JP5914029B2 - Detachment prevention device - Google Patents

Description

  The present invention relates to a detachment prevention main body having a recessed portion that is fitted on the outer peripheral surface of the fluid pipe and that extends in the circumferential direction on the inner peripheral surface, and is housed in each of the recessed portions. A fluid pipe comprising: a plurality of arcuate claws having a blade portion that can bite into the outer peripheral surface; and a pressing means for biting the blade portion into the outer peripheral surface of the fluid pipe by pressing an outer peripheral end of the arcuate claw. The present invention relates to a separation prevention device.

  As a conventional detachment prevention device attached to a joint portion between fluid pipes such as water pipes and gas pipes, for example, plate-like retaining members are juxtaposed in the pipe axis direction, and the retaining members are moved by relative movement of the fluid pipes. A separation prevention device that changes the posture to a biting state is known (see, for example, Patent Document 1).

  Further, in order to improve the separation prevention effect and prevent damage to the anticorrosion layer on the inner peripheral surface of the fluid pipe, two claw portions of the retaining member are formed in the pipe axis direction, and further adjacent to the pipe circumferential direction. What arrange | positions so that the nail | claw part of a retaining member may mutually overlap in a pipe-axis direction is shown (for example, refer patent document 2).

Japanese Patent No. 3558617 (5th page, Fig. 1) JP 2010-71472 A (6th page, FIG. 4)

  However, in the separation preventing device disclosed in Patent Document 1, since the retaining member is changed into the biting state by the relative movement between the two fluid pipes, the outer peripheral surface of the fluid pipe moves the claw portion. Could cause damage. Further, in the separation preventing device disclosed in Patent Document 2, since the two claw portions of the retaining member are formed in the axial direction of the fluid pipe, there is a possibility that the separation preventing force is insufficient.

  The present invention has been made to solve such problems of the prior art, and not only doubles the detachment prevention force of the fluid pipe, but also provides an anticorrosion layer formed on the outer peripheral surface and inner peripheral surface of the fluid pipe. It is an object of the present invention to provide a separation preventing device that can suppress the occurrence of cracking and peeling.

In order to solve the above-mentioned problem, the separation preventing device of the present invention is
A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
A plurality of blade portions of each of the arcuate claws are provided apart from each other in the tube axis direction of the fluid pipe, and a plurality of the arcuate claws are arranged to be displaced in the axial direction of the fluid pipe and are shifted in the circumferential direction. It is characterized by the arrangement.
According to this feature, a large number of blade portions are arranged in the axial direction of the fluid pipe, and a plurality of arcuate claws are arranged in the axial direction of the fluid pipe, and are arranged in the circumferential direction. In addition to doubling the fluid pipe disengagement prevention force, the biting force when the blade portion of the arcuate claw bites is applied over a wide range in the direction of the outer peripheral surface of the fluid tube, and is distributed to many blade portions. Moreover, it can suppress that a crack and peeling generate | occur | produce in the anticorrosion layer formed in the outer peripheral surface and inner peripheral surface of a fluid pipe | tube. Even if the fluid pipe is bent and deformed, a plurality of arcuate claws are arranged in the axial direction of the fluid pipe, so that the blade portion of the arcuate claw bites into the outer peripheral surface of the fluid pipe along the bending deformation of the fluid pipe. Can be reliably prevented. Furthermore, by arranging a plurality of arcuate claws offset in the circumferential direction in the axial direction, the perimeter of each arcuate claw can be kept short with the blade portion locked over substantially the entire circumference of the fluid pipe. Therefore, the pressing means can apply a pressing force strongly and evenly over the entire arcuate claw.

The separation preventing device of the present invention is
The at least one arcuate claw of the plurality of arcuate claws is characterized in that a tongue piece that engages with the outer peripheral surface of another arcuate claw is formed.
According to this feature, when one of the plurality of arcuate claws is pressed by the pressing means, the pressing force is transmitted to the outer peripheral surface of the other arcuate claw via the tongue piece, and the blade portion is transferred to the outer peripheral surface of the fluid pipe. Therefore, the number of pressing means such as push bolts can be reduced, and the structure of the separation preventing main body can be simplified. Moreover, the man-hour at the time of mounting | wearing and mounting | wearing with a separation | elimination prevention apparatus to a fluid pipe | tube can be reduced.

The separation preventing device of the present invention is
An inner wall extending in the circumferential direction for separating the inside of the concave portion in the axial direction of the fluid pipe is formed in the concave portion formed on the inner peripheral surface of the separation preventing main body.
According to this feature, since the recesses are separated by the inner wall, the arrangement position of each arcuate claw within the recess can be accurately regulated, and the cutting force of the blade part is exerted by preventing the deviation of the arcuate claw. can do.

