Pipe joint and seal member

Abstract

To provide a pipe joint and a seal member capable of efficiently performing joint work between a spigot of a pipe and a socket of a joined pipe.SOLUTION: A pipe joint 1 has a seal member 10 including an annular valve portion 11, and a lock ring portion 14 having flexibility lower than that of the valve portion 11 and connected to a straight pipe portion 21 side in an axial direction of a joined pipe 20 with respect to the valve portion 11. The joined pipe 20 has a first socket engagement portion 26a which can be engaged with the lock ring portion 14 on an inner peripheral surface of a socket 22. The lock ring portion 14 is engaged with the first socket engagement portion 26a when the valve portion 11 is moved in a direction in which the valve portion 11 is pulled out from the socket 22 of the joined pipe 20, and is engaged with the first socket engagement portion 26a and a spigot engagement portion 33 of a spigot 32 when the spigot 32 of a pipe 30 is moved in a direction in which the spigot 32 is pulled out from the socket 22 of the joined pipe 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pipe joint and a sealing member having an insertion port of a pipe, a receiving port of a pipe to be joined into which the insertion port of the pipe is inserted, and a sealing member that seals between an outer peripheral surface of the insertion port of the pipe and an inner peripheral surface of the receiving port of the pipe to be joined.

Background Art

[0002] In laying work of ductile cast iron pipes (an example of water pipes) having an insertion port and a receiving port, a pipe joining operation for joining a pipe to a pipe to be joined arranged in a trench in the ground is performed. In this pipe joining operation, an operator first needs to suspend the pipe to be joined to the pipe in the trench. Thereafter, the operator needs to align the pipe and the pipe to be joined in the trench, insert the insertion port of the pipe into the receiving port of the pipe to be joined, and join the insertion port and the receiving port.

[0003] In such a conventional pipe joining operation, the operator needs to manually align the pipe and the pipe to be joined while checking the position of the pipe with respect to the pipe to be joined in the trench.

[0004] As described above, in the conventional pipe joining operation, since the work burden on the operator is large and the work needs to be performed in a narrow trench, the workability is not very good.

[0005] Further, at the joint portion between the pipe and the pipe to be joined, a pipe joint is formed in which the insertion port of the pipe is inserted into the receiving port of the pipe to be joined. The pipe joint has a sealing material for sealing a fluid flowing through the pipe and a lock ring for preventing the insertion port of the pipe from detaching from the receiving port of the pipe to be joined. In such a pipe joint, in order to properly join the pipe and the pipe to be joined while maintaining the detachment prevention function of the lock ring well, it is necessary to position the lock ring and the pipe with respect to the pipe to be joined.

[0006] On the other hand, for example, Patent Document 1 discloses a detachment prevention pipe joint having a lock ring centering member for centering a lock ring with respect to a receiving port of a pipe to be joined. By using the lock ring centering member, the detachment prevention pipe joint can perform centering of the lock ring well. By using this detachment prevention pipe joint, the pipe and the pipe to be joined can be satisfactorily joined without managing the posture of the lock ring.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Incidentally, in the detachment prevention pipe joint disclosed in Patent Document 1, with the lock ring fitted in the lock ring accommodation groove of the receiving port of the pipe to be joined and the sealing material fitted in the sealing material accommodation groove of the receiving port of the pipe to be joined, the insertion port of the pipe is inserted into the receiving port of the pipe to be joined. Since the sealing material is made of a highly flexible rubber material or the like, when a large force is applied from the insertion port of the pipe during the joining operation, it is likely to come out of the sealing material accommodation groove due to elastic deformation. Therefore, it was necessary to carefully insert the pipe so that the position of the sealing material does not shift in a state where the insertion port of the pipe and the receiving port of the pipe to be joined are aligned.

[0009] On the other hand, there is a demand for a pipe joint and a sealing member that can efficiently perform the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined.

[0010] An object of the present invention is to realize a configuration that can efficiently perform the joining operation between the insertion port of a pipe, the receiving port of a pipe to be joined into which the insertion port of the pipe is inserted, and a sealing member that seals between the outer peripheral surface of the insertion port of the pipe and the inner peripheral surface of the receiving port of the pipe to be joined, in a pipe joint and a sealing member.

Means for Solving the Problem

[0011] A pipe joint according to an embodiment of the present invention includes an insertion port of a pipe, a receiving port of a pipe to be joined into which the insertion port of the pipe is inserted, and a sealing member that seals between an outer peripheral surface of the insertion port of the pipe and an inner peripheral surface of the receiving port of the pipe to be joined. The sealing member of this pipe joint has an annular valve portion whose outer peripheral surface is pressed against the inner peripheral surface of the receiving port of the pipe to be joined and whose inner peripheral surface is pressed against the outer peripheral surface of the insertion port of the pipe, and a lock ring portion that has a lower flexibility than the valve portion and is connected to the valve portion on the straight pipe portion side in the axial direction of the pipe to be joined. The pipe has an insertion port engaging portion on the outer peripheral surface of the insertion port that can engage with the lock ring portion. The pipe to be joined has a first receiving port engaging portion on the inner peripheral surface of the receiving port that can engage with the lock ring portion. The lock ring portion engages with the first receiving port engaging portion when the valve portion moves in a direction of coming out of the receiving port of the pipe to be joined, and engages with the first receiving port engaging portion and the insertion port engaging portion when the insertion port of the pipe moves in a direction of coming out of the receiving port of the pipe to be joined (first configuration).

[0012] In the above configuration, a lock ring portion is connected to a valve portion that seals between the inner peripheral surface of the receiving port of the pipe to be joined and the outer peripheral surface of the insertion port of the pipe. Further, the lock ring portion is configured to be able to engage with the first receiving port engaging portion of the pipe to be joined and the insertion port engaging portion of the pipe. By being connected to the valve portion, the lock ring portion can restrict not only the axial movement of the insertion port of the pipe but also the axial movement of the valve member.

[0013] The pipe joint having the above configuration is prevented by the lock ring portion from the valve portion coming out of the receiving port of the pipe to be joined and the insertion port of the pipe coming out. Further, it is not necessary to incorporate a lock ring separately from the sealing member into the receiving port of the pipe to be joined. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be performed efficiently.

[0014] Therefore, it is possible to realize a pipe joint that can efficiently perform the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined.

[0015] In the first configuration, the lock ring portion includes a first lock portion located on the straight pipe portion side of the pipe to be joined, and a second lock portion located on the receiving port side of the pipe to be joined and radially outward of the first lock portion. The first lock portion engages with the insertion port engaging portion when the insertion port of the pipe moves in a direction in which it comes out of the receiving port of the pipe to be joined. The second lock portion engages with the first receiving port engaging portion when the valve portion moves in a direction in which it comes out of the receiving port of the pipe to be joined, and when the insertion port of the pipe moves in a direction in which it comes out of the receiving port of the pipe to be joined (second configuration).

[0016] The lock ring portion prevents the valve portion and the insertion port of the pipe from coming out of the receiving port of the pipe to be joined by the second lock portion, and prevents the insertion port of the pipe from coming out by the first lock portion. Thus, the pipe joint prevents the valve portion from coming out of the receiving port of the pipe to be joined and the insertion port of the pipe from coming out by inserting the seal member to which the lock ring portion is connected into the receiving port of the pipe to be joined. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be efficiently performed.

[0017] In the second configuration, the receiving port of the pipe to be joined has a second receiving port engaging portion on the inner peripheral surface on the straight pipe portion side in the axial direction with respect to the first receiving port engaging portion. The lock ring portion has a third lock portion located between the first lock portion and the second lock portion. The third lock portion engages with the second receiving port engaging portion when the valve portion moves to the straight pipe portion side of the pipe to be joined (third configuration).

