JP4505681B2 - Metal flexible tube - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a metal flexible tube used for changing the direction of piping or absorbing vibration in various pipes for sending fluid.
[0002]
[Prior art]
For metal hard pipes used to send water and sewage, gas, etc., or to transmit power by hydraulic pressure, to change the direction of the pipes appropriately and to absorb vibration, expansion and contraction A pipe is provided in the middle of the pipe. The metal flexible tube is mainly composed of a hollow cylindrical hooked tube formed by alternately repeating peaks and valleys along the longitudinal direction on the peripheral wall surface, and is provided at the end portion thereof. The end side surface of the collar portion is used as being tightly fixed to the connected pipe with the sealing surface. With a hooked tube, a long straight pipe is used as a material pipe, and a load is applied from the inside or outside of the cylinder to bulge the mountain at every required interval to form a long continuous pipe. It cut | disconnects and the collar part is formed in the terminal part. Then, a metal wire mesh cylindrical blade is externally fitted to the outer surface of the flanged tube, and is connected to the connected pipe through a connection fitting at the connecting portion with the connected pipe and securing a seal at the flange. It is normal. The structure of the terminal portion of the metal flexible tube is important because it directly affects the connection strength with the connected tube and the flexibility in the centering direction. For example, Patent Document 1 (see FIG. 4) and FIG. 5 and FIG. 6 have been proposed.
[0003]
[Problems to be solved by the invention]
In each of the metal flexible pipes of Patent Document 1 (FIG. 4) and FIG. 5, the blade 12 is fitted on the outer surface of the flanged tube 10, and the end of the blade is made of a metal collar 50 and a metal ring 52. Since it is simply clamped between the blades and fixed in the radial direction of the blade, when the fluid pressure inside the hose is high and a large axial force is applied inside the hose, the ring and blade or blade and collar Because the blade receives the force due to the frictional force between the ring and the collar, the blade may come off in the axial direction, and the barbed tube 10 may not be protected. Therefore, it is applied only for supplying low-pressure fluid. There was a problem that could not be done. Further, in the metal flexible tube shown in FIGS. 4 and 5, the restriction of the blade only squeezes the blade end in the longitudinal direction in the radial direction. If the outside of the metal flexible tube is in a relatively high temperature atmosphere, the caulking may be loosened due to the difference in thermal expansion between the ring 52 and the collar 50, and the blade may also be detached in the axial direction. Therefore, the environment in which these metal flexible tubes are used is also limited. Furthermore, a lap joint-shaped or ring-shaped member having such an L-shaped bent portion is necessary, and the component cost is high. On the other hand, in the metal flexible tube shown in FIG. 6, the blade 12 and the flanged tube 10 are welded to the collar 50 at the same time. The metal flexible tube of FIG. 6 can eliminate the risk of the above-described detachment of the blade. However, since the flanged tube and the blade are made of a thin-walled material such as stainless steel and a mesh body, heat generated by direct heating during welding is used. Because of the affected part, the corrosion resistance of this welded part is reduced, and all-around welding w over the entire circumference of the flanged tube by arc welding while simultaneously supplying shield gas such as TIG welding is required. There is a problem that the cost is high and a high skill level is required for welding work. In addition, like in FIGS. 4 and 5, the lap joint-shaped member is expensive.
