A compressor and its motor and rotor balancing block

Abstract

The present invention discloses a compressor and its motor and rotor balancing block, wherein the rotor balancing block comprises: a base plate, the base plate is an annular structure; a boss, the boss is mounted on the outer annular surface of the annular structure; a fluid passage, the fluid passage passes through the annular wall of the annular structure, and / or the fluid passage passes through the boss; the extension direction of the fluid passage is the same as the rotor rotation direction of the motor. The rotor balancing block provided by the present invention is provided with a fluid passage on the base plate and / or the step, the fluid passage is the same as the rotor rotation direction, that is, the path of the fluid passage is similar to a centrifugal line, when the cooling oil flows in the motor, the design of the fluid passage can significantly speed up the cooling oil flow speed, thereby greatly improving the cooling oil reflux speed, maintaining sufficient oil in the oil pool, and thus ensuring the compressor lubrication effect and operation reliability.

Description

Technical Field

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

[0002] When a rotary variable frequency compressor is operating, cooling oil flows from the oil pool at the bottom of the compressor through the compressor pump body, is drawn in, compressed, and discharged through the exhaust port. It then flows through the flow holes on the rotor to the upper chamber of the compressor. After oil and gas separation is completed through the compressor's oil retaining components, it splashes onto the inner wall of the compressor housing, flows back through the stator flow holes and trimmings to the bottom of the oil pool, and enters the next oil circuit. The return rate of the cooling oil affects the oil volume in the compressor oil pool, playing a key role in lubricating the high-speed crankshaft, rollers, and related components. If the oil pool is insufficient, it can easily cause dry grinding of moving parts, leading to compressor jamming or a sharp increase in power consumption, a decrease in compressor performance, and a significant impact on the compressor's operational stability and reliability.

[0003] In the prior art, the balance block on the rotor assembly of the compressor motor is arranged inside the oil deflector cap, and the bottom surface of the oil deflector cap is close to the baffle. The oil deflector cap can only perform oil and gas separation once, the separation efficiency is low, and the oil discharge rate of the compressor is high, resulting in poor energy efficiency of the air conditioner; at the same time, the oil deflector cap is a regular cylindrical surface on the vertical plane, and has no good guiding effect on the flow direction of the cooling oil. The cooling oil flow is messy and the reflux speed is slow, resulting in insufficient oil in the compressor oil pool, aggravated wear of the compressor pump body parts, high power consumption or jamming of the compressor, and poor operating reliability.

[0004] In addition, in the existing technology, the cross-sectional area of ​​the gap between the stator teeth and the coil of the compressor motor is small, the utilization rate as a cooling oil return channel is low, the cooling oil flows in a disorderly manner, there is no effective guidance, and the cooling oil return speed is slow; the cooling oil flows back to the oil pool along the inner wall of the shell, the stator winding and the stator core are not fully cooled, the stator temperature rises, resulting in high power consumption of the compressor, seriously affecting the life and performance of the compressor motor. Summary of the Invention

[0005] An object of the present invention is to provide a compressor, a motor thereof, and a rotor balancing block thereof to solve or at least partially solve at least one of the above problems.

[0006] To achieve the above purpose, the technical solutions proposed by the present invention are as follows:

[0007] A rotor balancing weight for a motor, comprising:

[0008] A bottom plate having an annular structure;

[0009] a boss, the boss being mounted on the outer annular surface of the annular structure;

[0010] A fluid passage is provided through the annular wall of the annular structure, and / or the fluid passage is provided through the boss; the extension direction of the fluid passage is the same as the rotation direction of the rotor of the motor.

[0011] The rotor balancing block provided by the present invention is provided with a fluid passage on the base plate and / or the step. The fluid passage has the same direction of rotation as the rotor, that is, the path of the fluid passage is similar to a centrifugal line. When the cooling oil flows in the motor, the design of the fluid passage can significantly accelerate the flow speed of the cooling oil, thereby greatly improving the cooling oil return speed, maintaining sufficient oil in the oil pool, and thus ensuring the lubrication effect and operation reliability of the compressor.

[0012] Furthermore, the fluid passage includes a first passage opened in the annular structure, and a second passage opened in the boss.

[0013] Furthermore, there are a plurality of first passages, and the first passages are opened on the annular wall at intervals from each other in the circumferential direction.

[0014] Furthermore, the opening of the first passage on the inner annular surface of the annular structure and the opening of the first passage on the outer annular surface of the annular structure have a difference of 15°-30° in the direction of rotation of the rotor.

[0015] Furthermore, the second passage includes at least one through hole formed on a side wall of the boss, and at least one communicating groove formed on a top surface of the boss.

[0016] Furthermore, the opening of the second passage on the inner side wall of the boss and the opening on the outer side wall of the boss differ in angle from each other by 15° to 30° in the direction of rotation of the rotor.

