JP4832866B2 - Piping joint and piping connection structure - Google Patents

Description

  The present invention relates to a pipe joint and pipe connection structure provided in an analysis apparatus, an experimental apparatus, a manufacturing apparatus, and the like.

In an apparatus (for example, an analysis apparatus, an experimental apparatus, a manufacturing apparatus, or the like) provided with a pipe through which a fluid such as gas flows, pipes having the same outer diameter or pipes having different outer diameters may be connected. When connecting pipes, a pipe joint is generally used.
As a conventional pipe joint, for example, a male screw is provided at both ends, a pipe insertion hole formed from the tip of the male screw to the inside, and a through hole formed to communicate the pipe insertion holes at both ends. (For example, refer to Patent Documents 1 and 2). In pipe connection using such a pipe joint, a cap nut screwed into the male thread of the pipe joint and having a bottom portion opened for pipe penetration and a pipe insertion hole through which the pipe is inserted are formed. A ferrule inserted into the pipe insertion hole of the joint is used. Specifically, after sequentially passing a cap nut and ferrule through the pipe, the tip of the pipe is inserted into the pipe insertion hole of the pipe joint, and the cap nut is screwed into the male thread of the pipe joint. When the cap nut is screwed onto the male thread of the pipe joint, the ferrule is fixed to the pipe while being in close contact with the pipe insertion hole of the pipe joint, so that the pipe can be fixed to the pipe joint while ensuring airtightness. In this way, two pipes are fixed to a pipe joint and the pipes are connected to each other.
Japanese Utility Model Publication No. 62-52391 JP-A-4-39491

However, in the conventional pipe joint, high airtightness can be ensured, but on the other hand, screwing is required when fixing the pipe, so that the pipe connection work is not simple. Moreover, since the conventional pipe joint has a complicated structure, it is expensive. When this pipe joint is provided, the cost of the apparatus is high. In particular, when the pipe joint is used in an apparatus that does not require high airtightness, waste is increased in terms of cost.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe joint and a pipe connection structure that can easily connect two pipes and are inexpensive.

The present invention includes the following configurations.
(1) In a pipe joint that connects two pipes with different outer diameters,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body has a large-diameter pipe insertion hole into which a large-diameter pipe that has a larger outer diameter is inserted, a small-diameter pipe insertion hole into which a small-diameter pipe that has a smaller outer diameter is inserted, and a large-diameter pipe. The end of the pipe insertion hole and the end of the small diameter pipe insertion hole communicate with each other, and a through hole having a diameter substantially equal to the inner diameter of the large diameter pipe is formed.
The relay pipe has an entire outer diameter substantially equal to the diameter of the through hole of the joint body and the inner diameter of the large diameter pipe , and the entire inner diameter is substantially equal to the outer diameter of the small diameter pipe. Arranged in the range from the hole to the end side in the large-diameter pipe insertion hole ,
A pipe joint characterized in that a small-diameter pipe is inserted into one end of a relay pipe and the other end of the relay pipe is inserted into a large-diameter pipe .
(2) In a pipe joint that connects two pipes with the same outer diameter,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body is formed with two pipe insertion holes into which the respective pipes are inserted, and through holes having a diameter substantially equal to the inner diameter of the pipes, communicating with the terminal ends of the respective pipe insertion holes.
Relay tube outer径全body is substantially equal to the diameter and the inner diameter of the pipe of the through hole of the joint body, arranged from the through hole of the joint body to a range to the end side in each pipe insertion hole It is,
A pipe joint characterized in that one end of a relay pipe is inserted into one pipe and the other end of the relay pipe is inserted into the other pipe.
(3) In a pipe joint that connects two pipes with the same outer diameter,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body is formed with two pipe insertion holes into which the pipes are inserted, and through holes having a diameter larger than the outer diameter of the pipes, communicating the terminal ends of the pipe insertion holes.
Relay tube outer径全body is equal to approximately the diameter of the through hole of the joint body, and the entire inner diameter is substantially equal to the outer diameter of the pipe, is disposed in the through hole of the joint body ,
A pipe joint characterized in that one pipe is inserted into one end of a relay pipe and the other pipe is inserted into the other end of the relay pipe.
(4) The pipe joint according to any one of (1) to (3), wherein the relay pipe is made of a fluororesin.
(5) The pipe joint according to any one of (1) to (4), wherein the joint body is made of silicone rubber.
(6) A pipe connection structure, wherein two pipes are connected by the pipe joint according to any one of (1) to (5) .

