Balancing structure of a rotor, rotor assembly, motor and compressor

Abstract

The application discloses a rotor balance structure, a rotor assembly, a motor and a compressor, and relates to the technical field of rotors. The application adopts a balance structure at the upper and lower ends of the rotor, improves the dynamic balance performance during the operation of the compressor, effectively reduces the vibration of the compressor, optimizes the gas flow channel at the upper and lower ends of the rotor, improves the eddy disturbance state near the balance structure at the upper and lower ends of the motor rotor, and effectively reduces the eddy aerodynamic noise at the upper and lower ends of the motor rotor and the overall noise of the motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a rotor balancing structure and rotor assembly, motor, and compressor. Background Technology

[0002] In order to balance the pump body rotor system, rolling rotor compressors generally have balancing structures installed at the upper and lower ends of the motor rotor assembly to reduce compressor vibration caused by the imbalance of the crankshaft rotor system. However, current balancing structures are generally symmetrically designed and installed. When the compressor is running, the dynamic balance performance of the entire operating shaft system of the symmetrically designed balancing structure is poor, resulting in a poor vibration reduction effect on the compressor.

[0003] Furthermore, the periodic rotation of the motor rotor assembly during compressor operation causes alternating eddies in the gas turbulence on the rotating surface, generating eddy current aerodynamic noise. Eddy current noise is broadband, and excessively high levels of it significantly impact the overall noise level of the compressor. Gas discharged from the cylinder first enters the lower chamber of the motor, then flows upward through the rotor's flow holes to the upper chamber. The balance block structures at both ends of the rotor assembly significantly influence the gas flow in the upper and lower chambers due to the periodic rotation of the rotor. Because the balance structure is asymmetrical within its respective rotational region, the periodic eddy current noise caused by this asymmetry is even more pronounced. Summary of the Invention

[0004] In order to overcome the shortcomings of existing motor rotor assembly balance structure design, which affects the balance performance of the entire crankshaft rotor system, thereby affecting the overall vibration of the compressor, and also causes different degrees of eddy currents to be generated at the upper and lower ends of the motor rotor, affecting the overall noise of the compressor, the purpose of this invention is to provide a rotor balance structure, rotor assembly, motor, and compressor.

[0005] The technical solution adopted by this invention to solve its technical problem is: a rotor balancing structure, including an upper balancing block and a lower balancing block. The upper balancing block is installed on one end of the rotor core, and the lower balancing block is installed on the other end of the rotor core. The rotor core is connected to a crankshaft, and the crankshaft has an eccentric part. The centerline of the crankshaft and the geometric center of the eccentric part form the central plane of the crankshaft eccentric part. The geometric center of the upper balancing block and the centerline of the crankshaft form the central plane of the upper balancing block. The geometric center of the lower balancing block and the centerline of the crankshaft form the central plane of the lower balancing block. Along the rotation direction of the rotor, the central plane of the upper balancing block forms an angle α with the central plane of the crankshaft eccentric part, and along the rotation direction of the rotor, the central plane of the lower balancing block forms an angle b with the central plane of the crankshaft eccentric part.

[0006] As a further improvement of the present invention, the geometric center of the upper balance block is located on one side outside the central plane of the crankshaft eccentric part, and the geometric center of the lower balance block is located on the other side outside the central plane of the crankshaft eccentric part.

[0007] As a further improvement of the present invention, the included angle α is in the range of 0°-20°.

[0008] As a further improvement of the present invention, the included angle b is in the range of 0°-20°.

[0009] As a further improvement of the present invention, the included angle α and included angle β have different values.

[0010] As a further improvement of the present invention, the included angle α and included angle β have the same value.

[0011] As a further improvement of the present invention, the included angle a is 10° and the included angle b is 15°.

[0012] Based on the same inventive concept, the present invention also provides a rotor assembly using a rotor balancing structure as described above. One end of the rotor core is fixedly provided with an upper baffle, and the other end of the rotor core is fixedly provided with a lower baffle. Both the upper and lower balancing blocks are provided with mounting holes. The upper balancing block is mounted on the upper baffle by a fixing member, and the lower balancing block is mounted on the lower baffle by a fixing member.

[0013] Based on the same inventive concept, the present invention also provides an electric motor, characterized in that it includes a balancing structure using a rotor as described above.

[0014] Based on the same inventive concept, the present invention also provides a compressor, characterized in that it includes a balancing structure using a rotor as described above.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention improves the dynamic balance performance of the compressor during operation by adopting a balancing structure at the upper and lower ends of the rotor, effectively reducing the overall vibration of the compressor. It also optimizes the gas flow path at the upper and lower ends of the rotor for the gas discharged from the cylinder, improves the eddy current disturbance state near the balancing structure at the upper and lower ends of the motor rotor, and effectively reduces the eddy current aerodynamic noise at the upper and lower ends of the motor rotor and the overall noise of the machine. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rotor assembly of the present invention.

