JP2022022461A - Separation prevention device and pipe joint comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation prevention device that can sufficiently perform a separation prevention function without affecting sealing performance of a seal member, and a pipe joint comprising the same.

SOLUTION: A separation prevention device comprises: at least a body member 3 externally fitted to an outer peripheral surface 1b of a spigot part 1a, and comprising an inner peripheral part opposed to the outer peripheral surface 1b; a plurality of locking members 6 housed in the inner peripheral part of the body member 3, and locked on the outer peripheral surface 1b of the spigot part 1a by being pressed in an inside diameter direction by the body member 3; and a holding member 51 provided between the locking members 6 and a seal member 4, and for holding the seal member 4 in a sealed state. An interposed body 7 for regulating entry of the locking members 6 in an axial direction is formed between the locking members 6 and an end part 20d of a socket part 20 closer to an outside diameter side than the seal member 4 and the holding member 51. The interposed body 7 comprises an end surface 7a in surface contact with the opening side end surface 20d of the socket part 20.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2022,JPO&INPIT

Description

INDUSTRIAL APPLICABILITY The present invention is provided at a connection point where an insertion portion of the other flow path constituent member is inserted into a receiving portion of one flow path constituent member and is connected in a sealed manner via a ring-shaped seal member. The present invention relates to a detachment prevention device for preventing detachment between flow path constituent members and a pipe joint provided with this device.

As a conventional detachment prevention device for preventing disconnection between the flow path constituent members, a mechanism for locking to the insertion portion is provided inside the main body member externally fitted to the insertion portion constituting the flow path constituent member. Along with a ring-shaped seal member that accommodates the stop member and is externally fitted to the end of the insertion portion and a holding member that holds the seal member in a sealed state, it is directed toward the receiving portion, which is another flow path constituent member, in the direction of the pipe axis. Some are inserted and connected in a sealed manner.

Some such detachment prevention devices connect one end of an extrusion shaft extending in the pipe axis direction toward the inner surface of the receiving portion to a locking member housed inside the main body member, and the main body member of the device is connected. When connecting to the receiving port in the pipe axis direction, the bearing force obtained by the other end of the extrusion shaft coming into contact with the inner surface of the receiving port regulates the entry of the locking member accompanying the main body member in the pipe axis direction. By doing so, the pressing force in the pipe axis direction applied to the locking member is cut off, and in this state, the tapered surface of the inner surface of the main body member that further advances in the tube axis direction is used to push the locking member in the inner diameter direction. There is a device that applies pressure to lock the locking member to the insertion portion (see, for example, Patent Document 1).

JP-A-2005-308182 (Page 4, Fig. 6)

However, in Patent Document 1, a through hole for passing the extrusion shaft connected to the locking member is formed in the sealing member for sealing the flow path constituent member and the holding member for holding the sealing member. Therefore, not only does it affect the sealing performance of the sealing member, but it is not possible to obtain sufficient bearing capacity to regulate the movement of the locking member in the pipe axis direction with the extruded shaft having a small shaft diameter, and the pipe shaft with respect to the locking member. As a result of applying a pressing force in the direction and a pressing force in the inner diameter direction in combination, a problem occurs in the biting that the locking member engages with the outer peripheral surface of the insertion portion, and the desired detachment prevention function cannot be fully exerted. There is a problem that there is a risk.

The present invention has been made by paying attention to such a problem, and is a detachment prevention device capable of sufficiently exerting a detachment prevention function without affecting the sealing property of the sealing member, and a pipe joint provided with this device. The purpose is to provide.

In order to solve the above problems, the detachment prevention device of the present invention is used.
An insertion portion of the other flow path constituent member is inserted into the socket portion of one flow path constituent member via a ring-shaped seal member, and is provided at a connection portion connected in a sealed manner. It is a detachment prevention device that prevents separation from each other.
By being housed in a main body member having an inner peripheral portion facing the outer peripheral surface and having an inner peripheral portion facing the outer peripheral surface, and being accommodated in the inner peripheral portion of the main body member, and pressed in the inner diameter direction by the main body member. At least a locking member that is locked to the outer peripheral surface of the insertion portion and a holding member that is provided between the locking member and the sealing member and holds the sealing member in a sealed state are provided.
An interposition body for restricting the axial entry of the locking member is provided between the locking member and the end of the receiving portion on the outer diameter side of the sealing member and the holding member. It is characterized by.
According to this feature, an interposition body that restricts the axial entry of the locking member is provided between the locking member and the end of the receiving portion on the outer diameter side of the sealing member and the holding member. Therefore, the pressing force in the inner diameter direction is further applied to the locking member by the main body member in a state where the pressing force in the axial direction applied to the locking member is blocked without affecting the sealing performance of the sealing member and the holding member. As a result, it is possible to exert the desired detachment prevention function by the locking member.

The interposition body is characterized in that it is integrally formed with the locking member.
According to this feature, since the locking member is integrated with the interposition body, the locking member can be accurately locked to a predetermined position of the insertion portion.

The interposition body is characterized in that it is formed separately from the locking member.
According to this feature, since the locking member is separate from the interposition body, the locking member can be easily tilted with respect to the insertion portion by itself when an external force in the detaching direction is applied.

The interposition body is characterized in that it is provided at a substantially central portion in the circumferential direction of the locking member.
According to this feature, the locking member can be restricted from entering without tilting in the axial direction by the interposition body provided at the substantially central portion in the circumferential direction.

The pipe fitting of the present invention is
It is characterized by having a receiving pipe which is the one flow path constituent member, an insertion pipe which is the other flow path constituent member, the seal member, and the detachment prevention device.
According to this feature, it is possible to provide a pipe joint that does not affect the sealing performance of the sealing member and the holding member and exhibits the desired detachment prevention function of the locking member.

