JP2017032027A - Gas cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a gas flow of a gas channel, concerning a gas cock equipped with a valve device (21), an excessive flow-out prevention valve (6), and a reset mechanism resetting the excessive flow-out prevention valve (6) after actuation, in a casing (1).SOLUTION: A reset mechanism has a moving cylinder (10) which moves forward/backward with a valve device (21) in a casing (1); an annular projecting portion (11) positioned on an upstream side of the annular projecting portion; and a reset plate (3) made from elastic material and interposed between the moving cylinder and the annular projecting portion. The reset plate (3) is kept in an initial state in which the reset plate is flat between the moving cylinder (10) and the annular projecting portion (11) when the valve device (21) is closed. When the valve device (21) is opened, a pressing piece (3b) extended from a ring portion (3a) to a center is elastically deformed so as to project out to a downstream side. A tip end of the pressing piece (3b) in this state, projects out to the downstream side than a reset shaft (61) projecting to the downstream side from an excessive flow-out prevention valve (6) at actuation, and the reset shaft (61) is returned to an initial position by the elastic return force of the pressing piece (3b).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas stopper, and more particularly, to a gas stopper that includes an overflow prevention valve and a reset mechanism that resets the overflow prevention valve after operation.

As a gas stopper having a built-in overflow prevention valve, the one shown in Patent Document 1 was invented.
As shown in FIGS. 10 (A) and 10 (B), this is provided at the downstream end portion (upper open end portion in the drawing) of the casing (31) having the connecting screw portion (31a) connected to the gas pipe. The plug part (2) for connecting the socket (4) is screwed and connected, and the casing (31) is over-flow prevented by blocking the gas flow path when a gas of a certain flow rate or more flows. Contains the valve (5) and the reset mechanism (30) that returns the valve body in the overflow prevention valve (5) in the closed state to the original state after the operation of the overflow prevention valve (5). .
In the plug part (2), the valve device (34) is accommodated in a state of being biased to the closed state, and from the downstream side to the upstream side, the valve device (34), the reset mechanism (30), and the excessive outflow The prevention valves (5) are accommodated in a straight line.

  The reset mechanism (30) includes a moving member (30a) that can move in the forward / backward direction in the casing (31) and a leaf spring (30b) as shown in FIG. Is provided on the downstream side of the moving member (30a) in a state where both ends thereof are fitted in the notches (33) and (33) provided at positions facing the upstream open end of the moving member (30a), respectively. It is constructed on the annular convex part (32). An actuator (51) of the overflow prevention valve (5) protrudes into the annular convex part (32). When the overflow prevention valve (5) is in the open state, the actuator (51) is set to protrude higher than the annular protrusion (32) toward the downstream side, as shown in FIG. ing.

  (B) in the figure shows the normal use state in which the overflow prevention valve (5) is not operating when the socket (4) is connected to the plug (2). ) In the push-in shaft (40), the valve device (34) is pushed upstream to open the valve, and in response, the moving member (30a) also goes upstream via the push-in spring (35). Moving. Along with this, the leaf spring (30b) is elastically so that both ends thereof are pushed upstream by the notches (33) and (33) of the moving member (30a), and at the same time the central portion protrudes downstream. Bend. The actuator (51) protrudes into the central portion of the leaf spring (30b) curved in an arch shape.

  If any abnormality occurs downstream of the plug (2) and the gas is overflowing, the overflow prevention valve (5) is activated and closed, and the overflow prevention valve (5) The gas flow path is blocked. At this time, although not shown, the downstream end of the valve shaft (52) integrated with the valve body moves until it approaches the actuator (51).

