Pipe joint

Abstract

To provide a pipe joint that suppresses cost and has excellent workability.SOLUTION: A pipe joint 1 includes: a cylindrical joint body 100 for connecting a pipe P; a cylindrical in-core 105 accommodated in the joint body 100; and a seal material 200. The seal material 200 is affixed to an end surface of the in-core 105 and a socket end surface 102e of the joint body 100. At the time of construction, the in-core 105 is inserted into the inside of an end of the pipe P.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pipe joint. [Background technology]

[0002] One known type of pipe joint is an external watertight joint, which has a watertight gasket placed on the outside of the pipe and seals off water by contact between the outside of the pipe and the gasket. External watertight joints have lower pressure loss than internal watertight joints. Therefore, they offer the advantage of easily maintaining the discharge flow rate even in piping that frequently uses elbow joints and T-branch joints, and are therefore widely used as joints in piping.

[0003] Some pipe fittings, such as external watertight fittings, may have a component called an incore in addition to the cylindrical fitting body that connects the pipes. The incore is inserted inside the end of the pipe, and when the pipe is inserted into the fitting body, it serves to suppress deformation of the pipe and maintain watertightness between the packing and the pipe. Generally, the incore is housed in the fitting body during transportation and before installation.

[0004] However, during transportation or installation, the inner core sometimes falls out from inside the joint body and gets lost. In response to this, for example, Patent Document 1 discloses a joint having a seal member that can prevent a core ring (in-core) housed in a pipe connection port from falling out of the pipe connection port.

[0005] Furthermore, if the socket of the fitting body is left open, there is a risk of dust and dirt getting into the inside of the pipe fitting. The present invention discloses a joint having a dustproof cap for the joint, which exhibits excellent performance, closes gaps with the joint, improves adhesion, and can be easily attached and detached with a single touch. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-170975 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-117555 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the sealing material described in Patent Document 1 has a notch (D-cut shape) in one part, which creates a gap between the D-cut end face and the joint, causing the problem of minute particles entering the joint. There is also the problem that the handle portion tears off from the seal body when peeling off the sealing material. In addition, there is also the problem that the handle portion is small and difficult to grip by hand.

[0008] Furthermore, the dustproof cap for a joint described in Patent Document 2 has the problem of high costs for materials and molding because it is made by vacuum forming a thin circular resin plate. Also, there is a problem that the adhesion between the dustproof cap and the joint is poor, so if the joint is dropped during installation, the cap pops out, and the dustproof function is lost.

[0009] The present invention has been made in consideration of these problems, and has as its object to provide a pipe joint that is cost-effective and easy to install. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention proposes the following means.

[0011] (1) The pipe fitting of the present invention comprises a cylindrical fitting body for connecting pipes, a cylindrical inner core housed in the fitting body, and a sealing material, and the sealing material is attached to the end face of the inner core and the receiving end face of the fitting body, and during installation, the inner core is inserted inside the end of the pipe. The pipe fitting of the present invention has an incore inserted into the inner surface of the end of the pipe to be connected. At the time of shipment, the incore is housed inside the fitting body. However, for example, during transportation, the incore may fall out of the fitting body and become lost. In the pipe fitting of the present invention, the incore is housed inside the fitting body at the time of shipment, and a sealant is affixed to the end face of the incore and the socket end face of the fitting body. This configuration, for example, makes it easier to suppress rattling of the incore inside the fitting body, and prevents the incore from falling out of the fitting body while reducing costs. Furthermore, because the sealant is affixed to both the end face of the incore and the socket end face of the fitting body at the time of shipment, peeling the sealant from the socket end face of the fitting body during installation may result in the incore adhering to the sealant. In this case, the incore can be removed without contaminating the interior of the fitting body because the sealant is attached to the sealant. Therefore, it is possible to reduce costs and provide a pipe joint that is easy to install and has excellent installation reliability. (2) There may be no gap between the sealing material and the receiving end surface of the joint body. With this configuration, there is no gap between the sealing material and the pipe joint, which prevents dust and dirt from entering the pipe joint, resulting in a pipe joint that is easy to install and highly reliable in installation. (3) The sealing material may have an insertion mark on the surface. The pipe with the inserted incore must be inserted to the appropriate position into the fitting body. However, if the pipe is opaque, it may be difficult to visually confirm the insertion depth of the incore, especially in dark installation locations. If the sealant has an insertion mark on its surface, the sealant can be attached to the pipe in advance so that the insertion mark matches the insertion depth of the incore, allowing the user to confirm the insertion completion position when inserting the pipe into the fitting body. This reduces the occurrence of leaks due to insufficient insertion without requiring special components. This results in a pipe fitting that is cost-effective and has excellent installation reliability. (4) The sealing material may have a seal body and at least one handle portion, and the handle portion may be semicircular with a radius of 3 mm to 8 mm. By having at least one handle portion of the sealing material, it becomes easy to peel the sealing material from the end face of the in-core and the receiving end face of the fitting body during installation. Furthermore, by making the handle portion semicircular with a radius of 3 mm to 8 mm, it becomes even easier for the worker to grasp the handle portion, and the handle portion is shaped so that it does not stick to the fitting body. This results in a pipe fitting with excellent installation properties. (5) The sealing material may have an R-shape at the connection between the handle portion and the seal body. If the connection between the handle portion and the seal body does not have an R-shape, stress will be concentrated at the connection between the handle portion and the seal body when the seal material is peeled off from the end face of the incore and the receiving end face of the fitting body. This can cause the seal material to tear. If the connection between the handle portion and the seal body has an R-shape, the stress at the connection between the handle portion and the seal body can be dispersed. This prevents the seal material from tearing. This results in a pipe fitting with excellent workability. (6) The sealing material may have a first handle portion and a second handle portion as the handle portion. The handle portion may stick to the fitting body or tear off. In such cases, it can be difficult for the worker to grasp the handle portion. If the sealing material has a first handle portion and a second handle portion as handle portions, even if one handle portion is difficult to grasp, the other handle portion can be grasped. This makes it easy to peel the sealing material from the end face of the incore and the receiving end face of the fitting body during installation. This results in a pipe fitting with excellent installation properties. [Effects of the Invention]

