JPH076587B2 - Duct reinforcement structure - Google Patents

Description

The present invention relates to a reinforcing structure of a duct, for example, a glass wool duct, and in particular, it always enables stable construction without disturbing the flow of fluid in the duct. The present invention relates to a lightweight reinforcing structure.

(Prior Art) In recent years, glass wool ducts are being widely adopted because they have the advantages of easier construction and lighter weight than conventional iron plate ducts. The wall of the glass wool duct is likely to swell inward when inhaling (returning) and tends to bulge outward when supplying air (supply). Duct reinforcement structures have been proposed.

Conventionally, generally, as shown in FIG.
Reinforcement material 2 in which channel steel is joined in a rectangular shape on the outside when blowing air
It is arranged by attaching the suspension support member 3 to the lower portion and attaching it to the ceiling with the suspension bolts 4. Also, assuming that the reinforcing material 2 is not used, as shown in FIG. 5, the wire 4 penetrated through each of the top wall 1a and the bottom wall 1b of the duct.
To each of the plates 5a, 5b, 6a, 6b which are brought into contact with the inner and outer surfaces of their respective wall portions 1a, 1b, by fixing or fixing by caulking or the like to form a duct reinforcing structure, and In another example shown in FIG. 6, the metal pipes 7 provided on the both side flanges 7a are connected to the top wall 1a and the bottom wall 1b of the duct 1 by their respective flanges 7a.
Two screws 9 which are respectively brought into contact with the inner surfaces of the above, and whose top wall 1a and bottom wall 1b are penetrated from the outside through washers 8 to form two pieces inside the metal pipe. The chrysanthemum nut 10, in other words, the duct reinforcing structure is formed by screwing the chrysanthemum washer with the female screw member in which the female screw portion is formed.

(Problems to be Solved by the Invention) However, among the conventional techniques, the type using the reinforcing material in which the channel steel is joined in a rectangular shape cannot be reinforced in a rectangular shape at a branch point, as shown in FIG. It has to be reinforced. Therefore, there is a drawback that the weight becomes large, the structure is easily bent and it is difficult to return to the original state, and the construction is also difficult. Further, in the former example in which the wire 4 is used in the type that does not use the rectangular reinforcing member, it is not possible to prevent the duct from bulging inward at the time of intake, and it is possible to always perform a constant construction. There is a problem that it is not possible, and in the latter example using the metal pipe 7,
Although the problem of the former example can be solved, since the relatively large diameter metal pipe 7 is arranged in the duct, the flow resistance of the fluid in the duct increases and the weight increases,
Furthermore, there was another problem that the pulling strength of the chrysanthemum nut 10 was not stable.

The present invention provides a duct reinforcing structure that solves all the problems of the prior art.

(Means for Solving the Problem) In the duct reinforcing structure of the present invention, two female screw members are arranged in contact with the opposing wall surfaces inside the duct, and these female screw members are formed by one male screw member. Interconnected, and further to each of those female threaded members,
From the outside of the duct, two bolts that penetrate the wall of the duct via washers are respectively screwed together.

(Operation) With this duct reinforcement structure, the duct can be reinforced by screwing each of the single male screw member and the two bolts into the female screw member and tightening them. In contrast, the bulging of the duct inward and outward is sufficiently prevented by the action of the male screw member, and the duct is always attached to each part in a desired state.

Moreover, here, since one male screw member and two female screw members having a relatively small diameter are arranged in the duct,
In addition to significantly reducing their obstruction to the flow of fluid in the duct, the overall weight of the reinforcing structure can also be significantly reduced.

In addition, since each female screw member here can be screw-engaged with the male screw member and the bolt over a sufficient length, it is possible to almost surely prevent them from accidentally coming off from the female screw member.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional perspective view showing an embodiment of the present invention,
11 in the figure shows a rectangular duct made of glass wool, and
Reference numeral 12 denotes a reinforcing structure attached to the rectangular duct 11 at a predetermined interval in the length direction thereof.

