Motors, rotary compressors and electrical products

Abstract

The present invention provides a motor, a rotary compressor and an electrical product, which relates to the technical field of motors, and solves the technical problems in the prior art that the working temperature and noise of the motor are high, which affects the working performance and service life of the corresponding electrical products, and also reduces the comfort level of users. The motor includes a stator and a rotor, and there is an air gap between the stator and the rotor. It is characterized in that the outside of the rotor is coated with a heat insulation layer, and the thickness of the heat insulation layer is less than the length of the air gap; and a plurality of vacuum hole structures are arranged inside the heat insulation layer. The present invention covers the outside of the rotor with a heat insulation layer and arranges a vacuum hole structure inside the heat insulation layer, so that the heat generated by the rotor is absorbed by the heat insulation layer in large quantities, thereby reducing the working temperature of the motor. At the same time, the heat insulation layer and the vacuum hole structure also have a silencing effect, which can reduce the noise generated by the motor during operation and improve the comfort level of users of the electrical products.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor, a rotary compressor and an electrical product. Background Art

[0002] The motor is a device that converts electrical energy into mechanical energy through electromagnetic action, driving rotary compressors and other electrical products. During the operation of rotary compressors and other electrical products, the motor is the main source of heat and noise. For example, during the operation of the compressor, the motor drives the load, which is the compressor pump body, as the power to compress the gas. During the operation of the compressor, the motor runs at high speed. As the working conditions intensify, huge heat will be generated. The poor heat dissipation effect of the motor will cause the temperature inside the compressor to be too high, causing the compressor to suffocate. At the same time, the noise will also affect the user's comfort.

[0003] The applicant has found that the prior art has at least the following technical problems:

[0004] In the prior art, the operating temperature of the motor is relatively high and the noise is relatively loud, which affects the working performance and service life of the corresponding electrical products and also affects the comfort of use. Summary of the invention

[0005] The purpose of the present invention is to provide a motor, a rotary compressor and an electrical product to solve the technical problem that the motor in the prior art has a high operating temperature and a large noise, which affects the working performance and service life of the corresponding electrical product and also affects the comfort of use. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a motor, comprising a stator and a rotor, wherein an air gap exists between the stator and the rotor, the outside of the rotor is coated with a heat insulation layer, the thickness of the heat insulation layer is less than the length of the air gap; and a plurality of vacuum hole structures are arranged inside the heat insulation layer.

[0008] Optionally, the thermal insulation layer is made of polyurethane.

[0009] Optionally, a plurality of arc-shaped cooling fins are arranged on the outer side of the stator.

[0010] Optionally, the plurality of arc-shaped heat sinks form a rectangular array of multiple rows and columns along the outer surface of the stator; the arc-shaped heat sinks form a row structure along the circumferential direction of the outer side of the stator, and the arc-shaped heat sinks form a column structure along the axial direction of the outer side of the stator.

[0011] Optionally, the rectangular array is a uniformly distributed structure of 7 rows and 12 columns.

[0012] Optionally, all the arc-shaped heat sinks located on any busbar of the stator are axially extended and connected to form a strip-shaped protrusion structure, and the strip-shaped protrusion structure includes two oppositely arranged ones.

[0013] Optionally, the ratio of the spacing between two adjacent rows of the arc-shaped heat sinks to the thickness of the arc-shaped heat sinks is 25:4.

[0014] Optionally, the outer surface of the arc-shaped heat sink is provided with a sound-absorbing coating.

[0015] Optionally, each of the arc-shaped heat sinks is an integrated structure.

[0016] Optionally, the arc-shaped heat sink is made of copper.

[0017] Optionally, the arc-shaped heat sink is connected to the outer side of the stator by welding.

[0018] A rotary compressor comprises a motor, wherein the motor is the motor mentioned above.

[0019] An electrical product includes a motor, wherein the motor is the motor described above.

[0020] Any of the above technical solutions can at least produce the following technical effects:

[0021] The present invention covers the outside of the rotor with an insulation layer and sets a vacuum hole structure in the insulation layer. The heat generated by the rotor is largely absorbed by the insulation layer, which can reduce the working temperature of the motor and improve the working performance and service life of the electrical product using the motor. At the same time, the shielding of the insulation layer also has a certain silencing effect, and the vacuum hole structure can further enhance this silencing effect, reduce the noise generated by the motor, and improve the comfort of users of the electrical product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a top view of the motor;

[0024] Figure 2 It is the front view of the motor;

[0025] Figure 3 is a schematic diagram of the thermal insulation layer;

[0026] Figure 4 is a schematic diagram of a compressor.

