JP2023028137A - Detachment prevention device - Google Patents

Abstract

To provide a detachment prevention device capable of increasing strength against bending or twisting at a connection portion of a pair of divided bodies connected to each other.SOLUTION: A detachment prevention device 1 is composed of a plurality of divided bodies 1A, 1B, 1C divided in a circumferential direction. The divided bodies 1A, 1B, 1C comprise a base part 8 provided with a claw part 14 extending in the circumferential direction on an inner peripheral part, and connection parts 10L, 10R provided at both end parts of the base part 8 in the circumferential direction. The connection parts 10L, 10R extend from the base part 8 to a flange 2b of a socket part 2a, and are provided with a connection locking piece 10a at their ends.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnection prevention device that prevents a fluid pipe from coming off.

Conventionally, in a connection structure for inserting a spigot portion of one fluid pipe into a socket portion of the other fluid pipe, bolts and nuts are used to connect a press ring fitted to the spigot portion side and a flange on the socket portion side. A connection in which the socket part and the spigot part are connected in a sealed manner by a sealing material arranged along the circumferential direction between the peripheral surfaces of the socket part and the spigot part. structure is known. In such connection structures, it is known that a detachment prevention device is applied to prevent the receptacle portion and the spigot portion from coming off when an unexpected external force due to an earthquake or the like is applied.

For example, the detachment prevention device disclosed in Patent Document 1 is configured to be able to be externally fitted to the receptacle portion and the insert portion by annularly connecting a plurality of divided bodies divided in the circumferential direction. Each split body has a base portion fixedly arranged along the outer peripheral surface of the spigot portion, and a plurality of arm portions extending from the base portion in the pipe axial direction beyond the flange on the side of the socket portion. ing. The base is fixed to the receptacle by having a plurality of claws provided on the inner periphery thereof and protruding radially inwardly bite into the outer peripheral surface of the receptacle. Further, each arm is arranged so that a locking piece bent radially inwardly at its axial tip is locked to the flange on the side of the receptacle.

As a result, the detachment prevention device is a locking device extending from the base portion fixed to the insertion portion side by the claw portion when an external force acts to relatively move the insertion portion and the socket portion in the withdrawal direction. Since the piece can maintain a locked state in which it is locked to the end face of the flange, it is possible to prevent the insertion portion and the socket portion from coming off.

JP 2015-197191 (pages 4-6, Figure 4)

In such a detachment prevention device of Patent Document 1, flange-like connecting portions having a thickness in the circumferential direction are provided at both ends of each divided body in the circumferential direction, and the divided bodies facing each other in the circumferential direction are connected. Adjacent divided bodies can be annularly connected by connecting the connecting portions. However, when an external force acting in a bending direction or a twisting direction, in addition to an external force acting in the direction of escape in the pipe axial direction, acts in combination on the connection points of a pair of fluid pipes that are connected to each other, the fluid pipes will not be connected to each other. When forces in different directions are applied to the pair of divided bodies, each of the divided bodies individually exerts a function of preventing slipping out, but tries to tilt in a different direction with respect to the adjacent divided bodies. A local stress occurs at the connection point. As a result, there is a risk of damage due to concentrated load on the joints between the divided bodies and the fastening members that fasten the joints.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a detachment prevention device capable of increasing the strength against bending and twisting at the connecting portions of a pair of divided bodies connected to each other. aim.

In order to solve the above problems, the detachment prevention device of the present invention includes:
The socket portion of one fluid pipe and the spigot portion of the other fluid pipe are externally fitted to a connecting portion sealingly connected by a press ring fastened to the flange of the socket portion by a plurality of fastening members, A detachment prevention device that prevents these fluid pipes from coming off,
The detachment prevention device is composed of a plurality of divided bodies divided in the circumferential direction,
The divided body includes a base portion provided with claw portions extending in the circumferential direction on the inner peripheral portion, and connecting portions provided at both ends of the base portion in the circumferential direction,
The connecting portion is characterized in that it extends from the base portion to the flange of the receptacle portion, and is provided with a connecting locking piece at the tip.
According to this feature, for example, when an external force in a bending direction or a twisting direction acts in a complex manner on a connection point of a pair of fluid pipes connected to each other, each of the pair of connecting portions connected to each other are engaged with and cooperate with the flanges of the receptacle. As a result, bending and twisting are less likely to occur in the pair of connecting portions, so that the strength against bending and twisting of the connecting portions in the plurality of divided bodies can be increased.

