CN109958623B

CN109958623B - A kind of compressor

Info

Publication number: CN109958623B
Application number: CN201711436655.3A
Authority: CN
Inventors: 陈艳春; 沈孟奇; 陆捷; 倪伟
Original assignee: Shanghai Highly Electrical Appliances Co Ltd
Current assignee: Shanghai Highly Electrical Appliances Co Ltd
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2024-07-02
Anticipated expiration: 2037-12-26
Also published as: CN109958623A

Abstract

The invention provides a compressor. The compressor includes: a housing; a motor assembly housed within the housing, the motor assembly comprising: a rotor and a stator, the stator having a cylindrical region, the rotor disposed within the cylindrical region of the stator and rotatable relative to the stator, the rotor comprising: the rotor core is made of a first material and is provided with a plurality of rotor grooves which are penetrated along the axial direction; a plurality of rotor conductors disposed within the rotor slots; weight plates are arranged on the rotor core and/or below the rotor core in a stacked mode, and are made of a second material, and the density of the second material is greater than that of the first material.

Description

A kind of compressor

Technical Field

The invention relates to the field of refrigeration, in particular to a compressor.

Background

In general, a hermetic compressor includes a motor for generating a driving force in an inner space of a housing, and a compression part coupled to the motor for compressing a refrigerant.

At present, part of countries comprehensively advance the electromagnetic compatibility (EMC) improvement requirement of compressors, the second harmonic needs to meet the authentication requirement, and part of compressors find that the electromagnetic compatibility (EMC) does not meet the requirement in the electromagnetic compatibility (EMC) detection process.

The root cause of harmonic generation is due to nonlinear loading. When current flows through the load, a non-sinusoidal current is formed that is not linear with the applied voltage, thereby creating harmonics. The harmonic current creates a harmonic voltage drop across the grid impedance, causing the voltage waveform to deviate from a sine wave. The harmonic current vectors from different harmonic sources are greatly damaged after being added, and the transient effect is due to the deviation of the zero-crossing moment of the voltage waveform, so that the equipment is in control failure and malfunction, and the long-term effect is mainly heating but not doing work, so that the capacitor and the rotating motor are aged prematurely and even damaged.

In order to inhibit the second harmonic from exceeding the standard, a pump body can be changed into a double-rotor mode, a motor winding is changed and the like, but if the pump body is changed into the double-rotor mode, the realization cost is higher; if the motor winding is changed, the electromagnetic force is changed and the desired effect is not necessarily produced. Therefore, these methods are not ideal.

Disclosure of Invention

In view of the drawbacks of the prior art, an object of the present invention is to provide a compressor. The compressor can inhibit instability in the running process of the compressor, improve electromagnetic compatibility (EMC), does not influence the performance and reliability of the compressor, and has lower realization cost.

According to an aspect of the present invention, there is provided a compressor including: a housing; a motor assembly housed within the housing, the motor assembly comprising: a rotor and a stator, the stator having a cylindrical region, the rotor disposed within the cylindrical region of the stator and rotatable relative to the stator, the rotor comprising: the rotor core is made of a first material and is provided with a plurality of rotor grooves which are penetrated along the axial direction; a plurality of rotor conductors disposed within the rotor slots; weight plates are arranged on the rotor core and/or below the rotor core in a stacked mode, and are made of a second material, and the density of the second material is greater than that of the first material.

Preferably, the weight of the rotor at least includes the sum of the weight of the rotor core, the weight of all the rotor conductors, and the weight of the weight plates, and the ratio between the weight of the rotor and the inner diameter of the housing is 0.016 kg/mm or more and less than 0.02 kg/mm.

Preferably, the rotor further comprises an upper counterweight and a lower counterweight, the upper counterweight is arranged above the weighting piece or the rotor core, and the lower counterweight is arranged below the weighting piece or the rotor core, wherein the weight of the rotor further comprises the weight of the upper counterweight and the weight of the lower counterweight.

Preferably, the upper balance weight and/or the lower balance weight are integrally formed with the weighting piece.

Preferably, the first material is silicon steel, and the second material is any one of copper, cadmium copper or high manganese copper.

Preferably, the rotor core includes a plurality of silicon steel sheets that set up along the axial range upon range of, the weight piece is the copper sheet, the copper sheet sets up in a plurality of the top of silicon steel sheet and/or a plurality of the below of silicon steel sheet, wherein, the copper sheet perpendicular to the shape and the size of the cross-section of axial is the same with the silicon steel sheet.

Preferably, the copper sheet is riveted with a plurality of the silicon steel sheets.

Preferably, the ratio between the inner diameter of the rotor and the outer diameter of the rotor is equal to or less than 0.344.

