JP2005076676A - Connecting structure of connector and gas valve provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide connecting structure of a connector (1) to be fitted on a cylindrical main body (2) provided in the upstream or the downstream of a gas valve (G) and allowing re-connection even after connecting once. <P>SOLUTION: A male screw part (20) and a screw non-formed area (21) are formed on the outer peripheral surface of a cylindrical main body (2). The female screw part (11) of the connector (1) and an annular recessed groove (12) are formed, and a lock means (5) for connecting the connector (1) to the cylindrical main body (2) in a relative rotation preventing condition is provided. The male screw part (20) is opposed to the annular recessed groove (12), and the female screw part (11) is opposed to the screw non-formed area (21). A seal member (23) is arranged, which retains the flange (1) and cylindrical main body (2) in a peripheral air-tight condition under a first connecting state to make the lock means (5) in a unlock state and a second connecting state to make the lock means (5) in a lock state from the first connecting state. The lock condition by the lock means (5) can be canceled appropriately. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint connection structure, and more particularly to a joint connection structure to be connected to a gas inflow tube portion or a gas outflow tube portion of a gas plug and a gas plug provided with the same.

  An example of a conventional gas plug (G) that is directly connected to a gas appliance is shown in FIG. This includes a spiral housing portion (33) in which the spiral (32) is accommodated, and a gas inflow cylinder portion (3a) located upstream (right side in the drawing) and communicating with the spiral accommodating portion (33). And a gas outlet tube portion (3b) located on the downstream side (on the left side in the drawing) of the thread housing portion (33) and communicating with the inside of the thread housing portion (33). A gas flow path (34) is formed coaxially from the upstream end of the inflow tube portion (3a) to the downstream end of the gas outflow tube portion (3b), and the thread (32) is connected to the interior of the thread storage section (33). The gas flow path (34) can be freely opened and closed by rotating at.

  A flexible pipe (36) is connected to the gas inflow cylinder (3a) through a pipe joint (35) as shown by a two-dot chain line in the figure. And, in the gas outflow tube portion (3b), in order to threadably connect to the gas intake tube portion (40) serving as a gas intake port for taking in the gas into the gas device (4), a connection joint for connecting the device ( 30) is connected.

  The connection joint (30) in this example is airtight and rotatably attached to the gas outflow tube portion (3b), and is attached to the inner peripheral surface on the open end side of the gas appliance (4). A female thread portion (31) that can be screwed into the gas intake tube portion (40) is formed.

In this conventional gas plug (G), the tip of the gas intake cylinder (40) of the gas appliance (4) is screwed to the open end of the connection joint (30) and the connection joint (30) is rotated in the tightening direction. By doing so, the gas intake cylinder part (40) is screwed into the female thread part (31) in the connection joint (30). As a result, the gas plug (G) is connected to the gas intake cylinder (40) of the gas appliance (4) via the connection joint (30), and the gas from the flexible pipe (36) is supplied to the gas appliance. (4) can be supplied.
JP 2002-323161 A JP 2002-333076 A

  However, in this conventional one, since the connection joint (30) attached to the gas outflow tube portion (3b) of the gas stopper (G) cannot be removed, the gas outflow tube portion (3b) and Even when foreign matter is mixed into the connecting joint (30) or airtightness is detected, the connection of the connecting joint (30) to the gas outflow tube (3b) cannot be performed again. For this reason, when a problem occurs in the connection portion between the gas outflow tube portion (3b) and the connection joint (30), the gas plug (G) must be replaced, which is uneconomical.

  The present invention is the "connecting structure in which one end of the joint is externally connected to the cylindrical main body constituting the upstream flow path or the downstream flow path of the gas plug" after connecting the joint to the cylindrical main body. However, it is an object to be able to redo the connection between the two.

