JPS60256691A - Gas safety device - Google Patents

Abstract

PURPOSE:To enable control of reset at an arbitrary position, by a method wherein an axiliary valve is vertically movably located above a main valve which opens and closes a passage for reset installed in the main valve. CONSTITUTION:When a gas leak alarm detects, excitation, erasing the plunger absorption magnetic force of a permanent magnet 9, is energized to an electromagnetic coil 10, a plunger 8 is lowered to depress a main valve 6 to a closing position, and a gas passage is shut off to stop the flow of gas. Reset for using the gas is such that energization is shifted so that the electromagnetic coil produces excitation by dint of which the plunger 8 is lifted up, and the plunger under upward movement absorbs an auxiliary valve 7 through the magnetic force of the electromagnetic coil to lift the auxiliary valve to an opening position. Release of a passage 14 for reset causes gas on the primary side to flow to the secondary side, forces the main valve 6 to be raised to an opening position through the push-up force of a spring 11, and this enables the use of gas.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application This invention automatically shuts off the gas passage to prevent gas release when a gas leak occurs, and also prevents the gas from being released downstream when the gas supply is resumed. If the cause of the leak has not been resolved,
This relates to a gas safety device that makes it impossible to restart the gas supply.

(2) Conventional technology Since the occurrence of scum leakage can lead to personal injury, research and development has been progressing in recent years on scum safety devices that automatically cut off the gas supply if a gas leak occurs.

The currently proposed scum safety device incorporates a cutoff valve linked to a scum leakage alarm in the middle of the gas piping, and when the alarm detects scum leakage, the shutoff valve operates to stop the gas from flowing out and supply scum. Resetting the shutoff valve to restart the
This is done by detecting the secondary pressure caused by the tire flam, and the reset operation is configured to manually move an operating section provided on the shutoff valve.

However, the use of a diaphragm for a shutoff valve has problems with durability, and since the reset operation part penetrates the valve box of the shutoff valve, there are concerns about the sealing structure against gas leakage, and furthermore, the operation part However, depending on the mounting position of the shutoff valve, there is a problem that operation becomes inconvenient.

(3) Problems to be Solved by the Invention Therefore, the present invention eliminates the use of a diaphragm in a shutoff valve, allows the reset operation to be performed from any position, and eliminates the occurrence of internal and external penetrations into the valve body. This is a problem.

(4) Means for Solving the Problems In order to solve the above problems, the present invention is installed in the middle of the waste passage in a vertically movable manner, blocks the passage at the lowered position, and rises to the open position. a main valve that is elastically biased; a magnetic plunger that is provided directly above the main valve and is movable up and down to release the main valve in a raised position and press the living valve to a closed position when lowered; a permanent magnet that is placed directly above the magnetic plunger and attracts and holds the plunger in the raised position;
an electromagnetic coil disposed outside the magnetic plunger and capable of switching between excitation to pull the plunger in the raised position away from the permanent magnet and lower it and excitation to pull the plunger in the lowered position to the raised position; and the main valve. Open and close the reset passage provided in the The sub-valve is arranged on the main valve so that it can move up and down.The sub-valve is also made of magnetic material, and is moved to the valve open position via the plunger by the excitation force that raises the plunger of the electromagnetic coil. It was designed to be lifted up.

(5) When no leakage of working scum occurs, the plunger is in the raised position and held by a permanent magnet, and the main valve is pushed up to the open position, opening the valve hole of the scum passage, and removing the scum. It is available for use.

When a waste leak occurs and this is detected by a waste leak alarm,
The electromagnetic coil is energized to energize the permanent magnet, which cancels out the plunger's magnetic absorption force, and the plunger descends , , , i □i ′ , pushes the main valve to the closed position, blocks the waste passage, and removes the waste. Stop the leak.

The reset for using gas is done by the force of the electromagnetic coil) The energization is switched to excite the plunger to pull it up, and the rising plunger uses the magnetic force of the electromagnetic coil to electromagnetize the auxiliary valve and pull it to the valve open position.

