TW202012821A - Joint device, joint structure, and method for manufacturing joint structure - Google Patents

Abstract

This joint device 10 includes: a joint 40 having a connection end portion 41 to which a pipe 11 is connected; a conductive member 42 provided on the connection end portion 41 of the joint 40; and a positioning mechanism that positions the conductive member 42 at the connection end portion 41 of the joint 40. The conductive member 42 is formed in an annular shape. The positioning mechanism has a groove portion 52 which is provided in the outer peripheral surface of the connection end portion 41 of the joint 40 and into which the conductive member 42 can be fitted.

Description

Joint device, joint structure, and manufacturing method of joint structure

The invention relates to a joint device, a joint structure and a manufacturing method of the joint structure.

The joints used in piping such as semiconductor manufacturing equipment are generally mechanically connected with pipes and screw mechanisms. For example, in a state where the pipe is inserted into the joint, the joint and the screw mechanism provided on the outside of the pipe are fastened to connect the joint and the pipe to each other (refer to Patent Document 1).

However, when the above mechanical method is used to connect the joint and the pipe, since the tightening stress of the thread needs to be withstood, the wall thickness of the joint must be thickened, resulting in a large-scale connection structure between the joint and the pipe. In addition, due to vibration, internal pressure, etc., the connection between the joint and the pipe may loosen during the use of piping. Therefore, reinforcement work must be performed to prevent liquid leakage.

Therefore, a method of heating and fusing a joint and a tube using a self-heating fusion welding machine is proposed (refer to Patent Document 2). [Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2009-115154 Patent Document 2: Japanese Patent Laid-Open No. 2007-239973

[Problems to be solved by the invention]

However, according to the fusion method described above, the tube is inserted into the joint, the embedded portion is sandwiched from the outside by the fusion machine, and the fusion machine applies heat to the embedded portion of the joint and the tube to fuse the joint and the tube to each other. Therefore, in the melting work industry, it takes time to wait for the melting machine to heat up, and to transfer the heat of the melting machine to the contact part (fusion part) of the joint and the pipe to melt and melt the contact part, Furthermore, the time for the fusion part of the joint and the tube to cool down. In this way, the connection operation between the joint and the pipe takes more time.

This application was completed in view of the above points, and one of its purposes is to shorten the time taken for the connection operation of the joint and the pipe by the fusion method. [Technical means to solve the problem]

A joint device according to one aspect of the present invention includes: a joint having a connection end for connecting a pipe; and a conductive member provided at the connection end of the joint.

According to this aspect, in a state where the conductive member is disposed at a portion where the connection end of the joint overlaps the tube, the conductive member is heated by electromagnetic induction, and the connection end of the joint and the tube can be fused. In this case, since the heat of the conductive member at the overlapping portion of the connection end of the joint and the tube melts its surroundings, it does not spend time waiting for fusion. Also, it does not waste the waiting time for the conductive member to generate heat by electromagnetic induction. As a result, the time taken for the connection work between the joint and the pipe can be shortened.

The joint device may further include a positioning mechanism that positions the conductive member at the connection end of the joint.

The positioning mechanism may have a connection end portion provided on the joint, and may be fitted into a groove portion of the conductive member.

The conductive member may have a first ring-shaped portion arranged on the outer peripheral side and a second ring-shaped portion arranged on the inner peripheral side, and the first ring-shaped portion and the second ring-shaped portion may be in the axial direction of the joint A part is connected to each other.

The positioning mechanism may include: a convex portion provided at the connection end of the joint; and a hole portion provided in the conductive member and capable of fitting the convex portion.

The convex portion and the hole portion may be formed intermittently in the circumferential direction of the connection end of the joint.

The convex portion may have elasticity in the radial direction of the connection end of the joint.

The positioning mechanism may include a claw portion provided at the connection end of the joint, and may lock the conductive member.

The contact surface of the conductive member with the tube may have an inclined surface with the lowermost end side of the end portion at least at any end portion in the axial direction of the joint.

The conductive member may have a protrusion on the contact surface with the tube.