The separation preventing device of the present invention is
The recess formed in the inner peripheral surface of the detachment prevention main body includes a circumferentially extending inner wall for separating the inside of the recess in the axial direction of the fluid pipe, and at least one arcuate claw of the plurality of arcuate claws. the tongue engages the outer peripheral surface of the other arcuate pawl, and the predetermined position before Symbol inner wall, and wherein an opening of said tongue of said arcuate pawl penetrates is formed.
According to this feature, when the arcuate claw is arranged in the recess, the tongue piece of the arcuate claw can be arranged through the opening of the inner wall, so that the positioning of the arcuate claw can be performed accurately and easily.

The separation preventing device of the present invention is
A fall prevention body is provided in the opening of the inner wall through which the tongue piece of the arcuate claw penetrates.
According to this feature, when the arcuate claw provided with the tongue piece is attached to the opening portion of the inner peripheral wall, the tongue piece is sandwiched and locked by the fall prevention body provided at the opening portion. It is possible to regulate, and the work of attaching the arcuate claw to the recess can be facilitated.

The separation preventing device of the present invention is
The other arcuate claw with which the tongue piece of the one arcuate claw is engaged is formed with a fall prevention structure portion for locking to the tongue piece.
According to this feature, the other arcuate claw is locked to the single arcuate claw with the tongue piece by the fall prevention structure part, so that both the arcuate claws can be integrated into the recess and the assembling work is easy. Can be.

The separation preventing device of the present invention is
An anticorrosion member is provided on the surface of the blade portion of the arcuate claw.
According to this feature, since the surface of the blade portion of the arcuate claw is covered with the anticorrosive member, corrosion of the blade portion and the outer surface of the fluid pipe can be prevented, and the separation preventing effect can be maintained for a long time. it can.

It is a sectional side view which shows the separation prevention apparatus in Example 1. FIG. It is a partially broken front view which shows the separation prevention apparatus in Example 1. FIG. (A) is HH sectional drawing in FIG. 2, (b) is JJ sectional drawing similarly. (A) is a front view which shows the 1st arcuate nail | claw in Example 1, (b) is a front view which similarly shows a 2nd arcuate claw. (A) is KK sectional drawing in FIG.3 (b), and is a figure which shows the relationship between the inner wall of a detachment | desorption prevention apparatus, the cross section of a tongue piece, and a fall prevention body (rubber for fall prevention). (B) is LL sectional drawing in FIG.3 (b), and is a figure which shows the relationship between the fall prevention structure part of a 2nd arcuate nail | claw, and the tongue piece of a 1st arcuate nail | claw. It is a sectional side view which shows the separation prevention main body in Example 2. FIG. FIG. 6 is a side cross-sectional view showing a detachment prevention main body in Example 3. FIG. 10 is a side cross-sectional view showing a detachment prevention main body in Example 4. (A) is a principal part enlarged view which shows the detachment | leave prevention main body in Example 5, (b) is a sectional side view similarly.

  EMBODIMENT OF THE INVENTION The form for implementing the separation prevention apparatus which concerns on this invention is demonstrated below based on an Example.

  A detachment preventing apparatus according to Embodiment 1 will be described with reference to FIGS. Hereinafter, the left side of FIG. 1 will be described as an upstream side where fluid flows.

  As shown in FIG. 1 to FIG. 3, the insertion tube 1 and the receiving tube 2 that are fluid tubes in this embodiment are, for example, ductile cast iron, other cast iron, steel for waterworks buried in the ground, It is a fluid pipe made of vinyl chloride, polyethylene, polyolefin, or the like, and an end portion on the tube axis direction side of the receiving tube 2 is formed with a receiving portion 2a having a diameter larger than that of other portions of the receiving tube 2. In addition, an insertion portion 1a that can be inserted into the receiving portion 2a is formed at the end of the insertion tube 1 on the tube axis direction side. Moreover, it has the flange 2b extended in the outer-diameter direction at the edge part of the receptacle part 2a. When the insertion tube 1 and the reception tube 2 are metal fluid tubes, the inner peripheral surfaces of the insertion tube 1 and the reception tube 2 are separated from the fluid flowing in the insertion tube 1 and the reception tube 2. As an anticorrosion treatment for preventing corrosion, an anticorrosion layer (not shown) is formed by mortar, anticorrosion paint, powder resin coating or the like. An anticorrosion layer (not shown) is formed on the outer peripheral surfaces of the insertion tube 1 and the receiving tube 2 by anticorrosion paint, powder resin coating or the like. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

  The insertion tube 1 and the receiving tube 2 are connected by inserting the insertion portion 1a into the receiving portion 2a, and the insertion tube 1 and the receiving tube 2 are inserted into the gap between the insertion portion 1a and the receiving portion 2a. An annular sealing member 9 that seals the mouth tube 2 in a sealing manner is interposed, and a part of the sealing member 9 on the side of the inlet tube 1 is exposed to the outside. The insertion tube 1 and the receiving tube 2 connected in this way are provided with a detachment prevention device 3 of the present invention for preventing such detachment.