The main valve maintains the closed position due to the difference between the primary pressure and the secondary pressure, but as the reset passage opens due to the rising of the auxiliary valve, the waste on the primary side flows to the secondary side, and the -correction and secondary pressure When balanced, the main valve is raised to the open position by the force of the spring, allowing gas to be used.

If the cause of the waste leakage is not resolved at the time of reset, the pressure on the secondary side will increase, the main valve will remain in the closed position, and the main valve will be pulled up via the plunger due to power cut to the electromagnetic coil. The auxiliary valve, which had been closed, lowers to the closed position under its own weight, closing the reset passage and stopping the outflow of waste.

(5) Examples Examples of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show different operating states of the gas cutoff valve, FIG. 7 shows a specific assembly structure of the cutoff valve, and FIG. 8 shows a circuit diagram of the entire gas drafting device.

The gas cutoff valve 1 has a valve hole 5 inside a valve box 2 that divides the gas passage into a primary passage 3 and a secondary passage 4, and a main valve 6, a sub-valve 7, and a magnetic planar plate directly above the valve hole 5. A plunger B, a permanent magnet 9, etc. are incorporated, and an electromagnetic coil 10 is installed outside the plunger 8.
It is formed by arranging.

The main valve 6 is given elasticity by the spring 11 to normally rise to the open position, and is lowered to the closed position so as to contact the valve seat 12, thereby blocking both passages 3 and 4.

The main valve 6 has a recessed part 13 on the upper surface and a "1" recessed part in the center part.
A reset passage 14 extending downward is provided, and the auxiliary valve 7
is arranged directly above the main valve 6 so as to be able to move up and down, and the recessed portion 1
The reset passage 141 is connected to the lower surface of the head 7a that fits within the head 7a, and the shaft portion 7a that loosely fits into the reset passage 141 is connected to the lower surface of the head 7a.
It is formed by attaching C.

Note that the sub-valve 7 is formed using a magnetic material.

When the auxiliary valve 7 is in the open position raised relative to the main valve 6, the reset passage 14 is opened, and the negative side gas flows out to the secondary side passage 4 through the gap with the shaft part. It looks like this. (See Fig. 3) Also, when the sub valve 7 is in the closed position where it is lowered relative to the main valve 6, the seal 7C on the head is closed to the main valve 6.
overlaps the upper surface of the reset passage 14 and blocks the reset passage 14. (See Fig. 2) The magnetic plunger 8 is housed and held in a cylindrical portion 15 provided so as to protrude upward from the upper wall 2a of the valve box 2 so as to be movable up and down. It faces directly above valve 7.

A permanent magnet 9 and a magnetic material 16 are incorporated in the upper end of the cylindrical portion 15, and a plunger 8 is placed in the raised position.
is attracted and held by the magnetic force of the permanent magnet 9.

When the plunger 8 is in the raised position, the entire length of the cylindrical portion 1
5, and the vertical dimensions are set so that its lower end is flush with or slightly above the lower surface of the valve box upper wall 23. (See Fig. 1) Furthermore, when the plunger 8 is in the lowered position separated from the permanent magnet 9, it rests on the main valve 6 via the auxiliary valve 7, compresses the spring 11 with its weight, and The electromagnetic coil 10 is adapted to hold each of the valve 6 and the sub-valve 7 in the closed position (see FIG. 2), and the electromagnetic coil 10 surrounds the plunger 8 via the cylindrical portion 1b, and It gives vertical movement to the plunger 8, and there is an excitation to pull the plunger 8 electromagnetized by the permanent magnet 9 away from the permanent magnet 9 and lower it, and an excitation to pull the plunger 8 from the lowered position to the raised position. It is now possible to switch to.

Figures 5 and 6 show an example of electrically detecting the open/closed state of the main valve 6 from outside the valve body 2. A magnet 1B is installed, and a main valve opening/closing detection switch 19 which opens and closes by magnetic force is placed on the face of the valve box 2 directly under the permanent magnet 18.

