Refrigeration system throttling capillary tube length determining method

Abstract

The invention discloses a refrigeration system throttling capillary tube length determining method. A refrigeration system is started, under the needed evaporation pressure value and evaporation temperature value, a manual expansion valve and the filling amount of a refrigerant in a refrigeration system are adjusted till the refrigeration effect of the refrigeration system is optimal; the apertureposition of the manual expansion valve is fixed; the manual expansion valve is taken out and arranged between a pressure reduction valve and a second low-pressure meter, gas injection is conducted, the output pressure of the pressure reduction valve is adjusted, the pressure value displayed by the second low-pressure meter is equal to the needed evaporation pressure value, and the flow value displayed through a flow meter at the time is recorded; a throttling capillary tube with the length larger than the estimated length is arranged between the pressure reduction valve and the second low-pressure meter, gas injection is conducted, the pressure reduction valve is adjusted, and the pressure value displayed by the second low-pressure meter is equal to the needed evaporation pressure value;and the length of the throttling capillary tube is constantly reduced through shearing, the flow value displayed by the flow meter is observed till the flow value displayed by the flow meter is the same with the above recorded flow value, and the length of the throttling capillary tube at the time is the optimal length.

Description

technical field [0001] The invention relates to a throttling and pressure-reducing element in a compression refrigeration system, in particular to a method for determining the length of a throttling capillary in a refrigeration system. Background technique [0002] In many small compression refrigeration systems nowadays, the throttling and pressure-reducing devices mostly use capillary tubes, because compared with automatic expansion valves, thermal expansion valves and thermoelectric expansion valves, capillary tubes have a simpler structure, no moving parts, and no components. Less wear and sticking, less failure and less cost. Moreover, when the unit is shut down, the pressure in the system can be balanced more quickly, and the starting load of the motor is minimized. However, factors such as the inner diameter and tube length of the capillary should be considered in the design of the capillary. Especially after roughly calculating the inner diameter of the capillary, i...

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