[0012] The present invention can provide a pipe joint that is cost-effective and has excellent workability. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an axial cross-sectional view of a pipe joint (shipped state) according to the present embodiment. FIG. [Figure 2] FIG. 2 is an exploded perspective view of the pipe joint of the present embodiment. [Figure 3] 2A and 2B are a plan view and a cross-sectional view of a sealing material according to the present embodiment. [Figure 4] 10 is an example of an insertion mark on a sealing material. [Figure 5] 2 is a view of the pipe joint of the present embodiment (shipping state) in the X direction of FIG. 1; [Figure 6] 1 is a schematic diagram showing the positional relationship between the inner core and the pipe when the inner core is inserted inside the end of the pipe. FIG. [Figure 7] 1A and 1B are schematic diagrams showing a state in which an insertion is not yet complete and a state in which an insertion is completed when a pipe into which an in-core has been inserted is inserted into a joint body. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of a pipe joint 1 according to the present invention will be described with reference to FIGS.

[0015] 1 shows a cross-sectional view of a pipe fitting 1 in a shipping state according to one embodiment of the present invention. The pipe fitting 1 in this embodiment is an external water stop fitting, and a gasket 103a of the fitting is disposed on the outside of the connected pipe P, and water is stopped by contact between the outside of the pipe P and the gasket 103a. The pipe fitting 1 is not limited to being an external water stop fitting. The pipe fitting 1 is not limited to being used in piping for passing water.

[0016] 1, the pipe fitting 1 has a fitting body 100, an in-core 105, and a sealing material 200. In the following explanation, unless otherwise specified, the configuration of the pipe fitting 1 at the time of shipment will be described. The joint body 100 is cylindrical, and is connected to a pipe P during installation. The inner core 105 is cylindrical and is housed in the joint body 100. The sealing material 200 is attached to the end face of the inner core 105 and the receiving end face 102e of the joint body 100.

[0017] Hereinafter, the direction along the central axis of the joint body 100 will be referred to as the axial direction, and the direction intersecting the central axis in a plan view of the joint body 100 from the axial direction will be referred to as the radial direction. Also, the direction going around the central axis in the plan view will be referred to as the circumferential direction.

[0018] The joint body 100 has a main body portion 101 and a cap 102. A step 113 is formed on the inner peripheral surface of the axial end portion of the main body portion 101. The step 113 protrudes radially inward from the inner peripheral surface of the main body portion 101. The step 113 is provided around the entire circumferential direction. At the step 113, the inner diameter of the main body portion 101 gradually (step-wise) decreases from the outside to the inside in the axial direction. The step 113 is abutted by the end of an inner cylindrical portion 105b of an incore 105 formed separately from the main body portion 101. Details of the incore 105 will be described later. In the following, the portion of the joint body 100 from the end of the body portion 101 to the step 113 will be referred to as the open end of the body portion 101.