[Patent Document 1]
Japanese Patent Laid-Open No. 6-226382 (paragraph number 0014, FIGS. 1 and 2)
[0004]
The present invention has been made in view of the above-described conventional problems, and the purpose thereof is to supply a high-pressure fluid, to prevent the blade from coming out even in a severe use environment, and to be easily manufactured in a short time, It is another object of the present invention to provide an improved metal flexible tube that can reduce costs.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention has a cylindrical tube 10 formed by alternately repeating crests p and troughs r, and a metal wire knitted on the flanged tube to form a cylindrical shape. in metallic flexible tube comprising a blade 12, a connecting portion between the connecting pipe of the metallic flexible tube is, have a diameter size of the holes that may inserted through the fluted tube 10 (18, 19) Two metal plate materials 21 and 22 whose plate surfaces are opposed to each other along the side surface of the flange joint for connection and the end of the blade 12 are resistance-welded in a state of being sandwiched between the two metal plate materials and fixed to each other. And an integrally fixed portion 16 in which the plate surfaces (21a, 22a) of the metal plate member are installed at a required angle with respect to the longitudinal axis 300 of the flanged tube 10 when connected to the connected pipe (200). , One side of the metal plate sandwiching the blade 12 (2 composed of a metallic flexible tube, characterized in that the joint seat surface which is formed by disposing the terminal portion of the pleated tube 10 along the a). The metal plate material is blade fixing means that is disposed at a required angle with respect to the longitudinal axis 300 of the flanged tube 10 when the connected pipe that is the connection partner is connected, and the material is stainless steel, iron, or other You may comprise from a metal. The angle of the plate surface of the metal member with respect to the flanged tube axis 300 may be a right angle or other angle with respect to the axis depending on the connection mode between the self flange joint and the joint of the opposite pipe member. It may not be 90 degrees. Therefore, the end portions of the blades sandwiched between them may be in a bent state of 90 degrees or in an arrangement state at an angle of more or less. Further, the metal plate material may be formed by curving a part or all of the metal plate material, without being constituted by a completely flat plate material having all of the plate surfaces as flat surfaces. In this case, for example, the end portion of the blade is not arranged in a bent state corresponding to the curved configuration on the inner diameter side, but may be arranged so as to draw a gentle arc in the cross section. The metal plate material is a plate material in which a hole through which the flanged tube and the blade can be inserted is drilled in the central portion, but the appearance may be a configuration in which the through hole is drilled in a rectangular or polygonal plate instead of a circular plate. Also, the two metal plate materials may have the same size, or may be configured with different sizes as in the embodiment. Furthermore, resistance welding performed with the end of the blade 12 sandwiched between two metal plates includes, for example, projection welding, seam welding, upset welding, flash welding, etc., but the heating time is short and a special shielding gas is used. Spot welding that eliminates the need is advantageously applied.
[0006]
Further, the flanged tube 10 has a straight pipe portion 102 connected to the trough portion r1 at the end thereof and extended with an approximately same diameter as the adjacent peak portion p1, and the end portion of the straight pipe portion is perpendicular to the diameter direction. It is preferable that the seal connection seat 106 is formed by folding the front end of the shape (104) back to the seal connection side.
[0007]
Furthermore, it is preferable that the outer peripheral portion of the outer metal plate material 22 be slightly bent toward the other metal plate material 21 side.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a metal flexible tube according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same components as those of a conventional metal flexible tube will be described with the same reference numerals. FIG. 1 is an enlarged explanatory view of a main part of a metal flexible tube according to the first embodiment. The metal flexible tube according to the first embodiment is fitted on the outer surface of the flanged tube 10 and the flanged tube. And the integral fixing portion 16 including the two metal plate members 21 and 22 provided on the end portion side of the metal flexible tube.
[0009]
As for the tube with a hook, a long stainless straight pipe or the like is used as a material tube, and a load is applied from the inside or outside of the cylinder to bulge the crest at every required interval, and crest p and trough It is a pipe member with a hook formed by repeatedly forming r and continuously cutting the pipe to a required length. In particular, in this embodiment, it is substantially the same as the adjacent peak part p1 connected to the terminal valley part r1. A straight pipe portion 102 extended with the same diameter, and a seal connection seat 106 formed by bending the end portion of the straight pipe portion perpendicularly to the diametrical direction (104) and folding the tip thereof toward the seal connection side. It has a terminal structure. The straight pipe portion 102 has an angle of about 90 degrees with respect to the longitudinal axis of the flanged tube, for example, due to the seal pressure contact with the other flange joint or the like when the metal flexible pipe is connected to the connected pipe. When the blade sandwiched between the metal plates is placed at a bent angle of approximately 90 degrees, the hooked tube 10 receives the bent portion 13 of the blade via the metal plate and the integral fixing portion 16 is installed. So that it can be engaged stably and reasonably. The metal plate members 21 and 22 that sandwich the blade also back up the seal connection seat 106 when the pressure contact is made with the other flange joint or the like when the blade is connected. The straight pipe portion includes a seal connection seat 106 formed by bending the end portion of the straight pipe portion at a right angle in the diametrical direction (104) and folding the tip of the straight pipe portion toward the seal connection side. Thus, the water tightness of the flanged tube can be reliably maintained.
[0010]
The blade 12 is formed in a cylindrical shape by knitting a metal wire such as a stainless steel wire like the conventional one, and is attached from the outer surface of the flanged tube 10 so as to be flexible including flexibility and misalignment absorption. This is a cylindrical wire mesh protecting means that protects the barbed tube 10 located inside thereof while maintaining the properties, and in particular, reinforces the strength against the force in the longitudinal axis direction due to the fluid pressure inside the barbed tube. As will be described later, the end of the blade is integrated by being sandwiched between the metal plates, and at that time, the end of the blade 12 is expanded so as to form, for example, a donut-shaped brim 122, and is substantially omitted. It can be bent at right angles.
