JPH0348467Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a shutoff valve that can be operated with small electric power by pulling up the valve body with the force of a spring.

[Conventional technology]

In a propane gas supply device or the like, an electric shutoff valve that opens and closes a gas flow path is suitable for a small size and low power consumption. In particular, from the standpoint of the complexity of electrical wiring and safety, it is best to use a battery as a power source to open and close the valve.

However, in conventional shutoff valves that use back pressure to close the valve body, the larger the diameter of the valve seat, the greater the influence of back pressure, and the greater the power required to open the valve.

Therefore, as a countermeasure to this problem, a device as shown in FIG. 4 has been devised. This idea is an attempt to reduce the influence of back pressure when the valve is opened by providing a so-called double valve mechanism in the solenoid valve.

That is, the configuration is such that the plunger 5 is formed into a hollow shape and is slidably provided in the plunger tube 7', and a plunger end 8 is fixedly installed at the lower end (in the drawing) of the plunger 5. A stem 9' is fixedly attached to the stem 9', and an auxiliary valve body 29 is connected to the tip of the stem 9'. Furthermore, a rod 15 is provided vertically to the suction element 14 installed opposite to the upper end of the plunger 5, and a compression spring 17 is placed between the spring receiving plate 16 fixed to the lower end of the rod 15 and the plunger end 8. ' has been set.

Further, the sub-valve body 29 has a hemispherical contact surface 30, and a sub-valve seat 32 having a chamfered seat surface 31 facing the contact surface 30 is attached to the main valve body 33. The main valve body 33 is provided so as to be movable within a certain range in the axial direction with respect to the sub-valve body 29.

The opening 3 of the sub-valve seat 32 is located in the upper part of the main valve body 33.
A communication hole 35 is provided for the main valve seat 2 at the bottom.
A valve rubber 36 for 6 is provided.

In the figure, 2 is a solenoid, 37 is a gas supply pipe, 38 is a valve chamber, and 39 is an outlet side pipe.

To close the shutoff valve with the above configuration, the power to the solenoid 2 is stopped, and the suction element 14 and the plunger 5 are closed.
By releasing the adsorption of the compression spring 17'
pushes down the main valve body 33, thereby causing the main valve seat 2
6 is closed. At this time, the sub-valve body 29 is
Closely attached to 2.

On the other hand, when opening the valve, the plunger 5 is attracted to the suction element 14 by energizing the solenoid 2, and the sub-valve seat 32 opens before the main valve body 33 is separated from the main valve seat 26, so that the valve chamber 38 (high pressure side) approaches the internal pressure (low pressure side) of the outlet pipe 37. Therefore, the main valve body 33 can be pulled up without being significantly affected by back pressure.

However, even with this structure, the main valve seat 2
As the diameter of the solenoid valve 6 becomes larger, the influence of back pressure cannot be ignored, the electric power required to pull up the large and heavy main valve body 33 increases, and the solenoid valve itself inevitably becomes larger. Therefore, there was a problem in that it was not possible to adopt a battery drive system with optimal specifications.

[The problem that the idea attempts to solve]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a shutoff valve that can open and close a large-diameter valve with a small amount of electric power, such as by using a battery.

[Means to solve the problem]

In order to achieve the above object, the shutoff valve according to the present invention is provided with a suction element at the proximal end of the plunger tube, a hollow plunger inside the plunger tube so as to be slidable, and a secondary valve at the tip of the plunger. In a solenoid valve including a valve body and a compression spring elastically disposed between the sub-valve body and the suction element, a sub-valve seat facing the sub-valve body and opened and closed by the sub-valve body. A main valve body having a main valve body is slidably provided on the outer periphery of the plunger tube, and a tension spring having a force weaker than the compression spring is stretched between the main valve body and the solenoid valve body. That is.

[Effect]

When closing the valve, the compression spring pushes down the sub-valve body and the main valve body against the force of the tension spring, thereby closing the sub-valve seat and the main valve seat.

On the other hand, when opening the valve, the plunger pulls up the sub-valve body against the force of the compression spring due to the suction force of the suction element, so the sub-valve seat opens and the back pressure is released. Then, the main valve body is pulled up by the force of the tension spring.

At this time, since the diameter of the sub-valve body is small, the sub-valve body is hardly affected by back pressure, and therefore, the plunger (suction element) only needs to have the force to compress the compression spring. Further, since no electric power is required to pull up the main valve body, the amount of electric power consumed can be reduced even if the diameter of the valve is large.

〔Example〕

FIG. 1 shows a spring force opening/closing shutoff valve (state when the valve is opened) according to the present invention.

The gist of the present invention is that the sub-valve body 1 can be operated independently by the excitation force of the solenoid 2, and the main valve body 3 can be operated independently by the force of the tension spring 4 when opening the valve.

That is, the configuration is such that the plunger 5 is formed in a hollow shape, and is provided so as to be slidable within a plunger tube 7 that is provided with a portion extended outside the electromagnetic valve main body 6, and the plunger 5 A plunger end 8 is fixed to the lower end (in the drawing) of the plunger end 8, a stem 9 is fixed to the plunger end 8, and the sub-valve body 1 is connected to the head 10 of the stem 9.

