Pipe fittings

Abstract

This disclosure aims to provide a pipe joint that facilitates the connection of pipes and prevents them from coming loose. [Solution] The pipe joint 100 comprises an outer cylinder 110 into which a resin pipe 190 is inserted from one axial direction; a claw member 160 that is held by the inner circumferential surface 116 of the outer cylinder 110 and presses against the outer circumferential surface 198 of the inserted resin pipe 190 to hold the resin pipe 190; a sealing member 170 that seals the fluid by contacting the inner circumferential surface 116 of the outer cylinder 110 and the outer circumferential surface 198 of the resin pipe 190 inserted into the outer cylinder 110; an inner cylinder member 120 that contacts the inner circumferential surface 196 of the resin pipe 190 and is capable of being reduced in diameter; and a folded portion 128 formed at the other axial end of the inner cylinder 122 that restricts the reduction in diameter of the inner cylinder 122. The inner cylinder member 120 is configured such that when the fitting member 180 fits into the groove 136 of the folded portion 128, the reduction in diameter of the folded portion 128 is restricted, and the reduction in diameter of the inner cylinder 122 is restricted.

Description

Technical Field

[0001] The present disclosure relates to a pipe joint.

Background Art

[0002] Patent Document 1 discloses a pipe joint including a joint body and an inner peripheral support member. The joint body is cylindrical, and an insertion port into which a pipe is inserted is formed at one end side, and a ring for sealing between the outer periphery of the pipe is disposed inside. The resin inner peripheral support member forms an insertion space into which the pipe is inserted between the inner periphery of the joint body, supports the pipe from the inner peripheral side, and has an air vent hole formed between the connecting portion and the ring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration described in Patent Document 1, if the gap between the inner peripheral support member and the resin pipe is small, the resistance between the resin pipe and the inner peripheral support member becomes large when the resin pipe is inserted, so an excessive force is required when connecting the resin pipe. On the other hand, if the gap between the inner peripheral support member and the resin pipe is large, the resin pipe is likely to deform inward when the resin pipe is held by the claw member after the insertion of the resin pipe is completed, and the holding force of the claw member is likely to decrease, so the resin pipe is likely to come out of the pipe joint.

[0005] An object of the present disclosure is to provide a pipe joint that facilitates the connection of a pipe and makes it difficult for the pipe to come out.

Means for Solving the Problems

[0006] The pipe joint of the first embodiment comprises an outer cylinder into which a pipe body is inserted from one axial direction; a holding member held on the inner circumferential surface of the outer cylinder and pressing against the outer circumferential surface of the pipe body inserted into the outer cylinder to hold the pipe body; a sealing member that seals fluid by contacting the inner circumferential surface of the outer cylinder and the outer circumferential surface of the pipe body inserted into the outer cylinder; an inner cylinder member that contacts the inner circumferential surface of the pipe body inserted into the outer cylinder inside the outer cylinder and is capable of being reduced in diameter; and an inner cylinder member having a restricting portion formed at the other axial end of the inner cylinder for restricting the reduction of the inner cylinder, wherein the inner cylinder member is restricted in diameter when the reduction of the restricting portion is restricted by the fitting body fitting into the fitting structure of the restricting portion.

[0007] The pipe joint according to this embodiment comprises a retaining member that presses against the outer surface of the pipe when the pipe is connected, and an inner cylinder member that contacts the inner surface of the pipe. The inner cylinder member also has a restricting portion and is capable of being reduced in diameter. When the reduction in diameter of the restricting portion is restricted, the reduction in diameter of the inner cylinder is restricted.

[0008] Therefore, with this embodiment of the pipe joint, when connecting pipes, the inner cylinder shrinks in diameter, making it easier for a gap to form between the inner surface of the pipe and the inner cylinder. In other words, when connecting pipes, friction between the pipe and the inner cylinder is easily reduced. As a result, with this embodiment of the pipe joint, it is easier to connect pipes compared to when the inner cylinder does not shrink.

[0009] Furthermore, according to this embodiment of the pipe joint, when the diameter reduction of the regulating part is restricted by the fitting body fitting into the fitted structure of the regulating part, the diameter reduction of the inner cylinder is also restricted. In other words, when the diameter reduction of the regulating part is restricted by the fitting body fitting into the fitted structure, it becomes less likely for a gap to form between the inner circumferential surface of the pipe body and the inner cylinder. As a result, according to this embodiment of the pipe joint, compared to the case where the diameter reduction of the inner cylinder is not restricted, the retaining member can more easily press the pipe body against the inner cylinder, making it less likely for the pipe body to come loose.