The divided body further includes an arm portion extending from the base portion to the flange of the receptacle portion between the connecting portions provided at both ends in the circumferential direction of the base portion, and having a locking piece provided at the tip thereof. It is characterized by having
According to this feature, the detachment prevention function can be enhanced by further providing the arm portion having the locking piece at the tip along the circumferential direction of the flange.

An end face of the locking piece of the arm portion and an end face of the connecting locking piece of the connecting portion are formed substantially flush with an end face of the flange of the receptacle portion.
According to this feature, regardless of the relative movement direction or tilting direction of one fluid pipe and the other fluid pipe, at least one of the locking piece and the connecting locking piece is provided with the flange of the receptacle portion. This is effective because the relative movement and relative tilting can be restricted within a substantially constant range when the is locked.

The divided body is characterized in that the connecting locking pieces of the connecting portions at both ends in the circumferential direction are integrally continuous via the locking pieces of the arm portions.
According to this feature, since the locking piece of the arm portion and the connecting locking piece of the connecting portion are mutually supported, the locking piece of the arm portion and the connecting locking piece of the connecting portion can be reinforced.

The connecting portion and the arm portion have substantially the same height in a radial direction.
According to this feature, since the external shape of the arm portion and the connecting portion are similar, the connecting portion between the divided bodies is not conspicuous, and the appearance is good.

In the connected state of the plurality of divided bodies, the connecting portions and the arm portions that are connected to each other are evenly distributed in the circumferential direction.
According to this feature, the efficiency of distributing the force is good.

It is the perspective view which looked at the detachment prevention device in an Example from the insertion tube side. It is the perspective view which looked at the detachment prevention device from the socket pipe side. It is a side view of a partial cross section which shows a detachment prevention device. 4 is a view in the direction of arrow A in FIG. 3; FIG. It is a B direction arrow directional view in FIG. FIG. 5 is a sectional view taken along line CC in FIG. 4; It is a figure which shows the division body in FIG. FIG. 6 is a diagram of a divided body in FIG. 5; It is a D direction arrow directional view in FIG. 8 is a view in the direction of arrow E in FIG. 7; FIG. FIG. 8 is a view in the direction of arrow F in FIG. 7; It is the perspective view which looked at the connecting part which adjoins from the internal-diameter side. FIG. 4 is a side cross-sectional view showing a state in which an unexpected external force such as an earthquake acts on the socket pipe and the spigot pipe.

A mode for carrying out the detachment preventing device according to the present invention will be described below based on an embodiment.

A detachment prevention device according to an embodiment will be described with reference to FIGS. 1 to 13. FIG. In the following description, the right side of FIG. 3 is defined as the axially right side of the detachment preventing device, and the left side of the sheet is defined as the axially left side of the detachment preventing device.

As shown in FIGS. 1 to 3, the socket pipe 2, which is one fluid pipe, and the spigot pipe 3, which is the other fluid pipe, in this embodiment are, for example, for water supply buried in the ground. is made of ductile cast iron, and the inner peripheral surface of the pipe is coated with a mortar layer. In the lower half of FIG. 3, a cross section of a portion extending obliquely from the central axis with respect to the diametrical direction of the detachment prevention device 1 shown in FIG. 3 is illustrated.

Also, the fluid pipe according to the present invention may be made of metal such as cast iron or steel other than ductile, or may be made of concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin layer, plating, or the like, or the inner peripheral surface of the fluid pipe may be coated with a suitable material by powder coating. good.

In addition, in this embodiment, the fluid in the fluid pipe is not limited to tap water in this embodiment, but may be, for example, industrial water, agricultural water, sewage, or other liquids other than water, gas, or a mixture of gas and liquid. It may be a gas-liquid mixture.

As shown in FIG. 6, the socket pipe 2 has a socket-shaped socket 2a and a flange 2b provided at the end of the socket 2a. The spigot tube 3 has a spigot portion 3a that is inserted into the socket portion 2a.

In addition, the socket pipe 2 and the spigot pipe 3 are interposed between the inner peripheral surface 2c of the socket portion 2a and the outer peripheral surface 3b of the spigot pipe 3 through an annular sealing material 4 arranged over the entire circumference. is inserted. An annular push ring 5 formed by connecting arcuate members integrally or divided into a plurality of pieces is fitted on the outer peripheral surface 3b of the spigot tube 3. As shown in FIG. The push ring 5 has a pressing portion 5a projecting toward the flange 2b.

