflow to the balance block 10.

[0061] When the compressor motor rotor rotates at high speed, the refrigerant fluid is compressed at high speed on the end face of the front windward body 31 to form a high-pressure area, and is diverted from the windward body 31 to form a conical flow field, thereby reducing the pressure in the area around the windward surface 21, thereby reducing the airflow resistance of the windward surface 21.

[0062] Optionally, the connecting body 32 extends tangentially to the rotation direction of the balancing weight body 20 .

[0063] The tangent direction of the rotation direction of the balancing weight body 20 is as follows: Figure 2 The connecting body 32 extends tangentially along the rotation direction of the balancing block body 20 , and can fully utilize the length of the connecting body to increase the distance between the windward body 31 and the windward surface 21 , thereby adjusting the shape of the refrigerant flow field and reducing the resistance of the windward surface 21 .

[0064] Optionally, combined Figure 1 As shown, the connector 32 is connected to a first position of the windward surface 21 , and the first position is located at an intersection line 23 between a radial middle section 22 of the balancing weight body 20 and the windward surface.

[0065] like Figure 1 As shown, the middle section 22 of the balancing weight body 20 in the radial direction is located at the center of the balancing weight 10 in the radial direction and extends along the circumference of the balancing weight body 20. The middle section 22 can divide the balancing weight body 20 into two symmetrical parts in the radial direction.

[0066] The radial direction of the balancing weight body 20 is as follows: Figure 2The first position is the position of the connector 32 relative to the windward surface 21 along the radial direction of the balancing weight body 20 .

[0067] The connector 32 is connected to the intersection line 23 of the radial middle section and the windward surface of the balancing block body 20, so that the connector 32 can be located at the radial center of the balancing block body 20. In this way, the windward body 31 provided on the connector 32 is also located at the radial center of the balancing block body 20, which can more effectively guide the refrigerant fluid and reduce the direct impact of the fluid on the windward surface 21, thereby reducing the pressure and vibration caused by the impact of the airflow. At the same time, this can also optimize the mass distribution of the balancing block 10, reduce the unbalanced force and moment caused by uneven mass distribution, and thus achieve more efficient dynamic balancing.

[0068] Optionally, combined Figure 2 As shown, the connecting body 32 is connected to the second position of the windward surface, and the second position is located at 1 / 3 to 2 / 3 of the height of the balancing weight body 20.

[0069] The axial direction of the balancing weight body 20 is as follows: Figure 2 As shown in the Z-axis direction, the height of the balancing block body 20 is as follows: Figure 2 The second position is the position of the connector 32 relative to the windward surface 21 along the axial direction of the balancing weight body 20 .

[0070] The height direction of the balancing block body 20 is the same as the axial direction of the balancing block body 20. The connector 32 is connected to the balancing block body 20 at 1 / 3 to 2 / 3 of the height direction, so that the connector 32 can be located in the middle area of ​​the balancing block body 20 along the axial direction. In this way, the windward body 31 provided on the connector 32 is also located in the middle area of ​​the axial direction of the balancing block body 20, which can more effectively guide the airflow and reduce the impact of the airflow on the windward surface 21, thereby reducing the resistance. This design can also improve the stability and rigidity of the overall structure of the balancing block 10 and reduce the vibration and deformation caused by high-speed rotation.

[0071] It can be understood that the second position can be located at 1 / 3, 2 / 5, 1 / 2 or 2 / 3 of the height of the balancing weight body 20.

[0072] This application takes the example that the connector 32 is located at the intersection line 23 of the radial mid-section of the balancing block body 20 and the windward surface, and the connector 32 is located at 1 / 3 to 2 / 3 of the height direction of the balancing block body 20.

[0073] In this way, the connector 32 can be located at the radial center of the balancing block body 20 and at the middle area of ​​the balancing block body 20 along the axial direction. This design can better realize the diversion of the refrigerant fluid by the windward body 31 and effectively reduce the resistance of the windward surface 21.

[0074] The present application does not limit the shape of the connector 32, and takes the connector 32 as a cylinder as an example for explanation. The two end faces of the connector 32 along the axial direction of the cylinder are respectively the first end face and the second end face, the first end face is connected to the windward surface 21, and the second end face is connected to the windward body 31. The connector 32 is arranged at the intersection line 23 of the radial middle section of the balance block body 20 and the windward surface, that is, the center of the first end face is located at the intersection line 23 of the radial middle section of the balance block body 20 and the windward surface. The connector 32 is arranged at 1 / 3 to 2 / 3 of the height of the balance block body 20, that is, the center of one end face is located at 1 / 3 to 2 / 3 of the height of the balance block body 20.

