JP2007285469A - Pipe connecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensively processible-moldable pipe connecting device with a simple structure. <P>SOLUTION: A joint body 12 is fitted to an outer peripheral surface of pipe bodies 21 and 22 as a tubular body 11. Annular seal holding members 13 are respectively fitted to an outer peripheral surface of the pipe bodies 21 and 22 so as to be opposed to one end surface and the other end surface of this joint body 12. Annular seal fitting grooves 14 are respectively arranged on the inner diameter side of opposed surfaces of the respective seal holding members 13 opposed to the joint body 12, and an annular seal member 15 is respectively fitted to these seal fitting grooves 14. The joint body 12 and the respective seal holding members 13 are fixed in the direction interposingly pressing the annular seal member 15 by a fixing means 16. A groove width in the pipe axis direction of the seal fitting grooves 14 is set smaller than the thickness in the pipe axis direction of the seal member 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe connection device for connecting a plurality of tubular bodies.

Conventionally, circumferential grooves are respectively provided on the outer circumferential sides of two linearly arranged hydraulic pipes, and annular projections of the seal ring are respectively engaged with these circumferential circumferential grooves, and on the outer circumferential side of these sealing rings. The sleeve and the retainer are respectively fitted, and a half-clamped clamp ring is attached to the outer peripheral side of each of the sleeve and the retainer, and each seal ring is attached to the outer periphery of each hydraulic pipe via each sleeve and the retainer by these clamp rings. A pipe connection device is known that is tightened to the side and connects each hydraulic pipe (see, for example, Patent Document 1).
JP 2002-349777 A (page 4, FIG. 7)

  However, the above-described pipe connection device requires a seal ring, a sleeve, a retainer, and a clamp ring having complicated shapes, and there is a problem that these are difficult to process and expensive.

  The present invention has been made in view of these points, and an object of the present invention is to provide a pipe connection device that has a simple structure and can be processed and formed at low cost.

  The invention according to claim 1 includes a joint main body fitted to the outer peripheral surface of the tubular body, an annular seal holding member fitted to the outer peripheral surface of the tubular body facing the end face of the joint main body, and a seal holding member And an annular seal fitting groove provided on the inner diameter side of at least one of the opposing surfaces of the joint body, an annular seal member fitted in the seal fitting groove, and the joint body and the seal holding member It is the piping connection apparatus which comprised the fixing means which fixes a member in the direction clamped.

  According to a second aspect of the present invention, the tubular body in the pipe connection device according to the first aspect is provided so that the first tubular body and the second tubular body are opposed to each other, and the joint body includes the first tubular body and the first tubular body. The seal holding member and the seal member are respectively provided to the one end surface and the other end surface of the joint body.

  In the invention according to claim 3, the groove width in the tube axis direction of the seal fitting groove in the pipe connection device according to claim 1 or 2 is set smaller than the wall thickness in the tube axis direction of the seal member. .

  According to a fourth aspect of the present invention, there is provided a through hole portion in which the fixing means in the pipe connecting device according to the second or third aspect is formed by penetrating through the joint main body and a seal holding member disposed opposite to both end faces thereof. And a bolt inserted into the through hole, and a nut that is screwed into the bolt to fasten the joint body and the seal holding members on both end faces thereof.

  According to a fifth aspect of the present invention, in the pipe connection device according to any one of the second to fourth aspects, the opposing end portions of the first tubular body and the second tubular body are provided with concave and convex portions that are fitted to each other. It is a thing.

  According to the first aspect of the present invention, the annular seal fitting groove provided on the inner diameter side of at least one of the opposing surfaces of the joint body fitted to the outer peripheral surface of the tubular body and the annular seal holding member is annular. By fixing these seal members and clamping them with a fixing means, fixing and sealing can be performed simultaneously, so that it is possible to provide a pipe connection device that has a simple structure and can be processed and formed at low cost.

  According to the second aspect of the present invention, the first tubular body is formed by an inexpensive joint structure including a joint main body, and a seal holding member and a seal member provided for the one end face and the other end face, respectively. The second tube can be easily connected.

