JP5490506B2 - Tube connector - Google Patents

Description

  The present invention relates to a tube connecting fitting used for various pipes such as water supply, hot water supply, and cold / hot water pipes.

  A pipe body made of a resin pipe is connected to a predetermined device or another pipe body via a hollow connection fitting at a required location of various pipes such as water supply, hot water supply, and cold / hot water pipes. There are various types of connection fittings, one of which is a connection fitting having a plurality of annular protrusions on the outer periphery, so-called bamboo shoot grooves.

  Such a connection fitting having a plurality of annular protrusions is required to have a sealing effect as well as a tubular body retaining effect, and a corresponding position where a sealing O-ring is fitted on the outer periphery and a sealing O-ring exists. The tube is firmly fixed from the outside of the tube with a fastening band or the like (see Patent Document 1).

JP 2008-95765 A

  In the state where the tube is fixed to the connection fitting as described above, the inner surface of the tube body is pressed against the sealing O-ring by tightening the tightening band, and the inner surface of the tube body is pressed against the top of the bamboo shoot groove. There must be.

  However, since the tube fixed to the tube connection fitting as described above is opaque, the fastening band may not necessarily be disposed at a position corresponding to the sealing O-ring. In order to avoid such a situation, the width of the tightening band may be made as wide as possible, but the operability becomes worse as the width of the tightening band becomes wider.

  The present invention has been made in view of such a technical background, and even if the position of the tightening band is slightly deviated from the intended position, the sealing effect of the sealing O-ring and the retaining effect by the bamboo shoot groove are ensured. An object of the present invention is to provide a tube fitting that can be exhibited.

  In order to achieve the above object, the tube fitting of the present invention has the following configurations [1] to [4].

[1] A cylindrical body having both ends open and having a flange portion at one end, and a plurality of annular protrusions are arranged at predetermined intervals in the length direction of the outer periphery, and each of the annular protrusions is a tube body. The annular surface has an inclined surface that is reduced in diameter toward the insertion side and a vertical wall surface that extends from the top to the axial center of the cylinder, and the annular low portion is positioned lower than the top between adjacent annular protrusions. The first sealing O-ring that is in a face-to-face state is fitted to the vertical wall surface of the protrusion, while the annular protrusion between the adjacent adjacent annular protrusions or between the annular protrusion and the flange portion. A second sealing O-ring that is in a face-to-face state with respect to the vertical wall surface of the annular protrusion is fitted to the annular lower portion located at a position lower than the top,
The pitch between the first sealing O-ring and the second sealing O-ring and the interval between adjacent annular protrusions are set to be smaller than the width of the fastening band fitted on the outer periphery of the tube body. The tube connecting bracket.

  [2] The tubular body fitting according to item 1 above, wherein the annular low portion has a cylindrical surface, and a sealing O-ring is fitted in the annular recess of the cylindrical surface.

  [3] The tubular body fitting according to the above item 2, wherein the annular low portion includes an inclined surface that is continuous with the cylindrical surface and is reduced in diameter toward the insertion side of the tubular body.

  [4] The tube fitting according to any one of items 1 to 3, wherein the height of the sealing O-ring is set to be slightly lower than the top of the annular protrusion.

  The present invention has the following effects.

  In the invention of [1], a first sealing O-ring that faces the vertical wall surface of the annular protrusion is fitted in an annular low position that is lower than the top between adjacent annular protrusions. On the other hand, it faces the vertical wall surface of the annular protrusion at an annular low position that is lower than the top of the annular protrusion between other adjacent annular protrusions or between the annular protrusion and the flange portion. The second sealing O-ring to be in a state is fitted, and the pitch between the first sealing O-ring and the second sealing O-ring and the pitch of the adjacent annular protrusions are fitted to the outer periphery of the tube body Since it is set to be smaller than the width of the band, when the fastening band is fitted to the outer surface of the tubular body at the corresponding position of the first sealing O-ring or the second sealing O-ring with the approximate register, it is tightened. Make sure that one of the sealing O-rings and at least one annular protrusion are tightened. It will enter the only band in the region.

  Therefore, the inner surface of the tubular body is pressed against the first sealing O-ring or the second sealing O-ring by the tightening force of the tightening band, and is also pressed into a mode in which it is appropriately hooked on the top of the annular protrusion, The sealing effect by the sealing O-ring and the retaining effect by the annular protrusion are reliably exhibited.

  Moreover, since the allowable range of the tightening position of the tightening band is wide, the positioning operation is easy and the operability is excellent.

