Temperature switch based on phase change and volume change effect of low-melting point metal

A low-melting-point metal and temperature switch technology, which is applied to thermal switch components and other directions, can solve the problems of no substantive innovation, etc., and achieve the effects of large pressure resistance, long-term stable operation, and rapid temperature rise and fall

Active Publication Date: 2012-07-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, it is only a certain optimization and adjustment on the structure of the traditional paraffin-type temperature switch, and there is no substantial innovation.

Method used

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  • Temperature switch based on phase change and volume change effect of low-melting point metal
  • Temperature switch based on phase change and volume change effect of low-melting point metal
  • Temperature switch based on phase change and volume change effect of low-melting point metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 shows a typical application of the temperature switch based on the volume change effect of the phase transition of the low melting point metal of the present invention. figure 1 It is a structural schematic diagram when the temperature switch is in a closed state; figure 2 It is a structural schematic diagram when the temperature switch is in an open state.

[0035] Such as figure 1 with figure 2 As shown, the low melting point metal phase transition temperature switch of the present embodiment consists of a hollow housing 1, a fixed rod 2, a hollow piston 3, a spring 4, and a space 5 filled between the top of the fixed rod 2 and the inner top of the hollow piston 3 The liquid metal composition in

[0036] In this embodiment, a fluid inlet J1 is provided on the side wall of the hollow housing 1 and a fluid outlet C1 is opened on the top wall of the hollow housing 1;

[0037] The fixed rod 2 is vertically fixed on the inner bottom end wall of the hollo...

Embodiment 2

[0046] Embodiment 2 shows a typical application of the temperature switch based on the phase transition volume change effect of the low melting point metal of the present invention as an automobile thermostat; image 3 , Figure 4 A schematic diagram of its structure.

[0047] Such as image 3 with Figure 4 As shown, the structure of the temperature switch based on the low-melting point metal phase transition volume change effect of this embodiment is basically the same as that of Embodiment 1, the difference is:

[0048] A fluid inlet J1 and two fluid outlets (a small circulation outlet Cx located at the bottom of the side wall of the hollow housing 1 and a large circulation outlet Cd located on the top wall of the hollow housing 1) are provided on the hollow housing 1; The heated cooling water of the automobile engine 8 flows in from the fluid inlet J1 located in the middle of the side wall of the hollow casing 1, and the hot water flowing out through the small circulati...

Embodiment 3

[0053] Example 3 shows a typical application of the temperature switch based on the phase transition volume change effect of the low-melting point metal of the present invention as a thermostatic water mixing valve. Figure 5 A schematic diagram of adjusting the mixing ratio of cold and hot water for the thermostatic mixing valve to ensure a constant outlet water temperature.

[0054] Such as Figure 5 As shown, the structure of the temperature switch based on the volume change effect of the low-melting point metal phase transition in this embodiment is basically the same as that in Embodiment 1, the difference is:

[0055] This embodiment has two fluid inlets (hot water inlet J1 and cold water inlet J2) and one fluid outlet (mixed water outlet C1). Cold and hot water enter from their respective inlets, mix in the water mixing valve, and then flow out through the mixing water outlet C1.

[0056] The materials of the hollow casing 1, the fixed rod 2 and the hollow piston 3 in...

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Abstract

The invention relates to a temperature switch based on phase-change effect of a low-melting point metal, which comprises a hollow shell, a fixed rod, a hollow piston, a spring and a liquid metal filled between the fixed rod and the hollow piston, wherein at least one inlet and one outlet for ingress and egress of a fluid are arranged on the hollow shell; the fixed rod is fastened on the inner bottom surface of the hollow shell; the piston is tightly sheathed on the outer wall of the fixed rod, and two ends of the piston are respectively connected with the shell and the piston; and when the temperature changes and the low-melting point metal generates phase change, the piston can move relative to the fixed rod under the actions of an expansive force of the metal and a returning force of the spring, and the fluid inlet and outlet on the shell opens or shuts caused by the movement of the piston, so that the functions of open and shut at different temperatures are realized. By fully utilizing the heat physical properties of high heat conductivity and low thermal capacity of the liquid metal, the temperature switch responds very sensitive; simultaneously, because the liquid metal is numerous in variety, the temperature switch is wide in the selection of threshold; and the temperature switch can be widely applied to the fields of intelligent building, residual-heat utilization, industrial heat management, microfluidic chips and the like.

Description

technical field [0001] The invention relates to a temperature switch, in particular to a temperature switch based on the phase transition effect of the low melting point metal which utilizes the volume change effect of the low melting point metal at its phase transition temperature point to drive the movement of the piston and control fluid entry and exit. Background technique [0002] A temperature switch is defined as a device that can sense a specific temperature and make a corresponding mechanical action. Typical applications include automotive thermostats, building heating and ventilation controls, thermostatic mixing valves, overheating protection for electronic devices, and more. At present, there are three mainstream temperature switches: bimetal type, paraffin type and memory alloy type. Due to the limited driving force and stroke of the bimetal, and the manufacturing and processing of the memory alloy is complicated and costly, the most widely used one is still th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H37/44
Inventor 邓月光刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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