JP5111212B2 - Water pipe connector - Google Patents

Description

  The present invention relates to a water pipe connecting tool for connecting a water pipe made of synthetic resin such as a water pipe or a hot water pipe to a water heater, a header, a steel pipe or the like.

  Conventionally, connecting tools have been used to connect the water pipes to water heaters, headers, steel pipes and the like. For example, as shown in FIG. 11, the water pipe is inserted in the connector main body 2 formed in a substantially cylindrical shape of the metal connector 61, and then the metal moving sleeve 41 is axially disposed on the outer peripheral surface. It can be connected to the connection tool 61 by moving. That is, in FIG. 11, the connector main body 2 of the connector 61 includes a screwed portion 5 that is screwed to a header or the like at one end, and is inserted into a connecting end portion 52 of a water pipe 51 made of synthetic resin at the other end. An insertion tube portion 6 is provided. The outer diameter of the inner tube portion 6 is formed slightly larger than the inner diameter of the water pipe 51, and the inner diameter of the moving sleeve 41 is formed slightly larger than the outer diameter of the water pipe 51. In order to connect the water pipe 51 to the connector 61, as shown in FIG. 11A, the movable sleeve 41 is extrapolated to the water pipe 51 to a position slightly separated from the connection end 52. Next, since the water pipe 51 is formed to be slightly smaller than the outer diameter of the inner tube portion 6 and is generally formed of a hard resin material, the extrapolation as it is to the inner tube portion 6 of the connector main body 2 is performed. Since it is difficult, after expanding the diameter so that the inner diameter of the connection end 52 of the water conduit 51 becomes larger than the outer diameter of the inner tube portion 6 of the connector body 2 using a diameter expansion tool, The connection end portion 52 is extrapolated to the insertion tube portion 6 of the connector body 2. After the connection end portion 52 of the water conduit 51 is extrapolated to the insertion tube portion 6 of the connection tool body 2, the outer diameter of the connection end portion 52 of the water passage tube 51 is expanded by the insertion tube portion 6 of the connection tool body 2. The diameter is larger than the inner diameter of the moving sleeve 41. Therefore, next, as shown in FIG. 11 (b), the moving sleeve 41 is moved and extrapolated to the connection end portion 52 of the water pipe 51 whose diameter has been increased. As a result, the connection end 52 of the water conduit 51 is tightened by the inner peripheral surface of the moving sleeve 41, and is sandwiched between the outer peripheral surface of the insertion tube portion 6 and the inner peripheral surface of the moving sleeve 41, 61 is connected.

  However, in the connection work using the connection tool 61 shown in FIG. 11, the diameter of the connection end 52 of the water flow pipe 51 must be increased using a diameter expansion tool in advance, which is very troublesome, If the connecting end 52 of the water pipe 51 that has been expanded using a diameter expanding tool is not extrapolated quickly to the insertion tube portion 6 of the connector body 2 before the diameter of the connecting end 52 is reduced to the original state. did not become.

Therefore, in order to eliminate such problems, a water pipe connector disclosed in Japanese Patent Application Laid-Open No. 2003-33679 has been proposed. FIG. 12 shows a connection tool 71 described in the above publication, and in FIG. 12 (a), the connection tool 71 is a metal connection provided with an insertion tube portion 6 inserted into the connection end 52 of the water pipe 51. The tool body 2, an extrapolated sleeve 72 made of synthetic resin extrapolated to the connection end 52 of the water pipe 51, and the outer sleeve 72 and the water pipe 51 are moved to the outer sleeve 72 in the axial direction. It is comprised with the movement sleeve 41 extrapolated so that the connection edge part 52 may be crushed. The outer sleeve 72 has a small diameter portion 73 and a large diameter portion 74 in the axial direction. Here, the inner diameter of the extrapolation sleeve 72 is formed slightly larger than the outer diameter of the connection end 52 of the water conduit 51, and the inner diameter of the moving sleeve 41 is larger than the outer diameter of the small diameter portion 73 of the extrapolation sleeve 72. The sleeve 72 is formed to be smaller than the outer diameter of the large diameter portion 74.

According to this connector 71, the water conduit 51 is provided between the inner peripheral surface of the movable sleeve 41 and the outer peripheral surface of the insertion tube portion 6 of the connector main body 2 as shown in FIG. The connection end 52 of 51 and the large-diameter portion 74 of the extrapolation sleeve 72 are clamped to connect to the connector main body 2. The synthetic resin material forming the connection end portion 52 and the extrapolation sleeve 72 of the water flow pipe 51 is crushed and pushed out as the moving sleeve 41 moves, but the synthetic material pushed out to the connector main body 2 is pushed out. Since the receiving space 75 for receiving the resin material is formed, the movement of the moving sleeve 41 is prevented from being inhibited by the crushed synthetic resin material.
JP 2003-336777 A

  However, the connecting tool 71 described in the above publication forms the connecting sleeve 52 and the connecting end 52 of the water pipe 51 when the moving sleeve 41 is extrapolated to the outer sleeve 72 in the operation of connecting the water pipe 51. Since it is necessary to push the synthetic resin material being crushed, a large pushing force is required. That is, since the inner diameter of the moving sleeve 41 is smaller than the outer diameter of the large-diameter portion 74 of the outer sleeve 72, the moving sleeve 41 pushes the synthetic resin material corresponding to the difference in inner and outer diameters from the outer sleeve 72. Since it is necessary to move forward while crushing, a great pushing force is required for the advancement while crushing. For this reason, the burden of work was heavy and the work took time. Furthermore, there is a risk that the tightening tool may come off and damage the connection tool or the like by applying an excessive force, which is also dangerous.

  Then, this invention makes it a subject to provide the connection tool of a water pipe which can reduce the force required at the time of connection in the thing which extrapolates and connects a moving sleeve, without expanding the diameter of the connection end part of a water pipe. .