It is a side sectional view which shows the pipe joint in Example 1. FIG. (A) is a top view of the push ring and the view of the push ring from the rear end side in the first embodiment, and (b) is a sectional view taken along the line AA of the push ring and the view of the push ring from the front end side in the first embodiment. (A) is a view of the first folder member viewed from the rear end side and a sectional view taken along the line BB, and (b) is a view of the second folder member viewed from the front end side and a sectional view taken along the line CC. (A) is a schematic view showing the assembly of the folder unit, (b) is a side sectional view showing the assembled folder unit, and (c) is a view of the locking member viewed from the rear end side. (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the first embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 1 is brought close to the receiving portion, and (b) is a side sectional view showing a state in which the locking member and the insertion portion move in the detaching direction from the state of (a). It is a side sectional view which shows the state which was done. (A) is a view of the first folder portion in the second embodiment as viewed from the rear end side, (b) is a view of the second folder portion as viewed from the front end side, and (c) is a view of the folder DD. It is a cross-sectional view. (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the second embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 2 is brought close to the receiving portion, and (b) is a side sectional view showing a state in which the locking member and the insertion portion move in the detaching direction from the state of (a). It is a side sectional view which shows the state which was done. (A) is a top view of the push ring and the view of the push ring from the rear end side in Example 3, and (b) is a sectional view taken along line EE of the push ring and a view of the push ring from the front end side in Example 3. (A) is a view of the pressing member in the third embodiment as viewed from the rear end side, and (b) is a sectional view taken along the line FF. (A) is an explanatory diagram showing a state in which the locking member is attached to the push ring in the third embodiment, and (b) is an explanatory view showing a state in which the holding member is attached from the state of (a). (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the third embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 3 is brought close to the receiving portion, and (b) is a side sectional view showing a state in which the locking member and the insertion portion move in the detaching direction from the state of (a). It is a side sectional view which shows the state which was done. (A) is a top view of the push ring and the view of the push ring from the rear end side in Example 4, and (b) is a cross-sectional view taken along the line GG of the push ring and a view of the push ring from the front end side in Example 4. (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the fourth embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 4 is brought close to the receiving portion, and FIG. It is a side sectional view which shows the state which made it made. (A) is a top view of the push ring and the view of the push ring from the rear end side in Example 5, and (b) is a sectional view taken along the line HH of the push ring and a view of the push ring from the front end side in Example 5. (A) is a view of the state in which the spacer is attached to the holding member in Example 5 from the rear end side, and (b) is a sectional view taken along the line JJ. (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the fifth embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 5 is brought close to the receiving portion, and (b) is a side sectional view showing a state in which the locking member and the insertion portion move in the detaching direction from the state of (a). It is a side sectional view which shows the state which was done. (A) is a view of a state in which a spacer is attached to the first folder member in Example 6 from the rear end side, and (b) is a cross-sectional view taken along the line KK. (A) is a side sectional view showing a state in which the detachment prevention device and the insertion portion and the receiving portion are aligned in the sixth embodiment, and (b) shows the detachment prevention device and the insertion portion as the receiving portion. It is a side sectional view which shows the inserted state. (A) is a side sectional view showing a state in which the push ring in Example 6 is brought close to the receiving portion, and (b) is a side sectional view showing a state in which the locking member and the insertion portion move in the detaching direction from the state of (a). It is a side sectional view which shows the state which was done.

A form for carrying out the detachment prevention device and the pipe joint provided with the device according to the present invention will be described below based on examples.

The detachment prevention device and the pipe joint according to the first embodiment will be described with reference to FIGS. 1 to 6. The right side of FIG. 1 (the tip end side of the insertion tube) will be referred to as the tip end side, and the left side of FIG. 1 will be described as the rear end side.

As shown in FIG. 1, the opening pipe 1 (the other flow path constituent member) and the receiving pipe 2 (one flow path constituent member) of the present embodiment are, for example, ductiles for water supply buried in the ground. It is made of cast iron, and the inner peripheral surface of the pipeline is covered with a mortar layer. The insertion tube 1 and the reception tube 2 according to the present invention may be made of other metals such as cast iron or steel, or may be made of asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surfaces of the insertion tube 1 and the reception tube 2 are not limited to the mortar layer, and may be coated with, for example, an epoxy resin, or an appropriate material may be coated with powder to the insertion tube 1 and the reception tube. The inner peripheral surface of the tube 2 may be covered. Further, the fluid in the inlet pipe 1 and the inlet pipe 2 is not limited to the clean water of this embodiment, for example, industrial water, agricultural water, sewage, etc., as well as gas or a gas-liquid mixture of gas and liquid. It doesn't matter if there is one.

As shown in FIG. 1, in the pipe joint 10 of the present embodiment, the insertion portion 1a formed at the end of the insertion pipe 1 and the insertion portion 1a formed at the end of the receiving pipe 2 are inserted. It is mainly composed of a receiving portion 20 and a detachment prevention device 11. Further, the detachment prevention device 11 is mainly composed of a push ring 3 (main body member) externally fitted to the outer peripheral surface 1b of the insertion portion 1a, a rubber annular packing 4 (seal member), and an annular folder unit 5. It is configured in.

A plurality of flanges 25 (only one is shown in FIG. 1) are formed in the receiving portion 20 at predetermined intervals in the circumferential direction of the outer peripheral surface of the opening side end portion, and the push ring 3 is formed on each flange 25. A through hole 28 for connecting to the flange 35 of the above is formed. A tapered surface 20c is formed on the inner peripheral surface of the receiving portion 20 so as to gradually reduce the diameter from the opening side end portion inward in the pipe axis direction. The flanges 25 and 35 may be formed integrally in the circumferential direction as well as a plurality of flanges 25 and 35, and may be singular in a substantially circular shape instead of a substantially rectangular shape when viewed from the rear end side, for example.

The packing 4 forms an annular shape that is externally fitted to the outer peripheral surface 1b of the insertion portion 1a, and has a tip portion 4a formed in a substantially circular shape in a cross-sectional view in a natural state and a base portion 4b formed in a substantially trapezoidal shape in a cross-sectional view. And the bottom portion 4c on the side opposite to the one end on which the tip portion 4a is formed (see FIG. 5).

As shown in FIG. 2, the push ring 3 is a cylindrical body having a substantially rectangular outer shape when viewed from the axial direction and having an insertion hole 30 formed in the central portion, and is formed on each of the four corner portions of the push ring 3. The through hole 38 is formed in the axial direction. Further, in the inner peripheral portion of the insertion hole 30 of the push ring 3 into which the insertion portion 1a is inserted, the fitting recess 30a is accommodated in this order from the tip side of the insertion portion 1a (the end side on the receiving portion 20 side). The portion 30b, the tapered portion 30c, and the small diameter portion 30d are continuously formed (particularly, see the cross-sectional view taken along the line AA in FIG. 2B).

The fitting recess 30a can be fitted with an annular portion 52 of the first folder member 51, which will be described later, inside the fitting recess 30a. The fitting recess 30a is formed so that substantially the entire surface thereof is recessed toward the rear end portion except for the outer edge of the tip end portion (end portion on the receiving portion 20 side) of the push ring 3.

