Control system and control method for economizer valve of centrifugal unit
A centrifugal unit and control system technology, applied in refrigeration and liquefaction, refrigerators, refrigeration components, etc., can solve the problems of compressor secondary impeller easy to absorb liquid, refrigerant stagnation, etc.
Active Publication Date: 2021-01-26
YANTAI EBARA AIR CONDITIONER +1
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[0003] Under some working conditions, such as when the pressure difference between the evaporator and the condenser is low, the refrigerant in the economizer stagnates, and when the economizer valve is opened, the second impeller of the compressor is easy to absorb liquid
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[0041] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0042] Please refer to figure 1 , figure 1 It is a schematic diagram of a specific embodiment of the centrifuge unit provided by the present invention.
[0043] The centrifugal unit in this embodiment includes a condenser 20, an evaporator 30, a compressor 10, and an economizer 50, and the inlet of the compressor 10 is provided with a guide vane 101, figure 1 The middle white arrows mark the circuit of the medium. The medium flowing out of the outlet of the compressor 10 flows to the condenser 20. After being condensed in the condenser 20, after being throttled by the first throttling member 60, it enters the economizer 50. The economizer 50 divides the medium into two parts, most of which are mainly After being thrott...
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The invention discloses a control system and control method for an economizer valve of a centrifugal unit. The centrifugal unit includes a condenser, an evaporator, and a compressor. Guide vanes are provided at the inlet of the compressor. The control system includes: a controller storing a closed area, The opening degree of any guide vane in the closed area, and under the pressure difference between the condenser and the evaporator, when the economizer valve is closed, the efficiency of the compressor is higher than that when the economizer valve is open; it also includes the pressure detection element and the opening The degree detection element is used to obtain the current pressure difference between the condenser and the evaporator and the current opening degree of the guide vane in real time; the controller judges that the current opening degree and the current pressure difference are in the closed area, and then controls the economizer valve to close. In this system and method, the opening of the guide vane and the pressure difference between the condenser and the evaporator are taken into consideration at the same time, and the closing area of the economizer valve is limited to a relatively reasonable range, which not only avoids the influence of liquid suction on the efficiency of the compressor, but also Avoid excessively expanding the closing condition of the economizer valve to reduce the performance of the unit.
Description
technical field [0001] The invention relates to the technical field of centrifugal units, in particular to a control system and control method for an economizer valve of a centrifugal unit. Background technique [0002] The centrifugal unit includes a condenser, an evaporator, a compressor, and an economizer valve, and guide vanes are provided at the inlet of the compressor. The refrigerant flowing out of the compressor outlet flows to the condenser, and after being condensed in the condenser, it enters the economizer. The economizer divides the refrigerant into two parts, most of which are mainly cooling liquid medium and enter the evaporator, and return to the The compressor, and another part of the gaseous medium in the economizer, will pass through the economizer valve and finally enter the compressor's secondary impeller inlet. The opening of the guide vane at the inlet of the compressor is determined according to the working conditions. [0003] Under some working co...
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IPC IPC(8): F25B49/02
Inventor 山田宏幸李景富段连涛蔡万禄仙田卓宽宋志光
Owner YANTAI EBARA AIR CONDITIONER