  As shown in FIGS. 1 to 4, the detachment prevention device 3 includes a press ring 5 which is a detachment prevention body of the present invention having a recess 4 extending in the circumferential direction on the inner peripheral surface, and a first arcuate claw in each recess 4. 6A and a second arcuate claw 6B are accommodated, and a pressing bolt 7 which is a pressing means of the present invention that presses the outer peripheral end of the first arcuate claw 6A is provided.

  First, the push wheel 5 will be described. As shown in FIGS. 1 to 3, the pusher wheel 5 is slightly larger in diameter than the outer peripheral surface of the insertion tube 1 and is arranged in an annular shape, and the outer peripheral surface of the pusher wheel 5 penetrates toward the flange 2 b. A plurality of holes 28 are formed at predetermined intervals in the circumferential direction, and a connection bolt (not shown) is inserted into each through hole 28 and connected to the flange 2b. In addition, a plurality of arc-shaped concave portions 4 and 4 that are continuous in the circumferential direction are provided on the inner peripheral surface of the press wheel 5 so as to form a substantially concave shape in cross-sectional view that opens in the inner diameter direction, and are spaced apart in the axial direction. Has been placed. Further, the inner peripheral surface 4a of the concave portion 4 is formed in a tapered shape whose diameter is expanded toward the receiving pipe 2, and the tapered inner peripheral surface 4a penetrates perpendicularly to the inner peripheral surface 4a. In other words, screw holes 10 that are inclined with respect to the tube axis are formed.

  Further, the pusher wheel 5 is provided with a projecting portion 8 projecting in an annular shape toward the sealing member 9, and the sealing member 9 is locked to the projecting portion 8, thereby maintaining a sealed connection state. doing. In addition, although this push ring is provided in the outer peripheral surface of the insertion tube in the shape of an integral ring in the entire circumferential direction, it may be formed in a ring shape by being divided into a plurality of pieces and connected.

  Next, the first arcuate claw 6A and the second arcuate claw 6B housed in the recesses 4 and 4 will be described. As shown in FIGS. 1 and 4, the first arcuate claw 6A has an outer peripheral surface 6Aa, and at least an outer peripheral surface pressed by a bolt 7 as a pressing means is formed on a tapered surface 6Ac. The first arcuate claw 6A is formed with a plurality of blade portions 6Ab spaced in the axial direction of the fluid pipe in the inner diameter direction. The first arcuate claw 6A has a substantially rectangular shape in plan view, and has a substantially convex shape in front view. The second arcuate claw 6B also has an outer peripheral surface 6Ba and has a substantially rectangular shape in plan view. Similarly to the first arcuate claw 6A, a plurality of blade portions 6Bb are formed apart from each other in the axial direction of the fluid pipe in the inner diameter direction. Further, the first arcuate claw 6A and the second arcuate claw 6B are arranged so as to be shifted from each other in the circumferential direction. This not only doubles the separation prevention force of the fluid pipe, but also the biting force when the blade part of the arcuate claw bites is applied over a wide range in the direction of the outer peripheral surface of the fluid pipe and is distributed to a large number of blade parts. Therefore, it can suppress that a crack and peeling generate | occur | produce in the anticorrosion layer formed in the outer peripheral surface and inner peripheral surface of a fluid pipe | tube.

  Further, as shown in FIG. 3B, the first arcuate claw 6A is formed with a tongue piece 6Ad that engages with the outer peripheral surface 6Ba of the second arcuate claw 6B. A tapered surface 6Bc is formed on the outer peripheral surface 6Ba of the second arcuate claw 6B with which the inner surface 6Adc of the tongue piece 6Ad is engaged. More specifically, as shown in FIGS. 4A and 4B, the tongue 6Ad of the first arcuate claw 6A is provided from one end in the circumferential direction of the first arcuate claw 6A, and the second arcuate claw The tapered surface 6Bc of 6B is provided at the approximate center in the circumferential direction of the second arcuate claw 6B. Then, as shown in FIG. 3 (a), the first arcuate claw 6A and the second arcuate claw 6B are accommodated in the recess 4, and the pressing bolt 7 as the pressing means is inserted into the screw hole 10 of the presser wheel 5 as the separation preventing body. When it is screwed, the taper surface 6Ac of the first arcuate claw 6A is pressed, and as shown in FIG. 3B, the pressing force is applied to the second arcuate claw via the tongue piece 6Ad of the first arcuate claw 6A. In addition to 6B, the blade portion 6Bb of the second arcuate claw 6B together with the blade portion 6Ab of the first arcuate claw 6A acts to bite into the outer peripheral surface of the insertion tube 1.

