JP2015096746A - Excess flow-out prevention valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excess flow-out prevention valve that is provided even in a gas flow passage, easy to be attached and easy to adjust setting pressure.SOLUTION: An excess flow-out prevention valve comprises: a ball valve 10 capable of moving in a direction of closing a valve seat port in a gas flow passage; holding members 11-13 supporting the ball valve 10; and a tension spring 17 biasing the ball valve 10 to the side of the holding members 11-13. In the excess flow-out prevention valve, first and second locking parts 16, 14 locking both ends of the tension spring 17 are formed at respective predetermined positions of the ball valve 10 and the holding piece 12; and the natural length of the tension spring 17 is set so as to be shorter than the distance between the first and second locking parts 16, 14 at the normal time when the ball valve 10 is held by the holding piece 12.

Description

  The present invention relates to an overflow prevention valve, and more particularly to an overflow prevention valve that is mounted in a gas flow path and automatically shuts off the gas flow path when the amount of gas in the gas flow path exceeds a predetermined flow rate. .

A valve disclosed in Japanese Utility Model Laid-Open No. 60-61570 has been devised as an overflow prevention valve that shuts off the gas flow when the gas flow path is in an overflow state.
As shown in FIG. 5, this is accommodated in a cylindrical casing (40) open at both ends, which is densely inserted into a hose end (4) as a gas flow path, and a cylindrical casing (40). A flat plate-shaped holding member (30) and a ball valve (3) held by the holding member (30) via a tension spring (41), the holding member (30) is a cylindrical casing (40) A flat substrate (31) installed along one diameter near the upstream open end of the tube, and extending from both ends of the flat substrate (31) to the downstream side of the gas flow path along the inner wall of the cylindrical casing (40) A pair of side pieces (32), (32) and a central piece (33) protruding in the same direction as the side pieces (32), (32) from the center of the flat substrate (31) It is formed in a plate shape.

On both outer sides of the flat substrate (31), convex portions (34) and (34) are respectively projected outward, and these are the ones on the inner surface near the upstream open end of the cylindrical casing (40). The fitting portions are fitted into a pair of recesses (44) and (44) formed at both ends of one diameter, and the fitting portions are fixed with an adhesive or crimped.
A tapered valve seat (42) is provided at the downstream open end of the cylindrical casing (40).
One end of the tension spring (41) is locked to the central piece (33) of the holding member (30), and the other end is locked to an annular groove (35) formed in the ball valve (3). Due to the biasing force of the tension spring (41), the ball valve (3) is set to be supported by the tip of the side pieces (32) (32) on the upstream side of the valve seat port (42). Yes.

When the amount of gas flowing into the hose end (4) exceeds a certain flow rate, the ball valve (3) is pushed by the gas pressure and resists the biasing force of the tension spring (41) on the downstream side (left side in the drawing). As shown by the two-dot chain line in the figure, it is pressed against the valve seat opening (42). Thereby, the flow of gas is interrupted.
Then, when the gas outflow state is improved, the ball valve (3) is pulled back to the upstream side by the urging force of the tension spring (41), and is supported by the tip portions of the side pieces (32) (32). Return to the initial state.

Japanese Utility Model Publication No. 60-61570

In the overflow prevention valve having the above structure, the cylindrical casing (40) is fixed in the gas flow path such as the hose end (4), and the holding member (30) is fixed in the cylindrical casing (40) by an adhesive or caulking. Because it is fixed, in order to adjust the working flow rate of the gas flowing through the gas flow path, fine adjustment of the mounting position of the holding member (30) and the ball valve (3) accommodated in the cylindrical casing (40) In addition, it is impossible to replace or repair the overflow prevention valve composed of the holding member (30) and the tension spring (41). Therefore, there is a problem that the correction cannot be made if the operating flow rate of the gas in the gas flow path deviates from the set value.
In addition, in the conventional one, the cylindrical casing (40) for fixing the holding member (30) is a thin metal cylindrical body, so that the concave portions (44) (44) are formed in one diameter provided at both ends. By pushing the cylindrical casings (40) at both ends of other diameters orthogonal to the inside from the outside, the inside diameter between the recesses (44) (44) can be elastically expanded, and in this state, The convex portions (34) and (34) of the holding member (30) could be fitted into the concave portions (44) and (44) of the cylindrical casing (40). However, the holding member (30) cannot be directly mounted in a gas flow path such as a gas inflow cylinder of a brass gas stopper whose inner diameter cannot be finely adjusted. Even if the holding member (30) is used, it is difficult to securely fix the cylindrical casing (40) at a predetermined position such as a gas inflow cylinder portion of an existing gas stopper.

