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A low-voltage protection method for rail vehicle air conditioners

A low-voltage protection, rail vehicle technology, applied in railway vehicle heating/cooling, railway car body parts, transportation and packaging, etc. Effect

Active Publication Date: 2021-02-23
石家庄国祥运输设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned low-voltage protection method can only try to avoid the system being locked by low-voltage protection, but its protection is based on the fact that the low-voltage switch has already activated, and there is no predictive automatic control of the operation of the refrigeration system to adjust in advance to avoid low-pressure Switch action, at this time, the refrigeration system may have frost and spray water, or the system cannot be prevented from being locked by low pressure protection in the end.

Method used

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  • A low-voltage protection method for rail vehicle air conditioners
  • A low-voltage protection method for rail vehicle air conditioners
  • A low-voltage protection method for rail vehicle air conditioners

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Embodiment Construction

[0022] See attached figure 1 , the present invention provides an air-conditioning unit, which includes a blower, a compressor 3, a condenser 5, a condensing fan 6, an evaporator 9, an evaporating fan 10 and supporting pipelines, wherein the pipe at the suction end of the compressor 3 A low-pressure pressure protection switch 1 and a low-pressure pressure drop switch 2 are set on the road, a high-pressure pressure switch 4 is set on the pipeline at the exhaust end of the compressor 3, and a dry filter is set on the pipeline connecting the condenser 5 and the evaporator 9 7. A thermal expansion valve 8 is provided on the pipeline connecting the dry filter 7 and the evaporator 9, a liquid separator 12 is provided on the pipeline connecting the thermal expansion valve 8 and the evaporator 9, and a liquid separator 12 is provided on the pipeline connecting the compressor 3. A bypass solenoid valve 11 is provided on the pipeline between the end and the input end of the evaporator 9 ...

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Abstract

The invention discloses a low-voltage protection method for rail vehicle air conditioners, which belongs to the technical field of rail vehicle air-conditioning equipment, and is based on an air-conditioning unit with a low-pressure pressure drop switch and a bypass solenoid valve. The low-pressure pressure drop switch is arranged in the air-conditioner The suction end of the air conditioner, the two ends of the bypass solenoid valve communicate with the exhaust end of the compressor and the input end of the evaporator in the air conditioning unit respectively by means of pipelines. load exit step. The invention combines software and hardware, and advances the low-voltage protection measures of the air-conditioning system before a low-voltage fault occurs through the automatic control of unloading start-up and automatic control of pressure drop, which can significantly reduce the failure rate of the low-voltage protection of the system.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle air conditioners, and in particular relates to a low voltage protection method for rail vehicle air conditioners. Background technique [0002] Most of the air conditioners currently used in rail vehicles are mainly fixed-frequency air conditioners, and their low-voltage protection methods are mainly hardware and low-voltage switches. The number of times of protection of low-voltage switches is recorded, fault lockout, and fault reset through software. Low pressure protection for refrigeration systems. [0003] Refrigeration in the spring and autumn transitional seasons when the external temperature is low, the set temperature inside the car is low during cooling and / or the air supply volume is too small due to dirty air conditioner filters, etc., which will make the evaporation temperature of the air conditioner unit lower than the freezing point of water, and the evaporation Frosting occur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B61D27/00
CPCB61D27/0018
Inventor 王锦林耿超翟光波尹彩红
Owner 石家庄国祥运输设备有限公司
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