JP6632209B2 - V band - Google Patents

Description

  The present invention relates to a V-band, and more particularly to a V-band for connecting a pair of tubular bodies by clamping a pair of flanges formed at connection ends of the pair of tubular bodies by tightening the band portions.

  As a conventional V band, for example, the one described in Patent Document 1 is known. The V band has two half shells having a trapezoidal cross section. One end of each of the two half shells is rotatably connected to each other by a connection mechanism, and the other end is configured to be able to approach and separate from each other by a tightening mechanism having a tightening bolt. In this V band, two half shells are arranged around a pair of flanges respectively formed at connection ends of a pair of tubular bodies, and the two half shells are tightened by tightening bolts, so that the pair of flanges acts as a wedge. Thus, the pair of tubular bodies can be connected by being sandwiched.

  Another example of the V band will be described with reference to FIG. The V band 50 includes an arc-shaped band portion 60. The band portion 60 is connected to the first band member 61 and the second band member 62, and to one end of each of the first band member 61 and the second band member 62, to thereby form the first band member 61. And a connecting mechanism 63 for rotatably connecting the second band member 62 and the second band member 62 to each other. The connecting mechanism 63 is provided with locking members 64 and 65 connected to one ends of the first band member 61 and the second band member 62, respectively, and rotatably connects the locking members 64 and 65 to each other. And a link member 66 to be provided.

  Brackets 67 and 68 are connected to the other ends of the first band member 61 and the second band member 62, respectively. Holes 67a and 68a are formed in the brackets 67 and 68, and a tightening bolt constituting a tightening mechanism is arranged through the holes 67a and 68a. The fastening bolt can be screwed into the nut and rotated so that the other end portions of the first band member 61 and the second band member 62 approach each other, so that the band portion 60 can be fastened.

  The first band member 61 is formed with a groove 69 that opens in an arc shape from one end to the other end. The groove 69 is formed to have a trapezoidal cross-section, with the side walls 70a and 70b on both sides forming the opening being tapered from the bottom 70c of the groove 69. The groove 69 has the same opening width, that is, the maximum opening width between the side walls 70a and 70b, in the arc-shaped circumferential direction of the first band member 61, and the width of the bottom portion 70c is also changed in the circumferential direction. Of the same size. A similar groove 69 is also formed in the second band member 62.

  As shown in FIG. 4, when the V band 50 is used, the band portion 60 is disposed so as to surround the pair of flanges 73 and 74 formed at the connection end portions of the pair of tubular bodies 71 and 72, respectively. . As shown in the partial cross-sectional view of FIG. 5, the flanges 73 and 74 have inclined surfaces 73b and 74b whose surfaces on the side opposite to the connection side end surfaces 73a and 74a become thinner toward the outer periphery. A seal member 75 made of, for example, a ring-shaped gasket is disposed between the connection side end surfaces 73a and 74a.

  FIGS. 6A to 6D are views showing a procedure for connecting the pair of tubular bodies 71 and 72 by the V-band 50. First, as shown in FIG. 6A, with the first band member 61 and the second band member 62 opened, the band portion 60 is moved around the flanges 73 and 74 of the pair of tubular bodies 71 and 72. The flanges 73 and 74 are inserted into the groove 69 at one end of each of the first band member 61 and the second band member 62 to which the connecting mechanism 63 is coupled. Next, as shown in FIGS. 6B and 6C, the first band member 61 and the second band member 62 are rotated so as to close, and the first band member 61 and the second band member are rotated. Flanges 73 and 74 enter grooves 69 at the other end of member 62, respectively. Then, as shown in FIG. 6D, the brackets 67 and 68 are brought close to each other and the band portion 60 is tightened using tightening bolts and nuts (not shown) to thereby tighten the first band member 61 and the second band member. The flanges 73 and 74 are made to enter the whole groove 69 of 62.

  As shown in FIG. 6D, when the band portion 60 is tightened, as shown in FIG. 5, a tightening force acts on the first band member 61 in the direction indicated by the arrow A, and the flanges 73, 74 are formed. Enters the groove 69. As a result, the flanges 73 and 74 are displaced in directions approaching each other as shown by arrows B and C by the wedge action, and are tightly held via the seal member 75. Thus, the pair of tubular bodies 71 and 72 are connected to each other. FIG. 5 is a sectional view taken along line DD of FIG.

JP 2014-25582 A

  However, the present inventor has conducted intensive studies and found that the V band 50 shown in FIG. 4 has points to be improved as described below. That is, when the V band 50 is tightened, the entire first band member 61 moves in the direction indicated by the arrow in FIG. Here, looking at the cross section in the width direction of the opening of the groove 69 along the moving direction, the cross section taken along the line AA located at the middle part in the circumferential direction of the first band member 61 is as shown in FIG. FIG. 8B shows a cross section taken along line BB located at the other end to which the fastening mechanism is coupled.

