CN111953094A

CN111953094A - Motor compressor stator fixed knot constructs and motor compressor

Info

Publication number: CN111953094A
Application number: CN201910411093.XA
Authority: CN
Inventors: 黄波; 汤轶群; 孟祥麒; 赵凤荣
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-11-17

Abstract

The invention provides a motor compressor stator fixing structure and a motor compressor, wherein a motor is arranged in the motor compressor, the motor comprises a motor shell and a motor stator, the motor shell comprises an inner surface, the motor stator comprises an outer surface, a connecting inner wall is arranged on the inner surface of the motor shell, a connecting outer wall is arranged on the outer surface of the motor stator, the shape and size of the connecting inner wall are matched with those of the connecting outer wall, when the motor stator is arranged in the motor shell, the connecting outer wall is sleeved in the connecting inner wall, and the connecting inner wall is in clearance fit with the connecting outer wall and is fixedly connected with the connecting outer wall through. The embodiment of the invention reduces the motor efficiency reduction caused by radial pressure stress borne by the stator, improves the stator and rotor assembly precision, improves the uniformity of the stator and rotor air gaps, and reduces the noise.

Description

Motor compressor stator fixed knot constructs and motor compressor

Technical Field

The invention relates to the field of electric compressors of refrigeration equipment such as air conditioners, refrigerators and the like, in particular to a stator fixing structure of an electric compressor and the electric compressor with the stator fixing structure.

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.

As shown in fig. 1, in conventional hermetic motor compressors, a motor stator 1 and a motor housing 2 are fixed in a shrink fit manner, and due to the shrink fit process, an air gap between a motor stator and a motor rotor is not uniform even if fixed by a fixture, and the motor stator 1 is subjected to radial compressive stress, which results in increased iron loss and reduced motor efficiency.

For this reason, those skilled in the art have made efforts to develop a stator fixing structure that reduces the efficiency degradation of the motor caused by the radial pressure force applied to the stator and improves the assembling accuracy of the stator and the rotor.

Therefore, the invention provides a novel stator fixing structure of an electric compressor and a compressor with the same.

Disclosure of Invention

The invention aims to provide a stator fixing structure of an electric compressor and a compressor with the stator fixing structure, which can reduce the reduction of motor efficiency caused by radial pressure stress borne by a stator, improve the assembly precision of the stator and a rotor, improve the uniformity of air gaps of the stator and the rotor and reduce noise.

According to one aspect of the invention, a motor is arranged in the motor compressor, the motor comprises a motor shell and a motor stator, the motor shell comprises an inner surface, the motor stator comprises an outer surface, a connecting inner wall is arranged on the inner surface of the motor shell, a connecting outer wall is arranged on the outer surface of the motor stator, the shape and size of the connecting inner wall are matched with those of the connecting outer wall, when the motor stator is arranged in the shell, the connecting outer wall is sleeved in the connecting inner wall, and the connecting inner wall and the connecting outer wall are in clearance fit and are fixedly connected through glue joint.

Preferably: still be equipped with the arch on motor casing's the connection inner wall, work as motor stator locates when in the casing, motor stator's one end with the arch is connected.

Preferably: the bulge on the connecting inner wall of the motor shell is a step, a clamp spring or a stop block.

Preferably: the bulge on the connecting inner wall of the motor shell is formed by integral molding or welding or assembling and fixing.

Preferably: the height of the bulge on the connecting inner wall of the motor shell is 0.1mm-1 mm.

Preferably: when the motor stator is arranged in the shell, the unilateral gap between the connecting outer wall and the connecting inner wall is 0.01mm-0.5 mm.

Preferably: the motor stator is made of electrical steel.

Preferably: the motor housing is made of carbon steel.

Preferably: the connecting outer wall and the connecting inner wall are in the shape of cylinders which are matched with each other.

According to another aspect of the present invention, there is also provided a compressor including the motor-driven compressor stator fixing structure according to any one of the above.

According to the stator fixing structure of the electric compressor and the compressor with the stator fixing structure, after the motor stator hot jacket is fixed on the shell in an adhering mode instead of a gluing mode, the reduction of motor efficiency caused by radial pressure stress borne by the stator can be reduced, the stator and rotor assembly precision is improved, the uniformity of air gaps of the stator and the rotor is improved, and noise is reduced.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

Fig. 1 is a sectional view of an internal connection structure of a stator fixing structure of a related art motor-driven compressor;

fig. 2 is an internal structural schematic view of a stator fixing structure of an electric compressor of embodiment 1 of the present invention;

fig. 3 is an internal structural view of a stator fixing structure of an electric compressor according to embodiment 2 of the present invention.

Reference numerals

1 prior art Motor stator

2 Motor housing of the prior art

3 Motor casing

31 inner surface of motor housing

32 connecting inner wall

33 convex

4 electric machine stator

41 outer surface of motor stator

42 connecting the outer walls

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

As shown in fig. 2 to 3, in an embodiment of the present invention, there is provided a stator fixing structure of an electric compressor and a compressor having the same, in which a motor is provided in the electric compressor, and the motor includes a motor housing 3 and a motor stator 4.