When the overflow prevention valve (5) is activated and closed, remove the socket (4) from the plug (2) from the safety aspect during the repair work.
Then, as shown to (A) of the figure, a valve apparatus (34) moves to a downstream side with the urging | biasing force of a spring (36), and obstruct | occludes a plug part (2). At this time, since the pushing force by the pushing spring (35) acting on the moving member (30a) is released, the leaf spring (30b) returns to the initial posture, and the urging force of the leaf spring (30b) At the same time, the moving member (30a) is moved downstream, and at the same time, the actuator (51) is pushed upstream at the center. When the actuator (51) is pushed in, the valve shaft (51) moves upstream, and the valve body of the overflow prevention valve (5) is reset to the original open state.

JP-A-5-340484

  However, in the conventional gas plug, as a reset mechanism (30) for resetting the actuator (51), a leaf spring (30b) having a predetermined width is provided along the diameter of the gas flow path in the casing (31). Therefore, there is a problem that the flow path resistance in the casing (31) is large and the gas flow is deteriorated.

The present invention is a gas plug in which a linear gas flow path is formed from the upstream open end of the casing to the downstream open end to which the plug portion is connected,
A valve device that is biased in a direction to close the plug portion and opens when the socket is connected to the plug portion;
An overflow prevention valve that is provided upstream of the valve device and automatically shuts off the gas flow path when a certain amount of gas flows in the gas flow path;
In the gas stopper provided between the valve device and the overflow prevention valve and provided with a reset mechanism for returning the overflow prevention valve after the operation to the initial state, the flow of the gas in the gas flow path is The problem is to improve.

The gas stopper of the invention according to claim 1 is: "The reset mechanism is provided between the annular convex portion projecting downstream from the overflow prevention valve, the annular convex portion and the valve device, and outside the annular convex portion. A moving cylinder that has an inner diameter larger than the diameter and moves forward and backward in the casing in the same direction as the valve device, and an inner diameter and an outer diameter that are interposed between the moving cylinder and the annular protrusion and substantially coincide with the moving cylinder. A reset plate made of an elastic material comprising a ring portion and a belt-like pressing piece extending toward the center of the ring portion;
When the valve device is closed, the reset plate is maintained in a flat initial state between the upstream side end surface of the movable cylinder and the downstream side end surface of the annular convex portion located on the upstream side.
When the valve device is opened, the moving cylinder moves upstream, and the upstream end surface of the moving cylinder is positioned upstream from the downstream end face of the annular projection, so that the reset plate protrudes downstream. Elastically deformed into a shape to
The overflow prevention valve has a reset shaft that protrudes downstream during operation, and the degree of protrusion of the pressing piece is such that the tip of the pressing piece is positioned downstream of the downstream end of the reset shaft that is in the most protruding state. The reset shaft is pressed upstream by the elastic restoring force of the pressing piece and returns to the initial position ”.

The technical means operates as follows.
In the interior from the upstream end of the casing to the plug part, an overflow prevention valve, an annular convex part, a reset plate, a moving cylinder, and a valve device are arranged in this order, and when the socket is not connected to the plug part, the valve device is The plug portion is biased in the valve closing direction (downstream side). In this state, the upstream end surface of the moving cylinder is located downstream from the downstream end face of the annular protrusion, the reset plate ring portion is located upstream of the upstream end face of the moving cylinder, and the annular protrusion The reset plate is interposed between them in a flat initial state so that the vicinity of the base end portion of the pressing piece is located on the downstream side of the downstream end surface.

  From this state, when the socket is connected to the plug portion and the valve device is moved in the valve opening direction (upstream side), the movable cylinder also moves upstream, and the upstream end surface of the movable cylinder is downstream of the annular convex portion. Located upstream from the end face. As a result, the reset plate is pressed upstream by the upstream end surface of the movable cylinder, and at the same time, the pressing piece is pressed downstream by the annular convex portion in the vicinity of the base end portion. Is elastically deformed into a shape in which the tip of the tube protrudes downstream. In this state, the gas flows through the gas flow path in the casing to the downstream side of the plug portion.

