JPS6364675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solenoid valve used for controlling gas or other fluids.

(Prior art) A conventional solenoid valve, which is commonly used in this type of valve, has a magnetic circuit composed of an excitation coil, a yoke, and a plunger, and is constantly energized to cause the valve body provided on the plunger to close when the valve closes. resists force and adsorbs,
By keeping the valve open and not energizing it, it no longer functions as an electromagnetic coil, and the plunger is pushed by the force of the valve closing spring to press against the valve seat and close the valve.

Therefore, in order to keep the valve open at all times, it is necessary to continuously energize the excitation coil, and for this reason, there are restrictions such as the effect of heat generation in the excitation coil and the current value and coil dimensions that are commensurate with the allowable temperature rise of the coil. Yes, it always consumes a certain amount of electricity to keep the valve open, and the valve closes unconditionally during a power outage, so it is necessary to secure a safety power supply if necessary, and it will automatically close when the power is turned on again. There are problems such as the valve opening and causing danger.
In addition, a solenoid valve that is not energized all the time but is energized only when it is activated is, for example, as disclosed in Japanese Utility Model Publication No. 15420/1983, which has a yoke whose lower end is fixed to a bottom plate made of a magnetic material such as iron, and whose upper end is fixed by inserting a permanent magnet. An electromagnet with an electromagnetic wire wound around the outside of a guide tube fixed to the valve is airtightly attached to the valve body that opens the inlet and outlet, and the guide tube of the electromagnetic port has its tip connected to the outlet of the valve body. ``A solenoid valve consisting of a movable iron core equipped with a valve that opens and closes the outlet opening with a compression spring inserted between it and a permanent magnet so that it can move up and down,'' and the Utility Model Publication No. 55-31330.
``In a valve body that opens and closes the valve by a movable core, there is a permanent magnet for holding a magnetic closed circuit formed by adsorption between the movable core and the fixed core, and a permanent magnet that is oriented in the opposite direction to the permanent magnet when energized. A self-holding electromagnetic operating section has a coil that generates a magnetic flux, and a manual button for returning the movable core to the position where it is attracted to the fixed core protrudes from the outside of the valve body. A spring is provided to urge the two cores to release from the attraction, and magnetic flux in the opposite direction to the permanent magnet generated by energizing the coil causes the attraction force of the two attracted iron cores to be lower than the load force of the spring. There is a known solenoid valve device in which the detached cores are set apart and the magnetic resistance increases due to the separation of the two cores, making it impossible for the two cores to be attracted by energization.

(Problems to be Solved by the Invention) All of the above are unsuitable as valves for gas, etc. In other words, if substances contained in the gas adhere and gaps are created in the adsorption part. Its adsorption force was drastically reduced, and each sliding part also produced large resistance, resulting in a lack of durability. This was due to gas entering the attracting surface and sliding parts, and although permanent magnets and excitation coils are used, the magnetic field configuration of both works to reduce the magnetic force of the permanent magnets, which is preferable. It wasn't.

(Means for Solving the Problems) The present invention concentrically inserts a plunger, which connects a valve closing spring, a valve seat, and a shaft, into an electromagnetic operating chamber that includes a permanent magnet and an excitation coil via a yoke. The shaft penetrates through the electromagnetic actuating chamber and has an external manual knob, and is also provided with isolation means such as a diaphragm to prevent gas flow between the gas passage through the valve seat and the electromagnetic actuating chamber. Further, a flat surface and a tapered surface are formed at the connecting portion of the plunger connected to the shaft, and a suction surface corresponding to the flat surface and tapered surface is formed on the yoke at a corresponding position, and the excitation The coil is connected to a valve opening circuit and a valve closing circuit, each having a capacitor, which can be selectively activated by remote control or the like.

(Function) The present invention provides a solenoid valve which is used for controlling gas or other fluids and which can maintain a valve open or closed state at all times without energizing an excitation coil. In addition to preventing fluids such as gas from entering the valve, the attraction force of the permanent magnet increases the ability to maintain the valve open, and even in abnormal situations such as power outages, the valve can be maintained in the open or closed state at that time. It is characterized by this.

(Example) Next, an example of the present invention shown in the drawings will be described in detail.

There is a valve body 1 that forms a fluid passage, a nozzle 2 provided on the valve body 1, a valve rubber 3 and a valve seat 4 that supports the valve rubber 3 to freely open and close the nozzle 2. There is.

