JPH02240475A - Fluid control device - Google Patents

Abstract

PURPOSE:To form a fluid control device in is small size inexpensively by combining with a single solenoid coil the first plunger actuated in cooperation with the second plunger connected to the first and second valve units. CONSTITUTION:A solenoid coil 1 secures to its inside the first sleeve 3 mounting a cushion member 4. The first plunger 6 is slidably arranged in the first sleeve 3. When the second plunger 8 is lifted, the first valve unit 9, secured to the plunger 8, and the second valve unit 13, connected through a flexible member 12, are lifted, opening a fluid control device. Thus, the fluid control device can be formed in its small size inexpensively.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to fluid control devices for gas appliances, pneumatic equipment, etc. that use fluids such as gas and air, and particularly to fluid control devices used in these devices to prevent fluid leakage. Regarding no fluid control device.

[Prior Art and Problems to be Solved by the Invention] It has been known that solenoid valves have been used in fluid control devices for gas appliances. In this case, one solenoid valve is sufficient if it functions satisfactorily, but even if the solenoid valve is defective and leaks, the remaining solenoid valves can prevent the outflow of undesired gas due to valve leakage. It is customary to arrange a plurality of electromagnetic valves in series in the gas flow path (Fig. 4).

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

As mentioned above. Although this fluid control device has sufficient safety measures, it has the following problems due to the use of a plurality of solenoid valves.

I, expensive IE! The need for multiple solenoid valves with coils makes the entire device extremely expensive.

Port 8: Since a plurality of electromagnetic coils are provided, the amount of power consumed to operate the fluid control valve increases.

C. Since multiple electromagnetic units are provided, a large space is required, and the entire device becomes large.

Second, the configuration of multiple electromagnetic valves results in a gas flow path having a complicated shape, thus increasing fluid resistance.

In view of the above problems, the present applicant has proposed a fluid control device (FIG. 5) in which a single electromagnetic coil operates a single plunger in which a plurality of valve bodies are connected in series.

In this device, a first valve body 41A and a second valve body 41B are respectively arranged below on the axis of the plunger 39, and the respective valve bodies 41A and 41B are urged against the first and second valve seats. Springs 40A and 40B are provided. Further, the lower flange portion of the plunger 39 is accommodated in the upper recess 43 of the first valve element 41A, which has a slight play in the axial direction, without directly connecting the plunger 39 and the first valve element 41A in a rod-like manner. Furthermore, in order to connect the first valve body 41A and the second valve body 41B, upper and lower flange portions of the connecting rod 45 are inserted into the lower recess 44 of the first valve body 41A and the recess 45 of the second valve body 41B. accommodating each. The recesses 44 and 45 are each provided with a slight clearance in the axial direction with respect to the flange portion accommodated in them.

FIG. 5 shows that the gas flow path 33 is connected to the first and second valve bodies 41A and 4.
1B indicates the closed state, and when the electromagnetic coil 37 is energized, the plunger 39 and therefore the first and second valve bodies 41A
and 41B are attracted to the inner yoke 35, and the gas flow path is opened.

According to this fluid control device, the number of electromagnetic coils can be reduced by one, and the same function as the device shown in FIG. 4 can be achieved. However, as described above, the axial clearances formed in each valve body cannot be structurally large, so when the valve is opened, that is, when the plunger 39 is suctioned, the plunger and both valve bodies 4
1A and 41B are approximately rod-shaped, and the sleeve 38
If a foreign object gets stuck between the plunger 39 and the plunger 39 and the plunger 39 becomes stuck, or if the plunger 39 and both valve bodies 41A and 41B are kept together due to residual magnetism, both valve bodies will be stuck even if you try to turn off the current and close the valve. 41A and 41B may not be seated on both valve seats 42A and 42B.

[Problem to be solved by the invention]

It is an object of the invention to eliminate the disadvantages of the device of FIG. The purpose is to eliminate the uncertain operation that existed in the device shown in the figure.

[Means for Solving the Problems] According to the present invention, the above object is achieved by: a first sleeve fixed within an electromagnetic coil and having an upper portion closed by an inner yoke; and a second sleeve fixed to a lower portion. A first plunger formed to be slidable within the first sleeve, and a second plunger formed to be slidable within the second sleeve, having a non-magnetic cushion member on the upper part. a plunger; a first spring formed to bias a first valve element formed at the lower part of the second sleeve toward the first valve seat; Achieved by a fluid control device including a second valve body connected below the plunger and a second spring configured to bias the second valve body toward a second valve seat. be done.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to 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 the electromagnetic coil l, and a cushion member 4 is attached to the lower surface of the inner yoke 2. .