(1) In the joint connection structure of the invention according to claim 1, a male screw portion is formed in a predetermined range of the outer peripheral surface of the cylindrical main body,
A female threaded portion that can be screwed onto the male threaded portion is formed on the inner peripheral surface of one end of the joint, and an annular concave groove that can accommodate the male threaded portion surrounds the inner threaded side. Formed continuously in the direction,
A screw non-formation area capable of accommodating the female screw portion is provided closer to the base end side than the male screw of the cylindrical main body,
Locking means for connecting the joint and the cylindrical main body in a relative rotation blocking state is provided,
A connection mode in which the male screw portion corresponds to the annular groove, the female screw portion corresponds to the screw non-formation region, and the locking means is in a non-locked state is a first connection state,
A connection mode in which the locking means is locked from the first connection state is a second connection state,
In the first and second connection states, a seal member is provided that holds the joint and the cylindrical main body in an outer airtight state,
The locked state by the locking means can be released as appropriate.
The above means operates as follows.
The one end of the joint is fitted over the open end of the tubular main body of the gas stopper, and the joint is rotated and tightened so that the female thread portion of the joint is screwed into the male thread portion of the tubular main body. As the joint is tightened, the joint is deeply fitted into the cylindrical main body, the entire area of the male threaded portion corresponds to an annular groove following the female threaded part, and the female threaded part is a threaded non-cylindrical thread. When it corresponds to the formation area, the male screw portion and the female screw portion are unscrewed, and the joint is connected to the cylindrical main body in an idle state. At this time, the locking means is in an unlocked state. This state is the first connection state, and the joint is connected to the cylindrical main body of the gas stopper in an airtight state and rotatable. And the state which locked the said locking means in the said 1st connection state is a 2nd connection state, and the said joint is connected to the state fixed to the relative rotation prevention state with respect to the said cylindrical main body.

  The locking means in the locked state is provided so as to be able to be released as appropriate. After the locking means is released, the joint returns to the first connection state that is rotatable with respect to the cylindrical main body. Then, while pulling the joint and the cylindrical main body away from each other, the male screw part and the female screw part are forcibly engaged from the opposite direction, and from this state, the female screw part and the male screw part are screwed together. If the joint is loosened, the joint can be removed from the cylindrical main body. The separated joint can be reconnected to the cylindrical main body as described above.

(2) The joint connection structure of the invention according to claim 2 is the one according to claim 1, wherein the locking means is a screw cylinder that can be screwed onto the outer peripheral surface of the joint or the cylindrical main body,
The screw tube in the first connection state is in an untightened state, and the screw tube in the second connection state is in a tightening completion state in which the screw tube is tightened to a final tightening state;
In the second connection state, a pressure contact surface provided on the screw cylinder or the joint is set so as to press-contact a pressure contact surface provided on the cylindrical main body. When the screw cylinder is tightened to the final tightened state, the pressure contact surface provided on the screw cylinder or the joint strongly presses the pressure contact surface provided on the cylindrical main body, and the pressure contact surface and the pressure contact A frictional resistance is generated between the surface and the surface. Due to this frictional resistance, the joint is prevented from rotating relative to the cylindrical main body, and the joint cannot be rotated in the direction of loosening the screwing between the male screw portion and the female screw portion.

(3) The joint connection structure of the invention according to claim 3 is the one according to claim 1, wherein the locking means is a screw cylinder that can be screwed onto the outer peripheral surface of the joint or the cylindrical main body,
The screw tube in the first connection state is in an untightened state, and the screw tube in the second connection state is in a tightening completion state in which the screw tube is tightened to a final tightening state;
In the second connection state, the pressure contact surface provided on the screw cylinder is set so as to press-contact the pressure contact surface provided on the joint. When tightened to the tightened state, the pressure contact surface provided on the screw cylinder strongly presses against the pressure contact surface provided on the joint, and a frictional resistance is generated between the screw cylinder and the joint. Therefore, the joint is in a state of preventing relative rotation with respect to the cylindrical main body.

(4) The joint connection structure of the invention according to claim 4 is the one according to any of the above claims, wherein a concave groove is formed along the circumferential direction on the outer peripheral surface in the vicinity of the open end of the cylindrical main body. An O-ring as the seal member is accommodated in the groove, and in the first and second connection states, the O-ring is pressed against the inner peripheral surface of the joint further on the back side than the annular groove. The joint and the cylindrical main body are connected to the outer peripheral airtight state by the O-ring in both the first connection state and the second connection state.

