JPH033835B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used for a joint portion consisting of a socket portion and an insertion portion of fluid pipes such as water pipes, gas pipes, and plant piping. The present invention relates to a device for preventing detachment, and more particularly, to a detachment preventing device that uses a locking piece of an elongated body interposed therein and using the locking piece biting into the surface of the insertion port.

[Prior Art] The present applicant previously disclosed in Utility Application No. 135146/1983 (hereinafter referred to as "prior art") that "one of the fluid pipes to be connected is connected within the socket at the end of the other fluid pipe. At the joint part of the fluid pipe where the insertion part at the end of the fluid pipe is inserted and connected watertight via packing, the inner surface of the detachment prevention fitting that engages with the socket part or the socket part itself. An inner circumferential groove is formed on the inner surface in the circumferential direction opposite to the insertion part, and a locking member (locking ring) is formed in the inner circumferential groove that has a disc spring action and a biting edge is formed on the inner surface. Alternatively, a split locking piece) is housed in an inclined state, and the locking member is pressed and restrained from the outside by a push bolt screwed into a screw hole communicating with the inner circumferential groove, so that the locking member bites. "A device for preventing separation of fluid pipes, characterized in that the device is secured to the outer circumferential surface of the insertion port by a blade."

According to this prior art device, when the socket part receives a force in the direction of detachment from the socket part, the front and rear surfaces of the locking member are restrained by the inner circumferential groove, and the outer surface is restrained by the push bolts. As a result, torsional deformation occurs due to the action of the disc spring, and the biting blade bites deeper and evenly into the surface of the socket, reliably preventing the socket from coming off. In addition, since the locking member exhibits disc spring characteristics and has flexibility, it can absorb vibrations caused by pulsating liquid flow or the like.

However, in this prior art, since the push bolt stands upright and abuts against the outer surface of the locking member, only the tightening torque caused by the threaded rotation of the push bolt is transmitted to the locking member. As a result, the initial tightening torque required to cause the cutting edge of the locking member to bite into the hard surface of the insertion port is insufficient. Therefore, if the push bolt is strongly tightened, the bolt will be damaged. Additionally, countermeasures such as increasing the number of push bolts can be taken, but the effort of drilling a screw hole in the detachment prevention fitting cannot be avoided.

Furthermore, the bottom surface of the push bolt and the outer surface of the locking member are forced to make point contact, and it is necessary to make accurate contact between the two, making the tightening operation of the push bolt time-consuming.

[Technical Problems of the Present Invention] In view of the above-mentioned circumstances, an object of the present invention is to obtain a novel tightening means that can sufficiently and variably secure the initial biting force for the insertion portion of the locking member (technical problem). subject).

[Configuration of the present invention] The fluid pipe detachment prevention device of the present invention has the following configuration (technical means). That is, in the joint part of the fluid pipe which is connected watertightly through packing, the insertion part of the end of the other fluid pipe to be connected is inserted into the socket part of the end of one fluid pipe to be connected. , an inner circumferential groove is formed in the inner circumferential direction of the detachment prevention fitting that engages with the receptacle in a circumferential direction opposite to the receptacle, and the inner circumferential groove has a disc spring action and bites into the inner surface. An annular or arc-shaped locking member having a blade formed thereon is accommodated in an inclined state, and an inclined surface on the inner surface of a bolt head of a horizontal push bolt inserted into a bolt insertion hole that communicates horizontally with the inner circumferential groove. The locking member is press-retained from the outside and is locked to the outer circumferential surface of the insertion port by a biting blade of the locking member.

In the above configuration, the inner circumferential groove may be continuous or discontinuous.

With this configuration, when the detachment prevention device is attached to the joint, when the horizontal push bolt is tightened, the inclined surface on the inner surface of the bolt head comes into contact with the outer surface of the locking member, and the angle of the locking member is adjusted to match the angle of the inclined surface. The locking member is pressed by the pressing force. In other words, if the angle of the slope is 30°, the angle will be approximately 1.7 times larger than that of 45°.
If it is 20 degrees, it will be amplified twice.

In addition, when the insertion part receives a force in the direction of detachment from the socket, the front and rear surfaces of the locking member are restrained by the inner circumferential groove, and the outer surface is restrained by the horizontal push bolt, so that the locking member is restrained by the action of the disc spring. It undergoes torsional deformation, and the biting blade at its tip bites evenly and deeply into the surface of the socket, reliably preventing the socket from coming off.

[Effects of the present invention] Since the present invention has the above configuration, it has the following unique effects.

The locking member is strongly tightened due to the taper effect of the inclined surface of the lower surface of the head of the horizontal push bolt, and the tightening torque of the horizontal push bolt is small, so that the tightening work for the locking member is efficiently performed. be able to.

Since the outer surface of the locking member is in contact with the entire slope of the lower surface of the head of the horizontal push bolt, there is a wide tolerance for misalignment of the locking member, and the tightening work is easy.

