Variable-runner thermostat

Abstract

The invention relates to a thermostat of an engine cooling system, in particular to a variable-runner thermostat driven by a motor. The variable-runner thermostat comprises a valve body with an inner cavity. A water inlet communicating with a water jacket water outlet pipe is formed in the right side of the valve body, a first outlet connected with a water pump water supply pipe is formed in the lower portion of the valve body, and a second water outlet connected with a heat radiator water supply pipe is formed in the upper portion of the valve body. A variable-runner baffle is arranged in the inner cavity and connected with the motor through a center shaft. One half side of the variable-runner baffle rotates between the two sides of the first outlet, the other corresponding half side of the variable-runner baffle rotates between the two sides of the second water outlet, and the rotating angles of the variable-runner baffle are controlled by the motor. The variable-runner thermostat is driven by the motor, and when the work condition of an engine changes, the response is fast. Different operating strategies can be adopted according to the change of the work condition of the engine to improve the performance of the engine. Finally, due to the controllable flow area, different circulating cooling water circulating amounts can be precisely controlled, and the cooling system can be better optimized.

Description

technical field [0001] The invention relates to a thermostat of an engine cooling system, in particular to a thermostat driven by an electric motor. Background technique [0002] The flow path of the existing thermostat is rough and varied. When the fluid passes through the thermostat, it experiences several times of zooming, throttling, impact, etc., resulting in a huge pressure drop of the fluid in this section, resulting in a huge power consumption of the water pump, which is not Conducive to saving energy. [0003] In addition, the existing thermostats generally only have one set of operating characteristic curves (temperature-lift relationship curve). The working temperature is low, the initial opening temperature is generally around 80°C, and the full opening temperature is generally around 95°C, and the opening / closing of the thermostat is only controlled by the internal temperature-sensing wax. When the coolant temperature reaches or exceeds the thermostat After th...

AI Technical Summary

Problems solved by technology

Since the action of the existing thermostat is only controlled by the temperature-sensing wax, and the temperature-sensing wax is only controlled by the temperature of the coolant, the thermostat cannot respond quickly when the engine enters sudden acceleration, climbing, etc., and the engine The coolant temperature will fluctuate greatly, which is not conducive to engine life, fuel consumption and emission performance

At the same time, since the existing thermostat cannot respond quickly to the temperature fluctuation of the coolant, in order to ensure that the engine works within a safe range, the operating temperature of the thermostat can only be set lower, leaving enough temperature margin. To ensure that the engine will not overheat, but because the coolant temperature is low, it directly affects the fuel economy of the engine

[0004] Secondly, the opening and closing degree of this thermostat is controlled by the temperature-sensing wax, that is, it is only affected by the temperature of the cooling water, and it cannot make the optimal choice for certain engine conditions.

Not conducive to further optimization of the engine cooling system

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