JPH057929U - Cooling water pressure controller - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the production cost of a cooling water pressure control device and improve its reliability. A cooling water pressure adjusting device is provided with a pressure adjusting valve 11 attached to an upper tank 2 of a radiator.
The pressure control valve 11 includes a valve body 14 and a cylinder mechanism 15 for positioning the valve body 14 in a closed position by the pressure of engine oil.
Then, a bending force is generated at a predetermined temperature, and in the case of bending, the bimetal plate 16 for positioning the valve body 14 at the open position is provided. The engine 9 stops, the pressure of the engine oil acting on the cylinder mechanism 15 disappears,
Moreover, when the temperature inside the valve mounting portion 3 becomes higher than a predetermined temperature, the bimetal plate 16 can bend. As a result, the pressure inside the upper tank 2 is reduced, and the boiling point of the cooling water is lowered. Therefore, the temperature of the cooling water is lowered and the temperature in the engine room is lowered.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling water pressure control device that reduces pressure in a cooling path when an engine is stopped and the temperature of cooling water is higher than a predetermined temperature.

[0002]

[Prior Art]

 The pressure in the cooling path of the vehicle engine is set to be higher than atmospheric pressure. As a result, the boiling point of the cooling water rises, the temperature difference from the outside air can be increased, and the cooling efficiency in the radiator is improved. However, by raising the boiling point of the cooling water, the temperature inside the engine room rises, and so-called heat damage such as deterioration of the restartability of the engine becomes noticeable, and countermeasures against it are necessary. Therefore, it is known to attach a cooling water pressure control device to the cooling path of the engine.

In the conventional cooling water pressure control device, the radiator and the condensation tank are directly communicated with each other by a bypass passage, and an electromagnetic opening / closing valve is provided in the middle of the bypass passage. The electromagnetic on-off valve is opened and closed by a controller equipped with a microcomputer. A temperature sensor attached to the cooling path, an ignition switch, etc. are electrically connected to the controller. Based on the signals supplied from these, the controller opens the electromagnetic opening / closing valve to reduce the pressure in the cooling path when the vehicle is parked and the cooling water is higher than the predetermined temperature. Lower the boiling point of the cooling water that was set on the high temperature side. Along with this, the temperature of the cooling water can be lowered, and so-called heat damage in the engine room can be prevented.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional cooling water pressure control device, it is necessary to provide a controller and a sensor, which increases the production cost. Further, since the controller electrically operates the solenoid on-off valve, there is a problem such as poor reliability. The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to provide a cooling water pressure control device that can reduce production costs and is highly reliable.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a valve opening provided in a cooling path of an engine for allowing cooling water to escape to a low pressure side and a valve opening and closing the valve opening by contacting with and separating from the valve opening. A valve closing mechanism that mechanically positions the valve body to the closed position by applying a fluid pressure that is applied to the valve body and the valve body in one direction, and the fluid pressure drops when the engine stops. In addition, it has a bimetal that can be deformed when the temperature of the cooling water is higher than a prescribed temperature. And a valve mechanism.

[0006]

[Action]

 The cylinder mechanism mechanically positions the valve element in the closed position by using the pressure of engine oil, for example. Therefore, when the engine is driven, the valve closing mechanism positions the valve element in the closed position and holds the pressure of the cooling water. Thereby, the boiling point of the cooling water can be set high.

Further, when the engine is stopped and the temperature of the cooling water is higher than a predetermined temperature, the valve opening mechanism mechanically positions the valve element in the open position. Therefore, the cooling water escapes to the low pressure side from the valve port, and the cooling water is depressurized. This lowers the boiling point of the cooling water and lowers the temperature of the cooling water.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a cooling water pressure control device to which the present invention is applied. The cooling water pressure control device comprises a pressure adjusting valve 11, which is used for cooling a vehicle engine 9. It is attached to the valve mounting portion 3 of the upper tank 2 of the radiator 1 that radiates water.

As shown in FIG. 2, the valve mounting portion 3 of the upper tank 2 is composed of a cylindrical peripheral wall 3 a extending upward from the upper surface of the upper tank 2 and an upper plate 3 b closing the upper side of the peripheral wall 3 a. These are integrally molded. A large-diameter hole 3c serving as a valve opening is formed at a central position of the upper plate 3b. A seal member 4 is fixed to the lower surface of the upper plate 3b so as to surround the large diameter hole 3c.

