JP5145256B2 - Pipe connection device for container valves - Google Patents

Description

  The present invention relates to an apparatus for connecting piping to a container valve, and more specifically, loosening of a tightening nut without deteriorating the sealing performance between a connecting piping member fixed by a tightening nut and a connection nozzle. It is related with the piping connection apparatus for container valves which can prevent reliably.

  For example, special gas used for manufacturing operations in the semiconductor industry is introduced into a clean room through piping from a gas container arranged outside the clean room. At this time, in the case of a gas type with a large amount of consumption, for example, as shown in FIG. is there. One end of the branch pipe (54) is connected to the gas outlet (55) in the container valve (53) attached to the gas extraction part (52) of each gas container (51), and this branch pipe (54) Is connected to the main pipe (56). Then, by operating the on-off valve (57) provided on the main pipe (56), the stored gas in each gas container (51) is supplied to the gas consuming equipment (not shown) via the filling / supply port (58). Is done.

  The connecting portion between the pipe and the container valve is required to have a reliable sealing property from the viewpoint of maintaining the purity of the special gas and from the viewpoint of security, for example, as shown in FIGS. 7 (a) and 7 (b). The mounting screw part (63) is formed on the outer peripheral surface of the connection nozzle (62) provided in the container valve body (61), and the tightening nut (65) is externally fitted to the nipple (64) which is a connection piping member. In this case, the tightening nut (65) is screwed into the mounting screw portion (63) (see, for example, Patent Document 1, hereinafter referred to as the prior art). The one end side of the nipple (64) is provided with an enlarged diameter part (66), and the above-mentioned enlarged diameter part (66) is screwed to the container valve body (61) side. 66) is pressed toward the container valve body (61) and is received by the connection nozzle (62) through the gasket (67). The connection nozzle (62) has the gas outlet (55) opened, and the other end of the nipple (64) is connected to one end of the branch pipe (54) by welding or the like. The connection nozzle (62) is provided with a groove-shaped engaging portion (68), and the pin-shaped locking portion (69) that engages with the engaging portion (68) (66). The engaging portion (69) is engaged with the engaging portion (68), so that the nipple (64) is prevented from rotating, and thereby the tightening nut (65) is moved along the screw. Thus, the nipple (64) moves forward or backward without rotating, and it is possible to prevent a rotational force from being applied to the gasket (67).

Japanese Patent Laid-Open No. 10-288288

  When the stored gas in the gas container (51) is consumed and emptied, it is transported to the gas filling station and sequentially passes from the filling / supply port (58) through the main pipe (56) and the branch pipe (54). Each gas container (51) is filled with fresh gas and then transported again to the place where the gas is used. When transported between the gas use place and the gas filling station, the gas container (51) is transported in a state where a plurality of the gas containers (51) are accommodated in the curdle (50) or the like. When the vibration is received during the conveyance process, the tightening nut (65) may rotate and loosen with respect to the nipple (64) and the connection nozzle (62). If this connection part is loosened, gas leaks from between the above-mentioned enlarged diameter part (66) and the connection nozzle (62), so this connection part must be checked every time it is transported. It is necessary to tighten. However, the work of confirming a large number of connection points according to the number of accommodation is complicated, and the collection container such as the curdle contains each gas container in a dense manner, so that a work space for retightening is sufficient. In addition, there is a problem that these maintenance operations are not easy.

  In order to solve the above-mentioned problems, it is conceivable that the connection portion has a so-called double nut structure so that the above-mentioned tightening nut does not easily rotate (hereinafter referred to as the prior invention example). That is, for example, as shown in FIG. 5, a connecting screw part (83) is provided on the connection nozzle (82) of the container valve main body (81) to be long, and the container valve main body (81) is provided on the mounting screw part (83). The fastening nut (84) and the fastening nut (85) are screwed in order from the side. Tighten the tightening nut (85) securely to the mounting screw (83), and press the expanded diameter part (87) of the nipple (86), which is the connecting piping member, toward the connecting nozzle (82), then tighten it. The nut (84) is screwed and pressed toward the tightening nut (85), thereby preventing the tightening nut (85) from loosening with respect to the mounting screw portion (83).

