JP2813880B2 - Overflow prevention valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overflow prevention valve, and more particularly to an overflow prevention valve which can exert a delay effect when the overflow prevention valve operates.

[0002]

2. Description of the Related Art Some gas plug structures have a built-in overflow prevention valve. In the normal use state, the valve portion of the valve body is separated from the valve seat by a biasing means such as a spring to secure the gas flow, and the gas flows in the excessive flow state. Thus, the valve portion is seated on a valve seat to shut off gas flow.

[0003] Incidentally, a gas stopper structure having a built-in overflow prevention valve is connected to a gas pipe connected to another gas appliance. At that time, the gas stopper suddenly changes from a closed state to an open state. Then, there is a problem that a pseudo over-outflow state of gas occurs instantaneously and the over-outflow prevention valve operates. In order to solve such a problem, a device for a gas plug with a built-in overflow prevention valve has been proposed in Japanese Utility Model Publication No. 4-34295 and Japanese Utility Model Publication No. 4-34296. 4-3
In the device proposed in Japanese Patent No. 4295, a delay effect is provided by providing a projection on a valve shaft of a valve body of an overflow prevention valve, or a spiral engagement portion is provided on a valve shaft to forcibly rotate the valve. It's like having it done. On the other hand, the invention proposed in Japanese Utility Model Publication No. 4-34296 discloses a method in which a projection is provided on a valve shaft of a valve body at a position shifted along the traveling direction, and the projection is caught, thereby causing a delay effect. is there.

[0004]

However, in such a device, the delay effect may not be exhibited depending on the degree of collision of the projection. On the contrary, there is also a problem that the valve element of the overflow prevention valve does not sit on the valve seat due to the catch of the projection, and the function of the overflow prevention valve is impaired. Furthermore, even if a helical engagement portion is provided to forcibly rotate and generate a delay effect, the delay effect cannot be said to be sufficient, and the helical portion is required to exhibit the delay effect. Must be provided at a long distance in the traveling direction, and there is a problem that the valve shaft of the valve element becomes long. Since this valve stem is extremely thin in order to fulfill the function as an overflow prevention valve, it is difficult to form the valve stem, and it is more difficult to mold a helical portion on the extra-fine valve stem. There is a problem that is.

Therefore, the first aspect of the present invention is to provide an overflow prevention valve capable of reliably operating the overflow prevention valve without deteriorating the function of the overflow prevention valve and exhibiting a delay effect. Make it an issue. According to the second aspect of the present invention, the object of the first aspect of the present invention can be solved by embodying the specifics of the first aspect of the present invention, and the length of the valve shaft of the valve body can be reduced as compared with the related art. An object of the present invention is to provide an overflow prevention valve that can be easily formed.

According to the third aspect of the present invention, the same matters as those of the first aspect of the invention can be solved by embodying the specifics of the first aspect of the invention more than the second aspect of the invention, and the progress of the valve element can be improved. It is an object of the present invention to provide an overflow prevention valve which makes the flow smoother. According to a fourth aspect of the present invention, like the second aspect of the present invention, an overflow prevention valve is provided which embodies the specifics of the first aspect of the present invention and can solve the same problem as the second aspect of the present invention. The task is to

[0007]

According to the first aspect of the present invention, there is provided a valve seat, a valve body, and a forward / reverse rotation applying means. The valve element is seated on the valve seat in an overflow state. The forward / reverse rotation imparting means is responsive to the gas flow rate having become equal to or more than a predetermined value, for rotating the valve body alternately in the forward / reverse direction with the traveling direction as an axis, and for moving the valve body toward the valve seat.

[0008] With such an overflow prevention valve, more energy is required for rotating the valve body in the forward and reverse directions than simply rotating the valve body in one direction. In other words, even if the motor rotates in the forward direction, a state in which the motor rotates temporarily in the opposite direction and then stops temporarily occurs. Then, kinetic energy is required for increasing the speed, and the traveling toward the valve seat is correspondingly performed. Can be delayed.

According to a second aspect of the present invention, the valve seat according to the first aspect is formed on an inner surface of a cylindrical fixing member, and the forward / reverse rotation applying means includes a columnar member, a cylindrical member, and a first protrusion. And a first engaging portion. The columnar member is formed to extend corresponding to the axis. The cylindrical member is held by a fixed member, and the columnar member of the valve body can be inserted therein and held rotatably. The first protrusion is formed on the outer surface of the columnar member of the valve body. The first engagement portion is formed on the side surface of the tubular member so as to meander with respect to the axis, and the first protrusion is engaged with the first engagement portion.

