JPH0327225Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a duct connection structure with good watertightness and airtightness.

<Prior Art and Problems> Conventionally, in the connecting portion of a duct, a string-like elastic body made of rubber and/or synthetic resin is compressed and inserted between the flange surfaces, and
It is sealed.

In such a connection structure, since the inserted string-like elastic body generally has a rectangular cross section, as shown in FIG. When the elastic body 3' is attached in a folded state, wrinkles W are generated on the respective adherend contact surfaces (upper and lower surfaces in the figure) due to the difference in the radius of curvature between the inner and outer sides of the bent portion of the elastic body 3'. Such wrinkles W cause dew condensation of water vapor flowing inside the duct to flow out of the duct, or cause blown air to leak out of the duct, thereby reducing ventilation efficiency. In order to eliminate these wrinkles W, it is necessary to increase the compression of the interposed string-like elastic body as much as possible to absorb the wrinkles into the elastic body, but in order to achieve such a compressed state, the duct becomes structurally large. Also, excessive compression may cause the elastic string to lose its ability to recover at an early stage, which is undesirable.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems, and its gist is that the flange surface includes at least one substantially right-angled corner. This is a duct connection structure in which a string-like elastic body formed into a substantially triangular cross section is compressed and inserted between the ducts along the flange surface.

<Example> The present invention will be explained below with reference to the drawings.

In FIGS. 1A and 1B, 1A is a duct unit that houses the radiator 10, 1B is a duct unit that is connected to the duct unit 1A, and the connecting portion of each duct unit 1A and 1B has a right-angled corner part. Flanges 2A and 2B having flange surfaces 20A and 20B including 21, . . . are formed. 3 is a string-like elastic body formed into a triangular cross section, and the flange surfaces 20A, 2
It is compressed and inserted between the surfaces along 0B. Reference numeral 4 denotes a pressure-sensitive adhesive layer provided on the flat bottom portion of the elastic body 3, and is provided, for example, by pasting a double-sided adhesive tape.

The string-like elastic body 3 is preferably a closed-cell or open-cell foam made of a material that has an appropriate resilience against compression, such as rubber and/or synthetic resin, and is extruded to have a triangular cross section, or A piece having a square cross section can be shaped by cutting it into a triangular cross section. In order to compress and insert this string-like elastic body 3 between the flange surfaces 20A and 20B as shown in the figure, the elastic body 3 is provided on the bottom surface of one of the flange surfaces 20A in advance using an adhesive layer 4.
(of course, adhesive may be applied separately on the surface 20A), and then the other flange surface 20B is brought into contact with the vicinity of the top of the elastic body 3 pasted in this way, and gently pressed. Just compress it. Since the elastic body 3 is formed to have a triangular cross-section, as shown in FIG. It does not reach the bottom and top portions which are the contact surfaces of the attached body (flange surface). Therefore, the corner portion 21 of the flange surface 20,
Even if the flange surfaces 20A and 20B are installed along the elastic body 3, the flange surfaces 20A and 20B are sufficiently sealed without excessively increasing the compression of the flange surface 20B against the elastic body 3.

Although not shown, the flanges 2A and 2B can also be connected using a fastening member such as a bolt.

<Effects of the invention> As described above, in the connection structure of the invention, the string-like elastic body inserted between the flange surfaces is molded to have a substantially triangular cross section, so the compression of the elastic body does not have to be increased. It has the feature that no gap is formed between the flange surfaces. Therefore, it is possible to provide a duct connection structure that has good watertightness and airtightness over a long period of time without making the structure large-scale.

[Brief explanation of drawings]

FIG. 1A is a side view showing an example of the present invention, FIG. 1B is a perspective view of the cross section taken along line a-a in FIG. FIG. 3 is a partial perspective view showing an example of a bent state of the body. FIG. 3 is a partial perspective view showing a bent state of a string-like elastic body used in a conventional duct connection part. 1A, 1B...Duct unit, 2A, 2B...
...Flange, 20A, 20B...Flange surface, 3
...String-like elastic body, 4...Pressure-sensitive adhesive layer.

Claims (1)

[Scope of utility model registration request] A duct connection in which a string-like elastic body formed into a substantially triangular cross-section is compressed and inserted between flange surfaces including at least one substantially right-angled corner portion along the flange surfaces. structure.