JPS6040890A - Insulating pipe joint - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulated pipe joint that connects pipes while electrically insulating them from each other.

Various types of insulated pipe fittings have been developed and used in the past, but all of these have been made by directly screwing or directly welding the pipe into the insulated pipe fitting, so it is difficult to use for buried pipes, etc. had the disadvantage of very poor workability.

On the other hand, the Gas Business Law stipulates the technical standards for gas facilities in the Ministerial Ordinance Regulations K, I, and Q (MITSU No. 439), which stipulates the technical standards for gas facilities at 4 Kgt.
Article 86 (D
Although the mechanical bonding methods shown in Figures (0) to (U) in section ) are listed, none of these had an insulating function.

The present invention was made in view of these circumstances, and its purpose is to eliminate the conventional welding and screwing methods of joining insulated pipe fittings and pipes, which have poor workability, and to improve workability. It is an object of the present invention to provide an insulating pipe joint that can have good properties, can be joined in accordance with the mechanical joining method specified in the VA notification, and can also be provided with an insulating function.

In order to achieve this object, the present invention provides a joint body which is disposed in an external fitting manner between the ends of the pipes to be connected, and an inner peripheral surface of the joint body and the outer periphery of the end of the pipe to be connected. an insulator disposed between the surfaces or between the opposing surfaces of the ends of the pipes to be connected to insulate the joint body and the pipes or the pipes to be connected; and a screw threaded to the open end of the joint body. a tightening mechanism that joins the joint body and the pipe by fitting, the tightening mechanism has a threaded portion that is screwed into the open end of the MiJ joint body, and has a 1jq end-inner solid surface. An annular stop having a tapered surface that gradually becomes larger in inner diameter, and an inclined surface that abuts the tapered surface of the stop on its outer circumferential surface, and an inner periphery of the stop at the rear end of the inclined surface. It is also an annular insulating lock spacer having a protrusion interposed between the surface and the outer peripheral surface of the tube, and further having a groove formed in the axial direction in the main body portion on which the sloped surface is formed. 1.

An embodiment of the present invention will be described below with reference to FIGS. 10 and 2.

In FIG. 1, 1 and 1 are the pipes to be connected, and 2 is the pipe 1.
．． a cylindrical joint body disposed in an external fitting manner between the ends of 1;
is a plastic (FRP), nylon, or insulating synthetic resin (for example, glass fiber base fabric impregnated with epoxy resin) disposed between the inner peripheral surface of the joint body 2 and the outer surface of the end of the pipes 1, 1. A ring-shaped insulator made of
Both sides thereof are tapered surfaces 3a that are gradually inclined inward.
. It is arranged between opposing surfaces to prevent contact between the end surfaces of the tubes 1 and 1 and to provide insulation.

Also, 4.4 is a rubber (NIIR) seal ring,
Tapered surfaces 4a, 4a are formed at the tip of the insulator 3, and these tapered surfaces 4a, 4a are connected to the tapered surface 3 of the insulator 3.
By entering the taper into a and 3a and colliding with each other,
The sealing performance between the outer peripheral surfaces of the tubes 1, 1 of the seal ring 4.4 and the tapered surfaces 3a, 3a of the insulator 3 is improved.

Further, reference numerals 5 and 5 designate annular rings that are in contact with the rear end surfaces of the seal rings 4, 4.

Furthermore, reference numerals 6, 6 are tightening mechanisms that fix the joint body 2 and the pipe 1.1.

The tightening mechanisms 6, 6 include a male threaded portion 7a screwed into the female threaded portion 2a, 2a on the inner surface of the open end of the joint body 2;
7a on the outer circumferential surface, and tapered surfaces 7b, 7b having a gradually larger inner diameter on the inner circumferential surface of the front end.
The stoppers 7, 7 and the tapered surfaces 7b, 7 of the stoppers 7, 7
b [It has abutting inclined surfaces 8a, 8a on the outer peripheral surface, and a 1jfJ mark stopper 7 is provided at the rear end of the inclined surfaces 8a, 8a.
．． Extending portions 8b, 8b are interposed between the inner peripheral surface of the tube 7 and the outer peripheral surface of the tubes 1, 1, and the inclined surface 8a,
8g is formed on the main body portion 8c.

It consists of annular insulating lock spacers 8, 8 made of nylon or the like, as shown in FIG. 2, in which dividing grooves 8d are formed at four locations in the direction of the aCK axis.

The joint body 2 and the pipe l by the tightening mechanism 6,6.

