JP6305118B2 - Gas tap with fuse - Google Patents

Description

  The present invention relates to a gas plug with a fuse provided with a fuse valve that automatically closes the gas passage when the flow rate of the gas flowing in the gas passage of the gas plug exceeds a predetermined flow rate.

  In general, as described in Patent Document 1 below, a gas plug with a fuse has a plug body provided with a gas passage therein, a valve body provided in the gas passage, and an upstream side of the valve body. And a fuse valve provided in the gas passage.

  The valve body is urged toward the downstream side of the gas passage by the main spring, and is seated on a valve seat provided at an end portion on the downstream side of the gas passage when the gas stopper is not used. As a result, the gas passage is closed by the valve body. The position of the valve body at this time is the first closed position. When the gas stopper is used, that is, when the socket is connected to the stopper body, the valve element is moved upstream by the push rod provided in the socket against the urging force of the main spring. Then, it is separated from the valve seat and is positioned at the first open position. As a result, the gas passage is opened, and the gas flowing through the gas passage is supplied from the socket to the gas appliance through the gas pipe.

  The fuse valve is urged upstream by a fuse spring consisting of a coil spring, so that the flow rate of the gas flowing in the gas passage is not only when the gas stopper is not used but also when it is in use. When it is within, it is positioned in the second open position by the fuse spring. On the other hand, when the flow rate of the gas flowing in the gas passage exceeds the normal range and becomes excessive, the fuse valve is moved downstream against the biasing force of the fuse spring by the pressure of the gas, and is provided in the valve body. It is seated on the fuse valve seat. As a result, the gas passage is closed. The position of the fuse valve when seated on the fuse valve seat is the second closed position.

  When the socket is removed from the plug body in a state where the fuse valve is seated on the fuse valve seat, the valve body is moved downstream from the first open position toward the first closed position by the main spring. Then, the fuse valve seated on the fuse valve seat is moved downstream together with the valve body by the gas. When the fuse valve moves downstream, the fuse spring is compressed. The fuse spring is constituted by a coil spring, and when the portions of the wire constituting the fuse spring separated by one pitch come into contact with each other, they cannot be further compressed and deformed. As a result, the fuse valve cannot move further downstream and stops. Then, the fuse valve moves to the upstream side relative to the valve body and is separated from the fuse valve seat. Once the fuse valve is separated from the fuse valve seat, it is returned to the second open position by the fuse spring.

Japanese Patent Laid-Open No. 2003-213541

  Since the coil spring constituting the fuse spring is formed of a thin metal wire, there is a risk of buckling if the coil spring is compressed and deformed until the portions of the wire separated by one pitch come into contact with each other. Once the fuse spring is buckled, part of the wire will be plastically deformed, and as a result, the biasing force of the fuse spring will change, or part of the wire will be entangled and the fuse spring will not return to its original state. There arises a problem that the fuse valve cannot be returned to the second open position.

In order to solve the above-described problem, the present invention provides a plug body in which a gas passage through which a gas flows is formed, a valve seat formed on the inner peripheral surface of the gas passage, and the above-described gas passage in the interior of the gas passage. A valve body movably provided between a first closed position seated on the valve seat and a first open position spaced upstream from the valve seat; and the valve body from the first open position to the first position. A main spring biased toward the closed position and seated on the valve seat; a fuse valve provided in the gas passage upstream of the valve body so as to be movable in the same direction as the valve body; A fuse spring provided between the stopper main body and the fuse valve and biasing the fuse valve toward the upstream side; and the valve body includes a gas passage located upstream from the valve seat. A separation part is provided to divide the interior into an upstream part and a downstream part. A communication hole for communicating the upstream portion and the downstream portion is formed, a fuse valve seat is provided on the inner peripheral surface of the communication hole, the fuse spring is a coil spring, and the fuse valve is When the flow rate of the gas flowing in the gas passage is within a predetermined appropriate range, the fuse spring is positioned at a second open position spaced upstream from the fuse valve seat, and the flow rate of the gas in the gas passage is With a fuse that is moved to the downstream side to the second closed position against the biasing force of the fuse spring by the gas flowing in the gas passage and becomes seated on the fuse valve seat when it becomes excessive beyond the appropriate range In the gas stopper, the fuse of the wire constituting the fuse spring is disposed inside the gas passage when the fuse valve moves downstream beyond the second closed position. It is characterized in that a stop for stopping the fuse valve before one pitch portion separated each other roots are in contact with each other.
In this case, the fuse valve has a valve portion that is seated on the fuse valve seat, and a guide shaft portion that is smaller in diameter than the valve portion and extends upstream from the valve portion, and the stop portion is the valve portion. And a guide hole through which the guide shaft portion is movably inserted. The guide hole is disposed upstream of the guide hole. At the upstream end of the guide shaft portion that protrudes to the side, a protrusion portion that protrudes in the radial direction of the guide shaft portion is provided, and the guide shaft portion that is located between the protrusion portion and the support portion The fuse spring for urging the fuse valve to the upstream side through the protruding portion is extrapolated, and the support portion extends from the support portion toward the upstream side, and an upstream tip portion is provided. Stop the fuse valve by hitting the protrusion. Support arm portion, it is preferably disposed so as to surround the fuse springs.

  According to the present invention having the above-described characteristic configuration, the fuse valve is stopped by the stop portion before the portions of the wire separated by one pitch come into contact with each other. In other words, portions of the wire constituting the fuse spring that are separated by one pitch do not contact each other. Therefore, the fuse spring has no risk of buckling. Therefore, it is possible to reliably prevent a situation in which a part of the wire is plastically deformed and the urging force of the fuse spring is changed, or a part of the wire is entangled and the fuse spring cannot be returned to the original state. Can do.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention in a state where a gas valve is located at a first closed position and a fuse valve is located at a second open position. 2 is a cross-sectional view taken along line XX of FIG. FIG. 3 is a cross-sectional view similar to FIG. 1 showing the same embodiment with the gas valve in the first open position and the fuse valve in the second open position. 4 is a cross-sectional view similar to FIG. 1 showing the same embodiment with the gas valve in the first open position and the fuse valve in the second closed position. FIG. 5 is a cross-sectional view similar to FIG. 1 showing the embodiment in a state where the fuse valve is seated on the fuse valve seat and the gas valve is moved by a slight distance from the first open position to the downstream side. is there. FIG. 6 is an exploded perspective view showing all the configurations of the embodiment in an exploded manner. FIG. 7 is an exploded perspective view showing a part of the embodiment assembled and unitized. FIG. 8 is a front view showing a holding member used in the embodiment. FIG. 9 is a cross-sectional view taken along line XX of FIG. FIG. 10 is a plan view of the support member used in the embodiment, and is a view seen from the X direction of FIG. FIG. 11 is a bottom view of the support member. 12 is a view as seen from the X direction of FIG. 13 is a cross-sectional view taken along line YY of FIG. FIG. 14 is a sectional view showing a second embodiment of the present invention.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 13 show a first embodiment of the present invention. As shown in FIGS. 1 to 5, the gas plug with fuse 1 of this embodiment includes a plug body 2, a gas valve 3, a holding member 4, a receiving member 5, and a fuse valve 6.