[0010] The pipe joint of the second embodiment is the pipe joint of the first embodiment, wherein the retaining member has a return that bites into the outer surface of the inserted pipe and restricts the movement of the inserted pipe in one direction in the axial direction.

[0011] The pipe joint according to this embodiment has a retaining member that bites into the outer surface of the pipe body inserted into the inner cylinder. The retaining member restricts the movement of the inserted pipe body in one axial direction. As a result, with the pipe joint according to this embodiment, the connected pipe body is less likely to come loose compared to when the retaining member does not have a retaining member.

[0012] The third embodiment of the pipe joint is the pipe joint described in the first or second embodiment, wherein the inner cylinder has a gap that allows for a reduction in diameter.

[0013] In this embodiment of the pipe joint, the inner cylinder has a gap, making it easier for the inner cylinder to shrink in diameter. As a result, with this embodiment of the pipe joint, it is easier to connect pipes compared to when the inner cylinder is formed around the entire circumference.

[0014] The fourth embodiment of the pipe joint is the pipe joint described in any one embodiment of the first to third embodiments, wherein the restricting portion is a folded portion that bends back from the other axial direction of the inner cylinder toward the one axial direction, the fitting structure is a groove between the outer circumferential surface of the inner cylinder formed by the folded portion and the inner circumferential surface of the folded portion, and the fitting body fits into the groove of the folded portion.

[0015] In this embodiment of the pipe joint, the restricting portion is a folded portion that is folded back in one direction in the axial direction. The groove between the outer surface of the inner cylinder formed by the folded portion and the inner surface of the folded portion forms a fitting structure. In addition, in this embodiment of the pipe joint, the fitting member fits into the groove of the folded portion. Therefore, with this embodiment of the pipe joint, the fitting body fits more easily into the groove of the folded portion, making it easier to suppress the reduction in diameter of the inner cylinder caused by the fitting body.

[0016] The fifth embodiment of the pipe joint is the pipe joint described in the fourth embodiment, wherein the folded portion has a smaller inner circumference from one side to the other in the axial direction.

[0017] In this embodiment of the pipe joint, the inner circumference of the folded portion decreases from one side in the axial direction to the other. Therefore, with this embodiment of the pipe joint, the fitting member fits in. As a result, with this embodiment of the pipe joint, the connected pipe body is less likely to come loose compared to the case where the inner circumference of the folded portion is equal in the axial direction.

[0018] The sixth embodiment of the pipe joint is a pipe joint described in any one of the first to fifth embodiments, further comprising an annular fitting member which is separate from the pipe body and is the fitting body.

[0019] The pipe joint according to this embodiment further comprises a fitting member that fits into the restricting portion. Therefore, with the pipe joint according to this embodiment, it is easier to restrict the reduction of the diameter of the restricting portion compared to when the pipe body restricts the reduction of the diameter of the restricting portion. As a result, with the pipe joint according to this embodiment, the connected pipe body is less likely to come loose compared to when the pipe body restricts the reduction of the diameter of the restricting portion.

[0020] The seventh embodiment of the pipe joint further comprises a spacer, separate from the inner cylinder member, which is annular in shape and restricts the axial movement of the sealing member, in the pipe joint described in any one of the first to sixth embodiments.

[0021] The pipe joint according to this embodiment is annular in shape and further includes a spacer separate from the inner cylinder member that restricts the axial movement of the sealing member. Therefore, with the pipe joint according to this embodiment, the design freedom of the inner cylinder member is improved compared to the case where the axial movement of the sealing member is restricted by the inner cylinder member. [Effects of the Invention]

[0022] According to this disclosure, it is possible to provide a pipe joint that makes it easy to connect pipes and prevents pipes from coming loose. [Brief explanation of the drawing]

