JP2013104433A - Rust prevention ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rust prevention ring, with which an adhesion state between a pipe end face and a holding part of the ring is firmly maintained and a rust prevention member is prevented from extending toward an elastic member inner diameter side from between the pipe end face and the holding part.SOLUTION: An extended part 5c of the rust prevention ring includes a locking part 5f to be locked on an outer circumferential surface 3c of a spigot pipe 3, and is tapered to reduce the diameter as the part separating from a holding part 5d in an axial direction of the pipe. In the holding part 5d, at least a top end part 5e at an inner diameter side of the holding part 5d directs radially inward from the extended part 5c and gradually protruding toward an end face 3b of the spigot pipe 3. An elastic member 5b is fitted to the end face 3b of the spigot pipe 3. Thereby, the extended part 5c elastically deforms along the outer circumferential surface 3c of the spigot pipe 3, while the holding part 5d elastically deforms along the end face 3b of the spigot pipe 3.

Description

  The present invention relates to a rust preventive member having flexibility for covering and rust-proofing the end face of a fluid pipe, an extension part extending in the pipe axis direction along the outer peripheral surface of the fluid pipe, and the extension part And an annular elastic member that is elastically deformable and includes a holding portion that holds the anticorrosion member between the end surface and the end surface of the fluid pipe. And a rust preventive ring fitted to the end of the fluid pipe.

  Conventionally, a ring main body (extension part) that can be externally fitted to an end part (insertion part) of a pipe body (fluid pipe), and an inward projecting piece (holding part) formed in an inner diameter direction from an inner peripheral edge of one end part of the ring main body ) And an anticorrosion ring (elastic member). Such an anticorrosion ring has a rubber adhesive (rust preventive member) disposed on the surface of the inwardly projecting piece facing the tip surface (tube end surface) of the tube, and the anticorrosion ring is externally fitted to the tube. In this way, a rubber adhesive is adhered to the distal end surface of the tubular body to prevent rusting of the distal end surface of the tubular body, and the ring body is engaged with the end of the tubular body by the adhesive force of the rubber based adhesive (for example, , See Patent Document 1).

Japanese Utility Model Publication No. 7-22198 (5th page, Fig. 2)

  However, in the rust preventive member described in Patent Document 1, the anticorrosion ring (elastic member) is externally fitted to the end portion (insertion portion) of the pipe body (fluid pipe), and the front end face (pipe end face) of the pipe body. ) When a rubber adhesive (rust prevention member) is bonded to the tip surface to prevent rust, the rubber adhesive part of the anticorrosion ring is inserted between the tip surface of the tube and the inward protruding piece (holding part). There is a problem that the rubber adhesive is extended toward the inner diameter side, and the extended portion of the rubber adhesive is mixed into the fluid flowing through the pipe. In addition, the tip of the tube and the inward projecting piece are bonded only with a rubber-based adhesive, and the close contact state is not sufficient. There is consideration to do.

  The present invention has been made paying attention to such problems, and the tight contact state between the tube end surface and the holding portion is firmly held, and from the space between the tube end surface and the holding portion toward the inner diameter side of the elastic member. An object of the present invention is to provide a rust preventive ring that is prevented from being extended.

In order to solve the above problems, the rust preventive ring of the present invention is
A rust preventive member with flexibility to cover the end face of the fluid pipe and prevent rust;
An extending part extending in the pipe axis direction along the outer peripheral surface of the fluid pipe, and extending in the pipe radial direction along the end face of the fluid pipe continuous to the extending part, and between the end face It consists of a holding part that holds a rust preventive member, is composed of an elastic elastic ring that can be elastically deformed, and is a rust preventive ring that is fitted to the end of a fluid pipe,
The extending portion has a locking portion that locks to the outer peripheral surface of the fluid pipe, and is formed in a tapered shape that is separated from the holding portion in the tube axis direction and has a reduced diameter.
The holding portion is formed such that at least a tip portion on the inner diameter side of the holding portion protrudes gradually from the extending portion toward the inner diameter direction and toward the end surface of the fluid pipe,
The elastic member is fitted to the end of the fluid pipe, so that the extending portion elastically deforms along the outer peripheral surface of the fluid pipe, and the holding portion elastically deforms along the end surface of the fluid pipe. It is characterized by being to do.
According to this feature, the extending portion and the holding portion of the elastic member locked to the outer peripheral surface of the fluid pipe by the locking portion are formed in the inner diameter direction and the end face of the fluid pipe generated by elastic deformation along the fluid pipe. The elastic restoring force that goes to the fluid pipe can be used as a fitting force to the fluid pipe of the rust prevention ring and the pressing force that presses the rust prevention member against the end face of the fluid pipe. The rust preventive member accommodating region is provided between the end face of the fluid pipe and the holding portion, while preventing the flexible rust preventive member covering the end face of the fluid pipe from leaking in the inner diameter direction. It is possible to form a rust-proof state.

