JP2006177432A - Connection joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection joint which allows easy connection of a pipe body and achieves reliable coming-off prevention of the pipe body. <P>SOLUTION: A connection joint 1 is employed to connect piping 51 with piping 52 and equipped with a joint body 2 and a clip member 3. The joint body 2 contains a large-diameter connection part 5 and a small-diameter connection part 6 having an outer diameter smaller than the large-diameter connection part has, wherein a fastening part 7 made up of a plurality of fastening pieces 15 is provided to the outer periphery of the joint body. In the joint body 2, the clearance between the small-diameter connection part 6 and the fastening piece 15 is thinner than the wall thickness of the second pipe body. When connecting the small-diameter connection part 6 with the piping 52, therefore, the fastening piece 15 bulges outside. By inserting the joint body 2 into the piping 51 with the small-diameter connection part 6 connected with the piping 52, the fastening piece 15 is deflected to the small-diameter connection part 6 side and made to bite into the surface of the piping 52. When the clip member 3 is mounted in this state, the joint body 2 is prevented from coming off from the piping 51, so that the piping 51 is firmly connected with the piping 52. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connection joint for connecting pipe bodies.

  Conventionally, in devices such as a hot water supply system and a hot water heating system, a flow path for flowing a fluid such as hot water is formed of a resin pipe body such as polyethylene (PE), and this pipe body is connected via a connection joint. It is set as the structure connected to the connection port of equipment, such as a heat source machine, a circulation adapter, and a heating terminal. Many of the connection joints employed in the prior art are provided with a connection portion having a plurality of stepped portions on one end side of a joint body obtained by cutting a metal material such as brass, and equipment such as a heating device on the other end side. It is set as the structure which provided the seal | sticker part inserted in this connection port.

  The connection joint as described above has the following problems. In other words, when using the connection joint of the prior art, in order to securely connect the connection part formed in a step shape and the pipe body, an annular fastening band made of metal or the like is used to press-fit the connection part. It is necessary to fasten the tube body and the connecting portion from the outer peripheral side of the formed tube body. Therefore, if it is neglected to put the tightening band on the tube side before inserting the connecting portion into the tube body, it must be removed once by pulling out the tube body or tearing the tube body.

Therefore, in view of such a problem, as disclosed in Patent Document 1 below, a connection joint is provided in which a tightening body that integrally performs a function corresponding to the tightening band described above is integrally formed with respect to the joint body. Yes.
JP 2001-066575 A

  Patent Document 1 discloses two types of tightening bodies. One is a type in which a conventional metal fastening band is integrally insert-molded during resin molding, and the other is a type in which a fastening body is integrally molded with resin. However, the above-mentioned joint for resin pipe has the following problems. That is, in a case where a metal fastening band is insert-molded, it is necessary to expand the fastening band when the tubular body is press-fitted into the joint body, so that it is difficult to connect the tubular bodies. In the case where the fastening body is integrally formed with the joint body, the fastening force for fastening the tube body depends on the elastic force of the resin fastening body. Therefore, in order to hold the tube firmly, it is necessary to examine the strength and dimensions of the resin material, which may increase the size of the joint body and increase the cost.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a connection joint that can easily connect the tubular body and can also reliably prevent the tubular body from coming off. It is to provide.

  Accordingly, the invention according to claim 1 provided to solve the above-described problem connects the first tubular body and the second tubular body having an outer diameter smaller than that of the first tubular body. A connecting joint, which is inserted into the inside of the first tubular body so that the outer peripheral surface is in surface contact with the inner peripheral surface of the first tubular body; By connecting the two tubular bodies, the outer peripheral surface is in contact with the inner peripheral surface of the second tubular body, and the small diameter connecting portion extends from the large diameter connecting portion side to the small diameter connecting portion side. And a fastening portion having flexibility in a direction approaching / separating from the first tubular body, and by inserting the fastening portion into the first tubular body, the gap between the fastening portion and the small-diameter connection portion is the second tubular body. It is a connection joint characterized by becoming narrower than the wall thickness.

  In the connection joint of the present invention, the fastening portion has flexibility, and when inserted into the first tubular body, the gap between the fastening portion and the small diameter connecting portion becomes narrower than that of the second tubular body. Therefore, when the second tube is connected to the small diameter connecting portion, and the large diameter connecting portion and a part or all of the fastening portion are inserted into the first tube, the second tube is connected to the fastening portion. And the small diameter connection portion. Therefore, according to the connection joint of the present invention, an operation of inserting the large-diameter connection portion and a part or all of the fastening portion into the first tube body, and an operation of connecting the second tube body to the small-diameter connection portion. It is possible to firmly connect the first tubular body and the second tubular body simply by performing the above.

