Self-operated three-way valve used for coolant circulating type machine room special machine

Abstract

The invention provides a self-operated three-way valve used for a special machine in a refrigerant circulation parallel machine room. The three-way valve comprises a valve body, a low pressure air inlet pipe, a high pressure air inlet pipe and an exhaust pipe. The valve body is internally provided with a piston component, a valve seat and a sliding valve. The internal chamber of the valve body is divided into a low pressure chamber and a high pressure chamber by a piston which can axially move. A low pressure capillary is connected between the low pressure chamber and the low pressure air inlet pipe. A low pressure capillary is connected between the high pressure chamber and the high pressure air inlet pipe. The low pressure chamber and / or the high pressure chamber are / is internally provided with a spring. By the pressure difference of the suction and exhaust when a spring force and a compressor are stated, the piston component which is arranged in the valve body drives the sliding valve to be closely attached to the surface of the valve seat to slide, thus achieving the communication between the high pressure air inlet pipe and the exhaust pipe and the communication between the low pressure air inlet pipe and the exhaust pipe. The three-way valve needs no outside power, can achieve the free switching of refrigerant refrigeration circulation and the natural circulation just according to the running state of the compressor, thus sufficiently displaying the energy-saving advantage of the special machine in the refrigerant circulation parallel machine room and improving the operation reliability.

Description

technical field [0001] The invention relates to a self-operated three-way valve for a special machine room with refrigerant circulation combined, which belongs to the automatic control valve of fluid machinery, and is especially suitable for a special machine room with natural circulation of refrigerant and uses the self-operated three-way valve to switch the refrigerant flow direction , to realize the conversion of natural circulation and refrigeration cycle. Background technique [0002] With the widespread application of large computers and the popularization of mobile communications, special machine equipment in computer rooms has been widely used. Since the special machine in the computer room is a direct evaporative air-conditioning system that operates throughout the year, it is still necessary to cool down the computer room even in the cold winter (when the external temperature is very low), resulting in extremely high operating costs throughout the year. The start-...

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Problems solved by technology

[0006] (1) Since the solenoid valve has a sealing ring inside, frequent actions or long-term work in a high-temperature environment will easily cause deformation or denaturation of the sealing ring, causing the solenoid valve to lose its sealing performance and fail to achieve the closing effect; on the other hand, the use of solenoid valves The service life is limited. When a certain number of opening and closing times is exceeded, the solenoid valve will fail, resulting in the failure of the special machine in the computer room.

[0007] (2) The solenoid valve needs electric power as power, and it is always charged when it is turned on, which consumes electric energy in vain

[0008] (3) The valve port of the solenoid valve is a local resistance component for the flow of refrigerant. Whether it is a refrigeration cycle or a natural circulation, it will cause the pressure of the refrigerant to drop and affect the performance of the special machine in the computer room; especially when the refrigeration cycle solenoid valve 9 appears When the failure cannot be started, the compressor cannot suck the gas in the evaporator 6, which will increase the exhaust temperature of the compressor 10 and burn the compressor

[0009] Although the natural circulation of refrigerant combined with the machine room special machine has the advantages of high efficiency and energy saving in principle, the reliability of the natural circulation solenoid valve 7 and the refrigeration cycle solenoid valve 9 that open and close reciprocally is an important reason that hinders the popularization and application of the machine room special machine

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