Thermostatic expansion valve

Abstract

The invention relates to a thermostatic expansion valve and belongs to the technical field of refrigeration control. The thermostatic expansion valve comprises a temperature sensing component (3), a transmission component (4) driven by the temperature sensing component (3), a valve body (1), and a valve port (16) formed on the valve body (1), and a valve plug (2) which moves relative to the valve port (16) to change the flow area at the valve port (16); the thermostatic expansion valve is characterized in that: a displacement signal amplification mechanism (5) is arranged between the transmission component (4) and the valve plug (2); and the displacement signal amplification mechanism (5) amplifies a displacement signal of the transmission component (4) and then transmits the amplified displacement signal to the valve plug (2). The thermostatic expansion valve reduces the deformation of a diaphragm, improves the regulation accuracy of a throttling device and the service life and work reliability under the condition that the requirement of external throttling is not changed.

Description

technical field [0001] The invention relates to a thermal expansion valve, which is a device for controlling the throttling amount of the system by adjusting the size of the flow area at the valve port. It belongs to the technical field of refrigeration control, and is suitable for vapor compression heat pump systems, etc., especially for thermal expansion valves used in commercial large-capacity refrigeration systems. Background technique [0002] The thermal expansion valve as a throttling device is widely used in the circuit of the refrigeration system. By sensing the temperature and pressure of the refrigerant at a specific location, the flow of the refrigerant is controlled. With the continuous promotion of commercial refrigeration equipment, the thermal expansion valve is used in commercial It is also widely used in large capacity refrigeration systems. [0003] Such as figure 1 Shown is a thermal expansion valve of existing structure, which includes a valve body 1' ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the working characteristics of commercial large-capacity refrigeration system equipment, it is necessary for the throttling device of the expansion valve to adapt to the environment with a long throttling stroke and frequent fluctuations in the working fluid. The axial displacement of the spool is equal to the axial deformation of the diaphragm. When used in an environment with a long throttling stroke and frequent fluctuations in the working fluid, the diaphragm of the key component will frequently move with a large amount of deformation, which may cause the diaphragm to Cracks, leading to leakage in the refrigeration system, affecting the service life of the valve

Therefore, when the thermal expansion valve of the prior art is used in a commercial large-capacity refrigeration system, there will be technical problems of short working life and poor reliability.

Images