[0023] [Figure 1]It is a diagram showing the structure of a pipe joint according to the first embodiment, and is a cross-sectional view of the pipe joint. [Figure 2] It is a diagram showing the structure of a resin pipe according to the embodiment following FIG. 1, and is an exploded perspective view of the pipe joint. [Figure 3] It is a perspective view of an inner cylinder member according to the first embodiment. [Figure 4] It is a front view of an inner cylinder member according to the first embodiment. [Figure 5] It is a perspective view of a fitting member according to the first embodiment. [Figure 6] It is a diagram showing the operation of the pipe joint according to the first embodiment, and is a cross-sectional view showing a state where a resin pipe is inserted into the pipe joint. [Figure 7] It is a diagram showing the operation of the pipe joint according to the first embodiment, and is a cross-sectional view showing a state where a resin pipe is inserted into the pipe joint and the fitting member moves toward the folded-back portion. [Figure 8] It is a diagram showing the operation of the pipe joint according to the first embodiment, and is a cross-sectional view showing a state where a resin pipe is inserted into the pipe joint and the fitting member fits into the folded-back portion. [Figure 9] It is a diagram showing a state where the fitting member fits into the folded-back portion, and is a cross-sectional view viewed from the 8A-8A direction in FIG. 8. [Figure 10] It is a diagram showing the structure of a pipe joint according to the second embodiment, and is a cross-sectional view of the pipe joint.

Modes for Carrying Out the Invention

[0024] Hereinafter, embodiments for realizing the technology of the present disclosure will be described in detail with reference to the drawings.

[0025] In addition, components and processes that perform the same functions may be given the same reference numerals throughout the drawings, and redundant explanations may be omitted as appropriate. Further, the present disclosure is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the purpose of the present disclosure.

[0026] Furthermore, the X, Y, and Z directions indicated by the arrows in each drawing are mutually orthogonal directions.

[0027] [First Embodiment] A pipe joint 100 according to the first embodiment of this disclosure will be described with reference to Figures 1 to 9.

[0028] (composition) Figure 1 shows a pipe joint 100 according to the first embodiment of the present disclosure. The pipe joint 100 according to the present embodiment comprises an outer cylinder 110, a nut 150, an inner cylinder member 120, a first spacer 140, a second spacer 142, a third spacer 144, a claw member 160, a sealing member 170, and a fitting member 180.

[0029] As shown in Figure 1, the outer cylinder 110 is a tubular member extending in the direction of arrow Z. As shown in Figures 1 and 2, a male thread 118 is formed on the outer circumferential surface 114. Also, as shown in Figures 1 and 2, the outer cylinder 110 has a shoulder portion 112 on its inner circumferential surface 116, where the inner diameter is reduced. As shown in Figure 1, the inner diameter of the shoulder portion 112 is smaller than the outer diameter of the folded portion 128 of the inner cylinder member 120, which will be described later, and the folded portion 128 of the inner cylinder member 120 abuts against it.

[0030] Arrow Z corresponds to the "axial direction" in this disclosure. Also, the left side of Figure 1 corresponds to "one axial direction" in this embodiment. In other words, the right side of Figure 1 corresponds to "the other axial direction" in this embodiment.

[0031] Note that in Figure 1, the outer cylinder 110 is omitted from the drawing on the right side. In this disclosure, including this embodiment, the other axial configuration of the outer cylinder 110 may have any shape.

[0032] As shown in Figures 1 and 2, the nut 150 is a tubular member having an internal thread 158 on its inner circumferential surface 116. More specifically, as shown in Figure 1, the nut 150 is a member having a reduced diameter portion 152 at one end of arrow Z. The internal thread 158 of the nut 150 screws onto the external thread 118 of the resin pipe 190. The internal diameter of the reduced diameter portion 152 of the nut 150 is larger than the outer circumference of the resin pipe 190 (described later), but smaller than the internal diameter of the inner circumferential surface 196 of the resin pipe 190. Therefore, when the nut 150 is assembled to the outer cylinder 110, the reduced diameter portion 152 of the nut 150 prevents other members assembled to the inner circumferential surface 116 of the outer cylinder 110 from coming off the outer cylinder 110.

[0033] As shown in Figures 1 and 2, the inner cylinder member 120 is a member that is inserted inside the outer cylinder 110. The inner cylinder member 120 also has an inner cylinder 122 extending in the direction of arrow Z, and a folded portion 128 that expands radially outward at the end in the direction of arrow Z (right side in Figure 1) and folds back toward the opposite side in the direction of arrow Z (left side in Figure 1). In other words, as shown in Figure 1, the folded portion 128 has a roughly U-shaped cross-section. When the folded portion 128 of the inner cylinder member 120 folds back, a groove 136 is formed, as shown in Figure 1.