[0018] In the above configuration, when joining the insertion port of the pipe and the receiving port of the pipe to be joined, the valve portion seals the space between the inner peripheral surface of the receiving port of the pipe to be joined and the outer peripheral surface of the insertion port of the pipe, and the lock ring portion holds the axial position of the valve portion located on the inner peripheral surface of the receiving port of the pipe to be joined. Therefore, when inserting the insertion port of the pipe into the valve portion, the engagement between the lock ring portion and the receiving port engaging portion prevents displacement of the valve portion with respect to the receiving port of the pipe to be joined. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be performed efficiently.

[0019] In the first configuration, the sealing member has flexibility and further has a connecting portion that connects the valve portion and the lock ring portion (fourth configuration).

[0020] The lock ring portion can adjust the position with respect to the valve portion held in the receiving port of the pipe to be joined by elastic deformation of the connecting portion. Therefore, it is easy to arrange the valve portion and the lock ring portion in the receiving port of the pipe to be joined. Further, since the lock ring portion moves following the insertion port of the pipe, it is easy to insert the insertion port of the pipe into the valve portion. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be performed efficiently.

[0021] In the second configuration, the lock ring portion is formed of an arcuate plate-like member when viewed in the axial direction. It is located radially outward of the valve portion as it goes from the first lock portion to the second lock portion. The first lock portion is located radially inward of the outer peripheral surface of the valve portion and radially outward of the inner peripheral surface of the valve portion. The second lock portion is located radially outward of the outer peripheral surface of the valve portion (fifth configuration).

[0022] Since the first locking portion, which is farther from the valve portion than the first locking portion in the axial direction of the valve portion, is located radially inward of the valve portion with respect to the second locking portion, it is easy to insert the sealing member into the receiving port of the pipe to be joined. Further, the second locking portion engages with the first receiving port engaging portion of the pipe to be joined, and the first locking portion engages with the insertion port engaging portion of the insertion port of the pipe. Therefore, detachment between the pipe and the pipe to be joined is prevented without incorporating a locking ring, and displacement and removal of the valve portion are prevented. As a result, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be efficiently performed.

[0023] The sealing member according to an embodiment of the present invention is a sealing member that seals between the outer peripheral surface of the insertion port of the pipe and the inner peripheral surface of the receiving port of the pipe to be joined into which the insertion port of the pipe is inserted. The sealing member includes an annular valve portion having a sealing property, and a locking ring portion having a flexibility lower than that of the valve portion and configured to prevent the insertion port of the pipe joined to the receiving port of the pipe to be joined from detaching from the receiving port. The locking ring portion is connected to the valve portion in the axial direction of the valve portion (sixth configuration).

[0024] In the above configuration, the sealing member is configured to be able to seal between the inner peripheral surface of the receiving port of the pipe to be joined and the outer peripheral surface of the insertion port of the pipe by the valve portion. Further, the sealing member has a function of holding the position of the valve portion with respect to the pipe to be joined by the locking ring portion connected to the valve portion. Therefore, the sealing member seals between the insertion port of the pipe and the receiving port of the pipe to be joined by the valve portion, and the locking ring portion prevents the valve portion from coming out of the receiving port of the pipe to be joined and the insertion port of the pipe from coming out of the receiving port of the pipe to be joined. As a result, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be efficiently performed.

[0025] In the sixth configuration, the sealing member has flexibility and further includes a connecting portion that connects the valve portion and the locking ring portion (seventh configuration).

[0026] The locking ring portion can adjust the position with respect to the valve portion held in the receiving port of the pipe to be joined due to the elastic deformation of the connecting portion. Therefore, it is easy to arrange the valve portion and the locking ring portion in the receiving port of the pipe to be joined. Also, it is easy to insert the insertion port of the pipe into the valve portion. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be performed efficiently.

[0027] In the sixth configuration, the locking ring portion is composed of an arcuate plate-like member when viewed in the axial direction, and has a first locking portion and a second locking portion located on the valve portion side rather than the first locking portion. The first locking portion is located radially inward of the valve portion with respect to the outer peripheral surface of the valve portion and radially outward of the inner peripheral surface of the valve portion. The second locking portion is located radially outward of the outer peripheral surface of the valve portion. (Eighth configuration).

[0028] Since the first locking portion, which is axially separated from the valve portion rather than the second locking portion, is located radially inward of the second locking portion, it is easy to insert a sealing member into the receiving port of the pipe to be joined. Also, the second locking portion, which is located radially outward of the valve portion, engages with the receiving port of the pipe to be joined, which is located radially outward of the outer peripheral surface of the valve portion, and the first locking portion is configured to engage with the insertion port of the pipe, which is located radially outward of the inner peripheral surface of the valve portion. Therefore, detachment between the pipe and the pipe to be joined is prevented without incorporating a locking ring, and displacement and removal of the valve portion are prevented. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be performed efficiently.

[0029] In the eighth configuration, the locking ring portion has a third locking portion located between the first locking portion and the second locking portion. (Ninth configuration).

[0030] In the above configuration, the seal member prevents the insertion port of the pipe joined to the receiving port of the pipe to be joined from detaching by the first locking portion, and prevents the axial movement of the valve portion by the second locking portion and the third locking portion. Therefore, the seal member has a valve portion holding function of the receiving port of the pipe to be joined in addition to the function of the locking ring by the first locking portion, the second locking portion, and the third locking portion. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be efficiently performed.

Effect of the Invention

[0031] The pipe joint according to an embodiment of the present invention includes an annular valve portion whose outer peripheral surface is pressed against the inner peripheral surface of the receiving port of the pipe to be joined and whose inner peripheral surface is pressed against the outer peripheral surface of the insertion port of the pipe, and a locking ring portion that has a lower flexibility than the valve portion and is connected to the straight pipe portion side in the axial direction of the pipe to be joined with respect to the valve portion.

[0032] For the pipe joint and the seal member having the above configuration, it is not necessary to incorporate a locking ring separately from the seal member into the receiving port of the pipe to be joined. Thereby, the joining operation between the insertion port of the pipe and the receiving port of the pipe to be joined can be efficiently performed.

Brief Description of the Drawings

[0033]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

[0034] Hereinafter, each embodiment will be described with reference to the drawings. In each figure, the same reference numerals are given to the same parts, and the description of the same parts will not be repeated. Note that the dimensions of the constituent members in each figure do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of the constituent members.

[0035] In the following description, the axial direction means the direction in which the axis L1 of the pipe to be joined extends. The left-right direction means the horizontal direction and the direction perpendicular to the axial direction. The horizontal direction includes not only the strict horizontal direction but also the direction intersecting the vertical direction.

[0036] Also, in the following description, expressions such as "fix", "connect", and "attach" (hereinafter, "fix", etc.) include not only the case where members are directly fixed, etc., but also the case where they are fixed, etc. via other members. That is, in the following description, the expressions of "fix", etc. include the meanings of direct and indirect fixing, etc. of members to each other.

[0037] (Pipe Joint) FIG. 1 is a cross-sectional view showing a schematic configuration of a pipe joint 1 according to an embodiment of the present invention. FIG. 2 is a side view of a seal member 10 according to an embodiment of the present invention. FIG. 3 is a front view of the seal member 10. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged cross-sectional view showing a schematic configuration of the pipe joint 1.

[0038] As shown in Fig. 1, the pipe joint 1 is a portion for joining the pipe 30 and the pipe to be joined 20 by inserting the insertion port 32 of the pipe 30 into the receiving port 22 of the pipe to be joined 20 through the sealing member 10. The pipe joint 1 is used, for example, for joining the pipe to be joined 20 and the pipe 30 laid in a groove.