The connecting end portion of the joint may include: an inclined portion that gradually expands in diameter as it moves away from the front end; and a base portion that connects the inclined portion and the joint body portion; and the conductive member is provided on the base portion.

The joint device may further include a cover member covering an overlapping portion of the connection end of the joint and the tube.

The joint device may further include an index portion that indexes the degree of melting of the tube.

The joint device may further include a reference portion that serves as a reference for the index portion.

According to another aspect of the present invention, the joint structure includes the joint device and the tube, and the tube is connected to the connection end of the joint.

A manufacturing method of a joint structure of another aspect of the present invention is a manufacturing method of a joint structure having a joint and a pipe connected to the connecting end of the joint, and further comprising: disposing a conductive member at the connecting end of the joint and The step of overlapping the tubes; and the step of heating the conductive member by electromagnetic induction to fuse the connecting end of the joint with the tube. [Effect of invention]

According to the present invention, it is possible to shorten the time taken for the connection operation of the joint and the pipe by the fusion method.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In addition, the same symbols are given to the same requirements, and repeated explanations are omitted. In addition, unless otherwise specified, the positional relationship of up, down, left, and right is based on the positional relationship shown in the drawings. Furthermore, the size ratio of the drawings is not limited to those shown. In addition, the following embodiments are examples for explaining the present invention, and the present invention is not limited to the embodiments.

FIG. 1 is an exploded perspective view of a joint structure 1 showing an example of the structure of the joint structure 1 of this embodiment. 2 is a cross-sectional view of the joint structure 1. As shown in FIGS. 1 and 2, the joint structure 1 includes, for example, a joint device 10 and a tube 11 connected to the joint device 10.

The tube 11 is formed of, for example, a fluorine-based (PFA) resin. The tube 11 deforms freely due to its softness. For example, the tube 11 is a round tube with a fixed diameter as shown in FIG. 1. In addition, as shown in FIG. 2, the tube 11 includes a tube body portion 20 and a tube end portion 21 that is larger in diameter than the tube body portion 20 in a state where the joint structure 1 is assembled. The tube end portion 21 includes, for example, a diameter-expanding portion 30 located at the extreme end (front end) of the tube end portion 21, and an inclined portion 31 that connects the diameter-expanding portion 30 and the tube body portion 20, and expands from the tube body portion 20 toward The diameter of the diameter portion 30 gradually increases. In addition, the material of the tube 11 is not particularly limited to fluorine-based resins, and may be other plastic resins such as PP.

The joint device 10 includes, for example, a joint 40 having a connection end 41 of the connection pipe 11; a conductive member 42 attached to the outer peripheral surface of the connection end 41 of the joint 40; and a cover member 43 covering the connection of the joint 40 The overlapping portion of the end 41 and the tube 11.

The joint 40 is formed in, for example, a circular tube shape. The connecting end portion 41 is reduced in diameter compared to the other portion of the joint 40 (the joint body portion 44). The connecting end portion 41 has, for example, an inclined portion 50 which is arranged on the front end side of the joint 40 in the axial direction (X direction in the figure) and gradually expands in diameter as it moves away from the front end; and a base portion 51 which connects the inclined portion 50 and the joint body portion 44. The outer diameter of the base portion 51 is larger than the inner diameter of the tube 11 before assembly. A groove 52 into which the conductive member 42 is fitted is formed on the outer peripheral surface of the base 51. Therefore, the outer peripheral surface of the connecting end portion 41 sequentially includes the inclined surface 60 of the inclined portion 50 gradually increasing in diameter from the front end toward the joint body portion 44, the groove portion 52, and the base surface 61 of the base portion 51 with a fixed diameter.

The groove portion 52 is formed annularly along the outer peripheral surface around the axis of the joint 40. The groove portion 52 is formed in a square concave shape when the joint 40 is cut on a surface including the axis of the joint 40. In this embodiment, the groove 52 constitutes a positioning mechanism for positioning the conductive member 42 at a specific position of the connection end 41 of the joint 40.

The conductive member 42 is formed of a metal such as stainless steel (SUS430), iron steel (SS400), and pre-hardened steel (NAK55). The material of the conductive member 42 is not limited to this, and may be a spring material (SUS304WPB, SUS316WPA), or the like.