  However, in this prior invention example, the fastening nut (84) presses the fastening nut (85) in the direction away from the connection nozzle (82), so the pressing force by the fastening nut (85), that is, There is a risk that the pressing force that presses the enlarged diameter portion (87) of the nipple (86) toward the connection nozzle (82) may be reduced, and the sealing performance between the enlarged diameter portion (87) and the connection nozzle (82) may be reduced. There is a problem that decreases. Further, in this prior invention example, the fastening nut (85) and the fastening nut (84) are screwed onto the mounting screw portion (83), so that the connection nozzle (82) formed with the mounting screw portion (83) is lengthened. There is also a problem that the container valve body (81) is enlarged. These problems also occur when a so-called hard lock nut (registered trademark) having a convex portion or a concave portion whose center axis is decentered by a minute amount around the screw hole is used in the same manner.

  The present invention eliminates the above-mentioned problems and can reliably prevent the tightening nut from loosening without deteriorating the sealing performance between the connecting piping member fixed by the tightening nut and the connecting nozzle. It is to provide a pipe connection device.

In order to solve the above-described problems, the present invention is described as follows, for example, based on FIGS. 1 to 4 showing an embodiment of the present invention.
That is, the present invention relates to a pipe connection device for a container valve, a connection pipe member (4) connected to a connection nozzle (3) of a container valve body (2), and a mounting screw formed on the connection nozzle (3). A tightening nut (6) that is screwed to the portion (5), and a diameter-enlarged portion (10) is provided on one end side of the connecting pipe member (4). The tightening nut (6) is externally fitted, and the enlarged diameter portion (10) is pressed toward the connection nozzle (3) by the screwing of the tightening nut (6). An engagement portion (13) is provided in the connection nozzle (3), and the engagement piping portion (4) is prevented from rotating by engaging with the engagement portion (13). ) Is provided in the above-mentioned enlarged diameter portion (10), and is connected to the container valve pipe connecting device by forming fixing means (14) on the outer peripheral surface of the connecting pipe member (4) On the opposite side of the enlarged diameter part (10) with the nut (6) in between, the above tightening nut The fixing member (16) for preventing the screw (6) from being screwed is disposed, and the fixing member (16) can be fixed to the fixing means (14).

  The connecting piping member is pressed toward the connecting nozzle by screwing the tightening nut toward the container valve main body, and the end provided with the enlarged diameter portion is received by the connecting nozzle. The connecting piping member is prevented from rotating with respect to the connecting nozzle because the engaging portion is engaged with the engaging portion, and the fixing means formed on the connecting piping member is fixed to the fixing member. A member is fixed, and the screw of the tightening nut is prevented by this fixing member. As a result, the tightening nut cannot be screwed in the loosening direction with respect to the mounting screw portion of the connection nozzle.

Here, the pipe member for connection means a pipe member such as a pipe connected to the container valve or a nipple connecting the pipe and the container valve.
The fixing means may be any means as long as it is formed on the outer peripheral surface of the connecting piping member and can fix the fixing member. The fixing member can be fixed to the fixing means and fixed. What is necessary is just to be able to prevent the above-described tightening nut from being screwed in a state, and any of them is not limited to a specific shape or structure.

  As a configuration for preventing the tightening nut from being screwed, for example, a tightening nut is sandwiched between the fixing member and the enlarged diameter portion, or the fixing member is fixed to the tightening nut. Thus, it is possible to prevent the tightening nut from being screwed.

When a clamping nut is sandwiched between the fixing member and the enlarged diameter portion, specifically, for example, the fixing means is constituted by a fixing male screw portion formed on the outer peripheral surface of the connecting piping member. The fixing member can be constituted by a fastening nut that is screwed into the fixing male screw portion.
In this case, the fastening nut may be a single nut. However, the first nut that comes into contact with the tightening nut and the first nut comes into contact with the fastening nut from the opposite side. The second nut is preferable because it can more reliably prevent the tightening nut from being screwed.