[0039] The pipe to be joined 20 and the pipe 30 are, for example, water pipes. The pipe to be joined 20 and the pipe 30 may be pipes other than water pipes, such as sewer pipes, agricultural water pipes, and gas pipes. The pipe to be joined 20 and the pipe 30 may be ductile cast iron pipes, other metal pipes, or resin pipes.

[0040] The insertion port 32 of the pipe 30 is inserted into the receiving port 22 of the pipe to be joined 20 through the sealing member 10 in a state where the axis L2 of the insertion port 32 of the pipe 30 is position-adjusted with respect to the axis L1 of the receiving port 22 of the pipe to be joined 20. Specifically, as shown in Fig. 1, the pipe joint 1 has a sealing member 10, a receiving port 22 of the pipe to be joined 20, and an insertion port 32 of the pipe 30.

[0041] (Sealing member) As shown in Figs. 2 to 5, the sealing member 10 is disposed between the outer peripheral surface of the insertion port 32 of the pipe 30 and the inner peripheral surface of the receiving port 22 of the pipe to be joined 20. The sealing member 10 has a valve portion 11, a lock ring portion 14, and a connecting portion 15.

[0042] The valve portion 11 seals between the outer peripheral surface of the insertion port 32 of the pipe 30 and the inner peripheral surface of the receiving port 22 of the pipe to be joined 20 into which the insertion port 32 of the pipe 30 is inserted. The valve portion 11 has an annular shape. The valve portion 11 is made of a flexible material such as styrene-butadiene rubber. The valve portion 11 has an outer water stop surface 12 and an inner water stop surface 14. The outer water stop surface 12 and the inner water stop surface 14 are formed during the molding and vulcanization of the valve portion.

[0043] The outer sealing surface 12 is a surface configured to exhibit sealing performance with the inner peripheral surface of the mating socket 22 in contact therewith. The outer sealing surface 12 is located on the outer peripheral surface of the valve portion 11. The outer sealing surface 12 is a cylindrical surface capable of contacting the inner peripheral surface of the socket 22 of the joined pipe 20. The outer diameter of the outer sealing surface 12 is larger than the inner diameter of the socket 22 of the joined pipe 20. Therefore, when the valve portion 11 is disposed in the socket 22 of the joined pipe 20, the outer sealing surface 12 is configured to be pressed against the inner peripheral surface of the socket 22 by elastic deformation.

[0044] The outer sealing surface 12 has valve portion positioning surfaces 12a and 12b. The valve portion positioning surfaces 12a and 12b position the axial position of the valve portion 11 with respect to the socket 22 of the joined pipe 20. The valve portion positioning surfaces 12a and 12b are respectively located at both axial ends of the outer peripheral surface of the valve portion 11. The valve portion positioning surfaces 12a and 12b are tapered surfaces that are radially inward as they face the end surfaces of the valve portion 11. The valve portion positioning surfaces 12a and 12b are configured to be respectively pressed against the socket positioning surfaces 25b and 25c located on the inner peripheral surface of the socket 22 when the valve portion 11 is disposed in the socket 22 of the joined pipe 20.

[0045] The inner sealing surface 13 is a surface configured to exhibit sealing performance with the outer peripheral surface of the insertion port 32 of the pipe 30. The inner sealing surface 13 is located on the inner peripheral surface of the valve portion. The inner sealing surface 13 is a tapered surface that is radially inward from one axial end to the other axial end of the valve portion 11. That is, the inner diameter of the inner sealing surface 13 decreases from one side to the other side of the valve portion 11. The largest inner diameter of the inner sealing surface 13 is larger than the outer diameter of the insertion port 32 of the pipe 30. The smallest inner diameter of the inner sealing surface 13 is smaller than the outer diameter of the insertion port 32. Therefore, when the insertion port 32 is inserted into the valve portion 11, at least a portion of the inner sealing surface 13 that is smaller than the outer diameter of the insertion port 32 is configured to be pressed against the outer peripheral surface of the insertion port 32 by elastic deformation.

[0046] When the valve portion 11 configured as described above is disposed in the receiving port 22 of the pipe 20 to be joined, the outer sealing surface 12 is pressed against the inner peripheral surface of the receiving port 22, so that the outer sealing surface 12 and the inner peripheral surface of the receiving port 22 are in close contact with each other to prevent the entry of fluids, solids, etc. between them. Further, when the insertion port 32 of the pipe 30 is inserted into the valve portion 11, the inner sealing surface 13 is pressed against the outer peripheral surface of the insertion port 32, so that the inner sealing surface 13 and the outer peripheral surface of the insertion port 32 are in close contact with each other to prevent the entry of fluids, solids, etc. between them. Therefore, the valve portion 11 has a sealing property for sealing between the inner peripheral surface of the receiving port 22 of the pipe 20 to be joined and the outer peripheral surface of the insertion port 32 of the pipe 30.

[0047] The lock ring portion 14 prevents the insertion port 32 of the pipe 30 joined to the receiving port 22 of the pipe 20 to be joined from detaching from the receiving port 22. The lock ring portion 14 is made of a material having a lower flexibility than that of the valve portion 11. The lock ring portion 14 is made of, for example, a metallic material such as stainless steel. The lock ring portion 14 is an arcuate plate-like member in which one portion of an annular member is cut (see FIG. 3). Therefore, the lock ring portion 14 is configured such that its inner diameter expands by elastic deformation.

[0048] The lock ring portion 14 has a first lock portion 14a, a second lock portion 14b, and a third lock portion 14c. The first lock portion 14a is located at one axial end portion of the lock ring portion 14. In the present embodiment, the first lock portion 14a is an arcuate end surface on one axial side of the lock ring portion 14. The second lock portion 14b is located at the other axial end portion of the lock ring portion 14. In the present embodiment, the first lock portion 14a is an arcuate end surface on the other axial side of the lock ring portion 14. Further, the first lock portion 14a is located radially inward of the lock ring portion 14 with respect to the second lock portion 14b. Therefore, the lock ring portion 14 has a tapered surface that is located radially outward of the lock ring portion 14 as it extends from the first lock portion 14a toward the second lock portion 14b. The third lock portion 14c is located between the first lock portion 14a and the second lock portion 14b. That is, the third lock portion 14c is a part of the tapered surface between the first lock portion 14a and the second lock portion 14b.

[0049] The lock ring portion 14 is connected to the valve portion 11 by the connection portion 15. The connection portion 15 is a member having flexibility such as styrene-butadiene rubber. The connection portion 15 connects the end face with the smaller inner diameter in the valve portion 11 and the inner peripheral surface with the larger outer diameter in the lock ring portion 14. At this time, the lock ring portion 14 is connected to the valve portion 11 so that the axis of the valve portion 11 and the axis of the lock ring portion 14 coincide.

[0050] The first lock portion 14a is located radially inward of the valve portion 11 with respect to the outer peripheral surface of the valve portion 11 and radially outward of the valve portion 11 with respect to the smallest inner diameter portion of the inner peripheral surface of the valve portion 11. The first lock portion 14a is smaller than the outer diameter of the valve portion 11 and is configured to contact the outer diameter of the insertion port 32 when the insertion port 32 of the pipe 30 having an outer diameter larger than the smallest inner diameter of the valve portion 11 is inserted into the valve portion 11. That is, the first lock portion 14a is configured to be engageable with the insertion port engaging portion 33 (see FIG. 1) protruding from the outer peripheral surface of the insertion port 32.

[0051] The second lock portion 14b is located radially outward of the valve portion 11 with respect to the outer peripheral surface of the valve portion 11. Therefore, the second lock portion 14b is configured to contact the inner diameter of the receiving port 22 when the valve portion 11 is inserted into the receiving port 22 having an inner diameter smaller than the outer diameter of the valve portion 11. That is, the second lock portion 14b is configured to be engageable with the receiving port 22.