(5) In the invention according to claim 5, the joint according to any one of claims 1 to 4 is provided on both of the cylindrical main body constituting the upstream flow path and the downstream flow path of the gas stopper. The present invention relates to a gas stopper provided with a connection structure.

  According to the first aspect of the invention, in the second connection state, the joint is locked in the relative rotation blocking state with respect to the tubular main body of the gas stopper by the locking means, so that the joint is loosened. Cannot be rotated. Therefore, the joint is fixed to the cylindrical main body in a retaining state. Since the locking state of the locking means can be released, if a problem such as foreign matter contamination or poor airtightness occurs at the connecting portion between them, the joint is once removed from the cylindrical main body by releasing the locking state. The joint can be connected again. Thereby, even if there is a problem in the connection of the joint, it is not necessary to replace the gas plug, so there is no waste. Further, in the second connection state, the joint and the cylindrical main body are fixed in a relative rotation preventing state, so that the seal member interposed therebetween is not unnecessarily worn. Therefore, damage due to wear of the seal member can be prevented.

  According to the invention according to claim 2 or 3, when the screw cylinder provided as the locking means is tightened until the final tightening state is reached, the joint and the tubular shape are caused by the frictional resistance generated between the pressure contact surface and the pressure contact surface. Since the locked state in which the main body is locked in the relative rotation blocking state is released and the screw cylinder is loosened, the locked state is released. Therefore, the connection to the second connection state and the release thereof are easily performed. I can do it. Further, by pressing the pressure contact surface strongly against the pressure contact surface, in the second aspect, between the screw cylinder or joint and the cylindrical main body, and in claim 3, between the screw cylinder and the joint. Since airtightness will be ensured, the outer periphery airtight state by a sealing member can be made more reliable.

  According to the invention of claim 4, the seal member is protected by connecting to the second connection state, and in the above-described claims 2 and 3, the pressure contact force between the pressure contact surface and the pressure contact surface also acts. As a result, a sufficient sealing effect can be expected with only an O-ring as the sealing member.

  According to the invention which concerns on Claim 5, even after piping connection, there exists an effect that the performance of a gas stopper can be confirmed by removing and replacing | exchanging a gas stopper part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the joint connection structure according to the first embodiment of the present invention.
The cylindrical main body (2) for externally connecting the joint (1) of the present invention is the gas outflow cylinder portion (3b) of the gas plug (G), as in the conventional one, and the joint (1) is also conventional. In the same manner as the above, a connection joint for screwing and connecting to a gas intake tube portion for gas intake of a gas appliance (not shown) is provided.

  The joint (1) is a substantially cylindrical tubular body, and is formed with an internal thread portion (11) and an annular groove (12) in this order from one end (right end in the drawing) of the inner peripheral surface thereof. At the open end on the side, a connection screw portion (13) is formed for screwing into the gas intake tube portion of the gas appliance. Further, a tip screw portion (10) is formed on the outer peripheral surface on the one end side of the joint (1).

  Incidentally, the screw cylinder (5), which is a locking means for connecting the joint (1) to the cylindrical main body (2) in a state of relative rotation prevention, is a cylindrical body in which substantially the entire inner peripheral surface is threaded. The joint (1) is screwed in advance with the tip thread portion (10).

  On the outer peripheral surface of the cylindrical main body (2) to which the joint (1) is fitted, a screw non-formation region (21) and a male screw (11) to which the male screw portion (11) can be screwed in order from the base end side. Portions (20) are formed in order. An O-ring (23) is fitted in an annular groove formed on the outer peripheral surface near the open end.

  The base end portion of the non-thread-forming region (21) of the cylindrical main body (2) has an annular base end surface (22) having a width substantially matching the wall thickness of the joint (1). An extended peripheral surface (24) is formed so as to extend from the outer peripheral edge of the annular base end surface (22) to the distal end screw portion (10) of the joint (1). Has been. Further, a stepped portion (25) is formed at the proximal end portion of the extended peripheral surface (24).