[0027] In the figure, 1, rotor; 11, thermal insulation layer; 12, vacuum hole; 2, stator; 21, arc-shaped heat sink; 22, sound-absorbing coating; 3, air gap; 4, compressor housing. DETAILED DESCRIPTION

[0028] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0029] The present invention provides a motor, such as Figure 2 As shown, it includes a stator 2 and a rotor 1. The stator 2 is outside the rotor 1. There is an air gap 3 between the stator 2 and the rotor 1. The air gap 3 is the gap between the rotor 1 and the stator 2, which facilitates the rotating magnetic field generated by the stator 2 to drive the rotor 1 to rotate. During the operation of the motor, the rotor 1 generates a large amount of heat, which will be transferred to the stator 2, and eventually the internal temperature of the electrical equipment using the motor is too high, affecting the performance. The outside of the rotor 1 is coated with a heat insulation layer 11. The heat insulation layer 11 is made of a low thermal conductivity material. The lower the thermal conductivity of the silicon steel sheet of the rotor 1 is 30W / (mK), the better. When the rotor 1 generates heat and transfers it outward, it is first absorbed by the heat insulation layer 11 and then transferred to the stator 2, which can greatly reduce the heat transfer to the stator 2. At the same time, the material with low thermal conductivity is generally loose in structure and has a good sound absorption effect, which can reduce the amount of noise transmitted outward by the motor and play a certain degree of silencing effect. The thickness of the thermal insulation layer 11 is less than the length of the air gap 3, so that the thermal insulation layer 11 will not affect the normal operation of the motor. The length of the air gap 3 is generally 0.2mm-2mm. According to the actual length of the air gap 3, the thickness of the thermal insulation layer 11 can be lower than this value. The thermal insulation layer 11 is preferably connected to the rotor 1 by gluing. First, the thermal insulation layer 11 is hot-melt sprayed, and then it is glued to the outermost layer of the rotor 1. Finally, the thermal insulation layer 11 is fixed to the rotor 1 by pressing, which not only ensures the strength of the rotor 1, but also achieves a firm fixation of the thermal insulation layer 11. Figure 3As shown, the interior of the thermal insulation layer 11 is provided with a plurality of vacuum holes 12 structures, and the vacuum holes 12 may be circular, square or other geometric shapes. The vacuum holes 12 structure may further enhance the thermal insulation effect, and at the same time, the cavity silencing effect may also enhance the silencing effect of the thermal insulation layer 11. By coating the thermal insulation layer 11 on the outside of the rotor 1 and providing the vacuum holes 12 structure in the thermal insulation layer 11, the heat generated by the rotor 1 is largely absorbed by the thermal insulation layer 11, which can reduce the operating temperature of the motor and improve the operating performance and service life of the electrical product using the motor. At the same time, the shielding of the thermal insulation layer 11 also has a certain silencing effect, and the vacuum holes 12 structure may further enhance this silencing effect, reduce the noise generated by the motor, and improve the comfort level of the user of the electrical product.

[0030] As an optional implementation, the material of the heat insulation layer 11 is polyurethane, which is an emerging organic polymer material with the characteristics of light weight, sound insulation and excellent heat insulation performance. The thermal conductivity is 0.024W / (mK), which is much smaller than the thermal conductivity of the silicon steel sheet of the rotor 1, and can play a good heat insulation effect, and can achieve the effects of sound insulation and heat insulation at the same time. The use temperature range of polyurethane material is wide, and it can be used normally within 100 degrees, and the heat insulation performance will not be reduced due to the continuous operation of the rotor 1.

[0031] As an optional implementation, Figure 1-2 As shown, a plurality of arc-shaped heat sinks 21 are arranged on the outside of the stator 2, and the cross-sectional shape of the arc-shaped heat sink 21 is as follows: Figure 2 As shown, the heat sink structure increases the heat dissipation area of ​​the outer surface of the stator 2, which can effectively reduce the operating temperature of the motor. According to the analysis of heat transfer performance, the temperature difference is constant per unit distance from the root to the top of the heat sink. Therefore, under the same material weight, the heat dissipation efficiency of the arc-shaped heat sink 21 is higher than that of the straight-shaped structure. At the same time, since the straight-shaped heat sink is continuous in the direction parallel to the airflow, and the arc-shaped heat sink 21 is disconnected in the direction parallel to the airflow, the thermal boundary layer of the flow can be continuously thinned, and the resistance of the cooling air flowing to the root of the arc-shaped heat sink 21 is also small, so that the coordination of the velocity field and the temperature gradient field is improved, and the heat dissipation area of ​​the stator 2 is effectively increased. Therefore, the arc structure of the arc-shaped heat sink 21 further enhances the heat dissipation effect of the stator 2.

