JPH0590089U - Resin fitting - Google Patents

Abstract

(57) [Summary] [Purpose] Excellent sealability and reliable prevention of pipe material falling off. [Structure] A core 11 having an inner diameter set to be larger than the inner diameter of the pipe material 14, and a core 11 having an inner diameter set to be larger than the inner diameter of the pipe material 14, the inner diameter being set to be the same as the inner diameter of the pipe material 14. It is composed of a main body 12, a pipe material 14 screwed into the main body 12 and into which the core 11 is press-fitted, and a cap nut 13 connecting the main body 12. The socket portion 1 in which the outer diameter of the main body 12 is formed to be the same as the inner diameter of the core 11 and the front end surface serves as the sealing surface 16A
6 and a retaining wall portion 17A which is formed on the outer side of the socket portion 16 and which holds the pipe material 14 between the outer peripheral surface 11B of the core 11 and prevents the pipe material 14 from falling off. In the threaded state, the cap nut 13 is opposed to the sealing surface 16A at the tip of the socket and
It has a tube restraining portion 23 that presses 4 against the sealing surface 16A.
The pressure contact surfaces of the screws are formed perpendicular to the screwing direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a resin pipe joint in which a pipe material used for supplying a chemical liquid such as sulfuric acid or another liquid to a predetermined place can be removed for maintenance or the like.

[0002]

[Prior Art]

 As a conventional resin pipe joint, there is one having a structure as shown in FIG.

In the figure, 1 is a joint body, 2 is an inner ring, 4 is a cap nut, and 5 is a pipe material. The inner ring 2 is inserted into the pipe member 5, and the inner ring 2 is inserted into the insertion opening 1A of the joint body 1. In this state, the cap nut 4 is screwed into the joint body 1, and the pressing edge portion 4A of the bag nut 4 presses the bulging portion 6 of the inner ring 2 to seal between the inner ring 2 and the joint body 1. At the same time, the pipe material 5 is prevented from falling off.

An example of this is the invention described in Japanese Utility Model Laid-Open No. 2-117494.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional resin pipe joint, since the chemicals such as sulfuric acid may flow into the inside at high temperature, the sealing property at the joint part is important, but in the resin pipe joint, the sealing part is the inner part. There are two places, a sealing surface 7 between the ring 2 and the joint body 1 and a sealing surface 8 between the inner ring 2 and the pipe material 5, and the more sealing points there are, the greater the possibility of liquid leakage.

Further, since a secondary seal portion is provided between the pipe material 5 and the inner ring 2 and between the pipe material 5 and the inner peripheral surface of the insertion opening 1 A, the retaining function of the pipe material 5 is mainly due to the cap nut 4. It is provided in the pressing edge portion 4A. For this reason, when the pipe material 5 is softened by a high temperature chemical, it becomes difficult to reliably support and prevent the pipe material from being pulled out.

Furthermore, since the end of the inner ring 2 is pressed by the pressing edge portion 4A in a state where the inner ring 2 directly faces the flow path, the inner ring 2 is softened by the high temperature fluid and is bent inward. The resistance of the flow path is reduced and the sealing property is reduced.

As a result, there is a problem in that the reliability of the resin pipe joint is lacking.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable resin pipe joint that has excellent sealing properties and can reliably prevent the pipe material from falling off.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is a resin pipe joint in which pipes are connected to form a continuous flow path. In addition to having a core which is bulged and whose inner diameter is set to be larger than the inner diameter of the pipe material and an internal flow path which forms a continuous flow path by connection with the pipe material, the inner diameter of this internal flow path is It consists of a joint body that has a diameter equal to or greater than the inner diameter, and a pipe material that is screwed into the joint body and that press-fits the core and a cap nut that connects the joint body. It is formed so as to extend cylindrically at the end of the flow path, and its outer diameter is formed to be the same as the inner diameter of the core, and the tip surface becomes the sealing surface that seals the inside of the flow path by contacting the pipe material. The socket part and the outside of the socket part The contact surface is the surface facing the outer peripheral surface of the core mounted in the socket, and the retaining wall part that holds the pipe material between this contact surface and the outer peripheral surface of the core to prevent it from falling off. The cap nut has a pressing surface formed inside the pipe material insertion port so as to face the sealing surface at the tip of the socket portion while being screwed to the joint body.

