Throttle structure and pressure drop device

Abstract

The invention discloses a throttling structure and a pressure drop device. The throttling structure comprises a valve needle, a valve body and a valve seat core, wherein the valve seat core is fixed to the valve body. A through hole in smooth transition is formed in the valve seat core and is matched with the valve needle in shape. The valve needle is inserted into the through hole and forms a throttling round ring with the through hole. The pressure drop device comprises the throttling structure. The throttling structure and the pressure drop device achieve two-stage throttling, and therefore good and smooth transition of the differential pressure change before throttling and after throttling is guaranteed, the possibility of two phase caused when liquid refrigerating fluid flows through a throttling hole is reduced, and the heat exchange efficiency of a system is improved. Meanwhile, the possibility of turbulence vortex forming in the downstream of the throttling hole and dropping is reduced, related noise problems are avoided, and the noise quality of products can be improved.

Description

technical field [0001] The invention relates to the technical field of throttling and pressure reduction, in particular to a throttling structure and a pressure drop device. Background technique [0002] The throttling structure of the traditional electronic expansion valve is as follows: figure 1 As shown, the entire throttling structure is mainly composed of a valve needle 100, a valve body 200 and a valve seat core 300. By adjusting the upper and lower positions of the valve needle 100 and adjusting the size of the throttling ring hole, throttling with different openings is realized. The fluid enters the cavity of the valve body 200 laterally, passes through the narrow ring hole formed by the valve needle 100 and the valve seat core 300, and flows out vertically, realizing a first-stage throttling. [0003] In the traditional throttling structure, the pressure difference before and after the throttling is large, the flow velocity of the refrigerant drops rapidly along th...

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Problems solved by technology

[0003] In the traditional throttling structure, the pressure difference before and after the throttling is large, the flow velocity of the refrigerant drops rapidly along the flow channel, and more kinetic energy dissipated by the refrigerant is converted into heat energy, so that the liquid refrigerant is easy to form bubbles and generate gas. Liquid two-phase state, affecting heat transfer efficiency

At the same time, a pulsating turbulent vortex is easily formed downstream of the throttle hole, accompanied by the phenomenon of turbulent vortex shedding, such as Figure 3-a As shown, resulting in corresponding noise problems, affecting the noise quality of the product

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