JPS6353386A - Joint made of resin - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is related to Japanese Patent Application No. 60-267953 (hereinafter referred to as the earlier application) and has the same purpose. The earlier application mainly focused on tetrafluoroethylene resin (T F E
), which relates to a sealed joint structure using a fluororesin such as a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (PFA), and has been filed by the present inventor.

The previous application was not able to sufficiently fulfill its purpose in terms of leak resistance against high temperatures, high pressures, and deleterious fluids, and with regard to the pull-out resistance of the jointed objects, it was found that a separate grip mechanism was required for thick tape. As a result, the number of parts increased and the workability was poor.Thin duplexes do not have an independent grip mechanism, so it is difficult to determine whether it is possible to use only one part to serve as both the sole and the grip. Therefore, the root part of the band-shaped noul part acts as a ferrule to suppress and deform the outer diameter of the duplex, so it is unavoidable that a large force is required when inserting the tube.

The present invention provides a gripping mechanism in the joint body or inside the cap nut, so that only two parts are required to perform complete knoll and gripping functions.

This will be explained using drawings.

'ff-[1J]) is the tube 2) is the fitting body 3
) is a sleeve having a band-shaped knoll 4), 5) is a bulge of the sleeve, 6) is a protrusion provided on the top of the sleeve, 8) is a cap nut, and 9) is a tapered portion of the sleeve.

Before inserting l) into 2), fit the sleeve of 3) into 2) and integrate it. This is done by molding 3) first, and then cooling 2] immediately after molding. When it is not in place, press 3) using a simple press. The four parts 5A) of 2) corresponding to the bulging part of 5) expand in diameter to receive 5), and return to their original state immediately after receiving. This is T
Elastic memory capacity (E
This is due to plastic memory.

Thus, when inserting 1) into the integrated invention, the beam first passes through 8) and then passes through the convex portion of 6). Since the inner diameter of 6) is approximately equal to the outer diameter of 1), it passes through this and expands the inner diameter of the annular knoll zone of 4) to reach the bottom 2A) of 2). Next, tighten the cap nut 8) by rotating it.At this time, the outer periphery of 6) is compressed inward by the taper part of 9).Since 6) is divided into multiple pieces up to the line 7), This diameter reduction is easy, and the inner edge of 6) presses the corresponding part of 1), and 1) bulges inward as shown in IA). However, the state after this division is shown in Figure 4. In this way, a strong grip is achieved.

Figure 2 shows an example of applying the present invention to a thick pipe.
), and is provided inside the nut in 8), and by tightening the nut, the tip of 10) is reduced in diameter in correspondence with the upper inner taper part II) in 3), and the diameter of the tip in 10) is reduced to correspond to the outer diameter in 1). Shallow groove IB pre-grooved in
), grip 1) firmly,
Prevent this from escaping. Although not shown in the drawings, the method shown in FIG. 1 is also carried out in the same manner using groove cutting. Furthermore, it is US-PATENT No.
, 3,977.708, but in this case, the ferrule has a thin tapered tip and is not divided in the shape shown in 4) of the present invention. In order to have a knoll and a pull-out prevention function by suppressing deformation in the groove part, it is not possible to increase the wall thickness of this part, and as in the case of the uninvention, large pull-out resistance cannot be expected. A reliable knoll is not possible unless it is performed strictly at right angles to the axis of the In the present invention, the knob and the grip each function independently, so there is no such defect.

Figure 3 shows an example in which the present invention is used in an expansion joint (numbers are the same), and in this case, a grip mechanism is not required. This corresponds to Figure 4 of the prior application, where a socket with a taper of 12) and a slightly larger outer diameter than 1) is attached to the tip of I) with a screw, and when it is retracted from ■), The outer edge 12A) of this collides with the lower surface of a disk 13) sandwiched between 3) and 2) and serving as a stopper whose inner diameter is slightly larger than that of 1), thereby restricting the retreat. However, this expansion joint is an example in which a part of the present invention is applied to a prior application.