The water pipe connector according to claim 1, for connecting a water pipe made of synthetic resin, a connector main body provided with an insertion tube portion inserted into a connection end of the water pipe, A synthetic resin extrapolation sleeve extrapolated to the connection end of the water conduit, and a movable sleeve extrapolated to the extrapolation sleeve so as to crush the extrapolation sleeve and the connection end of the water conduit Comprising. In addition, the extrapolation sleeve has a small-diameter portion whose outer diameter is smaller than the inner diameter of the moving sleeve and a larger-diameter portion larger than the inner diameter of the moving sleeve, and a slit is formed in the axial direction. Furthermore, the end portions of the extrapolation sleeve are all formed so as to reach the entire circumference in an annular shape. That is, in both end portions, the outer wall portions sandwiched between adjacent slits are connected to the entire periphery at the end portions, and are connected to each other. The moving sleeve is extrapolated by moving from the small-diameter portion of the extrapolated sleeve to the large-diameter portion, and the connecting end portion of the water pipe and the large-diameter portion of the extrapolated sleeve are connected to the inner peripheral surface of the movable sleeve. The water pipe is connected to the connector main body by being sandwiched between the outer peripheral surface of the insertion tube portion of the connector main body.

The connector main body and the moving sleeve are usually formed of a metal material. On the other hand, the water pipe and the extrapolation sleeve are made of a synthetic resin material, and the extrapolation sleeve is usually a softer one having slightly smaller hardness and rigidity than the water duct. However, the water pipe and the extrapolation sleeve may have the same hardness and rigidity.
The inner diameter of the water pipe is formed to be approximately the same as the outer diameter of the inner tube portion of the connector body, and smoothly and easily extrapolates to the inner tube portion of the connector body without using a diameter expanding tool. be able to. However, if the water pipe can be extrapolated to the insertion tube part of the connector body without using a diameter expanding tool, the inner diameter of the water pipe can be made slightly smaller than the outer diameter of the tube part of the connector body. Good. Moreover, the inner diameter of the outer sleeve is generally formed to be substantially the same as or slightly larger than the outer diameter of the water pipe.

  Since the moving sleeve is extrapolated from the small diameter side with respect to the extrapolated sleeve, it can be smoothly extrapolated to the extrapolated sleeve, and after extrapolation, the large diameter portion of the extrapolated sleeve and the connection end of the water pipe are connected. The water pipe is firmly connected to the connector main body so as to be squeezed together with the outer sleeve by being clamped by the inner tube portion of the connector main body.

  Since the outer sleeve has a slit formed in the axial direction, when a compressive force is evenly applied from the outside to the entire outer peripheral surface of the outer sleeve by extrapolating the movable sleeve, Since there is a gap corresponding to the slit width in the direction, no compressive stress is generated in the circumferential direction until the gap is completely closed by the reduced diameter. Therefore, the pushing force of the moving sleeve is reduced accordingly.

  In the water pipe connecting tool according to claim 2, the slit of the extrapolation sleeve has the inner peripheral surface of the extrapolation sleeve reaching the entire circumference so as to be in close contact with the outer peripheral surface of the connection end of the water pipe. In order to sandwich the outer sleeve, the outer sleeve is formed to have a width that is completely or slightly closed after the diameter of the outer sleeve is reduced with the extrapolation of the moving sleeve. However, ideally, the slit after completion of the diameter reduction is in a completely closed state in which the extrapolation sleeve is further crushed even after the gap is closed, and the water pipe and the extrapolation sleeve are firmly clamped and clamped. Is desirable.

In the water pipe connecting tool according to claim 3 , the outer sleeve is inserted between the inner peripheral surface of the outer sleeve and the outer peripheral surface of the inner tube portion of the connector main body. The insertion sleeve is integrally assembled to the connector main body in a state where the insertion space is formed, and the moving sleeve is integrally assembled to the outer insertion sleeve.

According to the first aspect of the present invention, since the axial slit is formed in the extrapolation sleeve, even if the moving sleeve is extrapolated to reduce the diameter, it is compressed in the circumferential direction until the slit gap is closed. There is no stress. That is, since only the compressive stress in the radial direction is generated, the pushing force of the moving sleeve can be reduced by the amount that the compressive stress is not generated in the circumferential direction, and the force required for connection can be reduced. As a result, the work can be performed easily and the work time can be shortened. Furthermore, by applying an excessive force, the connection tool or the like is not damaged at any moment, and the work can be performed safely.
Further, since the end portions of the extrapolation sleeve are all connected in an annular shape to the entire circumference, the extrapolation sleeve is generally resistant to twisting and the overall shape is stabilized. And since the end shape is stable, the extrapolation sleeve can be easily extrapolated to the connection end of the water pipe.

  In the invention of claim 2, since the slit of the extrapolation sleeve is formed to have a width that is completely closed after leaving the diameter of the extrapolation sleeve or leaving a slight gap, the extrapolation sleeve is passed through the inner peripheral surface. The outer peripheral surface of the water pipe is clamped over the entire circumference. Thereby, it is possible to reliably prevent the leakage of water from a portion where the adhesion between the extrapolation sleeve and the water pipe is insufficient at a portion in the circumferential direction.

In the invention of claim 3 , since the connector main body, the extrapolation sleeve, and the moving sleeve are integrally assembled, immediately between the inner peripheral surface of the extrapolation sleeve and the outer peripheral surface of the inner tube portion of the connector main body. Since the connecting end of the water pipe can be inserted into the insertion space, and then the water pipe can be easily connected to the connecting tool by simply moving the moving sleeve in the axial direction, workability is improved. Further, when the extrapolation sleeve and the moving sleeve are assembled separately, the extrapolation sleeve extrapolated in advance to the water conduit until the water conduit is extrapolated to the inner tubular portion of the connector main body and Since there is a possibility that the moving sleeve may come off, it is necessary to hold these members until the extrapolation. However, the connector of claim 3 holds the extrapolation sleeve and the moving sleeve during that time. Since it is not necessary, workability is improved.