  The width of the annular groove (12) of the joint (1) is set larger than the length in the axial direction of the formation range of the male screw portion (20), and the width of the non-thread-forming region (21) is set. The length in the axial direction is set to be larger than that of the female screw portion (11).

  FIG. 1 shows a first connection state in which the joint (1) is rotatably connected to the cylindrical main body (2). In order to achieve this connection mode, the joint (1) in a state in which the screw cylinder (5) is screwed to the tip thread portion (10) is externally fitted to the cylindrical main body (2) from the one end side. When the crest portion on the one end side of the female thread portion (11) of the joint (1) contacts the crest portion on the open end side of the male thread portion (20) of the cylindrical main body (2). Rotate the joint (1) in the tightening direction. As a result, when the male screw portion (20) is screwed into the female screw portion (11), the joint (1) moves toward the proximal end of the cylindrical main body (2).

As shown in FIG. 1, when the male screw portion (20) corresponds to the annular concave groove (12) of the joint (1) and the female screw portion (11) corresponds to the non-screw forming region (21). The joint (1) is idle with respect to the cylindrical main body (2). In this state, the O-ring (23) is pressed in an airtight state on the inner peripheral surface further on the back side than the annular groove (12) of the joint (1).
This is the first connection state of the joint (1) to the cylindrical main body (2), and the joint (1) is connected to the cylindrical main body (2) so as to be rotatable and in an airtight outer periphery. .

  In this first connection state, if the connecting screw part (13) on the other end side of the joint (1) is rotated in the tightening direction corresponding to the gas intake tube part of the gas appliance, the joint (1) Is screwed into the gas intake cylinder, and the gas stopper (G) is connected to the gas appliance via the joint (1).

  After the screw connection of the joint (1) to the gas intake tube portion of the gas appliance is completed, the screw tube (5) is rotated in the tightening direction. As the screw tube (5) is tightened, the screw tube (5) is advanced from the tip threaded portion (10) to the extended peripheral surface (24) of the gas plug (G) until the screw tube (5) is finally tightened. When tightened, as shown in FIG. 2, the tip end surface (50) of the screw cylinder (5) comes into pressure contact with the annular end surface (25a) of the stepped portion (25).

  That is, the distal end surface (50) of the screw cylinder (5) functions as a pressure contact surface, and the annular end surface (25a) of the step portion (25) provided at the proximal end portion of the cylindrical main body (2) is pressure contacted. It functions as a surface, and a frictional resistance is generated between the tip end surface (50) of the screw tube (5) and the annular end surface (25a) of the step portion (25) by the tightening force of the screw tube (5).

  By the frictional resistance, the screw cylinder (5) is prevented from rotating, so that the joint (1) screwed into the screw cylinder (5) is also locked in a relative rotation preventing state with respect to the cylindrical main body (2). It becomes a state. This connection state is the second connection state, and the joint (1) is held in the cylindrical main body (2) so as not to be detached, and the connection of the gas stopper (G) to the gas appliance is completed.

  After connecting the joint (1) and the cylindrical main body (2) in the locked state as described above, if a problem such as foreign matter entering the connection or poor airtightness is detected, (1) can be once removed from the cylindrical main body (2) and reconnected.

  For this purpose, the tightening of the screw cylinder (5) is weakened using a tool and rotated in the direction of loosening the screw. Thereby, the lock state due to the frictional resistance generated between the tip end surface (50) of the screw cylinder (5) and the annular end surface (25a) of the stepped portion (25) is released, and the joint (1) Is rotatable with respect to the cylindrical main body (2). Therefore, the tool is made to correspond to the tool corresponding part (16) on the outer peripheral surface near the other end of the joint (1), and the joint (1) is released in the direction to release the screw connection to the gas intake cylinder part of the gas appliance. Rotate and remove the fitting (1) from the gas appliance. After that, the joint (1) is pulled in the direction of pulling out from the cylindrical main body (2), and the crest on the back side of the female screw (11) contacts the crest on the base end side of the male screw (20). When contacted, the joint (1) can be removed from the tubular main body (2) by rotating the joint (1) in the loosening direction.