As shown in FIGS. 1 and 3, the conductive member 42 is formed in a substantially ring shape. The outer diameter of the conductive member 42 is larger than the inner diameter of the tube 11 before assembly. As shown in FIG. 3, the conductive member 42 has a plate-shaped first annular portion 70 arranged on the outer peripheral side, and a plate-shaped second annular portion 71 arranged on the inner peripheral side. The first annular portion 70 and the second annular portion 71 are connected to each other at one axial end of the joint 40. As a result, the conductive member 42 is formed into a substantially V-shaped cross-sectional shape cut along the plane including the axis of the joint 40.

For example, the thickness of the first annular portion 70 is thicker than that of the second annular portion 71. In the vicinity of the connecting end portion of the first annular portion 70 and the second annular portion 71, an annular groove 72 that opens toward the second annular portion 71 side (inside) is formed. When an external force is applied to the first annular portion 70 from the outside, the first annular portion 70 and the second annular portion 71 are elastically deformed toward each other, and the elastic force is directed toward the first annular portion 70 and the second annular portion 71 works in the direction of leaving each other. That is, the conductive member 42 has elasticity in the radial direction. As shown in FIG. 2, the thickness of the conductive member 42 is greater than the depth of the groove 52. When the conductive member 42 is inserted into the groove 52, the outer portion of the conductive member 42 (the first annular portion 70) protrudes from the groove The outside of the part 52.

The outer peripheral surface of the conductive member 42 has an inclined surface 73 whose front end side is lowered at the end on the front end side of the joint 40 in the axial direction X. When the conductive member 42 is fitted into the groove 52 of the joint 40, the inclined surface 73 and the inclined surface 60 of the connection end 41 of the joint 40 are smoothly continuous.

The tube end 21 can be connected to the outer peripheral surface of the connection end 41 of the joint 40 so as to cover the conductive member 42. At this time, the conductive member 42 is arranged between the connection end 41 and the tube end 21 of the joint 40.

The cover member 43 is formed of, for example, a fluorine-based resin (for example, PTFE). The material of the cover member 43 is not limited to this, and may be silicon or the like. The cover member 43 may be, for example, a material having a higher melting point than the tube 11 or a resin that does not melt even when heated. The cover member 43 is deformable due to its softness.

As shown in FIG. 1, the cover member 43 is formed in a circular tube shape with a fixed diameter, and has a flange portion 83 (shown in FIG. 2) whose inner diameter is reduced at the front end portion. In addition, as shown in FIG. 2, the cover member 43 is deformed to fit the shape near the tube end 21 in a state where it is assembled into the joint structure 1. That is, the cover member 43 has, for example, a reduced diameter portion 80 that covers, for example, the outer peripheral surface of the tube body portion 20, an inclined portion 81 that covers the outer peripheral surface of the inclined portion 31 of the tube end portion 21, and an enlarged diameter portion 82 that covers the tube The outer diameter surface of the enlarged diameter portion 30 of the end portion 21; and the flange portion 83, which covers the front end surface 32 of the pipe end portion 21.

Next, an example of a method of manufacturing the joint structure 1 configured as above will be described. First, as shown in FIG. 1, the tube 11, the joint 40, the conductive member 42 and the cover member 43 are prepared. Next, for example, with the cover member 43 attached to the tube 11, using a jig, as shown in FIG. 2, the conductive member 42 is pressed into a specific position inside the tube 11. At this time, part of the tube 11 and the cover member 43 are enlarged in diameter. Next, the connection end 41 of the joint 40 is inserted inside the tube end 21. At this time, the conductive member 42 is fitted into the groove 52 of the connection end 41 of the joint 40. The conductive member 42 is such that the connection end of the first annular portion 70 and the second annular portion 71 is located on the joint body 44 side of the joint 40. In this way, the conductive member 42 is positioned at a specific position in the axial direction X of the connection end 41 of the joint 40.