The rust preventive ring of the present invention is
The holding part is formed with a crush prevention part for preventing crushing of the rust preventive member sandwiched between the holding part and the end face of the fluid pipe by contacting the end face of the fluid pipe. Yes.
According to this feature, the collapsing prevention part abuts against the end surface of the fluid pipe, so that the rust preventing member can be prevented from being crushed.

The rust preventive ring of the present invention is
The holding part is characterized in that a gap part serving as a clearance for the rust preventive member sandwiched between the holding part and the end face of the fluid pipe is recessed.
According to this feature, the rust preventive member clamped by the holding portion and the end face of the fluid pipe can be guided to the gap portion that has been recessed in advance, so that the rust preventive member leaks to an unexpected location. There is no.

The rust preventive ring of the present invention is
The holding portion is characterized by being formed in a substantially concave shape in the tube radial direction from the base end portion of the holding portion on the extending portion side to the distal end portion that gradually protrudes toward the end surface of the fluid pipe.
According to this feature, the flexible rust preventive member can be stably provided in the holding portion formed in a substantially concave shape in the tube diameter direction, and the rust preventive ring is easy to handle.

The rust preventive ring of the present invention is
The holding portion is in contact with the inner surface of the receiving pipe into which the fluid pipe fitted with the rust prevention ring is inserted, thereby forming a pressing portion that can press the rust prevention member on the end face of the fluid pipe. It is characterized by being.
According to this feature, the pressing portion formed in the holding portion utilizes the contact with the inner surface of the receiving pipe accompanying the insertion of the fluid pipe fitted with the rust-proof ring into the receiving pipe, and the antirust member Can be pressed against the end face of the fluid pipe, and the pressed state can be maintained as long as the fluid pipe is inserted into the receiving pipe.

It is a sectional side view which shows the aspect by which the insertion tube with which the rust prevention ring in Example 1 was fitted was inserted in the receiving tube. (A) is a front view which shows the rust prevention ring in Example 1, (b) is a sectional side view similarly. (A), (b), (c) is a side sectional view showing the process of attaching the rust prevention ring in Example 1 to the end of an insertion tube, and (d) shows the modification of a coating layer. It is a sectional side view. It is a sectional side view which shows the process in which the insertion tube with which the rust prevention ring in Example 1 was fitted is inserted in a receiving tube. It is a sectional side view which shows the aspect in which the antirust ring of Example 1 was contact | abutted to the back end surface of the receiving pipe. It is a sectional side view which shows the antirust ring in Example 2. FIG. It is a sectional side view which shows the rust prevention ring in Example 3. FIG. 10 is a side sectional view showing a modified example of the concave portion of the third embodiment. FIG. 10 is a side cross-sectional view showing another modified example of the concave portion of the third embodiment. It is a sectional side view which shows the rust prevention ring in Example 4. It is a sectional side view of the modification of the antirust ring of Example 4. It is a sectional side view which shows the antirust ring in Example 5. It is a sectional side view of the modification of the antirust ring of Example 5. It is a sectional side view which shows the antirust ring in Example 6. It is a sectional side view of the rust prevention ring which shows the modification of a rust prevention member. It is a sectional side view of the rust prevention ring which shows another modification of a rust prevention member.

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

  A rust prevention ring according to Example 1 will be described with reference to FIGS. 1 to 5. First, reference numeral 5 in FIG. 1 is a rust prevention ring to which the present invention is applied.

  As shown in FIG. 1, the receiving pipe 2 and the insertion pipe 3 which is a fluid pipe in the present embodiment are, for example, ductile cast iron pipes manufactured by cooling after pouring ductile cast iron into a mold, It is mainly buried in the ground and used for water supply. In addition, although not shown in figure, innumerable uneven parts are engraved over the entire inner surface of the ductile cast iron pipe mold, thereby forming an uneven surface 3c on the outer peripheral surface of the insertion tube 3. Similarly, an uneven surface (not shown) is formed on the outer peripheral surface of the receiving tube 2. Note that the receiving tube and the insertion tube may be made of steel or other cast iron as long as they are made of metal. Further, in the present 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, industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

  In addition, the inner peripheral surfaces of the inlet tube 2 and the inlet tube 3 are made of mortar or powder paint as rust prevention treatment for preventing rust from the fluid flowing in the inlet tube 3 and the inlet tube 2. A coating layer 10 is formed.