The sub-valve body 1 has a sub-valve rubber 12 fitted into an annular groove 11 formed at the tip of a substantially cylindrical main body, and a stem gripping hole 1 extending axially from the base end of the main body.
3. In this embodiment, the sub-valve body 1 is formed to slide within the plunger tube 7, but this is not necessarily necessary, and the point is that the sub-valve rubber 12 only needs to be in close contact with the sub-valve seat 18. The reason why the head 10 of the stem 9 is formed into a hemispherical shape is to facilitate the swinging motion of the sub-valve body 1 and to improve the close contact with the sub-valve seat 18.

A spring force adjusting rod 15 is provided in axial contact with an attractor 14 disposed at the upper end of the plunger tube 7 facing the upper end of the plunger 5, and a spring force adjusting rod 15 is fixedly attached to the lower end of the rod 15. A compression spring 17 is elastically installed between the receiving flange plate 16 and the plunger end 8.

Further, a main valve body 3 having a sub-valve seat 18 facing the sub-valve body 1 is slidably provided on the outer peripheral edge of the lower end of the plunger tube 7, and the main valve body 3 and the electromagnetic valve body 6 are connected to each other. A tension spring 4, which has a weaker force than the compression spring 17, is connected between the lower part and the compression spring 17. (preset) is set in a tensioned state (retracted when the valve is opened).

The main valve body 3 includes a sliding pipe portion 19, a flange-shaped valve plate 20, and a sub-valve seat 1 facing the sub-valve rubber 12.
8, the sliding tube portion 19 is provided with a plurality of gas inflow ports 21 on the circumference, and a tension spring retaining collar portion 22 is provided in an annular shape. A main valve rubber 24 is fitted into the groove 23.

A similar flange 25 is formed at the lower part of the electromagnetic valve body 6 opposite to the spring holding flange 22, and the ends of the tension spring 4 are fixed to both flange parts 22, 25. The flange portion 25 also serves as a stopper for the main valve body 3.

That is, in FIG. 1, the solenoid 2 is energized, the attractor 14 attracts the plunger 5 against the force of the compression spring 17, the sub-valve body 1 is pulled up integrally, and the tension spring 4 is pulled up against the sub-valve body. 3 is pulled up along the outer periphery of the plunger tube 7 and brought into contact with the stopper 25.

Here, a slight gap L is set between the auxiliary valve seat 18 and the auxiliary valve rubber 12 to prevent the plunger 5 from colliding with the suction element 14 due to the inertial force of the main valve body 3, and as will be described later. When the valve is closed, the sub-valve body 1 runs idle.
It has the effect of improving the barrier properties.

FIG. 2 shows the state of the above-described spring force open/close shutoff valve when the valve is closed.

That is, if the energization to solenoid 2 is stopped,
The suction element 14 loses its suction power to the plunger 5,
A compression spring 17 pushes down the plunger end 8. The sub-valve body 1 (sub-valve rubber 12) has a compression spring 1
The force of 7 makes contact with the sub-valve seat 18, and the sub-valve seat 18
At the same time as closing the valve, the main valve body 3 is synchronously pushed down while the idle tension spring 4 is extended against the tensile force of the tension spring 4. The main valve body 3 slides on the outer periphery of the plunger tube 7 and descends, pressing the main valve rubber 24 against the main valve seat 26 to obtain the valve closed state.

FIG. 3 shows the process from this valve closed state to the valve open state shown in FIG. 1.

That is, by energizing the solenoid 2,
The plunger 5 is drawn to the suction element 14 and lifts up the sub-valve body 1 as a whole, but in the initial stage, the sub-valve rubber 12 separates from the sub-valve seat 18, and the pressure in the valve chamber 27 ( (high pressure side) escapes from the inlet 21 of the main valve body 3 through the sub valve seat 18 to the outlet pipe 28 on the low pressure side. As a result, the back pressure is released, and the main valve body 3 is reliably pulled up even by the force of the tension spring 4, which is set to be weak. (See Figure 1 for the valve open state).

[Effect of idea]

As described above, in the present invention, the power required to pull up the main valve body when opening the valve is replaced by the force of the tension spring, so even if the diameter of the valve becomes large, it can be driven with less power. be.

Therefore, a dry battery can be used as a power source, and a shutoff valve with excellent safety and ease of installation can be obtained.

Furthermore, even if the valve has a large diameter, the solenoid valve main body can be made compact, so the gas supply device and the like can be downsized.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the spring force open/close type shutoff valve according to the present invention in the open state, Fig. 2 is a longitudinal cross-sectional view showing the valve in the closed state, and Fig. 3 similarly shows the state immediately before opening. FIG. 4 is a longitudinal sectional view showing a conventional shutoff valve. 1...Sub-valve body, 3...Main valve body, 4...Tension spring, 5...Plunger, 6...Solenoid valve body, 7...
...Plunge tube, 14...Suction element, 17...
...Compression spring, 18...Sub-valve seat, 26...Main valve seat.

Claims (1)

[Scope of utility model registration request] A suction element is provided at the base end of the plunger tube, and a hollow plunger is slidably provided within the plunger tube, and a sub-valve element is provided at the tip of the plunger, and between the sub-valve element and the suction element. In a solenoid valve having a compression spring, a main valve body having a sub-valve seat that faces the sub-valve body and is opened and closed by the sub-valve body is slidably provided on the outer periphery of a plunger tube. A spring force opening/closing type cutoff valve further comprising a tension spring having a weaker force than the compression spring stretched between the main valve body and the electromagnetic valve body.