JPH05196166A - Automatic directional control solenoid valve - Google Patents

Abstract

PURPOSE:To miniaturize a directional control valve and to simplify its mechanism by furnishing a valve part forming a first flow passage in the energizing direction by a spring and second and third flow passages so as to be roughly orthogonal with this direction and a plunger with flow passages to correspond with these flow passages respectively. CONSTITUTION:It is furnished with a coil 10 of a solenoid valve 18 to carry out demagnetization or magnetization in accordance with a signal from a pressure switch 25 and a spring 12 fastened on one end of a core 9 arranged in the coil 10 and fastened on a plunger 11 on the other end. A valve part 2 has a first flow passage 7 formed in the energizing direction by the spring 12 and a second flow passage 3 and a third flow passage 5 formed to be roughly orthogonal with this direction. Furthermore, in accordance with impulsive motion of the plunger 11, the flow passage formed on the valve part 2 is blocked or communicated through. Consequently, it is possible to fully-automate and precisely carry out directional control motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic switching solenoid valve,
Especially for the LPG supply equipment, an automatic switching solenoid valve for switching between the use side and the spare side of the LPG container group due to gas consumption, and the LPG against abnormal situations such as abnormal temperature, abnormal pressure and gas leakage along with this switching. The present invention relates to an automatic switching solenoid valve for automatically stopping the supply of water.

[0002]

2. Description of the Related Art The LPG filled in a container has a liquid temperature,
It has a certain pressure depending on the gas quality. The composition of the liquid changes as the gas is consumed, the quality of the gas changes, and if the latent heat of vaporization is not sufficiently replenished from the outside, the temperature of the liquid drops due to the heat being taken from the liquid itself, and the pressure inside the container Gradually decreases.

Conventionally, in order to cope with such a phenomenon inside the container, as shown in FIG. 9, the use side 19 and the spare side 21 of the LPG container group equipped with LPG supply equipment and a plurality of cylinders are gas-consuming. A switching valve 32 for switching is installed.

As such a switching valve, a mechanical anti-automatic switching valve 32 shown in FIG. 11 is conventionally known. This mechanical anti-automatic switching valve 32 includes a ball valve 33, a weight 34, and a spring, and the force of the weight 34 and the spring is used at the switching set pressure due to the pressure drop of the container on the use side to use the container on the use side. The ball valve 33 switches the flow path from the container to the spare container. After replacing the container, the weight 34 and the spring are always reset manually.

However, in this mechanical anti-automatic switching valve 32, the size of the switching valve becomes large, and it takes time and effort to reset, and if the reset is forgotten, the switching valve cannot switch the flow path.

As a switching valve, a mechanical fully automatic switching valve 40 shown in FIG. 12 is known. The mechanical fully automatic switching valve 40 is, for example, the ring valve 4 on the container side 41a on the use side.
When 2 is opened, the liquid pressure of the LPG raises the diaphragm 44 integrated with the operating rod 43, the piston 45 moves in the A direction, and the piston on the right side of the operating rod 43 is in the operating rod 43. Enter the hole and lock on. When the LPG on the container side 41 on the use side is used up in this state, the pressure under the right pressure sensing surface 46 and the diaphragm 44 decreases, and when the switching pressure reaches the set value, the load of the spring 47 of the diaphragm 44 is applied to the diaphragm 44. And the operating lever 43 pushes the piston pin 48 downward, allowing the piston 45 to move freely. As a result, the left side pressure is larger than the right side pressure, so that the piston 45 moves in the B direction, the left side ring valve 49 opens, and the LPG of the reserve side container 41b flows in the C direction.

However, this mechanical fully automatic switching valve 40 is
A pressure difference is required for switching, the switching valve is large in shape, and the mechanical mechanism is complicated, so that a failure is likely to occur.

