KR100587804B1 - Thermostat - Google Patents

Abstract

The present invention relates to a thermostat structure employing a rotary valve, and in particular, fixing the first and second fixing plates each having a through hole formed to have a phase difference to intersect the bypass side and the radiator side on the cooling water circulation line of the cylinder head. And a rotary valve closely attached to each fixed plate to selectively open the passage hole of the fixed plate, and connecting the rotary valve with a temperature sensing driving means for rotating and opening and closing the rotary valve according to the coolant temperature. Formed on the rotating shaft, the rotary valve rotates at an angle depending on the coolant temperature and selectively opens the bypass side or the radiator side, and the position of the temperature sensing drive means is fixed so that the coolant temperature can be detected more stably. The valve of the thermostat is abnormal by water pressure The present invention relates to a thermostat structure employing a rotary valve that can be disabled to improve the reliability of the thermostat's operating performance.

Thermostat, Rotary Valve, Wax, Torsion Spring

Description

Thermostat structure with rotary valve {Thermostat}

1 is a view showing a thermostat structure employing a rotary valve of the present invention.

Figure 2 (a) ~ (c) is a view showing the shape of the fixed plate and the rotary valve applied to the present invention and the operating state of the rotary valve.

Figure 3 is a cross-sectional view showing a temperature sensing drive means applied to the present invention.

4 is a view showing a conventional thermostat structure.

5 is a diagram for explaining a conventional problem.

※ Explanation of code for main part of drawing

1,3: fixing plate 2,4: through hole

5: Rotation guide 6,8: Rotating valve

7,9: valve hole 10: rotating shaft

11: circulation pipe 12: temperature sensing drive means

13: housing 14: wax

15: connecting rod 16: expansion passage

17: stopper 18: torsion spring

The present invention relates to a thermostat structure employing a rotary valve, and in particular, the rotary valve rotates at an angle depending on the coolant temperature to selectively open the bypass side or the radiator side, and the position of the temperature sensing drive means is fixed. The rotary valve can be opened and closed by detecting the coolant temperature more stably, and the thermo valve adopts a rotary valve to improve the reliability of the thermostat's operation performance because the valve of the thermostat does not operate abnormally by water pressure. It is about the stat structure.

After starting the engine, it is necessary to raise the cooling water to a proper temperature (around 80 ° C) quickly, and to prevent overcooling on a long downhill road, as shown in FIG. 4 in the middle of the cooling water circulation pipeline. Is installing.

Thermostat 20 is a valve that operates automatically in accordance with the coolant temperature is installed in the radiator side channel of the cylinder head.

Accordingly, when the temperature of the coolant is low, the valve 21 is closed and the valve plate 25 on the bypass side is opened so that the coolant circulated inside the engine is supplied back to the water pump to circulate the engine so that the water temperature in the water jacket is circulated. When the temperature of the cooling water rises above the proper temperature (70 to 80 ° C), the valve 21 opens gradually, and the cooling water flows from the radiator side, and the cooling water of low temperature is supplied into the engine through the water pump to effectively operate the engine. It will be able to cool.

The thermostat 20 is a wax pellet type that uses the wax 22 to be expanded and contracted by heat by sealing the wax 22 in the pellet 23 so that the valve 21 is automatically opened and closed by water temperature. Generally used a lot.

However, according to the thermostat 20 of the conventional structure as shown, since the valve 21 is opened and closed by the linear movement of the spindle 24 according to the expansion of the wax 22 which senses the temperature, the valve 21 is opened. The degree depends on the lift amount of the spindle 24, but there is a limit to the increase and decrease of the flow path area, which causes a problem that the flow resistance occupies the entire cooling system is large.

In addition, when the temperature of the coolant rises to about 80 ° C or more after the engine warm-up period, the wax of the thermostat expands and the bypass side is closed, and the radiator side is opened. At this time, the high temperature bypassed coolant receives the wax portion of the thermostat. If it does not flow enough, there is a problem that the valve opening and closing accuracy of the thermostat according to the cooling water temperature is lowered.

That is, as shown in FIG. 5, the valve plate interferes with the high temperature coolant flow supplied from the bypass side and collides with the coolant coming from the radiator side so that the coolant does not extend far into the thermostat housing and is bent toward the water pump. Passed cooling water does not flow sufficiently into the wax part of the thermostat, which lowers the temperature sensitivity. There is a problem that the overall engine cooling performance is reduced while abnormal operation occurs such that the side is opened again without being completely closed.

In addition, when the number of rotations of the water thermostat of the conventional thermostat increases, the pressure of the A portion of the thermostat housing is lowered so that the valve of the radiator is opened even though the engine is not sufficiently warmed up.

