JP2016186315A - V-band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a V-band for enabling easy and reliable connection of a pair of tubular bodies to improve the fastening properties.SOLUTION: A V-band 10 has a circular band part 20 which is tightened to clamp a pair of flanges 73, 74 formed at the connection ends of a pair of tubular bodies 71, 72, respectively, so that the pair of tubular bodies 71, 72 are connected to each other. The band part 20 has a groove 29 opening to the circular inside for clamping the pair of flanges 73, 74. The groove 29 includes convex beads 31a, 31b provided on at least one of side walls 30a, 30b on both sides forming the opening while projecting toward the opposed side walls and extending across circumferentially. This enables easy and reliable connection of the pair of tubular bodies to improve the fastening properties.SELECTED DRAWING: Figure 3

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 respectively formed at connection end portions of the pair of tubular bodies by fastening the band portions.

  As a conventional V-band, for example, the one described in Patent Document 1 is known. This V-band has two half shells having a trapezoidal cross section. The two half shells are configured such that one end portions of the two half shells are pivotably connected to each other by a connecting mechanism, and the other end portions are configured to be close to and separated 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 formed at connecting ends of a pair of tubular bodies, and the two half shells are tightened by tightening bolts, whereby the pair of flanges are wedged. It becomes possible to connect a pair of tubular bodies by sandwiching them.

  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 unit 60 is coupled to the first band member 61 and the second band member 62 and one end of each of the first band member 61 and the second band member 62, so that the first band member 61 is connected. And a coupling mechanism 63 that couples the second band member 62 to each other so as to be rotatable. The connecting mechanism 63 connects the locking members 64 and 65 connected to the respective one end portions of the first band member 61 and the second band member 62, and the locking members 64 and 65 so as to be rotatable with respect to each other. A link member 66 is provided.

  Brackets 67 and 68 are connected to the other end portions 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 tightening bolts constituting a tightening mechanism are arranged through the holes 67a and 68a. The tightening bolt is capable of tightening the band portion 60 by being 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.

  The first band member 61 is formed with a groove 69 that opens in an arc from the one end to the other end. The groove 69 is formed in a trapezoidal shape with side walls 70 a and 70 b on both sides forming an opening being expanded from the bottom 70 c of the groove 69 in a tapered shape. Further, the groove 69 is formed so that the opening width, that is, the maximum opening width between the side walls 70a and 70b has the same dimension over the arcuate circumferential direction of the first band member 61, and the width of the bottom portion 70c is also circumferential. Are formed with the same dimensions. 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 arranged so as to surround the periphery of 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 are inclined surfaces 73b and 74b whose thickness is reduced toward the outer periphery on the surface opposite to the connection side end surfaces 73a and 74a. A seal member 75 made of, for example, a ring-shaped gasket is disposed between the connection side end faces 73a and 74a.

  FIGS. 6A to 6D are diagrams showing a procedure for connecting a 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 grooves 69 at the respective one end portions of the first band member 61 and the second band member 62 to which the coupling mechanism 63 is coupled. Next, as shown in FIGS. 6B and 6C, the first band member 61 and the second band are rotated by rotating the first band member 61 and the second band member 62 so as to be closed. The flanges 73 and 74 are inserted into the grooves 69 at the other end of each member 62. Thereafter, as shown in FIG. 6 (d), the first band member 61 and the second band member are tightened by using the tightening bolts and nuts (not shown) to bring the brackets 67 and 68 closer to each other and tighten the band portion 60. The flanges 73 and 74 are made to enter the entire 62 groove 69.

  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 and 74 are engaged. Enters into the groove 69. As a result, the flanges 73 and 74 are displaced in a direction approaching each other as indicated by arrows B and C by the wedge action, and are tightly held via the seal member 75. In this way, the pair of tubular bodies 71 and 72 are connected to each other. FIG. 5 shows a cross-sectional view taken along the line DD of FIG.

JP 2014-25582 A

  However, as a result of intensive studies by the present inventors, it has been found that the V band 50 as shown in FIG. 4 has the following points to be improved. 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, when the cross section in the width direction of the opening of the groove 69 along the moving direction is viewed, the cross section along the line AA located in the middle portion of the first band member 61 in the circumferential direction is as shown in FIG. Thus, the cross section taken along the line BB located at the other end to which the tightening mechanism is coupled is as shown in FIG.

  As is clear from FIGS. 8A and 8B, the lengths of the side walls 70a and 70b forming the groove 69 from the bottom 70c are longer than those in the intermediate portion shown in FIG. 8A. The other end shown in FIG. 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 portion. Even at one end where the coupling mechanism 63 is coupled, the cross-sectional shape of the groove 69 is more acute than the middle, although not as much as the other end.

  Therefore, when the band portion 60 is tightened, 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, and predetermined tightening may be difficult. Further, if it is tightened forcibly, the first band member 61 may be plastically deformed. Although not shown, the same applies to the second band member 62.

