JPH1163278A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an easy opening of a valve even if pressure difference generates in gas between both surfaces of a valve element by providing a main valve backed with a slider and integrated therewith at its central portion, and an auxiliary valve which is engaged with and disengaged from a central hole at an end of a shaft. SOLUTION: A main valve 1 having a ring shape is backed with a slider 2 made of synthetic resin and integrated therewith at a center. At a center of the slider 2 a center hole is formed, and three support pieces 23 are formed at equal angular intervals coaxially with the center hole on the side opposite to the main valve 1. An auxialiary valve 3 is provided at an end of a shaft 4 so that the center hole of the slider 2 allows the valve 3 to be released therefrom. Accordingly, gas pressure in both surfaces of the slider 2 integrated with the main valve 1 is made equal, whereby the valve can be opened easily even if pressure difference generating in gas between both surfaces of a valve element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solenoid valve,
In particular, the present invention relates to a solenoid valve which can easily perform a valve opening operation in a case where a pressure difference occurs between both surfaces of a main valve when gas or other fluid is shut off.

[0002]

2. Description of the Related Art A conventional example of a solenoid valve will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a ring-shaped main valve which abuts on and separates from the valve seat to open and close the solenoid valve V, and is constituted by a rubber plate. The main valve 1 is lined with a slider 2 made of synthetic resin and integrated at the center. A center hole 21 is formed in the center of the slider 2, and a plurality of back pressure release holes 22 are formed concentrically with the center hole 21. The shaft 4 is inserted through the center hole 21 of the slider 2 and guided by the shaft. The base, which is one end of the shaft 4, is fixedly connected to the tip of a movable core 7 made of a magnetic material. A driving plate 5 is further fixed orthogonally to the tip of the movable iron core 7 and is engaged with the inner surface of the slider 2. A locking plate 91 is attached and fixed to the other end of the shaft 4. An auxiliary coil spring 9 is interposed between the locking plate 91 and the outer central end surface of the slider 2 of the main valve 1. Reference numeral 3 denotes a sub-valve which is fixedly connected to the distal end of the movable iron core 7, and engages with the inner central end surface of the slider 2 as a valve seat to form a back pressure release opening 22
Is opened and closed.

A drive coil 11 is wound around a bobbin 12,
It is positioned in a magnetic circuit composed of a main yoke 15 and a sub-yoke 16 made of a magnetic material. The movable iron core 7 has a sub-yoke center hole 161 and a bobbin center hole 12.
1 is inserted through a pipe 19. Prior to inserting the movable core 7, the magnet 18 and the receiver 17 are attached to the pipe 19. 13 and 1
4 is an O-ring. The main coil spring 8 is interposed between the driving plate 5 and the sub yoke 16.

[0004] The manner of use of the solenoid valve V is as shown in FIG. The solenoid valve V has its main valve 1
Is opened and closed by abutment and separation with the valve seat 101 configured as described above. The state shown in FIG. 3 shows a closed state in which the main valve 1 abuts on a valve seat 101 formed in the valve seat portion 100. For example,
The gas is supplied from the gas pipe side, which is the primary side, to the gas equipment side, which is the secondary side, and the state shown in FIG. Since the valve is in a closed state, it is shut off here and is not supplied to the gas equipment side.

Here, the changeover switch 110 is operated to instantaneously turn on the power supply 120 to turn on the drive coil 11.
Is excited, the movable iron core 7 is instantaneously driven in the direction of the solid line arrow, and is attracted and held by the receiver 17 connected to the magnet 18. In response, the shaft 4, the locking plate 91, the sub-valve 3, and the driving plate 5 connected to the movable iron core 7 are also driven instantaneously in the direction indicated by the solid arrows, and this state is maintained.
At this time, since the back pressure release opening 22 of the slider 2 is released by the detachment of the sub-valve 3, the gas pressure on both surfaces of the main valve 1 and the slider 2 integrated therewith becomes equal. Here, the locking plate 91 is driven by the movable iron core 7 through the shaft 4 in the direction of the solid line arrow, and since the gas pressures on both surfaces of the slider 2 become equal, the main valve 1 and the slider 2 Driving can be easily performed via the locking plate 91 and the sub coil spring 9. Therefore, the main valve 1 separates from the valve seat 101 formed in the valve seat portion 100,
An open state is realized.