[0017] Furthermore, the base plate and the boss are both circular ring structures, the boss is a circular ring structure with one end open, and the axial thickness of the boss gradually decreases in the rotation direction of the rotor.

[0018] The present invention also provides a motor, comprising a stator assembly, a rotor assembly cooperating with the stator assembly, and an oil deflector cap installed on the top of the rotor assembly, wherein the rotor core of the rotor assembly is provided with a plurality of axially through-flow holes, and the motor further comprises the rotor balancing block as described above, wherein the rotor balancing block is fixedly arranged between the rotor assembly and the oil deflector cap.

[0019] Furthermore, there are two rotor balancing blocks, the end of the rotor assembly facing the oil deflector cap is the first end face, and the end away from the oil deflector cap is the second end face; one of the two rotor balancing blocks is fixed to the first end face, and the other is fixed to the second end face.

[0020] Furthermore, the number of fluid passages opened on the rotor balancing weight is an integer multiple of the number of the flow holes.

[0021] Furthermore, a through slot is provided on the stator core of the stator assembly, and the through slot is provided on the end surface of the stator core facing the stator coil.

[0022] Furthermore, the through groove is one of a square groove, an arc groove and a trapezoidal groove.

[0023] The present invention also provides a compressor comprising the motor as described above.

[0024] The advantages of the above additional aspects will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1-Figure 3 This is a structural schematic diagram of a specific embodiment of the rotor balancing weight provided by the present invention;

[0026] Figure 4 A schematic structural diagram of a specific embodiment of the motor provided by the present invention;

[0027] Figure 5 for Figure 4 A cross-sectional view of the motor shown, wherein the arrow direction in the figure indicates the direction of cooling oil flow;

[0028] Figure 6 is a schematic structural diagram of a stator assembly having square slots;

[0029] Figure 7 is a schematic structural diagram of a stator assembly having arc-shaped slots;

[0030] Figure 8 Schematic diagram of the structure of a stator assembly with trapezoidal slots.

[0031] Description of reference numerals:

[0032] 1-rotor balancing weight 11-base plate 12-boss 13-first passage 14-through hole 15-through groove

[0033] 2- stator assembly 21- stator core 22- stator winding 23- slot 24- gap

[0034] 3-Rotor assembly 31-Rotor core 32-Baffle

[0035] 4-Oil cap

[0036] 5-Crankshaft

[0037] 6-Cooling oil flow path DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] Please refer to Figure 1-Figure 3 , Figure 1-Figure 3 This is a structural schematic diagram of a specific embodiment of the rotor balancing weight provided by the present invention, wherein the direction indicated by the arrow is the communication direction of the cooling oil flow path 6.

[0040] In a specific embodiment, the rotor balancing weight 1 provided by the present invention is used for a motor, specifically a balancing weight structure arranged at both ends of a rotor assembly 3, and the rotor balancing weight 1 includes a base plate 11 and a boss 12, wherein a mounting hole is provided on the base plate 11 and is fixedly connected to the rotor assembly 3 by rivets passing through the mounting hole. The base plate 11 is an annular structure. This embodiment takes the base plate 11 in the form of a circular ring as an example. In theory, the base plate 11 can also be an elliptical ring or other annular structure that does not hinder the use function of the motor. The boss 12 is installed on the outer ring surface of the annular structure. Since the base plate 11 needs to be fixedly connected to the rotor assembly 3, in order to avoid interference with the mounting structure of the base plate 11, the boss 12 is arranged on the outer ring surface of the base plate 11 and is arranged axially higher than the base plate 11. The fluid passage is opened through the annular wall of the annular structure, and / or the fluid passage is opened through the boss 12, that is, the fluid passage can be opened only on the base plate 11, or only on the boss 12. The preferred solution is to open it on both the base plate 11 and the boss 12; the extension direction of the fluid passage is the same as the rotation direction of the rotor of the motor.

[0041] The rotor balancing weight 1 is provided with a fluid passage on the base plate 11 and / or the step. The fluid passage has the same direction of rotation as the rotor, that is, the path of the fluid passage is similar to a centrifugal line. When the cooling oil flows in the motor, the design of the fluid passage can significantly accelerate the flow speed of the cooling oil, thereby greatly improving the cooling oil return speed, maintaining sufficient oil in the oil pool, and thus ensuring the lubrication effect and operation reliability of the compressor.

[0042] To ensure smooth circulation and the cooling oil return speed and amount, fluid passages can be simultaneously provided on the base plate 11 and the boss 12. Specifically, the fluid passages include a first passage 13 provided in the annular structure and a second passage provided in the boss 12. Multiple first passages 13 are provided on the base plate 11, and each of the first passages 13 is provided on the annular wall at intervals in the circumferential direction. For multiple first passages 13, the extension direction of each first passage 13 can be the same or slightly angled, and the extension path of the first passage 13 can be a straight line, a curve, or a broken line. The cross-section of the first passage 13 can be circular, square, elliptical, or other shapes.