Hereinafter, a water pipe connector according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10.
1 and 2, the connector 1 includes a metal connector main body 2, an extrapolated sleeve 21 made of synthetic resin, and a metal moving sleeve 41. Each of these structural members may be assembled together in advance or may be configured as a separate body. The connection tool 1 is for connecting the water conduit 51 to a header or the like.

  First, as shown in FIG. 3, the connector main body 2 has a through hole 3 through which water flows, and a hexagonal nut-like flange 4 is provided at a substantially central portion of the outer wall. On one end side of the flange portion 4, a screwed portion 5 is formed which is screwed into a screw hole of the header 53 shown in FIG. 6 and the like, and a male screw 5 a is threaded on the outer peripheral surface of the screwed portion 5. On the other end side of the collar portion 4, a substantially cylindrical insertion tube portion 6 is integrally protruded toward the axial direction. The outer peripheral surface of the inner tube portion 6 is formed to have an outer diameter substantially the same as the inner diameter of the inner peripheral surface of the water pipe 51, and the water tube 51 can be inserted smoothly and easily without using a diameter expanding tool or the like. 6 can be extrapolated. On the outer peripheral surface on the distal end side of the inner tube portion 6, annular ribs 7 that protrude into the inner peripheral surface of the water flow pipe 51 and prevent removal are protruded at two axial positions.

  An annular projecting portion 10 having a substantially L-shaped cross section is formed at a position spaced outward from the base end portion of the inner tube portion 6 and axially spaced from the flange portion 4, and abuts perpendicular to the tube axis The front end surface of the extrapolation sleeve 21 abuts against the surface 10a to prevent the extrapolation sleeve 21 from entering further. On the side of the connection opening 11 of the annular projecting portion 10, an anti-extraction protrusion 10b that protrudes slightly inwardly is integrally provided, and between the abutment surface 10a and the anti-extraction protrusion 10b, described later. The flange portion 25 of the outer sleeve 21 is fitted, and the outer sleeve 21 is prevented from being detached by the removal preventing projection 10b. An annular band 8 is provided between the flange 4 and the annular protrusion 10 in the axial direction. The clearance between the inner peripheral surface of the annular band portion 8 and the outer peripheral surface of the inner insertion tube portion 6 is large enough to allow the water conduit 51 to be inserted. The annular band portion 8 is provided with four circular confirmation windows 9 at equal intervals in the circumferential direction for confirming the tip position of the water pipe 51 inserted therein. The side surface of the flange portion 4 on the side of the connection opening 11 is a contact surface 4a with which the tip surface of the water conduit 51 abuts, and a window for checking whether the tip of the water conduit 51 reaches the contact surface 4a of the flange portion 4 It can be visually recognized from 9.

  Next, the extrapolation sleeve 21 to be extrapolated to the water pipe 51 is made of a synthetic resin material such as PPS resin, and is generally slightly more flexible and less rigid than the water pipe 51 made of synthetic resin. . The water flow pipe 51 is used to increase strength, prevent deformation and damage, and has a predetermined hardness and rigidity so that water can flow stably, whereas the extrapolation sleeve 21 has a certain degree of flexibility. This is because it is easy to be crushed by imparting the property to enhance the closeness with the water pipe 51. However, the present invention is not limited to this, and the extrapolation sleeve 21 does not prevent the extrapolation sleeve 21 from having the same or higher hardness and rigidity as the water pipe 51. As shown in FIG. 4, the outer insertion sleeve 21 is formed in a substantially cylindrical shape as a whole. The outer wall of the outer sleeve 21 is formed with a small-diameter portion 22 having an outer diameter substantially the same as or slightly smaller than the inner diameter of the moving sleeve 41 in the substantially half of the axial direction, and slightly smaller than the inner diameter of the moving sleeve 41 in the other half. A large diameter portion 23 having a large outer diameter is formed. A boundary portion between the small diameter portion 22 and the large diameter portion 23 is a tapered surface 24 that gradually expands from the small diameter portion 22 toward the large diameter portion 23. On the outer wall of the end portion on the large diameter portion 23 side of the outer insertion sleeve 21, an annular flange portion 25 is formed integrally with the entire circumference so as to protrude slightly outward. A plurality of concave grooves 25a are formed in the flange portion 25 at intervals in the circumferential direction.

  The inner circumferential surface of the outer sleeve 21 is formed to have an inner diameter that is substantially the same as or slightly larger than the outer diameter of the outer circumferential surface of the water pipe 51, so that the outer sleeve 21 can be inserted into the water pipe 51 smoothly and easily. ing. The inner peripheral surface of the outer sleeve 21 is formed as a smooth surface, and the small diameter portion 22 side is a tapered surface 27 that gradually decreases in diameter from the end opening 26 toward the inner side. The sleeve 21 can be smoothly extrapolated from the small diameter portion 22 side to the connection end portion 52 of the water conduit 51.

  Furthermore, a plurality of slits 28, which are a feature of the present invention, are provided on the peripheral wall of the outer sleeve 21 along the axial direction. In the present embodiment, eight slits 28 are provided at equal intervals in the circumferential direction, but the number thereof can be arbitrarily set. One end of the slit 28 is located in the middle of the small diameter portion 22, and the other end reaches the end opening 29 on the large diameter portion 23 side. However, at the end portion on the large diameter portion 23 side, the outer peripheral surface side of the slit 28 is connected by the peripheral edge 25 b of the flange portion 25. That is, the outer wall portion sandwiched between the adjacent slits 28 is connected to each other by the peripheral edge 25b of the flange portion 25 at the end portion on the large diameter portion 23 side, and is held in an annular shape. Accordingly, the outer sleeve 21 is connected in an annular shape at both ends along the entire circumference. The slit 28 is formed to have a constant width, and the outer sleeve 21 is reduced in diameter with the extrapolation of the moving sleeve 41 as will be described later, and after the diameter reduction, the inner peripheral surface reaches the entire circumference and the water pipe. 51 is formed in a size that is in close contact with the outer peripheral surface of the connection end portion 52 and sandwiches the connection end portion 52. Here, after the diameter reduction, the slit 28 substantially contacts the outer peripheral surface of the connection end portion 52 of the water pipe 51 so that the inner peripheral surface of the extrapolation sleeve 21 reaches the entire periphery, and sandwiches the connection end portion 52. Anything is acceptable. Therefore, basically, when the diameter reduction is completed, the gap s of the slit 28 is closed by the peripheral edge thereof. However, if the close contact and the clamping can be substantially secured, a slight gap s is formed in the slit 28. May remain.

