CN113783321A

CN113783321A - Compressor and air conditioner

Info

Publication number: CN113783321A
Application number: CN202111164165.9A
Authority: CN
Inventors: 赵旭敏; 张科; 叶晓飞
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai; Zhuhai Landa Compressor Co Ltd
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai; Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd; Zhuhai Landa Compressor Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-12-10

Abstract

The invention provides a compressor and an air conditioner, wherein the compressor comprises a compressor shell and a motor stator positioned in the compressor shell, the motor stator comprises a stator core, the outer circumferential wall of the stator core is connected with the compressor shell in a laser welding mode, and a welding seam ring extending along the circumferential direction of the compressor shell is formed between the stator core and the compressor shell in the laser welding mode. According to the invention, the stator core and the compressor shell are reliably connected through laser welding, so that the connection strength of the stator core and the compressor shell can be enhanced, the extrusion deformation of the stator core caused by interference connection in the prior art is effectively avoided, the coaxiality of the stator and the rotor is ensured, the efficiency of corresponding motor parts is improved, the fundamental frequency vibration amplitude of the stator transmitted to the shell when the compressor operates is reduced, and the radiation noise of the compressor is reduced.

Description

Compressor and air conditioner

Technical Field

The invention belongs to the technical field of compressor manufacturing, and particularly relates to a compressor and an air conditioner.

Background

The rolling rotor compressor drives the pump body structure to rotate through the motor assembly, compresses a refrigerant from a low-temperature low-pressure state to a high-temperature high-pressure state and inputs the refrigerant into the air conditioning system to achieve the refrigerating and heating effects. The motor assembly is used as a power system of the compressor and the air conditioner, and the noise vibration level of the motor assembly directly determines the noise level of the air conditioner system; the stator is also an important component of the motor assembly, and the installation mode and the vibration reduction design of the stator are important to the noise of the motor. The stator of the existing rolling rotor compressor is mainly assembled in a compressor shell in an interference fit mode in a shrink fit mode, namely the outer diameter of the stator is larger than the inner diameter of the shell, the shell and a stator matching area are expanded through electric heating, then the stator is installed in the shell, and the shell and the stator are assembled after the shell is cooled. The existing assembly mode has more defects: firstly, in order to ensure that the interference magnitude of the stator and the shell is usually larger than 0.1 mm, the internal stress generated after the shell is cooled and shrunk is larger, so that the internal diameter of the stator is deformed greatly, the coaxiality of a stator and a rotor is poorer, and the motor efficiency is influenced, the phenomenon is more obvious on small series low-stack-height compressors; secondly, the connection strength of the existing stator interference fit mode is relatively low, the vibration deformation of the stator is large, and the vibration transmitted to the shell by the stator is large, so that the vibration of a compressor and an air conditioning system is large, and the noise level is poor; thirdly, the fluctuation range of the stator holding force of the existing interference fit mode is relatively large in 9-20 KN, so that the coaxiality fluctuation of the compressor is large, and the consistency of electromagnetic noise is poor; and fourthly, the existing stator has no assembly internal stress and vibration buffering design, the stator vibration is directly transmitted to the shell, and the compressor vibration is relatively large.

Therefore, under the condition of ensuring the pretightening force of the stator, the mounting mode and the shape of the iron core of the motor stator are reasonably designed, and the method is of great importance for reducing the noise of the compressor and improving the consistency of the electromagnetic noise of the compressor.

Disclosure of Invention

Therefore, the invention provides a compressor and an air conditioner, which can overcome the defects of deformation of internal teeth of a motor stator core, poor coaxiality of a stator and a rotor, low efficiency of motor parts and large vibration of the compressor caused by the interference fit connection between the motor stator and the compressor shell in the compressor in the related technology.

In order to solve the above problems, the present invention provides a compressor, including a compressor housing and a motor stator located in the compressor housing, wherein the motor stator includes a stator core, an outer circumferential wall of the stator core is connected to the compressor housing by a laser welding method, and a weld ring extending along a circumferential direction of the compressor housing is formed between the stator core and the compressor housing by the laser welding method.

