CN211908524U - Motor stator fixed knot constructs, motor and compressor - Google Patents

Abstract

The utility model discloses a motor stator fixing structure, a motor and a compressor. The stator and the casing are fixed by welding, which can reduce the motor efficiency drop caused by the stress on the stator, improve the assembly accuracy of the stator and the rotor, and improve the air gap between the stator and the rotor. Uniformity and noise reduction. Compared with the glued fixing of the stator in the prior art, the efficiency of fixing by welding is higher, and the operability is simpler. In addition, after the stator and the upper casing are welded into an assembly, the interference fit or clearance fit between the stator and the lower casing can offset the positional deviation caused by welding, thereby ensuring the positional accuracy of the stator and the rotor, and further improving the air gap between the stator and the rotor. uniformity. Steps can also be made on the inner wall of the casing by machining, so that the stator can ensure a certain position accuracy.

Description

A motor stator fixing structure, motor and compressor

technical field

The utility model relates to the field of electric compressors of refrigeration equipment such as air conditioners and refrigerators, in particular to a motor stator fixing structure, a motor and a compressor.

Background technique

A compressor is a driven fluid machine that lifts low-pressure gas into high-pressure gas, and is the heart of a refrigeration system. It inhales low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. The fully enclosed refrigeration compressor is the core component of the refrigeration system. Usually, the compression mechanism and the motor are installed in a shell welded or brazed, and share a main shaft, which not only cancels the shaft sealing device, but also greatly reduces the and reduced the size and weight of the entire compressor. Only the suction and exhaust pipes, process pipes and other necessary pipes (such as spray pipes), input power terminals and compressor brackets are welded on the outer surface of the casing. However, since the entire compression mechanism and motor unit are installed in a sealed casing that cannot be disassembled, it is not easy to open for internal repairs. Therefore, this type of compressor is required to have high reliability and long service life, and the installation requirements of the entire refrigeration system are also required. High, this fully enclosed structure is generally used in mass-produced low-capacity refrigeration compressors.

Please refer to FIG. 1. FIG. 1 shows the fixing method of the motor stator in the existing closed-type electric compressor. The motor stator 1 and the motor housing 2 are all fixed by shrinking. Due to the shrinking process, the motor is fixed and fixed. Even if the rotor air gap is fixed by the fixture, the phenomenon of uneven air gap between the stator and the rotor will occur, and the stator 1 of the motor will be subjected to radial compressive stress, resulting in an increase in iron loss and a decrease in the efficiency of the motor. The existing closed electric compressors all adopt the way of fixing the motor stator and the casing by heat sleeve. Due to the heat sleeve process, the air gap between the stator and rotor of the motor will be uneven even when the clamp is fixed. phenomenon, and cause stress in the stator electrical steel, affecting the efficiency of the motor.

Please refer to FIG. 2. In the prior art, a stator fixing structure for an electric compressor is also proposed. After the motor stator heat sleeve is changed to be glued and fixed on the housing, the motor caused by the radial compressive force on the stator can be reduced. The efficiency is reduced, and the assembly accuracy of the stator and the rotor is improved, the uniformity of the air gap between the stator and the rotor is improved, and the noise is reduced. The problem of air gap accuracy of the stator and rotor is solved by the technical solution in FIG. 2 . However, the inventor finds in a specific practical application that since it is fixed by gluing, the operation is relatively complicated, so the production efficiency is low.

Therefore, there is a need to propose a solution that can improve production efficiency.

It should be noted that the information disclosed in the background of the present utility model is only intended to deepen the understanding of the general background of the present utility model, and should not be regarded as an acknowledgement or implied in any form that the information constitutes the knowledge of those skilled in the art. well-known prior art.

Utility model content

The purpose of the utility model is to provide a motor stator fixing structure, a motor and a compressor, which are used to solve the problems of complicated operation and low production efficiency in the prior art.

In order to solve the above technical problems, the present invention proposes a stator fixing structure for a motor. The motor includes a casing and a stator, the casing has an accommodation space, and the stator is arranged in the accommodation space;

The stator has an outer wall of the stator, the casing has an inner wall of the casing, the shape and size of the outer wall of the stator matches the shape and size of the inner wall of the casing, and the outer wall of the stator is sleeved in the inner wall of the casing , the inner wall of the casing and the outer wall of the stator are connected by welding and interference fit or clearance fit;

Wherein, the casing includes an upper casing and a lower casing, and the upper casing and the stator are fixedly connected by the welding method to form a first assembly;

The first component and the lower casing are connected by the interference fit or the clearance fit.