[0032] As an optional implementation, Figure 1-Figure 2As shown, a plurality of arc-shaped heat sinks 21 form a rectangular array of multiple rows and columns along the outer surface of the stator 2. The arc-shaped heat sinks 21 form a row structure along the circumferential direction of the outer side of the stator 2, and the arc-shaped heat sinks 21 form a column structure along the axial direction of the outer side of the stator 2. After the cylindrical structure formed by the stator 2 is divided into a plurality of small cylinders, it is preferably divided equally into a plurality of small cylinders, and the plurality of arc-shaped heat sinks 21 arranged on the outer circumference of each cylinder is a row of arc-shaped heat sinks 21. The cross-sectional circle of the cylindrical structure formed by the stator 2 is divided into a plurality of sectors, preferably divided equally into a plurality of sectors, and the cross-sectional sectors form a three-dimensional structure with the axial direction of the stator 2, and the plurality of arc-shaped heat sinks 21 arranged on the outer side of the three-dimensional structure is a column of arc-shaped heat sinks 21. Multiple rows and columns of arc-shaped heat sinks 21 form a rectangular array structure. It is preferred to align the plurality of arc-shaped heat sinks 21 in each row, and the arc-shaped heat sinks 21 in each column are also aligned, which is more beautiful and convenient for manufacturing. The multi-row and multi-column structure of the arc-shaped heat sink 21 is neatly arranged, which is convenient for the arrangement of the multiple arc-shaped heat sinks 21 outside the stator 2 and has a better heat dissipation effect. The rectangular array formed by the multiple arc-shaped heat sinks 21 is a uniformly distributed structure of 7 rows and 12 columns. The arc-shaped heat sink 21 has a good heat dissipation effect under this number of rows and columns. Of course, the number of rows and columns of the arc-shaped heat sink 21 can also be set to other numbers according to actual needs, such as the number of rows is set to 6 rows, 8 rows, etc., and the number of columns is set to 11 columns, 13 columns, etc., which will not be described in detail here.

[0033] As an optional implementation, all the arc-shaped heat sinks 21 located on any busbar of the stator 2 extend axially and connect to form a strip-shaped protrusion structure, and the strip-shaped protrusion structure includes two oppositely arranged ones. That is, there are two opposite columns in the column structure of the arc-shaped heat sink 21 (that is, the angle formed between the two columns is 180 degrees) that are not divided in the row direction to form a strip-shaped protrusion structure. Other columns other than these two columns are still divided into multiple rows. The other side of the strip-shaped protrusion structure connected to the stator 2 is preferably a flat surface without curvature, which is convenient for welding and fixing with the inner side of the electrical product, making the welding more firm.

[0034] As an optional implementation, the ratio of the spacing between two adjacent columns of arc-shaped heat sinks 21 to the thickness of the arc-shaped heat sink 21 is 25:4. If the spacing between two adjacent columns of arc-shaped heat sinks 21 in each row is too large, the total heat dissipation area of ​​the arc-shaped heat sink 21 will be reduced. If the spacing is too small, the cooling gas resistance will be increased, affecting the heat dissipation effect. At the same time, the length of the arc-shaped heat sink 21 along the axial direction of the stator 2 is the thickness. If the arc-shaped heat sink 21 is too thick, it will occupy too much area on the outside of the stator 2, which will reduce the total number of arc-shaped heat sinks 21, and also affect the total heat dissipation area of ​​the arc-shaped heat sink 21. If the arc-shaped heat sink 21 is too thin, it is difficult for heat to be transferred from the outside of the stator 2 to the arc-shaped heat sink 21. Therefore, the spacing and thickness ratio between the arc-shaped heat sink 21 should be appropriate to achieve better heat dissipation effect. A ratio of 25:4 can achieve a better heat dissipation effect. Of course, the ratio of the spacing and thickness between the arc-shaped heat sinks 21 is not limited to 25:4, and other ratios equivalent to this ratio can also achieve similar effects, such as 24:4 or 26:5, etc., which will not be given in detail here.

