JP5455082B2 - Lock ring for fittings - Google Patents

Description

  The present invention relates to a lock ring for a pipe joint used for a detachment prevention pipe joint such as a water pipe, and more particularly to a lock ring for a pipe joint used for a detachment prevention pipe joint for small diameter pipes, and a pipe joint using the same. Concerning structure.

  As a type of pipe joint that joins the receiving port and the insertion port of the tube body, a type in which an annular sealing material is compressed and interposed between the receiving port of one tube and the insertion port of the other tube There is.

  This type of anti-separation pipe joint is also called a seismic pipe joint. A seizure prevention mechanism is installed to prevent the insertion hole of the other pipe from being accidentally pulled out from the receiving port of one pipe due to an earthquake or the like. In many cases, it is used. This retaining mechanism forms a lock ring groove on the inner peripheral surface of the receiving port behind the portion where the seal material is interposed, and a centering ring and a lock ring for a pipe joint (hereinafter referred to as a lock ring for a pipe joint) are formed in the lock ring groove. , Referred to as “lock ring”).

  The tip of the insertion hole is provided with a retaining protrusion that protrudes to the outer diameter side.If you try to pull out the insertion hole with the insertion hole inserted in the receiving hole, the retaining protrusion will contact the lock ring. Thus, the retaining is made (see, for example, Patent Document 1 and Patent Document 2).

Japanese Utility Model Publication No. 6-28473 JP-A-7-260059

  In this type of anti-separation fitting, the centering ring is accommodated in the lock ring groove in the receiving port before the insertion port is inserted, and then the lock ring in a slightly reduced diameter is inserted into the inner diameter of the centering ring. The lock ring is accommodated at a predetermined position by releasing the diameter reduction.

  The centering ring is interposed in this way because the lock ring tries to expand its diameter by its own elastic force, whereas the centering ring regulates the expansion of the lock ring at a predetermined position. This is because the centering is performed at the regular position (the axial center of the tube on the receiving side and the lock ring is aligned). By this centering, when a force in the pulling direction is applied to the pipe joint, the retaining protrusions are brought into contact with the lock ring evenly around the tube axis to ensure the retaining function.

  However, in this type of separation preventing pipe joint, it is necessary to accommodate the centering ring in advance before the lock ring is accommodated in the lock ring groove. For this reason, the mounting work of the lock ring is complicated.

  In particular, in the case of a small-diameter pipe having a pipe diameter of 50 mm or less, it is difficult to insert a tool or a fingertip into a narrow space in the pipe during work. Furthermore, since the vicinity of the lock ring groove becomes a blind spot due to the inserted tool or fingertip, it is difficult to visually confirm the fitting state of the centering ring or the lock ring. For this reason, a lot of work time is required for housing the lock ring in the receiving port.

  Accordingly, an object of the present invention is to enable easy mounting of a lock ring of a separation preventing pipe joint.

  In order to solve the above-described problems, the present invention forms a lock ring groove on the inner surface of the receiving port, accommodates the lock ring in the lock ring groove, and has a protrusion protruding to the outer diameter side at the tip of the insertion port. A stop projection is provided, and when the insertion port is to be pulled out of the receiving port with the insertion port inserted into the receiving port, the retaining projection comes into contact with the lock ring and is prevented from being detached. In the pipe joint structure, the lock ring includes a split ring portion having an opening at one circumferential direction thereof, and a plurality of centering protrusions rising from the ring part in the outer diameter direction, and the centering protrusion Adopts a configuration in which the receiving port and the ring portion are centered by directly contacting the bottom surface of the lock ring groove.

According to this configuration, since the plurality of centering protrusions are provided in the ring portion of the lock ring, it is not necessary to use a separate centering ring for centering the lock ring. For this reason, the mounting work of the lock ring is easy.
In addition, since a centering ring is unnecessary, the work of inserting a tool or a fingertip into the pipe is minimal, and no time is required for housing the lock ring in the receiving port. For this reason, it becomes possible to easily attach the lock ring.