[0019] An outer flange portion 101b and a male thread portion 101c are formed on the outer peripheral surface of each of both axial end portions of the main body portion 101. The outer flange portion 101b protrudes radially outward from the main body portion 101. The outer flange portion 101b extends along the entire outer circumferential surface of the main body portion 101. The male thread portion 101c is formed on the outer peripheral surface of the main body portion 101 at a portion located axially outward of the outer flange portion 101b (that is, closer to the end of the main body portion 101).

[0020] 1, the cap 102 is cylindrical in shape and has an outer diameter that gradually decreases in the axial direction. The cap 102 includes a first tube 102a having an internal thread formed on the inner circumferential surface thereof, and a second tube 102b located axially outward of the first tube 102a. The first tube 102a is threaded onto the male thread portion 101c. A step 102d is provided on the inner periphery of the cap 102 at a portion corresponding to the boundary between the first tube 102a and the second tube 102b. The step 102d extends over the entire circumferential direction. The step 102d contacts or is close to the end face of the main body 101 that faces outward in the axial direction.

[0021] The second cylinder 102b has a smaller diameter than the first cylinder 102a and extends outward in the axial direction from the first cylinder 102a. In the pipe fitting 1, an accommodating recess 106 for accommodating the watertight portion 103 and the fixing portion 104 is formed between the main body portion 101 and the cap 102. The accommodating recess 106 is formed between the step 102d and the end face of the main body portion 101 that faces outward in the axial direction. The accommodating recess 106 extends around the entire circumferential direction.

[0022] The main body 101 is formed by, for example, injection molding of a synthetic resin material, or cutting, casting, or forging of a metal material. The cap 102 is formed, for example, by injection molding of a synthetic resin material, or by cutting, casting, or forging of a metal material.

[0023] The synthetic resin material can be selected arbitrarily based on quality design depending on the application, such as cross-linked polyethylene, polybutene, polyvinyl chloride (PVC), polysulfone resin (PSU), polycarbonate resin (PC), polyamide resin (PA), polyacetal resin (POM), polyphenylsulfone resin (PPSU), polyphenylene sulfide resin (PPS), glass fiber reinforced PPS, polyvinylidene fluoride (PVDF), etc. Other processing methods such as cutting and fusion may also be used. The metal material can be arbitrarily selected from stainless steel, low alloy steel, carbon steel, low temperature carbon steel, low temperature alloy steel, brass, gunmetal, aluminum alloy, magnesium alloy, etc. based on quality design according to the intended use.

[0024] FIG. 2 is an exploded perspective view of the pipe joint of this embodiment. 2, at each axial end of the pipe fitting 1, a packing 103a, a base 103b, a retaining ring 104a (first retaining ring), a spacer 104c, and a retaining ring 104b (second retaining ring) are provided in this order toward the end of the main body 101. In other words, the fixing part 104 is located closer to the end than the watertight part 103. The packing 103a and the base 103b constitute a watertight portion 103. The watertight portion 103 prevents the contents of the pipe P from leaking out from the pipe fitting 1 after installation. The retaining ring 104a, the spacer 104c, and the retaining ring 104b constitute the fixing part 104. When installed, the pipe P inserted into the pipe fitting 1 is fixed to the pipe fitting 1 by the fixing part 104.

[0025] The packing 103a is disposed on the inner peripheral surface of the joint body 100. In the illustrated example, one packing 103a is provided, but a plurality of packings 103a may be provided spaced apart in the axial direction. The packing 103a is annular with a circular cross section. The packing 103a extends over the entire circumference. In the illustrated example, an O-ring is used as the packing 103a. The packing 103a may be made of rubber materials such as ethylene propylene diene rubber (EPDM), fluororubber (FKM), vinyl methyl silicone rubber (VMQ), acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR), or chloroprene rubber (CR).

[0026] The base 103b is disposed between the packing 103a and the retaining ring 104a. The base 103b prevents the packing 103a and the retaining ring 104a from coming into contact with each other. The base 103b is formed in an annular shape. The base 103b extends over the entire circumference. The base 103b is fitted into the open end of the main body 101. The base 103b contacts the end of the main body 101 facing outward in the axial direction. The base 103b is hooked from the outside of the main body 101 in the axial direction. The inner diameter of the base 103b is larger than the inner diameter of the packing 103a. The base 103b is formed by, for example, injection molding of a synthetic resin material, or cutting, casting, or forging of a metal material.

