CN212114975U - Motor stator fixed knot constructs and motor and compressor - Google Patents

Abstract

The utility model discloses a motor stator fixed knot constructs and motor and compressor utilizes fixed stator of welding mode and casing, can reduce the motor efficiency decline that the stator atress leads to improve stator and rotor assembly precision, improve the homogeneity of stator and rotor air gap, noise reduction. With the fixed of gluing of stator among the prior art, utilize the fixed efficiency of welding mode higher, the operability is more simple and convenient. Additionally, the technical scheme of the utility model any additional technology is not fixed and is increased for the stator, and when the welding casing, the welding mode uses laser welding, utilizes laser welding to have the little thermal characteristics of big penetration, can be in the same place casing and stator are fixed simultaneously.

Description

Motor stator fixed knot constructs and motor and compressor

Technical Field

The utility model belongs to the technical field of refrigeration plant's such as air conditioner, refrigerator motor compressor field and specifically relates to a motor stator fixed knot constructs and motor and compressor.

Background

The compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of a refrigeration system. The refrigerating cycle is powered by sucking low-temperature and low-pressure refrigerant gas from the air suction pipe, driving the piston to compress the refrigerant gas through the operation of the motor, and discharging high-temperature and high-pressure refrigerant gas to the exhaust pipe. The totally-enclosed refrigeration compressor is a core component of a refrigeration system, and a compression mechanism and a motor are usually arranged in a shell which is welded by fusion welding or brazing and share a main shaft, so that a shaft seal device is omitted, and the size and the weight of the whole compressor are greatly reduced. The outer surface of the shell is only welded with a suction and exhaust pipe, a process pipe and other necessary pipelines (such as a spray pipe), an input power supply wiring terminal, a compressor bracket and the like. However, since the whole compression mechanism and the motor unit are installed in a sealed casing which cannot be disassembled and are not easy to open for internal repair, the compressor is required to have high use reliability, long service life and high installation requirement on the whole refrigeration system, and the totally-enclosed structure is generally used in the small-cooling-capacity refrigeration compressor which is produced in large scale.

Referring to fig. 1, fig. 1 shows a fixing method of a motor stator in a conventional hermetic motor compressor, which adopts a method of fixing the motor stator 1 and a motor housing 2 in a shrink fit manner, and due to the shrink fit process, even if an air gap between the motor stator and the motor rotor is fixed by a fixture, the air gap between the motor stator and the motor rotor is not uniform, and the motor stator 1 is subjected to radial compressive stress, which causes iron loss and decreases motor efficiency. The existing closed type electric compressor adopts a mode of fixing a motor stator and a shell by a shrink fit, and due to the shrink fit process, the phenomenon of uneven air gaps of a stator and a rotor can also occur even if the air gaps of the stator and the rotor of the motor are fixed by a clamp, and the stator electrical steel is caused to generate stress, so that the motor efficiency is influenced.

Referring to fig. 2, a stator fixing structure of an electric compressor is also proposed in the prior art, in which a stator thermal sleeve of a motor is fixed to a housing by bonding, so that a decrease in motor efficiency caused by radial pressure applied to the stator can be reduced, stator and rotor assembly accuracy can be improved, uniformity of air gaps between the stator and the rotor can be improved, and noise can be reduced. The technical scheme in fig. 2 is used for solving the problem of the air gap precision of the stator and the rotor, but the inventor finds that the operation is complex and the production efficiency is low due to the fact that the air gap precision of the stator and the rotor is fixed by gluing in specific practical application.

Therefore, it is necessary to provide a solution that can improve the production efficiency.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a motor stator fixed knot constructs and motor and compressor for solve and operate comparatively complicacy among the prior art, the lower problem of production efficiency.

In order to solve the technical problem, the utility model provides a motor stator fixing structure, the motor includes casing and stator, a holding space has in the casing, the stator sets up in the holding space, the stator has an outer wall, the casing has an inner wall, the shape size of outer wall matches with the shape size of inner wall, the outer wall cover is established in the inner wall, through welding mode and interference fit or clearance fit fixed connection between inner wall and the outer wall;

the shell comprises an upper shell and a lower shell, and the lower shell is connected with the stator through the interference fit or the clearance fit to form a first assembly;

the first assembly is fixedly connected with the upper shell in a welding mode.

