JPH0686953B2 - Duct connection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for piping spiral ducts used in blowers, heat source devices, air conditioners and the like.

[0002]

2. Description of the Related Art Conventionally, when piping a spiral duct of this type, the spiral duct is fitted to a connecting pipe body for connection, branching, etc., and the fitting portion is screwed by an iron plate screw, There is known a device in which a synthetic resin tape is wound from above to fix a fitting portion, and is connected so as to maintain airtightness.

[0003]

However, in the prior art, the fitting portion of the spiral duct and the connecting pipe body is screwed by the iron plate screw as described above, and therefore, before the mounting work, Screw holes are drilled, and screws are screwed into the screw holes to connect them, but this screw must be attached at multiple points along the entire circumference of the fitting part.
Besides, it is an extremely heavy labor as it is an assembly work on the ceiling where various wiring and piping are stretched around intricately, and the screw rises and falls off due to the vibration of the gas flowing in the spiral duct during use. There is also a possibility that it is also airtight, and in order to prevent this, it has conventionally been necessary to wind a synthetic resin tape over this screw, so the installation work becomes more complicated and work efficiency is further improved. It was bad. Therefore, the present invention has been made in consideration of the above-mentioned problems of the conventional technology,
The purpose of the present invention is to obtain a duct connecting device which is extremely easy to connect the spiral ducts, which enables quick piping, and which is firmly attached and has excellent airtightness.

[0004]

As a means for accomplishing this, the present invention has a structure in which a locking piece is projected at a peripheral edge of a pipe end portion of a spiral duct, and a connecting pipe body fitted to the locking piece is annularly formed. A contact portion is provided at the center to form fitting straight pipe portions on both sides thereof, spiral ducts are fitted to both fitting straight pipe portions, and their pipe ends are brought into contact with the annular contact portions, respectively. An annular bulge is formed in the center of the outer peripheral surface of the fitting portion, and a tightening band having an elastic packing material attached to the inner peripheral surface is wound around and tightened, and the annular bulge of the tightening band forms an annular shape of the connecting pipe body. While elastically sealing the contact parts, the tube ends of both spiral ducts and the annular contact part of the connecting tube are pressed and sealed with an elastic packing material.
The elastic packing material is elastically contacted and locked so as to bite into the locking piece at the end of the pipe to tightly connect both ducts.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described in detail below. 1 is a spiral duct,
As in the conventional case, a strip-shaped steel plate is spirally wound and connected by a bulging seam 2 and two cuts are made from the edge at the tip of the spiral duct 1, and the cut portion is formed on the outer surface. Cut and bulge at a right angle to project the locking piece 3. A plurality of the lock pieces 3 or 4 are provided at intervals in the circumferential direction. Reference numeral 4 denotes a connecting pipe body, which has an annular abutting portion 5 bulging in an arcuate cross section in the central portion thereof, and fitting straight pipe portions 6 and 6 formed on both sides thereof. Reference numeral 7 denotes a tightening band, which is formed by bending a strip-shaped metal plate into a substantially semicircular shape to form a strip-shaped member 8. The strip-shaped member 8 is provided at both ends of the hinge 14, respectively.
8 are connected to each other to form an openable and closable circular shape, and a tightening band 7 formed by both belt-shaped members 8 has an annular bulging portion 9 having an arcuate cross-section at the center, and the tightening flat portions on both sides thereof. 10 and 10 are provided, and bending pieces 12 having small holes 11 are respectively provided upright at both ends of the fastening portion flat 10.
Further, a thick elastic packing material 13 is attached to the inner surface side of the tightening band 7.

With this structure, in order to connect the spiral ducts 1, the spiral ducts 1 are inserted and fitted into the fitting straight pipe portions 6 on both sides of the connecting pipe body 4, respectively. The tip is connected to the connecting tube body 4 with an annular contact portion 5 at the center.
Abut. Then, after tightening the tightening band 7 in which both the band-shaped members 8 are opened from the hinge 14 portion in advance so as to cover the outer peripheral surface of the fitting portion of the spiral duct 1 and the connecting pipe body 4, Bending piece 1 of the tightening band 7
The bolt 16 is inserted into the small hole 2 of 2, and the nut 16 is screwed in. As a result, the diameter of the tightening band 7 is reduced, so that the elastic packing material 13 attached to the inner surface side of the tightening band 7 is reduced.
Is tightly pressure tightly tightened so as to tighten the tip of the spiral duct 1 and the annular contact portion 5 of the connection pipe body 4, and the gap between the spiral duct 1 and the connection pipe body 4 is tightly closed to maintain airtightness. So that it is securely clamped. At that time, the annular bulging portion 9 at the center of the tightening band 7 is press-contacted and sandwiched on the annular contact portion 5 at the center of the connecting pipe body 4 via the compressed elastic packing material 13, and left and right of the connecting pipe body 4 are secured. The movement of the spiral duct 1 is prevented, and at the same time, the locking piece 3 at the tip of the spiral duct 1 bites into the elastic packing material 13 and further locks on the inner surface of the annular bulging portion 9 of the tightening band 7. It can be firmly connected without being delusionally separated even if an external force is applied.

[0007]

As described above in detail for the embodiments,
This invention inserts and fits a connecting pipe into a spiral duct,
The fitting part can be easily connected only by a simple operation of tightening it with a tightening band, whereby the fitting part can be strongly pressure-bonded with the elastic packing material of the tightening band to enhance airtightness. At the same time, the annular bulging portion of the tightening band fits into the annular abutting portion of the connecting pipe body, and the locking piece of the spiral duct bites into the elastic packing material and locks on the inner surface of the annular bulging portion of the tightening band. , The spiral duct is securely connected and does not move and separate. This allows quick and easy assembly and connection as compared with the complicated installation work such as drilling a screw hole, connecting a duct with a screw, and winding a synthetic resin tape as in the prior art, and also depends on the gas flow during use. It is possible to inexpensively provide a robust duct connecting device that is excellent in airtightness without being distorted even if it receives vibration.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a duct connecting device of the present invention before a duct is partially cut away

FIG. 2 is a side view of the duct connecting device according to the present invention when the duct is partially cut away and connected.

FIG. 3 is a side view of the tightening band of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 spiral duct 2 bulging seam, 3 locking piece 4 connecting tube body 5 annular contact portion 6 fitting straight pipe portion 7 tightening band 9 annular bulging portion 10 tightening flat portion 11 small hole 12 bent piece 13 elastic packing material 14 Hinges 15 Bolts 16 Nuts

Claims (1)

[Claims] 1. A spiral duct is provided with a locking piece projecting at a peripheral edge of a pipe end portion, and a connecting pipe body fitted to this is provided with an annular abutting part projecting in the center thereof, and is directly fitted on both sides thereof. Forming a tube,
Spiral ducts are fitted to both fitting straight pipe parts, and their pipe ends are brought into contact with annular contact parts, respectively, and an annular bulging part is formed in the center from the outer peripheral face of the fitted parts, and the inner peripheral face is formed. The tightening band having the elastic packing material attached thereto is wrapped around and tightened, and the annular bulging portion of the tightening band clamps the annular contact portion of the connecting pipe body to the pipe end portions of both spiral ducts with the elastic packing material. A duct characterized in that the duct is characterized in that the duct is characterized in that the duct is characterized in that the duct is characterized in that the duct is characterized in that the duct is characterized in that the duct and the duct are tightly connected to each other by press-fitting and sealing the annular abutting part of the connecting pipe, and elastically engaging the elastic packing material so as to bite into the engaging piece of the pipe end. Connection device.