  The invention according to claim 2 is characterized in that a part or all of the fastening portion is fitted into a gap between the inner peripheral surface of the first tubular body and the outer peripheral surface of the second tubular body. 1 is a connection joint.

  In the connection joint of the present invention, the fastening portion is fitted between the first tube body and the second tube body, and functions as a wedge. Therefore, according to the connection joint of the present invention, the first tubular body and the second tubular body can be firmly connected.

  In a third aspect of the invention, by connecting the second tubular body to the small diameter connecting portion, the fastening portion comes into contact with the outer peripheral surface of the second tubular body in a direction away from the small diameter connecting portion. 3. The connection joint according to claim 1, wherein the fastening portion is bent and brought into close contact with the second tubular body connected to the small-diameter connecting portion by being bent and inserted into the first tubular body. is there.

  According to this configuration, the first tube body and the second tube body can be easily and firmly connected.

  The invention according to claim 4 is the connection joint according to any one of claims 1 to 3, wherein the fastening portion has a protrusion protruding toward the small-diameter connection portion.

  When the first tubular body and the second tubular body are connected by the connection joint of the present invention, the protrusion provided on the fastening portion is caught on the outer peripheral surface of the second tubular body. Therefore, according to the above-described configuration, the connection strength between the second tubular body, the connection joint, and the first tubular body can be improved.

  Here, the connection joint according to any one of claims 1 to 4 may be formed by integrally molding a large-diameter connection portion, a small-diameter connection portion, and a fastening portion (claim 5).

  According to such a configuration, the manufacturing process can be reduced and the processing cost can be reduced.

  Moreover, the connection joint in any one of the said Claim 1 thru | or 4 is good also as a structure which integrated the fastening part with respect to the connection part main body provided with the large diameter connection part and the small diameter connection part (Claim 6). .

  In the connection joint of the present invention, for example, the connection joint is made of resin, the fastening portion is made of metal, the strength is secured, and the fastening portion can be thinned. Therefore, according to this invention, while being able to select an optimal raw material from viewpoints, such as intensity | strength, about a connection part main body and a fastening part, the magnitude | size (outer diameter) of a connection joint can be made compact.

  The invention according to claim 7 is that the seal part is integrally formed on the outer peripheral surface of the large diameter connection part and / or the small diameter connection part, and the seal part is made of a material different from other parts. The connection joint according to any one of claims 1 to 6, wherein the connection joint is characterized in that:

  The connection joint of the present invention includes, for example, a nitrile rubber (NBR), a hydrogenated nitrile rubber (HNBR), a fluorine rubber (FKM), a silicone rubber (VMQ), an ethylene propylene rubber (EPDM), a chloroprene rubber (CR), Used in so-called O-rings such as acrylic rubber (ACM), butyl rubber (IIR), urethane rubber (U), chlorosulfonated polyethylene (CSM), epichlorohydrin rubber (CO, ECO), natural rubber (NR), etc. In addition to selecting a material with such a high sealing property, other parts are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polycarbonate (PC), acrylonitrile butadiene styrene ( ABS), polyamide (nylon) (PA), etc. And selected from known materials, it may be provided with integrally molded. According to such a configuration, the first tubular body or the second tubular body and the connection joint can be firmly fixed without separately attaching a sealing member such as an O-ring to the large diameter connecting portion or the small diameter connecting portion. Connection between bodies can be performed easily and reliably. In addition, when setting it as this structure, it is desirable for the material of parts other than the seal part of a connection joint to be a material whose hardness is higher than the material of a 2nd pipe body.

  The invention according to claim 8 has a joint body provided with a large-diameter connection portion, a small-diameter connection portion and a fastening portion, and the entire joint body can be accommodated in the first tubular body. A connecting joint according to any one of claims 1 to 7.

  The connection joint of the present invention is used in a state where the entire or part of the joint body is accommodated inside the first tube body and is not exposed to the outside, so that even if the joint body is made of resin Deterioration due to such effects is difficult to occur.

  The invention according to claim 9 is provided with a joint body provided with a large-diameter connection portion, a small-diameter connection portion and a fastening portion, and a clip member, and the clip member engages with an end portion of the first tubular body. By doing so, the movement of the first tubular body in the axial direction is prevented, and by engaging with the first tubular body, the first tubular body is interposed between the first tubular body and the second tubular body. The connecting joint according to any one of claims 1 to 8, further comprising a transverse portion that traverses an opening region of the gap formed in the inner space.