The push ring 5 is connected to the flange 2b by fastening a plurality of T-head bolts 6, 6, . . . and nuts 7, 7, . By bringing the press ring 5 and the flange 2b closer to each other along with this fastening, the seal material 4 pressed by the pressing portion 5a is in close contact with the inner peripheral surface 2c of the socket portion 2a and the outer peripheral surface 3b of the spigot portion 3a. Thus, the socket tube 2 and the insertion tube 3 are hermetically connected.

Further, as shown in FIG. 3, the pressing ring 5 is screwed by a bolt 5b inserted in the radial direction, and a pawl member (not shown) disposed on the inner peripheral portion of the pressing ring 5 engages the outer peripheral portion of the spigot tube 3. As shown in FIG. It is fixed to the insertion tube 3 by biting into the surface 3b. The claw members of the push ring 5 and the bolts 5b are arranged at 6 equal intervals in the circumferential direction, and one arm portion 9 or a pair of adjacent connecting portions 10L and 10R, which will be described later, are arranged on the outer diameter side thereof. .

As shown in FIGS. 3 to 6, the detachment prevention device 1, for example, as in the present embodiment, has a socket tube 2 and a spigot tube 3 that are sealingly connected via a press ring 5 and are pulled out in the tube axial direction. In order to prevent this, a plurality of divided bodies (in this embodiment, three divided bodies 1A, 1B, 1C) made of ductile cast iron are arranged in the circumferential direction and bolts and nuts 21, 21 (Fig. 4, Fig. 4 5) to form a ring. Although the detachment prevention device 1 of this embodiment is composed of three divided bodies 1A, 1B, and 1C, it may be formed in an annular shape by two divided bodies or four or more divided bodies.

Next, each divided body will be described with reference to FIGS. 3 to 8. FIG. Since the three divided bodies 1A, 1B, and 1C have the same shape and the same configuration, the divided body 1B will be described as an example. The divided body 1B includes an arc-shaped base portion 8 curved and extending in the circumferential direction, and an arm portion 9 ( 6), and a connecting portion 10L (see FIG. 3) and a connecting portion 10R (see FIG. 6) extending axially from both circumferential ends of the base portion 8 so as to straddle the flange 2b and the bolt 5b of the press ring 5. mainly composed of

Further, as shown in FIGS. 4 and 5, the arm portion 9 and the connecting portions 10L and 10R have their outer diameter ends arranged on substantially the same circumference, that is, their radial heights are substantially the same. Therefore, since the external shape of the arm portion 9 and the connecting portions 10L and 10R are similar, the connecting portions between the divided bodies 1A, 1B and 1C are not conspicuous and the appearance is good.

As shown in FIG. 5, the divided bodies 1A, 1B, 1C of this embodiment are arranged between the T-head bolts 6, 6, . . . and the nuts 7, 7, . In order to dispose the stop piece 9a or the connecting locking piece 10a, each divided body 1A, 1B, 1C has a base portion 8, one arm portion 9, and two connecting portions 10L, 10R each having substantially the same shape. Although it has the same shape, at least one of the plurality of divided bodies may have a different circumferential length of the base portion 8, and at least one divided body may have a different number of arm portions 9. good. That is, the shapes of the divided bodies 1A, 1B, and 1C may be individually changed as appropriate.

As shown in FIG. 7, two recesses 8a, 8a for inserting and fixing the pawl member 14 are arranged in the inner peripheral portion of the base portion 8 at a predetermined interval in the circumferential direction. Although not shown in particular, bolts may be screwed into the base portion 8 in the radial direction or inclined in the radial direction so as to communicate with the recesses 8a. By screwing the bolt from the recess 8a, a later-described claw member 14 accommodated in the recess 8a can be pushed inward.