[0034] As shown in Figures 5 and later, the inner cylinder 122 is the portion into which the resin pipe 190 connected to the pipe fitting 100 is inserted. More specifically, the outer circumferential surface 123 of the inner cylinder 122 is in contact with the inner circumferential surface 196 of the resin pipe 190, as shown in Figures 5 and later.

[0035] Furthermore, the folded portion 128 of the inner cylinder member 120 has an outer diameter (i.e., the diameter of the outer peripheral surface 134) that is slightly smaller than the inner diameter of the inner surface of the outer cylinder 110. Also, the inner diameter of the inner peripheral surface 130 of the groove 136 of the folded portion 128 is slightly larger than the outer diameter of the fitting member 180, which will be described later. In addition, the outer diameter of the outer peripheral surface 132 of the groove 136 of the folded portion 128 is slightly smaller than the inner diameter of the fitting member 180, which will be described later. For these reasons, as shown in Figure 1, the folded portion 128 of the inner cylinder member 120 fits into the outer cylinder 110 with some play and abuts against the shoulder portion 112 of the outer cylinder 110.

[0036] Furthermore, as shown in Figures 3 and 4, the inner cylinder member 120 has a gap 124 extending in the direction of arrow Z in the inner cylinder 122. Also, as shown in Figures 3 and 4, the folded portion 128 has a gap 126 extending in the direction of arrow Z. The gap 124 in the inner cylinder 122 and the gap 126 in the folded portion 128 are connected, as shown in Figures 3 and 4. Therefore, the inner cylinder member 120 is elastically deformed in a direction that reduces the gaps 124 and 126, thereby allowing the folded portion 128 and the inner cylinder 122 to be reduced in diameter. In other words, in this embodiment, the gap 124 allows the inner cylinder 122 to be reduced in diameter, and the gap 126 allows the folded portion 128 to be reduced in diameter.

[0037] The first spacer 140 is an annular member extending in the direction of arrow Z, as shown in Figures 1 and 2. More specifically, the outer diameter of the first spacer 140 is equal to the outer diameter of the outer circumferential surface 134 of the folded portion 128. In addition, the inner diameter of the first spacer 140 is equal to the inner diameter of the inner circumferential surface 130 inside the folded portion 128.

[0038] Furthermore, as shown in Figures 1 and 2, the first spacer 140 is positioned on one side in the direction of arrow Z relative to the folded portion 128. Therefore, as shown in Figure 1, the first spacer 140 fits loosely into the outer cylinder 110 and abuts against the folded portion 128 of the inner cylinder member 120.

[0039] As shown in Figure 1, the second spacer 142 is an annular member having the same outer and inner diameters as the first spacer 140. Also, as shown in Figure 1, the second spacer 142 is positioned on one side of the first spacer 140 in the direction of arrow Z via the first sealing member 170A, which will be described later.

[0040] As shown in Figure 1, the third spacer 144 is an annular member having an enlarged diameter portion whose outer diameter is equal to the outer diameter of the outer cylinder 110, and an enlarged / contracted portion whose outer diameter is equal to the inner diameter of the inner circumferential surface 116 of the outer cylinder 110. Furthermore, as shown in Figure 1, the enlarged / contracted portion of the third spacer 144 is positioned on one side in the direction of arrow Z of the second spacer 142 via the second sealing member 170B, which will be described later. Also, as shown in Figure 1, the enlarged diameter portion abuts against the end of the male thread 118 of the outer cylinder 110 in the direction of arrow Z.

[0041] The first sealing member 170A, as shown in Figures 1 and 2, is an annular and flexible member. The first sealing member 170A is a so-called O-ring, with an outer diameter slightly larger than the inner diameter of the inner circumferential surface 116 of the outer cylinder 110. Also, the inner diameter of the first sealing member 170A is slightly smaller than the outer diameter of the outer circumferential surface 198 of the resin pipe 190, which will be described later. Therefore, the sealing member 170 contacts the outer circumferential surface 198 of the resin pipe 190 and the inner circumferential surface 116 of the outer cylinder 110, preventing the fluid from leaking out in one direction in the direction of arrow Z. In other words, the first sealing member 170A seals the fluid.