[Example] Hereinafter, an example of the fluid pipe detachment prevention device of the present invention will be described based on the drawings.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to a so-called socket type joint.

Reference numerals 1 and 2 are sockets and inlets for the connecting tubes H and I. The socket part 1 has a collar 1 at its outer end.
a, and has a packing accommodation recess 1 on its inner peripheral surface.
b is formed. 2a is a chamfered end surface portion of the insertion port 2.

Reference numeral 3 denotes a packing inserted into the packing receiving recess 1b of the socket 1. The packing 3 has a self-sealing effect.

Reference numeral 5 denotes a detachment prevention fitting fitted into the insertion opening 2, which is formed into two parts 5A and 5B in this embodiment. A flange 6 is formed at both ends of each of the two halves 5A, 5B, and a bolt insertion hole 6a is bored in the flange 6.
A fixing bolt 7 (consisting of a bolt 7a and a nut 7b) is inserted through the metal fitting 5 to integrally assemble the metal fitting 5.

An eaves portion 8 is integrally formed to protrude from the front surface of the metal fitting 5, and the bent portion 8a thereof is engaged with the collar 1a of the socket portion 1 to fix the metal fitting 5.

Reference numeral 10 denotes a sectioned inner circumferential groove (hereinafter simply referred to as "inner circumferential groove") formed by dividing the inner periphery of the main body of the metal fitting 5 with a partition wall 11, and the locking piece to be described later is in its natural state. (i.e. in an inclined state).

Reference numeral 13 denotes bolt insertion holes for horizontal push bolts, which will be described later, which are bored at multiple locations around the circumference of the main body of the metal fitting 5. The bolt insertion hole 13 is connected to the metal fitting 5
The tube is bored in the main body portion thereof in the tube axis direction, that is, in the horizontal direction, so as to communicate with the inner circumferential groove 10.

Reference numeral 15 denotes a locking piece as a locking member, which is accommodated in the inner circumferential groove 10 of the metal fitting 5. The locking piece 15 is made of metal such as ductile cast iron or steel that is commonly used in the technical field, but other materials (hard synthetic resin, such as polyacetal as engineering plastic, polycarbonate, etc.) may be used. This does not preclude the use of.

The locking piece 15 has a substantially disk spring-like cross section;
It has highly elastic properties overall. In this embodiment, the locking piece 15 has a quarter-arc shape, and its cross section is such that the outer surface 15a is arc-shaped, the inner surface 15b is a biting blade, and the front surface 15c and rear surface 15d are parallel to each other. (See Figure 3 a and b). When the strength of the locking piece 15 is insufficient, the locking piece 15 may be attached to the front surface 1 as appropriate.
5c, and the rear surface 15d is overlaid to enlarge the cross section (see Fig. 3c).

Support members 16 made of hard rubber are interposed between both ends of the locking piece 15 and the partition wall 11 to hold the locking piece 15 in the inner circumferential groove 10. The support member 16 may be made of a hard rubber material or other suitable material such as a spring member.

Therefore, the locking piece 15 is accommodated in the inner circumferential groove 10 with the support member 16 at the factory (manufacturing site) prior to joining the pipes, and thus does not fall off during transportation.

Incidentally, to illustrate the specifications of the locking piece 15, the nominal diameter
The thickness t of the locking piece 15 (front surface 15c and rear surface 15
d) is 10 mm, and the height h (distance between the apex of the outer surface 15a and the tip of the inner surface 15b) is 20 mm.
The inclination angle α (the angle formed by the rear surface 15d with the plane perpendicular to the tube axis) in the natural state is 13°.

17 is a horizontal push bolt, and the bolt head 18
It consists of a bolt rod 18 and a nut 19. The inner surface 18b of the bolt head is formed into an inclined surface (20° in this embodiment) (see FIG. 4).

The horizontal push bolt 17 is inserted into the bolt insertion hole 13 of the metal fitting 5, and the inner surface 18b of the bolt head presses the locking piece 15 from the outside in the circumferential direction toward the radial direction (in the direction of the center of the tube axis). .

In this embodiment, the horizontal push bolt 17 is located at a symmetrical position relative to the center of each locking piece.
Adopt a mode of pressing the area. According to this aspect, the cutting edge portion 15b of the locking piece bites into the surface of the insertion port as evenly as possible.

The procedure for attaching the detachment prevention device of this embodiment and the effect upon detachment are as follows.

(1) Attach the packing 3 to the socket 1 of the fluid pipe H, and insert the socket 2 of the other fluid pipe I while maintaining centering.

(2) Engage the bent portions 8a of the eaves portions 8 of the two halves 5A and 5B of the detachment prevention fittings 5 incorporating the locking pieces 15 and the horizontal push bolts 17 to the collar 1a of the socket portion 1. At the same time, the flanges 6 are brought into contact with each other and the metal fittings 5 are assembled into one piece using the fixing bolts 7.