In some embodiments, the stator core is configured with a plurality of flow holes extending axially therethrough and extending axially therethrough at both ends.

In some embodiments, the flow holes are uniformly spaced along a circumferential direction of the stator core.

In some embodiments, on the radial plane of the stator core, the flow holes have an inner arc wall at the radial inner side of the stator core and an outer arc wall at the radial outer side of the stator core, the outer arc wall is concentric with the outer circumferential wall of the stator core, and the radial distance between the outer arc wall and the outer circumferential wall of the stator core is D1, D1 is more than or equal to 2 mm; and/or the total circulating area of the plurality of circulating holes is Sa, the end surface area of the axial first end surface of the stator core is Sb, and Sa/(Sb-Sa) > 7%.

In some embodiments, the inner arc wall is concentric with the outer arc wall at a radial separation of C1, and the outer arc wall has a chord length of A1, A1/C1 > 5.

In some embodiments, the circumferential spacing between two adjacent flow holes is B1, B1/a1 > 1/5.

In some embodiments, the stack height of the stator core is L0, the stator inner diameter of the stator core is R1, the stator outer diameter is R2, and the weld ring has one strip when L0 is more than or equal to 20mm and less than or equal to 40mm, R1 is more than or equal to 32mm, and R2 is more than or equal to 44mm and less than or equal to 56 mm; or when the L0 is more than or equal to 30mm and less than or equal to 35mm, the R1 is more than 32mm and the R2 is more than 56mm, one welding ring is arranged.

In some embodiments, the stack height of the stator core is L0, the stator inner diameter of the stator core is R1, the stator outer diameter is R2, L0 is more than 40mm, 20mm R1 is less than or equal to 32mm, and 44mm R2 is less than or equal to 56mm, at least two weld rings are provided; alternatively, L0 > 35mm, R1 > 32mm and R2 > 56mm, the weld ring having at least two.

In some embodiments, the weld ring has one strip, the minimum axial distance between the weld ring and the first axial end face of the stator core is L1, the minimum axial distance between the weld ring and the second axial end face of the stator core is L2, L1 is greater than or equal to 10mm, and L2 is greater than or equal to 10 mm.

In some embodiments, when there are a plurality of weld rings, the plurality of weld rings are arranged at intervals along the axial direction of the stator core, the minimum axial distance between the weld ring closest to the axial first end surface of the stator core and the axial first end surface of the stator core is L1, the minimum axial distance between the weld ring closest to the axial second end surface of the stator core and the axial second end surface of the stator core is L2, L1 is greater than or equal to 10mm, and L2 is greater than or equal to 10 mm; and/or the minimum distance between two adjacent welding seam rings is L3, and L3 is more than or equal to 5 mm.

The invention also provides an air conditioner which comprises the compressor.

According to the compressor and the air conditioner, the stator core and the compressor shell are reliably connected through laser welding, so that the connection strength of the stator core and the compressor shell can be enhanced, the extrusion deformation of the stator core caused by interference connection in the prior art is effectively avoided, the coaxiality of the stator and the rotor is ensured, the efficiency of corresponding motor parts is improved, the fundamental frequency vibration amplitude of the shell transmitted by the stator during the operation of the compressor is reduced, and the radiation noise of the compressor is reduced.

Drawings

Fig. 1 is a schematic view of an internal structure of a compressor according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of the stator core shown in fig. 1;

FIG. 3 is an enlarged partial schematic view of FIG. 2;

FIG. 4 is a schematic view of a compressor in which a motor stator is connected to a compressor casing by a weld ring according to an embodiment of the present invention;

FIG. 5 is a schematic view of a compressor in which a motor stator is connected to a compressor casing by three weld rings according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the vibration amplitude of the shell of a compressor using the solution of the present invention and a compressor not using the solution of the present invention;

fig. 7 is a schematic diagram of internal tooth assembly stress of a stator core of a compressor adopting the technical scheme of the invention and a stator core of a compressor not adopting the technical scheme of the invention.