[0052] In the present embodiment, the sealing member 10 seals between the outer peripheral surface of the insertion port 32 of the pipe 30 and the inner peripheral surface of the receiving port 22 of the pipe to be joined 20. The sealing member 10 includes an annular valve portion 11 having a sealing property, and a lock ring portion 14 having a lower flexibility than the valve portion 11 and configured to prevent the insertion port 32 of the pipe 30 joined to the receiving port 22 of the pipe to be joined 20 from detaching from the receiving port 22. The lock ring portion 14 is connected to the valve portion 11 in the axial direction of the valve portion 11.

[0053] Further, in the present embodiment, the seal member 10 has flexibility and further has a connecting portion 15 that connects the valve portion 11 and the lock ring portion 14.

[0054] Further, in the present embodiment, the lock ring portion 14 is composed of an arcuate plate-like member when viewed in the axial direction of the valve portion 11. The lock ring portion 14 has a first lock portion 14a and a second lock portion 14b located closer to the valve portion 11 side than the first lock portion 14a. The lock ring portion 14 is located radially outward of the valve portion 11 as it extends from the first lock portion 14a toward the second lock portion 14b. The first lock portion 14a is located radially inward of the outer peripheral surface of the valve portion 11 and radially outward of the inner peripheral surface of the valve portion 11. The second lock portion 14b is located radially outward of the outer peripheral surface of the valve portion 11.

[0055] In the above configuration, the seal member 10 has a function of sealing between the inner peripheral surface of the receiving port 22 of the pipe to be joined 20 and the outer peripheral surface of the insertion port 32 of the pipe 30 by the valve portion 11. Further, the seal member 10 has a function of preventing the valve portion 11 from detaching from the receiving port 22 of the pipe to be joined 20 and the insertion port 32 of the pipe 30 from detaching from the receiving port 22 of the pipe to be joined 20 by the first lock portion 14a and the second lock portion 14b of the lock ring portion 14. Furthermore, the seal member 10 has a function of holding the position of the valve portion 11 with respect to the pipe to be joined 20 by the second lock portion 14b of the lock ring portion 14 connected to the valve portion 11 by the pipe to be joined 20. Therefore, when the seal member 10 is disposed between the receiving port 22 of the pipe to be joined 20 and the insertion port 32 of the pipe 30, the valve portion 11 seals between the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe to be joined 20, and the lock ring portion 14 prevents the valve portion 11 from coming out of the receiving port 22 of the pipe to be joined 20 and the insertion port 32 of the pipe 30 from coming out of the receiving port 22 of the pipe to be joined 20.

[0056] The lock ring portion 14 can adjust the position with respect to the valve portion 11 held by the receiving port 22 of the pipe to be joined 20 due to the elastic deformation of the connecting portion 15. Therefore, it is easy to dispose the valve portion 11 and the lock ring portion 14 in the receiving port 22 of the pipe to be joined 20. Also, it is easy to insert the insertion port 32 of the pipe 30 into the valve portion 11.

[0057] Further, since the first locking portion 14a that is axially separated from the valve portion 11 farther than the second locking portion 14b is located radially inward of the valve portion 11 with respect to the second locking portion 14b, it is easy to insert the sealing member 10 into the receiving port 22 of the joined pipe 20. Also, the second locking portion 14b that is located radially outward of the valve portion 11 engages with the receiving port 22 of the joined pipe 20 that is located radially outward of the outer peripheral surface of the valve portion 11, and the first locking portion 14a is configured to engage with the insertion port 32 of the pipe 30 that is located radially outward of the inner peripheral surface of the valve portion 11. Therefore, detachment between the pipe 30 and the joined pipe 20 is prevented without incorporating a locking ring, and displacement and removal of the valve portion 11 are prevented. As a result, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the joined pipe 20 can be performed efficiently.

[0058] Also, in the present embodiment, the locking ring portion 14 has a third locking portion 14c located between the first locking portion 14a and the second locking portion 14b.

[0059] In the above-described configuration, the sealing member 10 prevents detachment of the insertion port 32 of the pipe 30 joined to the receiving port 22 of the joined pipe 20 by the first locking portion 14a, and prevents axial movement of the valve portion 11 by the second locking portion 14b and the third locking portion 14c. Therefore, the sealing member 10 has a rubber ring holding function of the receiving port 22 of the joined pipe 20 in addition to the function of the locking ring by the first locking portion 14a, the second locking portion 14b, and the third locking portion 14c. As a result, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the joined pipe 20 can be performed efficiently.

[0060] (Pipe joint) As shown in FIG. 5, the receiving port 22 of the pipe 20 to be joined is the portion into which the insertion port 32 of the pipe 30 is inserted. The receiving port 22 has a cylindrical shape extending in the axial direction of the straight pipe portion 21 from one end side of the straight pipe portion 21 (see FIG. 1). That is, the base end portion 23 of the receiving port 22 is connected to the straight pipe portion 21. Further, the outer peripheral surface of the receiving port 22 is a tapered surface whose outer diameter increases from the base end portion 23 toward the tip end portion 24.

[0061] Also, the inner diameter of the receiving port 22 is larger than the inner diameter of the straight pipe portion 21. Therefore, the inner peripheral surface of the base end portion 23 of the receiving port 22 and the inner peripheral surface of one end side of the straight pipe portion 21 are connected via an annular stepped surface.

[0062] The receiving port 22 has a valve portion accommodating portion 25, a lock ring portion accommodating portion 26, a relief portion 27, and a guide portion 28 on its inner peripheral surface. The valve portion accommodating portion 25, the lock ring portion accommodating portion 26, the relief portion 27, and the guide portion 28 are formed with a predetermined machining accuracy by machining after casting. The valve portion accommodating portion 25, the lock ring portion accommodating portion 26, the relief portion 27, and the guide portion 28 are located on the inner peripheral surface of the receiving port 22 in the order of the valve portion accommodating portion 25, the lock ring portion accommodating portion 26, the relief portion 27, and the guide portion 28 from the tip end portion 24 side of the receiving port 22.

[0063] The valve portion accommodating portion 25 is an annular recess recessed radially outward along the circumferential direction of the inner peripheral surface of the receiving port 22. The valve portion accommodating portion 25 is located at the position closest to the tip end portion 24 of the receiving port 22 among the valve portion accommodating portion 25, the lock ring portion accommodating portion 26, the relief portion 27, and the guide portion 28. The valve portion accommodating portion 25 has a receiving port water stop surface 25a and receiving port positioning surfaces 25b, 25c.

[0064] The receiving port sealing surface 25a is a surface configured to exhibit sealing performance between the outer sealing surface 12 of the valve portion 11. The receiving port sealing surface 25a is located on the inner circumferential surface which is the bottom surface of the valve portion accommodating portion 25. The receiving port sealing surface 25a is a cylindrical surface capable of contacting the outer sealing surface 12. The inner diameter of the receiving port sealing surface 25a is smaller than the outer diameter of the outer sealing surface 12. Therefore, when the valve portion 11 is disposed in the valve portion accommodating portion 25, the outer sealing surface 12 is configured to be pressed against the receiving port sealing surface 25a by the elastic deformation of the valve portion 11.