More specifically, the recess 8a has a center in the circumferential direction that is substantially the same as the center in the circumferential direction between the arm portion 9 and the connecting portion 10L or the center in the circumferential direction between the arm portion 9 and the connecting portion 10R. It is configured to be placed in position. In addition, the end of the concave portion 8a arranged on the connecting portion 10L side in the circumferential direction on the connecting portion 10L side is arranged in the vicinity of the edge of the base portion 8 on the connecting portion 10L side in the circumferential direction. , the end on the side of the arm portion 9 is arranged near the center of the base portion 8 in the circumferential direction. Similarly, the end of the concave portion 8a arranged on the connecting portion 10R side in the circumferential direction on the connecting portion 10R side is arranged in the vicinity of the edge of the base portion 8 on the connecting portion 10R side in the circumferential direction. The end on the arm portion 9 side in the direction is arranged near the center of the base portion 8 in the circumferential direction. In other words, each concave portion 8a extends to near the center of the arm portion 9 in the circumferential direction and near the center of the circumferential direction of a pair of adjacent connecting portions 10L and 10R, which will be described later.

As shown in FIGS. 4, 6, and 11, the claw member 14 extends in an arc shape in the circumferential direction, and the locking claw 16 on the inner diameter side of the claw member 14 engages the outer peripheral surface 3b of the spigot tube 3 in the circumferential direction. It is for locking the detachment prevention device 1 to the spigot tube 3 by biting into substantially the entire circumference. The claw member 14 is made of a material harder than at least the surface of the spigot tube 3, such as ductile cast iron, steel, stainless steel, resin, or the like. In addition, the claw member 14 has elastic restoring force of elastic bodies 15, 15 such as rubber fitted between the fitting grooves 14a, 14a at both ends in the circumferential direction and the inner end portion in the circumferential direction of the concave portion 8a. are held so as not to fall off from the recessed portion 8a.

As shown in FIG. 9, the arm portion 9 extends from the base portion 8 in the direction of the pipe axis, and the distal end of the arm portion 9 is engaged with the flange 2b of the socket pipe 2 so that the arm portion 9 is positioned relative to the spigot pipe 3. It has a locking piece 9a for regulating withdrawal. More specifically, the arm portion 9 includes an inclined portion 9b that extends from the base portion 8 while being inclined to the outer diameter side, and an extended portion 9c that bends from the outer diameter side end of the inclined portion 9b and extends along the axial direction. and a locking piece 9a protruding in the radial direction substantially perpendicular to the tip of the extending portion 9c.

A pair of ribs 9d, 9d are formed on the outer side of the arm portion 9, extending from the outer diameter side end of the inclined portion 9b to the inner diameter edge of the extending portion 9c and the locking piece 9a. These ribs 9d, 9d are formed along both circumferential ends of the arm portion 9, thereby reducing the weight of the arm portion 9 and ensuring its structural strength.

Next, as shown in FIG. 7, the connecting portions 10L and 10R will be described by taking the divided body 1B as an example. The connecting portion 10L is arranged on the lower side of the drawing in FIG. 7, and the connecting portion 10R is arranged on the upper side of the drawing. Since these connecting portions 10L and 10R have substantially symmetrical shapes except for the configuration of a protruding portion 10h, which will be described later, unless otherwise specified, the connecting portion 10L will be described in the following description, and redundant description of the connecting portion 10R will be omitted. .

The connecting portion 10L has a connecting locking piece 10a that is locked to the flange 2b of the socket pipe 2 to restrict relative withdrawal from the insertion pipe 3, and is adjacent to the split body 1B. It is connected to the connecting portion 10R (hereinafter simply referred to as “adjacent connecting portion 10R”) in the other divided body 1C by means of bolts and nuts 21. As shown in FIG.

More specifically, as shown in FIGS. 9 and 10, the connecting portion 10L has an inclined portion 10b extending from the base portion 8 to the radially outer side and to the axially right side. An extension portion 10c that is bent and extends to the right in the axial direction, a connection locking piece 10a that protrudes in the inner diameter direction substantially orthogonal to the tip of the extension portion 10c, that is, the right end in the axial direction, and the base portion 8 in the axial direction. and a thin plate-like flange 10d extending leftward.

Through holes 10e and 10f are formed in the connecting portion 10L for fastening with bolts and nuts 21 and 21 (see FIG. 4). The through hole 10e penetrates the center of the inclined portion 10b in the width direction (substantially circumferential direction of the divided body 1B). The through hole 10f passes through the center of the flange 10d in the same direction as the through hole 10e. In this embodiment, the bolts of the bolt/nut 21 are illustrated as T-head bolts, but they may be hexagonal bolts and may be changed as appropriate.

As shown in FIGS. 6 and 7, the flange 10d of the connecting portion 10R protrudes outward in the circumferential direction of the divided body 1B at the axial left end of the circumferential outer surface facing the adjacent connecting portion 10L. A projecting portion 10h is formed.