  Since the joint (1) and the cylindrical main body (2) after being removed are the same as before the connection, connect them in the same manner as described above after performing predetermined measures such as removing foreign substances or replacing parts. You can do it.

Next, the structure of the joint of the second embodiment will be described with reference to FIG.
The joint (1) of this embodiment is a connection joint for screwing and connecting to the gas intake tube portion of the gas appliance, as in the first embodiment, and at the end on the gas appliance side. Is formed with a female threaded portion (13) on the inner surface of one end of the gas plug (G) on the side to be externally connected to the cylindrical main body (2) as the gas outlet cylindrical portion (3b). 11) An annular groove (12) is formed in this order.

  Further, a concave groove (14) for accommodating a metal C-shaped ring (15) is formed on the outer peripheral surface near the one end of the joint (1) along the circumferential direction. In the natural state, the inner diameter of the C-shaped ring (15) is set larger than the outer diameter of the joint (1), and the diameter of the cross section thereof substantially matches the depth of the concave groove (14). Is set to about. As a result, the C-shaped ring (15) is housed in the concave groove (14) in an elastically deformed state, and protrudes outward from the concave groove (14) in a natural state.

  Similar to the structure of the first embodiment, the cylindrical main body (2) has an O-ring (23), a male screw portion (20), a screw non-formation region (21) on the outer peripheral surface in order from the open end side. ), An annular base end surface (22), an extended peripheral surface (24), and a stepped portion (25) are formed in this order.In particular, in this embodiment, a male screw portion is provided on the extended peripheral surface (24). (24a) is formed.

  A screw cylinder (5) that functions as a locking means for connecting the joint (1) and the cylindrical main body (2) in a state of preventing relative rotation includes a small inner diameter cylindrical portion that can be externally fitted to the joint (1) at both ends. (51) (52) has a configuration in which a large inner diameter cylindrical portion (53) is formed at an intermediate portion thereof, and the male screw is provided on the inner peripheral surface of one small inner diameter cylindrical portion (51). It is assumed that a female screw part (51a) that can be screwed into the part (24a) is formed.

  The difference in inner diameter between the small inner diameter cylindrical portions (51) and (52) and the large inner diameter cylindrical portion (53) is set so as to substantially match the radius of the cross section of the C-shaped ring (15).

  The screw cylinder (5) is preliminarily fitted onto the joint (1) so that the C-shaped ring (15) is positioned in the large inner diameter cylinder portion (53). For this purpose, in a state where the C-shaped ring (15) is elastically deformed and accommodated in the concave groove (14), one end of the joint (1) is connected to the small inner diameter cylindrical portion (5) of the screw cylinder (5). 52) Just plug it in. When the concave groove (14) corresponds to the large inner diameter cylindrical portion (53), the C-shaped ring (15) is elastically restored, and the elastically restored C-shaped ring (15) has a concave groove on the inner half of the cross section. (14) In a state of being accommodated in the outer peripheral top portion, the outer peripheral top portion comes into contact with the inner peripheral surface of the large inner diameter cylindrical portion (53).

  In this embodiment, the joint (1) is provided in the small inner diameter cylindrical portion (51) of the screw cylinder (5) after the coupling main body (2) is brought into the first connection state that is rotatable. The screw cylinder (5) is tightened so that the female thread part (51a) is screwed into the male thread part (24a) of the extended peripheral surface (24) of the cylindrical main body (2). As the screw cylinder (5) is tightened, the screw cylinder (5) advances toward the gas plug (G), and at this time, approximately half of the cross-section protrudes from the concave groove (14). It is assumed that the dimensional relationship of each part is set so that the ring-shaped ring (15) is locked to the small inner diameter cylindrical part (52) of the screw cylinder (5). That is, by tightening the screw cylinder (5), the joint (1) is drawn toward the base end side of the cylindrical main body (2) via the C-shaped ring (15), and the screw cylinder (5) In the second connection state, which is tightened to the final tightening position, as shown in FIG. 3, one end surface (1a) of the joint (1) presses the annular base end surface (22) of the cylindrical main body (2). It becomes an aspect.