In the open state of the main valve 1, when the changeover switch 110 is reversely operated to instantaneously turn on the power supply 120 to the opposite polarity to the previous state to excite the drive coil 11, the movable iron core 7 moves in the direction of the chain line arrow. The movable iron core 7 is detached from the receiver 17. The drive coil 11 has a receiver 17
From the moment when it is separated from the movable iron core 7, the shaft 4, the sub-valve 3, and the driving plate 5 connected to the movable iron core 7 are driven in the direction of the chain line arrow by the main coil spring 8 interposed between the driving plate 5 and the sub-yoke 16. When the valve 3 engages and closes the back pressure release opening 22 of the slider 2 and the main valve 1 engages and closes the valve seat 101 formed in the valve seat portion 100, the solenoid valve V is eventually closed. Switch to valve state.

[0007]

In the conventional example of the solenoid valve V shown in FIG. 4, the guide of the main valve 1 is provided by the center hole 21 of the slider 2.
When the main valve 1 is opened, the auxiliary coil spring 9 for returning the main valve 1 must be arranged outside the main valve 1. The size is increased by the amount of the sub coil spring 9 projecting. Since the center hole 21 of the slider 2 is used as a guide portion of the slider itself, the formation position of the back pressure release opening 22 must be concentric with the center hole 21. The diameter of the sub-valve 3 that opens and closes increases, and the reliability of gas leakage decreases.

According to the present invention, there is provided an electromagnetic valve in which the above-mentioned problem is solved in that the valve can be easily opened even if a pressure difference is generated in the gas between both surfaces of the valve body in a gas shut-off state. Valve V is provided.

[0009]

[Means for Solving the Problems]

Claim 1: A shaft having a main valve 1, a slider 2 having a center hole 21 formed therein and lining the main valve 1 and integrated at a center portion, and a sub valve 3 engaging and disengaging from the center hole 21 at a distal end portion. 4, a movable iron core 7 and a drive coil 11 for driving the shaft 4, and a solenoid valve comprising a main coil spring 8 and a sub coil spring 9 for biasing the main valve 1 in opposite directions.

Claim 2: In the solenoid valve according to claim 1, the drive plate center hole 5 into which the shaft 4 is fitted.
The solenoid valve provided with the drive plate 5 on which 1 was formed. Further, in the electromagnetic valve according to the third aspect of the present invention, an electromagnetic valve in which the shaft 4 is fixed to the movable iron core 7 via the elastic cylinder 6 is formed. Claim 4: In the solenoid valve according to any one of claims 2 and 3, the slider 2 is provided with a hook 231 at the tip end concentrically with the center hole 21 on the side opposite to the main valve 1. Thus, an electromagnetic valve is formed in which the auxiliary coil spring support piece 23 is formed and the drive plate 5 is formed with a support piece insertion groove 52 through which the auxiliary coil spring support piece 23 is inserted.

According to a fifth aspect of the present invention, in the solenoid valve according to the fourth aspect, the main coil spring 8 is interposed between the driving plate 5 and the driving coil 11, and the sub coil spring 9 is a sub coil spring support piece 23. An electromagnetic valve interposed between the hook 231 at the tip of the drive plate 5 and the drive plate 5 is constructed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a sectional view of the entire embodiment, and FIG. 2 is a sectional view showing a part of FIG. 1 in an enlarged manner. 1 and 2, the same reference numerals as those in FIG. 4 indicate the same members.

