JPS5814291Y2 - Thermal response valve device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thermally responsive valve device, which is particularly used in an exhaust gas purification system, which is one of the controls for automobile engines, and which responds to temperature changes by generating fluid signals. The present invention relates to a thermally responsive valve device.

This type of thermally responsive valve device has a body that is made of a material with excellent thermal conductivity, and a thermally responsive member, such as a bimetal disc, that is displaceable in response to temperature changes within the body. A valve member is disposed that operates the valve by the displacement operation of the body, and a thread is formed on the outer periphery of the body, for example, a water jacket 1 for engine cooling. A device that is screwed into a screw hole drilled on the outside of the engine intake manifold facing the engine room [for example, Japanese Patent Application Laid-Open No. 53-39333, Publication No. 1978 (Showa 53)
A device such as the one disclosed on April 6, 2007] is known.

At a mature age, it is necessary to secure enough space to use the screw holes in the water jacket and intake manifold or tools for screwing in the heat-responsive valve device, but various layer-resistant devices are placed around the engine body. It is difficult to secure space, especially when multiple thermally responsive valve devices with different characteristics (e.g. operating temperature) are installed due to the diversification of engine control, and it is even more difficult to secure space. The problem has arisen that it is 7 times too long.

As a measure to solve this problem, a passage for the fluid to be temperature detected is formed in the block made of gold layer, a screw hole is drilled toward this passage, and a heat-responsive type as described above is installed in this screw hole. The valve device is twisted into one assembly, and a gold layer is placed in the middle of a passage (for example, in the middle of a water bypass passage for a heater) located away from the engine body, where the temperature of the fluid whose temperature is to be detected is, for example, cooling water. It is often adopted to connect and interpose the passages of the blocks.

Even with such a device, it is necessary to drill a screw hole for installing a heat-responsive valve device in the metal block, and it is a hassle to screw the heat-responsive valve device, and as an assembly, it is difficult to use a gold-layer block. This is undesirable as it increases the size and weight of the device, which has the specified function.In addition, when multiple heat-responsive valve devices are installed on a gold-layer block, screw holes and It is necessary to maintain a predetermined distance between the screw hole and the screw hole, and the distance must be such that a screw-in tool can be used, which necessitates further increase in size.

In order to solve this problem, the main body of the device is made of a resin material, a passage is provided in the main body of the device through which the fluid to be temperature detected, such as cooling water or intake air, flows, and a large number of holes are provided adjacent to this passage. It is conceivable to provide a temperature-sensitive valve and to sequentially insert a thermally responsive member and a valve casing into this hole, thereby making the whole body smaller and lighter.

By the way, if the main body of the device is made of a resin material and a passage is formed in the main body for this purpose, the partition wall between the passage and the thermally responsive member cannot be made very thin due to material strength. inhibits conductivity.

As a result, for example, even though the temperature of the fluid to be detected changes and reaches a preset temperature that causes valve operation 2 to be performed, the thermally responsive member does not operate at that temperature and the valve does not operate. This causes a thermal response failure of the thermally responsive valve device in which the valve device does not operate.

The technical problem of the present invention is to make it possible to bring the passage of the fluid whose temperature is to be detected and the thermally responsive member as close as possible.

The technical means of the present invention taken for this purpose is to embed a metallic heat transfer member, which is stronger and has better thermal conductivity than the resin material, in a main body made of a resin material, and to conduct heat transfer within the main body. A number of holes are formed close to the member, a temperature-sensitive valve is built into the hole, and a passage for a fluid whose temperature is to be detected is formed within the heat transfer member.

This means works as follows.

That is, since the heat transfer member itself has high strength, the resin partition formed between the bottom of the hole and the heat transfer member can be made as thin as possible.

Therefore, the thermally responsive member of the temperature-sensitive valve housed in the body made of resin can be brought as close as possible to the heat transfer member, and since the heat transfer member itself has high heat conductivity, the fluid inside the heat transfer member The responsiveness of the temperature-sensitive valve to temperature changes is good.

In addition, since the heat transfer member, which is stronger than the resin material that forms the main body, is embedded integrally in the main body, it plays the role of reinforcing the main body, so the resin itself has an exceptionally high mechanical strength. There is no need to use anything.

An embodiment according to the present invention will be described below with reference to the accompanying drawings.

In a thermally responsive valve device 10 shown in the drawings, a first casing 12 and a second casing 13, which are valve casings, are provided in a body 11, which is a main body made of a resin material, and O-rings 14, 15 made of rubber. A cover member 20 is coupled to the body 11 by screws 21.22 and further has a first manual port 16, a first output port 17, a second manual port 18, and a second output port 19. has been done.

The 0-IJ songs 3, 24 disposed between the casings 12, 13 and the cover member 20 are for maintaining sealing performance.

The first input port 16 communicates with a negative pressure source, such as an engine intake manifold (not shown), and the first output port 17 communicates with a vacuum advancer (not shown) of the ignition timing control system.
(not shown).

Meanwhile, the second manpower port 18 communicates with an atmospheric source, such as an air cleaner (not shown), and the second output port 19 communicates with an EGR valve (not shown) of an exhaust gas recirculation system.

A first passage 25 is formed in the first casing 12, and the passage 25 is in continuous communication with the first manual port 16. A first working chamber 26 is formed in the casing 12, and the working chamber 2
6 is in constant communication with the first output port 17.

A first valve member 27 disposed in the working chamber 26 controls opening and closing of communication between the first passage 25 and the first working chamber 26, and comes into contact with a first valve seat 28 formed in the passage 25. This is possible, and is always urged downward in the drawing by the spring 29.