Preferably, the ratio between the outer diameter of the rotor and the inner diameter of the housing is 0.5 or more.

Preferably, the cross section of the weight-increasing sheet perpendicular to the axial direction is circular, the total weight of the weight-increasing sheet is 0.09 kg, the total thickness is 3mm, and the total weight of the rotor is 1.974 kg.

The embodiment of the invention increases the weight of the rotor of the motor assembly, so that the ratio between the weight of the rotor and the inner diameter of the shell is more than or equal to 0.016 kg/mm, thereby increasing the moment of inertia in the rotating process of the rotor, further inhibiting the instability (second harmonic) in the running process of the compressor, improving the electromagnetic compatibility (EMC) and enabling the electromagnetic compatibility (EMC) to meet the detection requirement. In addition, in the embodiment of the invention, as the rotor weight is increased by arranging the copper sheets on the silicon steel sheets and/or below the silicon steel sheets, the method is realized in a limited space inside the compressor shell, and meanwhile, the influence on the stress of the crankshaft is avoided, so that the reliability of the compressor is effectively ensured.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of a compressor according to an embodiment of the present invention; and

Fig. 2 is a schematic structural view of a rotor of a motor assembly of a compressor according to an embodiment of the present invention.

Reference numerals

1. Shell body

3. Motor assembly

31. Crankshaft

32. Rotor

321. Rotor core

323. Weight increasing tablet

35. Upper balance weight

36. Lower balance weight

4. First bearing

51. Cylinder

52. Rotary piston

53. Blade

6. Second bearing

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail. While the invention will be described and illustrated in conjunction with certain specific embodiments, it will be understood that it is not intended to limit the invention to these embodiments alone. On the contrary, the invention is intended to cover modifications and equivalent arrangements included within the scope of the appended claims.

In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and components have not been described in detail in order to not obscure the present invention.

Referring to fig. 1 and 2, a schematic cross-sectional structure of a compressor and a schematic structure of a rotor according to an embodiment of the invention are shown. In the preferred embodiment of the invention shown, the compressor comprises a housing 1, and a motor assembly 3 is housed within the housing 1. Specifically, the motor assembly 3 includes a rotor 32 and a stator 33 that are sleeved on the crankshaft 31. The stator 33 is fixed to the housing 1. The stator 33 has a cylindrical region a, and the rotor 32 is inserted into the stator 33 in the cylindrical region a. There is a predetermined gap between the rotor 32 and the stator 33, thereby allowing the rotor 32 to rotate relative to the stator 33 through interaction with the stator 33. The crankshaft 31 is coupled to the rotor 32 to transmit a rotational force of the rotor 32 into the compression member to compress the refrigerant. As shown in fig. 1 and 2, an upper portion of the crankshaft 31 is positioned at a central axis of the housing by means of an upper support assembly. The lower part of the crankshaft 31 is positioned at the central axis of the housing 1 by means of the first bearing 4 and the second bearing 6.

The compression member is accommodated in the housing 1. Specifically, the compression member includes: a cylinder 51, a rotary piston 52, a vane 53 for partitioning high and low pressure chambers in the cylinder 51, and a first bearing 4 and a second bearing 6 for defining a compression space together with the cylinder 51 and supporting the crankshaft 31.

The first bearing 4, the second bearing 6 and the cylinder 51 are positioned at one side of the motor 3 to support the crankshaft 31, the first bearing 4 and the second bearing 6 are respectively disposed at both ends of the cylinder 51, and the first bearing 4 is positioned at one end of the cylinder 51 near the motor assembly 3. The first bearing 4 includes a boss 41, the boss 41 protrudes toward the motor 3, and the first bearing 4 constitutes a friction pair with the crankshaft 31 through the boss 41. In the embodiment shown in fig. 1 and 2, the first bearing 4, the second bearing 6 and the cylinder 51 are located below the motor 3. The first bearing 4 is provided at the upper end of the cylinder 51, and the second bearing 6 is provided at the lower end of the cylinder 51.

The rotary piston 52 and the vane 53 are disposed in the compression space defined by the cylinder 51 and the first and second bearings 4 and 6. Wherein the rotary piston 52 is provided on the crankshaft 31, rotates with the crankshaft 31, and the vane 53 is located in a vane groove (not shown in the drawing) and abuts against the rotary piston 52.

In order to solve the problems of unsatisfactory electromagnetic compatibility (EMC) and excessive second harmonic existing in the prior art, and adapt to the existing compressor without making larger changes to the existing compressor, the weight of the rotor 32 of the motor assembly 3 of the compressor is increased, and the moment of inertia in the rotation process of the rotor 32 is increased in the embodiment of the invention, so as to save the cost. In the embodiment of the present invention, the ratio between the weight of the rotor 32 and the inner diameter of the housing 1 is 0.016 kg/mm or more and less than 0.02 kg/mm. After the study by the inventors, it was found that the second harmonic can be effectively suppressed when the ratio between the weight of the rotor 32 and the inner diameter of the housing 1 is 0.016 kg/mm or more and less than 0.02 kg/mm.