[0027] The synthetic resin material can be selected arbitrarily based on quality design depending on the application, such as cross-linked polyethylene, polybutene, polyvinyl chloride (PVC), polysulfone resin (PSU), polycarbonate resin (PC), polyamide resin (PA), polyacetal resin (POM), polyphenylsulfone resin (PPSU), polyphenylene sulfide resin (PPS), glass fiber reinforced PPS, polyvinylidene fluoride (PVDF), etc. Other processing methods such as cutting and fusion may also be used.

[0028] The metal material can be arbitrarily selected from stainless steel, low alloy steel, carbon steel, low temperature carbon steel, low temperature alloy steel, brass, gunmetal, aluminum alloy, magnesium alloy, etc. based on quality design according to the intended use. If the pipe joint 1 does not have the fixing portion 104, it does not have to have the base 103b.

[0029] The retaining rings 104a, 104b, and spacer 104c are disposed on the axial outside of the base 103b. The retaining rings 104a, 104b, and spacer 104c are disposed in the receiving recess 106 of the main body 101. The retaining rings 104a, 104b, and spacer 104c are disposed so as to be movable in the axial direction with a slight amount of play relative to the receiving recess 106. The retaining ring 104a (first retaining ring), spacer 104c, and retaining ring 104b (second retaining ring) are arranged in this order from the outside to the inside in the axial direction. The spacer 104c is disposed in the receiving recess 106, sandwiched axially between the two retaining rings 104a, 104b.

[0030] The inner core 105 is made of a material having higher rigidity than the material from which the pipe P is made, such as a metal material or a resin material. The synthetic resin material can be selected arbitrarily based on quality design depending on the application, such as cross-linked polyethylene, polybutene, polyvinyl chloride (PVC), polysulfone resin (PSU), polycarbonate resin (PC), polyamide resin (PA), polyacetal resin (POM), polyphenylsulfone resin (PPSU), polyphenylene sulfide resin (PPS), glass fiber reinforced PPS, polyvinylidene fluoride (PVDF), etc. Other processing methods such as cutting and fusion may also be used. The metal material can be arbitrarily selected from stainless steel, low alloy steel, carbon steel, low temperature carbon steel, low temperature alloy steel, brass, gunmetal, aluminum alloy, magnesium alloy, etc. based on quality design according to the intended use.

[0031] As shown in FIG. 1 , the incore 105 is housed in the joint body 100. The incore 105 is arranged coaxially with the joint body 100. The axial ends of the incore 105 are referred to as the first end of the incore 105 and the second end of the incore 105, respectively. When the incore 105 is housed in the joint body 100, the first end of the incore 105 is located axially outward from the second end of the incore 105. The first end of the incore 105 is located within the cap 102 (second tube 102b). The second end of the incore 105 is located within the main body 101. The second end of the incore 105 is located axially inward from the packing 103a. In the illustrated example, the second end of the incore 105 is located in a recess 113a provided in the step 113. The recess 113a is provided around the entire inner periphery of the step 113. The inner core 105 is located radially inside the packing 103a, the base 103b, the first retaining ring 104a, the spacer 104c, and the second retaining rings 104a and 104b. In this embodiment, the first end of the inner core 105 is provided with a protrusion 105a.

[0032] The inner core 105 has an inner cylindrical portion 105b and a protrusion 105a. The outer diameter of the inner cylindrical portion 105b is approximately equal to the inner diameter of the pipe P. "Approximately equal" may mean, for example, that the smaller of the outer and inner diameters is within 5% of the larger. The inner cylindrical portion 105b is a component that is inserted into the end of the pipe P during installation and suppresses radially inward deformation of the end of the pipe P. The protrusion 105a is annular and disposed at a first end of the incore 105. The protrusion 105a may be disposed closer to the first end of the incore 105 than the axial center of the incore 105. The outer diameter (maximum outer diameter) of the protrusion 105a is larger than the inner diameter (minimum inner diameter) of the main body portion 101. In this embodiment, the outer diameter of the protrusion 105a is larger than the inner diameter (minimum inner diameter) of the main body portion 101 over the entire axial length of the protrusion 105a. The outer diameter of the protrusion 105a is larger than the inner diameter of the pipe P over the entire axial length of the protrusion 105a.

[0033] FIG. 3 shows a plan view and a cross-sectional view of a sealing material 200 according to this embodiment. The sealant 200 is made up of a base material 201 and an adhesive layer 202. Of the two surfaces of the sealant 200, the base material 201 side is referred to as a front surface 201a, and the adhesive layer 202 side is referred to as a back surface 202a. As for the material of the sealing material 200, for example, the base material 201 is preferably a polypropylene-based synthetic or polyester-based synthetic paper, and the adhesive is preferably an alkaline adhesive or a rubber-based adhesive. If the adhesive is an alkaline adhesive or a rubber-based adhesive, it is possible to prevent the sealing material 200 from peeling off unintentionally by maintaining an appropriate adhesive strength.