  According to the third aspect of the present invention, the groove width in the tube axis direction of the seal fitting groove provided on the inner diameter side of at least one of the opposing surfaces of the seal holding member and the joint body is set to the thickness of the seal member in the tube axis direction. Since the thickness is set to be smaller than the thickness, the sealing member is elastically deformed toward the inner diameter side by the clamping pressure of the fixing means and is brought into close contact with the tubular body, thereby ensuring the sealing performance.

  According to the fourth aspect of the present invention, an inexpensive and reliable fixing means can be obtained by the bolt inserted into the through hole of the seal holding member on both ends of the joint body and the nut screwed with the bolt.

  According to the fifth aspect of the present invention, the concavo-convex portions of the opposing ends of the first tubular body and the second tubular body are fitted to each other so that the tubular bodies are continuous, integrated, and stabilized. Can be achieved.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 4, another embodiment shown in FIG. 5, and still another embodiment shown in FIG. 6. explain.

  FIG. 1 shows a pipe connecting device 10, in which a joint body 12 is fitted on the outer peripheral surface of a tubular body 11, and an annular seal is formed on the outer peripheral surface of the tubular body 11 so as to face one end surface and the other end surface of the joint body 12. Each holding member 13 is fitted, and an annular seal fitting groove 14 is provided on the inner diameter side of the opposing surface of each seal holding member 13 facing the joint body 12, and an annular seal is provided in each seal fitting groove 14. Each of the members 15 is fitted, and the joint main body 12 and each seal holding member 13 are fixed by the fixing means 16 in a direction in which the annular seal member 15 is clamped. The seal member 15 is an O-ring made of an elastic member such as synthetic rubber.

  The tubular body 11 is provided with a first tubular body 21 and a second tubular body 22 facing each other, and the joint body 12 is fitted to the first tubular body 21 and the second tubular body 22. The seal holding member 13, the seal fitting groove 14, and the seal member 15 are provided on one end surface and the other end surface of the joint body 12, respectively. The first tubular body 21 and the second tubular body 22 are elongated cylindrical metal pipes each having an annular cross section with the same inner diameter dimension and outer diameter dimension.

  Further, the end portion 23 of the first tubular body 21 is cut into the first tubular body 21 flatly along the radial direction perpendicular to the axial direction of the first tubular body 21, so that the connecting surface 28. Is formed. Further, the inner edge of the connecting surface 28 of the first tubular body 21 is provided with an inner portion having a stepped section as one uneven portion penetrating each of the inner peripheral surface 29 and the connecting surface 28 of the first tubular body 21. A circumferential step portion 31 is provided. The one inner peripheral step 31 is constituted by a locking surface 32 along the axial direction of the first tubular body 21 and an abutting surface 33 along the radial direction of the first tubular body 21. ing. The locking surface 32 is formed in an arc shape in a side view along the circumferential direction of the first tubular body 21, and is formed as a flat surface orthogonal to the contact surface 33. Further, the contact surface 33 is formed in an arc shape in plan view along the radial direction of the first tubular body 21.

  Further, the end portion 26 of the second tubular body 22 is cut flat in the second tubular body 22 along the radial direction perpendicular to the axial direction of the second tubular body 22 to form a connecting surface 35. Is formed. The outer periphery of the connecting surface 35 of the second tubular body 22 has an outer peripheral step with a stepped section as the other concavo-convex portion penetrating each of the outer peripheral surface 27 and the connecting surface 35 of the second tubular body 22. A portion 37 is provided. The outer peripheral step portion 37 is constituted by a locking surface 38 along the axial direction of the second tubular body 22 and a contact surface 39 along the radial direction of the second tubular body 22. The locking surface 38 is formed in an arc shape in a side view along the circumferential direction of the second tubular body 22, and is formed as a flat surface orthogonal to the contact surface 39. The contact surface 39 is formed in a circular arc shape in plan view along the radial direction of the second tubular body 22.