Finally, as stated above, the present invention has succeeded in simplifying the mechanism of the prior application, further improving the grip function, reducing the number of parts, greatly improving workability during implementation, and further reducing manufacturing costs. This will make a major contribution to industry.

Example (A), PFA joint with the structure shown in Figure 1 6) Height of protrusion 1.0 mm Width 1.5 mm 8-divided tube Outer diameter 12
．． 7mm, wall thickness: 1.6mm, made of PFA, pull-out resistance at 23°C: 54Kg (b), TFE joint with the structure shown in Figure 2
10) Convex height: 1.0mm, width: 2mm, 8-part pipe T
FE 3/4 inch Wall thickness: 2.87mm Pulling resistance at 23°C: 168Kg (c), Same as the dimensions of the protruding stripes in TFE fatter with the structure shown in Figure 1 6) (b), Pulling resistance at 23°C 1
72Kg

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the present invention when it is put into practice, with the upper half showing the completed state and the lower half showing the state before joining. Figure 2 is a partial longitudinal cross-sectional view of the thick inner pipes being joined. The third figure is a partially cutaway view of the grip part. FIG. 4 shows a part of a longitudinal cross-sectional view of the expansion joint. 1.4 Parts Display 1986 Patent Application No. 195-84
No. 1, 2, Title of the invention: Sealed joint structure (corrected today) 3,
Person making the amendment: 1yI section with 19 cases Applicant name: Jun Takashi Name: Mitsui & Co., Ltd. 4 Agent address: 5-029-7-6, Shinbashi, Minato-ku, Tokyo, subject of amendment Akira! 8 divination (full text), drawings (all [, 4) 7, contents of amendment as attached 8, attachment 11: Category (1) 1 page for correction, l; 1 copy (2
) Correction [page 7 1 details damage (+06-P) 1,
Name of the invention Sealed joint structure 2, Claims (1) An annular joint body that connects pipe bodies fitted at both ends, a sleeve body interposed between the pipe body and the annular joint body, and this sleeve. a nut body for closely fitting the body to the tube body, and a part of the retainer of the tube body to be fitted is provided on the inner peripheral surface of the annular integral body, and the inner circumference of the sleeve body A band-shaped seal portion is formed on the surface of the sleeve body, which is expanded by the tube body and protrudes in the radial direction, and is attached to the outer circumferential surface of the tube body. 1 (forms a protrusion that fits into the 4 parts and is pressed in the radial direction, and is composed of the end of the sleeve body and a nut body. The clip is made of fluorine vA resin and J-1 joint is characterized by having f stages of the clip. It is made of a fluororesin according to claim 1, characterized in that it has a convex strip formed on the inner peripheral surface of the end, and a plurality of slits formed over the entire circumference of the end. Sealed joint structure. (3) The clip-L stage is made of a fluororesin according to claim 1, characterized in that the clip-L stage is constituted by a plurality of protrusions formed on the entire circumference of the inner surface of the end portion of the nut body. 3. Invention 1; General explanation [Industrial application field] This product is made of tetrafluoroethylene resin (TFE),
1ffl is used for the sealing joint structure of tubular bodies such as pipes and tubes made of fluororesin such as J (integration of tetrafluoroethylene and perfluoroalkyl vinyl needle (I'FA)).
It is something to do. [Prior art and its problems] Currently [1] The use of high-temperature, high-pressure fluids is essential in various industrial fields, and these fluids are distributed through pipelines. Particularly in the semiconductor industry, where powerful fluids are used at high temperatures and high pressures, complete sealing of joints in pipelines is of paramount importance9. Various techniques have been proposed for this purpose. For example, in Norwegian Patent No. 93389, it is essential to select the optimum hardness difference between the plastic tube and the hard toothed metal sleeve by fitting a toothed metal sleeve onto the surface of a soft plastic tube. It is difficult to choose which conditions should be met, and in reality, it is not easy to prevent fluid leakage. Also, France Special, 3'1: No. 120715 t r>
