JP4914663B2 - Telescopic joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighter telescopic universal joint having chemical resistance to chemical liquid flowing therein. <P>SOLUTION: The telescopic universal joint comprises a pair of body pipes 1A, 1B having linear sliding motion, and a pair of joint pipes 2, 2 connected to the ends of the body pipes 1A, 1B, respectively, in a spherically slidable manner, the body pipes and the joint pipes being each formed of vinyl chloride resin. A connection part between the body pipes 1A, 1B and a connection part between each of the body pipes 1A, 1B and each of the joint pipes 2 use seal materials 5, 12, respectively, which have at least surface layers formed of Teflon (R). The seal materials 5, 12 are O-rings, e.g. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a telescopic joint used for various piping systems such as water pipes and equipment piping, and more particularly to a telescopic joint useful for equipment piping in a building adopting a seismic isolation structure in a chemical plant, for example.

This type of expandable joint has a free structure at both ends and an expandable structure at the middle. More specifically, each has a spherical bulge at one end and the other ends are slidable linearly. And a pair of joint pipes formed at one end of a spherical concave portion that is slidably connected to a spherical bulge portion of the main body tube. In the past, it has been used mainly for buried pipes such as water pipes buried in the ground. However, as described in Patent Document 1, for example, it has been widely used for equipment piping in buildings in recent years. Has reached the point.
Japanese Patent Laid-Open No. 9-196263

  By the way, as for the said conventional expansion-contraction joint, both a main body pipe and a joint pipe are metal, the connection part (linear sliding part as an expansion-contraction structure) between main body pipes, and the connection of a main body pipe and a joint pipe, respectively. A rubber O-ring or rubber packing is used as a sealing material in the portion (spherical sliding portion as a free structure).

  Therefore, the expandable joint with such a structure is not only heavy, but when a chemical solution or the like is circulated inside, depending on the type and concentration of the chemical solution, the rubber may deteriorate and the sealing performance may deteriorate. For example, it is not suitable for equipment piping in a building in a chemical plant.

  Then, this invention is made | formed in view of the said problem, and makes it a subject to provide the expansion-contraction joint provided with chemical | medical solution resistance with respect to the chemical | medical solution which is lightweight and distribute | circulates the inside.

The expandable joint according to the present invention is made in order to solve the above-mentioned problems, and a pair of main body tubes each having a spherical bulge portion formed at one end portion and the other end portions being linearly slidably connected to each other. And a telescopic joint comprising a pair of joint pipes formed at one end with a spherical concave part that is slidably connected to the spherical bulge part of the main body pipe. The main body pipe and the joint pipe are each made of vinyl chloride. A sealing material made of resin and having at least a surface layer made of Teflon (registered trademark) is used as a sealing material in a connecting portion between main body tubes and a connecting portion between each main body tube and a joint pipe, The wiper packing that is slidably in contact with the surface of the other end of the other body tube is provided at the other end of the other body tube so as to be movable in a radial direction. The liquid remaining on the surface of Telescopic joint, characterized in that it is configured so that it can take come.

According to such a configuration, the main body pipe and the joint pipe are each made of vinyl chloride resin, so that it is lighter than conventional metal pipes, and at least the surface layer is made of Teflon (registered trademark) By using the packing as a sealing material, when a chemical solution is circulated inside, it has chemical resistance as compared with a conventional rubber product. Further, according to such a configuration, when the main body tubes slide with each other, for example, after an earthquake occurs, the liquid remaining on the surface of the other main body tube is wiped off. Moreover, since the wiper packing is movable in the radial direction, the wiper packing can follow even if the main tube is displaced when the main tubes are slid.

  In addition, the expandable joint according to the present invention is a connecting portion between main body tubes by a support stand that is movable on the floor surface in order to prevent the main body tube from being bent due to the weight of the main body tube and the weight of the liquid existing in the main body tube. A configuration in which is supported can be employed.

  Unlike conventional metal pipes, the main body pipe and joint pipe are made of vinyl chloride resin to achieve light weight. It is conceivable that the main body tube bends (particularly at the connecting portion between the main body tubes) due to the weight of the liquid present. So, according to this structure, the bending part can be prevented by the connection part of main body tubes being supported by a support stand.

