JPH04132290U - resin pipe fittings - Google Patents

Abstract

(57) [Summary] [Purpose] Has a strong retaining force, suppresses stress relaxation regardless of fluid temperature fluctuations, and ensures excellent sealing performance, and is also suitable for use with high-purity liquids and ultra-pure water. The purpose is to provide a resin pipe joint that can be used for. [Structure] An inner ring 2 that protrudes from one end of the tube 5 and is press-fitted into the one end of the tube 5 to expand the diameter of the one end of the tube 5. An inner ring 2 that does not hinder the movement of fluid, and a tube 5 that has the inner ring 2 press-fitted therein. A cylindrical socket for inserting the insertion part 50 of
10 is formed at one end, and the inner end seal portion 22 of the inner ring 2 protruding from one end of the pipe material 5 is connected to the socket 10.
A primary seal part 11 is formed at the back of the socket 10 to intersect with the axis of the socket 10 in order to contact the deep part of the socket 10, and a primary seal part 11 is screwed onto one end of the joint body 1. It is equipped with a press ring 4 which presses the inner ring 2 from the outside of the tube material 5 by screwing into the inner ring 2 and applies a sealing force to the inner end seal part 22 of the inner ring 2 and the primary seal part 11 of the socket 10.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to resin pipe joints, which have excellent sealing performance regardless of fluid temperature fluctuations. It also has flow path characteristics that can be applied to piping for high-purity liquids and ultra-pure water. Regarding resin pipe fittings.

0002

[Prior art]

As a resin pipe joint, one shown in FIG. 7, for example, is known. In the diagram, A is The cylindrical joint body has an axial direction at the entrance of the socket where one end of the pipe B1 is inserted. A seal portion a1 is formed by a tapered surface whose diameter gradually decreases inward. The outer ring D, which has a seal portion d1 at its inner end that abuts the seal portion a1, is attached to the pipe material B. It is fitted on the outside of the insertion part b1, thereby causing the tube B to locally bulge radially inward b2 At the same time, screw the female threaded part e1 of the push ring E into the male threaded part a2 at one end of the joint body A, By screwing this, the outer ring D is pressed toward the joint body A side, and the seal It is configured to provide sealing force to parts a1 and d1. Therefore, the pipe material B is restrained by the joint body A and the press ring E so that it cannot move in the axial direction. The outer ring D prevents the flow from coming off, and also prevents the flow inside the pipe material B. External leakage of the body and intrusion of foreign matter into the pipe material B are prevented by the sealing force of the seal parts a1 and d1 and The sealing force generated by the inner surface of the outer ring D coming into pressure contact with the bulge b2 prevents the It has stopped.

0003 Furthermore, a resin pipe joint shown in FIG. 8 is also known. This pipe fitting is for inserting pipe material B. At the entrance of the socket of the joint body A into which the inset part b1 is inserted, the diameter is gradually reduced inward in the axial direction. A seal part a1 is formed by a tapered surface, and a peripheral wall f having a trapezoidal cross section is formed. Press fit the inner ring F into the inside of the insertion part b1 of the tube B, thereby circumferentially surrounding the tube B. While locally bulging b3 radially outward along the wall f, one end of the joint body A is male threaded. By screwing the female threaded part e1 of the press ring E into part a2 and screwing it forward, the bulging part of the pipe material B is Press b3 and inner ring F toward the joint body A side, and align the inclined surface on the pipe end side of the bulge b3. It is configured to apply sealing force by pressing against the seal portion a1. Therefore, in the pipe material B, the bulging part b3 is the seal part a1 of the joint body A, and the push ring E. It is prevented from coming off by being clamped by the pressing part e2 and the peripheral wall f of the inner ring F. In addition, external leakage of the fluid in the pipe material B and intrusion of foreign matter into the pipe material B are prevented as described above. Sealing force generated when the slope of the tube end of the bulge part b3 is pressed against the seal part a1 This is prevented by

0004

[Problem that the idea aims to solve]

