JP4157493B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint of a fluid transport pipe.

  Conventionally, pipe joints for high-pressure fluid transport pipes have a counter flange that shares the center line tightened with an openable and closable annular groove-type clamping band, and a packing is interposed between the opposing faces of the counter flange to prevent fluid leakage ( FIG. 15 (a) (b)).

  However, the packing was easily aged and crushed and protruded into the tube, shifted from a predetermined position, and oozed and separated, mixed into the fluid food, contaminated the food fluid, and the quality of the final food was significantly reduced.

  In addition, the packingless joint has a problem that the transport fluid food easily leaks to the outside due to internal pressure and leaks from the joint.

  In view of this, a device has been devised to improve airtightness by bringing the joint surfaces into contact with each other and pressing them with screws (for example, Patent Documents 1 and 2).

  However, since all of them intervene packing, deformation leakage due to aging is unavoidable, and the mechanism is complicated.

Japanese Utility Model Publication No. 3-15897 (specification, column 4, lines 30 to 32) JP-A-11-230436 (specification “0041” purge boat 3, “0054” packing 17A, 17B)

  An object of the present invention is to provide a complete seal by tightening an annular band between a taper surface and a ridge line of a corner edge at the opposite ends of the flange portions of both pipes without using packing at the joint portion of two pipes.

In order to achieve the above object, according to the present invention, first, flanges are provided on the outer circumferences of the opposing ends of two pipes arranged on a common center line, respectively, a tapered surface along the inner circumference of the opposing ends, A crimping means for forming a corner edge in contact with the tapered surface along a circumferential circle, crimping the tapered surface and the corner edge in a circumferential shape, and sealing the opposing end along a circumferential crimping line; A pipe fitting comprising:
Secondly, the pipe joint according to the first invention, wherein a tapered surface or a corner edge is projected or recessed at either one or the other opposing end,
Thirdly, the pipe joint according to the first aspect of the present invention, wherein a tapered surface or a corner edge protrudes or is recessed in an annular disc having an opposing end and an opposing end interposed therebetween,
Fourth, the pipe joint according to any one of the first to third inventions, wherein the crimping means is a clamping device that slides the flange steplessly in the facing direction.
Consists of.

Therefore, by sliding the flange in the opposite direction along the common center line by the clamping device (crimping means),
The tapered surface and the corner edge are in contact with a circumferential shape centered on the center line, and are further crimped to form a circumferential opposed end sealing portion.

  Since the present invention is configured as described above, the flange at the opposite end of the tube can be tightened in the opposite direction, and the other corner edge is formed in the opposite direction (common center) on the tapered surface formed at one of the opposite ends of the tube. The corner edge can be strongly tightened to the tapered surface via an annular disk between the opposite ends, thereby preventing leakage of the fluid in the pipe from the joint without packing.

  Two stainless steel pipes 1 and 1 are arranged on a common center line c, and flanges 2 and 2 are arranged on the outer circumferences of the opposite ends 1 'and 1' of both pipes 1 and 1, respectively. Provide one.

  The opposing surfaces 2 'and 2' of the flanges 2 and 2 are parallel surfaces orthogonal to the center line c, and the back surfaces 2 "and 2" of the flanges 2 and 2 are respectively connected to the other end sides of both the tubes 1 and 1. It inclines toward the said centerline c, and the inclination | tilt angle (alpha) is the same (FIG. 5 (A) figure).

  Further, a tapered surface 3 is provided so as to incline toward the center line c toward the other opposing end 1 'along the inner circumferential circle of one opposing end 1'.

  In addition, a corner edge 4 in contact with the tapered surface 3 is formed along the inner circumferential circle of the other opposing end 1 '.

  The inclined groove surfaces 5 'and 5' of the annular groove-type tightening bands 5 and 5 (clamping device / crimping means) are in contact with the rear surfaces 2 "and 2" of the flanges 2 and 2, respectively, and the bands 5 and 5 are tightened. By tightening in the opposite direction with the attachment 6, the corner edge 4 is pressed against the tapered surface 3 and tightly sealed.

  As shown in FIGS. 3 and 4, the bands 5 and 5 are formed in an annular shape by pivotally supporting the groove-shaped fastening bands 5 and 5 facing both ends of the linkage 5 ″ by pins 7 and 7, respectively. One end of the other band 5 is inserted into an openable / closable fastener 6 pivotally supported by a pin 8 at one end of the band 5, and a tip end 5 a (insertion portion) is inserted into an upper end female screw of the fastener 6. Rotating the thumb screw head 9 ′ of a screw (bolt) 9 screwed into the portion 6 ′, the tip 5 a is directed to the pin 8 at the lower end of the fastener 6 at the lower end of the screw 9. Press.