According to the invention, when the valve body is directed to the valve seat, the first projection engages with the first engagement portion, and
The columnar portion of the valve body moves in the same manner as the meandering of the engaging portion, and as a result, the valve body moves toward the valve seat while rotating alternately in the forward and reverse directions. And the same effect as the first aspect is obtained. According to a third aspect of the present invention, in addition to the features of the second aspect of the present invention, a second projecting portion and a second engaging portion are further included. The second protrusion is formed on the outer surface of the columnar portion of the valve body, and the first protrusion is formed around an intersection between the cross section including the first protrusion perpendicular to the axis and the axis. It is formed symmetrically with the point. The second engagement portion is formed on the side surface of the cylindrical member so as to meander with respect to the axis, and the first engagement portion is formed around an intersection of a cross section perpendicular to the axis and the axis. The joint is formed point-symmetrically with the joint, and the second protrusion is engaged with the joint.

By providing the first and second projecting portions and the first and second engaging portions in this manner, the displacement of the valve shaft of the valve shaft in the cylindrical member can be reduced as compared with the second aspect of the present invention. Can be held down. According to a fourth aspect of the present invention, the valve seat of the first aspect is formed on an inner surface of a cylindrical fixing member, and the forward / reverse rotation applying means includes a columnar member of the valve body, a cylindrical member, a projecting portion, And an engagement portion. The columnar member is formed to extend corresponding to the axis. The tubular member is held by the fixed member, and further the columnar member of the valve body is inserted therein, and
It can be held rotatably. The protrusion is formed on the inner surface of the tubular member. The engagement portion is formed on the side surface of the columnar portion of the valve body so as to meander with respect to the axis,
The projections engage.

In this manner, the projection is formed on the cylindrical member,
Even when the engaging portion is formed on the columnar member of the valve body,
An operation similar to the operation of the second aspect is obtained.

[0013]

According to the first aspect of the present invention, since the valve body is advanced toward the valve seat while rotating the valve body alternately in the forward and reverse directions about the advancing direction as an axis, a large kinetic energy is required for forward and reverse rotation. As a result, the speed is reduced in the traveling direction, and a delay effect is exerted. Thereby, the operation of the overflow prevention valve in the pseudo overflow state can be reliably prevented.
Further, since the head rotates toward the valve seat while rotating alternately in the forward and reverse directions, the speed at which the valve element is seated on the valve seat does not exceed a certain level, so that a quiet seating is performed. Therefore, an effect that chattering can be prevented is obtained.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the valve element stops instantaneously when the valve body changes from forward to reverse or from reverse to forward with respect to the traveling direction. Therefore, the advance to the valve seat is slow, and the length of the columnar member of the valve body can be shortened accordingly. Since the valve body is made by ultra-fine molding, while reducing the molding difficulty by this amount,
The effect that the possibility of breakage or the like can be suppressed can also be obtained. Further, since the columnar member is inserted into the cylindrical member, the deviation from the axis of the cylindrical member is limited to the size inside the cylindrical member, and the deviation in the traveling direction is limited to a certain limit. You. As a result, the columnar member on the side where the first protrusion is not formed around the valve portion can be made as short as possible. In other words, the longer the shape of the valve along the gas flow, the more stable the movement is in that direction. Conventionally, the columnar member of the valve body moves in the direction of travel of the valve portion seated on the valve seat and vice versa. Although it is formed to extend in both directions, a columnar member may be provided especially on the side where the first protrusion is formed, and the molding of the valve body of the overflow prevention valve is simple by that much, and breakage etc. The effect that hardly occurs is obtained.

According to the third aspect of the present invention, the second projecting portion and the engaging portion are provided symmetrically in addition to the first projecting portion and the engaging portion. Fluctuation can be further suppressed, and the progress of the valve element can be made smoother. According to the fourth aspect of the invention, the same effect as in the second aspect can be obtained even when the projecting portion and the engaging portion are provided on opposite members.

[0016]

FIG. 1 is a sectional view showing a normal use state of a gas stopper structure according to an embodiment of the present invention, and FIG. 2 shows a state in which an overflow prevention valve is operated. FIG. 3 is a cross-sectional view showing a state in which connection with another gas pipe is disconnected. FIG. 4 is a cross-sectional view showing a state in which the overflow prevention valve is reset by being connected to another gas pipe. FIG. 5 is an enlarged view around the reset unit in FIGS. 1 to 4, and FIG. 6 is an enlarged view of the overflow prevention valve in FIGS. 1 to 4. FIG. 7 is a cross-sectional view of the center member of the reset unit in FIG. 6, and FIG. 8 is a diagram illustrating the shape of the engaging portion of the center member as viewed from the line VIII-VIII in FIG.