  The plug body 2 has an outer cylinder part 2A, an inner cylinder part 2B, and a connection cylinder part 2C. The outer cylinder part 2A, the inner cylinder part 2B, and the connecting cylinder part 2C are all formed as straight cylindrical bodies having both ends opened. Each of the cylindrical portions 2A to 2C does not necessarily have a circular cross section, and may have a noncircular cross section. A gas passage 2D through which gas flows is configured by the inside of the outer cylinder portion 2A, the inner cylinder portion 2B, and the connection cylinder portion 2C.

One end portion of the outer cylinder portion 2A (upstream end portion; right end portion in FIG. 1) For convenience of explanation, the structure of the gas plug 1 with a fuse will be described below with reference to the left and right of FIG. The invention is not limited to such directionality.) A tapered male screw portion 2a is formed on the outer peripheral surface. A primary gas pipe (not shown) is screwed and fixed to the taper male screw portion 2a. And gas is supplied to the right end part inside 2 A of outer cylinder parts from a primary side gas pipe. Therefore, the right end portion inside the outer cylinder portion 2A is the most upstream side of the gas passage 2D. In addition, it may replace with the taper external thread part 2a, and may form a straight external thread part, and may form a taper internal thread part or a straight internal thread part in the edge part by the side of the opening part of the internal peripheral surface of 2 A of outer cylinder parts.

  A small-diameter portion (inner tube portion) 2b occupying most of the inner cylinder portion 2B is formed on the right end side of the inner cylinder portion 2B, and an outer diameter and an inner diameter are smaller than those of the small diameter portion 2b at the other end portion. Large diameter portions 2c each having a large diameter are formed. The small diameter portion 2b and the large diameter portion 2c are arranged coaxially. A step surface 2d is formed between the inner peripheral surface of the small diameter portion 2b and the inner peripheral surface of the large diameter portion 2c. A flange portion 2e is formed in an annular shape at the left end adjacent to the large diameter portion 2c of the small diameter portion 2b. The outer diameter of the flange part 2e is larger than the outer diameter of the large diameter part 2c.

The small diameter portion 2b is inserted into the outer cylinder portion 2A from the left end opening. The left end portion of the small diameter portion 2b is screwed into the left end opening portion of the outer cylinder portion 2A. And the inner cylinder part 2B is being fixed to 2 A of outer cylinder parts by screwing until the flange part 2e hits the left end surface of 2 A of outer cylinder parts. In addition, although the screwing location of the small diameter part 2b and the outer cylinder part 2A is sealed with the adhesive agent, you may seal with sealing members, such as an O-ring.

The small diameter part 2b is arranged coaxially with the outer cylinder part 2A. In addition, the portion of the small diameter portion 2b excluding the screwed portion with the outer cylindrical portion 2A has a smaller diameter than the inner diameter of the outer cylindrical portion 2A. As a result, an annular gap 2E is formed between the outer peripheral surface of the small diameter portion 2b and the inner peripheral surface of the outer cylinder portion 2A. Of course, this gap 2E also constitutes a part of the gas passage 2D.

A communication hole 2f is formed in the peripheral wall portion of the small diameter portion 2b so as to penetrate the small diameter portion 2b in the radial direction. The communication hole 2f is disposed adjacent to the screwed portion between the small diameter portion 2b and the outer cylinder portion 2A. Accordingly, the outer opening of the communication hole 2f faces the left end of the gap 2E. That is, the communication hole 2f communicates with the left end portion of the gap 2E. Therefore, the gas supplied to the outer cylinder portion 2A flows into the inner cylinder portion 2B through the communication hole 2f. As will be described later, the right end opening in FIG. 1 of the small diameter portion 2 b is closed by the holding member 4. Therefore, the gas that has flowed into the outer tube portion 2A flows into the inner tube portion 2B only through the communication hole 2f.

The large-diameter portion 2c protrudes leftward from the outer cylinder portion 2A. The right end portion of the connecting tube portion 2C is screwed and fixed to the inner periphery of the large diameter portion 2c. Therefore, the gas that has flowed into the inner tube portion 2B flows into the connecting tube portion 2C from the opening at the other end of the inner tube portion 2B. On the outer peripheral surface on the left end side of the connecting cylinder portion 2C, a plug portion 2g having a size and a shape defined by Japanese Industrial Standard (JIS S 2135) is formed. When the gas stopper 1 is used, a socket (not shown) defined by the same standard is externally connected to the plug portion 2g. Therefore, the gas that has flowed into the outer cylinder portion 2A flows into the socket through the inside of the inner cylinder portion 2B and the connection cylinder portion 2C, and further to a gas device (not shown) via a gas pipe connected to the socket. Supplied. In addition, although the screwing location of the large diameter part 2c and the connection cylinder part 2C is sealed with the adhesive agent, you may seal with sealing members, such as an O-ring. Also, the structure of the socket is well known, and its relevance to the present invention is low, so its description is omitted.

As described above, the small-diameter portion 2b is provided in the middle portion in the longitudinal direction of the gas passage 2D. As a result, the gas passage 2D is divided into a first portion 2F located upstream from the small diameter portion 2b and a second portion 2G located downstream from the small diameter portion 2b. In this gas stopper 1, the inside of the outer cylinder part 2A is the first part 2F, and the inside of the connecting cylinder part 2C is the second part 2G. The first portion 2F and the second portion 2G are communicated with each other through the communication hole 2f and the small diameter portion 2b.