The switch 1 is an example of a structure using a reed switch as shown in Fig. 5 or a movable body as shown in Fig. 6. When the main valve 6 is in the raised valve opening position flH,
The permanent magnet 18 moves away from the switch 19, and its magnetic force does not act on it, so the contact of the switch 19 becomes open. (See Figure 5) When the main valve 6 is in the lowered closed position, the permanent magnet 1B approaches the switch 191, and its magnetic force causes the switch to
Contact point 9 is in a closed state. (See Figure 6) In the electric circuit shown in Figure 8, the gas leak alarm 20 and manual switch 21 are connected in series between the power supplies and the electromagnetic coil 10 in the cutoff valve 11, and these are connected in parallel. The main valve open/close switch 19, the reset switch 22, and the delay relay l'R are connected in series between the power supplies, and the relay and timer relay T are connected between the main valve open/close switch 19, the reset switch, and one power supply. are included in parallel.

The operation of the shutoff valve will be briefly explained with reference to the circuit diagram shown in FIG.

When there is no gas leak, as shown in Figure 1, the plunger B is held by the permanent magnet 9 and is in the raised position, and the main valve 6 is pushed up by the spring 11 and is in the open position. .

If a gas leak occurs in this state, the contacts of the alarm 20 close, and the electromagnetic coil 10 is energized via the b contacts TRb and TRb of the delay relay 1"R. At this time, the electromagnetic coil 10
is excited so as to cancel the magnetic force of the permanent magnet 9, and the plunger 8 descends to push down the gas valve 7 and the main valve 6, thereby blocking the gas passage as shown in FIG.

Next, to reset the shutoff valve 1 to the open state in order to use gas, press the reset switch 22 with your fingertip.

The open/close detection switch 19 of the main valve 6 detects the closed state of the main valve 6 and is closed, so the reset switch z2
When the third contact 22C of is closed, the timer switch IS
The relay k is energized via the relay k, each of the two contacts Ra of the relay 1 are closed, the delay relay Tlt is energized, and the relay is self-holding.

By energizing delay relay "l", l) contact TRb.

'i Rl) or open, simultaneous +Ca contact i'a a,
When l'Ra closes, the direction of the current to the electromagnetic coil 10 is switched, so that the electromagnetic coil 10 is energized to pull up the plunger 8, and the plunger 8 rises and is held by the permanent magnet 9.

When the plunger 8 is lifted, the sub-valve 7 in contact with the lower end surface is pulled up from the main valve 6 to the open position by the magnetic force, and the reset passage 14 is opened, so that the gas on the negative side flows into the secondary It flows out into the side passage 4. (Refer to Figure 3) (I) When the cause of the gas leak has been resolved. In this case, the gas does not flow out of the reset passage 14 slightly, but the gas pressure in the secondary passage 4 increases, and the gas pressure against the main valve 6 increases. The gas pressures in the primary passage 3 and secondary passage 4 become equal, and the spring 1
The main valve 6 is raised to the valve open position by the push-up blade 1, and the valve hole 5 is opened to allow gas to be supplied. (Situation shown in Figure 1) When the main valve rises to the open position, the main valve open/close detection switch 19 becomes open, the delay relay rR and the relays are de-energized, and the contacts of each relay Switch, 8th
The circuit returns to the state shown in the figure and prepares for the next gas leak detection.

(■) If the cause of the gas leak is not turned off, the plunger 8 and the sub-valve 7 will be removed even if you press the reset switch 22 while leaving the cause of the gas leak as is.
rises, opens the reset passage 14, and opens the secondary passage 4.
However, due to the gas leakage, the gas pressure in the secondary passage 4 does not increase, and the main valve 6 remains in the closed position due to the difference in gas pressure.

When the relay is energized by pressing the reset switch 2, the timer T is activated, and the time required for the gas flowing out from the reset passage 14 to increase the gas pressure in the secondary passage 4 is set in advance. When a time slightly longer than the time has elapsed, the timer switch I's installed in series with the relay k opens, cutting off the power to the relay and opening each contact Ra.