Accordingly, the present invention for solving the above problems is fixed to the first and second fixed plates each having a through hole formed so as to have a phase difference so as to intersect the bypass side and the radiator side on the cooling water circulation passage of the cylinder head, the fixed plate By forming the rotary valve in close contact with each of the fixed plate to selectively open the through hole of the, and by forming a temperature sensing drive means for rotating and opening the rotary valve in accordance with the coolant temperature on the rotary shaft interconnecting the rotary valve, Depending on the coolant temperature, the rotary valve rotates at an angle and selectively opens the bypass side or the radiator side, and the position of the temperature sensing driving means is fixed so that the cooling valve temperature can be detected more stably to open and close the rotary valve. The valve of the thermostat will not work abnormally And a time thermostat structure employing a selection valve so as to improve the reliability of the operation performance of the thermostat intended to provide.

The present invention for achieving the above object,

In the thermostat installed in the radiator side circulation line of the cylinder head,

A first fixing plate and a second fixing plate are formed to intersect the bypass side and the radiator side of the circulation pipe, and the first plate and the second passage hole having a phase difference of 90 ° are formed in the fixing plate, respectively.

One side surface of the first and second fixing plate is rotatably formed to close the first and second rotary valve formed with the first and second valve holes in the same position,

The first rotary valve and the second rotary valve are connected to each other by a separate rotary shaft,

The first fixed plate is formed with a temperature sensing drive means for rotating the rotating shaft in one direction according to the coolant temperature, the second fixed plate is characterized in that the torsion spring for returning the rotating shaft to its original position.

The temperature sensing driving means is fixedly coupled to one side of the housing fixed in the cylindrical shape to surround the rotating shaft, the first fixing plate,

Forming a wax that contracts or expands in the circumferential direction according to the coolant temperature in the housing,

The end of the wax and the rotating shaft is connected by a separate connecting rod is characterized in that the rotating shaft is configured to rotate in one direction during the expansion of the wax.

And, forming an expansion passage in the circumferential direction on the inner circumferential surface of the housing and configured to expand the wax along the expansion passage, one end of the wax is fixed by a stopper,

The outer side of the first and second fixing plate is characterized in that the rotating guide to be rotated in a state of rotating the valve is fitted in a 'b' shape.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 3.

The thermostat of the present invention is installed on the radiator side circulation pipe 11 of the cylinder head as shown in FIG.

As shown in the figure, the first fixing plate 1 and the second fixing plate 3 are fixedly coupled to the bypass side and the radiator side of the circulation conduit 11, respectively. 1 and 3 are formed with a first through hole 2 and a second through hole 4 each having a phase difference of 90 ° as shown in FIG. 2A, and the first and second fixing plates 1 and 3 respectively. Outside the 3) is formed by rotating the rotary guide (5, 8) to be inserted into the rotating guide (5) to be rotated in the 'b' shape.

One side of the first fixing plate (1) is in close contact with the first rotary valve (6), one side of the second fixing plate (3) to the second rotary valve (8), wherein the first and second rotation The valves 6 and 8 are fitted into the rotation guides 5 formed on the first and second fixing plates 1 and 3 so as to maintain a close contact therewith. 8 is connected to each other as the rotary shaft 10 so that each of the rotary valves 6 and 8 can rotate in the rotational direction of the rotary shaft 10.

In addition, the rotary valves 6 and 8 form a first valve hole 7 and a second valve hole 9 at the same position as shown in FIG. 2 (b). The valve hole 7 communicates with the first passage hole 2, and the second valve hole 9 does not communicate with the second passage hole 4.

On the other hand, the first fixed plate 1 is formed with a temperature sensing drive means 12 for rotating the rotary shaft 10 in one direction according to the temperature of the cooling water,

As shown in FIG. 3, the temperature sensing driving means 12 is fixedly coupled to one side of the first fixing plate 1 in a cylindrical shape 13 so as to surround the rotating shaft 10, and the housing 13. Wax 14 is formed to shrink or expand in the circumferential direction according to the coolant temperature in the interior, and the end of the wax 14 and the rotating shaft 10 by connecting a separate connecting rod 15 to expand the wax 14 When the rotating shaft 10 is configured to rotate in one direction.

An expansion passage 16 is formed in the housing 13 in the circumferential direction to guide the wax 14 to expand in the circumferential direction, and one end of the wax 14 is a separate stopper 17. It is fixed to configure the temperature sensing drive means (12).

In addition, in the present invention, when the wax 14 of the temperature sensing drive means 12 contracts, the torsion spring 18 for returning the rotation shaft 10 to its original position (rotating in the reverse direction) of the second fixing plate 3 is provided. Form on one side.

That is, the torsion spring 18 is formed to surround the rotation shaft 10, one end of the torsion spring 18 is coupled to the rotation shaft 10 and the other side is fixed to the second fixing plate 3 wax ( The torsion spring 18 was allowed to rotate the rotating shaft 10 in the reverse direction when 14) contracted.

Referring to the operation of the present invention configured as described above is as follows.

In the initial state of the thermostat, the first valve hole 7 of the first rotary valve 6 coincides with the first passage hole 2 of the first fixing plate 1 so that the bypass side is opened and the second rotation is performed. The radiator side is blocked while the second valve hole 9 of the valve 8 is inconsistent with the second through hole 4 of the second fixing plate 3.