The first sleeve 3 has a bullet-shaped first plunge medium 6 to which a second sleeve 5 is fixed to the lower part of the first sleeve 3.
It is arranged so that it can slide inside. Also, the second sleeve 5
Inside, a cylindrical second plunger 8 having a non-magnetic cushion member 7 on its upper part is provided so as to be slidable with respect to the second sleeve. An annular first valve body 9 is formed in the lower part of the second sleeve 5 so as to be biased against a first valve seat 11 via a first compression spring 10 , and is attached via a flexible member 12 . A second valve body 13 connected to the lower part of the second plunger 8 is connected to the second valve body 13 via a second compression spring 14.
The valve seat 15 is biased towards the valve seat 15. In addition, 16 is a plunger holding spring that holds the second plunger 8 and the second valve body 13 in the vertical direction, 17 is a center guide rod that determines the center position of the second valve body 13, 18 is a gas inlet, and 19
indicates a gas outlet, and 20 indicates a gas flow path.

The operation of the fluid control device of the present invention will be explained below.

For convenience of explanation, it is assumed that the compressive force of the spring 10 is larger than the compressive force of the spring 14.

When the electromagnetic coil l is energized, the first plunger 6 is magnetized and tries to be attracted to the inner yoke 2, but due to the above-mentioned spring compression force relationship, the second plunger 8 is first attracted to the already magnetized first plunger 6. , and both plungers 6 and 8 rise together and are attracted to 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, opening the fluid control device. .

When the electromagnetic coil 1 is de-energized, both plungers 6.8 return to their initial positions by the urging forces of both springs 10 and 14. In this case the first plunger 6 and the first sleeve 3
Even if the space between the valve bodies 9 and 13 is fixed due to interposition of foreign matter, the second plunger 8 is a separate member from the first plunger 6, so it will descend without being affected, and the valve bodies 9 and 13 will be seated on the valve seats 11 and 15, respectively. .

Furthermore, even if the first plunger 6 is attracted to the inner yoke 2 due to residual magnetism, since both plungers 6°8 are separated by the non-magnetic cushion member 7, the residual magnetism of the second plunger 8 is N[ Then, the plunger 8 descends independently of the first plunger 6. Therefore, in either case, the fluid control device is in a closed state. According to the first embodiment, since the second plunger 8 and the second valve body 13 are connected by the flexible member 12, the opening degree of each valve can be easily adjusted.

The second embodiment shown in FIG. 2 is different from the first embodiment in that a second valve body 13 is disposed inside the first valve body 9, and the second plunger 8 The first and second valve seats 11 and 15 are arranged on substantially the same plane, and the second spring 10 is connected to the first valve body 13 via a connecting rod 21 which is a rigid member. It is arranged between the plunger 6 and the second plunger 8. According to this embodiment, since both valve seats are on the same surface, there is little resistance to gas passage.
Moreover, since both springs are not installed one above the other, there is an advantage that the fluid control device can be made smaller.

The third embodiment shown in FIG. 3 differs 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 parts 22 and 23. This is the integration of 5 and 5. The above makes it easy to maintain airtightness between these three members and simplifies the structure.

〔Effect of the invention〕

Since the present invention is configured as described above, a safe fluid control device without valve leakage can be achieved by using a first plunger in combination with - number of electromagnetic coils, instead of a conventional system that uses a plurality of expensive electromagnetic valves. Since this problem is solved by cooperating the second plunger connected to the first and second valve bodies, the device can be made inexpensive and compact. Furthermore, it has many advantages, such as that even if the first plunger becomes stuck to the sleeve due to the presence of foreign matter or the residual magnetism of the electromagnetic coil when the valve of the device is closed, the valve operation will not be hindered.

[Brief explanation of drawings]

1, 2, and 3 are longitudinal sectional views showing the first, second, and third embodiments of the present invention, and FIG. 4 and 5 are longitudinal sectional views showing the conventional example, respectively. . l... Electromagnetic coil, 2... Inner yoke,
3...first sleeve, 3...second sleeve, 6
...first plunger, 7.. cushion member, 8.. second plunger,
...first valve body, 1...first valve seat, 3...second valve body, 5...second valve seat, ...first spring...possible Flexible member, ...Second holder...Rigid member.

Claims (1)

[Claims] 1. A first sleeve (3) fixed within the electromagnetic coil (1) and closed at the upper part with an inner yoke (2), and a second sleeve (5) fixed at the lower part. together with the above first
a first plunger (6) formed to be slidable within the sleeve; and a non-magnetic cushion member (7) on the upper portion, formed to be slidable within the second sleeve. a second plunger (8); and a first valve body (9) formed at the lower part of the second sleeve.
) toward the first valve seat (11); and a second valve connected below the second plunger via a connecting member. Body (1
3); and a second spring (14) formed to bias the second valve element toward the second valve seat (15). 2. Device according to claim 1, characterized in that the connecting member is a rigid member (21). 3. Device according to claim 1, characterized in that the connecting member is a flexible member (12). 4. The device according to claim 4, wherein a plunger retaining spring (16) is interposed between the second plunger and the second valve body. 5. The device according to claim 1, wherein at least one valve body is disposed inside the other valve body. 6. The device of claim 1, wherein the first and second valve seats are formed on substantially the same plane.