JP2776539B2 - Fluid control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas appliance using a fluid such as gas or air,
The present invention relates to a fluid control device such as a pneumatic device and, more particularly, to a fluid control device used for such a device without leaking fluid.

[Problems to be solved by conventional technology and invention]

It is known that an electromagnetic valve has been used in a fluid control device of a gas appliance. In this case, one solenoid valve is sufficient if it functions well.However, even if the solenoid valve is defective due to a valve leak, the remaining solenoid valves can prevent undesired gas outflow due to the valve leak. Generally, a plurality of solenoid valves are arranged in series in a gas flow path (fourth embodiment).
Figure).

In FIG. 4, a gas passage 33 is formed between a gas inlet 31 and a gas outlet 32, and two solenoid valves A,
B (usually the same solenoid valves A and B are used) is provided. Reference numeral 34 denotes a plate, 35 denotes an inner yoke, 36 denotes a cushion, 37 denotes an electromagnetic coil, 38 denotes a sleeve, 39 denotes a plunger, 40 denotes a spring, 41 denotes a valve body, and 42 denotes a valve seat.
The plunger 39 is fixed to the valve element 41.

As described above, this fluid control device is sufficient for safety measures, but has the following problems due to the use of a plurality of solenoid valves.

I. Since a plurality of electromagnetic valves having expensive electromagnetic coils are required, the entire instrument becomes extremely expensive.

B. Since a plurality of electromagnetic coils are provided, power consumption required for operating the fluid control valve increases.

C. Since a plurality of solenoid valves are provided, a large space is required, and the entire device becomes large.

D. Due to the configuration of the plurality of solenoid valves, the gas flow path has a complicated shape and therefore the fluid resistance increases.

In view of the above problems, the present applicant has
A fluid control device (FIG. 5) for operating one plunger having a plurality of valve elements connected in series has been proposed.

In this device, a first valve element 41A and a second valve element 41B are arranged below the axis of the plunger 39, respectively.
Springs 40A, 4 for urging A, 41B against the first and second valve seats
0B is provided. Further, the lower flange portion of the plunger 39 is housed in the upper recess 43 of the first valve body 41A having a small play in the axial direction without directly connecting the plunger 39 and the first valve body 41A integrally. Further, in order to connect the first valve body 41A and the second valve body 41B, the lower recess 44 of the first valve body 41A and the second valve body 41B are connected.
The upper and lower flange portions of the connecting rod 45 are respectively accommodated in the recesses 45 of the first embodiment. The recesses 44 and 45 are each provided with a small clearance in the axial direction with respect to the flange portion accommodated therein.

FIG. 5 shows a state in which the gas flow path 33 is closed by the first and second valve bodies 41A and 41B. When the electromagnetic coil 37 is energized, the plunger 39, and thus the first and second valve bodies 41A and 41B are opened. The gas is opened by the inner yoke 35 and the gas flow path is opened.

According to this fluid control device, one electromagnetic coil can be saved, and the same function as the device of FIG. 4 can be exhibited. However, as described above, since each play in the axial direction formed in each valve body is not so large as to be structurally large, when the valve is opened, that is, when the plunger 39 is sucked, the plunger and the two valve bodies 41 are closed.
A and 41B are substantially integrated, and foreign matter is clogged between the sleeve 38 and the plunger 39, and the plunger 39 is fixed,
If the plunger 39 and the two valve bodies 41A and 41B are kept integral by the residual magnetism, the two valve bodies 41A and 41B may not sit on both the valve seats 42A and 42B even if the current is stopped and the valve is closed. .

[Problems to be solved by the invention]

An object of the present invention is to provide a first electromagnetic coil combined with a single electromagnetic coil.
Plunger and a second valve connected to the first and second valve bodies.
4 eliminates the disadvantages of the device of FIG. 4 due to the use of a plurality of solenoid valves,
The purpose is to eliminate the uncertain operation of the device shown.

[Means for solving the problem]

According to the present invention, there is provided a first sleeve fixed in an electromagnetic coil and closed at an upper portion by an inner yoke, and slides in the first sleeve together with a second sleeve fixed at a lower portion. A first plunger formed so as to be capable of forming the second plunger,
A second plunger slidably formed within the sleeve, and a first valve body formed at a lower portion of the second sleeve is biased toward the first valve seat. A first spring, a second valve body connected below the second plunger via a connection member, and formed so as to bias the second valve body toward the second valve seat. This is achieved by a fluid control device with a second spring configured.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

In the first embodiment shown in FIG. 1, a first sleeve 3 whose upper part is closed by an inner yoke 2 is fixed inside an electromagnetic coil 1, and a cushion member 4 is attached to a lower surface of the inner yoke 2. . The first sleeve 3 is provided with a shell-shaped first plunger 6 having a second sleeve 5 fixed to a lower portion thereof so as to be slidable in the first sleeve 3. In the second sleeve 5, a cylindrical second plunger 8 having a nonmagnetic cushion member 7 on the upper part
Are slidably provided with respect to the second sleeve.
An annular first valve element 9 is provided below the second sleeve 5 in the first state.
A second valve body 13 formed to urge the first valve seat 11 via the compression spring 10 and connected to the lower part of the second plunger 8 via the flexible member 12 is connected to the second valve body 13. Urged toward the second valve seat 15 via the compression spring 14 of the first embodiment.
Reference numeral 16 denotes a plunger holding spring for vertically holding the space between the second plunger 8 and the second valve body 13, reference numeral 17 denotes a center guide rod for determining the center position of the second valve body 13, reference numeral 18 denotes a gas inlet, reference numeral 19 Denotes a gas outlet, and 20 denotes a gas flow path.

