CN202391741U - Compressor with low backpressure structure - Google Patents

Abstract

A compressor with a low back pressure structure, including a shell, a motor and moving parts arranged in the shell, and a suction port and an exhaust pipe respectively communicated with the inner space of the shell, characterized in that the insulation class of the motor is A Grade or Y grade, the heat-resistant allowable temperature of the insulating material is 105°C or 90°C. Because the utility model adopts A-level or Y-level motor heat-resistant insulating materials, it can greatly reduce the cost of the compressor while ensuring the reliability of the motor operation.

Description

Compressor with low back pressure structure

technical field

The utility model relates to a compressor with a low back pressure structure.

Background technique

Insulation protection must be provided between the motor winding and the stator core. At present, there are two common types of insulation protection, one is insulating film, and the other is plastic insulation with certain mechanical strength.

In the traditional "high pressure in shell (HSS)" structure compressor, because the motor will generate a lot of heat during operation, the motor is working under high temperature conditions, although it is cooled by the compressed refrigerant, but due to the compressed The refrigerant itself is in a state of high temperature and high pressure, and the temperature of the motor after cooling is still very high, generally in the range of 60-120°C. Therefore, in the existing hermetic rotary compressors with "high pressure in the shell (HSS)" structure, the insulation and heat resistance grades of the motors are all E grades, and the heat resistance requirements of some motor insulation and heat resistance materials must also reach E grades (120°C) requirements.

The classification of motor insulation grades is based on the allowable limit temperature of the insulating material used in the motor. The so-called allowable limit temperature refers to the allowable maximum operating temperature of the motor insulating material, which reflects the heat resistance of the insulating material and is divided into Y, A, E , B, F, H, C and other grades, the allowable limit temperature of each grade is as follows.

However, the low-pressure structure compressor (LSS) in the shell is in a low-pressure environment of suction pressure in the compressor shell, so the gas specific volume is large, and the quality of the refrigerant contained in the internal space of the compressor is relatively high when the shell is in a high-pressure structure. significantly reduced. In the "low pressure inside the shell" structure compressor, the motor is cooled by suction. Under the condition of the refrigeration device running, the suction temperature is relatively low. Generally, the temperature of the motor is about 5-50 ℃ higher than the suction temperature. High pressure in body (HSS) The motor temperature of the traditional structure is lower.

The Class E insulation of motors used in existing hermetic rotary compressors has the disadvantage of high cost. Therefore, it is necessary to make further improvements.

Utility model content

The purpose of the utility model is to provide a compressor with a low back pressure structure which can ensure the reliable operation of the motor and greatly reduce the cost, so as to overcome the deficiencies in the prior art.

A compressor with a low back pressure structure designed according to this purpose, including a shell, a motor and moving parts arranged in the shell, and a suction port and an exhaust pipe respectively communicated with the inner space of the shell. It is characterized in that the motor The insulation grade of the insulation is Class A or Class Y, and the heat-resistant allowable temperature of the insulating material is 105°C or 90°C.

The suction port is arranged on the upper part of the casing and communicates with the internal space of the casing; the low-temperature gas sucked by the suction port passes through the motor and enters the moving parts to be compressed and then discharged through the exhaust pipe.

The exhaust pipe is arranged at the lower part of the casing and communicates with the cylinder exhaust hole and the exhaust passage.

Because the utility model adopts A-level or Y-level motor heat-resistant insulating materials, it can greatly reduce the cost of the compressor while ensuring the reliability of the motor operation.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Among the figure: 11 is a motor, 12 is an air inlet, 13 is a casing, 14 is a moving part, and 15 is an exhaust pipe.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Referring to Fig. 1, a compressor with a low back pressure structure includes a casing 13, a motor 11 and a moving part 14 arranged in the casing 13, and a suction port 12 and an exhaust port respectively communicated with the inner space of the casing 13. The insulation grade of the tube 15 and the motor 11 is Class A or Class Y, and the heat-resistant allowable temperature of the insulating material is 105°C or 90°C.

In the low-pressure structure rotary compressor in the shell, the motor 11 is located in the low-temperature and low-pressure environment in the shell 13, and the suction port 12 of the compressor is arranged on the upper part of the shell 13 of the compressor and communicates with the inner space of the shell 13 , the low-temperature inhaled gas enters the inner space of the housing 13 through the suction port 12, and after being cooled by the motor 11, is sucked into the moving part 14 to complete the compression process, and then passes through the lower part of the housing 13 and the cylinder exhaust hole and The exhaust pipe 15 through which the exhaust passage communicates enters into the refrigeration system. In this way, the temperature of the motor 11 after suction cooling is about 5-50°C higher than the suction temperature, which meets the requirements of class A and/or class Y insulation and heat resistance, so that in this hermetic rotary compressor, the insulation of the motor 11 Grades can be A-level and/or Y-level.

The low-pressure structure compressor motor in the utility model heats up through suction cooling, because the suction temperature is low, the temperature of the motor after cooling is generally about 5-50°C higher than the suction temperature, so, under the operating conditions of the refrigeration device , the temperature of the motors 11 is lower than 90°C. In this way, the motors 11 with E-class insulation requirements used in the existing hermetic rotary compressors can be changed to A-class or Y-class insulation requirements. While improving the reliability of the operation, the cost of the compressor can be greatly reduced.

In the above-mentioned embodiment, only typical implementations are listed, and other easy-to-expand implementations, such as the position of the suction port 12 in the embodiment, can be set on the upper, middle or lower part of the housing 13, and the exhaust pipe 15 can be directly It is connected to the exhaust hole of the cylinder, or connected to the exhaust chamber between the exhaust pipe 15 and the exhaust hole of the cylinder. Embodiments of the cooling effect will not be repeated here.

Claims (3)

1. the compressor of a low back-pressure structure; Comprise housing (13), be arranged on motor (11) and moving element (14) in the housing (13); And the intakeport (12) and the outlet pipe (15) that are communicated with housing (13) inner space respectively; The insulation class that it is characterized in that motor (11) is A level or Y level, and the heat-resisting allowable temperature of insulating material is 105 ℃ or 90 ℃.

2. according to the compressor of the said low back-pressure structure of claim 1, it is characterized in that said intakeport (12) is arranged on housing (13) top and is communicated with housing (13) inner space; The cryogenic gas that intakeport (12) sucks enters into moving element (14) compression back through motor (11) and discharges through outlet pipe (15).

3. according to the compressor of claim 1 or 2 said low back-pressure structure, it is characterized in that said outlet pipe (15) is arranged on housing (13) bottom and is communicated with cylinder block pore and exhaust passageway.