  Further, in this configuration, it is possible to employ a configuration in which the ring portion is a plate-like member and the plate surface of the plate-like member is directed to the inner diameter side and the outer diameter side.

If the ring portion is a plate-like member, the diameter of the lock ring can be easily reduced when the lock ring is accommodated in the receiving port. That is, as described in Patent Documents 1 and 2, the conventional lock ring is a solid member having a considerable member thickness in the radial direction with respect to the member length in the tube axis direction. For this reason, a large force is required to reduce the diameter of the lock ring, and the work is complicated, such as using a jig to maintain the reduced diameter and the reduced diameter state. In particular, in the case of a small diameter pipe, it is inserted into the receiving port. There was a problem that it was difficult.
However, by using the ring portion of the lock ring as a plate-like member as described above, the lock ring does not require a large force for reducing the diameter, and the lock ring can be mounted more easily. Further, if the ring portion is a plate-like member, it is possible to eliminate the use of a jig when reducing the diameter.

  In addition, it is preferable that the centering protrusion rises from an end on the back side (the back side in the receiving port) of the ring part in a state where the lock ring is housed in the lock ring groove in the receiving port. This is because, when the retainer functions, it is close to the point of action of the force applied to the lock ring from the retaining projection of the insertion opening, so that the force tends to act directly on the centering projection. Thereby, the accuracy of the centering function is enhanced.

  In addition, the centering protrusion can be formed in a columnar shape, a frustum shape, or a block shape having various shapes rising from the ring portion in the outer diameter direction. In addition, the centering protrusion can be formed into a plate-like piece that rises from the ring portion in the outer diameter direction, for example.

  When the centering protrusion is a plate-like piece, the direction of the front and back plate surfaces of the plate-like piece is free, but for example, the front and back plate surfaces extend along the circumferential direction of the lock ring, that is, the front and back sides. It can arrange | position so that the surface direction of a plate surface may be orthogonal to a pipe-axis direction. In this case, the outer edge of the plate-like piece can be brought into contact with the bottom surface of the lock ring groove within a certain length along the circumferential direction. For this reason, the accuracy of the centering can be increased by increasing the contact length in the circumferential direction related to the centering.

  Moreover, when making a centering protrusion into a plate-shaped piece, the plate-shaped piece can be made into the shape which connected the several plate-shaped piece from which the direction of the front and back board surface differs, for example. In this case, the plate-like piece in one direction is arranged so that the surface direction of the front and back plate surfaces is perpendicular to the tube axis direction, and the plate-like piece in the other direction is a plate-like piece perpendicular to the tube axis direction. It has a front and back board surface which cross | intersects the board surface of this. For example, it is possible to employ a configuration in which plate-like pieces whose front and back plate surfaces are orthogonal to the tube axis direction and plate-like pieces whose front and back plate surfaces are parallel to the tube axis direction are connected in an L shape in plan view. .

  Further, the number of centering protrusions having each of these configurations can be provided as many as necessary for centering the lock ring, and at least a plurality, preferably three or more, are provided. When the number of centering protrusions is three or more, it is desirable that two centering protrusions are arranged at both ends sandwiching the opening of the ring portion and the rest are equally divided between the both end portions along the circumferential direction. . Therefore, for example, when the number of centering protrusions is three, centering protrusions are provided at both ends sandwiching the opening of the ring part, and the remaining one is opposite to the opening with the axis of the ring part interposed therebetween. It is desirable to arrange in.

  Further, the plate-like member can be constituted by a tapered portion. The taper portion is gradually removed as the front and back plate surfaces of the plate-like member move from the end on the back side of the receiving port toward the end on the opening side while the lock ring is housed in the lock ring groove in the receiving port. It is desirable to have a direction toward the radial side. In this way, by using the plate-like member as a tapered portion, the lock ring receives the force applied to the lock ring from the retaining projection of the insertion opening in a state of spreading toward the end wall of the lock ring groove serving as a fulcrum. be able to. For this reason, it is possible to effectively counter the force in the direction in which the insertion opening is about to come off.