  The present invention relates to a ball valve movable in a direction to close a tapered valve seat provided in a gas flow path, a holding member that supports the ball valve, and a gap between the ball valve and the holding member. In the “overflow prevention valve composed of a tension spring that interposes and biases the ball valve toward the holding member”, it can be easily attached to any gas flow path, and the position is adjusted to adjust the working flow rate. It is an object to provide an overflow prevention valve that can be replaced or repaired.

The overflow prevention valve according to the present invention includes: “the holding member is larger in diameter than the inner diameter of the gas flow path and can be elastically reduced in diameter; And a holding piece that releasably holds the ball valve at its tip, and a connecting piece that connects the holding piece and the inner wall of the fixed cylinder,
First and second locking portions are formed at predetermined positions of the ball valve and the holding piece, respectively, at which both ends of the tension spring are locked,
The natural length of the tension spring is set to be shorter than the distance between the first and second locking portions in a normal state in which the ball valve is held by the holding piece. Is.

The technical means operates as follows.
If the diameter of the fixed cylinder is elastically reduced and inserted from the front end side of the holding member into the gas flow path having a smaller diameter than the fixed cylinder, and after reaching the predetermined position, the fixed cylinder is elastically restored. The fixed cylinder is mounted in a state where the outer surface thereof is crimped to the inner peripheral surface of the gas flow path. The fixing position of the fixed cylinder in the gas flow path may be an alignment jig in which the insertion distance from the upstream open end of the gas flow path is constant.
Since the fixed cylinder is only fixed by being crimped to the inner peripheral surface of the gas flow path, it can move in the flow path direction and fine adjustment of the mounting position is possible.

In a normal state, the ball valve is urged by the urging force of the tension spring to be attached to the tip of the holding piece on the upstream side of the valve seat port.
When the gas in the gas flow path becomes excessively outflowed, the ball valve is pushed by the gas pressure, moves away from the tip of the holding piece while extending the tension spring, and is pressed against the valve seat. Then, the gas flow path is shut off. When the overflow state is improved, the ball valve is separated from the valve seat by the urging force of the tension spring, and returns to the original state where it is attached to the tip of the holding piece.

The overflow prevention valve is further provided as follows: “The fixed cylinder is a substantially rectangular C-shaped body in which a substantially rectangular metal thin plate is curved so that both short sides face each other,
The connecting piece extends from one short side of the fixed cylinder toward the center of the fixed cylinder,
The holding piece is preferably extended further downstream from the vicinity of the extending end of the connecting piece.

  The fixed cylinder formed in a C-shaped cross section by a substantially rectangular metal thin plate can be elastically reduced in diameter by reducing the distance between the short sides by pressing the outer surface with a finger. It can be inserted into the flow path. The connecting piece and the holding piece form a substantially L-shaped thin plate-like body as a whole, and the base end portion of the connecting piece is connected to one short side of the fixed cylinder. Yes.

Further, the overflow prevention valve is, “The ball valve is open so that one hole portion into which the tip of the holding piece is inserted in a loosely fitting state passes through the center thereof,
The first locking part is an annular groove formed concentrically on the periphery of the open end of the hole part,
The second locking portion is a locking groove provided in a proximal end portion of the holding piece,
The tip of the holding piece is set to abut against the closed end of the hole by the urging force of the tension spring and to be positioned near the open end of the hole when the tension spring is fully extended. '' desirable.

