Method for detecting functions of thermostat of air-conditioning heating system
A heating system and function detection technology, which is applied in railway vehicle testing and other directions, can solve the problems of inaccurate test results, affecting the test cycle, and the air volume cannot be detected by the air pressure switch, so as to achieve high accuracy of measurement data and a small number of personnel required , The effect of reducing the test cost
Inactive Publication Date: 2012-11-07
CRRC CHANGCHUN RAILWAY VEHICLES CO LTD
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AI Technical Summary
Problems solved by technology
First of all, this test method cannot complete the detection of the function of the thermostat. After the forced evaporator air supply motor stops running, the air pressure switch cannot detect the air volume, and the heater cannot work.
Secondly, forcing the heater to work will increase the temperature in the entire air-conditioning unit, which may easily cause the burning of other equipment such as wires. Space, use the method of forcing the heater to work to make the temperature reach the set point, the time is slow, which affects the test cycle; fourth, the air conditioning unit is located on the roof, and when the heater is working, the operator cannot monitor the temperature in real time, and the test results Inaccurate, and low safety factor, easy to cause scald accidents
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0013] 1. Use a digital multimeter to measure the thermal contact of the thermostat before the test, and the contact is normally closed;
[0014] 2. Use a heat shrink gun to heat the thermostat to increase the temperature rapidly. At the same time, use an infrared temperature tester to monitor the temperature on the surface of the thermostat, and use a digital multimeter to monitor the disconnection of the thermostat’s thermal contacts. When the temperature reaches the set value, the digital multimeter measurement shows that the contact should be disconnected;
[0015] 3. Accelerate the temperature drop around the thermostat so that it reaches the temperature of the access point of the thermostat's hot contact. At this time, use a digital multimeter to measure that the thermostat's hot contact should return to the initial closed state.
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A method for detecting a thermostat of an air-conditioning heating system is characterized in that a thermal contact of the thermostat is measured by a digital multimeter before the thermostat is tested, and the contact is normally closed; a heat sink gun is aligned with the thermostat to heat up the thermostat, so that the temperature of the thermostat is increased quickly, simultaneously, the temperature of the surface of the thermostat is monitored by an infrared temperature tester, a disconnection condition of the thermal contact of the thermostat is monitored by the digital multimeter, and the digital multimeter displays that the contact needs to be disconnected when the temperature reaches a set value; and the surrounding temperature of the thermostat is reduced quickly so as to reach the access temperature of the thermal contact of the thermostat, and at the moment, the digital multimeter measures the thermal contact of the thermostat and displays that the thermal contact needs to recover the initial closed state. The testing operation method is simple, required tools are few, testing expenses can be greatly reduced, a safety factor is large, testing elapsed time is short, the quantity of required personnel is low, debugging period can be greatly shortened, real-time measurement can be realized, and accuracy of measurement data is high.
Description
technical field [0001] The invention relates to a method for detecting the function of a thermostat of an air-conditioning heating system. Background technique [0002] At present, the method for detecting the thermostat function of the air-conditioning heating system of the EMU is mainly to forcibly stop the operation of the evaporative fan, and at the same time make the heater of the air-conditioning system work, force the temperature to rise, and use a thermometer to detect when the temperature reaches the set point of the thermostat. Does the thermostat thermal contact disconnect the heater. First of all, this test method cannot complete the detection of the function of the thermostat. After the forced evaporator air supply motor stops running, the air pressure switch cannot detect the air volume, and the heater cannot work. Secondly, forcing the heater to work will increase the temperature in the entire air-conditioning unit, which may easily cause the burning of othe...
Claims
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Inventor 许艳飞
Owner CRRC CHANGCHUN RAILWAY VEHICLES CO LTD