  Said 1st nut and 2nd nut form the convex part provided with the taper-shaped outer peripheral surface diameter-reduced according to an axial direction outward around either one screw hole, and the other screw hole's A concave portion is formed around the convex portion, the outer peripheral surface of the convex portion and the inner peripheral surface of the concave portion are decentered by a minute amount with respect to the screw hole, and the other is concentric with the screw hole. It can be. In this case, when the convex portion is fitted into the concave portion, since one of them is eccentric by a minute amount, stress is generated in a direction perpendicular to the axial direction, so that both nuts are firmly fixed to the fixing male screw portion. This is preferable. In addition, in this case, since the first nut is fixed to the fixing male screw portion in cooperation with the second nut, the above-described tightening nut may be rotated accidentally or intentionally in the loosening direction. The first nut cannot be rotated with the tightening nut, and therefore has the advantage that the tightening nut cannot be loosened.

  When a fixing male thread portion is formed as a fixing means on the outer peripheral surface of the connecting piping member, the torque receiving portion is located on the opposite side of the enlarged diameter portion with the fixing means sandwiched between the outer peripheral surface of the connecting piping member. When the fixing member is screwed onto the fixing male screw portion, the torque stress applied to the connecting piping member can be received by fixing the torque receiving portion with a tool such as a wrench. In this case, excessive stress is applied to the engaging portion engaged with the engaging portion, or the end of the connecting piping member received by the connection nozzle is rotated with respect to the connection nozzle by excessive stress. It is preferable that it can be prevented from moving.

When the fixing member is fixed to the tightening nut in order to prevent the tightening nut from screwing, specifically, for example, the fixing means is formed on the outer peripheral surface of the connecting piping member. The outer peripheral surface of the tapered portion is formed into a tapered surface that expands toward one end of the connecting pipe member, and the second threaded portion is connected to the fastening nut. The fixing member is provided with a fastening screw portion that is screwed to the second screw portion, and a fitting hole that is externally fitted to the taper portion. One of the inner peripheral surface and the outer peripheral surface of the tapered portion may be configured to coincide with the central axis of the second screw portion, and the other may be decentered by a minute amount with respect to the central axis.
In this case, the fixing member is fixed to the tightening nut by fitting the fitting concave portion of the fixing member to the tapered portion and screwing the fastening screw portion to the second screw portion. At the same time, the minute amount of eccentricity causes stress to be generated in a direction perpendicular to the central axis of the second screw portion, and the fixing member is securely fixed to the fixing means.

  The container valve main body is not limited to the one attached to the specific gas container, and may be one attached to the gas extraction portion of an arbitrary gas container. However, if the gas container is a collective container such as a cardle or a trailer base, and the container valve body is attached to the gas outlet of each gas container, a large number of connections Since it is possible to omit the looseness confirmation work and the retightening work for the portion, it is preferable that the maintenance work can be greatly simplified.

  Since the present invention is configured and operates as described above, the following effects can be obtained.

  (1) The tightening nut is fixed to the connection nozzle so as not to be screwed through the fixing member, the fixing means, and the connecting piping member in this order. Against loosening. As a result, it is possible to omit the check of looseness of connection points and the tightening work, which have been done every time in the past, and the maintenance work can be simplified.

  (2) Since the fixing member is disposed on the opposite side of the enlarged diameter portion with the tightening nut interposed therebetween, the tightening nut is connected to the connecting nozzle side even if the fixing nut is pressed by this fixing means. Is pressed. As a result, the sealing performance between the connection piping member fixed by the tightening nut and the connection nozzle may be lowered although the fixing member can prevent the tightening nut from being screwed. Absent.

  (3) Since the fixing member is disposed on the opposite side of the diameter-enlarged portion with the tightening nut interposed therebetween, a mounting screw portion for screwing the tightening nut or a connection nozzle formed therewith The container valve main body can be kept small.