  In this way, a large number of blades 6Ab, 6Bb are arranged in the axial direction of the fluid pipe, and a plurality of arcuate claws 6A, 6B are arranged in the axial direction of the fluid pipe, and they are shifted from each other in the circumferential direction. Since it is arranged, not only the force of preventing the fluid pipe from detaching is doubled, but also the biting force when the blades 6Ab, 6Ab and 6Bb, 6Bb of the arcuate claws 6A, 6B bite into the outer peripheral surface of the fluid pipe is large. Since the biting force when the blade portions 6Ab, 6Ab and 6Bb, 6Bb of the arcuate claws 6A, 6B bite is applied over a wide range in the outer peripheral surface direction of the fluid tube, It can suppress that a crack and peeling generate | occur | produce in the anticorrosion layer formed in the outer peripheral surface or the inner peripheral surface. Even if the insertion tube 1 is bent and deformed, the first arcuate claw 6A and the second arcuate claw 6B are arranged in a plurality of rows in the axial direction of the insertion tube 1, so that the insertion tube 1 is bent and deformed. Thus, the blade portions 6Ab, 6Ab and 6Bb, 6Bb of the arcuate claws 6A, 6B can bite into the outer peripheral surface of the insertion tube 1, and even if the insertion tube 1 is bent, it can be surely prevented from being detached. Furthermore, by arranging the plurality of arcuate claws 6A, 6B in the axial direction so as to be shifted in the circumferential direction, the blade portions 6Ab, 6Ab and 6Bb, 6Bb are locked over substantially the entire circumference of the insertion tube 1. Since the perimeter of each of the arcuate claws 6A and 6B can be kept short, a pressing bolt 7 as a pressing means can apply a strong and even pressing force to the entire arcuate claws 6A and 6B.

  The blade portions 6Ab, 6Ab, and 6Bb, 6Bb are arranged in two strips spaced substantially parallel to each other at equal intervals in the tube axis direction of the insertion tube. They may be spaced apart in parallel, may be disposed in three strips, or may be disposed in a plurality of four or more strips. The arcuate claws 6A and 6B are arranged in two rows in the circumferential direction, but may be arranged in three or more rows. In this case, although not shown, the tongue piece 6Ad is the first bow. It is provided not only on the claw 6A but also on the second arcuate claw 6B through the third arcuate claw 6C, and engages with the outer peripheral surface of the third arcuate claw or the fourth arcuate claw 6D.

  Further, these blade portions 6Ab, 6Ab and 6Bb, 6Bb are continuously arranged in the circumferential direction without interruption with respect to the arcuate claws 6A, 6B, and are further shifted from each other. According to this, since the wedge effect is reliably formed over a wide range on the arcuate claws 6A and 6B, the separation preventing force of the two-end pipes 1 and 2 can be increased. Note that the first blade portion and the second blade portion are not necessarily continuous in the circumferential direction with respect to the arcuate claw, and the first blade portion and the second blade portion are formed apart from the arcuate claw. May be.

  When a plurality of arcuate claws 6A are pressed by a pressing bolt 7 as a pressing means, the pressing force is transmitted to the outer peripheral surface of another arcuate claw 6B through a tongue piece 6Ad as shown in FIG. 3B. Since the parts 6Bb and 6Bb are bitten into the outer peripheral surface of the fluid pipe, the number of pressing means such as the push bolts 7 can be reduced, and the configuration of the press wheel 5 which is a detachment preventing main body can be simplified. As a result, it is possible to reduce the number of man-hours when assembling and mounting the push ring 5 as the detachment prevention main body to the insertion tube 1.

  Further, as shown in FIGS. 3 (a) and 3 (b), the recesses 4 and 4 are formed between the recesses 4 and 4 formed on the inner peripheral surface of the press ring 5 which is a detachment prevention main body, and the inside of the recesses 4 and 4 is in the axial direction of the fluid pipe. An inner wall 51 extending in the circumferential direction is formed for separation.

  As a result, since the recess 4 is separated by the inner wall 51, the arrangement positions of the arcuate claws 6A and 6B in the recess 4 can be accurately regulated, and the deviation of the arcuate claws 6A and 6B can be prevented to prevent the blade portion. 6Ab, 6Ab and 6Bb, 6Bb can exert the biting force.

