JP2020041560A - Fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint capable of improving the efficiency of work for connecting a tubular body such as a pipe and preventing forgetting to apply an adhesive. SOLUTION: A tubular joint portion (10) having an open end portion into which a tube end portion (2a) of a tubular body to be connected can be fitted in a coaxial state is attached to an inner peripheral surface of the joint portion (10). The container (40) is provided with a container (40) in which the adhesive is sealed, and the container (40) is crushed by an external force applied to the container (40) from the tubular body fitted in the joint portion (10), and the adhesive is released. leak. [Selection diagram] Fig. 1

Description

  TECHNICAL FIELD The present invention relates to a joint for joining pipe ends of a tubular body.

  In recent years, the use of crosslinked polyethylene pipes as water supply and hot water supply pipes has rapidly spread. A crosslinked polyethylene pipe is a so-called resin pipe, and is widely used because it is easy to construct by simply inserting it into a joint without the need for an adhesive or brazing, and has excellent flexibility and heat resistance. In a joint for a cross-linked polyethylene pipe, an O-ring (round), generally referred to as an O (O) ring, is attached to a groove provided on an inner peripheral surface thereof and is appropriately compressed. The cross-linked polyethylene tube is fixed. Since the pipe can be fixed by such a simple mechanism, the installation of the pipe is easy. However, there is an uneasy factor in the durability of the fixed portion, and there is a fear that a problem may occur due to long-term use. Another disadvantage is that the joint for the crosslinked polyethylene pipe is expensive.

  Vinyl chloride pipes are cheaper than cross-linked polyethylene pipes and lighter than metal pipes, and thus have been widely used as water supply pipes. Polyvinyl chloride, which is a material for PVC pipes, is particularly excellent in workability among plastic materials and is used in a wide range of fields as a general-purpose resin.PVC pipes are also excellent in strength and weather resistance. Widespread. As the joint for the polyvinyl chloride pipe, a polyvinyl chloride joint made of the same polyvinyl chloride is used, and is generally connected to the vinyl chloride pipe using a dedicated adhesive. Because the connection is made using an adhesive, a stronger fixation is possible than the connection between the crosslinked polyethylene pipe and the joint using an O-ring.

  The connection between the polyvinyl chloride pipe and the joint using an adhesive is performed by applying an adhesive to each of the portions where the vinyl chloride pipe and the joint are joined, and fitting the vinyl chloride pipe into the joint. Therefore, when connecting the PVC pipe and the joint at a plurality of work places, bring the adhesive and a brush for applying the adhesive to the work place, apply the adhesive, and connect the PVC pipe and the joint. The insertion will be repeated. At this time, the trouble of applying the adhesive not only lowers the working efficiency but also may cause forgetting to apply the adhesive. If the application of the adhesive is forgotten, a problem such as water leakage occurs at the connection portion, and a great deal of trouble is required to deal with the problem.

  As a method of suppressing a decrease in work efficiency due to the application of an adhesive as described above, Japanese Patent Application Laid-Open No. 2009-257450 (Patent Document 1) discloses a method in which a capsule or bag body in which an adhesive is sealed is provided on the inner peripheral surface of a joint body. A joint structure in which a groove for storing is formed and the capsule or the bag body is stored in the groove in advance is disclosed. As the pipe for piping is inserted into the joint, the coating of the capsule or the bag is torn by the edge of the outer peripheral end face of the pipe, and the enclosed adhesive flows out, so that the application of the adhesive and the insertion of the pipe are performed in parallel. It is said that work efficiency is improved.

JP 2009-257450 A

  However, in the joint structure of Patent Document 1, since a groove is provided for accommodating a capsule or a bag body in which an adhesive is sealed, a new groove is provided on the inner peripheral surface of the joint body when manufacturing the joint. Required steps. In addition, after the capsule or bag film is broken and the enclosed adhesive flows out, a gap may be formed in the groove, and if a gap is formed, water leakage may occur from the gap. Become.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joint that can improve the efficiency of work for connecting a tubular body such as a pipe and prevent forgetting to apply an adhesive. It is in.