Further, as shown in FIGS. 4 and 5, the extended portion 10c of the connecting portion 10L has a tapered surface extending in a direction away from the connecting portion 10R arranged opposite to the connecting portion 10R in the circumferential direction and inclined in the outer diameter direction. ribs 10La are formed. Similarly, the extending portion 10c of the connecting portion 10R is formed with a rib 10Ra having a tapered surface extending in a direction away from the opposing connecting portion 10L in the circumferential direction and inclined in the outer diameter direction.

Further, as shown in FIG. 5, a rib 10Lb protruding in the axial direction is formed on the connecting locking piece 10a of the connecting portion 10L at the circumferential end on the side opposite to the connecting portion 10R arranged to face the connecting portion 10L. ing. Similarly, the connecting locking piece 10a of the connecting portion 10R is formed with a rib 10Rb protruding in the axial direction at the end in the circumferential direction opposite to the connecting portion 10L arranged to face the connecting portion 10R.

These ribs 10La and 10Lb secure the structural strength while reducing the weight of the connecting portion 10L. Similarly, the ribs 10Ra and 10Rb secure the structural strength while reducing the weight of the connecting portion 10R.

Further, as shown in FIGS. 8 and 9, the connecting locking piece 10a of the connecting portions 10L and 10R is attached to the locking piece 9a of the arm portion 9 via the bridging portions 12, 12 that extend curvedly in the circumferential direction. continuous as one.

Next, the operation of assembling the detachment prevention device 1 will be described. As shown in FIGS. 3 to 6, the locking piece 9a of the arm portion 9 and the connecting locking pieces 10a of the connecting portions 10L and 10R are connected to the T-head bolts 6, 6, . The divided bodies 1A, 1B and 1C are arranged so as to abut on the axial right end face 2d of the flange 2b of the socket pipe 2 which avoids . Tighten at 21,21.

At this time, by tightening the bolts and nuts 21 and bringing the pair of adjacent connecting portions 10L and 10R close to each other, the divided bodies 1A, 1B and 1C move radially inward and the separation preventing device 1 contracts. diameter. As a result, each pawl member 14 is pressed against the outer peripheral surface 3b of the spigot tube 3 via the base 8, and the locking pawl 16 of the pawl member 14 bites into the outer peripheral surface 3b. 3 is fixed to the outer peripheral surface 3b.

Further, even when the fastening of the bolts and nuts 21, 21 is completed and the locking claws 16 of the claw members 14 are sufficiently biting into the outer peripheral surface 3b, the opposing surfaces of the pair of adjacent connecting portions 10L, 10R are still in contact with each other. are not in contact with each other, and a gap is formed between these facing surfaces. In other words, before the engaging claw 16 of the claw member 14 sufficiently bites into the outer peripheral surface 3b, the pair of adjacent connecting portions 10L and 10R can come into contact with each other to restrict the diameter reduction of the detachment prevention device 1. is prevented. Therefore, by fastening a pair of adjacent connecting portions 10L, 10R with bolts and nuts 21, 21, a pressing force is applied to the pawl member 14 to ensure that the locking pawl 16 bites into the outer peripheral surface 3b. be able to.

In addition, although the projecting portion 10h of the connecting portion 10R may come into contact with the circumferential outer surface of the adjacent connecting portion 10L, the retightening of the bolt/nut 21 inserted through the through hole 10e of the inclined portion 10b is possible. , the locking claw 16 of the claw member 14 can be bitten into the outer peripheral surface 3b.

In addition, when a pair of adjacent connecting portions 10L and 10R are connected, a groove is formed between the rib 10La of the connecting portion 10L and the rib Ra of the connecting portion 10R, and the rib 10Lb of the connecting portion 10L and the connecting portion A groove is also formed between the rib Rb of 10R. Since grooves are also formed between the pair of ribs 9d, 9d of the arm portion 9, the external shape of the pair of adjacent connecting portions 10L, 10R connected to the arm portion 9 is similar. , The connecting portions of the divided bodies 1A, 1B, and 1C are not conspicuous, and the appearance is good.

Next, a description will be given of a mode when an unexpected external force such as an earthquake is applied to the socket pipe 2 and the spigot pipe 3 to which the detachment prevention device 1 is fitted.