  Further, the fastening band can be positioned at a position where both the first sealing O-ring and the second sealing O-ring are pressed against each other. In this case, a double sealing effect can be exhibited.

  In the invention of [2], the annular low portion has a cylindrical surface, and the sealing O-ring is fitted in the annular concave portion of the cylindrical surface, so that the fitting property of the sealing O-ring is good and stable. A sealing effect can be obtained.

  In the invention of [3], since the annular low portion is provided with an inclined surface that is continuous with the cylindrical surface and reduces the diameter toward the tube insertion side, the height of the annular projection vertical wall surface is relatively high. As a result, the amount of catching of the annular protrusion on the tube increases, and a further retaining effect is exhibited.

  In the invention of [4], since the height position of the sealing O-ring is set to be slightly lower than the top of the annular protrusion, the tube pressed against the sealing O-ring by the fastening band The inner surface of the body is easily caught by the top of the annular protrusion corresponding to the sealing O-ring, and the effect of preventing the tubular body from coming off is further exhibited.

(A) is a side view of the tube body fitting according to the first embodiment of the present invention, and (B) is a cross-sectional view taken along line AA of FIG. It is a partial cross section side view of the state which fixed the pipe body to the pipe body connecting metal fitting of the embodiment, and connected with the pipe body by the side of an apparatus. (A)-(d) is explanatory drawing which shows the fastening position of the fastening band in the tube body metal fitting of the embodiment. (A) is a side view of the tube body fitting according to the second embodiment of the present invention, and (B) is a cross-sectional view taken along line AA of FIG. (A) is a side view of a tube fitting according to a third embodiment of the present invention, and (B) is a cross-sectional view taken along line AA of FIG.

  An embodiment of a tube connection fitting according to the present invention will be specifically described with reference to the drawings.

  As shown in FIG. 2, the connection fitting K1 of this embodiment includes a so-called bamboo shoot groove portion 1 and a flange portion 3 having a plurality of annular protrusions on the outer periphery of a hollow cylindrical body having both ends opened as shown in FIG. In addition, it is used as a pipe joint set with a nut 5 having a through hole smaller in diameter than the outer diameter of the flange portion 3.

  In the tubular body fitting K1 of the first embodiment, the first to fourth four annular protrusions 11, 12, 13, and 14 from the insertion side of the resin tubular body P1 are arranged in the longitudinal direction of the outer periphery of the tubular body. Are arranged at predetermined intervals. Between each of the first to fourth annular protrusions and the annular protrusions adjacent to each other, annular low places 21, 22 and 23 are provided, while between the fourth annular part 14 and the flange part 3. An annular low point 24 is also provided.

  An annular low portion 22 between the second annular projection 12 and the third annular projection 13 is a cylindrical surface 22a and an inclined surface 22b that is continuous with the cylindrical surface 22a and decreases in diameter toward the insertion side of the resin tubular body P1. The first sealing O-ring 7 made of an elastic body is fitted into an annular recess 22c provided in the cylindrical surface 22a.

  The upper half of the first sealing O-ring 7 fitted in the annular recess 22 c protrudes from the annular recess 22 c and faces the vertical wall surface 12 c of the second annular protrusion 12. The height position of the sealing O-ring 7 is set to be slightly lower than the top portion 12 b of the annular protrusion 12.

  An annular low portion 24 between the fourth annular protrusion 14 and the flange portion 3 includes a cylindrical surface 24a and an inclined surface 24b that is continuous with the cylindrical surface 24a and decreases in diameter toward the insertion side of the tubular body P1. A second sealing O-ring 8 made of an elastic body is fitted into an annular recess 24c provided on the cylindrical surface 24a.

  The upper half portion of the second sealing O-ring 8 fitted in the annular recess 24 c protrudes from the annular recess 24 c and faces the vertical wall surface 14 c of the fourth annular protrusion 14. The height position of the second sealing O-ring 8 is set to be slightly lower than the top portion 14 b of the annular protrusion 14.

  Further, the pitch L1 between the first sealing O-ring 7 and the second sealing O-ring 8 and the pitch L2 between the annular projections adjacent to the first to fourth annular projections are smaller than the width L3 of the fastening band 30. Is set to

  Thus, after the tube connection fitting K1 having the above-described configuration is inserted into the tube P1 using an attachment jig or the like, the fastening band 30 is moved to the corresponding position of the first sealing O-ring or the second sealing O-ring. The tube body P1 is firmly fixed to the tube body fitting K1 by the tightening force of the tightening band 30.