  As shown in FIGS. 3A and 3B, an opening 51a is formed in the inner wall 51 at a position where the tongue piece 6Ad of the first arcuate claw 6A penetrates. Since the opening 51a is formed, when the first arcuate claw 6A is disposed in the recess 4, the tongue piece 6Ad of the first arcuate claw 6A can be disposed through the opening 51a of the inner wall 51. The positioning of the arcuate claw 6A can be accurately and easily performed in an arrangement shifted in the circumferential direction.

  Then, by fitting the tongue piece 6Ad of the first arcuate claw 6A into the opening 51a of the inner wall 51 formed in the recess 4, relative movement in the circumferential direction is restricted and stored in the pusher wheel 5. It has become.

  As shown in FIG. 4, the blade portions 6 </ b> Ab and 6 </ b> Bb of the first arcuate claw 6 </ b> A and the second arcuate claw 6 </ b> B have a curved shape so as to extend in the circumferential direction of the insertion tube 1. A tongue piece 6Ad is formed on the upper portion of the first arcuate claw 6A. And the tongue piece 6Ad penetrates the opening part 51a of the inner wall 51 of the press ring 5 which is a detachment | desorption prevention main body, and is engaged with the fall prevention structure part 13 formed in the 2nd bow-shaped nail | claw 6B. In the present embodiment, the tongue piece 6Ad of the first arcuate claw 6A is disposed on the right side when viewed from the front, and the fall prevention structure portion 13 of the second arcuate claw 6B is disposed substantially at the center when viewed from the front. The arrangement position of the tongue piece and the fall prevention structure part is not necessarily limited to the present embodiment, as long as at least one of the tongue piece and the fall prevention structure part is arranged at a place other than the center in front view, By doing in this way, a 1st arcuate nail | claw and a 2nd arcuate nail | claw will engage in the aspect shifted | deviated to the circumferential direction.

  Thereby, since the tongue piece 6Ad of the first arcuate claw 6A is locked to the fall prevention structure part 13 of the second arcuate claw 6B, both the arcuate claws 6A and 6B can be integrated into the recess 4 and integrated. Becomes easier.

  As shown in FIG. 5A, the fall prevention body 14 is interposed in the opening 51 a of the inner wall 51 of the pusher wheel 5. Thus, when the first arcuate claw 6A provided with the tongue piece 6Ad is attached to the opening 51a of the inner wall 51, the tongue piece 6Ad is sandwiched and locked by the fall prevention body 14 provided in the opening 51a. The arrangement position of the first arcuate claw 6A can be restricted, and the operation of attaching the first arcuate claw 6A to the recess 4 can be facilitated. The fall prevention body 14 may be formed of an elastic body such as rubber, and may not be an elastic body as long as the tongue piece 6Ad is sandwiched and locked by the opening 51a.

  Further, as shown in FIG. 5 (b), the tongue piece 6Ad passes through the opening 51a and engages with the fall prevention structure portion 13 of the second arcuate claw 6B. Since not only the first arcuate claw 6A but also the second arcuate claw 6B is positioned with respect to the portion, the operation of attaching both the arcuate claws 6A and 6B to the recess 4 can be facilitated.

  Further, as shown in FIG. 3, the anticorrosion member 12 is bonded to the first arcuate claw 6A and the second arcuate claw 6B from the surface of the blade parts 6Ab and 6Bb to the side surface on the side of the insertion tube 1 in the tube axis direction. Yes. Since the surfaces of the blade portions 6Ab and 6Bb of the arcuate claws 6A and 6B are covered with the anticorrosion member 12, the outer peripheral surface of the insertion tube 1 into which the anticorrosion member 12 bites into the blade portions 6Ab and 6Bb and the blade portions 6Ab and 6Bb. Therefore, corrosion of the outer peripheral surfaces of the blade portions 6Ab and 6Bb and the insertion tube 1 can be prevented, and the separation preventing effect can be maintained for a long time. In addition, as long as the anticorrosion member of this invention is provided in the surface of the blade part, for example, adhesion | attachment or adhering may be sufficient, or attachment aspects, such as fusion | fusion, vapor deposition, and fitting, may be sufficient.

  The anticorrosion member 12 is made of an elastic material such as moisture-curing urethane resin, natural rubber, urethane rubber, or other synthetic resin.