Therefore, as the delay relay "l" is de-energized, the electromagnetic coil 10 is de-energized, and the plunger d8,j
The raised position of 11゛ is held only by the magnetic force of the permanent magnet 9, and the magnetic force that grips the sub-valve 7 at the lower end disappears, so the sub-valve 7 descends by its own weight and opens into the reset passage as shown in Fig. 4. 14 to stop the gas from flowing out.

As described above, if the cause of gas leakage is not eliminated, even if the reset switch 22 is pressed, only a small amount of gas will flow out, making the supply of gas impossible.

(2) If the cause of the gas leak is eliminated after the reset is impossible, both the main valve 6 and the sub-valve 7 are in the closed position, as shown in Figure 4.
When the reset switch 22 is pressed after eliminating the cause of the gas leak with the plunger 8 in the raised position, the first contact 22a closes, the electromagnetic coil IL is energized, and the plunger 8 descends. 2, with its lower end resting on the sub-valve 7.

At this time, when the third contact 22C of the reset switch 22 is closed and each contact Ra is closed by energizing the relay, the relay is self-retained.

Release the pressure on the reset switch 22 and open the second contact 22b.
When it closes, the a contact TRa and the b contact TRb of the delay relay IT R switch to energize the electromagnetic coil 10, and the plunger 8 absorbs sulfur from the auxiliary valve 7 and rises as shown in FIG. The reset passage 14 is opened to increase the pressure in the secondary passage 4, after which the main valve 6 is brought to the open position as shown in FIG. 1, and gas can be supplied.

(7) Effects As described above, since the present invention has the above-described configuration, it has the following effects.

faj The plunger that operates the main valve and auxiliary valve to open and close positions is moved up and down using a permanent magnet and electromagnetic force, so the operating position can be set freely by resetting or electrically remote control.

(1)) It is possible to omit the use of a tire flam to increase the secondary side pressure, and the durability of the shutoff valve can be greatly improved.

Since the tC+a disconnection operation and reset operation only require switching the energization to the electromagnetic coil, the operation circuit becomes simple.

(d) It is safe because there is no need to worry about gas leakage because there is no part that penetrates the valve box in or out.

(e) The electromagnetic coil only needs to be energized when shutting off and resetting, which is safe and economical.

(f) By interlocking with a gas alarm, the outflow of gas can be shut off as soon as a gas leak occurs, so the safety of gas use can be improved.

(g) The valve can be opened and closed simply by turning the switch on and off, so it can also be used as a main cock. (h) This can be done only after restarting the gas supply or eliminating the cause of the gas leak, which greatly improves safety. improve.

[Brief explanation of the drawing]

Each of FIGS. 1 to 6 is a longitudinal sectional view showing different operating states of the gas cutoff valve, FIG. 7 is a longitudinal sectional view showing a specific assembly structure of the cutoff valve, and FIG. 8 is the same as above. It is a circuit diagram of a safety device. 1 1 is a shutoff valve, 2 is a valve box, 3 is a primary side passage, 4 is a secondary side passage, 6 is a main valve, 7 is a sub-valve, d is a plunger, 9 is a permanent magnet, 1o is an electromagnetic coil, 11 12 is a valve seat, 14 is a reset passage, 20 is a gas alarm, and 22 is a reset switch. Patent applicant: Minato Seisakusho Co., Ltd. Agent: Kama 1) Text 2.1.1 (・

Claims (1)

[Claims] A main valve is installed in the middle of the gas passage so as to be able to move up and down, and is elastically biased to block the passage in the lowered position and rise to the open position. a magnetic plunger that releases the main valve in the raised position and presses the main valve to the closed position when lowered; a permanent magnet that is placed directly above the magnetic plunger and attracts and holds the plunger in the raised position; An electromagnetic coil is arranged on the outside and can switch between excitation to pull the plunger in the raised position away from the permanent magnet and lower it, and excitation to pull the plunger in the lowered position to the raised position, and a reset coil provided on the main valve. It consists of a sub-valve that is movable up and down on the main valve to open and close the passage, and the sub-valve is made of magnetic material.
A gas safety device in which the plunger of an electromagnetic coil is pulled up to the open position by the excitation force that lifts the plunger.