Optionally, the welding method includes laser welding, gas shielded welding or brazing.

Optionally, the penetration depth of the welding method is greater than the thickness of the shell.

Optionally, the interference amount of the interference fit is 0mm-0.1mm, or the clearance of the clearance fit is 0mm-0.3mm.

Optionally, a protruding portion is provided on the inner wall of the lower casing, and one end of the stator is connected to the protruding portion.

Optionally, the raised portion is a step.

Optionally, the height of the step is 0.1mm-2mm.

Optionally, the casing further has a connecting part, the connecting part is the connecting part of the upper casing and the lower casing, and the upper casing and the lower casing are at the connecting part The position is fixedly connected by the welding method.

Based on the same inventive concept, the present invention also provides a motor, which includes the motor stator fixing structure described in any one of the above feature descriptions.

Based on the same inventive concept, the utility model also proposes a compressor, including the motor.

Compared with the prior art, the utility model has the following beneficial effects:

1. The motor stator fixing structure proposed by the present utility model uses welding to fix the stator and the housing, which can reduce the decrease in motor efficiency caused by the stress on the stator, improve the assembly accuracy of the stator and rotor, improve the uniformity of the air gap between the stator and the rotor, and reduce noise. . Compared with the glued fixing of the stator in the prior art, the efficiency of fixing by welding is higher, and the operability is simpler. In addition, after the stator and the upper casing are welded into an assembly, the interference fit or clearance fit between the stator and the lower casing can offset the positional deviation caused by welding, thereby ensuring the positional accuracy of the stator and the rotor, and further improving the air gap between the stator and the rotor. uniformity.

2. Steps can also be made on the inner wall of the casing by machining, so that the stator can ensure a certain position accuracy.

3. The connection between the upper casing and the lower casing is fixedly connected by welding, which can ensure the sealing of the motor or compressor to be assembled later.

The motor and the compressor proposed by the utility model belong to the same inventive concept as the stator fixing structure of the motor, and therefore, they have the same beneficial effects.

Description of drawings

Fig. 1 is the schematic diagram of the fixing mode of the motor stator in the hermetic electric compressor in the prior art;

2 is a schematic diagram of a stator fixing structure of an electric compressor in the prior art;

3 is a schematic diagram of the internal structure of a first component in a stator fixing structure of a motor proposed by an embodiment of the present invention;

4 is a schematic diagram of the internal structure of a stator fixing structure of a motor proposed by an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a method for fixing a motor stator according to another embodiment of the present invention;

Among them, in Figure 1: 1-motor stator, 2-motor housing;

In Fig. 3 and Fig. 4: 10-shell, 11-upper shell, 12-lower shell, 100-inner wall of shell, 20-stator, 200-stator outer wall, 30-protrusion.

Detailed ways

The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. The advantages and features of the present invention will become more apparent from the following description. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc. are based on the orientations or positions shown in the accompanying drawings The relationship is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

Please refer to FIG. 3 and FIG. 4 , the present invention proposes a fixing structure for the stator 20 of a motor. The motor includes a casing 10 and a stator 20 . in the setting space. The stator 20 has a stator outer wall 200, the casing 10 has a casing inner wall 100, the shape and size of the stator outer wall 200 is matched with the shape and size of the casing inner wall 100, and the stator outer wall 200 is sleeved In the inner wall 100 of the casing, the inner wall 100 of the casing and the outer wall 200 of the stator are connected by welding and interference fit or clearance fit. The casing 10 includes an upper casing 11 and a lower casing 12 , and the upper casing 11 and the stator 20 are fixedly connected by welding to form a first assembly. The first component and the lower casing 12 are connected by interference fit or clearance fit.

The difference from the prior art is that, in the fixing structure of the motor stator 20 proposed by the present invention, the stator 20 and the housing 10 are fixed by welding, which can reduce the decrease of the motor efficiency caused by the force on the stator 20, and Improve the stator and rotor assembly accuracy, improve the uniformity of the stator and rotor air gap, and reduce noise. Compared with the adhesive fixing of the stator 20 in the prior art, the efficiency of fixing by welding is higher, and the operability is simpler. In addition, after the stator 20 and the upper casing 11 are welded into an assembly, the interference fit or clearance fit between the stator 20 and the lower casing 12 offsets the positional deviation caused by welding, thereby ensuring the stator 20 and the rotor. Position accuracy, and further improve the uniformity of the stator and rotor air gap.