[0018] Figure 2 This is a top view of the rotor assembly of the present invention.

[0019] Figure 3This is a bottom view of the rotor assembly of the present invention.

[0020] Figure 4 This is a schematic diagram of the upper balancing block of the present invention.

[0021] Figure 5 This is a schematic diagram of the upper balancing block structure of the present invention.

[0022] Figure 6 This is a schematic diagram of the lower balancing block of the present invention.

[0023] Figure 7 This is a schematic diagram of the lower balancing block of the present invention.

[0024] Figure 8 This is a diagram showing the turbulent kinetic energy distribution of a rotor assembly composed of ordinary symmetrical balance blocks.

[0025] Figure 9 This is a diagram showing the turbulent kinetic energy distribution of the rotor assembly with a balance block structure according to the present invention.

[0026] Reference numerals: 1. Upper balance block; 2. Lower balance block; 101. Mounting hole of upper balance block; 201. Mounting hole of lower balance block; 3. Rotor core; 4. Upper baffle; 5. Lower baffle; 6. Crankshaft; m. Center plane of crankshaft eccentric part; n1. Center plane of upper balance block; n2. Center plane of lower balance block; a. Angle between the center plane of crankshaft eccentric part and the center plane of upper balance block; b. Angle between the center plane of crankshaft eccentric part and the center plane of lower balance block. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] To address the technical issues arising from the existing design of the balancing structure at the upper and lower ends of the motor rotor assembly, which affects the balance performance of the entire crankshaft rotor system and thus the overall vibration of the compressor, and also causes varying degrees of eddy currents at the upper and lower ends of the motor rotor, thus affecting the overall noise of the compressor, the present invention will be further described below with reference to the accompanying drawings and embodiments: Example

[0029] like Figure 1-7As shown, this embodiment discloses a rotor balancing structure, including an upper balancing block 1 and a lower balancing block 2. The upper balancing block 1 is installed on one end of the rotor core 3, and the lower balancing block 2 is installed on the other end of the rotor core 3. The rotor core 3 is connected to a crankshaft 6, and the crankshaft 6 is provided with an eccentric part. The upper balancing block 1 and the lower balancing block are structures with uniform mass distribution.

[0030] The centerline of the crankshaft 6 and the geometric center of the eccentric part constitute the central plane m of the crankshaft eccentric part. The geometric center of the upper balance block 1 and the centerline of the crankshaft 6 constitute the central plane n1 of the upper balance block. The geometric center of the lower balance block 2 and the centerline of the crankshaft 6 constitute the central plane n2 of the lower balance block. Along the rotation direction of the rotor, the central plane n1 of the upper balance block forms an angle α with respect to the central plane m of the crankshaft eccentric part. Along the rotation direction of the rotor, the central plane n2 of the lower balance block forms an angle b with respect to the central plane m of the crankshaft eccentric part.

[0031] Preferably, the geometric center of the upper balance block 1 is located on one side outside the central plane m of the crankshaft eccentric part, and the geometric center of the lower balance block 2 is located on the other side outside the central plane m of the crankshaft eccentric part.

[0032] That is, the geometric center of the upper balance block 1 and the geometric center of the lower balance block 2 are not within the center plane m of the crankshaft eccentric part.

[0033] The upper balance block 1 and the lower balance block 2 are asymmetrically designed and installed, and the center plane of the upper balance block 1 and the center plane of the lower balance block 2 are at a certain angle to the center plane of the eccentric part of the crankshaft 6. This optimizes the dynamic balance performance of the compressor during operation, effectively reduces the overall vibration of the compressor, optimizes the gas flow channel, improves the eddy current disturbance state near the upper and lower end balance structure of the motor rotor, effectively reduces the eddy current aerodynamic noise of the upper and lower chambers of the motor rotor, and improves the overall noise of the compressor.

[0034] Preferably, the included angle b and included angle a are both in the range of 0°-20°. Example

[0035] like Figures 1-7 As shown, this embodiment discloses a rotor balancing structure, including an upper balancing block 1 and a lower balancing block 2. The upper balancing block 1 is installed on one end of the rotor core 3, and the lower balancing block 2 is installed on the other end of the rotor core 3. The rotor core 3 is connected to a crankshaft 6, and the crankshaft 6 is provided with an eccentric part. The upper balancing block 1 and the lower balancing block are structures with uniform mass distribution.