[0034] As shown in FIG. 3, the seal material 200 has a seal body 210 and a handle portion 220. The seal body 210 is substantially circular. Here, "substantially circular" is not limited to a perfect circle, but refers to shapes including an ellipse and a polygon. The seal body 210 is provided with one notch 211 (D-cut shape). Note that the seal body 210 does not necessarily have to be provided with the notch 211. The diameter (maximum diameter) of the seal body 210 is larger than the inner diameter of the receiving end face 102e of the joint body 100. In this embodiment, the notch 211 has a shape (D-cut shape) in which a portion of the substantially circular seal body 210 is cut off in a straight line. Note that the notch 211 may also have a shape in which a portion of the substantially circular seal body 210 is cut off in a curved line. For example, the notch 211 may be cut off to form a curved line with a radius greater than the radius of the seal body 210.

[0035] The shape of the handle portion 220 is semicircular with a radius of 3 mm to 8 mm. Here, the semicircular shape is not limited to a perfect semicircle (a shape obtained by cutting a circle in half at its diameter, with a central angle of 180 degrees), but may include, for example, an approximate semicircle with a central angle slightly less than 180 degrees. Alternatively, the shape may be one in which the outer periphery in plan view has an arc portion and a straight portion, and the center of curvature of the arc portion does not lie on the straight portion. The number of handle portions 220 may be one as shown in Fig. 3(a), or may be multiple as shown in Fig. 3(b) and (c). For example, as shown in Fig. 3(b), the device may have a first handle portion 220a and a second handle portion 220b. For example, as shown in Fig. 3(c), the device may have a first handle portion 220a, a second handle portion 220b, and a third handle portion 220c.

[0036] The seal body 210 and the handle portion 220 are integrally formed. The seal body 210 and the handle portion 220 are connected at a connection portion. As shown in FIG. 3(a), in this embodiment, the connection portion 221 between the handle portion 220 and the seal body 210 has an R-shape. From the viewpoint of dispersing the stress acting on the connection portion 221 when the sealing material 200 is peeled off from the receiving end face 102e of the joint body 100, it is preferable that the shape of the connection portion 221 has an R of 0.5 mm or more. Note that the connection portion 221 protrudes radially inward in a plan view, and the center of curvature of the connection portion 221 is located on the opposite side of the sealing material 200 (outside the sealing material 200) with the connection portion 221 sandwiched therebetween. In this embodiment, a notch 211 is provided in the seal body 210, and at least one handle portion 220 (first handle portion 220a) is arranged at a position symmetrical to the notch 211 with respect to the axis A of the seal body 210.

[0037] FIG. 4 shows an example of the insertion mark 212a of the sealing material 200. Here, the central axis of the seal body 210 that is perpendicular to the notch 211 and parallel to the line T where the first handle portion 220a contacts the main body 101 is referred to as axis A, and the central axis perpendicular to axis A is referred to as axis B. As shown in FIG. 4, the sealing material 200 has an insertion mark 212a on the surface 201a. In this embodiment, the insertion mark 212a is formed by providing an attention-calling color 212 in a portion closer to the cutout 211 than the axis A. In this embodiment, the insertion mark 212a indicates the boundary between the attention-calling color 212 and the background color 213. The insertion mark 212a is perpendicular to the axis A. The arrangement and configuration of the insertion mark 212a are not limited to those described above, and various shapes and arrangements that achieve the effects of the insertion mark 212a, which will be described later, may be adopted. For example, the insertion mark 212a may be a single straight line.

[0038] As described above, the pipe fitting 1 comprises a cylindrical fitting body 100 that connects a pipe P, a cylindrical inner core 105, and a sealing material 200. At the time of shipment, the inner core 105 is housed in the fitting body 100 with the protrusion 105a facing the socket side of the fitting body 100, as shown in Figure 5, and the sealing material 200 is affixed to the end face of the inner core 105 (the end face on the side of the protrusion 105a) and the socket end face 102e of the fitting body 100.

[0039] By adopting such a configuration, for example, rattling of the inner core 105 inside the joint body 100 can be easily suppressed during shipping, and the inner core 105 can be prevented from falling out from inside the joint body 100 while keeping costs down.

[0040] At this time, it is preferable that there be no gap between the sealing material 200 and the receiving end face 102e of the fitting body 100. With this configuration, there is no gap between the sealing material 200 and the pipe fitting 1, so dust and dirt can be prevented from entering the pipe fitting 1.