Referring to FIG. 1 and FIG.
Is covered with a gas pipe 11 serving as a casing, and includes a slide stopper 12 and a reset portion 13.
And an overflow prevention valve 14. The slide stopper 12, the reset portion 13, and the overflow prevention valve 14 are provided in this order in a straight line from the downstream side in series. The gas plug structure 10 includes a downstream gas flow path 15, a gas flow path 16, and an upstream gas flow path 1 as a gas circuit.
7 is included. The slide stopper 1 is located downstream of the gas flow path 16.
2, and the upstream side of the gas flow path 16 is opened and closed by an overflow prevention valve 14. Downstream gas passage 15
It is determined whether or not the upstream side is opened with the gas flow path 16 by the slide stopper 12, and the downstream side of the downstream gas passage 15 is connected to another gas pipe by the slide stopper 12 and is opened. Is determined. The overflow prevention valve 14 determines whether or not the downstream side of the upstream gas flow path 17 is open with the gas flow path 16. The gas flow path 16 has a cylindrical shape as a whole, and is provided so as to include the reset portion 13 inside the gas flow path outside the gas flow path.

The slide stopper 12 includes a connecting portion 12a, an opening / closing portion 12b, a spring 12c, and a spring 12d. The connection portion 12a is connected to the opening / closing portion 12b by a spring 12c, and determines opening / closing with another gas pipe. The opening / closing portion 12b is connected to the bottom 21a of the U-shaped partition 21 which is a partition between the gas flow path 16 and the reset portion 13 by a spring 12d, in addition to the connecting portion 12a. The spring 12d urges the opening / closing portion 12b of the slide plug 12 in a direction away from the bottom 21a of the partition 21 when no other gas pipe is connected.

The connection between the downstream gas flow path 15 and the gas flow path 16 is defined by a gas passage hole 18. The inner diameter side of the gas passage hole 18 is opened and closed by the opening / closing portion 12b of the slide plug 12, so that the downstream gas flow path 15
It is determined whether or not and the gas circulation path 16 are in a circulation state. The reset unit 13 includes a leaf spring 19 and a pin 20. The pin 20 is a member that is movable within a predetermined range on a straight line in the sliding direction of the slide stopper 12. The movement of the predetermined range or more is performed by moving the bottom 21 a
And a pin stop ring 20 on the downstream side.
b. One end on the downstream side of the pin 20 has a pin tapered surface 20 a having a certain angle with respect to the sliding direction of the slide stopper 12. Pin taper surface 20
a is a surface corresponding to the shape of the substantially conical side surface as a whole. That is, the shape of one end on the downstream side of the pin 20 is a conical shape in which a circle whose radius increases as the cross-sectional shape goes toward the upstream side is continuously formed. The leaf spring 19 has a shape generally like an ohm symbol as a whole, and is an elastic member. The leaf spring 19 includes a first contact member 19a and a second contact member 19b, each of which contacts a different part of the pin tapered surface 20a of the pin 20. Further, the leaf spring 19 includes a loop-shaped loop member 19c. First contact member 19a and second contact member 19b
Are connected to the loop member 19c while being inclined in the same direction as the inclination direction of the pin tapered surface that comes into contact. The loop member 19c is attached to the lower surface of the opening / closing portion 12b of the slide plug 12. In addition, the pin stop ring 20b
Has a ring shape, but may be formed integrally with the pin 20. Further, the pin tapered surface 20a may have a substantially truncated conical shape as a whole, and may not have a circular cross section. Further, if the loop member 9c spreads and the first and second contact members 19a, b come off contact with one end of the pin 20,
One end of the pin 20 may be flat instead of a tapered surface. In this case, the contact members 19a and 19b need not be inclined.

Referring to FIGS. 1, 6, 7 and 8, the overflow prevention valve 14 includes a valve seat 24, a reset rod 22, and a valve body 25. The valve seat 24 is formed on the frame 23. The valve body 25 includes a valve shaft 25a extending along the sliding direction of the slide plug 12 and a valve portion 25b to be seated on the valve seat 24. The valve shaft 25a is a cylindrical member. It is a disk-shaped member. Also, the valve shaft 25
The first protruding portion 25c and the second protruding portion 25d are arranged on the most downstream side of a so that the center line of the valve shaft 25a is axially symmetric with respect to the center line and the same cross section. Is formed.

Incidentally, the valve shaft 25a only extends shortly to the upstream side when viewed from the valve portion 25b, but is not formed as long as in the prior art. That is, the upstream side as viewed from the valve portion 25b of the valve shaft 25a only needs to be long enough to fit into the hole provided in the center of the valve receiver 28, and a longer length is not necessarily required. This is because it is sufficient that the length is such that the centering of the valve body 25 is performed.

The reset rod 22 includes a center member 22a and an engaging member 22b. The central member 22a has a cylindrical shape as a whole. An engaging member 22b such as a flange is connected to the side surface of the central member 22a. One end of the reset rod 22 on the downstream side of the center member 22 a is formed in a convex shape so as to contact with one end on the upstream side of the pin 20. The other end of the reset rod 22 on the upstream side of the center member 22a has a concave shape with an opening so that the valve shaft 25a of the valve body 25 can be inserted therein and held rotatably.