  Therefore, the outer peripheral step portion 37 constituted by the locking surface 38 and the contact surface 39 makes contact with the connection surface 28 of the first tubular body 21 facing the connection surface 35 of the second tubular body 22. In this state, the first tubular body 21 is fitted and locked to one inner circumferential step portion 31 of the first tubular body 21. At this time, the one inner peripheral step portion 31 is engaged with the engaging surface 32 of the one inner peripheral step portion 31 so that the engaging surface 38 of the outer peripheral step portion 37 comes into contact therewith. The abutment surface 39 of the outer peripheral step portion 37 is abutted and locked to the abutment surface 33 of the peripheral step portion 31, and the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 are Are connected coaxially.

  The joint body 12 is a cylindrical metal collar so that the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 can be inserted from both end portions 42 and 43 in the axial direction. In addition, the first tube body 21 and the second tube body 22 have inner diameter dimensions equal to the outer diameter dimensions. The joint body 12 has a planar shape in which one end surface 44 located on one end side in the axial direction and the other end face 45 located on the other end side in the axial direction are orthogonal to the axial direction of the joint body 12. Is formed.

  Further, a bolt insertion hole 46 as a through hole portion penetrating in the axial direction from one end surface 44 to the other end surface 45 of the joint body 12 is formed in the peripheral surface portion of the joint body 12. A plurality of, for example, four bolt insertion holes 46 are provided on one end face 44 of the joint body 12 at regular intervals along the circumferential direction of the one end face 44. Further, these bolt insertion holes 46 are provided along the axial direction of the joint body 12 at positions near the outer edges of the one end face 44 and the other end face 45 of the joint body 12.

  The seal holding member 13 is attached to each of the one end surface 44 and the other end surface 45 of the joint body 12. The seal holding members 13 are made of metal and have a cylindrical shape having an inner diameter dimension equal to the inner diameter dimension of the joint body 12 and an outer diameter dimension equal to the outer diameter dimension of the joint body 12. Further, the seal holding member 13 has an inner side surface 52 which is one end portion in the axial direction and an outer side surface 53 which is the other end portion in the axial direction, each having a planar shape perpendicular to the axial direction of the seal holding member 13. Is formed.

  Further, the inner edge of the inner side surface 52 of the seal holding member 13 is provided with a concave seal fitting groove 14 penetrating the inner side surface 52 and the inner peripheral surface 54 of the seal holding member 13. The seal fitting groove 14 includes a first pressing surface 56 along the axial direction of the seal holding member 13 and a second pressing surface 57 along the radial direction of the seal holding member 13. The first pressing surface 56 is formed in an arc shape in a side view along the circumferential direction of the seal holding member 13, and is formed as a flat surface orthogonal to the second pressing surface 57. The second pressing surface 57 is formed in an arc shape in plan view along the radial direction of the seal holding member 13.

  Further, at a position closer to the outer periphery than the seal fitting groove 14 of the seal holding member 13, a bolt as a through-hole portion penetrating along the axial direction from the inner side surface 52 to the outer side surface 53 of the seal holding member 13 An insertion hole 58 is formed. These bolt insertion holes 58 are in a state where the inner side surface 52 of the seal holding member 13 is coaxially connected to and opposed to the one end surface 44 or the other end surface 45 of the joint body 12, and the bolt insertion holes 46 of the joint body 12 are opposed to each other. In order to communicate with each other, a plurality, for example, four of them are provided at equal intervals along the circumferential direction of each of the inner side surface 52 and the outer side surface 53 of the seal holding member 13.

  An annular seal member 15 having elasticity such as an O-ring is fitted and held in the seal fitting groove 14 of the seal holding member 13 in the circumferential direction. As shown in FIG. 3, the seal member 15 has an annular shape having an outer diameter d equal to the inner diameter c of the first pressing surface 56 of the seal holding member 13, and the second of the seal holding member 13. The pressing surface 57 is formed in a circular cross section having a diameter dimension e equal to the width dimension a. Therefore, the seal member 15 has a diameter dimension e which is a width dimension larger than the width dimension b of the first pressing surface 56 of the seal holding member 13. In other words, the groove width in the tube axis direction of the seal fitting groove 14 (that is, the width dimension b of the pressing surface 56) is set smaller than the thickness of the seal member 15 in the tube axis direction (that is, the diameter dimension e). .