The accommodating portion 30b can be fitted with locking members 6, 6, ... Described later in the accommodating portion 30b. Specifically, in the accommodating portion 30b, four groove portions 30g, 30g, ... That bulge in the outer diameter direction are formed at predetermined intervals in the circumferential direction, and the groove portions 30g, 30g, ... The flanges 7, 7, ... Of the stopping members 6, 6, ... Can be fitted.

The tapered portion 30c includes a tapered surface 30e that gradually reduces in diameter from the accommodating portion 30b toward the small diameter portion 30d, and a back end surface 30f that rises in the inner diameter direction from the end portion of the tapered surface 30e on the small diameter portion 30d side. The back end surface 30f rises in a direction orthogonal to the axial direction of the insertion hole 30. The small diameter portion 30d is formed to have a slightly larger diameter than the outer diameter of the insertion portion 1a.

As shown in FIG. 1, the folder unit 5 includes an annular first folder member 51, an annular second folder member 56 having a smaller outer diameter than the first folder member 51, and a first folder member 51 and a second folder unit 5. It is composed of four locking members 6, 6, ... Attached to the folder member 56 at predetermined intervals in the circumferential direction. The first folder member 51 is arranged closer to the receiving portion 20 than the locking member 6, and the second folder member 56 is arranged on the opposite side of the first folder member 51 sandwiching the locking member 6. There is.

As shown in FIG. 3A, the first folder member 51 (holding member) is made of synthetic resin, and has a plate-shaped annular portion 52 and four tubular portions protruding from the annular portion 52 at a substantially right angle. It is formed of 53, 53, .... The annular portion 52 is a tapered surface 52a in which the surfaces on the tubular portions 53, 53, ... Sides are inclined so as to reduce the diameter toward the inner diameter, and the surface on the opposite side of the tapered surfaces 52a is axial. The flat surfaces 52b are orthogonal to each other. Further, four notches 55, 55, ... Are formed on the outer peripheral edge of the annular portion 52 at predetermined intervals.

The tubular portion 53 includes a concave portion 53c having a substantially C-shape with the inner diameter side open when viewed from the axial direction, and the convex portion 58 of the second folder member 56, which will be described later, can be fitted. The tubular portions 53, 53, ... Are arranged at substantially intermediate positions between the adjacent notched portions 55, 55, ....

As shown in FIG. 3B, the second folder member 56 is made of synthetic resin, and has an annular portion 57 having an outer diameter smaller than the outer diameter of the annular portion 52 in the first folder member 51, and an annular portion. It is formed of four convex portions 58, 58, ... Protruding substantially at right angles from 57, and the convex portions 58, 58, ... Are formed from the concave portions 53c, of the tubular portions 53, 53, ... Of the first folder member 51. By fitting to 53c, ..., The first folder member 51 and the second folder member 56 are combined and connected in the axial direction (see FIG. 4). Further, an annular seal member 12 is mounted on the inner diameter side of the annular portion 57 of the second folder member 56 (see FIGS. 5 and 6).

In this embodiment, the first folder member 51 and the second folder member 56 are provided with four tubular portions 53, 53, ... And four convex portions 58, 58, ..., respectively. It may be freely designed according to the quantity, size, etc. of the locking member 6.

As shown in FIG. 4A, when the first folder member 51 and the second folder member 56 are connected, the locking member 6, between the first folder member 51 and the second folder member 56. 6, ... Are sandwiched (only one is shown).

As shown in FIG. 4 (particularly, FIG. 4C), the locking member 6 has a substantially arc shape when viewed from the axial direction, and a plurality of substantially arc-shaped claw portions 61, 61, ... (In this embodiment). A base portion 60 formed in parallel on the inner diameter side, and a flange portion 7 (intermediate body) protruding axially from the tip portion on the outer peripheral edge of the base portion 60 at substantially the center in the circumferential direction of the base portion 60. , Consists of. The locking member 6 is made of ductile cast iron, other metal, or resin, and the flange portion 7 is integrally formed with the base portion 60. That is, in this embodiment, the locking member 6 and the flange portion 7 which is an interposition body are integrally formed.

A first tapered surface 62 that tapers in the opposite direction of the flange portion 7 is provided at the rear end portion of the outer peripheral edge of the base portion 60. Further, a second tapered surface 63 that is inclined so as to be substantially parallel to the tapered surface 52a of the first folder member 51 is provided on the front end side side surface (the end portion on the first folder member 51 side) of the base portion 60. There is.

As shown in FIG. 4B, when the locking member 6 is sandwiched between the first folder member 51 and the second folder member 56, the locking member 6 is integrally formed with the locking member 6. The flange portion 7 is inserted into the notch portion 55 and locked. That is, the locking member 6 is held in a state where the fall is restricted between the first folder member 51 and the second folder member 56.

Next, a series of flows until the insertion tube 1 and the receiving tube 2 are connected in a sealed state by the pipe joint 10 will be described in detail with reference to FIGS. 5 to 6.

First, as shown in FIG. 5A, the folder unit 5 (locking members 6, 6, ..., the first folder member 51 and the second folder member 56) is attached to the insertion portion 1a of the insertion tube 1. It is assumed that the attached push ring 3 and the packing 4 are externally fitted. In the above state, most of the locking members 6, 6, ... Are fitted in the accommodating portion 30b of the push ring 3, and a part of the locking members 6, 6, ... On the rear end side. And the second folder member 56 are housed in the tapered portion 30c. Specifically, the outer peripheral surface of each flange portion 7 integrated with each locking member 6 is close to the inner peripheral surface of the accommodating portion 30b (groove portion 30g), and the first tapered surface 62 and the tapered portion of each locking member 6 are close to each other. The tapered surface 30e in 30c comes into contact with the tapered surface 30e. That is, when the folder unit 5 is externally fitted to the insertion portion 1a, the locking members 6 are arranged closer to the accommodating portion 30b and the tapered portion 30c of the push ring 3, so that the claws of the locking members 6 are clawed. The portions 61, 61, ... Are arranged so as to be separated from each other without contacting the outer peripheral surface 1b of the insertion portion 1a.

Since the locking members 6, 6, ... Are mounted in the push ring 3 while being held by the first folder member 51 and the second folder member 56, the locking members 6, 6 are mounted during the mounting work on the push ring 3. ，… Is prevented from falling and workability is improved.

Next, the shaft of the through hole 38 of the push ring 3 and the shaft of the through hole 28 of the receiving portion 20 are aligned, and the nut 85 is inserted into the through hole 38 and the through hole 28 with the T head bolt 80 inserted into the shaft of the T head bolt 80. Temporarily fix to the tip of the part.