  The pipe joint or pipe connection structure of the present invention can easily connect two pipes and is inexpensive.

(First embodiment)
A first embodiment of a pipe joint and pipe connection structure of the present invention will be described.
FIG. 1 shows a pipe joint of the present embodiment. The pipe joint 1 of the present embodiment connects two pipes having different outer diameters (hereinafter, a pipe having a larger outer diameter is referred to as a large diameter pipe, and a pipe having a smaller outer diameter is referred to as a small diameter pipe). And a cylindrical joint body 10a made of an elastic polymer material and a relay pipe 20a. In addition, piping is made to flow the fluid which consists of gas or a liquid inside.

Joint body 10a is provided with a large diameter pipe insertion hole 11 with large diameter pipe T ₁ is inserted, a small diameter pipe insertion hole 12 diameter pipe T ₂ is inserted, the large-diameter pipe insertion hole 11 terminating with a small-diameter pipe insertion hole A through hole 13 communicating with the end of 12 is formed.
In joint body 10a in the present embodiment, the diameter of the large diameter pipe insertion hole 11 is substantially equal to the outer diameter of the large diameter pipe T _1, the diameter of the small diameter pipe insertion hole 12, the outer diameter of the small diameter pipe T ₂ is substantially equal to, the diameter of the through-hole 13 is substantially equal to the inner diameter of the large diameter pipe T ₁ (see FIG. 2).

  Moreover, the joint main body 10a in this embodiment consists of two members which shape | molded the elastic polymer material. That is, the large-diameter pipe insertion member 11 (see FIG. 3) in which the large-diameter pipe insertion hole 11 and the hole 14a constituting a part of the through hole 13 of the joint main body 10a are formed, the small-diameter pipe insertion hole 12 and the joint main body. The small-diameter pipe insertion member B (see FIG. 4) in which a hole 14b constituting a part of the through hole 13 of 10a is formed is integrated.

Examples of the elastic polymer material constituting the joint body 10a include polyolefin-based elastomers such as silicone rubber, fluoro rubber, and ethylene-propylene copolymer. Among these, translucent, because it can be visually recognized insertion state of the large diameter pipe T ₁ and a small-diameter pipe T _2, silicone rubber is preferred.
In this embodiment, since the relay pipe 20a is provided and no fluid contacts the joint body 10a, it is necessary to consider gas resistance or liquid resistance, impurities in the elastic polymer material, and the like. Absent.

Relay pipe 20a has an outer diameter bore and a large diameter pipe T ₁ inside diameter substantially equal to the through-hole 13 of the joint body 10a, and having an outer diameter substantially equal to the inner diameter of the small-diameter pipe T ₂ (See FIG. 5). Further, the relay pipe 20a is disposed in a range from the inside of the through hole 13 of the joint body 10a to the end side in the large diameter pipe insertion hole 11.

  The material of the relay pipe 20a is not particularly limited, but is preferably a resin because it can be obtained by simple processing. Furthermore, since the fluid flows also in the relay pipe 20a, one having high corrosion resistance is preferable, and specifically, a fluororesin is preferable. Examples of the fluororesin include polytetrafluoroethylene (PTFE) and tetrafluoroethylene-fluoroalkyl vinyl ether copolymer (PFA). In addition, the fluororesin has an advantage that it has few impurities and is excellent in contamination resistance of the fluid flowing in the relay pipe 20a.

The material of the large-diameter pipe T ₁ and the small-diameter pipe T ₂ is not particularly limited, but a fluid flowing through each pipe may be corrosive, so that it is preferably a corrosion-resistant material. Examples of the corrosion resistant material include fluororesin, stainless steel, and glass. Among these, a fluororesin is preferable because of excellent contamination resistance.
Furthermore, if the material of the large-diameter pipe T ₁ and the small-diameter pipe T _{2 and} the material of the relay pipe 20a are both fluororesins, the contamination of the fluid can be further prevented and the contamination resistance is excellent.

