Variable area ratio ejector based on electronic expansion valve

Abstract

A variable area ratio ejector based on an electronic expansion valve comprises an electric adjusting device, an inlet segment, a nozzle, a suction chamber, a mixing chamber and a diffusion segment. The electric adjusting device comprises a valve seat, a thread transmission mechanism, a rotor, a coil and a needle valve. The needle valve penetrates through the inlet segment to extend to the nozzle. The nozzle, the suction chamber and the mixing chamber are connected sequentially. The needle valve is arranged in the inlet segment. A valve rod is connected with the rotor. The coil is arranged outside the rotor. The needle valve extends to the inlet segment so as to adjust the cross section area of a nozzle throat and change the area ratio of the ejector. According to a specific operation process in a refrigeration system, when the adjusting device is closed completely, the needle valve is completely attached to the nozzle, and the flow quantity of primary flow is zero; and when the adjusting device is opened completely, the needle valve gets away from the nozzle completely, and the flow quantity of the primary flow is maximum. Adjustment of the flow quantity under the variable working condition is achieved through the adjusting device of the electronic expansion valve, throttling loss in the refrigeration can be fully recycled, and energy waste is reduced. The characteristic of the small size of the electronic expansion valve is utilized, implementation is easy, and installation is convenient.

Description

technical field [0001] The invention relates to a variable area ratio ejector based on an electronic expansion valve, which is applied in the technical field of refrigeration. Background technique [0002] Taking the application of the ejector in the field of refrigeration as an example, its working principle is to use the high-pressure superheated refrigerant vapor (primary flow fluid) to increase the flow rate and reduce the pressure after passing through the main nozzle, so as to generate a vacuum effect in the suction chamber and suck the superheated refrigerant from the evaporator. Steam (secondary flow fluid), the secondary flow fluid is accelerated by the injection nozzle and mixed with the primary flow fluid in the equal-section mixing chamber, and then passes through the diffusion section, the speed decreases and the pressure rises. Applying ejector technology to the field of refrigeration can use low-grade heat energy to achieve the purpose of refrigeration, which ...

AI Technical Summary

Problems solved by technology

The injector uses the steam inlet pipe to drive the nozzle to move horizontally, so the position of the nozzle in the main body can be adjusted, thereby changing the initial contact position of the high-pressure steam and the low-pressure steam, and realizing the adjustability of the injector under changing working conditions, but the injection The device has high requirements on the technology of the steam inlet section, and there is a certain delay in the movement of the nozzle

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