  The joint of the present invention has a tubular joint having an open end into which a tube end of a tubular body to be connected can be coaxially fitted, and is attached to an inner peripheral surface of the joint, and an adhesive is sealed therein. Wherein the container is crushed by an external force applied to the container from the tubular body fitted into the joint portion, so that the adhesive can flow out.

  A container enclosing the adhesive is stuck on the inner peripheral surface, the pipe end of the pipe is fitted, and the pipe end comes into contact with the container, causing the container to break and the enclosed adhesive to flow out. It is not necessary to apply an adhesive to pipes and joints before fitting. Further, since the container is directly adhered to the inner peripheral surface of the joint, an operation such as providing a groove is unnecessary, and the groove does not become a gap.

  The outer shape of the container may be granular, and the plurality of containers may be attached to the inner peripheral surface of the joint. By using a plurality of containers, stronger adhesion can be achieved.

  The container is stuck at a position on the inner peripheral surface of the joint at equal intervals along the circumferential direction of the joint, and at equal intervals along the center axis direction of the joint. It can be. By sticking the containers at equal intervals, the adhesive can be spread evenly at the places where the pipes and fittings are fitted.

  The open end of the joint may be covered with a peelable seal. For example, there are many places where water pipes are buried underground, and when performing connection work with a joint to a water pipe buried underground, if the work is performed with the open end to insert the water pipe open, Before the water pipe is inserted into the joint, earth and sand may enter the joint from the open end. If a seal is attached to the opening end, and the seal is peeled off immediately before the insertion of the water pipe, and the water pipe is inserted, the intrusion of earth and sand can be prevented.

  In at least a part of the inner peripheral surface of the joint, the inside diameter of the joint may be reduced from the opening end toward the fitting direction of the tubular body. By forming the joint portion in such a shape, it is not necessary to provide a wall (step) which is a limit of insertion of the tubular body.

  ADVANTAGE OF THE INVENTION According to this invention, when the pipe end part of a tubular body is inserted, the container stuck on the inner peripheral surface of a joint is torn, and the enclosed adhesive flows out. Therefore, it is not necessary to apply an adhesive to the pipe and the joint before fitting, and it is not necessary to provide a groove for accommodating the container.

It is sectional drawing in the center-axis direction of the example of the joint which concerns on this invention. FIG. 2 is a front view when the joint shown in FIG. 1 is viewed from a direction indicated by an arrow A in FIG. 1. FIG. 2 is a cross-sectional view in a center axis direction in a state where a pipe is fitted into the joint illustrated in FIG. 1. FIG. 2 is a cross-sectional view in a center axis direction in a state where a pipe is fitted into the joint shown in FIG. 1 and a container near an open end is torn. It is sectional drawing in the center axis direction of the example of the joint which stuck the container of other forms. It is sectional drawing in the center axis direction of the example of the joint which has the shape which the inside diameter of the joining part reduced diameter. FIG. 7 is a cross-sectional view in a center axis direction in a state where a pipe is fitted into the joint illustrated in FIG. 6.

  A joint according to an embodiment of the present invention will be described with reference to the drawings. In addition, each part in the drawings is illustrated in a different size from the actual size for easy understanding.

  FIG. 1 shows an example of the joint according to the present invention. FIG. 1 is a cross-sectional view in the central axis direction of the joint. As shown in FIG. 1, the joint 1 of the present embodiment has an inner periphery having substantially the same size as the outer periphery of the pipe 2 to be connected (see FIG. 3) and an outer periphery having a radius larger than the inner periphery by a predetermined value D1. It has a joint portion 10 having a length L1, an inner periphery approximately the same size as the inner periphery of the pipe 2, and an outer periphery the same size as the outer periphery of the joint portion 10, and has a fixed length (for example, a predetermined value L2). It has a stepped portion 20 which is connected to the joining portion 10 and has an inner periphery having the same size as the inner periphery of the stepped portion 20 and an outer periphery whose radius is larger than the inner periphery by a predetermined value D2, and functions as a male screw. The outer peripheral surface is formed with a threaded portion, and is formed from a stepped portion 20 and a screwed portion 30 connected to the stepped portion 20. The central axes of the joint portion 10, the step portion 20, and the screwing portion 30 coincide with each other as the axis C. Further, the joint 1 and the pipe 2 are made of polyvinyl chloride, and the pipe 2 is inserted from an end face (opening end) that is open to the outside, from both ends of the joint 10, and is connected to the joint 10. The wall 11 is inserted up to the step 11 at the boundary with the step 20. The screw portion 30 is joined to a metal joint connected to another pipe. The inner peripheral surface of the metal joint is threaded so as to function as a female screw, and the inner periphery of the metal joint and the outer periphery of the screwed portion 30 are the same size. Joined by screwing. Note that the outer periphery of the step portion 20 does not need to be the same size as the outer periphery of the joint portion 10 and need not be circular.