  One end of the tension spring is locked in the annular groove formed in the ball valve, and the other end is locked in the locking groove formed in the base end portion of the holding piece. It is interposed between. As the tension spring expands and contracts, the tip of the holding piece moves forwards and backwards in the hole provided in the ball valve. ing. From this state, when the gas flow path is in an excessive outflow state, the tension spring is extended until the end of the holding piece is located in the vicinity of the open end of the hole, but when the overflow state is improved, the tension spring Due to the urging force, the tip of the holding piece returns to the initial position where it is inserted into the hole of the ball valve without being displaced from the hole.

In addition, the overflow prevention valve is described as follows: “An annular groove portion that is wider than the height of the fixed cylinder and has a depth greater than the thickness of the fixed cylinder is formed at a predetermined position on the inner peripheral surface of the gas flow path. The outer diameter of the fixed cylinder is preferably larger than the inner diameter of the annular groove portion.
The fixed cylinder is inserted into the gas flow path while reducing the diameter of the fixed cylinder, and when the fixed cylinder reaches the annular groove in the gas flow path, the fixed cylinder is accommodated in the annular groove. The Since the width of the annular groove is set wider than the height of the fixed cylinder, the fixed cylinder can be finely adjusted in the flow path direction within the annular groove. Further, since the thickness of the fixed cylinder enters the annular groove, the gas flow path is not narrowed by the thickness of the fixed cylinder.

Further, among the overflow prevention valves, “a large-diameter portion that opens to the upstream open end is formed on the inner peripheral surface of the gas flow path,
The step between the large-diameter portion and the downstream flow path is set to be equal to or greater than the thickness of the fixed cylinder, and the distance from the upstream open end to the step is higher than the height of the fixed cylinder. It is set long,
In the case where the outer diameter of the fixed cylinder is larger than the inner diameter of the large-diameter portion, it is inserted into the large-diameter portion from the upstream open end of the gas flow path while reducing the diameter of the fixed cylinder. The fixed cylinder is prevented from entering when it contacts the step located on the downstream side of the large diameter portion, and the fixed cylinder does not enter the gas flow path any more. If the level of the step is set so as to be the lower limit of the working flow rate, it is easy to align the working flow rate. Further, the gas flow path is not narrowed by the thickness of the fixed cylinder.

According to the present invention, the diameter of the fixed cylinder is elastically reduced, inserted into a gas flow path having a smaller diameter, and elastically returned at a predetermined position, whereby the outer surface of the fixed cylinder is placed in the gas flow path. Thus, the overflow prevention valve can be easily and reliably attached to any gas flow path, and can be easily removed, replaced, or repaired.
Since the fixed cylinder is only pressed into the gas flow path, the mounting position can be finely adjusted in the flow path direction, and the setting of the working flow rate can be adjusted.
In addition, since the number of parts is small compared to the conventional one, the cost is low and the assembly is easy.
Furthermore, the holding member has a structure in which the fixed cylinder is in close contact with the inner peripheral surface of the gas flow path, and the connecting piece having the holding piece is extended from the fixed cylinder in the radial direction. can do.

  Further, when the fixed cylinder is formed by bending a metal thin body so as to have a substantially C-shaped cross section, the fixed cylinder can be easily reduced in diameter and can be more easily attached to the gas flow path. In addition, the connection piece and the holding piece constitute a substantially L-shaped thin plate-like body as a whole, and this is connected to one short side of a substantially rectangular fixed cylinder. Since the holding member is completed simply by punching the plate into a predetermined shape and bending and bending the predetermined portion, the manufacturing of the holding member is facilitated.

  The tip of the holding piece is configured to move forward and backward in the hole provided in the ball valve, and when the urging force is applied again after the tension spring reaches its maximum extension state, By setting so as to be able to return to the original mounting state that reaches the closed end of the ball valve, there is no inconvenience that the ball valve is displaced from the holding piece or detached. Therefore, the ball valve can always be maintained in a stable state at the center of the holding member, and it is difficult for the operating flow rate to vary.

  Further, in the case where the fixed cylinder is configured to be accommodated in an annular groove portion or a large diameter portion provided in the gas flow path, the fixed cylinder is securely attached to a predetermined position in the gas flow path without using an alignment jig. This makes it easier to install the overflow prevention valve. Further, since the thickness of the fixed cylinder does not protrude into the gas flow path, the gas flow path is not narrowed by the thickness of the fixed cylinder, and the flow resistance of the gas flow path can be further reduced.