  A straight hole 2h extending from the right end to the substantially central portion is formed inside the connecting cylinder portion 2C. The straight hole portion 2h is arranged with its axis aligned with the axis of the connecting cylinder portion 2C. Therefore, the axis of the straight hole portion 2h also coincides with the axis of the inner cylinder portion 2B (the axis of the small diameter portion 2b). The inner diameter of the straight hole portion 2h is larger than the inner diameter of the small diameter portion 2b. A concave portion extending in an annular shape is formed at the right end portion of the inner peripheral surface of the straight hole portion 2h. The recess is open on the right side in FIG. 1, but the open side is closed by a step surface (first contact portion) 2d. As a result, a mounting recess 2i having a U-shaped cross section in which the left and right sides are closed by the recess and the stepped surface is formed. A seal member 7 is mounted in the mounting recess 2i.

  The seal member 7 is made of a resin having flexibility such as rubber and is formed in a circular ring shape. The seal member 7 has a substantially “V” cross section, and its width (the dimension in the axial direction of the seal member 7) increases as it goes radially inward. The cross-sectional shape of the seal member 7 is not limited to the “V” shape, and may be a “U” cross section, or a hollow or solid circle. The outer diameter of the seal member 7 is desirably larger than the diameter of the bottom surface of the mounting recess 2i so that the outer periphery thereof is in press contact with the bottom surface of the mounting recess 2i, but is equal or larger than the inner diameter of the straight hole 2h. As long as it is a diameter, it may be slightly smaller than the diameter of the bottom surface of the mounting recess 2i. The inner diameter of the seal member 7 is smaller than the inner diameter of the straight hole 2h. Therefore, the inner peripheral portion of the seal member 7 protrudes inward from the mounting recess 2i. The width of the seal member 7 may be determined so that it can move in the axial direction of the straight hole 2h with respect to the mounting recess 2i, or may be determined so that it cannot move. In the latter case, one side of the seal member 7 in the axial direction of the straight hole 2h is always in contact with the stepped surface 2d, and the other side is always in contact with one side (the left side in FIG. 1) of the mounting recess 2i. To do.

A valve seat 2j is formed in an annular shape on the inner peripheral surface of the connecting cylinder portion 2C. The valve seat 2j is disposed on the left side (downstream side of the gas passage 2D) from the straight hole 2h. The valve seat 2j is configured by a tapered surface having a smaller diameter toward the left, and is disposed coaxially with the straight hole 2h. The maximum inner diameter of the valve seat 2j is smaller than the inner diameter of the straight hole 2h. The valve seat 2j may be configured by an arc surface or other curved surface instead of the tapered surface.

A gas valve 3 is inserted into the inner cylinder part 2B and the connection cylinder part 2C so as to be movable in the longitudinal direction of the inner cylinder part 2B and the connection cylinder part 2C (longitudinal direction of the gas passage 2D). The gas valve 3 includes a right upstream valve portion 3A and a left downstream valve portion (valve element) 3B. The upstream valve portion 3A and the downstream valve portion 3B are configured separately from each other. However, both move together except in the case described later. Therefore, the upstream valve portion 3A and the downstream valve portion 3B may be integrally formed.

  The upstream valve portion 3A is configured by a metal cylinder that is open at both ends. As shown in FIGS. 6 and 7, a slit 3a extending from one end to the other end in the longitudinal direction is formed on one side in the circumferential direction of the upstream valve portion 3A. Thereby, the upstream valve portion 3A is formed in a C-shaped cross section, and can be elastically expanded and contracted. The outer diameter of the upstream valve portion 3A is set larger than the inner diameter of the inner cylinder portion 2B by a predetermined dimension. Accordingly, the upstream valve portion 3A is inserted into the inner cylinder portion 2B in an elastically reduced diameter state, and the outer peripheral surface of the upstream valve portion 3A is formed by the elastic force of the upstream valve portion 3A itself. It is pressed against the inner peripheral surface of 2B. Moreover, the upstream valve portion 3A is inserted into the inner cylinder portion 2B so as to be slidable in the longitudinal direction (longitudinal direction of the gas passage 2D). The upstream valve portion 3A is movable (slidable) between a first closed position shown in FIG. 1 and a first open position shown in FIG.

  The upstream valve portion 3A is inserted into the inner cylinder portion 2B with the slit 3a being 180 degrees away from the communication hole 2f in the circumferential direction of the inner cylinder portion 2B. A recess 2k is formed at a location facing the slit 3a on the inner peripheral surface of the inner cylindrical portion 2B. A spherical body 8 is inserted into the recess 2k in a state where a part of the sphere 8 protrudes into the inner cylindrical portion 2B. A part of the sphere 8 protruding inside the inner cylinder portion 2B is inserted into the slit 3a so as to be relatively movable in the longitudinal direction and immovable in the circumferential direction of the upstream valve portion 3A. As a result, the upstream valve portion 3A can move in the longitudinal direction with respect to the inner cylinder portion 2B, but is fixed in the circumferential direction.

  A notch 3b is formed at the left end (downstream end) of the upstream valve portion 3A. This notch portion 3b is disposed at the same position as the communication hole 2f in the circumferential direction of the inner cylinder portion 2B. As shown in FIG. 3, the communication hole is formed when the upstream valve portion 3A is positioned at the first open position. Opposite to 2f. Moreover, the notch 3b has a size slightly larger than the communication hole 2f, and when the upstream valve portion 3A is located at the first open position, the peripheral edge of the notch 3b surrounds the communication hole 2f. Located on the outside. Therefore, when the upstream valve portion 3A is located at the first open position, the gas flowing into the communication hole 2f passes through the cutout portion 3b without hitting the peripheral wall portion of the upstream valve portion 3A. It flows into the left end (downstream end).

As shown in FIG. 1, the notch 3b is positioned on the left side of the communication hole 2f when the upstream valve portion 3A moves to the first closed position. Therefore, when the upstream valve portion 3A moves to the first closed position, the right end portion of the peripheral wall portion of the upstream valve portion 3A faces the communication hole 2f and closes it. In addition, as described above, the outer peripheral surface of the upstream valve portion 3A is in pressure contact with the inner peripheral surface of the inner cylinder portion 2B by the elasticity of the upstream valve portion 3A itself, so the opening inside the communication hole 2f is The upstream valve portion 3A is securely closed. Therefore, when the upstream valve portion 3A is located at the first closed position, the outer cylinder portion 2A and the inner cylinder portion 2B are disconnected. That is, the gas passage 2D is closed and the gas plug 1 is closed.