  Next, the pressing bolt 7 will be described. The pressing bolt 7 is screwed into the screw hole 10. As described above, the screw hole 10 is formed perpendicularly to the inner peripheral surface 4 a of the recess 4, and the outer peripheral surface 6 Aa of the first arcuate claw 6 A is at substantially the same angle as the inner peripheral surface 4 a of the recess 4. The taper surface 6Ac is inclined. Accordingly, the tip 7a of the pressing bolt 7 comes into contact with the taper surface 6Ac perpendicularly, and the pressing force of the pressing bolt 7 is efficiently transmitted to the first arcuate claw 6A, and the blade 6Ab is transmitted to the insertion tube 1 It can bite into the outer peripheral surface. Note that the pressing means for the arcuate claw is not limited to the pressing bolt as in the present embodiment. For example, the arcuate claw may be pressed using a spring member or an elastic member, or the inside of the recess may be used as the pressing means. A protrusion that protrudes in the inner diameter direction may be provided on the peripheral surface, and the arcuate claw may be pressed by the protrusion. Furthermore, the pressing means is not limited to one provided for one arcuate claw, and for example, a plurality of pressing means may be provided in the circumferential direction for one arcuate claw.

  Thus, when the blade portions 6Ab and 6Bb bite into the outer peripheral surface of the insertion tube 1, the blade portions 6Ab and 6Bb break through the anticorrosion member 12 and bite into the outer peripheral surface of the insertion tube 1, and this blade portion 6Ab, The contact portion between the blade portions 6Ab and 6Bb and the outer peripheral surface of the insertion tube 1 is anticorrosive by the close contact of the anticorrosion member 12 while elastically deforming the gap between 6Bb and the outer peripheral surface of the insertion tube 1.

  Next, regarding the first arcuate claw 6A, the second arcuate claw 6B, and the recess 4 when an external force is applied to the insertion tube 1 and the receiving tube 2 connected by the separation preventing device 3 in this way. explain.

  When an external force is applied to the insertion tube 1 and the receiving tube 2, the taper surface 6Ac of the first arcuate claw 6A abuts against the tip 7a of the pressing bolt 7 using this external force, and the pressing bolt The first arcuate claw 6A is pressed in the inner diameter direction by sliding the taper surface 6Ac along the distal end portion 7a, and the blade portion 6Ab further bites into the outer peripheral surface of the insertion tube 1. As a result, the locking force of the first arcuate claw 6 is further increased, and the detachment between the insertion tube 1 and the receiving tube 2 is prevented.

Then, the taper surface 6Ac slides along the tip portion 7a of the pressing bolt 7, whereby the first arcuate claw 6A is pressed in the inner diameter direction, and the blade portion 6Ab bites into the outer peripheral surface of the insertion tube 1. At the same time, the tapered inner surface of the tongue 6A d formed on the first arcuate pawl 6A contacts the tapered surface 6Bc of the outer peripheral surface 6Ba of the second arcuate pawl 6B, taper surface 6Bc of the second arcuate pawl 6B tongue piece by sliding along the tapered inner surface 6Adc of 6A d, the second arcuate pawl 6B also pressed radially inward, the blade portion 6Bb comes to further bite into the outer peripheral surface of the inserted pipe 1.

  Since a plurality of arcuate claws 6A and 6B are provided in the axial direction of the fluid pipe and are shifted from each other in the circumferential direction, not only the force for preventing the fluid pipe from detaching is doubled but also the blades of the arcuate claws 6A and 6B Since the biting force when the portions 6Ab and 6Bb bite is applied over a wide range in the direction of the outer peripheral surface of the fluid pipe and is distributed to a large number of blade portions 6Ab and 6Bb, it is formed on the outer peripheral surface and inner peripheral surface of the fluid pipe It can suppress that a crack and peeling generate | occur | produce in the anticorrosion layer.

  Accordingly, the pressing force and the detaching force of the push bolt 7 are efficiently acted in the inner diameter direction by a synergistic action between the tapered surfaces of the first arcuate claw 6A and the second arcuate claw 6B, and are in a wide range through a large number of blades. Therefore, it is possible to suppress the occurrence of cracking or peeling in the anticorrosion layer formed on the outer peripheral surface or inner peripheral surface of the insertion tube 1. Furthermore, even if the outer peripheral surface of the insertion tube 1 is bent, the blade portions 6Ab, 6Ab, 6Bb, and 6Bb can bite in reliably along the surface shape.

  As described above, according to the separation preventing device of the present invention, the press ring 5 having the recess 4 that is fitted on the outer peripheral surface of the insertion tube 1 and extends in the circumferential direction on the inner peripheral surface, and the recess 4 A plurality of arcuate claws 6A and 6B that are respectively housed and have blade portions 6Ab and 6Bb that can be eaten into the outer peripheral surface of the insertion tube 1 at the inner peripheral side tip portion, and are arranged shifted in the circumferential direction, and a first arcuate shape In the detachment preventing device 3 for the insertion tube 1, the blade portion 6 Ab is provided with a pressing bolt 7 that bites the blade portions 6 Ab and 6 Bb into the outer peripheral surface of the insertion tube 1 by pressing the tapered surface 6Ac of the claw 6 </ b> A. , 6Ab and 6Bb, 6Bb can exert a wide range of ability to prevent the both-end pipes 1 and 2 from coming off.