  A receiving portion 2a having a diameter larger than that of other portions of the receiving tube 2 is formed at the end of the receiving tube 2 in the tube axis direction, and the tip of the receiving portion 2a has an inner diameter as an insertion tube. 3 is formed on the inner peripheral surface 2b having a larger diameter than the outer diameter of 3. A plurality of groove portions 2c that open toward the tube axis at predetermined intervals in the circumferential direction and bolt holes 2d that communicate with different groove portions 2c are formed at the distal end portion of the receiving portion 2a. In these grooves 2c, a fixed claw 6 made of a metal material or the like and having a sharp blade 6a at the end facing the tube axis side is disposed, and a bolt 7d is connected to the communicating bolt hole 2d. Is screwed. For this reason, the fixed claw 6 is pressed in the inner diameter direction by screwing the bolt 7.

  Moreover, the insertion part 3a which can be inserted in the receiving part 2a is formed in the edge part of the tube-axis direction side of the insertion tube 3. As shown in FIG. The tube end surface 3b of the insertion portion 3a is a cut surface formed by cutting the insertion tube 3 substantially orthogonally to the tube axis, and is a metal substrate of the insertion tube 3 itself (in this embodiment, ductile cast iron ) Is exposed.

  Further, an annular fitting groove 2e is formed on the inner peripheral surface 2b of the receiving portion 2a on the insertion direction side of the insertion portion 3a with respect to the groove portion 2c. The fitting groove 2e is fitted with a seal member 4 that prevents fluid from leaking from between the receiving portion 2a and the insertion portion 3a. Specifically, the seal member 4 includes a fitting portion 4a that can be fitted into the fitting groove 2e. From the fitting portion 4a, the inner peripheral surface 2b of the receiving portion 2a and the uneven surface 3c of the insertion portion 3a. A valve portion 4b for sealing the gap extends. This prevents fluid from leaking from between the receiving port 2a and the insertion port 3a.

  Further, in the inner side of the inner peripheral surface 2b of the receiving part 2a, on the back side of the fitting groove 2e, the pipe shaft is substantially connected to the inner peripheral surface 2g having a smaller diameter than the tip of the receiving part 2a. An annular back end face 2h that is vertical is formed.

  In the receiving tube 2 and the insertion tube 3 connected in this way, the rust prevention ring 5 of the present invention is fitted to the end of the insertion tube 3. As shown in FIGS. 2 (a) and 2 (b), the rust preventive ring 5 is a rust preventive member having the flexibility of covering the entire end of the tube end surface 3b of the insertion port 3a to prevent rust. 5a and a ring-shaped elastic member 5b that can be elastically deformed.

  More specifically, the rust preventive member 5a of the present embodiment is a low rebound resilience material, that is, a material having a relatively low rebound resilience, and is composed of butyl rubber having adhesive strength. The elastic member 5b is made of a soft resin material such as polypropylene, polycarbonate, polyacetal, or urethane resin, or a metal such as stainless steel. The rust preventive member 5a is made of butyl rubber in this embodiment. However, if it has more flexibility than the elastic member 5b, the elastic member such as natural rubber, urethane rubber, etc., soft vinyl chloride / styrene, etc. It may be a soft resin such as olefin or olefin, or a putty / epoxy resin adhesive.

  The elastic member 5b includes an extending portion 5c extending in the tube axis direction along the uneven surface 3c of the insertion tube 3, and a tube diameter extending along the tube end surface 3b of the insertion tube 3 continuously to the extending portion 5c. The holding part 5d is provided extending in the direction and holding the rust preventive member 5a between the pipe end surface 3b.

  The extending portion 5c has a locking portion 5f that is locked to the concavo-convex surface 3c of the insertion tube 3, and this locking portion 5f is entirely formed on the inner peripheral surface of the extending portion 5c in this embodiment. Two ridges are formed so as to protrude in the inner diameter direction of the insertion tube 3 over the circumference and are spaced apart in the tube axis direction. Further, in this embodiment, the rust preventive member 5a has a cross-sectional shape extending along the holding portion 5d from the base end portion 5k on the extending portion 5c side of the holding portion 5d, and is fixed to the holding portion 5d with an adhesive or the like. ing. Further, the rust preventive member 5a is shorter in the tube diameter direction than the holding portion 5d. That is, the rust preventive member 5a is not provided at the distal end portion 5e of the holding portion 5d. In addition, the latching | locking part may be provided in the inner peripheral surface of the extending part only by 1 line | wire, or multiple 3 or more articles | strands, and may be provided partially in the circumferential direction.