However, when using the conventional resin pipe joint shown in Fig. 7, the resin Stress relaxation occurs over time in the bulging part b2 of the tube material B, and as a result, the inner part of the outer ring D The sealing force between the surface and the outer surface of the bulge b2 decreases, impairing the sealing performance and preventing small fluid leaks. arise. Moreover, when the fluid is at a high temperature, the pipe material B softens and the stress at the bulge b2 is rapidly relaxed. As a result, the sealing force between the inner surface of the outer ring D and the outer surface of the bulged portion b2 is reduced for a short period of time. This will cause the fluid to leak. Furthermore, the stress relaxation of the bulged portion b2 of the tube material B increases the pull-out strength of the tube material B. This results in a significant decrease in the amount of water, and the tube material B becomes very easy to come off.

[0005] In addition, in the conventional resin pipe joint shown in Fig. 8, the pipe material B naturally forms at room temperature. The stress relaxation is less than that in Figure 7, so a slightly higher sealing performance can be secured. However, if the fluid is high temperature, the resin inner ring F will directly contact the fluid. Because the inner ring F is exposed to Therefore, Innari The stress relaxation of the tube F becomes significant, and the force pressing against the bulge b3 of the tube B decreases. The sealing force at the seal part a1 and the pressing part e2 of the push ring E is lost, preventing fluid leakage. I will invite you. Moreover, due to the stress relaxation of the inner ring F, the pull-out strength of the pipe material B is reduced. Then, the tube material B will be in a state where it can be easily removed.

[0006] Also, in both FIGS. 7 and 8, the bulge b2 or inner ring F Because the diameter is partially reduced and the cross section of the flow path changes significantly, smooth movement of fluid may be hindered. In particular, in the joint shown in Fig. 8, the outer surface of the peripheral wall f of the inner ring F and the inner surface of the bulged portion b3 are This causes fluid to stagnate in small gaps. Therefore, fluid stagnation Fittings that require smooth fluid movement to continuously supply high-purity liquid or ultra-pure water It is inappropriate to do so, and there are restrictions on its use.

[0007] This invention was developed in view of these circumstances, and has a strong retaining force and is suitable for fluids. Stress relaxation can be suppressed and excellent sealing performance can be ensured regardless of temperature fluctuations. Both are resin pipe fittings that can be suitably used for high-purity liquids and ultra-pure water. The purpose is to provide

[0008]

[Means to solve the problem]

The resin pipe joint of the first invention has one end of the pipe protruding from one end of the pipe. An inner ring that does not impede the movement of fluid that is press-fitted inside to expand the diameter of one end of the pipe material; A cylindrical socket is provided for inserting the insertion part of the pipe into which the inner ring is press-fitted. A joint body formed at one end, Insert the inner end seal part of the inner ring protruding from one end of the pipe into the depth of the socket. The primary seal part is formed at the back of the socket to intersect with the axis of the socket in order to make it come into contact with the socket. and, The inner part is screwed into one end of the joint body, and the inner Press the ring from the outside of the tube to seal the inner end seal of the inner ring and the socket. It is equipped with a press ring that applies sealing force to the primary seal portion.

[0009] The second idea is to press fit into one end of the pipe so that it protrudes from one end of the pipe. An inner ring that does not hinder the movement of the fluid that expands the diameter of one end of the material, A cylindrical socket is provided for inserting the insertion part of the pipe into which the inner ring is press-fitted. A joint body formed at one end, Insert the inner end seal part of the inner ring protruding from one end of the pipe into the depth of the socket. The primary seal part is formed at the back of the socket to intersect with the axis of the socket in order to make it come into contact with the socket. and, an outer ring that fits over the insertion portion of the tube material and has an inner end seal portion at the inner end; In order to bring the inner end seal portion of the outer ring into contact with the entrance of the socket, A secondary seal portion formed at the inlet to intersect with the axis of the socket; The pipe is screwed into one end of the joint body, and the pipe is screwed into the one end of the joint body. The insertion part of the material is sandwiched between the outer ring and the inner ring, and the outer Press the outer ring and the inner ring to seal the inner end of the outer ring and the inner end of the outer ring. The secondary seal part of the socket, the inner end seal part of the inner ring and the primary seal part of the socket It is equipped with a press ring that applies sealing force to the seal portion.