The motor housing 3 includes an inner surface 31. The motor stator 4 comprises an outer surface 41.

The motor housing 3 is provided on its inner surface with a coupling inner wall 32. The outer surface of the motor stator 4 is provided with a connecting outer wall 42.

The connecting inner wall 32 is sized and shaped to match the connecting outer wall 42.

When the motor stator 4 is arranged in the motor housing 3, the connecting outer wall 42 is sleeved in the connecting inner wall 32, and the connecting inner wall 32 and the connecting outer wall 42 are in clearance fit and are fixedly connected through glue joint, namely, through glue water.

The mating connection between the motor stator 4 and the motor housing 3 is similar to the mating connection of a shaft to a shaft connector. The matching mode between the shaft and the connecting piece on the shaft is three, namely: three tolerance fits of interference, transition and clearance. The prior art of thermal sleeve fit is a method for achieving the purpose of interference fit by using the principle of expansion with heat and contraction with cold. The purpose of achieving this interference shrink fit can also be achieved by pressing, which is to achieve an interference fit with pressure at room temperature, using tight tolerances. However, such pressing tends to cause the motor stator 4 to be subjected to radial compressive stress, resulting in increased iron loss and reduced motor efficiency.

Therefore, the stator fixing structure of the electric compressor and the electric compressor change the motor stator thermal sleeve into glue joint and fix the motor stator thermal sleeve on the shell, can reduce the motor efficiency reduction caused by radial pressure stress born by the stator, improve the stator and rotor assembly precision, improve the uniformity of the stator and rotor air gap and reduce the noise.

As shown in fig. 2, in the embodiment of the present invention, the motor stator 4 is sleeved in the motor housing 3 and is fixedly connected to the inner wall of the motor housing 3.

The matching of the shape and the size of the connecting inner wall 32 and the shape and the size of the connecting outer wall 42 means that the shape of the connecting inner wall 32 on the outer surface of the motor stator 4 is identical to the shape of the connecting outer wall 42 on the inner surface of the motor shell 3, and the sizes are suitable, so that when the motor stator 4 is sleeved on the inner wall of the motor shell 3, a gap-stable clearance fit is formed between the connecting inner wall 32 on the outer surface of the motor stator 4 and the connecting outer wall 42 on the inner surface of the motor shell 3, and the circumferential consistency of the glue amount is ensured under better dimensional accuracy.

As shown in fig. 2, in the embodiment of the present invention, the glue used for the clearance fit between the inner connecting wall 32 and the outer connecting wall 42 and the fixed connection by gluing is high-strength glue, so that the fixing strength between the motor stator 4 and the motor housing 3 is greater than 1KN in the radial direction, greater than 4KN in the axial direction, and greater than 1KN in the axial direction.

Because the compressor mounting means is vertical, motor stator 4 is the direction of gravity for the main atress direction when the installation, therefore radial fixation can adopt the mode that the high strength glued is glued and is glued for 4 surfaces of motor stator do not produce radial compressive stress, and the fixed strength that preferred glue reaches is radially being greater than 1KN, and preferred glue can bear gravity in the axial simultaneously, and the fixed strength that preferred glue and arch reached is axially downwards being greater than 4 KN.

In the embodiment of the invention, the glue is various glues which can ensure certain strength and do not generate compatible reaction with the refrigerant and the refrigerating machine oil.

In addition, in the embodiment of the present invention, it is preferable that the material of the motor stator 4 is electrical steel, which is also called silicon steel sheet, is an important soft magnetic alloy indispensable for the power, electronic and military industries, and 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 3 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.

As shown in fig. 2, in the embodiment of the present invention, it is preferable that the gap between the coupling outer wall 42 and the coupling inner wall 32 is 0.01mm to 0.5mm when the motor stator 4 is provided in the motor housing 3. And preferably 0.05-0.1mm, and under the better dimensional accuracy, when the circumferential consistency of the glue amount is ensured, the assembly accuracy of the stator and the rotor can be improved, and the uniformity of the air gaps of the stator and the rotor can be improved.

As shown in fig. 3, in the embodiment of the present invention, it is preferable that the coupling inner wall 32 of the motor housing 3 is further provided with a projection 33. And preferably the projections 33 are looped around the coupling inner wall 32 of the motor housing 3.

When motor stator 4 is located in motor casing 3, motor stator 4's one end is connected with arch 33, and when motor stator 4 cover was located in motor casing 3 promptly, motor stator 4's one end was placed in on arch 33 to fix motor stator 4's position in the axial.

As shown in fig. 3, in the embodiment of the present invention, it is preferable that the projection 33 on the coupling inner wall 32 of the motor housing 3 is a step, a snap spring, or a stopper.

When the projection 33 is a step, the projection 33 and the motor housing 3 are integrally formed. The integral molding in the present invention means that the motor housing 3 itself is directly formed or formed by machining without additionally installing or providing other components on the motor housing 3.