Optionally, the welding means comprises laser welding.

Optionally, the penetration of the laser weld is greater than the thickness of the shell.

Optionally, 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, the lower housing and the stator are fixedly connected at the connecting portion by welding.

Optionally, the interference of the interference fit is 0mm to 0.1mm, or the clearance of the clearance fit is 0mm to 0.1 mm.

Optionally, a protruding portion is disposed on an inner wall of the lower housing, and one end of the stator is connected to the protruding portion.

Optionally, the protrusion is a step.

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

Based on the same inventive concept, the utility model discloses still provide a motor, including any one of the motor stator fixed knot structure in the above-mentioned feature description.

Based on the same inventive concept, the utility model discloses still provide a compressor, include the motor.

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

the utility model provides a motor stator fixed knot constructs utilizes fixed stator of welding mode and casing, can reduce the motor efficiency decline that the stator atress leads to improve stator and rotor assembly precision, improve the homogeneity of stator and rotor air gap, noise reduction. With the fixed of gluing of stator among the prior art, utilize the fixed efficiency of welding mode higher, the operability is more simple and convenient.

Additionally, the technical scheme of the utility model any additional technology is not fixed and is increased for the stator, and when the welding casing, the welding mode uses laser welding, utilizes laser welding to have the little thermal characteristics of big penetration, can be in the same place casing and stator are fixed simultaneously.

The utility model provides a motor and compressor, with motor stator fixed knot constructs belongs to same invention concept, consequently, it has the same beneficial effect.

Drawings

Fig. 1 is a schematic view illustrating a fixing manner of a motor stator in a hermetic type electric compressor in the related art;

FIG. 2 is a schematic view of a stator fixing structure of a motor-driven compressor in the prior art;

fig. 3 is a schematic view of an internal structure of a motor stator fixing structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of the internal structure of FIG. 3 after being fixed by welding;

10-shell, 11-upper shell, 12-lower shell, 100-inner wall, 101 connecting part, 20-stator, 200-outer wall, 30-convex part.

Detailed Description

The following description of the embodiments of the present invention will be described in more detail with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

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

Referring to fig. 3 and 4, an embodiment of the present invention provides a fixing structure for a motor stator 20, the motor includes a housing 10 and a stator 20, an accommodating space is provided in the housing 10, the stator 20 is disposed in the accommodating space, the stator 20 has an outer wall 200, the housing 10 has an inner wall 100, the outer wall 200 is matched with the inner wall 100, the outer wall 200 is sleeved in the inner wall 100, and the inner wall 100 is fixedly connected with the outer wall 200 through a welding manner and an interference fit or a clearance fit. The housing 10 includes an upper housing 11 and a lower housing 12, and the lower housing 12 and the stator 20 are connected by the interference fit or the clearance fit and form a first assembly; the first component and the upper shell 11 are fixedly connected through the welding mode. In specific implementation, the lower housing 12 and the stator 20 are connected by interference fit or clearance fit, at this time, the lower housing 12 and the stator 20 form a first assembly, the upper housing is sleeved on the first assembly, the first assembly is fixedly connected with the lower housing by a welding method, and finally, the stator 20 is fixedly connected with the housing 10 by a welding method.

Different from the prior art, the embodiment of the utility model provides a motor stator 20 fixed knot constructs, utilizes welding mode fixed stator 20 and casing 10, can reduce the motor efficiency decline that stator 20 atress leads to improve stator and rotor assembly precision, improve the homogeneity of stator and rotor air gap, noise abatement. With the fixed glueing of stator 20 among the prior art, utilize the fixed efficiency of welding mode higher, the operability is more simple and convenient.