  Further, on the outer peripheral surface of the small-diameter portion 22 of the outer sleeve 21, small protrusions 30 projecting outward are provided at four positions in the circumferential direction on the end opening 26 side, and are spaced apart by 180 degrees. The outer dimension between the opposed small protrusions 30 is formed slightly larger than the inner diameter of the inner peripheral surface of the moving sleeve 41. The small ridge 30 is elastically retracted inward when the movable sleeve 41 is forcibly inserted over the small ridge 30 and the movable sleeve 41 moves on the outer peripheral surface of the small diameter portion 22. When the moving sleeve 41 completes the movement at the small diameter portion 22, the moving sleeve 41 protrudes outward from the rear end of the moving sleeve 41 and engages with the rear end. This prevents it from being pulled out naturally by dropping it. Similarly, on the outer peripheral surface of the large-diameter portion 23 of the outer sleeve 21, a small protrusion 31 similar to the small protrusion 30 of the small-diameter portion 22 that protrudes outward on the end opening 26 side is provided in the circumferential direction. It is provided at equal intervals in four places. The small ridge 31 is moved by the movable sleeve 41 over the small ridge 31 forcibly and moved while crushing the synthetic resin material of the large-diameter portion 23 of the outer sleeve 21 to complete the movement. The movable sleeve 41 protrudes outward from the rear end of the movable sleeve 41 and engages with the rear end, so that the movable sleeve 41 is held at a fixed position on the outer insertion sleeve 21.

  As shown in FIG. 5, the moving sleeve 41 is made of a metal material and is formed in a substantially annular plate shape, the inner peripheral surface is formed as a smooth surface, and the outer sleeve 21 is externally attached from the small diameter portion 22 side. An inner peripheral surface on the end portion side to be inserted is formed with a tapered surface 43 that gradually decreases in diameter from the end opening 42 toward the inner side, and thereby, smoothly and easily from the small diameter portion 22 side of the outer insertion sleeve 21. It can be extrapolated.

  The water conduit 51 connected to the connector 11 is made of a synthetic resin material such as polyethylene and polybutene, and has flexibility, but also has a predetermined hardness and rigidity, and the connection opening 11 of the connector body 2. By pushing in from the side, the connection end 52 can be inserted into the insertion space V of the connection tool 1 and the tip can be inserted until it comes into contact with the abutting surface 4 a of the flange 4.

Next, a method for connecting the water conduit 51 to the connector 1 configured as described above will be described. First, the case of a connection tool in which each component is provided as a separate body will be described with reference to FIGS. 6 and 7.
In order to connect the water conduit 51 to the connection tool 1, as shown in FIG. 6, the connection tool 1 is attached by screwing the screw part 5 on one end side of the connection tool 1 into the screw hole of the header 53 in advance. First, the moving sleeve 41 is extrapolated from the side on which the tapered surface 43 is formed to the small diameter portion 22 of the extrapolating sleeve 21. At this time, the moving sleeve 41 is formed to have an inner diameter that is substantially the same as or slightly larger than the outer diameter of the small-diameter portion 22 of the extrapolated sleeve 21, and the tapered surface 43 is formed on the inner peripheral surface of the end portion. The extrapolation sleeve 21 can be extrapolated smoothly and easily. When the moving sleeve 41 is extrapolated until the tapered surface 43 reaches the tapered surface 24 of the outer sleeve 21, the small protrusion 30 of the small diameter portion 22 of the outer sleeve 21 is locked to the rear end of the movable sleeve 41. Therefore, it is possible to prevent the movable sleeve 41 from being easily detached from the extrapolated sleeve 21 due to a natural fall or the like. Next, the water conduit 51 is inserted into the outer sleeve 21 from the small diameter portion 22 side, and the outer sleeve 21 and the moving sleeve 41 are separated from the connection end portion 52 by a predetermined distance. At this time, the inner peripheral surface of the outer sleeve 21 is formed to have an inner diameter that is substantially the same as or slightly larger than the outer diameter of the water conduit 51, and the inner peripheral surface of the end portion on the small diameter portion 22 side of the outer sleeve 21. Since the tapered surface 27 is formed, there is no particular problem in inserting the water conduit 51. FIG. 6 shows a state where the extrapolation sleeve 21 and the movable sleeve 41 are extrapolated into the water conduit 51.

  Subsequently, the connection end portion 52 of the water conduit 51 is extrapolated to the insertion tube portion 6 of the connector main body 2 and is pushed in until the distal end surface comes into contact with the abutting surface 4 a of the flange portion 4 of the connector main body 2. Also at this time, since the inner diameter of the water flow pipe 51 is formed to be approximately the same as the outer diameter of the inner tube portion 6 of the connector main body 2, it can be smoothly pushed in without using a diameter expanding tool or the like. Can be inserted. Then, the end of the extrapolation sleeve 21 on the large diameter portion 23 side is brought into contact with the abutting surface 10a of the annular protrusion 10 of the connector main body 2, and the flange portion 25 of the large diameter portion 23 is annularly connected to the connector main body 2. It fits between the abutting surface 10a of the protrusion part 10 and the removal prevention protrusion 10b. With this insertion, the outer sleeve 21 is prevented from being pulled out of the connector main body 2 by locking the collar portion 25 with the hook-shaped pull-out preventing projection 10b. In addition, it is confirmed from the confirmation window 9 whether or not the distal end surface of the water conduit 51 is inserted until it comes into contact with the abutting surface 4 a of the flange portion 4 of the connector main body 2.