  Further, each of the bolt insertion holes 58 of the seal holding member 13 is connected to the joint while the inner side surface 52 of the seal holding member 13 is opposed to the one end surface 44 and the other end surface 45 of the joint body 12 so as to face each other. In a state of communicating with each of the bolt insertion holes 46 of the main body 12, the bolt insertion hole 58 and the bolt insertion hole 46 communicated with the socket bolt 62 as a bolt from the outer surface 53 side of one seal holding member 13. A screw part 63 as a shaft part is inserted, and the tip part of the screw part 63 of these socket bolts 62 projects outward from the outer surface 53 of the other seal holding member 13, and the screw part 63 of these socket bolts 62 A fixing nut 64 as a nut is screwed to the tip of the joint body 12, and the joint body 12 is fastened and fixed between the pair of seal holding members 13. Here, the socket bolt 62 has an elongated rod-like screw part 63 in which a thread groove is threaded on the outer peripheral surface, and a hexagonal shape in a plan view is formed at a base end part which is one end side in the axial direction of the screw part 63. The bolt head 65 is integrally provided coaxially.

  The fixing nut 64 is formed in a hexagonal shape in plan view equivalent to the bolt head 65 of the socket bolt 62, and a screw hole in which a thread groove is threaded on the inner peripheral surface is formed at the center of the fixing nut 64. 66 is drilled. The screw hole 66 is formed so as to be able to be screwed into the threaded portion 63 of the socket bolt 62, and is screwed into a tip portion which is the other end portion in the axial direction of the threaded portion 63 of the socket bolt 62, thereby coupling. The seal holding member 13 attached to both end portions 42 and 43 of the main body 12 is fastened and fixed, and the seal member 15 held in the seal fitting groove 14 of the seal holding member 13 2 is pressed by the pressing surface 57, and the seal member 15 is elastically deformed so as to protrude inward from the inner peripheral surface 47 of the seal holding member 13 and the joint body 12, and the outer peripheral surface of the seal member 15 is The first tube body 21 or the second tube body is brought into close contact with the outer peripheral surface of the first tube body 21 or the second tube body 22 inserted into the joint body 12 through the seal holding member 13. 22 is connected airtight over the circumferential direction.

  Here, the socket bolt 62, the fixing nut 64, the bolt insertion hole 46 of the joint main body 12, and the bolt insertion hole 58 of each seal holding member 13, respectively, connect these seal holding members 13 to both end portions 42, A fixing means 16 for fastening and fixing to 43 is configured. The fixing means 16 is configured so that the seal member 15 is fitted and held in the seal fitting groove 14 of the seal holding member 13 while the inner side surface 52 of the seal holding member 13 is opposed to both end surfaces 44 and 45 of the joint body 12. This is a tightening mechanism for tightening and fixing these seal holding members 13 to both end faces 44 and 45 of the joint main body 12 in a contact state.

  Therefore, the fixing means 16 presses the seal member 15 fitted and held in the seal fitting groove 14 of each seal holding member 13 with the second pressing surface 57 of each seal holding member 13 so that these seals By holding the holding member 13 by the first pressing surface 56, the outer peripheral edge of each seal member 15 is elastically deformed so as to protrude inward from the inner peripheral surface 54 of the seal holding member 13. Therefore, the fixing means 16 is brought into contact with the outer peripheral surface 24 of the first tubular body 21 or the outer peripheral surface 27 of the second tubular body 22 inserted into both end portions 44 and 45 of the joint body 12, The end 23 of the first tube 21 and the end 26 of the second tube 22 are connected in an air-tight and liquid-tight manner.

  Next, the operation and effect of the pipe connection device 10 of the embodiment shown in FIGS. 1 to 4 will be described.

  First, the seal member 15 is fitted and held in each of the seal fitting grooves 14 of the pair of seal holding members 13.

  In this state, the inner side surface 52 of one seal holding member 13 faces the one end surface 44 of the joint body 12 so as to be coaxially contacted and communicated with each other, and the other seal surface is held on the other end surface 45 of the joint body 12 The inner side surfaces 52 of the member 13 are opposed to each other and contacted coaxially to communicate with each other.

