JPS636541Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application) The present invention is a valve operating device, in particular, a so-called lift valve, which opens and closes a flow path by moving toward and away from the valve seat at right angles to the valve seat. Regarding the operating type of valve operating device, it can be used for multiple purposes as a flow path opening/closing device.

(Prior art and its problems) As a valve operating device of this type, the one in Utility Application No. 72275/1987 has already been proposed, but this is built into a gas tank with an overflow prevention valve, and is designed to prevent overflow. The lift valve 1 is opposed to the valve seat opening 21 of the lift valve 1, and the lift valve 1 is rotated by a gas stopper closure 3, and the lift valve 1 is opened and closed depending on the rotation position. (See Figure 5)
For this reason, the lift valve 1 has a pair of legs 11, 11.
is provided, which is fitted onto the main body 2 of the overflow prevention valve, and a first permanent magnet 4 is provided on each of the legs, and this lift valve is inserted into a notch 32 of a cylindrical portion 31 provided on the closure 3 and mated. Furthermore, two sets of second permanent magnets 5, 5 and a third permanent magnet 6, each consisting of a pair of permanent magnets, are provided at a position facing the first permanent magnet, that is, at the base of the main body 2 of the overflow prevention valve. , 6 are installed. (See Fig. 6) Furthermore, the polarity of the second permanent magnet and that of the third permanent magnet are set opposite to each other, and in the initial position of the closure 3, the first permanent magnets 4, 4 of the legs 11, 11 and the second permanent magnets 5, 5 face each other and an attractive force acts,
On the other hand, when the shutter 3 is in the fully closed position, the first permanent magnets 4, 4
and the third permanent magnets 6, 6 are arranged to face each other so that a repulsive force acts on them in the opposite direction.

Therefore, in this conventional device, the lift valve 1 is opened by the repulsive force only when the closure 3 is in the fully open position, and when the closure 3 is placed in the half-open state, the lift valve 1 is closed. This eliminates the inconvenience of using the container in a half-open state. In other words, when used in a half-open state, the amount of gas passing through the overflow prevention valve will not reach the operating flow rate even if the gas rubber pipe connected to the gas pipe is disconnected, so the overflow prevention valve will operate even in abnormal conditions. However, with the above-mentioned conventional method, this problem is solved.

In the above, in order to match the open position of the lift valve 1 with the fully open position of the closure 3 as much as possible and to stabilize the closed state of the lift valve 1, as shown in FIG. The boundary part 7 between the permanent magnets 5, 5 and the third permanent magnets 6, 6 is located on the end point side of the rotation range of the first permanent magnet 4 which rotates together with the closure 3.

Then, the relationship between the rotation angle of the closure 3, that is, the first permanent magnet 4, and the opening degree of the lift valve 1 becomes as shown in FIG. 8, which satisfies the above requirements to some extent.

However, even with this configuration, the rise of the opening operation of the lift valve 1 becomes gradual, and the lift valve 1 may be in an incompletely opened state, although to a very small extent. (See Figure 8) The first permanent magnet 4 is the boundary 7 between the second and third permanent magnets.
This is because if the first permanent magnet is located at , sufficient repulsive force will not act on the first permanent magnet and the lift valve 1 will not be lifted sufficiently.

(Technical Problem) The present invention has a pair of first permanent magnets provided on the lift valve facing the second and third permanent magnets provided on the circumference coaxial with the lift valve. The polarities of the second and third permanent magnets are set to be opposite to each other, and the lift valve is coupled to a rotary cylinder provided coaxially with the axis of movement of the lift valve, and the positive rotation of the fixed cylinder causes the lift valve to In a device in which the lift valve is opened and closed by reverse rotation, the first permanent magnet is located at the boundary between the second and third permanent magnets in order to prevent the lift valve from being incompletely opened. The object of the present invention is to temporarily prevent the lift valve from opening due to the incomplete valve opening force that occurs when the valve opening force coincides with the lift valve.

(Means) The technical means of the present invention for solving the above problems is to provide a first protrusion partially protruding in the radial direction on the outer periphery of the lift valve, and a peripheral wall of the cylinder chamber that accommodates the lift valve so as to be movable in the axial direction. a second protrusion in the radial direction is provided, and the first protrusion and the second protrusion are connected only during the period from the position where the first permanent magnet coincides with the boundary between the second permanent magnet and the third permanent magnet to the fully open position. are arranged so that they engage with each other in the direction of movement of the lift valve.

(Operation) The above technical means of the present invention operates as follows. When the lift valve is rotated (rotated) by the rotary cylinder, the lift valve moves in the axial direction due to the mutual attraction and repulsion of the permanent magnets due to the relationship between the first permanent magnet and the second and third permanent magnets. Move to open and close.

To explain this opening/closing operation in more detail, when the first permanent magnet coincides with the boundary between the second and third permanent magnets, a slight magnetic force acts on the lift valve in the valve opening direction, but the magnetic force in the other valve closing direction acts on the lift valve. The lift valve does not open because it cancels out the magnetic force.

As the lift valve rotates further, the magnetic force in the valve opening direction gradually increases, but at this point, the first protrusion and the second protrusion are engaged in the axial direction (direction of opening/closing movement of the lift valve). , the valve remains closed.

When the lift valve rotates further and reaches the final position (valve open position), the first and second protrusions are disengaged from each other, and the first permanent magnet has completely moved to the third permanent magnet side. The valve is completely opened by the magnetic force of both magnets.

