JP5976556B2 - Spiral duct deformation tool and spiral duct deformation method - Google Patents

Description

  The present invention relates to a spiral duct deformation tool for deforming a cylindrical spiral duct made of a cylindrical shape and compressed in the axial direction, and a spiral duct deformation method for deforming a spiral duct using the spiral duct deformation tool. It is.

  When piping a duct with a circular cross-section on the ceiling or the like of a building for intake or exhaust, if the beam on the ceiling is obstructed and the duct cannot be passed, the height is larger than the outer diameter of the duct. It is known that a duct joiner that is formed to be small is used to avoid the obstacle and pipe the duct (see Patent Document 1). However, when such a duct joiner is used, not only the number of members required for duct piping is increased, but also an operation of connecting the duct and the duct joiner is required, which is troublesome.

  By the way, there are various types of ducts having a circular cross-section, and among them, a thin metal such as an aluminum thin plate is wound in a cylindrical shape, and a spiral rib is provided on the peripheral surface so that it can expand and contract in the axial direction. There is a spiral duct (see Patent Document 2). Such spiral ducts can also be deformed by hand, and because of obstacles such as beams, even in places where the duct cannot be passed if it remains circular, the cross-sectional shape is flattened such as an ellipse. It is possible to pass through by deforming into a shape.

Japanese Patent Laid-Open No. 2005-9719 No. 3-17105

  However, when the spiral duct described in Patent Document 2 is deformed by hand or the like, it is difficult to be deformed neatly by pressing it in the radial direction and compressing it in a large manner, and it has a uniform cross-sectional shape. Therefore, pressure loss in the air flow may be caused. In particular, when a spiral duct is passed through a small space around an obstacle such as a beam after the ceiling is constructed, it may be necessary to deform the spiral duct over a long length. It is very difficult to uniformly deform it into a desired cross-sectional shape. Further, when the deformation / correction is repeated several times so as to obtain a desired shape, the spiral duct is made of a thin metal and fragile, so that the spiral duct may be damaged due to tearing or tearing.

  It should be noted that a spiral duct that can be expanded and contracted in the axial direction is compressed in the radial direction after being compressed in the axial direction and then expanded in the axial direction because the spiral ribs are closely connected in the radial direction. It is difficult to compress itself, and since it is twisted when it is extended, the flat shape and the orientation change, which is difficult. Therefore, deformation of this type of spiral duct has been limited to that which is compressed and flattened in the radial direction in a state where the spiral duct is extended in the axial direction.

  The present invention has been made in view of the above circumstances, and a metal spiral duct having a cylindrical shape and compressed in the axial direction is finished into a flat cylindrical shape such as an elliptical cylindrical shape with good finish, and can be easily and uniformly deformed. It is an object of the present invention to provide a spiral duct deforming tool and a spiral duct deforming method that can be used.

The spiral duct deforming tool of the present invention is for deforming a cylindrical metal spiral duct that is formed in a cylindrical shape and compressed in the axial direction into a flat cylindrical shape, and has a circular inlet port into which the spiral duct is drawn. A flat-shaped outlet from which the spiral duct is drawn out, and between the inlet and the outlet, and the cross section is gradually deformed from a circular shape to a flat shape from the inlet to the outlet. And a radial compression section for compressing the spiral duct in the radial direction. Then, radially compressed and is formed so as to deform into a flat shape by the radial compression portion while stretching the spiral duct by pulling the front Symbol spiral duct from the pull-out port side.
The spiral duct deforming tool may be formed of a split body that divides the drawing port, the drawing port, and the diameter compression portion into two in the radial direction.
Here, “flat shape” means a flat non-circular shape, but in the deformed cross-sectional shape, the vertical axis dimension in the height direction is smaller than the horizontal axis dimension in the width direction perpendicular thereto. The elliptical shape described in claim 2 is applicable, and the “flat cylindrical shape” also means a cylindrical shape having the same cross-sectional shape. For example, the elliptical shape described in claim 2 This corresponds to an elliptic cylinder.

  The spiral duct deformation method of the present invention is to deform the spiral duct into a flat cylindrical shape while extending, and at a deformation start position for deforming the cross section of the spiral duct from a circular shape to a flat shape, A duct deformation tool comprising a flat-shaped outlet and a diameter compression section that gradually deforms the cross section from a circular shape to a flat shape from the inlet to the outlet and compresses the spiral duct in the radial direction. The spiral duct is pulled from the outlet side of the duct deforming tool to the deformation end position, and is compressed in the radial direction by the radial compression portion while being elongated, and deformed into an elliptical shape.