When the engine is driven in this state, the coolant circulating in the engine is re-supplied to the water pump through the first valve hole 7 and the first through-hole 2 opened to recycle the engine.

Then, when the cooling water temperature rises above the predetermined temperature after a certain time, the wax 14 of the temperature sensing drive means 12 is circumferentially along the expansion passage 16 by the temperature of the cooling water supplied from the bypass side. Direction, and the rotation shaft 10 connected as the connecting table 15 is rotated in one direction by the expansion of the wax 14.

When the rotary shaft 10 rotates in one direction, the first and second rotary valves 6 and 8 rotate in one direction, and as shown in FIG. Inconsistent with the passage hole (2), the second valve hole (9) coincides with the second passage hole (4), the bypass side is cut off, the radiator side is open, the low-temperature cooling water is supplied from the radiator side to the water pump side To cool the inside of the engine.

On the other hand, when the radiator side of the circulation conduit 11 is opened and the low-temperature cooling water is supplied to the water pump side, the wax 14 of the temperature sensing drive means 12 is contracted by the low-temperature cooling water temperature, at which time the torsion spring 18 By rotating the rotary shaft 10 by the elastic force of the first and second rotary valves 6 and 8 to their original positions, the radiator side is cut off again and the bypass side is opened. By repeating according to this it is possible to maintain the temperature of the cooling water circulating in the engine at an appropriate temperature.

According to the present invention as described above, since the wax 14 of the temperature sensing drive means 12 for detecting the temperature of the coolant is statically located on the bypass side, the wax 14 can stably detect the coolant temperature. As the coolant flows through the valve hole and the through hole formed in the rotary valve and the fixed plate, the coolant can be immediately flowed to the wax 14 without being disturbed by the flow, thereby detecting the coolant temperature of the wax 14. The characteristics are improved.

In addition, since the passing hole positions of the fixing plates formed on the radiator side and the bypass side are staggered from each other, the collision of the coolant passing through the passing hole is reduced, which also reduces the coolant temperature sensing characteristic of the wax 14. Act as a cause of improvement.

Further, since the radiator side or the bypass side is selectively opened by the rotary valve, it is possible to prevent the phenomenon in which the rotary valve is artificially operated even if the pressure in the circulation pipe is lowered by the high speed rotation of the water pump.

As described above, in the present invention, the first and second fixed plates each having a through hole formed to have a phase difference are fixedly installed so as to intersect the bypass side and the radiator side on the cooling water circulation path of the cylinder head, and the through hole of the fixed plate. The rotary valve is formed in close contact with each of the fixed plates so as to selectively open, and a temperature sensing driving means for rotating and opening the rotary valve according to the coolant temperature is formed on the rotary shaft interconnecting the rotary valves. Accordingly, the rotary valve rotates at an angle and selectively opens the bypass side or the radiator side, and the position of the temperature sensing driving means is fixed, so that the cooling valve temperature can be more stably opened and closed to open and close the rotary valve. The valve of the stat does not work abnormally It can be expected an effect to provide a once thermostat structure employing a selection valve so as to improve the reliability of the dynamic performance.

Claims (5)

In the thermostat installed in the radiator side circulation line 11 of the cylinder head, A first fixing plate 1 and a second fixing plate 3 are formed to intersect the bypass side and the radiator side of the circulation conduit 11, and each of the fixing plates 1 and 3 has a phase difference of 90 °. Forming a first through hole (2) and a second through hole (4), One side of the first and second fixing plates (1, 3) rotatably rotate the first and second rotary valves (6, 8) formed with the first and second valve holes (7, 9) at the same position. Tightly formed, The first rotary valve 6 and the second rotary valve 8 are connected to each other by a separate rotary shaft 10, The first fixed plate (1) is formed with a temperature sensing drive means for rotating the rotary shaft 10 in one direction according to the coolant temperature, the second fixed plate (3) to return the rotary shaft (10) to its original position Thermostat structure employing a rotary valve, characterized in that to form a torsion spring (18). The method of claim 1, The temperature sensing driving means 12 is fixedly coupled to one side of the housing 13 formed in a cylindrical shape so as to surround the rotating shaft 10, the first fixing plate 1, In the housing 13 to form a wax 14 to shrink or expand in the circumferential direction according to the coolant temperature, The end of the wax 14 and the rotary shaft 10 is connected by a separate connecting rod 15 to adopt a rotary valve, characterized in that the rotating shaft 10 is configured to rotate in one direction when the wax 14 is expanded. One thermostat structure. The method of claim 2, Thermostat structure employing a rotary valve, characterized in that the expansion passage 16 in the circumferential direction formed on the inner circumferential surface of the housing 13 so that the wax 14 can expand along the expansion passage 16. . The method of claim 2, One end of the wax 14 is a thermostat structure employing a rotary valve, characterized in that fixed by the stopper (17). The method of claim 1, In the outer periphery of the first and second fixing plates (1, 3) is characterized in that the rotating guide (5) is formed to be bent in a 'b' shape to rotate in a state where the rotary valves (6, 8) is fitted Thermostat structure which adopted rotary valve to do.

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