  FIG. 2 shows a state in which the pipe connection fitting K1 is combined with the nut 5, the pipe P1 is fixed to the pipe connection fitting K1, and is connected to the equipment-side pipe P2 via the nut 5. Thus, the first sealing O-ring 7 and the second sealing O-ring 8 exist in the region of the tightening position of the tightening band 30.

  Further, the third annular protrusion 13 and the fourth annular protrusion 14 exist in the region of the tightening band 30, and the inner surface of the tubular body P <b> 1 is sealed with the first sealing O-ring by the tightening force of the tightening band 30. Alternatively, the O-ring for sealing is not only pressed against the second sealing O-ring, but also pressed in a mode that is appropriately hooked on the top portions 13b and 14b of the third annular protrusion 13 and the fourth annular protrusion 14, respectively. The sealing effect by 7 and 8 and the retaining effect by the annular protrusions 11, 12, 13, and 14 are exhibited.

  In addition, since the first and second sealing O-rings 7 and 8 exist in the region of the fastening band 30, a double sealing effect can be obtained.

  2 is ideal for the tightening position of the tightening band 30, but the tightening band 30 is not such a position and may be slightly deviated from the ideal position as illustrated in FIG. Any one of the first sealing O-ring and the second sealing O-ring and any one of the first to fourth annular protrusions are present in the region of the fastening band 30, Effect.

  In the region of the fastening band 30 in FIGS. 3A and 3B, the second sealing O-ring 8, the third annular protrusion 13 and the fourth annular protrusion 14 exist.

  In the region of the fastening band 30 in FIG. 3C, the first sealing O-ring 7, the third annular protrusion 13, and the fourth annular protrusion 14 are present.

  In the region of the fastening band 30 in FIG. 3D, the first sealing O-ring 7, the first annular protrusion 11 and the second annular protrusion 12 are present.

  As described above, when the fastening band 30 is fitted to the outer periphery of the tubular body P1 at the corresponding position of the first sealing O-ring 7 and the second sealing O-ring 8 with the approximate register, Since one or more of the sealing O-rings 7 and 8 and the first to fourth annular protrusions 11, 12, 13, and 14 enter the region of the fastening band 30, The allowable range of the tightening position is widened and the operability is excellent.

  Further, since the sealing O-rings 7 and 8 are fitted into the annular recesses 22c and 24c of the annular low cylindrical surfaces 22a and 24a, the fitting property is good and a stable seal at any tightening position. An effect is obtained.

  Further, each of the annular low portions 22 and 24 includes inclined surfaces 22b and 24b that are connected to the cylindrical surfaces 22a and 24a and have a diameter reduced toward the insertion side of the tube P1, so that the annular protrusion vertical wall surface 12c, The height of 14c becomes relatively high, the amount of catching of the annular protrusions 12 and 14 with respect to the tubular body P1 increases, and a further retaining effect is exhibited.

  In addition, since the height of the sealing O-rings 7 and 8 is set to be slightly lower than the tops 12b and 14c of the annular protrusions 12 and 14, the sealing band 30 is sealed. The inner surface of the tubular body pressed against the O-rings 7 and 8 is easily caught on the tops of the annular protrusions 12 and 14 facing the sealing O-rings 7 and 8, and exhibits an effect of preventing the tubular body P 1 from coming off.

  FIG. 4 shows a tube connection fitting A2 of the second embodiment according to the present invention, and FIG. 5 shows a tube connection fitting A3 of the third embodiment. The difference from the first embodiment is that a sealing O-ring is used. 7 and 8 and the annular protrusions 11, 12, 13, and 14 are arranged, and the operation of each part is not fundamentally different from that of the first embodiment, so the same parts will be described using the same reference numerals. .

  In the tube connection fitting K2 of the second embodiment shown in FIG. 4, the first sealing O-ring 7 is fitted in the annular low portion 22 between the second annular protrusion 11 and the third annular protrusion 13. However, unlike the first embodiment, the second sealing O-ring 8 has an annular low portion between the third annular protrusion 13 and the fourth annular protrusion 14. It is inserted into the place 23.

  Each of the annular low portions 22 and 23 has cylindrical surfaces 22a and 23a, and the first sealing O-ring 7 or the second sealing O-ring 8 is fitted into the annular recesses 22c and 23c of the cylindrical surface. In addition, each of the annular low portions 22 and 23 includes inclined surfaces 22c and 23c that are connected to the cylindrical surfaces 22a and 23a and reduce in diameter toward the tube insertion side. This is the same as the body connection fitting K1.