It is a perspective view of the excessive outflow prevention valve of embodiment of this invention. It is sectional drawing of the 1st gas stopper which accommodated the excessive outflow prevention valve of embodiment of this invention. It is a principal part expanded sectional view of the 2nd gas stopper which accommodated the excessive outflow prevention valve of embodiment of this invention. It is a principal part expanded sectional view of the 3rd gas stopper which accommodated the excessive outflow prevention valve of embodiment of this invention. FIG. 6 is a cross-sectional view of a hose end portion that houses a conventional overflow prevention valve.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring an accompanying drawing.
FIG. 1 is a perspective view of an overflow prevention valve (1) according to an embodiment of the present invention. As shown in FIG. 2, the valve is inserted into a gas inflow cylinder (21) of a brass gas plug (2). Shall be used.

As shown in FIG. 1, the overflow prevention valve (1) according to the present invention comprises a thin metal plate having elasticity as a whole, and has both short sides (13a) (13b) of a rectangular plate-like body. A fixed cylinder (13) having a substantially C-shaped cross section curved so as to face each other at a predetermined distance, and from one short side (13a) of the fixed cylinder (13) to the center of the fixed cylinder (13) The connecting piece (11) extended along a single radius toward the end, and extended upward (downstream) along the center line of the fixed cylinder (13) from the vicinity of the extending end of the connecting piece (11) And holding piece (12). A ball valve (10) is held at the tip of the holding piece (12), and a tension spring (17) is interposed between the base end of the holding piece (12) and the ball valve (10). ing.
In addition, the description of “upper” and “lower” below corresponds to the upper and lower sides in FIG.

The connecting piece (11) and the holding piece (12) are formed in a substantially L shape as a whole, and the connecting piece (11) is a belt-like body having a height equal to or less than half of the height of the fixed cylinder (13). And extends inward from a predetermined range near the upstream side (lower side in FIG. 1) of the fixed cylinder (13). The holding piece (12) is composed of a trapezoidal substrate (12a) connected to the upper side in the vicinity of the extending end of the connecting piece (11), and an elongated holding bar (12b) extended further upward from the upper side. It is configured.
A pair of locking grooves (14), (14) as the second locking portions for locking the upstream end of the tension spring (17) on both sides between the substrate (12a) and the connecting piece (11) Is formed to open to both sides.

  As shown in FIG. 2, the ball valve (10) is formed so that a hole (15) into which the holding rod (12b) of the holding piece (12) is inserted in a loosely fitting state passes through the center thereof. On the periphery of the open end of the hole (15), an annular groove (16) serving as the first locking portion for locking the downstream end of the tension spring (17) is concentric with the hole (15). It is formed in a shape.

  With the holding rod (12b) inserted into the hole (15) until the tip of the holding rod (12b) reaches the closed end (15a) of the hole (15), the locking groove (14) and the annular recess When both ends of the tension spring (17) are locked in the groove (16), the assembly of the overflow prevention valve (1) is completed. Note that the biasing force of the tension spring (17) is set by setting the length from the locking groove (14) to the annular concave groove (16) to be longer than the natural length of the tension spring (17) in this state. Thus, the mounting state in which the tip of the holding rod (12b) is in contact with the closed end (15a) of the hole (15) is maintained.

  FIG. 2 shows a brass gas stopper (2) to which an overflow prevention valve (1) is attached, an upstream gas inflow cylinder (21) and a downstream gas outflow cylinder (22). A thread accommodating part (20) is provided between them, and the thread accommodating part (20) accommodates a thread (23) through which the communication hole (25) passes. The screw (23) can be rotated in the screw housing (20) by the operation knob (24), and both open ends of the communication hole (25) are operated by operating the operation knob (24). By rotating the screw (23) so as to open to the side (21) side and the gas outflow tube (22) side, the gas inflow tube (21) to the screw (23) through the communication hole (25) Thus, a gas flow path reaching the gas outflow tube portion (22) is formed. The overflow prevention valve (1) is mounted in the vicinity of the upstream open end on the upstream side of the valve seat port (26) of the gas inflow cylinder portion (21).