For example, when the socket tube 2 and the spigot tube 3 are about to be pulled out relative to each other along the respective axial directions, the locking piece 9a of the arm portion 9 and the connecting locking pieces of the connecting portions 10L and 10R The flange 2b of the socket pipe 2 is locked to 10a. At this time, since the base portion 8 is fixed to the outer peripheral surface 3b of the spigot tube 3 by the claw members 14, 14, .

In addition, the outer peripheral surface of the claw member 14 is an inclined surface 14b (see FIG. 3) having a larger diameter toward the socket pipe 2, and the tapered surface 8b (see FIG. 3) of the concave portion 8a inclined in the same direction. ) from the inside. Therefore, when the socket tube 2 and the spigot tube 3 are about to be pulled out relatively, the flange of the socket tube 2 is prevented from engaging the locking piece 9a of the arm 9 and the connecting locking piece 10a of the connecting parts 10L and 10R. 2b is locked. On the other hand, the pawl member 14 is driven along with the insertion tube 3 in the direction away from the socket tube 2 relative to other various members of the detachment prevention device 1 .

As a result, the inclined surfaces 14b of the claw members 14 located on both sides in the circumferential direction of the arm portion 9 are relatively axially left with respect to the tapered surface 8b of the recess 8a, that is, the side where the tapered surface 8b is reduced in diameter. , and the claw member 14 is pressed against the outer peripheral surface 3b of the spigot tube 3 by a wedge effect. can be enhanced.

Also, referring to FIG. 5, the connecting locking pieces 10a, 10a of the pair of adjacent connecting portions 10L, 10R are arranged between the pair of adjacent T-head bolts 6, 6 and nuts 7, 7. It is Further, referring to FIG. 12, on both sides in the circumferential direction of a pair of adjacent connecting portions 10L and 10R, a claw member 14 provided in the divided body 1B on the connecting portion 10L side and a divided body 1C on the connecting portion 10R side are provided. A pawl member 14 is provided.

As a result, the connecting locking pieces 10a, 10a of the pair of adjacent connecting portions 10L, 10R cooperate to engage the flange of the socket pipe 2 positioned between the pair of adjacent T-head bolts 6, 6. 2b. At this time, since the direction of the force received by the connecting locking pieces 10a, 10a from the flange 2b is substantially the same direction, the connecting locking pieces 10a, 10a are equivalent to the locking piece 9a of one arm portion 9. function. Therefore, the claw members 14 positioned on both sides of the connecting portions 10L and 10R in the circumferential direction are pressed against the outer peripheral surface 3b of the spigot tube 3 by the wedge effect. can be increased to increase the detachment prevention force.

Further, as shown in FIG. 12, the connecting locking pieces 10a, 10a of the pair of adjacent connecting portions 10L, 10R are locked to the flange 2b, and the claws provided on the divided body 1A on the side of the connecting portion 10L are engaged with each other. The member 14 and the claw member 14 provided on the divided body 1B on the connecting portion 10R side bite into the outer peripheral surface 3b of the spigot tube 3. As shown in FIG. Therefore, for example, when external forces in bending and twisting directions in addition to the external force in the removal direction act on the socket pipe 2 and the insertion pipe 3 in combination, the connecting portion 10L of the split body 1A and the split body 1B The claw member 14 provided cooperates in a cross-joint manner to exert a separation preventing force, or the connecting portion 10R of the divided body 1B and the claw member 14 provided in the divided body 1A cooperate in a cross-connected manner. It is possible to demonstrate the separation prevention force.

Further, as shown in FIG. 13, even if the socket tube 2 and the insertion tube 3 are tilted with respect to each other's axial center with the connection point as a base point, the locking piece 9a of the arm portion 9 and the adjacent The flange 2b of the socket pipe 2 is engaged with at least one of the connecting locking pieces 10a, 10a (adjacent connecting locking pieces 10a, 10a are one set) of each of the pair of connecting portions 10L, 10R. By being stopped, it is possible to prevent the socket tube 2 and the insertion tube 3 from coming off relative to each other.

Further, since the connecting locking piece 10a is integrally connected to the locking piece 9a through the bridging portion 12, the connecting portions 10L and 10R are supported not only by the base portion 8 but also by the arm portion 9. . That is, the structural strength of the connecting locking pieces 10a, 10a is reinforced. As a result, as shown in FIG. 13, the flange 2b is locked by the connecting locking pieces 10a, 10a of the pair of connecting portions 10L, 10R, which are adjacent in the circumferential direction. Even when the locking piece 9a of the arm portion 9 is separated from the flange 2b, that is, even when force is concentrated on the connecting locking pieces 10a, 10a of the connecting portions 10L, 10R, the flange 2b can be continuously supported. can.