Moreover, the following structures are employable as a lock ring used for the pipe joint structure which consists of these each structure.
That is, the lock ring includes a split ring portion having an opening at one circumferential direction thereof, and a plurality of centering protrusions rising from the ring portion in the outer diameter direction, and the centering protrusion is formed in the lock ring groove. By direct contact with the bottom surface, the receiving port and the ring portion can be centered.

  According to the present invention, since it is not necessary to use a separate centering ring for centering the lock ring, the mounting operation of the lock ring is simple. In addition, since a centering ring is unnecessary, the work of inserting a tool or a fingertip into the pipe is minimal, and no time is required for housing the lock ring in the receiving port. For this reason, it becomes possible to easily attach the lock ring.

The perspective view which shows one Embodiment of this invention FIG. 1 shows details of the lock ring of FIG. 1, (a) is a plan view, (b) is a front view, (c) is a right side view of (b), and (d) is a rear view. The pipe joint structure of the embodiment is shown, (a) is a sectional view showing a state in which the lock ring is accommodated in the receiving port and the insertion port is to be inserted into the receiving port, and (b) is the insertion port in the receiving port. Cross-sectional view showing the inserted state, (c) Cross-sectional view showing the state where the insertion port is completely pushed into the receiving port, and (d) is a retaining protrusion on the lock ring when the insertion port is pulled out from the receiving port. Sectional view showing the state of contact The perspective view which shows the modification of embodiment of FIG. 4 shows details of the lock ring in FIG. 4, (a) is a plan view, (b) is a front view, and (c) is a right side view of (b). The perspective view which shows the further modification of embodiment of FIG. 6 shows details of the lock ring of FIG. 6, (a) is a plan view, (b) is a front view, (c) is a right side view of (b), and (d) is a rear view.

  An embodiment of the present invention will be described with reference to the drawings. This embodiment is a pipe joint structure provided with a retaining mechanism that prevents the insertion opening 1 of the other tubular body P from inadvertently coming out of the receiving opening 2 of one tubular body P due to an earthquake or the like, and its The present invention relates to a lock ring for a pipe joint used in a pipe joint structure.

  As shown in FIG. 3A, the pipe joint has a lock ring groove 2 a formed on the inner surface of the receiving port 2 over the entire circumference. A lock ring for a pipe joint (hereinafter referred to as “lock ring 10”) is accommodated in the lock ring groove 2a. The lock ring 10 is usually made of metal, but other materials such as resin can also be used. However, from the viewpoint of securing rigidity at the time of retaining, it is desirable that the material is spring steel, stainless steel, or stainless spring steel.

  Further, a stopper protrusion 1a is provided at the tip of the insertion slot 1 over the entire circumference protruding to the outer diameter side. The outer surface of the front end of the retaining projection 1a is a tapered surface 1b that approaches the outer diameter side from the front end side of the insertion port 1 toward the rear end side. An end wall 1c is provided at the rear end of the tapered surface 1b.

  When a force for pulling out the insertion port 1 from the receiving port 2 is applied due to an earthquake or the like with the insertion port 1 inserted into the receiving port 2, the retaining projection 1a contacts the lock ring 10 to prevent the retaining port 1 from coming off. It has been made.

  As shown in FIGS. 1 and 2, the structure of the lock ring 10 used in this pipe joint structure includes a split ring portion 10a having an opening at one circumferential direction, and an outer diameter direction from the ring portion 10a. And three centering protrusions 10b that stand up. Between the opposite end portions 10c and 10c of the C-shaped ring portion 10a is the opening, and the width W of the opening is reduced or enlarged when the lock ring 10 is expanded or contracted.

  In this embodiment, the centering protrusion 10b has a plate-like piece that rises from the outer surface of the ring portion 10a in the outer diameter direction. Further, the front and back plate surfaces of the plate-like pieces are arranged so as to extend along the circumferential direction of the lock ring 10, that is, the surface direction of the front and back plate surfaces is orthogonal to the tube axis direction. Further, the edge 10f on the outer diameter side of the plate-like piece has an arc shape along the bottom surface of the lock ring groove 2a. For this reason, the centering accuracy of the centering projection 10b is increased by increasing the contact length in the circumferential direction with respect to the bottom surface of the lock ring groove 2a during centering.