When some abnormality occurs and the gas is in an excessive outflow state, the excessive outflow prevention valve is activated, and the tip of the reset shaft protrudes to the downstream side to the maximum protruding state. At this time, since the tip of the pressing piece protrudes downstream from the tip of the reset shaft, it does not interfere with the protrusion of the reset shaft.
If the socket is removed while this overflow prevention valve is in operation, the valve device will elastically return in the direction of closing the plug, the gas flow path in the casing will be shut off, and the moving cylinder will move downstream. Thus, the reset plate is elastically returned to the flat initial state. The reset shaft is pushed back at the tip of the pressing piece by the elastic restoring force of the pressing piece at that time, and the overflow prevention valve is reset to the initial state.

In the gas stopper, “a spring receiving plate for receiving a spring for urging the valve device in a valve closing direction is fixed in the casing,
A circumferential wall portion projecting downstream from the annular convex portion is provided concentrically on the outer side of the annular convex portion, and the annular convex portion and the circumferential wall portion are continuously provided via an annular bottom portion on the upstream side thereof,
It is desirable that the downstream end of the peripheral wall is engaged with the spring receiving plate in a state where the reset plate and the movable cylinder are accommodated in the peripheral wall.
In this, the annular convex part and the peripheral wall part are integrated through the annular bottom part, the reset plate and the moving cylinder are accommodated in the peripheral wall part, and the downstream end of the peripheral wall part is engaged with the spring receiving plate. By doing so, one unit body is constituted by the annular convex portion, the reset plate, the moving cylinder, and the spring receiving plate.

  In the gas plug, it is desirable that “a small protruding piece shorter than the pressing piece is extended at a position of the inner peripheral edge of the ring portion facing the pressing piece”. In this case, when the reset plate is set between the annular convex portion and the movable cylinder, the downstream end surface of the annular convex portion is set in a state where it is in contact with the vicinity of the base end portion of the pressing piece of the reset plate and the small protruding piece. When the valve device is opened, the reset plate is elastically deformed so that the pressing piece and the small protruding piece protrude downstream.

  In the above gas stopper, “the annular step portion into which the peripheral edge portion of the downstream end surface of the overflow prevention valve can be fitted is formed on the upstream surface of the annular convex portion so as to open inward and upstream”. Things are desirable. In this case, by inserting the downstream end of the overflow prevention valve accommodated in the casing into the annular stepped portion, the annular convex portion can be set in a positioning state in the casing.

As described above, according to the gas stopper of the present invention, the pressing piece of the reset plate provided as a reset mechanism for resetting the overflow prevention valve after operation to the original valve open state is provided at the center of the ring portion. Since the length is set to a certain length, the channel resistance is reduced as compared with the conventional plate spring that extends over the diameter of the gas channel.
In addition, since the tip of the pressing piece has a large amount of displacement and protrudes to the downstream side rather than bending a single leaf spring, the error of the degree of protrusion of the reset shaft protruding from the activated excessive outflow prevention valve is reduced. It is possible to reliably prevent the pressing piece from coming into contact with the reset shaft during the operation of the overflow prevention valve and hinder the closing operation of the overflow prevention valve.
In addition, by assembling a plurality of parts constituting the reset mechanism of the overflow prevention valve into a unit body in advance, the assembling work to the casing is simplified, and there is no inconvenience of losing each part separately. Furthermore, since the reset mechanism can be tested as a unit body, the reset mechanism can be easily tested and inspected, and even if there is a malfunction, it can be dealt with quickly.
In addition, a structure in which a pressing piece and a small protruding piece project at the opposing position of the ring portion and are in contact with the annular convex portion, respectively, improves the stability when the reset plate is accommodated and reliably The reset function of the overflow prevention valve can be exhibited.
Further, in the case where the peripheral portion of the downstream end face of the overflow prevention valve is fitted and positioned in the annular step provided on the upstream side of the annular protrusion, the annular protrusion is provided for the overflow prevention valve. It can be set easily and accurately. Thereby, the pressing piece of the reset plate set on the annular convex portion can be made to correspond accurately to the tip of the reset shaft of the overflow prevention valve. That is, the reset plate is positioned so that the pressing piece of the reset plate can be accurately pushed back to the tip of the reset shaft of the overflow prevention valve after the operation, so that reset failure can be reliably prevented.