Next, as shown in FIG. 5B, after inserting a predetermined amount of the insertion portion 1a into the receiving portion 20, the push ring 3, the folder unit 5, and the packing 4 are brought close to the receiving portion 20. Move in the axial direction. Then, the tip portion 4a of the packing 4 is pressed against the outer peripheral surface 1b of the insertion portion 1a and the inner peripheral surface of the receiving portion 20. As described above, since the receiving portion 20 is formed with a tapered surface 20c whose diameter is expanded toward the opening side, it is easy to insert the insertion portion 1a into the receiving portion 20, and the axes of the insertion portions 1a are easily inserted. Are positioned to match.

When the insertion portion 1a is inserted into the receiving portion 20 by a predetermined distance and the push ring 3 is moved in the axial direction so as to be close to the receiving portion 20, the end surface 7a of the flange portion 7 becomes the opening side end surface 20d of the receiving portion 20 ( It comes into surface contact with the end portion of the receiving portion), and the movement of the locking member 6 in the receiving portion 20 direction is restricted. When the end surface 7a of the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20, the push ring 3 and the flange 25 of the receiving portion 20 are separated from each other with an insertion allowance. The tapered surface 52a of the first folder member 51 and the second tapered surface 63 of the locking member 6 are in contact with each other.

Since the end surface 7a of the flange portion 7 and the opening side end surface 20d of the receiving portion 20 stand up in a direction orthogonal to the axial direction, the end surface 7a of the flange portion 7 and the opening side end surface 20d of the receiving portion 20 In the case of surface contact, the movement of the locking member 6 in the receiving portion 20 direction can be restricted without tilting the locking member 6 with respect to the insertion portion 1a.

Further, since the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20 having higher strength than the packing 4 and the first folder member 51, the locking member 6 moves in the receiving portion 20 direction. It can be regulated stably.

Further, since the flange portion 7 is provided at a substantially central portion in the circumferential direction of the locking member 6, when the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20, the locking member 6 is subjected to the flange portion 7. On the other hand, it is possible to suppress the action of a biased force. Specifically, since the reaction force generated when the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20 can be transmitted substantially evenly to the entire locking member 6, the circumferential direction of the locking member 6 can be transmitted. It is possible to suppress an eccentric load that tends to rotate in the radial direction or the axial direction around the end side of the.

Further, since the flange portion 7 is housed in the groove portion 30 g of the push ring 3, the displacement of the flange portion 7 is restricted when the insertion portion 1a is inserted into the receiving portion 20. That is, since the flange portion 7 is guided by the groove portion 30 g of the push ring 3, the flange portion 7 moves toward the receptacle portion 20 of the locking member 6 without biasing the flange portion 7 to the opening side end surface 20d of the socket portion 20. Can be suitably regulated.

Next, as shown in FIG. 6A, the push ring 3 is further moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As described above, since the locking member 6 is restricted from moving on the receiving portion 20 side due to the surface contact between the flange portion 7 and the opening side end surface 20d of the receiving portion 20, the second folder is accompanied by this. The member 56 does not move and stays behind the locking member 6.

On the other hand, the first folder member 51 moves so that the annular portion 52 pushes the bottom portion 4c of the packing 4 against the receiving portion 20 side as the push ring 3 moves toward the receiving portion 20 side. As a result, the base portion 4b of the packing 4 is pressed against the tapered surface 20c of the receiving portion 20 and the outer peripheral surface of the insertion portion 1a, and the space between the insertion portion 1a and the receiving portion 20 is sealed. Further, since the annular portion 52 of the first folder member 51 is sandwiched between the push ring 3 and the opening side end surface 20d of the receiving portion 20, the insertion portion 1a and the receiving portion 20 are sealed by the packing 4. The state is retained.

That is, only the first folder member 51 arranged on the receiving portion 20 side of the locking member 6 moves to the receiving portion 20, and the movement of the second folder member 56 is restricted, so that the first folder member The 51 and the second folder member 56 move so as to be relatively separated from each other and separate from each other. Specifically, the convex portions 58, 58, ... Of the second folder member 56 slide in the concave portions 53c, 53c, ... Of the tubular portions 53, 53, ... Of the first folder member 51 and the first folder member 51. The connection interval with the second folder member 56 is widened. Therefore, the tapered surface 52a of the first folder member 51 and the second tapered surface 63 of the locking member 6 are separated by the dimension L1 in the axial direction.

Further, when the push ring 3 moves to the receiving portion 20 side in a state where the movement of the locking member 6 on the receiving portion 20 side is restricted, the first tapered surface 62 of the locking member 6 and the tapered surface 30e of the push ring 3 become Will slide, which will push the locking member 6 in the inner diameter direction. That is, as a result of the movement of the push ring 3 to the receiving portion 20 being converted into a pressing force that presses the locking member 6 in the inner diameter direction by sliding between the first tapered surface 62 and the tapered surface 30e, the locking member 6 The claw portions 61, 61, ... Will bite into the outer peripheral surface 1b of the insertion portion 1a. Since the flange portion 7 bites into the outer peripheral surface 1b of the insertion portions 1a of the claw portions 61, 61, ... With the locking member 6 restricted from entering in the axial direction, the end portion on the tip end side of the insertion tube 1 is formed. Effective biting can be realized while preventing the possibility of contacting the inner peripheral side portion of the receiving portion 30 and making it difficult to insert, and the biting is concentrated on the claw portion 61 on the rear end side of the claw portions 61, 61, ... , Achieve the desired initial state bite.

In this way, the flange portion 7 that restricts the axial entry of the locking member 6 is the opening side end surface of the locking member 6 and the receiving portion 20 on the outer diameter side of the packing 4 and the first folder member 51. Since it is provided between the 20d and the locking member 6, the locking member 6 and the flange portion 7 do not come into direct contact with the packing 4. Therefore, it is possible to prevent the packing 4 held by the first folder member 51 from affecting the sealing performance, and it is possible to suppress the inclination of the locking member 6 and the like to provide the locking member 6 with a desired detachment prevention function. It can be demonstrated.

Since the flange portion 7 does not come into direct contact with the packing 4, the degree of freedom in designing the shape and size of the flange portion 7 is increased. For example, the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20. The area can be increased. Thereby, the movement of the locking member 6 to the receiving portion 20 can be stably regulated.

Further, since the flange portion 7 is integrally formed with the locking member 6, the locking member 6 can be accurately locked to a predetermined position on the outer peripheral surface 1b of the insertion portion 1a. Specifically, since the flange portion 7 is integrally formed with the locking member 6, the reaction force generated when the flange portion 7 comes into contact with the opening side end surface 20d of the receiving portion 20 is the locking member 6. Since the pressing force for pressing the locking member 6 in the inner diameter direction is not dispersed, the locking member 6 can be accurately locked to the outer peripheral surface 1b of the insertion portion 1a.