[0075] Optionally, combined Figure 1 and Figure 3 As shown, the cross-sectional area of ​​the connecting body 32 is smaller than or equal to the windward area of ​​the windward body 31 .

[0076] The cross-sectional area of ​​the connector 32 is the projection area of ​​the connector 32 on a plane perpendicular to the rotation direction of the balancing block body 20. The windward area of ​​the windward body 31 is the projection area of ​​the windward body 31 on a plane perpendicular to the rotation direction of the balancing block body 20. The cross-sectional area of ​​the connector 32 is less than or equal to the windward area of ​​the windward body 31, which can avoid the refrigerant fluid after being diverted by the windward body 31 from impacting the connector 32. Such a design can reduce the overall resistance, achieve smoother and more efficient airflow, reduce energy loss, and thus improve the energy efficiency of the compressor.

[0077] It can be understood that, since the windward area of ​​the windward portion 30 is smaller than the windward area of ​​the windward surface 21, the windward area of ​​the windward body 31 is smaller than the windward area of ​​the windward surface 21. The windward area of ​​the windward body 31 is smaller than the windward area of ​​the windward surface 21, which can prevent the refrigerant fluid after being diverted by the windward body 31 from impacting the windward surface 21.

[0078] Optionally, combined Figure 2 As shown, the length of the connector 32 and the maximum length dimension of the projection of the windward surface 21 on the plane perpendicular to the rotation direction of the balance block body 20 satisfy the following relationship: D≤L≤2D; wherein L is the length of the connector 32, and D is the maximum length dimension of the projection of the windward surface 21 on the plane perpendicular to the rotation direction of the balance block body 20.

[0079] The length of the connector 32 is Figure 2 As shown in FIG. 1 , the length L of the connector 32 is consistent with the first distance. The refrigerant fluid is diverted from the windward body 31 to form a conical flow field. The connector 32 is connected between the windward body 31 and the windward surface 21. By changing the length of the connector 32, the relative position relationship between the refrigerant conical flow field and the windward surface 21 can be changed.

[0080] D is the maximum length dimension of the projection of the windward surface 21 on the plane perpendicular to the rotation direction of the balancing weight body 20. Figure 2 As shown, the windward surface 21 is a quadrilateral, and the side length of the windward surface 21 along the radial direction of the balance weight body 20 is greater than the side length of the windward surface 21 along the axial direction of the balance weight body 20. At this time, the side length of the windward surface 21 along the radial direction of the balance weight body 20 is the maximum length dimension D of the projection of the windward surface 21 along the rotation direction of the balance weight body 20. In some embodiments, D can also be the side length of the windward surface 21 along the axial direction of the balance weight body 20. In some embodiments, the windward surface 21 can also be other shapes.

[0081] The length L of the connector 32 affects the flow path and speed of the refrigerant fluid. When L is greater than or equal to D, the distance between the windward body 31 and the windward surface 21 is increased, and the flow distance of the refrigerant fluid after diversion is increased, thereby providing the refrigerant fluid with more time to expand, which helps the refrigerant to form a low-pressure area near the windward surface 21.

[0082] D≤L≤2D, that is, L=(1~2)×D. When the length L of the connector 32 is 1 to 2 times the maximum length dimension D of the projection of the windward surface 21 along the rotation direction of the balancing block body 20, the refrigerant fluid can flow more effectively around the windward surface 21 after being diverted by the windward body 31, avoiding direct impact of the refrigerant fluid on the windward surface 21, thereby reducing the resistance of the windward surface 21. Such a design enables the connector 32 to maintain high efficiency operation of the compressor while providing sufficient strength and stability.

[0083] It is understood that L can be D, 1.2D, 1.5D, 1.8D, 2D, and so on.

[0084] Optionally, combined Figure 1 and Figure 3 As shown, the windward area of ​​the windward body 31 and the windward area of ​​the windward surface 21 satisfy the following relationship: 8%×s2≤s1≤16%×s2; wherein s1 is the windward area of ​​the windward body 31, and s2 is the windward area of ​​the windward surface 21.