[0043] Specifically, the opening of the first passage 13 on the inner annular surface of the annular structure and the opening on the outer annular surface of the annular structure are oriented 15-30 degrees apart in the direction of rotor rotation, thereby better aligning with the rotor's rotational direction and improving the smooth flow of cooling oil. The opening of the first passage 13 is vertically aligned with the flow holes of the rotor core 31 to ensure the continuity of the cooling oil path.

[0044] The above-mentioned base plate 11 is a circular ring structure, and the boss 12 is a circular ring structure with one end open. In the direction of rotor rotation, the axial thickness of the boss 12 gradually decreases. The base plate 11 and the boss 12 form a step shape, and the step height decreases smoothly along the direction of rotor rotation (the rotor rotation direction is generally clockwise). The axial thickness of the boss 12 is the step height. Among them, the highest point of the boss 12 is 3-5 mm higher than its lowest point to ensure a better oil-gas separation effect.

[0045] Furthermore, the second passage includes at least one through hole 14 formed in the side wall of the boss 12 and at least one connecting groove formed in the top surface of the boss 12. Multiple through holes 14 and connecting grooves may be provided, and the through holes 14 may be circular, elliptical, or other forms. The height of the through holes 14 corresponds to the height of the gap 24 between the stator coil 22 and the stator core 21 for quality inspection, to ensure that the cooling oil after separation has good guidance properties. Each through hole 14 is formed in the side wall of the boss 12 and passes through the inner and outer annular surfaces of the boss 12. The extension direction of the through hole 14 may be a straight line, a curve, or a broken line. Each connecting groove is formed in the top surface of the boss 12 and may be an arcuate groove, a square groove, or a trapezoidal groove, and the extension direction of the connecting groove may also be a straight line, a curve, or a broken line.

[0046] Specifically, the opening of the second passage on the inner wall of the boss 12 and the opening on the outer wall of the boss 12 have a difference of 15°-30° in the rotor rotation direction, so as to better adapt to the rotor rotation direction, thereby improving the circulation smoothness of the cooling oil.

[0047] In addition to the above-mentioned rotor balancing weight 1, the present invention also provides a motor including the rotor balancing weight 1, which is specifically a motor of an air-conditioning compressor. In a specific embodiment, as shown in FIG. Figure 4 and Figure 5 As shown, the motor includes a crankshaft 5, a stator assembly 2, a rotor assembly 3 matched with the stator assembly 2, and an oil deflector cap 4 installed on the top of the rotor assembly 3. The stator assembly 2 includes a stator core 21 and a stator winding 22 arranged at both ends of the stator core 21. There is a gap 24 between the stator core 21 and the stator winding 22 for cooling oil to pass through. The rotor assembly 3 is sleeved in the stator assembly 2 and can rotate around the stator assembly 2. The rotor assembly 3 includes a rotor core 31 and baffles 32 installed at both ends of the stator core 21. The rotor core 31 of the rotor assembly 3 is provided with a plurality of axially through-flow holes. The motor also includes the rotor balancing weight 1 as described above. The rotor balancing weight 1 is fixedly arranged between the rotor assembly 3 and the oil deflector cap 4. The rotor balancing weight 1 is independent of the oil deflector cap 4 and is arranged below the oil deflector cap 4 to facilitate the flow of cooling oil.

[0048] The rotor balancing weights 1 are two in number. The end of the rotor assembly 3 facing the oil deflector cap 4 is a first end face, and the end away from the oil deflector cap 4 is a second end face. One of the two rotor balancing weights 1 is fixed to the first end face, and the other is fixed to the second end face. The rotor balancing weights 1 are arranged in the form of a primary and secondary balancing weight. The two balancing weights have the same structure and are assembled symmetrically in a spatial direction of 180° to meet the balance coefficient requirements.

[0049] In this specific embodiment, the number of fluid passages opened on the rotor balancing weight 1 is an integer multiple of the number of the through-holes, for example, it can be 1 times, 2 times or 3 times.

[0050] Furthermore, the stator core 21 of the stator assembly 2 is provided with a through slot, which is provided on the end surface of the stator core 21 facing the stator coil 22. Specifically, the through slot is provided in the circumferential direction of the upper and lower end teeth of the stator core 21. The through slot is as wide as possible, with a spacing of at least 1 mm between the slot edge and a single side of the stator tooth. The through slot depth is preferably less than 3 mm to avoid adverse effects on the stator magnetic circuit.