As shown in fig. 3, in the embodiment of the present invention, the inner diameter of the motor housing 3 is preferably stepped by machining. The step allows the motor stator 4 to be axially fixed when the motor stator 4 is inserted into the motor housing 3.

When the protrusion 33 is a snap spring, the snap spring is fixedly connected to the connecting inner wall 32 of the motor housing 3 through a groove or directly. The clamp spring, also called a retainer ring or a retaining ring, belongs to one type of fastener, is arranged in a shaft groove or a hole groove of a machine or equipment and plays a role in preventing parts on a shaft or a hole from moving axially.

When the protrusion 33 is a stopper, it is fixed to the connecting inner wall 32 of the motor housing 3 by welding or other means, and blocks the axial movement of the motor stator 4.

As shown in fig. 3, in the embodiment of the present invention, it is preferable that the height of the projection 33 on the coupling inner wall 32 of the motor housing 3, that is, the longest vertical length of the projection 33 with respect to the coupling inner wall 32 is 0.1mm to 1mm, and preferably 0.5mm to 1 mm.

The invention is described below with reference to specific embodiments and with reference to the attached drawings:

example 1

As shown in figure 2, the motor compressor stator fixing structure and the motor compressor with the same are provided with a motor in the motor compressor, wherein the motor comprises a motor shell 3 and a motor stator 4.

The motor housing 3 is provided on its inner surface with a coupling inner wall 32. The outer surface of the motor stator 4 is provided with a connecting outer wall 42. The connecting inner wall 32 is sized and shaped to match the connecting outer wall 42.

When the motor stator 4 is arranged in the motor 3, the connecting outer wall 42 is sleeved in the connecting inner wall 32, and the connecting inner wall 32 and the connecting outer wall 42 are in clearance fit and are fixedly connected through glue joint, namely, through glue water.

Example 2

As shown in fig. 3, a stator fixing structure of an electric compressor and an electric compressor with the same are provided, wherein a motor is arranged in the electric compressor and comprises a motor shell 3 and a motor stator 4.

The coupling inner wall 32 of the motor housing 3 is also provided with a stepped projection 33 formed by machining.

When the motor stator 4 is arranged in the motor housing 3, the connecting outer wall 42 is sleeved in the connecting inner wall 32, the connecting inner wall 32 and the connecting outer wall 42 are in clearance fit and are fixedly connected through glue, and one end of the motor stator 4 is arranged on the step-shaped bulge 33, so that the position of the motor stator 4 is fixed in the axial direction.

In summary, according to the stator fixing structure of the electric compressor and the compressor with the stator fixing structure, the motor stator thermal sleeve is fixed on the shell in a gluing mode instead of a gluing mode, so that the reduction of motor efficiency caused by radial pressure stress borne by the stator can be reduced, the stator and rotor assembly precision is improved, the uniformity of air gaps of the stator and the rotor is improved, and noise is reduced.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A stator fixing structure of an electric compressor is characterized in that a motor is arranged in the electric compressor, the motor comprises a motor housing (3) and a motor stator (4), the motor housing (3) comprising an inner surface (31), the motor stator (4) comprises an outer surface (41), a connecting inner wall (32) is arranged on the inner surface (31) of the motor shell (3), a connecting outer wall (42) is arranged on the outer surface (41) of the motor stator (4), the shape and the size of the connecting inner wall (32) are matched with the shape and the size of the connecting outer wall (42), when the motor stator (4) is arranged in the motor shell (3), the connecting outer wall (42) is sleeved in the connecting inner wall (32), the connecting inner wall (32) and the connecting outer wall (42) are in clearance fit and fixedly connected through gluing.

2. The motor-compressor stator fixing structure according to claim 1, wherein: still be equipped with arch (33) on the connection inner wall (32) of motor casing (3), when motor stator (4) are located in motor casing (3), the one end of motor stator (4) with arch (33) are connected.

3. The motor-compressor stator fixing structure according to claim 2, wherein: the bulge (33) on the connecting inner wall (32) of the motor shell (3) is a step, a clamp spring or a stop block.

4. The motor-compressor stator fixing structure according to claim 2, wherein: the bulge (33) on the connecting inner wall (32) of the motor shell (3) is formed by integral molding or welding and fixing.

5. The motor-compressor stator fixing structure according to claim 2, wherein: the height of the bulge (33) on the connecting inner wall (32) of the motor shell (3) is 0.1mm-1 mm.

6. The motor-compressor stator fixing structure according to claim 1, wherein: when the motor stator (4) is arranged in the motor shell (3), the unilateral gap between the connecting outer wall (42) and the connecting inner wall (32) is 0.01mm-0.5 mm.

7. The motor-compressor stator fixing structure according to claim 1, wherein: the motor stator (4) is made of electrical steel.

8. The motor-compressor stator fixing structure according to claim 1, wherein: the motor housing (3) is made of carbon steel.

9. The motor-compressor stator fixing structure according to claim 1, wherein: the connecting outer wall (42) and the connecting inner wall (32) are in the shape of cylinders which are matched with each other.

10. A motor-driven compressor comprising a motor-driven compressor stator fixing structure according to any one of claims 1 to 9.