  Moreover, in this embodiment, the ring part 10a is comprised by the plate-shaped member, and has faced the plate | board surface of the plate-shaped member to the inner diameter side and the outer diameter side. In addition, the plate surface has a truncated cone shape that is inclined with respect to the axis of the lock ring 10 (coincided with the axis of the receiving port 2 when mounted in the lock ring groove 2a) on both the inner diameter side and the outer diameter side. A tapered portion 10d is formed. The taper portion 10d gradually moves to the outer diameter side from the end on the back side of the receiving port 2 toward the end on the opening side while the lock ring 10 is accommodated in the lock ring groove 2a in the receiving port 2. The direction is heading.

  Further, the centering protrusion 10b rises from the end on the back side (the back side in the receiving port 2) of the ring portion 10a in a state where the lock ring 10 is housed in the lock ring groove 2a in the receiving port 2. ing.

  The centering protrusions 10b can be provided as many as necessary for centering the lock ring 10, but in this embodiment, the centering protrusions 10b are provided at a total of three locations along the circumferential direction. Further, two of the three portions are both end portions 10c and 10c sandwiching the opening of the ring portion 10a, and the other one portion is a center between the both end portions 10c and 10c along the circumferential direction of the lock ring 10. That is, it arrange | positions on the opposite side of the said opening on both sides of the axial center of the ring part 10a.

  Hereinafter, a procedure for constructing a pipe joint by inserting the insertion opening 1 of the other tubular body P into the receiving opening 2 of one tubular body P will be described.

  First, as shown in FIG. 3A, the lock ring 10 is accommodated in the lock ring groove 2 a in the receiving port 2 before the insertion port 1 is inserted. The lock ring 10 has a slightly reduced diameter by reducing the width of the opening (width W in the circumferential direction) between the both end portions 10c, 10c, and maintains the state with the finger of the operator while maintaining the state with the finger of the operator. 10 is inserted into the lock ring groove 2a. Finally, by releasing the diameter reduction, the lock ring 10 expands while expanding the width W of the opening by its own elastic force. Thereby, it accommodates in the predetermined position in the lock ring groove | channel 2a.

  At this time, the edge 10f on the outer diameter side of the centering protrusion 10b of the lock ring 10 is brought into direct contact with the bottom surface of the lock ring groove, whereby the receiving port and the ring portion are centered. Since the end edge 10f has an arc shape along the bottom surface of the lock ring groove 2a, more accurate centering is possible. Note that the edge 10f of the centering protrusion 10b does not always abut against the bottom surface of the recess 2d provided in the lock ring groove 2a, but at least the edge 10f is locked when performing the retaining function. The centering function is exhibited by contacting the bottom surface of the ring groove 2a.

Thus, since it is not necessary to use a separate centering ring as in the prior art for centering the lock ring 10, the mounting operation of the lock ring 10 is simple.
Further, since the centering ring is unnecessary, the lock ring 10 can be easily mounted even in the case of a small-diameter pipe as in this embodiment.

In this embodiment, since the ring portion 10a is a plate-like member and the plate surface of the plate-like member is arranged toward the inner diameter side and the outer diameter side, the lock ring 10 exerts a large force on the reduced diameter. I don't need it. For this reason, since it is possible to maintain the reduced diameter and the reduced diameter state by an operator without using a jig, the mounting of the lock ring 10 is further simplified.
Conventionally, a joining tool (hydraulic cylinder, etc.) has been used in the joining work. By adopting this configuration, it is possible to easily insert at least a small-diameter pipe without using these joining tools. Can be joined to the receptacle.

When the insertion port 1 is inserted into the receiving port 2 from this state, the retaining projection 1a of the insertion port 1 gets over the lock ring 10, and the state shown in FIG.
During this overcoming, the taper 1b of the retaining projection 1a and the outer surface of the taper portion 10d of the ring portion 10a of the lock ring 10 are in sliding contact with each other, so that the insertion port 1 can be inserted smoothly.