Next, for convenience of explanation, the holding member 4 will be described before explaining the downstream valve portion 3B. As shown in FIGS. 8 and 9, the holding member 4 has a bottom portion 4a at the right end portion thereof, and the left end portion. Is opened. That is, the holding member 4 is formed in a bottomed cylindrical shape. As shown in FIGS. 1 to 5, the holding member 4 is inserted from the right end opening into the small diameter portion 2b with the opening first, and the right end is the right end opening of the small diameter portion 2b. Are screwed and fixed. As a result, the right end opening of the small diameter portion 2 b is closed by the holding member 4. Accordingly, the gas in the outer cylinder portion 2A flows only into the inner cylinder portion 2B through the communication hole 2f. In addition, although the screwing location of the holding member 4 and the small diameter part 2b is sealed with the adhesive agent, you may seal with sealing members, such as an O-ring.

The outer diameter of the portion of the holding member 4 excluding the bottom portion 4a is smaller than the inner diameter of the inner cylinder portion 2B. As a result, an annular gap 9 is formed between the outer peripheral surface of the holding member 4 and the inner peripheral surface of the inner cylinder portion 2B. The right end portion of the upstream valve portion 3A is inserted into the left end portion of the annular gap 9 so as to be movable in the left-right direction. Between the upstream valve portion 3A and the bottom portion 4a, a main spring 10 as an urging means comprising a coil spring is disposed. The right end portion of the main spring 10 is in contact with the bottom portion 4 a of the holding member 4, and the left end portion is in contact with the upstream valve portion 3 </ b> A via the ring 11. Accordingly, the upstream valve portion 3A is urged leftward from the first open position toward the first closed position by the main spring 10, and is positioned at the first closed position when the gas stopper 1 is not used. Yes.

  As shown in FIG. 3, when the upstream valve portion 3A is positioned at the first open position, the left end portion of the holding member 4 is notched portion 3b (hereinafter, the upstream valve portion 3A is positioned at the open position). The cutout portion 3b when extending is called “the cutout portion 3b in the open position” and extends to the left side of the cutout portion 3b. Therefore, the left end portion of the peripheral wall portion of the holding member 4 faces the notch portion 3b in the open position. A window hole 4b (see FIG. 8) is formed in the peripheral wall portion of the holding member 4 facing the notch portion 3b in the open position. The window hole 4b has a size slightly larger than the notch 3b, and is arranged so as to surround the notch 3b in the open position. Therefore, the gas that has passed through the communication hole 2f and the notch 3b immediately flows into the window hole 4b and then flows into the holding member 4 from the window hole 4b. The gas that has flowed into the holding member 4 flows from the left end opening of the holding member 4 into the left end of the upstream valve portion 3A. Two window holes 4b are formed 180 degrees apart in the circumferential direction. This is to ensure that one of the two window holes 4b always faces the notch 3b in the open position. Only one window hole 4b may be formed.

Next, the downstream valve portion 3B will be described. The downstream valve portion 3B has a cylindrical portion (separation portion) 3c that has a cylindrical shape. The outer diameter of the cylindrical portion 3c is set to be substantially the same as the inner diameter of the small diameter portion 2b. The right end portion (upstream end portion) of the cylindrical portion 3c is slidably inserted into the left end portion of the inner peripheral surface of the small diameter portion 2b. The right end surface of the cylindrical portion 3c is abutted against the left end surface of the upstream valve portion 3A. Accordingly, the cylindrical portion 3c (downstream valve portion 3B) is biased leftward by the main spring 10 via the upstream valve portion 3A, and normally moves together with the upstream valve portion 3A. Therefore, when the upstream valve portion 3A moves to the first closed position, the downstream valve portion 3B also moves to the first closed position, and when the upstream valve portion 3A moves to the first open position, the downstream valve portion 3B also Move to the first open position.

The inside of the cylindrical portion 3c is a passage hole (communication hole) 3d. The passage hole 3d passes through the central portion of the cylindrical portion 3c from the right end surface to the left end surface. Gas that flows out from the upstream side valve portion 3A to the left flows into the right end opening of the passage hole 3d. In particular, in this embodiment, since the right end surface of the cylindrical portion 3c is in contact with the left end surface of the upstream valve portion 3A, the gas in the upstream valve portion 3A flows directly into the passage hole 3d. A ring or the like may be interposed between the tube portion 3c and the upstream valve portion 3A. The gas that has flowed into the passage hole 3d flows out of the left end opening of the passage hole 3d and flows into the straight hole 2h of the connection cylinder portion 2C. That is, the gas that flows out from the left end opening of the passage hole 3d flows into the gas passage 2D that is located downstream of the cylinder portion 3c and upstream of the valve seat 2j.

The downstream portion of the cylindrical portion 3c is inserted into the straight hole portion 2h of the connecting cylindrical portion 2C. The inner diameter of the straight hole portion 2h is larger than the inner diameter of the small diameter portion 2b. Therefore, an annular gap 12 is formed between the outer peripheral surface of the cylindrical portion 3c and the inner peripheral surface of the straight hole portion 2h.

An annular protrusion 3e is formed at the downstream end of the outer peripheral surface of the cylindrical portion 3c. The outer diameter of the annular protrusion 3e is equal to or slightly smaller than that of the straight hole 2h, and is inserted into the inner peripheral surface of the straight hole 2h so as to be movable in the left-right direction. As shown in FIG. 3, when the upstream valve portion 3A and the downstream valve portion 3B move to the first open position, the annular protrusion 3e hits the seal member 7 and pushes it in the axial direction of the connecting cylinder portion 2C. The step surface 2d is pressed and contacted. In other words, when the upstream side valve portion 3A and the downstream side valve portion 3B move to the first open position, the left and right side portions in FIG. 3 of the seal member 7 are in press contact with the annular projecting portion 3e and the step surface 2d, respectively. As a result, the gap between the stepped surface 2d and the annular projecting portion 3e is sealed by the seal member 7, and as a result, the gap between the inner peripheral surface of the straight hole 2h (gas passage 2D) and the outer peripheral surface of the downstream valve portion 3B. Sealed by the seal member 7. Moreover, when the seal member 7 is crushed, the seal member 7 is elastically deformed to expand its diameter, and the outer peripheral portion thereof is more strongly pressed against the bottom surface of the mounting recess 2i. Thereby, the space between the inner peripheral surface of the straight hole portion 2h and the outer peripheral surface of the downstream valve portion 3B is more reliably sealed.