It is sectional drawing which shows the normal use condition of the gas stopper of embodiment of this invention. It is sectional drawing which shows the state which the overflow prevention valve act | operated during use of the gas stopper of embodiment of this invention. It is sectional drawing which showed the mode immediately after removing the socket from the state of FIG. FIG. 4 is a cross-sectional view showing a state in which the overflow prevention valve has returned to the initial state from the state of FIG. 3. It is explanatory drawing of the reset board employ | adopted as the gas stopper of embodiment of this invention. It is explanatory drawing which shows the state which the reset plate employ | adopted as the gas stopper of embodiment of this invention elastically deformed. It is explanatory drawing which shows the initial state of the reset board employ | adopted as the gas stopper of embodiment of this invention. It is explanatory drawing of the excessive outflow prevention valve used for the gas stopper of embodiment of this invention, (A) has shown the normal time of valve opening, and (B) has shown the time of valve closing. It is a disassembled perspective view of the reset part employ | adopted for. It is a disassembled perspective view of the unit body employ | adopted as the gas stopper of embodiment of this invention. It is explanatory drawing of the conventional gas stopper, (A) is a non-use state, (B) is a sectional view showing the state in use, (C) is a leaf spring built in the conventional gas stopper It is a perspective view.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

In the gas stopper according to the embodiment of the present invention, the plug portion (2) is screwed and connected to the downstream open end of the casing (1), as in the conventional one.
FIG. 1 is a cross-sectional view showing a normal use state of a gas stopper according to an embodiment of the present invention. A casing (1) is a gas pipe joint (not shown) from an upstream side (lower side in the drawing). Connecting screw cylinder part (1a) to which the screw is connected, a small diameter part (1b) in which the overflow prevention valve (6) is accommodated, and a large diameter part (1c) larger than the small diameter part (1b) ) And the plug insertion cylinder part (1d), which is located downstream from the large diameter part (1c) and into which the plug part (2) is inserted, is configured to be continuous in a straight line, and the plug part (2) Is connected to the female screw portion formed at the downstream open end (19) of the plug insertion tube portion (1d) by screwing the male screw portion formed at the intermediate position of the plug portion (2). ing.
A stepped portion (18) is formed at the boundary between the small diameter portion (1b) and the large diameter portion (1c).

In the plug part (2), a valve device (21) comprising a plug valve (21a) and a slide plug (21b) is housed, and on the upstream side, the plug insertion cylinder part (1d) and the large diameter part In the casing (1) at the boundary portion with (1c), a metal spring receiving plate in which a central hole (20a) is formed at the center and a pair of holes (20b) are formed at opposite positions around the center hole (20a). (20) is fixed.
Further, the plug portion (2) is formed with a notch (2a), and the gas flow path passes from the connecting screw cylinder portion (1a) through the overflow prevention valve (6) that is open. The large diameter portion (1c), the hole portion (20b) of the spring receiving plate (20), the plug insertion tube portion (1d) and the notch portion (2a) communicate with the downstream end of the plug portion (2). It has a configuration.
As shown in FIG. 2, the gas flow path is connected to the plug portion (21) by the plug valve (21a) of the valve device (21) when the overflow prevention valve (6) is activated and as shown in FIGS. Blocked when the downstream end of 2) is closed.

The slide stopper (21b) of the valve device (21) is movable integrally with the plug valve (21a) pushed into the back by the push-in shaft (40) in the socket (4), and an upstream spring receiving plate ( It has a spring receiving tube (22) that opens toward 20).
Two outer coil springs (24) that urge the valve device (21) in the closing direction of the plug portion (2) are interposed between the bottom surface of the spring receiving tube (22) and the spring receiving plate (20). Has been.