  In the spiral duct deforming tool and the deforming method according to the present invention, the spiral duct is extended by pulling the spiral duct deformed tool in a desired position of the spiral duct and compressing the spiral duct in the axial direction from the outlet side. The cross section is deformed from a circular shape to an elliptical shape and flattened by compressing in a radial direction by a radial compression portion. At this time, since the spiral duct is gradually deformed, if the spiral duct is continuously pulled out from the outlet by a desired length, the spiral duct having a circular cross section is sequentially drawn into the inlet, and is compressed and deformed by the diameter compression portion. Thus, it can be continuously drawn out from the outlet with a uniform shape and a good finish. And since it can compress by radial direction, extending | stretching only by pulling, a spiral duct can be easily changed into desired cross-sectional shape.

  In the inventions of claims 2 and 5, since the outlet is formed in an elliptical shape, the spiral duct is easily deformed smoothly into an elliptical cylindrical shape, and a good air flow space is ensured even after the deformation. be able to.

  In the invention of claim 3, since the spiral duct deforming tool is constituted by a divided body, it can be attached to and detached from the spiral duct not only at the end of the spiral duct but also at an intermediate portion of the spiral duct. Therefore, not only can the spiral duct be deformed over the entire length from one end side to the other end side, but it can also be partially deformed from the end portion on one end side to a desired length portion or an intermediate portion.

It is explanatory drawing which shows the state which pipes a duct in the ceiling back. It is a perspective view which shows an example of the spiral duct deformation | transformation tool which concerns on this invention. It is a front view of the spiral duct deformation tool shown in FIG. FIG. 3 is a rear view of the spiral duct deforming tool shown in FIG. 2. It is explanatory drawing which shows the difference in the shape of the inlet and outlet of the spiral duct deformation tool shown in FIG. It is explanatory drawing which shows an example of the operation | work which deform | transforms a spiral duct. It is explanatory drawing which shows another example of the operation | work which deform | transforms a spiral duct. It is explanatory drawing which shows another example of the shape of the drawer outlet of the spiral duct deformation | transformation tool which concerns on this invention.

  An example as an embodiment of the spiral duct deformation tool and the deformation method according to the present invention will be described below. As shown in FIG. 1, the spiral duct deforming tool and the deforming method according to the present invention include various types of beams, water pipes, gas pipes, drain pipes and the like in the space where the spiral duct D such as the ceiling T is arranged. Since the obstacle S such as piping exists above (a), below (b), or both above and below (c), the obstacle S can be avoided when the spiral duct D cannot be piped in a circular shape. Further, the spiral duct D is deformed and flattened into a non-circular shape having a smaller height dimension than the circular shape, that is, a minor axis dimension smaller than the outer diameter of the circular spiral duct D and a larger major axis dimension. Is. In this embodiment, an elliptical cylindrical shape is illustrated as a deformed flat cylindrical shape. Here, although illustration is omitted, when there are obstacles S such as columns and various pipes on the left and right of the spiral duct D, if the spiral duct D is deformed so that the width dimension is smaller than the circular shape, It will be possible to avoid obstacles on the left and right. Hereinafter, each component will be described.

  The spiral duct D is formed by winding a thin metal such as an aluminum thin plate in a cylindrical shape and providing spiral ribs on the peripheral surface so that the spiral duct D can be expanded and contracted in the axial direction. The spiral duct D is lightweight and can be deformed by hand. The spiral duct D is compressed in the axial direction in a state before construction and has a short overall length and is compact, so it is easy to carry and saves space.

  On the other hand, as shown in FIGS. 2 to 4, the duct deformation tool 10 includes a pair of upper and lower divided bodies 20, and the spiral duct D is drawn to one end side by combining the upper and lower divided bodies 20. A circular inlet 11, an elliptical outlet 12, which is a flat shape from which the spiral duct D is drawn out to the other end, and the spiral duct D are pressed gradually between the inlet 11 and the outlet 12. Is provided with a diameter compression section 13 for compressing and deforming in the radial direction.