  Next, a separation preventing main body of the separation preventing apparatus according to the second embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 6, after inserting the insertion portion 1 a into the receiving portion 2 a, the flange 2 b extending in the outer diameter direction from the end portion of the receiving portion 2 a and the outer peripheral surface of the insertion portion 1 a The connecting member 19 to be attached is tightened and connected with bolts and nuts 22. A support ring 15 as a detachment prevention main body that covers the flange 2b and the connecting member 19 is attached to the inlet pipe 1 of the fluid pipe thus connected. The end of the support ring 15 on the side of the receiving port 2a is formed with a flange 15a having a protrusion 15b that protrudes toward the inner diameter of the receiving port 2a. 1 from the outer peripheral surface side to the rear end surface 2c side of the flange 2b. Accordingly, the support wheel 15 is supported by the receiving portion 2a via the flange 2b when the protrusion 15b comes into contact with the rear end surface 2c of the flange 2b and is locked so as not to be detached.

  The separation preventing device of the second embodiment is provided at the end of the support wheel 15 opposite to the flange. As a result, the flange at the time of connecting the flange 2b of the receiving portion 2a and the connecting member 19 of the insertion portion 1a with the bolt and nut 22 is used to connect the support wheel of the second embodiment to the flange. By engaging the flange portion, a function of preventing separation between the receiving portion 2a and the insertion portion 1a can be added.

  Next, a separation preventing main body of the separation preventing apparatus according to the third embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 7, a sealing member 27 is fitted into an annular gap provided in the entire circumferential direction of the inner peripheral surface of the receiving port 20 a, and the insertion port 1 a and the receiving port are formed by this sealing member 27. The portion 20a is closed in a sealed manner. In addition, a bulging portion 20b in which a part of the outer peripheral surface bulges along the circumferential direction toward the diameter increasing direction of the receiving portion 20a is formed at the distal end portion of the receiving portion 20a. A support ring 25 as a detachment prevention main body is provided so as to cover the bulging portion 20b formed in this way, and a flange portion 25a having a protrusion 25b protruding in the radial direction of the receiving portion 20a is provided. The rear end surface 20c of the bulging portion 20b is installed on the rear end surface 20c, and the rear end surface 20c of the bulging portion 20b and the projection 25b come into contact with each other and are locked so as not to be detached, so that they are received via the bulging portion 20b. It is supported by the mouth 20a.

  In the third embodiment, the detachment preventing device is connected to the insertion tube 1 and the reception tube 2 by inserting the insertion portion 1a into the reception portion 20a, and the insertion portion 1a is connected to the insertion portion 1a. An annular sealing member 27 that seals the insertion tube 1 and the reception tube 2 in a sealed manner is interposed in the gap with the reception port portion 20a. It is intended to prevent withdrawal.

  The support wheel 25 which is a detachment prevention main body is provided with a concave portion 40, and a peripheral surface of the concave portion 40 on the side of the insertion tube 1 is formed in a tapered shape whose diameter is reduced in the direction of the insertion tube 1. Furthermore, a screw hole 10 'perpendicular to the tube axis direction of the insertion tube 1 is formed in the support wheel 25 which is a detachment prevention main body, and a pressing bolt 7' is inserted into the screw hole 10 '. The Other configurations are the same as those in the first embodiment.

  Next, a separation preventing main body of the separation preventing apparatus according to the fourth embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 8, a sealing member 27 is fitted into an annular gap provided in the entire circumferential direction of the inner peripheral surface of the receiving portion 21 a, and the insertion portion 1 a and the receiving port are fitted by this sealing member 27. The portion 21a is closed in a sealed manner. Further, a concave portion 24 is provided on the inner peripheral surface of the distal end portion of the receiving portion 21a as a detachment preventing main body as in the first embodiment, and an arcuate claw is accommodated in the concave portion 24. Thus, by providing the recess 24 on the inner peripheral surface of the distal end portion of the receiving port 21a itself as a detachment prevention main body, the number of parts of the detachment prevention device for preventing the detachment of the fluid pipe can be reduced.

