JP7288661B2 - flexible pipe fittings - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe joint used for connecting accordion-shaped flexible pipes.

As a conventional flexible pipe joint, the one disclosed in Patent Document 1 below includes a joint body having a connection hole formed therein, and a ring-shaped sealing member made of an elastic material disposed in the connection hole of the joint body. have. When connecting a bellows-shaped flexible pipe, the flexible pipe is inserted into the connecting hole of the joint body. At this time, some peaks at the tip of the flexible tube enter the inner periphery of the sealing member. The connection of the flexible tube to the joint is completed by inserting the flexible tube until the tip of the flexible tube abuts the stop surface in the connection hole. At this time, the seal member seals between the outer peripheral surface of the flexible tube and the inner peripheral surface of the connection hole.

JP-A-2000-186792

In the flexible pipe joint disclosed in Patent Document 1, when the flexible pipe is connected, the peak portion of the flexible pipe that has entered the inner periphery of the sealing member advances while crushing the meat portion of the sealing member. As a result, the meat portion of the seal member is biased toward the back side in the insertion direction, and the inner peripheral surface of the seal member bulges on the back side. I was making it difficult.

The flexible pipe joint of the present invention, which has been devised to solve the above-mentioned problems, is a joint body having a connection hole into which a bellows-shaped flexible pipe is inserted, and a ring made of an elastic material arranged in the connection hole. a shaped sealing member. The sealing member seals between the outer peripheral surface of the flexible tube inserted into the connecting hole and the inner peripheral surface of the connecting hole. The sealing member is characterized by having a first concave groove for forming a gap in the radial direction and the axial direction between itself and the inner surface of the connection hole on the outer peripheral portion of the back side of the insertion direction of the flexible pipe. .

According to the above configuration, when the flexible pipe enters the inner periphery of the sealing member, the meat portion of the sealing member that is crushed and tends to bias toward the inner side in the insertion direction is formed by the first concave groove. It escapes to the gap in the outer periphery on the far side of the As a result, the expansion of the inner peripheral surface of the seal member on the far side is suppressed, so that an increase in the insertion load of the flexible tube is suppressed and the flexible tube can be easily inserted.

Preferably, the sealing member has a second recessed groove for forming a radial clearance between itself and the inner peripheral surface of the connection hole on the outer peripheral portion of the front side in the insertion direction of the flexible tube.
According to the above configuration, when the flexible tube is about to enter the inner circumference of the seal member, the front side of the seal member can be bent radially outward by the gap formed by the second groove. As a result, the meat portion of the sealing member can be relieved even on the front side of the sealing member, making it easier to insert the flexible tube.

Preferably, a chamfered portion is formed in at least one of intersections between the inner peripheral surface and both axial end surfaces of the sealing member.
According to the above configuration, the amount of crushing of the seal member is reduced by forming the chamfered portion, and bulging of the seal member is suppressed, so that the ease of inserting the flexible tube can be improved. When the chamfered portion is arranged on the front side in the insertion direction of the flexible pipe, the chamfered portion serves as a guide for inserting the flexible pipe into the inner circumference of the sealing member. It can be inserted smoothly.

Preferably, the seal member is formed symmetrically with respect to a line that is perpendicular to the axis and bisects the seal member into one end side and the other end side.
According to the above configuration, since the one end side and the other end side of the sealing member are symmetrical, the sealing member can be attached to the joint main body from either side. As a result, the mounting of the seal member in the wrong direction does not occur, and the ease of assembly of the flexible pipe joint can be improved.

Preferably, in the seal member, the first concave groove on the back side in the insertion direction extends from the chamfered portion on the same back side in the direction opposite to the insertion direction from the end face on the back side in the insertion direction. deeply formed.
According to the above configuration, there is a portion where the first concave groove and the inner peripheral surface of the seal member face each other in the radial direction, and the effect of bending the seal member in the radially outward direction on the far side can be enhanced. That is, it is possible to enhance the relief effect of the meat portion of the sealing member, and in turn, it is possible to improve the ease of inserting the flexible tube.

ADVANTAGE OF THE INVENTION According to this invention, the joint for flexible pipes which made it easy to insert a flexible pipe can be provided.