  As shown in FIG. 2B, the extending portion 5c is formed in a tapered shape that is separated from the holding portion 5d in the tube axis direction and is reduced in diameter in a natural state where the extending portion 5c is not elastically deformed. Thus, the diameter of the elastic member 5b on the holding portion 5d side is slightly longer than the diameter of the insertion portion 3a. In addition, the holding portion 5d is formed such that the distal end portion 5e of the holding portion 5d protrudes gradually from the extending portion 5c toward the inner diameter direction and toward the tube end surface 3b of the insertion tube 3 (see FIG. 3). That is, the elastic member 5b forms an acute angle with a substantially V-shaped cross-sectional view by the extending portion 5c and the holding portion 5d. Further, as described above, the tube end surface 3b is a cut surface that is cut substantially orthogonal to the tube axis. Therefore, the tube end surface 3b and the uneven surface 3c that is the outer peripheral surface of the insertion tube 3 are substantially the same. The elastic member 5b has a smaller opening angle than the end of the insertion tube 3 in a natural state.

  Therefore, the elastic member 5b is only fitted to the end portion of the insertion tube 3, so that the extending portion 5c is elastically deformed along the uneven surface 3c of the insertion tube 3, and the holding portion 5d is similarly formed. The tube is elastically deformed along the tube end surface 3 b of the insertion tube 3.

  In this way, the extending portion 5c and the holding portion 5d are elastically deformed along the concave and convex surface 3c and the tube end surface 3b of the insertion tube 3, respectively, so that the elasticity is directed toward the inner diameter direction of the insertion tube 3 and toward the tube end surface 3b. A restoring force is generated, and this elastic restoring force can be used as a fitting force of the insertion tube 3 of the rust prevention ring 5 and a pressing force for pressing the rust prevention member 5 a against the tube end surface 3 b of the insertion tube 3. Particularly, the distal end portion 5e of the holding portion 5d gradually protrudes toward the tube end surface 3b, and an elastic restoring force is generated toward the tube end surface 3b, so that the tube end surface 3b and the distal end portion 5e of the holding portion 5d are in contact with each other. The rust preventive member 5a can be reliably prevented from leaking out in the inner diameter direction, and a large storage area for the rust preventive member 5a can be formed between the pipe end surface 3b and the holding portion 5d to ensure a rust preventive state. it can. Further, as described above, the rust preventive member 5a is shorter than the holding portion 5d in the tube diameter direction, and thus is formed to be smaller than this accommodation region, so there is no concern of overflowing from the accommodation region.

  Next, a procedure for attaching the rust prevention ring 5 to the insertion portion 3a will be described. First, as shown in FIG. 3A, the rust prevention ring 5 is arranged on the tube axis of the insertion tube 3, and the rust prevention member 5a side of the holding portion 5d of the rust prevention ring 5 is connected to the insertion portion 3a. It is made to oppose with the pipe end surface 3b. Then, as shown in FIG. 3 (b), the extension portion 5c formed in a tapered shape that gradually decreases in diameter toward the insertion tube 3 side of the rust prevention ring 5 is pressed against the insertion portion 3a. The rust preventive member 5a is inserted into the tube end surface by the holding portion 5d by inserting the rust preventive ring 5 toward the tube end surface 3b of the insertion portion 3a while being in sliding contact with the uneven surface 3c with the diameter of the portion expanded. Press toward 3b.

  By the pressing of the rust preventive member 5a to the pipe end surface 3b by the holding portion 5d, the rust preventive member 5a is elastically deformed into a shape in close contact with the pipe end surface 3b as shown in FIG. The locking portions 5f and 5f are brought into close contact with each other and are engaged with the concave portions of the concave and convex surface 3c by the elastic restoring force in the reduced diameter direction of the extending portions 5c.

  At this time, the rust preventive member 5a is brought into close contact with the pipe end surface 3b in the elastically deformed state by the adhesive force of the rust preventive member 5a itself made of butyl rubber, and has low repulsion that the rust preventive member 5a itself made of butyl rubber has. When a force for elastic recovery in the range of elasticity acts in the tube axis direction, the locking portions 5f and 5f protruding from the extending portion 5c are stronger against the recesses formed on the uneven surface 3c. Is engaged. By the concave / convex engagement between the locking portions 5f, 5f and the concave portion of the concave / convex surface 3c, the rust prevention ring 5 is pressed in the radial direction by the extending portion 5c disposed on the outer diameter side of the insertion portion 3a. Positioning is performed with respect to the mouth 3a.