  The bands 5 and 5 facing each other are pressed in the facing direction (vertical direction in FIG. 4) by the pressing, and the inclined groove surfaces 5 ′ and 5 ′ of the bands 5 and 5 are the back surfaces 2 ″ and 2 ″ of the flanges 2 and 2 respectively. Are strongly pressed and tightened in the opposite direction (the direction of the common center line c), so that the taper surface 3 and the corner edge 4 are circumferentially crimped, and the taper surface 3 is joined to the corner edge 4 along the circumferential crimp line. By tightening, the inner peripheral portions of the opposed ends 1 ′ and 1 ′ can be completely sealed (FIGS. 5A and 6B and FIGS. 6A and 6B).

The taper surface 3 is formed on the entire outer periphery of the annular portion 1 ″ projecting integrally from the inner circumferential circle of one opposing end 1 ′ to the same diameter as the inner diameter d of the tube 1;
A 90-degree intersection circle between the inner peripheral surface 1a of the other opposing end 1 ′ sharing the center line c and the opposing surface 2 ′ of the flange 2 forms the corner edge 4, and the corner edge 4 is the annular portion 1. The entire outer periphery (tapered surface 3) of "" is pressed in a direction parallel to the center line c.

  Further, the taper surface 3 can be formed (recessed) along the inner circumferential circle of the other opposing end 1 ′, and the corner edge 4 can be formed at the upper end of the one protruding annular portion 1 ″. (FIG. 7 (A) (B)).

  The corner edge 4 of the other opposed end 1 ′ can be formed on the upper edge of the square notch 10 formed along the inner circumference of the other opposed end 1 ′. In that case, FIG. As shown in the figure, the inner diameters d of the two tubes 1 and 1 can be made the same, and the thicknesses of both the tubes 1 and 1 can be made the same.

Accordingly, the inclined groove surfaces 5 of the clamping bands 5 and 5 are formed on the inclined back surfaces 2 "and 2" of the flanges 2 and 2 provided at the opposite ends 1 'and 1' of the tubes 1 and 1 disposed on the common center line c. Interview ', 5'
By tightening the bands 5 and 5 with the fastener 6, the flanges 2 and 2 are pressed in the direction of the center line c,
By the pressing, the corner edge 4 can be pressed against and tightened to the tapered surface 3.

  Since the tip of the corner edge 4 is a circular ridge line, the ridge line is pressed against the annular tapered surface 3, so that a strong circular ridge line of the corner edge 4 is pressed against the tapered surface 3. .

  That is, with respect to the ring-shaped tapered surface 3 that is gently inclined toward the center line c with the center line c as the center, the corner edges 4 that form the inner circumference centered on the center line c are opposed ends 1 ′, 1 ', The inclined back surfaces 2 ", 2" of the flanges 2, 2 are in contact with the inclined groove surfaces 5', 5 'of the fastening bands 5, 5, and the bands 5, 5 In order to back up the pressure contact between the corner edge 4 and the taper surface 3 in the direction of the center line c by tightening with the above, the gently inclined surface (taper surface c) and the corner edge 4 have a corner edge 4 along the inclination of the taper surface 3. Tighten it so that it can be tightened.

  That is, unlike the case where the ridge is press-contacted at right angles to the erected surface, the ridge (corner edge 4) is press-contacted in the center line direction to the taper surface 3 which is gently inclined with respect to the center line c. The tightening phenomenon increases as the taper surface 3 is tightened and the inclination angle β of the taper surface 3 (FIG. 5A) is small.

  15 (a) and (b) are partial longitudinal sectional views of a conventional pipe joint. FIG. 15 (a) is an inlay-type surface joint and FIG. 15 (b) is a packing interposition surface joint.

  11 is a transport pipe, 12 is a male thread portion for screwing a transport pipe provided on the other end side of the pipe 1, 13 is a transport pipe female screw holding ring, and 14 is a transport pipe retaining flange.