1 is a cross-sectional view of a flexible pipe joint according to a first embodiment of the present invention; FIG. Fig. 3 is an enlarged cross-sectional view of the main part of the joint; (A) It is an enlarged cross-sectional view of a seal member arranged in the joint. (B) It is an enlarged view of the B circle part of FIG. 3(A). It is an expanded sectional view which shows the state which connected the flexible pipe to the joint. FIG. 4 is a cross-sectional view of a flexible pipe joint according to a second embodiment of the present invention; FIG. 5 is a cross-sectional view of a flexible pipe joint according to a third embodiment of the present invention;

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. In this embodiment, the present invention is applied to a flexible pipe joint 2 for connecting a bellows-shaped gas flexible pipe 1 (hereinafter abbreviated as a flexible pipe) to a gas appliance or the like.

The joint 2 shown in FIG. 1 is called a one-touch type joint that can be connected by simply inserting the flexible pipe 1 . The joint 2 includes a joint main body 10, a nut 20 (support member) attached to the joint main body 10 and supporting the flexible pipe 1, and a nut 20 (supporting member) arranged in the joint main body 10 to prevent the flexible pipe 1 from slipping out of the joint 2. The main components are an annular locking member 30 and a seal member 40 for sealing between the inner peripheral surface of the joint body 10 and the outer peripheral surface of the flexible pipe 1 .

The flexible tube 1 is composed of a thin metal corrugated tube 1a and a resin-made cladding tube 1b covering the outer periphery of the corrugated tube 1a. A peak portion 1m and a valley portion 1v are formed in the corrugated tube 1a. The flexible tube 1 is connected to the joint 2 with the cladding tube 1b removed for several peaks at the tip of the bellows tube 1a.

As shown in FIGS. 1 and 2, the nut 20 is made of metal such as brass and has a cylindrical shape. 1 to 4, the right end side and the left end side, respectively) have a large diameter portion 21 and a small diameter portion 22 on the other end side. It has a male screw portion 23 having a diameter larger than that of the portion 22 . Although the large-diameter portion 21 is formed to have a circular cross-section in this embodiment, it may be formed to have a hexagonal cross-section. The tip of the nut 20 on the side of the small diameter portion 22 forms a flat abutment surface 24 with which the locking tool 30 can abut.

Inside the nut 20, a through hole 25 is formed for inserting the flexible tube 1 in the axial direction thereof. An annular recess 25a is formed in the inner peripheral surface of one end of the through hole 25, and the annular T-shaped watertight packing 3 is attached to the annular recess 25a.

The large-diameter portion 21 of the nut 20 is formed with an air passage 26 penetrating in the radial direction thereof, and is arranged on the inner side of the annular recess 25a. The air passage 26 is closed with the porous material 4 . This porous material 4 allows permeation of gases and blocks permeation of liquids and solids.

The other end side of the through hole 25 serves as a bellows tube support portion 25b. The inner diameter of the corrugated tube support portion 25b is formed to be equal to the outer diameter of the peak portion 1m of the corrugated tube 1a. The bellows tube support portion 25b supports the bellows tube 1a by causing the ridges 1m of the bellows tube 1a inserted into the through hole 25 to come into contact with its inner peripheral surface.

As shown in FIG. 1, the joint main body 10 is made of metal such as brass and formed in a cylindrical shape, and one end side is formed to have a larger outer diameter than the other end side. A tapered external thread 11 is formed on the outer circumference of the other small-diameter end of the joint body 10 so that the joint body 10 can be attached to a gas appliance or other pipe. At one end of the joint main body 10 having a large diameter, a tool hooking portion 11a for engaging a rotating tightening tool such as a wrench is formed on the outer peripheral surface of a portion adjacent to the tapered male thread 11 . Although the tool hooking portion 11a has a hexagonal cross section, it may have an octagonal cross section or other shapes.

A connection hole 12 to which the flexible pipe 1 is connected is formed at one end of the joint body 10 , and a gas hole 13 having an inner diameter smaller than that of the connection hole 12 is formed at the other end of the joint body 10 . As shown in FIGS. 1 and 2, the connecting hole 12 has a female screw portion 14, a locking protrusion 15, a refractory expansive material accommodation recess 16, and a seal in this order from the opening at one end toward the inner side. A material containing portion 17 and a bellows tube containing portion 18 are provided. The flexible pipe 1 is inserted into the connection hole 12 from the opening on the one end side toward the back side.