[0036] The centerline of the crankshaft 6 and the geometric center of the eccentric part constitute the central plane m of the crankshaft eccentric part. The geometric center of the upper balance block 1 and the centerline of the crankshaft 6 constitute the central plane n1 of the upper balance block. The geometric center of the lower balance block 2 and the centerline of the crankshaft 6 constitute the central plane n2 of the lower balance block. Along the rotation direction of the rotor, the central plane n1 of the upper balance block forms an angle α with respect to the central plane m of the crankshaft eccentric part. Along the rotation direction of the rotor, the central plane n2 of the lower balance block forms an angle b with respect to the central plane m of the crankshaft eccentric part.

[0037] The center planes of the upper balance block 1 and the lower balance block 2 are at a certain angle to the center plane of the eccentric part of the crankshaft 6, which optimizes the dynamic balance performance of the compressor during operation, effectively reduces the overall vibration of the compressor, optimizes the gas flow channel, improves the eddy current disturbance state near the balance structure at the upper and lower ends of the motor rotor, effectively reduces the eddy current aerodynamic noise in the upper and lower chambers of the motor rotor, and improves the overall noise of the compressor.

[0038] Preferably, the geometric center of the upper balance block 1 is located on one side outside the central plane m of the crankshaft eccentric part, and the geometric center of the lower balance block 2 is located on the other side outside the central plane m of the crankshaft eccentric part.

[0039] The geometric center of the upper balance block 1 and the geometric center of the lower balance block 2 are not within the center plane m of the crankshaft eccentric part.

[0040] Preferably, the included angle α is not equal to 0°, and the included angle β is not equal to 0°.

[0041] Preferably, the included angle α is in the range of 0°-20°. That is, the installation angle between the structural center plane of the upper balance block 1 and the eccentric center plane of the crankshaft 6 is 0°-20°, and the direction is the same as the operating rotation direction of the compressor. This is beneficial to improving the dynamic balance performance of the entire crankshaft 6 rotor system and reducing the overall vibration of the compressor.

[0042] Preferably, the included angle b ranges from 0° to 20°. That is, the installation angle between the center plane of the lower balance block 2 structure and the center plane of the eccentric part of the crankshaft 6 is 0°-20°, and the direction is the same as the operating rotation direction of the compressor. This is beneficial to improving the dynamic balance performance of the entire crankshaft 6 rotor system and reducing the overall vibration of the compressor.

[0043] Preferably, the included angles a and b are different, so that the upper balance block 1 and the lower balance block 2 at the upper and lower ends of the rotor core 3 are designed and installed asymmetrically.

[0044] More preferably, the included angle α is 10° and the included angle β is 15°.

[0045] Preferably, the included angle α and included angle β have the same value. For example, both included angle α and included angle β can be set to 10°.

[0046] Preferably, the upper balance block 1 and the lower balance block 2 are fixedly installed on the rotor core 3. Example

[0047] like Figure 1-7 As shown, this embodiment discloses a rotor balancing structure, including an upper balancing block 1 and a lower balancing block 2. The upper balancing block 1 is installed on one end of the rotor core 3, and the lower balancing block 2 is installed on the other end of the rotor core 3. The rotor core 3 is connected to a crankshaft 6, and the crankshaft 6 is provided with an eccentric part.

[0048] The difference between this embodiment three and embodiments one and two is that, when the upper balance block 1 and the lower balance block have uneven mass distribution, the centerline of the crankshaft 6 and the geometric center of the eccentric part constitute the crankshaft eccentric part center plane m, the center of mass of the upper balance block 1 and the centerline of the crankshaft 6 constitute the upper balance block center plane n1, and the center of mass of the lower balance block 2 and the centerline of the crankshaft 6 constitute the lower balance block center plane n2. Along the rotation direction of the rotor, the upper balance block center plane n1 forms an angle α with respect to the crankshaft eccentric part center plane m, and along the rotation direction of the rotor, the lower balance block center plane n2 forms an angle b with respect to the crankshaft eccentric part center plane m.

[0049] Preferably, the included angle α ranges from 0° to 20°, and the included angle β ranges from 0° to 20°.

[0050] Preferably, the value of the included angle α is different from the value of the included angle β.

[0051] Preferably, the included angle α is not equal to 0°.

[0052] Preferably, the included angle b is not equal to 0°. Example

[0053] like Figure 1-9 As shown, this embodiment provides a rotor assembly using a rotor balancing structure as described in Embodiment 1, Embodiment 2, or Embodiment 3. It also includes an upper baffle 4 fixedly provided at one end of the rotor core 3 and a lower baffle 5 fixedly provided at the other end of the rotor core 3. The upper balancing block 1 and the lower balancing block 2 are both provided with mounting holes. The upper balancing block 1 is mounted on the upper baffle 4 by a fixing member, and the lower balancing block 2 is mounted on the lower baffle by a fixing member.

[0054] The fastener is a structure used to fix the upper balance block 1 and the lower balance block 2, such as a screw, and is not specifically limited in this invention.

[0055] The crankshaft 6 and the rotor core 3 are connected together by interference fit or other fixed connection methods.