It is sectional drawing of the piping connection apparatus for container valves which shows 1st Embodiment of this invention. FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. FIG. 3 is a view corresponding to FIG. 1 and showing a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 1 and showing a fourth embodiment of the present invention. FIG. 2 is a view corresponding to FIG. 1 and showing a prior invention example. It is a piping diagram of the curdle showing the prior art. FIG. 7 (a) is a partially cutaway view of a pipe connection device for a container valve, and FIG. 7 (b) is a cross-sectional view taken along line BB in FIG. 7 (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a container valve pipe connecting device according to a first embodiment of the present invention.
This pipe connection device (1) is formed in a nipple (4) as a connection pipe member connected to a connection nozzle (3) provided in a container valve body (2), and the connection nozzle (3). A fastening nut (6) to be screwed onto the mounting screw portion (5) is provided, and a gasket (7) is disposed between the nipple (4) and the connection nozzle (3). The connection nozzle (3) has a gas outlet (28) of the container valve body (2) opened, and communicates with the flow path in the nipple (4) connected to the connection nozzle (3). It is like that.

  The tightening nut (6) includes a back wall (9) in which an insertion hole (8) is formed, and the nipple (4) is inserted through the insertion hole (8). An enlarged diameter portion (10) is provided on one end side of the nipple (4). Further, one end of the branch pipe (11) is connected to the other end side of the nipple (4) by welding, and this branch pipe (11) constitutes a part of a not-shown cardle pipe. A plurality of gas containers are accommodated in the cardle (not shown), and a container valve main body (2) similar to the above is attached to the gas extraction portion of each gas container. The other end of the branch pipe (11) is connected to a single main pipe disposed in the curdle.

  The tightening nut (6) is externally fitted to the enlarged diameter portion (10), and the enlarged diameter portion (10) is received by the inner wall portion (9). This enlarged diameter portion (10) is provided with a pin-like locking portion (12). The connection nozzle (3) is provided with a groove-like engaging portion (13) with which the engaging portion (12) is engaged.

  On the outer peripheral surface of the nipple (4), a fixing male screw portion (15) is formed as a fixing means (14). The fixing male screw portion (15) has a fastening nut (17) as a fixing member (16) on the opposite side of the enlarged diameter portion (10) with the fastening nut (6) interposed therebetween. Screwed. A torque receiving portion (18) is provided on the outer peripheral surface of the nipple (4) on the opposite side of the enlarged diameter portion (10) across the fixing male screw portion (15).

  The fastening nut (17) is in contact with the first nut (17a) that comes into contact with the fastening nut (6), and comes into contact with the first nut (17a) from the side opposite to the fastening nut (6). It consists of a second nut (17b). Both nuts (17a, 17b) have a so-called hard lock nut (registered trademark) structure. That is, the first nut (17a) is formed with a convex portion (19) around the screw hole on the end surface on the second nut (17b) side, and the outer peripheral surface of the convex portion (19) is formed in the axial direction. It is formed in a taper shape with a diameter reduced in accordance with the outward direction, and is slightly eccentric with respect to the screw hole. On the other hand, the second nut (17b) has a concave portion (20) in which the convex portion (19) is fitted around the screw hole on the end surface on the first nut (17a) side. The inner peripheral surface of the recess (20) is formed concentrically with the screw hole.

Next, the procedure for connecting the pipe to the container valve using the pipe connecting apparatus will be described.
In the state where the nipple (4) is inserted into the insertion hole (8) and the tightening nut (6) is externally fitted to the enlarged diameter portion (10), the locking portion (12) is engaged with the engagement. Engage with the part (13). As a result, the nipple (4) is allowed to move forward and backward with respect to the connection nozzle (3), but cannot rotate about the axis (21) of the connection nozzle (3). In this state, the tightening nut (6) is screwed onto the mounting screw portion (5) and screwed toward the container valve body (2). The expanded diameter portion (10) is pressed toward the container valve body (2) by the back wall portion (9) of the tightening nut (6), and the connection nozzle (3) is connected via the gasket (7). To be accepted.