As a switching valve, the 3-port direct acting solenoid valve 50 shown in FIG. 13 is also known. The 3-port direct-acting solenoid valve 50 includes a core 51, a coil 52, a valve 53, and a plunger 54. When the coil 52 is energized, the valve 53 closes the flow passage 55 on the reserve side to prevent the flow on the LPG supply side. The path 56 and the flow path 57 on the use side communicate with each other. When the coil 52 is not energized, as shown in FIG. 14, the flow path 55 on the backup LPG supply side and the flow path 56 on the supply side are communicated with each other.

However, this 3-port direct acting solenoid valve 50
Has a small maximum working pressure of 7 kg / cm2 and a small orifice of Φ2.3, the flow rate of LPG is small and the structure is complicated.

Further, when an abnormal situation such as an abnormal temperature, an abnormal pressure or a gas leak occurs, conventionally, as shown in FIG.
On the basis of a signal from the detector 33 that detects an abnormal situation, the shutoff valve 60 installed in the middle of the pipe 24 is operated to stop the supply of LPG from the pipe 24.
Therefore, in addition to the switching valve for switching between the container on the use side and the container on the spare side, it is necessary to separately install two shutoff valves 60 in case of an abnormal situation.

[0011]

As described above, in the conventional switching solenoid valve, the shape of the switching valve is large, the mechanism and structure are complicated, and moreover, manpower is required for operation and the flow rate must be small. There were problems such as not being able to. Further, there is a disadvantage that the switching valve and the shutoff valve are separately installed.

A first object of the present invention is to solve the above-mentioned conventional problems, to make the switching valve small, to have a simple mechanism and structure,
Moreover, it is an object of the present invention to provide an automatic switching solenoid valve capable of achieving a large flow rate without requiring manual operation.

A second object of the present invention is to provide an automatic switching solenoid valve which can achieve the above-mentioned first object and which has the functions of both a switching valve and a shutoff valve.

[0014]

The first object of the present invention is to:
A coil that performs demagnetization or excitation based on a signal from the pressure switch, a spring that is fixed to one end of a core disposed inside the coil and the other end is fixed to a plunger, and a biasing direction by the spring. A first flow path formed in the first flow path and a valve section that is substantially orthogonal to the urging direction and has a second flow path and a third flow path formed at intervals in the direction; A plunger that is slidably disposed in the valve portion and has flow passages formed in directions corresponding to the first, second, and third flow passages, respectively. This is achieved by closing or connecting the flow path formed in the valve portion.

A second object of the present invention is to fix the coil, which is demagnetized or excited based on the signal from the detector for detecting an abnormal situation, and the core arranged in the coil, together with the above-mentioned structure. This is achieved by providing a shutoff valve provided at the tip of a shaft provided in the plunger so as to be movable along the sliding direction.

[0016]

When the coil is demagnetized, the plunger is pushed out by the urging force of the spring, and one of the flow passages corresponding to the second and third flow passages formed in the plunger, for example, , The flow path connected to the use-side container communicates with the first flow path, while the flow path connected to the spare-side container is blocked. When the coil is excited, the force of the spring is pressed to the core side, and the flow passage corresponds to any of the flow passages corresponding to the second and third flow passages formed in the plunger, for example, the spare side. The flow path connected to the container is in communication with the first flow path, while the flow path connected to the use-side container is blocked.

In the normal state, the coil of the shutoff valve is excited, and the first valve formed on the plunger is attracted to the core.
In the case of an abnormal situation, the coil of the shutoff valve is demagnetized, so that the first passage of the plunger is shut off by the biasing force of the spring.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of an automatic switching solenoid valve of the present invention, showing a demagnetized state, and FIG. 2 shows an excited state. 3 is a schematic external view of the automatic switching solenoid valve of the present invention.

As shown in FIG. 3, this automatic switching solenoid valve includes an electromagnetic coil box 1 having a coil, a core, a spring, etc., and a valve section 2 having a plunger, a tool, a body, etc.
And disposed in one direction (right side) from the valve portion 2, and the flow path 3
An inlet flange 4 communicating with the flow path 5, and an inlet flange 6 disposed in the other direction (left side) from the valve portion 2 and communicating with the flow path 5,
An outlet flange 8 is provided which communicates with the flow path 7 disposed below the valve portion 2.