[0035] As an optional embodiment, the outer surface of the arc-shaped heat sink 21 is provided with a sound-absorbing coating 22, which is preferably an inorganic fiber material in the prior art, which has the advantages of being thin and light and having strong adhesion, and is coated on the outer surface of the arc-shaped heat sink 21 by spraying. The sound-absorbing coating 22 can further absorb the noise of the motor and reduce the impact of the noise.

[0036] As an optional implementation, each arc-shaped heat sink 21 is an integrated structure. The integrated structure makes the manufacturing cost relatively low and can also avoid stress concentration in some areas of the arc-shaped heat sink 21, which affects the heat dissipation effect.

[0037] As an optional implementation, the arc-shaped heat sink 21 is made of copper, which has better heat dissipation than aluminum and is also convenient for subsequent welding and other processing. Of course, the arc-shaped heat sink 21 can also be made of other materials, such as aluminum, low-carbon steel, etc., taking into account cost and manufacturing process.

[0038] As an optional implementation, the arc-shaped heat sink 21 is connected to the outer side of the stator 2 by welding, and the arc-shaped heat sink 21 is easily fixed by welding, and the operation is simple. A plurality of arc-shaped heat sinks 21 can also be integrally arranged on a thin hollow tube, and the hollow tube is embedded in the outer side of the stator 2 to be fixed to the stator 2, and the plurality of arc-shaped heat sinks 21 are integrally manufactured with the hollow tube or welded to the outer tube wall of the hollow tube. This method can manufacture a hollow tube and a plurality of arc-shaped heat sinks 21 of matching size in advance according to the specifications of the motor, and only needs to be assembled with the motor stator 2 when in use, thereby improving the operation efficiency.

[0039] A rotary compressor includes a motor, wherein the motor is the motor provided by the present invention. Figure 4As shown, the motor is preferably welded and fixed to the inner side of the compressor housing 4 by two strip-shaped protrusion structures formed by the arc-shaped heat sink 21. The motor provided by the present invention is optimized by heat insulation and noise reduction, which effectively reduces the operating temperature and noise of the motor, stabilizes the working performance, and prolongs the life of the rotary compressor.

[0040] An electrical product includes a motor, wherein the motor is the motor provided by the present invention, and the electrical product is an air conditioner, a washing machine, a refrigerator, etc. When the electrical product is an air conditioner, the rotary compressor provided by the present invention is used. The electrical product achieves a reduction in operating temperature and noise through the motor provided by the present invention, and the operation is more stable and reliable, thereby increasing the service life of the electrical product and improving the comfort of people.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A motor, comprising a stator and a rotor, wherein an air gap exists between the stator and the rotor, wherein: The rotor is coated with a heat insulation layer on the outside, and the thickness of the heat insulation layer is less than the length of the air gap; a plurality of vacuum hole structures are arranged inside the heat insulation layer; A plurality of arc-shaped cooling fins are arranged on the outer side of the stator; The plurality of arc-shaped heat sinks form a rectangular array of multiple rows and columns along the outer surface of the stator; the arc-shaped heat sinks form a row structure along the circumferential direction of the outer side of the stator, and the arc-shaped heat sinks form a column structure along the axial direction of the outer side of the stator; The ratio of the spacing between two adjacent rows of the arc-shaped heat sinks to the thickness of the arc-shaped heat sinks is 25:4; Each of the arc-shaped heat sinks is an integrated structure.

2. The motor according to claim 1, characterized in that The material of the heat insulation layer is polyurethane.

3. The motor according to claim 1, characterized in that The rectangular array is a structure of 7 rows and 12 columns evenly distributed.

4. The motor according to claim 1, characterized in that All the arc-shaped heat sinks located on any busbar of the stator are axially extended and connected to form a strip-shaped protrusion structure, and the strip-shaped protrusion structure includes two oppositely arranged ones.

5. The motor according to claim 1, characterized in that The outer surface of the arc-shaped heat sink is provided with a sound-absorbing coating.

6. The motor according to claim 1, characterized in that The arc-shaped heat sink is made of copper.

7. The motor according to claim 1, characterized in that The arc-shaped heat sink is connected to the outer side of the stator by welding.

8. A rotary compressor, comprising a motor, characterized in that: The motor is the motor described in any one of claims 1-7.

9. An electrical product, comprising a motor, characterized in that: The motor is the motor described in any one of claims 1-7.

Images