A male screw is provided on the outer circumference of the joint body, and a female screw is provided on the inner circumference of the cap nut. The pressure contact surfaces of the threads are perpendicular to the screw nut advancing direction. It is desirable to form

[0012]

[Action]

 With the above configuration, when the core press-fitted into the pipe material is attached to the socket part and the cap nut is screwed, the pipe material is pressed against the sealing surface at the tip of the socket part by the pressing surface of the cap nut to seal the inside of the flow path. The core is pressed to hold the pipe material between the retaining wall and the outer periphery of the core to prevent the core from falling off.

Further, since the screws come into contact with the pressure contact surface formed perpendicularly to the screw nut advancing direction, it is possible to reliably prevent the cap nut from loosening.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a resin pipe joint 10 according to this embodiment. The resin pipe joint 10 mainly includes a core 11, a joint body 12, and a cap nut 13. In this embodiment, since the two pipe members 14 and 15 are connected by the resin pipe joint 10, the core 11 and the cap nut 13 are attached to both sides of the joint body 12. Since the joint portions on both sides have the same structure, the present embodiment will be described focusing on one joint portion (the pipe member 14 side joint portion).

The core 11 is formed in a substantially tubular shape as a whole, and is press-fitted into the tube material 14 through the tip opening of the tube material 14 to swell the end portion of the tube material 14. The inner diameter of the core 11 is set larger than that of the pipe material 14, and is the same as the outer diameter of the socket portion 16 so that the core 11 can be inserted into the socket portion 16 of the joint body 12 described later. A flange portion 11A is provided on one end side of the core 11 (the tip end side of the pipe material 14 which is the right side in FIG. 3), and the front end portion of the inserted pipe material 14 is supported by abutting. The outer circumference of the core 11 is gradually expanded from the flange portion 11A toward the other end side (the left side in FIG. 3), and the diameter is sequentially reduced from the middle, and the intermediate portion is bulged as a whole. There is. The expanded diameter portion from the flange portion 11A to the other end side is the first tapered surface 11B, and conversely the reduced diameter portion is the second tapered surface 11C. The first taper surface 11B and the retaining wall portion 17A of the retaining cylinder portion 17 described later sandwich the tip end portion of the pipe member 14 to prevent it from falling off.

The joint main body 12 is formed in a tubular shape as a whole, and an internal flow passage 12 A is provided inside the joint main body 12 to form a continuous flow passage with the pipe members 14 and 15. The diameter of the internal flow passage 12A is set to be the same as the inner diameter of the pipe materials 14 and 15. A socket 16 for inserting the core 11 is formed at the end of the joint body 12 (the end on the side of the pipe material 14). The inner diameter of the socket portion 16 is set to be the same as the inner diameter of the pipe member 14 as an extension of the internal flow passage 12A, and the tip end portion is a sealing surface 16A. The seal surface 16A is formed in a gentle curved shape in consideration of the elasticity of the pipe material 14, that is, the characteristic that the pipe material 14 cannot be bent extremely much.

Further, on the outside of the socket portion 16 of the joint body 12, the inner periphery of which is tapered at a position facing the first tapered surface 11B of the core 11 mounted in the socket portion 16 A retaining cylinder portion 17 having a wall portion 17A is formed. An annular groove (not shown) is provided on the retaining wall portion 17A so as to securely retain the pipe material 14 sandwiched between it and the first tapered surface 11B of the core 11 on the entire inner surface thereof to prevent the pipe material 14 from falling off. Are formed in large numbers. Further, a large number of annular grooves are similarly formed on the first tapered surface 11B of the core 11. As a result, with the core 11 press-fitted in the pipe material 14 mounted in the socket portion 16, the tip end portion of the pipe material 14 is sandwiched between the first tapered surface 11B of the core 11 and the retaining wall portion 17A, 14 is prevented from falling out of the resin pipe joint 10.