1, first insert the insulating lock spacer 8゜8 into the sock 7 wires 5, 5, then attach the fasteners 7, 7 to the male threaded parts 7a, 7a of the joint body 2. This is done by threading the insulating lock spacer 8.8 onto the tapered surfaces 7b, 7b of the insulating lock spacer 8.8 to a desired position on the inclined surfaces 8a, 8aVC of the insulating lock spacer 8.8. In this case, the main body portions 8c, 8cVt on which the inclined surfaces 8a, 8a of the insulating lotta spacers 8, 8 are formed.
- Is it a stop because the split groove 8d... is formed with a spring? , 7's tapered surfaces '71), 7b are connected to the insulating lock spacers 8, 8's tapered surfaces 811, 8. When the taper penetrates into the positive direction, the main body portion 8c of the insulating lock spacer 8,
, 8c is reduced in diameter to form tube l.

Therefore, the pipes 1.1 are restricted from being pulled out outward from the joint body 2, and the pipe 1.1 and the joint body 2 are in a joined state.

Note that when the stoppers 7, 7 are tapered into the insulating lock spacers 8, 8, the washer 5, 5 is pressed by the stopper 7.7 against the insulating lock spacers 8, 8
Since the sole rings 4, 4 disposed between and the insulator 3 are strongly compressed, the compression of the sole rings 4, 4 causes the insulator 3 to come into close contact with the outer peripheral surface of the tubes 1, 1. Due to the close contact with the tapers IJj 3a, 3a, the fluid inside the pipe L1 is reliably sealed, and there is no leakage to the outside.

Therefore, with such a configuration, when joining the joint body 2 and the pipes 1, 1, the insulation lock space -+)--
8, 8 into the washer 5, 5 side, then the stopper 7
, 7, while screwing the male threaded portions 7a, 7a into the female threaded portions 2a, 2a of the joint body 2, and taperly enter the insulating lock spacer 8°8. The joining work is extremely easy, and even when applied to buried pipes, the joining work can be performed very easily and quickly.

Moreover, without forming any threaded part on the pipe 1.1 itself, the joint body 2 and the pipes 1, 1 are connected by the tightening machine Flf6.6.
Since it has a structure in which the seal rings 4, 4 are pressed and compressed to seal the fluid in the pipes 1, 1, the machine according to the notification of Tsusan No. 439 mentioned at the beginning This results in a bonded state in accordance with the standard bonding method, and provides very good sealing of the fluid within the tube 1.1, making it possible to fully satisfy reliability.

Furthermore, the tightening mechanism 6, 6 has an externally threaded portion 7a of its stop 7.7, ? a to the female threaded portion 2a of the joint body 2, 2a
When screwed in, the insulating lock spacer 8, which is inserted into the joint body 2 by the taper penetration of the stopper 7.
8 is reduced in diameter, and the insulating lock spacers 8, 8 are pipes]
.

The extending portions 8b, 8t formed on the insulating lock spacers 8, 8 hold the outer peripheral surface of the stopper 7.
, 7 and the outer circumferential surfaces of the tubes 1, 1, the current flowing from one tube 1 to the other tube 1 through the stopper 7 or the joint body 2 will also be the same as described above. It will be reliably insulated by the insulation lonota spacers 8, 8,
As a result, this tightening machine @6,6 does not satisfy the mechanical joining method according to the above-mentioned notification of Japanese Union No. 439, and can also have an insulating function.

Note that the present invention is not limited to the above embodiments,
It goes without saying that the present invention can also be applied to, for example, those shown in FIGS. 3 to 7. In addition, in the explanation of the embodiment shown in FIGS. 3 to 7, only the parts that are different from the previous embodiment will be explained, and the same structure as that of the previous embodiment will be explained. The same reference numerals are used in the drawings to omit the explanation.

The insulated pipe joint shown in FIG.
An insulating coating layer 13 made of fluorocarbon resin, plastic, etc. is applied to the inner circumferential surface, tip surface, and outer circumferential surface of the joint end 11a of the left joint body 11. An FRP insulating cap]-4 is provided, and the insulating coating layer 13 and the insulating camp 14 are used to connect the joint body 10 to the pipe 1.1 or the pipes 1, 1 to be connected.
The left and right joint bodies 11 and 12 are joined to the joint end 11a of the left joint body 11 and the joint end of the right joint body 2], 2
This is done by putting the part a over the outside fitting method, and in this state, tightening the joint end 12a of the right joint main body 12 in the circumferential direction. Note that 15 is an O-ring that seals between the joint ends 11a and 12a of the left and right joint bodies 11 and 12. In this way, the insulation properties between the tubes 1, 1 can be achieved without the need for the insulating rotary spacers 8, 8 to have insulation properties.
By making the insulating lock spacers 8:8 have insulating properties, it is possible to further enhance the insulating effect and improve reliability.