Next, a rubber ring 3 is interposed between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 1 to ensure watertightness between the receiving port 2 and the insertion port 1.
First, as shown on the left side of FIG. 3B, the push ring 4 is placed at the rear end of the rubber ring 3, and the push ring 4 and the flange 2b of the receiving port 2 are connected to the bolt 5a and the nut 5b. The fastening member 5 is tightened. By this tightening, the push wheel 4 and the flange 2b are gradually brought closer to each other. Finally, as shown in FIG. 3 (c), when the push ring 4 and the flange 2b come into contact with each other, the rubber ring 3 is pushed into a predetermined position, and the desired water tightness can be exhibited. ing. Thereby, construction of the pipe joint structure is completed. In addition to the structure using the fastening member 5 of this embodiment, other structures can be adopted for the pushing-in and fixing structure of the rubber ring 3.

When an external force in the pulling direction due to an earthquake or the like acts on the pipe joint while the pipe body P group having this pipe joint structure is in use, the insertion slot 1 moves relative to the receiving slot 2 in a direction that pulls out.
As a result of this relative movement, the end wall 1c of the retaining projection 1a comes into contact with the front end of the lock ring 10 as shown by a solid line in FIG. At this time, the lock ring 10 is pushed back by the retaining protrusion 1a and slightly retracts (approaching the opening side of the receiving port 2), but the rear end 10e of the ring portion 10a contacts the end wall 2c of the lock ring groove 2a. Further contact is regulated by contact. Thereby, the insertion port 1 is not pulled out from the receiving port 2 any more, and is prevented from coming off.

  At this time, the centering protrusion 10b is detached from the recess 2d provided in the lock ring groove 2a, and as shown by a solid line in FIG. 3D, the end edges 10f of all the centering protrusions 10b are locked to the lock ring groove 2a. It touches the bottom of the. For this reason, when the retaining function is exhibited, the lock ring 10 is properly centered, and the force from the lock ring 10 can be received evenly in the circumferential direction.

  Further, since the plate-like member constituting the ring portion 10a is a tapered portion 10d, the lock ring 10 is a lock ring that uses the force applied to the lock ring 10 from the retaining projection 1a of the insertion port 1 as a fulcrum. It can be received in a divergent state toward the end wall 2c of the groove 2a. For this reason, it is possible to effectively counter the force in the direction in which the insertion slot 1 is about to come out.

Further, the centering protrusion 10b of the lock ring 10 rises from the end on the back side (the back side in the receiving port 2) of the ring portion 10a. That is, the centering protrusion 10b is located at a position close to the point of application of the force applied to the lock ring 10 from the retaining protrusion 1a of the insertion slot 1 when the retaining function functions. For this reason, when a force is applied to the lock ring 10 from the retaining protrusion 1a of the insertion slot 1, the force is likely to act directly on the centering protrusion 10b. Thereby, the accuracy of the centering function is enhanced.
The centering protrusion 10b can also exhibit a function of preventing the lock ring 10 from entering the back side of the receiving port 2 when the tubes are joined to each other. Since the centering projection 10b rises from the end on the back side (the back side in the receiving port 2) of the ring portion 10a, the centering projection 10b is the end wall on the back side of the lock ring groove 2a. It is because it contacts.

  4 and 5 show a modification of this embodiment. In this modification, the shapes of the end portions 10c and 10c sandwiching the opening of the ring portion 10a are changed.

  In other words, in the above-described embodiment, the opposite edges of the end portions 10c and 10c are in a form in which the distance between the end portions 10c and 10c gradually increases over the entire length from the front end to the rear end 10e. . On the other hand, in this modified example, the facing edges of the end portions 10c and 10c extend in parallel from the front end toward the rear end 10e in the middle, and from the middle between the front end and the rear end 10e to the rear end 10e. Up to this point, the distance between each other gradually increases.

