JPS62237186A - Gas cut-off valve - Google Patents

Abstract

PURPOSE:To reduce operating power of a cut-off valve, by preventing that the sliding resistance of an O-ring of a gas sealing means is badly influenced by operating power, when the cut-off valve is closed. CONSTITUTION:A contacting joint between the first plunger 6 and the second plunger 5 is tight, and these plungers 6, 5 are attracted with each other, by operation of magnetic line of force of a permanent magnet 1. When an excitation current is sent to a coil 12 by valve closing signal, the magnetic line of force at the joint between both plungers 5, 6 is weakened, and a valve disk 8 is closed by a spring 9. Then, the magnetic line of force of the permanent magnet 1 acts on the contacting joint between both plungers 5, 6, and both plungers 5, 6 are attracted with each other. As only the second plunger 5 is formed with gas seals 15, 18, small operating power is enough to drive the cut-off valve.

Description

[Detailed Description of the Invention] A.9 Purpose of the Invention E.1. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a gas cutoff valve provided at an inlet of a supply pipe of a gas consumer such as city gas or propane gas.

E2. Conventional technology In order to prevent unexpected accidents caused by gas, there is a microcomputer meter in which a microcomputer built into the gas meter determines an abnormality in the gas flow rate and closes the gas cutoff valve built into the gas meter. As shown in Japanese Patent Application No. 61-7419, the shutoff valve part and the return part were constructed separately, and in order to open the valve after closing, the return shaft was rotated to return the valve.

In addition to the gas meter, it also works in conjunction with the gas leak alarm.
There is a gas cutoff valve that closes in response to a gas leak signal from an alarm, and this valve has a cutoff valve part and a return part that are integrally constructed, as seen in Japanese Patent Application Laid-Open No. 61-8619.

E30 Problems to be Solved by the Present Invention Of the above two conventional technologies, the former has separate structures for the shutoff valve part and the return part, which requires time and effort to assemble, resulting in a high price and a large shape. In addition to this, there was a problem in that if the return shaft was intentionally stopped while it was rotating after the valve was closed, the valve would no longer operate.

In addition, if the shutoff valve part and the return part are integrated into one structure as in the latter case, the movable plunger must be gas-sealed with an O-ring or diaphragm, and the sliding resistance and displacement resistance will have an adverse effect on the shutoff operation. That is, there is a problem in that the operating power required to close the valve increases and the variation also increases.

1 Structure of the Invention Low 10 Means for Solving Problems This invention integrates the shutoff valve part and the return part to facilitate assembly, and when the shutoff valve is closed, the O-ring of the gas seal means is fixed. This is an attempt to solve the above problem by creating a structure in which the sliding resistance does not adversely affect the operating power.

That is, a first plunger having a valve body fixed to one end;
a spring that biases the valve body in the valve-closing direction; a second plunger disposed concentrically with the first plunger and with one end abutting the other end of the first plunger;
a return button fixed to the other end of the plunger, a return spring that biases the second plunge in the direction of the return button, and a strike 7 that determines the position of the second plunge against the force of the return spring. a permanent magnet that generates lines of magnetic force that flow from one of the plungers to the other through the abutting portion to attract both plungers at the abutting portion; a coil wound around the outer periphery of both plungers; and a second plunger. and a gas seal member provided at the valve body, and the attraction force of both plungers by the permanent magnet and the force of the return spring are set to be larger than the force of the spring that urges the valve body in the valve closing direction. do.

Low 28 action Normally, the shutoff valve is open. At this time, the abutting portions of both plungers are in close contact with each other, and are attracted by the action of magnetic lines of force caused by the permanent magnets.

The second plunger hits the stopper and is positioned by the force of the return spring. In other words, return position (valve open state)
It is in. When an exciting current flows through the coil due to an abnormal flow rate of gas or a valve closing signal caused by a gas leak alarm, the lines of magnetic force flowing through the abutting portion of both plungers weaken, the attraction force due to magnetic force decreases, and the first plunger The spring moves away from the plunger in the valve closing direction (away from the second plunger), and the valve body hits the valve seat to close (shut off) the valve. When an abnormality such as a gas leak has been recovered and the shutoff valve is to be opened (reset), a return button provided on the second plunger is pressed. The second plunger then moves toward the first plunger against the return spring.
When the tip of the second plunger (the side without the return button) hits the tip of the first plunger on the side without the valve body, the lines of magnetic force of the permanent magnet pass through the abutting portion of both plungers, and both plungers is attracted by magnetic force at this abutting portion. If you release your hand from the return button, the second plunger will return to its original position while adsorbing the first plunger, and the valve body fixed to the first plunger will separate from the valve seat and open the valve. do. The second plunger then hits the stopper and stops. This valve-open state continues until the coil is energized thereafter.

A gas seal member is provided on the second plunger, but when the second plunger is pushed by hand and moved in the direction of the first plunger in the valve closing position, it returns from that position along with the first plunger that has been attracted. When returning with the force of the spring, it is moved by hand or with the return spring, so it can overcome the sliding resistance of the gas seal member and move reliably.

Row 3. Example In Fig. 1, (1) is a permanent magnet and yoke (2).