  Even if the predetermined tightening can be achieved, the cross-sectional shape of the groove 69 (the taper angle of the side walls 70a and 70b) along the moving direction of the first band member 61 and the second band member 62 is as described above. Therefore, local contact of the first band member 61 and the second band member 62 occurs at the flanges 73 and 74. Therefore, the surface pressure acting on the seal member 75 is low in the regions corresponding to the intermediate portions of the first band member 61 and the second band member 62, as shown by hatching in FIG. The region corresponding to is slightly higher, the region corresponding to the other end is higher, and so on, resulting in non-uniformity in the circumferential direction and lowering of tightening performance. In FIG. 9, the surface pressure acting on the seal member 75 is indicated by the density of the dots, and the surface pressure is higher as the dots are denser.

  Such a problem also occurs in the V band disclosed in Patent Document 1. The same occurs even in the case where the band portion is a V-band made of one band member.

  This invention is made | formed in view of this point, The objective is to provide a V band which can connect a pair of tubular bodies easily and reliably, and can improve tightening property.

  The V-band invention according to claim 1, which achieves the above object, includes a pair of flanges formed on the connecting end portions of the pair of tubular bodies, and the pair of tubular bodies sandwiched by fastening the arc-shaped band portions. The band portion has a groove that opens in an arcuate shape to sandwich the pair of flanges, and the groove has at least side walls on both sides that form the opening. On the other hand, a convex bead that protrudes toward the opposite side wall and extends in the circumferential direction is provided.

  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 by the convex bead acts on the flange, and this spring effect causes the reaction locally generated in the flange. Power is absorbed. Accordingly, since the flanges of the pair of tubular bodies can bite into the grooves without being in contact with each other at both ends of the band portion, the pair of tubular bodies can be easily and reliably connected and tightened. Can be improved.

  According to a second aspect of the present invention, in the V-band according to the first aspect, the convex bead is formed at a position corresponding to a ring-shaped seal member interposed between a pair of flanges. And

  According to this, since the convex bead is formed at a position corresponding to the ring-shaped sealing member interposed between the pair of flanges, the sealing member can be effectively crushed. This makes it possible to easily improve the tightening performance so that the surface pressure acting on the seal member becomes uniform.

  The invention according to claim 3 is the V band according to claim 1 or 2, wherein the at least one side wall including the convex bead has a wall thickness of a portion having the convex bead thinner than the other portion. It is characterized by that.

  According to this, since the wall thickness of the part which has a convex bead is thinner than another part, the spring effect by a convex bead can be exhibited more, and it becomes possible to improve clamping | tightening property more.

  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 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, the spring effect by the convex beads acts on the pair of flanges from both sides in the tightening direction. Therefore, it is possible to further improve the tightening performance.

  According to a fifth aspect of the present invention, in the V-band according to any one of the first to fourth aspects, the groove is formed by expanding the side walls on both sides in a tapered shape from the bottom of the groove. It is characterized by.

  According to this, since the cross-sectional shape of the groove has a taper shape expanding from the bottom, it becomes possible to bite into the groove more easily and reliably without hitting the pair of flanges.

  The invention according to claim 6 is the V-band according to any one of claims 1 to 5, 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 pivotally connect the first band member and the second band member.

  According to this, a band part consists of a 1st band member and a 2nd band member connected rotatably by the connection mechanism. Therefore, when connecting the pair of tubular bodies, the first band member and the second band member can be opened and easily disposed so as to surround the flanges of the pair of tubular bodies. Efficiency can be improved.

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

It is a perspective view which shows the structure of the principal part of the V band which concerns on one embodiment. FIG. 2 is a partial cross-sectional view of a groove along the moving direction of the first band member by tightening the V-band of FIG. 1, (a) is a cross-sectional view in the width direction of the intermediate groove, and (b) is the other end portion It is sectional drawing of the width direction of a groove | channel. It is a partial expanded sectional view of a pair of tubular body connected by the V band of FIG. It is a perspective view of V band. It is a partial expanded sectional view of a pair of tubular body connected by the V band of FIG. (A)-(d) is a figure which shows the connection procedure of a pair of tubular body by the V band of FIG. It is a figure which shows the moving direction of the 1st band member by fastening of the V band of FIG. FIGS. 7A and 7B are partial cross-sectional views of FIG. 7, where FIG. 7A is a cross-sectional view taken along line AA, and FIG. 7B is a cross-sectional view taken along line BB. It is a figure for demonstrating the surface pressure state of the sealing member by fastening of the V band of FIG.

  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 the V band. The V band 10 according to the present embodiment has the same configuration as the V band 50 shown in FIG. That is, the V band 10 includes an arc-shaped band portion 20. The band unit 20 is coupled to the first band member 21 and the second band member 22, and one end of each of the first band member 21 and the second band member 22. And a connecting mechanism 23 for connecting the second band member 22 to each other so as to be rotatable.

