JPS6021272B2 - temperature sensing valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature sensing valve device that senses the temperature of cooling water in an automobile engine and controls the opening and closing of a fluid passage, and particularly relates to a temperature sensing valve device installed in an exhaust gas purification system of an automobile engine. This invention relates to a valve device.

There are two types of temperature-sensing valve devices that operate by sensing engine cooling water temperature: wax-type ones that utilize the volumetric expansion of thermowax, and bimetal-type ones that utilize the reversal action (snap action) of bimetallic discs. As is well known, this is true.

In addition, this type of temperature sensing valve device has an ON-OF function that controls the opening and closing of the lotus communication between the input boat and the output boat.
A so-called two-way switching valve device that performs F control and a so-called three-way switching valve device that mutually controls the opening and closing of the connection between an input boat and two different output boats have already been proposed.
By the way, the exhaust gas purification system for automobile engines is
Numerous devices are employed, such as exhaust gas recirculation, secondary air supply, and ignition timing control, making the purification system a complex piping arrangement and equipped with numerous temperature-sensing valve systems.

Therefore, in order to simplify the system and/or improve the ease of assembly in the exhaust gas purification system, there is a need for a temperature sensing valve device that has two valve functions in one device. Conventionally, as a valve device having two valve functions, for example, the two two-way switching valves mentioned above, the one described in Japanese Utility Model Application Publication No. 54-110835 has been known. , it is possible to make the system more compact and improve the workability of linking. However, while the conventional valve device described above is effective in systems that require a large number of two-way sliding valve functions, it is not effective in applying it to systems that require a three-way sliding valve function. isn't it. Therefore, the technical problem of the present invention is to provide a valve with two valve functions: a two-way switching valve and a three-way switching valve.

The technical measures taken to solve the above-mentioned technical problem are an input boat formed on the body, first, second, and third output boat means, and a first switch that operates in reverse by sensing the temperature of the object to be detected. 1. A second bimetallic disc, an atmospheric chamber formed in the body and adapted to be connected to the input boat, a first bimetallic disc formed in the body so as to be located at the opening to the atmospheric chamber of the first output boat means;
Valve seat, in response to the first bimetal disc, the first
a first valve that can be connected to the valve seat and controls opening and closing of communication between the input boat and the first output boat means; a fluid passage formed in the first valve and communicating with the second output boat means;
a second valve seat formed on the first valve so as to be located at the closing portion of the fluid passageway to the atmospheric chamber; and a second valve seat formed on the body so as to be located at the entrance portion of the third output boat means to the atmospheric chamber. 3 valve seats, and a second valve that can support the second and third valve seats in response to the second bimetal disc and mutually switches and controls the communication between the input boat and the second and third boat means. It is to have.

In this manner, the first valve is responsive to the first bimetal disc and is capable of assisting the first valve seat to control the opening and closing of communication between the input boat and the first output boat means.

Further, the first valve has a function of a second valve seat and a fluid passage, and the first valve has a function of a second valve seat and a fluid passage.
, can be supported by the third valve seat, and mutually switches and controls the communication between the input boat and the second and third output boat means.
Therefore, the first valve has a two-way switching valve function, and the second valve has a three-way switching valve function. Further, the valve device of the present invention has an atmospheric chamber in the body that is constantly communicated with the input boat, and the openings of the first, second, and third valve seats are provided in the first, second, and third output boat means. Since the configuration is such that one fluid pressure supplied to the input boat can be switched to three fluid circuits at different temperatures through the first and second valves. . Therefore, compared to the conventional valve device described above, which requires two fluid pressures supplied to two input boats to switch two fluid passages, each at a different temperature, this valve device is advantageous. The invented valve device is more effective in simplifying the system and improving roughening workability. An embodiment according to the present invention will be described below with reference to the accompanying drawings.