  In the connection joint of the present invention, the large-diameter connection portion and the small-diameter connection portion of the joint body are accommodated in a gap formed between the first tube body and the second tube body, and a part of the fastening portion Or it becomes the structure in which all are accommodated. Therefore, when the clip member is attached to the first tubular body, the crossing portion crosses the gap between the first tubular body and the second tubular body, and the movement of the joint body in the axial direction is restricted. The Therefore, according to the present invention, it is possible to reliably prevent the joint body attached to the first tubular body from falling off.

  ADVANTAGE OF THE INVENTION According to this invention, the connection coupling which can perform the connection of a pipe body easily and can also perform the prevention of removal of a pipe body can be provided.

  Subsequently, a connection joint according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a connection joint of the present embodiment. FIG. 2 is a front view showing an example of a usage state of the connection joint shown in FIG. 1. Fig.3 (a) is a front view which shows the coupling main body of the connection coupling shown in FIG. 1, (b) is sectional drawing which shows the coupling main body shown in (a). FIG. 4 is a perspective view showing a state in which the connection main body is observed from the opposite direction to the posture shown in FIG. Fig.5 (a) is a front view which shows the clip member which comprises the connection coupling shown in FIG. 1, (b) is a perspective view of the clip member shown to (a). 6 (a) to 6 (d) are cross-sectional views schematically showing a procedure for connecting a connecting pipe and piping using the connecting joint shown in FIG. 1, respectively. 7 and 8 are perspective views showing one process of connecting the connecting pipe and the pipe by the connecting joint shown in FIG. 1, respectively. FIG. 9 is a view in the direction of arrow B in FIG. 10 and 11, (a) is a cross-sectional view showing a modification of the joint body of the present embodiment, and (b) is a cross-sectional view showing a state in which pipes are connected by the joint body shown in (a). FIG. 12 is a cross-sectional view showing another modification of the joint body of the present embodiment. 13A is a front view showing a modification of the joint body shown in FIG. 3, and FIG. 13B is a front view showing a state in which a part of the joint body of the modification of the joint body shown in FIG. is there. In FIG. 9, each member is hatched for convenience of explanation.

  In FIG. 1, 1 is a connection joint of this embodiment. The entire connecting joint 1 is integrally formed of resin. As shown in FIG. 2, a pipe 51 (first tube) and a pipe 52 (second pipe) provided in a device 50 such as a heat source device. Body).

  As shown in FIG. 1, the connection joint 1 includes a joint body 2 and a clip member 3. The joint body 2 has a substantially cylindrical outer diameter, and an outer shape is formed by the large-diameter connection portion 5, the small-diameter connection portion 6 and the fastening portion 7, and penetrates through the large-diameter connection portion 5 and the small-diameter connection portion 6. It has a hole 8.

  As shown in FIG. 6, the large-diameter connection portion 5 has an outer diameter D that is substantially the same as the inner diameter of the pipe 51 provided on the device 50 side. As shown in FIGS. 1 and 3, a plurality of grooves 10 (two in the present embodiment) are arranged in the axial direction of the large-diameter connection portion 5 on the outer peripheral surface of the large-diameter connection portion 5. A seal member 11 such as an O-ring is attached to the groove 10.

  The small diameter connecting portion 6 is a portion that is inserted into the pipe 52 and is an axial portion that is molded integrally with the large diameter connecting portion 5. The diameter d of the circumscribed circle of the small diameter connecting portion 6 is smaller than the outer diameter D of the large diameter connecting portion 5 and is substantially the same as the inner diameter of the pipe 52. The small-diameter connection portion 6 has a structure in which the axial center of the small-diameter connection portion 5 and the large-diameter connection portion 5 substantially coincide with each other, and a through hole 8 for flowing a fluid such as hot water is provided at the axial center position. As shown in FIG. 3 and the like, the small-diameter connecting portion 6 includes a plurality of tapered step portions 13 that are expanded in diameter as they approach the large-diameter connecting portion 5 in the axial direction from the distal end side of the small-diameter connecting portion 6. The shape is made.