Further, an outer shell 6 surrounding the electromagnetic operating chamber 5 and the valve body 1
In order to prevent fluid from entering the electromagnetic working chamber 5, an O-link is provided on the diaphragm 7, which is a thin rubber film, or on the plunger 9, etc., to block the electromagnetic working chamber and the gas passage. Isolation means are provided to prevent gas from entering the electromagnetic actuation chamber. In addition, a plunger 9 is attached to the permanent magnet in the electromagnetic operation chamber 5.
It has a yoke 10, an excitation coil 11, and a permanent magnet 12 surrounded by the yoke 10, a guide tube 13, and a non-magnetic bottom plate 19. A magnetic circuit of this magnet 12 is configured, and the yoke 10 and the outer It is fixed to the shell 6 with screws 8. A plunger 9 is inserted into the guide tube 13, and a spring 1 is inserted between the plunger 9 and the yoke 10.
4 is compressed and the plunger 9 is inserted into the guide tube 13 by the maximum amount, the magnetic circuit is closed and the permanent magnet 1
The plunger 9 is attracted by the magnetic force b of 2, which overcomes the force of the spring 14.

One side of the plunger 9 is connected to the valve seat 4 and the diaphragm 7 with a screw 15, and the other side is connected to a shaft 9' that passes through a hole 10' in a yoke 10 of the magnetic circuit. A flat surface 9a and a tapered surface 9b are formed on the end surface of the plunger 9, and a manual knob 16 is attached to the end of the shaft 9' projecting from the electromagnetic operation chamber 5.

The state shown in FIG. 1 is the valve open state, and the flat surface 9a and taper 9b correspond to the corresponding yoke 1.
0, the magnetic force b of the permanent magnet 12 acts on the plunger 9 during the magnetic circuit, overcomes the force of the spring 14, and the plunger 9
While the is adsorbed to the yoke 10 as described above,
By instantaneously applying a direct current in the direction of canceling the magnetic force b of the permanent magnet 12 in the magnetic circuit to the excitation coil 11, a magnetic force a is generated, and the magnetic force b of the permanent magnet 12 momentarily stops acting on the plunger 9, causing the spring 1
4, the plunger 9 separates from the yoke 10, and the valve seat 4 and valve rubber 3, which move together with the plunger 9, block the nozzle 2 and close the valve. When the plunger 9 separates from the yoke 10 by more than a certain distance, the magnetic circuit becomes an open circuit and the magnetic force b of the permanent magnet 12 is diffused, so the attraction force acting on the plunger 9 disappears and the valve is kept closed by the force of the spring 14. do.

Next, a magnetic force in the same direction as the magnetic force b of the permanent magnet 12
By momentarily applying a direct current to the exciting coil in the direction in which a' is generated, that is, in the opposite direction to the above, magnetic force a' is generated in the magnetic circuit, and the plunger 9 is moved to the yoke 10.
By attracting it to the yoke 10 and adsorbing it to the yoke 10, the distance between the yoke 10 and the plunger 9 is reduced.
Even when the magnetic circuit becomes a closed circuit and the current is no longer energized, the magnetic force b of the permanent magnet 12 attracts and holds the yoke 10 and the plunger 9, and the valve seat 4 and valve rubber 3, which move together with the plunger 9, separate from the nozzle 2 and close the valve. Keep it open.

To manually change the valve from the open state to the closed state, use manual force to push the manual knob 16 connected to the plunger 9 by the shaft 9' in a direction that separates the yoke 10 and the plunger 9, and the permanent magnet 12 Apply force to overcome the attraction force of the permanent magnet 12 and release it, open the magnetic circuit, diffuse the magnetic force b of the permanent magnet 12, eliminate the attraction force acting on the plunger 9, and release the spring 14.
Due to the force, the valve rubber 3 and valve seat 4, which are integrated with the plunger 9, block the nozzle 2, and even after releasing the hand, the spring 1
4 force keeps the valve closed. Conversely, to manually change the valve from the closed state to the open state, use manual knob 1.
A tensile force is applied to the yoke 6 in the direction of bringing the yoke 10 and the plunger 9 closer to each other, overcoming the force of the spring 14, and pulling the yoke 10 and the plunger 9 closer to each other. The magnetic force b is concentrated on the plunger 9, and the plunger 9 is attracted to the yoke 10 by the magnetic force b of the permanent magnet 12.
The valve rubber 3 integrated with the plunger 9 and the valve seat 4 are separated from the nozzle 2 to keep the valve open, and the valve remains open even after the hand is released.

An example of an electrical wiring diagram that operates in this manner is shown in FIG. In this figure, a valve closing switch SW ₁ and a valve opening switch SW ₂ are connected in series from a power source S, and are further divided into a valve opening circuit A and a valve closing circuit B, and the valve opening circuit A is used for opening the valve. capacitor C ₁ and in parallel with this
The connection order of NO switch OS and NC switch CS,
One set each of this reverse connection, and one set each of the same connection order and the reverse connection order as described above are connected in the valve closing circuit B in parallel with the valve closing capacitor _C2 , and the intermediate between these sets Connect to the excitation coil 11 from the point. Therefore, the OS on one side of the circuit A bordering on the midpoint of the circuits A and B, and the CS on the circuit B, as well as the CS and OS and the valve opening operation switch SW ₂ , are interlocked, and the CS on the one side and the CS on the same side are linked.
OS, OS and CS on the other side, and valve closing switch
Configure it so that SW _{1 and SW 1} interlock with each other.

