JPH0639190Y2 - Temperature-sensitive automatic valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a temperature-sensing automatic valve that operates according to changes in the temperature of a fluid, and in particular to a temperature-sensing automatic valve that controls the cooling water temperature by switching the cooling water circuit of an internal combustion engine. Regarding the valve.

[Conventional technology]

Generally, a temperature-sensing automatic valve (commonly called a thermostat) senses the temperature of a fluid and automatically opens and closes a flow path, and is provided, for example, in a cooling water circuit of an internal combustion engine.

Hereinafter, a cooling water circuit for an internal combustion engine and a conventional example will be described with reference to the drawings.

As shown in FIG. 5 of the drawings, a cooling water circuit 101 for an internal combustion engine
Are water channels 104 and 105 (first channel), 105 '(third channel) connecting between the engine water jacket 102 and the radiator 103, and a bypass channel 106 provided between the water channels 104 and 105, 105'. The temperature-sensing automatic valve B is provided in an intersection 107 where the water channels 105, 105 ′ and the bypass channel 106 intersect each other (second channel).

As shown in FIG. 6, the temperature-sensing automatic valve B has a first valve body 2 on the front end side of an operating body 1 which is operated by a temperature change of a fluid.
And a second valve body 3 on the rear end side of the operating body 1 for urging the first valve body 2 to the closed position and the second valve body 3 to the open position. , A frame 5.

The operating body 1 is composed of a temperature sensing portion 1a and a guide portion 1b, and is a thermal expansion body such as wax that expands and contracts by sensing the temperature of a fluid.
1c is built in the temperature sensing part 1a, and a piston rod 1d is fitted in a guide part 1b extending from the tip of the temperature sensing part 1a.
Further, a pressing body 6 for pressing the tip of the piston rod 1d is provided at the tip of the piston rod 1d.

The first valve body 2 is provided in the guide portion 1b, and the push receiving body 6 serves as the valve seat of the first valve body 2. Further, the pusher body 6 is provided with a mounting portion 6a for projecting to the water channel on the outside.

The second valve body 3 is a valve rod extending from the rear end of the temperature sensing portion 1a.
The second valve body 3 is attached to 3a by a stopper 3b, and the second valve body 3 is spring-biased toward the end of the valve rod 3a by a coil spring interposed between the second valve body 3 and the temperature sensing unit 1. ing.

The urging body 4 is a coil spring, and the first valve body 2 and the frame 5
It is provided so as to be retracted between the first valve body 2 and the first valve body 2 and always biases the first valve body 2 to the closed position.

The temperature-sensing automatic valve B is positioned so that the first valve body 2 opens and closes the water passage 105 and the second valve body 3 opens and closes the bypass water passage 106, and operates as follows.

The thermal expansion body 1c in the temperature sensing portion 1a expands due to the rise of the cooling water temperature and presses the piston rod 1d, so that the actuation body 1 operates against the biasing force of the biasing body 4. As a result, the first valve body 2 moves to the open position to open the water passage 105, and the second valve body 3 moves to the closed position to close the bypass water passage 106. Further, the thermal expansion body 1c contracts due to the decrease in the cooling water temperature, the pressing force of the piston rod 1d weakens, and the urging force of the urging body 4 moves the first valve body 2 to the closed position to close the water channel 105. At the same time, the second valve body 3 is moved to the open position to open the bypass water passage 106. As described above, the temperature-sensing automatic valve mixes and switches the warmed cooling water from the engine water jacket 102 and the cooled cooling water from the radiator 103 in the cooling water circuit 101 of the internal combustion engine to switch the engine water jacket.
The cooling water temperature sent to 102 is controlled to an appropriate temperature.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the first valve body 2 is provided on the front end side of the actuating body 1, and the second valve body 3 is provided on the rear end side of the actuating body 1 to form the water channel.
Since the 105 and the bypass water passage 106 are switched, the water passage 105 ′ for the cooling water sent to the engine water jacket 102 is installed between the first valve body 2 and the second valve body 3,
The main flow of the cooling water flowing from the bypass water passage 106 to the water passage 105 ′ through the intersection 107 directly hits the second valve body 3, and the second valve body becomes a resistance and does not flow to the temperature sensing unit 1 of the operating body 1. Since it directly flows into the water channel 105 ', it is difficult for the temperature sensing unit 1 to sense the temperature change of the cooling water. Therefore, the responsiveness of the operating body 1 was poor, and the cooling water temperature could not be accurately controlled. Moreover, since the bypass water passage 106 circulates the warmed cooling water from the engine water jacket 102, there is a risk that the engine will heat up if the operation of the operating body 1 is delayed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a temperature-sensitive automatic valve having accurate control and good responsiveness.