  A plurality of granular containers 40 are adhered to the inner peripheral surface 12 of the joint 10. An exclusive adhesive for connecting the vinyl chloride pipe is sealed in the container 40, and the container 40 is made of a material that can be broken when a predetermined pressure or more is applied from the outside. It is stuck directly on the inner peripheral surface 12 in a slightly raised form. FIG. 2 is a front view when the joint 1 is viewed from the direction of arrow A in FIG. As shown in FIG. 2, the container 40 has three axes intersecting at an axis C and arranged at an equal angle (60 °) on a vertical plane orthogonal to the axis C (hereinafter, simply referred to as “vertical plane”). It is stuck at a position where X1, X2 and X3 intersect with the inner peripheral surface 12. That is, the container 40 is adhered to the position of the vertex of the regular hexagon inscribed in the inner peripheral surface 12 when cut along the vertical plane. Further, as shown in FIG. 1, in the central axis direction of the joint portion 10, the container 40 is opened on an axis on the inner peripheral surface 12 parallel to the central axis direction (hereinafter, referred to as “installation axis”). It is affixed to a position at an equal interval of the width W from a position away from the end by the width W0. In the case of FIG. 1, three containers 40 are attached on one installation axis, so that 18 containers 40 are attached on the entire joint portion 10. The width W0 and the width W may have the same value or different values. Further, the width W0 and / or the width W may be changed for each installation axis. For example, between adjacent installation axes, the positions of the containers 40 may be shifted by a width W / 2 in the central axis direction, and the containers 40 may be stuck alternately. On the vertical surface, the container 40 may be stuck at a vertex position such as a square or a regular octagon instead of a regular hexagon, and may not be a regular polygon. Further, even on the installation axis, the intervals are not equal but irregular, for example, the interval between the containers 40 near the center of the joint 10 is reduced to prevent leakage of the adhesive from both ends of the joint 10. The container 40 may be adhered to the container.

  FIG. 3 is a cross-sectional view in the center axis direction in a state where the pipe 2 is inserted from the open end of the joint 1, the pipe end 2 a of the pipe 2 reaches the wall 11, and the pipe 2 and the joint 1 are fitted. is there. The outer circumference of the pipe 2 and the inner circumference of the joint 10 are substantially the same size, and the inner circumference of the pipe 2 and the inner circumference of the screwing section 30 are substantially the same size. There is an extremely small gap between the outer peripheral surface of the pipe 2 where the joint portion 10 is fitted and the inner peripheral surface of the joint portion 10, and the adhesive flowing out of the container 40 is dense in the gap. Hardened.

  The mode of adhesion between the joint 1 and the pipe 2 will be described.

  The pipe end 2a of the pipe 2 is inserted from the open end of the joint 1, the pipe end 2a comes into contact with the container 40 closest to the open end, and the pressure exceeding the limit that the container 40 can withstand without being crushed is applied. As a result, as shown in FIG. 4, the container 40 is torn (opened) and the enclosed adhesive flows out. The adhesive that has flowed out spreads between the outer peripheral surface of the pipe 2 and the inner peripheral surface 12 of the joint portion 10 (hereinafter, referred to as “fitting gap”) due to the frictional force due to the insertion of the pipe 2. Even when the container 40 is not broken by the contact of the tube end 2a, if the tube end 2a is further inserted toward the wall 11 and the container 40 is pressed into the fitting gap, a pressure higher than the pressure by the tube end 2a is generated. Since it hangs on the container 40, the container 40 is torn.