In this case, a sleeve made of a soft thermoplastic resin such as polyethylene with tongue pieces 41 at both ends is fitted to the joint of the two tubes, and the center part of this sleeve is fixed to the joint of the same tube by known means. It has a tight structure. However, because the tongues are in light contact with the tube surface without expanding in the axial direction, there is no pull-out resistance, and the pressing force of the sleeve is sufficient to completely seal the high-temperature and high-pressure fluid. There is no way that i+f can be done. Currently, when using 9 drug fluids under high temperature and high pressure, pipelines and their joints are made of fluororesin. Specifically, polytetrafluoroethylene resin (TFE), tetrafluoroethylene and hexafluoropropylene copolymer resin (FIP), tetrafluoroethylene and perfluorovinylether copolymer resin (P
Fluororesins such as F8) are most commonly used. The plastic joint disclosed in U.S. Pat. No. 3,977,708 is a hermetic joint made of fluoroplastic. This requires a nut with a circular wedge-shaped ferrule on the outer surface of the tube having an inner diameter between the outer diameter of the tube and the inner diameter of the tube.
7, the ferrule is in contact with the tube surface and extends in the axial direction. Then, this nut is screwed so that it engages with the other threaded cylindrical body.
: The structure is such that the ferrule is pressed against the tube surface and sealed by engaging and locking the d4 member. The drawback of this technology is that since the ferrule has both the sealing and the pull-out prevention functions, it requires a glue pin that is perfectly perpendicular to the axis of the tube, and this requires extremely high accuracy. It's hard to predict. This causes liquid leakage, and it is especially dangerous to use pipes and tubes with large diameters. As is clear from the above description, in the conventional joint structure, it is extremely difficult to achieve a complete seal at the joint, especially when a powerful fluid under high temperature and pressure is passed through the pipeline. [Summary of the Invention] The present invention provides an annular joint body that is inserted into both ends of a tubular body to connect the tubular body, a sleeve body that is interposed between the tubular body and the annular joint body, and a sleeve body that is connected to the tubular body. It consists of a nut body for heavy attachment. A part of the stopper of the tube to be fitted is provided on the inner circumferential surface of the annular joint body. In addition, on the inner peripheral surface of the sleeve body, a band-shaped seal portion is formed that is expanded by the tube body, protrudes in the radial direction, and tightly seals on the outer peripheral surface of the tube body. A protrusion is provided which fits into a groove formed on the inner peripheral surface of the body and is pressed in the radial direction. Further, the fastening portion formed by the end of the sleeve body and the nut body is provided with gripping means for fixing the tube body to the annular joint body. With the above configuration, this invention has excellent leak resistance against high temperature and high pressure deleterious fluids, and has a strong lip force against the pipe body which is a joint body, especially a vibrator with a thickness of -f. The present invention aims to provide a sealed joint structure with a small number of parts. [A] shows an embodiment of the invention. [In A, l is an annular joint body made of fluororesin, and a stopper part 1 of the pipe body to be fitted is inserted into the center part of the inner surface of the annular joint body.
It protrudes all around the circumference. lb is a groove portion formed over the entire circumference inside near the upper and lower ends of the annular joint body l, into which a protrusion 2b of the sleeve body 2, which will be described later, is fitted. Furthermore, a threaded groove is formed on the outer surface of the annular joint body 1, into which a nut body 3, which will be described later, is screwed. Reference numeral 2 denotes a sleeve body made of fluororesin that is interposed between the ζ-shaped joint body l and the tube body 4 fitted therein, and the central part of the inner surface has a band-shaped seal part 2a with a fin-shaped cross section. It is formed all around. 2b is a protrusion formed over the entire circumference of the central portion of the outer surface, and is adapted to tightly fit into the groove ib in the annular joint body 1 described above. Reference numeral 2c indicates a convex strip formed all around the inside of the end of the sleeve body 2, and reference numeral 2d indicates a plurality of slits formed at the end.The diameter of the opening of the sleeve body 2 can be expanded or contracted by the slits 2d. This makes it easier to insert and fasten the tube body 4. Reference numeral 3 denotes a nut body to be screwed into the annular joint body 1, and an opening having a diameter slightly larger than the diameter of the sleeve body 2 described above is formed in the terminal end surface. A taper 1 part 3a whose diameter expands inward is formed on the inner circumferential surface of the opening 1 part.