[0065] The receiving port positioning surfaces 25b and 25c position the axial position of the valve portion 11 with respect to the receiving port 22 of the joined pipe 20. The receiving port positioning surface 25b is located at the end portion on the base end portion 23 side of the receiving port 22 in the receiving port sealing surface 25a. The receiving port positioning surface 25c is located at the end portion on the tip end portion 24 side of the receiving port 22 in the receiving port sealing surface 25a. The receiving port positioning surfaces 25b and 25c are tapered surfaces located radially inward as they go toward the axial end surfaces of the valve portion 11 in the receiving port sealing surface 25a. That is, the receiving port positioning surfaces 25b and 25c are protrusions protruding radially inward from the receiving port sealing surface 25a to the receiving port 22. The receiving port positioning surfaces 25b and 25c are configured such that the valve portion positioning surfaces 12a and 12b are pressed against them when the valve portion 11 is disposed in the valve portion accommodating portion 25. Thereby, the valve portion positioning surfaces 12a and 12b position the axial position of the valve portion 11 with respect to the receiving port 22 of the joined pipe 20.

[0066] The lock ring portion accommodating portion 26 is an annular recess recessed radially outward along the circumferential direction of the inner circumferential surface of the receiving port 22. The lock ring portion accommodating portion 26 is located on the base end portion 23 side (straight pipe portion 21 side) of the receiving port 22 rather than the valve portion accommodating portion 25. The lock ring portion accommodating portion 26 accommodates at least a part of the lock ring portion 14 of the valve portion 11. The lock ring portion accommodating portion 26 has a first receiving port engaging portion 26a and a second receiving port engaging portion 26b.

[0067] The first receiving port engaging portion 26a engages with the second locking portion 14b of the lock ring portion 14. The first receiving port engaging portion 26a is a wall surface located on the tip end portion 24 side of the receiving port 22 in the lock ring portion accommodating portion 26. The first receiving port engaging portion 26a is located radially outward of the receiving port 22 with respect to the receiving port water stop surface 25a of the valve portion accommodating portion 25.

[0068] The second receiving port engaging portion 26b engages with the third locking portion 14c of the lock ring portion 14. The second receiving port engaging portion 26b is a wall surface located on the base end portion 23 side of the receiving port 22 in the lock ring portion accommodating portion 26. The second receiving port engaging portion 26b is located radially outward of the receiving port 22 with respect to the receiving port water stop surface 25a of the valve portion accommodating portion 25.

[0069] The relief portion 27 is an annular recess that is recessed radially outward along the circumferential direction of the inner peripheral surface of the receiving port 22. The relief portion 27 is located on the base end portion 23 side (straight pipe portion 21 side) of the receiving port 22 with respect to the lock ring portion accommodating portion 26. The relief portion 27 accommodates at least a part of the lock ring portion 14 of the valve portion 11. Therefore, the lock ring portion 14 located within the relief portion 27 does not contact the inner peripheral surface of the receiving port 22. That is, the relief portion 27 constitutes a space in the receiving port 22 so that the lock ring portion 14 does not contact other portions of the receiving port 22 until it contacts the first receiving port engaging portion 26a or the second receiving port engaging portion 26b.

[0070] As shown in FIG. 1, the guide portion 28 is located on the base end portion 23 side (straight pipe portion 21 side) of the receiving port 22 with respect to the relief portion 27. The guide portion 28 is a tapered surface whose inner diameter increases as it goes toward the base end portion 23 side. The guide portion 28 guides the insertion port engaging portion 33 (see FIG. 1) of the pipe 30 located on the straight pipe portion 21 side with respect to the relief portion 27 to the lock ring portion 14 when the insertion port engaging portion 33 moves to the tip end portion 24 side of the receiving port 22. Thereby, the insertion port engaging portion 33 of the pipe 30 located on the straight pipe portion 21 side with respect to the lock ring portion accommodating portion 26 can contact the lock ring portion 14 smoothly.

[0071] (Arrangement of the sealing member) As shown in FIG. 5, the seal member 10 is disposed within the receiving port 22 of the pipe 20 to be joined. Specifically, the valve portion 11 of the seal member 10 is inserted into the valve portion housing portion 25. The valve portion 11 is disposed within the valve portion housing portion 25 with the locking ring portion 14 facing the base end portion 23 side (straight pipe portion 21 side) of the receiving port 22. The inner water stop surface 13 of the valve portion 11 is located radially inward of the valve portion 11 as it extends from the tip end portion 24 side to the base end portion 23 side of the receiving port 22. Thus, the insertion port 32 of the pipe 30 inserted from the tip end portion 24 side of the receiving port 22 contacts the inner water stop surface 13. The valve portion 11 is elastically deformed radially inward by the valve portion housing portion 25. The outer water stop surface 12 of the valve portion 11 is pressed against the receiving port water stop surface 25a of the valve portion housing portion 25 by the reaction force of the elastically deformed valve portion 11.

[0072] At least one of the locking ring portions 14 of the seal member 10 is accommodated within the locking ring portion housing portion 26. The locking ring portion 14 is disposed within the locking ring portion housing portion 26 with the first locking portion 14a facing the base end portion 23 side of the receiving port 22. The first locking portion 14a is located at the most base end portion 23 side and the most radially inward of the receiving port 22 in the locking ring portion 14. The second locking portion 14b is located at the most tip end portion 24 side and the most radially outward of the receiving port 22 in the locking ring portion 14. Also, the second locking portion 14b is located in the locking ring portion 14 so as to be closest and opposed to the first receiving port engaging portion 26a of the locking ring portion housing portion 26. The third locking portion 14c is located in the locking ring portion 14 so as to be closest and opposed to the second receiving port engaging portion 26b of the locking ring portion housing portion 26.

[0073] In a state where the lock ring portion 14 is accommodated in the lock ring portion accommodating portion 26, the first lock portion 14a is not in contact with the first receiving port engaging portion 26a. Similarly, the third lock portion 14c is not in contact with the second receiving port engaging portion 26b. Therefore, when the seal member 10 is disposed in the receiving port 22, by inserting the valve portion 11 into the valve portion accommodating portion 25, the lock ring portion 14 is positioned in the lock ring portion accommodating portion 26. Thus, even if the lock ring portion 14 is connected to the valve portion 11, the valve portion 11 and the lock ring portion 14 can be disposed in the receiving port 22 simply by inserting the valve portion 11 into the valve portion accommodating portion 25.

[0074] The insertion port 32 of the pipe 30 is located at one end portion of the pipe 30. The insertion port 32 is a cylindrical portion extending in the direction of the axis L2 from the straight pipe portion 31 of the pipe 30. The insertion port 32 has an insertion port water stop surface 32a on the outer peripheral surface of the tip portion.

[0075] The insertion port water stop surface 32a is a surface configured to exhibit a sealing property with the inner water stop surface 13 of the valve portion 11. The insertion port water stop surface 32a is located in a region where the valve portion 11 contacts on the outer peripheral surface of the insertion port 32. The receiving port water stop surface 25a is a cylindrical surface that can contact the inner water stop surface 13. The outer diameter of the insertion port water stop surface 32a is larger than the smallest inner diameter portion of the inner water stop surface 13. Therefore, when the insertion port 32 is inserted into the valve portion 11, the inner water stop surface 13 is configured to be pressed against the insertion port water stop surface 32a by the elastic deformation of the valve portion 11.

[0076] The insertion port engaging portion 33 protrudes radially outward from the outer peripheral surface of the insertion port 32. The outer diameter of the insertion port engaging portion 33 is larger than the smallest inner diameter of the lock ring portion 14. That is, the outer diameter of the insertion port engaging portion 33 is larger than the inner diameter of the first lock portion 14a of the lock ring portion 14.

[0077] The insertion port 32 of the pipe 30 is inserted into the receiving port 22 of the pipe to be joined 20. At this time, the first locking portion 14a of the locking ring portion 14 is in contact with the outer peripheral surface of the insertion port 32. When the insertion port 32 is inserted into the receiving port 22 of the pipe to be joined 20, the insertion port 32 is inserted until the insertion port engaging portion 33 passes over the valve portion 11 and the locking ring portion 14. Thereby, the insertion port 32 of the pipe 30 is joined to the receiving port 22 of the pipe to be joined 20.