In specific practice, firstly, the upper casing 11 and the stator 20 are fixedly connected by welding, please refer to FIG. 3 . At this time, the upper casing 11 and the stator 20 are welded to form the The first component is then cold-pressed into the lower casing 12 with a higher positional accuracy with the rotor through interference fit or clearance fit, please refer to FIG. 4 . Therefore, the positional accuracy of the stator and the rotor can be further ensured, and the uniformity of the air gap between the stator and the rotor can be further improved.

Preferably, the welding method can use laser welding. It should be noted that the technical solution of the embodiment of the present invention does not add any additional process for fixing the stator 20. When welding the upper casing 11, the welding method uses laser welding, Using laser welding has the advantages of large penetration and small heat, and the upper casing 11 and the stator 20 can be fixed together at the same time. The laser welding belongs to fusion welding. The so-called fusion welding refers to the welding method in which the metal at the joint is brought to a molten state under the action of high temperature during the welding process, which can form a solid welded joint. Because the workpieces to be welded are closely attached together, under the action of temperature field, gravity, etc., without pressure, the melted liquid of the two workpieces will mix. After the temperature is lowered, the molten part condenses, and the two workpieces are firmly welded together to complete the welding method. Due to the high temperature phase transformation process inherent in the welding process, a heat affected zone is created in the welding area. It can be understood that in other embodiments, other types of welding methods may also be selected, for example, arc welding, gas shielded welding, brazing, electroslag welding, electron beam welding, or plasma welding, etc. Many other types of welding methods are not described here.

Further, the penetration depth of the laser welding is greater than the thickness of the casing 10 . By setting the penetration depth of the laser welding to be greater than the thickness of the casing 10 , it can further ensure that the casing 10 and the casing 10 are simultaneously connected. The stators 20 are fixed together.

The stator 20 is sleeved in the casing 10 and is fixedly connected with the inner wall 100 of the casing. The matching of the shape and size of the inner wall 100 of the housing with the shape and size of the outer wall 200 of the stator means that the shape of the outer surface of the stator 20 is consistent with the shape of the inner surface of the housing 10, and the size is the same. It is suitable, so that when the stator 20 is sleeved on the inner wall of the casing 10, a gap-stable clearance fit or suitable interference can be formed between the outer surface of the stator 20 and the inner surface of the casing 10. the interference fit. In the embodiment of the present invention, when the stator 20 is installed in the casing 10, if clearance fit is used, the gap between the outer wall 200 of the stator and the inner wall 100 of the casing is 0mm-0.3mm , and preferably 0.3mm; if an interference fit is used, the interference between the outer wall 200 of the stator and the inner wall 100 of the casing is 0mm-0.1mm, and preferably 0.1mm. Under better dimensional accuracy, when the circumferential consistency after welding and fixing can be ensured, the assembly accuracy of the stator and the rotor can be improved, and the uniformity of the air gap between the stator 20 and the rotor can be improved. It should be noted that, in the implementation of the present invention, the gap between the outer wall 200 of the stator and the inner wall 100 of the casing actually refers to the outer surface of the stator 20 in the first assembly and the lower casing 12. Similarly, the interference between the outer wall 200 of the stator and the inner wall 100 of the casing refers to the distance between the outer surface of the stator 20 in the first assembly and the lower casing 12. The amount of interference between.

In the embodiment of the present invention, the inner wall 100 of the casing and the outer wall 200 of the stator are connected by welding, interference fit or clearance fit. And the welding method used can be laser welding, so that the fixed strength between the stator 20 and the casing 10 satisfies: greater than 1KN in all directions, that is, greater than 1KN in the radial direction, and greater than 1KN in the axial direction downward. 1KN, more than 1KN in the axial direction. Since the compressor is installed vertically, the main force direction of the motor stator 20 during installation is the direction of gravity. Therefore, the radial fixing can be performed by welding, so that no radial compressive stress is generated on the surface of the stator 20. The preferred welding method is laser welding. Weld to ensure that the fixing strength between the stator 20 and the housing 10 is greater than 1KN in all directions.