Thus, when the downstream valve portion 3B is moved to the first open position, the space between the outer peripheral surface of the cylindrical portion 3c and the inner peripheral surface of the straight hole portion 2h is sealed, so that the upstream side from the valve seat 2j. The interior of the gas passage 2D is divided into an upstream part 2H located upstream from the cylinder part 3c and a downstream part 2I located downstream from the cylinder part 3c. The upstream portion 2H and the downstream portion 2I communicate with each other only through the passage hole 3d when the downstream valve portion 3B is located at the first open position. Therefore, the gas passage 2D can be opened and closed by opening and closing the passage hole 3d.

A fuse valve seat 3f is formed on the inner peripheral surface of the passage hole 3d. The fuse valve seat 3f is disposed in the middle portion in the longitudinal direction of the passage hole 3d, but may be disposed so as to be in contact with the opening on the left side of the passage hole 3d. The fuse valve seat 3f is formed by a tapered surface whose axis is aligned with the axis of the cylindrical portion 3c, and has a smaller diameter toward the left. The fuse valve seat 3f may be formed of a spherical surface or other curved surface that protrudes outward instead of the tapered surface.

  Two support arm portions 3g extending toward the left side are formed on the left end surface of the cylindrical portion 3c. The two support arm portions 3g are arranged 180 degrees apart from each other in the circumferential direction of the cylindrical portion 3c. Accordingly, the gas flowing out from the cylindrical portion 3c flows through the gap formed between the two support arm portions 3f and 3f into the connection cylindrical portion 2C (inside the straight hole portion 2h) without resistance. A valve portion 3h is formed at the tip of the support arm portions 3g, 3g. When the downstream valve portion 3B is located at the first open position, the valve portion 3h is separated to the right side (upstream side) with respect to the valve seat 2j, but the upstream valve portion 3A and the downstream valve portion When 3B is moved to the first closed position by the main spring 10, it is seated on the valve seat 2j. In other words, the first closed positions of the upstream valve portion 3A and the downstream valve portion 3B are determined by the valve portion 3h being seated on the valve seat 2j. When the valve portion 3h is seated on the valve seat 2j, the gas passage 2D is closed and the gas stopper 1 is closed.

  When the socket is extrapolated to the plug portion 2g in the state where the upstream valve portion 3A and the downstream valve portion 3B are in the first closed position, as shown in FIG. 3, the push rod R provided in the socket Hits the left end surface of the valve portion 3h and moves the downstream valve portion 3B and the upstream valve portion 3A to the right side (upstream side) against the urging force of the main spring 10. When the socket is extrapolated to the plug portion 2g to a predetermined connection position, the downstream valve portion 3B and the upstream valve portion 3A move to the predetermined position. The positions of the downstream valve portion 3B and the upstream valve portion 3A at this time are the first open position. In a state where the downstream side valve portion 3B and the upstream side valve portion 3A are located at the first open position, the distal end portion of the holding member 4 enters the cylindrical portion 3c of the downstream side valve portion 3B. Therefore, the gas that has flowed into the holding member 4 from the communication hole 2f through the notch 3b and the window hole 4a does not enter the upstream valve portion 3A, but enters the passage hole 3d of the downstream valve portion 3B. Directly into the straight hole portion 2h of the connecting tube portion 2C through the passage hole 3d. And it flows in into a socket from 2C of connection cylinder parts, and is supplied to a gas appliance.

  When the socket is removed from the plug portion 2g, the push rod R moves to the left. As a result, the upstream valve portion 3A and the downstream valve portion 3B are moved to the left side (downstream side) by the main spring 10. When the valve portion 3h is seated on the valve seat 2j, the upstream side valve portion 3A and the downstream side valve portion 3B can move further to the left and stop. That is, it stops at the first closed position. When the upstream valve portion 3A and the downstream valve portion 3B are stopped at the first closed position, the communication hole 2f is closed by the upstream valve portion 3A, and the downstream end of the gas passage 2D is closed by the valve portion 3g. . As a result, the gas stopper 1 is closed.

  Between the left end portion of the holding member 4 and the downstream valve portion 3B, a secondary spring 13 is provided as an urging means including a coil spring. The auxiliary spring 13 urges the downstream valve portion 3B to the left side (downstream side). Therefore, even if the upstream valve portion 3A stops due to an accident during the movement from the first open position to the first closed position, the downstream valve portion 3B is moved to the first closed position by the auxiliary spring 13. Then, the gas passage 2D is closed. Thereby, the safety | security of the gas stopper 1 is improved.

  As shown in FIGS. 1 and 2, when the upstream valve portion 3A and the downstream valve portion 3B are located at the first closed position, the distal end portion of the holding member 4 is located on the right side of the downstream valve portion 3B. And only enters the upstream valve portion 3A. As shown in FIG. 3, when the upstream side valve portion 3A and the downstream side valve portion 3B are located at the first open position, the holding member 4 is relatively leftward with respect to the upstream side valve portion 3A and the downstream side valve portion 3B. As a result, the tip of the holding member 4 passes through the upstream valve portion 3A and enters the downstream valve portion 3B. However, this configuration is not necessarily required, and the distal end portion of the holding member 4 may always be positioned inside the upstream valve portion 3A or the downstream valve portion 3B.

  A receiving member (stop portion) 5 is fixedly provided inside the distal end portion of the holding member 4. A fuse valve 6 is supported on the receiving member 5.