[0078] The inner sealing surface 13 of the valve portion 11 into which the insertion port 32 of the pipe 30 is inserted is elastically deformed by the insertion port 32. The inner sealing surface 13 of the valve portion 11 is pressed against the insertion port sealing surface 32a of the insertion port 32 by the reaction force of the elastically deformed valve portion 11. The valve portion 11 seals between the inner peripheral surface of the receiving port 22 and the outer peripheral surface of the insertion port 32 by the outer sealing surface 12 that is in close contact with the receiving port sealing surface 25a of the receiving port 22 and the inner sealing surface 13 that is in close contact with the insertion port sealing surface 32a of the insertion port 32.

[0079] The pipe joint 1 configured in this way is movable with respect to the receiving port 22 of the pipe to be joined 20 in the direction from the tip end portion 24 side to the base end portion 23 side and from the base end portion 23 side to the tip end portion 24 side of the insertion port 32 of the pipe 30. The range from the tip end portion 24 to the guide portion 28 of the receiving port 22 is processed with a predetermined machining accuracy and has sufficient rigidity. By improving the machining accuracy and rigidity of the receiving port 22, the pipe joint 1 can join the pipe to be joined 20 and the pipe 30 without leakage of the fluid flowing through the pipe joint 1.

[0080] (Function of the locking ring portion) Using FIGS. 6 to 9, the function of the lock ring portion 14 when the insertion port 32 of the pipe 30 moves in the axial direction or the radial direction of the receiving port 22 in the pipe joint 1 will be described. FIG. 6 is an enlarged cross-sectional view showing a schematic configuration of the lock ring portion 14 when the insertion port 32 of the pipe 30 moves axially toward the base end portion 23 side of the receiving port 22 of the pipe to be joined 20 in the pipe joint 1. FIG. 7 is an enlarged cross-sectional view showing a schematic configuration of the lock ring portion 14 when the insertion port 32 of the pipe 30 moves in the radial direction of the receiving port 22 of the pipe to be joined 20 in the pipe joint 1. FIG. 8 is an enlarged cross-sectional view showing a schematic configuration of the lock ring portion 14 when the insertion port 32 of the pipe 30 moves toward the tip end portion 24 side of the receiving port 22 of the pipe to be joined 20 in the pipe joint 1. FIG. 9 is an enlarged cross-sectional view showing a schematic configuration of the lock ring portion 14 when the insertion port engaging portion 33 of the insertion port 32 of the pipe 30 contacts the lock ring portion 14 in the pipe joint 1.

[0081] (Axial movement of the insertion port toward the base end portion side of the receiving port) As shown in FIG. 6, when the insertion port 32 is moved axially toward the base end portion 23 side of the receiving port 22 (see the white arrow), a pushing force F1, which is an axial force toward the base end portion 23, is applied to the valve portion 11 due to the friction between the insertion port 32 and the inner water stop surface 13. When the valve portion 11 is moved axially from the valve portion housing portion 25 toward the base end portion 23 side of the receiving port 22 (the straight pipe portion 21 side of the pipe to be joined 20) by the pushing force F1, the lock ring portion 14 connected to the valve portion 11 is moved axially toward the base end portion 23 side of the receiving port 22 along with the movement of the valve portion 11.

[0082] When the axial movement amount of the valve portion 11 toward the base end portion 23 side of the receiving port 22 becomes equal to or greater than the axial gap between the third locking portion 14c of the lock ring portion 14 and the second receiving port engaging portion 26b of the lock ring portion housing portion 26, the third locking portion 14c engages with the second receiving port engaging portion 26b (see arrow A1). The second receiving port engaging portion 26b holds the axial position of the third locking portion 14c. That is, when a pushing force F1 is applied to the valve portion 11, the second receiving port engaging portion 26b restricts the axial movement of the valve portion 11 toward the base end portion 23 side. Thereby, it is possible to prevent the valve portion 11 from protruding from the valve portion housing portion 25.

[0083] (Radial movement of the insertion port) As shown in FIG. 7, when the insertion port 32 moves in the radial direction of the receiving port 22, the lock ring portion 14 in contact with the outer peripheral surface of the insertion port 32 is moved in the radial direction of the receiving port 22 as the insertion port 32 moves.

[0084] When the movement amount of the insertion port 32 in the radial direction of the receiving port 22 becomes equal to or greater than the radial gap of the receiving port 22 between the third locking portion 14c of the lock ring portion 14 and the second receiving port engaging portion 26b of the lock ring portion housing portion 26, the third locking portion 14c engages with the second receiving port engaging portion 26b (see arrow A2). The second receiving port engaging portion 26b holds the radial position of the third locking portion 14c. That is, when the insertion port 32 moves in the radial direction, the second receiving port engaging portion 26b restricts the radial movement that is equal to or greater than the gap between the second receiving port engaging portion 26b and the third locking portion 14c. Thereby, the eccentricity of the insertion port 32 with respect to the receiving port 22 can be suppressed within an allowable range.

[0085] (Axial movement of the insertion port toward the tip end side) As shown in Fig. 8, when the insertion port 32 is axially moved toward the tip 24 side of the receiving port 22 (see the white arrow), an axial pulling force F2 from the base end 23 to the tip 24 of the receiving port 22 is applied to the valve part 11 due to the friction between the insertion port 32 and the inner water stop surface 13. When the valve part 11 is axially moved from the valve part housing part 25 toward the tip 24 side of the receiving port 22 by the pulling force F2, that is, when the valve part 11 is moved in the direction of coming out of the receiving port 22 of the pipe 20 to be joined, the locking ring part 14 connected to the valve part 11 is axially moved toward the tip 24 side of the receiving port 22 along with the movement of the valve part 11.

[0086] When the axial movement amount of the valve part 11 toward the tip 24 side of the receiving port 22 becomes equal to or more than the axial gap between the second locking part 14b of the locking ring part 14 and the first receiving port engaging part 26a of the locking ring part housing part 26, the second locking part 14b engages with the first receiving port engaging part 26a (see arrow A3). That is, the first receiving port engaging part 26a restricts the axial movement of the valve part 11 toward the tip 24 side when the pulling force F2 is applied to the valve part 11. Thereby, it is possible to prevent the valve part 11 from coming out of the valve part housing part 25.

[0087] (Prevention of detachment of the insertion port) As shown in Fig. 9, when the insertion port 32 is axially moved toward the tip 24 side of the receiving port 22, that is, when the insertion port 32 is moved in the direction of coming out of the receiving port 22 of the pipe 20 to be joined (see the white arrow), the insertion port engaging part 33 contacts the first locking part 14a of the locking ring part 14. The locking ring part 14 contacted by the insertion port engaging part 33 is axially moved toward the tip 24 side of the receiving port 22 along with the movement of the insertion port 32.

[0088] When the axial movement amount of the lock ring portion 14 toward the tip portion 24 side of the receiving port 22 is equal to or greater than the axial gap between the second lock portion 14b of the lock ring portion 14 and the first receiving port engaging portion 26a of the lock ring portion housing portion 26, the second lock portion 14b engages with the first receiving port engaging portion 26a (see arrow A4). That is, the first receiving port engaging portion 26a restricts the axial movement toward the tip portion 24 side of the insertion port 32 after the insertion port engaging portion 33 contacts the first lock portion 14a. Thereby, it is possible to prevent the insertion port 32 from detaching from the receiving port 22.