  Thereafter, the end portion 23 of the first tubular body 21 is inserted into the seal holding member 13 from the outer surface 53 side of one seal holding member 13, and the end portion 26 of the second tubular body 22 is inserted. Then, the other seal holding member 13 is inserted into the seal holding member 13 from the outer surface 53 side.

  At this time, the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 are brought into contact with each other at an intermediate portion in the axial direction in the joint body 12, so that the first tubular body 21 is brought into contact. The outer peripheral step portion 37 of the second tubular body 22 is fitted to one inner peripheral step portion 31 of the first tubular body 22 so that the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 are connected to each other. Connect coaxially.

  In this state, the seal holding members 13 are rotated in the circumferential direction so that the bolt insertion holes 58 of the seal holding members 13 communicate with the bolt insertion holes 46 of the joint main body 12, respectively.

  Thereafter, the threaded portion 63 of the socket bolt 62 is inserted into each of the bolt insertion holes 58 of the seal holding member 13 from the outer surface 53 side of the one seal holding member 13.

  At this time, the threaded portion 63 of the socket bolt 62 is inserted into the bolt insertion hole 46 of the joint body 12 via the bolt insertion hole 58 of one seal holding member 13 and the bolt insertion hole 58 of the other seal holding member 13 is inserted. And the tip of the threaded portion 63 of each of the socket bolts 62 is projected outward from the outer side surface 53 of the other seal holding member 13.

  In this state, a fixing nut 64 is screwed onto the tip of the threaded portion 63 of each socket bolt 62 protruding from the bolt insertion hole 58 toward the outer side of the outer surface 53 of the other seal holding member 13, and these The joint body 12 between the pair of seal holding members 13 is fastened and fixed along the axial direction by the fixing nut 64.

  At this time, when the joint body 12 is tightened by the pair of seal holding members 13, the seal members 15 fitted and held in the seal fitting grooves 14 of the seal holding members 13 are the second of the seal holding members 13. The first pressing surface 56 of the seal holding member 13 and the outer circumference of the first tube body 21 or the second tube body 22 are pressed while being sandwiched between the pressing surface 57 and the one end surface 44 or the other end surface 45 of the joint body 12. Since the seal members 15 are held by the surfaces 24 and 27, the seal members 15 are elastically deformed and swell so that the outer peripheral surfaces of the seal members 15 are the outer periphery of the first tube body 21 or the second tube body 22. It is in close contact with the surfaces 24 and 27.

  Therefore, as shown in FIG. 4, when a part of the seal member 15 is in close contact with the outer peripheral surfaces 24 and 27 of the first tube body 21 or the second tube body 22, a joint between the seal holding members 13 is obtained. A close contact portion 68 which is an elastically deformed part of the seal member 15 is in contact with the outer peripheral surfaces 24 and 27 of the first tube body 21 or the second tube body 22 inserted into the main body 12 in the circumferential direction. The end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 are connected in an air-tight and liquid-tight manner.

  As described above, according to the above embodiment, the annular body provided on the inner diameter side of at least one of the opposing surfaces of the joint body 12 and the annular seal holding member 13 fitted to the outer peripheral surface of the tubular body 11 is provided. Since the annular seal member 15 is fitted in the seal fitting groove 14 and these are clamped by the fixing means 16, the fixing and the sealing can be performed simultaneously. 10 can be offered. Further, the first tubular body 21 and the second tubular body 11 constituting the tubular body 11 are constituted by an inexpensive joint structure constituted by a seal holding member and a seal member used in pairs with respect to the one end surface and the other end surface of the joint body. The tube body 22 can be easily connected.