Hereinafter, the operation of the fluid control device of the present invention will be described. still,
For the sake of explanation, the compression force of the spring 10 is determined to be larger than the compression force of the spring 14.

When the electromagnetic coil 1 is energized, the first plunger 6 is magnetized and tends to be attracted to the inner yoke 2, but the first plunger 8 is first magnetized first due to the compression force relationship of the spring described above. The plungers 6, 8 are integrally lifted and sucked by the inner yoke 2. When the second plunger 8 rises, the first valve body 9 fixed to the plunger 8 and the second valve body 13 connected via the flexible member 12 rise, and the fluid control device is opened. .

When the energization of the electromagnetic coil 1 is stopped, the plungers 6, 8 return to the initial position by the urging forces of the springs 10, 14.
In this case, even if the space between the first plunger 6 and the first sleeve 3 is fixed by the presence of foreign matter or the like, the second plunger 8
Since it is a separate member from the first plunger 6, it descends without being affected, and the respective valve bodies 9, 13 are seated on the valve seats 11, 15.

Further, even if the first plunger 6 is attracted to the inner yoke 2 by the residual magnetism, the remnant magnetism of the second plunger 8 is demagnetized because the two plungers 6, 8 are separated by the non-magnetic cushion member 7. Then, the plunger 8 descends independently of the first plunger 6. Therefore, in any case, the fluid control device is closed. According to the first embodiment, since the second plunger 8 and the second valve body 13 are connected by the flexible member 12, it is easy to adjust each valve opening.

The second embodiment shown in FIG. 2 is different from the first embodiment in that a second valve body 13 is provided inside the first valve body 9 and that the second plunger 8 and the second And the first and second valve seats 1 are connected via a connecting rod 21 of a rigid member.
1 and 15 are arranged on substantially the same plane, and the second spring 10 is disposed between the first plunger 6 and the second plunger 8. According to this embodiment, since the two valve seats are on the same surface, there is an advantage that the gas passage resistance is small, and since the two springs are not vertically arranged, the fluid control device can be downsized.

The third embodiment shown in FIG. 3 is different from the second embodiment in that the first valve body 9, the second valve body 13 and the second sleeve are connected via bellows-like connecting portions 22 and 23. 5 is integrated. As described above, the airtightness between these three members can be easily maintained, and the structure can be simplified.

〔The invention's effect〕

Since the present invention is configured as described above, a safe fluid control device with no valve leakage is replaced with a first plunger in which a plurality of expensive solenoid valves are conventionally used in combination with a single electromagnetic coil. , And the second plunger connected to the first and second valve bodies is solved, so that the apparatus can be made inexpensive and small. Further, there are many advantages such that the operation of the valve is not hindered even if the first plunger is fixed to the sleeve by the interposition of foreign matter or the residual magnetism of the electromagnetic coil when the valve of the device is closed.

[Brief description of the drawings]

1, 2 and 3 are longitudinal sectional views showing first, second and third embodiments of the present invention, respectively, and FIGS. 4 and 5 are longitudinal sectional views respectively showing conventional examples. . 1 ... Electromagnetic coil, 2 ... Inner yoke, 3 ... First sleeve, 3 ... Second sleeve, 6 ... First plunger, 7 ... Cushion member, 8 ... Second plunger, 9 first valve body, 10 first spring, 11 first valve seat, 12 flexible member, 13 second valve body, 14 second spring , 15 ... second valve seat, 21 ... rigid member.

Claims (6)

(57) [Claims] 1. A first sleeve (3) fixed in an electromagnetic coil (1) and closed at an upper portion by an inner yoke (2), and a second sleeve (5) fixed at a lower portion. 1
A first plunger (6) formed slidably in the sleeve, and a non-magnetic cushion member (7) in the upper portion, and formed slidable in the second sleeve. A second plunger (8), and a first valve body (9) formed at a lower portion of the second sleeve, the first valve body (9) being formed to bias the first valve body (9) toward the first valve seat (11). And a second valve element (1) connected below the second plunger via a connecting member.
3) and a second spring (14) formed to urge the second valve body toward the second valve seat (15). 2. The connecting member according to claim 1, wherein said connecting member is a rigid member.
3. The fluid control device according to claim 1. 3. The fluid control device according to claim 1, wherein the connection member is a flexible member. 4. The fluid control device according to claim 3, wherein a plunger holding spring (16) is provided between the second plunger and the second valve body. 5. The fluid control device according to claim 1, wherein at least one of the valve bodies is disposed inside the other valve body. 6. The fluid control device according to claim 1, wherein the first and second valve seats are formed on substantially the same plane.