[0089] The pipe joint 1 according to the present embodiment includes an insertion port 32 of a pipe 30, a receiving port 22 of a joined pipe 20 into which the insertion port 32 of the pipe 30 is inserted, and a seal member 10 that seals between the outer peripheral surface of the insertion port 32 of the pipe 30 and the inner peripheral surface of the receiving port 22 of the joined pipe 20. The seal member 10 has an annular valve portion 11 whose outer peripheral surface is pressed against the inner peripheral surface of the receiving port 22 of the joined pipe 20 and whose inner peripheral surface is pressed against the outer peripheral surface of the insertion port 32 of the pipe 30, and a lock ring portion 14 that has flexibility lower than that of the valve portion 11 and is connected to the straight pipe portion 21 side in the axial direction of the joined pipe 20 with respect to the valve portion 11. The pipe 30 has an insertion port engaging portion 33 on the outer peripheral surface of the insertion port 32 that can engage with the lock ring portion 14. The joined pipe 20 has a first receiving port engaging portion 26a on the inner peripheral surface of the receiving port 22 that can engage with the lock ring portion 14. The lock ring portion 14 engages with the first receiving port engaging portion 26a when the valve portion 11 moves toward the tip portion 24 side of the receiving port 22 of the joined pipe 20, that is, when it moves in the direction of coming out of the receiving port 22. Further, the lock ring portion 14 engages with the first receiving port engaging portion 26a and the insertion port engaging portion 33 when the insertion port 32 of the pipe 30 moves in the direction of detaching from the receiving port 22 of the joined pipe 20, that is, when it moves in the direction of coming out of the receiving port 22.

[0090] In the above configuration, a lock ring portion 14 is connected to a valve portion 11 that seals between the inner peripheral surface of the receiving port 22 of the pipe 20 to be joined and the outer peripheral surface of the insertion port 32 of the pipe 30. The lock ring portion 14 is configured to be engageable with a first receiving port engaging portion 26a of the pipe 20 to be joined and an insertion port engaging portion 33 of the pipe 30. By being connected to the valve portion 11, the lock ring portion 14 can restrict not only the axial movement of the insertion port 32 of the pipe 30 but also the axial movement of the valve member 11.

[0091] In the pipe joint 1 having the above configuration, the lock ring portion 14 prevents the valve portion 11 from coming out of the receiving port 22 of the pipe 20 to be joined and the insertion port 32 of the pipe 30 from coming out. Further, the pipe joint 1 does not require a lock ring to be incorporated separately from the sealing member 10 in the receiving port 22 of the pipe 20 to be joined. Thereby, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe 20 to be joined can be efficiently performed. Further, the pipe joint 1 has a shorter axial distance between the valve portion 11 and the lock ring portion 14 than a conventional pipe joint in which a rubber ring and a lock ring are individually inserted into the receiving port. Therefore, the pipe joint 1 can increase the range of inclination of the axis L2 of the insertion port 32 of the pipe 30 with respect to the axis L1 of the receiving port 22 of the pipe 20 to be joined, such that the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe 20 to be joined can be joined, compared to a conventional pipe joint.

[0092] Therefore, a pipe joint 1 can be realized that can efficiently perform the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe 20 to be joined.

[0093] Also, in the present embodiment, the lock ring portion 14 has a first lock portion 14a located on the straight pipe portion 21 side of the pipe 20 to be joined, and a second lock portion 14b located on the tip end portion 24 side of the receiving port 22 of the pipe 20 to be joined and radially outward of the first lock portion 14a. The first lock portion 14a engages with the insertion port engaging portion 33 when the insertion port 32 of the pipe 30 moves in a direction in which it comes out of the receiving port 22 of the pipe 20 to be joined. The second lock portion 14b engages with the first receiving port engaging portion 26a when the valve portion 11 moves in a direction in which it comes out of the receiving port 22 of the pipe 20 to be joined and when the insertion port 32 of the pipe 30 moves in a direction in which it comes out of the receiving port 22 of the pipe 20 to be joined.

[0094] The lock ring portion 14 prevents the valve portion 11 from coming out of the receiving port 22 of the joined pipe 20 and the insertion port 32 of the pipe 30 from coming out by the second lock portion 14b, and also prevents the insertion port 32 of the pipe 30 from coming out by the first lock portion 14a. Therefore, the lock ring portion 14 prevents the valve portion 11 from coming out of the receiving port 22 of the joined pipe 20 and the insertion port 32 of the pipe 30 from coming out. Thereby, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the joined pipe 20 can be efficiently performed.

[0095] Further, in the present embodiment, the receiving port 22 of the joined pipe 20 has a second receiving port engaging portion 26b on the inner peripheral surface on the straight pipe portion 21 side in the axial direction rather than the first receiving port engaging portion 26a. The lock ring portion 14 has a third lock portion 14c located between the first lock portion 14a and the second lock portion 14b. The third lock portion 14c engages with the second receiving port engaging portion 26b when the valve portion 11 moves to the straight pipe portion 21 side of the joined pipe 20.

[0096] In the above configuration, when joining the insertion port 32 of the pipe 30 and the receiving port 22 of the joined pipe 20, the valve portion 11 seals between the inner peripheral surface of the receiving port 22 of the joined pipe 20 and the outer peripheral surface of the insertion port 32 of the pipe 30, and the lock ring portion 14 holds the axial position of the valve portion 11 located on the inner peripheral surface of the receiving port 22 of the joined pipe 20. Therefore, when inserting the insertion port 32 of the pipe 30 into the valve portion 11, the engagement between the third lock portion 14c and the second receiving port engaging portion 26b prevents the valve portion 11 from being displaced with respect to the receiving port 22 of the joined pipe 20. Further, when the insertion port 32 moves in the radial direction of the receiving port 22 by more than the gap between the third lock portion 14c and the second receiving port engaging portion 26b, the third lock portion 14c and the second receiving port engaging portion 26b engage. Therefore, the movement of the insertion port 32 in the radial direction is suppressed beyond the range where the receiving port 22 and the insertion port 32 can be appropriately joined. Thereby, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the joined pipe 20 can be efficiently performed.

[0097] In addition, in the present embodiment, the seal member 10 has flexibility and further has a connecting portion 15 that connects the valve portion 11 and the lock ring portion 14.

[0098] Thereby, the lock ring portion 14 can adjust the position with respect to the valve portion 11 held in the receiving port 22 of the pipe to be joined 20 due to the elastic deformation of the connecting portion 15. Therefore, it is easy to arrange the valve portion 11 and the lock ring portion 14 in the receiving port 22 of the pipe to be joined 20. Also, it is easy to insert the insertion port 32 of the pipe 30 into the valve portion 11. Thereby, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe to be joined 20 can be performed efficiently.

[0099] In addition, in the present embodiment, the lock ring portion 14 is constituted by an arcuate plate-like member when viewed in the axial direction. It is located radially outward of the valve portion 11 from the first lock portion 14a toward the second lock portion 14b. The first lock portion 14a is located radially inward of the outer peripheral surface of the valve portion 11 and radially outward of the inner peripheral surface of the valve portion 11. The second lock portion 14b is located radially outward of the valve portion 11 from the outer peripheral surface of the valve portion 11.

[0100] Thereby, since the first lock portion 14a that is axially farther from the valve portion 11 than the second lock portion 14b is located radially inward of the second lock portion 14b, it is easy to insert the seal member 10 into the receiving port 22 of the pipe to be joined 20. Also, the second lock portion 14b engages with the first receiving port engaging portion 26a of the pipe to be joined 20, and the first lock portion 14a engages with the insertion port engaging portion 33 of the insertion port 32 of the pipe 30. Therefore, detachment between the pipe 30 and the pipe to be joined 20 is prevented without incorporating a lock ring, and displacement and extraction of the valve portion 11 are prevented. Thereby, the joining operation between the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe to be joined 20 can be performed efficiently.