0010

[Effect]

According to the resin pipe joint of the first invention, by screwing the push ring into one end of the joint body, , a strong sealing force is generated between the primary seal part of the joint body and the inner end seal part of the inner ring. , fluid leakage is prevented. Moreover, the inner ring is strengthened in the axial direction by the push ring and the primary seal of the joint body. At the same time, the insertion part of the tube material is also tightly clamped in the axial direction. As the inner ring and the pipe insert are strongly clamped together, Even with high-temperature fluids or fluids with severe temperature fluctuations, stress relaxation is greatly suppressed, making it possible to Therefore, fluid leakage at the primary seal part of the joint body is effectively prevented. In addition, a decrease in the pull-out strength of the tube material is also effectively prevented. Also, is an inner ring press-fitted into one end of the pipe that does not impede fluid movement? This allows fluid to move smoothly, making it suitable as a pipe fitting for high-purity liquids and ultra-pure water. Can be used appropriately.

[0011] According to the resin pipe joint of the second invention, the insertion part of the pipe material cannot be moved in the axial direction. Stronger retaining force due to the tight inner ring and outer ring. The tubing is held in place. In addition, the same effect as that of the first invention described above is achieved. In addition, between the secondary seal part of the joint body and the inner end seal part of the outer ring, A strong sealing force is generated in a state where stress relaxation can be suppressed as much as possible.

0012

【Example】

FIG. 1 is a half-cut sectional view of a resin pipe joint according to an embodiment of the first invention. Pipe fittings are made of durable materials such as PFA, PTFE, ETFE, CTFE, and ECTFE. Joint body 1 made of resin with excellent chemical resistance and heat resistance properties , an inner ring 2 and a press ring 4.

[0013] The joint body 1 is cylindrical and has a socket 10 formed in at least one end thereof. A first primary seal part 11 is formed in the inner part of 10, and the first primary seal part 11 intersects with the axis C. A secondary seal portion 12 is also formed at the entrance of the socket 10 in a shape that crosses the axis C. Also, the reception A male threaded portion 13 is formed on the outer periphery of the mouth 10. The inner diameter of the socket 10 is larger than the inner diameter of the body 14. The inner part has a tapered surface that gradually reduces in diameter axially outward and reaches the radial inner surface of the body 14. Thus, the first primary seal portion 11 is formed. On the other hand, the secondary seal part 12 The diameter gradually increases from the back side of the mouth 10 toward the outside in the axial direction and reaches the base of the male threaded portion 13. It is formed by a surface. That is, the secondary seal portion 12 is formed at the entrance of the socket 10. It is.