The drawing is a system diagram showing an exhaust gas purification system for an automobile engine. Temperature sensing valve device 1 shown in the drawings
0, the first body 11 and the second body 12 are integrally and airtightly connected by caulking means 13. An input boat 14, a first output boat 15, a second output boat 16, a third output boat 17, and a fourth output boat 18 are integrally formed in the first body 11, and the input boat 1
4 is a conduit 88 on the upstream side of the throttle valve 51 in the capretor 50', that is, on the air cleaner (not shown) side.
The first output boat 15 is connected to the vacuum retarder 61 of the distributor 60 through the conduit 89, and the second output boat 16 is connected to the signal chamber of the air cutoff valve 70 in the secondary air supply system. 71 via a line 82, and the third output boat 17 is connected to a signal chamber 81 of an EGR valve 80 in an exhaust gas recirculation system via a line 83.
The fourth output boat 18 is connected to the vacuum advancer 62 of the distributor 60 through a conduit 84. On the other hand, the second body 12 is fixed to the water jacket 90 of the engine by means of screws, for example, and is exposed within the jacket 90.

The second body 12 is made of a metal material with good thermal conductivity, and is fixed in a state where it is submerged in the cooling water in the jacket 90, and is capable of transmitting temperature changes of the cooling water to the bimetallic disk described later. There is. A first bimetal disc 20 and a second bimetal disc 21 are disposed in the lower part of the second body 2 with a ring 19 in between.
The outer peripheral part of the bimetal disc 20 is supported by the lower end shoulder part 22 of the first body 11, and the second bimetal disc 20 is supported by the lower end shoulder part 22 of the first body 11.
1 is urged upward in the drawing by a spring 23.
Both bimetal discs 20 and 21 sense the temperature of the water inside the water jacket 90 and perform a reversal operation (snap action), and the first bimetal disc 20
When it reaches the first set temperature (T.), it changes from the illustrated state to the inverted state, and when the second bimetal disk 21 reaches the second set temperature (T2, however, T2 - T,), it changes from the illustrated state to the inverted state. It is arranged so that the state is the same.
The first valve 24, which operates in response to the first bimetal disc 20, is always urged downward in the drawing by a spring 25. A chamber 26 is formed between the first body 11 and the first valve 24, and the chamber 26 is constantly connected to the input boat 14 via a passage 27, forming an atmospheric chamber 26. The first valve 24 can come into contact with a first valve seat 28 that protrudes from the first body 11 into the atmospheric chamber 26, and controls opening and closing of the passage between the atmospheric chamber 26 and a passage 29 that is connected to the first output boat 15. It is something to do. That is, - the first valve 24
The two first bimetal discs function as a so-called two-way switching valve that controls the opening and closing of the connection between the input boat 14 and the first output boat 15 in response to the two first bimetal discs. On the other hand, a second valve 31 that responds to the operation of the second bimetal disc 21 via a transmission rod 30 is disposed concentrically with the first valve 24 and is constantly urged downward in the drawing by a spring 32. .

A third output boat 17 and a fourth output boat 18 pass through the atmospheric chamber 26 via passages 33 and 34, respectively, and the second output boat 16 passes through the passage 36 and the passage 36 formed in the first valve 24. The lotus is suitable for the atmospheric chamber 26 through. The second valve 31 includes a second valve seat 37 protruding from the first body 11 into the atmospheric chamber 26 and a third valve seat 37 formed on the first valve 24.
It can come into contact with the valve seat 38 and the input boat 14
and the second output boat 16, and the input boat 14, the third output boat 17, and the fourth output port 18,
It functions as a so-called three-way switching valve that mutually controls switching. Here, the second valve 31 functions as the above-mentioned three-way valve when the first valve 24 is in the closed position supporting the first valve seat 28, and the first valve 24 acts as the three-way valve. When in the open position away from the valve seat 28, the second output boat 16 is in constant communication with the input boat 14, and the second valve 31 is in communication with the input boat 14, the third output boat 17, and the fourth output boat 18. It functions as a two-way sliding door valve that controls the opening and closing of the lotus passage. Note that the guide portion 39 integrally formed with the first body 1 is for guiding the tubular portion 40 of the second valve 24. Now, the vacuum retarder 61 and vacuum advancer 62 of the distributor 60 are
The ignition timing of the distributor 60 is controlled to be retarded or advanced, and the vacuum retarder 61 is connected to the intake manifold 52 of the engine via a pipe 85.
while the vacuum advancer 62 is connected to the advance port 53 of the carburetor 50 via a conduit 86.