[0085] 8%×s2≤s1≤16%×s2, that is, s1=(8%~16%)×s2.

[0086] When s1 is greater than or equal to 8% of s2, the refrigerant fluid can be fully expanded into a conical flow that can surround the windward surface 21 after diversion, thereby forming a low-pressure area near the windward surface 21 and reducing the resistance of the windward surface 21.

[0087] When s1 is less than or equal to 16% of s2, the flow velocity of the refrigerant after diversion can be increased, which helps to form a high-speed fluid, thereby forming a low-pressure area near the windward surface 21. At the same time, the stability of the fluid flow can also be improved.

[0088] The embodiment of the present disclosure limits the windward area s1 of the windward body 31 to 8% to 16% of the windward area s2 of the windward surface 21, which can optimize the influence of the balancing block 10 on the refrigerant airflow and reduce the impact of the refrigerant airflow on the balancing block 10. In this way, a low-pressure area can be formed near the windward surface 21, thereby reducing the noise and vibration caused by airflow disturbance, while maintaining the efficient operation of the compressor.

[0089] The present application enables the refrigerant flow field to be fully expanded by reasonably setting the length L of the connecting body 32 and the windward area of ​​the windward body 31 , so that the diverted high-speed refrigerant forms a low-pressure area in the vicinity of the windward surface 21 .

[0090] Optionally, the windward side of the windward body 31 is in the shape of a disk, a hemisphere or a cone.

[0091] Combination Figure 4 As shown, when the windward side of the windward body 31 is in the shape of a disk, a circular end surface of the disk is arranged away from the balancing block body 20 along the rotation direction of the balancing block body 20. Figure 5 As shown, when the windward side of the windward body 31 is hemispherical, the arc-shaped outer surface of the hemisphere is arranged away from the balancing block body 20 along the rotation direction of the balancing block body 20. Figure 6 As shown, when the windward side of the windward body 31 is conical, the apex and side surfaces of the cone are arranged away from the balancing weight body 20 along the rotation direction of the balancing weight body 20 .

[0092] The disc-shaped, hemispherical or conical windward body 31 helps to optimize the guidance and dispersion of the refrigerant airflow, reduce resistance and vibration, and improve the performance and stability of the compressor.

[0093] Optionally, the mass of the windward portion 30 and the mass of the balancing block body 20 satisfy the following relationship: m1≤0.01×m2; wherein m1 is the mass of the windward portion 30 , and m2 is the mass of the balancing block body 20 .

[0094] The mass m1 of the windward portion 30 includes the masses of the windward body 31 and the connecting body 32 .

[0095] The windward portion 30 is disposed on the windward surface 21 of the balancing block body 20, and the windward portion 30 is located at the end of the balancing block 10. The mass m1 of the windward portion 30 is less than or equal to 0.01 times the mass m2 of the balancing block body 20, which can prevent the balancing block 10 from being overweight, thereby maintaining the dynamic balance and static balance of the balancing block 10. In this way, the balancing block 10 can provide the necessary balancing effect without excessively increasing the load on the motor rotor.

[0096] With ideal gas as the medium, the relative speed between the balance block 10 and the ideal gas is 20 m / s 2For example, fluid dynamics simulation calculations are performed on the balancing block 10 with the windward body 31 being a disk, a cone, and a hemispherical shape, respectively, where L=1.5×D, h=D, s1=9.72%×s2, and m1=0.01×m2. Fluid dynamics simulation calculations are also performed on the conventional balancing block without the windward portion 30. Part of the simulation calculation data is shown in Table 1.

[0097] Table 1

[0098]

[0099] Combining Table 1 and Figure 7 The convergence results of the CFD simulation iteration calculation show that with the increase of the iteration number, the pressure difference resistance of the conventional balance block without the windward portion 30 tends to 6.425×10 -2 N. As the number of iterations increases, the pressure difference resistance of the balancing block 1 with the disc-shaped windward body 31 tends to 5.988×10 -2 N, and its pressure difference resistance is reduced by 6.8% compared with the conventional balance block. As the number of iteration steps increases, the pressure difference resistance of the balance block 2 with the conical windward body 31 tends to 5.979×10 -2 N, and its pressure difference resistance is reduced by 6.95% compared with the conventional balance block. As the number of iteration steps increases, the pressure difference resistance of the balance block 3 with the hemispherical windward body 31 tends to 6.089×10 -2 N, its pressure difference resistance is reduced by 5.23% compared with the conventional balancing block. It can be seen that the windward portion 30 is placed in front of the windward surface 21 of the balancing block body 20, which can effectively reduce the pressure difference resistance. Moreover, under the same conditions, the balancing block 1 with a disc-shaped windward body 31 and the balancing block 2 with a conical windward body 31 can more effectively reduce the pressure difference resistance of the balancing block 10.