[0014] The inner ring 2 has an outer diameter that can fit into the socket 10 of the joint body 1 at its inner end. A portion 20 is formed, and the vicinity of the connection portion with the fitting portion 20 is thicker than the wall of the pipe material 5. The press-fitting part 21, which has a small outer diameter for the time being, is formed continuously on the fitting part 20, and the overall shape is It has a sleeve shape. The inner circumference of this inner ring 2 is the inner circumference of the pipe material 5 and the joint. It is formed to have the same diameter as the inner circumference of the body portion 14 of the main body 1, that is, the same inner diameter or almost the same inner diameter. This ensures that fluid movement (flow) is not obstructed. Also, inside this inner ring 2 At the end, there is an inner end seal part 22 formed by a tapered surface that abuts the first primary seal part 11. is formed. On the other hand, the outer periphery of the outer end of the inner ring 2, that is, the press-fit portion 21 The outer circumference gradually expands in diameter from the outer end toward the inner end in the axial direction, and the outer end has an inner ring 2. A tapered outer end seal portion 23 is formed to intersect with the inner circumference of the outer end seal. The diameter of the top of the part 23 is at least larger than the outer diameter of the press-fit part 21 at the connection part with the fitting part 20. In the illustrated example, it is set larger than the outer diameter of the fitting part 20 of the inner ring 2. ing. That is, the large diameter side of this outer end seal portion 23 is located outside the outer end of the inner ring 2. A bulge 24 with a chevron-shaped cross section is formed on the circumferential surface. From the top of this bulge 24 The tapered surface 25 whose diameter gradually decreases toward the inner end of the inner ring 2 has an inclination angle equal to that of the joint. It matches the inclination angle of the secondary seal part 12 of the hand body 1, and the inner end seal part 22 Opposing distance between the secondary seal part 12 and the tapered surface 25 when it comes into contact with the primary seal part 11 is formed so as to correspond to the wall thickness of the tube material 5. Innarin made in this way The plug 2 press-fits the press-fitting part 21 into one end of the pipe 5 to expand the diameter of the peripheral wall of the one end of the pipe 5. with the fitting part 20 of the inner ring 2 protruding from one end of the tube 5. It is integrally connected with the tube material 5 of. At this time, the enlarged diameter portion of the peripheral wall of the pipe material 5 is connected to the joint body 1. This becomes an insertion part 50 that is inserted into the socket 10. In addition, the insertion part 50 is inserted into the socket 10. In the inserted state, the inner end seal portion 22 contacts the first primary seal portion 11 of the joint body 1. At the same time, the outer end seal portion 23 is in contact with the inner surface of the inclined portion 51 of the insertion portion 50. There is. Furthermore, between the secondary seal portion 12 of the joint body 1 and the tapered surface 25 of the inner ring 2, One end of the tube member 5 is held in an inclined state. In other words, the inner ring 2 The outer circumferential surface of the pipe material 5 deformed along the pass surface 25 becomes the outer circumferential sealing surface 5a and forms a secondary sealing part. Contact with 12.

[0015] The push ring 4 has a female push ring screwed onto the inner peripheral surface of the cylindrical portion 40 and the male threaded portion 13 of the joint body 1. A threaded portion 41 is threaded, and an annular pressing piece 42 extending toward the axis is formed at the outer end. It will be done. A pressing edge portion 44 is formed at the inner end of the pressing piece 42 on the inner surface side. child The pressing edge portion 44 is formed not only at the top of the bulging portion 24 but also outside the area adjacent to the fitting portion 20. It is set closer to the axis than the diameter.

[0016] The press ring 4 formed in this way has the inner ring 2 attached to the joint body 1 side through the pipe material 5. Pressing (more specifically, pressing the joint body 1 and inner ring 2 against each other) Press the pipe material 5 toward the joint body 1 (in detail, press the joint body 1 and the pipe material 5 against each other). ), the joint body 1, inner ring 2 and pipe material 5 are integrally connected. The inner end seal portion 22 of the inner ring 2, the primary seal portion 11 of the socket 10, and It provides a sealing force to the outer peripheral seal surface 5a of the pipe material 5 and the secondary seal portion 12 of the socket 10. .

[0017] In the above configuration, the press-fitting part 21 of the inner ring 2 is first press-fitted into one end of the pipe material 5. As a result, one end of the tube member 5 expands in diameter as a whole, and the bulge 24 of the inner ring 2 The position corresponding to the position corresponds to the insertion port 50 with a further enlarged diameter. And in this way The inner ring 2 press-fitted into one end of the pipe material 5 and the insertion part 50 at one end of the pipe material 5, Insert it into the socket 10 of the joint body 1 and bring the inner end seal part 22 into contact with the first primary seal part 11. Then, insert the female screw part 41 of the push ring 4, which has been loosely fitted into the pipe material 5 in advance, into the male screw part of the joint body 1. By screwing the pipe material 5 into the joint part 13 and tightening it strongly, the pipe material 5 is attached to the joint body. It can be connected to the body 1.

