JP2007024154A - Joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure having high sealing performance for surely preventing the occurrence of a dead spot. <P>SOLUTION: The joint structure is provided for joining a first joint face of a first member 2 to the second joint face of a second member 4 via an O-ring in an air-tight condition. The second joint face 5 is provided with an abutting surface 7 inclined to the direction of joining the first member 2 to the second member 4. The first joint face 3 opposed to the abutting surface 7 is provided with a ring recessed portion 8. The ring recessed portion 8 consists of a mounting recessed portion 81 which is provided at the end on the side of keeping it in the air-tight condition and in which the O-ring is mounted, and an escape recessed portion 82 into which part of the O-ring 6 mounted in the mounting recessed portion 81 and plastically deformed in contact with the abutting surface 7 is put. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joining structure suitable for joining tubular members, joining a container and a lid member, and the like.

  Conventionally, as a pipe joint which is a joint between tubular members, 1. Adhesion / fusion / welding; Screw, 3. Flange etc. are known.

  The first bonding method is often used for synthetic resin pipes, and a male / female taper surface is provided on a pipe to be bonded, and an adhesive is applied to the taper surface for bonding. However, in the case of high pressure, the bonding area must be wide. In the fusion method, both joint surfaces are melted and joined. In addition, there is a welding method such as a butt or insertion method, and welding is performed using a welding rod made of the same material as the pipe to be joined while being melted. Since these methods are all permanent bonding, they cannot be detached after bonding.

  The screw coupling method 2 only needs to be screwed strongly in the case of a metal tube, but in the case of a synthetic resin tube, etc., it is easy to influence the variation in screw processing, and it is difficult to determine the end, so it is due to excessive insertion Prone to tube damage.

  In the case of No. 3 flange system, flanges are provided on the joint surfaces of both pipes, packing is attached, and bolts are tightened. Conventionally, these methods have been carried out mainly on-site. However, in order to improve workability, mass production or a method of attaching a product produced in a separate process is required on the site. Is becoming mainstream.

  In this flange system, the packing has a rectangular cross section, a circular cross section, or a combination of a rectangle and a circle. In any case, the contact surface of the flange is a flat surface. It will join by pinching. A slight gap is created between the flange and the packing. If the pipe contents stay in this gap (hereinafter sometimes referred to as “dead spot”), the following problems occur. For example, when the contents are medicines, foods and drinks, pure water, etc., there is a risk that bacteria may be generated in the liquid retained in the dead spot. Depending on the type of liquid, crystals may be formed.

This dead spot is also observed in other joints. In the case of the above-described bonding method 1, since the adhesive at the tip is thinned by friction during insertion, irregularities are formed between the bonding surface and the content liquid stays. Depending on the type of liquid, the adhesive may start to dissolve. Also in the case of a fusion joint, the tip of the insertion portion is pushed back by the same friction to form a recess. In a welded joint, a concave portion is formed at a shallow place of welding and becomes a dead spot. Further, in the above-described two threaded joints, dead spots are formed in such a way that liquid is clogged in the gaps between the threaded portions. In order to solve the above problems, it is a current problem to improve the sealing property and eliminate the dead spot. For this reason, the present applicant has previously proposed a joint structure that has high sealing properties and prevents the occurrence of dead spots (see Patent Document 1).
JP-A-6-109175

  What is described in this Patent Document 1 is that the abutting portion (angle with respect to the axial direction (joining direction)) of the abutting portion of the joining surface of the first tubular member is set to 20 ° to 80 °, and this abutting portion. By providing a J-shaped groove on the joint surface of the second tubular member facing the surface and attaching an O-ring to a part of the J-shaped groove, the sealing performance is high and the occurrence of dead spots is prevented. It was a thing. By the way, when two tubular members are joined, the O-ring attached to the J-shaped groove comes into contact with the abutting portion and undergoes plastic deformation, and this deformed O-ring enters the entire area of the J-shaped groove into the space 2. Two tubular members are joined in an airtight state, but depending on the inclination angle of the abutting part, the O-ring deformed when joining the two tubular members is radially outward or inward of the tubular member from the J-shaped groove. In some cases, the two tubular members were joined in a state of protruding. As a result, a dead spot may be formed between the two tubular members, or an O-ring may protrude from the inner surface of the tubular member, and the occurrence of the dead spot cannot be reliably prevented.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a joint structure that has high sealing properties and can reliably prevent the occurrence of dead spots.