Specifically, as shown in fig. 2, the rotor 32 includes a rotor core 321 and a plurality of rotor conductors. The rotor core 321 is made of a first material, wherein the first material is a magnetic material. In the embodiment of the present invention, the first material is silicon steel, that is, the rotor core 321 includes a plurality of silicon steel sheets stacked in the thickness direction by a prescribed number of sheets, so that the overall shape of the rotor core 321 is formed in a cylindrical shape. The rotor core 321 has a plurality of rotor slots penetrating in the axial direction. A plurality of rotor conductors are disposed within the rotor slots, wherein the rotor conductors may be made of an aluminum material.

In order to increase the weight of the rotor 32 without changing the size of the stator 33 and the rotor 32 of the motor assembly 3 in the existing compressor, the rotor 32 thus further includes a weighting plate 323. The weighting plate is made of a second material, wherein the density of the second material is greater than the density of the first material. The weighting plate 323 is stacked on and/or under the plurality of silicon steel plates (i.e., the rotor core 321). In the embodiment shown in fig. 1, two weight plates are disposed above the rotor core 321 and below the rotor core 321, respectively. The second material may preferably be any of copper, cadmium copper or permanganate copper. In an embodiment of the present invention, the second material is copper, i.e., the weighting plate 323 is a copper sheet. The density of the copper sheet is higher than that of the silicon steel sheet, so that the volume of the copper sheet can be reduced on the premise of increasing the same weight. Specifically, compared with the simple way of increasing the number of the silicon steel sheets to increase the weight, the weight of the copper sheets to be increased is far smaller than the thickness of the silicon steel sheets (for example, the copper sheets only need 3 mm and the silicon steel sheets only need 10 mm) on the premise of achieving the same weight, if the silicon steel sheets are used for weight increase, the increased thickness is higher, and then the electromagnetic force is required to move upwards (for example, the silicon steel sheets are increased by 10 mm, the electromagnetic force is required to move upwards by 5 mm), copper wires (additionally, higher cost is increased) used for adding the stator winding are required to be increased, and the force arm is longer, and the stress is worse. It can be seen that the density of the second material used in the present invention is greater than that of the first material used in the rotor core, so that the limited space inside the compressor housing 1 is effectively utilized, and the problems of increased moment arm, severe stress, etc. can be avoided. Optionally, the weighting plate 323 is riveted with the silicon steel plate of the rotor core 321.

More specifically, the shape and size of the copper sheet as the weighting sheet 323 in a section perpendicular to the axial direction are the same as those of the silicon steel sheet of the rotor core 321. In the embodiment of the invention, the section of the copper sheet perpendicular to the axial direction is circular, so that centrifugal force is avoided. The total weight of the weight-increasing sheet (i.e., including the weight-increasing sheet 323 disposed above the rotor core 321 and below the rotor core 321) is 0.09 kg and the total thickness is 3mm, wherein the weight of the weight-increasing sheet disposed above the rotor core 321 may be 0.051 kg and the weight of the weight-increasing sheet disposed below the rotor core 321 may be 0.039 kg. The total weight M of rotor 32, which may be 1.974 kg, includes the weight of rotor core 321, the weight of all rotor conductors, and the weight of weighting plate 323.

Further, in the embodiment of the present invention, the ratio between the inner diameter d1 of the rotor 32 and the outer diameter d2 of the rotor 32 is less than or equal to 0.344. The ratio between the outer diameter D2 of the rotor 32 and the inner diameter D of the housing 1 is 0.5 or more.

Further, the rotor further comprises an upper counterweight and a lower counterweight, wherein the total weight of the rotor comprises the weights of the upper counterweight and the lower counterweight. The upper balance weight is arranged above the weight increasing piece or the rotor core, and the lower balance weight is arranged below the weight increasing piece or the rotor core. Specifically, in the embodiment shown in fig. 1 in which the weight plate 323 is provided above the rotor core 321, the upper weight 35 is provided above the weight plate 323; however, in other embodiments, when the weight plate 323 is not provided above the rotor core 321, the upper weight 35 is provided above the rotor core 321. Similarly, in the embodiment shown in fig. 1 in which the weight plate 323 is provided below the rotor core 321, the lower weight 36 is provided below the weight plate 323; however, in other embodiments, when the weight plate 323 is not provided below the rotor core 321, the lower weight 36 is provided below the rotor core 321.