Further, as described above, since the movement of the receiving portion 20 side is restricted while the inclination of the locking member 6 is restricted, the claw portions 61, 61, ... Of the locking member 6 are the insertion portions. It bites into the outer peripheral surface 1b of 1a substantially evenly. In other words, it is possible to prevent the claw portions 61, 61, ... Of the locking member 6 from locally biting into the outer peripheral surface 1b of the insertion portion 1a.

Next, as shown in FIG. 6B, a case where an unexpected external force such as an earthquake acts in a direction in which the insertion portion 1a is separated from the reception portion 20 will be described. Due to this external force, the locking member 6 moves in the direction away from the receiving portion 20 together with the insertion portion 1a. Specifically, the tapered surface 52a of the first folder member 51 and the second tapered surface 63 of the locking member 6 are separated by a dimension L2 larger than the dimension L1 in the axial direction (L1 <L2).

In this way, since the locking member 6 moves in the direction away from the receiving portion 20 together with the insertion portion 1a, the locking member 6 is further pressed in the inner diameter direction by the tapered surface 30e of the push ring 3, and the claws are clawed. The portion 61 further bites into the outer peripheral surface 1b of the insertion portion 1a. At this time, the claw portion 61 bites into the claw portion 61 due to the wedge effect and the tilting effect of the locking member 6 centered on the rear end portion side claw portion 61, and exerts an effective detachment prevention force. Since the biting force is concentrated on the claw portion 61 in the initial state, the biting force of the tip side claw portion 61 does not become excessive due to the tilt of the locking member 6, and the claw portions 61, 61, ... While exhibiting, it is possible to suppress the influence on the inner peripheral surface of the pipe (for example, the mortar layer). Since the cutting edge of the claw portion 61 of the locking member 6 is inclined with respect to the radial direction (direction orthogonal to the axial direction) so as to face the receiving portion 20 side, the locking member 6 is with the insertion portion 1a. It is possible to exert a wedge effect in the direction of detachment from the receiving portion 20.

Further, when the insertion portion 1a moves in the direction of detaching from the receiving portion 20, the sealing member 12 is narrowed by the annular portion 57 of the second folder member 56 and the back end surface 30f of the push ring 3, and the push ring 3 and the insertion portion are inserted. The space between the portion 1a and the portion 1a is sealed. Further, even if the locking member 6 is moved as described above, the first folder member 51 continues to hold the packing 4 without moving, so that the sealing property of the packing 4 can be maintained.

Further, since each locking member 6 is fitted in the groove portion 30g of the push ring 3, when a force for rotating in the circumferential direction is applied to the insertion tube 1, the locking member 6 is regulated by the groove portion 30g. The rotation of the insertion tube 1 can be prevented.

In this embodiment, an embodiment in which four locking members 6 are used has been exemplified, but the present invention is not limited to this, and the number of locking members is appropriately adjusted according to the outer diameter of the insertion portion and the like. Can be changed. Furthermore, although the locking member 6 is provided with three claw portions 61, 61, ..., The number of claw portions may be appropriately changed as long as at least one is provided, or the claw portion may be provided. The shape can be changed freely.

Further, in this embodiment, since the ductile cast iron insertion tube 1 and the socket tube 2 are used, a plurality of locking members 6 are used in order to enhance the detachment prevention function. For example, the insertion tube is used. When the receiving tube is made of a synthetic resin such as vinyl chloride, polyethylene, or polyolefin, one locking member continuous in the circumferential direction may be used so as to have a substantially C-shape in front view.

Next, the detachment prevention device and the pipe joint according to the second embodiment will be described with reference to FIGS. 7 to 9. The same components and the same components as those in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The locking member 6 in this embodiment is held by the folder 250 (see FIG. 8). As shown in FIG. 7, the folder 250 has a first folder portion 251 (holding member) arranged on the front end side of the locking member 6 and a second folder 250 arranged on the rear end side of the locking member 6. It is mainly composed of a folder unit 256 and a plurality of connecting units 253, 253, ... That connect the first folder unit 251 and the second folder unit 256. The first folder portion 251 and the second folder portion 256 and the connecting portions 253, 253, ... Are integrally formed of synthetic resin.

The first folder portion 251 forms an annular shape, and four notched portions 55, 55, ... Are formed on the outer peripheral edge thereof at predetermined intervals. The second folder portion 256 has an annular shape having an outer diameter smaller than the outer diameter of the first folder portion 251, and the surface of the second folder portion 256 on the first folder portion 251 side has a protrusion. The portions 256a, 256a, ... Are formed so as to project at predetermined intervals in the circumferential direction (8 in this embodiment).

Eight connecting portions 253, 253, ... Are provided in this embodiment, and four sets are arranged in the circumferential direction so as to form a pair separated from each other by substantially the same width as the circumferential length of the locking member 6. There is. The locking member 6 can be accommodated between the pair of connecting portions 253 and 253.

Further, the connecting portion 253 includes a plate-shaped portion 253a forming a plate shape and a bulging portion 253b protruding toward the other connecting portion 253 forming a pair. The bulging portion 253b is adapted to fit into recesses (not shown) formed at both ends of the locking member 6 in the circumferential direction, and the locking member 6 is formed between the pair of connecting portions 253 and 253. Is accommodated, it is possible to prevent the locking member 6 from moving in the circumferential direction.

The plate-shaped portion 253a is compared with other parts so that it can be broken or stretched by applying a predetermined or more tensile force in the axial direction (the direction in which the first folder portion 251 and the second folder portion 256 are separated from each other). Is fragilely formed.

When connecting the insertion port 1 and the receiving tube 2, as shown in FIG. 8A, the insertion portion 1a is connected to the locking members 6, 6, ... And, as in the above embodiment. The push ring 3 to which the folder 250 is attached and the packing 4 are fitted externally, and the insertion portion 1a is arranged in the vicinity of the opening of the receiving portion 20. When the locking members 6, 6, ... Are attached to the folder 250, the ridges 256a, 256a, ... Restrict the movement of the locking members 6, 6, ... In the inner diameter direction. .. That is, the locking members 6, 6, ... Are held with respect to the folder 250 without falling.