The male threaded portion 23 of the nut 20 is screwed into the female threaded portion 14 of the joint body 10 , whereby the nut 20 is attached to the joint body 10 . A threaded portion of the female threaded portion 14 and the male threaded portion 23 is sealed with an adhesive.

The locking protrusion 15 is formed to protrude radially inward from the inner peripheral surface of the connection hole 12 . A flat locking surface 15a facing the contact surface 24 of the nut 20 is formed on the opening side of the connection hole 12 in the locking projection 15. As shown in FIG.

When the nut 20 is screwed onto the joint main body 10 as shown in FIGS. A space S is formed surrounded by the female screw portion 14 and the locking surface 15a.

The locking device 30 is formed by pressing a thin metal plate, and has an annular base portion 31 on the outer peripheral side and a plurality of locking pieces on the inner peripheral side integrally formed with the base portion 31. 32. The locking tool 30 is installed in the connection hole 12 with its axis directed in the same direction as the axis of the connection hole 12 of the joint body 10 .

The base portion 31 has a seat portion 33 on its inner peripheral portion and an outer peripheral plate portion 34 on its outer peripheral portion. The seat portion 33 has a flat surface, and the outer peripheral plate portion 34 is bent in the axial direction of the locking member 30 on the outer peripheral side of the seat portion 33 . In this embodiment, the outer peripheral plate portion 34 is bent toward the opening side of the connection hole 12 in a state where the locking member 30 is installed inside the connection hole 12 .

The outer peripheral plate portion 34 has an inner diameter slightly larger than the outer diameter of the small diameter portion 22 of the nut 20 . As shown in FIG. 2 , part of the outer peripheral plate portion 34 and the seat portion 33 is accommodated in the space S in the installed state of the locking member 30 . The locking device 30 installed in the connecting hole 12 has axial and radial play within the connecting hole 12 .

The plurality of locking pieces 32 extend from the inner peripheral side of the seat portion 33 and are arranged along the circumferential direction of the seat portion 33 with narrow slits 35 therebetween. As shown in FIG. 1, when the locking member 30 is attached to the joint 2, the locking piece 32 is inclined so as to extend radially inward from the seat portion 33 toward the depth of the joint 2. As shown in FIG. there is Although each locking piece 32 has the same shape and the inclination angle of each locking piece 32 is set to the same angle, the shape and inclination angle of each locking piece 32 may be different.

The diameter of the inscribed circle at the tips of the plurality of locking pieces 32 is formed to be smaller than the outer diameter of the crest 1m of the corrugated tube 1a. In the seat portion 33 of the base portion 31, a plurality of relief holes 36 are formed between the proximal end portions of the adjacent locking pieces 32, and are arranged along the circumferential direction.

A refractory expansion O-ring 5 is attached to the refractory expansion material accommodation recess 16 adjacent to the rear side of the locking projection 15 . The refractory expansion O-ring 5 expands when it reaches a temperature at which the seal member 40 disappears due to a fire or the like, and presses into contact with the outer peripheral surface of the corrugated tube 1a inserted into the connection hole 12, thereby pressing the outer peripheral surface of the corrugated tube 1a. and the inner peripheral surface of the connection hole 12 are sealed.

The sealing material accommodating portion 17 is adjacent to the deep side of the refractory expansive material accommodating recessed portion 16, and has a small diameter hole portion 17a, a large diameter hole portion 17b, and a small diameter hole portion 17b, which are sequentially formed from the opening side of the connection hole 12 toward the inner side. It has a hole 17c. The inner diameters of the small-diameter holes 17a and 17c are formed to have the same size. The stepped surface between the small-diameter hole portion 17a and the large-diameter hole portion 17b is a restricting surface 17d facing the inner side, and the stepped surface between the large-diameter hole portion 17b and the small-diameter hole portion 17c faces the opening side. It becomes the contact surface 17e. A restricting surface 17f facing the opening side is formed at the inner edge of the small-diameter hole portion 17c. The regulating surface 17d, the contact surface 17e, and the regulating surface 17f are formed by planes orthogonal to the axis of the connection hole 12. As shown in FIG.