The outer diameter of the fixed cylinder (13) in the natural state is set to be larger than the inner diameter of the gas inflow cylinder (21), and the overflow prevention valve (1) assembled in the above manner has both short sides. (13a) By pressing the outer surface of the fixed cylinder (13) so that the distance of (13b) is reduced, the outer diameter of the fixed cylinder (13) is reduced, while the upstream side of the gas inflow cylinder (21) is The ball valve (10) can be inserted into the open side end first. At this time, although not shown, the overflow prevention valve (1) can be mounted at a predetermined position recessed from the upstream open end of the gas inflow cylinder (21) by a predetermined distance by using an alignment jig.
Note that the fixed cylinder (13) is not fixed to the inner peripheral surface of the gas inflow cylinder (21) by an adhesive or caulking, etc. The position can be finely adjusted in the flow path direction.

FIG. 2 shows a normal use state, in which the tip of the holding rod (12b) of the holding piece (12) contacts the closed end (15a) of the hole (15) provided in the ball valve (10). Maintained. From this state, when the amount of gas in the gas flow path exceeds a certain flow rate, the ball valve (10) is pushed by the gas pressure, and while extending the tension spring (17), it is downstream (right side in the drawing). ) To move away from the holding rod (12b) of the holding piece (12) and press-contact with the valve seat opening (26) as shown by a two-dot chain line in FIG. Thereby, the flow of gas is interrupted.
When the gas overflow state is improved, the ball valve (10) is pulled back to the upstream side by the urging force of the tension spring (17), and the holding rod (12b) of the holding piece (12) is moved to the ball valve (10 ) Is again inserted into the hole (15), and the holding rod (12b) is returned to the original posture in which the tip of the holding rod (12b) contacts the closed end (15a) of the hole (15).
In addition, by forming the diameter of the hole (15) so as to correspond to the radial length of the ball valve (10), the ball valve (10) once separated from the tip of the holding rod (12b) is pulled. Due to the urging force of the spring (17), even if it is slightly distorted when inserted into the hole (15) again, it can be reliably reinserted into the hole (15) without detaching from the hole (15). .

  Further, as shown in FIG. 3, an annular groove portion (5) is formed in the gas inflow cylinder portion (21) of the gas stopper (2), and the overflow prevention valve (1) is formed in the annular groove portion (5). It is good also as a structure which accommodates a fixed cylinder (13). The depth (D1) of the annular groove (5) is set deeper than the thickness (d) of the fixed cylinder (13), and the width (W) in the flow path direction of the annular groove (5) is fixed. It is desirable that the length is set longer than the height (h) of the tube (13).

In this case, the ball valve (10) is mounted on the holding piece (12) and pulled between the retaining groove (14) of the holding piece (12) and the annular groove (16) of the ball valve (10). The overflow prevention valve (1) assembled with the spring (17) interposed is inserted into the gas inflow cylinder (21) from the ball valve (10) side while reducing the diameter of the fixed cylinder (13). . When the fixed cylinder (13) reaches the annular groove (5), the reduced diameter state is opened, so that the fixed cylinder (13) is attached to the annular groove (5) in a pressure contact state.
Since the width (W) in the flow path direction of the annular groove (5) is set to be longer than the height (h) of the fixed cylinder (13), the overflow prevention valve (1) has the annular groove (5 ) And the height (h) of the fixed cylinder (13) can be moved in the direction of the flow path, and the installation position of the overflow prevention valve (1) can be finely adjusted. .
Further, if the step portion (51) corresponding to the downstream end portion of the annular groove portion (5) is dimensioned to be the lower limit of the working flow rate, the gas inflow cylinder portion ( An overflow prevention valve (1) can be mounted at a predetermined position of 21).
In the excessive outflow state, as in the first embodiment described above, the ball valve (10) moves downstream as the tension spring (17) is extended as shown by the two-dot chain line in FIG. Then, the gas flow path is shut off by contacting the valve seat (26) of the gas inflow cylinder (21).