  As is clear from FIGS. 8A and 8B, the length of the side walls 70a and 70b forming the groove 69 from the bottom 70c is longer than that of the intermediate portion shown in FIG. 8A. Is longer at the other end. The opening width of the groove 69 is the same. As a result, the taper angle θe of the side walls 70a and 70b expanding from the bottom 70c at the other end becomes an acute angle than the taper angle θc at the intermediate part. Even at the one end to which the coupling mechanism 63 is coupled, the cross-sectional shape of the groove 69 is more acute than at the middle, though not so much as at the other end.

  Therefore, when the band portion 60 is fastened, the flanges 73 and 74 are less likely to bite into the groove 69 particularly at the other end portion of the first band member 61, so that predetermined fastening may be difficult. Also, forcible tightening may cause plastic deformation of the first band member 61. Although not shown, the same applies to the second band member 62.

  Further, even if the predetermined tightening can be performed, the cross-sectional shape of the groove 69 along the moving direction of the first band member 61 and the second band member 62 (the taper angle of the side walls 70a and 70b) is as described above. In the circumferential direction, the first band member 61 and the second band member 62 locally come into contact with each other at the flanges 73 and 74. Therefore, the surface pressure acting on the seal member 75 is low in a region corresponding to the intermediate portion of each of the first band member 61 and the second band member 62, as shown by hatching in FIG. Is slightly higher in the area corresponding to the above, and higher in the area corresponding to the other end, and becomes uneven in the circumferential direction, so that the tightening property is reduced. In FIG. 9, the surface pressure acting on the seal member 75 is indicated by the density of dots, and the denser the dots, the higher the surface pressure.

  Such a problem similarly occurs in the V band disclosed in Patent Document 1. The same applies to the case where the band portion is a V band formed of a single band member.

  The present invention has been made in view of the above, and an object of the present invention is to provide a V-band capable of easily and surely connecting a pair of tubular bodies and improving a tightening property.

The invention of a V-band according to claim 1, which achieves the above object, is characterized in that a pair of flanges respectively formed at a connection end portion of a pair of tubular bodies are clamped by tightening an arc-shaped band portion. V band for connecting the, the band portion has a groove that opens to the inside of an arc and sandwiches the pair of flanges, the groove, the side walls on both sides forming the opening , A convex bead that is tapered from the bottom of the groove and that is provided on at least one of the side walls on both sides and that protrudes toward the opposing side wall and extends circumferentially, wherein the convex bead has a surface The cross-sectional shape is a mountain shape that bends and swells so as to be in contact with the flange from the side wall surfaces on both sides connected to the convex bead, and the surface shape of the flange disposed to face the side wall on which the convex bead is formed Not curved Characterized in that it has a surface shape.
According to a second aspect of the present invention, in the V band according to the first aspect, a top portion of the convex bead in contact with the flange is located at a center position that bisects a height of a side wall on which the convex bead is formed. It is characterized by being located on the bottom side of the groove.
According to a third aspect of the present invention, in the V band according to the first or second aspect , the convex bead has a cross-sectional shape curved so as to be convex toward the opposite side wall. I do.

According to this, since the convex bead is formed on the side wall of the groove of the band portion, when the flange is sandwiched, the spring effect of the convex bead acts on the flange, and the spring effect locally generates on the flange. Power is absorbed. Therefore, the flanges of the pair of tubular bodies can bite into the groove without hitting each other at both ends of the band portion, so that the pair of tubular bodies can be easily and reliably connected, and the tightening property is improved. Can be improved. In addition, since the cross-sectional shape of the groove has a tapered shape that expands from the bottom, the pair of flanges can be more easily and reliably cut into the groove without hitting each other.

According to a fourth aspect of the present invention, in the V band according to any one of the first to third aspects, the convex bead is provided between the pair of flange portions in a state where the V band is attached to the pair of flanges. Is formed so as to have substantially the same diameter as the ring-shaped seal member interposed therebetween.

  According to this, since the convex bead is formed at a position corresponding to the ring-shaped seal member interposed between the pair of flanges, the seal member can be effectively crushed. Thereby, the tightening property can be easily improved so that the surface pressure acting on the seal member becomes uniform.

According to a fifth aspect of the present invention, in the V band according to any one of the first to fourth aspects, the at least one side wall provided with the convex bead has a wall thickness of a portion having the convex bead other than the other. It is characterized by being thinner than the part.