  Further, as shown in FIG. 8 and subsequent figures, an annular facing groove 15 is formed (concave) on the facing surface 2 ′ of the flanges 2 and 2 while sharing the center line c, and its entrance corner edges 4 and 4 are set to 90 degrees. The cross-sectional shape of the facing groove 15 may be a laterally U-shaped (FIGS. 8, 9, 11, and 12) or a laterally U-shaped (FIGS. 10, (A), (B)).

  The short inner pipe 17 is fitted to both the pipes 1 and 1, and an annular disk 18 integrally provided near the center or one end of the short inner pipe 17 is disposed between the opposing surfaces 2 ′ and 2 ′ of the flanges 2 and 2. To intervene. In this state, the short inner tube 17 shares the center line c. Further, only the disk 18 can be interposed in the disk 18 without using the short inner tube 17 (FIG. 13).

  Annular protrusions 19, 19 are formed (projected) at symmetrical positions on both surfaces of the annular disk 18, and formed on the opposed surfaces 2 ′, 2 ′ of the flanges 2, 2 (recessed). , 15 are provided at positions corresponding to.

  As shown in FIGS. 11 (a) and 11 (b), the protrusions 19 and 19 have a large base end width L, a small front end width l and a projecting tapered surface 3 from the base end 19 ′ to the front end 19 ″. 19 are provided at symmetrical positions (FIG. 11 (A)) or either inside or outside (FIG. 11 (B)) on both inner and outer sides.

  At the entrances of the annular facing 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), 10 (A) and 10 (B). B) The figure is formed so as to be in pressure contact with at least one of the corner edges 4 (FIG. 9 (b), FIG. 10 (b), and FIG. 11 (b)).

  Each of the corner edges 4 and 4 is a right-angled ridge edge, and the top is a ridge line shape, and at least one of the tapered surfaces 3 and 3 of the protrusion 19 is at least one of the corner edges 4 and 4. The protrusions 19, 19 enter the annular facing grooves 15, 15 until they are in pressure contact with each other (FIGS. 9A, 10 B, 10 A, B, and 11 B). Figure)

  By the way, the taper surfaces 3, 3 of the projections 19, 19 have a width from the base end 19 'to the tip 19 ", that is, a half (L-l) in FIG. 11 (a) and a (L) in FIG. −l) is a width that can come into contact with the corner edge 4, and in the range of the width ½ (L−l) or (L−l), the tapered surface 3 abuts against the corner edge 4, and a precision error ( (For example, about 1/100 to 2/100 mm) As shown in FIGS. 11A and 11B, the tapered surface 3 and the corner edge are within the range of 1/2 (L-1) or (L-1). 4 is in pressure contact, and at least one of the tapered surfaces 3 and at least one of the corner edges 4 are in pressure contact with each other, or both of the taper surfaces 3 and 3 are in pressure contact with both of the corner edges 4 and 4, whereby the fluid particles in the tube 1 Shut off and will not leak.

  Of course, the tip width l of the annular protrusion 19 is smaller than the bottom width l ′ of the annular facing groove 15.

  As shown in FIGS. 8 to 10, the annular disk 18 is provided on the outer periphery near one end of the short inner tube 17 fitted to the inner surfaces of the two tubes 1 and 1, so that the short inner tube 17 near the other end is provided on one side. In the state where the pipe 1 is fitted and held, the short end of the short inner pipe 17 is fitted from the rear end of the other pipe 1 so that the annular disk 18 is connected to the opposing surfaces 2 ′, 2 of the flanges 2, 2. It can be held between 2 '(FIGS. 8 to 10).

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

  As shown in FIG. 3, annular groove-type fastening bands 5 and 5 that are pressed against the rear surfaces 2 "and 2" of the flanges 2 and 2 are pivotally attached to both ends of a short link 5 "by pins 7 and 7, respectively. Then, the lower end portion of the frame-shaped fastener 6 is pivotally supported by the pin 8 at the distal end portion of one of the bands 5, and the distal end portion 5 a of the other band 5 is inserted into the fastener 6 to be tightened. A bolt 9 is screwed into a female screw portion 6 ′ provided at the upper end portion of the tool 6, and a butterfly bolt head 9 ′ is rotated so that the tip end portion 5 a of the other band 5 is connected to the lower end of the bolt 9. By pressing toward the front end of the band 5, the groove-shaped inclined groove surfaces 5 'and 5' of the tightening bands 5 and 5 are pressed against the rear surfaces 2 "and 2" of the flanges 2 and 2, respectively. The flanges 2 and 2 are pressed in the opposite direction (FIG. 9 (a), arrows a and a ′).