Next, as shown in FIG. 8B, when the insertion portion 1a is inserted into the socket portion 20 by a predetermined distance and the push ring 3 is moved in the axial direction so as to be close to the receptacle portion 20, the flange portion 7 is moved. It abuts on the opening side end surface 20d of the receiving portion 20, and the movement of the locking member 6 in the receiving portion 20 direction is restricted.

Next, as shown in FIG. 9A, the push ring 3 is further moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As a result, the first folder portion 251 and the second folder portion 256 move so as to be relatively separated from each other, so that the plate-shaped portion 253a (fragile portion) of each of the above-mentioned connecting portions 253 breaks or extends and is engaged. The claw portions 61, 61, ... Of the stop member 6 bite into the outer peripheral surface 1b of the insertion portion 1a. At this time, since the first folder portion 251 is sandwiched between the push ring 3 and the opening side end surface 20d of the receiving portion 20, the sealed state of the insertion portion 1a and the receiving portion 20 by the packing 4 is maintained. To.

Then, as shown in FIG. 9B, when an unexpected external force such as an earthquake acts in the direction in which the insertion portion 1a is separated from the receiving portion 20, the locking member 6 is further inserted by this external force. By further biting into the outer peripheral surface 1b of the portion 1a, a wedge effect and a tilting effect are exhibited, and the insertion tube 1 and the receiving tube 2 are prevented from being separated from each other.

Next, the detachment prevention device and the pipe joint according to the third embodiment will be described with reference to FIGS. 10 to 14. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 10, the push ring 303 of the present embodiment has an insertion hole 330 through which the insertion portion 1a is inserted, and the inner peripheral portion of the insertion hole 330 accommodates the locking member 6. A plurality of groove portions 310 are formed apart from each other in the circumferential direction (four in this embodiment). The accommodating groove 310 is composed of an accommodating portion 330b accommodating the base 60 of the locking member 6 and a groove portion 330g accommodating the flange portion 7 of the locking member 6.

Further, the tip portion of the push ring 3 is formed with a fitting recess 330a and a plurality of convex portions 302 for holding the holding member 351 which will be described later. The plurality of convex portions 302 are arranged so as to form a substantially annular shape in front view at predetermined intervals. Further, a small diameter portion 330d is formed at the rear end portion of the push ring 3.

The accommodating portion 330b includes a tapered surface 330e that gradually reduces in diameter from the accommodating portion 330b toward the small diameter portion 330d, and a back end surface 330f that rises in the inner diameter direction from the end portion of the tapered surface 330e on the small diameter portion 330d side. ..

As shown in FIG. 11, the pressing member 351 as a holding member for holding the packing 4 used in this embodiment in a sealed state is formed in an annular shape by a flat plate material made of synthetic resin. Four notches 355,355, ... Are formed on the outer peripheral edge of the pressing member 351 at predetermined intervals. Further, the end surface on the rear end side of the presser member 351 has a tapered surface 352a that is inclined so as to reduce the diameter toward the inner diameter, and the end surface on the tip end side of the presser member 351 is orthogonal to the axial direction. The flat surface is 352b.

As shown in FIG. 12A, each accommodating groove 310 accommodates a locking member 6. When the locking member 6 is accommodated in the accommodating groove 310, an elastic member 304 made of an elastic member is formed between the circumferential end of the accommodating groove 310 and the circumferential end of the locking member 6. Arranged. Since the elastic member 304 holds the position of the locking member 6 in the accommodating groove 310 to prevent movement, workability is improved.

As shown in FIG. 12B, the pressing member 351 has a fitting recess 330a in a state where the notch portions 355, 355, ... Are aligned with the flange portion 7 of the locking member 6 accommodated in each accommodating groove portion 310. Placed in. According to this, it is restricted that the pressing member 351 is displaced in the circumferential direction by the notch portions 355, 355, ... In contact with the flange portion 7. Further, when the pressing member 351 is arranged in the fitting recess 330a, the outer peripheral surface of the pressing member 351 is arranged inside the convex portions 302, 302, ..., whereby the pressing member 351 is displaced in the radial direction. Can be prevented.

When connecting the opening tube 1 and the receiving tube 2, the locking members 6, 6, ... And the pressing member 351 are attached as shown in FIG. 13A, as in the above embodiment. The push ring 303 and the packing 4 are fitted onto the insertion portion 1a, and the insertion portion 1a is arranged in the vicinity of the opening of the receiving portion 20.

Next, as shown in FIG. 13B, when the insertion portion 1a is inserted into the socket portion 20 by a predetermined distance and the push ring 303 is moved in the axial direction so as to be close to the receptacle portion 20, the flange portion 7 is moved. It abuts on the opening side end surface 20d of the receiving portion 20, and the movement of the locking member 6 in the receiving portion 20 direction is restricted.

Next, as shown in FIG. 14A, the push ring 303 is further moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As a result, the pressing member 351 moves so as to press the packing 4 toward the receiving portion 20, and the locking member is slid by the tapered surface 330e of the accommodating groove portion 310 and the first tapered surface 62 of the locking member 6. The claw portions 61, 61, ... Of No. 6 bite into the outer peripheral surface 1b of the insertion portion 1a. Further, since the pressing member 351 is sandwiched between the pressing ring 303 and the opening side end surface 20d of the receiving portion 20, the sealed state of the insertion portion 1a and the receiving portion 20 by the packing 4 is maintained.

Since the locking member 6 and the flange portion 7 are accommodated in the accommodating groove portion 310, the push ring 303 is moved to the receiving portion 20 side in a state where the movement of the locking member 6 in the receiving portion 20 direction is restricted. In such a case, the claw portions 61, 61, ... Are preferably guided by the accommodating groove portion 310 so as to bite into the outer peripheral surface 1b of the insertion portion 1a. Further, since the elastic member 304 that holds the position of the locking member 6 in the accommodating groove portion 310 is elastically deformable, it is possible to suppress the relative proximity movement between the locking member 6 and the accommodating groove portion 310. ..

Then, as shown in FIG. 14B, when an unexpected external force such as an earthquake acts in the direction in which the insertion portion 1a is separated from the receiving portion 20, the locking member 6 is further inserted by this external force. By further biting into the outer peripheral surface 1b of the portion 1a, a wedge effect and a tilting effect are exhibited, and the insertion tube 1 and the receiving tube 2 are prevented from being separated from each other.

Next, the detachment prevention device and the pipe joint according to the fourth embodiment will be described with reference to FIGS. 15 to 17. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 15, the push ring 403 used in this embodiment has substantially the same configuration as the push ring 3 of the first embodiment except for the configuration of the notch groove 404. The push ring 403 has notched grooves 404, 404, ... On the outer diameter side of the groove portions 30 g, 30 g, ... At the end portion on the distal end side.