Preferably, the welding mode can utilize laser welding, and it should be noted that, the technical scheme of the embodiment of the present invention does not add any additional process for stator 20 is fixed, and when welding casing 10, the welding mode uses laser welding, and the utilization of laser welding has the advantage of large penetration and small heat, and can fix casing 10 and stator 20 together simultaneously. The laser welding is fusion welding. Fusion welding is a welding method in which metals at a joint are melted by high temperature or the like during welding, and a strong welded joint can be formed. Because the welded workpieces are closely attached together, under the action of a temperature field, gravity and the like, no pressure is applied, and molten liquid melted by the two workpieces can be mixed. After the temperature is reduced, the melting part is condensed, and the two workpieces are firmly welded together, thus completing the welding method. A heat affected zone is created in the weld area due to the high temperature phase transformation process inherent in the welding process. It is understood that in other embodiments, other types of welding manners may be selected, for example, arc welding, gas welding, electroslag welding, electron beam welding, or plasma welding may also be selected, and many other types of welding manners are also available, which are not described herein in detail.

Further, the penetration depth of the laser welding is larger than the thickness of the housing 10, and by setting the penetration depth of the laser welding to be larger than the thickness of the housing 10, it is further ensured that the housing 10 and the stator 20 are fixed together at the same time.

Specifically, please refer to fig. 3 and 4, wherein fig. 3 is a schematic view of the stator 20 after being pre-fixed in the housing 10 and then being assembled as a whole, and fig. 4 is a schematic view of the housing 10 and the motor after being welded. The housing 10 includes an upper housing 11 and a lower housing 12, the housing 10 further includes a connecting portion 101, the connecting portion 101 is a connection portion between the upper housing 11 and the lower housing 12, and the upper housing 11, the lower housing 12 and the stator 20 are fixedly connected to the connecting portion 101 by welding. By setting the fixing manner of the stator 20 and the upper housing 11 and the lower housing 12 as laser welding, the upper housing 11, the lower housing 12 and the stator 20 can be fused together by laser welding without adding any additional process for fixing the stator 20. The efficiency of utilizing the welding mode to fix is higher, and the operability is more simple and convenient.

The stator 20 is sleeved in the housing 10 and is fixedly connected to the inner wall 100 of the housing 10. The shape and size of the inner wall 100 and the outer wall 200 are matched, that is, the shape and size of the outer surface of the stator 20 are matched with the shape and size of the inner surface of the housing 10, so that when the stator 20 is sleeved on the inner wall 100 of the housing 10, a stable clearance fit or an interference fit with a proper interference magnitude can be formed between the outer surface of the stator 20 and the inner surface wall of the housing 10. In the embodiment of the present invention, when the stator 20 is disposed in the housing 10, if a clearance fit is used, the clearance between the outer wall 200 and the inner wall 100 is 0mm to 0.1mm, and preferably 0.1 mm; if an interference fit is used, the interference between the outer wall 200 and the inner wall 100 is 0mm to 0.1mm, and preferably 0.1 mm. 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 is improved.

Referring to fig. 3 and 4, in the embodiment of the present invention, the inner wall 100 and the outer wall 200 are in clearance fit or interference fit and fixedly connected by welding, and the welding method adopted is laser welding, so that the fixing strength between the stator 20 and the housing 10 satisfies: greater than 1KN in each direction, i.e. greater than 1KN in the radial direction, greater than 1KN axially downward, and greater than 1KN axially upward. Because the compressor mounting mode is vertical, and the main atress direction of motor stator 20 is the gravity direction when the installation, therefore radial fixation can adopt the welding mode for stator 20 surface does not produce radial compressive stress, preferred welding mode selects for use laser welding in order to guarantee stator 20 with the fixed intensity between the casing 10 all is greater than 1KN in all directions.