That is, the one end surface (1a) functions as a pressure contact surface, and the annular base end surface (22) functions as a pressure contact surface, and a frictional resistance is generated therebetween. As a result, the joint (1) is connected to the tubular main body (2) in a state of preventing relative rotation.
If the screw cylinder (5) of this embodiment is also rotated by a tool in the direction of loosening the screwing, the lock state of the joint (1) to the cylindrical main body (2) can be released, and the joint ( 1) can be removed from the cylindrical main body (2).

FIG. 4 is a sectional view showing the structure of the joint according to the third embodiment.
As the joint (1) of this embodiment, one having the same configuration as the joint (1) in the first embodiment can be adopted, and the C provided in the second embodiment is used. The concave groove (14) in which the ring-shaped ring (15) is accommodated is provided on the extended peripheral surface (24) of the cylindrical main body (2).

  The screw cylinder (5) is configured in a shape provided with a small inner diameter cylinder portion (52) that is locked to the C-shaped ring (15), similar to the one adopted in the second embodiment. However, in this embodiment, in the state before the connection, it is assumed that the outer peripheral surface (24) of the cylindrical main body (2) is externally fitted.

  After connecting the joint (1) and the cylindrical main body (2) in the first connection state, screwing the connection thread (13) of the joint (1) into the gas intake cylinder of the gas appliance, When the cylinder (5) is tightened, the threaded cylinder (5) moves from the extended peripheral surface (24) of the tubular main body (2) to the joint (1) side while being screwed to the threaded end (10) of the joint (1). When the small inner diameter cylindrical portion (52) of the screw cylinder (5) is caught by the C-shaped ring (15) protruding from the concave groove (14) by the elastic restoring force, the joint ( 1) Cannot proceed to the side. When the screw cylinder (5) is further tightened in this state, the joint (1) is formed into a cylindrical shape by screwing the female thread part (51a) of the screw cylinder (5) and the tip thread part (10) of the joint (1). It is drawn toward the base end side of the main body (2). When the screw cylinder (5) is tightened to the final tightening position, one end face (1a) of the joint (1) comes into pressure contact with the annular base end face (22) of the cylindrical main body (2), and there is friction resistance between them. Arise. As a result, the joint (1) is brought into a second connection state in which the tubular main body (2) is connected to the tubular main body (2) in a relative rotation-preventing state and a retaining state.

  In this embodiment, one end surface (1a) of the joint (1) functions as a pressure contact surface, and the annular base end surface (22) of the cylindrical main body (2) functions as a pressure contact surface. When the screw cylinder (5) is loosened, both are separated from each other, and the joint (1) can be detached from the cylindrical main body (2).

What is shown in FIG. 5 is the joint connection structure of the fourth embodiment.
In this embodiment, the joint (1) has the same structure as the joint (1) employed in the first and third embodiments, and the cylindrical main body (2) has an extended circumference. The cylindrical main body (2) employed in the second embodiment in which the male thread portion (24a) is formed on the surface (24) can be employed.

  Further, the screw cylinder (5) has small inner diameter cylinder portions (51) and (52) formed at both ends, similar to those employed in the second and third embodiments described above, and a large inner diameter cylinder between them. The portion (53) is formed in a shape formed, but in this embodiment, the female screw portions (51a) (52a) are formed on both inner peripheral surfaces of the small inner diameter cylindrical portions (51) (52). Is formed. And before the connection, the screw cylinder (5) is a joint in a state where the female thread part (52a) of the small inner diameter cylindrical part (52) is screwed to the tip thread part (10) of the joint (1) ( 1) It shall be installed on the side.