  After the water pipe 51 is extrapolated to the inner tube portion 6 of the connector body 2 and the outer sleeve 21 is attached to the connector body 2 together with the movable sleeve 41, the movable sleeve 41 is attached to the connector body using a tool such as a slider. 2 toward the annular projecting portion 10 side and moved along the axial direction. At this time, a tapered surface 24 that gradually increases in diameter from the small diameter portion 22 toward the large diameter portion 23 is formed at the boundary between the small diameter portion 22 and the large diameter portion 23 of the outer wall of the extrapolation sleeve 21. Since the tapered surface 43 is formed on the inner peripheral surface on the tip end side of the moving sleeve 41, the moving sleeve 41 can smoothly and quickly reach the small diameter portion without being caught between the small diameter portion 22 and the large diameter portion 23. It is possible to get over the boundary between the large diameter portion 22 and the large diameter portion 23 and to extrapolate the large diameter portion 23 of the extrapolation sleeve 21 while gradually crushing the large diameter portion 23. Then, by continuing the pushing, the moving sleeve 41 moves on the large diameter portion 23 side, and the pushing is stopped when the distal end surface comes into contact with the annular projecting portion 10 of the connector main body 2. This state is shown in FIG.

  Here, since the inner diameter of the moving sleeve 41 is smaller than the outer diameter of the large-diameter portion 23 of the extrapolating sleeve 21, when the moving sleeve 41 is extrapolated to the large-diameter portion 23, the moving sleeve 41 is larger than the extrapolating sleeve 21. The synthetic resin material on the outer surface portion of the diameter portion 23 is crushed and pushed forward to advance, thereby receiving indentation resistance. However, since the slit 28 is formed in the peripheral wall of the extrapolation sleeve 21 as will be described later, the large-diameter portion of the extrapolation sleeve 21 to be crushed as compared with the connection tool 71 described in the conventional publication. The amount of the synthetic resin material 23 is reduced, and the resistance received by crushing the large diameter portion 23 of the extrapolation sleeve 21 is reduced. As a result, it is sufficient to move the moving sleeve 41 with a small pushing force as compared with the conventional connector 71. The synthetic resin material of the large diameter portion 23 of the crushed extrapolation sleeve 21 is accommodated in a space between the inner peripheral surface of the movable sleeve 41 and the taper 43 surface. Intrusion into the contact surface between the peripheral surface and the water pipe 51 and the like to prevent the adhesion between them is avoided.

  In this way, when the distal end surface of the moving sleeve 41 moves until it abuts against the annular protrusion 10 of the connector main body 2, the synthetic resin water pipe 51 and the large-diameter portion 23 of the extrapolation sleeve 21 are made of metal. The insertion tube portion 6 of the connector main body 2 and the movable sleeve 41 are strongly clamped, and the water pipe 51 is firmly connected to the connector 1 by the compression force, and the connector is connected by the large sliding resistance due to the compression force. It is prevented from coming off from 1.

  Next, the connection tool main body 2, the extrapolation sleeve 21, and the moving sleeve 41 have been described with respect to the connection of the water pipe 51 to the connection tool 1. When connecting to the connector 1 in which the sleeve 21 and the moving sleeve 41 are integrally assembled, as shown in FIG. 8, the flange portion 25 of the large-diameter portion 23 of the extrapolated sleeve 21 is an annular protrusion of the connector body 2. The movable sleeve 41 is fitted into the portion 10, and the rear end of the moving sleeve 41 is engaged with the small protrusion 30 provided at the end of the outer peripheral surface of the small diameter portion 22 of the outer sleeve 21. Thereby, the extrapolation sleeve 21 and the moving sleeve 41 are stably held by the connector main body 2, and are not easily detached from the connector main body 2 due to dropping or the like.

  In the connection tool 1 in which these members are integrally assembled, the movable sleeve 41 is in a state of being externally fitted to the small-diameter portion 22 of the external insertion sleeve 21, and the internal insertion tubular portion 6 and the external insertion sleeve of the connection body 2. An insertion space V into which the connection end portion 52 of the water conduit 51 is inserted is formed between the first and second pipes 21 and 21. Therefore, in order to connect the water conduit 51 to the integrally assembled connecting tool 1, the connecting tool 1 is attached by screwing the threaded portion 5 on one end side of the connecting tool 1 into the screw hole of the header 53 in advance. In this state, the connecting end portion 52 of the water conduit 51 can be externally inserted into the insertion tube portion 6 simply by being inserted into the insertion space V of the connector 1. Thereafter, as in the case of the separate connector 1, the moving sleeve 41 is moved while being pushed out from the small diameter portion 22 of the extrapolation sleeve 21 toward the large diameter portion 23, and connected to the moving sleeve 41. The water conduit 51 can be connected to the connector 1 by sandwiching the connecting end portion 52 of the water conduit 51 and the large diameter portion 23 of the outer sleeve 21 with the inner tube portion 6 of the tool body 2. Therefore, when connecting the water conduit 51 to the integrally assembled connector 1, in the above-described connector 1 provided as a separate body, the water conduit 51 is externally attached to the insertion tube portion 6 of the connector body 2. Prior to the insertion, it is possible to save the trouble of extrapolating the movable sleeve 41 to the extrapolated sleeve 21 and extrapolating the extrapolated sleeve 21 to the water pipe 51.

  Next, the moving sleeve 41 is pushed in and is sandwiched between the inner insertion tube portion 6 of the connector body 2 and the moving sleeve 41, whereby the connection end portion 52 of the water flow pipe 51 and the large diameter portion 23 of the outer insertion sleeve 21. When the synthetic resin material is crushed and compressed, the state shown in FIG. 9 is considered in the process. 9 schematically shows the cross-sectional shapes of the water flow pipe 51 and the extrapolation sleeve 21 cut in the direction perpendicular to the tube axis in the large diameter portion 23 of the extrapolation sleeve 21, and FIG. FIGS. 9 (e) and 9 (f) are enlarged views of a portion surrounded by a one-dot chain line circle in FIGS. 9 (a), 9 (b), and 9 (c), respectively.