As shown in FIG. 8, a first engaging portion 22c is formed on the side surface of the center member 22a of the reset rod 22 in a wavy shape so as to meander in the traveling direction of the valve body 25. I have. Note that the solid line in FIG. 8 corresponds to the first engaging portion 22c, and the broken line in FIG. 8 corresponds to the second engaging portion 22d. First
The engaging portion 22c and the second engaging portion 22d are cuts through which both the inside and the outside penetrate. First engagement portion 22c
Is engaged with the protruding portion 25c of the valve body 25, and the second engaging portion 22
d engages with the second projection 25d of the valve body 25. That is, the first engagement portion 22c and the second engagement portion 22d
In the figure, a wave-shaped cut is formed at a position symmetrical with respect to the axis with the traveling direction of the valve element 25 as the axis.

The reset rod 22 is engaged with the frame 23 by engaging a ring-shaped ring-shaped projection 22e located on the outermost side of the engagement member 22b with a recess 23a formed on the frame 23. It is held and can be slid by a predetermined distance. Engaging member 2 of reset rod 22
2b is connected to the frame body 23 by a spring 26,
It is urged in a direction away from the valve body 25. Valve body 25
Is directly connected not to the frame 23 but to the reset rod 22 by a spring 27, and is urged in a direction away from the reset rod 22.

By the way, as shown in FIG. 9A, conventionally, the valve element 31 is seated on the valve seat 32, the length of the spring 33 for urging the valve body 31 is L1, and the reset rod 34 is attached. The length of the spring 35 to be urged is L2, and the length of the frame 36 to which the spring for urging the valve body 31 and the reset rod 34 is attached is L.
In the case of 3, the length of L4 was required in addition to L1. On the other hand, as shown in FIG. 9B, in the overflow prevention valve 14, even if the length of the spring 26 for urging the reset rod 22 is required to be L2, it is within the range of the length L1 of the spring 27. Only needs to be done. Therefore, the length of the valve shaft of the valve body can be shortened by at least the length of L4, so that the molding is simple and the damage is hardly caused.

Further, since the spring 27 is directly mounted between the valve portion 25b of the valve body 25 and the reset rod 22, the urging force when the valve portion 25b of the valve body 25 is seated on the valve seat 24 is reduced. If it is the same as before, the urging force is increased by the movement of the reset rod 22, and the reset operation can be performed reliably. Conversely, considering that the reset rod 22 moves, the reset rod 22 and the valve portion 25b of the valve body 25 are correspondingly moved.
Can be shortened, and the length of the valve shaft 25a of the valve body 25 can be further reduced. Therefore, the molded shape of the valve shaft 25a becomes easier, and damage is less likely to occur.

Next, the operation will be described mainly with reference to FIGS. In the state shown in FIG. 1, the gas stopper structure 10 is in a normal use state, that is, connected to another gas pipe, and
This shows a case in which the state is not the overflow state, in which the slide stopper 12 slides to the reset portion 13 side, and the valve body 25 of the overflow prevention valve 14 is not seated on the valve seat 24. In this state, the gas flows through the upstream gas flow path 17, the inside of the overflow prevention valve 14, the gas flow path 16, the gas passage hole 18, and the downstream gas flow path 15 to another gas pipe.

As described above, when the slide stopper 12 slides toward the reset portion 13 and the gas passage hole 18 is opened to the downstream gas passage 15 and the gas circulation passage 16, the reset portion 13 is locked. It has been in a state where it was done. That is, the leaf spring 19 and the pin 20 of the reset unit 13
Is provided by a slide stopper opening / closing portion 12b and a partition 21,
The downstream gas flow path 15 and the gas flow path 16 are separated from each other. As described above, since the leaf spring 19 and the pin 20 are not provided in the passage of the gas passage 16, there is no obstruction to the gas passage. Therefore, gas flow is in a smooth state. Therefore, since the overflow prevention valve 14 is reliably seated on the valve seat along a smooth flow, the reliability of the overflow prevention valve is improved.

Further, since the gas flow path 16 is provided outside the reset section 13, it is considered that it is difficult to secure the flow path of the gas flow path 16 unless the size of the gas pipe is increased. However, where D _0, D _1, D ₂ is taken up as shown in FIG. 5, D ₀ ≒ if D _1, the cross-sectional area equivalent to the cross-sectional area [pi] D ₀ ^2/4 in the cylindrical passage [pi (D ₂ ² -D ₁ ²⁾
Even when / 4 is required, since D ₂ ≒ 2 ^1/2 D ₀ is sufficient, the distance between the outer and inner diameters of the cylinder, which is equivalent to the radius of the cross-sectional area of the cylinder, is not required. Therefore, the distance between the outer diameter and the inner diameter is not required to be so large, and a sufficient flow passage in the gas pipe 11 can be secured. Further, the symmetry is ensured, and the mounting operation in the manufacturing process of the gas stopper is facilitated.