  The joint (1) and the cylindrical main body (2) were connected in the first connection state as described above, and the connection thread (13) of the joint (1) was screwed into the gas intake cylinder of the gas appliance. Then, the screw cylinder (5) is rotated in the tightening direction. Then, the female screw portion (52a) advances while screwing from the tip screw portion (10) to the male screw portion (24a), and advances in the female screw portion (51a) provided in the small inner diameter cylindrical portion (51). The peak portion (54) located at the tip in the direction comes into contact with the peak portion (10a) of the tip screw portion (10) facing it. After that, when the screw cylinder (5) is further tightened, the female thread portion (52a) of the small inner diameter cylindrical portion (52) of the screw cylinder (5) becomes the male screw of the extended peripheral surface (24) of the cylindrical main body (2). The thread (54a) of the female threaded part (51a) of the small inner diameter cylindrical part (51) is in pressure contact with the threaded part (10a) of the tip threaded part (10) and screwed into the threaded part (24a). 54) and a peak (10a), a frictional resistance is generated, and the joint (1) is connected to the cylindrical main body (2) in a state of preventing relative rotation and in a state of being prevented from coming off.

  That is, in this embodiment, the crest (54) of the female screw portion (51a) provided in the small inner diameter cylindrical portion (51) of the screw cylinder (5) serves as a pressure contact surface and is provided in the joint (1). The crest portion (10a) of the tip screw portion (10) functions as the pressure contact surface.

FIG. 6 shows a joint connection structure according to the fifth embodiment.
The cylindrical main body (2) in this embodiment corresponds to the gas inflow cylinder part (3a) of the conventional gas plug (G) shown in FIG. 7, and the joint (1) connected thereto is as follows: Let it be a flexible pipe coupling for connecting a flexible pipe (41).

  The structure of the cylindrical main body (2) is the same as that of the cylindrical main body (2) as the gas outflow cylindrical portion (3b) in the first embodiment described above. A step portion (25), an annular end surface (25a), an extended peripheral surface (24), an annular base end surface (22), a non-screw-forming region (21), a male screw portion (20) and an open end An O-ring (23) is attached in the vicinity.

The joint (1) for connecting the flexible tube has an annular groove (45) in which one end can be externally connected to the cylindrical main body (2) and the tip of the flexible tube (41) is inserted together with the sealing material (55). A joint body (44) formed to open toward the other end, a tightening cylinder (42) to be screwed into the other end of the joint body (44), and the tightening cylinder (42) And a retainer (43) that presses the flexible tube (41) inserted into the annular groove portion (54) into a retaining state, and the one end of the joint body (44). On the inner peripheral surface on the side, a female screw portion (11) that can be screwed to the male screw portion (20), an annular groove (12) is formed, and on the outer peripheral surface, a tip screw portion ( 10) is formed.
Then, a screw cylinder (5) is mounted on the outer peripheral surface of the joint (1) so as to be screwed into the tip screw portion (10).

  In this embodiment, first, only the joint main body (44) is externally connected to the cylindrical main body (2) as the gas inflow cylinder portion (3a) of the gas stopper (G). The connection procedure is the same as in each of the above embodiments, in which the female screw part (11) is screwed into the male screw part (20) and the female screw part (11) is in the non-screw forming region (21). After making it the 1st connection state accommodated, the said screw cylinder (5) is tightened and the front end surface (50) of a screw cylinder (5) is press-contacted to the annular end surface (25a) of a step part (25). As a result, the joint body (44) is fixed to the tubular main body (2) in a retaining state and in a relative rotation preventing state (second connection state).

  Thereafter, the flexible tube (41) having the retainer (43) and the fastening cylinder (42) attached in advance to the tip portion is inserted from the other end side of the joint body (44), and the flexible tube (41) is inserted into the flexible tube (41). Insert the tube into the annular groove (45) and tighten the fastening tube (42) to the joint body (44) until it reaches the final tightening position, so that the flexible tube is connected to the gas inflow tube (3a) of the gas plug (G). The joint (1) is connected, and the flexible pipe (41) is connected via the flexible pipe joint (1).

