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Supermarket refrigerated showcase Liquid level adjustment principle
author: supermarket refrigerated showcase category: commercial refrigeration Views: 515Time: 2016-08-22
Supermarket refrigerated showcase Liquid level adjustment principle
Operation principle: When the liquid level in the evaporator (or intercooler) drops, the liquid level in the valve body also drops, and the floating ball falls. The needle valve opens the valve hole larger, so the supermarket refrigerated showcase increases the liquid supply; on the contrary, when the profile rises, the float rises, the valve hole opening decreases, and the liquid supply decreases; and when the liquid level rises to a certain limit When the valve hole is closed, the liquid supply is stopped, so the adjustment of the float valve to the liquid supply is a proportional adjustment. The flow of liquid in straight-through and non-straight-through float valves is different. In the straight-through float valve, the liquid first flows into the shell after throttling through the valve hole, and then enters the evaporator (or intercooler) through the liquid connecting pipe. The steam generated during throttling enters the evaporator (or intercooler) through the gas connecting pipe. In the non-straight-through supermarket refrigerated showcase, the liquid does not enter the valve body, but uses a separate pipeline to enter the evaporator (or intercooler). The straight-through float valve is relatively simple, but the liquid level fluctuates greatly due to the impact of the entering liquid in the valve body, which makes the operation of the float valve unstable; and the flow of liquid from the valve body into the evaporator (or intercooler) depends on the liquid level Poor, so it can only supply liquid below the liquid level. The non-straight-through float valve is more stable and can supply liquid to any place, because the pressure after throttling is higher than the pressure of the evaporator (or intercooler). In large-scale refrigeration devices, the non-straight-through float valve can also be used as a sensing mechanism, and the pneumatic main valve can be used as an actuator to jointly realize the adjustment of the liquid supply. The power element of the pneumatic main valve is a diaphragm. When the liquid level in the evaporator is low, the float valve is in working condition, so that the space above the diaphragm is connected to the high pressure side (but through the throttling of the float valve hole in the middle), so the diaphragm bends down and passes the supermarket The refrigerated showcase push rod makes the valve core move down, the valve hole is opened, and the liquid enters the evaporator through throttling. The opening degree of the pneumatic main valve changes with the pressure above the diaphragm, so it belongs to proportional adjustment. When the liquid level in the evaporator rises to a certain limit, the float valve is closed, and the space above the diaphragm is disconnected from the high-pressure side. The remaining liquid flows down through the small hole, and the pressure on the upper and lower diaphragms is balanced, so the action of the spring The lower pneumatic main valve is closed. The elasticity of the spring can be adjusted with a setting screw.
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