Next, in the case where the gas is over-discharged due to the occurrence of something above the downstream side of the downstream-side gas flow path 15, the over-discharge prevention valve 14 is operated. That is, when an abnormality occurs on the downstream side of the downstream side gas flow path 15 and the gas flow rate becomes equal to or more than a certain value, the valve body 25 of the overflow prevention valve 14
Starts moving toward the frame 23. The movement in this case proceeds toward the valve seat 24 while rotating alternately forward and backward around the traveling direction as the axis. This is because the first protrusion 25c of the valve body 25 is engaged with the first engagement portion 22c, and the second protrusion 25d of the valve body 25 is engaged with the second engagement portion 22d. Because. That is, the first engagement portion 22c
And the second engaging portion 22d are both formed in a shape meandering with respect to the traveling direction of the valve body 25 and are formed at line-symmetric positions, so that the first projecting portion 25c is By moving along the first engagement portion 22c, the second protrusion 25d moves along the second engagement portion 22d. As a result, the valve body 25 advances toward the valve seat 24 while rotating forward and backward alternately.
Since the progress here is alternating between forward and reverse, when the rotation direction changes from reverse to forward or from forward to reverse, the valve element 25 is temporarily but stopped. Therefore, after the direction changes, the speed increases until the next direction changes, but the traveling speed of the valve body 25 increases only to a certain constant speed.
Accordingly, when the valve portion 25b of the valve body 25 is seated on the valve seat 24 as shown in the state shown by the broken line in FIG. 6 and the state shown in FIG. The accompanying chattering is prevented.

To put it the other way around, the length of the valve shaft 25a of the valve body 25 can be reduced by an amount corresponding to the slow progress to the valve seat 24. Since the valve shaft 25a is formed by extra-fine molding, the difficulty of molding can be reduced by that much, and the possibility of breakage can be suppressed. Also, the valve shaft 25a is
Since the central member 22a is inserted into the central member 22a, the deviation from the axis of the central member 22a is limited to the size inside the central member, and the deviation in the traveling direction is limited to a certain limit. As a result, the valve shaft 25a on the side where the projecting portions 25c and d are not formed around the valve portion 25b can be made as short as possible. That is,
Conventionally, the longer the shape of the gas along the gas flow, the more stable the movement in that direction.
5 is formed so as to extend in both the traveling direction and the opposite direction when viewed from the valve portion 25b.
In particular, the valve shaft 25a may be provided on the side where d is formed, and the molding of the valve body 25 is simplified by that much, and breakage and the like hardly occur. In addition, the first protruding portion 25c and the engaging portion 22
Since the second protruding portion 25d and the engaging portion 22d are provided symmetrically in addition to c, the displacement of the valve member 25 with respect to the axis in the center member 22a is suppressed, and the valve body 25 moves smoothly.

Next, another gas pipe is removed from the viewpoint of safety in order to repair the abnormality on the downstream side. As a result, as shown in FIG. 3, the slide stopper 12 slides to close the upstream side and the downstream side of the downstream gas flow path 15. By this time, the leaf spring 19 attached to the slide plug 12 engages with the side surface of the pin 20 and then comes into contact with the pin tapered surface 20a. It moves with 12.

Next, a case where the abnormality on the downstream side is repaired and connected to another gas pipe will be described. The slide stopper 12 moves to the reset unit 13 side by being connected to another gas pipe,
First contact member 19a of leaf spring 19, second contact member 1
9b comes into contact with the pin tapered surface 20a of the pin 20. In the contact state, the leaf spring 19 pushes the pin 20 to a position where the overflow prevention valve 14 is reset. One end on the upstream side of the pin 20 is connected to the center member 2 of the reset rod 22.
Since the reset rod 22 is in contact with one end of the convex shape of 2a, the reset rod 22 is also pushed upstream. Here, the first engagement portion 22c is
Not all waves meander. The most downstream position of the first engagement portion 22c has an expanded shape like a first opening 22f. Similarly, the most downstream position of the second engagement portion 22d has a widened shape like the second opening 22g. Therefore, the reset rod 22 is pushed in linearly, and the concave other end of the center member 22 a of the reset rod 22 pushes the valve portion 25 b of the valve body 25 seated on the frame 23.