  Moreover, by configuring the support base so as to be movable on the floor surface, even if the main body pipes slide linearly or the main body pipe and the joint pipe slide spherically, the overall flexible form may change. The support base follows this and moves on the floor surface, and exhibits a suitable response. Therefore, even when an earthquake occurs after the passage of time, for example, the support at the connecting portion between the main body tubes is suitably maintained, and no deflection occurs.

  Further, the expandable joint according to the present invention has a configuration in which a plurality of sealing materials are arranged at intervals in the sliding direction in the connecting portion between the main body tubes and / or the connecting portion between the main body tube and the joint tube. Can be adopted.

  According to this structure, even if the surface of the main body pipe or the joint pipe is locally damaged, it has a suitable sealing property. In other words, if the wound is positioned so as to straddle one sealing material, liquid oozes out along the wound, but since another sealing material is located in the sliding direction, the liquid oozes out there. The liquid is prevented from leaking outside.

  In the expandable joint according to the present invention, an annular guide member for guiding the sliding of the one main body pipe is provided at the other end portion of the other main body pipe, and the exhaust pressure is applied to the guide member. It is possible to adopt a configuration in which a punched hole is appropriately formed.

  For example, when an earthquake occurs after aging, a guide member is arranged between one main body tube and the other main body tube so that the main body tubes can slide while maintaining the concentricity between the main body tubes. In this case, due to the liquid that has entered the space defined by the pair of main body tubes, the guide member, and the seal member at all times, when the main body tubes slide with each other, for example, after an earthquake, Unnecessary buffer action occurs. However, according to the above configuration, the formation of the exhaust pressure release hole in the guide member suppresses the occurrence of a buffering action, so that it is preferable that the main body tubes do not slide smoothly due to an unnecessary buffering action. Can be prevented.

  As described above, according to the present invention, the main body pipe and the joint pipe are each made of a vinyl chloride resin, and at least the surface as a sealing material in the connection part between the main body pipes and the connection part between the main body pipe and the joint pipe. By using a sealing material whose layer is made of Teflon (registered trademark), it is possible to realize both the lightness in transportation and construction and the chemical resistance against the chemical flowing through the inside. For this reason, regardless of whether the pipe is a vertical pipe or a horizontal pipe, it can be effectively used, for example, for equipment piping in a building in a chemical plant.

  In addition, the conventional rubber O-ring and packing as a sealing material are easily fixed to the main body pipe and the joint pipe due to secular change. There is a risk of affecting the slidability at the connecting part between the main body pipe and the joint pipe. In this case, in the worst case, the sealing material is damaged and the connecting parts between the main body pipes or the main body pipe and the joint pipe are respectively damaged. However, since Teflon (registered trademark) is non-adhesive, the connection between the main body pipes and the connection between the main body pipe and the joint pipe can be maintained. Stable slidability and sealability can be maintained at the connecting portion, and therefore, it is very effective for equipment piping in a building having a seismic isolation structure.

  Hereinafter, an embodiment of an expandable joint according to the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of the expandable joint according to the present embodiment. The expandable joint according to the present embodiment has a pair of main body pipes 1A and 1B made of vinyl chloride resin, the other ends of which are connected so as to be linearly slidable, and a spherical slide on one end of each of the main body pipes 1A and 1B. A pair of joint pipes 2 and 2 made of vinyl chloride resin, which are freely connected, and each having a spherical sliding portion as a free structure at both ends and a linear sliding portion as a stretchable structure at an intermediate portion. It is a universal joint.

  Here, since the other end of the one main tube 1A is extrapolated to the other end of the other main tube 1B, a tube having a larger diameter than that of the other main tube 1B is used. However, since the left and right joint pipes 2 are desired to share the same from the viewpoint of cost reduction, one end of one main body pipe 1A needs to have the same diameter as one end of the other main body pipe 1B. Accordingly, one main body pipe 1A is fitted into the main pipe 1a having a larger diameter than the other main body pipe 1B and the main pipe 1a, and one end thereof is the same diameter as one end of the other main body pipe 1B. It is composed of a throttle tube 1b to be contracted.