  Furthermore, the rust preventive member 5a is elastically deformed between the holding portion 5d and the tube end surface 3b by the elastic restoring force of the holding portion 5d in the direction of the tube end surface 3b and is held in close contact with the tube end surface 3b. That is, since the pipe end surface 3b is always urged by the tip portion 5e of the holding portion 5d, the rust preventive member 5a enters between the tip portion 5e and the pipe end surface 3b into the fluid path of the two-end pipes 2 and 3. In addition to suppressing leakage, the pipe end surface 3b and the holding portion 5d do not peel off or bend.

  In the present embodiment, the radial dimension of the holding portion 5d is longer than the metal base portion of the ductile cast iron on the outer peripheral side of the tube end surface 3b, and the insertion portion 3a including the coating layer 10 is included. Since the rust prevention member 5a and the holding portion 5d are formed to be shorter than the wall thickness, the rust prevention member 5a and the holding portion 5d are formed on the outer peripheral side of the pipe end surface 3b while rust-proofing the entire metal base portion of the ductile cast iron. The tip portion 5 e is disposed in contact with the outer diameter side of the inner diameter side end portion of the coating layer 10. For this reason, not only can the rust preventive member 5a be completely prevented from leaking into the fluid path of the two-end pipes 2 and 3 from between the front end portion 5e of the holding portion 5d and the pipe end surface 3b, but also the holding portion 5d. The distal end portion 5e is not projected into the fluid path of the both-end pipes 2 and 3, and is not subjected to the drag that is received from the fluid flowing in the both-end pipes 2 and 3, or the tube cleaning member. Further, even if the tip 5e of the holding portion 5d may protrude into the fluid path of the two-port pipes 2 and 3 due to tolerance of the outer diameter that occurs in each fluid pipe, the protruding dimension of the tip 5e is the maximum. Since it is controlled to be less than about 0.5 mm and does not leak out the rust preventive member 5a, it does not affect the fluid in the tube or various members that are circulated and inserted into the tube.

  For example, as shown in FIG. 3D, in the case where the coating layer is a thin coating layer formed of a powder paint, the tip of the holding portion is positioned on the outer diameter side of the inner diameter side end of the coating layer. The length of the holding portion in the inner diameter direction is cut so as to be arranged. For this reason, like the present embodiment, the tip of the holding portion can suppress the drag received from the fluid flowing in the two-end pipes 2 and 3 to be small. The length of the holding portion in the inner diameter direction is not limited to being cut, and a rust prevention ring having a holding portion designed to be attached to a thin coating layer in advance may be applied.

  After the rust prevention ring 5 is attached to the insertion portion 3a, the fitting portion 4a of the seal member 4 is fitted over the entire circumference of the fitting groove 2e as shown in FIG. Is inserted into the receiving portion 2a up to the front end 2h. Thus, as shown in FIG. 1 described above, the valve portion 4b is elastically deformed by the concave and convex surface 3c of the insertion portion 3a and the inner peripheral surface 2b of the reception portion 2a, and the insertion portion 3a and the reception portion. The space between 2a is sealed. Then, the bolt 7 is tightened toward the concave and convex surface 3c of the insertion tube 3, and the fixing claw 6 is pressed and fixed to the reception tube 2, thereby connecting the insertion tube 3 and the reception tube 2. Complete.

  In addition, as shown in FIG. 5, the insertion portion 3a to which the rust prevention ring 5 is attached may be inserted into the receiving portion 2a until it comes into contact with the rear end surface 2h, and the holding portion 5d is pressed by the rear end surface 2h. By doing so, the rust preventive member 5a can be clamped between the pipe end surface 3b and the holding portion 5d more strongly.

  As described above, in the rust prevention ring 5 in the present embodiment, the rust prevention member 5 a having the flexibility of covering the tube end surface 3 b of the insertion tube 3 and preventing rust, and the outer peripheral surface of the insertion tube 3. An extending portion 5c extending in the tube axis direction along the concavo-convex surface 3c, and extending in the tube diameter direction along the tube end surface 3b of the insertion tube 3 continuously to the extending portion 5c, and the tube end surface 3b A rust preventive ring 5 which is composed of a holding elastic member 5d for holding a rust preventive member 5a and is formed of an elastic elastic deformable annular elastic member 5b. The extending portion 5c has a locking portion 5f that is locked to the concave and convex surface 3c of the insertion tube 3, and is formed in a tapered shape that is separated from the holding portion 5d in the tube axis direction and has a reduced diameter. The holding portion 5d is formed so that the distal end portion 5e of the holding portion 5d is directed from the extending portion 5c toward the inner diameter and toward the tube end surface 3b of the insertion tube 3. The elastic member 5b is formed so as to protrude gradually, and the extension portion 5c is elastically deformed along the uneven surface 3c of the insertion tube 3 and is held by being fitted to the end of the insertion tube 3. The portion 5 d is elastically deformed along the tube end surface 3 b of the insertion tube 3. As a result, the extending portion 5c and the holding portion 5d of the elastic member 5b, which are locked to the uneven surface 3c of the insertion tube 3 by the locking portion 5f, are elastically deformed along the insertion tube 3, thereby generating an inner diameter. The direction and the elastic restoring force toward the tube end surface 3b of the insertion tube 3 are used as the pressing force for pressing the rust preventive ring 5 against the tube end surface 3b of the insertion tube 3 In addition to being able to be used, the distal end portion 5e on the inner diameter side of the holding portion 5d gradually protrudes toward the tube end surface 3b of the insertion tube 3, so that the flexible rust prevention coating the tube end surface 3b of the insertion tube 3 is possible. Leakage of the member 5a in the inner diameter direction can be prevented, and an accommodation region for the rust prevention member 5a can be formed between the tube end surface 3b of the insertion tube 3 and the holding portion 5d, and a rust prevention state can be secured.