In addition, the conductive member 42 is sandwiched between the connection end 41 and the tube end 21 of the joint 40. The circumference of the conductive member 42 is covered by the connection end 41 and the pipe end 21 of the joint 40, and a contact surface A where the connection end 41 of the joint 40 and the pipe end 21 directly contact is formed before and after the conductive member 42. The cover member 43 is covered by the overlapping portion of the connection end 41 of the joint 40 and the tube end 21. FIG. 4 shows the appearance of the joint structure 1 at this time. In addition, the order of assembling the joint 40, the conductive member 42, the tube 11 and the cover member 43 is not limited to this.

Next, as shown in FIG. 5, the outer periphery of the cover member 43 is covered by the electromagnetic induction type welding machine 90. The welding machine 90 is actuated, and the electromagnetic induction of the coil 91 of the welding machine 90 causes the conductive member 42 to generate heat. By the heat of the conductive member 42, the connecting end 41 of the joint 40 around the conductive member 42 and the tube 11 are melted and fused. Subsequently, the welding machine 90 is stopped, and the connection work between the joint 40 and the pipe 11 is ended. In addition, the fusing machine 90 is not limited to this example, as long as the conductive member 42 generates heat by electromagnetic induction, it may have another structure.

According to the present embodiment, in a state where the connection end 41 of the joint 40 is embedded in the tube 11 and the conductive member 42 is disposed at the overlapping portion of the connection end 41 of the joint 40 and the tube 11, electromagnetic induction can be used The conductive member 42 generates heat, and the connection end 41 of the joint 40 and the tube 11 are fused. Thereby, since the heat of the conductive member 42 existing at the overlapping portion of the connection end portion 41 of the joint 40 and the tube 11 is fused around it, it takes no time to fuse it. Moreover, it does not waste time for the conductive member 42 to generate heat by electromagnetic induction. Therefore, the time taken for the connection work between the joint 40 and the pipe 11 can be shortened. In particular, according to the present embodiment, since the heat existing in the conductive member 42 between the connection end 41 of the joint 40 and the tube 11 melts around it, the welding time can be significantly shortened. In addition, since the conductive member 42 becomes a heat source, it is possible to apply heat to only the portion to be fused by providing the conductive member 42 at a desired position.

Since the joint device 10 includes the groove portion 52 for positioning the conductive member 42 at the connection end 41 of the joint 40, the position of the conductive member 42 which is the position of the heat source to be fused can be fixed to the connection end 41 Niche. As a result, the fusion of the joint 40 and the tube 11 can be performed stably and efficiently.

The conductive member 42 has a first annular portion 70 arranged on the outer peripheral side and a second annular portion 71 arranged on the inner peripheral side, and the first annular portion 70 and the second annular portion 71 are on the axis of the joint 40 Connected to the ends. Thereby, when the conductive member 42 is provided between the tube end 21 and the connection end 41, a repulsive force in the radial direction is generated in the conductive member 42 and the tube 11 and the joint 40 are pressed. With this, the conductive member 42 is completely positioned. In addition, the adhesion between the conductive member 42 and the tube 11 and the joint 40 is improved, and the heat of the conductive member 42 is effectively transferred to the tube 11 and the joint 40, and fusion is preferably performed. Furthermore, the volume or weight of the conductive member 42 can be reduced.

The conductive member 42 has an inclined surface 73 at which the terminal side of the end portion is lowered at least at any one end of the joint 40 in the axial direction X of the contact surface with the tube 11. As a result, at the end of the joint 40 of the conductive member 42 in the axial direction X, the adhesion between the conductive member 42 and the tube 11 is improved, and heat transfer between the conductive member 42 and the tube 11 is effectively performed.

The connecting end portion 41 of the joint 40 has an inclined portion 50 that gradually expands in diameter from the front end, and a base portion 51 that connects the inclined portion 50 and the joint body portion 44, and the conductive member 42 is provided on the base portion 51. Thereby, the contact area between the connection end 41 and the tube 11 is sufficiently ensured, and the fusion of the joint 40 and the tube 11 is sufficiently performed. In addition, since the conductive member 42 is far from the front end of the connection end 41, the conductive member 42 is not exposed in the inner area of the tube 11 or the joint 40. Also, ensuring the distance between the conductive member 42 and the front end portion of the joint 40 (the portion of the tube 11 or the joint 40 exposed in the flow channel area) can suppress the formation of a flange (bump) at the front end portion of the joint 40 due to fusion.