  The inlet 11 of the duct deforming tool 10 is formed in a circular shape, and has a diameter slightly larger than the outer diameter of the circular spiral duct D, so that the circular spiral duct D can be smoothly retracted. On the other hand, as shown in FIG. 5, the outlet 12 is a non-circular shape in which the vertical axis having a short axis dimension A is smaller than the diameter d of the inlet 11 and the horizontal axis dimension being a long axis dimension B orthogonal thereto is large. Specifically, it is formed in an elliptical shape so that the circular spiral duct D can be deformed into an elliptical shape.

  The diameter compression part 13 is a site | part which connects the inlet 11 and the outlet 12, and becomes a cross-sectional shape which changes gradually from the inlet 11 to the outlet 12, and changes smoothly. In particular, in the present embodiment, the cross sections of the drawing port 11 and the diameter compression portion 13 that continuously change in shape and the circumferential lengths of the drawing port 12 are all substantially the same. Therefore, when the circular spiral duct D drawn from the drawing port 11 is pulled from the drawing port 12 side and reaches the drawing port 12 through the diameter compression unit 13, the spiral duct D is compressed into the diameter compression unit over the entire circumference. While being constrained by 13, it is pressed and compressed in the short axis direction at the outlet 12, and deformed into a spiral duct having an elliptical cross section that matches the shape of the outlet 12.

  In this embodiment, the pair of upper and lower divided bodies 20 constituting the duct deforming tool 10 have the same shape, and have a structure that can be combined by inverting the top and bottom of one divided body 20. Here, a concave portion 21 and a convex portion 22 that are concavo-convexly fitted are provided on each abutment surface of the divided body 20, and in the present embodiment, the concave portion 21 and the convex portion 22 are tapered at one end side. The side surface is formed in a trapezoid shape with a slight inclination. However, the concave portion 21 and the convex portion 22 are not limited to this shape, and the number of each is not limited. The duct deforming tool 10 can accurately align the two divided bodies 20 by fitting the concave portions 21 and the convex portions 22 of one divided body 20 with the convex portions 22 and the concave portions 21 of the other divided body 20, respectively. It has become. And thereby, it can also prevent that the assembly | attachment direction of the upper division | segmentation body 20 is mistaken and assemble | attached in the opposite direction. In addition, since the pair of upper and lower divided bodies 20 have the same shape, only one type needs to be prepared, the member cost can be reduced, and the management of the members becomes easy. However, the upper and lower divided bodies 20 do not necessarily have the same shape.

  Further, the divided body 20 is provided with an assembly portion 23, and the two divided bodies 20 are assembled in a separable manner by the assembled portion 23, so that the duct deforming tool 10 is firmly integrated. Is done. Specifically, a buckle-shaped locking tool 24 is provided at one of the left and right corners of the divided body 20, and a latched object that is locked by the locking tool 24 is provided at the other left and right corners. A stop 25 is provided. And the assembly part 23 is comprised by these latching tools 24 and the to-be-latched part 25. FIG. After the upper and lower divided bodies 20 are positioned and matched, the locking member 24 of one divided body 20 is rotated to be locked to the locked portion 25 of the other divided body 20, thereby The divided bodies 20 can be easily combined.

  The divided body 20 is provided with a fixing portion 26. By fixing the fixing portion 26 of the lower divided body to a work panel (not shown) or the like with a fixing screw 27 or the like, the deformation work of the spiral duct D can be performed stably. In the present embodiment, the fixing portion 26 is configured by using a fixing member 28, and the fixing member 28 is detachably attached to the divided body 20 by an attachment screw 29. Therefore, by removing the fixing member 28 from the upper divided body 20 or removing the fixing member 28 from the lower divided body 20 when fixing is not necessary, unnecessary projections that protrude outward are eliminated. be able to.

  Furthermore, the divided body 20 is blow-molded into a hollow shape with a resin, is lightweight and compact, and can be easily brought into the construction site of duct piping. In the present embodiment, a cap 30 that closes the hollow internal space of the divided body 20 is provided, and the divided body 20 is made heavy by filling the inside of the divided body 20 with water or sand. I can do it. Thereby, the spiral duct D can arrange | position the duct deformation tool 10 stably, without fixing to the work panel etc. by making the division body 20 a heavy article at the time of a deformation | transformation operation | work. Further, by using the upper divided body 20 as a heavy object, not only the assembling force of the assembling portion 23 in which the upper and lower divided bodies 20 are combined, but also the weight of the upper divided body 20 is added to the spiral duct D. Can be compressed and deformed in the radial direction.

  Next, the operation | work which deform | transforms the spiral duct D using the duct deformation | transformation tool 10 of this embodiment comprised in this way is demonstrated.