  As shown in FIGS. 3 and 4, the fastening portion 7 is configured by a plurality (eight in the present embodiment) of fastening pieces 15. Each of the fastening pieces 15 is a protruding piece whose outer periphery is substantially flush with the outer peripheral surface of the large-diameter connection portion 5 and extends in the extending direction of the small-diameter connection portion 6, and surrounds the outer periphery of the small-diameter connection portion 6. . The fastening piece 15 is configured to be able to bend in the direction approaching or separating from the small diameter connecting portion 6, that is, in the radial direction of the large diameter connecting portion 5. The fastening piece 15 has a claw 16 at the tip (end in the extending direction of the small diameter connecting portion 6). The claw 16 protrudes in a substantially chevron shape from the inner peripheral surface of the fastening portion 7 toward the small diameter connection portion 6 side. That is, the claw 16 has a top portion 17 protruding toward the small diameter connecting portion 6.

  In the joint body 2, the gap t between the top portion 17 of the claw 16 provided on each fastening piece 15 and the circumscribed surface of the small diameter connecting portion 6 is narrower than the wall thickness T of the pipe 52. Therefore, when the joint body 2 connects the pipe 52 to the small-diameter connection portion 6, the fastening piece 15 is connected to the radially outer side of the joint body 2, that is, from the small-diameter connection section 6 by the pipe 52 as shown in FIG. The claw 16 is pressed and bent in the direction of separating, and the claw 16 is in close contact with the outer peripheral surface of the pipe 52.

  The clip member 3 is a member that is mounted across the pipe 51 and the pipe 52 after the pipe 52 is connected to the pipe 51 on the device 50 side by the joint body 2, and the joint body 2 and the pipe 52 are connected from the pipe 51. It is a member for preventing falling off. The clip member 3 is processed by bending a single metal plate.

  As shown in FIGS. 1, 5, 7, and the like, the clip member 3 has a large-diameter portion 20 having a large opening diameter and a small-diameter portion 21 having a small opening diameter arranged vertically. The structure is connected via the end portion 23. The large-diameter portion 20 and the small-diameter portion 21 are arranged with a predetermined interval in the vertical direction, and a gap 25 is formed between the large-diameter portion 20 and the small-diameter portion 21.

  The knob portion 22 is a portion protruding in a substantially rectangular shape toward the radially outer side with respect to the large diameter portion 20 and the small diameter portion 21, and in addition to the effect of connecting the large diameter portion 20 and the small diameter portion 21, the clip member 3. It is a part that also has a function as a knob when attaching and detaching. The end portion 23 is a portion that is bent radially outward with respect to the large-diameter portion 20 and the small-diameter portion 21, and connects the end portions of the large-diameter portion 20 and the small-diameter portion 21 in the vertical direction. Therefore, the large-diameter portion 20 and the small-diameter portion 21 are in a state where both ends are held by the knob portion 22 and the end portion 23, and the interval p3 between the large-diameter portion 20 and the small-diameter portion 21 is kept constant. Has been.

  As shown in FIG. 9 and the like, the large diameter portion 20 has an opening diameter p1 that is substantially the same as the outer diameter P1 of the pipe 51. The small diameter portion 21 has an opening diameter p <b> 2 that is substantially the same as the outer diameter P <b> 2 of the pipe 52. The distance between the large diameter portion 20 and the small diameter portion 21, that is, the height p3 of the gap 25 is substantially the same as the thickness P3 of the flange 51a provided on the opening end side of the pipe 51 as shown in FIG. Therefore, when the clip member 3 is inserted so that the flange 51a fits into the gap 25 in a state where the large diameter portion 20 is directed to the pipe 51 side relative to the flange 51a, the clip member 3 is shown in FIG. 6 (d) and FIG. As described above, the large-diameter portion 20 is in a state of sandwiching the outer peripheral surface of the pipe 51 and cannot move in the axial direction of the pipe 51 (the direction of arrow A in FIG. 8).

  Subsequently, a connection method and a connection structure of the pipe 51 and the pipe 52 by the connection joint 1 of the present embodiment will be described in detail with reference to the drawings. When connecting the pipe 51 and the pipe 52, first, as shown in FIGS. 6A and 6B, the small diameter connecting portion 6 of the joint body 2 is inserted into the end of the pipe 52. Here, as described above, in the joint body 2, the gap t between the top portion 17 of the claw 16 provided at the end portion of the fastening piece 15 and the circumscribed surface of the small diameter connecting portion 6 is the thickness T of the pipe 52. It is narrower than. When the small diameter connecting portion 6 and the pipe 52 are connected, the fastening piece 15 is pushed away in a direction away from the small diameter connecting portion 6 by the pipe 52 and is bent. As a result, the pipe 52 is sandwiched over the entire circumference by the eight fastening pieces 15 arranged at equal intervals on the outer circumference of the small-diameter connection portion 6.