  Next, a separation preventing main body of the separation preventing apparatus according to the fifth embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

  As shown in FIG. 9, the first arcuate claw 60A and the second arcuate claw 60B are provided with separate push bolts 70 and 71, respectively, and the first arcuate claw 60A is not provided with a tongue piece. Is different. That is, each of the arcuate claws 60A and 60B is accommodated in the recesses 4 and 4 of the detachment preventing main body, and is arranged so as to be spaced apart in the axial direction of the insertion tube 1 and shifted in a separate circumferential direction. The bolts 70 and 71 are pressed. As in the first embodiment, the first arcuate claw 60A and the second arcuate claw 60B are arranged in a plurality of rows in the axial direction of the insertion tube 1 and shifted in the circumferential direction. The biting force when the blade portions 60Ab and 60Bb of 60A and 60B bite is applied over a wide range in the direction of the outer peripheral surface of the fluid pipe and is distributed to a large number of blade portions 60Ab and 60Bb. It can suppress that a crack and peeling generate | occur | produce in the anticorrosion layer formed in the internal peripheral surface. Even if the fluid pipe is bent and deformed, the arcuate claws 60A and 60B are arranged in a plurality of rows in the axial direction of the fluid pipe. Therefore, the blade portions 60Ab of the arcuate claws 60A and 60B along the bending deformation of the insertion tube 1 , 60Ab and 60Bb, 60Bb can bite into the outer peripheral surface of the insertion tube 1, and even if the insertion tube 1 is bent, it can be surely prevented from being detached.

  As in the first embodiment, the concave portion 4 is formed with an inner wall 51 extending in the circumferential direction for separating the inside of the concave portion 4 in the axial direction of the fluid pipe, whereby the concave portion 4 is separated by the inner wall 51. Therefore, the arrangement position of each of the arcuate claws 60A and 60B in the concave portion 4 can be accurately regulated, and the blade portions are prevented from coming into contact with the side walls of the concave portions 4 and 4 to prevent the deviation of the respective arcuate claws 60A and 60B. The biting force of 60Ab, 60Ab and 60Bb, 60Bb can be surely exhibited. The other configuration is the same as that of the first embodiment.

  In the fifth embodiment, the shapes of the two arched claws 60A and 60B are substantially rectangular in a plan view, and are the same shape. Therefore, it is not necessary to create two types of arched nails as in the first embodiment. . The two arcuate claws 60A and 60B are arranged side by side at a predetermined interval along the circumferential direction at substantially the same position in the pipe axis direction of the fluid pipe.

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

1 Inlet tube (fluid tube)
2 receiving pipe (fluid pipe)
3 Detachment prevention device 4 Recessed part 5 Press wheel (detachment prevention body)
6A, 6B Bow-shaped claw 6Ab, 6Bb Blade 6Ac, 6Bc Tapered surface (outer edge)
6Ad Tongue piece 7, 7 ', 70, 71 Press bolt (pressing means)
12 Corrosion prevention member 13 Fall prevention structure part 14 Fall prevention body 15 and 25 Support wheel (detachment prevention main body)
60A, 60B Bow Claw 60Ab, 60Bb Blade

Claims (7)

A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
A plurality of blade portions of each of the arcuate claws are provided apart from each other in the tube axis direction of the fluid pipe, and a plurality of the arcuate claws are arranged to be displaced in the axial direction of the fluid pipe and are shifted in the circumferential direction. A fluid pipe detachment prevention device characterized by being arranged. The inner wall extending in the circumferential direction for separating the inside of the recess in the axial direction of the fluid pipe is formed in the recess formed in the inner peripheral surface of the separation preventing main body. The fluid pipe detachment preventing device according to claim 1. 3. The fluid pipe detachment preventing device according to claim 1, wherein a tongue piece that engages with an outer peripheral surface of another arcuate claw is formed on at least one arcuate claw of the plurality of arcuate claws . The recess formed in the inner peripheral surface of the detachment prevention main body includes a circumferentially extending inner wall for separating the inside of the recess in the axial direction of the fluid pipe, and at least one arcuate claw of the plurality of arcuate claws. claims tongue engages the outer peripheral surface of the other arcuate pawl, and the predetermined position before Symbol inner wall, the tongue of the arcuate pawl characterized in that the opening penetrates is formed 1 The fluid pipe detachment preventing device according to claim 1.   5. The fluid pipe detachment preventing device according to claim 4, wherein a drop prevention body is provided in the opening portion of the inner wall through which the tongue piece of the arcuate claw penetrates. The said other arcuate pawl the tongue of said one arcuate pawl is engaged to claims 3, characterized in that anti-drop structure for locking the tongue piece is formed of 5 The fluid pipe detachment prevention device according to any one of the above.   The fluid pipe detachment preventing device according to any one of claims 1 to 6, wherein an anticorrosive member is provided on a surface of the blade portion of the arcuate claw.

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