A radiator cap 5 is attached to the upper tank 2 of the radiator 1 (FIG. 1). The radiator cap 5 can keep the inside of the upper tank 2 at a high pressure, and raises the boiling point of the cooling water to, for example, 120 ° C. A tube 6 through which the overflowed cooling water flows extends from the radiator cap 5, and the tip of the tube 6 is inserted into the condensation tank 7.

As shown in FIG. 2, the pressure control valve 11 is composed of a case 13, a valve body 14, a cylinder mechanism 15, a bimetal plate 16, and the like. The case 13 is composed of a cylindrical peripheral wall 13a and a top plate 13b that closes the upper side of the peripheral wall 13a, and these are integrally molded. The lower edge of the peripheral wall 13a is fixed to the upper surface of the upper plate 3b so as to surround the large diameter hole 3c. A port 18 is provided on one side of the peripheral wall 13a, and a hole 13c is provided on the other side. One end of a tube 19 (FIG. 1) is connected to the port 18. The other end of the tube 19 is connected in the middle of the tube 6. Therefore, this port 18 communicates with the inside of the condensation tank 7 via the tubes 19 and 6. On the other hand, a port 20 is provided at the center of the top plate 13b.

The valve body 14 has, for example, a disc shape with a hole formed in the center. The valve body 14 is arranged below the seal member 4, and is fitted and fixed at a position near the tip of an operation rod 15c of a cylinder mechanism 15 described later. In the closed position shown in FIG. 2, the valve body 14 airtightly closes the large diameter hole 3c, and in the open position shown in FIG. 3, the cooling water and the vapor are removed through the large diameter hole 3c. Allow distribution.

The cylinder mechanism 15 is housed in the case 13. The cylinder barrel 15a of the cylinder mechanism 15 is fixed to the top plate 13b of the case 13. The cylinder barrel 15a is divided into pressure chambers 22 and 23 by a piston 15b. The upper pressure chamber 22 is open to the atmosphere via the port 20. The lower pressure chamber 23 communicates with, for example, the cylinder head of the engine 9 via the oil passage 25, and can guide the engine oil pressurized when the engine 9 is driven.

On the other hand, the operating rod 15c of the cylinder mechanism 15 extends downward and enters the valve mounting portion 3 through the large diameter hole 3c. The valve element 14 is attached to the operating rod 15c as described above. Therefore, the actuating rod 15c positions the valve body 14 in the closed position by retracting, and positions the valve body 14 in the open position by extending. The operating rod 15c receives the force of the engine oil flowing into the pressure chamber 23 in the direction of contracting through the piston 15b.

The bimetal plate 16 is, for example, an invar (Ni—Fe alloy) low expansion alloy to which bronze is bonded. The bimetal plate 16 is formed in, for example, a substantially rectangular shape and is housed in the valve mounting portion 3. The bimetal plate 16 is arranged so as to bridge one side and the other side of the peripheral wall 3a, and both ends thereof are fixed to the inner peripheral surface of the peripheral wall 3a. Therefore, the cooling water and the vapor can flow on both sides of the bimetal plate 16.

At the center of the bimetal plate 16, the tip of the operating rod 15c is fixed. Therefore, the bimetal plate 16 in the state shown in FIG. 2 prevents extension of the operating rod 15c. Further, as shown in FIG. 3, when the bimetal plate 16 is curved, the operating rod 15c is extended to position the valve body 14 at the open position. When the temperature inside the valve mounting portion 3 reaches a predetermined temperature T ° C., a bending force is generated in the bimetal plate 16 so as to be convex downward. When the bimetal plate 16 is bent and the inside of the valve mounting portion 3 is depressurized, the boiling point of the cooling water becomes, for example, 105 ° C.

Further, a spring 26 is arranged below the bimetal plate 16. The spring 26 is held by a bracket 27 and presses the bimetal plate 16 in a direction to prevent the bimetal plate 16 from bending. Therefore, even when the temperature in the valve mounting portion 3 reaches the temperature T ° C., when the engine oil is flowing into the pressure chamber 23 of the cylinder mechanism 15, the spring 26 cooperates with the cylinder mechanism 15. , To prevent the bimetal plate 16 from bending.