The W66 portion of the tube body 4 is constituted by the cylindrical member 4, and the said striped portion 2c of the sleeve body 2 constitutes a grip means for the tube body 4 at this fastening portion. Next, at the second tA), (then the i!I! of the tubes 4, 4!
The related configuration in Ayutoki will be explained. First, circular! ! Sleeve body 2 from both end openings of r body l.
Insert 2. At this time, the protrusion 2b of the sleeve body 2 fits into the groove of the annular dormer body l. Next, the tube body 4 into which the nut body 3 is loosely fitted.
4 is inserted into the opening of the sleeve bodies 2, 2 until the tip of the tube body 4 comes into contact with the stopper portion 1a of the annular group-r body l. The opening [1] of the sleeve body 2 when the Ti is an adult is enlarged in diameter due to the presence of the slit 2d, so that the tube body 4 can be inserted smoothly. The ring-shaped seal portion on the inner surface is expanded in diameter by the tube body 4 and comes into close contact with the outer peripheral surface of the tube body 4.Next, the nut body 3, which is fitted into the tube body 4, is fitted into the annular joint r. As the nut body 3 screws forward, the tapered portion 3a of the nut body 3 comes into contact with the end of the sleeve body 2 and presses it toward the tube body 4.The end of the sleeve body 2 Since a plurality of slits 2d are formed over the entire circumference of the sleeve 2 as described above, the diameter of the opening of the sleeve 2 is reduced as a whole.
The tube body 4 is firmly clipped into the shape of yEI which comes into pressure contact with the outer circumferential surface of the tube body 4 and bites into it. FIG. 3 is a partially cutaway vertical section [A] showing another embodiment of the present invention. In this embodiment, the end portion of the sleeve body 2 and the nut body 3 are constructed. The grip L stage at the fastening portion is provided on the nut body 3. That is, in [;4, 3b is a protruding piece 3c as a first stage of clip r provided on the inner edge of the first part 3c in a twisting and recursive manner over the entire circumference between the outer surfaces of the nut body 3. is press-fitted between the outer surface of the tube body 4 and the inner surface of the sleeve body 2 as the nut body 3 spirals, and as a result, the tube body 4 is firmly clipped. This is effective when the tube body 4 is relatively thick.
In this embodiment, the end portion of the sleeve body 2 and the
) The L stage of the clip is not sunk in any of the three cases. This embodiment is adapted to a tube 4 that expands and contracts depending on the fluid temperature, and the other construction is basically the same as the previous embodiment. [Effects of the Invention] As explained above, the present invention has the effect that the pipe bodies can be connected to each other with a high degree of sealing and a strength of 1 to 4 with a simple structure. 4. Brief description of the drawings 1. [A is an exploded perspective view showing one embodiment of the sealed joint according to the present invention [21. Figure 2 is a vertical view showing a connecting shape E of pipe bodies by the same sealed joint. mi UA, Figure 3,
FIG. 4 is a partially cutaway vertical cross-sectional view showing the third embodiment. l ... ... Annular joint body 2 ... ... Sleeve body 2a ... ... Band-shaped seal portion 3 ... ... Nut body 4 ... ... Pipe body

Claims (1)

[Claims] A band-shaped seal portion that protrudes radially from the inner wall surface of the annular joint body, has its inner diameter expanded by the to-be-joined body which is an annular body or a cylindrical body, and comes into close contact with the entire outer peripheral surface of the to-be-joined body. In the sealed joint structure, a part of the outer diameter of the sleeve having the band-shaped seal part is bulged and integrated into the joint body, and the top part of the sleeve has a protrusion on the top. An annular cylinder having a strip and divided into a plurality of pieces is provided, and the diameter of the first protrusion is reduced by rotating a cap nut to firmly grip the outer periphery of the object to be connected. A cylinder divided into a plurality of parts is provided on the inner surface of the cap nut, and the top of the sleeve is tapered, and when combined with this, by rotating the cap nut, the outer periphery of the object to be connected can be A resin joint structure that features strong grip.