JP2009228957A - Nipple connection method for corrugated fiberboard made duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection method for an easily constructible corrugated fiberboard made duct with superior appearance in an installed state, and providing high airtightness. <P>SOLUTION: In the connection method for the corrugated fiberboard made duct connecting ducts D joined by prismatically bending a blank of the corrugated fiberboard and positioning a joint flap part inward, a corrugation crushing part 7 of crushing the corrugated fiberboard in a thickness direction is provided on the flap joint part 6 of the duct D facing a connection end, angular ring shaped nipples J are inserted into ends of both ducts D within a range of the corrugation crushing part 7, the ducts D are abutted on each other, and an adhesive tape 17 is wound on an outer circumference of the abutting part of the ducts D. The ducts D are installed in a clean-cut appearance without showing the flap joint part 6 and a socket for connection on an outer face. Since sealing is carried out by winding the adhesive tap 17 on the outer circumference of the abutting part of the ducts D having almost no difference in level, working efficiency is favorable and high airtightness is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for connecting corrugated cardboard ducts that are installed for air conditioning, ventilation, or the like by connecting ducts in which a blank made of corrugated cardboard is bent into a rectangular tube shape.

  In recent years, corrugated cardboard ducts have attracted attention because they are lightweight, have excellent workability and heat insulation properties, and can be easily discarded when removed. As an example of such a duct, Patent Document 1 described below describes a corrugated cardboard blank that is bent into a rectangular tube shape and joined with the passage portion outside.

  And as a connecting method of this duct, the ducts are butted together, an auxiliary plate that eliminates the step of the passage part is pasted on the outer surface of the duct, and an adhesive tape is wound around the outer periphery of the duct butt part to ensure airtightness However, what connects ducts is described.

  Further, in Patent Document 2 below, a blank in which corrugated cardboard is coated with aluminum foil is bent into a rectangular tube shape, and a joint portion is overlapped on the inside of one surface and fixed by a fastening pin, and the outside of the joint portion. A duct sealed with aluminum tape has been proposed.

  In this duct, the level difference due to the passage is located on the inner surface of the duct. What couple | bonds a duct and a socket is illustrated.

  Moreover, the example which inserts a square-shaped metal nipple in the edge part of both ducts, and connects ducts is also shown.

Japanese Patent Laying-Open No. 2006-29681 (FIGS. 1 to 3) JP 2007-147185 A (FIGS. 7 and 13)

  However, since the corrugated duct is generally used without the heat insulation work covered with the heat insulating material and the cover, in the duct connecting method described in Patent Document 1, the step of the passage portion and the auxiliary plate appearing on the outer surface Has the problem of giving an unsightly impression.

  In addition, in the connection method using the socket described in Patent Document 2, the socket that appears intermittently on the outer surface impairs the aesthetics, and there is a step in the passage portion on the inner surface of the duct, so the ducts are connected with a normal nipple. Even if it tries to do so, there is a problem that a gap is formed between the duct and the nipple, and the adhesive tape for sealing is difficult to stick.

  Accordingly, an object of the present invention is to provide a method for connecting a corrugated cardboard duct, which is excellent in aesthetics in an installed state, obtains high airtightness, and is easy to construct.

  In order to solve the above-mentioned problem, the present invention is a method for connecting ducts made of corrugated cardboard, in which a duct made by bending a corrugated cardboard blank into a square tube and connecting the ducts with the joint part inside, Corrugated parts are crushed in the thickness direction and faced to the connection ends. Square annular nipples are inserted at the ends of both ducts within the range of the stepped parts, and the ducts are butted together. An adhesive tape for sealing is wound around the outer periphery of the tape.

  In this corrugated cardboard duct connection method, pin holes are provided in the corners of the upper and lower surfaces of the duct and nipple, and fastening pins are inserted into these matching pin holes to fix the duct and nipple. is there.

  Further, the inner dimension of the duct in the horizontal direction is set to be larger than the outer dimension of the nipple in the horizontal direction, and the nipple is inserted into the duct while shaking the duct from side to side.