The bracket 27 extends upward while avoiding interference with the bimetal plate 16 and is fixed to the upper plate 3b of the valve mounting portion 3. Further, the tip of the operating rod 15c may be abutted on the bimetal plate 16 without being fixed thereto. Next, the operation of the cooling water pressure control device provided with the pressure adjusting valve 11 will be described. When the engine 9 is in the operating state and the cooling water, that is, the temperature in the valve mounting portion 3 is lower than the temperature T ° C., the operating rod 15c of the cylinder mechanism 15 retracts and the bimetal plate 16 bends. Since no force is being generated, the valve body 14 is positioned in the closed position (Fig. 2). Therefore, the cooling water and the vapor in the upper tank 2 circulate to the core (not shown) of the radiator 1 and the pressure in the upper tank 2 is maintained. At this time, the radiator cap 5 sets the boiling point of the cooling water to 120 ° C.

From this state, when the temperature of the cooling water rises and reaches the temperature T ° C., a bending force is generated in the bimetal plate 16. However, in this state, as described above, the cylinder mechanism 15 and the spring 26 prevent the bimetal plate 16 from bending. Therefore, the valve body 14 is held in the closed position, the cooling water in the upper tank 2 circulates to the core, and the pressure in the upper tank 2 is maintained. Therefore, the temperature of the cooling water can rise to about 120 ° C.

Further, from this state, when the engine 9 is stopped, the engine oil is drained from the pressure chamber 23 of the cylinder mechanism 15. Therefore, the bimetal plate 16 bends against the pressing force of the spring 26, and at the same time, the operating rod 15c extends. Accordingly, the valve body 14 is positioned in the open position (Fig. 3). As a result, the cooling water or vapor in the upper tank 2 flows out of the port 18 through the large diameter hole 3c of the valve mounting portion 3, flows through the tubes 19 and 6, and is stored in the condensation tank 7.

The cooling water and the vapor flow out from the upper tank 2 to reduce the pressure in the upper tank 2. Therefore, the boiling point of the cooling water is lowered from 120 ° C to 105 ° C, and the temperature of the cooling water is lowered accordingly, so that the temperature in the engine room is lowered. Then, when the temperature of the cooling water becomes sufficiently low, the curved bimetal plate 16 loses its bending force. Therefore, the shape of the bimetal plate 16 returns, and the pressing force of the spring 26 causes the actuating rod 15c to retract and the valve body 14 to be positioned at the closed position. Thereby, the pressure in the upper tank 2 is maintained.

As described above, when the engine 9 is stopped and the temperature of the cooling water is high, the pressure regulating valve 11 allows the cooling water and the vapor to escape to the condensation tank 7 to reduce the pressure in the upper tank 2. Therefore, the controller and various sensors required for the conventional cooling water pressure adjusting device can be omitted. Although the spring 26 is arranged below the bimetal plate 16 in this embodiment, the present invention is not limited to this, and the pressure chamber of the cylinder mechanism 32 such as the pressure adjusting valve 30 shown in FIG. It is also possible to provide the spring 31 in 33. In this case, a spring may be provided below the bimetal plate 16 or may be omitted.

Further, the cylinder mechanism of the pressure regulating valve may be configured to include a so-called bellows type piston like the cylinder mechanism 36 of the pressure regulating valve 35 shown in FIG. Further, in this embodiment, the pressure adjusting valve 11 is attached to the upper tank 2 of the radiator 1, but the attaching position of the pressure adjusting valve 11 is not limited to this position.

[0024]

[Effect of the device]

 As described above, according to the present invention, since the cooling water pressure control device is configured as described above, it is possible to reduce production costs and further improve reliability. is there.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a radiator around a cooling path to which a cooling water pressure control device according to the present invention is applied.

FIG. 2 is a cross-sectional view showing details of the pressure regulating valve in FIG. 1 in a valve closed state.

FIG. 3 is a cross-sectional view showing the details of the pressure regulating valve of FIG. 1 and in a valve open state.

FIG. 4 is a sectional view showing another embodiment of FIG.

FIG. 5 is a sectional view showing another embodiment of the cylinder mechanism of FIG.

[Explanation of symbols]

 1 Radiator 3 Valve mounting part 9 Vehicle engine 11,30,35 Pressure regulating valve 14 Valve body 15,32,36 Cylinder mechanism 16 Bimetal plate

Claims (1)

[Claims for utility model registration] [Claim 1] A valve opening provided in a cooling path of an engine for releasing cooling water to a low pressure side
A valve body that opens and closes the valve port, a valve closing mechanism that mechanically positions the valve body at a closed position by causing a fluid pressure that is pressurized with the driving of the engine to act in one direction on the valve body. It has a bimetal that can be deformed when it stops and the fluid pressure decreases and the temperature of the cooling water is higher than a predetermined temperature.The deformation of this bimetal is used to urge the valve element in the other direction and mechanically And a valve opening mechanism for locating the valve in the open position.