Throttling control element based on memory alloy

Abstract

The invention discloses a throttling control element based on memory alloy. The throttling control element comprises a shell, a shape memory alloy spring and a valve rod, wherein the shape memory alloy spring and the valve rod are arranged in the shell; a controller controls the displacement of the shape memory alloy by controlling the heating power of a heating rod, and meanwhile, a relation curve of the strain of the shape memory alloy spring and the resistance of the shape memory alloy spring is approximately linear; the accurate position of the valve rod is obtained by sampling the resistance of the memory alloy in real time, so that closed-loop control of a system is achieved, a refrigerant channel connected to an inlet and an outlet of the shell in parallel is further arranged in the shell, the refrigerant channel flows through the shape memory alloy spring, and the opening degree of the valve rod is adjusted by controlling the flow of a refrigerant in the refrigerant channel and adjusting the deformation quantity of the memory alloy spring through a heating mechanism. According to the throttling control element, execution precision and closed-loop control of throttling device valve opening degree control are guaranteed, and meanwhile, the throttling control element has the advantages of being low in cost, high in precision, good in reliability and the like.

Description

technical field [0001] The invention relates to a technology in the field of vehicle air conditioners, in particular to an air conditioner flow control element based on a memory alloy. Background technique [0002] In the field of refrigeration technology, the throttling device is an important component of the refrigeration system. Its function is to throttle and reduce the high-temperature and high-pressure liquid refrigerant flowing out of the condenser to obtain a low-temperature and low-pressure two-phase refrigerant fluid, which is used to regulate The refrigerant flow into the evaporator provides the most suitable cooling effect for the system. [0003] The existing electronic expansion valve is driven by a stepping motor to achieve active control. Usually, the number of pulse steps is used to roughly estimate the opening. In actual use, the stepping motor is often out of step, which leads to confusion in the control logic and oscillation of the system, which cannot me...

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Problems solved by technology

[0003] The existing electronic expansion valve is driven by a stepping motor to achieve active control. Usually, the number of pulse steps is used to roughly estimate the opening. In actual use, the stepping motor is often out of step, which leads to confusion in the control logic and oscillation of the system, which cannot meet the requirements of use.

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