  In the casing (1), on the upstream side of the spring receiving plate (20), a moving cylinder (10) that can move in the flow path direction in the large diameter part (1c) is accommodated. ) Has a cylindrical portion (15) penetrating from the upstream side to the downstream side through the central hole (20a) of the spring receiving plate (20) via a pair of support pieces (17) and (17). (See FIG. 9). Between the inner stepped portion projecting on the inner surface of the tube portion (15) and the bottom portion of the spring receiving tube (22) of the slide plug (21b), a pressing means for pushing the movable tube (10) upstream A pressing spring (23) is interposed.

An annular convex portion (11) is provided on the inner side upstream of the moving cylinder (10), and between the outer peripheral surface of the moving cylinder (10) and the large diameter portion (1c) of the casing (1), A peripheral wall portion (12) is interposed, and the annular convex portion (11) and the peripheral wall portion (12) are connected via an annular bottom portion (13) on the upstream side of each.
An annular step (14) is formed at the inner edge of the annular protrusion (11) so as to open inward and upstream. The diameter of the annular step portion (14) is set to a size that allows the downstream end of the case body (60) of the overflow prevention valve (6) described later to be fitted.

  As shown in FIG. 9, a plurality of slits that open to the downstream side are formed in the peripheral wall portion (12), and in a space surrounded by the peripheral wall portion (12), a reset plate (3) described later and The movable cylinder (10) having the cylindrical portion (15) is accommodated, the cylindrical portion (15) is inserted into the central hole (20a) of the spring receiving plate (20), and the peripheral wall portion (12) is mutually connected. If a pair of engaging pieces (12a) and (12a) positioned so as to face each other are engaged with engaging recesses (20c) and (20c) respectively provided at opposing positions on the outer peripheral edge of the spring receiving plate (20) The annular protrusion (11), the reset plate (3), the moving cylinder (10), and the spring receiving plate (20) form a unit body, and the moving cylinder (10) is placed in the peripheral wall (12). Thus, a reset mechanism movable in the direction of the flow path is configured.

As shown in FIG. 5, the reset plate (3) includes a ring portion (3a) having an inner diameter and an outer diameter substantially matching the inner diameter and the outer diameter of the movable cylinder (10), and one diameter of the ring portion (3a). A strip-shaped pressing piece (3b) extending from one end of the head toward the center, and a small protruding piece (3c) extending from the other end of the diameter shorter than the pressing piece (3b). It is formed of an elastic material. The pressing piece (3b) and the small protruding piece (3c) have a band shape slightly wider than the width of the ring portion (3a), but may have a taper shape with a thick base, or a hole such as a slit. It may be provided.
In the unit body, the ring portion (3a) is located on the upstream side of the upstream end surface (10a) of the movable barrel (10), and the area near the base end portion of the pressing piece (3b) and the small protruding piece (3c) are Located on the downstream side of the downstream end face (11a) of the annular protrusion (11), between the upstream end face (10a) of the movable cylinder (10) and the downstream end face (11a) of the annular protrusion (11). The reset plate (3) is set in a state in which it is maintained in a flat initial state. As shown in FIG. 7, the upstream end surface (10a) of the movable cylinder (10) is opposed to the ring portion (3a) from the downstream side. The downstream end face (11a) of the annular convex part (11) comes into contact with the vicinity of the base end part of the pressing piece (3b) and the small protruding piece (3c) from the upstream side.

  The overflow prevention valve (6) is accommodated in the small diameter portion (1b) of the casing (1) and, as shown in FIG. 8, the resin case body (60) is moved downstream by gas pressure. The moving valve body (62) is accommodated. In a normal state, as shown in FIG. 8A, the valve element (62) is urged away from the valve seat (63) by the urging force of the spring (64). The downstream end (61a) of the reset shaft (61) integrally provided at the center of the body (62) does not protrude to the downstream side of the case body (60), and the upstream end face is on the upstream side. It protrudes.