As shown in FIG. 1, the solenoid valve box 1 has a circular recess formed in the center thereof. A core 9 is disposed on the upper side of the recess, and a coil 10 is provided around the core 9. Is provided. Further, recesses communicating with the recesses formed in the solenoid valve box 1 are also formed on the valve portion 2 side, and the plunger 11 is slidably provided in these recesses. A circular recess is formed in the upper portion of the plunger 11, one end of the spring 12 is mounted on the bottom of this recess, and the other end of the spring 12 is mounted on the bottom of the core 9.

A tool 13 consisting of an O-ring is provided in the valve section 2 near the electromagnetic box 1 and the valve section 2,
Further, a flow path 3 communicating with an LPG container (use side container) not shown in FIG. 1 is formed in the valve portion 2 and communicates with an LPG container (spare side container) not shown in FIG. A flow channel 5 is formed, and a flow channel 7 communicating with a paper riser (not shown in FIG. 1) is also formed.

Therefore, the plunger 11 is formed with flow passages 11a, 11b and 11c which can communicate with the respective flow passages 3, 5 and 7 as the plunger 11 operates. Then, tools 15 and 16 made of O-rings are provided on both sides in the axial direction of the plunger 11 with respect to the flow paths 11a and 11b formed in the plunger 11, and the valve portion 2 is provided.
A tool 17 formed of an O-ring is provided on the side.

As shown in FIG. 5, the solenoid valve 18 having such a structure is connected to the pipe 20 in which the flow path 3 of the valve portion 2 is connected to each container of the use side container 19 and the flow of the valve portion 2 is connected. The passage 4 is connected to a pipe 22 connected to each container of the spare side container 21, and the flow passage 14 of the valve portion 2 is connected to a pipe 24 connected to a vaporizer 23.

A pressure switch 25 is provided in the middle of the pipe 24, and the coil 10 provided in the solenoid valve 18 is excited and demagnetized on the basis of a signal from the pressure switch 25.

Next, the operation of the above embodiment will be described. The LPG filled in the container has a predetermined pressure depending on its liquid temperature, gas quality and the like. When the liquid amount decreases as the gas is consumed and the LPG liquid becomes small, the LPG liquid changes to LPG gas in the container. Further, if the latent heat of vaporization is not sufficiently supplied from the outside, the pressure in the container gradually decreases due to a phenomenon such that the temperature of the liquid decreases because heat is taken from the liquid itself.

When the vapor pressure in the container sharply drops, gas is cut off, so that the container is accurately switched to the spare container. Such a switching operation will be described.

FIG. 1 shows a state in which LPG is supplied from the container 19 on the use side through the solenoid valve 18. In this state, no current is flowing through the coil 10, and the plunger 11 is pushed downward by the spring 12 in the figure. Therefore, as shown in FIG.
The flow path 3 communicating with the pipe 20 of 9 communicates with the flow path 11a formed in the plunger 11, and the LP in the use side container 19
G is the pipe 20, the flow path 11a of the plunger 11, the flow path 1
After passing through the channel 1c, the flow path 7, and the pipe 24, it is gasified by the vaporizer 23 and supplied to a predetermined supply facility.

When the LPG in the use side container 19 is consumed, the pressure in the use side container 19 decreases. The pressure drop at this time is due to the pressure switch 25 installed in the middle of the pipe.
When the pressure value decreases to the switching set pressure, the current is passed through the coil 10 of the solenoid valve 18 and the excited state is maintained. As a result, as shown in FIG.
The force of the spring 12 is pushed upward, and the plunger 11
Are moved to the lower surface of the core 9.

In the state shown in FIG. 2, the flow path 3 communicating with the side of the use side container 19 is blocked, and the flow path 11b formed in the plunger 11 communicates with the flow path 5. The flow path 5 communicates with a pipe 22 connected to the spare side container 21, and the LPG in the spare side container 21 passes through the pipe 22, the flow path 5, the flow path 11b formed in the plunger 11, and then through the pipe 24. , To the vaporizer 23.