The air switching valve 70 also directs secondary air, which is pumped from an air pump (not shown) to the boat 72, from the boat 73 to the exhaust manifold (not shown) and from the boat 74.
The signal chamber 41 communicates with the intake manifold 52. Further, the ECR valve 80 controls the amount of recirculation of engine exhaust gas, and the signal chamber 81 is communicated with the EGR boat 54 of the capretor 50 via a pipe 87. Moreover, orifices 84a, 85a, and 87a are arranged in the conduits 84, 85, and 87, respectively.
Next, the operation of the temperature sensing valve device having the above structure will be explained.

Intake manifold negative pressure is supplied to the vacuum retarder 61, and by sensing the negative pressure, the vacuum retarder 61
1 is activated, while the vacuum advancer 62 is supplied with negative pressure in response to changes in the opening degree of the throttle valve 51.
The vacuum advancer 62 is activated by sensing the negative pressure. In addition, the air switching valve 7 is supplied with negative pressure to the intake manifold, and the air switching valve 7 detects the negative pressure.
0 is activated. Furthermore, the EGR valve 80 is supplied with negative pressure in response to changes in the opening degree of the throttle valve 51, and the EGR valve 80 is operated upon sensing the pressure. Temperature sensing valve device of the present invention 1, vacuum retarder 61, vacuum advancer 62, air switching valve 7 depending on the temperature
0. EGR valve 801 controls the supply of atmospheric air and switches the signal pressure. First, the engine cooling water temperature in the water jacket 90 reaches the second set temperature (T2).
In the following cases, the first and second bimetal discs 2
0 and 21 are both kept in the state shown in the drawing. Therefore,
The first valve 24 abuts the first valve seat 28 and the second
Since the valve 31 is in contact with the second valve seat 37 and is held in contact with the third valve seat 381, atmospheric air is supplied from the input boat 14 to the third and fourth output ports 17 and 18, but the atmosphere is supplied to the first and fourth output ports 17 and 18. It is not supplied to the second output boats 15 and 16. Next, the cooling water temperature is the second set temperature (T2)
In the above case, the second bimetal disk 21 is held in an inverted state from the state shown in the drawing.

Therefore, the second valve 31 is separated from the third valve seat 38 and supports the second valve seat 37, so that the third and fourth valve seats
Atmospheric supply to the output boats 17 and 18 is cut off, and the second
Atmospheric air is supplied to the output boat 16. Further, when the engine cooling water temperature becomes equal to or higher than the first set temperature (T, where T,>T2), the first bimetal disk 20 is held in an inverted state from the state shown in the drawing.

Therefore, the first valve 24 is maintained apart from the first valve seat 28, so that the first output boat 15 is supplied with atmospheric air. As described above in detail, the temperature sensing valve device according to the present invention has two valve functions, a two-way switching valve and a three-way switching valve, so when applied to various exhaust gas purification systems of automobile engines, etc. In this way, it is possible to easily simplify the system or improve the work of attaching silk, and the practical effects thereof are extremely valuable.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment in which the temperature sensing valve device of the present invention is applied to an exhaust gas purification system for an automobile engine. 10: Temperature sensing valve device, 11, 12: Body, 14
: input boat, 15, 16, 17, 18: output boat,
20, 21: bimetal disc, 24: first valve,
26: atmospheric chamber, 31: second valve, 36: passage, 28,
37, 38: Valve seat.

Claims (1)

[Claims] 1 a body, an input port formed in the body and a first,
second and third output port means; first and second bimetal disks that sense the temperature of the object to be detected and operate in reverse at different set temperatures; an atmospheric chamber formed within the body and constantly communicating with the input port; a first valve seat formed in the body so as to be located at an opening of the first output port means to the atmospheric chamber; a first valve seat responsive to the first bimetal disc; A first valve that controls opening and closing of communication between the input port and the first output port means, a fluid passage formed in the first valve and communicating with the second output port means, and an opening of the fluid passage to the atmospheric chamber. a second valve seat formed in the first valve so as to be located at the first valve; a third valve seat formed in the body so as to be located at the opening of the third output port means to the atmospheric chamber; a second valve that is capable of contacting the second and third valve seats in response to a second bimetal disk and that mutually switches and controls communication between the input port and the second and third output port means; A temperature sensing valve device characterized by: