WO2004109174A1

WO2004109174A1 - Pipe joint

Info

Publication number: WO2004109174A1
Application number: PCT/JP2004/007533
Authority: WO
Inventors: Mitsuyoshi Tomiki
Original assignee: Toki Engineering Co., Ltd.
Priority date: 2003-05-26
Filing date: 2004-05-26
Publication date: 2004-12-16

Abstract

In a pipe joint, flanges (2, 2) are arranged on outer peripheries of facing edges (1’, 1’) of two pipes (1, 1) placed on a common axis (c), and a tapered surface (3) along inner peripheral circles of the facing edges (1’, 1’) and a square edge (4) that is in contact with the tapered surface (3) along the inner peripheral circles are formed. The pipe joint has pressure contact means for bringing the tapered surface (3) and the square edge (4) into pressure contact with each other in a circular shape and tightly sealing the facing edges along the circular pressure contact line. The tapered surface (3) or the square edge (4) is formed in a projected or recessed form on either of the facing edges.

Description

Description '' Pipe Fittings Technical Field

The present invention relates to a pipe joint for a fluid transport pipe. Background art

Conventionally, pipe joints of high-pressure fluid transport pipes are tightened with an annular groove-shaped tightening band that can open and close the opposite flanges that share the center line, and packing is interposed between the opposed surfaces of the opposed flanges to prevent fluid leakage ( Figure 15 (a) (b) diagram).

However, the packing was aged and easily crumbled and protruded into the pipes, shifted from a predetermined position, protruded and aged and separated into the fluid food, contaminating the food fluid and significantly deteriorating the quality of the final food.

Also, in the packingless joint, there is a problem that the transport fluid food easily leaks to the outside due to the internal pressure and leaks from the joint.

Therefore, an invention was made to improve the airtightness by contacting the tapered surfaces with each other at the joint portion and pressing with a screw. Such an invention is disclosed in, for example, Japanese Utility Model Publication No. 3-15897, column 4, description column 4, lines 30 to 32 of the specification, and Japanese Patent Application Laid-Open No. H11-230436. The disclosure is made as a purge boat 3 of paragraph number "004 1" and packings 17A and 17C of "0054".

However, because of the interposition of packing, deformation leakage due to aging was unavoidable, and the powering mechanism became complicated. Disclosure of the invention

An object of the present invention is not to use packing at a joint portion of two pipes, but an object of the present invention is to precisely seal by tightening an annular band between a tapered surface and a ridge line of a corner edge at opposite ends of flange portions of both pipes.

In order to achieve the above object, the pipe joint according to the present invention is arranged on a common center line. A flange is provided on the outer periphery of the opposed end of each of the two tubes, and a tapered surface is formed along the inner peripheral circle of the opposed end, and a corner edge in contact with the tapered surface is formed along the inner peripheral circle. A crimping means for crimping the outer surface and the corner edge in a circumferential shape and sealing the opposing end along a circumferential crimping line; BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a longitudinal sectional view showing a pipe joint of the present invention,

Fig. 2 is a longitudinal sectional view with the tightening band attached.

Figure 3 is a front view with the tightening band attached,

Fig. 4 is a front view of the flange tightened by the tightening band.

Fig. 5 (a) is an enlarged vertical sectional view of the joint part of both pipes with different inner diameters, Fig. 5 (b) is a vertical sectional view of the band tightened state of Fig. 1 (a),

Fig. 6 (a) is an enlarged vertical sectional view of the joint part of the same inner diameter pipe, Fig. 6 (b) is a vertical sectional view of the band tightened state of Fig. 6 (a),

Fig. 7 (a) is an enlarged vertical cross-sectional view of the arrangement of the corner edge and the tapered surface, and Fig. 7 (b) is a vertical cross-sectional view of the joint with both pipes having the same thickness.

FIG. 8 is a longitudinal sectional view showing the pipe joint of the present invention,

9 (a) is a partially enlarged side view of FIG. 8, FIG. 9 (b) is a partially enlarged side view of another embodiment of FIG. 9 (a),

FIG. 10 (a) is a partially enlarged side view of FIG. 8 showing another example of the annular opposed groove, and FIG. 10 (b) is a partially enlarged side view of another example of FIG. 10 (a). ,

Fig. 11 (a) is an enlarged vertical cross-sectional side view of the sealed state due to precision mechanical error between the annular projection and the annular opposing groove, and Fig. 11 (b) is an enlarged vertical section of another embodiment of Fig. 11 (a). FIG. 12 is a partially longitudinal side view of another embodiment of the present invention,

Fig. 13 is a partial longitudinal section without the short pipe,

Fig. 14 (a) is a longitudinal cross-sectional view of the pipe joint in a state in which the flange is crimped by the tightening nut. Fig. 14 (b) is a partially enlarged view of Fig. 14 (a).

Fig. 15 (a) is a partial longitudinal side view of the spigot face joint, and Fig. 15 (b) is a partial longitudinal cross section of the packing interposed face joint. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The two stainless steel tubes 1, 1 are arranged on a common center line c, and the flanges 2, 2 are respectively formed on the outer periphery of the opposed ends 1 ′, 1 of both tubes 1, 1 with the opposed ends 1 ′, 1 ′ respectively Provide them together.

The opposing surfaces 2 ', 2' of the flanges 2, 2 are parallel surfaces orthogonal to the center line c, and the back surfaces 2 ", 2" of the flanges 2, 2 are opposite ends of both pipes 1, 1, respectively. Then, it is inclined toward the center line c, and the inclination angle α is the same (see Fig. 5 (a)).

In addition, a tapered surface 3 that is inclined toward the center line c toward the other opposing end 1 ′ is protruded along the inner circumference of one opposing end 1 ′.

Further, a corner edge 4 which is in contact with the tapered surface 3 is formed along the inner circumferential circle of the other opposite end 1 ′.

The inclined groove surfaces 5 ′, 5 ′ of the annular groove-shaped tightening bands 5, 5 (tightening device and crimping means) are in contact with the rear surfaces 2 ″, 2 ″ of the flanges 2, 2, respectively. By tightening in the opposite direction with the fastener 6, the above-mentioned square edge 4 is strongly pressed against the above-mentioned tapered surface 3 and tightly sealed.

As shown in FIGS. 3 and 4, the bands 5 and 5 are formed in a ring shape by pivotally supporting the groove-shaped tightening bands 5 and 5 facing both ends of the connecting rod 5 "by pins 7 and 7. Insert one end of the other band 5 into the openable and closable clamp 6 pivotally supported by a pin 8 at one end of the band 5. Connect the tip 5a (insertion portion) to the upper end of the clamp 6 The thumb screw-shaped head 9 of the screw (porto) 9 screwed into the female screw portion 6 ′ is rotated so that the lower end of the screw 9 makes the above-mentioned tip 5 a the above-mentioned pin at the lower end of the fastener 6. Press towards 8.

The opposing bands 5, 5 are pressed in the opposing direction (vertical direction in FIG. 4) by the pressing, and the inclined groove surfaces 5 ′, 5 of the bands 5, 5 are fitted to the rear surfaces 2 ″, 2 of the flanges 2, 2. Is strongly pressed in the facing direction (direction of the common center line c) and tightened, so that the tapered surface 3 and the edge 4 are pressed in a circumferential shape, and the tapered surface 3 is By tightening in step 4, the inner circumference of the opposed ends la and 1a can be completely sealed (see Figs. 5 (a) (b) and 6 (a) (b)). The tapered surface 3 is formed on the entire outer periphery of an annular portion 1 "integrally projecting from the inner peripheral circle of one of the opposed ends 1 'to the same diameter as the inner diameter d of the tube 1.

A 90-degree intersection circle between the inner peripheral surface 1 a of the other opposite end 1 ′ sharing the center line c and the opposite surface ²⁵ of the flange 2 forms the corner 4, and the corner 4 is annular. Press the entire outer circumference (tapered surface 3) of part 1 "in a direction parallel to the center line c.

Further, the tapered surface 3 can be formed (recessed) along the inner circumferential circle of the other opposing end 1 ′, and the above-mentioned square edge 4 can be formed at the top of the tip of one of the protruding annular portions 1 ″. Yes (see Figures 7 (a) and 7 (b)).

The corner edge 4 of the other opposing end 1 ′ can be formed at the upper edge of the square notch 10 formed along the inner circumference of the other opposing end 1 ′, in which case FIG. As shown in (b), the inner diameter d of the two tubes 1, 1 can be the same, and the thickness of the two tubes 1, 1 can be the same.

Therefore, the inclined grooves 2 of the fastening bands 5, 5 are provided on the inclined back surfaces 2 ", 2" of the flanges 2, 2 provided on the opposed ends 1 ', 1' of the tubes 1, 1 arranged on the common center line c. The flanges 2 and 2 are pressed in the direction of the center line c by interviewing 5 ′ and 5 ′ and tightening the bands 5 and 5 with the fastener 6. By this pressing, the corner edge 4 can be pressed against the tapered surface 3 and tightened.

Since the tip of the edge 4 is a circular ridge line, the ridge line is pressed against the annular tapered surface 3, and the strong circular ridge line of the edge 4 is pressed against the tapered surface 3. . That is, the annular edge 4 forming the inner circumferential circle centered on the center line c is opposed to the opposite end 1 ′, 1 with respect to the ring-shaped tapered surface 3 gently inclined toward the center line c around the center line c. ', The inclined back surfaces 2 ", 2" of the flanges 2, 2 are in contact with the inclined groove surfaces 5, 5, 5' of the fastening bands 5, 5, and the flanges 5, 5 are in contact with each other. The gently inclined surface (tapered surface 3) and the ridged edge 4 are inclined by the tapered surface 3 in order to pack up the pressure contact between the rim 4 and the tapered surface 3 in the direction of the center line c. Adhere so that it can be tightened along.

In other words, unlike the case where the ridge is pressed against the mere upright surface at right angles, the ridge (square edge 4) is pressed against the center line c and the tapered surface 3 that is inclined at a slight angle in the center line direction. Tightens toward the tapered surface 3 and the inclination angle of the tapered surface 3 (see Fig. 5 (a)). The smaller, the greater the tightening phenomenon.

FIGS. 15 (a) and 15 (b) are partial longitudinal sectional views of a conventional pipe joint.

(a) is a spigot-type face-to-face joint, and Fig. 15 (b) is a packing-interposed face-to-face joint. As shown in Fig. 1, 1 1 is a transport pipe, 1 2 is a male threaded part on the other end side of the pipe 1 for screwing the transport pipe, 13 is a female thread holding ring for the transport pipe, and 14 is a transport pipe. Stop flange.

Also, as shown in Fig. 8 and below, an annular opposing groove 15 is formed (recessed) on the opposing surface 2 'of the flanges 2 and 2 so as to share the center line c. The cross-sectional shape of the facing groove 15 is a horizontal U-shape (see FIGS. 8, 9, 9, 11 and 12) or a horizontal U-shape (see FIGS. 10 (a) and (b)). That's enough.

A short inner pipe 17 is fitted into both of the pipes 1 and 1, and an annular disk 18 provided integrally at the center or near one end of the short inner pipe 17 is attached to the opposed surfaces 2,,, of the flanges 2, 2. Insert between 2 '. In this state, the short inner pipe 17 shares the center line c. Further, the disk 18 can be interposed only by the disk 18 without using the short inner tube 17 (see FIG. 13).

Annular projections 19 and 19 are formed (projected) at symmetrical positions on both sides of the annular disk 18 and are formed (concave) on opposed surfaces 2 'and 2' of the flanges 2 and 2 respectively. Provided at positions corresponding to 15 and 15.

As shown in Figs. 11 (a) and (b), the width L of the protrusions 19, 19 is such that the base width L is large, the tip width 1 is small, and the taper from the base end 19 'to the tip 19 "is formed. Surface 3 is symmetrical on the inside and outside of projection 19 (see Fig. 11 (a)) or either inside or outside (Fig. 11

(See (b)).

At the entrance of the annular opposing grooves 15, 15, the tapered surfaces 3, 3 are both inside (on the center line side) and outside corner edges 4, 4 (FIGS. 8, 9 (a) and FIG. 10 (a)), and is formed so as to be pressed against at least one corner edge 4 (see FIGS. 9 (b), 10 (b) and 11 (a) (b)).

Each of the corner edges 4, 4 is a right-angled ridge, and the top is a ridge line. At least one of the tapered surfaces 3, 3 of the protrusion 19 is smaller than the ridges 4, 4. The projections 19, 19 are respectively annularly opposed grooves 15,

Enter within 15 (Fig. 9 (a) (13), Fig. 10 (&)), Fig. 11 (&) (b)).

By the way, the tapered surfaces 3 and 3 of the projections 19 and 19 have a width from the base end 19 'to the end 19 ", that is, 1/2 (L-1) in FIG. 11 (a), and FIG. In (b), (L-1) is the width that can contact the edge 4 and the tapered surface 3 contacts the edge 4 in the range of 1/2 (L-1) or (L-1). In the range of lZ2 (L-1) or (L-1) as shown in Fig. 11 (a) and (b), the precision error (for example, about 1/100 to 200/100 mm) The tapered surface 3 and the edge 4 are pressed against each other, at least one tapered surface 3 and at least one edge 4 are pressed against each other, or both the tapered surfaces 3 and 3 are pressed against both the edges 4 and 4 As a result, the fluid particles in the pipe 1 are blocked and do not leak.

Of course, the tip width 1 of the annular projection 19 is smaller than the bottom width 1 ′ of the annular facing groove 15. As shown in FIGS. 8 to 10, the annular disk 18 is provided on the outer circumference near one end of the short inner pipe 17 fitted to the inner surfaces of the two pipes 1, 1 so that the short inner pipe 1 near the other end is provided. 7 is fitted and held in one tube 1 and the short end of the short inner tube 17 is fitted from the rear end of the other tube 1 so that the annular disc 18 is connected to the flanges 2 and 2. It can be clamped between the facing surfaces 2 ', 2' (Figs. 8 to 10).

The annular opposing grooves 15, 15 may be recessed on the disk 18 side, and the annular projections 19, 19 may protrude on the opposing surfaces 2 ′, 2 ′ of the flanges 2, 2.

As shown in Fig. 3, the annular groove-shaped tightening bands 5, 5 which press against the rear surfaces 2 ", 2" of the flanges 2, 2 respectively are pivotally attached to both ends of the short connecting rod 5 "with pins 7, 7 so as to be freely opened and closed. Then, the lower end of the frame-shaped fastener 6 is pivotally supported on the tip of one of the bands 5 with a pin 8, and the tip 5 a of the other band 5 is inserted into the fastener 6 and tightened. A bolt 9 is screwed into the female screw 6 ′ provided at the upper end of the attachment 6, and the butterfly bolt head 9 ′ is turned, so that the lower end of the bolt 9 connects the tip 5 a of the other band 5. By pressing against the tip of one of the bands 5, the C-shaped inclined grooves 5 ′, 5, 5 in the grooves of the tightening bands 5, 5 are pressed against the rear surfaces 2, 2 ”of the flanges 2, 2. Then, the flanges 2 and 2 are pressed in opposite directions (arrows a and a 'in FIG. 9A).

Due to the above pressing, the inner and outer corner edges of each of the annular facing grooves 15 and 15 or any of them

Each of the annular projections 19, 19 or any one of the tapered surfaces 3, 3 is crimped to 4, 4 so that the flanges 2, 2 are sealed by the compressed annular disk 18. You.

The annular opposing grooves 15 and 15 and the annular protrusions 19 and 19 are precisely machined at the symmetrical positions as shown in Figs. 8 to 10, but the outside shown in Figs. 11 (a) and (b) Even if a non-contact portion t occurs between the tapered surface 3 and the outer edge 4 due to an error of about 1/100 to 2 100 mm, the width of the tapered surface 3 in the inward and outward directions 1 2 (L- 1) (Fig. 1 1 (a)) or (L- 1) (Fig. 11 (b)), the inner tapered surface 3 always contacts the inner corner 4, so the fluid in the tubes 1, 1 is prevented from leaking Is done. In FIG. 11 (a) and (b), reference numeral 16 denotes the bottom of the opposed groove 15.