The reference numerals are represented as:

1. a compressor housing; 2. a motor stator; 21. a stator core; 22. a flow-through hole; 221. an inner arc wall; 222. an outer arc wall; 23. a winding and a stator frame; 3. welding a seam ring; 4. a motor rotor; 5. and a pump body assembly.

Detailed Description

Referring to fig. 1 to 7 in combination, according to an embodiment of the present invention, a compressor is provided, which includes a compressor housing 1, and a motor stator 2, a motor rotor 4, and a pump assembly 5 in the compressor housing 1, where the pump assembly 5 is driven to operate under the combined action of the motor stator 2 and the motor rotor 4 to suck, compress, and discharge a refrigerant, the top and the bottom of the compressor housing 1 are respectively connected with an upper cover assembly and a lower cover, the motor stator 2 includes a stator core 21, an outer circumferential wall of the stator core 21 is connected with the compressor housing 1 by a laser welding method, and a weld ring 3 extending along a circumferential direction of the compressor housing 1 is formed between the stator core 21 and the compressor housing 1 by the laser welding method. In this technical scheme, stator core 21 with form reliable connection through laser welding between the compressor housing 1, can strengthen stator core 21 with compressor housing 1's joint strength to effectively avoid the interference among the prior art to connect the extrusion deformation to stator core 1, guarantee the axiality of stator and rotor, improve the motor element efficiency that corresponds, the base frequency vibration amplitude that the stator transmitted to the casing when reducing the compressor operation reduces compressor radiation noise. It should be noted that the weld joint of the laser welding needs to form the weld joint ring 3 around the stator, the principle of the laser welding is that the casing and the stator core are locally fused together in a laser heating mode to realize stator fixing without designing a welding hole and filling welding flux, the welding process can be simplified, and the welding cost is reduced.

In some embodiments, the stator core 21 is configured with a plurality of flow holes 22 extending along the axial direction thereof and penetrating through both ends of the axial direction thereof, the design of the flow holes 22 can ensure smooth exhaust of the upper and lower cavities inside the compressor, thereby preventing the adverse occurrence of reduced compressor cooling capacity, increased power and low energy efficiency caused by unsmooth exhaust, and can also facilitate the formation of a thin-wall structure at the outer circumferential wall of the stator core 21, so that the deformability of the outer circumferential wall of the stator core 21 can be increased, the pre-assembly positioning between the stator core 21 and the compressor housing 1 before welding can be facilitated, and the internal stress to the position of the internal teeth of the stator core 21 during welding can be reduced, the deformation of the internal teeth can be reduced, the coaxiality of the compressor can be improved, and the electromagnetic noise of the compressor can be reduced; on the other hand, a vibrating air barrier structure can be formed, and the radiation conduction of electromagnetic noise inside the compressor to the outside of the compressor through the stator core 21 can be reduced.

In some embodiments, the circulation holes 22 are uniformly spaced along the circumferential direction of the stator core 21, so that the compressor casing 1 can have balanced stress in the circumferential direction, and the coaxiality of the stator and the rotor after assembly can be ensured.

On the radial plane of the stator core 21, the circulation hole 22 has an inner arc wall 221 located on the radial inner side of the stator core 21 and an outer arc wall 222 located on the radial outer side of the stator core 21, the outer arc wall 222 is concentric with the outer circumferential wall of the stator core 21, the radial distance between the outer arc wall and the outer circumferential wall is D1, and D1 is greater than or equal to 2mm, so that the outer circumferential wall of the stator core 21 and the circulation hole 22 can be effectively prevented from being welded through in the laser welding process, the connection part is reliable, and the circulation area is also prevented from being occupied; in order to ensure the smooth circulation of the circulation holes 22, the total circulation area of the circulation holes 22 is Sa, and the end surface area of the axial first end surface of the stator core 21 is Sb, Sa/(Sb-Sa) > 7%.