As shown in FIGS. 1 to 3A, the sealing member 40 is formed in a ring shape from an elastic material such as rubber, and is elastically expandable and contractible in diameter. The outer diameter of the sealing member 40 is slightly larger than the inner diameter of the large diameter hole portion 17b of the sealing material accommodating portion 17. As shown in FIG. The inner diameter of the sealing member 40 is smaller than the outer diameter of the crest 1m of the corrugated tube 1a and larger than the outer diameter of the trough 1v. The seal member 40 is accommodated in the seal member accommodating portion 17 in a loose press-fit state with its axis L1 (FIG. 3A) aligned with the axis of the connection hole 12 .

In the seal member 40 in the accommodated state, a concave groove 43 (first concave groove) is annularly formed between the end surface 41 on the other end side in the axial direction (back side in the insertion direction of the flexible tube 1) and the outer peripheral surface 42. It is The recessed groove 43 has a rear end outer peripheral surface 43a and an outer end surface 43b. The end outer peripheral surface 43a extends parallel to the axis L1, and the outer end surface 43b is a plane perpendicular to the axis L1. It is composed of

As shown in FIG. 2, when the rear end surface 41 of the seal member 40 is brought into contact with the regulation surface 17f, the end outer peripheral surface 43a is spaced radially from the inner peripheral surface of the small-diameter hole portion 17c. The outer end surface 43b faces the contact surface 17e with an axial gap therebetween.

In the housed seal member 40, a concave groove 45 (second concave groove) is annularly formed between an end face 44 on one axial end side (the front side in the insertion direction of the flexible tube 1) and the outer peripheral surface 42. ing. The recessed groove 45 has an end outer peripheral surface 45a on the front side in the insertion direction and an outer end surface 45b. The end outer peripheral surface 45a extends parallel to the axis L1, and the outer end surface 45b is perpendicular to the axis L1. It is composed of planes that

As shown in FIG. 2, when the rear end surface 41 is brought into contact with the restricting surface 17f, the outer peripheral surface 45a of the front end in the insertion direction of the flexible tube 1 is aligned with the inner peripheral surface of the small-diameter hole 17a in the radial direction. , and the outer end surface 45b faces the regulation surface 17d with an axial gap therebetween. The seal member 40 moves in the axial direction inside the seal material accommodating portion 17 of the connection hole 12 from the state where the end face 41 on the far side abuts against the regulation surface 17f until the outer end face 45b of the groove 45 abuts against the regulation surface 17d. can move slightly to

In the seal member 40, chamfered portions 47 and 48 are annularly formed at the intersections of the inner peripheral surface 46 and the axial end surfaces 41 and 44, respectively.

As shown in FIG. 3B, the axial length D1 of the far side chamfered portion 47 from the far side end face 41 is the axial length of the end outer peripheral surface 43a of the far side groove 43. It is formed smaller than D2. That is, the concave groove 43 is formed deeper than the chamfered portion 47 from the end surface 41 in the axial direction (the direction opposite to the insertion direction of the flexible tube 1). As a result, there is a portion where the end outer peripheral surface 43a and the inner peripheral surface 46 face each other in the radial direction.

As shown in FIG. 3A, the seal member 40 is formed symmetrically with respect to a line L2 that is perpendicular to the axis L1 and bisects the seal member 40 into one end and the other end.

As shown in FIGS. 1 and 2, the bellows tube accommodating portion 18 is adjacent to the seal member accommodating portion 17 via a stepped portion 19, and is formed sequentially from the opening side of the connection hole 12 toward the inner side. It has a corrugated tube support portion 18a, a reduced diameter portion 18b and a stop surface 18c. The inner diameter of the corrugated tube support portion 18a is formed to be equal to the outer diameter of the peak portion 1m of the corrugated tube 1a. A stopping surface 18c is formed on the far side edge of the reduced diameter portion 18b so as to face the opening side. When the tip of the corrugated tube 1a abuts against the stop surface 18c, the corrugated tube supporting portion 18a supports the corrugated tube 1a by bringing the crests 1m of the corrugated tube 1a into contact with its inner peripheral surface.