  In addition, the expandable joint according to the present embodiment has casters (rolling members) and can move on the floor surface in order to prevent deflection due to the weight of the main body tubes 1A and 1B and the weight of the liquid flowing inside. The intermediate portion (the connecting portion between the main body pipes 1A and 1B) is supported by the support base 3. In addition, an elastic body such as a rubber pad is sandwiched between portions of the support base 3 that are substantially in contact with the connecting portion between the main body tubes 1A and 1B from below, thereby elastically supporting the floor surface (of the support base 3). It is possible to reduce push-up due to unevenness of the travel surface, etc., and to keep the connecting portion between the main body tubes 1A and 1B horizontal.

  Although not shown, the pair of joint pipes 2 and 2 are connected to the pipes constituting the pipe system, respectively. Therefore, the expandable joint according to this embodiment is shown in the drawing. Although it seems to be supported only by the support base 3, in reality, both ends are supported by the pipe and the intermediate part is supported by the support base 3. Moreover, the support stand 3 is comprised so that height adjustment is possible according to the height of the piping connected to both ends, respectively.

  FIG. 2 is an enlarged cross-sectional view of a connecting portion between the main body tubes 1A and 1B. A housing 4 is attached to the other end of the main body pipe 1A. More specifically, the housing 4 has a cylindrical shape, and the one main body pipe 1A is arranged so that the inner peripheral surface of one main body pipe 1A (more precisely, the main pipe 1a) overlaps with the outer peripheral surface that has dropped to the middle. It is fitted on the housing 4 and fixed in that state.

  In addition, a plurality (two in this embodiment) of annular grooves 4a and 4a are formed on the inner peripheral surface of the housing 4 with a predetermined interval in the axial direction (sliding direction). 5 is mounted. The O-ring 5 has a structure in which an elastic body such as rubber is inserted as a core material in a tube made of Teflon (registered trademark). By taking a large crushing margin, it exhibits a suitable sealing property even under no pressure. Like to do.

  Further, on the inner peripheral surface of the housing 4, a liquid reservoir groove 4 b is formed between the two annular grooves 4 a, 4 a so as to keep the fluid from exuding. Further, the housing 4 communicates with the liquid reservoir groove 4 b. A drain hole 6 is formed so as to penetrate the main body pipe 1A and the housing 4 in the radial direction, and a drain bolt (sealing body) 7 is usually screwed therein.

  A packing presser 9 having a wiper packing 8 attached thereto is attached to the end surface of the housing 4. The wiper packing 8 has an action of wiping off the liquid remaining on the surface of the main body pipe 1B when the main body pipes 1A and 1B slide with each other, for example, with the occurrence of an earthquake. Moreover, the packing presser 9 is attached to the housing 4 so as to be movable in the radial direction. When the main body tubes 1A, 1B slide with each other, for example, when an earthquake occurs, the core of the main body tubes 1A, 1B The structure follows the deviation. Specifically, the packing retainer 9 is attached to the end surface of the housing 4 with, for example, a bolt 10 inserted therein. The through hole for inserting the bolt 10 formed in the packing retainer 9 is longer than the long hole or the bolt 10. The hole has a relatively large diameter, whereby the packing retainer 9 (wiper packing 8 attached to the packing retainer 9) is movable in the radial direction.

  On the other hand, an annular guide member 11 is attached to the other end of the other body tube 1B. This guide member 11 is provided between one main body pipe 1A and the other main body pipe 1B so that the main body pipes 1A and 1B slide while maintaining concentricity. . However, the main body pipes 1A and 1B have a certain degree of elasticity. In particular, in view of the fact that the main body pipes 1A and 1B may be deformed in the radial direction when the main body pipes 1A and 1B slide with each other after an earthquake, for example. A certain amount of clearance is provided between the outer peripheral surface and the inner peripheral surface of one main body pipe 1A.

  However, because of this clearance, the liquid actively enters the space defined by the main body tubes 1A and 1B, the housing 4 and the guide member 11, and the main body tubes 1A and 1B slide with each other, for example, when an earthquake occurs. When moving, unnecessary buffering action occurs. Therefore, a plurality of exhaust pressure relief holes 11a,... Are formed in the guide member 11 at appropriate intervals along the circumferential direction.

  FIG. 3 is an enlarged cross-sectional view of a connecting portion between the main body pipe 1A and the joint pipe 2. In addition, since the structure in the connection part of the main body pipe 1B and the joint pipe 2 is the same as the structure in the connection part of the main body pipe 1A and the joint pipe 2, illustration and description are omitted.