  A joining structure according to the present invention for achieving the above object is a joining structure in which the first joining surface of the first member and the second joining surface of the second member are joined in an airtight state via an O-ring, A contact surface inclined with respect to the direction in which the first member and the second member are bonded to each other is provided on one of the first bonding surface and the second bonding surface, and is opposed to the contact surface. A ring concave portion is provided on the other surface of the first joint surface or the second joint surface, and the ring concave portion is provided on the end side on the side to be maintained in the airtight state, and the O-ring is mounted. It is characterized by comprising a mounting recess and an escape recess into which a part of the O-ring that is mounted in the mounting recess and is plastically deformed in contact with the contact surface enters.

  According to the present invention, when the first joint surface of the first member and the second joint surface of the second member are joined, the O-ring mounted on the mounting recess of the ring recess contacts the contact surface, and the O-ring is plastic. A part thereof is deformed and enters the recess, and the first member and the second member are joined in an airtight state via the O-ring. At this time, since the contact surface is inclined with respect to the joining direction of the first member and the second member, the O-ring deformed when joining the two members protrudes from the ring recess and protrudes. Since the two members are not joined together, it is possible to reliably prevent the occurrence of dead spots.

  In the joint structure according to the present invention, it is preferable that an angle of the contact surface is 30 ° to 45 ° with respect to a direction in which the first member and the second member are joined to each other. Further, in the bonding structure according to the present invention, the first bonding surface and the second bonding surface are each formed in a step shape, and the contact surface is formed on the bonding surface on the side maintained in the airtight state among these bonding surfaces. And it is preferable that the said ring recessed part is provided. Further, in the joining structure according to the present invention, flange portions are provided on the outer surface of the first member and the outer surface of the second member, respectively, and the flange portions are fastened to each other by a fastening member, It is preferable that the first member and the second member are tubular members, respectively. In the joining structure according to the present invention, it is preferable that one of the first member and the second member is a container, and the other of the first member and the second member is a lid member.

  As described above, according to the joining structure according to the present invention, the contact surface inclined by 39 ° to 40 ° with respect to the joining direction is provided on one of the first joining surface and the second joining surface. Since either the first joint surface or the second joint surface is provided with a ring recess composed of a mounting recess to which the O-ring is mounted and a relief recess into which a part of the deformed O-ring enters, the sealing performance is improved. And the occurrence of dead spots can be reliably prevented.

  Hereinafter, the joint structure according to the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 are views showing an example of a joining structure according to the present invention. As shown in FIGS. 1 and 2, the joining structure according to the present invention joins the first joining surface 3 of the first member 2 and the second joining surface 5 of the second member 4 in an airtight state via an O-ring 6. To do. This joining structure 1 according to the present invention is suitable for joining tubular members, joining a container (including a bottle or the like) and a lid member, and the like. In addition, although the form of this invention demonstrates mainly the case where two tubular members are joined, it is not limited to this.

  The first member 2 and the second member 4 are, for example, tubular members having substantially the same inner diameter, and may be a metal tube or a resin tube, and are not particularly limited. The first member 2 and the second member 4 may be the same material tube or different material tubes. When the first member 2 and the second member 4 are joined to each other at the end where the thickness is small, it is preferable to form the end so that the thickness can be joined. The end surface of the end of the first member 2 (sometimes referred to as the first joint surface 3) and the end surface of the end of the second member 4 (sometimes referred to as the second joint surface 5) are joined together. It is the surface to be done.