  The connection mechanism 23 connects the locking members 24 and 25 connected to the respective one end portions of the first band member 21 and the second band member 22 and the locking members 24 and 25 so as to be rotatable with respect to each other. The link member 26 is provided.

  Further, brackets 27 and 28 are connected to the other end portions of the first band member 21 and the second band member 22, respectively. Holes 27a and 28a are formed in the brackets 27 and 28, and tightening bolts constituting a tightening mechanism are arranged through the holes 27a and 28a. The tightening bolt is capable of tightening the band portion 20 by being screwed into the nut and rotated so that the other end portions of the first band member 21 and the second band member 22 are brought close to each other.

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

  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 is a cross-sectional view of the first band member 21 corresponding to FIG. 8A in the circumferential intermediate portion, and FIG. 2B is a first view corresponding to FIG. 8B. Sectional drawing in the other end part of the band member 21 of this is shown.

  The convex bead 31 a protrudes toward the opposite side wall 30 b and is formed over the circumferential direction of the first band member 21. Similarly, the convex bead 31 b protrudes toward the opposing side wall 30 a and is formed over the circumferential direction of the first band member 21. In the present embodiment, convex beads 31a and 31b are ring-shaped sealing members interposed between flanges 73 and 74 of a 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 31 a and 31 b are formed with substantially the same diameter as the seal member 75. FIG. 3 shows a partially enlarged sectional view corresponding to FIG.

  Further, the side walls 30a and 30b are thin in the portions having the convex beads 31a and 31b. In such a thin structure, for example, the plate thickness of the portions where the convex beads 31a and 31b are formed may be previously thinned, or the convex beads 31a and 31b may be formed thin at the same time when formed by sheet metal processing. Good. The groove 29 of the second band member 21 is also formed in the same manner as 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 sandwiched from both sides in the tightening direction by the convex beads 31a and 31b. A spring effect by the convex beads 31a and 31b acts on the flanges 73 and 74. 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.

  As a result, the flanges 73 and 74 can bite into the groove 29 at the both end portions of the band portion 20 without coming into contact with each other, so that the pair of tubular bodies 71 and 72 can be easily and reliably connected. Tightness can also be improved. In addition, the side walls 30a and 30b of the groove 29 are thin in the portion having the convex beads 31a and 31b, and the spring effect of the convex beads 31a and 31b is more exhibited, so that the effect becomes more remarkable. .

  Moreover, since the convex beads 31a and 31b are formed at positions corresponding to the ring-shaped sealing member 75 interposed between the pair of flanges 73 and 74, the sealing member 75 can be crushed effectively, This makes it possible to easily improve the tightening performance 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 30c, the pair of flanges 73 and 74 can be easily and reliably bitten into the groove without hitting each other. The band unit 20 includes a first band member 21 and a second band member 22 that are rotatably connected by a connecting mechanism 23. Therefore, when connecting the pair of tubular bodies 71 and 72, the first band member 21 and the second band member 22 are opened and easily disposed so as to surround the flanges 73 and 74 of the tubular bodies 71 and 72. This makes it possible to improve the efficiency of the connection work.

  In addition, this invention is not limited only to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, only one of the convex beads 31 a and 31 b may be used, and the formation position is not limited to the position corresponding to the seal member 75, but can be any position in contact with the flange 73 or 74. Further, the cross-sectional shape of the groove 29 is not limited to the tapered shape, and may be a rectangular shape. Further, the connection mechanism 23 and the tightening mechanism of the first band member 21 and the second band member 22 may be those disclosed in Patent Document 1 or other known ones. Furthermore, the band portion 20 may be composed 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 Connection mechanism 29 Groove 30a, 30b Side wall 30c Bottom part 31a, 31b Convex bead 71, 72 Tubular body 73, 74 Flange 75 Seal member

Claims (6)

A V band for connecting the pair of tubular bodies by sandwiching a pair of flanges respectively formed at connection end portions of the pair of tubular bodies by fastening the arc-shaped band portions;
The band portion has a groove that opens to the inside of an arc shape and sandwiches the pair of flanges;
The groove is provided with a convex bead that protrudes toward an opposite side wall and extends in a circumferential direction on at least one of both side walls forming the opening.   The V-band according to claim 1, wherein the convex bead is formed at a position corresponding to a ring-shaped seal member interposed between a pair of flanges.   3. The V-band according to claim 1, wherein the at least one side wall including the convex bead has a wall thickness of a portion having the convex bead smaller than that of the other portion.   The V band according to claim 1, wherein the convex beads are formed on the side walls on both sides.   The V-band according to any one of claims 1 to 4, wherein the groove is formed such that side walls on both sides expand in a tapered shape from a bottom of the groove. The band part is
A first band member and a second band member;
A coupling mechanism coupled to one end of each of the first band member and the second band member and pivotally coupling the first band member and the second band member; The V band according to any one of claims 1 to 5, wherein

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