JP3845091B2 - Long flexible duct disconnection prevention connection device - Google Patents

Description

  The present invention relates to a connection structure for connecting a long flexible duct to a branch box in air conditioning piping.

  As shown in FIG. 3, a branch box 10 for air conditioning is generally installed on a ceiling portion of a building or factory using a hanging bracket 19, and a flange-fixed connection port 12 is provided on a side surface of the branch box 10. Air conditioning air is supplied from an air conditioning supply source (not shown). In general, long flexible ducts 14a, 14b, 14c, and 14d are connected to the other side surface of the branch box 10 through one-touch attachment means 16a and 16b, and the other end of the flexible duct is connected to the one-touch attachment means 17c. , 17d, etc., are connected to the system ceiling blowing chambers 18a, 18b, 18c, 18d attached to the back of the ceiling, and air is sent to a predetermined air-conditioning target room. In general, the outer periphery of the flexible duct is covered with a heat insulating material so that a silencing effect can be maintained. The branch box is also filled with glass wool for heat insulation and silencing.

  Various methods are employed for the above-described one-touch type attachment means 16a, 16b, 17c, and 17d. Examples thereof are shown in FIGS. 4A, 4B, and 4C. As shown in the state before connection in FIG. 4A, an annular connection fitting 50 protrudes and is attached to the end surface 11 of the branch box 10, and a glass wool 52 for heat insulation and sound silencing is incorporated therein, and the inner edge of the connection fitting 50 A packing 54 for sealing is attached to the. On the other hand, on the flexible duct 14 side, a cylindrical one-touch neck portion 56 is inserted at the tip thereof, and an adhesive tape 58 is wound around it and fastened by a steel plate belt 60. In order to increase the frictional force on the outer periphery of the one-touch neck portion 56, a flocking 57 is processed.

  FIG. 4B shows a state in which the flexible duct 14 is inserted into the branch box 10. As shown in an enlarged view in FIG. 4C, the tip of the one-touch neck portion 56 that has been flocked is inserted so that the packing 54 is pushed in. The flexible duct 14 is held in that position by the frictional force between the packing 54 and the flocks 57. A packing presser 53 is inserted between the glass wool 52 and the packing 54, and a recess (rib) 55 for preventing the packing 54 from coming off is provided.

However, with this connection method using frictional force, due to poor insertion at the time of construction, air leakage occurs due to incomplete connection, or the insertion part is detached due to external force such as maintenance after construction or earthquake There was a possibility.
Japanese Patent Application Laid-Open No. 2003-65589 “Air-Condition Duct Connection Device” and Japanese Patent Application Laid-Open No. 2003-148793 “Air-Condition Duct Connection Device” are provided with a plurality of annular protrusions on each of the branch box side and the connection piping side, A method is described in which a duct is inserted by applying force to keep both elastic. However, it is not easy to finish such an annular protrusion with high accuracy, so it is difficult to accurately match the unevenness during construction, and dimensional errors of the annular protrusion on the mating surface tend to cause air leakage and duct detachment. Disadvantages are known.

  An object of the present invention is to provide a one-touch type connection structure that can reliably prevent air leakage from a connecting portion of a flexible duct and removal of the duct.

The above-described problem of the present invention is a disconnection prevention connecting device for a long flexible duct connected to a branch box of an air conditioning duct, and a flocking process is performed on an outer periphery of a cylindrical insertion portion of the long flexible duct. In addition, a plurality of removal prevention metal fittings are attached, the removal prevention metal fittings are formed by claw-shaped protrusions protruding in the radial direction, and a circular opening is provided in the end plate of the long flexible duct receiving portion of the branch box , multiple acceptable the claw-shaped projections to the opening incision is formed, resilient gasket having a slightly smaller opening than the opening on the inside of the opening is mounted, further heat insulating material on the inside of the end plate are lined, the claw-shaped projections when inserting the cylindrical insertion portion of the elongated flexible duct to the branch box is inserted into the notch above, By being rotated within Toki box, it is held in that position, achieved by in which strain relief connection device so as to prevent air leakage from the connection portion by flocking and the packing.

Based on this configuration, according to the present invention,
(1) When the flexible duct is inserted into the branch box, it is inserted until the removal prevention bracket stops in the branch box, so there is no risk of insufficient insertion during construction. (2) No skill is required for the work. (3) The removal prevention mechanism that uses the catches of the claws of the metal fittings to prevent unplugging. (4) Troubles that can come off unexpectedly even after maintenance or during an earthquake. Can be prevented.

  Hereinafter, the present invention will be described in more detail with reference to embodiments of the accompanying drawings.