The ring-shaped main valve 1 is lined with a slider 2 made of synthetic resin and integrated at the center. A center hole 21 is formed in the center of the slider 2, and three sub-coil spring support pieces 23 are formed concentrically with the center hole 21 on the side opposite to the main valve 1 at equal angular intervals. The vicinity of the center hole 21 at the center of the inside of the slider 2 forms a valve seat with which the sub-valve 3 is engaged and separated. Sub coil spring support piece 23
Are respectively inserted into the corresponding support piece insertion grooves 52 formed in the drive plate 5, and the bent hook 231 and the drive plate 5
And a sub coil spring 9 is interposed between them. The drive plate 5 is connected and fixed to the shaft 4 via a drive plate center hole 51. The distal end of the shaft 4 is a sub-valve fitting portion 41, and the sub-valve 3 made of an elastic material is fitted and fixed. The other end of the shaft 4 is an elastic cylindrical body fitting portion 42, and the elastic cylindrical body 6 as an elastic body is fitted and fixed. Reference numeral 71 denotes an elastic cylinder locking portion formed at the tip of the movable iron core 7. By press-fitting and fixing the elastic cylinder 6 to the elastic cylinder locking portion 71,
The main valve 1 is connected to the movable iron core 7 via the slider 2, the driving plate 5, the shaft 4, and the elastic cylinder 6. The elastic cylindrical body 6 is provided between the movable iron core 7 and the shaft 4 to give a slight degree of freedom in a direction perpendicular to the shaft 4.

The drive coil 11 is wound around a bobbin 12,
It is positioned in a magnetic circuit constituted by a main yoke 15 and a sub-yoke 16 made of a magnetic material. The movable iron core 7 has a sub-yoke center hole 161 and a bobbin center hole 12.
1 is inserted through a pipe 19. Prior to inserting the movable core 7, a magnet 18 and a receiver 17 are attached to the pipe 19, and the main coil spring 8 is inserted into the movable core 7.

Here, the opening and closing operation of the solenoid valve will be described. First, the valve opening operation will be described. The mode of use of the solenoid valve V is as shown in FIG. The solenoid valve V is opened and closed with its main valve 1 abutting and separating from the valve seat 101. The state shown in FIG. 3 shows a closed state in which the main valve 1 abuts on a valve seat 101 formed in the valve seat portion 100. The gas, which is a fluid, is supplied from the gas pipe side, which is the primary side, to the gas equipment side, which is the secondary side, but the state shown in FIG. Since it is in the valve state, it is shut off here and is not supplied to the gas equipment side.

When the power supply 120 is momentarily turned on by operating the changeover switch 110 to excite the drive coil 11, the movable iron core 7 is instantaneously driven in the direction of the solid line arrow, and the receiver 17 is coupled to the magnet 18. Is held by suction. In response to this, the sub-valve 3 and the drive plate 5 are also instantaneously driven in the direction of the solid line arrow via the elastic cylinder 6 and the shaft 4 connected to the movable iron core 7. At this time, slider 2
Is opened when the sub-valve 3 is released, so that the gas pressures on both surfaces of the main valve 1 and the slider 2 integrated therewith become equal. Therefore, the slider 2 has the auxiliary coil spring support piece 23 formed on the opposite side of the main valve 1 with the auxiliary coil spring 9 interposed between the hook 231 and the driving plate 5.
, The main valve 1 and the slider 2 can be easily driven by this pressing drive. Accordingly, the main valve 1 is provided in the valve seat 1
01 and the valve-open state is realized.

Next, the valve closing operation will be described. In the valve open state of the main valve 1, the changeover switch 110 is reversely operated to instantaneously turn on the power supply 120 to a polarity opposite to that of the valve closing operation. When the drive coil 11 is excited, the movable iron core 7 is instantaneously driven in the direction of the dashed arrow, and the movable iron core 7 is separated from the receiver 17. The drive coil 11 has a receiver 17
The elastic cylinder 6 connected to the movable iron core 7 from the moment when it is separated from the movable core 7, the shaft 4, the sub-valve 3, and the driving plate 5
The sub-valve 3 is driven in the direction indicated by a dashed line arrow by a main coil spring 8 interposed between the main yoke 16 and the sub-yoke 16 so that the sub-valve 3 engages and closes the center opening 21 of the slider 2 of the slider 2 and the main valve 1 is By engaging and closing the valve seat 101 constituted by 100, the solenoid valve V is eventually switched to the closed state.