Next, when the pressure in the spare side container 21 drops, the pressure switch 25 detects this drop in pressure, stops the supply of current to the coil 10, and puts it in a demagnetized state. Returning to the state of FIG.
To communicate with the flow path inside the plunger 11. By repeating such a switching operation, the solenoid valve 18
4 and the operation of the pressure switch 25 and the holding circuit are shown in FIG.
As shown in.

In this embodiment, since the switching operation can be performed fully automatically and accurately and no back pressure is applied,
Since the maximum operating pressure can be large and the orifice can be large, the flow rate of the liquid or gas can be increased, and the structure is simple, there are few failures, and the structure of the solenoid valve can be downsized.

FIG. 6 is a schematic sectional view showing another embodiment of the automatic switching solenoid valve of the present invention, showing a demagnetized state, and FIG. 7 shows an excited state. 6 and 7, in FIG.
The components having the same functions as those of the embodiment shown in FIG. 2 are designated by the same reference numerals, and the structural description will be omitted.

This automatic switching solenoid valve includes a shut-off valve coil 1
0a and switching valve coil 10b, and a shutoff valve plunger 26 is provided at the center of these coils 10a and 10b. A shaft portion 27 is fixed to the shutoff valve plunger 26, and a core 9 is disposed on the shaft portion 27 adjacent to the shutoff plunger 26 via a tool 28 formed of an O-ring.

The shaft portion 27 penetrates through the center portion of the spring 11 and is slidably arranged in the center portion of the plunger 11. A substantially umbrella-shaped cutoff valve 29 is provided at the tip portion of the shaft portion 27. The shut-off valve 29 is biased by the spring 30 to the plunger 11 side, that is, upward in the figure, and is detachably attached to the nozzle 31 formed at the lower end of the plunger 11.

As shown in FIG. 8, the solenoid valve 32 is designed so that a signal from a detector 33 for detecting an abnormal condition such as an abnormal temperature, an abnormal pressure or a gas leak is input to the shutoff valve coil 10a. Further, the signal from the pressure switch 25 is input to the switching valve coil 10b.

Next, the operation of this automatic switching solenoid valve will be described. The switching operation between the use side container 19 and the spare side container 21 is
The operation is the same as that described based on the automatic switching solenoid valve of FIG. In this automatic switching solenoid valve, when abnormal conditions such as abnormal temperature, abnormal pressure, and gas leakage are detected by the detector 33, the current flowing through the cutoff valve coil 10a is stopped based on the signal from the detector 33. .. As a result, the magnetic force applied to the shutoff valve plunger 26 disappears as shown in FIG. The path 11c is blocked, and the flow of LPG is blocked.

In the normal state, a current is applied to the shutoff valve coil 10a, and the shutoff valve plunger 26 is provided with a spring 30 due to the magnetic force generated by the shutoff valve coil 10a as shown in FIG. 7 (A). Since the shaft portion 27 integrally fixed to the shutoff valve plunger 26 is pushed downward because it is sucked by the core 9 against the force, the shutoff valve 29 is separated from the nozzle 31. Therefore, the flow path 11c is open.

FIG. 6 shows a state in which LPG from the spare side container 21 is being supplied to a predetermined supply facility via the flow path 5.
FIG. 7A shows a state in which LPG from the use side container 19 is being supplied to a predetermined supply facility via the flow path 3.
FIG. 7B shows a state in which, in the state of FIG. 7A, the shutoff valve 29 is pressed against the nozzle 31 formed in the plunger 11 when an abnormal situation occurs.

In this automatic switching solenoid valve, in addition to the effect of the embodiment shown in FIG. 1, a solenoid valve 60 for shutting off the flow of LPG to the detector 33 for detecting an abnormal situation as shown in FIG. It is possible to combine the functions of both the solenoid valve for switching and the solenoid valve that shuts off the flow path in the event of an abnormal situation in the solenoid valve 32 without providing the solenoid valve 32, and space can be saved. In addition, the workability of construction can be improved and the construction cost can be reduced.