  In the joining structure 1 according to the present invention, the first member 2 and the second member 4 are joined to one of the first joining surface 3 and the second joining surface 5, for example, the second joining surface 5. An inclined contact surface 7 is provided, and a ring recess 8 is provided on the other surface of the first joint surface 3 or the second joint surface 5 facing the contact surface 7, for example, the first joint surface 3. The ring recess 8 is provided on the end side on the side to be kept in an airtight state and is mounted with the O-ring 6. The ring recess 8 is mounted on the mounting recess 81 and comes into contact with the contact surface 7 and is plastically deformed. The O-ring 6 is characterized in that it comprises an escape recess 82 into which a part of the O-ring 6 enters. In addition, in embodiment of this invention, while providing the contact surface 7 in the 2nd joining surface 5, and providing the ring recessed part 8 in the 1st joining surface 3, it is not limited to this, A contact surface may be provided on the first joint surface 3 and a ring recess may be provided on the second joint surface 5.

  It is preferable that the 1st joint surface 3 and the 2nd joint surface 5 are formed in two steps in the cross-sectional step shape which can mutually be fitted. That is, the first bonding surface 3 is formed with two ring-shaped surfaces of the first inner bonding surface 31 and the first outer bonding surface 32, and the second bonding surface 5 is formed with the second inner bonding surface 51. Two ring-shaped surfaces of the second outer joint surface 52 are formed. Thereby, the first joint surface 3 of the first member 2 and the second joint surface 5 of the second member 4 can be easily fitted, that is, connected on the same axis. It is preferable that the thickness of the first inner joint surface 31 and the thickness of the second inner joint surface 51 are each formed to be slightly longer than the diameter of the O-ring 6.

  The contact surface 7 is preferably the second inner joint surface 51 of the second inner joint surface 51 and the second outer joint surface 52. The contact surface 7 is formed to be inclined. The inclination angle of the contact surface 7 is an angle with respect to the axial direction of the second member 4 (direction in which the first member 2 and the second member 4 are joined), and is in contact with the axial direction of the inner surface of the second member 4. The angle α in the thickness direction of the surface. The inclination angle α is preferably 30 ° to 45 °, more preferably 39 ° to 40 °, and particularly preferably 40 °. When the inclination angle α exceeds 45 °, the O-ring 6 deformed during joining may protrude from the inner surfaces of the first member 2 and the second member 4 inward in the radial direction. If it is less than 30 °, the O-ring 6 deformed at the time of joining extends radially outward of the first member 2 and the second member 4 and is sandwiched between the first joining surface 3 and the second joining surface 5 and There may be a gap, that is, a dead spot, inside the first member 2 and the second member 4. In the present invention, 30 ° includes approximately 30 °, 39 ° includes approximately 39 °, 40 ° includes approximately 40 °, and 45 ° includes approximately 45 °. Shall be.

  The ring recess 8 is formed in the first inner joint surface 31. The ring recess 8 includes a mounting recess 81 in which the O-ring 6 is mounted, and a relief recess 82 in which a part of the O-ring 6 that is mounted in the mounting recess 81 and contacts the contact surface 7 and is plastically deformed enters. . The mounting recess 81 is provided in the vicinity of the inner surface of the first inner joint surface 31 on the inner surface side (the end side on the side that is kept airtight, that is, the inner surface side). The mounting recess 81 is formed in a circular arc shape in which the outer peripheral surface of the O-ring 6 can be fitted. The mounting recess 81 is formed such that the contact surface 7 comes into contact with the O-ring 6 mounted when the first bonding surface 3 and the second bonding surface 5 are bonded, and the O-ring 6 can be plastically deformed. Yes. The escape recess 82 has a bottom surface formed in a planar shape (straight section) from the end of the mounting recess 81. The escape recess 82 is formed so that a part of the O-ring 6 that is deformed at the time of joining enters.