Since the arm portions 9 are supported and reinforced by the connecting portions 10L and 10R, the flange 2b can be continuously supported even when force is concentrated on the locking piece 9a of one arm portion 9. can.

Further, the pressing force is dispersed by the cooperation of the connecting locking pieces 10a, 10a. Therefore, even if the widthwise dimension of the connecting portions 10L and 10R is shorter than the widthwise dimension of the arm portion 9, and the strength of each unit is relatively weaker than that of the arm portion 9, The flange 2b can be stably supported.

Further, as shown in FIGS. 4 and 5, the arm portion 9 and the connecting portions 10L and 10R are equally spaced in the circumferential direction, so that the locking piece 9a and the pair of adjacent connecting locking pieces 10a and 10a When the flange 2b is engaged with at least one of the members 10a, the force is efficiently distributed.

Further, the arm portion 9 and the connecting portions 10L and 10R are enhanced in structural strength by the rib 9d, the ribs 10La and 10Lb, and the ribs 10Ra and 10Rb. Since the portions 10L and 10R are similar in external shape, the locking piece 9a of the arm portion 9 and the connecting locking pieces 10a and 10a of the pair of connected adjacent connecting portions 10L and 10R are identical. Structural strength is uniform all around.

Further, as shown in FIG. 6, the connecting locking piece 10a of the connecting portions 10L and 10R has its axial left end face 10g facing the axial right end face 2d of the flange 2b of the socket pipe 2. It is arranged substantially flush with the axial left end surface 9e of the locking piece 9a of the arm portion 9 facing in the same direction as the axial left end surface 10g. As a result, at least one of the locking piece 9a and a pair of adjacent connecting locking pieces 10a, 10a can be operated regardless of the relative moving direction or tilting direction of the socket tube 2 and the insertion tube 3. When the flange 2b is locked to the flange 2b, relative movement and relative tilting can be restricted within a substantially constant range, which is effective.

Further, for example, in the case of connecting portions where connecting locking pieces are not formed as in the prior art, the flange 2b abuts on the locking pieces of the arms adjacent to these connecting portions. These locking pieces are spaced apart in the circumferential direction, and more specifically, are arranged between different pairs of bolts and nuts. Therefore, if the direction of the force received from the flange 2b via the locking piece differs between the adjacent split bodies, the split bodies tend to tilt in different directions. In other words, bending or twisting occurs at the connecting portion.

On the other hand, in the detachment prevention device 1 of this embodiment, the connecting locking pieces 10a, 10a of the pair of adjacent connecting portions 10L, 10R function in the same manner as one arm portion 9, so that the flange 2b Since the direction of the force received from the adjacent split bodies 1B and 1C is substantially the same, these split bodies 1B and 1C tend to tilt in the same direction together with the flange 2b. This prevents bending and twisting at the joint.

As described above, the detachment prevention device 1 of the present embodiment, for example, when an external force in a bending direction or a twisting direction acts on the joint between the socket pipe 2 and the insertion pipe 3 that are connected to each other, The connecting locking pieces 10a, 10a of the pair of adjacent connecting portions 10L, 10R connected to each other are locked to the flange 2b of the socket portion 2a and cooperate with each other. As a result, twisting is less likely to occur at the joints of the pair of joints 10L and 10R, so that the strength against bending and twisting at the joints of the plurality of divided bodies 1A, 1B, and 1C can be increased.

In each of the divided bodies 1A, 1B, and 1C, an arm portion 9 is arranged between the connecting portions 10L and 10R, more specifically, in the center of the base portion 8. The locking piece 9a of the arm portion 9 also has a socket Since the flange 2b of 2a can be locked, it can be locked along the circumferential direction of the flange 2b, for example, compared to a configuration in which the detachment prevention device 1 is assembled from split bodies having only the connecting portions 10L and 10R. Since the locking piece 9a and the connecting locking piece 10a can be arranged in a lockable manner, the separation prevention function can be enhanced.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

For example, in the above-described embodiment, the divided bodies 1A, 1B, and 1C are formed by ductile casting. There may be.