  As the tube end 2a is inserted toward the wall 11, the tube end 2a comes into contact with the container 40 in the order closer to the open end, and is sealed in the container 40 in the same manner as described above. The glue flows out. When the pipe end 2a reaches the wall 11, all the containers 40 are torn, and the enclosed adhesive spreads into the fitting gap. After a certain period of time, the adhesive hardens, and the joint 1 and the pipe 2 Are firmly adhered.

  In order to realize the above aspect, it is necessary to adjust the material and size of the container 40 so that the container 40 is broken at least when it is press-fitted into the fitting gap. Further, the container 40 must be adhered to the inner peripheral surface so that the container 40 does not peel off from the inner peripheral surface 12 when the pipe end 2a comes into contact.

  In this manner, the container 40 in which the adhesive is sealed is pre-adhered to the inner peripheral surface 12 of the joint portion 10, and the container 40 is broken according to the insertion of the pipe 2, and the sealed adhesive flows out. There is no need to apply agents to pipes and fittings. Further, since the container 40 is directly adhered to the inner peripheral surface 12, there is no need to provide a groove or the like for accommodating the container 40.

  In addition, when a water pipe is assumed as the pipe 2 and a water pipe for joining the joint 1 is buried underground, the joining operation is performed by excavating earth and sand. In this case, earth and sand may enter the joint 1 from the opening end. Therefore, it is better to close the open end until immediately before inserting the water pipe into the open end. For example, a seal that can be easily removed by hand that covers the entire open end is attached to the open end. Then, by removing the seal immediately before inserting the water pipe and inserting the water pipe, it is possible to prevent the intrusion of earth and sand.

  In the above-described embodiment, the container 40 has a granular shape. However, for example, as shown in FIG. The inner circumference of the joint 10 has the same size from the opening end to the wall 11 and the pipe 2 is inserted until it reaches the wall 11, but the joint 10 is inserted as shown in FIG. Alternatively, the pipe 2 and the joint 1 may be fitted in such a shape that the inner diameter is reduced slightly from the opening end toward the wall 11. In this case, as shown in FIG. 7, the insertion of the pipe 2 stops at a position where the outer circumference of the pipe 2 becomes smaller than the inner circumference of the joint 10, so that the wall 11 becomes unnecessary. The screwing portion 30 may be formed in the same form as the joining portion 10, and the container 40 may be attached to the inner peripheral surface of the screwing portion 30 to connect the pipe. Further, it is assumed that the joint 1 is made of polyvinyl chloride assuming that the pipe is a polyvinyl chloride pipe, but a joint made of another material may be used as long as it can be joined with an adhesive.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is suitable for joining a joint to a pipe such as a water pipe using an adhesive.

DESCRIPTION OF SYMBOLS 1 Joint 2 Pipe 2a Pipe end part 10 Joint part 11 Wall 12 Inner peripheral surface 20 Step part 30 Screw part 40 Container

Claims (5)

A tubular joint having an open end in which a tube end of a tubular body to be connected can be coaxially fitted,
Attached to the inner peripheral surface of the joining portion, a container in which an adhesive is enclosed,
A joint, wherein the container is crushed by an external force applied to the container from the tubular body fitted into the joint, and the adhesive can flow out.   The joint according to claim 1, wherein an outer shape of the container is granular, and a plurality of the containers are attached to an inner peripheral surface of the joint.   The container is stuck to a position on the inner peripheral surface of the joint at equal intervals along the circumferential direction of the joint, and at equal intervals along the center axis direction of the joint. Item 3. The joint according to Item 2.   The joint according to any one of claims 1 to 3, wherein the open end of the joint is covered with a peelable seal.   The inner diameter of the joining portion is reduced from the opening end toward the fitting direction of the tubular body in at least a part of an inner peripheral surface of the joining portion. Fittings.

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