JP2548645Y2 - Air conditioning duct - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning duct in which a male duct and a female duct formed by blow molding a synthetic resin are fitted.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a small-diameter portion 10a is formed at the mouth end of a male duct 10 to form a step portion 10b, and the mouth end of a female duct 11 is fitted to contact the step portion 10b.

In the case of blow molding as shown in FIG. 6, a resin parison is inserted with the split mold 12 open, air is injected into the resin parison to expand the parison, and the split mold 12 is closed and cut from the parting line. The swelled part is the mold joining part 12a.
And crushed from both sides to form a slicing duct 10.

[0004]

[Problems to be Solved by the Invention] In the above prior art,
There is a step 10b in the fitting part and the inside diameter is narrowed, so that resistance to air flow is generated. Also, when the duct is formed, the part of the duct 10 which is crushed and cut off from both sides by the split mold joint part. Line section P. L has a problem that it is extremely thin and has low strength and is easily cracked.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an air conditioning duct in which a male duct and a female duct formed by blow molding of synthetic resin are fitted. , at least a split mold, leaving a certain distance from the mouth end of the male duct of the same internal diameter along one side parting line to form a longitudinal rib by crushing, fitted female duct male duct inlet end, the female The end of the duct is brought into contact with the end of a longitudinal rib of the male duct.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 4 will be described in detail. 1 is a male duct having the same inner diameter, as shown in FIG.
Parting lines P. on both sides of the split mold 5 during blow molding.
Longitudinal ribs 2 are integrally formed by crushing along L.
Reference numeral 3 denotes a female duct, the inner diameter of which is the same as that of the male duct 1, the mouth end of which is large, and the large diameter portion 3a is fitted to the mouth end outer peripheral portion 1a of the male duct 1 on which the longitudinal rib 2 is not formed. The mouth end is in contact with the end of the longitudinal rib 2. As with the male duct 1, the female duct 3 also has partition lines P. Vertical ribs 4 are formed by crushing along L.

[0007]

According to the present invention, in an air-conditioning duct in which a male duct and a female duct formed by blow molding of a synthetic resin are fitted, the mouth end of the male duct having the same inner diameter <br> A longitudinal rib is formed by crushing at least one side of the split mold along a parting line while leaving a certain distance, and the male duct is formed.
The female duct is fitted at the mouth end , and the female duct mouth end is in contact with the vertical rib end of the male duct, so the vertical rib eliminates cracking of the duct, and the inner diameter of the fitting part becomes straight. The ventilation resistance can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an upper half of a fitting part according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory perspective view of a fitting portion of FIG. 1;

FIG. 4 is a sectional view of a vertically elongated rib portion at the time of the male duct blow molding of FIG. 1;

FIG. 5 is a front sectional view of a fitting portion of a conventional air conditioning duct.

FIG. 6 is a cross-sectional view of a parting line portion during blow molding of a conventional duct.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male duct 2 Vertical rib 3 Female duct 3a Large diameter part of female duct 4 Vertical rib

Claims (1)

(57) [Scope of request for utility model registration] 1. A At a air conditioning duct which is adapted to fit the male duct and female duct molded by blow molding of synthetic resin, a split mold to leave a certain distance from the mouth end of the male duct of the same internal diameter at least to form a longitudinal rib by crushing along one side parting line, fitted female duct male duct inlet end, that is brought into contact with the female duct outlet end to the elongated rib end of the male duct Characteristic air conditioning duct.