[0101] (Other embodiments) The embodiments of the present invention have been described above. However, the above-described embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be appropriately modified and implemented without departing from the spirit thereof.

[0102] In the above embodiment, the pipe joint 1 joins the insertion port 32 of the pipe 30 and the receiving port 22 of the pipe to be joined 20 such that the axis L2 of the insertion port 32 of the pipe 30 coincides with the axis L1 of the receiving port 22 of the pipe to be joined 20. However, the pipe joint may join the insertion port of the pipe and the receiving port of the pipe to be joined such that the axis of the insertion port of the pipe intersects the axis of the receiving port of the pipe to be joined. That is, the pipe joint 1 may join the pipe and the pipe to be joined in a bent state.

[0103] In the above embodiment, the pipe joint 1 inserts the insertion port 32 of the pipe 30 into the receiving port 22 of the pipe to be joined 20. However, the pipe joint may move the receiving port of the pipe to be joined with respect to the insertion port of the pipe.

[0104] In the above embodiment, the lock ring portion 14 is configured in an arc shape in which a part of the annular member is cut. However, the lock ring portion may have any shape as long as the insertion port of the pipe can be inserted. The lock ring portion may be, for example, annular. The lock ring portion may be composed of, for example, a plurality of arc-shaped members in which the annular member is cut at a plurality of locations.

[0105] In the above embodiment, the first receiving port engaging portion 26a and the second receiving port engaging portion 26b with which the lock ring portion 14 engages are the wall surfaces constituting the lock ring portion housing portion 26. However, the first receiving port engaging portion and the second receiving port engaging portion do not have to be parts constituting the lock ring portion housing portion. Also, the first receiving port engaging portion and the second receiving port engaging portion may have any shape as long as the lock ring portion can engage therewith.

[0106] In the above-described embodiment, when no force is applied from the insertion port 32 of the pipe 30, the second locking portion 14b and the third locking portion 14c of the lock ring portion 14 do not contact the lock ring portion housing portion 26. However, at least one of the second locking portion and the third locking portion of the lock ring portion may be brought into contact with the lock ring portion housing portion when no force is applied from the insertion port of the pipe.

Industrial Applicability

[0107] The present invention can be used for a pipe joint and a sealing member having an insertion port of a pipe, a receiving port of a pipe to be joined into which the insertion port of the pipe is inserted, and a sealing member that seals between the outer peripheral surface of the insertion port of the pipe and the inner peripheral surface of the receiving port of the pipe to be joined.

Explanation of Signs

[0108] 1 Pipe joint 10 Sealing member 11 Valve portion 12 Outer water stop surface 12a, 12b Valve portion positioning surface 13 Inner water stop surface 14 Lock ring portion 14a First locking portion 14b Second locking portion 14c Third locking portion 20 Pipe to be joined 21 Straight pipe portion of the pipe to be joined 22 Receiving port 23 Base end portion 24 Tip end portion 25 Valve portion housing portion 25a Receiving port water stop surface 25b, 25c Receiving port positioning surface 26 Lock ring portion housing portion 26a First receiving port engaging portion 26b Second receiving port engaging portion 27 Relief portion 28 Guide 29 Buffer space 30 Pipe 31 Straight pipe portion of the pipe 32 Insertion port 32a Insertion port water stop surface 33 Insertion port engagement part 33a Insertion port inclined surface 33b Lock ring contact surface F1 Pushing force F2 Pulling force A1, A2, A3, A4 Arrows L1, L2 Axes

Claims

1. A pipe joint having an insertion port of a pipe, a receiving port of a pipe to be joined into which the insertion port of the pipe is inserted, and a sealing member that seals between an outer peripheral surface of the insertion port of the pipe and an inner peripheral surface of the receiving port of the pipe to be joined, wherein the sealing member, has an annular valve portion whose outer peripheral surface is pressed against the inner peripheral surface of the receiving port of the pipe to be joined and whose inner peripheral surface is pressed against the outer peripheral surface of the insertion port of the pipe, has a locking ring portion that has a lower flexibility than the valve portion and is connected to the valve portion on the straight pipe portion side in the axial direction of the pipe to be joined, the pipe has an insertion port engaging portion on the outer peripheral surface of the insertion port that can engage with the locking ring portion, the pipe to be joined has a first receiving port engaging portion on the inner peripheral surface of the receiving port that can engage with the locking ring portion, the locking ring portion, engages with the first receiving port engaging portion when the valve portion moves in a direction of coming out of the receiving port of the pipe to be joined, and engages with the first receiving port engaging portion and the insertion port engaging portion when the insertion port of the pipe moves in a direction of coming out of the receiving port of the pipe to be joined, a pipe joint.

2. In the pipe joint according to Claim 1, the locking ring portion, has a first locking portion located on the straight pipe portion side of the pipe to be joined, and a second locking portion located on the receiving port side of the pipe to be joined and radially outward of the first locking portion, the first locking portion, engages with the insertion port engaging portion when the insertion port of the pipe moves in a direction of coming out of the receiving port of the pipe to be joined, the second locking portion, engages with the first receiving port engaging portion when the valve portion moves in a direction of coming out of the receiving port of the pipe to be joined and when the insertion port of the pipe moves in a direction of coming out of the receiving port of the pipe to be joined, a pipe joint.

3. In the pipe joint according to Claim 2, the receiving port of the pipe to be joined, has a second receiving port engaging portion on the inner peripheral surface on the straight pipe portion side in the axial direction of the first receiving port engaging portion, the locking ring portion, has a third locking portion located between the first locking portion and the second locking portion, the third locking portion, engages with the second receiving port engaging portion when the valve portion moves to the straight pipe portion side of the pipe to be joined, a pipe joint.

4. In the pipe joint according to Claim 1, the sealing member, has flexibility and further has a connecting portion that connects the valve portion and the locking ring portion, a pipe joint.

5. In the pipe joint according to Claim 2, the locking ring portion, is constituted by an arcuate plate-like member when viewed in the axial direction, It is located radially outward of the valve portion as it goes from the first locking portion toward the second locking portion, The first locking portion is located radially inward of the outer peripheral surface of the valve portion and radially outward of the inner peripheral surface of the valve portion, The second locking portion is located radially outward of the valve portion with respect to the outer peripheral surface of the valve portion, Pipe joint.

6. A sealing member that seals between the outer peripheral surface of the insertion port of the pipe and the inner peripheral surface of the receiving port of the joined pipe into which the insertion port of the pipe is inserted, An annular valve portion having a sealing property, It has a lower flexibility than the valve portion and a lock ring portion that prevents the insertion port of the pipe joined to the receiving port of the joined pipe from detaching from the receiving port, The lock ring portion is Connected to the valve portion in the axial direction of the valve portion, Sealing member.

7. In the sealing member according to claim 6, It has flexibility and further has a connecting portion that connects the valve portion and the lock ring portion, Sealing member.

8. In the sealing member according to claim 6, The lock ring portion is Composed of an arcuate plate-like member when viewed in the axial direction, It has a first locking portion and a second locking portion located closer to the valve portion side than the first locking portion. It is located radially outward of the valve portion as it goes from the first locking portion toward the second locking portion, The first locking portion is Located radially inward of the outer peripheral surface of the valve portion and radially outward of the inner peripheral surface of the valve portion. The second locking portion is Located radially outward of the outer peripheral surface of the valve portion, Sealing member.

9. In the sealing member according to claim 8, The lock ring portion is It has a third locking portion located between the first locking portion and the second locking portion, Sealing member.

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