  First, FIGS. 9A and 9D are views after the extrapolation sleeve 21 and the movable sleeve 41 are extrapolated to the water flow pipe 51, and the movable sleeve 41 is changed from the small diameter portion 22 of the extrapolation sleeve 21 to the large diameter portion. The state immediately before moving to 23 is shown. 9A and 9D, a slight clearance c is generated in the radial direction between the outer peripheral surface of the water conduit 51 and the inner peripheral surface of the outer sleeve 21, and the slit 28 of the outer sleeve 21. Is a gap s1. Here, in FIG. 9 (d), t1 indicates the thickness of the connecting end portion 52 of the water pipe 51 before compression by the moving sleeve 41, and T1 indicates the thickness of the large-diameter portion 23 of the extrapolation sleeve 21 before compression. It shows.

  In this state, when the moving sleeve 41 is moved to the large diameter portion 23 side of the extrapolated sleeve 21 through the tapered surface 24, the outer sleeve 41 is moved in the middle as shown in FIGS. 9 (b) and 9 (e). The insertion sleeve 21 is pressed inward by the inner peripheral surface of the moving sleeve 41 while the outer surface portion is being crushed to reduce the diameter. And the inner peripheral surface of the extrapolation sleeve 21 contacts the outer peripheral surface of the water flow pipe 51, and the clearance c disappears. In the state immediately after the inner peripheral surface of the outer sleeve 21 comes into contact with the outer peripheral surface of the water pipe 51, the gap of the slit 28 of the outer sleeve 21 becomes narrower as the diameter decreases, but becomes the gap s2. It is not completely occluded. In this state, the connection end portion 52 of the water flow pipe 51 and the large diameter portion 23 of the extrapolation sleeve 21 are not yet compressed, so the thickness of the connection end portion 52 of the water flow pipe 51 and the large diameter portion 23 of the extrapolation sleeve 21. Does not change, and is the size of t1 and T1, respectively. Therefore, at this stage, even if the large-diameter portion 23 of the extrapolation sleeve 21 is pressed by the moving sleeve 41, no compressive stress is generated in the circumferential direction, and no compressive stress is generated in the large-diameter portion 23 of the water conduit 51. .

  Next, when the moving sleeve 41 further moves and the tip end abuts on the annular projecting portion 10 of the connector main body 2 to complete the movement and is positioned on the large diameter portion 23 of the extrapolating sleeve 21, the moving sleeve 41 By further pressing, the large-diameter portion 23 of the outer insertion sleeve 21 and the connection end portion 52 of the water conduit 51 are pinched and compressed by the movable sleeve 41 and the inner insertion tube portion 6 of the connector main body 2. As a result, as shown in FIGS. 9C and 9F, the thickness of the connection end portion 52 of the water conduit 51 is reduced to t2, and the thickness of the large diameter portion 23 of the extrapolation sleeve 21 is T2. become. That is, (t1−t2) + (T1−T2) is equal to (radius to the outer peripheral surface of the outer sleeve 21 before diameter reduction) − (radius to the inner peripheral surface of the moving sleeve 41). Accordingly, both the large-diameter portion 23 of the extrapolation sleeve 21 and the connection end portion 52 of the water conduit 51 are further reduced in diameter from the state shown in FIGS. 9B and 9E. At the same time, the slit 28 of the extrapolation sleeve 21 is completely closed by the opposite peripheral edges of the slit 28 in the state shown in FIGS. 9C and 9F, and the gap s disappears. As a result, a compressive stress is generated in the radial direction in the large-diameter portion 23 of the extrapolation sleeve 21, and a compressive stress in the circumferential direction indicated by an arrow is generated on the opposing surface where both opposing peripheral edges of the slit 28 abut. Similarly, a compressive stress is also generated in the connecting end portion 52 of the water flow pipe 51 in the radial direction and the circumferential direction. These compressive stresses are generated by the force pushing the moving sleeve 41, and the total force of these compressive stresses is equal to the pushing force of the moving sleeve 41.

  Therefore, when compared with the case of the conventional connector 71, the conventional connector 71 does not have the slit 28 formed in the outer sleeve 21. That is, in the extrapolation sleeve 21 of the conventional connector 71, the gap s1 in FIGS. 9 (a) and 9 (d) and the gap s2 in FIGS. 9 (b) and 9 (e) are zero. Therefore, the initial thickness t1 of the connecting portion of the water flow pipe 51 and the initial thickness T1 of the large diameter portion 23 of the outer sleeve 21 are compressed from the beginning of the diameter reduction transitioning from FIG. 9 (a) to (b). Become smaller. That is, the conventional connecting tool 71 generates a circumferential compressive stress on the outer sleeve 21 from the beginning of the diameter reduction. Therefore, the overall compressive force generates a circumferential compressive stress in the extrapolation sleeve 21 of the conventional connector 71 in the process from FIG. 9 (a) to FIG. 9 (b) as compared with the connector 1 of the present invention. Therefore, it is considered that a large force is required to push in the moving sleeve 41 of the conventional connector 71 by a corresponding amount. In other words, the connection tool 1 of the present invention is less resistant to the movement of the moving sleeve 41 than the conventional connection tool 71, and the force for pushing the moving sleeve 41 is reduced. it is conceivable that.

  In the extrapolation sleeve 21 of the present invention, the gap s2 may be closed in the large diameter portion 23 in the stage of FIGS. 9B and 9E. In this case, compressive stress is generated in the circumferential direction due to the reduced diameter from the stage where the gap s2 of the large diameter portion 23 of the extrapolated sleeve 21 is closed. However, in any case, until the gap s2 is closed, unlike the conventional connector 71, even if the diameter is reduced, no compressive stress is generated in the large diameter portion 23 of the extrapolation sleeve 21. Therefore, the resistance received when the moving sleeve 41 moves is reduced correspondingly, and the force required to push the moving sleeve 41 is still reduced.