Therefore, when the valve closing switch SW ₁ is opened, the power supply circuit S is disconnected and the discharge current of the valve closing capacitor C ₂ flows into the valve closing circuit B, as shown by the one-dot chain line. a′ or permanent magnet 1
A magnetic force a' in the opposite direction to the magnetic force b of 2 acts on the plunger 9 to weaken the magnetic force b of the permanent magnet 12, and the spring 14
The valve rubber 3 closes the nozzle 2 with the accumulated force. Then,
As the plunger 9 moves (see the chain line in FIG. 1), the yoke 10 and the plunger 9 form an open magnetic path and maintain the valve closing action.

Next, for the valve opening action, when the valve opening operation switch SW ₂ is turned off, the valve opening capacitor C ₁ of the valve opening circuit A is discharged as shown by the magnetic force a in the direction of the solid line arrow, and the electromagnet 12
A strong magnetic force a in the same direction as the magnetic force b is generated, which attracts the plunger 9 in the closed valve state and causes the valve rubber 3 to open the plunger 2. After the valve is opened, the magnetic force a disappears, but the magnetic force b of the permanent magnet 12 maintains the valve open state.

To open and close the valve manually, remove the cap 18 with the transparent window 17 and turn the manual knob 1.
6 is pushed down, the valve is closed against the magnetic force b of the permanent magnet 12, the valve is kept closed in the same manner as described above, and to open the valve, the manual knob is pulled up to open the valve against the stored force of the spring 14. , the valve is kept open by the magnetic force b of the permanent magnet 12. The transparent window 17 is provided so that when the manual knob (colored red or the like) is visible, it is possible to know when the valve is closed.

The above example has one NO switch and one NC switch.
The configuration of the set is described, but both valve open and valve closed circuits A,
Four NO switches (OS only) are arranged for each of B, and each is connected to the excitation coil 11 from the middle point, and the valve-closing and valve-opening switches SW ₁ and SW ₂ are separated by the center point. One side of valve opening circuit A
NO switch OS, NO switch OS on the other side of valve closing circuit B, NO switch OS on the other side of valve opening circuit A, and NO switch OS on one side of valve closing circuit B.
may be linked to each other. However, with this simple structure, there is only one switch SW ₁ for closing and opening the valve.
If SW ₂ and SW 2 are activated at the same time, there is a drawback that a shoot will occur, but if there is no danger of simultaneous activation, the effects of the present invention can be obtained.

(Effects of the Invention) As described above, the present invention has a simple structure that allows the valve to be opened and closed from a remote location using electricity, and the valve can be switched from the valve open to the valve closed or from the valve closed to the valve open by instantaneous energization. In solenoid valves that can be configured with an electric circuit to open and close the valve without requiring electricity to keep the valve open or closed, foreign matter in the fluid may enter the solenoid operating chamber and adhere to the suction surface, etc. Without any
There is little demagnetization of the permanent magnet, manual operation is possible during power outages, and a relatively strong spring for closing the valve is used, making it highly safe.If the valve has a simple structure, the unit price will be low. , installed in the middle of gas piping such as LP gas in general households, especially outdoors, so that the gas opening and closing can be controlled from indoors, and the valve can be closed when you are not home or late at night to prevent gas leak accidents indoors. When using gas, double safety can be ensured by installing an electric circuit that works in conjunction with a gas leak alarm and issues an electrical command to close the valve when an alarm is issued.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention;
FIG. 2 is a circuit diagram showing one example of electrical connections. 2 is a nozzle, 3 is a rubber valve, 5 is an electromagnetic operating chamber, 9 is a plunger, 10 is a yoke, 11 is an exciting coil, 12 is a permanent magnet, 13 is a guide tube, 14 is a spring, and 16 is a manual knob.

Claims (1)

[Claims] 1. A plunger, which connects a valve closing spring, a valve seat, and a shaft, is inserted concentrically into an electromagnetic operating chamber that includes a permanent magnet and an excitation coil via a yoke.
The shaft has a manual knob on the outside passing through the electromagnetic actuation chamber, and is provided with isolation means such as a diaphragm to prevent gas flow between the gas passage through the valve seat and the electromagnetic actuation chamber. A flat surface and a tapered surface are formed at the connecting part of the plunger connected to the shaft, and a suction surface corresponding to the flat surface and tapered surface is formed on the yoke at the corresponding position, so that both flat surfaces are permanently attached. The magnetic holding force of the magnet is effectively obtained by the magnetic flux generated by the excitation coil on the tapered surface, and the attraction force is effectively obtained, and the excitation coil has a valve opening circuit and a valve closing circuit that can be selectively operated by remote control or the like. and a solenoid valve connected to each with a capacitor.