Double-damping thermal expansion valve with effect of reducing vibration and noise

Abstract

The invention discloses a double-damping thermal expansion valve with the effect of reducing vibration and noise. The double-damping thermal expansion valve comprises a valve body, a power head, an O-shaped valve, an ejecting needle, an ejecting rod sleeve, a ball seat part, a damping clamp, springs and adjusting caps, wherein spherical column-pin convex bags protruding outwards are arranged on the outer side surfaces of the lower parts of column pins under the damping clamp and are in elastic and sliding contact with step hole walls of the upper parts of adjusting-cap installing holes, so that the radial vibration of a ball seat is reduced; the ejecting rod sleeve is a mushroom-shaped nylon member; and arc-shaped convex ribs are arranged at the lower parts of four flanges of the ejecting rod sleeve and are contacted with the inner hole walls of a lower cover of the power head, axial vibration of the ball seat is reduced, the interference of vibration fields of refrigerant airflow and a car on a steel-ball valve core is reduced, and the purpose of eliminating vibration and noise in operation of an air-conditioning system of the car is achieved. In addition, the valve body is formed by machining a novel aluminum profile of which redundant materials are removed under the premise of guaranteeing enough wall thickness of all holes, so that the use amount of the materials is reduced and the cost of a product is reduced.

Description

technical field [0001] The invention relates to the field of automobile air conditioners, and more specifically relates to an expansion valve. Background technique [0002] The expansion valve is an important part of the automobile air-conditioning refrigeration device, and it is one of the four basic equipments in the refrigeration system. The superheat at the outlet of the evaporator is used to adjust the flow of refrigerant sent to the evaporator. The principle of the expansion valve’s control of the refrigerant flow is that the power head senses the superheat at the outlet of the evaporator, and the pressure difference caused by the superheated refrigerant and the saturated refrigerant in the power head drives the opening and closing of the valve hole, so that as much refrigerant as possible enters Evaporator, so that the evaporator can play its best performance. [0003] The abnormal vibration and noise of vehicle air-conditioning system has been plagued by the entire...

AI Technical Summary

Problems solved by technology

[0004] The prior art adopts various technical solutions in order to solve the resonance noise problem of the system by improving the thermal expansion valve, such as increasing the spring preload in the thermal expansion valve, increasing the cross-sectional diameter of the sealing ring, increasing the weight of the top plate, reducing the Measures such as the diameter of the small valve core ball, because the above-mentioned measures are too simple, the effect of vibration reduction and noise reduction is not obvious

For example, a damping clip is added to the bead seat above the spring to reduce the radial vibration generated by the bead seat when the refrigerant flows through, in order to avoid the natural vibration frequency of the car engine and achieve the effect of peak-shift vibration reduction, but due to the The vibration field is drifting and changing, not a natural frequency. In addition, the axial vibration of the transmission rod has not been resolved, so it cannot completely eliminate noise.

In addition, the valve body of the expansion valve in the prior art is made of square aluminum profiles, the cost is relatively high, and there is room for improvement

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