  When the pipe 52 is connected to the small diameter connecting portion 6 as described above, the joint body 2 is pushed into the opening portion of the pipe 51 with the large diameter connecting portion 5 at the head, as shown in FIG. When the joint main body 2 is pushed in until the end portion (the claw 16 side portion) of the fastening portion 7 is fitted in the pipe 51, the joint main body 2 is bent outward in the radial direction as shown in FIG. Each fastening piece 15 is pushed back to the small diameter connecting portion 6 side. As a result, the claw 16 existing on the end side of the fastening piece 15 (the lower end side in the posture shown in FIG. 6) is in a state of being bitten into the outer peripheral surface of the pipe 52. Further, when the joint body 2 is pushed into the pipe 51, the seal member 11 (O-ring) mounted in the groove 10 of the large-diameter connection portion 5 comes into close contact with the inner peripheral surface of the pipe 51, and the large-diameter connection is made. A slight gap existing between the outer peripheral surface of the part 5 and the inner peripheral surface of the pipe 51 is also sealed, and the large-diameter connection part 5 is firmly fixed to the pipe 51.

  When the pipe 51 and the pipe 52 are connected via the joint body 2 as shown in FIG. 6 (c), the clip member 3 is mounted as shown in FIG. 6 (d). More specifically, when the joint body 2 to which the pipe 52 is connected in advance as shown in FIG. 6C is inserted from the opening end of the pipe 51, the knob portion 22 is picked with a finger or the like, so that the large diameter portion 20 The clip member 3 is held by the builder so that the flange 51a faces the pipe 51 side (upper side in FIG. 7) and the small-diameter portion 21 faces the pipe 52 side (lower side in FIG. 7). . Thereafter, when the installer pushes the clip member 3 so that the flange portion 51a of the pipe 51 fits into the gap 25 as indicated by an arrow in FIG. 7, the pipe 51 becomes in a state of being gripped by the large diameter portion 20, The pipe 52 is held by the small diameter portion 21.

  When the clip member 3 is mounted as described above, the flange portion 51a of the pipe 51 is sandwiched between the large diameter portion 20 and the small diameter portion 21 as shown in FIG. 6D and FIG. 3 cannot move in the axial direction of the pipe 51. Further, when the clip member 3 is attached, the small diameter portion 21 of the clip member 3 is arranged at a position along the outer periphery of the pipe 52 as shown in FIG. 23 is in a state of crossing a gap portion (region X) formed between the pipe 51 and the pipe 52. That is, when the clip member 3 is attached, the small diameter portion 21 and the portion connecting the small diameter portion 21 to the knob 22 and the end portion 23 are arranged in the opening region corresponding to the region X.

  Here, as described above, in the region X that is a gap portion formed between the pipe 51 and the pipe 52, the joint body 2 is located until the end of the fastening portion 7 is substantially aligned with the opening end of the pipe 51. It is in the inserted state. Therefore, when the clip member 3 is mounted, the small-diameter portion 21 or the portion connecting from the small-diameter portion 21 to the knob 22 or the end portion 23 is disposed at a position adjacent to the end portion on the fastening portion 7 side of the joint body 2. . Therefore, when the clip member 3 is attached, the joint body 2 cannot be detached from the end of the pipe 51.

  As described above, in the connection joint 1, the fastening pieces 15 of the fastening portions 7 provided in the joint body 2 have flexibility, and the gap between the claw 16 of the fastening pieces 15 and the outer peripheral surface of the small diameter connection portion 6. Is smaller than the wall thickness T of the pipe 52. Further, the outer diameter of the large-diameter connecting portion 5 and the fastening portion 7 of the joint body 2 is substantially the same as the inner diameter of the pipe 51. Therefore, when the pipe 52 is connected to the small diameter connecting portion 6 and the joint body 2 is inserted into the pipe 51, the fastening piece 15 is pushed to the small diameter connecting portion 6 side, and the claw 16 is strongly hooked to the pipe 52. The pipe 52 is firmly fixed to the joint body 2. Therefore, according to the connection joint 1, the pipe 51 and the pipe 52 can be firmly connected only by performing the work of connecting the pipe 52 and the joint body 2 and the work of inserting the joint body 2 into the pipe 51. Can do.

  The connection joint 1 according to the present embodiment includes the clip member 3 in addition to the joint body 2. After connecting the pipe 51 and the pipe 52 through the joint body 2 as described above, the pipe 51 and the pipe are connected. By attaching the clip member 3 to the boundary with 52, the joint body 2 inserted into the pipe 51 can be prevented from coming off.