  According to this, since the wall thickness of the portion having the convex bead is thinner than the other portions, the spring effect by the convex bead can be more exerted, and the tightening property can be further improved.

According to a sixth aspect of the present invention, in the V band according to any one of the first to fifth aspects, the convex beads are formed on the side walls on both sides.

  According to this, since the convex beads are formed on the side walls on both sides of the groove, a spring effect by the convex beads acts on the pair of flanges from both sides in the tightening direction. Therefore, the tightening property can be further improved.

The invention according to claim 7 is the V band according to any one of claims 1 to 6 , wherein the band portion includes a first band member, a second band member, and the first band member. And a coupling mechanism coupled to one end of each of the second band members to rotatably couple the first band member and the second band member.

  According to this, the band portion includes the first band member and the second band member rotatably connected by the connection mechanism. Therefore, in connecting the pair of tubular bodies, the first band member and the second band member can be easily opened and arranged so as to surround the flanges of the pair of tubular bodies. Efficiency can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, a pair of tubular bodies can be easily and reliably connected, and it becomes possible to provide the V band which can improve a tightening property.

It is a perspective view showing composition of an important section of a V band concerning one embodiment. FIGS. 2A and 2B are partial cross-sectional views of a groove along a moving direction of a first band member by tightening a V-band in FIG. 1, wherein FIG. It is a width direction sectional view of a groove. FIG. 2 is a partially enlarged cross-sectional view of a pair of tubular bodies connected by a V band in FIG. 1. It is a perspective view of a V band. FIG. 5 is a partially enlarged cross-sectional view of a pair of tubular bodies connected by a V band in FIG. 4. (A)-(d) is a figure which shows the connection procedure of a pair of tubular body by the V band of FIG. FIG. 5 is a diagram illustrating a moving direction of a first band member by tightening a V band in FIG. 4. 7A is a partial sectional view taken along line AA, and FIG. 7B is a sectional view taken along line BB. FIG. 5 is a diagram for explaining a surface pressure state of a seal member by tightening a V band in FIG. 4.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration of a main part of a V band according to an embodiment of the present invention. FIG. 1 also shows a pair of tubular bodies to be connected by a V-band. V band 10 according to the present embodiment has the same configuration as V band 50 shown in FIG. That is, the V band 10 includes the arc-shaped band portion 20. The band portion 20 is connected to the first band member 21 and the second band member 22 and to one end of each of the first band member 21 and the second band member 22 so as to form the first band member 21. And a connection mechanism 23 for connecting the second band member 22 to each other so as to be freely rotatable.

  The connection mechanism 23 is provided with locking members 24 and 25 connected to one ends of the first band member 21 and the second band member 22, respectively, and rotatably connects the locking members 24 and 25 to each other. And a link member 26 to be provided.

  Brackets 27 and 28 are connected to the other ends of the first band member 21 and the second band member 22, respectively. Holes 27a and 28a are formed in these brackets 27 and 28, and tightening bolts constituting a tightening mechanism are arranged through these holes 27a and 28a. The tightening bolt is screwed to the nut and rotated so that the other end portions of the first band member 21 and the second band member 22 approach each other, so that the band portion 20 can be tightened.

  The first band member 21 and the second band member 22 are formed with a groove 29 that opens in an arc shape from one end to the other end. The groove 29 is formed to have a trapezoidal cross-section, with the side walls 30a and 30b on both sides forming the opening tapered from the bottom 30c of the groove 29.

  In the V band 10 according to the present embodiment, the configuration of the groove 29 is different from the configuration of the groove 69 of the V band 50 shown in FIG. That is, as shown in FIGS. 2A and 2B, the groove 29 of the first band member 21 includes convex beads 31a and 31b formed on the side walls 30a and 30b, respectively. 2A shows a cross-sectional view of the first band member 21 corresponding to FIG. 8A at an intermediate portion in the circumferential direction, and FIG. 2B shows a first band member 21 corresponding to FIG. 8B. Is a sectional view of the other end of the band member 21 of FIG.

  The convex bead 31a protrudes toward the opposing side wall 30b and is formed in the circumferential direction of the first band member 21. Similarly, the convex bead 31b projects toward the opposing side wall 30a and is formed in the circumferential direction of the first band member 21. In the present embodiment, the convex beads 31a and 31b are ring-shaped sealing members interposed between the flanges 73 and 74 of the pair of tubular bodies 71 and 72 to be connected as shown in a partially enlarged sectional view in FIG. 75 is formed at a position corresponding to 75. That is, the convex beads 31a and 31b are formed with substantially the same diameter as the seal member 75. FIG. 3 is a partially enlarged sectional view corresponding to FIG.