  That is, a pair of annular seal holding members 13 are attached to both end portions 42 and 43 of the cylindrical joint body 12 of the pipe connecting device 10, and are fitted and held in the seal fitting grooves 14 of the pair of seal holding members 13. The cross-sections of the seal members 15 are larger than the width dimension b of the first pressing surface 56 along the axial direction of the seal fitting grooves 14 of these seal holding members 13, and the seal fitting grooves 14 of these seal holding members 13 are arranged. Since the diameter dimension e is equal to the width dimension a of the second pressing surface 57 along the radial direction, in other words, the groove width in the tube axis direction of the seal fitting groove 14 (the width dimension of the first pressing surface 56). b) is set smaller than the thickness (diameter dimension e) of the seal member 15 in the tube axis direction, so that the seal member 15 fitted and held in the seal fitting groove 14 of the seal holding member 13 The second pressing surface 57 of the seal fitting groove 14 of the holding member 13 and the one end surface 44 of the joint body 12 or others. The inner peripheral portion of the seal member 15 is sandwiched between the surface 45 and elastically deformed toward the inner diameter side, and the outer peripheral surfaces of the end portions 23 and 26 of the first tubular body 21 or the second tubular body 22 are formed. Since the sealing performance can be ensured by contacting liquids 24 and 27 in a liquid-tight and air-tight manner over the entire circumference, the end 23 of the first tube 21 and the end 26 of the second tube 22 are hermetically sealed. In addition, liquid-tight communication connection can be established, and liquid-tight and air-tight communication connection between the end portion 23 of the first tube body 21 and the end portion 26 of the second tube body 22 can be ensured with a simple configuration. For this reason, the connection work between the end 23 of the first tube 21 and the end 26 of the second tube 22 can be facilitated.

  On the other hand, in a state where the seal holding member 13 is fastened and fixed to both end portions 42 and 43 of the joint body 12 with the socket bolt 62 and the fixing nut 64, the fixing nut 64 fixed to the tip end portion of the socket bolt 62 is By removing, the tightening and fixing to the joint main body 12 by these seal holding members 13 is released, and these seal holding members 13 can be removed from both end portions 42 and 43 of the joint main body 12, and the seal holding members 13 The seal members 15 can be removed from the seal fitting grooves 14 respectively. Therefore, the disassembly work of the joint main body 12 and the seal holding member 13 can be easily performed, so that the maintainability of the pipe connection device 10 can be improved.

  Further, by simply tightening and fixing the annular seal holding member 13 to both ends 42 and 43 of the cylindrical joint body 12 with the socket bolt 62 and the fixing nut 64, the joint body 12 can be connected via the seal holding member 13. The end 23 of the first tube 21 and the end 26 of the second tube 22 inserted from both end portions 42 and 43 can be connected to each other. Means are obtained.

  Furthermore, since the structure of the joint body 12 and the seal holding member 13 is simple and easy to process, the manufacturing cost of the joint body 12 and the seal holding member 13 can be reduced, so the productivity of the pipe connection device 10 is greatly improved. it can.

  At this time, in a state before the seal member 15 is elastically deformed by tightening and fixing to the joint body 12 by the seal holding member 13, the seal member 15 does not protrude inward from the inner peripheral surface 54 of the seal holding member 13. Therefore, when inserting the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 into the both end portions 44 and 45 of the joint body 12 through the seal holding member 13, respectively. A joint between the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 by the inner peripheral surface of the sealing member 15 fitted and held in the seal fitting groove 14 of the seal holding member 13. Insertion into both end faces 44 and 45 of the main body 12 is not hindered. Therefore, it is possible to easily insert the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 into the both end faces 44 and 45 of the joint body 12 via the seal holding member 13.

  Further, by adjusting the diameter dimension e of the cross section of the seal member 15, the pair of seal holding members 13 in which the seal member 15 is fitted and held in the seal fitting groove 14 are attached to both end portions 42 and 43 of the joint body 12. The amount of elastic deformation of the sealing member 15 when tightened and fixed can be adjusted. Accordingly, the amount of contact of the seal member 15 with the outer peripheral surfaces 24 and 27 of the end portions 23 and 26 of the first tube body 21 and the second tube body 22 inserted from both end portions 42 and 43 of the joint body 12 is determined. Since the diameter dimension e of the cross section of the seal member 15 is appropriately adjusted, the connection between the end portions 23 and 26 of the first tube body 21 and the second tube body 22 by the seal member 15 can be further improved. You can be sure.

