JPS5977189A - Method of connecting duct - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION There are four methods for connecting ducts with irregularities on their outer surfaces, such as wood 4n'jl it snowboard ducts and 7 lexiplug ducts.

Conventionally, ducts with irregularities on their outer surfaces, such as spiral ducts and flexible ducts, have been used to cool buildings. 11jj1 It is widely used for ventilation, ventilation, dust collection, etc., and the connection is by applying adhesive to the outer surface of one duct, inserting it into the other duct, and gluing it. A method of fixing the duct to the duct with screws and covering the connection part with adhesive tape, forming the end of the duct into a rig shape, step shape, etc., pushing one end directly into the other end, and then using a band or clamp. Methods such as tightening with etc. are adopted.

However, with the above method, the connection part may not be completely sealed because the duct has unevenness, and even if it is completely sealed at the beginning of connection, the seal may become insufficient due to vibration of the duct, rust due to condensation, etc. However, there was a drawback that the gas inside the duct could leak. Further, there were disadvantages such as the humidity in the building being difficult to control due to gas leakage, and noise being generated from the ducts.

In view of the above-mentioned drawbacks, the present invention has been made to provide a connection method that can completely seal the connection part so that the gas inside the duct does not leak from the connection part when connecting ducts having uneven surfaces. The gist of this is that when connecting a duct with an uneven outer surface, an adhesive layer having a thickness equal to or greater than the difference in level between the convex part and the four parts of the duct is attached to the inner surface of the duct.
1 to ii'? The method of connecting a duct is characterized in that a heat-shrinkable quill or striped tube is coated on the connection part of the duct described in -1- and then heated and shrunk.

The duct used for wooden pipes has a textured metal on the outer surface, such as a quick-lead steel plate, and the R5 wire is on the inside).
Examples include spiral ducts and flexible ducts made of synthetic resin plates such as polyvinyl chloride resin and nylon.

The heat-shrinkable film or tube used in the present invention only needs to have heat-shrinkability, and any conventionally known film or tube can be used. DI is preferred, and a stretched polyethylene film or tube is preferred. In addition, it is preferable that the number of questions is 2 or less, since it is preferable that the size of 17 has excellent heat conductivity so that the adhesive adheres well to the unevenness of the LFI K Dag 1 to be heat-shrinked, and the adhesive is given fluidity by heat. More preferably α2 to LOWn.

The adhesive used in the present invention can be any known adhesive, including pressure-sensitive adhesives that can be used for positioning and temporary bonding at work sites, and true-melt adhesives that become more fluid when heated and easily adapt to uneven surfaces. A petrolatum-based anticorrosive composition that imparts anticorrosive properties to the duct is preferably used.

Examples of the above-mentioned pressure-sensitive adhesives include rubber-based and acrylic-based adhesives2, and when heat resistance is required, acrylic-based adhesives are preferred; Tackifiers such as phenol resins, naphthenic mineral oils, machine oils, softeners such as low-molecular polyligtenes, and inorganic fillers such as lucium carbonate and clay may be added.

Examples of the above-mentioned hot-melt adhesive include ethylene-vinyl acetate copolymer, polyamide, etc., and the above-mentioned tackifier, softener, inorganic filler, etc. may also be added to the adhesive.

In addition, the above-mentioned anticorrosion composition based on betrocum is mainly composed of petrolatum or petrolatum oxide, and contains gum,
Zinc oxide, the above-mentioned inorganic fillers, etc. may be added.

In Kippatsu ll11, the adhesive #'1ntt is laminated on the inner surface of the heat-shrinkable film or tube. It is sufficient that the layers are stacked so that 6"N f
Any method may be used as the fi method, and the adhesive layer may be provided on the entire surface of the heat-shrinkable film or the tube, or only on the same side of the heat-shrinkable film or duplex. may be provided.

The method for connecting wood starting point 1 is to attach the heat-shrinkable film or tube laminated to the inner surface of the duct so that the adhesive described in n11 has a thickness equal to or greater than the height difference between the convex part and the four parts of the duct to be connected. This is done by applying afU to the connection part of the tube and then heating it to shrink the heat-shrinkable film or tube.Heating methods include heating with a gas burner, heating with an electric heater, and blowing hot air. Any method such as heating may be employed.

The above-mentioned ducts may be connected by simply abutting the ends of the ducts, or by using sockets, esters, screws, etc.

Further, in order to remove the pressure when a sharp step occurs at the connection part, it is preferable to fill the step with a filler to smooth the step, cover the above-mentioned heat-shrinkable film or tube, and heat-shrink the connection.

Next, the state in which the ducts are connected by the connection method of the present invention will be explained with reference to the drawings. FIG. 1 is a partial sectional view showing a state in which two spikele ducts are connected by the connection method of the present invention.