[0018] By connecting the tube material 5 in this way, the insertion portion 50 of the tube material 5 can be inserted in the axial direction. The inner ring 2 is sandwiched between the inner ring 2 and the press ring 4, and the inner ring 2 is press-fitted. It is also clamped by the secondary seal part 12 of the socket 10 and the inner ring 2. It is also locally clamped by the outer end seal portion 23 and the pressing edge portion 44 of the press ring 4. death Therefore, the tube material 5 is held with a strong force to prevent it from coming off and moving. In addition, by screwing the press ring 4 and tightening it strongly, the first primary cylinder of the joint body 1 can be The ring portion 11 and the inner end seal portion 22 of the inner ring 2 are pressed against each other, creating a strong adhesion between them. Jiru. At the same time, the secondary seal portion 12 of the joint body 1 and the outer peripheral seal surface of the pipe material 5 5a, and further the outer end seal part 23 of the inner ring 2 and the pipe material 5 which becomes the second primary seal part. The inner surfaces of the inclined portions 51 of the pipe material 5 are also pressed against each other, and a strong sealing force is generated between them. A seal is made on both the outer and inner circumferences of one end. Therefore, this resin pipe fitting By hand, press between the joint body 1 and the inner ring 2 and between the inner ring 2 and the pipe material 5. A primary seal is formed, ensuring excellent sealing and preventing fluid leakage. or foreign matter can be reliably prevented from entering. In addition, a secondary seal is provided between the joint body 1 and the pipe material 5. Therefore, in the unlikely event that the above-mentioned Even if the primary seal fails, this secondary seal will prevent fluid from leaking or leaking. Intrusion of foreign matter is prevented, and the reliability of the seal is extremely high. Moreover, this In the case of a resin pipe joint, the joint body 1 and push ring 4 are connected at all three seal parts. Since the axial pressing force is applied by cooperation, it is possible not only at room temperature but also when using fluids. Even when the temperature rises, seal breakage due to stress relaxation is suppressed and excellent sealing performance is ensured. can.

[0019] Furthermore, the inner periphery of the inner ring 2 is connected to the inner periphery of the pipe material 5 and the inner periphery of the body 14 of the joint body 1. Since it is formed to have the same diameter as the circumference so as not to impede the movement of fluid, the cross section of the flow path is This ensures uniform flow path characteristics that allow the fluid to move smoothly without stagnation. Therefore, it can also be used as a joint for high-purity liquids and ultra-pure water.

[0020] In addition, in the resin pipe joint shown in FIG. 1, the inner end seal portion of the inner ring 2 22 is formed as an inclined surface inclined at the same angle as the first primary seal portion 11 of the joint body 1. However, as shown in Figure 2, the inclination angle of the inner end seal part 22 and the first primary seal part 11 is A difference is made between the They may be in contact with each other, and in this way, a particularly strong sealing force can be applied to the radially inner end 6. Since the fluid can be concentrated, the function of suppressing fluid stagnation is improved.

[0021] In addition, as shown in FIG. When forming a recess 7 on one side (for example, the inner end seal portion 22), In this structure, a convex portion 8 that fits into the concave portion 7 is formed on the other side (first primary seal portion 11). May be completed.

[0022] FIG. 5 is a half-cut sectional view of a resin pipe joint according to an embodiment of the second invention. In this case, the same or almost the same parts as in the case of the resin pipe joint shown in Fig. 1 symbol, and detailed explanation thereof will be omitted below. This resin pipe joint consists of a joint body 1, an inner ring 2a, an outer ring 3, and a It is composed of a ring 4.

[0023] The inner ring 2a includes a fitting portion 20 similar to the aforementioned inner ring 2a. but, The press-fit portion 21a of this inner ring 2a differs from the press-fit portion 21 of the above-mentioned one in that the outer circumferential seal surface Does not have 25. In other words, the outer end seal formed on the outer periphery of the outer end of this press-fit portion 21a The diameter of the portion 23a gradually increases from the outer end toward the inner end in the axial direction, and the outer end is connected to the inner ring 2a. Although it intersects with the inner diameter of the press-fit part 21a, its maximum outer diameter Therefore, this press-fit part 21a does not have a bulge on its outer periphery. . Therefore, the press-fit portion 21a of this inner ring 2a is press-fitted, and the socket 10 of the joint body 1 is press-fitted. The insertion portion 50a of the pipe material 5 inserted into the pipe is only uniformly expanded in diameter as a whole. do not have. Even when this insertion part 50a is inserted into the socket 10, the inner end seal part 22 is connected. The outer end seal portion 23 is abutted against the first primary seal portion 11 of the hand body 1, and the outer end seal portion 23 is attached to the tube material 5 However, the pipe material 5 contacts the secondary seal portion 12 of the joint body 1. Never.