Further, the joint main body (44) can be removed from the gas stopper (G) by rotating the screw cylinder (5) in the direction of loosening with a tool.
The joint connection structure employed in each of the above embodiments may be configured to be provided in both the gas inflow cylinder (3a) and the gas outflow cylinder (3b) of the gas plug (G). Even after the piping is connected to the inflow cylinder (3a) and the gas intake cylinder of the gas appliance is connected to the gas outflow cylinder (3b), only the gas plug (G) can be removed and replaced.

Sectional drawing which is a connection structure of the coupling in 1st embodiment of this invention, and shows a 1st connection state. Sectional drawing which is a connection structure of the coupling in 1st embodiment of this invention, and shows a 2nd connection state. Sectional drawing which is a connection structure of the coupling in 2nd embodiment of this invention, and shows a 2nd connection state. Sectional drawing which is a connection structure of the coupling in 3rd Embodiment of this invention, and shows a 2nd connection state. Sectional drawing which shows the connection structure of the coupling in 4th Embodiment of this invention. Sectional drawing which is a connection structure of the coupling in 5th embodiment of this invention, and shows a 2nd connection state. Sectional drawing which shows the connection aspect of the coupling to the conventional gas stopper.

Explanation of symbols

(1) ・ ・ ・ ・ ・ ・ Fitting
(11) ... Male thread
(12) ...
(2) ・ ・ ・ ・ ・ ・ Cylindrical main body (upstream channel or downstream channel)
(20) ... Male thread
(21) ... Screw non-formation area
(5) ・ ・ ・ ・ ・ ・ Locking means (screw cylinder)
(G) ・ ・ ・ ・ ・ ・ Gas stopper

Claims (5)

In the connection structure in which one end of the joint is externally connected to the cylindrical main body constituting the upstream flow path or the downstream flow path of the gas stopper,
A male screw portion is formed in a predetermined range of the outer peripheral surface of the cylindrical main body,
A female threaded portion that can be screwed onto the male threaded portion is formed on the inner peripheral surface of one end of the joint, and an annular concave groove that can accommodate the male threaded portion surrounds the inner threaded side. Formed continuously in the direction,
A screw non-formation area capable of accommodating the female screw portion is provided closer to the base end side than the male screw of the cylindrical main body,
Locking means for connecting the joint and the cylindrical main body in a relative rotation blocking state is provided,
A connection mode in which the male screw portion corresponds to the annular groove, the female screw portion corresponds to the screw non-formation region, and the locking means is in a non-locked state is a first connection state,
A connection mode in which the locking means is locked from the first connection state is a second connection state,
In the first and second connection states, a seal member is provided that holds the joint and the cylindrical main body in an outer airtight state,
The joint connection structure characterized in that the locked state by the locking means can be released as appropriate. The connection structure of the joint according to claim 1, wherein the locking means is a screw cylinder that can be screwed onto an outer peripheral surface of the joint or the cylindrical main body,
The screw tube in the first connection state is in an untightened state, and the screw tube in the second connection state is in a tightening completed state where the screw tube is tightened to a final tightening state,
In the second connection state, a joint connection structure, wherein a pressure contact surface provided on the screw cylinder or the joint is set so as to press-contact a pressure contact surface provided on the cylindrical main body. The connection structure of the joint according to claim 1, wherein the locking means is a screw cylinder that can be screwed onto an outer peripheral surface of the joint or the cylindrical main body,
The screw tube in the first connection state is in an untightened state, and the screw tube in the second connection state is in a tightening completed state where the screw tube is tightened to a final tightening state,
In the second connection state, a joint connection structure, wherein a pressure contact surface provided on the screw cylinder is set so as to press-contact a pressure contact surface provided on the joint. In the connection structure of the joint according to any one of claims 1 to 3,
A concave groove is formed along the circumferential direction on the outer peripheral surface near the open end of the cylindrical main body, and an O-ring as the seal member is accommodated in the concave groove,
In the first and second connection states, a joint connection structure in which the O-ring is set to be pressed against the inner peripheral surface of the joint further on the back side than the annular groove.   A gas stopper in which the joint connection structure according to any one of claims 1 to 4 is provided on both of the cylindrical main body constituting the upstream channel and the downstream channel of the gas stopper.

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