That is, as shown in FIGS. 6 and 10 to 13, the receiving member 5 has a cylindrical section 5 a having a circular cross section with both ends opened. The cylindrical portion 5 a is fitted and fixed to the distal end portion of the inner peripheral surface of the holding member 4 in a state where the axis thereof is coincident with the axis of the holding member 4. The right end surface of the cylindrical portion 5a is disposed on the left side (downstream side) from the window hole 4b. Therefore, the gas that has flowed into the holding member 4 through the window hole 4b flows into the cylinder portion 5a, and flows into the passage hole 3d of the downstream valve portion 3B through the cylinder portion 5a.

  A plurality (three in this embodiment) of supporting arm portions (stop portions) 5b extending toward the right side (upstream side) are provided on the right end surface of the cylindrical portion 5a. The support arm portions 5b are arranged apart from each other in the circumferential direction. Therefore, a gap is formed between the support arm portions 5b and 5b, and the gas flowing into the holding member 4 from the window hole 4b enters the cylinder portion 5a through the gap.

  A support tube portion (support portion) 5c is provided at the intermediate portion in the longitudinal direction of the support arm portion 5b. The support cylinder portion 5c is arranged with its axis line coincided with the axis line of the cylinder portion 5a. As shown in FIGS. 3 and 4, the left end surface of the support cylinder portion 5 c is disposed so as to be located at substantially the same position as the left end surface of the upstream valve portion 3 </ b> A when located at the first open position. Yes. Accordingly, the left end surface of the support cylinder portion 5c is positioned slightly on the left side (downstream side) from the left end of the communication hole 2f, and is positioned slightly on the right side with respect to the left end surface of the window hole 4b. The right end surface of the support cylinder portion 5c is arranged so as to coincide with the substantially center in the left-right direction of the communication hole 2f, but may be arranged upstream from the center of the communication hole 2f, or arranged downstream. Also good.

  A fuse valve 6 is supported on the support cylinder portion 5c so as to be movable in the left-right direction. The fuse valve 6 has a mushroom shape with a long handle, and is a substantially hemispherical fuse valve portion 6a curved so as to bulge toward the left side, and rightward from the center of the right end surface of the fuse valve portion 6a. And a guide shaft portion 6b extending toward the front.

  The fuse valve portion 6a has a position where the right end surface (upstream end surface) abuts against the left end surface (downstream end surface) of the support cylinder portion 5c and the downstream valve portion 3B located at the first open position. It can move between the positions shown in FIG. 4 seated on the fuse valve seat 3f. The position of the fuse valve 6 when the right end surface of the fuse valve portion 6a abuts against the left end surface of the support cylinder portion 5c is the second open position, and the fuse valve portion 6a is seated on the fuse valve seat 3f. The position of the fuse valve 6 is the second closed position. When the fuse valve 6 is located at the second open position, the right end portion of the fuse valve portion 6a is located slightly to the left (downstream side) from the center of the communication hole 2f. The fuse valve portion 6a may be disposed so that the entire fuse valve portion 6a is located downstream of the communication hole 2f when the fuse valve 6 is located at the second open position. However, when the gas in the holding member 6 flows into the cylindrical portion 5a of the receiving member 5, it is necessary to consider so that the fuse valve portion 6a does not have a large resistance to the flowing gas.

  The guide shaft portion 6b has a length sufficiently longer than the support cylinder portion 5c, and is inserted in the support cylinder portion 5c, that is, in the guide hole 5d so as to be movable in the left-right direction. Moreover, the tip end portion (upstream end portion) of the guide shaft portion 6b extends to the upstream side beyond the support arm portion 5b. By inserting the guide shaft portion 6b into the support cylinder portion 5c, the fuse valve 6 can move on the axis of the upstream valve portion 3A and the downstream valve portion 3B.

  A retaining ring 14 is fixed to the distal end portion of the guide shaft portion 6b that extends upstream (right side) beyond the support arm portion 5b. The retaining ring 14 is disposed so as to abut against the front end surface of the support arm portion 5b when the fuse valve 6 moves downstream by a slight distance (for example, about 2 to 5 mm) beyond the second closed position. . When the retaining ring 14 hits the support arm portion 5b, the fuse valve 6 cannot move further downstream and stops.

  A fuse spring 15 made of a coil spring is provided on the guide shaft portion 6b located between the retaining ring 14 and the support cylinder portion 5c. One end portion (upstream end portion) of the fuse spring 15 abuts against the retaining ring 14 and the other end portion (downstream end portion) abuts the support cylinder portion 5c. Therefore, one end of the fuse spring 15 is located upstream of the support arm 5b. On the other hand, the other end portion of the fuse spring 15 is surrounded by a plurality (three in this embodiment) of supporting arm portions 5b. The outer diameter of the coil portion of the fuse spring 15 is set to be substantially the same as or slightly smaller than the diameter of the inscribed circle inscribed in the support arm portion 5b.

  The fuse spring 15 urges the guide shaft portion 6b to the right via the retaining ring 14, and thus urges the fuse valve 6 in the direction from the second closed position to the second open position. The fuse valve 6 is normally positioned at the second open position by the fuse spring 15.

  The urging force of the fuse spring 15 prevents the fuse valve 6 from moving from the second open position to the second closed position when the flow rate of the gas flowing in the gas passage 2D is within a normal range or less, and the gas When the flow rate exceeds the normal range, the size is set so as to allow the fuse valve 6 to move from the second open position to the second closed position by the gas. Therefore, when the socket is connected to the plug portion 2g, that is, when the gas plug 1 is opened, when the flow rate of the gas flowing through the gas passage 2D is normal, the fuse valve portion 6a is The fuse valve 6 is positioned at the second open position by being pressed against the left end surface of the support cylinder portion 5c. On the other hand, when the flow rate of the gas flowing in the gas passage 2D becomes excessive, for example, when the gas pipe connected to the socket is disconnected from the socket or the gas appliance and the flow rate of the gas flowing in the gas passage 2D becomes excessive. The fuse valve 6 is moved from the second open position to the second closed position against the biasing force of the fuse spring 15 by the gas pressure, and the fuse valve portion 6a is seated on the fuse valve seat 3f. As a result, the passage hole 3d of the downstream valve portion 3B is closed, and consequently the gas passage 2D is closed. Therefore, accidents such as gas leakage can be prevented in advance.