Next, the lift valve is rotated back from this position, and the first and second protrusions are again engaged in the axial direction, and the lift valve is rotated back in the open state, and the first and second protrusions are no longer engaged with each other. At the time when the first permanent magnet comes off, the first permanent magnet has reached the initial position side from the boundary between the second and third permanent magnets, and the lift valve is closed by the mutual magnetic force between the first permanent magnet and the second permanent magnet. Become.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

The lift valve opens only at the final position of the opening/closing operation of the rotary cylinder, that is, the fully open position, and is in a half-open state at the intermediate position, that is, near the point where the first permanent magnet coincides with the boundary between the second and third permanent magnets. The inconvenience caused by this can be prevented.

Also, in the valve closing operation using the rotary cylinder, the first,
Since the lift valve closes instantaneously when the second protrusions are disengaged from each other, the inconvenience of leaving the lift valve in a half-open state can be prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The embodiment shown in Figs. 1 and 2 is used in a gas tank equipped with an overflow prevention valve, in which a lift valve 1 corresponds to the main body 2 of the overflow prevention valve.
The lift valve 1 rotates integrally with the projection 12 of the lift valve through engagement with a notch 32 provided in the closure 3 of the gas cock, and is then mated.

In this lift valve 1, a cylindrical member is connected to the lower end of the legs 11, 11, and first permanent magnets 4a, 4b are embedded in the lower end of this cylindrical member, and this is the overflow prevention valve of the Kotuku main body. It faces a magnet set 56 consisting of a combination of second and third permanent magnets provided on the mounting portion.

In this embodiment, two sets of first permanent magnets are used, and one set of first permanent magnets 4
a, 4a are both in their initial positions, second permanent magnets 5,
5 and has a polarity such that it receives repulsive force from both third permanent magnets 6 and 6 at the final position. the first of the other group
The permanent magnets 4b, 4b are set to have polarities opposite to those described above.

Next, a pair of first protrusions 13, 13 protrude from the upper part of the cylindrical member of the lift valve 1, and a corresponding pair of protrusions 13, 13 protrude from the upper part of the cylindrical member of the lift valve 1. Second protrusions 82, 82 are provided.

In order to form the first protrusion 13, in this embodiment, a groove 15 is cut in the circumferential direction so as to form a collar 14 of a constant width on the upper part of the cylindrical member of the lift valve 1. A notch 16 is provided at a suitable location in the brim.
16 is formed, and the space between these notches becomes the first protrusion 13.

The second protrusion 82 fits into the groove when the valve is open, and comes close to the upper surface of the flange 14 when the valve is closed. Therefore, the thickness of the flange 14 is made to match the amount of movement (lift) of the lift valve 1, and the lower surface of the second protrusion 82 coincides with the upper surface of the flange 14 in the valve closed state, and the second projection 82 matches the upper surface of the flange 14 in the valve open state. The upper surface of the two protrusions 72 coincides with the lower surface of the collar portion 14.

Next, in this embodiment, an O-ring 22 is used as a valve seal gasket, and this is attached to the upper end of the main body 2, and the lift valve 1 is not provided with a gasket.

Furthermore, a first permanent magnet, a second permanent magnet, a third permanent magnet,
The distance between the first and second projections is set as shown in FIG. 3, and when the first permanent magnets 4a, 4b coincide with the boundary 7, the first and second projections overlap (engage) with each other, This engagement is released in the final position,
In this final position, each of the first permanent magnets 4a, 4b faces a second or third permanent magnet of mutually repelling polarity.

In this case, the relationship between the vertical movement amount (opening degree) of the lift valve 1, the rotation angle of the lift valve 1, and the first and second protrusions is shown as the movement locus of the first protrusion 13.
It will look like Figure 4. That is, the first protrusion 13 opens or closes the valve at the position where the second protrusion 72 is removed.

In the case of the above-described embodiment, a weak valve-closing force may be applied to the spring in advance to the lift valve 1. In addition, in order to provide a design allowance for the relative positions of the first and second protrusions, a configuration can be adopted in which the second protrusion 82 can be moved slightly upward from the set position under downward force bias, and conversely, the same purpose can be achieved. Therefore, a configuration can be adopted in which the first protrusion 13 of the lift valve 1 can be moved slightly downward with respect to the lift valve 1 under a rising force biased state.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of the lift valve 1, FIG. 3 is a plan view showing the relationship between each permanent magnet and the protrusions, and FIG. 4 is the locus of movement of the first protrusion 13. Fig. 5 and Fig. 6 are explanatory diagrams of the conventional example, Fig. 7 shows the relationship between each permanent magnet when this is improved, and Fig. 8 shows the opening degree of the lift valve in this case. This is a diagram of changes. In the diagram 1...Lift valve, 12...Protrusion, 13...First
Protrusion, 21..., 4... first permanent magnet, 5... second permanent magnet, 6... third permanent magnet, 7... base,
82...Second protrusion.

Claims (1)

[Scope of utility model registration request] A pair of first permanent magnets provided on the lift valve are opposed to second and third permanent magnets provided on a circumference coaxial with the lift valve, and the polarities of the second and third permanent magnets are set in opposite directions. , the lift valve is mated to a rotating cylinder provided coaxially with the axis of movement of the lift valve, and the lift valve is opened by forward rotation of the rotating cylinder,
A first protrusion partially protruding in the radial direction is provided on the outer periphery of the lift valve, and a second protrusion in the radial direction is provided on the peripheral wall of the cylinder chamber that accommodates the lift valve so as to be movable in the axial direction. A valve operating device in which the first protrusion and the second protrusion engage with each other in the direction of movement of the lift valve only from a position that coincides with the boundary between the magnet and the third permanent magnet to a fully open position. .