  In addition, the side walls 30a and 30b are thin at portions having the convex beads 31a and 31b. Such a thin structure may be formed, for example, by previously thinning the thickness of the portion where the convex beads 31a and 31b are formed, or by simultaneously forming the convex beads 31a and 31b to be thin when forming the sheet by sheet metal working. Good. The groove 29 of the second band member 21 is formed similarly to the first band member 21.

  According to the V band 10 according to the present embodiment configured as described above, when the flanges 73 and 74 are tightened by the band portion 20, the flanges 73 and 74 are clamped from both sides in the tightening direction by the convex beads 31a and 31b, A spring effect is exerted on the flanges 73 and 74 by the convex beads 31a and 31b. Therefore, even if a reaction force is locally generated in the flanges 73 and 74, the reaction force is absorbed by the convex beads 31a and 31b.

  This allows the flanges 73 and 74 to bite into the groove 29 without hitting each other at both ends of the band 20, so that the pair of tubular bodies 71 and 72 can be easily and reliably connected. Tightness can also be improved. Moreover, the thickness of the side walls 30a and 30b of the groove 29 is reduced in the portion having the convex beads 31a and 31b, and the spring effect of the convex beads 31a and 31b is more exerted. .

  Further, since the convex beads 31a and 31b are formed at positions corresponding to the ring-shaped seal member 75 interposed between the pair of flanges 73 and 74, the seal member 75 can be effectively crushed, Thereby, the tightening property can be easily improved so that the surface pressure acting on the seal member 75 becomes uniform. In addition, since the groove 29 has a tapered shape whose cross-sectional shape expands from the bottom portion 30c, the pair of flanges 73 and 74 can be more easily and surely cut into the groove without hitting each other. The band portion 20 includes a first band member 21 and a second band member 22 rotatably connected by a connection mechanism 23. Therefore, in connecting the pair of tubular bodies 71 and 72, the first band member 21 and the second band member 22 are opened and easily arranged so as to surround the flanges 73 and 74 of the tubular bodies 71 and 72. It is possible to improve the efficiency of the connection work.

  It should be noted that the present invention is not limited only to the above-described embodiment, and can be variously modified without departing from the spirit of the invention. For example, only one of the convex beads 31a and 31b may be provided, and the formation position thereof is not limited to the position corresponding to the seal member 75, but may be any position in contact with the flange 73 or 74. The cross-sectional shape of the groove 29 is not limited to the tapered shape, but may be a rectangular shape. Further, as the connecting mechanism 23 and the tightening mechanism of the first band member 21 and the second band member 22, those disclosed in Patent Document 1 and other known ones can be applied. Further, the band portion 20 may be formed of a single band member in which the first band member 21 and the second band member 22 are integrated in an arc shape.

DESCRIPTION OF SYMBOLS 10 V band 20 Band part 21 1st band member 22 2nd band member 23 Connecting mechanism 29 Groove 30a, 30b Side wall 30c Bottom 31a, 31b Convex bead 71, 72 Tubular body 73, 74 Flange 75 Seal member

Claims (7)

A V-band for connecting the pair of tubular bodies by clamping a pair of flanges formed at connection end portions of the pair of tubular bodies by fastening an arc-shaped band portion,
The band portion has a groove that opens to the inside of an arc shape and sandwiches the pair of flanges,
In the groove, both side walls forming the opening are tapered from the bottom of the groove, and at least one of the side walls protrudes toward the opposing side wall and extends in the circumferential direction. With a convex bead
The convex bead has a mountain shape in which the cross-sectional shape of the surface is bent so as to be in contact with the flange from the side wall surfaces on both sides continuous with the convex bead, and is arranged to face the side wall on which the convex bead is formed. A V-band having a curved surface shape that does not conform to the surface shape of the flange to be formed. 2. The top of the convex bead that is in contact with the flange is located closer to the bottom of the groove than a central position that bisects the height of the side wall on which the convex bead is formed. V band described in 1. The convex bead, V band according to claim 1 or 2 wherein has a curved cross-sectional shape to be convex toward the opposite side walls, characterized in that. The convex bead is formed to have substantially the same diameter as a ring-shaped seal member interposed between the pair of flange portions when the V band is attached to the pair of flanges. The V band according to any one of claims 1 to 3, wherein The V-band according to any one of claims 1 to 4 , wherein at least one side wall including the convex bead has a wall thickness at a portion having the convex bead thinner than other portions. The V-band according to any one of claims 1 to 5 , wherein the convex beads are formed on the side walls on both sides.   The band portion is coupled to one end of each of a first band member and a second band member, and the first band member and the second band member. The V band according to any one of claims 1 to 6, further comprising: a connecting mechanism that rotatably connects the two band members.

Images