  That is, the ring concave portion 8 including the mounting concave portion 81 and the escape concave portion 82 has a bottom section formed in a substantially J shape. The cross-sectional area (first space) formed by the ring recess 8 and the contact surface 7 (the space formed by the ring recess 8 and the contact surface 7 when the first member 2 and the second member 4 are joined) The cross-sectional area in the thickness direction of the member 2 and the second member 4) is preferably 17% to 20% of the cross-sectional area of the O-ring 6. When the cross-sectional area exceeds 20%, the O-ring 6 deformed at the time of joining may protrude from the inner surfaces of the first member 2 and the second member 4 inward in the radial direction, and the cross-sectional area is 17 If it is less than%, the O-ring 6 deformed at the time of joining extends radially outward of the gap between the first member 2 and the second member 4 and is sandwiched between the first joining surface 3 and the second joining surface 5. A gap, that is, a dead spot may be formed inside the first member 2 and the second member 4. In the present invention, 17% includes approximately 17%, and 20% includes approximately 20%.

  Now, the first joint surface 3 of the first member 2 and the second joint surface 5 of the second member 4 in which the O-ring 6 is mounted in the mounting recess 81 are aligned approximately coaxially with each other. The first joint surface 3 and the second joint surface 5 are fitted and inserted into the first outer joint surface 32 of the first joint surface 3 by the second inner joint surface 51 of the second joint surface 5. As a result, the O-ring 6 of the first joint surface 3 and the contact surface 7 of the second joint surface 5 come into contact with each other, the O-ring 6 is plastically deformed, and a part thereof enters the relief recess 82 of the first joint surface 3. The first member 2 and the second member 4 are joined in an airtight state via the O-ring 6.

  At this time, since the contact surface 7 is inclined with respect to the axial direction of the second member 4, for example, 40 °, the O-ring is deformed when the two members 2 and 4 are joined. Since 6 does not protrude from the ring recess 8, the first member 2 and the second member 4 can be joined without the O-ring 6 being sandwiched between the first joining surface 3 and the second joining surface 5. . Therefore, the joint structure 1 according to the present invention can ensure a reliable and high sealing performance, reliably prevent the occurrence of dead spots, and can withstand high pressure use.

  In addition, flange portions (not shown) are provided on the outer surface of the first member 2 and the outer surface of the second member 4, respectively, and these flange portions are fastened to each other by a fastening member (not shown). And the second joining surface 5 may be joined. In this case, for example, the flange portion may be formed to extend radially outward from the first outer joint surface 32 of the first member 2 and the second outer joint surface 52 of the second member 4. Thereby, the 1st member 2 and the 2nd member 4 can be joined reliably. Moreover, although a bolt etc. may be used as a fastening member, it is preferable to use a clamp. By using the clamp, for example, it is possible to perform the tightening more easily than when tightening with a bolt or a nut.

  Further, when joining the first member 2 and the second member 4 of different materials, for example, as shown in FIG. 3, when joining the first member 21 of the metal tube and the second member 41 of the resin tube, the flange portion The first joint portion 22 having the first joint surface 23 and the first joint surface 24 is coaxially fixed to the end portion of the first member 2 by, for example, welding or the like, and has a socket-like second shape having the flange portion 43 and the second joint surface 44. The joining portion 42 is fixed to the end portion of the second member 41. After the first joint portion 22 and the second joint portion 42 are joined in the same manner as described above, the first member 21 and the second member 41 are fastened by fastening the flange portions 23 and 43 with a fastening member such as the clamp 11. Bonding can be performed reliably and with high sealing properties, and the occurrence of dead spots can be reliably prevented.