As described above, since the valve portion 25b of the valve body 25 is pushed in by the reset operation, the valve shaft 25a is not bent or damaged as in the case where the valve shaft 25a is pushed in, and the overflow prevention valve 14 is reliably provided. Is performed, the valve body 25 is prevented from being damaged, and the possibility of rebuilding the device can be reduced, which is economical. In particular, since the center member 22a of the reset rod 22 pushes the valve portion 25b around the valve shaft 25a of the valve body 25 in a ring shape, pushing is performed in units of lines or planes, and the point at the tip of the valve shaft 25 is formed. The pressing force per unit becomes smaller as compared with the pushing in with the pressure, and the probability of damage to the valve body 25 becomes smaller.

Then, the valve portion 25b separates from the valve seat 24,
By the urging force of the spring 27, the valve body 25 is pushed back to the valve receiver 28 while rotating alternately in the forward and reverse directions. FIG. 4 shows a state where the valve body 25 is held by the valve receiver 28. The slide stopper 12 moves further upstream, but the pin 20
Does not move upstream. Therefore, the leaf spring 19 receives forces from both sides between the opening / closing portion 12b of the slide plug 12 and the pin tapered surface 20a of the pin 20. As a result, since the force is dispersed, the leaf spring 19 is deformed to change to a state in which the contact between the contact members 19a and 19b and the pin tapered surface 20a is released. Pin taper surface 2
Since 0a is inclined, the force applied from the pin tapered surface 20a to the first contact member 19a and the second contact member 19b is in an oblique direction, and the first contact member 19a and the second contact member 19b are inclined.
Is applied in such a direction that the abutment member 19b spreads right and left. Since the side of the loop member 19c attached to the slide stopper 12 is widened, the distance between the first abutting member 19a and the second abutting member 19b increases as the pushing proceeds, and the pin taper gradually increases. The contact area with the surface 20a decreases. And finally the first
The contact between the contact member 19a, the second contact member 19b, and the pin tapered surface 20a is lost, and the state is as shown in FIG. That is, the leaf spring 19 is located outside the pin 20, and the pin 20 rises with the reset rod 22 raised by the urging force of the spring 26.

The leaf spring 19 and the pin 20 of the reset unit 13
Are moving on a straight line which is the sliding direction of the slide stopper 12. As described above, in the case of moving on a straight line, the pin 20 must be pushed to push the overflow prevention valve 14, and thereafter the pin 20 must be in a movable state. At this point, the pin is in a movable state. However, more precisely, in order not to hinder the operation of the overflow prevention valve, the reset rod 22 is connected to the overflow prevention valve 1.
The fourth valve body 25 is urged in a direction in which it is movable so as to move away, and accordingly, the pin is also urged to the most downstream side.
Therefore, the conventional complicated mechanism is not provided,
The reset part is easy to manufacture due to its simple structure,
In addition, malfunction is reduced due to the simple structure.

By the way, the overflow prevention valve 14 is not reset until the normal connection state shown in FIG. 1 is disconnected from the other gas shown in FIG. This is because the pin 20 does not always reset the overflow prevention valve 14 until the leaf spring 19 closes its tip and separates from the pin 20. It is considered that whether or not the resetting is performed depends on the closing strength of the leaf spring 19, the shape of the tapered surface, the moving speed of the slide line 12, and the like. Conversely, there may be a case where the overflow prevention valve 14 is reset to the state shown in FIG. 10 before the state shown in FIGS. Also in this case, the fact that the overflow prevention valve 14 according to the embodiment of the present invention is effective will be described.

FIG. 11 is a graph showing the gas flow rate when the slide pipe slides from the state shown in FIG. 10 to open the gas pipe. In FIG. 11, the horizontal axis is time, the vertical axis is gas flow, and the point when the slide pipe slides from the closed state to the open state by the slide stopper is defined as the origin. Therefore, the gas flow rate is gradually increasing.
Thereafter, the gas flow exceeds one peak. This is because no gas is present in the connected gas pipe and the gas pressure difference is large, so that the gas flow rate temporarily becomes abnormal before the steady state is reached. This phenomenon is referred to as a pseudo-overflow state.

In the graph shown in FIG. 11, the time from when the steady gas flow rate Q ₀ further increases to the overflow state Q and the overflow prevention valve is seated on the valve seat is defined as T1. Therefore, T1 needs to be a time longer than the time T2 during which the overflow prevention valve can operate in the pseudo-overflow state. Conversely,
In order to make the time T1 long, it is necessary to delay the advance of the overflow prevention valve.