  In the method for connecting corrugated cardboard ducts according to the present invention, the passage portion of the duct is positioned on the inner surface side, and the end portion of both ducts is within the range of the corrugated portion obtained by crushing the passage portion to reduce the thickness. Since the nipple is inserted and connected, the gap between the duct and the nipple is suppressed, the passage portion and the socket do not appear on the outer surface, and the duct can be installed with a clean appearance.

  In addition, the adhesive tape is wrapped around the outer periphery of the butt portion of the duct where there is almost no step, so that it is easy to work and high airtightness is obtained, and there is no need to make a nipple with a special shape, resulting in excessive costs. It will not take.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIG. 1, the straight tube corrugated duct D connected by this method is a rectangular tube-like one installed for air conditioning. For example, the inner dimension is 400 mm × 300 mm and the length is 1500 mm. It is set to be.

  As shown in FIG. 2, the blank constituting the duct D is formed by laminating an aluminum foil 2 on both sides of a double-sided cardboard 1 via an adhesive, for example, polyethylene which is a thermoplastic resin. A material coated with a heat resistant paint such as a nitrocellulose resin varnish is used. The peripheral edge of the cardboard 1 is sealed with an aluminum tape 3 in order to ensure incombustibility and heat insulation.

  In this blank, a pair of flat plate portions 5a and side plate portions 5b are alternately formed via ruled lines 4 orthogonal to the steps of the corrugated cardboard 1, and a passage portion 6 connected to one flat plate portion 5a is formed. ing. Here, the corrugation means a corrugated corrugation of the corrugated cardboard, and the corrugation direction is represented by the direction in which the corrugation of the corrugation extends.

  The passage portion 6 is provided with a crushed portion 7 that is formed by crushed the center of the corrugated cardboard in the thickness direction so as to face both ends. The crushing portion 7 is formed by pressing with a roller or the like, and extends in a range of about 100 mm inward from both ends. In addition, the thickness of the corrugated board in the squashed portion 7 is set such that, for example, when the thickness of the corrugated board before processing is 8 mm, the thickness after squashing is about 3 mm.

  Pin holes 8 are provided in the edge portions of the passage portion 6 and the side plate portion 5b on the opposite side, and pin holes 9 are provided in each corner portion of the flat plate portion 5a. The pin holes 9 are positioned at locations separated by about 50 mm from the edge of the flat plate portion 5a and the ridge line with the adjacent side plate portion 5b.

  In order to assemble the blank as described above into the duct D, as shown in FIG. 1, the blank is bent along the ruled line 4 so that the flat plate portion 5a forms upper and lower horizontal surfaces and the side plate portions 5b form vertical surfaces on both sides. The double-sided adhesive tape and the fastening pin 10 inserted into the pin hole 8 are overlapped and joined to the side plate portion 5 b opposite to the joint portion 6, and the outside of the joint is sealed with the aluminum tape 11.

  In order to connect such ducts D, a metal square annular nipple J is prepared as shown in FIG.

  In this example, the nipple J has an axial length of 150 mm, and a peripheral wall is formed from a flat plate portion 12a that forms upper and lower horizontal planes and side plate portions 12b that form vertical surfaces on both sides. It has the bending part 13 to the diagonal inner side used as a guide. A pin hole 14 is provided at each corner of the flat plate portion 12a of the nipple J, and a duct positioning auxiliary line 15 is written at the center of the surface of the flat plate portion 12a.

  In the connection work, as shown in FIG. 4, the nipple J is inserted into one duct D within the range of the stepped portion 7, the fastening pins 16 are inserted into the matching pin holes 9 and 14, The duct D is fixed. At this time, the nipple J can easily determine the insertion depth into the duct D using the auxiliary line 15 as a mark.

  Next, as shown in FIG. 5, the nipple J is inserted into the other duct D within the range of the stepped portion 7 in the same manner as the one duct D, the ducts D are butted together, and the pin holes 9, 14 matched. The fastening pin 16 is inserted into the nipple J, and the nipple J and the other duct D are fixed.