In the pipe connection structure using this pipe joint 1, as shown in FIG. 6, the through hole 13 of the joint body 10 a formed by integrating the large diameter pipe insertion member A and the small diameter pipe insertion member B. relay pipe 20a is disposed within the large diameter pipe T ₁ is inserted into the large diameter pipe insertion hole 11 of the fitting body 10a, further relay tube 20a to the end of the large diameter pipe T ₁ is inserted . Further, the small diameter pipe T ₂ is inserted into the small-diameter pipe insertion hole 12 of the fitting body 10a, further the end of the small diameter pipe T ₂ is inserted in the relay pipe 20a. In this manner, a large diameter pipe T ₁ and the small-diameter pipe T ₂ are connected by the relay pipe 20a.

As a procedure for forming the pipe connection structure, for example, the following procedures (a) and (b) can be adopted, but the procedure is not limited thereto.
(A) One end of the relay pipe 20a is inserted into the hole 14a of the large-diameter pipe insertion member A, and the other end of the relay pipe 20a is inserted into the hole 14b of the small-diameter pipe insertion member B. A joint 1 is formed. Then, insert the large diameter pipe T ₁ to the large diameter pipe insertion hole 11 of the pipe fitting 1, further inserting the relay pipe 20a inserted into the large diameter pipe T _1. Moreover, by inserting a small diameter tubing _{T 2} to the small diameter pipe insertion hole 12 of the fitting body 10a, further, inserting the small diameter tubing _{T 2} in the relay pipe 20a.
(B) while inserting one end of the relay pipe 20a to the small-diameter piping insertion member B of the hole 14b, inserting the small diameter tubing T ₂ to the small diameter pipe insertion hole 12 of the small diameter pipe insertion member B, the relay pipe 20a inserting the small diameter tubing T ₂ within. Then, insert the other end of the relay pipe 20a to the small-diameter piping insertion member B of the holes 14b, then, while inserting a large diameter pipe T ₁ to the large diameter pipe insertion hole 11, the inserted large-diameter pipe T ₁ Insert the other end of the relay pipe 20a.

In the pipe joint 1 described above, the diameter of the large-diameter pipe insertion hole 11 is substantially the same as the outer diameter of the large-diameter pipe T ₁ , so the large-diameter pipe T ₁ is inserted into the large-diameter pipe insertion hole 11 while closely contacting. since the diameter of the small diameter pipe insertion hole 12 is equal to approximately the outer diameter of the small diameter pipe T _2, the small-diameter pipe T ₂ to the small diameter pipe insertion hole 12 is inserted with close contact. Here, the frictional force from the joint body 10a is made of elastic polymeric material, and the joint body 10a and the large-diameter pipe T ₁ and the small-diameter pipe T ₂ of the large diameter pipe T ₁ and the small-diameter pipe T ₂ is inserted ( Adhesion strength) is large. Therefore, when the fluid is depressurized flow was during or large diameter pipe T ₁ and a small-diameter pipe T in ₂ for large diameter pipe T ₁ and a small-diameter pipe T _2, can secure sufficient airtightness, yet sufficient connection Strength can be given.
Moreover, since elastic polymer material constituting a joint body 10a is impure and this fluid contacts, there is a risk of contaminating the fluid, in the pipe joint 1, the large diameter pipe T ₁ and the small diameter pipe T ₂ is connected by the relay pipe 20a, the fluid does not touch the joint body 10a, and is excellent in contamination resistance.

Further, since the joint body 10a made of an elastic polymer material is easily deformed, in this pipe joint 1, the relay pipe 20a can be easily inserted into the through hole 13, and the pipe can be inserted into the large-diameter pipe insertion hole 11, It can be easily inserted into the small diameter pipe insertion hole 12. Accordingly, screwing work is unnecessary, it is possible outer diameter conveniently connect different large diameter pipe T ₁ and a small-diameter pipe T ₂ together.
Further, since the joint body 10a and the relay pipe 20a of the pipe joint 1 described above are not formed with screws and have a simple structure, they can be obtained by a simple molding process and are inexpensive. Therefore, the pipe joint 1 including these is also inexpensive.