[0051] like Figure 6-Figure 8 As shown, the through groove can be specifically one of a square groove, an arc groove and a trapezoidal groove.

[0052] The present invention also provides a compressor comprising the above motor, and the compressor is specifically an air-conditioning compressor.

[0053] In summary, in the above specific embodiments, the compressor, its motor, and rotor balancing weight 1 provided by the present invention have the following advantages:

[0054] 1. The fluid passages provided on the base plate 11 and the boss 12 of the rotor balancing block 1 can effectively guide the cooling oil to quickly fling it toward the gap between the stator core 21 and the winding. The centrifugal path of the through hole 14 in the same direction of rotor rotation can significantly accelerate the flow speed of the cooling oil, greatly improve the cooling oil return speed, maintain sufficient oil in the oil pool, and ensure the lubrication effect and operational reliability of the compressor.

[0055] 2. The upper and lower end teeth of the stator core 21 are provided with through slots, which further increase the cross-sectional area of ​​the gap 24 between the stator core 21 and the winding. The cooling oil guided by the balancing block quickly flows back to the oil pool through the gap 24, ensuring the oil volume in the oil pool and the balance and stability of the compressor oil circuit system.

[0056] 3. The rotor balancing weight 1 is located below the exterior of the oil deflector cap 4 and features a stepped design. The height of the balancing weight step gradually decreases along the direction of rotor rotation. This structure enhances the disturbance of the oil-gas mixture and completes the primary separation. Combined with the secondary separation provided by the upper oil deflector cap 4, this improves separation efficiency and accelerates the oil-gas separation speed. The inner diameter of the step is larger than the outer diameter, further enhancing the guidance of the cooling oil flow.

[0057] 4. After the cooling oil flows through the surface of the winding, it returns through the gap between the stator core 21 and the winding, effectively reducing the temperature of the winding and the stator core 21, reducing the stator temperature rise, and significantly improving the motor life and compressor reliability.

[0058] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation on the present invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0060] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A rotor balancing block for a motor, characterized in that: include: A bottom plate (11), wherein the bottom plate (11) is a circular ring structure; A boss (12), the boss (12) being a circular ring structure with an open end mounted on the outer ring surface of the base plate (11); A fluid passage, wherein the fluid passage passes through an annular wall opened in the base plate (11), and the fluid passage passes through the boss (12); the extension direction of the fluid passage is the same as the rotation direction of the rotor of the motor; the fluid passage comprises a first passage (13) opened in the base plate (11), and a second passage opened in the boss (12).

2. The rotor balancing weight according to claim 1, characterized in that: There are a plurality of first passages (13), and each of the first passages (13) is opened on the annular wall at intervals from one another in the circumferential direction.

3. The rotor balancing weight according to claim 2, characterized in that: The opening of the first passage (13) on the inner annular surface of the annular structure and the opening on the outer annular surface of the annular structure differ by 15°-30° in the direction of rotation of the rotor.

4. The rotor balancing weight according to claim 1, characterized in that: The second passage comprises at least one through hole (14) formed on a side wall of the boss (12), and at least one connecting groove formed on a top surface of the boss (12).

5. The rotor balancing weight according to claim 4, characterized in that: The opening of the second passage on the inner wall of the boss (12) and the opening on the outer wall of the boss (12) differ by 15°-30° in the direction of rotation of the rotor.

6. The rotor balancing weight according to claim 1, characterized in that: In the rotation direction of the rotor, the axial thickness of the boss (12) gradually decreases.

7. A motor, comprising a stator assembly (2), a rotor assembly (3) matched with the stator assembly (2), and an oil retaining cap (4) mounted on the top of the rotor assembly (3), wherein a rotor core (31) of the rotor assembly (3) is provided with a plurality of axially penetrating flow holes; characterized in that: The motor further comprises a rotor balancing weight as claimed in any one of claims 1 to 6, wherein the rotor balancing weight is fixedly arranged between the rotor assembly (3) and the oil deflector cap (4).

8. The motor according to claim 7, characterized in that There are two rotor balancing blocks, one end of the rotor assembly (3) facing the oil deflector cap (4) is a first end face, and the other end away from the oil deflector cap (4) is a second end face; one of the two rotor balancing blocks is fixedly connected to the first end face, and the other is fixedly connected to the second end face.

9. The motor according to claim 7, characterized in that The number of fluid passages opened on the rotor balancing block is an integer multiple of the number of the through holes.

10. The motor according to claim 7, characterized in that A through slot is provided on the stator core (21) of the stator assembly (2), and the through slot is provided on the end surface of the stator core (21) facing the stator coil (22).

11. The motor according to claim 10, characterized in that The through groove is one of a square groove, an arc groove and a trapezoidal groove.

12. A compressor, characterized in that: Comprising a motor as described in any one of claims 7-11.

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