Automobile engine thermostat and thermoregulation method thereof

Abstract

The invention aims to provide an automobile engine thermostat low in cost, easy to produce and accurate to control, and a thermoregulation method thereof. The automobile engine thermostat comprises a casing. The bottom of the casing is provided with a water inlet. The automobile engine thermostat is characterized in that one end of the casing is provided with an auxiliary water outlet, the other end of the casing, which is opposite to the auxiliary water outlet, is provided with a piston valve capable of moving in the casing, the top of the casing is provided with a small circulation water outlet and a large circulation water outlet sequentially along a movement direction of the piston valve, a valve block of the piston valve is provided with an axial through hole, and the piston valve is connected with an end drive structure of the casing. The automobile engine thermostat is simple in structure and multifunctional, the parts of the automobile engine thermostat can all be machined by common machining methods, machining technical requirements and cost are low, thermoregulation process is achieved by a motor, and precision control can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an automobile engine thermostat and a temperature adjustment method thereof. Background technique [0002] The thermostat commonly used in automobile engines is a thermostat of paraffin structure, which works according to the characteristics of paraffin wax melting and expansion. When the engine water temperature is low, the main valve of the thermostat is closed, the auxiliary valve is opened, and the engine cooling water goes through a small cycle without cooling. When the engine water temperature rises, the paraffin wax melts and expands in the temperature sensing body of the thermostat. During the expansion process, the push rod inside is pushed to move. When the push rod moves, the main valve of the thermostat is driven to open, and the auxiliary valve is closed. The engine cooling water goes through a large circulation to cool the engine, thereby reducing the ...

AI Technical Summary

Problems solved by technology

Although this kind of thermostat breaks away from the paraffin structure thermostat and realizes the motor drive, the sealing when the large and small cycles are closed is completely carried out by the outer diameter of the valve plate, and the thickness of the valve plate is limited, and its sealing effect Poor, it will cause excessive leakage of engine antifreeze when the large and small circulation is closed, which is not conducive to the realization of accurate water temperature control

The valve plate of this kind of thermostat will be impacted by the antifreeze water flow during operation, especially when the valve plate is not completely closed, and under the impact of the large flow of the water pump, the pressure difference between the front and rear of the valve plate will be very large. When it is necessary to require the stepper motor to have a large self-locking ability or output a large reverse torque to prevent the valve from being flushed, and the self-locking ability and output torque of the stepping motor are limited, especially in In the case of limited vehicle power supply energy, it is difficult to ensure that the stepper motor has a large self-locking ability and output torque

In the actual use of the vehicle, the working conditions of the user are constantly changing. In order to achieve accurate control of the water temperature, the opening state of the valve plate also needs to change constantly, and each opening and closing of the valve plate needs to overcome the pressure of the water flow. Impact, its reliability is not easy to guarantee, if in order to realize the precise opening of the valve plate, the motor must output a large rotational force to overcome the impact force from the antifreeze, the motor must be designed larger, which is not conducive to cost Reduced, and the layout is not conducive to achieving compactness and light weight

In addition, in order to reduce the fuel consumption of automobiles, especially at low temperature, the engine can only realize the reduction of fuel consumption by rapid heating. In this way, it is necessary to require the small circulation valve of the thermostat to fully open the small circulation channel, and the large circulation valve can Completely close the large circulation channel and prevent antifreeze leakage. In order to achieve this requirement, a high degree of mutual perpendicularity must be ensured when the two valve pieces are installed on the drive shaft for production, which is not conducive to the realization of mass production, and production high cost

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