In addition, the insulated pipe joint shown in FIG. 4 has a cylindrical joint body 20.
A recess 21 having a concave cross-section is formed in the center of the inner peripheral surface of the joint body 20, and an insulating coating layer 22 made of fluorine resin, plastic, etc. is applied to the inner peripheral surface of the joint body 20, including the inner surface of the recess 21. The split type insulating ring 23 is fitted and fixed in the recessed part 21 having the insulating coating layer 22 formed on the inner surface thereof, and the split type insulating ring 23 is disposed between the opposite ends of the tubes 1, 1. These insulation w1. Covering layer 22
The insulator 3 is made up of the split type insulating ring 23 and the split type insulating ring 23.

The insulated pipe joint shown in FIG. 5 has a protrusion 24b formed at one place on the outer peripheral surface of the split type insulator 3 having the split groove 24a. A recess 2b formed in the center of the inner circumferential surface of the recess 2b (inserted and fixed therein) facilitates the installation of the insulator 3 into the joint body 2 and prevents the insulator 3 from shifting.

In addition, the insulated pipe joint shown in FIG. 6 is obtained by replacing the insulation cap 14 of the insulator 3 of the insulated pipe joint shown in FIG. 3 with the split-type insulating pipe 23 shown in FIG. However, in addition, there is a protrusion 7 at the tip of the stoppers 7, 7.
c, 7c are integrally formed, and the protruding portions 7c, 7c
In this way, the pressing force of the stopper is applied directly to the seal rings 4, 4. This compresses the seal rings 4, 4 more effectively and improves the degree of sealing of the fluid in the pipes 1, 1. There is. Note that such a stopper 7.7 has a protrusion 7c.
, 7c are integrally formed and the pressing force of the stoppers 7, 7 is applied directly to the sole ring 4.4, of course, not only in this embodiment but also in FIG. The present invention can also be applied to the embodiment described in FIG. 5 and the embodiment shown in FIG. 7, which will be described later.

In addition, the insulated pipe joint shown in Fig. 7 is also applicable to
Insulating cap 1 of insulator 3 of the insulating pipe joint shown in the figure
4 is replaced with a split type insulating ring 23 shown in FIG.
, 80 Main body portions 8c, 8c have recessed portions 81e with concave cross-sections on the inward facing surfaces.

8e, and the inner periphery of the recesses 8e and 8aK is fitted with a split metal ring 25.25 having a saw blade shape, thereby increasing the frictional resistance with the outer peripheral surface of the tubes 1, 1, making it even more effective. Specifically, the pipes 1, 1 are prevented from being pulled out outwardly. It should be noted that such a configuration for preventing removal is, of course, applicable not only to the present embodiment but also to the embodiments described above with reference to FIGS. 1 to 6.

