Oct 27 , 2021
How to repair the constant temperature and humidity box?
Constant temperature and humidity box to carry out maintenance?
With the continuous increase of experimental raw materials, small and medium-sized constant temperature and humidity boxes are favored by the masses. Its advantages such as convenience, quickness, and ease of experimentation are used in raw material experiments in various fields (such as testing the characteristic compressive strength of rubber and plastic products, metal materials, and food in a variety of natural environments).
However, with the increase of its application time, the constant temperature and humidity box will also have various common faults. When encountering common failures, we must immediately look for the areas where common failures occur, and “symptomatic treatment” can not delay the time of the experiment. So how to overhaul small and medium-sized constant temperature and humidity boxes?
1: First, you should prepare special tools for maintenance such as (digital multimeter, test pencil, composing screwdriver, needle-nose pliers, vacuum pressure gauge, B-12 gas cylinder, refrigerant, filling pipe, welding tools, etc.).
2: Look for areas with common failures. Here we take common failures of refrigeration compressors as an example. The following regulations should be considered when overhauling:
a: Check if the exhaust pipe of the dry filter device is normal;
b: Check whether the working pressure indication of the vacuum pressure gauge is decreasing and it is in the condition of the vacuum pump. If there is no such thing as the above, you should shut down immediately, and check whether the pipeline, gas tank, and air pressure gauge are not properly connected, and the air inlet air pressure gauge is not in the condition of a vacuum pump, or the welding is blocked due to poor welding. After the cause is established and the fault is detected, Only then can the power supply be connected again for observation. Using this method to exhaust pipes can only remove most of the gases in the capillaries, air-conditioning evaporators, breathing tubes, and refrigeration compressors in the system software, and it is impossible to achieve the purpose of the system software’s aspect ratio vacuum pump. The actual effect of the vacuum pump can be achieved by overhauling it in a relatively short period.
The whole process of repair technology of constant temperature and humidity test box
(1) The constant temperature and humidity test chamber must exhaust the constant temperature and humidity system software in the system software before actual operations such as electric welding can be carried out. Place the constant temperature and humidity test chamber that requires sewage discharge in the natural ventilation slot management center. The closer the technical pipe of the refrigeration compressor to the natural ventilation slot, the better. Then use the pipe cutter to cut the technical pipe (welding machine is not allowed), and drain the sewage; after the sewage is drained, use the pipe cutter to cut the capillaries, and use 1.5CpaN2 to blow the technical pipe for about 30 seconds. After stopping for five minutes, blow for another 30 seconds, and then carry out maintenance; if the refrigeration compressor needs to be replaced, use a pipe cutter to cut the exhaust pipe and the return branch pipe, use N2 to blow out the remaining refrigeration compressor, and then remove it For the refrigeration compressor, each branch pipe of the refrigeration compressor is welded and sealed.
(2) After it is approved that there is no residue, maintenance can be carried out systematically following all normal leak detection, waterproof plugging, replacement of refrigeration compressors, and boring filter devices.
(3) Carry out vacuum packaging for the constant temperature and humidity experiment system software, weld one end of the three-way valve with the compressor technology tube, and connect the other end with a mechanical pump that receives the vapor suitable for inflammable and explosive materials: start the machine The pump is exhausted, and when the research barometer reaches 1atm (1atm=101325Pa), the closed three-way valve interrupts the vacuum packaging curing for 24 hours, and the working pressure does not change to the standard.
(4) When adding constant temperature and humidity system software, to avoid the possibility of electrostatic induction and subsequent flames, all machinery and equipment must be firmly grounded, and there is no doubt that no plugging errors are allowed. The addition of constant temperature and humidity system software is divided into quantitative analysis addition and experience addition.
Quantitative analysis to add the whole process:
(1) Remove the opposite receiving end from the mechanical pump, connect it to the quantitative analysis dosing device, loosen the nut that connects the opposite receiving with the three-way valve, slightly open the filling valve, purge the gas in the pipe, and then close it immediately Type, screw the nut.
(2) Open the addition valve of the quantitative analysis dosing device, open the three-way valve, and let the constant temperature and humidity system software enter the constant temperature and humidity experiment system software; investigate the constant temperature and humidity system software ruler of the quantitative analysis dosing device, and reach the required requirements After that, immediately closed the addition valve.
After the whole process of adding:
(1) Remove the opposite receiving end from the mechanical pump and connect it to the constant temperature and humidity system software bottle, loosen the screw cap that connects the opposite receiver to the three-way valve, slightly open the constant temperature and humidity system software bottle valve, and clean the pipe. The gas is then immediately closed, and the screw cap is tightened.
(2) With the stopper of the refrigerant bottle facing up, open the constant temperature and humidity system software bottle valve, open the three-way valve, and let the constant temperature and humidity system software enter the system software until the working pressure is equalized.
(3) Connect to the switch power supply of the constant temperature and humidity test chamber and start the refrigeration compressor. Due to the actual effect of the refrigeration compressor for liposuction, the constant temperature and humidity system software continue to enter the system software, and the required constant temperature and humidity experiment system is loaded After the specified amount of software, the dexterously closed constant temperature and humidity system software valve, press the constant temperature and humidity system software bottle valve to interrupt the grouting, and then open the bottom pressure valve to fill the remaining constant temperature and humidity system software in the docking plastic hose into the constant temperature Constant humidity experiment system software.
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