Also, although the divided bodies 1A, 1B, and 1C have been described as being integrally formed by casting, the present invention is not limited to this, and may be constructed by assembling a plurality of divided members.

In addition, although the divided bodies 1A, 1B, and 1C have been described as having the arm portion 9 and the connecting portions 10L and 10R, the structure is not limited to this, and the divided bodies 1A, 1B, and 1C do not have the arm portion 9 and only have the connecting portions 10L and 10R. Alternatively, it may have two or more arms 9 .

Further, although it has been described that the locking piece 9a or the pair of adjacent connecting locking pieces 10a, 10a are arranged between all of the pair of adjacent T-head bolts 6, 6, the present invention is not limited to this. The locking piece 9a and the adjacent pair of connecting locking pieces 10a, 10a may not be arranged in a part between the pair of T-head bolts 6,6. For example, there may be one or more positions where the locking piece 9a or a pair of adjacent connecting locking pieces 10a, 10a are arranged.

Further, although the detachment prevention device 1 has been described as having a configuration in which the arm portion 9 and the connecting portions 10L and 10R are evenly distributed in the circumferential direction, the arm portion 9 and the connecting locking pieces 10a and 10a are not limited to this. It does not have to be distributed. Further, even if the divided body does not have the arm portion 9 and has only the connecting and locking pieces 10a, 10a, the connecting and locking pieces 10a, 10a do not have to be evenly distributed.

Further, although the arm portion 9 and the connecting portions 10L and 10R have been described as straddling the bolt 5b of the pressing ring 5, this is not restrictive, and only one of the arm portion and the connecting portion may be the pressing ring. 5 bolt 5b may be straddled.

Further, although the push ring 5 has been described as having a configuration in which the pawl member is bitten into the spigot tube 3 by the bolt 5b and fixed, it is not limited to this, and is divided in the same manner as the detachment prevention device 1 of the above embodiment. A structure in which the claw member bites into the spigot tube 3 by connecting the push ring 5 and reducing the diameter thereof may be employed, or a structure in which the claw member and the bolt 5b are not provided may be employed.

1 detachment prevention device 1A, 1B, 1C divided body 2 socket pipe (one fluid pipe)
2a Socket 2b Flange 2d Axial right end face (end face of flange of socket)
3 spigot tube (other fluid tube)
3a spigot 5 push ring 6 T-head bolt (fastening member)
7 nut (fastening member)
8 Base 9 Arm 9a Locking piece 9b Inclined portion 9e Axial left end surface (end surface of locking piece)
10L, 10R connecting portion 10a connecting locking piece 10g axial left end face (end face of connecting locking piece)
12 bridging portion 14 pawl member 16 locking pawl

Claims (6)

The socket portion of one fluid pipe and the spigot portion of the other fluid pipe are externally fitted to a connecting portion sealingly connected by a press ring fastened to the flange of the socket portion by a plurality of fastening members, A detachment prevention device that prevents these fluid pipes from being pulled out,
The detachment prevention device is composed of a plurality of divided bodies divided in the circumferential direction,
The divided body includes a base portion provided with a claw portion extending in the circumferential direction on the inner peripheral portion, an arm portion extending from the base portion to a flange of the socket portion and having a locking piece provided at the tip thereof, and the base portion. connecting portions provided at both ends in the circumferential direction,
The detachment prevention device, wherein the connection portion extends from the base portion to a flange of the socket portion, and a connection locking piece is provided at a tip end thereof. The divided body further includes an arm portion extending from the base portion to the flange of the receptacle portion between the connecting portions provided at both ends in the circumferential direction of the base portion, and having a locking piece provided at the tip thereof. The detachment prevention device according to claim 1, characterized in that it has a 3. An end face of the locking piece of the arm portion and an end face of the connecting locking piece of the connecting portion are formed substantially flush with an end face of the flange of the receptacle portion. Detachment prevention device as described. 4. The detachment according to claim 2 or 3, characterized in that the connecting locking pieces of the connecting portions at both ends of the divided body in the circumferential direction are integrally continuous via the locking pieces of the arm portions. prevention device. 5. The detachment prevention device according to claim 2, wherein the connecting portion and the arm portion have substantially the same height in the radial direction. 6. The detachment prevention according to any one of claims 2 to 5, characterized in that, in the connected state of the plurality of divided bodies, the connecting portion and the arm portion that are connected to each other are equally distributed in the circumferential direction. Device.

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