In addition, the conventional rubber packing 20 shown in FIG. 15 is removed from the annular opposed grooves 15 and 15, and the annular disk 18 is arranged between the opposed grooves 15 and 15. 1 and 19 are inserted into the opposed grooves 15 and 15 as described above, and one or both of the corner edges 4 and 4 are pressed against one or both of the tapered surfaces 3 and 3 to form a pipe 1, Leakage of the fluid in 1 can be prevented.

On the common center line c, a fastening nut 21 can be used in place of the band 5 in the pipe joint.

That is, as shown in FIGS. 14 (a) and 14 (b), the outer diameter of one flange 2 is formed to be slightly larger than the outer diameter of the other flange 2, and the external thread 22 is formed on the outer peripheral surface of one flange 2. The outer peripheral surface of the other flange 2 is formed to be lower than the height of the male screw 22.

The female screw 22 ′ formed on the inner peripheral surface of the annular body 21 ′ is screwed to the male screw 22 by bringing both flanges 2 and 2 close to each other along the common center line c, and the other side of the annular body 21 ′ And a ring 21 "for engaging with the outer peripheral surface of the other flange 2 is integrally provided on the other side of the annular body 21 'to form a tightening nut 21 (a tightening device and a crimping means). The two flanges 2, 2 can be pressed into contact with the corner edge 4 and the tapered surface 3 by screwing the flange 2 to the side.

In this case, it is preferable that the back surfaces 2 ", 2" of the flanges 2, 2 are orthogonal to the common center line. In short, flanges 2 and 2 are provided on the outer periphery of the opposed ends of the two pipes 1 and 1 arranged on the common center line c, respectively, and the tapered surface 3 along the inner circumferential circle of the opposed end is provided. Forming an angular edge 4 that is in contact with the tapered surface 3 along an inner circumferential circle;

The above taper surface 3 and the above-mentioned square edge 4 are crimped in a circumferential shape, and A crimping means for sealing the opposed end, wherein the tapered surface 3 or the corner 4 is projected or recessed at one or the other opposed end,

Alternatively, the tapered surface 3 or the square edge 4 is protruded or recessed on the opposed end and the annular disk 18 interposed between the opposed ends,

The crimping means is a tightening device that slides the flanges 2, 2 in an opposing direction steplessly, such as the annular groove-shaped tightening bands 5, 5 and the tightening nuts 21. As described above, according to the present invention, not only can the flange at the opposite end of the tube be tightened in the opposite direction, but also the other edge can be opposed to the tapered surface formed at one of the opposite ends of the tube. The edge can be strongly clamped to the tapered surface by pressing against the direction (common center line direction) or through the annular disk between the opposing ends, thereby packing leakage of pipe fluid from the joint. Can be prevented without. Industrial applicability

The present invention is particularly applicable to a joint of a pipe for transporting liquid food such as soy sauce and mayonnaise in a food manufacturing plant.

Claims

The scope of the claims

1. A flange is provided on the outer circumference of the opposite end of each of the two tubes arranged on the common center line.

A tapered surface along the inner circumference circle of the opposing end,

Forming an angular edge in contact with the tapered surface along the inner circumferential circle;

A pipe joint comprising crimping means for crimping the tapered surface and the corner edge in a circumferential shape and sealing the opposite end along a circumferential crimping line.

2. The pipe joint according to claim 1, wherein the tapered surface or the edge is projected or recessed at one or the other of the opposed ends.

3. The pipe joint according to claim 1, wherein the tapered surface or the square edge is projected or recessed from the opposed end and an annular disk interposed between the opposed ends.

4. The pipe joint according to any one of claims 1 to 3, wherein the crimping means is a tightening device that slides the flange in the opposing direction steplessly.