Here, the reinforcing structure 12 is arranged inside the duct 11 such that two female screw members 13 are respectively brought into contact with each other by the respective flanges 13a of the top wall 11a and the bottom wall 11b facing each other. Together with those female screw members 13
Is screwed into the boss portion 13b of each of the female screw members 13, one male screw member 14 made of metal or synthetic resin,
Preferably, each end portion is interconnected by a male threaded member 14 having a reverse threaded portion, and each of these female threaded members 13 is further connected to the outside of the duct 11 and thus to the outside of the top wall 11a and the bottom wall 11b. From 15 washers
The two bolts 16 penetrating them through the screws are respectively screwed together.

Here, each female screw member 13 that can be made of a metal material, a synthetic resin material, or the like can have a circular flange 13a as shown in an enlarged view in FIG. As long as it does not interfere with other wall portions, other reinforcing structure 12 or the like, it may have a flange having an appropriate contour and area. As for the female screw member 13 which is arranged in the vicinity of the joint position of the duct 11, as shown in FIG. 3, the flange 13a is extended in the front-rear direction,
It is preferable to contact both the front and rear ducts 11.

In addition, the boss portion 13b of each female screw member 13 can also specify the screw-in amount of the male screw member 14 and the bolt 16 in relation to the duct size, the wall thickness thereof, and the like. With the screw holes 13c and 13d of this, according to this, when assembling the reinforcing structure 12, the screwing amounts of the male screw member 14 and the bolt 16 into the boss portion 13b are always made constant, and stability in each portion is ensured. It is possible to complete the construction very easily.

The shape and area of the washer 15 that is also made of a metal material, a synthetic resin material, or the like and contacts the outer surface of the duct 11 can be appropriately set as required, like the flange 13a described above. Of these, as for the washer 15 disposed in the vicinity of the joint position of the duct 11, the same as the female screw member 13 shown in FIG. Is preferred,
According to this, by assembling the reinforcing structure 12, the wall portion of the adjacent duct 11 can be sandwiched between the flange 13a and the washer 15.

Further, such a washer 15 and the bolt 16 penetrating the duct wall portion can be made of metal, synthetic resin, or a composite thereof, and the bolt 16 can be replaced with a flanged bolt like the illustrated example. If so, the clamping force can be advantageously distributed on the washer.

According to the duct reinforcing structure as described above, the duct 11 can be reinforced by screwing the one male screw member 14 and the two bolts 16 into the two female screw members 13, respectively. It is possible to sufficiently prevent the duct 11 from bulging inward and outward with respect to both intake and blown air by the duct 11, and the reinforcing structure 12 can be always installed as intended, as well as inside the duct. The female screw member 13 and the male screw member 14 existing in the above can be made sufficiently small in diameter to significantly reduce the obstruction of fluid flow in the duct due to them, and also significantly reduce the weight of the reinforcing structure 12.

Moreover, each of the male screw member 14 and the bolt 16 is provided with the same hole 13 of the female screw member 13 over a sufficient length.
Since they are screwed into c and 13d, they can be almost completely prevented from accidentally coming off from the female screw member 13.

Although not shown, the duct reinforcing structure of the present invention is
It can be applied to the opposite side walls of the duct, or can be applied to a duct made of iron plate.

(Effects of the Invention) Thus, according to the present invention, it is possible to sufficiently oppose both intake air and blown air, and it is possible to always carry out the work as intended, and also to prevent fluid flow in the duct. Both the resistance and the weight of the reinforcing structure can be significantly reduced, and furthermore, accidental slipping out of the male screw member and the bolt can be almost completely prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an embodiment of the present invention, FIGS. 2 and 3 are enlarged views of the main part of FIG. 1, and FIGS. 4 to 7 are cross-sectional views showing a conventional example. It is a perspective view. 11 …… duct, 11a …… top wall 11b …… bottom wall, 12 …… reinforcing structure 13 …… female screw member, 13a …… flange 13b …… boss part, 13c, 13d …… screw hole 14 …… male screw member , 15 …… washer 16 …… bolt

Claims (1)

[Claims] 1. An internal thread member, two internal thread members contacting opposite wall surfaces, an external thread member interconnecting these internal thread members, and a duct wall portion penetrating from the outside through a washer. A duct reinforcement structure that includes two bolts that are each screwed into an internal thread member.