Specifically analyze the seven structures and performances of high and low temperature test chambers
As the saying goes, "A good man and three gangs" is also a high-quality high-temperature test chamber, and it is inseparable from the support and operation of various internal systems. In order to let users know the structure and function of the high and low temperature test chambers, the technical department of Dongguan Haotian Test Equipment Co., Ltd. has made the following skills display for customers to learn.
1 , oil separator
The oil separator can recirculate a large part of the compressor lubricating oil brought out from the exhaust port of the compressor. Some of the oil passes through the circulation of the system and is recirculated by the compressor suction port together with the refrigerant, if the system returns poorly. Gradually collecting oil in the system will still cause failures in heat exchange efficiency and lack of oil in the compressor. On the contrary, regarding the refrigerant which is slightly soluble in oil such as R404a , the oil separator adds the saturation of the refrigerant oil. Regarding large-scale systems, because the system piping is relatively thick, usually the oil return is smoother and the oil quantity is more. The oil separator is more suitable, while the small system, the smooth return of the system is the key to the oil circuit, the oil separator The effect is not big.
2 , liquid trap
The liquid accumulator is such that the refrigerant that is not condensed in the refrigeration system does not enter or enter the circulation system, and the heat exchange efficiency is improved, but together, the refrigerant charge amount is added and the condensation pressure is low. Regarding the small system, the circulation flow is not large, and it is completely capable of reaching the effusion through the pipeline processing skill.
3 , transpiration pressure regulating valve
The transpiration pressure regulating valve is usually used in the dehumidification system to control the transpiration temperature so that the transpiration machine does not frost. However, in the unipolar circulation system, the transpiration pressure regulating valve should be connected to the refrigeration return air solenoid valve, which makes the pipeline layout complicated, which is not conducive to the smooth system. At present, some test chambers are not equipped with transpiration pressure regulating valves.
4 , heat exchanger
The heat exchanger has three advantages. One is to make the condensed refrigerant supercool, to reduce the amount of pre-gasification in the pipeline, and the second is to make the return gas refrigerant fully vaporized and reduce the risk of liquid shock. The third is to improve the system. effect. However, the access of the heat exchanger complicates the system, and if the pipeline is not placed, the tube damage will be added. It is not conducive to the company's commodity equipment for small batch production.
5 , check valve
Because the system is applied to multiple circulating branches, a check valve is installed at the return port of the unoperated circulating branch to prevent the refrigerant from flowing back into the unoperated circulating space. If the gas accumulation in the pipeline does not affect the operation of the system, it is necessary to avoid liquid accumulation. Therefore, not all sub-circuits must be equipped with a check valve.
6 , gas-liquid separator
For the refrigeration system of the loop test equipment with variable working conditions, the gas-liquid separator is one of the effective methods to avoid liquid blow, and the cooling capacity can be appropriately adjusted together. However, the gas-liquid separator also cuts off the system oil return, so it is necessary to install the oil separator for the gas-liquid separator. With regard to the unit consisting of Taikang fully enclosed compressor, the gas-liquid separator can be omitted because it has a proper buffer space in the return port and can perform a certain gasification. Units with limited installation space can be equipped with a thermal bypass to gasify excess backflow.
7 , cold PID control
Cold PID control has a significant effect on energy saving. Not only that, but in the normal temperature range ( about 20 °C ) where the temperature field of the heat balance method is relatively poor, the system of cold PID control can achieve the ideal target ; in constant temperature and humidity It can also perform well, so the cold PID control is already the first skill in the ring test commodity refrigeration system. The cold quantity PID control has two kinds of time share and opening share. The time share is the ratio of operating the cold solenoid valve in one time cycle, and the opening share is the conduction amount of the electronic expansion valve.
However, in the time share control, the life of the solenoid valve is a bottleneck. At present, the better solenoid valve on the market is estimated to have a life expectancy of only 3 to 5 years. Therefore, it is necessary to calculate whether the protection cost is lower than the energy saving. The electronic expansion valve in the opening share control is currently at a higher price, and the market is inconvenient to purchase, because it is also a dynamic balance, also involving life doubts.
After the skills of the above seven systems, under normal circumstances, the fundamental operation of high and low temperature test chambers is mastered. Together, we have to gradually understand the functions of the high and low temperature test chambers in the process of actually using the high and low temperature test chambers. We are really skilled in operating the equipment and let it be used by me, so that we can fully express a high and low temperature test chamber. the value of. Specifically analyze the seven structures and performances of high and low temperature test chambers
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