  In particular, the rust preventive ring 5 of the present invention uses the elastic restoring force of the elastic member 5b itself, and has a fitting force to the insertion tube 3 and a pressing force for pressing the rust preventive member 5a against the pipe end surface 3b. Since the rust preventive ring 5 is firmly attached to the inlet tube 3 alone, the end portion of the insert tube 3 to which the rust preventive ring 5 is attached is connected to the rear end surface of the receiver tube 2 as shown in FIG. Therefore, it is not necessary to abut against 2h, and therefore, it is possible to avoid the possibility of damaging each other due to the abutment of both the mouthpieces 2 and 3.

  In the present embodiment, the insertion tube 3 and the receiving tube 2 are connected to each other by bolts from the groove 2c formed at the distal end of the receiving portion 2a so that the fixing claw 6 faces the uneven surface 3c of the insertion tube 3. However, the present invention is not limited to this. For example, a flange extending in the outer diameter direction is provided at the distal end of the receiving portion, and a push ring or the like is provided on the outer peripheral surface of the insertion tube. You may make it connect by making it fit and tightening them with fixing means, such as a volt | bolt and a nut.

  Next, a rust prevention ring according to Example 2 will be described with reference to FIG. The description of the same configuration as that in the above embodiment is omitted. Hereinafter, the left side of FIG. 6 will be described as the front side (front side) of the rust prevention ring 51.

  As shown in FIG. 6, the holding portion 51 d of the rust prevention ring 51 has a crush prevention portion 11 protruding in the front direction on the tube end surface 3 b side of the insertion tube 3 in the circumferential direction. A plurality are provided. This crushing prevention part 11 is brought into contact with the tube end surface 3b of the insertion tube 3, so that the rust preventive member 5a sandwiched between the holding unit 51d and the tube end surface 3b of the insertion tube 3 is prevented from being excessively crushed. The Moreover, this crush prevention part 11 has rigidity from the rust prevention member 5a by being formed with the same raw material as the holding | maintenance part 51d.

  Since the collapsing prevention part 11 abuts on the tube end surface 3b of the insertion tube 3, the rust preventing member 5a can be prevented from being crushed too much, so that an accommodation area for the deformed rust preventing member 5a is secured, and the rust preventing member 5a is not leaked from the accommodation area, and can be rusted over the entire tube end surface 3b of the insertion tube 3.

  In this embodiment, the plurality of crush prevention parts 11 are provided in the circumferential direction partially on the front side of the holding part 51d. However, the present invention is not limited to this. For example, the crushing prevention part 11 is continuous in the circumferential direction on the front side of the holding part. One or more may be provided. Moreover, this crush prevention part is not restricted to the same raw material as a holding | maintenance part, What is necessary is just to have rigidity rather than a rust prevention member.

  Next, a rust prevention ring according to Example 3 will be described with reference to FIGS. The description of the same configuration as that in the above embodiment is omitted. Hereinafter, the left side of FIG. 7 will be described as the front side (front side) of the rust prevention ring 52.

  As shown in FIG. 7, the holding portion 52d in the rust prevention ring 52 is formed with a recess 12 that opens in the front direction of the holding portion 52d. In this embodiment, the concave portion 12 is formed in the front direction of the holding portion 52d by projecting a part of the tip portion 52e side to the back side while the holding portion 52d maintains the thickness in the radial direction.

  The concave portion 12 is a gap portion of the present invention that serves as a clearance for the rust preventive member 5 a sandwiched between the holding portion 52 d and the tube end surface 3 b of the insertion tube 3, and the tube of the holding portion 52 d and the insertion tube 3. Since the rust preventive member 5a clamped by the end surface 3b can be guided and escaped to the recess 12 provided in advance, the rust preventive member 5a does not leak to an unexpected location.