  If the seal member 7 is not provided, the gas in the upstream portion 2H is caused by the gap between the inner peripheral surface of the inner cylindrical portion 2B and the outer peripheral surface of the cylindrical portion 3c, or the inner peripheral surface of the straight hole portion 2h. Flows into the downstream portion 2I through a gap 12 (see FIG. 1) between the pipe portion 3c and the outer peripheral surface of the cylindrical portion 3c and a gap between the inner peripheral surface of the straight hole 2h and the outer peripheral surface of the annular protrusion 3e. However, there is a risk of leakage to the outside through the socket. However, in the gas plug 1 with a fuse, when the downstream valve portion 3B is located at the first open position and the fuse valve 6 is located at the second closed position, the outer peripheral surface of the cylindrical portion 3c and the straight hole portion The space between the inner peripheral surface of 2h is sealed by a seal member 7. Therefore, it is possible to reliably prevent the gas from leaking when the fuse valve 6 is located at the second closed position.

  The pitch of the fuse spring 15 and the diameter of the wire constituting the fuse spring 15 are not limited to when the fuse valve 6 is located at the second closed position, but the fuse valve 6 slightly moves downstream beyond the second closed position. Even if it does, it is determined so that the parts which adjoin between 1 pitch of a wire may not contact. That is, when the fuse valve 6 is moved from the second open position to the second closed position, the fuse spring 15 is compressed by an amount corresponding to the movement distance. However, at this time, adjacent portions between one pitch of the wire constituting the fuse spring 15 do not come into contact with each other.

  When the socket is moved in the direction of coming out of the plug portion 2g in the state where the downstream valve portion 3B is located at the first open position and the fuse valve 6 is located at the second closed position, the downstream side is accordingly The valve portion 3B (and the upstream valve portion 3A) is moved to the downstream side by the main spring 10. Then, the fuse valve 6 seated on the fuse valve seat 3f is pushed by the gas and moved to the downstream side together with the downstream valve portion 3B. When the fuse valve 6 moves to the downstream side by a slight distance of about 2 to 5 mm, for example, the retaining ring 14 hits the tip surface (right end surface) of the support arm portion (stop portion) 5b of the receiving member 5 and further downstream. It becomes impossible to move to. Accordingly, thereafter, only the downstream valve portion 3B and the upstream valve portion 3A are moved downstream to the first closed position by the main spring 10. On the other hand, the fuse valve 6 separated from the fuse valve seat 3 f is returned to the second open position by the fuse spring 15.

  When the fuse valve 6 is stopped by the retaining ring 14 hitting the support arm 5b, the fuse spring 15 is compressed most. However, even in this state, the pitch of the fuse spring 15 and the diameter of the wire constituting the fuse spring 15 are determined so that adjacent portions do not contact each other between one pitch of the wire constituting the fuse spring 15. ing. Therefore, the fuse spring 15 does not buckle. Therefore, it is possible to reliably prevent a part of the fuse spring 15 from being plastically deformed to change its urging force, or the adjacent portions of the wire to be entangled with each other so that the original state cannot be restored. be able to.

  As is apparent from a comparison between FIG. 6 and FIG. 7, the fuse-equipped gas stopper 1 having the above-described configuration can be assembled as follows. First, the inner cylinder part 2B, the connection cylinder part 2C, the seal member 7 and the downstream valve part 3B are assembled into a unit. Further, the holding member 4, the receiving member 5, the fuse valve 6, the fuse spring 15 and the retaining ring 14 are assembled into a unit.

  When unitizing the inner cylinder portion 2B, the connecting cylinder portion 2C, the seal member 7 and the downstream valve portion 3B, first, the seal member 7 and the downstream valve portion 3B are moved from the left end opening of the large diameter portion 2c of the inner cylinder portion 2B. Then, the connecting tube portion 3C is screwed and fixed to the large diameter portion 2c. Thereby, the inner cylinder part 2B, the connection cylinder part 2C, the seal member 7, and the downstream valve part 3B can be unitized.

  When unitizing the holding member 4, the receiving member 5, the fuse valve 6, the fuse spring 15 and the retaining ring 14, first, the guide shaft portion 6 b of the fuse valve 6 is inserted into the cylindrical portion 5 a of the receiving member 5. Thereafter, the fuse spring 15 is extrapolated to the guide shaft portion 6b protruding rightward from the cylindrical portion 5a, and the retaining ring 14 is fixed to the right end portion of the guide shaft portion 6b. Thus, the fuse valve 6, the fuse spring 15 and the retaining ring 14 are assembled to the receiving member 5 on the receiving member 5. Thereafter, the receiving member 5 assembled with the fuse valve 6, the fuse spring 15 and the retaining ring 14 is inserted from the left end opening of the holding member 4, and the cylindrical portion 5 a of the receiving member 5 is fitted into the left end opening of the holding member 4. Fix it together. Accordingly, the holding member 4, the receiving member 5, the fuse valve 6, the fuse spring 15 and the retaining ring 14 can be unitized.

  Thereafter, the auxiliary spring 12, the upstream valve portion 3A, the ring 11 and the main spring 10 are sequentially inserted into the unitized inner cylinder portion 2B from the right end opening, and the unitized holding member 4 is further inserted. . Then, the holding member 4 is screwed and fixed to the inner cylinder portion 2B. Thereafter, the small diameter part 2b of the inner cylinder part 2B is inserted into the outer cylinder part 2A and fixed by screwing. This completes the assembly of the fused gas plug 1. As will be apparent from the above, when assembling the gas plug with fuse 1, several parts can be handled as a unit, so that the assembly can be easily performed.

  In the gas plug with a fuse 1 having the above configuration, even when the fuse spring 15 is most compressed, adjacent portions between one pitch of the wire constituting the fuse spring 15 do not contact each other. Therefore, it is possible to prevent the fuse spring 15 from buckling. Therefore, it is possible to reliably prevent a situation in which a part of the fuse spring 15 is plastically deformed and the urging force thereof is changed, or adjacent portions of the wire are entangled and cannot return to the original state. Can be prevented.

  In particular, in this embodiment, since the fuse spring 15 is surrounded by the plurality of support arm portions 5b, it is possible to more reliably prevent the fuse spring 15 from buckling.

