Expansion shaft device used for installing refrigeration compressor motor

Abstract

The invention discloses an expansion shaft device used for installing a refrigeration compressor motor, and is used for the field of the refrigeration compressor. The expansion shaft device used for installing the refrigeration compressor motor comprises a circular-tube shaped expansion shaft, an inner expansion sleeve and an outer expansion sleeve, wherein the inner expansion sleeve and the outer expansion sleeve are coaxially arranged in and outside the expansion shaft; the inner surface of the expansion shaft is an inner conical surface which is gradually reduced from top to bottom along the axial direction; the outer surface of the expansion shaft is an outer conical surface which is gradually expanded from top to bottom along the axial direction; the side walls of the inner expansion sleeve and the outer expansion sleeve are both provided with through holes evenly distributed along the circumference; an inner sliding block of which the outer end is fitted with the inner conical surface is respectively arranged in each through hole in the inner expansion sleeve; an outer sliding block of which the inner end is fitted with the outer conical surface is respectively arranged in each through hole in the outer expansion sleeve. According to the expansion shaft device used for installing the refrigeration compressor motor, which is disclosed by the invention, all components are tightly matched; the assembling offline problem due to an uneven stator and rotor installation gap can be effectively solved while the coaxial installation precision of the motor stator and the motor rotor is guaranteed, the assembling beat of the compressor is guaranteed, the production efficiency is improved, and meanwhile, a feasible scheme is provided for further reducing a gap between the stator and the rotor to improve the motor efficiency.

Description

technical field [0001] The invention is used in the field of refrigeration compressors, and in particular relates to an expansion shaft device used for installing a motor of a refrigeration compressor. Background technique [0002] Refrigeration compressors mostly use reciprocating compressors. Reciprocating compressors are volumetric compressors, which are compressors that sequentially suck and discharge a certain volume of gas into and out of a closed space. There is a motor in the compressor, the stator of the motor is fixedly connected with the body of the compressor, and the rotor is connected with the crankshaft. The rotor rotates in the stator and drives the crankshaft connecting rod mechanism to push the piston to reciprocate, completing the four stages of suction, compression, exhaust and expansion. process. [0003] Reducing the air gap between the stator and the rotor is an important means to improve the efficiency of the motor. The efficiency of the motor is imp...

AI Technical Summary

Problems solved by technology

Under the existing refrigeration compressor assembly process, the low installation accuracy of the stator and rotor is an important reason that seriously affects the compressor assembly cycle and reduces production efficiency. Therefore, it is impossible to improve the efficiency of the compressor by reducing the air gap between the stator and rotor

[0004] With the development of society, refrigerator manufacturers have higher and higher requirements on the performance of compressors, and reducing the clearance between the stator and rotor of the compressor motor is an important means to improve the performance of the compressor (at present, the clearance between the stator and rotor of the motor in the industry is generally 0.25 mm or more), but the reduction of the gap between the stator and rotor of the motor increases the requirements for the installation accuracy of the stator and rotor of the motor, otherwise it will lead to the problem of low production efficiency caused by the uneven gap of the motor.

[0005] In the prior art, most of the motors on the assembly line of the compressor adopt the assembly process of assembling the rotor first and then the stator. There are two main methods for this process: 1. After the rotor is assembled on the crankshaft, the gaps are used to evenly distribute After assembling the stator around the rotor, fasten the screws, pull out the spacer, and complete the installation, but this method is not suitable for mechanized production, and the production efficiency is low; , the equipment accurately locates the positioning point of the cylinder block and the positioning point of the stator and then assembles the stator. This installation method requires the cylinder block, rotor, and stator to have high processing accuracy and high-precision stator assembly equipment. The cost of equipment investment and parts processing is high, and the parts scrap rate high

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