[0042] In this embodiment, the sealing member 170 consists of two parts, a first sealing member 170A and a second sealing member 170B, as shown in Figure 1. The first sealing member 170A and the second sealing member 170B are equivalent components. As shown in Figure 1, the first sealing member 170A is positioned between the first spacer 140 and the second spacer 142, thereby restricting its movement in the direction of arrow Z. As shown in Figure 1, the second sealing member 170B is positioned between the second spacer 142 and the third spacer 144, thereby restricting its movement in the direction of arrow Z. In this description, when the first sealing member 170A and the second sealing member 170B are not distinguished, they are simply referred to as the sealing member 170.

[0043] As shown in Figures 1 and 2, the claw member 160 has an annular portion 162 whose outer diameter is equal to the outer diameter of the outer cylinder 110, and a claw portion 164 that protrudes radially inward from the annular portion 162 and in the direction of arrow Z. The claw member 160 is formed of a material that is elastic and does not easily deform plastically, such as stainless steel, as an example.

[0044] As shown in Figure 1, the claw member 160 is held in place by the annular portion 162 being sandwiched between the third spacer 144 and the nut 150. Furthermore, as will be described later, the inner diameter of the claw portion 164 is smaller than the outer diameter of the resin pipe 190. For this reason, when the resin pipe 190 is inserted into the pipe joint 100, the claw portion 164 easily catches on the outer surface 198 of the resin pipe 190. Note that the claw member 160 is an example of a "holding member" in this embodiment. Also, the claw portion 164 of the claw member 160 is an example of a "return" in this embodiment.

[0045] The fitting member 180 is an annular member formed from a material that does not easily deform, as shown in Figures 1, 2, and 5. Furthermore, the fitting member 180 is designed to fit into the gap 126 of the folded portion 128. The fitting member 180 is an example of a "fitting body" in this embodiment.

[0046] Furthermore, it is preferable that the fitting member 180 fits into the folded portion 128 with minimal play. Here, "minimal play" means that the relationship between the outer diameter of the outer circumferential surface 184 of the fitting member 180 and the outer circumferential surface 132 of the gap 126 of the folded portion 128 is preferably an intermediate fit or interference fit. In other words, when the fitting member 180 fits into the gap 126 of the folded portion 128, it is preferable that the outer circumferential surface 184 of the fitting member 180 is in contact with the inner circumferential surface 130 of the gap 126 of the folded portion 128.

[0047] Furthermore, it is preferable that the fitting member 180 is restricted from moving in the direction of arrow Z by the claw member 160, as shown in Figure 1, until the resin pipe 190 is inserted. More specifically, it is preferable that the fitting member 180 is positioned, as shown in Figure 1, so that the gap between the outer circumferential surface 123 of the inner cylinder 122 and other members is not exposed in one direction in the direction of arrow Z, until the resin pipe 190 is inserted. In other words, it is preferable that the inner circumferential surface of the fitting member 180 is in contact with the outer circumferential surface 123 of the inner cylinder 122. In other words, it is preferable that the relationship between the outer diameter of the inner circumferential surface 182 of the fitting member 180 and the size of the outer circumferential surface 123 of the inner cylinder 122 is a clearance fit.

[0048] Next, the process of connecting the resin pipe 190 to the pipe joint 100 in this embodiment will be explained with reference to Figures 6 to 9. Note that the resin pipe 190 is an example of a "pipe body" in this disclosure.

[0049] (Connecting the resin pipes) Figure 6 shows how the resin pipe 190 is inserted into the pipe joint 100 in this embodiment. More specifically, as shown in Figure 6, the resin pipe 190 is inserted between the outer circumferential surface 123 of the inner cylinder 122 in the inner cylinder member 120 and the outer cylinder 110. Then, as shown in Figure 6, the tip of the resin pipe 190 abuts against the fitting member 180.

[0050] Then, from the state shown in Figure 6, when the resin pipe 190 is further inserted toward the other side in the direction of arrow Z (the right side in the drawing in Figure 6), the fitting member 180 is pushed by the tip of the resin pipe 190 and is pushed toward the other side in the direction of arrow Z along the outer circumferential surface 123 of the inner cylinder 122, as shown in Figure 7. Also, as shown in Figure 7, the resin pipe 190 is held in place by the claw member 160 and the sealing member 170, and its tip is pushed toward the other side in the direction of arrow Z along the outer circumferential surface 123 of the inner cylinder 122.