If any abnormality occurs downstream of the plug part (2) and the gas is overflowed, the overflow prevention valve (6) is activated and the valve is turned on as shown in FIG. The body (62) moves while being pushed downstream against the urging force of the spring (64), and presses against the valve seat (63). This is the closed state of the overflow prevention valve (6). At this time, the downstream end (61a) of the reset shaft (61) protrudes from the downstream side of the case body (60).
In order to release the valve closed state, the downstream end (61a) of the reset shaft (61) protruding downstream from the case body (60) is pushed into the inside. When the reset shaft (61) is pushed, the valve body (62) is pushed and moved upstream, and at the same time, the pressure bonding of the valve body (62) to the valve seat (63) is released. The valve element (62) returns to the original state separated from the valve seat (63) by the elastic return force of the spring (64).

  The small-diameter portion (1b) of the casing (1) is formed in a cylindrical shape having a size that allows the case body (60) of the overflow prevention valve (6) to be tightly accommodated, and the case body (60) A pair of protrusions (65) that are slightly elastically projected outward from the center of the section are respectively provided in a pair of notch grooves (16) provided at positions opposed to the peripheral surface of the small diameter section (1b). By the one-way engagement from the upstream side, the overflow prevention valve (6) is housed in the small-diameter portion (1b) of the casing (1) in a retaining state.

  To assemble the gas stopper (1) of this embodiment, first, from the downstream side of the casing (1), the annular convex portion (11), the reset plate (3), the movable cylinder (10), and the spring receiving plate (20 ) Is accommodated so that the annular bottom (13) is in contact with the step (18).

  Thereafter, the pressing spring (23) is accommodated in the cylindrical body (15) protruding downstream from the central hole (20a) of the spring receiving plate (20) from the downstream side of the casing (1), and the cylindrical body The outer coil spring (24) is set on the outer circumferential spring receiving plate (20) of (15), and the downstream end of the pressing spring (23) and the outer coil spring (24) is the spring stopper of the slide plug (21b). The valve device (21) is accommodated in the plug part (2) so as to be accommodated in the cylinder (22), and the plug part (2) is screwed to the downstream open end (19) of the casing (1). Connect. Then, the overflow prevention valve (6) is inserted into the small diameter portion (1b) from the connection screw tube portion (1a) side of the casing (1), and the case of the overflow prevention valve (6) is inserted into the annular step portion (14). When the peripheral edge of the downstream end of the body (60) is fitted, as shown in FIG. 4, the valve device (21) in the plug portion (2) urged in the valve closing direction, The unit body is located between the prevention valve (6) and the reset plate (3) is set in a flat initial state between the moving cylinder (10) of the unit body and the annular projection (11). In this state, the assembly of the gas stopper is completed.

When the socket (4) is connected to the plug portion (2) from this state, the valve device (21) is moved by the push-in shaft (40) in the socket (4) as shown in FIG. At the same time, the cylinder (15) is pushed upstream by the pressing spring (23), and the movable cylinder (10) moves upstream together with the cylinder (15). To do.
The upstream side end face (10a) of the movable cylinder (10) moves upstream until it is located upstream from the downstream side end face (11a) of the annular convex part (11). (3) As shown in FIG. 6, the ring part (3a) is pushed upstream by the upstream end face (10a) of the movable cylinder (10) and protrudes upstream, and the pressing piece (3b) The region near the base end is pushed by the downstream end surface (11a) of the annular convex portion (11), and elastically deforms so that the tip protrudes downstream.