Further, in one embodiment of the present invention, the inner diameter of the rotor 32 of the compressor is 20 mm, the outer diameter of the rotor 32 is 62 mm, and the inner diameter of the casing 1 is 123 mm. The inner diameter and the outer diameter of the rotor 32 and the inner diameter of the shell of the compressor are both one type of the existing compressor, and the weight of the rotor is increased only by arranging the copper sheet serving as the weight increasing sheet in the embodiment of the invention, so that other component structures of the compressor are not required to be changed, the existing compressor can be slightly changed, and compared with a mode of improving electromagnetic compatibility of double rotors or changing motor windings and the like, the realization cost is lower.

Fig. 2 is a schematic view of a counterweight and weighting plate of a compressor according to another embodiment of the invention, referring to fig. 2. Unlike the embodiment shown in fig. 1 described above, the upper and/or lower weights in this embodiment are integrally formed with the weighting plate. Specifically, in fig. 2, a weight plate is provided above the rotor core as an example. As shown in fig. 2, the upper balance weight 35 is protruded on the upper surface of the weight plate 323, and the weight plate 35 and the upper balance weight 323 can be made of the same material (such as copper, etc.), and then the weight plate 35 and the upper balance weight 323 can be assembled on the rotor core 321 at the same time only through riveting between the weight plate 35 and the silicon steel sheet of the rotor core 321 after being integrally formed, so that the assembly between the weight plate 35 and the rotor core 321 is facilitated. It should be noted that, similarly to fig. 2, when a weight plate is disposed below the rotor core, the lower balance weight may be integrally formed with the weight plate, which is not described herein.

As is clear from the above, the embodiment of the invention increases the weight of the rotor of the motor assembly, so that the ratio between the weight of the rotor and the inner diameter of the shell is greater than or equal to 0.016 kg/mm, thereby increasing the moment of inertia in the rotating process of the rotor, further inhibiting the instability (second harmonic) in the running process of the compressor, improving the electromagnetic compatibility (EMC), and enabling the electromagnetic compatibility (EMC) to meet the detection requirement. In addition, in the embodiment of the invention, as the rotor weight is increased by arranging the copper sheets on the silicon steel sheets and/or below the silicon steel sheets, the method is realized in a limited space inside the compressor shell, and meanwhile, the influence on the stress of the crankshaft is avoided, so that the reliability of the compressor is effectively ensured.

Claims

1. A compressor, the compressor comprising:

A housing;

A motor assembly housed within the housing, the motor assembly comprising:

a rotor and a stator, the stator having a cylindrical region, the rotor disposed within the cylindrical region of the stator and rotatable relative to the stator, the rotor comprising:

a rotor core made of a first material and having a plurality of rotor slots penetrating in an axial direction;

a plurality of rotor conductors disposed within the rotor slots;

Weight plates are arranged on the rotor core and/or below the rotor core in a stacked manner, and are made of a second material, and the density of the second material is greater than that of the first material; the shape and the size of the weighting piece on a section perpendicular to the axial direction are the same as those of the rotor core;

The weight of the rotor at least comprises the sum of the weight of the rotor iron core, the weight of all the rotor conductors and the weight of the weighting piece, and the ratio between the weight of the rotor and the inner diameter of the shell is more than or equal to 0.016 kg/mm and less than 0.02 kg/mm;

The rotor further comprises an upper balance weight and a lower balance weight, wherein the upper balance weight is arranged above the weight increasing piece or the rotor core, and the lower balance weight is arranged below the weight increasing piece or the rotor core, and the weight of the rotor further comprises the weight of the upper balance weight and the weight of the lower balance weight;

And the upper balance weight and/or the lower balance weight and the weighting piece are integrally formed.

2. The compressor of claim 1, wherein the first material is silicon steel and the second material is any one of copper, cadmium copper, or permanganate copper.

3. The compressor of claim 2, wherein the rotor core includes a plurality of silicon steel sheets stacked in an axial direction, the weight increasing sheet is a copper sheet disposed above the plurality of silicon steel sheets and/or below the plurality of silicon steel sheets, wherein a shape and a size of a section of the copper sheet perpendicular to the axial direction are the same as the silicon steel sheets.

4. A compressor according to claim 3, wherein said copper sheet is riveted to a plurality of said silicon steel sheets.

5. The compressor of claim 1, wherein a ratio between an inner diameter of the rotor and an outer diameter of the rotor is less than or equal to 0.344.

6. The compressor of claim 1, wherein a ratio between an outer diameter of the rotor and an inner diameter of the housing is 0.5 or more.

7. The compressor of claim 1, wherein the weighting plates have a circular cross-section perpendicular to the axial direction, the weighting plates having a total weight of 0.09 kg and a total thickness of 3 mm, and the rotor having a total weight of 1.974 kg.