[0051] Then, from the state shown in Figure 7, when the resin pipe 190 is further pushed in the other direction in the direction of arrow Z along the outer peripheral surface 123 of the inner cylinder 122, the fitting member 180 fits into the gap 126 of the folded portion 128 in the inner cylinder member 120, as shown in Figure 8. More specifically, as shown in Figure 8, the outer peripheral surface 184 of the fitting member 180 contacts the inner peripheral surface 130 of the groove 136 of the folded portion 128, and the inner peripheral surface 186 contacts the outer peripheral surface 132 of the groove 136 of the folded portion 128.

[0052] Here, as shown in Figure 9, the folded portion 128 is restricted from reducing its diameter to narrow the gap 126 because its inner circumferential surface 130 contacts the outer circumferential surface 184 of the fitting member 180. More specifically, when the inner circumferential surface 130 of the folded portion 128 contacts the fitting member 180, the fitting member 180 becomes rigid, thus restricting the folded portion 128 from reducing its circumference (i.e., reducing its diameter).

[0053] Furthermore, because the folded portion 128 restricts the reduction in diameter, the inner cylinder 122, which is connected to the folded portion 128 and the gap 126, is restricted from reducing the gap 124 in the same way as the folded portion 128. In other words, in this embodiment, the inner cylinder member 120 restricts the reduction in diameter of the inner cylinder 122 when the fitting member 180 is fitted into the groove 136 of the folded portion 128. That is, in this embodiment, the folded portion 128 is an example of a "restricting portion" in this disclosure.

[0054] On the other hand, as shown in Figures 1, 6, and 7, when the fitting member 180 is not fitted into the groove 136 of the folded portion 128, the folded portion 128 is able to reduce the size of the groove 136. Therefore, the inner cylinder 122 can be reduced in diameter until the fitting member 180 is fitted into the groove 136 of the folded portion 128.

[0055] Next, the operation and effects of the pipe joint 100 in this embodiment will be explained.

[0056] (Mechanism of Action and Effects) The pipe joint 100 according to this embodiment includes a claw member 160 that presses against the outer circumferential surface 198 of the resin pipe 190 when the resin pipe 190 is connected, and an inner cylinder member 120 in which the inner cylinder 122 contacts the inner circumferential surface 196 of the resin pipe 190. The inner cylinder member 120 also has a folded portion 128 and is capable of being reduced in diameter. When the reduction in diameter of the folded portion 128 of the inner cylinder member 120 is restricted, the reduction in diameter of the inner cylinder 122 is restricted. Therefore, according to the pipe joint 100 according to this embodiment, when connecting the resin pipe 190, the inner cylinder 122 is reduced in diameter, making it easy for a gap to be created between the inner circumferential surface 196 of the resin pipe 190 and the inner cylinder 122. In other words, when connecting the resin pipe 190, friction between the resin pipe 190 and the inner cylinder 122 is easily reduced. As a result, the pipe joint 100 according to this embodiment makes it easier to connect the resin pipe 190 compared to the case where the inner cylinder 122 does not shrink.

[0057] Furthermore, according to the pipe joint 100 of this embodiment, when the diameter reduction of the folded portion 128 is restricted by the fitting member 180 fitting into the groove 136 of the folded portion 128, the diameter reduction of the inner cylinder 122 is also restricted. In other words, when the diameter reduction of the folded portion 128 is restricted by the fitting member 180 fitting into the groove 136, a gap is less likely to occur between the inner circumferential surface 196 of the resin pipe 190 and the inner cylinder 122. As a result, in the pipe joint 100 of this embodiment, compared to the case where the diameter reduction of the inner cylinder 122 is not restricted, the claw member 160 can more easily press the resin pipe 190 against the inner cylinder 122, making it less likely for the resin pipe 190 to come loose.

[0058] Furthermore, the pipe joint 100 according to this embodiment has a claw portion 164 on the claw member 160 that bites into the outer surface 198 of the resin pipe 190 inserted into the inner cylinder 122. The claw portion 164 restricts the movement of the inserted resin pipe 190 in one direction in the direction of arrow Z. As a result, the pipe joint 100 according to this embodiment is less likely to cause the connected resin pipe 190 to come loose compared to the case where the claw member 160 does not have the claw portion 164.