Next, a case where the joint 2 is configured by the joint main body 10, the nut 20, the locking member 30 and the seal member 40 configured as described above will be described.
First, the seal member 40 is accommodated in the seal material accommodation portion 17 of the joint body 10 so that the end surface 41 of the seal member 40 abuts the restricting surface 17f, and the fire resistant expansion O-ring 5 is attached to the fire resistant expansion material accommodation recess 16. do.

Next, the locking tool 30 is inserted into the connection hole 12 of the joint body 10 , and the seat portion 33 of the locking tool 30 is arranged on the locking surface 15 a of the locking protrusion 15 . In this state, when the nut 20 fitted with the T-shaped watertight packing 3 and the porous material 4 is screwed into the joint body 10, the state shown in FIGS. is accommodated in the space S, and the threaded portion between the nut 20 and the joint body 10 is sealed with an adhesive. The joint 2 is constructed in this way. The locking device 30 is housed in the joint 2 with radial and axial play, and the seat 33 faces or faces the contact surface 24 of the nut 20 and the locking surface 15a of the joint body 10 . abut.

Since the one end side and the other end side of the seal member 40 in the axial direction are symmetrical when configuring the joint 2, the seal member 40 can be attached to the joint main body 10 from either side. As a result, mounting of the seal member 40 in the wrong direction does not occur, and the assemblability of the joint 2 can be improved.

Next, the process of connecting the flexible pipe 1 to the joint 2 will be described.
As shown in FIG. 1, the flexible tube 1 cut at the trough portion 1v of the bellows tube 1a and with several ridges of the cladding tube 1b removed from the tip is inserted into the through hole 25 from the large diameter portion 21 side of the nut 20. insert inside. Then, the peak 1m at the tip of the bellows tube 1a comes into contact with the surface of the locking piece 32 of the locking device 30, moving the locking device 30 to the inner side of the connection hole 12, and the seat portion 33 of the locking device 30 is engaged. It abuts against the stop surface 15a.

When the peak portion 1m hits the inclined locking piece 32, there is radial play between the outer peripheral plate portion 34 of the locking tool 30 and the outer peripheral surface 22a of the small diameter portion 22 of the nut 20. The axis of the tool 30 is aligned with the axis of the corrugated tube 1a. As a result, the insertion load of the bellows tube 1a is reduced, and the flexible tube 1 can be easily inserted.

When the flexible tube 1 is further inserted, the locking piece 32 is elastically deformed and expanded by the ridges 1m of the bellows tube 1a.

When the flexible tube 1 is further inserted, the tip of the corrugated tube 1a is guided by the chamfered portion 48 of the seal member 40, expands the inner circumference of the seal member 40, and enters the inner circumference. At this time, the bellows tube 1a crushes the meat portion of the sealing member 40 on the front side in the insertion direction, and flexes the sealing member 40 on the same side radially outward, so that the outer peripheral surface 45a of the end portion of the small diameter hole portion 17a is deformed. Bend until it abuts against the inner peripheral surface. As a result, the meat portion that is crushed on the one end side (the front side in the insertion direction) of the seal member 40 can be released.

As the bellows tube 1a is advanced to the inner side, the meat portion of the seal member 40 is biased to the inner side, but the outer end outer peripheral surface 43a and the outer end surface 43b on the inner side come into contact with the inner peripheral surface of the small-diameter hole portion 17c, respectively. The meat portion of the seal member 40 can be released while the back side of the seal member 40 is deflected radially outward until it abuts against the surface 17e. Further, the back end surface 41 of the seal member 40 abuts the bottom surface of the stepped portion 19 on the back side of the seal material accommodating portion 17, thereby allowing the meat portion of the seal member 40 to escape. Therefore, the expansion of the inner peripheral surface 46 on the far side of the seal member 40 is suppressed, so that an increase in the load for inserting the flexible pipe 1 is suppressed, and the flexible pipe 1 can be easily inserted.