[0011]
The integrally fixed portion 16 is a portion that is fixed integrally by resistance welding with the end portion of the blade 12 sandwiched between two metal plate materials 21 and 22 having holes 18 and 19 in the center, as shown in FIG. The inner metal plate material 21 and the outer metal plate material 22 are made of a thick metal plate having a hole 18 having a diameter larger than at least the peak portion p of the flanged tube 10. In the embodiment, the metal plate materials 21 and 22 are formed in a donut disk shape, and the inner metal plate material 21 is smaller in outer shape than the outer metal plate material 22 and thinner than the outer metal plate material. Yes. The plate surfaces 21a and 22a of the metal plate materials 21 and 22 are arranged in an upright state in the drawing so as to be orthogonal to the longitudinal axis direction of the flanged tube when connected to the pipe to be connected. At the time of connecting and connecting to the pipe to be connected, the outer surface of the inner metal plate 21 is applied to the side surface of the flange joint 26 and is backed up by the own flange joint 26 when connected to the other tube, and the outer surface of the outer metal plate 22 Is provided with a terminal portion of the flanged tube 10 for sealing at the time of connection.
[0012]
At the time of forming the integrally fixed portion 16, the one end portion of the blade 12 is inserted into the hole 18 of the inner metal plate material 21 and inserted until it is brought into close contact with the flange portion 122. Next, the outer metal plate 22 is applied to the outer surface of the flange 122 of the blade so that the entire donut-shaped flange of the blade is sandwiched between the two donut-shaped metal plates 21 and 22. In this state, for example, spot welding is performed from the outside of both metal plate materials at, for example, 6 points of equiangular radiation, contact resistance welding is performed at the portion where the electrode is pressed, and the metal plate material 21-blade collar 122-metal The plate material 22 is integrally fixed.
[0013]
Then, the bent portion 104 of the flanged tube and the seal connection seat 106 are arranged along the outer surface of the outer metal plate 22 among the metal plates sandwiching the flange portion 122 of the blade to form a joint sheet surface. Then, a flange joint 26 in which the blade 12 is passed through the flange hole is attached to the outer surface side of the inner metal plate 21. When the joint connection is made with the joint 200 of the connected pipe through the bolt hole 28 of the flange joint 26, the metal plate materials 21 and 22 of the integral fixing portion 16 are both bent in a predetermined angle from the longitudinal axis direction of the tube ( Flange) It is sandwiched between joints and fixed by pressure. In the embodiment, the two metal plate members 21 and 22 sandwiching the flange portion of the blade are bent and held at an angle of 90 degrees with respect to the axial direction. In this manner, since the hooked tube bent portion 104 and the seal connection seat 106 are backed up by the integral fixing portion 16, the end portion of the hooked tube has a joint sheet surface. When the flanged tube terminal is further sandwiched and fixed from both sides by a flange joint or the like, the flange 122 of the blade 12 is normally fixed in a state where it is expanded 90 degrees from the longitudinal direction of the tube. Therefore, both the metal plate materials 21 and 22 and the blade are integrally fixed, and the frictional resistance of the bent portion and the deformation resistance of the blade in a state where the metal plate materials 21 and 22 are always held at 90 degrees with respect to the axial force direction are added to the locking force. In addition, the load in the axial direction is distributed, and the strength of the metal flexible tube in the axial direction is high. In particular, as in the present embodiment, since the integrally fixed portion 16 is joined by, for example, spot welding, skill is not required for welding work, and it can be performed easily and efficiently in a short time. Moreover, the force which press-contacts the braid | blade between the metal plate materials 21 and 22 of a sandwich structure by heat contraction of a spot weld part will arise, and the braid | blade 12 in the meantime may be tightened, and it can hold | maintain the high braid | strong adhesive strength. Further, since the end portions of these metal flexible tubes need only be two metal discs, the material cost can be greatly reduced.
[0014]
In the present embodiment, as described above, in particular, the straight pipe portion 102 that is connected to the terminal valley portion r1 and is extended with substantially the same diameter as the adjacent peak portion p1 is provided at the terminal portion of the flanged tube 10. Therefore, both the metal plate members 21 and 22 of the integrally fixed portion 16 can be held so that the blade 12 can be stably disposed in a state where the protection of the hooked tube can be properly performed together with the backup of the seal connection seat 106.
[0015]
FIG. 3 shows an embodiment of the metal flexible tube according to the first embodiment, in which the outer peripheral portion of the outer metal plate 22 is bent at a slight angle toward the inner metal plate 21 and both metal plates. The gap between them may not be directly visible from the outside. In this example, a gap between the two metal plate members is completely shielded by the bent portion 30 of the outer metal plate member 22 having a large outer diameter size, thereby preventing a decrease in commercial value on appearance.