A male screw portion 21 to be screwed with the cap nut 13 is formed on the outer periphery of the joint body 12. The male screw portion 21 has a press contact surface with a female screw portion 13A of a cap nut 13 which will be described later formed in a direction perpendicular to the screw advancing direction of the cap nut 13. Here, the pressure contact surfaces of the male screw portion 21 and the female screw portion 13A are surfaces which are strongly pressed when a force acts in a direction in which the cap nut 13 screwed to the joint body 12 is removed (leftward in the figure). In FIG. 3, it refers to the right side surface of the male threaded portion 21 and the left side surface of the female threaded portion 13A. It should be noted that, of course, the opposite surface of the joint portion on the side of the pipe member 15 is formed in the direction perpendicular to the screwing direction.

A pipe material insertion port 22 is provided at one end (left end in the figure) of the cap nut 13 (cap nut of the pipe material 14 side joint portion), and the pipe material 14 is inserted therein. At the inner end of the pipe material insertion port 22, a pipe restraining portion 23 for sandwiching the pipe material 14 with the sealing surface 16A of the socket portion 16 is formed. The tube restraining portion 23 is formed on a curved surface in conformity with the curved seal surface 16A of the socket portion 16. Then, the pipe material 14 is sandwiched between the pipe restraining portion 23 and the seal surface 16A of the socket portion 16 so that the seal surface 16A and the inner surface of the pipe material 14 are brought into pressure contact with each other to seal the inside of the flow path and prevent the pipe material 14 from falling off. is doing. Further, the pipe restraining portion 23 pushes the other end of the core 11 via the pipe material 14, and pushes the core 11 between the socket portion 16 and the retaining cylinder portion 17 in a wedge shape. As a result, the first tapered surface 11B of the core 11 is pressed against the retaining wall portion 17A of the retaining tubular portion 17, and the tip end portion of the pipe material 14 is sandwiched between them to prevent the tubular member 14 from falling off. A female screw portion 13A that is screwed with the male screw portion 21 of the joint body 12 is provided on the inner side of the portion of the cap nut 13 that is screwed with the joint body 12.

The joint portion on the side of the pipe material 15 has the same structure as described above.

With the above configuration, when connecting the pipe materials 14 and 15, the core 11 is first press-fitted into the respective tip portions of the pipe materials 14 and 15. At this time, each of the pipe members 14 and 15 is press-fitted until its tip end contacts the flange portion 11A of the core 11. Next, the cores 11 press-fitted into the pipe materials 14 and 15 are inserted into the socket portions 16 on both sides of the joint body 12 respectively, and the cap nuts 13 are screwed.

By the screwing of the cap nut 13, the pipe holding portion 23 presses the pipe materials 14 and 15 against the sealing surface 16 A of the socket portion 16 to seal the inside of the flow path at this portion, and at the same time, to seal the pipe holding portion 23. The pipes 14 and 15 are sandwiched by the surface 16A to prevent the pipes 14 and 15 from falling off. At the same time, the tube restraining portion 23 also presses the base end portion of the core 11. As a result, the core 11 is wedge-shaped inserted between the socket portion 16 and the retaining cylinder portion 17, and the first tapered surface 11B of the core 11 and the retaining wall portion 17A of the retaining cylinder portion 17 are separated from each other. The tip ends of the pipe members 14 and 15 are sandwiched between them to prevent the pipe members from falling off.