  In the tube connection fitting K3 of the third embodiment shown in FIG. 5, the first sealing O-ring 7 is provided in the annular low place 21 between the first annular protrusion 11 and the second annular protrusion 12. A sealing O-ring 8 is fitted in an annular low portion 23 between the third annular protrusion 13 and the fourth annular protrusion 14.

  Each of the annular low portions 21 and 23 has cylindrical surfaces 21a and 23a, and the first sealing O-ring 7 or the second sealing O-ring 8 is fitted into the annular recesses 21c and 23c of the cylindrical surfaces. In addition, each of the annular low portions 21 and 23 includes the inclined surfaces 21c and 23c that are connected to the cylindrical surfaces 21a and 23a and reduce the diameter toward the tube insertion side. This is the same as the body connection fitting K1.

  Further, in both of the tube connection fitting K2 of the second embodiment and the tube connection fitting K3 of the third embodiment, the first sealing O-ring 7 and the second sealing O-ring 8 are the same as in the first embodiment. Is fitted in a face-to-face state with an interval with respect to the vertical wall surfaces 11c, 12c, 13c of the annular protrusions 11, 12, 13 and the height positions thereof are the top parts 11b, 12b, 13b of the annular protrusions. Since it is set to be slightly lower, an effect equivalent to that of the tube fitting K1 of the first embodiment is exhibited.

  Note that the pipe connection fittings of the above embodiment are all used in combination with nuts, but the pipe connection fittings of the present invention are not limited to those used in combination with such nuts, The device-side tube body may be screwed into a male thread portion projecting as a flange portion at one end of the body, and they may be integrally formed.

  In addition, the number of the annular protrusions is four in the embodiment, but at least one annular protrusion having a vertical wall surface facing at least the first intimate O-ring and the second intimate O-ring. It is enough.

  Furthermore, the number of close O-rings is not limited to two, and three or more close O-rings may be provided.

  In the above embodiment, the height position of the close O-ring is set to be slightly lower than the top of the annular protrusion even in the non-pressure contact state with the inner surface of the tubular body. If the intimate O-ring compressed in the pressure contact state is lower than the top of the annular protrusion, it will be equal to or higher than the top of the annular protrusion in the non-pressure contact state with the tube inner surface. It does not matter.

K1 to K3 ... Tube connecting bracket 1 ... Bamboo groove part 3 ... Flange part 5 ... Nut 7 ... First sealing O-ring 8 ... Second sealing O-ring 11-14 ... Rolling protrusions 11a to 14a ... Rolling surfaces 11b to 14b of the annular protrusions ... Top parts 11c to 14c of the annular protrusions ... Vertical wall surfaces 21 to 24 of the annular protrusions ... 22a, 24a ... annular low cylindrical surface 22b, 24b ... annular low inclined surface 22c, 24c ... annular low recess 30 ... tightening band

Claims (4)

A cylindrical body having both ends open and a flange portion at one end, and a plurality of annular protrusions are arranged at predetermined intervals in the length direction of the outer periphery, and each of the annular protrusions is arranged on the tube insertion side. An inclined surface that decreases in diameter, and a vertical wall surface that extends from the top to the axis of the cylinder,
While the first sealing O-ring that is in a face-to-face state with respect to the vertical wall surface of the annular protrusion is fitted to the annular low portion that is lower than the top between the adjacent annular protrusions,
Between the other adjacent annular projections or between the annular projection and the flange portion, the annular low portion located at a lower position than the top of the annular projection is opposed to the vertical wall surface of the annular projection. A second sealing O-ring is fitted,
The pitch of the first sealing O-ring and the second sealing O-ring and the pitch of the adjacent annular protrusions are set to be smaller than the width of the fastening band to be fitted to the outer periphery of the tubular body ,
The first sealing O-ring, the second sealing O-ring, and the annular protrusion are provided, and an allowable range of a tightening position where the tightening band can be tightened is set wider than a width of the tightening band . This is a tube fitting.   The tube connection fitting according to claim 1, wherein the annular low portion includes a cylindrical surface, and a sealing O-ring is fitted in an annular recess of the cylindrical surface.   The tube connection fitting according to claim 2, wherein the annular low portion includes an inclined surface that is continuous with the cylindrical surface and is reduced in diameter toward the tube insertion side.   The tube connector according to any one of claims 1 to 3, wherein a height position of the sealing O-ring is set to be slightly lower than a top portion of the annular protrusion.

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