  A spherical bulge portion 1c is formed at one end portion of the main body pipe 1A, while a spherical concave portion 2a is formed at one end portion of the joint pipe 2, and the spherical concave portion is fitted on the spherical bulge portion 1c. As a result, the joint tube 2 can slide (swing) on the spherical surface with respect to the main body tube 1.

  Similarly to the main body tube 1, a plurality of (three in the present embodiment) annular grooves 1 d,... Have a predetermined interval in the circumferential direction (sliding direction) on the surface of the spherical bulge portion 1 c. The O-ring 12 is attached to one of the formed annular grooves (the annular groove at the position farthest from the intermediate portion) 1d. The O-ring 12 has a structure in which an elastic body such as rubber is inserted as a core material in a tube made of Teflon (registered trademark), similar to that in the connecting portion between the main body tubes 1, and a large crushing allowance is obtained. Further, even when no pressure is applied, suitable sealing properties are exhibited.

  The expandable joint according to the present embodiment has the above configuration, specifically, the main body pipes 1A and 1B and the joint pipes 2 and 2 are made of vinyl chloride resin, and the main body pipes 1A and 1B are connected to each other. By using a sealing material having at least a surface layer made of Teflon (registered trademark) as a sealing material in the connecting part and the connecting part between the main body pipes 1A and 1B and the joint pipe 2, respectively, lightness in transportation and construction, Both chemical resistance to chemicals that circulate can be realized. For this reason, for example, it can be effectively utilized for equipment piping in a building in a chemical plant.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

  For example, in the above embodiment, an O-ring using a Teflon tube is used as the sealing material, but an O-ring made entirely of Teflon may be used, or a V-type Teflon packing having a spring may be used. It may be used.

The side view of one Embodiment of the expandable joint which concerns on this invention is shown. It is an expandable joint of the embodiment, Comprising: The expanded sectional view in the connection part of main body tubes is shown. It is an expandable joint of the embodiment, Comprising: The expanded sectional view in the connection part of a main body pipe and a joint pipe is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A, 1B ... Main body pipe, 1a ... Main pipe, 1b ... Restriction pipe, 1c ... Spherical bulge part, 1d ... Circular groove, 2 ... Joint pipe, 2a ... Spherical concave part, 3 ... Support stand, 4 ... Housing, 4a ... Annular groove, 4b ... Liquid storage groove, 5 ... O-ring, 6 ... Drain hole, 7 ... Drain bolt (sealing body), 8 ... Packing for wiper, 9 ... Packing retainer, 10 ... Bolt, 11 ... Guide member, 11a ... Exhaust pressure release hole, 12 ... O-ring

Claims (4)

A pair of main body tubes each having a spherical bulge portion formed at one end portion and the other end portions being linearly slidably coupled, and a spherical concave shape each slidably coupled to the spherical bulge portion of the main body tube. In a telescopic joint provided with a pair of joint pipes formed at one end, the main body pipe and the joint pipe are each made of a vinyl chloride resin, and the connection parts between the main body pipes and the main body pipe and the joint pipe, respectively. As a sealing material in the connecting portion, a sealing material having at least a surface layer made of Teflon (registered trademark) is used, and a wiper that is in sliding contact with the other end of one main body tube and the surface of the other end of the other main body tube The wiper packing is configured to be movable in the radial direction, and the wiper packing is configured to wipe off the liquid remaining on the surface of the other body tube when the body tubes slide with each other. Telescopic Hand.   The connecting portion between the main body tubes is supported by a support base movable on the floor surface in order to prevent the main body tube from being bent due to the weight of the main body tube or the weight of the liquid existing in the main body tube. The expandable joint according to 1.   The sealing material in the connection part of main body pipes and / or the connection part of a main body pipe and a joint pipe is arrange | positioned in multiple numbers with the space | interval in a sliding direction, The Claim 1 or 2 characterized by the above-mentioned. Telescopic joint. An annular guide member for guiding sliding of one main body tube is provided at the other end portion of the other main body tube, and a discharge pressure relief hole is appropriately formed in the guide member. The expandable joint according to any one of claims 1 to 3 .

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