In addition, the chamfered portions 47 and 48 suppress the crushing and swelling of the seal member 40 to the extent that the meat portion of the seal member 40 is scraped off. The chamfered portion 48 on the front side in the insertion direction of the flexible tube 1 contributes to ease of insertion of the flexible tube 1 as a guide when inserting the bellows tube 1a.

Further, as shown in FIG. 3, in the seal member 40, the grooves 43 and 45 are formed deeper than the chamfered portions 47 and 48 in the axial direction, respectively, so that the end outer peripheral surfaces 43a and 45a and the inner peripheral surface 46 are formed. By providing a portion where the two face each other, the bending effect is enhanced. Therefore, the relief effect of the meat portion of the seal member 40 is enhanced, and the easiness of inserting the flexible pipe 1 is enhanced.

As shown in FIG. 4, the connection of the flexible tube 1 to the joint 2 is completed by inserting the flexible tube 1 until the tip of the bellows tube 1a abuts against the stop surface 18c of the bellows tube accommodating portion 18. FIG. At this time, the seal member 40 is crushed by the corrugated tube 1a to seal between the outer peripheral surface of the corrugated tube 1a and the inner peripheral surface of the connection hole 12 . Also, the T-shaped watertight packing 3 attached to the inner peripheral surface of the through hole 25 of the nut 20 presses and contacts the outer peripheral surface of the cladding tube 1b, so that the outer peripheral surface of the cladding tube 1b and the inner peripheral surface of the through hole 25 are in contact with each other. It seals the gap.

In addition, the tip of the locking piece 32 of the locking member 30 contacts or faces the inclined outer peripheral surface of the bellows tube 1a, whereby the flexible tube 1 is locked or can be locked. The flexible tube 1 is retained.

Further, the inner peripheral surface of the corrugated tube support portion 18a of the joint body 10 and the inner peripheral surface of the corrugated tube support portion 25b of the nut 20 are brought into contact with the ridges 1m of the corrugated tube 1a, thereby A pipe 1a is supported by a joint 2. As shown in FIG.

Next, a case where a force acts on the flexible pipe 1 in the direction of pulling out from the joint 2 will be described.
When a force acts on the flexible tube 1 in the pull-out direction, the locking tool 30 that locks the outer peripheral surface of the bellows tube 1a is slightly moved, and the seat portion 33 contacts the contact surface 24 of the nut 20. The flexible tube 1 is prevented from coming off. At this time, since the outer end surface 45b of the seal member 40 on one end side (the front side in the insertion direction of the flexible tube 1) faces the restricting surface 17d with a gap in the axial direction, the flexible tube 1 is moved and the bellows is formed. It can move in the withdrawal direction while maintaining the contact state with the tube 1a. As a result, the outer peripheral surface of the corrugated tube 1a and the inner peripheral surface 46 of the seal member 40 do not rub against each other, so that the sealing performance is not impaired.

Next, another embodiment of the invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same reference numerals will be given to the same components, and the description thereof will be omitted.

[Second embodiment]
A second embodiment of the invention will be described below with reference to FIG.
In the first embodiment, the sealing material accommodating portion 17 has a small diameter hole portion 17a, a large diameter hole portion 17b, and a small diameter hole portion 17c from the opening side of the connection hole 12 toward the inner side. , the sealing material accommodating portion 17 has only a small diameter hole portion 17a and a large diameter hole portion 17b. In addition, the bending directions of the outer peripheral plate portion 34 of the locking tool are varied.

Unlike the outer peripheral plate portion 34 (FIG. 1) of the locking device 30 of the first embodiment, the outer peripheral plate portion 34 of the locking device 30A extends in the opposite direction, that is, in the same direction as the extending direction of the locking piece 32. and is bent toward the back side in the insertion direction of the flexible tube 1 .

In the flexible pipe joint 2A of this embodiment, the outer peripheral plate portion 34 of the locking member 30A is not bent toward the nut 20A. There is no need to provide a small diameter portion with a reduced outer diameter. Therefore, the nut 20A has a large-diameter portion 21 on one end side and a male threaded portion 23 smaller in diameter than the large-diameter portion 21 on the other end side, and the tip of the male threaded portion 23 abuts the locking tool 30A. A contact surface 24 is possible.