Next, the operation of the connection tool 1 will be described.
As described above, the extrapolation sleeve 21 of the conventional connector 71 is reduced in diameter by receiving a compressive force from the outside when the movable sleeve 41 is pushed in and moved, and is compressed in the circumferential direction and the radial direction. Develop compressive stress in both directions. For this reason, the extrapolation sleeve 21 is crushed by these compressive forces, and the amount of the synthetic resin material pushed forward by the movement of the moving sleeve 41 is large. Therefore, a large pushing force is required to connect the water pipe 51. However, the extrapolation sleeve 21 of the present embodiment is formed with slits 28 in the axial direction and there are gaps s in the circumferential direction. Therefore, even if the diameter is reduced, until the gaps s of the slits 28 are closed. As described in 9, no compressive stress is generated in the circumferential direction. Therefore, the pushing force for moving the moving sleeve 41 is reduced by the amount that no compressive stress is generated in the circumferential direction. Thereby, since the force required for the connection of the water pipe 51 can be reduced, the connection work can be easily performed.

  In addition, the slit 28 of the extrapolation sleeve 21 is formed to have a width close to the outer peripheral surface of the connection end portion 52 of the water pipe 51 after reaching the entire circumference after the diameter reduction of the extrapolation sleeve 21. At that time, the outer sleeve 21 is crushed and the inner peripheral surface reaches the entire circumference so as to be in close contact with the outer peripheral surface of the connection end 52 of the water pipe 51, and the outer peripheral surface of the water pipe 51 reaches the entire circumference. Press. As a result, even after the diameter reduction is completed, the gap s of the slit 28 remains in a part of the circumferential direction of the extrapolation sleeve 21, so that the portion becomes insufficiently held, and the close contact with the water conduit 51 is inadequate. It is possible to surely prevent a problem that becomes sufficient and causes water leakage from the portion. Here, after completion of the diameter reduction, the slit 28 can substantially ensure close contact with the water pipe 51, and if the water pipe 51 can be securely clamped, the presence of a slight gap s is allowed. However, ideally, the slit 28 after the completion of the diameter reduction is completely squeezed by the extrapolation sleeve 21 even after the gap s is closed, so that the water conduit 51 and the extrapolation sleeve 21 are firmly clamped. It is desirable to be in a closed state.

  Further, in the connection tool 1, the end portions of the extrapolation sleeve 21 are connected to each other in an annular shape all around the ends, and the slits 28 are connected to each other at the end portions. For this reason, the extrapolation sleeve 21 is resistant to twisting, and the overall shape is stabilized. And since the end shape is stable, the extrapolation sleeve 21 can be easily extrapolated to the connection end 52 of the water pipe 51. In addition, the slit 28 is formed up to the end opening 29 of the large-diameter portion 23 of the extrapolated sleeve 21, and the outer wall portion between the adjacent slits 28 in the large-diameter portion 23 is all around the peripheral edge 25 b of the flange portion 25. Therefore, in addition to the stabilization of the shape of the entire extrapolation sleeve 21, the function of the slit 28 can be sufficiently exhibited.

Further, since the moving sleeve 41 is extrapolated from the small diameter portion 22 side with respect to the extrapolating sleeve 21, it can be smoothly extrapolated to the extrapolating sleeve 21.
Since the outer sleeve 21 is provided with the small-diameter portion 22, when an external force to be bent is applied to the water pipe 51 that has been connected to the connector 1, the small-diameter portion 22. Compared to the case where the water pipe is not provided, the water pipe 51 can be prevented from being bent sharply, and the water pipe 51 can be prevented from being bent or cracked.

  In addition, when the connector main body 2, the extrapolation sleeve 21, and the moving sleeve 41 are integrally assembled, the inner peripheral surface of the extrapolation sleeve 21 and the inner tube portion 6 of the connector main body 2 are immediately and as they are. The connecting end 52 of the water pipe 51 can be inserted into the insertion space V between the outer peripheral surface, and after that, the water pipe 51 can be easily connected by simply moving the moving sleeve 41 in the axial direction. 1 can be connected. Therefore, the trouble of extrapolating the outer sleeve 21 and the moving sleeve 41 to the water pipe 51 is saved, and the workability is improved. Moreover, when these members are assembled | attached separately, after inserting the outer sleeve 21 and the movement sleeve 41 in the connection end part 52 of the water flow pipe 51 previously, the insertion cylinder part of the connector main body 2 is attached. 6, the water pipe 51 is extrapolated and connected. However, since the inner diameter of the outer sleeve 21 is substantially the same as or slightly larger than the outer diameter of the water pipe 51, the outer pipe 21 of the connector body 2 is externally connected. There is a risk that the extrapolation sleeve 21 and the moving sleeve 41 may come off in some time before being inserted. For this reason, it is necessary to hold the outer sleeve 21 and the moving sleeve 41 together with the water pipe 51 until the water pipe 51 is extrapolated to the inner tube portion 6 of the connector body 2. However, in the case of the connector 1 in which these members are integrally assembled, the outer sleeve 21 and the moving sleeve 41 are not moved until the water pipe 51 is extrapolated to the inner tube portion 6 of the connector body 2. There is no need to hold it, and the water conduit 51 can be externally inserted into the insertion tube portion 6 of the connector body 2 simply by being inserted into the connector 1.

  In addition, since the internal diameter of the water flow pipe 51 is formed in the substantially same magnitude | size as the outer diameter of the internal insertion cylinder part 6 of the connector main body 2, the connection edge part of the water flow pipe 51 is used, without using a diameter expansion tool etc. 52 can be smoothly and easily extrapolated to the insertion tube portion 6 of the connector main body 2.