As can be easily understood from the above description, the insulated pipe joint of the present invention includes a joint body disposed in an external fitting method between the ends of pipes to be connected, an inner circumferential surface of the joint body, and a joint body disposed between the ends of pipes to be connected. An insulator disposed between the outer peripheral surface of the end of the pipe to be connected or between the opposing face of the end of the pipe to be connected and insulating the joint body and the pipe or the pipes to be connected; A tightening mechanism that connects the joint body and the pipe by screwing into the open end of the joint body, the tightening mechanism having a threaded portion screwing into the open end of the four joint bodies. , and has an annular stop having a taper that gradually becomes larger in inner diameter on the inner circumferential surface of the front end, and an inclined surface on the outer circumferential surface that abuts against the taper of the stop, and the rear end of the inclined surface. an annular shape having an extending portion interposed between the inner circumferential surface of the stopper and the outer circumferential surface of the tube, and further having a groove formed in the axial direction in the main body 1111 on which the inclined surface is formed; By constructing the pipe with an insulating spacer, it is possible to eliminate the conventional welding and screwing methods of joining the insulated pipe joint and the pipe, which have poor workability. Tsusan No. 439
Since it can be joined according to the mechanical joining method according to the notification of No. 439, the fluid sealing force at the joint can be improved and reliability can be obtained. Its effectiveness and practicality, such as being able to provide insulation functions, are extremely impressive.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a sectional view showing the upper half of the insulating pipe joint, FIG. 2 is a perspective view of the insulating lock spacer, and FIGS. 3 to 7 show other embodiments of the present invention. 3 to 7 are cross-sectional views showing the upper half of the insulated pipe joint. 1... Pipe, 2.10.20... Joint body, 3...
Insulator, 6... Tightening mechanism, 7... Stopper, 7a...
・Threaded part of the stopper, 7b...Taper of the stopper, 8・
・Insulation lock spacer, 8a...Insulation lock 7,
Inclined surface of hesser, 8b... Extending portion of insulation lock spacer, 8c... Main body of insulation lock spacer, 8
d...Divide groove of insulation lock spacer. Patent applicant: Nippon Pillae Gyo Co., Ltd. Representative Patent attorney: Takashi Meie 1. Indication of the case: Japanese Patent Application No. 150589/1989 2. Name of the invention: Insulated pipe joint 3. Relationship with the person making the amendment: Patent applicant: Hiki Pillar Industry Co., Ltd. 4, Agent 5, Date of amendment order (1) The text 1-Diagram-1 at the beginning of page 4, line 6 of the specification was changed to "Diagram (a), (b)" ” and correct it. (2) In page 4, line 11, line 1 to line 13 of the specification, the statement ``made of plastic (FRP), etc.'' is corrected to ``made of insulating synthetic resin.'' (3) Page 6, line 5, I:l of the specification ``Made of nylon as shown in Figure 2'' was replaced with ``Made of nylon, polyacetylene, or other FRP as shown in Figure 2 (A)'' (4) In the 7th line of page 6 of the Meiwa 1 invitation, the phrase ``Mono desu.'' was replaced with ``Mono desu. Even if these insulating lock spacers 8, 8 have a 170-split shape with a slot 8d' parallel to the axial direction as shown in the second figure, sufficient IP and performance can be obtained. (5) Page 10, line 2 of the IJ specification “1st to 3rd tr.
In III, the phrase ``or with insulation made of plastic, etc.'' is replaced with ``insulation made of lining or coating of other plastic, etc.''
3." (6) j'-F RP on page 10, line 4 of the specification
Correct "j" to "plastic". (7) The phrase "plastic" in lines 5 and 6 on page 11 of the specification is amended to read "other synthetic resins." (8) Insert the following statement between page 13, line 10 and line 11 of the specification. [Also, FIGS. 8(A) to 8(E) show various examples of shapes of the split metal ring 25.25 explained in FIG. Divided metal ring 25.
25 without forming a saw blade, the inner peripheral surface 25a
In (b), a plurality of notches 25b are provided on the inner circumferential surface 25a so that a local load is applied to the outer circumferential surface of the tubes 1, 1. In the case of the embodiment (b), an anti-corrosion coating layer is formed on the outer peripheral surface of the tubes 1, 1, and when this anti-corrosion coating layer is thick, the pull-out resistance of the tubes 1, 1 is increased. effective. In addition, (c) to 01 show examples of longitudinal cross-sectional shapes of the split metal rings 25, 25, and the inner circumference of the split metal ring 25.25 is as follows. Surface 25
a, 25a increases the frictional resistance between the outer peripheral surfaces of the tubes 1, 1, and effectively prevents the tubes 1, 1 from being pulled out outward. The inner peripheral surface shapes of these (c) to (e) are similar to the split metal ring 2 of (b) above.
This can be applied to the split metal rings 25 of No. 5 and (b), respectively. (9) Brief explanation of the drawings in the specification (15th in 1 month)
In the second line of the page, replace “Figure 2 is” with “Figure 2 (A)”.
, (b) is corrected. (10) In the brief description column of the same drawing, the text "Figure 7" in the third line of page 15 has been corrected to "Figure 8." (11) In the column for a brief explanation of the same drawing, on page 15, line 5, the phrase "This is a cross-sectional view." was replaced with "This is a cross-sectional view. FIGS. 8(c) to 8C-1 are respectively longitudinal sectional views of the split metal ring." (12) Of the drawings attached to the specification, Figures 2(a) and 8th
Add a diagram. Above Figure 2 (a) Figure 8

Claims (1)

[Claims] A joint body disposed to fit between the ends of the pipes to be connected, and a gap between the inner peripheral surface of the joint body and the outer peripheral surface of the end of the pipe to be connected or the end of the pipe to be connected. an insulator disposed between opposing surfaces of the joint body to insulate the joint body and the pipe or the pipes to be connected; and a tightening mechanism that joins the joint body and the pipe by screwing into the open end of the joint body. The tightening mechanism includes: an annular stopper having a threaded portion that is threaded into the open end of the joint body and tapered to a gradually larger inner diameter on the inner circumferential surface of the front end; an extending portion having an inclined surface on its outer circumferential surface that abuts against the taper of the stopper, and interposed at the rear end of the inclined surface between the inward surface of the upper fitting and the outer circumferential surface of the pipe; What is claimed is: 1. An insulated pipe joint comprising: an annular insulating rotor spacer in which a groove is formed in the axial direction in a main body portion on which a bevel is formed;