  In the present embodiment, the holding portion 52d is partially protruded to the back side while maintaining the thickness in the radial direction, so that the concave portion 12 is formed in the front direction. As shown in FIG. 4, a relatively thick holding portion 52d ′ is formed in the rust prevention ring 52 ′, and a concave portion 12 ′ is formed from the front direction so that a part of the holding portion 52d ′ is thinned. The pressed rust preventive member 5a may be guided to the recess 12 'and escaped. Moreover, this recessed part may be provided in two or more some partially in the circumferential direction, and may form a ditch | groove continuously in the circumferential direction. Furthermore, a plurality of the concave grooves continuous in the circumferential direction may be formed in the radial direction.

  In this embodiment, the recess 12 is provided in a part of the holding portion 52d on the tip 52e side. However, the present invention is not limited to this, and for example, the holding portion of the rust prevention ring 521 as shown in FIG. A recess 121 is provided on the side facing the distal end 521e of 521d, that is, on the base end 521k side of the holding portion 521d, and the rust preventive member 5a that is pinched is guided to the recess 121 that is previously recessed so as to escape. Alternatively, it may be anything that opens in the front direction of the holding part and is provided except for the front end edge of the holding part.

  Next, a rust prevention ring according to Example 4 will be described with reference to FIGS. The description of the same configuration as that in the above embodiment is omitted. Hereinafter, the left side in FIG. 10 will be described as the front side (front side) of the rust prevention ring 53.

  As shown in FIG. 10, the holding portion 53 d of the rust prevention ring 53 extends from the base end portion 53 k on the extending portion 5 c side of the holding portion 53 d to the distal end portion 53 e that gradually protrudes toward the tube end surface 3 b of the insertion tube 3. The holding groove 13 is formed in a substantially concave shape on the front side in the tube diameter direction and formed in an arc shape in a sectional view, thereby opening the holding groove 13 on the front side of the holding portion 53d. The holding groove 13 can stably provide the flexible rust preventive member 5a inside, can hold the rust preventive member 5a abundantly, and can easily handle the rust preventive ring 53.

  As shown in FIG. 11, the holding portion 53 d ′ of the rust prevention ring 53 ′ having the same configuration as described above is protruded in the front direction from the holding groove 13 ′ described in the above embodiment. A crush prevention part 11 ′ may be formed. In this manner, the retaining groove 13 ′ formed in a substantially concave shape can stably provide the rust preventive member 5a having a relatively high flexibility and easy to reach the entire surface of the pipe end surface 3b. The member 5a can be held. Furthermore, the rust preventive member 5a having a relatively high flexibility can be reliably prevented from being crushed and the rust preventive member 5a can be evenly brought into contact with the pipe end surface 3b.

  Next, a rust prevention ring according to Example 5 will be described with reference to FIGS. The description of the same configuration as that in the above embodiment is omitted. In the following, the left side of FIG. 12 is described as the front side (front side) of the rust prevention ring 54.

  As shown in FIG. 12, the holding portion 54d in the rust prevention ring 54 includes a leakage prevention portion 54p that protrudes in a ring shape toward the front direction around the tip portion 54e, and a ring shape that protrudes in a ring shape toward the back surface. An abutting portion 54m which is a pressing portion of the present invention provided is formed. The abutment portion 54m can press the rust preventive member 5a against the tube end surface 3b of the insertion tube 3 in an auxiliary manner.

  More specifically, after the rust prevention ring 54 is fitted to the tube end surface 3 b of the insertion tube 3, the insertion tube 3 is inserted toward the back end surface 2 h of the receiving tube 2, so that the first contact is made. The portion 54m comes into contact with the back end surface 2h. Accordingly, the holding portion 54d strongly pushes the rust preventive member 5a by the pressing force due to the contact with the back end surface 2h in addition to the elastic restoring force toward the tube end surface 3b of the holding portion 54d itself. The tube end surface 3b can be pressed. Further, the leakage preventing portion 54p is brought into direct contact with the pipe end surface 3b by this pressing, and the leakage preventing portion 54p is formed in an annular shape, whereby the rust preventive member 5a is fluid between the insertion tube 3 and the receiving tube 2. Leakage into the road is completely prevented.

  That is, the abutment portion 54m formed on the holding portion 54d utilizes the abutment to the back end surface 2h associated with the insertion of the insertion tube 3 fitted with the rust prevention ring 54 into the receiving tube 2 to prevent the contact. Not only can the rust member 5 a be pressed against the tube end surface 3 b of the insertion tube 3, but the pressed state can be maintained as long as the insertion tube 3 is inserted into the receiving tube 2.