  By the way, although the slit 28 of the extrapolation sleeve 21 of the said embodiment reaches the full length and is formed in the same width, it is not restricted to this, The width | variety of the slit 28 may differ in the axial direction. For example, when the extrapolation sleeve 21 is compressed by the movement of the moving sleeve 41 and the diameter is reduced, the slit 28 has the smallest gap s at the substantially central portion in the axial direction, and this portion is locally strongly compressed and closed. When the outer sleeve 21 is compressed and reduced in diameter, the width of the slit 28 is maximized at the substantially central portion in the axial direction and becomes smaller toward both end portions in the axial direction. It is also conceivable that the gap s of the slit 28 is closed almost uniformly throughout the entire area.

  Moreover, although the both ends of the extrapolation sleeve 21 of the above-described embodiment reach the entire circumference and are connected in an annular shape, either one of the end portions or both ends may not be connected in an annular shape.

  Furthermore, the slits 28 of the extrapolation sleeve 21 of the above embodiment are provided on both sides of the large diameter portion 23 and the small diameter portion 22, and the large diameter portion 23 extends to the end opening 29. However, the present invention is not limited to this, and may be provided only in the large-diameter portion 23, or may not extend to the end opening 29 of the large-diameter portion 23. .

  In the above embodiment, the synthetic resin of the extrapolated sleeve 21 that has been crushed and pushed out as the moving sleeve 41 moves is placed in the space between the inner peripheral surface of the moving sleeve 41 and the tapered surface 43. By accommodating, it is trying to avoid entering the contact surface between the extrapolation sleeve 21 and the water conduit 51 and losing the adhesion between them, but only for accommodating the extruded extrapolation sleeve 21 The receiving space may be provided in another location.

  In addition, although the moving sleeve 41 of the said embodiment is formed with the metal material, it is not limited to this, You may form with the hard resin material etc. which filled the reinforcement material etc.

  Further, as shown in FIG. 10, the connector main body 2 of the above embodiment further has an annular groove 12 formed at a position spaced from the annular rib 7 of the insertion tube portion 6. The ring 13 may be fitted. In this case, the water stoppage can be further enhanced in response to variations in the outer diameter of the water conduit 51.

  Further, in the present invention, the water pipe 51 has an inner diameter that is substantially the same as the outer diameter of the inner tube portion 6 of the connector body 2, but the inner diameter is the outer diameter of the inner tube portion 6 of the connector body 2. It is smaller than the diameter and does not preclude application to the water pipe 51 that is extrapolated to the inner cylindrical portion 6 by using a diameter expanding tool.

It is a top view which shows the connection tool of the water pipe of embodiment of this invention. It is sectional drawing by the AA cutting line of FIG. 1 shows the connector main body of FIG. 1, (a) is a partially broken front view, and (b) is a right side view. FIG. 1 shows the extrapolation sleeve of FIG. 1, (a) is a left side view, (b) is a front view, (c) is a right side view, and (d) is a sectional view taken along the line BB in (b). . The moving sleeve of FIG. 1 is shown, (a) is a front view, (b) is sectional drawing by CC cutting | disconnection line of (a). It is sectional drawing which shows the state just before connecting a water pipe to the connecting tool of FIG. It is sectional drawing which shows the state immediately after connecting a water flow pipe to the connecting tool of FIG. It is sectional drawing which shows the state just before connecting a water pipe to the connection tool of FIG. 1 with which each structural member was assembled | attached integrally. It is explanatory drawing which shows typically a state when the extrapolation sleeve and water pipe of FIG. 1 are compressed and clamped. It is sectional drawing which shows the modification of the connecting tool of FIG. It is sectional drawing which shows the connection tool of the conventional water pipe, (a) shows the state just before connecting a water pipe, (b) shows the state immediately after connecting. It is sectional drawing which shows the connection tool of another conventional water pipe, (a) shows the state just before connecting a water pipe, (b) shows the state immediately after connecting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection tool 2 Connection tool main body 6 Inner insertion cylinder part 21 External insertion sleeve 22 Small diameter part 23 Large diameter part 28 Slit 41 Moving sleeve 51 Water pipe 52 Connection end part V Insertion space

Claims (3)

A water pipe connector for connecting a synthetic resin water pipe,
A connector main body having an insertion tube portion inserted into a connection end portion of the water pipe;
A synthetic resin extrapolation sleeve extrapolated to the connection end of the water conduit;
The extrapolated sleeve comprises a moving sleeve that is extrapolated so as to crush the extrapolated sleeve and the connecting end of the water pipe,
The extrapolation sleeve has a small diameter portion whose outer diameter is smaller than the inner diameter of the moving sleeve and a larger diameter portion larger than the inner diameter of the moving sleeve, and a slit is formed in the axial direction,
Furthermore, the end portions of the extrapolation sleeve are all formed in an annular shape extending to the entire circumference,
The movable sleeve is extrapolated by moving from the small diameter portion of the extrapolated sleeve to the large diameter portion, and the connection end portion of the water conduit and the large diameter portion of the extrapolated sleeve are connected to the inner peripheral surface of the movable sleeve and the connection The water pipe connecting tool, wherein the water pipe is connected to the connector main body by being sandwiched between the outer peripheral surface of the insertion tube portion of the tool main body.   The slit of the extrapolation sleeve is arranged so that the inner circumference surface of the extrapolation sleeve reaches the entire circumference and is in close contact with the outer circumference surface of the connection end portion of the water pipe so as to sandwich the connection end portion. 2. The water pipe connecting device according to claim 1, wherein the water pipe connecting tool is formed to have a width that is completely or slightly closed after the diameter of the moving sleeve is reduced with extrapolation. 3. The extrapolation sleeve is in a state in which an insertion space into which the connection end of the water conduit is inserted is formed between the inner circumferential surface of the extrapolation sleeve and the outer circumferential surface of the insertion tube portion of the connector main body. It is assembled integrally with the connector body,
The water pipe connecting tool according to claim 1 or 2 , wherein the movable sleeve is integrally assembled with the outer sleeve .

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