When connecting the insertion tube 1 and the receiving tube 2, as shown in FIG. 16A, the folder unit 5 (locking members 6', 6', ..., the first folder member 51 and the first folder unit 5 are connected. The push ring 403 to which the 2 folder member 56) is attached and the packing 4'are fitted outside the insertion portion 1a of the insertion tube 1, and the insertion portion 1a is arranged in the vicinity of the opening of the receiving portion 20.

The packing 4'used in this embodiment has a notch step portion 4d formed on the inner peripheral side of the bottom portion 4c'side end portion (end portion on the opposite side to the receiving portion 20). An annular packing holder 13 formed over the notch step portion 4d, which is the inner peripheral edge thereof, and the outer peripheral edge of the bottom portion 4c'is fixed to the bottom portion 4c'. Furthermore, the locking member 6'used in this embodiment has a flange portion 7'formed so as to be located on the outer diameter side of the outer peripheral surface of the packing holder 13.

Next, as shown in FIG. 16B, when the insertion portion 1a is inserted into the socket portion 20 by a predetermined distance and the push ring 403 is moved in the axial direction so as to be close to the receptacle portion 20, the flange portion 7' Abuts on the opening side end surface 20d of the receiving portion 20, and the movement of the locking member 6'in the receiving portion 20 direction is restricted.

Next, as shown in FIG. 17A, the push ring 403 is moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As a result, the first folder member 51 moves so as to press the packing holding body 13 and the packing 4 toward the receiving portion 20, and also the tapered surface 33e of the push ring 3 and the first tapered surface 62 of the locking member 6'. The claw portions 61, 61, ... Of the locking member 6'bite into the outer peripheral surface 1b of the insertion portion 1a due to the sliding of the locking member 6'.

Further, since the push ring 403 is provided with the notch groove 404 described above, the proximity movement between the push ring 403 and the receiving portion 20 is not hindered by the flange portion 7'. As a result, the first folder member 51 is sandwiched between the push ring 403 and the opening side end surface 20d of the receiving portion 20, so that the sealing state between the insertion portion 1a and the receiving portion 20 by the packing 4'is maintained. Will be done.

Then, as shown in FIG. 17B, when an unexpected external force such as an earthquake acts in the direction in which the insertion portion 1a is separated from the socket portion 20, the locking member 6'is further inserted by this external force. By further biting into the outer peripheral surface 1b of the mouth portion 1a, a wedge effect and a tilting effect are exhibited, and the insertion tube 1 and the receiving tube 2 are prevented from being separated from each other.

Next, the detachment prevention device and the pipe joint according to the fifth embodiment will be described with reference to FIGS. 18 to 21. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 18, the push ring 503 used in this embodiment has substantially the same configuration as the push ring 303 of the third embodiment except for the configuration of the notch groove 504. The push ring 503 is formed with notched grooves 504, 504, ... On the outer diameter side of the groove portions 330 g, 330 g, ... At the end portion on the tip end side.

As shown in FIG. 19, the pressing member 551 as a holding member for holding the packing 4 used in this embodiment in a sealed state is formed in an annular shape by a flat plate material made of synthetic resin. Four notches 555, 555, ... Are formed on the outer peripheral edge of the pressing member 551 at predetermined intervals. Further, the front end surface and the rear end surface of the presser member 551 are flat surfaces.

A spacer 70 (intermediate body) having an L-shaped cross-sectional view is arranged in the vicinity of the notch portions 555, 555, ... In the pressing member 551. The spacer 70 has a first plate portion 71 on a substantially arc arranged at the rear end portion of the pressing member 551, and the tip side (receptacle portion 20) from the outer peripheral edge in the substantially central portion in the circumferential direction of the first plate portion 71. It is composed of a second plate portion 72 extending to the side). In this modification, the spacer 70 is temporarily attached to the rear end portion of the pressing member 551 by a second plate portion 72 with an adhesive layer (not shown) having a weak adhesive force. The spacer 70 may be separable from the presser member 551 and may not necessarily be attached to the presser member 551.

When connecting the opening tube 1 and the receiving tube 2, the locking members 560, 560, ... And the pressing member 551 are attached as shown in FIG. 20A, as in the above embodiment. The push ring 503 and the packing 4'are fitted to the insertion portion 1a, and the insertion portion 1a is arranged in the vicinity of the opening of the receiving portion 20. The locking member 560 used in this embodiment has substantially the same configuration as that of the above embodiment except that a spacer 70 is configured instead of the flange portion.

Next, as shown in FIG. 20 (b), when the insertion portion 1a is inserted into the socket portion 20 by a predetermined distance and the push ring 503 is moved axially so as to be close to the socket portion 20, the spacer 70 becomes the first. The two plate portions 72 abut on the opening side end surface 20d of the receiving portion 20, and the movement of the locking member 560 in the receiving portion 20 direction is restricted accordingly.

Next, as shown in FIG. 21A, the push ring 503 is moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As a result, the pressing member 551 is peeled off from the first plate portion 71 of the spacer 70 and moves so as to press the packing holding body 13 and the packing 4'toward the receiving portion 20 side, and is engaged with the tapered surface 330e of the pressing ring 503. By sliding the stop member 560 with the first tapered surface 62, the claw portions 61, 61, ... Of the locking member 560 bite into the outer peripheral surface 1b of the insertion portion 1a.

Further, since the push ring 503 is provided with the notch groove 504 described above, the spacer 70 does not hinder the proximity movement between the push ring 503 and the receiving portion 20. As a result, the pressing member 551 is sandwiched between the pressing ring 503 and the opening side end surface 20d of the receiving portion 20, so that the sealing state between the insertion portion 1a and the receiving portion 20 by the packing 4'is maintained. ..

Then, as shown in FIG. 21B, when an unexpected external force such as an earthquake acts in the direction in which the insertion portion 1a is separated from the receiving portion 20, the locking member 560 is further inserted by this external force. By further biting into the outer peripheral surface 1b of the portion 1a, a wedge effect and a tilting effect are exhibited, and the insertion tube 1 and the receiving tube 2 are prevented from being separated from each other.

As described above, since the spacer 70 is formed separately from the locking member 560, the locking member 560 is used alone when an external force in the detaching direction acts on the insertion tube 1 and the receiving tube 2. It moves so as to be close to the push wheel 503. That is, even if the locking member 560 tilts when an external force in the detaching direction acts on the insertion tube 1 and the receiving tube 2, the spacer 70 hinders the proximity movement of the locking member 560 to the push ring 503. Can be prevented.

