Control system and method of economizer valve of centrifugal unit
A centrifugal unit and control system technology, applied in refrigeration and liquefaction, refrigerators, refrigeration components, etc., can solve problems such as refrigerant stagnation, compressor secondary impeller easy to absorb liquid, etc.
Active Publication Date: 2019-06-11
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 media. The medium flowing out of the outlet of the compressor 10 flows to the condenser 20, and after being condensed in the condenser 20, after being throttled by the first throttling member 60, it enters the economizer 40, and the economizer 40 divides the medium into two parts, most of which are mainly After being...
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The invention discloses a control system and method of an economizer valve of a centrifugal unit. The centrifugal unit includes a condenser, an evaporator, and a compressor, wherein a guiding blade isarranged at an inlet of the compressor; the control system includes a controller, a pressure detecting element, and an opening detecting element, wherein a closing zone is stored in the controller, when opening of any guiding blade and pressure difference of the condenser and the evaporator are in the closing zone, and an economizer valve is closed, the efficiency of the compressor is higher thanthe efficiency of the economizer valve during starting; the pressure detecting element and the opening detecting element are used for acquiring current pressure difference of the condenser and evaporator, and current opening of the guiding blade; and when the controller determines that current opening and the current pressure difference are in the closing zone, the economizer valve is controlledto close. According to the system and method, opening of the guiding blade and the pressure difference of the condenser and the evaporator are considered as consideration factors at the same time, theclosing zone of the economizer valve is limited within the relatively reasonable range, influence of imbibition on the efficiency of the compressor is avoided, and excessive expansion of closing conditions of the economizer valve is avoided, and unit performance is reduced.
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