(3) By tightening the nut 19 of the horizontal push bolt 17, the bolt rod 18 is drawn, and the outer surface 15a of the locking piece 15 is pressed with the inclined surface 18b of the inner surface of the head 18a. In this embodiment, the inclined surface 18
b has a gentle slope of 20 degrees, and its tapered action amplifies the tightening torque of the nut 19 and pushes the locking piece 15 inward. Since the locking piece 15 has a disc spring-like cross section and takes an inclined position, the rear surface 15d collides with the rear surface of the inner circumferential groove 10 due to the pressure of the horizontal push bolt 17, and the biting edge 15b at the tip is inserted into the insertion hole. It locks into the outer surface of the portion 2 in a biting manner (see Fig. 5a). 4 fluid pipes H and I move relative to each other (see Figure 5b), and the insertion part 2 connects to the socket part 1.
When the locking piece 15 is displaced in the direction away from (A direction), the outer surface 15a and the rear surface 15d are restrained by the horizontal push bolt 17 and the inner circumferential groove 10, so that the outer surface 15a and the horizontal push bolt 1
Rotates in the torsional direction (direction B) by exerting a disc spring action around the point of contact with the inclined surface 18b of
The biting blade 15b at the tip bites evenly and more deeply in the circumferential direction at the same position on the surface of the insertion port 2. Locking piece 15
Since the rear surface 15d of the locking piece 15 collides with the inner circumferential groove, the rotation of the locking piece 15 stops with a slight rotational displacement. As a result, removal of the insertion port 2 is reliably prevented.

6 and 7 show other embodiments of the invention.

This embodiment is applied to a so-called mechanical joint, and has the same structure as the previous embodiment except for the aspects of the detachment prevention fitting, that is, the push ring, the inner circumferential groove, and the locking means.

Here, reference numerals 21 and 22 are sockets and insertion ports for the pipes J and K to be connected, 21a is a collar of the socket 21, 21b is a packing accommodating recess, and 21c is a bolt insertion hole. 23 is Packing.

Reference numeral 25 denotes a detachment prevention fitting, so-called push ring, which is fitted into the socket 22; 25a is a bolt insertion hole;
5b is a protrusion that presses the packing 23.

Reference numeral 30 denotes an inner circumferential groove continuously formed on the inner circumference of the main body portion of the press ring 25. 33 is a bolt insertion hole for a horizontal push bolt.

A locking ring 35 is a locking member consisting of a plurality of divided locking pieces, and is accommodated in the inner circumferential groove 30 of the press ring 25. Reference numeral 36 denotes a spacing member, which is made of hard rubber (spring material is also acceptable),
The function is to connect each divided locking piece to form a ring.

37 is a horizontal push bolt. 38 is the bolt rod, 38a is the bolt head, 38b is the inclined surface, and 39 is the nut.

40 is a fastener, which includes a bolt 41 and a nut 4;
Consists of 2. The bolt rod 41a is inserted into the push ring 25 and the bolt insertion holes 25a, 21c of the collar 21a of the socket part 21.
By inserting the bolt head 41b into the flange 21a and rotating the nut 42, the push ring 25 is drawn toward the socket 21.

[Brief explanation of the drawing]

The drawings show an embodiment of the fluid pipe detachment prevention device of the present invention, FIG. 1 is a partially sectional side view of one embodiment, FIG. 2 is a partially sectional front view thereof, and FIG. 3a is a locking device. FIG. 4 is a side view of one embodiment of the piece, FIG. Figures 5a and 5b are operational views of the locking piece, Figure 6 is a partially sectional side view of another embodiment (cross-sectional view taken along line B-B in Figure 7), and Figure 7 is a sectional front view thereof. . 1, 21... Socket part, 2, 22... Socket part,
3, 23... Packing, 5, 25... Separation prevention fitting (push ring), 10, 30... Inner circumferential groove, 13, 3
3... Bolt insertion hole, 15, 35... Locking member,
17, 37...Horizontal push bolt.

Claims (1)

[Scope of Claims] 1. The insertion port 2 at the end of the other fluid pipe to be connected is inserted into the socket 1 at the end of the other fluid pipe to be connected, and the fluid pipe is sealed watertight through the packing 3. At the joint part of the fluid pipe to be connected, on the inner surface of the detachment prevention fitting 5 that engages with the socket part 1,
An inner circumferential groove 10 is formed in the circumferential direction facing the insertion port 2, and within the inner circumferential groove 10 is an annular or arcuate engagement having a disc spring action and having a biting edge 15b formed on the inner surface. The locking member 15 is accommodated in an inclined state, and the locking member is held in place by the inclined surface 18b on the inner surface of the bolt head 18a of the horizontal push bolt 17 inserted into the bolt insertion hole 13 horizontally communicating with the inner circumferential groove 10. 15 from the outside to press and restrain the locking member 1.
A device for preventing detachment of a fluid pipe, characterized in that the device is configured to be locked to the outer circumferential surface of the insertion port 2 by a biting blade 15b of No. 5.