JPS609501Y2 - temperature sensing valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a temperature sensing valve that controls the opening and closing of a fluid passage by sensing changes in ambient temperature.

In particular, the present invention relates to a temperature sensing valve equipped with a bimetal and a check valve, which is used in various exhaust gas purification control systems for automobile engines.

Conventionally, in this type of valve device installed in the exhaust gas purification system of an automobile engine, in order to simplify and make the system compact, a single valve device equipped with an input port and first and second output ports has been used. In the valve device, an orifice is disposed in a first passage that communicates with the input port and the first output port, and fluid communication is allowed only in the direction from the input port to the first output port through a bypass passage that bypasses the orifice. The temperature sensing valve has a configuration in which a check valve is disposed to communicate with the downstream orifice and a second output port, and a bimetal valve is installed in a second passage communicating between the downstream of the orifice and the second output port to detect changes in ambient temperature and control the opening and closing of the second passage. Already proposed.

Usually, a check valve is made of an elastic material such as rubber, and a seat surface of the check valve is formed on a body, and a projection projecting in the axial direction is formed at the center of the seat surface of the body.

The check valve is attached to the body by fitting the protrusion of the body into a through hole formed in the central body of the check valve, and a plate is further provided to hold the check valve.

However, in such conventional valve devices, the protrusion for mounting the check valve is integrally protruded from the body, and this protrusion is usually formed in a relatively deep concave location within the body. Therefore, since the check valve is attached to this protrusion, it is difficult to assemble, resulting in a decrease in productivity.In some cases, the valve device is assembled without the check valve being installed properly, resulting in the check valve not operating properly. There is a fear that it will be difficult to find distant relatives with stable and satisfactory performance.

In view of the problems of the prior art, the technical problem of the present invention is to improve the ease of assembling the check valve to the body.

The technical means of the present invention to remotely solve the above problem is to form a through hole in the central body of the check valve, and form a protrusion projecting in the axial direction in the center of the plate that is inserted and fixed into the inner wall of the body. Then, the check valve is attached to the plate using the axial protrusion of the plate, and then the check valve is supported by being assembled to the body.

In the conventional valve device described above, the seat surface of the check valve formed on the body has a protrusion at its center. There is a problem that the flatness of the seat surface deteriorates due to sink marks, undulations, etc., and the sealing performance with the check valve cannot be achieved sufficiently.However, according to the technical means devised above, the seat formed on the body Since no axial protrusion for mounting the check valve is formed on the surface, and the protrusion is formed on the plate, there is an advantage that the flatness of the seat surface can be easily ensured during manufacturing and the sealing performance with the check valve can be improved.

By the way, in order to ensure the flatness of the seat surface of the check valve and improve the sealing performance, another technical means is to form an axial protrusion for mounting the check valve on a member separate from the body. There is one disclosed in Japanese Utility Model Application Publication No. 53-75628.

That is, in this technical means, a stem equipped with a check valve is movably inserted into a central hole of an intermediate member that is inserted and fixed into the body, and the stem is constantly biased by a spring in the closing direction of the check valve. It has the following configuration.

In this way, since the check valve is supported in a floating state relative to the body, there is a risk that the opening/closing characteristics of the check valve will vary greatly due to vibrations that the body receives from the outside.

Further, since the opening pressure of the check valve is set by the mounting load of the spring and the elastic force of the head portion of the check valve, there is a problem in that the set pressure tends to vary between products.

However, according to the technical means of the present invention, the check valve is configured to be attached to the axial protrusion of the plate that is inserted and fixed into the inner wall of the body, so the check valve's opening/closing characteristics are hardly affected by vibration. blocked.

In addition, since the opening pressure of the check valve is set only by the elastic force of the umbrella, the check valve setting in the present invention is much easier to set than in the above-mentioned conventional technology, which depends on the mounting load of the spring. There is little variation in pressure between products.

An embodiment embodying the technical means of the present invention will be described below with reference to the accompanying drawings.

In the temperature sensing valve 10 shown in the drawings, input port 1
1, and a second body 14, which has a first output port 13 and a second output port 13', are integrally connected by a suitable connecting means such as ultrasonic welding.

The second body 14 has a sealing O-ring 1 inside the case 15.
6 and are integrally connected by crimping the upper end of the case 15.

The case 15 is made of a material having extremely good thermal conductivity, and is attached to the water jacket by screw means 15' while being submerged in, for example, engine cooling water.

A first passage communicating between the input port 11 and the first output port 13 is disposed in the second body 14, and an orifice 26 is installed in the first passage. fluid flow is restricted.

An umbrella-shaped check valve 25 made of an elastic member such as rubber is disposed in the bypass passage 18 that communicates between the upstream and downstream of the orifice 26 and bypasses the orifice 26. Fluid communication is allowed only from the input port 11 side to the first output port 13 side.

Furthermore, a valve 21 that opens and closes in conjunction with the snap action (reversal action) of the bimetal disc 20 is disposed in the second passage 17 that communicates the downstream of the orifice 26 and the second output port 13'.

In other words, when the temperature exceeds the set temperature, the bimetal disc 2
0 operates in reverse and receives the biasing force of the spring 22 as shown in the drawing, holding the valve 21 in its closed position and opening the second passage 17.
Close.

When the temperature is above the set temperature, the valve 21 is held in its open position and the second passage 17 is opened.

Reference numeral 30 denotes a plate having a protrusion projecting in the axial direction, and by fitting the axial protrusion of the plate 30 into a through hole formed in the central body of the check valve 25, the check valve 25 is first inserted into the plate 30. The plate 30 that is mounted and integrated with the valve 25 is press-fitted and fixed to the body 14.

The first through hole 19 formed in the axial protrusion of the plate 30
constitutes a part of the first passage, and the second through hole formed in the outer peripheral portion of the plate 30 constitutes a part of the bypass passage 18.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a temperature sensing valve according to the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1. 10...Temperature sensing valve, 11...Input port, 12.14...Body, 13...
・First output port, 13'...Second output port, 17...Second passage, 18...Bypass passage, 19...First penetration Hole, 20...
・Bimetal, 21... Valve, 25...
... Check valve, 26 ... Orifice, 3
0...Plate.

Claims (1)

[Scope of utility model registration request] a body including an input port, a first output port, and a second output port; a first passage formed in the body and communicating the input port and the first output port; an orifice that throttles the flow of fluid in the passage; a bypass passage that communicates upstream and downstream of the orifice and bypasses the orifice; and a bypass passage that is disposed in the bypass passage and extends only in the direction from the input port to the first output port. an umbrella-shaped check valve made of an elastic member that allows fluid communication; a second passage formed in the body and communicating between the orifice downstream of the first passage and the second output port; and a second passage disposed in the second passage. In a temperature sensing valve having a bimetallic valve that controls the opening and closing of the second passage by sensing a change in the ambient temperature, an axial protrusion that fits into a through hole formed in the central body of the check valve is provided at the center of the temperature sensing valve. inserting and fixing a plate into the inner wall of the body to support the check valve, forming a first through hole in the axial projection of the plate, and forming a second through hole in the outer peripheral part of the plate;
The temperature sensing valve is characterized in that the first through hole constitutes a part of the first passage, and at the same time, the second through hole constitutes a part of the bypass passage.