  When the pipe joint 1 described above is used, the pressure of the fluid flowing in the pipe joint 1 is preferably −70 to +50 kPa as a gauge pressure, and more preferably −50 to +10 kPa. When the pressure of the fluid is less than -70 kPa as the gauge pressure, outside air may be mixed into the fluid at the pipe joint 1, and when it exceeds +50 kPa as the gauge pressure, the fluid may leak out from the pipe joint 1.

(Second Embodiment)
A second embodiment of the pipe joint and pipe connection structure of the present invention will be described.
FIG. 7 shows the pipe joint of this embodiment. The pipe joint 2 of the present embodiment connects two pipes having the same outer diameter and includes a cylindrical joint body 10b made of an elastic polymer material and a relay pipe 20b. is there.
In addition, piping connected with the piping joint 2 of this embodiment is the large diameter piping T1 in _1st Embodiment.

Fitting body 10b includes two large diameter pipe insertion hole 11 a large diameter pipe T ₁ of the two is inserted, communicates the termination of the respective large-diameter pipe insertion hole 11, the large-diameter pipe T ₁ inside diameter substantially A through hole 13 having the same diameter is formed (see FIG. 8).
The joint body 10b in this embodiment uses two large-diameter pipe insertion members A in the first embodiment, and specifically, the holes 14a of the large-diameter pipe insertion member A are connected to each other. The two large-diameter pipe insertion members A are integrated so that the through hole 13 is formed.

Relay tube 20b are those having an outer diameter bore and a large diameter pipe T ₁ inside diameter substantially equal to the through-hole 13 of the joint body 10b (see FIG. 9). Further, the relay pipe 20b is disposed in a range from the inside of the through hole 13 of the joint body 10b to the terminal end side in each large diameter pipe insertion hole 11.
The material of the relay pipe 20b is the same as that in the first embodiment.

In the pipe connection structure using the pipe joint 2, as shown in FIG. 10, the relay pipe 20b is inserted into the through hole 13 of the joint body 10b formed by integrating the two large-diameter pipe insertion members A. Are arranged, large-diameter pipes T ₁ and T ₁ are respectively inserted into the large-diameter pipe insertion holes 11 and 11 of the joint body 10b, and a relay pipe 20b is inserted at the end of the large-diameter pipes T ₁ and T _1. Has been. In this way, the large-diameter pipes T ₁ and T ₁ are connected to each other by the relay pipe 20b.

As a procedure for forming the pipe connection structure, for example, the following procedures (c) and (d) can be adopted, but the procedure is not limited thereto.
(C) In order to form the pipe connection structure, for example, one end of the relay pipe 20b is inserted into the hole 14a of one large-diameter pipe insertion member A and the other large-diameter pipe insertion member. The other end of the relay pipe 20b is inserted into the A hole 14a to form the pipe joint 2. Then, each insert a large diameter pipe T ₁ to the respective large diameter pipe insertion hole 11 of the pipe joint 2, further inserting the relay tube 20b inserted into the large diameter pipe T _1.
(D) Each of the large-diameter pipe insertion holes 11 of each large-diameter pipe insertion member A is inserted into the large-diameter pipe T1, and _one end of the relay pipe 20b is inserted into the hole 14a of one large-diameter pipe insertion member A. inserted, is further inserted into the large diameter pipe T _1. Then, insert the other end of the relay tube 20b in the hole 14a of the other large diameter pipe insertion member A, further inserting the large-diameter pipe T _1.

In the piping joint 2 described above, since the diameter of the large-diameter pipe insertion hole 11 is substantially equal to the outer diameter of the large diameter pipe T _1, large diameter pipe T ₁ is inserted while in close contact with the large-diameter pipe insertion hole 11 ing. Here, since the joint body 10b a large diameter pipe T ₁ is inserted is made of elastic polymeric material, the friction force between the large diameter pipe T ₁ and the fitting body 10b (adhesion) is large. Accordingly, a large diameter pipe T ₁ when the fluid is depressurized when the flow or a large diameter pipe T ₁ can secure sufficient airtightness, yet can have a sufficient connection strength.
Further, since the joint body 10b made of an elastic polymer material is easily deformed, the large-diameter pipes T ₁ and T ₁ can be easily connected to each other according to the pipe joint 2 as in the first embodiment. it can. Furthermore, the pipe joint 2 described above is inexpensive for the same reason as in the first embodiment.