The overflow prevention valve 14 shown in FIG. 6 is also excellent in this respect. That is, since the valve element 25 advances toward the valve seat 24 while rotating alternately in the forward and reverse directions, as described above, the speed of the valve element 25 does not increase to a certain speed or more, and as a result, the valve element 25 is seated on the valve seat 24. The time is slower than before. The reason is as described above. Conventionally, a spiral projection is provided on the valve shaft for one-way rotation, for example, in order to delay the rotation, and for further delay, the spiral density is increased or the length of the valve shaft is increased. We have to make it longer. On the other hand, in the case of the overflow prevention valve 14 shown in FIG. 6, it is not necessary to increase the length of the valve shaft, and a sufficient delay effect can be obtained by forward and reverse rotation. Further, even if a further delay effect is obtained, the first and second engagement portions 22c, 22c
This can be handled by changing the shape of d. For example, it is possible not only to increase the density by increasing the number of meandering peaks and valleys, but also to change the meandering shape. For example, in the case of a gentle meander, it is difficult to stop in the traveling direction, and in the case of a square shape, it is easy to stop in the traveling direction. Therefore, the delay time can be controlled thereby. In any case, the valve shaft having the same length has a delay effect as compared with the rotation in one direction only by alternately rotating in the forward and reverse directions.

In particular, since the conventional reset mechanism of the overflow prevention valve operates when another gas pipe is disconnected, when the conventional resetting unit 13 is used, the resetting mechanism of this embodiment is used. The advantage of the overflow prevention valve 14 can be exhibited. (Others related to the gas flow path 16) Although the straight gas plug structure in which the mechanism of the reset unit 13 is not provided in the path of the gas flow path 16 is shown, the invention is not limited to the linear gas plug structure. For example, it may be L-shaped.

The gas flow path 16 is cylindrical, but is not limited to a cylindrical shape. For example, it may have a semi-cylindrical shape. Further, except that the reset unit 13 is not provided in the gas flow path 16, the reset unit 13 and the overflow prevention valve 14 may be of a conventionally known technology.

Further, although the gas passage hole 18 has a ring shape, it may have a slit shape. (Others related to the reset unit 13) The reset unit 13
May extend to the upstream side and be integral with the reset rod 22.

Further, the reset section 13 may be the one according to the embodiment of the present invention, and the overflow prevention valve 14 may be a conventional well-known one. In this case, the tip of the valve shaft 25a of the valve body 25 in the overflow prevention valve 14 is pushed in to perform the resetting operation.
2 is not provided, and the valve shaft 25a is provided at one end on the upstream side of the pin 20.
May be pushed in. However, the pin 20
Is preferably urged downstream by a spring,
It is not necessarily required to be urged, and it is sufficient if the valve body 25 is movable so that it can be seated.

Further, the leaf spring 19 of the reset unit 13
Although an ohmic symbol was used as a whole, it is not limited to this. For example, only half of the ohmic symbols may be used. In this case, the tapered surface of the pin 20 only needs to be formed at a position facing the tapered surface, and need not be formed over the entire surface. On the other hand, if such leaf springs are arranged at equal intervals with respect to the circumference of the three pins 20, for example, the pins 20 can be uniformly pushed, and no blur occurs, and the pushing operation can be reliably performed. Can be performed.

(Others related to the excessive outflow prevention valve 14)
The number of protrusions formed on the valve shaft 25a may be one. In the case where one protruding portion is formed, FIG.
As shown in FIG. 12A, another method may be used as shown in FIGS. In FIG. 12B, the valve shaft of the valve body 25 is cylindrical, and a protruding portion is formed on the inner surface thereof.
The case where the reset rod 22 has a cylindrical shape and an engaging portion is formed on the side surface is shown. FIG. 12 (c) shows a case where the valve shaft of the valve body 25 is cylindrical and the engaging portion is formed on the side surface thereof, and the reset rod 22 is cylindrical and the projecting portion is formed on the inner side surface thereof. . FIG. 12D shows a case where the valve shaft of the valve body 25 is cylindrical, an engaging portion is formed on the side surface, and the reset rod 22 is cylindrical and a protruding portion is formed on the outer surface thereof. . FIG. 12E shows a case where the valve shaft of the valve body 25 is extended to the upstream side, a protruding portion is formed on an outer surface thereof, and an engaging portion is formed on a side surface of the cylindrical member. . FIG.
FIG. 12 (e) corresponds to FIG.
Methods such as those shown in FIGS. 12B to 12D can be applied to 2 (e).

Further, the first projecting portion 25c and the second projecting portion 25d of the valve body 25 are provided at positions symmetrical with respect to the valve shaft 25a, but are shifted with respect to the traveling direction of the valve body. It may be provided at a position. However, in this case, it is necessary to form the protruding portion by shifting every meandering cycle. Further, the two protrusions may be shifted in the circumferential direction of the valve shaft. Further, three projections may be provided at equal intervals in the circumferential direction.