[0100] The embodiment of the present disclosure provides a motor rotor, comprising a rotor core and a balancing block 10 as described in any one of the above disclosed embodiments, wherein the balancing block 10 is arranged on the end surface of the rotor core.

[0101] The motor rotor provided by the embodiment of the present disclosure includes the balancing weight 10 for the motor rotor described in any one of the above disclosed embodiments, and thus has all the beneficial effects of the balancing weight 10 for the motor rotor described in any one of the above disclosed embodiments, which will not be repeated here.

[0102] Optionally, the rotor core includes a first end face and a second end face along the axial direction, and the balancing weight 10 is arranged on the first end face and / or the second end face.

[0103] The balancing weight 10 provided in the above disclosed embodiment can be arranged on the first end surface, can be arranged on the second end surface, or can be arranged on both the first end surface and the second end surface. The balancing weight 10 provided in the above disclosed embodiment is arranged on both the first end surface and the second end surface, which can effectively reduce the pressure difference resistance of the balancing weight 10 and improve the working efficiency of the motor rotor.

[0104] An embodiment of the present disclosure provides a compressor, comprising a motor rotor as described in the above disclosed embodiment.

[0105] The compressor provided by the embodiment of the present disclosure includes the motor rotor described in the above disclosed embodiment, and thus has the beneficial effects of the motor rotor described in the above disclosed embodiment, which will not be described in detail here.

[0106] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A balancing weight for a motor rotor, characterized in that: include: The balancing block body has one end surface along the circumferential direction as the windward surface; The windward portion is arranged on the windward surface, and the balancing block body and the windward portion are arranged in sequence along the rotation direction of the balancing block body; Among them, the windward area of ​​the windward part is smaller than the windward area of ​​the windward surface.

2. The balancing weight according to claim 1, characterized in that: The windward section includes: A connector, one end of which is connected to the windward surface and extends outward from the windward surface; The windward body is connected to the other end of the connecting body, the windward body is a first distance away from the windward surface, and the side of the windward body facing away from the connecting body serves as the windward side of the windward portion.

3. The balancing weight according to claim 2, characterized in that: The connecting body is connected to a first position of the windward surface, and the first position is located at an intersection line between a radial mid-section of the balancing block body and the windward surface; and / or, The connecting body is connected to a second position of the windward surface, and the second position is located at 1 / 3 to 2 / 3 of the height direction of the balancing block body.

4. The balancing weight according to claim 2, characterized in that: The cross-sectional area of ​​the connecting body is less than or equal to the windward area of ​​the windward body.

5. The balancing weight according to claim 2, characterized in that: The length of the connector and the maximum length of the projection of the windward surface on the plane perpendicular to the rotation direction of the balancing block body satisfy the following relationship: D≤L≤2D; Wherein, L is the length of the connector, and D is the maximum length dimension of the projection of the windward surface on the plane perpendicular to the rotation direction of the balancing block body.

6. The balancing weight according to claim 2, characterized in that: The windward area of ​​the windward body and the windward area of ​​the windward surface satisfy the following relationship: 8%×s2≤s1≤16%×s2; Among them, s1 is the windward area of ​​the windward body, and s2 is the windward area of ​​the windward surface.

7. The balancing weight according to claim 2, characterized in that: The windward side of the windward body is in the shape of a disk, a hemisphere or a cone.

8. The balancing weight according to any one of claims 1 to 7, characterized in that: The mass of the windward part and the mass of the balance block body satisfy the following relationship: m1≤0.01×m2; Among them, m1 is the mass of the windward part, and m2 is the mass of the balance block body.

9. A motor rotor, characterized in that: include: Rotor core; The balancing weight according to any one of claims 1 to 8 is arranged on the end surface of the rotor core.

10. A compressor, characterized in that: Comprising the motor rotor as claimed in claim 9.

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