4 shows that the upstream end of the annular groove (5) as described above is opened to the upstream open end of the gas inflow cylinder (21), and the upstream side of the gas inflow cylinder (21). A large-diameter portion (50) that is open to the outside is configured.
The depth (D2) of the large diameter part (50) is set deeper than the wall thickness (d) of the fixed cylinder (13), and the step (52) on the downstream side of the large diameter part (50) If the dimensions are set so as to be the lower limit of the working flow rate, the overflow prevention valve (1) can be placed at a predetermined position of the gas inflow cylinder (21) without using an alignment jig as in the above-described embodiment. The overflow prevention valve (1) is movable in the flow path direction within the large diameter portion (50). Therefore, it is possible to finely adjust the mounting position of the overflow prevention valve (1).

When the annular groove (5) or large diameter part (50) is formed in the gas inflow tube part (21) of the gas stopper (2) as shown in FIGS. 3 and 4, an alignment jig is required. Therefore, the working efficiency is improved and the positioning for adjusting the operation flow rate is easy to perform.
Further, the depth (D1) (D2) of the annular groove (5) and the large diameter portion (50) is formed deeper than the wall thickness (d) of the fixed cylinder (13). At the time of mounting (1), the thickness of the fixed cylinder (13) does not protrude into the gas inflow cylinder part (21). Therefore, the flow path resistance of the gas inflow cylinder (21) is further reduced.

(1) ...
(10) ... Ball valve
(11) ... ・ Connecting piece (holding member)
(12) ... ・ Holding piece (holding member)
(13) ... Fixed cylinder (holding member)
(17) ... Tension spring
(14) ・ ・ ・ ・ ・ ・ ・ Locking groove (second locking part)
(16) ..... Annular groove (first locking part)
(26) ... Valve seat opening

Claims (5)

A ball valve that is movable in a direction to close a tapered valve seat provided in the gas flow path, a holding member that supports the ball valve, and the ball valve interposed between the ball valve and the holding member In the overflow prevention valve comprising a tension spring that urges the holding member toward the holding member,
The holding member has a fixed cylinder that is larger than the inner diameter of the gas flow path and can be elastically reduced in diameter, and is open along both the center line of the fixed cylinder and the ball valve at the tip thereof. It consists of a holding piece that is releasably held, and a connecting piece that connects the holding piece and the inner wall of the fixed cylinder,
First and second locking portions are formed at predetermined positions of the ball valve and the holding piece, respectively, at which both ends of the tension spring are locked,
The natural length of the tension spring is an overflow prevention valve that is set to be shorter than the distance between the first and second engaging portions in a normal state in which the ball valve is held by the holding piece. The overflow prevention valve according to claim 1, wherein the fixed cylinder is a substantially rectangular C-shaped body in which a substantially rectangular metal thin plate is curved so that both short sides face each other,
The connecting piece extends from one short side of the fixed cylinder toward the center of the fixed cylinder,
The holding piece is an overflow prevention valve that extends further downstream from a portion near the extended end of the connecting piece. 3. The overflow prevention valve according to claim 1 or 2, wherein the ball valve is open so that one hole portion into which the tip of the holding piece is inserted in a loosely fitting state passes through the center thereof. ,
The first locking part is an annular groove formed concentrically on the periphery of the open end of the hole part,
The second locking portion is a locking groove provided in a proximal end portion of the holding piece,
The end of the holding piece abuts against the closed end of the hole by the urging force of the tension spring, and is set to be positioned near the open end of the hole when the tension spring is fully extended. valve.   The overflow prevention valve according to any one of claims 1 to 3, wherein the predetermined depth on the inner peripheral surface of the gas flow path is wider than the height of the fixed cylinder and a depth equal to or greater than the thickness of the fixed cylinder. An overflow prevention valve in which an annular groove having a diameter is formed and an outer diameter of the fixed cylinder is larger than an inner diameter of the annular groove. In the overflow prevention valve according to any one of claims 1 to 3, a large-diameter portion that opens to an upstream open end is formed on an inner peripheral surface of the gas flow path,
The step between the large-diameter portion and the downstream flow path is set to be equal to or greater than the thickness of the fixed cylinder, and the distance from the upstream open end to the step is higher than the height of the fixed cylinder. It is set long,
The overflow prevention valve in which the outer diameter of the fixed cylinder is formed larger than the inner diameter of the large-diameter portion.

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