(Third embodiment)
A third embodiment of the pipe joint and pipe connection structure of the present invention will be described.
FIG. 11 shows the pipe joint of this embodiment. The pipe joint 3 of the present embodiment connects two pipes having the same outer diameter, and includes a cylindrical joint body 10c made of an elastic polymer material and a relay pipe 20c. is there.
Note that pipe connected by a pipe joint 3 of the present embodiment is a small-diameter pipe T ₂ in the first embodiment.

Fitting body 10c includes two small-diameter pipe insertion hole 12 diameter pipe T ₂ of the two is inserted, it communicates the termination of the respective small-diameter pipe insertion hole 12, the larger diameter than the outer diameter of the small diameter pipe T ₂ A through hole 13 is formed (see FIG. 12).
The joint body 10c in the present embodiment uses two small-diameter pipe insertion members B in the first embodiment. Specifically, the holes 14b of the small-diameter pipe insertion member B are connected to each other and penetrated. Two small-diameter pipe insertion members B are integrated so that the holes 13 are formed.

Relay pipe 20c has an outer diameter bore and substantially equal to the through-hole 13 of the fitting body 10c, and those having an outer diameter substantially equal to the inner diameter of the small-diameter pipe T ₂ (see FIG. 13). The relay pipe 20c is disposed in the through hole 13 of the joint body 10c.
In the illustrated example, the length of the relay pipe 20c is the same as the length of the through hole 13, but it is not necessarily the same. However, if the length of the relay pipe 20c and the length of the through hole 13 are the same, the relay pipe 20c and the through hole 13 have the same size, and positioning becomes easy.

In the pipe connection structure using this pipe joint 3, as shown in FIG. 14, the relay pipe 20c is provided in the through hole 13 of the joint body 10c formed by integrating the two small diameter pipe insertion members B. is disposed, a small-diameter pipe _T 2, _{T 2} is inserted respectively into the small diameter pipe insertion hole 12, 12 of the fitting body 10c, further the end of the small diameter pipe _T 2, _{T 2} is inserted in the relay pipe 20c . In this way, the small diameter pipes T ₂ and T ₂ are connected to each other by the relay pipe 20c.

As a procedure for forming the pipe connection structure, for example, the following procedure (e) can be adopted, but is not limited thereto.
(E) One end of the relay pipe 20c is inserted into the hole 14b of one small diameter pipe insertion member B, and the other end of the relay pipe 20c is inserted into the hole 14b of the other small diameter pipe insertion member B. Thus, the pipe joint 3 is formed. Then, each insert a small diameter pipe T ₂ in each small-diameter pipe insertion hole 12 of the pipe joint 3, further inserting the inserted small diameter pipe T ₂ in the relay pipe 20c.

In the pipe joint 3 described above, since the diameter of the small diameter pipe insertion hole 12 is equal to approximately the outer diameter of the small diameter pipe T _2, the small-diameter pipe T ₂ are inserted while in close contact with the small-diameter pipe insertion hole 12. Here, since the joint body 10c of the small diameter pipe T ₂ is inserted is made of elastic polymeric material, the frictional force between the joint body 10c and the small diameter pipe T ₂ (adhesion) increases. Therefore, a small-diameter pipe T in ₂ when the fluid is depressurized flow was during or small pipe T in ₂ can secure sufficient airtightness, yet can have a sufficient connection strength.
Further, since the joint body 10c made of an elastic polymer material is easily deformed, the small-diameter pipes T ₂ and T ₂ can be easily connected to each other according to the pipe joint 3 as in the first embodiment. . Furthermore, the pipe joint 3 described above is also inexpensive for the same reason as in the first embodiment.

  In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described embodiment, the diameter of the pipe insertion hole is substantially the same as the outer diameter of the pipe, but the joint body is made of an elastic polymer material and easily deforms. The diameter of the pipe insertion hole may be smaller than the outer diameter of the pipe.

  Further, in the above-described embodiment, the joint main body is the one in which two members are integrated, but may be one member, or may be one in which three or more members are integrated. I do not care. However, if the joint main body is an integration of two members, the combination of the large-diameter pipe insertion member A and the small-diameter pipe insertion member B is changed as in the first to third embodiments described above. By doing, the kind of joint main body can be easily changed according to the outer diameter of the piping to connect. From this, the joint main body in the present invention is preferably one in which two members are integrated.

