KR20040096673A - Thermostat mounting apparatus - Google Patents

Abstract

PURPOSE: Control structure for opening and closing a thermostat valve is provided to prevent supercooling of an engine and operation of a thermostat valve against flow pressure fluctuation of coolant by opening and closing the thermostat valve according to temperature change of coolant with a piston. CONSTITUTION: A thermostat(20) is installed in a thermostat housing(30), and composed of a case, a valve(22) regulating flow of water in the case, a pallet(23) and a spring operating the valve according to temperature change of coolant. A pressure water channel(32) is formed in the middle of the thermostat housing to guide part of coolant flowing into the thermostat housing to the lower part of the valve. A piston(34) is contained in the end of the pressure water channel to support the lower part of the valve. The lower part of the pressure water channel is bent perpendicularly, and the lower part of the piston is elastically supported.

Description

Opening and closing control structure of the thermostat valve {Thermostat mounting apparatus}

The present invention relates to an opening and closing control structure of the thermostat valve, and more particularly, to prevent the thermostat valve from being operated by the change in the flow pressure of the coolant, and the thermostat valve can be opened and closed only by the temperature change of the coolant. The opening and closing control structure of the thermostat valve to make it possible.

In general, a cooling device for preventing overheating of the engine due to combustion heat is applied to an engine for driving a vehicle, and a water-cooled cooling device is applied to most vehicle engines. As is well known, a water-cooled chiller includes a water jacket formed around a combustion chamber provided in a cylinder block and a cylinder head, a water pump for pumping water into the water jacket, and a radiator for cooling the heated water while passing through the water jacket. And the like.

Therefore, when the engine is driven, the cooling water is not circulated until the engine is warmed up at the beginning of engine start. The water pump is operated after the engine is heated above a proper temperature, and the cooling water is forcibly supplied to the water jacket. The coolant heated by the engine heat while passing through the water jacket is radiated to the atmosphere while passing through the radiator, cooled, and then supplied to the water jacket again by pumping the water pump.

On the other hand, in the circulating process of the coolant as described above, a thermostat for controlling the circulation direction and the circulation amount of the coolant is formed in the middle of the coolant.

4 is a cross-sectional view of a general thermostat applied to a cooling system of an engine, wherein the thermostat 10 is formed with a case 11 to be seated in the middle of a cooling water passage, and the inside of the case 11 is formed of a coolant. A valve 12 is formed for opening and closing the flow. In addition, a pellet 13, which is a means for controlling the passage of the coolant through which the coolant passes by opening the valve 12 as the coolant temperature rises, is formed at one side of the valve 12. The inside of the pellet 13 is filled with a wax (14) and rubber 15, the volume of which changes in accordance with the change in the ambient temperature, the spindle is moved in accordance with the volume change of the wax (14) and rubber (15) One end of the 16 is fixed to the case 11. When the cooling water temperature is lower than a predetermined level, a spring 17 for maintaining the closed state of the valve 12 is installed while the valve 12 is elastically supported.

That is, when the coolant temperature of the coolant to which the thermostat 10 is mounted increases, the volume of the wax 14 filled in the pellet 13 expands and the spindle 16 moves to move the valve 12. When the cooling water passes through the cooling water passage and the cooling water temperature is lower than the set temperature, the valve 12 is kept closed by the elastic force of the spring 17.

However, although the thermostat is configured to operate only by the temperature change of the coolant, when the elastic force of the spring supporting the valve becomes weaker than the flow pressure of the coolant, the valve of the thermostat opens and the engine is opened. There was a problem that the phenomenon of overcooling occurs, the performance of the engine is lowered and the heating performance of the vehicle is lowered.

Therefore, the present invention has been made to solve the above problems, not only to prevent the thermostat valve is operated by the change in the flow pressure of the coolant, so that the thermostat valve can be opened and closed only by the temperature change of the coolant. It relates to an opening and closing control structure of the thermostat valve.

The present invention as a means for achieving the above object,

A thermostat comprising a case, a valve for controlling the flow of water inside the case, a pellet and a spring for operating the valve according to a temperature change of the engine coolant, is provided in the thermostat housing provided in the middle of the coolant. In the structure to be mounted,

A pressurized water passage for guiding a portion of the coolant flowing into the thermostat housing is formed in the middle of the thermostat housing, and a piston for supporting the lower side of the valve is provided at the end of the pressurized water passage. It is characterized in that it is accommodated.

1 is a block diagram of a state in which the thermostat is mounted by the present invention.

Figure 2 is an operating state of the thermostat mounted by the present invention.

Figure 3 is a mounting configuration of the thermostat formed by another embodiment of the present invention.

4 is a diagram for explaining a conventional technology.

※ Explanation of code for main part of drawing

20: thermostat 21: case

22: valve 23: pellet

24: spindle 25: spring

30: thermostat housing 32: pressurized water

32a: cooling water inlet 34: piston

36: subspring

Hereinafter, a preferred embodiment according to the configuration and operation of the thermostat according to the present invention will be described in detail with the accompanying drawings.

1 is a configuration diagram of a state in which the thermostat is mounted by the present invention, Figure 2 is an operating state diagram of the thermostat mounted by the present invention, Figure 3 is a mounting of the thermostat formed by another embodiment of the present invention It is a block diagram.

Reference numeral 30 indicated in the drawings indicates a thermostat housing according to the present invention, and reference numeral 20 denotes a thermostat.