The locking tool 30A installed in the connection hole 12 has play in the axial direction and the radial direction within the connection hole 12, and the tip of the outer peripheral plate portion 34 can contact the locking surface 15a. In addition, the seat portion 33 can contact the contact surface 24 of the nut 20A.

In the recessed groove 43 on the far side of the seal member 40 accommodated in the seal material accommodating portion 17, the end outer peripheral surface 43a faces the inner peripheral surface of the large diameter hole portion 17b with a gap in the radial direction. The end surface 43b faces the regulation surface 17f with an axial gap therebetween. The gap formed by the concave groove 43 is formed wider in both the radial direction and the axial direction than in the first embodiment. Therefore, a large portion of the meat portion of the seal member 40 can be released.

In this embodiment, the structure of the joint 2 can be simplified, the manufacturing cost can be reduced, and the relief of the meat portion of the seal material 40 can be increased.

[Third embodiment]
A third embodiment of the invention will be described with reference to FIG.
In the first and second embodiments, screwing is used to attach the support members (nuts 20, 20A) to the joint bodies 10, 10A, but in this embodiment, stop rings are used instead of screwing. .

A fixed cylinder 20B is attached as a support member to the joint body 10B of the flexible pipe joint 2B shown in FIG. The inner peripheral surface of the connection hole 12 of the joint main body 10B is not formed with a female screw portion, and a stop ring groove 14a is formed along the entire circumference at a location slightly behind the opening on the one end side.

A medium-diameter portion 23a is provided between the large-diameter portion 21 on one end side and the small-diameter portion 22 on the other end side of the fixed barrel 20B. It is formed to have the same or slightly smaller inner diameter than the opening side of the hole 12 . A watertight O-ring groove 23b and a stop ring groove 23c are formed in order from one end to the other end over the entire circumference of the outer peripheral surface of the medium diameter portion 23a. When the fixed barrel 20B is attached to the joint body 10B, the stop ring grooves 14a and 23c face each other.

A stop ring 6 is attached between the stop ring groove 23c of the fixed barrel 20B and the stop ring groove 14a of the joint body 10B to prevent axial movement of the fixed barrel 20B. The stop ring 6 has a C-shape, is formed elastically so that the diameter can be expanded and contracted, and is attached in a diameter-reduced state from the natural state.

The watertight O-ring 7 fitted in the watertight O-ring groove 23b is crushed by the inner peripheral surface of the opening side end of the connection hole 12, and the outer peripheral surface of the medium diameter portion 23a of the fixed cylinder 20B and the opening of the connection hole 12 are pressed. It is water-tightly sealed with the inner peripheral surface of the side end.

Next, a case where the joint 2B is configured by the joint main body 10B, the fixed cylinder 20B, and the locking member 30 configured as described above will be described.
First, after the seal member 40, the fireproof expansion O-ring 5 and the locking member 30 are accommodated in the joint main body 10B, the watertight O-ring 7 is mounted in the watertight O-ring groove 23b and the stop ring groove 23c in the fixed cylinder 20B. The fixed cylinder 20B is inserted from the small-diameter portion 22 into the opening of the connection hole 12 of the joint main body 10B, with the stop ring 6 being pushed inside.

When the stop ring groove 23c of the fixed cylinder 20B and the stop ring groove 14a of the joint body 10B are opposed to each other, the stop ring 6 expands slightly in diameter and fits into the stop ring groove 14a, and also between the stop ring grooves 14a and 23c. will be located. As a result, the fixed cylinder 20B is prevented from moving in the axial direction of the joint body 10B and is fixed to the joint body 10B. As a result, the fixed cylinder 20B cannot be removed from the joint main body 10B. At this time, the watertight O-ring 7 is pressed against the inner peripheral surface of the opening side end of the connection hole 12 .

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the scope of the invention.
In order to adjust the insertion resistance when the flexible pipe passes through the seal member, the shape of the concave groove and the chamfered portion of the seal member and the shape of the seal material accommodating portion can be changed as appropriate.
In the above embodiment, grooves and chamfers are formed on both ends of the sealing member in the axial direction.
Only the groove may be formed, the groove may be formed only on one side, or the chamfered portion may be formed only on one side.
The structures of the joint main body, the support member, and the locking device may be appropriately combined with the features of the first to third embodiments.
The present invention can also be applied to joints for connecting corrugated tubes other than flexible tubes.
In the above embodiment, the joint main body and the support member (nut, fixed cylinder) are separated, but they may be provided integrally.