[0041] (Construction procedure) Next, a procedure for installing the pipe joint 1 of this embodiment will be described.

[0042] In the pipe fitting 1 at the time of shipment, a seal material 200 is attached to the end face of the inner core 105 (the end face on the protrusion 105a side) and the socket end face 102e of the fitting body 100.

[0043] <1st process> In the first step, an installer grasps the handle portion 220 of the seal material 200 and peels the seal body 210 off the receiving end of the joint body 100 , and removes the inner core 105 from the joint body 100 .

[0044] At this time, the handle portion 220 may stick to the joint body 100, making it difficult for the installer to grasp the handle portion 220. The handle portion 220 of this embodiment has a semicircular shape with a radius of 3 mm to 8 mm. This allows the handle portion 220 to have excellent gripping properties, and also makes it difficult for the handle portion 220 to stick to the joint body 100.

[0045] The connection portion 221 between the handle portion 220 and the seal body 210 has an R-shape, which allows the stress acting on the connection portion 221 when the seal material 200 is peeled off from the socket end face 102e of the joint body 100 to be dispersed.

[0046] Furthermore, because the sealing material 200 is attached to both the end face of the incore 105 and the socket end face 102e of the joint body 100, when the sealing material 200 is peeled off from the socket end face 102e of the joint body 100 during installation, for example, the incore 105 may remain stuck to the sealing material 200. In this case, because the incore 105 remains stuck to the sealing material 200, it is possible to remove the incore 105 without contaminating the inside of the joint body 100.

[0047] When the seal body 210 is provided with the notch 211, the area of contact between the seal material 200 and the socket end face 102e of the joint body 100 can be made smaller than the area of contact between the seal material 200 and the end face of the incore 105 (protrusion 105a). This is preferable because it makes it easier to ensure that the incore 105 adheres to the seal material 200 when the seal material 200 is peeled off from the socket end face 102e of the joint body 100.

[0048] <Second process> As shown in FIG. 6, the sealing material 200 peeled off in the first step is stuck to the outer peripheral surface of the pipe P so that the insertion mark 212a coincides with the insertion depth position.

[0049] Specifically, when the sealing material 200 is attached to the pipe P before the incore 105 is inserted, the sealing material 200 is attached so that the insertion mark 212a is positioned to match the length of the inner tube portion 105b, which is the insertion depth of the incore 105, so that the insertion mark 212a can be aligned with the insertion depth position D.

[0050] With the protrusion 105a of the incore 105 abutting against the end face of the pipe P, the position where the end of the inner cylindrical portion 105b of the incore 105 is located is set to the insertion depth position D. That is, the flange portion of the incore 105 is placed against the end of the pipe, and the insertion mark 212a portion of the peeled sealing material 200 is attached to the outer peripheral surface of the pipe P so that it matches the length of the incore 105. If the pipe P is cut diagonally, the incore 105 is aligned with the longer side of the pipe P.

[0051] <3rd process> The inner core 105 is inserted into the inside of the end of the pipe P to which the sealing material 200 has been attached as described above, and the protrusion 105a of the inner core 105 is brought into contact with the end face of the pipe P.

[0052] FIG. 6 shows the relative positions of the inner core 105 and the pipe P when the inner core 105 is inserted inside the end of the pipe P. 6, with the protrusion 105a of the incore 105 abutting against the end face of the pipe P, further entry of the incore 105 into the pipe P is restricted, and the inner cylindrical portion 105b of the incore 105 is disposed within the pipe P. As a result, the protrusion 105a of the incore 105 is exposed to the outside from the pipe P. In other words, with the incore 105 inserted into the pipe P, the protrusion 105a of the incore 105 and the end face of the pipe P are aligned in this order from the outside of the pipe P along the axial direction.

[0053] <4th process> The pipe P with the inner core 105 inserted therein is inserted into the joint up to the insertion completion position.

[0054] FIG. 7 is a schematic diagram showing how the pipe P, into which the in-core 105 has been inserted, is inserted into the joint body 100 up to the insertion completion position. Specifically, the pipe P into which the incore 105 has been inserted is inserted into the joint body 100 to the insertion completion position, with the protrusion 105a of the incore 105 leading the pipe P.

[0055] Here, the completed insertion position refers to the position of the insertion mark 212a of the sealing material 200 attached to the outer peripheral surface of the pipe P. In other words, the completed insertion position refers to the portion where the end of the inner cylindrical portion 105b of the incore 105 is located when the protrusion 105a of the incore 105 is abutted against the end face of the pipe P.