The thermostat 20 is formed with a case 21 for mounting on the thermostat housing 30, as in the conventional general thermostat, and for opening and closing a passage through which the coolant passes through the case 21. The valve 22 is formed. In addition, the valve 22 is configured such that the spindle 24 is pushed back and forth according to the deformation of the wax and rubber contained in the pellet 23.

And in the middle of the thermostat housing 30 to which the thermostat 20 is mounted, a pressurized water passage for allowing the flow pressure of the cooling water to affect the direction in which the valve 22 of the thermostat 20 is closed ( 32) is formed. By the way, the thermostat 20 is a flow direction of the coolant may flow from the front to the rear, or from the rear to the front, depending on the mounting position, in view of this point in the present invention, the coolant from the upper direction to the lower direction in the drawings It will be described mainly with the flowing.

1 and 2, the mounting state of the thermostat shown in the case where the flow direction of the coolant flows from the upper side to the lower side (for example, when mounted in the middle of the cooling water path connecting the radiator and the water pump), The thermostat shown in Fig. 3 is a case where the flow of the cooling water flows from the lower side to the upper side in the drawing (for example, when it is mounted in the middle of the cooling water passage connecting the engine and the radiator).

That is, in the case of FIGS. 1 and 2, the coolant inlet 32a of the pressurized water path 32 may be transferred to a pressure opposite to the main flow direction of the coolant so that the pressure of the coolant induced in the pressurized water path 32 may be transmitted. ) Is formed on the upper side of the valve 22, and in the case of FIG. 3, the pressurized water path so that the pressure of the coolant induced in the pressurized water path 32 can be transmitted in the same direction as the main flow direction of the coolant. 32, the coolant inlet 32a is formed at the lower side of the valve 22. As shown in FIG.

In both cases, the end of the pressurized water passage 32 is formed to face the lower side of the valve 22 in a state where a predetermined interval is maintained, and the piston 34 supporting the lower side of the valve 22. ) Is mounted at the end of the pressurized water channel 32. In addition, the piston 34 is elastically supported by the sub-spring 36.

On the other hand, the valve 22 and the piston 34 is preferably connected by a rod 35 having a smaller cross-sectional area than the piston 34.

Referring to the operation of the thermostat attached to the thermostat housing configured as described above are as follows.

The thermostat 20 is operated to meet the original purpose configured to operate only by the temperature change of the coolant, when the temperature of the coolant rises above a certain temperature, the wax and rubber material inside the pellet 23 is expanded The spindle 24 is moved. Therefore, the valve 22 moves downward in the drawing to open a passage through which the coolant passes, thereby allowing the flow of the coolant. That is, when the thermostat is installed in the coolant passage between the engine and the radiator, the coolant heated to a predetermined temperature or more in the engine is opened to the radiator side because the valve 22 of the thermostat is opened.

Of course, since the temperature of the coolant is low until the warm-up is performed after the engine is started, the valve 22 of the thermostat 20 is closed and the flow of the coolant is not made. By the way, as mentioned in the description of the prior art, even if the temperature of the coolant is below the set temperature, the above-described valve ( 22) is opened, the engine is overcooled.

However, in the case of the thermostat 20 mounted in accordance with the present invention, the valve 22 is supported in the closing direction by the piston 34 that conforms to the flow pressure of the cooling water on the lower side of the valve 22. The phenomenon in which the valve 22 is easily opened to the flow pressure of is prevented. In particular, as shown in Figures 1 to 2 when the flow of the cooling water flows from the top to the bottom of the thermostat 20 in the drawing is that the effect is much greater.

In the present invention configured as described above, the valve of the thermostat is supported in the closing direction by a piston operated in response to the flow of the coolant, so that the temperature of the coolant circulating the engine is lower than or equal to the set temperature at which the thermostat valve is opened. The valve is opened by the flow pressure of the coolant, thereby preventing the engine from being overcooled.

Claims (4)

A thermostat comprising a case, a valve for controlling the flow of water inside the case, a pellet and a spring for operating the valve according to a temperature change of the engine coolant, is provided in the thermostat housing provided in the middle of the coolant. In the structure to be mounted, A pressurized water passage 32 is formed in the middle of the thermostat housing 30 for guiding a part of the coolant flowing into the thermostat housing 30 to the lower outer periphery of the valve 22. Opening and closing control structure of the thermostat valve, characterized in that a piston (34) for supporting the lower side of the valve (22) is accommodated at the end of the (32). The method of claim 1, Opening and closing of the thermostat valve, characterized in that the lower portion of the pressurized water channel 32 in which the piston 34 is accommodated is bent at right angles, and the lower portion of the piston 34 is elastically supported by the sub spring 36. Control structure. The method of claim 1, The hydraulic pressure of the cooling water introduced into the pressurized water passage 32 in the direction opposite to the original cooling water flow direction to the pressurized water passage 32 acts to transfer the lower side of the valve 22. Opening and controlling structure of the thermostat valve, characterized in that the coolant inlet (32a) is formed in the upper thermostat housing (30). The method of claim 1, The pressurized water passage 32 has a lower side of the valve 22 such that the water pressure of the cooling water introduced into the pressurized water passage 32 acts in the same direction as the original cooling water flow direction to be delivered to one side of the valve 22. Cooling water inlet (32a) is formed in the opening and closing control structure of the thermostat valve.