[0016]
The metal flexible tube according to the present invention described above is not limited to the above-described embodiment, and modifications within a scope not departing from the essence of the invention described in the claims are also included in the present invention. .
[0017]
【The invention's effect】
As explained above, according to the metal flexible tube according to the present invention, a hooked tube formed by alternately repeating peaks and valleys, and a metal wire that is attached to the hooked tube is knitted. A metal flexible tube including a blade configured in a cylindrical shape, wherein a connecting portion of the metal flexible tube to a connected tube has two holes having a diameter large enough to allow the flanged tube to be inserted therethrough. When the metal plate and the end of the blade are sandwiched between the two metal plates, resistance welding is performed to fix them, and the plate surface of the metal plate is connected to the longitudinal axis of the hooked tube when connected to the pipe to be connected. And an integrally fixed portion that is installed at a required angle, and is a structure in which a metal plate and a blade are welded and fixed, and is always held at a predetermined angle with respect to the axial force direction. Friction resistance of blade bent part and blade deformation Due to the large locking force against the axial force due to the resistance, it is possible to obtain a metal flexible tube with excellent safety that does not cause the blade to be pulled out even in harsh usage environments including high pressure fluid supply and fluid and ambient temperature. . In addition, since the integrally fixed portion is formed by resistance welding, it is possible to easily and efficiently perform the welding operation in a short time, increase the fixing strength, and reduce the material cost.
[0018]
In addition, since the end portion of the hooked tube is arranged along the one side of the metal plate material sandwiching the blade to form a joint sheet surface, the plate surface of the metal plate material to which the blade is fixed when connected to the connected pipe Can be used to effectively back up the end of the tube with a hook and ensure the sealing inside the tube.
[0019]
Further, the flanged tube has a straight pipe portion connected to a valley portion at the end thereof and extended with substantially the same diameter as an adjacent peak portion, and the end portion of the straight pipe portion is bent at a right angle in the diameter direction. With the structure in which the tip is folded back to the seal connection side to form the seal connection seat, the engagement position between the blade that is sandwiched between the metal plates and bent at the required angle and the metal plate is relative to the axial force It can be stably placed at an unreasonable position, and can be positioned at the time of manufacturing and assembling or guided when assembling.
[0020]
Further, by configuring the outer peripheral portion of the outer metal plate material to be bent slightly toward the other metal plate material, the blade end sandwiched from the gap between the two metal members cannot be seen, so that the commercial value of the appearance can be maintained.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional explanatory view of a main part of a metal flexible tube according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective explanatory view of FIG. 1;
FIG. 3 is an enlarged cross-sectional explanatory view of an essential part showing a modified example of the metal flexible tube of FIG. 1;
FIG. 4 is an enlarged cross-sectional explanatory view of a conventional metal flexible tube.
FIG. 5 is an enlarged cross-sectional explanatory view of a main part of another conventional metal flexible tube.
FIG. 6 is an enlarged cross-sectional explanatory view of a main part of another conventional metal flexible tube.
[Explanation of symbols]
10 Tube with flange, 12 blade, 16 integrally fixed portion, 21 inner metal plate material, 21a plate surface, 22 outer metal plate material, 22a plate surface, p mountain portion, r valley portion, 102 straight pipe portion, 106 seal connection seat, 122 Blade buttock, 200 Connected pipe joint

Claims (3)

In a metal flexible tube including a hooked tube formed by alternately repeating peaks and valleys, and a blade that is attached to the hooked tube and knitted a metal wire to form a cylindrical shape,
The connecting portion of the metal flexible tube to the connected tube is
And two metal plate disposed opposite the plate surface along a side surface of the connecting flange joint to have a diameter size of the holes that may inserted through the pleated tube,
When the end of the blade is sandwiched between the two metal plates, resistance welding is performed to fix them, and the plate surface of the metal plate is at a required angle with respect to the longitudinal axis of the flanged tube when connected to the pipe to be connected An integrally fixed portion installed with
A metal flexible tube comprising: a joint sheet surface formed by arranging a terminal portion of a flanged tube along one surface of a metal plate member sandwiching a blade . The barbed tube has a straight pipe portion that is connected to the valley portion at the end and is extended with substantially the same diameter as the adjacent peak portion,
2. The metal flexible tube according to claim 1 , wherein the end portion of the straight pipe portion is bent at a right angle in the diametrical direction and the tip thereof is folded back to the seal connection side to form a seal connection seat.   The metal flexible tube according to claim 1 or 2, wherein an outer peripheral portion of the outer metal plate is bent slightly toward the other metal plate.

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