Next, while supporting the torque receiving portion (18) with a tool such as a wrench, the first nut (17a) of the fastening nut (17) is screwed to the enlarged diameter portion (10) side and tightened. . Thereby, the back wall portion (9) of the tightening nut (6) is sandwiched between the first nut (17a) and the above-mentioned enlarged diameter portion (10), and the tightening nut (6) is screwed. Be blocked.
Thereafter, the second nut (17b) is screwed and tightened toward the first nut (17a), and the convex portion (19) of the first nut (17a) is fitted into the concave portion (20) of the second nut (17b). Combine. Since this convex portion (19) is eccentric by a small amount with respect to the screw hole, the thick side portion enters a wedge shape between the concave portion (20) and the fixing male screw portion (15), and both nuts (17a, 17b ) Receives stress in a direction perpendicular to the axial direction, and is securely fixed to the fixing male screw portion (15). As a result, the nipple (4) cannot rotate with respect to the connection nozzle (3) due to the engagement between the locking portion (12) and the engaging portion (13). The fastening nut (17) is securely fixed to the fixing male screw portion (15) of (4), and the back wall portion (9) is interposed between the fastening nut (17) and the above-mentioned enlarged diameter portion (10). Therefore, the clamping nut (6) cannot be screwed with respect to the connection nozzle (3) and is not loosened with respect to the mounting screw portion (5).

  In the first embodiment described above, the convex portion (19) is formed on the first nut (17a), and the concave portion (20) is formed on the second nut (17b). However, in the present invention, a concave portion may be formed in the first nut (17a), and a convex portion may be formed in the second nut (17b). In the first embodiment, the convex portion (19) is eccentric by a minute amount with respect to the screw hole, and the concave portion (20) is formed concentrically with the screw hole. The convex portion may be formed concentrically with the screw hole, and the concave portion may be decentered by a minute amount with respect to the screw hole.

In the first embodiment, two nuts are used as the fastening nut. However, in the present invention, the fastening nut may be constituted by one nut.
That is, in the second embodiment shown in FIG. 2, as in the first embodiment, a fixing male screw portion (15) is formed as a fixing means (14) on the outer peripheral surface of the nipple (4) as a connecting piping member. However, unlike the first embodiment, a fastening nut (17) comprising one nut is screwed to the fixing male screw portion (15) as a fixing member (16). The fastening nut (17) has a convex portion (19) formed around the screw hole on the end face of the fastening nut (6). The outer peripheral surface of the convex portion (19) is formed in a taper shape that decreases in diameter in the axially outward direction, and is decentered by a minute amount with respect to the screw hole.
On the other hand, the fastening nut (6) is formed with a concave portion (20) in which the convex portion (19) is fitted around the insertion hole (8) on the end surface of the fastening nut (17). is there. The inner peripheral surface of the recess (20) is formed concentrically with the insertion hole (8).

  When the fastening nut (17) is screwed toward the fastening nut (6), the convex portion (19) enters the concave portion (20). Since this convex part (19) is eccentric by a minute amount with respect to the screw hole, the thick side part enters the wedge shape between the concave part (20) and the fixing male screw part (15), and the fastening nut (17 ) Receives stress in a direction perpendicular to the axial direction, and is securely fixed to the fixing male screw portion (15). Other configurations are the same as those of the first embodiment described above, and operate in the same manner and have the same effects.

  In the second embodiment, the fastening nut (17) is formed with the convex portion (19) and the fastening nut (6) is formed with the concave portion (20). However, in the present invention, the fastening nut (17) is formed. A recess may be formed on the fastening nut, and a projection may be formed on the clamping nut (6). As in the first embodiment, instead of decentering the protrusion (19) by a minute amount with respect to the screw hole, the protrusion is formed concentrically with the screw hole, and the recess is screwed. A minute amount may be eccentric with respect to the hole.

  In the first and second embodiments described above, a so-called hard lock nut (registered trademark) structure is used for the fastening nut (17). However, in the present invention, it is only necessary that the fastening nut can be fixed to the fixing male screw portion (15) which is the fixing means (14), and the above-described convex portion (19) and concave portion (20) are not necessarily provided. It may be a thing.

  For example, in the third embodiment shown in FIG. 3, a nut generally used as a fastening nut (17) which is a fixing member (16) is used. Since the fastening nut (17) is securely fastened to the fixing male screw portion (15), the screwing of the fastening nut (6) can be prevented, so that the operation is the same as in the first and second embodiments. And the same effect can be produced. When the second fastening nut (22) is used in combination with the fixing member (16) as shown by the phantom line in FIG. 3, a so-called double nut structure is used. It is preferable that the member (16) can be more securely fixed to the fixing male screw portion (15).