Since the joint device 10 is provided with a cover member 43 covering the overlapping portion of the connection end 41 of the joint 40 and the tube 11, the joint structure 1 can be directly handled by hand after fusion, which can further shorten the time required for the connection operation, and even When melting, a part of the tube 11 melts, and the beautiful appearance of the joint structure 1 can also be ensured.

The positioning mechanism of the connecting end portion 41 of the conductive member 42 and the joint 40 is not limited to the above-mentioned embodiment. For example, as shown in FIG. 6, the conductive member 42 is formed into a tubular shape having a width in the axial direction X of the joint 40, a convex portion 100 is provided on the outer peripheral surface of the connection end 41 of the joint 40, and a fitting is provided on the conductive member 42 The hole 101 of the convex portion 100. In the above case, the convex portions 100 are provided at a plurality of locations at regular intervals along the circumferential direction of the connecting end portion 41 of the joint 40, for example. The convex portion 100 has a flat upper surface 100a. The convex portion 100 has a height greater than the thickness of the conductive member 42. The hole portions 101 are provided at a plurality of locations with the same number as the convex portions 100 at equal intervals along the circumferential direction of the conductive member 42. The hole 101 penetrates in the thickness direction of the conductive member 42. In addition, as shown in FIG. 7, at both ends of the outer peripheral surface of the conductive member 42 in the axial direction X, inclined surfaces 110 and 111 having the lowermost end are formed. The inclined surface 110 of the conductive member 42 near the front end of the joint 40 is smoothly continuous with the inclined surface 60 of the connection end 41 of the joint 40 when the conductive member 42 is fitted into the connection end 41 of the joint 40.

In the above case, as shown in FIG. 7, when the conductive member 42 is fitted into the connection end 41 of the joint 40, the convex portion 100 is fitted into the hole 101, and the conductive member 42 is positioned at the connection end of the joint 40 41. In addition, the upper surface 100a of the convex portion 100 of the joint 40 directly contacts the tube 11. Then, the conductive member 42 is heated by the electromagnetic induction type welding machine 90 to fuse the connecting end 41 of the joint 40 around it and the tube 11.

According to this example, the positioning of the connection end 41 of the conductive member 42 and the joint 40 can be appropriately performed, and as a result, the fusion of the connection end 41 of the joint 40 and the tube 11 can be appropriately performed. In addition, since the conductive member 42 has a hole 101 through which the convex portion 100 penetrates, the convex portion 100 is also fused, the contact area of the connection end 41 of the joint 40 and the tube 11 increases, and the connection end 41 of the joint 40 The fusion strength with the tube 11 is improved.

The convex portion 100 in the above embodiment may be, for example, a spring plate having elasticity in the radial direction as shown in FIG. 8. The shape of the spring plate is not particularly limited, and may be formed into an upward convex arch shape. In this case, as shown in FIG. 9, when the conductive member 42 is fitted into the connection end 41 of the joint 40 and the convex portion 100 is fitted into the concave portion 101, the convex portion 100 presses the tube 11 by the elastic force.

According to this example, since the convex portion 100 of the connection end 41 of the joint 40 presses the tube 11 with the force of the spring, the adhesion between the connection end 41 of the joint 40 and the tube 11 is improved, and as a result, the connection end 41 of the joint 40 The fusion strength with the tube 11 is further improved.

Furthermore, the positioning mechanism of the connecting end 41 of the conductive member 42 and the joint 40 may have a claw that can be locked to the conductive member 42 as shown in FIG. Department (locking section) 120. In this case, for example, the claw portion 120 is provided at a plurality of locations along the circumferential direction of the outer peripheral surface of the connection end portion 41 of the joint 40. The upper surface of the claw portion 120 has an inclined surface 121 that gradually rises from the front end side of the connection end portion 41 of the joint 40 toward the joint body portion 44 side. The conductive member 42 is formed, for example, in a ring shape having no holes and having a thickness. As shown in FIG. 11, for example, the upper surface of the conductive member 42 includes: a flat surface 130 that is continuously connected to the inclined surface 121 of the claw portion 120 when the conductive member 42 is fitted into the connection end 41 of the joint 40; and The inclined surface 131 is gradually lowered toward the end surface on the side of the joint body portion 44.