  Further, in the gas plug with fuse 1 of this embodiment, since the fuse valve seat 3f is provided in the passage hole 3d of the downstream valve portion 3B, when the fuse valve 6 is seated on the fuse valve seat 3f, At least the downstream end portion of the fuse valve 6 including the valve portion 6a enters the downstream valve portion 3B. The length of the gas passage 2D can be shortened by the amount that the fuse valve 6 enters the downstream valve portion 3B, and the length of the plug body 2 can be shortened. Therefore, the length of the gas plug 1 with a fuse can be shortened.

  Furthermore, in this embodiment, since the gas passage 2D is closed by the upstream valve portion 3A and the downstream valve portion 3B, the gas passage 2D can be reliably closed. Moreover, since the fuse valve 6 is inserted into the upstream valve portion 3A, the length of the plug body 2 is made shorter than when the two valve portions 3A and 3B and the fuse valve 6 are arranged in a line. can do. Therefore, the reliability of the closed state of the gas plug with fuse 1 can be improved, and the length of the gas plug 1 can be shortened.

  FIG. 14 shows a second embodiment of the present invention. In the gas plug with a fuse 1 ′ according to this embodiment, an outer cylinder portion 2A ′ is used instead of the outer cylinder portion 2A according to the above embodiment. The outer cylinder portion 2A ′ is divided into two forks on the downstream side, and two branch cylinder portions 2J and 2K are formed at the downstream end. The two branch cylinder portions 2J and 2K extend in parallel to each other, and are also parallel to the upstream end portion of the outer cylinder portion 2A ′. The two branch cylinder portions 2J and 2K are not necessarily parallel to each other. For example, the two branch cylinder portions 2J and 2K may be inclined with respect to each other so as to be separated from each other toward the downstream side, or may be inclined with respect to the upstream end portion of the outer cylinder portion 2A ′. . Of the upstream end portions of the two branch tube portions 2J and 2K, the side portions adjacent to each other are in communication with the upstream end portion of the outer tube portion 2A ′.

  Inner tube portions 2B and 2B are screwed and fixed to the downstream end portions of the branch tube portions 2J and 2K, respectively. A connecting tube portion 2C is screwed and fixed to each inner tube portion 2B. And inside the inner cylinder part 2B and the connecting cylinder part 2C, each component such as the gas valve 3, the holding member 4, the receiving member 5 and the fuse valve 6 is accommodated in the same manner as in the above embodiment. The configuration is the same as in the above embodiment. Therefore, only the same reference numerals as those assigned to the corresponding configurations in the above-described embodiments are attached to the configurations, and the description thereof is omitted.

In addition, this invention is not limited to said embodiment, A various modification is employable in the range which does not deviate from the summary.
For example, in the above-described embodiment, the flange portion 2e and the large diameter portion 2c of the inner cylinder portion 2B are projected outward from the outer cylinder portion 2A. For example, the left end surface of the inner cylinder portion 2B is the outer cylinder portion 2A. The entire inner cylinder portion 2B may be inserted into the outer cylinder portion 2A so as to coincide with the left end surface of the outer cylinder portion 2B. Also in this case, the connecting tube portion 2C is screwed and fixed to the left end opening of the inner tube portion 2B.
In the above embodiment, the gas plug 1 with fuse is opened and closed, the gas passage 2D is opened and closed by the upstream valve portion 3A, the communication hole 2f is opened, and the valve seat of the valve portion 3h of the upstream valve portion 3B. It is performed by sitting on 2j and opening / closing by separation, but the former may be omitted.
Further, in the above-described embodiment, the holding member 4 is provided in the inner cylinder portion 2B, and the fuse valve 6 is movably held by the holding member 4, but the fuse valve 6 is directly held by the inner cylinder portion 2B. You may let them.

DESCRIPTION OF SYMBOLS 1 Gas stopper with a fuse 1 'Gas stopper with a fuse 2 Plug body 2D Gas passage 2H Upstream part 2j Valve seat 3B Downstream valve part (valve)
3c Tube part (separation part)
3d passage hole (communication hole)
3f Fuse valve seat 5 Receiving member (stop part)
5b Support arm part 5c Support cylinder part (support part)
5d guide hole 10 main spring (biasing means)
14 Retaining ring (protrusion)
15 Fuse spring

Claims (2)

A gas passage through which gas flows is formed, a plug body having a valve seat formed on the inner peripheral surface of the gas passage, a first closed position seated on the valve seat inside the gas passage, and the valve seat A valve body movably provided between the first open position and the first open position separated from the upstream side, and urging the valve body from the first open position toward the first closed position to the valve seat. A main spring to be seated; a fuse valve provided movably in the same direction as the valve body in the gas passage upstream of the valve body; and provided between the plug body and the fuse valve; A fuse spring that urges the fuse valve toward the upstream side, and the valve body divides the interior of the gas passage located upstream from the valve seat into an upstream portion and a downstream portion. A separation part is provided, and the separation part communicates the upstream part and the downstream part. And a fuse valve seat is provided on the inner peripheral surface of the communication hole. The fuse spring is a coil spring, and the fuse valve has a predetermined flow rate of the gas flowing through the gas passage. When it is within the range, when the flow rate of the gas in the gas passage becomes excessive beyond the appropriate range, it is positioned at the second open position spaced upstream from the fuse valve seat by the fuse spring. In the gas stopper with a fuse that is moved downstream to the second closed position against the biasing force of the fuse spring by the gas flowing in the passage and is seated on the fuse valve seat,
Inside the gas passage, when the fuse valve moves downstream beyond the second closed position, the portions of the wire constituting the fuse spring separated from each other by one pitch come into contact with each other. A gas stopper with a fuse, wherein a stop portion for stopping the fuse valve is provided in advance. The fuse valve has a valve portion that is seated on the fuse valve seat, and a guide shaft portion that is smaller in diameter than the valve portion and extends upstream from the valve portion, and the stop portion supports the valve portion. And a guide hole through which the guide shaft is movably inserted. The guide hole protrudes upstream from the guide hole. The upstream end portion of the guide shaft portion is provided with a protruding portion that protrudes in the radial direction of the guide shaft portion, and the guide shaft portion positioned between the protruding portion and the support portion includes: The fuse spring for urging the fuse valve to the upstream side through the protruding portion is extrapolated, and the support portion extends from the support portion toward the upstream side, and an upstream tip portion is the protruding portion. Support arm that stops the fuse valve by hitting it , Fused gas valve according to claim 1, characterized in that it is arranged to surround the fuse springs.

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