  In the above embodiment, an example in which the connection joint 1 is constituted by the joint body 2 and the clip member 3 is illustrated, but the connection joint 1 does not have the clip member 3 and may be constituted only by the joint body 2. Good.

  Further, the clip member 3 described above is attached to the pipe 51 so as to be lower than the flange portion 51a of the pipe 51, the small diameter connection portion 6 exists in the opening portion of the pipe 51, and the joint body 2 is connected to the pipe 51. However, the present invention is not limited to this structure, and the structure is such that a portion other than the small diameter connecting portion 6 is located at a position corresponding to the opening portion. The structure which prevents drop-off of the main body 2 may be sufficient.

  As described above, since the entire joint body 2 is accommodated in the pipe 51, the joint body 2 is hardly exposed to outside air or ultraviolet rays. Therefore, in the connection joint 1 of the present embodiment, the joint body 2 is not easily deteriorated. Therefore, according to the above-described configuration, for example, a resin material having a low grade in weather resistance can be adopted as the material of the joint body 2, and the component cost can be suppressed.

  Since the joint body 2 is provided with the claw 16 at the end portion of the fastening piece 15, when the joint body 2 is inserted into the pipe 51, the claw 16 is strongly caught on the surface of the pipe 52 connected to the small diameter connection portion 6. In some cases, it is in a state of being bitten. That is, the fastening portion 7 and the claw 16 enter a gap formed between the pipes 51 and 52 to exhibit a wedge-like function, and prevent the joint body 2 and the pipe 52 from falling off the pipe 51. Yes. Therefore, according to the above configuration, the pipe 52 can be firmly fixed.

  In the said embodiment, although the structure which provided the nail | claw 16 in the terminal part of each fastening piece 15 was illustrated, this invention is not limited to this, Some fastening pieces 15 of the several fastening pieces 15 are provided. Alternatively, the claw 16 may be provided, the claw 16 may be provided in the vicinity of the proximal end portion (end portion on the large diameter connection side) of the fastening piece 15, or may be provided in the intermediate portion of the fastening piece 15.

  Further, the joint body 2 may be configured such that the claw 16 is not provided on the fastening piece 15. In the case of such a configuration, it is desirable that the distance between the inner peripheral surface of the fastening piece 15 and the outer surface of the small-diameter connection portion 6 be smaller than the wall thickness T of the pipe 52. Moreover, when it is set as the structure which does not provide the nail | claw 16, it is desirable to give a slip prevention process to the inner peripheral surface of the fastening piece 15 or the outer peripheral surface of the piping 52, or to make these members with a material with a large frictional resistance.

  As described above, the joint main body 2 is provided so that the claw 16 protrudes from the inner peripheral surface of the fastening piece 15 toward the small diameter connecting portion 6, for example, as illustrated in FIG. Thus, the nail | claw 16 may be shape | molded so that it may become the shape which protruded toward the outer side from the outer periphery of the fastening piece 15. FIG. In such a configuration, when the pipe 52 connected to the small diameter connecting portion 6 is inserted into the pipe 51, the claw 16 is pushed by the inner peripheral surface of the pipe 51 as shown in FIG. 15 is bent along the outer peripheral surface of the pipe 52, and the pipe 52 is firmly fixed.

  Further, the joint body 2 is provided with a plurality of step portions 13 from the distal end portion (the lower end portion in FIG. 3 and the like) to the proximal end side (the upper end side in FIG. 3 and the like) of the small diameter connection portion 6. As shown in FIG. 11A, the step portion 13 may not be provided in the nail facing portion 35 that faces the nail 16. That is, the outer diameter at the position corresponding to the claw facing portion 35 of the small diameter connecting portion 6 is smaller than the outer diameter of the end portion of the small diameter connecting portion 6 (the end portion on the connection side with the pipe 52). It is good also as a structure. In such a configuration, when the pipe 52 connected to the small-diameter connection portion 6 is inserted into the pipe 51, although the degree varies depending on the strength of the pipe 52, as shown in FIG. It deform | transforms so that (upper end part in FIG. 11) may follow the nail | claw opposing part 35 of the small diameter connection part 6. FIG. As a result, as shown in FIG. 11B, the pipe 52 is sandwiched between the pipe 51 and the claw 16 of the fastening piece 15 and the small diameter connecting portion 6, and the deformed portion of the pipe 52 and the stepped portion 13 are caught. Thus, the pipe 52 can be firmly fixed to the pipe 51.