  The flanges 2 are sandwiched between the annular protrusions 19 and 19 or the taper surfaces 3 and 3 of the annular protrusions 19 and 19 by pressing the annular opposing grooves 15 and 15 respectively. It will be sealed by the pressed annular disc 18.

  The annular facing grooves 15 and 15 and the annular projections 19 and 19 are precisely machined at symmetrical positions as shown in FIGS. 8 to 10, but the outer tapered surface 3 and the outer side shown in FIGS. Even if a non-contact portion t due to an error of about 1/100 to 2/100 mm occurs between the corner edge 4 and the taper surface 3, the width in the inner and outer direction 1/2 (Ll) (FIG. 11 (a)). ) Or (L-l) (FIG. 11 (b)), the inner tapered surface 3 and the inner corner edge 4 always come into contact with each other, so that leakage of fluid in the pipes 1 and 1 is prevented. In FIGS. 11A and 11B, reference numeral 16 denotes a bottom portion of the facing groove 15.

  Further, the conventional rubber packing 20 shown in FIG. 15 is removed from the annular facing grooves 15 and 15, the annular disk 18 is arranged between the opposing grooves 15 and 15, and the annular protrusions 19 and 19 on both sides are connected to the opposing grooves. 15 and 15 are inserted 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 prevent leakage of fluid in the tubes 1 and 1. it can.

  A tightening nut 21 can be used in place of the band 5 in the pipe joint portion on the common center line c.

  That is, as shown in FIGS. 14A and 14B, the outer diameter of one flange 2 is formed slightly larger than the outer diameter of the other flange 2, and a male screw 22 is formed on the outer peripheral surface of the one flange 2. The outer peripheral surface of the other flange 2 is formed lower than the height of the male screw 22.

  A female screw 22 ′ formed on the inner peripheral surface of the annular body 21 ′ with both flanges 2, 2 close to each other along the common center line c is screwed into the male screw 22, and the other side of the annular body 21 ′ A ring 21 ″ that engages 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 (clamping device / crimping means). Both flanges 2 and 2 can be brought into pressure contact with each other via the corner edge 4 and the taper surface 3 by being screwed and tightened to the flange 2 side.

  At this time, the back surfaces 2 ", 2" of the flanges 2, 2 are preferably orthogonal to the common center line.

In short, the flanges 2 and 2 are provided on the outer periphery of the opposing ends of the two pipes 1 and 1 arranged on the common center line c, respectively, and the tapered surface 3 along the inner peripheral circle of the opposing end, and the inner peripheral circle And the corner edge 4 in contact with the tapered surface 3 along
Crimping means for crimping the tapered surface 3 and the corner edge 4 in a circumferential shape and sealing the opposing end along a circumferential crimping line is provided, and either the tapered surface 3 or the corner edge 4 is provided. Or protruding or recessed at the other opposite end,
Alternatively, the tapered surface 3 or the corner edge 4 is protruded or recessed in the annular disk 18 interposed between the opposing ends and the opposing ends,
The crimping means is a clamping device that slides the flanges 2 and 2 steplessly in the opposing direction, such as the annular groove-shaped clamping bands 5 and 5 and the clamping nut 21.

  Especially this invention can be used for the joint part of the piping which conveys liquid foods, such as soy sauce and mayonnaise, in food manufacturing factories.

It is a longitudinal cross-sectional view which shows the pipe joint of this invention. It is a longitudinal cross-sectional view of a tightening band mounted state. It is a front view of a fastening band wearing state. It is a front view of the flange clamping | tightening state by a clamping band. (A) The figure is an enlarged vertical cross-sectional view of the joint portion of both pipes having different inner diameters, and (B) is a vertical cross-sectional view of the band tightened state of (A). (A) The figure is an enlarged vertical sectional view of the joint portion of the pipe having the same inner diameter, and (b) the figure is a vertical sectional view of the band tightened state of (a). (A) The figure is an enlarged vertical sectional view of the arrangement state of the corner edge and the tapered surface, and (b) is a longitudinal sectional view of the joint state in the same thickness of both pipes. It is a longitudinal cross-sectional view which shows the pipe joint of this invention. (A) The figure is a partially enlarged side view of FIG. 8, (b) The figure is a partially enlarged side view of another embodiment of (a) figure. FIG. 8A is a partially enlarged side view of FIG. 8 showing another example of the annular facing groove, and FIG. 8B is a partially enlarged side view showing another embodiment of FIG. (A) The figure is an enlarged vertical sectional side view of the sealed state due to the precision mechanical error between the annular protrusion and the annular opposed groove, and (b) is an enlarged longitudinal sectional view of another embodiment of (a). It is a partial vertical side view of the other Example of this invention. It is a partial longitudinal cross-sectional view of the state except a short tube. (A) The figure is a longitudinal cross-sectional view of the pipe joint in a state where the flange is crimped by the tightening nut, and (b) is a partially enlarged view of (b). (A) The figure is a partially longitudinal sectional side view of the spigot joint, and (b) is a partially longitudinal sectional view of the packing interposition joint.