In addition, in the embodiment of the present invention, it is preferable that the material of the stator 20 is electrical steel, which is also called silicon steel sheet, and the english name is silicon plating, which is a silicon iron soft magnetic alloy with very low carbon content, and generally contains 0.5 to 4.5% of silicon. The addition of silicon can improve the resistivity and the maximum magnetic conductivity of iron, and reduce the coercive force, the iron core loss (iron loss) and the magnetic aging. The electrical steel is an important soft magnetic alloy indispensable to the power, electronic and military industries, is also a metal functional material with the largest yield, and is mainly used as iron cores of various motors, generators and transformers. The material of the motor shell 10 is preferably carbon steel, the carbon steel is iron-carbon alloy with carbon content of 0.0218% -2.11%, also called carbon steel, and generally contains a small amount of silicon, manganese, sulfur and phosphorus, and generally the carbon content in the carbon steel is higher, the hardness is higher, and the strength is higher. Preferably, the material of the shell 10 is carbon steel, and the carbon steel is iron-carbon alloy with carbon content of 0.0218% -2.11%. Also called carbon steel. Generally, the catalyst also contains small amounts of silicon, manganese, sulfur and phosphorus. Generally, the higher the carbon content in the carbon steel, the higher the hardness and 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 are of various types in different grades, and the types are selected according to actual needs in specific implementation, which is not described herein.

Referring to fig. 3 and 4, in the embodiment of the present invention, it is preferable that a protrusion 30 is further disposed on the inner wall 100 of the housing 10. And preferably the protrusion 30 circles around the inner wall 100 of the housing 10. Referring to fig. 3, when the stator 20 is disposed in the housing 10, one end of the stator 20 is connected to the protrusion, that is, when the stator 20 is sleeved in the housing 10, one end of the stator 20 is disposed on the protrusion 30, so as to fix the position of the stator 20 in the axial direction. In the embodiment of the present invention, it is preferable that the protrusion 30 on the inner wall 100 of the housing 10 is a step, a snap spring, or a stopper.

When the protrusion 30 is a step, the protrusion 30 and the housing 10 are integrally formed. The integrated molding in the present invention means that the housing 10 itself is directly formed or formed by processing, and it is not necessary to additionally install or set other components on the housing 10. When the protrusion 30 is provided as a step, it may be preferably implemented because it has an advantage in that it is not required to additionally mount or provide other components on the housing 10.

Referring to fig. 3 and 4, in the embodiment of the present invention, the inner diameter of the motor housing 10 is preferably stepped by machining. The step serves to axially fix the motor stator 20 when the motor housing 10 is fitted with the motor stator 20. The height of the step is preferably 0.1mm-2 mm.

In other embodiments, the projection 30 may also be a snap spring, which may be fixedly connected to the inner connecting wall 100 of the motor housing 10 via a groove or directly. The utility model discloses jump ring, also can be called retaining ring or buckle belongs to one kind of fastener, supplies to adorn in the axle slot or the hole groove of machine, equipment, plays the effect that prevents epaxial or the part axial motion in hole. It is understood that in other embodiments, the raised portion 30 may also be a stop, welded or otherwise secured to the inner connecting wall 100 of the motor housing 10, to stop the axial movement of the motor stator 20.

Based on the same inventive concept, another embodiment of the present invention further provides an electric machine, including the fixing structure of the electric machine stator 20 described in any one of the above feature descriptions.

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

To sum up, the utility model provides a motor stator fixed knot constructs utilizes fixed stator of welding mode and casing, can reduce the motor efficiency decline that the stator atress leads to improve stator and rotor assembly precision, improve the homogeneity of stator and rotor air gap, noise reduction. With the fixed of gluing of stator among the prior art, utilize the fixed efficiency of welding mode higher, the operability is more simple and convenient.

Additionally, the technical scheme of the utility model any additional technology is not fixed and is increased for the stator, and when the welding casing, the welding mode uses laser welding, utilizes laser welding to have the little thermal characteristics of big penetration, can be in the same place casing and stator are fixed simultaneously.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

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

the shell comprises an upper shell and a lower shell, and the lower shell is connected with the stator through the interference fit or the clearance fit to form a first assembly;

the first assembly is fixedly connected with the upper shell in a welding mode.

2. The stator fixing structure of the motor according to claim 1, wherein the welding means includes laser welding.

3. The stator fixing structure of an electric motor according to claim 2, wherein a penetration depth of the laser welding is larger than a thickness of the case.

4. 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 of the upper housing and the lower housing, and the upper housing, the lower housing and the stator are fixedly connected at the connecting portion by the welding method.

5. 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 0.1 mm.

6. 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.

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

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

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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