  In the said embodiment, when the coupling main body 2 was inserted in the piping 51, the structure which fits to the terminal part of the fastening part 7 was illustrated, However, This invention is not limited to this, For example, as shown in FIG. May be configured to protrude from the end of the pipe 51. That is, the joint body 2 may be configured so that a part or all of the fastening portion 7 can be accommodated in the pipe 51 in addition to the large diameter connection section 5 in a state where the pipe 52 is connected to the small diameter connection section 6. Is possible. In other words, the fastening part 7 only needs to function as a wedge member that fits into the gap between the pipe 51 and the pipe 52, and a part of the fastening part 7 may protrude outward from the end of the pipe 51. Even in this case, the fastening portion 7 and the claw 16 can function as a wedge as in the above embodiment, and the joint body 2 and the pipe 52 can be prevented from falling off the pipe 51.

  In the said embodiment, although the joint main body 2 was illustrated by integrally molding the fastening part 7 in addition to the large diameter connection part 5 and the small diameter connection part 6, the fastening part 7 was made into the large diameter connection part 5 for example. Further, it may be formed separately from the small-diameter connection portion 6 and integrated with heat welding or an adhesive. In the case of such a configuration, for example, a fastening portion 7 formed by bending a metal thin plate or the like is fixed to a member in which the large-diameter connection portion 5 and the small-diameter connection portion 6 are integrally formed with a resin. it can. With such a configuration, the strength and elastic restoring force of the fastening portion 7 can be further improved, and the size of the joint body 2 in the radial direction can be reduced.

  Similarly, the joint body 2 is formed by, for example, forming one of the large-diameter connection portion 5, the small-diameter connection portion 6, and the fastening portion 7 as a separate body from the other portions, and then integrating them by a technique such as adhesion. It may be a thing. According to such a configuration, the joint body 2 can be configured by combining simple-shaped members, and the manufacturing cost can be suppressed by simplifying the mold for resin molding.

  As described above, the joint body 2 has a configuration in which an O-ring is mounted as the seal member 11 in the groove 10 provided in the large-diameter connection portion 5. For example, the O-ring has a larger elastic deformation amount than the joint body 2. Other members may be fitted into the groove 10. Further, the joint body 2 uses a technique such as a two-color molding method or a different material molding method in place of providing the seal member 11, and the position corresponding to the groove 10 as shown by hatching in FIG. It is good also as a structure which integrally molded using the resin material different from these parts, and provided the part (seal part 30) with a larger elastic deformation amount than another part. According to this configuration, it is possible to save the trouble of mounting the seal member 11 such as an O-ring on the joint body 2 when the pipe 51 and the pipe 52 are connected.

  Moreover, in the said embodiment, although the example which provided the step part 13 in the small diameter connection part 6 from the viewpoint of the ease of insertion of the piping 52 and the drop-off prevention of the piping 52 was illustrated, as shown by hatching in FIG.13 (b), The two-color molding method or the different material forming method is adopted, and the small-diameter connecting portion 6 is provided with a portion having a higher frictional resistance (seal portion 31) than other portions, or the step portion 13 is provided instead of the seal portion. 31 may be provided.

  As described above, when the seal portion 30 or the seal portion 31 is formed on the joint body 2 by the two-color molding method or the different material molding method, the material of the seal portion 30 is nitrile rubber (NBR) or hydrogenated nitrile rubber (HNBR). ), Fluoro rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), chloroprene rubber (CR), acrylic rubber (ACM), butyl rubber (IIR), urethane rubber (U), chlorosulfonated polyethylene (CSM) ), Epichlorohydrin rubber (CO, ECO), natural rubber (NR), etc., and a material having high sealing characteristics such as those employed in so-called O-rings, as well as the large diameter connecting portion 5 and the small diameter connecting portion 6 etc. Parts other than the seal part 30 such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (P C), polystyrene (PS), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polyamide (nylon) (PA) and the like may be selected and integrally molded. it can. According to such a configuration, the pipes 51 and 52 and the joint body 2 can be easily and firmly fixed without mounting the seal member 11 such as an O-ring as in the above embodiment.

  As described above, when the seal portion 30 and the seal portion 31 are provided, it is desirable that the material other than the seal portions 30 and 31 is made of a material having higher hardness than the material of the pipe 52. In addition, in the case where the seal member 10 is mounted on the groove 10 as in the above embodiment, it is desirable that the material of the joint body 2 is higher in hardness than the material of the pipe 52. . In particular, it is desirable that portions of the joint body 2 corresponding to the fastening pieces 15 and the claws 16 have higher hardness than the material of the pipe 52. According to such a configuration, the claw 16 can be firmly engaged with the pipe 52, and the connection strength can be improved.