Explanation of symbols

c Common center line 1 Tube 1 'Opposite end 1 "Annular part 2 Flange 3 Tapered surface 4 Corner edge 5 Annular grooved clamping band 18 Annular disk 21 Tightening nut

Claims (13)

An annular disc for sealing that is disposed between opposing surfaces of flanges provided at ends of pipes to be connected and seals between the opposing surfaces ,
A circular inner peripheral surface has a inner peripheral surface coaxially to the circular peripheral surface, and both sides of the side surfaces, the side surface of the two sides each have an annular projection,該Tokki is has the inner peripheral surface and coaxial conical tapered surface, inserting the annular discs when it is set between the opposing surfaces, the annular groove formed on the opposite surface of the projecting outs corresponding is, by Rukoto is engaged with the corner edge of the annular tapered surface of the protrusion is defined at the intersection between the groove and the facing surface, the sealing between the annular circular plate and the opposing surface is made, A sealing annular disc in which a gap is formed between the opposing surface and the corresponding side surface.   The annular disk for sealing according to claim 1, wherein the square edge is a right-angled edge.   The annular disc for sealing according to claim 1 or 2, formed of stainless steel. A pair of flanges provided at the ends of the pipes to be connected and having opposing surfaces facing each other;
The opposing surface of one flange has an annular groove coaxial with the one flange,
The opposing surface of the other flange is an annular protrusion coaxial with the other flange, and has a protrusion formed with a conical tapered surface coaxial with the other flange.
When the pipe is connected, the protrusion is inserted into the groove, and the tapered surface of the protrusion engages with an annular corner edge defined at the intersection of the groove and the opposing surface on which the groove is formed. Thus, the pair of flanges are sealed so that a gap is formed between the opposing surfaces .   The pair of flanges according to claim 4, wherein the corner edge is a right-angled edge.   The pair of flanges according to claim 4 or 5, formed of stainless steel. A flange provided at an end of one of the pair of pipes to be connected;
An opposing surface facing the end of the other tube;
An annular protrusion formed on the opposite surface , the protrusion having a conical tapered surface coaxial with the flange, and
When the pipe is connected, the protrusion of the flange is inserted into an annular groove formed on the opposite surface of the flange provided at the end of the other pipe, and the tapered surface of the protrusion is the groove and the groove. A flange in which a gap between the opposing surfaces is created by engaging an annular corner edge defined at an intersection with the opposing surfaces so that the flanges are sealed.   The sealing flange according to claim 7, wherein the corner edge is a right-angled edge.   The flange according to claim 7 or 8, which is made of stainless steel. A pair of flanges provided at the ends of the pipes to be connected and having opposing surfaces facing each other;
The opposing surface of one flange has an annular portion that is concentric with the one flange, protrudes toward the other flange, and has a tapered tapered surface that tapers .
The opposing surface of the other flange has an annular corner edge that is coaxial with the other flange,
When the pipes are connected, the corner edge engages with the tapered surface, so that the pair of flanges are sealed, and a gap is formed between the opposed surfaces. A pair of flanges. A pair of flanges provided at the ends of the pipes to be connected and having opposing surfaces facing each other;
The opposing surface of one flange has an annular portion that protrudes toward the other flange, and has an annular corner that is coaxial with the one flange at the tip.
The opposing surface of the other flange has a conical tapered surface that is coaxial with the other flange and tapers backward.
When the pipes are connected, the corner edge engages with the tapered surface to seal between the pair of flanges, and a pair of gaps are formed between the opposing surfaces facing each other. Flange.   The pair of flanges according to claim 10 or 11, wherein the corner edges are right-angle edges.   The pair of flanges according to any one of claims 10 to 12, formed of stainless steel.

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