(3), +41, the first plunger (6), and the second plunger (5) form a magnetic path. 1st
One end of the second plunger (6) (left end in the figure) and one end (right end in the figure) of the second plunger (5) are butted against each other as shown in the figure, and they are attracted by the magnetic force of the magnetic lines of force passing through this butt part. There is. (7) is a spring receiver, and (8) is a valve body, both of which are fixed to the other end of the first plunger.

(9) is a spring that biases the valve body (8) in the valve closing direction (to the right in the figure). αω is a return spring that urges the second plunger (5) to the left in the figure, that is, in the valve opening direction; (11) is a bobbin around which a wire ring (12) is wound; (13) is a cylindrical guide vibe; The two plungers (5) and (6) are slidably guided in the left and right directions in the figure. (14) is the support member (20
) and the 0 ring inserted between the guide vibe (13),
(15) and (18) are gas seal members provided on the second plunger (5), both of which are composed of O-rings.

The second plunger (5), which is urged in the valve opening direction (to the left in the figure) by the return spring α, acts as a stopper (it is stopped from moving to the left by the yoke (4), as shown in the figure). The stop position is determined at the position.

(16) is a return button fixed to the other end (left end) of the second plunger (5), (17) is the gas meter valve seat (21
), and (19) is a gasket used to attach the support member (20) that supports the gas cutoff valve to the gas meter with the mounting screw (22). Symbol (A) indicates the butt portion of both plungers. The force of the return spring 00) and the attraction force due to the magnetic force of the abutting portion of both plungers are both set to be larger than the force of the spring (9), and in particular the force of the return spring αω is the force of the spring (9) and the gas seal. It is determined to be sufficiently larger than the sum of the sliding resistance of the member (18) and the sliding resistance when both plungers move leftward inside the guide vibe (13). The spring (9) biases the first and second plungers (6) and (5) in the valve closing direction (to the right in the figure), and the return spring αω biases the valve in the valve opening direction (to the left in the figure). ing.

Now, when an excitation current temporarily flows through the wire ring (12) due to a gas leak signal, etc., the butt part (A) of both plungers
As the lines of magnetic force passing through the plunger decrease and the attraction force becomes smaller, the abutting portions of both plungers are separated by the action of the spring (9).
The first plunger (6) moves in the valve closing direction (to the right in the figure), and the valve body (8) is pressed against the valve seat (21) to shut off the gas passage (17).

At this time, the sliding resistance of the first plunger moving to the right (valve closing direction) is only the friction between it and the guide vibe (13), which is a small amount of solder, and the sliding resistance of the O-ring etc. None. Therefore, it is light and operates reliably. To return (open) the gas cutoff valve that is in the cutoff (closed) state, press the return button (16) to the right in the figure, that is, in the valve closing direction.
When the right end of the second plunger is moved until it comes into contact with the left end of the first plunger, which is in the valve-closed position, the attraction force due to the magnetic lines of force of the permanent magnet acts, causing both plungers to come into contact.

(butting part). There, the return button (
16), both plungers move in the valve opening direction (to the left in the figure) by the force of the return spring αω, and move to the illustrated position where they come into contact with the yoke (4), which acts as a stopper, and stop.

The permanent magnet (1) keeps the valve open as shown until the next cutoff signal excites the wire ring (12).

In another embodiment shown in FIG. 2, the gas seal member (25) provided on the second plunger (5) is composed of one O-ring inserted between the plunger (5) and the guide vibe (13). This is what I did. In addition, Figure 2 shows the shutoff valve built into the gas meter (23), and (24) is the cover for the return button (16), which is always attached to the gas meter (23), so it will not open during the return operation. First, remove this cover and perform the return operation.

Effects of the Invention According to the present invention, the shutoff valve part and the return part can be integrated.
Easy to assemble and process, and the whole can be made smaller.

Since the first plunger does not have a gas seal, the electric power for exciting the coil, that is, the operating electric power for driving the gas cutoff valve, is small, and variations can be reduced.

When the valve is open by operating the return button, it can be closed at any time by sending an excitation signal to the coil.

Therefore, it is not possible to intentionally operate the return button from the outside to maintain the valve in the open state, so it is possible to prevent the valve from being held open due to mischief.

[Brief explanation of drawings]

FIG. 1 is a horizontal sectional view of an embodiment of the present invention, and a horizontal sectional view of another embodiment of FIG. 2 in which a shutoff valve is attached to a gas meter. (11...Permanent magnet (4)...Yoke (5) serving as a stopper...Second plunger (6)...First plunger (8)...Valve body (9)...・Spring αO)...Return spring (12)...Core ring (13) ・ ・ ・Guide pipe (15) (18) ・・Gas seal member (16)
...Return button

Claims (1)

[Claims] A first plunger with a valve body fixed to one end, a spring that biases the valve body in the valve closing direction, and arranged concentrically with the first plunger and with one end abutting against the other end of the first plunger. a return button fixed to the other end of the second plunger, a return spring that biases the second plunger in the direction of the return button, and a second plunger that presses the second plunger against the force of the return spring. a stopper that determines the position of the plunger, a permanent magnet that generates magnetic lines of force flowing from one of the plungers to the other through the abutment part to attract both plungers at the abutment part, and a wire wound around the outer periphery of both plungers. and a gas seal member provided on the second plunger, wherein the attraction force of both plungers by a permanent magnet and the force of the return spring are greater than the force of the spring that urges the valve body in the valve closing direction. A gas cutoff valve characterized by the following.