  In the case of deforming a desired length from the end of the spiral duct D, as shown in FIG. 6 (a), first, the end of the spiral duct D is extended, and then the duct is connected to this end. The deformation tool 10 is attached. The end of the spiral duct D is a deformation start position. When the duct deforming tool 10 is mounted, the upper divided body 20 is repeatedly moved up and down and compressed in a state where the end of the spiral duct D is extended, and the circular spiral duct D is shaped like the radial compression section 13. Deform gradually. Note that the end of the spiral duct D is extended in advance in the state in which the spiral duct D is contracted in the axial direction, and it is difficult to compress and deform in the radial direction due to the densely continuous ribs. For this reason, when the tube is compressed in the radial direction and then expanded, a twist about the tube axis occurs, and the non-circular shape, that is, the flat shape, the orientation direction, and the inclination change.

  When the end of the spiral duct D is deformed into a shape that matches the inner surface of the diameter compression portion 13 of the duct deforming tool 10, the end of the spiral duct D is pulled from the outlet 12 with a finger as shown in FIG. The duct deforming tool 10 is attached to the end of the spiral duct D so that the end of the spiral duct D protrudes slightly from the outlet 12 so that it can be taken out. Then, the end of the spiral duct D is picked with a finger and pulled in the direction of arrow A, and the spiral duct D is pulled out from the outlet 12 by the length desired to be deformed, as shown in FIG. Since the spiral rib D is formed with a spiral rib on the outer surface, the spiral duct D is pulled out from the outlet 12 and is rotated while being rotated little by little around the tube axis, and is compressed in the radial direction. The cross section is deformed from a circular shape to an elliptical shape. At this time, since the inner surface of the diameter compression portion 13 gradually changes from a circular shape to an elliptical shape, the spiral duct D deforms smoothly without difficulty.

  Thus, if the upper and lower divided bodies 20 are separated and the duct deformation tool 10 is removed from the spiral duct D, it is deformed by a desired length from the end deformation start position to the deformation end position as shown in FIG. Spiral duct D is obtained. In order to return the deformed end portion of the spiral duct D to the original circular shape in order to connect to another spiral duct D, etc., the end portion of the spiral duct D may be pressed by hand to return to the circular shape. . Here, in this embodiment, since the spiral duct D is deformed into an elliptical shape, it is easy to return it to a circular shape.

  Next, when deforming a desired portion in the middle of the spiral duct D, as shown in FIG. 7A, first, the portion that is the starting point of deformation is extended at the deformation start position of the spiral duct D. Then, the duct deformation tool 10 is attached to this part. Here, the operation for mounting the duct deformation tool 10 and the reason for extending the spiral duct D in advance are the same as in the above example.

  When the duct deforming tool 10 is attached to the spiral duct D, as shown in FIG. 7B, the spiral duct D near the outlet 12 is gripped so as to be wrapped with a palm and pulled in the direction of arrow B, as shown in FIG. 7C. In this way, the spiral duct D is pulled out from the outlet 12 by the length to be deformed. Thereafter, when the duct deformation tool 10 is removed from the spiral duct D, as shown in FIG. 7D, a spiral duct D deformed by a desired length from the deformation start position to the deformation end position at the intermediate portion is obtained. .

Next, the operation of the duct deformation tool 10 of this embodiment and the duct deformation method using the same will be described.
According to the spiral duct deforming tool 10 and the deforming method, the duct duct tool 10 is attached to a desired portion of the spiral duct D, and the spiral duct D in a state compressed in the axial direction is pulled from the outlet 12 side. D is stretched and compressed in the radial direction by the radial compression portion 13, and the cross section is deformed from a circular shape to an elliptical shape and flattened. At this time, since the spiral duct D is gradually deformed, if the spiral duct D is continuously drawn out from the outlet 12 by a desired length, the spiral duct D having a circular cross section is sequentially drawn into the inlet 11 and the diameter compression section 13 And can be continuously drawn out from the outlet 12 in a uniform shape with good finish. And since it can compress by radial direction, extending | stretching only by pulling, a spiral duct can be easily changed into desired cross-sectional shape.

  Further, since the cross section of the inlet 11 and the diameter compression portion 13 and the circumferential lengths of the outlet 12 are all substantially the same, the circular spiral duct D is constrained by the diameter compression portion 13 over the entire circumference. Then, it is deformed into a shape following the shape of the outlet 12. Therefore, the spiral duct D can be accurately deformed.