  In the above embodiment, the joint body 2 has been illustrated as having a shape that extends straight in the vertical direction. For example, the through-hole 8 extends straight from the large-diameter connection portion 5 to the small-diameter connection portion 6. Further, it may be bent in the middle or may have a shape with a changed opening diameter.

It is a perspective view which shows the connection coupling which is one Embodiment of this invention. It is a front view which shows an example of the use condition of the connection coupling shown in FIG. (A) is a front view which shows the coupling main body of the connection coupling shown in FIG. 1, (b) is sectional drawing which shows the coupling main body shown in (a). It is a perspective view which shows the state which observed the connection main body from the reverse direction to the attitude | position shown in FIG. (A) is a front view which shows the clip member which comprises the connection coupling shown in FIG. 1, (b) is a perspective view of the clip member shown in (a). (A)-(d) is sectional drawing which shows typically the procedure which connects a connecting pipe and piping using the connection coupling shown in FIG. 1, respectively. It is a perspective view which shows 1 process of the connection of the connection pipe and piping by the connection coupling shown in FIG. It is a perspective view which shows 1 process of the connection of the connection pipe and piping by the connection coupling shown in FIG. It is a B direction arrow directional view of FIG. (A) is sectional drawing which shows the modification of the coupling main body of this embodiment, (b) is sectional drawing which shows the state which connected piping by the coupling main body shown to (a). (A) is sectional drawing which shows another modification of the coupling main body of this embodiment, (b) is sectional drawing which shows the state which connected piping by the coupling main body shown to (a). It is sectional drawing which shows the modification of a coupling main body. (A) is a front view which shows the modification of the coupling main body shown in FIG. 3, (b) is a front view which shows the state which fractured | ruptured some joint main bodies of the modification of the coupling main body shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection joint 2 Joint main body 3 Clip member 5 Large diameter connection part 6 Small diameter connection part 7 Fastening part 15 Fastening piece 16 Nail | claw 30,31 Seal part 50 Equipment 51 Piping (1st pipe body)
52 Piping (second pipe)

Claims (9)

A connecting joint that connects the first tubular body and a second tubular body having a smaller outer diameter than the first tubular body,
A large-diameter connection portion whose outer peripheral surface is in surface contact with the inner peripheral surface of the first tubular body by being inserted inside the first tubular body;
Continuing to the large-diameter connection portion, by connecting the second tube, the small-diameter connection portion whose outer peripheral surface is in surface contact with the inner peripheral surface of the second tube,
It has a fastening part that extends from the large diameter connection part side toward the small diameter connection part side and has flexibility in the direction of approaching / separating from the small diameter connection part,
A connection joint, wherein the gap between the fastening portion and the small-diameter connection portion becomes narrower than the thickness of the second tube body by being inserted into the first tube body.   2. The connection joint according to claim 1, wherein the fastening portion is partially or entirely fitted into a gap between the inner peripheral surface of the first tubular body and the outer peripheral surface of the second tubular body. By connecting the second tubular body to the small diameter connecting portion, the fastening portion comes into contact with the outer peripheral surface of the second tubular body and bends away from the small diameter connecting portion,
3. The connection joint according to claim 1, wherein the fastening portion is bent and brought into close contact with the second tube body connected to the small-diameter connection portion by being inserted into the first tube body.   The connection part according to any one of claims 1 to 3, wherein the fastening part has a protrusion that protrudes toward the small-diameter connection part.   The connection joint according to any one of claims 1 to 4, wherein the large-diameter connection portion, the small-diameter connection portion, and the fastening portion are integrally formed.   The connection joint according to any one of claims 1 to 4, wherein a connection portion main body having a large-diameter connection portion and a small-diameter connection portion and a fastening portion are integrated.   The seal part is integrally formed on the outer peripheral surface of the large diameter connection part and / or the small diameter connection part, and the seal part is made of a material different from other parts. A connection joint according to any one of the above. It has a joint body with a large-diameter connection part, a small-diameter connection part and a fastening part,
The connection joint according to any one of claims 1 to 7, wherein the entire joint body can be accommodated in the first pipe body. It has a joint body with a large diameter connection part, a small diameter connection part and a fastening part, and a clip member,
The clip member is engaged with the end portion of the first tube body to prevent the first tube body from moving in the axial direction, and the clip member is engaged with the first tube body. The connection joint according to any one of claims 1 to 8, further comprising a transverse portion that traverses an opening region of a gap formed between the tube body and the second tube body.

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