Further, the first engaging portion 2 of the reset rod 22
The 2c and the second engaging portion 22d may be cut as if penetrated as in the embodiment, or may be like a groove which is not penetrated. Further, the first protrusion and the second protrusion may be connected to and integrated with the cut through. Further, the shapes of the valve shaft 25a of the valve body 25 and the central member 22a of the reset rod 22 are as follows.
They are respectively cylindrical and cylindrical, but need not be limited to these. For example, the valve shaft 25a may be shaped like a square pole, and the reset rod 22 may be shaped like a polygonal cylinder. However, in any case, it is necessary that the valve shaft of the valve body 25 alternately rotates forward and backward inside the reset rod 22.

Further, as shown in FIG. 13 (a), the other end of the center member 25a of the reset rod 22
13B, the ring-shaped portion 29 around the valve shaft 25a is pushed in, but the hatched portion 30 in the valve portion 25b in FIG.
Any of the regions may be pushed. further,
From the viewpoint of pushing the valve portion 25b of the valve body 25, the reset rod 22 may be extended to the pin 20 of the reset portion 13.

Further, from the same viewpoint, the projecting portions 25c and d of the valve body 25 and the engaging portions 22c and d of the central member 22a of the reset rod 22 are not necessary. Further, the overflow prevention valve 14 according to the embodiment is used as the overflow prevention valve, and the reset unit may be a conventional known technology. Further, in the embodiment,
Although the valve shaft on the upstream side of the valve body is shown to be short, it may be long as in the prior art and inserted into the hole of the valve receiver even when the valve body is operating. In this case, the displacement during operation of the valve element is smaller.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a gas stopper structure during normal use.

FIG. 2 is a cross-sectional view of the gas stopper structure showing a state in which an overflow prevention valve has been operated in an overflow state.

FIG. 3 is a cross-sectional view of the gas plug structure showing a state where connection with another gas pipe is disconnected.

FIG. 4 is a cross-sectional view of the gas stopper structure showing a stage in which another gas pipe is connected and a slide stopper is sliding.

FIG. 5 is an enlarged view around a reset unit 13 in FIGS. 1 to 4;

FIG. 6 is an enlarged view of the overflow prevention valve in FIGS. 1 to 4;

FIG. 7 is an end view of a center member of the reset rod.

FIG. 8 is a view showing the shape of the engaging portion of the central member as viewed from the line VIII-VIII in FIG. 7;

FIG. 9 is a diagram for explaining the effect of the overflow prevention valve.

FIG. 10 is a cross-sectional view of the gas plug structure showing a state in which the overflow prevention valve is reset when the gas pipe is disconnected.

FIG. 11 is a graph showing a gas flow rate after connection to another gas pipe.

FIG. 12 shows a reset rod 22 and a valve body 2 of the overflow prevention valve 14.
It is the figure which showed the other example 5 of FIG.

FIG. 13 is a view for explaining a contact portion of a valve portion of a valve body.

[Explanation of symbols]

 14 Overflow prevention valve 22a Central member 22c, d engagement portion 23 Frame 24 Valve shaft 25 Valve 25a Valve shaft 25c, d Projection

Claims (4)

(57) [Claims] 1. A valve seat, a valve body seated on the valve seat in an over-outflow state, and the valve alternately reciprocally with its traveling direction as an axis in response to a gas flow rate exceeding a predetermined value. While rotating the body, provided with forward and reverse rotation imparting means to advance toward the valve seat,
Overflow prevention valve. 2. The valve seat is formed on an inner surface of a cylindrical fixing member, and the forward / reverse rotation applying means includes a column-shaped member of the valve body extending and formed corresponding to the axis. A cylindrical member that is held by the fixing member and that can be rotatably held by the columnar member of the valve body inserted therethrough and a first protrusion formed on an outer surface of the columnar member of the valve body; 2. The overflow prevention device according to claim 1, further comprising: a first engagement portion formed on a side surface of the tubular member so as to meander with respect to the axis, and the first protrusion is engaged with the first engagement portion. 3. valve. 3. The forward / reverse rotation applying means further includes a cross section formed on an outer surface of a columnar member of the valve body and including the first protrusion in a direction perpendicular to the axis. A second protrusion formed point-symmetrically with the first protrusion about an intersection with an axis, formed on the side surface of the tubular member so as to meander with respect to the axis, and A second engaging portion in which the first engaging portion is formed to be point-symmetric with respect to an intersection of a cross section perpendicular to the axis and the axis, and the second projecting portion is engaged with the first engaging portion; The overflow prevention valve according to claim 2, comprising: 4. The valve seat is formed on an inner surface of a cylindrical fixing member, and the forward / reverse rotation applying means includes a column-shaped member of the valve body extending and formed corresponding to the axis. A tubular member that is held by the fixed member, and further has a columnar member of the valve body inserted therein and rotatably held therein; a protrusion formed on an inner surface of the tubular member; The overflow prevention valve according to claim 1, further comprising: an engaging portion formed on a side surface of the columnar member so as to meander with respect to the axis, and the projecting portion is engaged with the engaging portion.