  As shown in FIG. 13, the contact portion 54m 'may be formed by bending the tip of the holding portion 54d' of the rust prevention ring 54 'toward the back surface of the holding portion 54d'.

  Next, a rust prevention ring 55 according to Example 6 will be described with reference to FIG. The description of the same configuration as that in the above embodiment is omitted. Hereinafter, the left side of FIG. 14 will be described as the front side (front side) of the rust prevention ring 55.

  As shown in FIG. 14, the holding portion 55d in the rust prevention ring 55 is formed such that the holding portion front surface 5g, which is the surface on the front surface side of the elastic member 55b, gradually protrudes toward the tube end surface 3b of the insertion tube 3. The holding part back surface 5h, which is the back side surface of the elastic member 55b, is formed so as to be substantially parallel to the end surface of the fluid pipe. Thus, when the holding portion 55d is pressed against the back end surface 2h and pressed, a wide range of the holding portion back surface 5h comes into contact with the back end surface 2h, and the holding portion front surface 5g The tube end surface 3b can be pressed with a surface.

  Thus, the shape of the holding part may be such that at least the tip on the inner diameter side is formed so as to gradually protrude from the extending part toward the inner diameter and toward the end face 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.

  For example, FIG. 15 shows a mode in which a rust preventive member 5a ', which is a modification of the rust preventive member of the present invention, is applied to the elastic member 5b shown in the first embodiment. As described above, the shape of the rust preventive member may be provided with the substantially circular rust preventive member 5a ′ at the base end portion 5k on the extending portion 5c side of the holding portion 5d in a cross-sectional view. As long as the rust preventive member is not provided, the rust preventive member may be formed between the pipe end surface of the fluid pipe and the holding portion so that the rust preventive member is smaller than the accommodating region of the rust preventive member.

  Further, for example, FIG. 16 shows a mode in which a rust prevention member 5 a ″ which is another modification of the rust prevention member of the present invention is applied to the elastic member 5 b shown in the first embodiment. Thus, a rust preventive member may not be provided at the base end portion 5k of the holding portion 5d, and the gap 5j may be formed. This gap 5j may be used as a clearance for the rust preventive member, and can be applied as various modes.

2 Receptacle tube 3 Inlet tube (fluid tube)
3b Pipe end surface 5 Rust prevention ring 5a Rust prevention member 5b Elastic member 5c Extension portion 5d Holding portion 5e Tip portion 5f Locking portion 5k Base end portion 11 Crush prevention portion 12 Recess 13 Holding groove 54m Contact portion (pressing portion)
54p Leakage prevention part

Claims (5)

A rust preventive member with flexibility to cover the end face of the fluid pipe and prevent rust;
An extending part extending in the pipe axis direction along the outer peripheral surface of the fluid pipe, and extending in the pipe radial direction along the end face of the fluid pipe continuous to the extending part, and between the end face It consists of a holding part that holds a rust preventive member, is composed of an elastic elastic ring that can be elastically deformed, and is a rust preventive ring that is fitted to the end of a fluid pipe,
The extending portion has a locking portion that locks to the outer peripheral surface of the fluid pipe, and is formed in a tapered shape that is separated from the holding portion in the tube axis direction and has a reduced diameter.
The holding portion is formed such that at least a tip portion on the inner diameter side of the holding portion protrudes gradually from the extending portion toward the inner diameter direction and toward the end surface of the fluid pipe,
The elastic member is fitted to the end of the fluid pipe, so that the extending portion elastically deforms along the outer peripheral surface of the fluid pipe, and the holding portion elastically deforms along the end surface of the fluid pipe. A rust-proof ring characterized by   The holding part is formed with a crush prevention part for preventing crushing of the rust preventive member sandwiched between the holding part and the end face of the fluid pipe by contacting the end face of the fluid pipe. The rust preventive ring according to claim 1.   The anti-rotation device according to claim 1 or 2, wherein a gap portion serving as a clearance for the rust prevention member sandwiched between the holding portion and an end surface of the fluid pipe is recessed in the holding portion. Rust ring.   The holding portion is formed in a substantially concave shape in a pipe radial direction from a base end portion on the extension portion side of the holding portion to the distal end portion that gradually protrudes toward an end surface of a fluid pipe. Item 4. The rust preventive ring according to any one of Items 1 to 3.   The holding portion is in contact with the inner surface of the receiving pipe into which the fluid pipe fitted with the rust prevention ring is inserted, thereby forming a pressing portion that can press the rust prevention member on the end face of the fluid pipe. The rust preventive ring according to any one of claims 1 to 4, wherein the rust preventive ring is provided.

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