Differential pressure control method of refrigerating unit and refrigerating unit
A refrigeration unit and control method technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of compressor operation reliability decline, etc., to solve the operation reliability decline, reduce the cost increase of the whole machine, and avoid failures downtime effect
Active Publication Date: 2015-04-29
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] In view of the status quo of the prior art, the purpose of the present invention is to provide a differential pressure control method of a refrigeration unit and the refrigeration unit, which avoids failure shutdowns caused by frequent system differential pressure protection, and solves the problem of compressor failure due to small system pressure differentials. The problem of reduced operational reliability, especially for refrigeration units with screw compressors
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[0044] As an implementable manner, the following steps are also included,
[0045] When the opening degree of the electronic expansion valve 5 of the economizer>the first preset opening degree value ekd_EXV1, the electric heating of the liquid reservoir 9 is turned on;
[0046] When the second preset opening value ekd_EXV2≤the opening of the economizer electronic expansion valve 5≤the first preset opening value ekd_EXV1, the electric heating of the liquid reservoir 9 maintains the original state;
[0047] When the opening degree of the electronic expansion valve 5 of the economizer is smaller than the second preset opening degree value ekd_EXV2, the electric heating of the liquid reservoir 9 is turned off;
[0048] Wherein, the first preset opening value ekd_EXV1 is greater than the second preset opening value ekd_EXV2.
[0049] When the refrigerating unit exits the regulation mode of low system differential pressure, the opening of the economizer electronic expansion valve 5...
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The invention provides a differential pressure control method of a refrigerating unit. The differential pressure control method comprises the following steps of setting minimum differential pressure deltaP0 for the reliable operation of a compressor of the refrigerating unit; detecting system differential pressure deltaP of the refrigerating unit; comparing the deltaP with the deltaP0; when detecting that the duration time of a condition that the deltaP is less than the deltaP0 reaches first pre-set time t1, enabling the refrigerating unit to enter a system differential pressure excessively-low adjusting mode; opening a system electronic expansion valve to a target opening degree; when the deltaP is more than P, enabling the refrigerating unit to quit the system differential pressure excessively-low adjusting mode; and recovering the system electronic expansion valve to an initial-state adjusting manner to be operated, wherein the P is a set pressure value. The invention further relates to the refrigerating unit. According to the differential pressure control method of the refrigerating unit and the refrigerating unit, the failure shutdown caused by frequent system differential pressure protection is avoided and the problem that the operation reliability of the compressor is reduced due to the fact that the system differential pressure is small, is solved; the differential pressure control method is particularly suitable for the screw rod compressor refrigerating unit, the control on an oil pump is reduced and the cost increase caused by the fact that the oil pump is used is reduced.
Description
technical field [0001] The invention relates to the refrigeration field, in particular to a pressure difference control method of a refrigeration unit and the refrigeration unit. Background technique [0002] Screw compressors are currently widely used in commercial refrigeration units. The differential pressure control of the screw unit is related to the reliable operation of the refrigeration unit, and its oil circuit circulation is the main factor affecting the reliability of the compressor operation. [0003] The compressor mainly relies on the pressure difference of the system to return oil. When the difference between the high and low pressure of the system is small, it will be difficult for the unit to return oil, and the compressor will experience failure of the energy regulation system, insufficient lubrication, and serious damage to the compressor. Therefore, the control of unit pressure difference is very important. At present, there are two main measures to solv...
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IPC IPC(8): F25B49/02
CPCF25B49/02F25B41/31
Inventor 黄凯亮钟海玲孙雷鸣胡乾龙吉剑林
Owner GREE ELECTRIC APPLIANCES INC