The first bimetal disk 30, whose outer periphery is supported by a mold 112a at the lower end of the casing 12 in the figure, has a plate shape, and senses the cooling water temperature, etc., which will be described later, and performs a reversal operation (snap action) at a first set temperature, as shown in the figure. It is held in the position shown in FIG.
Supported.

Therefore, the bimetal disc 30 urges and supports the first valve member 27 in its closed position via the rod 32 which is movably disposed in the shaft hole of the guide portion 12b formed in the casing 12. .

The first bimetal disk 30 is a thermally responsive member that is displaced in response to temperature changes, and a portion including the first valve member 27 and the first valve seat 28 is a valve member. constitutes a temperature-sensitive valve.

On the other hand, a second passage 33 is formed in the second casing 13, and the passage 33 is always in communication with the second manual port 18, and a second working chamber 34 is formed in the casing 13, and the working chamber 34 is in constant communication with the second output port 19.

The second valve member 35 disposed in the working chamber 34 is connected to the passage 33
It controls opening and closing of communication between the valve and the working chamber 34, can come into contact with a second valve seat 36 formed in the passage 33, and is always urged downward in the drawing by a spring 37.

The second bimetal disk 38, whose outer periphery is supported by the shoulder 13a at the bottom of the casing 13, has a plate shape as shown in the figure, and senses the cooling water temperature, etc., which will be described later, and performs a reaction movement (snap) in the second setting. action), and is urged and supported upward in the figure by a spring 39.

Therefore, the bimetal disc 38 urges and supports the second valve member 35 in its closed position via the rod 40 that is movably disposed in the shaft hole of the guide portion 13b formed in the casing 13.

The second bimetal disk 38 is a thermally responsive member that is displaced in response to temperature changes, and a portion including the second valve member 35 and the second valve seat 36 is a valve member. constitutes a temperature-sensitive valve.

Now, the body 11, which is the main body of the device, is made of a resin material, and the body 11 is made of a metal material that is a heat transfer material that is stronger and has better thermal conductivity than the resin material that forms the body 11, such as brass or other metal material. , a metal pipe 41 made of an alloy containing aluminum is embedded and integrally formed.

A passage 42 is formed in the metal pipe 41 through which a fluid whose temperature is to be detected, such as engine cooling water or intake air, flows, and both ends of the passage 420 are attached, for example, by rubber hoses, in the middle of a water bypass passage for a heater. .

Further, the resin material forming the body 11 is also selected to have excellent thermal conductivity, so that changes in temperature of the cooling water or the like flowing in the passage 42 can be transmitted to the bimetal discs 30 and 38 described above.

Next, the operation of the above configuration will be explained.

Assuming that cold water intake from the engine flows through the passage 42, first, when both the cooling water temperatures are lower than the first and second set temperatures, the first bimetal disc 30 is held in a position reversed from that shown in the figure. Valve member 27 is held in its open position.

Since the second bimetallic disc 38 is held in the position shown, the second valve member 35 is likewise held in its open position.

Therefore, negative pressure flows from the first output port 17 to the vacuum pump, and atmospheric air flows from the second output port 19 to the EGR.
It is supplied to Balfu respectively.

Next, when the cooling water temperature rises and becomes equal to or higher than the first set temperature, the first bimetal disk 30 is reversed and held at the position shown in the figure, so that the first valve member 27 comes into contact with the valve seat 28 as shown in the figure. The first passage 25 is closed.

Therefore, the supply of negative pressure to the vacuum attenuator is cut off.

Furthermore, when the cooling water temperature further rises to the second set temperature, the second bimetal disc 38 is held in the reversed position from the previously illustrated state, so the second valve member 35 is moved to the second set temperature.
It comes into contact with the valve seat 36 and the second passage 33 is closed.

Therefore, the supply of atmospheric air to the EGR valve is cut off.

As described in detail above, in the temperature sensing valve device according to the present invention, metal members such as the pipe 41 are embedded in the resin material forming the body 11, which is the main body of the device, and are integrally formed.
Since the pipe 41 has a structure in which a passage 42 is provided in which a fluid whose temperature is to be detected, such as cooling water, flows, it can be easily installed, for example, in the middle of a heater bypass passage in an engine cooling circuit.

In addition, when operating other control members using signals converted by thermal response, for example, when operating a vacuum advancer that controls the adjustment of the ignition timing of the engine, the device according to the present invention should be placed near this to control the temperature. By guiding the temperature of the fluid to be detected, the length of the signal circuit can be shortened and the response can be improved. It can significantly improve heat and pressure resistance, and in addition,
The temperature sensing member can be brought as close as possible to the heat transfer member,
It is possible to greatly improve the productivity of the main body while ensuring the same thermal response as that of a main body made of metal. Since a plurality of three-dimensional bodies can be arranged in the same main body and the entire device can be made compact, advantages can be maintained in terms of cost and productivity, so the practical effect is great.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a thermally responsive valve device according to the present invention, FIG. 2 is a plan view of the device in FIG. 1,
FIG. 3 is a sectional view taken along the line AA of the device in FIG. Explanation of symbols: In the figure, 11 is a main body made of a resin material, 41 is a heat transfer member, 30.38 is a thermally responsive member, 27° 28.35
．． 36 is a valve member, 42 is a passage, and 10 is a thermally responsive valve device.

Claims (1)

[Scope of utility model registration request] A main body made of a resin material, a metal heat transfer member that is stronger and has better thermal conductivity than the resin material forming the main body is embedded in the main body, and a large number of metal heat transfer members are embedded in the main body in proximity to the heat transfer member. A thermally-responsive valve device comprising a hole in the shape of a hole, a temperature-sensitive valve built into the hole, and a passage for a fluid whose temperature is to be detected in the heat transfer member.