  In addition, one inner peripheral step having a stepped cross section that penetrates the inner peripheral surface 29 and the connecting surface 28 of the first tubular body 21 at the inner edge of the connecting surface 28 of the end portion 23 of the first tubular body 21. And an outer peripheral step having a stepped cross section that penetrates the outer peripheral surface 27 and the connecting surface 35 of the second tubular body 22 at the outer edge of the connecting surface 35 of the end portion 26 of the second tubular body 22. When the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 are opposed to each other and are coaxially contacted with each other, the first tubular body 21 By fitting one inner circumferential step portion 31 and the outer circumferential step portion 37 of the second tubular body 22, the tubular bodies 21, 22 can be continuous, integrated, and stabilized.

  Since the first tube body 21 and the second tube body 22 can be coaxially connected to each other, the first tube body 21 is connected from both end portions 42 and 43 of the joint body 12 via the seal holding members 13. In the state in which the end portion 23 of the first tubular body 22 and the end portion 26 of the second tubular body 22 are inserted, the outer circumferential step of the second tubular body 22 is inserted into one inner circumferential step portion 31 of the first tubular body 21. The end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 can be reliably and easily connected in a coaxial manner by simply fitting the portion 37. These first tubular bodies 21 and the end portions 23 and 26 of the second tubular body 22 can be easily connected in the joint body 12, and the end portions 23 of the first tubular body 21 and the ends of the second tubular body 22 can be easily connected. Deviation in the direction perpendicular to the axial direction with respect to the portion 26 can be prevented. Therefore, the liquid-tight and air-tight communication connection between the end 23 of the first tube 21 and the end 26 of the second tube 22 using the pipe connection device 10 can be performed more reliably and easily. The communication connection between the end 23 of the first tube 21 and the end 26 of the second tube 22 can be reliably maintained.

  At this time, by fitting the outer peripheral step portion 37 of the second tubular body 22 to one inner peripheral step portion 31 of the first tubular body 21, the end portion 23 of the first tubular body 21 and the second tubular portion When the end portion 26 of the tube body 22 is connected in communication, a gap formed between the end portion 23 of the first tube body 21 and the end portion 26 of the second tube body 22 can be prevented. Therefore, the end 23 of the first tubular body 21 and the second tubular body when conveying a transported object such as chips together with the air through the first tubular body 21 and the second tubular body 22. It is possible to reliably prevent the conveyed product from entering between the end portions 26 of 22 with a simple configuration.

  In this embodiment, the seal fitting groove 14 is formed on the inner edge of the inner side surface 52 of the seal holding member 13 of the pipe connection device 10, but this seal fitting groove 14 is formed on one end surface 44 of the joint body 12 or It can also be formed on the inner edge of the other end face 45, one end face 44 of the joint body 12, or the inner edge of the other end face 45 and the inner edge of the inner side face 52 of the seal holding member 13. That is, the seal fitting groove 14 includes at least one of the one end surface 44 or the other end surface 45 of the joint body 12 and the inner surface 52 of the seal holding member 13, and the other of the joint body 12 and the seal holding member 13. It suffices if it is provided at a position adjacent to.

  Further, as a means for fixing each seal holding member 13 to both end faces 44 and 45 of the joint body 12, tightening fixation using a socket bolt 62 and a fixing nut 64 was used. For example, the tip of the socket bolt 62 inserted into the bolt insertion hole 58 of the seal holding member 13 is screwed into the bolt insertion hole 46 of the joint body 12 and fixed. Even if the seal holding member 13 is fixed to both end portions 42 and 43 of the joint body 12 by welding or the like, it can be used correspondingly.

  Further, the end portion 23 of the first tubular body 21 and the end portion 26 of the second tubular body 22 that are inserted into the both end portions 42 and 43 of the joint body 12 are brought into contact with each other through the seal holding member 13. The outer peripheral step portion 37 of the second tubular body 22 is fitted to one inner peripheral step portion 31 of the first tubular body 21, but the end portion 23 of the first tubular body 21 and the second The end portion 26 of the second tubular body 22 may not be brought into contact with or engaged with the end portion 26.

  Next, the pipe connection device of another embodiment shown in FIG. 5 and the pipe connection device of still another embodiment shown in FIG. 6 will be described.