  Thereafter, as shown in FIG. 6, the adhesive tape 17 is wound around the outer periphery of the abutting portion of the duct D to seal the abutting portion, and the head of the fastening pin 16 and the periphery thereof are covered with an adhesive tape 17 such as an aluminum tape. The gap between the pin hole 9 and the fastening pin 16 is sealed.

  Here, as the fastening pin 16, the hole frame member fitted in the pin holes 9, 14 is tightened as the fastening member rotates, in addition to the fastening pins 16 which are expanded in diameter by being pushed in and are prevented from coming off from the pin holes 9, 14. It is desirable to use a thing that can be fixed from the outside of the duct D.

  In the connecting portion between the ducts D as described above, the pin holes 9 and 14 are located at the corners of the flat plate portions 5a and 12a that are the upper and lower surfaces of the duct D and the nipple J, so that the fastening pin 16 is pushed in. Even if the diameter of the duct is increased, the flat plate portions 5a and 12a are not easily bent as the fastening pin 16 is pushed in, and the fastening pin 16 can be easily prevented from being pulled out. Also become stronger.

Further, as shown in FIG. 7, the inside dimension W ₁ in the horizontal direction of the end portion of the duct D, if you set larger than the horizontal outer dimensions W ₂ nipple J, upon connection operation, the duct D The nipple J can be easily inserted into the duct D while shaking left and right.

  On the other hand, it is desirable that the vertical dimension of the duct D be substantially the same as the vertical dimension of the nipple J in order to prevent vertical bending at the connecting portion between the ducts D.

  In the above embodiment, a case where straight pipes D are connected to each other is illustrated. However, as shown in FIG. 8, this method uses a duct at each connection port of a T-shaped pipe T which branches a flow path. Even in the case of connecting the duct of the odd-shaped pipe and another duct, such as when connecting D, any duct can be applied as long as the passage portion 6 is located on the inner surface side.

The perspective view of the duct connected by the method concerning this invention Figure showing the same blank as above The perspective view which shows the state before the connection of a duct and a nipple same as the above. The perspective view which shows the insertion state of the nipple to one duct same as the above The perspective view which shows the connection process of the ducts by the nipple same as the above The perspective view which shows the connection state of ducts by a nipple same as the above Cross-sectional plan view showing how to insert a nipple into the duct The perspective view which shows the example of application to the duct of a variant pipe same as the above

Explanation of symbols

D Duct 1 Corrugated board 2 Aluminum foil 3 Aluminum tape 4 Ruled line 5a Flat plate part 5b Side plate part 6 Joint part 7 Step crushing part 8, 9 Pin hole 10 Fastening pin 11 Aluminum tape J Nipple 12a Flat plate part 12b Side plate part 13 Bent part 14 Pin hole 15 Auxiliary wire 16 Fastening pin 17 Adhesive tape

Claims (3)

  In a method of connecting corrugated cardboard ducts in which corrugated cardboard blanks are folded into a rectangular tube and the ducts are joined with the passages inside, the corrugated board is crushed in the thickness direction in the duct passages Place the part facing the connection end, insert a rectangular nipple at the end of both ducts within the range of the stepped part, butt the ducts, and wrap the adhesive tape for sealing around the outer periphery of the butt part of the duct A nipple connection method for a corrugated cardboard duct.   2. The method for connecting nipples of corrugated cardboard ducts according to claim 1, wherein pin holes are provided at corners of the upper and lower surfaces of the duct and the nipples, and fastening pins are inserted into these matching pin holes to fix the duct and the nipple. A nipple connection method for a corrugated cardboard duct.   The nipple connecting method for a corrugated cardboard duct according to claim 1 or 2, wherein the inner dimension of the duct in the horizontal direction is set larger than the outer dimension of the nipple in the horizontal direction, and the nipple is moved while shaking the duct left and right. A method for connecting nipples in a corrugated cardboard duct, characterized by being inserted into the duct.

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