[Means for solving problems]

The present invention is configured as follows to solve the above problems.

The first flow path, through which the fluid flows out, and the third flow path, through which the fluid flows in, are provided at the intersections of the first flow path and the first flow path. A first valve body that opens and closes the flow passage, a second valve body that is provided on the rear end side of the actuating body and that opens and closes the second flow passage, and urges the first valve body to a closed position. It has an urging body for urging the second valve body to the open position, and a frame provided on the outer periphery of the actuating body, and switches the first flow path or the second flow path by the temperature change of the fluid. In the temperature-sensing automatic valve, a control plate for guiding the flow of the fluid is provided around the temperature sensing unit so as to guide the main flow of the fluid flowing out from the second flow path to the temperature sensing unit of the actuating body. The third flow is provided integrally with the frame, and the outer peripheral surface of the frame is provided so as to block the main flow of the fluid. Characterized in that is opposed to the opening.

[Action]

 The present invention operates as follows with the above configuration.

By providing the control plate, the main flow of the fluid flowing out from the second flow path is guided to the temperature sensing portion of the actuation body, so that the actuation of the actuation body can be improved. In addition, the main flow of the fluid cannot be directly blocked by the control plate and flow into the third flow path, but flows along the inner peripheral surface of the control plate and wraps around the peripheral portion of the control plate, and the third flow path is formed. It flows into the flow path. At this time, the fluid is agitated in the vicinity of the actuation body, and the temperature distribution of the fluid in the vicinity of the actuation body is made uniform.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG.
1 is a sectional view taken along the line II-II 'of FIG. 1, FIG. 3 is a front view showing another embodiment of the present invention, and FIG. 4 is a plan view of FIG.

As shown in FIGS. 1 and 2, the temperature-sensing automatic valve A is provided with a first valve body 2 on the front end side of an operating body 1 which is operated by a temperature change of a fluid, and a rear end of the operating body 1. The second valve body 3 is provided on the side to urge the first valve body 2 to the closed position and
An urging body 4 for urging the valve body 3 to the open position and a frame 5 are provided, and the frame 5 is provided with a control plate 7 for guiding the main flow of the fluid to the temperature sensing portion 1a of the actuating body 1.

The operating body 1 includes a temperature sensing unit 1a and a guide unit 1b. A thermal expansion unit 1c such as wax that expands and contracts by sensing the temperature of a fluid is built in the temperature sensing unit 1a, and a tip of the temperature sensing unit 1a. A piston rod 1d is fitted in a guide portion 1b extending from the. Also, at the tip of the piston rod 1d, the piston rod
A pressing body 6 for pressing the tip of 1d is provided, and this pressing body 6 is a substantially conical shape having a hole portion, and an attachment portion to the water channel on the outside.
6a is protruding.

The first valve body 2 has a substantially circular shape and is provided in the guide portion 1b of the actuating body 1, and the pressing body 6 serves as a valve seat of the first valve body 2.

The second valve body 3 has a substantially circular shape, and is attached to the valve rod 3a extending from the rear end of the temperature sensing portion 1 of the actuating body 1 with a stopper 3b. The second valve body 3 and the temperature sensing portion 1a. The second valve body 3 is spring-biased toward the end of the valve rod 3a by a coil spring interposed between the second valve body 3 and the second valve body 3.

The urging body 4 is a coil spring, and is provided between the first valve body 2 and the frame 5 in a contracted manner so as to wind the operating body 1.
The first valve body 2 is always biased to the closed position.

The frame 5 is two substantially L-shaped plate members and a ring member that connects the plate members. The plate members are positioned so as to face each other so as to sandwich the operating body 1. One end of the plate member is provided in the mounting portion 6a. The other end is provided in a ring body surrounding the temperature sensing unit 1a of the operating body 1.

The control plate 7 has a hollow cylindrical shape and has a diameter larger than that of the second valve body 3, so that the second valve body 3 can be housed from the bent portion of the frame 5 to the rear end side of the operating body. It is provided integrally by being joined to the frame 5.

The temperature-sensing automatic valve A uses the water channels 105, 10 as in the conventional example.
5'is provided in an intersection 107 where the bypass water channel 106 intersects, and the first valve body 2 is positioned to open and close the water channel 105, and the second valve body 3 is positioned to open and close the bypass water channel 106. .
A part of the outer peripheral surface of the control plate 7 is provided so as to face the opening of the water channel 105 ′, so that the main flow of the cooling water flowing out from the bypass water channel 106 cannot directly flow into the water channel 105 ′. There is. That is, the main flow of cooling water flows along the inner peripheral surface of the control plate 7 as shown by the arrows in FIGS. Flow to ′. At this time, cooling water is agitated between the control plate 7 and the temperature sensing unit 1a, and the temperature distribution of the cooling water in this region becomes uniform.