The gas sent from the upstream side of the casing (1) flows into the overflow prevention valve (6), the annular projection (11), the ring plate (3a) of the reset plate (3), and the spring receiving plate (20). It flows from the downstream end of the plug part (2) into the pipe through the socket (4) through the hole part (20b) and the plug insertion cylinder part (1d).
Although the pressing piece (3b) and the small protruding piece (3c) protrude in the ring part (3a) of the reset plate (3), they are not formed over the diameter and protrude downstream. Therefore, the channel resistance is reliably reduced as compared with the conventional one in which a leaf spring is interposed over the diameter of the gas channel.

  When the overflow prevention valve (6) is activated and the valve is closed as shown in FIG. 8 (B), the valve body (62) in the overflow prevention valve (6) together with the reset shaft (61) The spring (64) is moved downstream against the urging force, and the downstream end (61a) of the reset shaft (61) protrudes downstream from the case body (60). When the downstream end (61a) of the reset shaft (61) protrudes to the maximum protruding state, as shown in FIGS. 2 and 6, the center of the ring portion (3a) of the reset plate (3) in the elastically deformed state The tip of the pressing piece (3b) is located further downstream than the downstream end (61a) of the reset shaft (61) that is in the most projecting state downstream. Therefore, the pressing piece (3b) does not come into contact with the downstream end (61a) of the reset shaft (61), and does not interfere with the protrusion of the reset shaft (61). Never become.

  When the overflow prevention valve (6) is actuated, the socket (4) is removed from the plug portion (2) from the viewpoint of safety during the repair work of the abnormality on the downstream side. Then, as shown in FIG. 3, the slide plug (21b) is moved downstream by the urging force of the outer coil spring (24), and the plug portion (2) is closed by the plug valve (21a). When the valve device (21) moves to the downstream side, the pressing force pressing the cylinder portion (15) and the moving cylinder (10) by the pressing spring (23) to the upstream side is released. Thereby, the reset plate (3) is elastically restored, and the moving cylinder (10) is moved to the downstream side by the elastic restoring force of the ring portion (3a), and at the same time, the pressing piece that has been urged to protrude to the downstream side ( 3b) is elastically restored to a flat initial state, and the downstream end (61a) of the reset shaft (61) is pushed into the case body (60) by the elastic restoring force of the pressing piece (3b) at this time.

When the downstream end (61a) of the reset shaft (61) in the overflow prevention valve (6) is pushed upstream, the pressure bonding of the valve body (62) to the valve seat (63) is released at the same time. The overflow prevention valve (6) is opened by the urging force of the spring (64) as shown in FIGS. 4 and 8, and is reset to the initial state.
In this way, the reset plate (3) having the pressing piece (3b) that pushes the downstream end (61a) of the reset shaft (61) in the protruding state to the upstream side, and the reset plate (3) are elastic. The annular convex portion (11) to be deformed and the movable cylinder (10) constitute a reset mechanism for the overflow prevention valve.

In addition, when the plug valve (21a) is pushed inward with the push-in shaft (40) of the socket (4), the pressure interposed between the slide plug (21b) and the inner step portion in the cylindrical body (15). With the spring (23), the cylinder (15) and the movable cylinder (10) integrated with the cylinder (15) can be moved upstream while elastically deforming the reset body (3). The pressing force of the cylinder (15) is set larger than the elastic force of the reset body (3).
In addition, when the socket (4) is removed from the state of FIG. 2 and the valve device (21) is moved to the downstream side to close the plug portion (2) by the elastic return force of the outer coil spring (24), the reset is performed. The movable cylinder (10) is set so as to be moved downstream until it is located downstream of the annular convex portion (11) by the elastic restoring force of the body (3).
Since the pressing spring (23) is provided as a pressing means for pressing the movable cylinder (10) together with the cylinder part (15), the sliding is performed when the socket is connected to the plug part (2). The difference between the amount of movement of the stopper (21b) and the amount of movement of the movable cylinder (10) can be adjusted and absorbed by the elasticity of the pressing spring (23).