Next, the detachment prevention device and the pipe joint according to the sixth embodiment will be described with reference to FIGS. 22 to 24. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The push ring 403 used in this embodiment has substantially the same configuration as that in the fourth embodiment. Further, as shown in FIG. 22, spacers 70', 70', ... Are attached to the notches 55, 55, ... Of the first folder member 51. Specifically, the spacer 70'has a first plate portion 71'fitted to the notch portion 55 and a second plate portion 72 extending from the outer peripheral edge of the first plate portion 71' to the tip end side (receptacle portion 20 side). 'And is composed of.

When connecting the opening tube 1 and the receiving tube 2, as shown in FIG. 23A, the locking members 660, 660, ..., The first folder member 51 and the same as in the above embodiment. The push ring 403 to which the second folder member 56 is attached and the packing 4'are fitted onto the insertion portion 1a, and the insertion portion 1a is arranged in the vicinity of the opening of the receiving portion 20. The locking member 660 used in this embodiment has substantially the same configuration as the locking member 660 of the fifth embodiment except for the fitting portion 660a to which the second plate portion 72'of the spacer 70'is fitted. ing.

Next, as shown in FIG. 23 (b), when the insertion portion 1a is inserted into the socket portion 20 by a predetermined distance and the push ring 403 is moved axially so as to be close to the socket portion 20, the spacer 70' The second plate portion 72'contacts the opening side end surface 20d of the receiving portion 20, and the movement of the locking member 660 in the receiving portion 20 direction is restricted accordingly. At this time, since the second plate portion 72'of the spacer 70'is fitted to the fitting portion 660a of the locking member 660, the movement of the locking member 660 in the receiving portion 20 direction is stably restricted. can.

Next, as shown in FIG. 24A, the push ring 403 is moved to the receiving portion 20 side by tightening the T-head bolt 80 and the nut 85. As a result, the first folder member 51 is peeled off from the first plate portion 71'of the spacer 70'and moves so as to press the packing holding body 13 and the packing 4'toward the receiving portion 20, and the taper of the push ring 403. The sliding of the surface 33e and the first tapered surface 62 of the locking member 660 causes the claw portions 61, 61, ... Of the locking member 660 to bite into the outer peripheral surface 1b of the insertion portion 1a.

Further, since the push ring 403 is provided with the notch groove 404 described above, the proximity movement between the push ring 403 and the receiving portion 20 is not hindered by the spacer 70'. As a result, the first folder member 51 is sandwiched between the push ring 403 and the opening side end surface 20d of the receiving portion 20, so that the sealing state between the insertion portion 1a and the receiving portion 20 by the packing 4'is maintained. Will be done.

Then, as shown in FIG. 24 (b), when an unexpected external force such as an earthquake acts in the direction in which the insertion portion 1a is separated from the receiving portion 20, the locking member 660 is further inserted by this external force. By further biting into the outer peripheral surface 1b of the portion 1a, a wedge effect and a tilting effect are exhibited, and the insertion tube 1 and the receiving tube 2 are prevented from being separated from each other.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions that do not deviate from the gist of the present invention are included in the present invention. Will be.

For example, one of the flow path constituent members of the present invention is not necessarily limited to a pipe as long as it is a member having a receiving portion and an insertion portion at an end portion and constitutes a flow path, for example, a valve body is provided inside. It may be a valve housing provided.

Further, for example, the push ring of the present embodiment is integrally formed, but the present invention is not limited to this, and a divided structure may be used.

1 Insertion pipe (the other flow path component)
1a Insertion part 2 Receiving pipe (one of the flow path constituent members)
3 Push ring (main body member)
4,4'Packing (seal member)
6,6'Locking member 7,7' collar (intermediate body)
10 Pipe fitting 11 Detachment prevention device 20 Receiving part 20d Opening side end face (end of receiving part)
30 Insertion hole (inner circumference of main body member)
30g groove (guide)
33e Tapered surface 51 First folder member (holding member)
56 Second folder member 61 Claw portion 62 First tapered surface 70, 70'Spacer (intermediate body)
250 Folder 251 First folder part (holding member)
256 Second folder part 303 Push ring (main body member)
310 Accommodating groove (inner circumference of main body member)
330e Tapered surface 351 Pressing member (holding member)
403 Push ring (main body member)
503 Push ring (main body member)
551 Presser member (holding member)
560 Locking member 660 Locking member

Claims (10)

An insertion portion of the other flow path constituent member is inserted into the socket portion of one flow path constituent member via a ring-shaped seal member, and is provided at a connection portion connected in a sealed manner. It is a detachment prevention device that prevents separation from each other.
By being housed in a main body member having an inner peripheral portion facing the outer peripheral surface and having an inner peripheral portion facing the outer peripheral surface, and being accommodated in the inner peripheral portion of the main body member, and pressed in the inner diameter direction by the main body member. At least a plurality of locking members locked to the outer peripheral surface of the insertion portion and a holding member provided between the locking member and the sealing member to hold the sealing member in a sealed state are provided.
An interposition body for restricting the axial entry of the locking member is formed between the locking member and the end of the receiving portion on the outer diameter side of the sealing member and the holding member. A detachment prevention device, wherein the interposition body has an end surface that comes into surface contact with the opening side end surface of the receiving portion. The detachment according to claim 1, wherein the end surface of the interposition body and the opening side end surface of the receiving portion are formed in a direction orthogonal to the axial direction of the flow path constituent member. Prevention device. The detachment prevention device according to claim 1 or 2, wherein the locking member and the holding member have tapered surfaces that are in surface contact with each other. The detachment according to any one of claims 1 to 3, wherein a second folder member constituting the folder unit is arranged together with the holding member on the opposite side of the holding member sandwiching the locking member. Prevention device. The detachment prevention device according to claim 4, wherein the locking member is held between the holding member and the second folder member in a state in which dropping is restricted. The detachment prevention device according to claim 5, wherein the locking member has a collar portion to be inserted into a notch portion formed in the holding member. 6. Described detachment prevention device. The detachment prevention device according to any one of claims 1 to 7, wherein a tapered surface for pressing the locking member in the inner diameter direction is formed on the main body member or the locking member. The detachment prevention device according to claim 8, wherein the main body member and the locking member are formed with a tapered surface that presses the locking member in the inner diameter direction by sliding with each other. The receiving pipe which is one of the flow path constituent members, the insertion pipe which is the other flow path constituent member, the seal member, and the detachment prevention device according to any one of claims 1 to 9. A pipe fitting characterized by having.

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