The inner arc wall 221 and the outer arc wall 222 are concentric, the radial distance between the two is C1, the chord length of the outer arc wall 222 is A1, A1/C1 is more than 5, a compressor refrigerant is discharged from the lower cavity of the motor to the upper cavity, and the stator core 21 is ensured to have a sufficient flow area (a sufficient circumferential length) through the size limitation, so that the refrigerant is prevented from being accumulated in the lower cavity of the motor, the power of the compressor is increased, and the energy efficiency is reduced.

In some embodiments, the circumferential distance between two adjacent flow holes 22 is B1, B1/A1 is more than 1/5, and the connection strength of the inner side of the stator is ensured.

In some embodiments, the stack height of the stator core 21 is L0, the stator inner diameter of the stator core 21 is R1, the stator outer diameter is R2, and the weld ring 3 has one piece when 20mm L0 is 40mm, 20mm R1 is 32mm, and 44mm R2 is 56 mm; or when L0 is more than or equal to 30mm and less than or equal to 35mm, R1 is more than 32mm and R2 is more than 56mm, one welding seam ring 3 is arranged, namely when the weight of the stator core 21 is relatively small, one welding seam ring 3 is arranged, and reliable connection can be achieved.

In some embodiments, the stack height of the stator core 21 is L0, the stator inner diameter of the stator core 21 is R1, the stator outer diameter is R2, L0 is more than 40mm, 20mm R1 is less than 32mm, and 44mm R2 is less than 56mm, the number of the welding seam rings 3 is at least two; or L0 is more than 35mm, R1 is more than 32mm and R2 is more than 56mm, the number of the welding seam rings 3 is at least two, namely, when the weight of the stator core 21 is relatively larger, a plurality of the welding seam rings 3 are arranged to ensure reliable connection.

In some embodiments, the weld ring 3 has one weld ring, the minimum axial distance between the weld ring 3 and the first axial end face of the stator core 21 is L1, the minimum axial distance between the weld ring 3 and the second axial end face of the stator core 21 is L2, L1 is greater than or equal to 10mm, and L2 is greater than or equal to 10 mm; or, when the number of the weld rings 3 is multiple, the multiple weld rings 3 are arranged at intervals along the axial direction of the stator core 21, the minimum axial distance between the weld ring 3 closest to the axial first end surface of the stator core 21 and the axial first end surface of the stator core 21 is L1, the minimum axial distance between the weld ring 3 closest to the axial second end surface of the stator core 21 and the axial second end surface of the stator core 21 is L2, L1 is greater than or equal to 10mm, and L2 is greater than or equal to 10mm, so that the weld rings 3 are not too close to the corresponding axial end surfaces of the stator core 21, and the windings and the stator frame 23 of the motor are prevented from being damaged.

When a plurality of welding seam rings 3 are arranged, the minimum distance between two adjacent welding seam rings 3 is L3, and L3 is more than or equal to 5mm, so that the connection reliability is ensured.

As can be seen from fig. 6, in the compressor adopting the technical solution of the present invention (i.e. circumferential welding), the shell vibration amplitude of the compressor shell 1 is significantly reduced compared to the compressor not adopting the technical solution of the present invention (i.e. conventional solution); as can be seen from fig. 7, the internal tooth fitting internal stress of the stator core 21 is also significantly reduced.

In the aspect of specific equipment, motor stator 2 and compressor housing 1 at first carry out the positioning through the mode of little interference heat jacket, then adopt laser welding to fix, little interference heat jacket and laser welding can produce the assembly internal stress at the stator excircle (also be the outer circumferential wall of stator core 21), the assembly internal stress passes through earlier runner hole 22 with thin wall structure between the outer circumferential wall can warp in advance because thin wall structure rigidity is less to reduce the assembly internal stress size of conduction to the stator internal tooth, reduce the stator internal tooth and warp, improve the compressor axiality, reduce compressor electromagnetic noise. The motor stator 2 is welded with the compressor shell 1 in a laser mode, the connecting strength of the stator and the shell can be enhanced, the base frequency vibration amplitude of the stator transmitted to the shell when the compressor operates is reduced, and the radiation noise of the compressor is reduced.