  When joining metal tubes, for example, as shown in FIG. 4, the end surface of the first member 101 is formed as a first inner joint surface, and the first outer side is formed on the outer peripheral surface of the end portion of the first member 101. The first flange member 102 that becomes the joint surface 103 and the flange portion 104 is fixed with, for example, a screw 105. Further, the end surface of the second member 111 is formed as a second inner joint surface, and the second flange member 112 that becomes the second outer joint surface 113 and the flange portion 114 is formed on the outer peripheral surface of the end portion of the second member 111 with, for example, screws. Stop 115. After the end face of the first member 101 and the end face of the first flange member 102 and the end face of the second member 111 and the second flange member 112 are joined in the same manner as described above, the flange portions 104 and 114 are fastened by a fastening member such as a clamp 12. By tightening, the first member 101 and the second member 111 can be reliably joined with high sealing properties, and the occurrence of dead spots can be reliably prevented.

  When the container (including a bottle or the like) and the lid member are joined, for example, as shown in FIG. 5, the opening part of the container (first member) 121 has a flange part 123 and a first joining surface 124. The first joint 122 is fixed on the same axis, for example, by welding. A flange portion 133 is provided on the peripheral surface of the lid member (second member) 131. After the container 121 and the lid member 131 are joined in the same manner as described above, the container 121 and the lid member 131 can be joined reliably and with high sealing performance by fastening the flange portions 123 and 133 with a fastening member such as the clamp 13. At the same time, it is possible to reliably prevent the occurrence of dead spots.

  As described above, in the joining structure according to the present invention, the contact surface inclined with respect to the joining direction is provided on either one of the first joining surface of the first member and the second joining surface of the second member. In addition, a ring comprising a mounting recess in which the O-ring is mounted and a relief recess in which a part of the deformed O-ring enters the other surface of the first bonding surface of the first member or the second bonding surface of the second member. Since the concave portion is provided, the sealing property is high and the occurrence of dead spots can be surely prevented. Therefore, it is excellent in joining the tubular members and joining the container and the lid member.

It is sectional drawing which shows an example of the junction structure which concerns on this invention. It is principal part sectional drawing which shows an example of the junction structure which concerns on this invention, (a) is a figure which shows the state before joining, (b) is a figure which shows the state after joining. It is sectional drawing which shows the other example of the junction structure which concerns on this invention. It is sectional drawing which shows the other example of the junction structure which concerns on this invention. It is sectional drawing which shows the other example of the junction structure which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joining structure 2 1st member 3 1st joining surface 4 2nd member 5 2nd joining surface 6 O-ring 7 Contact surface 8 Ring recessed part 21 1st member 41 2nd member 81 Mounting recessed part 82 Escape recessed part 101 1st member 111 Second member 121 First member 131 Second member

Claims (6)

A joining structure for joining the first joining surface of the first member and the second joining surface of the second member in an airtight state via an O-ring,
A contact surface inclined with respect to the direction in which the first member and the second member are bonded to each other is provided on one of the first bonding surface and the second bonding surface, and is opposed to the contact surface. A ring concave portion is provided on the other surface of the first joint surface or the second joint surface, and the ring concave portion is provided on the end side on the side to be maintained in the airtight state, and the O-ring is mounted. A joining structure comprising: a mounting concave portion; and a relief concave portion into which a part of an O-ring which is attached to the mounting concave portion and contacts the contact surface and is plastically deformed enters.   The joint structure according to claim 1, wherein an angle of the contact surface is 30 ° to 45 ° with respect to a direction in which the first member and the second member are joined to each other.   The first joint surface and the second joint surface are each formed in a stepped shape, and the contact surface and the ring recess are provided on a joint surface of the joint surfaces that is maintained in the airtight state. The joint structure according to claim 1, wherein:   A flange portion is provided on each of the outer surface of the first member and the outer surface of the second member, and the flange portions are fastened together by a fastening member to join the first joint surface and the second joint surface. The joining structure according to any one of claims 1 to 3.   The joining structure according to claim 1, wherein each of the first member and the second member is a tubular member. Either one of the first member and the second member is a container, and the other one of the first member and the second member is a lid member. 2. The joining structure according to item 1.

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