In the gas stopper of the above-described embodiment, as described above, the pressing piece (3b) of the reset plate (3) for pushing the reset shaft (61) is a strip having a length of about the radius, and the plug portion ( In the open state of 2), it can be deformed so as to protrude downstream, so that the flow resistance is reduced compared to the conventional one in which leaf springs are installed along the entire diameter of the gas flow path. Gas flow can be improved.
In addition, since the degree of protrusion of the tip of the pressing piece (3b) can be larger than the degree of bending when one leaf spring is bent, it protrudes from the overflow prevention valve (6) that has been operated. Absorbs the error of the degree of protrusion of the reset shaft (61), and when the overflow prevention valve (6) operates, the pressing piece (3b) contacts the downstream end (61a) of the reset shaft (61) and overflow It is possible to reliably prevent the valve closing operation of the prevention valve (6) from being hindered.

(1) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Case
(10) ... Movable cylinder
(10a) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Upstream end face
(11) ...
(11a) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Downstream end face
(2) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Plug
(20) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Spring backing plate
(21) ... Valve device
(3) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Reset plate
(3a) ... Ring part
(3b) ... Pressing piece
(4) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Socket
(6) ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Overflow prevention valve
(61) ... Reset axis

Claims (4)

A gas plug in which a linear gas flow path is formed from the upstream open end of the casing to the downstream open end to which the plug portion is connected,
A valve device that is biased in a direction to close the plug portion and opens when the socket is connected to the plug portion;
An overflow prevention valve that is provided upstream of the valve device and automatically shuts off the gas flow path when a certain amount of gas flows in the gas flow path;
In the gas stopper provided with a reset mechanism provided between the valve device and the overflow prevention valve and returning the overflow prevention valve after the operation to the initial state,
The reset mechanism has an annular convex portion protruding downstream from the overflow prevention valve, an inner diameter larger than the outer diameter of the annular convex portion provided between the annular convex portion and the valve device, and in the same direction as the valve device. A moving cylinder that moves forward and backward in the casing, a ring portion that is interposed between the moving cylinder and the annular convex portion and has an inner diameter and an outer diameter that substantially match the moving cylinder, and extends toward the center of the ring portion. A reset plate made of an elastic material composed of a belt-shaped pressing piece provided,
When the valve device is closed, the reset plate is maintained in a flat initial state between the upstream side end surface of the movable cylinder and the downstream side end surface of the annular convex portion located on the upstream side.
When the valve device is opened, the moving cylinder moves upstream, and the upstream end surface of the moving cylinder is positioned upstream from the downstream end face of the annular projection, so that the reset plate protrudes downstream. Elastically deformed into a shape to
The overflow prevention valve has a reset shaft that protrudes downstream during operation, and the degree of protrusion of the pressing piece is such that the tip of the pressing piece is positioned downstream of the downstream end of the reset shaft that is in the most protruding state. The gas stopper according to claim 1, wherein the reset shaft is pressed upstream by the elastic return force of the pressing piece and returns to the initial position. The gas stopper according to claim 1, wherein a spring receiving plate that receives a spring that biases the valve device in a valve closing direction is fixed in the casing.
A circumferential wall portion projecting downstream from the annular convex portion is provided concentrically on the outer side of the annular convex portion, and the annular convex portion and the circumferential wall portion are continuously provided via an annular bottom portion on the upstream side thereof,
A gas stopper in which a downstream end of the peripheral wall is engaged with a spring receiving plate in a state where a reset plate and a movable cylinder are accommodated in the peripheral wall.   The gas plug according to claim 1 or 2, wherein a small protruding piece shorter than the pressing piece is extended at a position of the inner peripheral edge of the ring portion facing the pressing piece.   The gas stopper according to any one of claims 1 to 3, wherein an annular step portion into which the peripheral edge portion of the downstream end face of the overflow prevention valve can be fitted on the upstream surface of the annular convex portion is formed inward and upstream. A gas tap that is configured to open.

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