[0056] like Figure 5As shown, the installation angle design of the upper balance block 1 structure and the rotor core 3 is shown. The angle α between the structural center plane n1 of the upper balance block 1 structure and the center plane m of the eccentric part of the crankshaft 6 is 0°-20°, and α is 0°-20° forward relative to the rotation direction of the rotor assembly. When applied to a compressor, it is beneficial to improve the balance performance of the compressor and reduce compressor vibration.

[0057] For example Figure 6 The diagram shows the installation angle design of the lower balance block 2 structure and the rotor core 3. The installation angle b between the structural center plane n2 of the lower balance block 2 structure and the center plane of the eccentric part of the crankshaft 6 is 0°-20°, and b is 0°-20° forward relative to the rotation direction of the rotor assembly. When applied to a compressor, this is beneficial to improving the dynamic balance performance of the compressor during operation and reducing compressor vibration.

[0058] like Figure 8 The figure shows the turbulent kinetic energy distribution of a rotor assembly composed of ordinary symmetrical balance blocks, with a maximum turbulent kinetic energy of 1.47.

[0059] like Figure 9 The figure shows the turbulent kinetic energy distribution of the rotor assembly consisting of a balance block structure installed at a certain angle relative to the center plane of the eccentric part of the crankshaft 6 according to the present invention. The maximum turbulent kinetic energy is 1.23.

[0060] The results show that the turbulent kinetic energy of the balance block structure with a certain installation angle of the present invention is reduced by 16%. Example

[0061] This embodiment provides an electric motor, including a rotor balancing structure using a rotor as shown in Embodiment 1, Embodiment 2, or Embodiment 3, or a rotor assembly having a rotor balancing structure as shown in Embodiment 4. Example

[0062] This embodiment provides a compressor, including a rotor assembly with a rotor balancing structure as shown in Embodiment 1, Embodiment 2, or Embodiment 3, or a rotor assembly with a rotor balancing structure as shown in Embodiment 4, or a motor as shown in Embodiment 5.

[0063] The main function of this invention is to improve the dynamic balance performance of the compressor during operation by adopting a balancing structure at the upper and lower ends of the rotor, effectively reducing the overall vibration of the compressor, optimizing the gas flow path at the upper and lower ends of the rotor for the gas discharged from the cylinder, improving the eddy current disturbance state near the balancing structure at the upper and lower ends of the motor rotor, and effectively reducing the eddy current aerodynamic noise at the upper and lower ends of the motor rotor and the overall noise of the machine.

[0064] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. In the description of this invention, it should be understood that the terms "upper end face," "lower end face," "top," "bottom," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention; therefore, they should not be construed as limiting the actual direction of use of this invention.

[0065] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A rotor balancing structure, comprising an upper balancing block and a lower balancing block, wherein the upper balancing block is mounted on one end of a rotor core, the lower balancing block is mounted on the other end of the rotor core, and a crankshaft is connected to the rotor core, the crankshaft having an eccentric portion, characterized in that, The centerline of the crankshaft and the geometric center of the eccentric part constitute the central plane of the crankshaft eccentric part. The geometric center of the upper balance block and the centerline of the crankshaft constitute the central plane of the upper balance block. The geometric center of the lower balance block and the centerline of the crankshaft constitute the central plane of the lower balance block. Along the rotation direction of the rotor, the central plane of the upper balance block forms an angle α with respect to the central plane of the crankshaft eccentric part. Along the rotation direction of the rotor, the central plane of the lower balance block forms an angle b with respect to the central plane of the crankshaft eccentric part. The range of angle α is 0°-20°, and the range of angle b is 0°-20°.

2. The rotor balancing structure according to claim 1, characterized in that, The geometric center of the upper balance block is located on one side outside the central plane of the crankshaft eccentric part, and the geometric center of the lower balance block is located on the other side outside the central plane of the crankshaft eccentric part.

3. The rotor balancing structure according to claim 1, characterized in that, The included angle α and included angle β have different values.

4. The rotor balancing structure according to claim 1, characterized in that, The included angle α and included angle β have the same value.

5. The rotor balancing structure according to claim 1, characterized in that, The included angle a is 10° and the included angle b is 15°.

6. A rotor assembly using a rotor balancing structure as described in any one of claims 1-5, characterized in that, An upper baffle is fixedly provided at one end of the rotor core, and a lower baffle is fixedly provided at the other end of the rotor core. Both the upper and lower balance blocks are provided with mounting holes. The upper balance block is installed on the upper baffle by a fixing component, and the lower balance block is installed on the lower baffle by a fixing component.

7. An electric motor, characterized in that, This includes a balancing structure using a rotor as described in any one of claims 1-5.

8. A compressor, characterized in that, This includes a balancing structure using a rotor as described in any one of claims 1-5.

Images