  Further, since the outlet 12 is formed in an elliptical shape, the spiral duct D can be easily deformed smoothly into an elliptical cylinder, and a good air flow space can be secured even after the deformation.

  In addition, since the duct deformation tool 10 is constituted by a divided body, it can be attached to and detached from the spiral duct D not only at the end of the spiral duct D but also at an intermediate portion of the spiral duct D. Therefore, not only can the spiral duct D be deformed over the entire length from one end side to the other end side, but it can also be partially deformed from an end portion on one end side to a desired length portion or an intermediate portion. .

  In the above, an example of the duct deformation tool 10 and the duct deformation method according to the present invention has been described, but the present invention is not limited to the above-described example.

  For example, the shape of the outlet 12 is not limited to an elliptical shape, and as shown in FIG. 8A, an ellipse formed of parallel straight lines and semicircular arcs (A is a minor axis dimension and B is a major axis dimension). Or a rectangle having an R-shaped corner (A is the minor axis dimension and B is the major axis dimension) as shown in FIG. 8B. That is, the shape of the outlet 12 is not limited as long as the minor axis dimension is smaller than the diameter of the inlet 11 and the major axis dimension is larger than the diameter of the inlet 11.

  Further, the circumferential length of the outlet 12 is not limited to be substantially the same as the circumferential length of the inlet 11, but the circumferential length of the outlet 12 is longer than the circumferential length of the inlet 11 as shown in FIG. It may be a thing. In this case, the spiral duct D is constrained by the diameter compression portion 13 in the vertical direction and is pressed and deformed, but is not constrained in the horizontal direction, and the material of the spiral duct D itself according to the pressing in the vertical direction. Deforms freely depending on the nature of

  Further, when the spiral duct D is deformed over the entire length from one end side to the other end side, the duct deforming tool 10 is not limited to the divided body 20 as in the above-described example, but the inlet 11, the diameter compressing portion 13 and the outlet 12 may be constituted by an integral member over the entire circumference. In the case of using such a duct deforming tool 10, an end portion on one end side of the spiral duct D is inserted into the drawing port 11, this end portion is pulled out from the drawing port 12, and the other end of the spiral duct D is drawn from the drawing port 11. What is necessary is just to continue pulling the spiral duct D until it pulls out.

DESCRIPTION OF SYMBOLS 10 Duct deformation tool 11 Inlet 12 Outlet 13 Diameter compression part 20 Divided body 21 Concave part 22 Convex part 23 Assembly part 24 Locking tool 25 Locked part D Spiral duct

Claims (5)

A spiral duct deforming tool for deforming a cylindrical spiral duct made of metal and compressed in the axial direction into a flat cylindrical shape,
A circular inlet into which the spiral duct is drawn, a flat-shaped outlet from which the spiral duct is drawn out, and the inlet and the outlet, and from the inlet to the outlet. A radial compression section that gradually deforms the cross section from a circular shape to a flat shape and compresses the spiral duct in the radial direction ,
Spiral duct forming tools, characterized in that it is formed so as to deform into a flat shape by radially compressed by the radial compression portion while stretching the spiral duct by pulling the front Symbol spiral duct from the pull-out port side.
  The spiral duct deformation tool according to claim 1, wherein the flat cylindrical shape is an elliptic cylindrical shape, and the flat shape is an elliptical shape.   The spiral duct deforming tool according to claim 1 or 2, wherein the spiral duct deforming tool is formed by a divided body that divides the drawing port, the drawing port, and the diameter compression portion into two in the radial direction. A spiral duct deforming method in which a cylindrical spiral duct made of metal and compressed in the axial direction is deformed into a flat cylindrical shape while extending,
At the deformation start position where the cross section of the spiral duct is deformed from a circular shape to a flat shape, the circular inlet, the flat outlet, and the cross section from the inlet to the outlet are gradually changed from a circular shape to a flat shape. A duct deforming tool having a diameter compression part for deforming and compressing the spiral duct in a radial direction is attached,
The spiral duct is characterized in that the spiral duct is pulled from the outlet side of the duct deforming tool to a deformation end position, and is compressed into a flat shape by being compressed in the radial direction by the radial compression portion while the spiral duct is extended. Deformation method.   The spiral duct deformation method according to claim 4, wherein the flat cylindrical shape is an elliptic cylindrical shape, and the flat shape is an elliptical shape.

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