Further, since the female screw portion 13A and the male screw portion 21 have their pressure contact surfaces formed in a direction perpendicular to the screw advancing direction of the cap nut 13, once the cap nut 13 is squeezed, the cap nut 13 hardly loosens. .. That is, in the case of a screw having a mountain shape with an inclined surface as in the prior art, when heated and softened, a gap occurs between the contact surfaces of the screw threads that are tightened, and the thread is lifted and the screw is loosened. However, by forming the pressure contact surfaces of the screw portions 13A and 21 in the vertical direction, it is possible to reliably prevent lifting and prevent loosening of the screws.

Further, since the core 11 is supported by the socket portion 16 without making direct contact with the flow path, there is a problem that the core 11 is deformed to become flow path resistance or the sealing property is deteriorated as in the prior art. Disappear.

As described above, the pipe members 14 and 15 can be easily connected, and the inside of the flow path can be reliably sealed.

The pipe members 14 and 15 can be easily removed by loosening and removing the cap nut 13. This makes it possible to easily remove and install various devices, such as those around the part where the resin pipe joint is located, during maintenance. Is greatly improved.

Further, even if the pipe members 14 and 15 are repeatedly attached and detached, the sealing surface 16A of the socket portion 16 is formed into a gentle curved shape, so that the pipe members 14 and 15 can be kept from being overloaded and the sealing performance can be improved. It will not drop.

In the present embodiment, the case where the pipe member 14 and the pipe member 15 are connected has been described as an example. However, when the pipe member 14 is connected to another portion, the connecting portion of the joint body 12 is provided only on one side thereof. The other side is integrally attached to the connecting portion of the pipe member 14. The pipes 14 are connected to, for example, valves, pumps, filters and the like.

Further, although the sealing surface 6A of the socket portion 16 is formed to be curved in the above-described embodiment, it may be formed to be a flat surface perpendicular to the axial direction of the joint body 12 as shown in FIG. .. In this case, the pipe restraining portion 23 faces the sealing surface 16A and holds the pipe material 14 to seal the inside of the flow path and the vertical surface portion 23A and the outer peripheral edge portion of the sealing surface 16A formed at a right angle (outside the tip of the socket portion 16). In order to prevent the tubular material 14 from being pressed against the peripheral edge portion 16B and falling off, the tubular material restraining surface 23B is formed in a curved surface so as to cover the outer peripheral edge portion 16B. Then, the pipe material 14 is sandwiched between the vertical surface portion 23A of the pipe restraining portion 23 and the sealing surface 16A, the sealing surface 16A and the inner surface of the pipe material 14 are pressed against each other to seal the inside of the flow path, and The pipe member 14 is sandwiched between it and the outer peripheral edge portion 16B to prevent the pipe member 14 from falling off. The sealing surface 16A has a width (thickness of the socket portion 16) set to be about twice the thickness of the pipe member 14 in consideration of the sealing property.

In addition to the case where the sealing surface 16 A of the socket portion 16 is a surface perpendicular to the axial direction of the joint body 12, when the pipe materials 14 and 15 have sufficient elasticity, As shown in, the sealing surface 16A of the socket portion 16 may be formed with a slight inclination. This inclination is set (inclined to the left in the figure) so that when the pipe material 14 is pressed against the sealing surface 16A, the tip of the socket 16 expands (upward in the portion shown in the figure). There is.

Further, as shown in FIG. 6, the core 11 has a structure in which the flange portion 11 A is not provided, and the tip portion 14 A of the pipe material 14 is made to contract inward from the end portion of the core 11 so that the core 11 is The tip end portion of the pipe member 14 may be sandwiched between the tip end surface 11D of the core 11 and the base end surface 12D of the joint body 12 in the state of being attached to the socket portion 16. As a result, the pipe material 14 can be held more reliably. In this case, it goes without saying that the shape of the sealing surface 16A of the socket portion 16 may be any of the shapes described above.

