Temperature-sensing wax mixture for temperature-sensing component

Abstract

The invention discloses a temperature-sensing wax mixture for a temperature-sensing component, comprising paraffin wax and heat-conducting carbon fibres having a heat conductivity coefficient of greater than 450 w/m.k. A preparation method for the temperature-sensing wax mixture comprises the following steps of: proportioning the paraffin wax and the heat-conducting carbon fibres in a certain proportioning ratio by weight, uniformly mixing, and then grinding for 50-120 hours by adopting a high-energy ball mill under the protection of an inert gas, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, and then obtaining the temperature-sensing wax mixture. According to the temperature-sensing wax mixture, the heat-conducting carbon fibres are used for replacing copper powder, so that the cost is low, and the thermal expansion is good, and the selected heat-conducting carbon fibres have a heat conductivity coefficient of greater than 450 w/m.k, so that a response speed for temperature sense is greatly increased, and adaptability to application occasions with a high sensitivity requirement on the temperature-sensing component can be met; simultaneously, the heat-conducting carbon fibres and the paraffin wax are mixed and then ground by adopting the high-energy ball mill, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, so that the heat sensitivity of the whole temperature-sensing wax mixture can be improved, and the process is simple and beneficial to industrialized production.

Description

technical field [0001] The invention relates to a temperature-sensitive wax mixture used on a temperature-sensitive element. Background technique [0002] The temperature-sensing wax mixture is mainly used on the temperature-sensing element. When the outside of the temperature-sensing element reaches the set temperature, the temperature-sensing wax mixture expands when heated, and can squeeze the rubber tube in the temperature-sensing element, and the rubber tube pushes the push rod in the rubber tube to produce Displacement, so as to drive the valve to open or close, and realize automatic temperature control. The response speed of the temperature-sensitive wax mixture to temperature induction directly affects the sensitivity of the temperature-sensing element. At present, the temperature-sensitive wax mixture is mainly composed of copper powder and paraffin. As a temperature-sensitive material, paraffin has the advantage of good thermal expansion, but it still exists as an ...

AI Technical Summary

Problems solved by technology

The response speed of the temperature-sensitive wax mixture to temperature induction directly affects the sensitivity of the temperature-sensing element. At present, the temperature-sensitive wax mixture is mainly composed of copper powder and paraffin. As a temperature-sensitive material, paraffin has the advantage of good thermal expansion, but it still exists as an organic matter. The disadvantage of low thermal conductivity leads to slow response to temperature induction, and the addition of copper powder improves the response speed of paraffin wax to temperature induction, but the thermal conductivity of copper is only 397w / m·k, which still makes the temperature sensing element There is a certain hysteresis, which cannot meet the application occasions that require high sensitivity of the temperature sensing element