[0018]

As described above, in the solenoid valve of the present invention, the center hole 21 is formed, and the slider 2 that lines the main valve 1 and is integrated at the center is disengaged from the center hole 21. A shaft 4 having a sub-valve 3 at its distal end is formed, and by detaching the sub-valve 3 from the center hole 21, the main valve 1
To make the fluid pressure difference between the primary side and the secondary side equal.
The driving operation of the sub-valve 3 having a very small pressure difference on both sides as compared with the main valve 1 requires only a small driving force for the driving operation, and the power consumed for the valve opening operation can be reduced.

The center hole 21 for equalizing the pressure difference between the primary side and the secondary side of the main valve 1 is not formed on the concentric circle of the center hole 21 as in the prior art.
Since it is formed individually, its diameter and the diameter of the sub-valve 3 can be reduced. Therefore, reliability regarding gas leakage can be improved. In addition, since the shaft 4 for driving the main valve 1 by fitting and holding the driving plate 5 is fixed to the movable iron core 7 via the elastic cylinder 6, the main valve 1 of the solenoid valve is slightly moved with respect to the valve seat 101. Even if it is inclined, the shaft 4 and the main valve 1 are given degrees of freedom to compensate for this inclination,
The main valve 1 can be properly engaged with the valve seat 101 and closed.

Further, the connection between the shaft 4 and the movable iron core 7 is fitted and fixed via the elastic cylinder 6, so that the connection between the two can be crimped, screwed, tightened, and other assembling work and parts processing. It is not required and can be implemented very easily. A sub-coil spring support piece 23 having a hook 231 at the distal end is formed concentrically with the center hole 21 on the side opposite to the main valve 1 on the slider 2, and the sub-coil spring 9 is connected to the distal end of the sub-coil spring support piece 23. By interposing between the hook 231 and the drive plate 5, the configuration for driving the main valve 1 when the valve is opened does not protrude outside the main valve 1 as in the conventional example, and the total length of the solenoid valve can be reduced. it can.

[Brief description of the drawings]

FIG. 1 illustrates an embodiment.

FIG. 2 is an enlarged view of a part of FIG.

FIG. 3 is a diagram illustrating a mode of use of a solenoid valve.

FIG. 4 is a diagram illustrating a conventional example.

[Explanation of symbols]

 Reference Signs List 1 main valve 11 drive coil 12 bobbin 121 bobbin center hole 13 O-ring 14 O-ring 15 main yoke 16 sub-yoke 161 sub-yoke center hole 17 receiving 18 magnet 19 pipe 2 slider 21 center hole 22 back pressure release opening 23 sub-coil Spring support piece 231 Hook 3 Secondary valve 4 Shaft 41 Secondary valve fitting part 42 Elastic cylinder fitting part 5 Drive plate 51 Drive plate center hole 52 Support piece insertion groove 6 Elastic cylinder 7 Movable iron core 71 Elastic cylinder locking part Reference Signs List 8 main coil spring 9 sub coil spring 91 locking plate 100 valve seat 101 valve seat 110 selector switch 120 power supply

Claims (5)

[Claims] 1. A main valve, a slider having a central hole formed therein and lining the main valve and integrated at a central portion, a shaft having a sub-valve at a distal end engaging and disengaging from the central hole, and driving the shaft An electromagnetic valve comprising: a movable iron core and a driving coil; and a main coil spring and a sub coil spring that bias the main valve in opposite directions. 2. The electromagnetic valve according to claim 1, further comprising a driving plate having a driving plate center hole into which a shaft is fitted. 3. The electromagnetic valve according to claim 2, wherein the shaft is fixed to the movable iron core via an elastic cylindrical body. 4. The solenoid valve according to claim 2, wherein the slider has a sub-coil spring support having a hook at a distal end concentric with a center hole on a side opposite to the main valve. An electromagnetic valve, wherein a support plate insertion groove is formed in the drive plate for inserting the sub coil spring support member. 5. The solenoid valve according to claim 4, wherein the main coil spring is interposed between the driving plate and the driving coil, and the sub coil spring is connected to the hook at the tip of the sub coil spring support piece and the driving plate. A solenoid valve interposed between the solenoid valves.