In addition, in the embodiment of the present utility model, preferably the material of the stator 20 is electrical steel, which is also called silicon steel sheet, the English name is silicon lamination, which is a kind of ferrosilicon soft steel with extremely low carbon content. Magnetic alloys generally contain 0.5 to 4.5% silicon. The addition of silicon increases the resistivity and maximum permeability of iron, and reduces coercivity, core loss (iron loss), and magnetic aging. Electrical steel is an indispensable and important soft magnetic alloy in the power, electronics and military industries, and it is also the metal functional material with the largest output. It is mainly used as the iron core of various motors, generators and transformers. And preferably the material of the motor housing 10 is carbon steel, carbon steel is an iron-carbon alloy with a carbon content of 0.0218%-2.11%, also called carbon steel, generally also contains a small amount of silicon, manganese, sulfur, phosphorus, generally The higher the carbon content in carbon steel, the greater the hardness and the higher the strength. Preferably, the material of the casing 10 is carbon steel, and the carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Also called carbon steel. Generally also contains a small amount of silicon, manganese, sulfur, phosphorus. Generally, the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity. It can be understood by those skilled in the art that the electrical steel and the carbon steel have many types of different grades, and a suitable type needs to be selected according to actual needs during specific implementation, which will not be repeated here.

Please continue to refer to FIGS. 3 and 4 , in the embodiment of the present invention, preferably, a raised portion 30 is provided on the inner wall of the lower casing 12 , and one end of the stator 20 is connected to the raised portion 30 . And preferably, the protruding portion 30 surrounds the inner wall of the lower casing 12 for a circle. When the stator 20 is installed in the housing 10 , one end of the stator 20 is connected to the protruding portion 30 , that is, when the first component is connected to the lower housing 12 , the One end of the stator 20 is disposed on the protruding portion 30 so as to fix the position of the stator 20 in the axial direction. In the embodiment of the present invention, preferably, the raised portion 30 is a step, a retaining spring or a stopper.

When the protruding portion 30 is a step, the protruding portion 30 and the lower casing 12 are integrally formed. The integral molding in the present invention means that the lower casing 12 itself is formed directly or formed by processing, and there is no need to install or set other components on the lower casing 12 to form. When the protruding portion 30 is formed as a step, it can be implemented as a preferred solution because it has the advantage that it does not need to be formed by installing or disposing other components on the lower casing 12 .

Please refer to FIG. 3 and FIG. 4 , in the embodiment of the present invention, the inner diameter of the lower casing 12 of the motor is preferably made a step by machining. When the motor stator 20 is installed in the lower housing 12, the step can make the motor stator 20 axially fixed. The height of the steps is preferably 0.1 mm-2 mm.

In other embodiments, the protruding portion 30 may also be a retaining spring, and the retaining spring may be fixedly connected to the inner wall of the lower casing 12 through a slot or directly. The retaining ring in the embodiment of the present invention, also known as a retaining ring or a retaining ring, belongs to a kind of fastener, which is installed in the shaft groove or hole groove of the machine and equipment, and plays the role of preventing the force on the shaft or the hole. The effect of the axial movement of the part. It can be understood that, in other embodiments, the protruding portion 30 may also be a stopper, which is fixed on the inner wall of the lower casing 12 by welding or other means, so as to block the axial movement of the stator 20 of the motor.

Preferably, please refer to FIG. 4 , the above analysis shows that the casing 10 includes an upper casing 11 and a lower casing 12 , in addition, the casing 10 further has a connecting portion, and the connecting portion is the upper casing At the connection between the body 11 and the lower casing 12, after the first component and the lower casing are in interference fit or clearance fit, in order to ensure their sealing, the upper casing 11, the The lower casing 12 is fixedly connected at the position of the connecting portion by the welding method. Preferably, the joints of the upper casing 11 and the lower casing 12 are fused together by laser welding. Fixing by welding is more efficient and easier to operate. It should be noted that the penetration depth at this time does not need to be greater than the thickness of the casing, as long as the upper casing 11 and the lower casing 12 can be sealedly connected.

Based on the same inventive concept, another embodiment of the present invention provides a method for fixing a motor stator 20. The motor includes a housing 10 and a stator 20, the stator 20 has a stator outer wall 200, and the housing 10 has a housing inner wall 100 , the shape and size of the outer wall 200 of the stator match the shape and size of the inner wall 100 of the casing, and the casing 10 includes an upper casing 11 and a lower casing 12 . Please refer to FIG. 5 , the fixing method of the motor stator 20 includes the following steps:

S1: The upper casing 11 and the stator 20 are fixedly connected by welding to form a first assembly;

S2: Connect the first component and the lower casing 12 through interference fit or clearance fit.

