A method for testing the sealing performance of air-conditioning units
An air conditioning unit and testing method technology, which is applied in the liquid/vacuum degree measurement of liquid tightness, by detecting the appearance of fluid at the leak point, etc., can solve the problem of difficult leak detection, troublesome rectification, and difficult to find the leak point. and other problems, to achieve the effect of easy to find, simple and feasible operation
Active Publication Date: 2020-09-11
CRRC QINGDAO SIFANG CO LTD
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Problems solved by technology
[0003] When the vehicle is running, it will encounter rainy days, especially for rail vehicles, and the operating environment is more complicated. When the air-conditioning unit has problems such as poor sealing of the bottom of the outdoor chamber, the air-conditioning unit is prone to water leakage during train operation in rainy days, and Leakage points are not easy to find, and rectification is more troublesome
At present, the air-tightness test of the air-conditioning unit is mainly carried out through the air-tightness test in the indoor cavity and the rain test of the air-conditioning unit. For air-conditioning units that are not tightly sealed, especially for trains that require air-tightness, it is even more difficult to detect leaks.
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[0023] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0024] Such as figure 1 with figure 2 As shown, a method for testing the sealing performance of an air-conditioning unit provided by the present invention includes a test bench 1, which is a box with an open top, and the casing of the air-conditioning unit 2 is sealed and installed above the test bench 1. The installation method of the housing on the test bench 1 is the same as the installation method on the roof of the vehicle, and the bottom part is sunk into the test bench 1 for installation. The test bench 1 is equipped with an air source interface 5, which is connected to the air source through the intake pipe. A pressure gauge 6 for detecting pressure is installed on the test bench 1. The pressure gauge 6 can be connected to the console, and the pressure gauge 6 displays the pressure value. At the same time, the pressure detection signa...
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The present invention relates to an air conditioning unit sealing performance test method. The method comprises the following steps of: after the housing of an air conditioning unit is completely manufactured, performing primary sealing test of the housing; after all the parts of the air conditioning unit are completely assembled, performing second sealing test of the housing, wherein the primarysealing test and the second sealing test both comprise water injection steps and pneumatic compression steps; and determining whether the sealing of the housing meets a design demand or not accordingto the decreasing speed of the air pressure after compression, and determining the position of a leakage point according to positions of bubbles after water injection. The air conditioning unit sealing performance test method can effectively solve the problem that the sealing of the housing of a roof embedded air conditioning unit is separately tested, and is simple and feasible to operate and easy to search leakage points of seams of the housing.
Description
technical field [0001] The invention relates to a sealing test method, in particular to a sealing test method for an air-conditioning unit installed on the roof of a rail vehicle. Background technique [0002] Most of the existing rail vehicles and passenger cars install the air conditioning unit on the roof. The air conditioning unit includes a shell, and the space in the shell is divided into an outdoor cavity and an indoor cavity. A compressor, a condenser, and a condensing fan are installed in the outdoor cavity. Etc., evaporator, evaporating fan, electric heater, etc. are installed in the indoor cavity, the air inlet and outlet of the condensing fan are arranged on the shell of the outdoor cavity, and the air supply to the room is provided on the shell of the indoor cavity. The air supply outlet, the return air outlet and the fresh air outlet for introducing fresh air. [0003] When the train is running, it will encounter rainy days, especially for rail vehicles, and t...
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IPC IPC(8): G01M3/02G01M3/06
CPCG01M3/02G01M3/06
Inventor 刘洁于晓良李秀刚蒲栋陈洋洋周新喜刘振环
Owner CRRC QINGDAO SIFANG CO LTD