wax thermostat

Abstract

The invention discloses a wax-type thermostat, which comprises a bracket, a casing, a reverse push rod with one end fixed on the bracket, an inner tank, a plug and a paraffin filler arranged in the casing, and the paraffin filler is placed in the plug In the accommodating cavity formed by sealing with the inner tank, the free end of the anti-push rod extends into the accommodating cavity, and the free end of the anti-push rod is covered with a rubber sleeve, which is characterized in that: the rubber sleeve has an inner cavity Equal-wall-thick elastic body, and any point on the elastic body is recessed toward the inner cavity to form a tubular structure with double-layer side walls. The inner cavity is filled with lubricating liquid, and the reverse push rod and the inner side wall of the rubber sleeve Tight fit, the outer side wall of the rubber sleeve is tightly fitted with the through hole. The invention provides a wax type thermostat with good sealing performance and fast response.

Description

technical field [0001] The invention relates to the technical field of automobile engine cooling systems, in particular to a wax type thermostat. Background technique [0002] The thermostat automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water, and changes the water circulation range to adjust the heat dissipation capacity of the cooling system to ensure that the engine works within a suitable temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal operation of the engine. [0003] At present, the commonly used thermostat is a wax-type thermostat. When the temperature of the coolant is lower than the specified value, the paraffin wax in the temperature sensing body of the thermostat is solid, and the thermostat valve closes the gap between the engine and the radiator under the action of a spring. The coolant returns to the engine through the water p...

AI Technical Summary

Problems solved by technology

However, the above-mentioned liquefied paraffin is in a certain state of high temperature and high pressure, so this has high requirements for the dimensional accuracy of rubber seals.

However, better sealing will inevitably lead to greater sliding friction during the sliding process of the reverse push rod, resulting in a delay in the response of the thermostat.

Therefore, there is often a contradiction between good sealing and fast response, so in the prior art, a certain balance can only be taken between the sealing and the response time, and this is precisely what restricts the thermostat of the prior art. developmental problems

[0005] In addition, because the heating process of the paraffin in the temperature sensing body is conducted from the outside to the inside, the outer layer of paraffin often melts before the inner layer of paraffin, while the reverse push rod is bonded with the inner layer of paraffin, so only when the inner layer of paraffin wax The reverse push rod can only work when it is completely melted, and this process causes a delay in the response time, and the response time of the main valve of the thermostat is an important factor that determines the good work of the thermostat

That is, if the main valve of the thermostat is opened too late, the engine will overheat; if the main valve is opened too early, the engine warm-up time will be prolonged and the engine temperature will be too low.

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