[0059] Furthermore, in the pipe joint 100 according to this embodiment, the inner cylinder 122 has a gap 124, making it easier for the inner cylinder 122 to shrink in diameter. As a result, the pipe joint 100 according to this embodiment makes it easier to connect the resin pipe 190 compared to the case where the inner cylinder 122 is formed around its entire circumference.

[0060] Furthermore, in the pipe joint 100 according to this embodiment, the folded portion 128 is a folded portion 128 that is folded in one direction in the direction of arrow Z. Of the folded portion 128, the groove 136 between the outer circumferential surface 123 of the inner cylinder 122 formed by the folded portion 128 and the inner circumferential surface 130 of the folded portion 128 is an example of a fitting structure in this disclosure. In addition, in the pipe joint 100 according to this embodiment, the fitting member 180 fits into the groove 136 of the folded portion 128. Therefore, in the pipe joint 100 according to this embodiment, the fitting member 180 fits more easily into the groove 136 of the folded portion 128, making it easier to suppress the reduction in diameter of the inner cylinder 122 by the fitting member 180.

[0061] Furthermore, the pipe joint 100 according to this embodiment further includes a fitting member 180 that fits into the folded portion 128. Therefore, the pipe joint 100 according to this embodiment makes it easier to restrict the reduction of the diameter of the folded portion 128 compared to the case where the resin pipe 190 restricts the reduction of the diameter of the folded portion 128. As a result, the connected resin pipe 190 is less likely to come loose in the pipe joint 100 according to this embodiment compared to the case where the resin pipe 190 restricts the reduction of the diameter of the folded portion 128.

[0062] Furthermore, the pipe joint 100 according to this embodiment further includes a first spacer 140, which is annular in shape and separate from the inner cylinder member 120, that restricts the movement of the sealing member 170 in the direction of arrow Z. Therefore, the pipe joint 100 according to this embodiment offers improved design flexibility for the inner cylinder member 120 compared to the case where the inner cylinder member 120 restricts the movement of the sealing member 170 in the direction of arrow Z.

[0063] Next, a pipe joint 200 according to the second embodiment of this disclosure will be described with reference to Figure 10. In the pipe joint 200 according to the second embodiment, components similar to those in the pipe joint 100 according to the first embodiment are denoted by the same reference numerals as in the first embodiment, and detailed descriptions are omitted.

[0064] [Second Embodiment] (composition) Figure 10 shows a pipe joint 200 according to the second embodiment of this disclosure. As shown in Figure 10, the pipe joint 200 in this embodiment differs from the pipe joint 100 according to the first embodiment in the shape of the inner cylinder member 220.

[0065] As shown in Figure 10, in the inner cylinder member 220, the groove 136 of the folded portion 128 tapers toward the other side in the direction of arrow Z (the right side in the drawing in Figure 10). More specifically, the inner diameter of the inner circumferential surface 230 of the groove 136 of the folded portion 128 decreases as it moves toward the other side in the direction of arrow Z. In other words, as shown in Figure 10, the size of the inner circumference of the groove 136 of the folded portion 128 decreases from one side to the other in the direction of arrow Z.

[0066] Furthermore, as shown in Figure 10, the pipe joint 200 in this embodiment does not have a fitting member 180 in its structure. Therefore, when a resin pipe 190 is inserted into the pipe joint 200 in this embodiment, the tip of the resin pipe 190 fits into the groove 136 of the folded portion 128. In other words, the tip of the resin pipe 190 is an example of a "fitting body" in this embodiment.

[0067] Next, the operation and effects of the pipe joint 200 in this embodiment will be explained.

[0068] (Mechanism of Action and Effects) In the pipe joint 200 according to this embodiment, the inner circumference of the folded portion 128 decreases from one direction in the Z-direction to the other. With the pipe joint 200 according to this embodiment, the inner circumferential surface 230 of the folded portion 128 is stretched when the tip of the resin pipe 190 is fitted into it. As a result, the folded portion 128 is restricted from reducing its circumference (i.e., reducing its diameter). In other words, the tip of the resin pipe 190 is an example of a "restricting portion" in this disclosure.

[0069] As a result, the pipe joint 200 according to this embodiment is less likely to have the connected resin pipe 190 come loose compared to the case where the size of the inner circumference inside the folded portion 128 is equal in the direction of arrow Z.