[0024] The outer ring 3 has an inner diameter that is fitted onto the insertion portion 50a of the pipe material 5 and the outer diameter of the joint body 1. The diameter is set to be slightly smaller than the inner diameter of the female threaded portion 40 of the press ring 4 that is screwed into the male threaded portion 13. an inner end having an outer diameter and a tapered surface that abuts the secondary seal portion 12; A sealing surface 30 is formed, and the outer end 31 is perpendicular to the axis C and the inner end of the pressing piece 42 of the pressing ring 4. It is formed to abut against the surface 43. In the resin pipe joint shown in FIG. 2, the inner end surface 43 of the pressing piece 42 of the pressing ring 4 is It functions as a pressing surface that presses the talling 3. Therefore, here the push ring 4 is a tube. Press the inner ring 2a against the joint body 1 side through the material 5 (for details, press the inner ring 2a against the joint body 1 side and inner ring 2a) and press the outer ring 3 onto the joint body 1. (For details, press the joint body 1 and outer ring 3 against each other.) ), joint body 1, inner ring 2a, outer ring 3, and pipe material 5 are integrally connected. It functions to maintain the temperature and provide a sealing force.

[0025] In the resin pipe joint shown in Figure 5 above, the press-fit portion 21a of the inner ring 2a is press-fitted. Insert the insertion part 50a of the pipe material 5 into the socket 10 of the joint body 1, and insert the inner end seal part 22 into the first The outer ring is brought into contact with the primary seal portion 11 and then loosely fitted into the pipe material 5 in advance. After bringing the inner end sealing surface 30 of 3 into contact with the secondary sealing part 12 of the joint body 1, Screw the female threaded part 40 into the male threaded part 13 of the joint body 1, screw it in, and tighten it firmly. By doing so, the pipe material 5 can be connected. In this case, the retaining force against the tube material 5 is that the insertion portion 50a is The press-fit portion 21a of the inner ring 2a is clamped by the inner circumferential surface of the outer ring 3, and The outer end seal portion 23a and the pressing edge portion 44 of the press ring 4 may also be locally clamped. It is caused by.

[0026] Also, among the seals formed by screwing the press ring 4, the primary seal , that is, the first primary seal portion 11 of the joint body 1 and the inner end seal portion of the inner ring 2a. 22a and the outer end seal part 23a of the inner ring 2a and the inclined part 51a of the pipe material 5 The seal between them is formed in the same way as in the case of the resin pipe joint shown in FIG. On the other hand, this figure In the case of the resin pipe joint shown in 5, the secondary seal is the secondary seal part 12 of the joint body 1 and the outer It is formed by pressing the inner end sealing surface 30 of the sealing ring 3 into contact with each other. Like this This resin pipe joint By hand, the overall sealing force of the secondary seal compared to the resin pipe joint shown in Fig. 1 was determined by hand. The ratio of the sealing force of the primary seal is higher than the ratio of the sealing force of the primary seal.

[0027] Even in the resin pipe joint shown in Fig. 5, a uniform flow path cross section is formed. Of course, it is possible to move the fluid smoothly without stagnation. .

[0028] In addition, as shown in FIG. 6, the secondary seal portion 12 of the joint body 1 and the inner end of the outer ring 3 Two pressure contact surfaces 121, 122, 30 perpendicular to the axis C and displaced in the axial direction make the sealing surface 30a 1a, 302a may be formed in a stepped shape.