The method for fixing the motor stator 20 provided by the embodiment of the present invention uses welding to fix the stator 20 and the casing 10, which can reduce the motor efficiency drop caused by the force on the stator 20, improve the assembly accuracy of the stator and the rotor, and improve the uniformity of the air gap between the stator and the rotor. sex, reduce noise. Compared with the adhesive fixing of the stator 20 in the prior art, the efficiency of fixing by welding is higher, and the operability is simpler. In addition, after the stator 20 and the upper casing 11 are welded into an assembly, the interference fit or clearance fit between the stator 20 and the lower casing 12 offsets the positional deviation caused by welding, thereby ensuring the stator 20 and the rotor. Position accuracy, and further improve the uniformity of the stator and rotor air gap.

Preferably, the following steps are also included:

The upper casing 11 and the lower casing 12 are fixedly connected by the welding method at the position of the connecting part;

Wherein, the connection part is the connection between the upper casing 11 and the lower casing 12 .

The upper casing 11 and the lower casing 12 are sealed and connected by welding, and finally a closed motor or compressor can be formed.

Based on the same inventive concept, yet another embodiment of the present invention provides a motor, including the motor stator fixing structure described in any one of the above feature descriptions or using the motor stator fixing method.

Based on the same inventive concept, another embodiment of the present invention further provides a compressor, including the motor.

To sum up, the stator fixing structure of the motor proposed by the present invention uses welding to fix the stator and the casing, which can reduce the motor efficiency drop caused by the stress on the stator, improve the assembly accuracy of the stator and the rotor, and improve the uniformity of the air gap between the stator and the rotor. , to reduce noise. Compared with the glued fixing of the stator in the prior art, the efficiency of fixing by welding is higher, and the operability is simpler. In addition, after the stator and the upper casing are welded into an assembly, the interference fit or clearance fit between the stator and the lower casing can offset the positional deviation caused by welding, thereby ensuring the positional accuracy of the stator and the rotor, and further improving the air gap between the stator and the rotor. uniformity.

Steps can also be made on the inner wall of the casing by machining, so that the stator can ensure a certain position accuracy.

The motor and the compressor proposed by the utility model belong to the same inventive concept as the stator fixing structure of the motor, and therefore, they have the same beneficial effects.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," or "specific example," etc., means a specific feature, structure, material, or characteristic described in connection with the embodiment or example. Included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in one or more embodiments. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

The above are only the preferred embodiments of the present invention, and do not have any limiting effect on the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed by the present invention. The content of the technical solution still falls within the protection scope of the present invention.

Claims (10)

1. A motor stator fixing structure is characterized in that a motor comprises a shell and a stator, wherein an accommodating space is formed in the shell, and the stator is arranged in the accommodating space;

the stator is provided with a stator outer wall, the shell is provided with a shell inner wall, the shape and size of the stator outer wall are matched with those of the shell inner wall, the stator outer wall is sleeved in the shell inner wall, and the shell inner wall and the stator outer wall are connected in a welding mode and in interference fit or clearance fit;

the shell comprises an upper shell and a lower shell, and the upper shell and the stator are fixedly connected in a welding mode to form a first assembly;

the first component is connected with the lower shell through interference fit or clearance fit.

2. The stator fixing structure of the motor according to claim 1, wherein the welding means includes laser welding, gas-shielded welding or brazing.

3. The stator fixing structure of the motor according to claim 1, wherein the welding has a penetration depth larger than a thickness of the case.

4. The stator fixing structure of the motor according to claim 1, wherein the interference of the interference fit is 0mm to 0.1mm, or the clearance of the clearance fit is 0mm to 0.3 mm.

5. The stator fixing structure of the motor according to claim 1, wherein a protrusion is provided on an inner wall of the lower case, and one end of the stator is coupled to the protrusion.

6. The stator fixing structure of the motor according to claim 5, wherein the protrusion is a step.

7. The stator fixing structure of the motor according to claim 6, wherein the step has a height of 0.1mm to 2 mm.

8. The stator fixing structure of the motor according to claim 1, wherein the housing further has a connecting portion, the connecting portion is a connecting portion between the upper housing and the lower housing, and the upper housing and the lower housing are fixedly connected at the connecting portion by the welding method.

9. An electric motor comprising the motor stator fixing structure according to any one of claims 1 to 8.

10. A compressor, characterized by comprising an electric machine according to claim 9.

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