In addition, the conductive member 42 is fitted into the connection end 41 of the joint 40 and locked to the claw 120, and is disposed between the tube 11 and the connection end 41 of the joint 40. Subsequently, the conductive member 42 is heated by the electromagnetic induction type welding machine 90, and the connecting end 41 of the joint 40 and the tube 11 are fused.

According to the above example, since the contact area between the connection end 41 of the joint 40 and the tube 11 is ensured to be large, the fusion strength of the connection end 41 of the joint 40 and the tube 11 is improved.

In the above-mentioned embodiment, as shown in FIG. 12, the conductive member 42 may include the protrusion 140 on the contact surface with the tube 11. In the above case, since the contact area between the conductive member 42 and the tube 11 is enlarged, it is easy to transfer the heat of the conductive member 42 that generates heat by electromagnetic induction to the tube 11. As a result, fusion of the connection end 41 of the joint 40 and the tube 11 can be performed more appropriately. In addition, the fused front tube 11 can be prevented from coming off from the connection end 41 of the joint 40. In addition, all the conductive members 42 described in the above embodiments may include protrusions 140. The shape, position, and number of protrusions 104 at that time are not limited thereto.

As shown in FIG. 13, the joint device 10 may include an index portion 150 that indexes the degree of fusion of the tube 11. The index portion 150 is provided on, for example, the outer peripheral surface of the cover member 43 or the joint body portion 44. The index part 150 has, for example, a protrusion 151. The protrusion 151 melts due to the heat of the conductive member 42 during electromagnetic induction, and the degree of fusion of the protrusion 151 corresponds to the degree of fusion of the joint 40 and the tube 11. With this, the operator can index the degree of melting of the tube 11 by visually inspecting the melting of the protrusion 151. In addition, the joint device 10 may include a reference portion 152 that serves as a reference for the index portion 150. The reference portion 152 is provided on, for example, the outer peripheral surface of the joint body portion 44 or the cover member 43. The reference portion 152 has, for example, the same shape as the index portion 150, and has a protrusion 153. The reference portion 152 is provided at a position farther from the conductive member 42 than the index portion 150. As a result, the index unit 150 can be indexed while observing the reference unit 152. Therefore, the time when the conductive member 42 is heated by electromagnetic induction can be appropriately determined. In addition, when both the index portion 150 and the reference portion 152 are provided on the outer peripheral surface of the joint body portion 44, the index portion 150 and the reference portion 152 can be arranged along the axial direction X of the outer peripheral surface of the joint body portion 44 . In addition, when the index portion 150 and the reference portion 152 interfere with the cover member 43, as shown in FIG. 14, a cutout 43a may be provided in the cover member 43, and an index portion may be provided on the surface of the joint body portion 44 exposed by the cutout 43a 150 or reference section 152. In addition, the index portion 150 may be set at a position where the timing protrusion 151 is fused when the fusion of the joint 40 and the tube 11 is appropriately performed. In addition, the reference portion 152 may be set at a position where the protrusion 153 melts at the timing when the flange is generated due to excessive fusion.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above examples. Those in this industry are obviously within the scope of the ideas described in the scope of the patent application, and various modifications or amendments are conceivable. Of course, it should be understood that they also fall within the technical scope of the present invention.

For example, in the above embodiments, the conductive member 42 has inclined surfaces 73, 110, 111, and 131 at one or both ends of the outer circumferential surface in the axial direction, but the above-mentioned inclined surfaces may be optional. In addition, the shape or number of the conductive member 42 is not limited to those of the above-mentioned embodiment, for example, the conductive member 42 may not be formed in a ring shape, and may be provided in plural. The ring-shaped conductive member 42 may be in a coil shape wound around the outer peripheral surface of the connection end 41. The coil can also be a coil spring.