  FIG. 5 shows a pipe connecting device 10a using a T-shaped pipe joint, and a T-shaped joint body 12 is fitted on the outer peripheral surface of a tubular body 11 arranged in three directions. An annular seal holding member 13 is fitted on the outer peripheral surface of each tubular body 11 so as to oppose the three end surfaces of each, and an annular inner side of the opposing surface of each seal holding member 13 facing the joint body 12 is annular. The seal fitting grooves 14 are provided, and annular seal members 15 are fitted into the seal fitting grooves 14, respectively. The seal fitting grooves 14 are smaller than the thickness of the seal member 15 in the tube axis direction. Since the groove width in the tube axis direction is set, when the joint body 12 and each seal holding member 13 are fixed in a direction in which the seal member 15 is clamped by the fixing means 16, the seal member 15 is elastic to the inner diameter side. It can be deformed and brought into close contact with the outer peripheral surface of the tubular body 11 to ensure sealing performance.

  FIG. 6 shows a pipe connecting device 10b using an elbow type pipe joint. An elbow type joint body 12 is fitted to the outer peripheral surface of the tubular body 11 arranged in two orthogonal directions. An annular seal holding member 13 is fitted to the outer peripheral surface of the tubular body 11 so as to face the one end surface and the other end surface, respectively, and an annular surface is provided on the inner diameter side of the facing surface of each seal holding member 13 facing the joint body 12. Seal fitting grooves 14 are provided, and annular seal members 15 are fitted into the seal fitting grooves 14, respectively.The seal fitting grooves 14 are set to be smaller than the thickness of the seal member 15 in the tube axis direction. Therefore, when the joint body 12 and each seal holding member 13 are fixed in a direction in which the seal member 15 is clamped by the fixing means 16, the seal member 15 is elastically deformed toward the inner diameter side. As a result, it can be brought into close contact with the outer peripheral surface of the tubular body 11 to ensure sealing performance.

  The pipe connection devices 10, 10a, 10b of the present invention can be used for, for example, a pipe line for collecting chips discharged from a machine tool.

It is sectional drawing which shows one Embodiment of the piping connection apparatus which concerns on this invention. It is a disassembled perspective view which shows a piping connection apparatus same as the above. It is sectional drawing which shows a part of state before an assembly of a pipe connection apparatus same as the above. It is sectional drawing which shows a part of state at the time of the assembly of a piping connection apparatus same as the above. It is sectional drawing which shows other embodiment of a piping connection apparatus same as the above. It is sectional drawing which shows another embodiment of piping connection apparatus same as the above.

Explanation of symbols

10, 10a, 10b Pipe connection device
11 Tubular body
12 Fitting body
13 Seal holding member
14 Seal fitting groove
15 Seal material
16 Fixing means
21 First tube
22 Second tube
23 Edge
26 edge
31 Inner peripheral step as uneven part
37 Peripheral steps as uneven parts
46 Bolt insertion holes as through holes
58 Bolt insertion hole as through hole
62 Socket bolt as a bolt
64 Fixed nut as nut

Claims (5)

A joint body fitted to the outer peripheral surface of the tubular body;
An annular seal holding member fitted to the outer peripheral surface of the tubular body facing the end surface of the joint body;
An annular seal fitting groove provided on the inner diameter side of at least one of the opposing surfaces of the seal holding member and the joint body;
An annular seal member fitted in the seal fitting groove;
A pipe connection device comprising: a fixing means for fixing the joint body and the seal holding member in a direction in which the annular seal member is clamped. The tubular body is provided with the first tube body and the second tube body facing each other,
The joint body is fitted to the first tube body and the second tube body,
The pipe connection device according to claim 1, wherein the seal holding member and the seal member are provided on one end surface and the other end surface of the joint main body, respectively. The pipe connection device according to claim 1 or 2, wherein a groove width in the tube axis direction of the seal fitting groove is set smaller than a thickness of the seal member in the tube axis direction. The fixing means is
A through hole formed through the joint body and a seal holding member disposed opposite to both end faces thereof;
A bolt inserted into the through hole,
The pipe connection device according to claim 2 or 3, further comprising: a nut that is screwed into a bolt to fasten the joint main body and seal holding members at both end faces thereof. The pipe connection device according to any one of claims 2 to 4, wherein the opposing ends of the first tubular body and the second tubular body are provided with concave and convex portions that are fitted to each other.

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