INDUSTRIAL APPLICABILITY The present invention can be applied to flexible pipe joints used for connecting accordion-shaped flexible pipes.

Reference Signs List 1 flexible tube 1b bellows tube 1m crest 2, 2A, 2B flexible tube joint 10, 10A, 10B joint main body 12 connection hole 14 female threaded portion 14a stop ring groove 15 locking protrusion 15a locking surface 17 sealing material accommodating portion 17a Small-diameter portion 17b Large-diameter portion 17c Small-diameter portion 17d Control surface 17e Contact surface 17f Control surface 18 Corrugated tube accommodating portion 18a Corrugated tube support portion 18c Stop surface 19 Step portion 20, 20A Nut (support member)
20B fixed cylinder (supporting member)
21 large diameter portion 22 small diameter portion 22a outer peripheral surface 23 male screw portion 23a middle diameter portion 23c stop ring groove 24 contact surface 25 through hole 25b bellows tube support portion 30, 30A locking tool 31 base portion 32 locking piece 33 seat portion 34 Peripheral plate portion 35 Slit 36 Relief hole 40 Sealing member 41 End surface 42 Peripheral surface 43 Groove (first groove)
43a end outer peripheral surface 43b outer end surface 44 end surface 45 concave groove (second concave groove)
45a end outer peripheral surface 45b outer end surface 46 inner peripheral surface 47, 48 chamfered portion L1 axis line L2 bisector S space

Claims (5)

A joint body having a connection hole for inserting a bellows-shaped flexible pipe, and a ring-shaped seal member made of an elastic material disposed in the connection hole, and inserted into the connection hole by the seal member. A flexible pipe joint in which a gap between the outer peripheral surface of the flexible pipe and the inner peripheral surface of the connection hole is sealed,
The seal member has a first concave groove for forming radial and axial clearances between itself and the inner surface of the connection hole on the outer peripheral portion on the far side in the insertion direction of the flexible pipe, and The member has a chamfered portion at the intersection of the inner peripheral surface of the member and the end surface on the far side in the insertion direction,
A joint for flexible pipes, wherein the first concave groove is formed deeper than the chamfered portion from the end surface on the inner side in a direction opposite to the insertion direction. The sealing member has a second concave groove for forming a radial clearance between itself and the inner peripheral surface of the connecting hole on the outer peripheral portion of the front side of the insertion direction of the flexible pipe. Item 1. The flexible pipe joint according to item 1. 3. The sealing member according to claim 1, wherein the sealing member has a chamfered portion at the intersection of the inner peripheral surface of the sealing member and the front end surface in the insertion direction of the flexible tube. flexible pipe fittings. 4. The flexible flexible member according to claim 2, wherein said sealing member is formed symmetrically with respect to a line that is perpendicular to its axis and bisects said sealing member into one end side and the other end side thereof. Fittings for pipes. a joint body having a connection hole formed at one end thereof into which a bellows-shaped flexible pipe is inserted;
a support member that is attached to one end of the joint body, has a through hole communicating with the connection hole, and supports the flexible tube that is inserted from one end of the through hole toward the connection hole; ,
a ring-shaped seal member made of an elastic material arranged in the connection hole,
In the flexible pipe joint in which the sealing member seals between the outer peripheral surface of the flexible pipe inserted into the connecting hole through the through hole and the inner peripheral surface of the connecting hole,
The seal member has a first concave groove for forming radial and axial clearances between itself and the inner surface of the connection hole on the outer peripheral portion on the far side in the insertion direction of the flexible tube,
The support member has a first support portion on the through hole side on the front side in the insertion direction of the seal member, and the joint body is on the connection hole side on the rear side of the seal member in the insertion direction. has two supports,
A joint for a flexible pipe, wherein the flexible pipe inserted into the connection hole is supported by contacting the first and second support portions.

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