In the above embodiment, the joint structure 1 is the one where the tube 11 is fitted to the outer peripheral surface of the connecting end 41 of the joint 40, as shown in FIG. 15, for example, the tube 11 is fitted to the inner peripheral surface of the connecting end 41 of the joint 40 By. In this case, for example, the conductive member 42 is disposed between the connection end 41 of the tube 11 and the joint 40 (between the outer circumferential surface of the tube 11 and the inner circumferential surface of the connection end 41). Furthermore, as shown in FIG. 16, the conductive member 42 may be provided on the outer peripheral surface of the overlapping portion between the connection end 41 of the joint 40 and the tube 11.

As shown in FIGS. 17 to 19, the joint structure 1 may be such that the connecting end 41 of the pipe 11 and the joint 40 are fitted to each other, and under this fitting, in the overlapping portion of the connecting end 41 of the pipe 11 and the joint 40 A conductive member 42 is provided on the outer peripheral surface of the connection end 41 of the joint 40. In this case, for example, an annular recessed fitting portion 160 is provided on the end surface of the connecting end portion 41 of the joint 40, and the front end of the tube 11 is fitted into the fitting portion 160. A ring-shaped conductive member 42 is fitted on the outer peripheral surface of the connection end 41. A stopper 161 is provided on the outer peripheral surface of the connection end portion 41 to abut the end surface of the embedded conductive member 42 in the axial direction X on the joint 40 side. The conductive member 42 can be positioned by the stopper 161. A ring-shaped cover member 162 covering the conductive member 42 is provided at the overlapping portion of the connection end 41 of the tube 11 and the joint 40. The cover member 162 is provided with a flange portion 163 whose end portion on the side of the tube 11 is reduced in diameter. As shown in FIG. 19, the flange portion 163 covers the end surface of the conductive member 42 on the tube 11 side and the end surface of the connection end portion 41 on the tube 11 side. Thereby, the upper and lower surfaces of the conductive member 42 and both end surfaces of the axial direction X are covered by the connection end 41 and the cover member 162. In addition, the material of the cover member 162 may be the same as the cover member 43 described above, for example.

In the above example, the conductive member 42 is heated by electromagnetic induction, so that the connection end 41 of the joint 40 around the conductive member 42 and the tube 11 are melted and fused.

The conductive member 42 may be embedded in the connection end 41 of the joint 40 or may be fixed in advance to the connection end 41 of the joint 40. The positioning mechanism of the connecting end portion 41 of the conductive member 42 and the joint 40 is not limited to the above-mentioned embodiment. Also, the positioning mechanism may not be provided. The shape and the like of the cover member 43 are not limited to those of the above embodiment. Furthermore, there is no cover member 43. The joint 40 is not limited to the above embodiment, and the present invention can be applied to all well-known joints such as L-shaped and T-shaped. The number of connecting ends 41 of the joint 40 is not limited to one, but may be plural. [Industry availability]

The present invention is useful for shortening the time spent in the connection operation of the joint and the pipe by the fusion method.

1: Joint structure 10: Joint device 11: Tube 20: Tube body 21: tube end 30: Enlarging part 31: Inclined part 32: front face 40: Connector 41: Connect the end 42: Conductive member 43: cover member 43a: incision 44: Joint body 50: inclined part 51: base 52: Groove 60: inclined surface 61: base surface 70: 1st ring 71: 2nd ring 72: annular groove 73: inclined surface 80: reduced diameter section 81: inclined part 82: Enlarging part 83: flange part 90: welding machine 91: coil 100: convex part 100a: upper surface 101: Hole 110: inclined surface 111: inclined surface 120: claw (locking part) 121: inclined surface 130: flat surface 131: inclined surface 140: protrusion 150: Index Department 151: protrusion 152: Reference Department 153: protrusion 160: fitting part 161: Stopper 162: cover member 163: Flange A: contact surface X: axial