[0029]

[Effect of the idea]

As described above, according to the first invention, the primary seal part of the joint body and the inner ring A strong sealing force can be generated at the inner end sealing part of the Body leakage can be effectively prevented. In addition, even when applied to high-temperature fluids or fluids with large temperature fluctuations, inner rings and pipe materials The insertion part of the fitting is designed to be difficult to relax stress, so the primary seal of the fitting body is In addition to effectively preventing fluid leakage at the It is also possible to effectively prevent a decrease in strength. Also, is an inner ring press-fitted into one end of the pipe that does not impede fluid movement? This allows fluid to move smoothly, making it suitable as a pipe fitting for high-purity liquids and ultra-pure water. Can be used appropriately.

[0030] According to the second invention, there is a double bond between the joint body and the outer ring that has an extremely high sealing force. A second seal is formed and a primary seal is formed which is almost the same as in the case of the first invention. Therefore, highly reliable sealing performance can be obtained. Also, it does not move in the axial direction. The pipe material is held in place by the inner ring and outer ring, so the pipe material is Can be connected with stronger retaining force.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view of a first invention resin pipe joint.

2 is a partial sectional view for explaining the effect of a modified example of the first primary seal portion and the inner end seal portion in the resin pipe joint of FIG. 1; FIG.

3 is a partial sectional view for explaining the functions of the first primary seal portion and the inner end seal portion of FIG. 2; FIG.

FIG. 4 is a partial sectional view showing another modification of the first primary seal portion and the inner end seal portion.

FIG. 5 is a half-cut sectional view of the resin pipe joint of the second invention.

6 is a half-cut sectional view showing a modification of the resin pipe joint of FIG. 5. FIG.

FIG. 7 is a half-cut sectional view of a conventional example.

FIG. 8 is a half-cut sectional view of still another conventional example.

[Explanation of symbols]

1 Joint body 2 Inner ring 3 Outer ring 4 Press ring 5 Piping material 5a Outer seal surface 10 socket 11 Primary seal part 12 Secondary seal section 13 Male thread part of the fitting body 22 Inner end seal of inner ring 24 Bulge 30 Inner end seal of outer ring 41 Female thread part of press ring 50, 50a insertion part C Socket axis

Claims (2)

[Scope of utility model registration request] 1. An inner ring that protrudes from one end of the tube and is press-fitted into the one end of the tube to expand the diameter of the one end of the tube. An inner ring that does not impede movement of fluid, and insertion of the tube into which the inner ring is press-fitted. A joint body having a cylindrical socket formed at one end for inserting the pipe member, and an inner end seal part of the inner ring protruding from one end of the pipe material to abut against the deep part of the socket. A primary seal formed at the back of the socket intersecting the axis of the socket is screwed to one end of the joint body, and by screwing into the one end of the joint body, the inner ring is removed from the outside of the pipe material. A resin pipe joint characterized in that it comprises a press ring that applies sealing force to the inner end seal portion of the inner ring and the primary seal portion of the socket by pressing. 2. An inner ring that protrudes from one end of the tube and is press-fitted into the one end of the tube to expand the diameter of the one end of the tube without hindering movement of fluid; and insertion of the tube into which the inner ring is press-fitted. A joint body having a cylindrical socket formed at one end for inserting the pipe member, and an inner end seal part of the inner ring protruding from one end of the pipe material to abut against the deep part of the socket. A primary seal part formed in the inner part of the socket to intersect with the axis of the socket, an outer ring that fits onto the insertion part of the pipe material and has an inner end seal part at the inner end; a secondary seal part formed at the entrance of the socket in a manner intersecting with the axis of the socket in order to bring the inner end seal part into contact with the entrance of the socket, and screwed to one end of the joint body; The insertion part of the pipe material is sandwiched between the outer ring and the inner ring by screwing into one end of the joint body, and
Pressing the outer ring and the inner ring to apply sealing force to the inner end seal part of the outer ring and the secondary seal part of the socket, as well as to the inner end seal part of the inner ring and the primary seal part of the socket. A resin pipe joint characterized by comprising a press ring.