An important instruction module in the installation and maintenance of screw chiller is the installation of the expansion valve of screw chiller, and this chapter also focuses on this part of the detailed explanation!
First, the expansion valve of the screw chiller should be installed as close to the evaporator as possible, so that the throttled low-temperature refrigerant immediately enters the evaporator to absorb heat and refrigerate. At the same time, the convenience of adjustment and disassembly should also be considered. When the expansion valve supplies liquid to multiple steamed coils, a distributor should be installed behind the valve to ensure the uniformity of the liquid supplied to each evaporation coil. If the resistance of the distributor is large, an external balanced thermal expansion valve should be installed. A filter or a filter drier should be installed on the expansion valve to remove garbage or moisture from the system to prevent the expansion valve from being blocked and affect the normal circulation of the refrigerant.
Secondly, the installation of the temperature sensing package; the temperature felt by the temperature sensing package will directly affect the opening of the expansion valve. The temperature sensing package should be installed on the suction pipe at the outlet of the hair dryer. Heater or heat exchanger. The temperature sensor should be installed on the suction pipe flowing out of the regenerator. The contact part of the temperature-sensing bag and the suction pipe should be straight and clean. There should be good heat transfer between the two. The temperature-sensing bag and the suction pipe should be fastened with straps, and heat-insulating materials that do not absorb moisture should be used for heat insulation. The temperature-sensing bag should be installed on the suction pipe which is not easy to accumulate fluid. When the diameter of the suction pipe is less than 21mm, the temperature-sensing package is placed on the upper part of the suction pipe. When the diameter is larger than the diameter, the temperature-sensing bag is installed on the horizontal axis of the suction pipe. The lower part is about 45.1 °.
Finally, the installation of the external balance tube. The external balance pipe should be installed at the outlet of the evaporator, and should be behind the temperature sensing package. The two positions cannot be interchanged, because a very small amount of refrigerant liquid inside the expansion valve may leak into the external balance pipe and reach the suction pipe. If the temperature-sensing package is behind the interface, the temperature accepted by the temperature-sensing package is low, and the expansion valve opening is insufficient, which affects the operation of the refrigeration unit.
The knowledge section of the screw chiller expansion valve installation is introduced here. For more related knowledge, please pay attention to the official website of Guansheng Machinery Company http://ylscps.com or call: Miss Liang13929219931 Mr. Dai: 13804529919
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