  1 and 2 show a preferred embodiment of a long flexible duct disconnection prevention connecting device according to the present invention. FIG. 1A shows a state before inserting the flexible duct, FIG. 1B shows a state after insertion, and FIG. FIG. 1D is an enlarged view of the D portion of FIG. 1C. 1A, the one-touch packing 24 is attached to the back side of the end plate 11a on the end face 11 of the branch box 10, and a glass wool 52 for heat insulation / silence is incorporated therein. .

  On the other hand, on the long flexible duct 14 side, a cylindrical one-touch neck portion 26 is inserted (press-fitted) at the tip thereof, and a flocking 27 is processed on the outer periphery to increase the frictional force. As shown in FIG. 1C, two drop prevention fittings 28 are attached to the outer periphery of the insertion portion (one-touch neck portion) 26 of the flexible duct 14, and each drop prevention fitting 28 is formed on a claw-shaped protrusion 28a protruding in the radial direction. ing. Further, four recesses (cuts) 30 that can receive the claw-shaped projections 28a of the drop-off prevention fitting 28 are provided in the circumferential direction in the flexible duct receiving portion (end plate 11a) of the branch box 10. These claw-shaped projections 28a and recesses 30 are provided at positions (preferably equidistant) aligned in the circumferential direction, and can be inserted at positions where both are matched, as shown in FIGS. It is possible.

2A and 2B show a state after the insertion portion 26 of the long flexible duct 14 is inserted into the branch box 10 as shown in FIG. 1B and then the insertion portion 26 is rotated and fixed. As described above, since the glass wool 52 is lined (filled) in the branch box 10, the claw-shaped projection 28 a can be rotated in the recess 30. As shown in FIG. 2B, the claw-shaped protrusion 28a inserted into the recess 30 is moved to a position along the circumferential direction after rotation, and stops at an appropriate position by the resistance of glass wool.

  Specifically, as shown in an enlarged view in FIG. 2A, the tip of the one-touch neck portion 26 that has been flocked is inserted so that the packing 24 is pushed in, and the flexible duct 14 is also formed by the frictional force between the packing 24 and the flocking 27. Held in that position. A packing presser 23 is inserted between the glass wool 52 and the packing 24, and a recess 25 (rib) for preventing the packing 24 from coming off is provided. Thus, when the long flexible duct is inserted into the branch box, the claw-shaped projection 28a is inserted into the recess 30 and is rotated in the branch box 10 to be held in that position. Yes. When removing the flexible duct from the branch box, the claw-shaped projections 28a can be rotated in the opposite direction and pulled out at a position matching the recess 30 to separate them. Note that a stopper can be provided in the circumferential direction as necessary.

Examples of the material specifications of various members in the present invention are as follows.
(1) End plate of branch box SGCC steel plate Thickness 0.8mm
(2) One-touch packing Silicone rubber packing (3) One-touch neck SGCC steel plate Thickness 0.8mm
(4) Removal prevention bracket SUS304 steel plate, thickness 0.3mm
(5) Flocking Polyacrylonitrile flame resistant fiber

  As described above in detail, according to the disconnection prevention connecting device of the present invention, when the flexible duct is inserted into the branch box, the disconnection prevention fitting is inserted until it stops in the branch box, so that there is a risk of insufficient insertion during construction. No need for skill in the work, so there is no unevenness in construction due to differences in skill level, and the removal prevention mechanism that uses the catches of the claws of the metal fittings can prevent the disconnection reliably. The effect that the trouble which falls out is prevented is acquired, The technical effect has a very remarkable thing.

Sectional drawing showing the state before and behind insertion of the connection apparatus by this invention. Sectional drawing showing the fixed state after insertion of the connection apparatus by this invention. The perspective view of the branch box and flexible duct to which this invention is applied. Sectional drawing showing the state before and behind insertion of the conventional connection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Branching box 11 End surface 11a End plate 14 Flexible duct 16, 17, 26 Insertion part 24 Packing 28 Detachment prevention metal fitting 28a Claw-shaped protrusion 30 Recess

Claims (1)

A disconnection prevention connecting device for a long flexible duct connected to a branch box of an air conditioning duct,
Along the outer periphery of the cylindrical insertion part of the long flexible duct , a flocking process is performed, and a plurality of removal prevention metal fittings are attached,
The escape prevention metal fitting is formed by a claw-shaped projection protruding in the radial direction,
A circular opening is provided in the end plate of the long flexible duct receiving portion of the branch box, and a plurality of cuts capable of receiving the claw-shaped projections are formed in the opening ,
A resilient packing having an opening slightly smaller than the opening is attached to the inside of the opening,
Furthermore, a heat insulating material is lined inside the end plate,
Is inserted a tubular insertion portion of the elongated flexible duct in cut the said claw-shaped projections upon insertion into the branch box, by being rotated at a branch box inside, is held in that position, the A long flexible duct disconnection preventing connecting device characterized in that air leakage from the connecting portion is prevented by packing and flocking .

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