FIG. 4 is a cross-sectional view of a container valve pipe connecting device according to a fourth embodiment of the present invention.
In the first embodiment, the fastening nut (6) is sandwiched between the fastening nut (17), which is the fixing member (16), and the enlarged diameter portion (10). In contrast, in the fourth embodiment, the fixing member (16) is directly fixed to the tightening nut (6).

  That is, in this 4th Embodiment, the taper part (23) is formed in the outer peripheral surface of the nipple (4) which is a connection piping member as a fixing means (14). The outer peripheral surface of this taper part (23) is formed in the taper surface which diameter-expanded to the one end side in which said enlarged diameter part (10) is formed. On the other hand, the tightening nut (6) attached to the connection nozzle (3) of the container valve body (2) is provided with a second screw portion (24) on the side opposite to the connection nozzle (3) side.

  The fixing member (16) includes a fastening screw portion (25) screwed into the second screw portion (24), and a fitting hole (26) fitted to the taper portion (23). The inner peripheral surface of the fitting hole (26) is tapered. The inner peripheral surface of the fitting hole (26) is formed concentrically with the central axis (27) of the second screw portion (24). On the other hand, the outer peripheral surface of the tapered portion (23) is eccentric by a minute amount with respect to the central axis (27).

  The fitting hole (26) of the fixing member (16) is externally fitted to the tapered portion (23), and the fastening screw portion (25) is screwed onto the second screw portion (24) in this state. When it is attached and screwed toward the tightening nut (6), the fixing member (16) is securely fixed to the tightening nut (6). Moreover, since the inner peripheral surface of the fitting hole (26) is decentered by a minute amount with respect to the central axis (27), stress is generated in a direction perpendicular to the central axis (27), and this fixing is performed. The member (16) is securely fixed to the tapered portion (23) which is the fixing means (14). The other configuration is the same as that of the first embodiment and operates in the same manner. Therefore, the tightening nut (6) includes the fixing member (16), the tapered portion (23) of the nipple (4), and the locking portion ( 12) and the engaging portion (13) are sequentially fixed to the connection nozzle (3) in order to prevent the tightening nut (6) from loosening with respect to the mounting screw portion (5).

  In the fourth embodiment, the outer peripheral surface of the tapered portion (23), which is the fixing means (14), is decentered by a minute amount with respect to the central axis (27) of the second screw portion (24). Instead, in the present invention, the outer peripheral surface of the tapered portion (23) is concentric with the central axis (27), and the inner peripheral surface of the fitting hole (26) is minute with respect to the central axis (27). The amount may be eccentric.

  The container valve pipe connecting device described in each of the above embodiments is exemplified to embody the technical idea of the present invention, and includes a connecting pipe member, a tightening nut, a fixing means, a fixing member, and a connection. The shape and structure of the nozzle, the enlarged diameter portion, the engaging portion, the locking portion, etc. are not limited to those of these embodiments, and various modifications can be made within the scope of the claims of the present invention. is there.

For example, in each of the above embodiments, the case where a nipple is used as the connecting piping member has been described. However, in the present invention, instead of the nipple, the end portion of the branch pipe may be used as a connecting piping member.
In each of the above-described embodiments, the case has been described in which the container valve body is attached to a gas container accommodated in the curdle. However, the present invention is applicable not only to container valve bodies attached to each gas container, but also to connecting pipes to container valve bodies attached to a single gas container, of other types of collecting containers such as trailer mounts. Needless to say, it can be done.

  The container valve pipe connecting device of the present invention can reliably prevent the tightening nut from loosening without deteriorating the sealing performance between the connecting pipe member fixed by the tightening nut and the connection nozzle. It is particularly suitable for collecting containers that combine multiple gas containers, such as trailer mounts, to be used to connect the container valves and pipes attached to each gas container. It is also suitably used for connection between a container valve attached to the container and piping.

