RU12185U1 - THERMOSTAT - Google Patents

Abstract

for a utility model Thermostat authors: Tolochko EA, Kostina NN Kurban V.D., Kostikova V.I., Sergeeva L.I., Matyukhina A.I.

The field model relates to instruments for measuring and controlling the temperature of a moving liquid medium, and in particular to thermostats of an automobile engine cooling system.

The goal is to increase the accuracy of measuring and controlling the temperature of a moving fluid and to reduce leakage.

Establish the necessary leakage by changing the gap between the bypass valve and the seat, as well as changing the spring preload force with interchangeable washers.

ESSAY

Description

The utility model relates to instruments for measuring and controlling the temperature of a moving liquid medium, and specifically to thermostats of a cooling system for automobile engines.

Known thermostat (Car VAZ-21.08, authors Vershigora V.A., Ignatov A.P. and others, Moscow, DOSAAF, 1986, p. 62, Fig. 31). The thermostat consists of housing and covers, sealed together with the main valve seat. It has chilled fluid inlet pipes from the radiator, fluid bypass from the radiator, fluid bypass from the engine to the thermostat, and coolant supply. The main valve is pressed into a glass in which a rubber insert is rolled. In the rubber insert there is a polished steel piston mounted on a fixed holder. Between the walls of the glass and the rubber insert there is a thermosensitive solid filler (thermal wax). The main valve is spring-loaded against the seat. Two racks are fixed on the main valve, on which a bypass valve, spring-loaded, is installed. The thermostat, depending on the temperature of the coolant, automatically turns on or off the radiator of the cooling system, passing fluid through the radiator or bypassing it. Increased demands are made on leaks through the main and bypass valves. Leakage is strictly regulated. The less leakage, the more optimal the engine operating mode, the

THERMOSTAT

the engine warms up faster at the beginning of its operation and cools faster when it overheats.

If the leakage through the main valve mainly depends on the quality and relative position of the mating surfaces of the seat and valve, then the leakage through the bypass valve largely depends on the clearance between the bypass valve and the seat. A significant drawback of the thermostat is the dependence of the gap on the accuracy of manufacturing of mating parts, which affects the pressure of the bypass valve. The greater the pressing force, the less leakage and vice versa.

The technical task of the utility model is to increase the accuracy of measuring and regulating the temperature of the fluid, the liquid medium and reducing leakage.

The technical result of the utility model is achieved by establishing the necessary leakage by changing the gap between the bypass valve and the seat, as well as changing the spring preload force with interchangeable washers.

The drawing shows the construction of a utility model of the thermostat.

The thermostat consists of a housing 1 and a cover 2, interconnected by screws. In the lid 2, with the help of the support 3, a thermocouple is fixed, which includes a thermopower sensor 4 with a rod 5 abutting against the socket of the lid. On the sensor 4, as a heat-sensitive element in which a thermal wax is used, the main valve b is pressed in, pressed against the seat saddle 7 by the spring 8. On the sensor 4, a bypass valve 9 is installed, pressed by the spring 10 to the lock washer 11.

Between the bypass valve E and the lock washer 11, interchangeable washers 12 are located to install the necessary

the gap A between the bypass valve 9 and the seat 13 of the housing 1, as well as the efforts of preloading the spring of the bypass valve to reduce leakage. Using the number of washers, the smallest leak is achieved.

The thermostat operates as follows.

On a cold engine, at a temperature of cooling, it has liquids below 85 ° C, the main thermostat valve is open, and the bypass valve is open. Coolant circulates from the engine through the bypass valve, the pump and is again fed to the engine (small circulation circle), bypassing the radiator. This ensures a quick warm-up of the engine.

If the temperature of the liquid is higher than 1, the thermal wax in the sensor melts, increasing in volume, and pushes the sensor rod. The main valve starts to open and the bypass closes.

After completing stroke A, the bypass valve blocks the fluid movement in a small circle and the liquid is supplied from the engine through the radiator to the thermostat, and then through the main valve to the pump and into the engine (large circulation circle).

When leaking through the bypass valve more than the permissible value, the number of interchangeable washers is changed, in order to reduce leakage.

The thermostat for the engine cooling system is produced by the Orel CJSC ORLEX. The technical and economic effect of using the utility model in comparison with the prototype will be obtained by increasing the life of the car engine and simplifying the manufacturing technology of parts and components of the thermostat.

Claims (1)

The thermostat has a body and cover rigidly interconnected, inside of which there is a spring-loaded between the main valve abutting against the seat of the cover, and a cover support thermosensor, abutting against the top of the movable rod into the socket of the cover and having a spring-loaded between the lock washer and the case of the thermal power sensor bypass a valve, the stroke of which is limited by the housing seat, characterized in that interchangeable washers are installed between the bypass valve and the lock washer, allowing the leakage to be regulated through the vent valve.