Further, in the above embodiment, the inner diameter of the internal passage 12 A of the joint body 12 is set to be the same as the inner diameter of the pipe material 14, but it may be formed larger than the inner diameter of the pipe material 14. The inner diameter of the internal flow path 12A in this case is set as follows. The joint body 12 is made of resin and is slightly deformed. In particular, the inner diameter of the socket portion 16 may be slightly contracted due to the contracting force of the pipe material 14 or the contracting force when the cap nut 13 is tightened. The degree of shrinkage depends on the overall shape of the resin pipe joint, the material used, and the like. Therefore, in consideration of the degree of contraction of the socket portion 16, the inner diameter of the socket portion 16 is set so as to have the same diameter as the inner diameter of the pipe material 14 at the time of contraction. Further, as the set inner diameter, in addition to the case where the entire inner flow passage 12A has the same inner diameter, only the socket portion 16 may be expanded in consideration of contraction of the socket portion 16. In this case, the inner diameter of the socket portion 16 is usually set in a tapered shape due to its shape. As a result, it is possible to reliably prevent the tip end portion of the socket portion 16 from bending inward and extending into the flow path to form flow path resistance.

[0034]

[Effect of the device]

 As described above in detail, according to the resin pipe joint of the present invention, the pipe material can be easily connected and the inside of the flow path can be surely sealed. In addition, the pipe material can be easily removed by loosening the cap nut and removing it. Since this attachment and detachment is easy, workability during maintenance is greatly improved.

Furthermore, since the pressure contact surfaces of the female screw and the male screw are formed in the direction perpendicular to the screw nut advancing direction, the cap nut will not loosen if it is tightened once, and the reliability of the resin pipe joint will be improved. Is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a resin pipe joint according to the present invention.

FIG. 2 is a partial cross-sectional view showing a conventional resin pipe joint.

FIG. 3 is a partial cross-sectional view showing a main part of the resin pipe joint of FIG.

FIG. 4 is a partial cross-sectional view showing a first modified example.

FIG. 5 is a partial cross-sectional view showing a second modified example.

FIG. 6 is a partial cross-sectional view showing a third modified example.

[Explanation of symbols]

10 ... Resin pipe joint, 11 ... Core, 11B ... 1st taper surface, 12 ... Joint main body, 12A ... Internal channel, 13 ... Cap nut, 14, 15 ... Pipe material, 16 ... Socket part, 16A ... Sealing surface, 16B ... outer peripheral edge portion, 17 ... retaining cylinder portion, 17A
... wall for preventing slip-off, 21 ... male screw part, 23 ... pipe holding part, 2
3A ... Vertical surface portion, 23B ... Tubing material restraining surface.

Claims (2)

[Scope of utility model registration request] 1. A resin pipe joint for connecting pipes to form a continuous flow path, which is formed into an annular shape or a tubular shape and is press-fitted from one end of the pipe to the inside to bulge the end of the pipe and its inner diameter. Has a core set to be larger than the inner diameter of the pipe material, and has an internal flow path that forms a continuous flow path by connection with the pipe material, and the internal flow path has an inner diameter that is the same as or larger than the inner diameter of the pipe material. And a cap nut that is screwed into the joint body and press-fits the core to connect the joint body to the joint body.The joint body has a tubular shape at the end of the internal flow path. A socket portion that is formed to extend and is formed so that its outer diameter is the same as the inner diameter of the core, and the tip end surface is a sealing surface that seals the inside of the flow path by contacting the pipe material, Formed and mounted in the socket part A surface facing the outer peripheral surface of the core serves as a contact surface, and has a retaining wall portion that holds the pipe material between the contact surface and the outer peripheral surface of the core to prevent the core material from falling off, the cap nut The resin pipe joint has a pressing surface formed inside the pipe material insertion port so as to face the sealing surface at the tip of the socket portion while being screwed to the joint body. 2. A male screw is provided on the outer periphery of the joint body, and a female screw is provided on the inner periphery of the cap nut, and the respective pressure contact surfaces of the threads are formed perpendicular to the screw nut advancing direction. The resin pipe joint according to claim 1, wherein