[0056] 7(a) shows the pipe fitting 1 in an incompletely inserted state. In the pipe fitting 1 in an incompletely inserted state, the socket end face 102e of the fitting body 100 and the insertion mark line 212a do not coincide.

[0057] FIG. 7(b) shows the pipe fitting 1 in the fully inserted state. 7(b), when the pipe P with the inner core 105 inserted is inserted into the fitting body 100 to the insertion completion position, the protrusion 105a of the inner core 105 moves over the second retaining ring 104b, the spacer 104c, and the first retaining ring 104a in that order in the axial direction. Then, the retaining ring 104a abuts against the base 103b, and the retaining ring 104b abuts against the spacer 104c.

[0058] In the pipe fitting 1 and pipe P connected as described above, the packing 103a is in close contact (pressure-welded) with the outer peripheral surface of the pipe P. In this state, the pipe P is placed inside the fitting body 100. In the pipe fitting 1 according to this embodiment, the watertight portion 103 is made up of the packing 103a and the base 103b, which abut against the locking step 102d at the back of the fitting body 100, and obtains surface pressure from the compressive force generated when the pipe P is inserted and the compressive force generated when the pipe P expands when internal pressure is applied inside the pipe (self-watertightness), thereby sealing off water outside the pipe P (external watertightness). [Example]

[0059] Table 1 shows the size of the R of the handle portion 220 and the evaluation results of the gripping ability and application ability. The gripping ability and application ability were evaluated as follows.

[0060] <Gripability> The grippability indicates the ease of gripping the handle portion 220. The evaluation was carried out according to the following criteria. ○: When gripping the handle portion 220 and attempting to peel off the sealing material 200 from the socket end surface 102e of the joint body 100, the installer can grip the handle portion 220 and peel off the sealing material 200 from the socket end surface 102e of the joint body 100. ×: When trying to grasp the handle portion 220 and peel off the sealing material 200 from the socket end surface 102e of the joint body 100, the installer has difficulty grasping the handle portion 220, or it is difficult to grasp the handle portion 220 and peel off the sealing material 200 from the socket end surface 102e of the joint body 100.

[0061] <Applicability> The adhesion indicates the ease with which the handle portion 220 adheres to the outer peripheral surface of the joint body 100. The evaluation was carried out according to the following criteria. A: When vibration, impact, contact, etc. occurs, the handle portion 220 does not adhere to the outer circumferential surface of the joint body 100, or even if it does adhere, it quickly peels off. B: When vibration, impact, contact, etc. occurs, the handle portion 220 adheres to the outer peripheral surface of the joint body 100 and does not easily come off.

[0062] [Table 1]

[0063] As can be seen from the above results, when the R of the handle portion 220 was less than 3 mm, the adhesion was rated A, but the gripping ability was rated X. On the other hand, when the R of the handle portion 220 was more than 8 mm, the gripping ability was rated ◯, but the adhesion was rated B. When the R of the handle portion 220 was 3 mm to 8 mm, the gripping ability was evaluated as ◯ and the application ability was evaluated as A, and good results were obtained in both gripping ability and application ability.

[0064] As described above, the pipe fitting 1 of this embodiment comprises a cylindrical fitting body 100 that connects the pipe P, a cylindrical inner core 105 housed in the fitting body 100, and a sealing material 200, with the sealing material 200 attached to the end face of the inner core 105 and the receiving end face 102e of the fitting body 100, and during installation, the inner core 105 is inserted inside the end of the pipe P. The pipe fitting 1 of the present invention has an inner core 105 that is inserted into the inner surface of the end of the pipe P to be connected. At the time of shipment, the inner core 105 is housed inside the fitting body 100, but the inner core 105 may fall out from inside the fitting body 100 and become lost, for example, during transportation. In the pipe fitting 1 of the present invention, the inner core 105 is housed in the fitting body 100 at the time of shipment, and a sealant 200 is affixed to the end face of the inner core 105 and the receiving end face 102e of the fitting body 100. This configuration makes it easier to suppress rattling of the inner core 105 inside the fitting body 100, for example, and can prevent the inner core 105 from falling out from inside the fitting body 100 while keeping costs down. Furthermore, because the sealing material 200 is attached to both the end face of the incore 105 and the socket end face 102e of the fitting body 100 at the time of shipment, when the sealing material 200 is peeled off from the socket end face 102e of the fitting body 100 during installation, for example, the incore 105 may remain attached to the sealing material 200. In this case, because the incore 105 remains attached to the sealing material 200, it is possible to remove the incore 105 without contaminating the inside of the fitting body 100. This makes it possible to reduce costs and produce a pipe fitting 1 that is easy to install and highly reliable in installation.