  6 and 7 show a further modification of this embodiment. In this modification, the shape of the centering protrusions 10b and 10b sandwiching the opening of the ring portion 10a is changed to an L shape in plan view in the examples of FIGS.

  That is, the centering protrusions 10b on both sides sandwiching the opening of the ring portion 10a are respectively a circumferential portion 10g made of a plate-like piece in which the surface direction of the front and back plate surfaces is orthogonal to the tube axis direction, and the surface of the front and back plate surfaces It is the structure which connected the axial direction part 10h which consists of a plate-shaped piece with a direction parallel to a pipe-axis direction in planar view L-shape. Further, the edge 10f on the outer diameter side of the circumferential portion 10g has an arc shape along the bottom surface of the lock ring groove 2a, and the edge 10f on the outer diameter side of the axial portion 10h is parallel to the tube axis direction. It has a shape along the cylindrical bottom surface of the lock ring groove 2a.

  Since the centering protrusion 10b is L-shaped in plan view, the rigidity of the centering protrusion 10b is enhanced. Therefore, when a force is applied to the lock ring 10 from the retaining protrusion 1a of the insertion opening 1, even if the centering protrusion 10b abuts against the wall surface of the lock ring groove 2a in the tube axis direction, the centering protrusion 10b The accuracy of the centering function can be maintained without excessive deformation.

  In these embodiments, the lock ring 10 is applied to a small-diameter pipe fitting. However, the lock ring 10 having each of these configurations is applicable to a pipe joint of a relatively large-diameter pipe other than the small-diameter pipe. Can also be used.

1 Insertion Port 1a Retaining Protrusion 2 Receiving Port 2a Lock Ring Groove 2b Flange 2c End Wall 2d Recess 3 Rubber Wheel 4 Push Wheel 5 Tightening Member 5a Bolt 5b Nut 10 Lock Ring 10a Ring Portion 10b Centering Protrusion 10c End Portion 10d Taper Part 10e rear end 10f edge 10g circumferential direction part 10h axial direction part

Claims (2)

A lock ring groove (2a) is formed on the inner surface of the receiving port (2), the lock ring (10) is accommodated in the lock ring groove (2a), and the distal end of the insertion port (1) projects to the outer diameter side. When the insertion opening (1) is to be pulled out from the receiving opening (2) in a state where the insertion opening (1) is inserted into the receiving opening (2) In the pipe joint structure in which the retaining protrusion (1a) abuts against the lock ring (10) and is retained,
The lock ring (10) includes a split ring portion (10a) having an opening in one circumferential direction, and a plurality of centering protrusions (10b) rising from the ring portion (10a) in the outer diameter direction. Provided, the centering projection (10b) is in direct contact with the bottom surface of the lock ring groove (2a), thereby centering the receiving port (2) and the ring portion (10a) .
The ring portion (10a) is composed of a plate-like member that gradually goes to the outer diameter side from the end on the tube axis direction back side in the receiving port (2) toward the end on the tube axis direction opening side , the plate surface of the plate-like member toward Ke on the inner diameter side and outer diameter side, the ring portion (10a) is housed in said lock ring groove (2a), said centering projection (10b) is the ring portion ( pipe joint structure characterized in that rises from the end of the pipe axial innermost side of 10a). It is a lock ring (10) used for the pipe joint structure of Claim 1 , Comprising: The split ring part (10a) which has an opening in the circumferential direction 1 place, and an outer diameter from the ring part (10a) A plurality of centering protrusions (10b) rising in the direction are provided, and the centering protrusion (10b) is in direct contact with the bottom surface of the lock ring groove (2a), so that the receiving port (2) and the ring part (10a) ) And can be centered ,
The ring portion (10a) is composed of a plate-like member that gradually goes to the outer diameter side from the end on the tube axis direction back side in the receiving port (2) toward the end on the tube axis direction opening side, The ring portion (10a) can be accommodated in the lock ring groove (2a) with the plate surface of the plate-shaped member facing the inner diameter side and the outer diameter side, and the centering protrusion (10b) is the ring portion (10a) The lock ring which stands up from the end of the tube axis direction back side .

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