In each of the above-described embodiments, the LPG has been described as an example, but the present invention is not limited to the LPG, and one series to another series for fluids other than LPG, such as fluids and gases. It can be used as a switching electromagnetic in a switching mechanism.

[0041]

As described above, according to the first aspect of the present invention, it is possible to perform a full automatic and accurate switching operation.
Also, since no back pressure is applied, the maximum operating pressure can be large, and since the orifice can be made large,
The flow rate of liquid or gas can be increased, and the structure is simple, so that there are few malfunctions and the structure of the solenoid valve can be miniaturized.

According to the invention of claim 2, claim 1
In addition to the effect of the invention of (1), it is possible to combine the switching function and the blocking function in the event of an abnormal situation.
The workability of construction can be improved and the construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an automatic switching solenoid valve of the present invention in a demagnetized state.

FIG. 2 is a schematic cross-sectional view of essential parts showing an excited state in the automatic switching solenoid valve of FIG.

FIG. 3 is an external view of an automatic switching solenoid valve of the present invention.

FIG. 4 is an explanatory diagram showing a valve operation and a pressure switch holding circuit in the automatic switching solenoid valve of FIG. 1.

FIG. 5 is a system diagram showing an LPG supply system in which the solenoid valve of FIG. 1 is installed.

FIG. 6 is a schematic sectional view showing another embodiment of the automatic switching solenoid valve of the present invention in a demagnetized state.

FIG. 7 is an explanatory diagram showing the electromagnetic operation of FIG. 2;

8 is a system diagram showing an LPG supply system in which the solenoid valve of FIG. 2 is installed.

FIG. 9 is a system diagram showing an LPG supply system in which a conventional solenoid valve is installed.

FIG. 10 is a system diagram showing another LPG supply system in which a conventional solenoid valve is installed.

FIG. 11 is a schematic configuration diagram showing an example of a conventional switching valve.

FIG. 12 is a schematic configuration diagram showing another example of a conventional switching valve.

FIG. 13 is a schematic configuration diagram showing still another example of the conventional switching valve, and is a diagram showing an operating state when energized.

FIG. 14 is a diagram showing an operating state of the conventional switching valve of FIG. 13 when not energized.

[Explanation of symbols]

 1 Electromagnetic Coil Box 2 Valve Part 3, 5, 7 Flow Path 9 Core 10 Coil 10a Shutoff Valve Coil 10b Switching Valve Coil 11 Plunger 12 Spring 18 Electromagnetic Valve 19 Working Side Container 21 Spare Side Container 23 Vaporizer 25 Pressure Switch 26 Shut-off plunger 29 Shut-off valve 30 Spring 31 Nozzle

Claims (2)

[Claims] 1. A coil for demagnetizing or exciting based on a signal from a pressure switch, a spring fixed to one end of a core disposed inside the coil and fixed to the other end of a core, and A first flow path formed in a biasing direction by a spring, and a second flow path and a third flow path formed substantially orthogonal to the biasing direction and spaced apart in the direction are formed. A valve section; and a plunger that is slidably disposed in the valve section and has flow paths formed in directions corresponding to the first, second, and third flow paths, respectively. An automatic switching solenoid valve characterized in that a flow path formed in a valve portion is closed or communicated with a sliding operation. 2. A coil for demagnetizing or exciting based on a signal from a pressure switch, a spring fixed to one end of a core disposed inside the coil and fixed to the plunger at the other end, A first flow path formed in a biasing direction by a spring, and a second flow path and a third flow path formed substantially orthogonal to the biasing direction and spaced apart in the direction are formed. A valve portion; and a plunger that is slidably disposed in the valve portion and has flow passages formed in directions corresponding to the first, second, and third flow passages, respectively, and A coil that performs demagnetization or excitation based on a signal from a detector that detects an abnormal situation, and a coil that is fixed to a core disposed inside the coil and that is movable in the plunger along the sliding direction. The shut-off valve provided at the tip of the shaft Automatic switching solenoid valve characterized by being