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Car air-conditioner evaporator refrigerating agent flow control system

A refrigerant flow rate and evaporator technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as excessive evaporator overheating, compressor liquid shock, affecting system stability and comfort, etc., to achieve Improve heat transfer efficiency, ensure stability, and avoid overheating

Inactive Publication Date: 2004-02-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of large changes in the compressor speed, if the refrigerant flow rate cannot be adjusted in time to ensure an appropriate superheat, phenomena such as compressor liquid shock or evaporator overheating may occur, seriously affecting the stability and stability of the system. comfort

Method used

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  • Car air-conditioner evaporator refrigerating agent flow control system
  • Car air-conditioner evaporator refrigerating agent flow control system

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specific Embodiment approach

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings

[0008] Such as figure 1 As shown, the present invention mainly includes: compressor 1, condenser 2, liquid receiver 3, electronic expansion valve 4, evaporator fan 5, evaporator 6, evaporator outlet temperature sensor 7, evaporator inlet temperature sensor 8, compression Engine speed sensor 9, AD conversion module 10, controller 11, electronic expansion valve drive circuit 12, feedforward compensation link 13. The outlet of compressor 1 is connected to the inlet of condenser 2, the outlet of condenser 2 is connected to the inlet of liquid accumulator 3, the outlet of liquid accumulator 3 is connected to the inlet of electronic expansion valve 4, the outlet of electronic expansion valve 4 is connected to the inlet of evaporation The inlet of the evaporator 6 is connected, and the outlet of ...

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Abstract

The car air-conditioner refrigerant flow control system adopts the electronic expansion valve as refrigerant flow regulating mechanism. The inlet and outlet of the evaporator are equipped with temp. sensors for respectively measuring the temp. of inlet and outlet of evaporator, and the sum of the difference of both two temp. and correction value of overheating degree of the pressure drop in the evaporator can be used as actual overheating degree of evaporator, and the deviation of the actual overheating degree and set overheating degree can be used as overheating degree feedback signal of theevaporator and fed into the controller, at the same time the rotating speed of the compressor as feedforward signal also can be fed into the controller.

Description

technical field [0001] The invention relates to a refrigerant flow control system for an evaporator of a car air conditioner, in particular to a system that uses an electronic expansion valve as a throttling mechanism and controls the electronic expansion valve through a feed-forward signal of the compressor speed and a feedback signal of the superheat degree of the evaporator. The control system for ensuring the proper flow rate of refrigerant supplied to the evaporator belongs to the technical field of automobile air conditioning. technical background [0002] The refrigerant flow control of the evaporator of the automobile air conditioner usually adopts a thermal expansion valve and a short throttle tube. After the liquid enters the liquid receiver, part of it is stored in the liquid receiver, and part of it enters the evaporator through the regulation of the thermal expansion valve, evaporates in the evaporator and becomes refrigerant gas, and enters the compressor to co...

Claims

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Application Information

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IPC IPC(8): B60H1/32F25B49/02
Inventor 陈芝久陈江平李绪泉
Owner SHANGHAI JIAO TONG UNIV
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