[0070] [Other embodiments] In the above description, the first spacer 140, which is separate from the inner cylinder member 120, restricted the movement of the sealing member 170 in the direction of arrow Z. However, the pipe joint 100 in this disclosure is not limited to this. That is, the first spacer 140 may be molded integrally with the folded portion 128 of the inner cylinder member 120.

[0071] Furthermore, although the inner cylinder member 120 had gaps 124 and 126 in the above description, the pipe joint 100 in this disclosure is not limited to this. The inner cylinder member 120 may be configured without gaps 124 and 126, provided that a reduction in diameter is permitted. For example, instead of gaps 124 and 126 in the above description, a flexible body that allows for a reduction in diameter of the inner cylinder member 120 may be packed inside.

[0072] Furthermore, although the pipe joint 100 had a claw member 160 in the above description, the pipe joint 100 in this embodiment is not limited to this. In other words, the claw member 160 does not have to be provided on the pipe joint 100.

[0073] Furthermore, although the above description uses the resin pipe 190 as an example of a "pipe body," the pipe body used in the pipe joint 100 in this embodiment is not limited to this. In other words, in addition to resin pipe bodies, various materials such as metal and wood may be used.

[0074] While embodiments of this disclosure have been described above with reference to the attached drawings, it is clear that any person with ordinary skill in the art to which this disclosure belongs could conceive of various modifications or applications within the scope of the technical idea described in the claims, and these too are naturally understood to fall within the technical scope of this disclosure. [Explanation of symbols]

[0075] 100 Pipe fitting, 110 Outer cylinder, 112 Shoulder portion, 114 Outer surface, 116 Inner surface, 120 Inner cylinder member, 122 Inner cylinder, 123 Outer surface, 124 Gap, 126 Gap, 128 Part, 130 Inner surface, 132 Outer surface, 134 Outer surface, 136 Groove, 140 First spacer (example of spacer), 142 Second spacer, 144 Third spacer, 150 Nut, 152 Reduced diameter portion, 160 Claw member (holding member), 162 Annular portion, 164 Claw portion, 170 Sealing member, 180 Fitting member, 182 Outer surface, 184 Outer surface, 186 Inner surface, 190 Resin pipe (example of pipe body), 196 Inner surface, 198 Outer surface, 200 Pipe fitting, 220 Inner cylinder member, 230 inner circumferential surface

Claims

1. An outer cylinder into which the tubular body is inserted from one side in the axial direction, A holding member that is held on the inner circumferential surface of the outer cylinder and presses against the outer circumferential surface of the pipe inserted into the outer cylinder to hold the pipe, A sealing member that contacts the inner circumferential surface of the outer cylinder and the outer circumferential surface of the pipe inserted into the outer cylinder to seal the fluid, An inner cylinder having a regulating portion formed at the other end of the inner cylinder in the axial direction that restricts the reduction of the inner cylinder, and which is in contact with the inner circumferential surface of a pipe inserted into the outer cylinder on the inside of the outer cylinder and can be reduced in diameter, Equipped with, The inner cylinder member is such that when the fitting body fits into the fitting structure of the restricting portion, the reduction in diameter of the restricting portion is restricted, the reduction in diameter of the inner cylinder is restricted. Pipe fittings.

2. The retaining member has a barb that bites into the outer surface of the inserted pipe and restricts the movement of the inserted pipe in one direction in the axial direction. A pipe fitting according to claim 1.

3. The inner cylinder has a gap that allows for a reduction in diameter. A pipe fitting according to claim 1.

4. The restricting portion is a folded portion that bends back from the other axial direction of the inner cylinder toward the one axial direction, The fitting structure is a groove between the outer circumferential surface of the inner cylinder formed by the folded portion and the inner circumferential surface of the folded portion. The fitting body fits into the groove of the folded portion, A pipe fitting according to claim 1.

5. The folded portion has an inner circumference that decreases from one side to the other in the axial direction. A pipe fitting according to claim 4.

6. It is separate from the aforementioned tubular body and further comprises an annular fitting member which is the fitting body. A pipe fitting according to claim 1.

7. The device further includes a spacer, separate from the inner cylinder member, which is annular in shape and restricts the axial movement of the sealing member. A pipe fitting according to any one of claims 1 to 6.

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