Next, the operation and action of the temperature sensing type automatic valve A will be described.

The thermal expansion body 1c in the temperature sensing portion 1a expands due to the rise of the cooling water temperature and presses the piston rod 1d, so that the actuation body 1 operates against the biasing force of the biasing body 4. As a result, the first valve body 2 moves to the open position to open the water passage 105, and the second valve body 3 moves to the closed position to close the bypass water passage 106. Further, the thermal expansion body 1c contracts due to the decrease in the cooling water temperature, the pressing force of the piston rod 1d weakens, and the urging force of the urging body 4 moves the first valve body 2 to the closed position to close the water channel 105. At the same time, the second valve body 3 is moved to the open position to open the bypass water passage 106.

The cooling water from the bypass water passage 106 is controlled by the control plate 7,
It passes through between the 2nd valve body 3 and the control board 7, is guided to the temperature sensing part 1a of the actuation body 1, penetrates the frame 5 through the circumference of the temperature sensing part 1a, and goes around the periphery of the control plate 7 and a water channel. It will flow to 105 '.

In this embodiment, by providing the control plate 7, the bypass channel
It becomes easier to detect the cooling water temperature from 106, and the responsiveness of the operating body 1 can be improved. In addition, the temperature control of the cooling water sent to the engine water jacket becomes accurate.

Further, since the control plate 7 is simply provided on the frame 5, a method of simply adding the frame 5 can be adopted, and the conventional temperature-sensitive automatic valve can be improved at low cost.

The present invention is not limited to the above embodiment, but may be a semi-hollow cylindrical control plate 7'in which the control plate 7 is divided in half as shown in FIGS. 3 and 4, for example. The control plate may be formed integrally with the frame. The control plate may have a hollow cylindrical shape or a flat plate shape instead of the hollow cylindrical shape or the semi-hollow cylindrical shape.

[Effect of device]

 The present invention has the following effects due to the above configuration.

1) Since the main flow of the fluid is guided to the temperature sensing portion of the operating body by the control plate, the temperature of the fluid can be easily sensed and the responsiveness of the operating body is improved. Therefore, the fluid temperature can be accurately controlled. It also eliminates the danger of the engine heating up.

2) Since the control plate is provided on the frame so as to have an integral structure, the main flow of the fluid can be guided to the temperature sensing portion of the actuation body regardless of the change of the passage or the shape of the passage. Therefore, versatility is improved. Further, since only the control plate is provided on the frame, it is not necessary to change the flow path and its shape, and the cost can be improved.

3) Since the control plate is formed so as to extend from the frame to the rear end side of the actuating body to accommodate the second valve body, the main flow of the fluid hitting the second valve body does not go directly to the outlet. ,
Not only can it be reliably guided in the direction of the temperature sensing portion of the operating body, but also the fluid can be agitated in the vicinity of the operating body to make the temperature distribution of the fluid uniform and realize an accurate operation. Moreover, the second valve body can be protected.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG.
1 is a sectional view taken along line II-II 'of FIG. 1, FIG. 3 is a front view showing another embodiment of the present invention, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is cooling water for an internal combustion engine. FIG. 6 is an explanatory view showing a circuit, and FIG. 6 is a front sectional view showing a conventional example. A ... Temperature-sensing automatic valve 1 ... Actuator, 2 ... First valve body 3 ... Second valve body, 4 ... Energizer 5 ... Frame, 7, 7 '... Control plate

Claims (1)

[Scope of utility model registration request] 1. A front end side of an operating body which is provided at an intersection of a first flow path and a second flow path through which a fluid flows out and a third flow path through which a fluid flows, and which operates by a temperature change of the fluid. A first valve body provided to open and close the first flow path, a second valve body provided to the rear end side of the actuating body to open and close the second flow path, and a closed position of the first valve body. An urging body that urges the second valve body to the open position and a frame that is provided around the outer periphery of the actuating body, and changes the temperature of the fluid to the first flow path or the second flow path. In the temperature-sensing automatic valve for switching the flow path of the control unit, the control plate for guiding the flow of the fluid is controlled so as to guide the main flow of the fluid flowing out of the second flow path to the temperature sensing unit of the operating body. Provided integrally with the frame around the sensing section, and the outer peripheral surface of the sensing section is shielded from the main flow of the fluid. A temperature-sensing automatic valve, which is opposed to the opening of the third flow path.