In the second embodiment described above has been connected to the large diameter pipe T _1, T ₁ each other may be connected to the small diameter pipe T _2, T ₂ together, in the third embodiment, the small diameter pipe T _2, was connected to T ₂ together, it may be connected to the large diameter pipe _T 1, _{T 1} together.

It is sectional drawing which shows the piping joint of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the coupling main body in 1st Embodiment. It is sectional drawing which shows the member for large diameter piping insertion which comprises the coupling main body of FIG. It is sectional drawing which shows the member for small diameter piping insertion which comprises the coupling main body of FIG. It is sectional drawing which shows the pipe | tube for relay in 1st Embodiment. It is sectional drawing which shows the connection structure of piping of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the piping joint of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the coupling main body in 2nd Embodiment. It is sectional drawing which shows the pipe for relays in 2nd Embodiment. It is sectional drawing which shows the connection structure of piping of 2nd Embodiment which concerns on this invention. It is sectional drawing which shows the piping joint of 3rd Embodiment which concerns on this invention. It is sectional drawing which shows the coupling main body in 3rd Embodiment. It is sectional drawing which shows the pipe for relay in 3rd Embodiment. It is sectional drawing which shows the connection structure of piping of 3rd Embodiment which concerns on this invention.

Explanation of symbols

1, 2, 3 Piping joints 10a, 10b, 10c Joint body 11 Large diameter pipe insertion hole 12 Small diameter pipe insertion hole 13 Through hole 14a, 14b Hole 20a, 20b, 20c Relay pipe A Large diameter pipe insertion member B Small diameter pipe Insertion member T ₁ Large diameter piping T ₂ Small diameter piping

Claims (6)

In a pipe joint that connects two pipes with different outer diameters,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body has a large-diameter pipe insertion hole into which a large-diameter pipe that has a larger outer diameter is inserted, a small-diameter pipe insertion hole into which a small-diameter pipe that has a smaller outer diameter is inserted, and a large-diameter pipe. The end of the pipe insertion hole and the end of the small diameter pipe insertion hole communicate with each other, and a through hole having a diameter substantially equal to the inner diameter of the large diameter pipe is formed.
The relay pipe has an entire outer diameter substantially equal to the diameter of the through hole of the joint body and the inner diameter of the large diameter pipe , and the entire inner diameter is substantially equal to the outer diameter of the small diameter pipe. Arranged in the range from the hole to the end side in the large-diameter pipe insertion hole ,
A pipe joint characterized in that a small-diameter pipe is inserted into one end of a relay pipe and the other end of the relay pipe is inserted into a large-diameter pipe . In a pipe joint that connects two pipes with the same outer diameter,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body is formed with two pipe insertion holes into which the respective pipes are inserted, and through holes having a diameter substantially equal to the inner diameter of the pipes, communicating with the terminal ends of the respective pipe insertion holes.
Relay tube outer径全body is substantially equal to the diameter and the inner diameter of the pipe of the through hole of the joint body, arranged from the through hole of the joint body to a range to the end side in each pipe insertion hole It is,
A pipe joint characterized in that one end of a relay pipe is inserted into one pipe and the other end of the relay pipe is inserted into the other pipe. In a pipe joint that connects two pipes with the same outer diameter,
It comprises a joint body made of an elastic polymer material and a relay pipe,
The joint body is formed with two pipe insertion holes into which the pipes are inserted, and through holes having a diameter larger than the outer diameter of the pipes, communicating the terminal ends of the pipe insertion holes.
Relay tube outer径全body is equal to approximately the diameter of the through hole of the joint body, and the entire inner diameter is substantially equal to the outer diameter of the pipe, is disposed in the through hole of the joint body ,
A pipe joint characterized in that one pipe is inserted into one end of a relay pipe and the other pipe is inserted into the other end of the relay pipe. The pipe joint according to any one of claims 1 to 3, wherein the relay pipe is made of a fluororesin. The joint body according to any one of claims 1 to 4, wherein the joint body is made of silicone rubber. A pipe connection structure in which two pipes are connected to each other by the pipe joint according to any one of claims 1 to 5 .

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