DESCRIPTION OF SYMBOLS 1 ... Pipe connection apparatus 2 ... Container valve main body 3 ... Connection nozzle 4 ... Connection piping member (nipple)
5 ... Mounting screw part 6 ... Clamping nut
10 ... expanded part
12 ... Locking part
13 ... engagement part
14 ... Fixing means
15 ... Male thread for fixing
16 ... Fixing member
17 ... Nut for fastening
17a ... 1st nut
17b ... Second nut
18 ... Torque receiver
19 ... Convex
20 ... recess
23… Taper part
24 ... Second screw part
25 ... Fastening screw
26 ... Mating hole
27 ... Center axis of the second threaded part (24)

Claims (9)

Connection pipe member (4) connected to the connection nozzle (3) of the container valve body (2), and a tightening nut screwed to the mounting screw portion (5) formed in the connection nozzle (3). (6)
An enlarged diameter portion (10) is provided on one end side of the connecting pipe member (4), and the fastening nut (6) is externally fitted to the enlarged diameter portion (10). ) Is configured such that the expanded diameter portion (10) is pressed toward the connection nozzle (3) by the screwing of
An engagement portion (13) is provided in the connection nozzle (3), and the engagement piping portion (4) is prevented from rotating by engaging with the engagement portion (13). ) Is provided in the above-mentioned enlarged diameter portion (10), pipe connection device for container valve,
A fixing means (14) is formed on the outer peripheral surface of the connecting pipe member (4), and the above-mentioned tightening nut (6) is sandwiched between the above-mentioned expanded diameter portion (10) and the above-mentioned fastening portion. A container member characterized in that a fixing member (16) for preventing screwing of the attached nut (6) is arranged and the fixing member (16) can be fixed to the fixing means (14). Pipe connection device.   The screwing of the tightening nut (6) is prevented by sandwiching the tightening nut (6) between the fixing member (16) and the enlarged diameter portion (10). The pipe connection device for container valves according to 1.   The fixing means (14) includes a fixing male screw portion (15) formed on the outer peripheral surface of the connecting pipe member (4), and the fixing member (16) includes the fixing male screw portion (15). The pipe connection device for a container valve according to claim 2, which is a fastening nut (17) screwed onto the container valve.   The fastening nut (17) is in contact with the first nut (17a) that comes into contact with the fastening nut (6), and comes into contact with the first nut (17a) from the side opposite to the fastening nut (6). The pipe connection device for a container valve according to claim 3, comprising a second nut (17b).   A convex portion (19) having a tapered outer peripheral surface whose diameter decreases in the axial direction outward is provided around one of the screw holes of the first nut (17a) and the second nut (17b). A concave portion (20) into which the convex portion (19) is fitted is formed around the other screw hole, and the outer peripheral surface of the convex portion (19) and the inner periphery of the concave portion (20) are formed. The pipe connection device for a container valve according to claim 4, wherein one of the surfaces is eccentric by a minute amount with respect to the screw hole and the other is concentric with the screw hole.   The torque receiving portion (18) is provided on the outer peripheral surface of the connecting pipe member (4) on the opposite side of the enlarged diameter portion (10) with the fixing means (14) interposed therebetween. The pipe connection device for a container valve according to any one of 5.   The pipe connection device for a container valve according to claim 1, wherein the fixing member (16) is fixed to the tightening nut (6) to prevent screwing of the tightening nut (6). The fixing means (14) includes a tapered portion (23) formed on the outer peripheral surface of the connecting pipe member (4). The outer peripheral surface of the tapered portion (23) is connected to the connecting piping member ( 4) formed on a tapered surface that expands to one end side
The tightening nut (6) has a second threaded portion (24) on the side opposite to the connection nozzle (3) side.
The fixing member (16) includes a fastening screw portion (25) screwed into the second screw portion (24), and a fitting hole (26) fitted outside the taper portion (23). Have
One of the inner peripheral surface of the fitting hole (26) and the outer peripheral surface of the tapered portion (23) coincides with the central axis (27) of the second screw portion (24), and the other The pipe connection device for a container valve according to claim 7, which is eccentric by a minute amount with respect to the central axis (27).   9. The container valve body (2) according to any one of claims 1 to 8, wherein the container valve body (2) is attached to a gas extraction portion of each gas container of a collecting container in which a plurality of gas containers are collected. Pipe connection device for container valves.

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