In the figure, reference numeral 1.1' is a spiral duct, which has ridges 11 and 11' formed on its outer surface, and inwardly bent mouthpieces 12 and 12' formed at its ends. . 2
tj: Ester, both ends of which are inserted into the mouthpiece 12.12' and connected to the spiral duct 1°1'. 3 is a heat-shrinkable film provided with an adhesive layer 4 having a thickness of 1γ over the entire surface, which is equal to or larger than the level difference between the seams 11 and 11', and is coated on the connecting part of the ducts 1 and 1', and is heat-shrinked. Ducts 1 and 1' are connected to I1. It is being done.

In addition, the adhesive is given fluidity by heating and -1 (
- It is pressed by the shrinking force of the shrinkable film and is filled between the mouthpiece 12, 12' and the nipple 20 of the spiral duct t, ffi.

The configuration of the duct connection method of the present invention is as described above,
The thickness of the contact agent layer is equal to or greater than the difference between the convex part and the four parts of the duct.
Therefore, it is possible to uniformly bond the entire side of the connecting portion without being disturbed by the step of the duct, and the duct can be connected with the connecting portion completely sealed. Therefore, if the ducts are connected using the connection method of 1j11, no gas will leak from the connection, no noise will be generated, and the temperature control and situation inside the building will be improved. , Section 1 can be performed efficiently and reliably. Furthermore, the connection can be easily made because the connection is made by coloring a heat-shrinkable film or tube provided with an adhesive layer and then heat-shrinking it.

Next, the present invention will be explained with reference to examples.

Example 1 A nipple for a 250 round duct was inserted into the end of a spiral duct made of two wooden galvanized steel plates (250 m in diameter, 15 mm in height at one end) and connected, and the entire inner surface was coated with gutil rubber with a thickness of L6. ν value provided with adhesive layer 0.4 mm%
A cross-linked polyethylene heat-shrinkable film having a diameter of 100 mm was wrapped around the above connection portion so that the ends overlapped by 70 degrees. Next, the overlapped parts were heated with a propane gas parka to bond them, and then the other parts were heated to shrink and connect. The time it took to connect was 4 minutes and 40 seconds.

Next, one end of the connected spiral duct was sealed, water was injected from the other end to a water pressure of 130 mmAq, and the appearance of water leakage was observed for 7 days (water leak test). There wasn't. Similarly, the air was 160 wr
When the air was injected to a pressure of mAq and air leakage was measured for 24 hours (air leak test), there was no leakage at all. The results are shown in Table 1.

Example 2 Same as in Example 1 except that instead of using a propane gas parka in Example 1, heat shrinkage was performed with K f12
The connection time was measured, and a water leak test and an air leak test I* were performed, and the results are shown in Table 1.

Example 3 Two wooden galvanized steel plates? J Spike Rugdaku (Diameter 250mm
A duct nipple with a thickness of 0.8 sn and an inner diameter of 273 mm is connected by pushing a 250-hole duct nipple into the end of the bulge (height 15 wn), and a 16 m thick glyph rubber adhesive layer is provided on the entire inner surface. , rlJ100m+++ cross-linked polyethylene heat-shrinkable tube was applied to the connection part (gL L, heat-shrinked with a propane gas burner [7] and connected for the first time.Connection time was measured, water leak test and near leak test were performed, and the results were reported. 1
Shown in the table.

Comparative Example 1 Spiral duct made of two wooden galvanized steel sheets (diameter 250t,
Insert a 250-piece duct nipple into the end of the duct (height of the seam part is 15 mm), and screw the nipple and duct at 8 places. Thickness 0, 35 wm, adhesive thickness α1
Question 1) was coated and connected 3 times. The connection time was measured, a water leak test and an air leak test were conducted, and the results of the binding are shown in Table 1.

Comparative example 2 2 wood II! Spiral gourd made of lead copper plate (diameter 250
m, the height of the seam part L 5 mm).
195) 250 with 907 evenly applied to the insertion site
After the nipple for the side duct was pushed in, it was screwed together in the same manner as in Comparative Example 1, and the cloth tape was covered three times to connect it. The connection time was measured, and all water leak tests and air leak tests were conducted and the results are shown in Table 1.

Chapter 1 Table

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a state in which two spiral ducts are connected by the connection method of the present invention. 1... Spiral duct, 11... Hase part, 2.
... Nipple, 3... Heat absorption 1 (sex film, 4...
・Adhesive layer patent applicant Sekisui Chemical Co., Ltd. Representative Toshiyoshi Fujinuma +13

Claims (1)

[Claims] L When connecting a duct with an uneven outer surface, a heat-shrinkable film or Gouyugue with an adhesive layer on the inner surface having a thickness equal to or greater than the height difference between the convex part and the four parts of the duct is applied to the connecting part of the duct. A method for connecting ducts, which is characterized by heating and shrinking the ducts after being exposed.