FIG. 1 is an exploded perspective view showing an example of the structure of a joint structure. Figure 2 is a cross-sectional view of the joint structure. Fig. 3 is a diagram showing a cross section of a conductive member. Figure 4 is an external view of the joint structure. Fig. 5 is a cross-sectional view of a joint structure equipped with a fusion machine. FIG. 6 is an exploded perspective view showing another structure of a joint structure in which a convex portion is present at the connecting end of the joint. 7 is a cross-sectional view of the joint structure. FIG. 8 is an exploded perspective view showing another configuration of the joint structure of the joint end of the joint being a spring plate. 9 is a cross-sectional view of the joint structure. Fig. 10 is an exploded perspective view showing another configuration of a joint structure having claws at the connecting end of the joint. 11 is a cross-sectional view of the joint structure. 12 is a cross-sectional view showing another configuration of a joint structure in which a protrusion is present on the surface of a conductive member. 13 is a cross-sectional view of a joint structure having an index portion and a reference portion. 14 is an external view of the joint structure when the cover member is provided with a cutout. 15 is a cross-sectional view showing an example of a joint structure when a tube is inserted inside the connecting end of the joint. FIG. 16 is a cross-sectional view showing an example of a joint structure when a tube is inserted inside the connecting end of the joint. 17 is an exploded perspective view showing an example of the structure of the joint structure. Fig. 18 is an exploded sectional view showing an example of the structure of the joint structure. Figure 19 is a cross-sectional view of the joint structure.

1: Joint structure

10: Joint device

11: Tube

40: Connector

41: Connect the end

42: Conductive member

43: cover member

44: Joint body

50: inclined part

51: base

52: Groove

60: inclined surface

61: base surface

70: 1st ring

71: 2nd ring

73: inclined surface

X: axial

Claims (16)

A joint device comprising: a joint having a connecting end for connecting a pipe; and The conductive member is provided at the connection end of the above-mentioned joint. The joint device according to claim 1, further comprising: a positioning mechanism that positions the conductive member at the connection end of the joint. The joint device according to claim 2, wherein the positioning mechanism has a connection end portion provided at the joint and can be inserted into a groove portion of the conductive member. The joint device according to claim 3, wherein the conductive member has a first ring-shaped portion disposed on the outer peripheral side and a second ring-shaped portion disposed on the inner peripheral side, and the first ring-shaped portion and the second ring The parts are connected to each other at a part of the axial direction of the joint. The joint device according to claim 2, wherein the positioning mechanism includes: a convex portion provided at the connection end of the joint; and a hole portion provided at the conductive member and capable of fitting the convex portion. The joint device according to claim 5, wherein the convex portion and the hole portion are formed intermittently in the circumferential direction of the connection end of the joint. The joint device according to claim 5, wherein the convex portion has elasticity in the radial direction of the connection end of the joint. The joint device according to claim 2, wherein the positioning mechanism has a claw portion which is provided at the connection end of the joint and can lock the conductive member. A joint device according to any one of claims 1 to 8, wherein the contact surface of the conductive member with the tube is at least any one end portion of the axial direction of the joint portion, and has an inclination of the lowermost end of the end portion surface. The joint device according to any one of claims 1 to 8, wherein the conductive member has a protrusion on a contact surface with the tube. The joint device according to any one of claims 1 to 8, wherein the connecting end portion of the above-mentioned joint has: an inclined portion that gradually expands in diameter as it moves away from the front end; and a base portion that connects the above-mentioned inclined portion and the joint body portion; and The conductive member is provided on the base. The joint device according to any one of claims 1 to 8, further comprising a cover member for covering an overlapping portion of the connection end of the joint and the tube. The joint device according to any one of claims 1 to 8, further comprising an index portion that indexes the degree of melting of the tube. The joint device according to claim 13 further includes a reference unit which becomes a reference of the above-mentioned index unit. A joint structure provided with the joint device according to any one of claims 1 to 8; and Tube; and The tube is connected to the connection end of the joint. A manufacturing method of a joint structure, which is a manufacturing method of a joint structure having a joint and a pipe connected to a connecting end of the joint, and having: The step of arranging the conductive member at the overlapping portion of the connection end of the joint and the tube; and The step of heating the conductive member by electromagnetic induction to fuse the connecting end of the joint with the tube.

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