According to an embodiment of the invention, an air conditioner is also provided, which comprises the compressor.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The compressor comprises a compressor shell (1) and a motor stator (2) in the compressor shell (1), wherein the motor stator (2) comprises a stator core (21), and is characterized in that the outer circumferential wall of the stator core (21) is connected with the compressor shell (1) in a laser welding mode, and a welding seam ring (3) extending along the circumferential direction of the compressor shell (1) is formed between the stator core (21) and the compressor shell (1) in the laser welding mode.

2. The compressor of claim 1, wherein the stator core (21) is formed with a plurality of flow holes (22) extending in an axial direction thereof and penetrating both axial ends thereof.

3. The compressor according to claim 2, wherein the flow holes (22) are provided at regular intervals in a circumferential direction of the stator core (21).

4. The compressor according to claim 2 or 3, wherein the flow holes (22) have an inner arc wall (221) at a radially inner side of the stator core (21) and an outer arc wall (222) at a radially outer side of the stator core (21) on a radial plane of the stator core (21), the outer arc wall (222) being concentric with an outer circumferential wall of the stator core (21) with a radial distance of D1, D1 ≧ 2 mm; and/or the total circulating area of the plurality of circulating holes (22) is Sa, the end surface area of the axial first end surface of the stator core (21) is Sb, and Sa/(Sb-Sa) > 7%.

5. The compressor of claim 4, wherein the inner arc wall (221) is concentric with the outer arc wall (222) and has a radial separation of C1, and the outer arc wall (222) has a chord length of A1, A1/C1 > 5.

6. A compressor according to claim 5, characterized in that the circumferential spacing between two adjacent flow holes (22) is B1, B1/A1 > 1/5.

7. The compressor of claim 1, wherein the stack height of the stator core (21) is L0, the stator inner diameter of the stator core (21) is R1, the stator outer diameter is R2, and the weld ring (3) has one when 20mm ≦ L0 ≦ 40mm, 20mm ≦ R1 ≦ 32mm, and 44mm ≦ R2 ≦ 56 mm; or when 30mm ≦ L0 ≦ 35mm, R1 > 32mm and R2 > 56mm, the weld ring (3) has one piece.

8. The compressor of claim 1, wherein the stack height of the stator core (21) is L0, the stator core (21) has at least two weld rings (3) when the stator inner diameter is R1, the stator outer diameter is R2, L0 > 40mm, 20mm ≦ R1 ≦ 32mm, and 44mm ≦ R2 ≦ 56 mm; alternatively, L0 > 35mm, R1 > 32mm and R2 > 56mm, the weld ring (3) having at least two.

9. The compressor as claimed in claim 1, wherein the weld ring (3) has one piece, the minimum axial distance between the weld ring (3) and the first axial end face of the stator core (21) is L1, the minimum axial distance between the weld ring (3) and the second axial end face of the stator core (21) is L2, L1 is 10mm or more, and L2 is 10mm or more.

10. The compressor according to claim 1, wherein when the plurality of the weld rings (3) are provided, the plurality of the weld rings (3) are arranged at intervals in the axial direction of the stator core (21), the minimum axial distance between the weld ring (3) closest to the axial first end surface of the stator core (21) and the axial first end surface of the stator core (21) is L1, the minimum axial distance between the weld ring (3) closest to the axial second end surface of the stator core (21) and the axial second end surface of the stator core (21) is L2, L1 is not less than 10mm, and L2 is not less than 10 mm; and/or the minimum distance between two adjacent welding seam rings (3) is L3, and L3 is more than or equal to 5 mm.

11. An air conditioner characterized by comprising the compressor of any one of claims 1 to 10.