[0065] Furthermore, there is no gap between the sealing material 200 and the socket end surface 102 e of the joint body 100 . With this configuration, there is no gap between the sealing material 200 and the pipe fitting 1, which prevents dust and dirt from entering the pipe fitting 1. Therefore, the pipe fitting 1 can be made to have excellent workability and installation reliability.

[0066] The seal material 200 may also have an insertion mark 212a on the surface 201a. The pipe P with the inserted inner core 105 is required to be inserted to an appropriate position into the fitting body 100. However, if the pipe P is opaque, it may be difficult to visually confirm the insertion depth of the inner core 105, especially in a dark installation location. If the sealing material 200 has an insertion mark 212a on its surface 201a, the sealing material 200 can be attached to the pipe P in advance so that the insertion mark 212a coincides with the insertion depth of the inner core 105. This makes it possible to confirm the insertion completion position when inserting the pipe P into the fitting body 100. This reduces the occurrence of water leakage due to insufficient insertion without requiring special components. This results in a pipe fitting 1 that is cost-effective and has excellent installation reliability.

[0067] The seal material 200 has a seal body 210 and at least one handle portion 220, and the shape of the handle portion 220 may be semicircular with a radius of 3 mm to 8 mm. By having at least one handle portion 220 in the sealing material 200, it becomes easier to peel the sealing material 200 from the end face of the incore 105 and the receiving end face 102e of the fitting body 100 during installation. Furthermore, by making the shape of the handle portion 220 semicircular with a radius of 3 mm to 8 mm, it becomes even easier for the worker to grasp the handle portion 220, and the shape of the handle portion 220 makes it less likely to stick to the fitting body 100. Therefore, it is possible to provide a pipe fitting 1 with excellent installation properties.

[0068] The seal material 200 may have an R-shape at the connection between the handle portion 220 and the seal body 210 . If the connection between the handle portion 220 and the seal body 210 does not have an R-shape, stress will concentrate at the connection between the handle portion 220 and the seal body 210 when the sealing material 200 is peeled off from the end face of the incore 105 and the receiving end face 102e of the fitting body 100. This could result in the sealing material 200 tearing. If the connection between the handle portion 220 and the seal body 210 has an R-shape, the stress associated with the connection between the handle portion 220 and the seal body 210 can be dispersed. This can prevent the sealing material 200 from tearing. This allows the pipe fitting 1 to have excellent workability.

[0069] The seal material 200 may have, as the handle portion 220, a first handle portion 220a and a second handle portion 220b. The handle portion 220 may stick to the fitting body 100 or tear off. In such cases, it may be difficult for the worker to grasp the handle portion 220. If the sealing material 200 has a first handle portion 220a and a second handle portion 220b as the handle portion 220, even if one handle portion 220 is difficult to grasp, the other handle portion 220 can be grasped. This makes it easy to peel the sealing material 200 from the end face of the incore 105 and the receiving end face 102e of the fitting body 100 during installation. Therefore, the pipe fitting 1 can be made to have excellent installation properties.

[0070] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present invention.

[0071] A gap may be provided between the sealing material 200 and the socket end surface 102 e of the joint body 100 . The connecting portion between the handle portion 220 and the seal body 210 does not have to have an R-shape. [Explanation of symbols]

[0072] Pipe fitting 1 Joint body 100 Main body 101 Socket end face 102e Incore 105 Sealant 200 Surface 201a Insertion mark line 212a Handle part 220 Pipe P

Claims

1. a cylindrical joint body for connecting pipes; a cylindrical in-core accommodated in the joint body; a sealing material; a seal material attached to the end surface of the in-core and the receiving end surface of the joint body; During installation, the in-core is inserted inside the end of the pipe. Pipe fittings.

2. There is no gap between the sealing material and the receiving end surface of the joint body.

2. The pipe fitting of claim 1.

3. The sealing material has an insertion mark on a surface.

3. A pipe joint according to claim 1 or 2.

4. The sealing material is a seal body and at least one handle portion; The shape of the handle portion is semicircular with R3 mm to R8 mm.

3. A pipe joint according to claim 1 or 2.

5. The sealing material has an R-shape at a connection portion between the handle portion and the seal body.

5. The pipe joint according to claim 4.

6. The sealing material has a first handle portion and a second handle portion as the handle portion.

5. The pipe joint according to claim 4.

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