JPH0414252Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a blower duct structure for an air conditioner for an automobile.

(Prior art) In the conventional blower duct structure of an automobile air conditioner, air is blown from the air conditioner to the air outlet in the center, left and right sides, and lower part of the instrument panel, as well as to the air outlet of the defroster. In the past, a number of ducts were installed independently to blow air from the outlet to each outlet.
In this case, there are problems such as an increase in the number of ducts, a complicated duct route, and a complicated structure of the air outlet opening of the air conditioner.

Therefore, for example, in Japanese Utility Model Application Publication No. 57-67814,
A blower duct connected to the outlet of an air conditioner that is integrated on the upstream side and branched on the downstream side, or a blower duct in which the upstream ends of two left and right ducts are inserted in parallel into the outlet of the air conditioner. is listed.

However, these above-mentioned air ducts are generally manufactured by blow molding synthetic resin materials, but blow molded products are usually thin, have poor rigidity, have poor molding dimensional accuracy, and have a mounting flange that connects to other components. Since it is not possible to integrally mold a frame-like structural part such as
It is difficult to mold the upstream end of the ventilation duct into a structure that allows it to be tightly connected to the outlet of the air conditioner without any gaps, and it is necessary to take measures such as applying some kind of seal to prevent air leakage at this connection. Therefore, there are restrictions such as not being able to connect the air outlet with a flange.

(Purpose of the invention) The present invention was made in view of the above-mentioned drawbacks, and it is possible to form a mounting flange part with high rigidity and dimensional accuracy at the connection part with the outlet of the air conditioner, and it is mostly cost effective. An object of the present invention is to provide a blowing duct structure for an automobile air conditioner that can be made into an advantageous blow molded product.

(Structure of the invention) The air blowing duct structure of the automotive air conditioner according to the invention has a first inlet opening at the front end of the central part, and extends from the central part to the left and right to blow air to the left and right outlets of the instrument panel. A first duct made of synthetic resin having a branch pipe and a right branch pipe, fixed to the center of the first duct, having a second inlet opening at the front end, and connected to the air outlet at the center of the instrument panel at the rear end. a second duct made of synthetic resin that has an outlet opening and forms an air passage in the front-rear direction; the second duct has an opening for insertion into the first inlet opening of the first duct; The first inlet opening of the first duct inserted into the section partitions the second inlet opening and faces the outlet opening of the air conditioner, and the front end of the second duct has a first inlet opening and a second inlet. A mounting flange is formed to surround the outer periphery of the opening and to be connected to the edge of the outlet of the air conditioner.

(Effect of the invention) As described above, the air duct structure of the automobile air conditioner according to the invention includes the first duct made of synthetic resin and the second duct made of synthetic resin, and the first duct is located in the central part. Since it has a relatively simple structure with a first inlet opening at the front end and a left branch pipe and a right branch pipe extending to the left and right of the center, it can be formed by blow molding, and the second duct can be formed by blow molding. Since it has a downwardly open structure that is fixed to the front and back and forms an air passage in the front and back direction, it can be molded with high precision by injection molding.

Therefore, the front end of the second duct is provided with a mounting flange portion that surrounds the outer periphery of the first inlet opening and the second inlet opening and is connected to the edge of the outlet opening of the air conditioner with high precision and high rigidity. It can be formed and easily connected to the edge of the blow-off opening without any gaps.

In other words, the first duct, which occupies most of the duct structure, can be manufactured inexpensively by blow molding, while the second duct having the mounting flange can be manufactured with high precision by injection molding.

(Example) Hereinafter, an example of a blower duct structure of an automotive air conditioner according to the present invention will be described based on the drawings.

As shown in FIG. 1, the above-mentioned ventilation duct structure consists of a first duct 1 made of synthetic resin and a second duct made of synthetic resin, and includes a first inlet opening 3 of the first duct 1 and an inlet of the second duct 2. The opening 4 is the mounting flange part 5
The air flowing into the first duct 1 from the first inlet opening 3 is distributed to the left branch pipe 1a and the right branch pipe 1b of the first duct 1, The air is supplied to the left and right air outlets 10a and 10b of the instrument panel 9 through the connecting ducts 8a and 8b, respectively, and the air that flows into the second duct from the second inlet opening 4 of the second duct 2 is supplied to the second duct 2. Air is supplied from the outlet opening 11 at the rear end to the air outlet 10c at the center of the instrument panel 9.

Next, the structures of the first duct 1 and the second duct 2 will be explained in detail with reference to FIGS. 2 to 4.

The first duct 1 is a hollow body integrally molded by blow molding a synthetic resin material, and has a first inlet opening 3 at the front end of its central portion, and extends integrally from the central portion to the left and right, respectively. Left branch pipe 1
a and a right branch pipe 1b are provided.

Reference numeral 12a denotes a connecting cylinder portion hanging from the periphery of the opening 12 provided in the bottom wall 3a of the first inlet opening 3;
A duct (not shown) for blowing air downward from the instrument panel 9 is connected to this connecting cylinder portion 12a.

The second duct 2 is integrally molded by injection molding a synthetic resin material, and has a pair of left and right side walls 13.
It is composed of an upper wall section 14 that alternates between the upper ends of these side wall sections 13, a mounting flange section 5 at the front end, a connecting section 15 having a PP hinge at the center of the lower part of the mounting flange section 5, etc. 2nd duct 2
is formed to have approximately the same length in the front-back direction as the central part of the first duct 1, and the upper wall 16 of the central part of the first duct 1
The upper wall 16 is placed and fixed on the duct to form an air passage in the front-rear direction with the upper wall 16 serving as the bottom wall of the duct.

At the front end of the second duct 2, there is a first duct 1.
A first inlet opening insertion opening for inserting the first inlet opening 3 and a second inlet opening 4 adjacent to the upper side thereof.
is provided, and an instrument panel 9 is provided at the rear end.
An outlet opening 11 connected to the central outlet 10c of
is formed.

The mounting flange 5 formed at the front end of the second duct 2 has a first inlet opening 3 and a second inlet opening 4.
The screw 17 connects the center of the bottom wall 3a of the first inlet opening 3 and the connecting portion 15 located immediately below the center of the bottom wall 3a of the first inlet opening 3.
By fixing the bottom wall 3a of the first inlet opening 3 with
There is no gap between the lower surface of the mounting flange 5 and the mounting flange 5.

Furthermore, the mounting flange portion 5 is attached to an air conditioner 6.
The mounting flange portion 5 and the flange 7a are connected by means such as screws.

A mounting flange 13a is provided along the lower edge of the side wall portion 13 of the second duct 2, and the mounting flange 13a is fixed onto the upper wall 16 of the central portion of the first duct 1 by means such as screws or adhesive. The second duct 2 is fixed to the first duct 1 by this.

Incidentally, reference numeral 18 is a mounting portion for attaching the duct structure to the instrument panel 9, and reference numeral 19 is a mounting portion for attaching the duct structure to the instrument panel 9.
Reference numeral 20 indicates a current plate, and reference numeral 20 indicates a mounting flange that connects the second duct 2 to the central air outlet 10c of the instrument panel 9.

In the above configuration, most of the air supplied to the first inlet opening 3 of the first duct 1 is supplied to the left branch pipe 1a.
and the right branch pipe 1b, and are fed to the left and right air outlets 10a, 10b of the instrument panel 9, respectively, and some air is fed from the opening 12 to the air outlet below the instrument panel 9. . Further, the air fed to the second inlet opening 4 of the second duct 2 passes through the second duct 2 and is fed from the outlet opening 11 to the air outlet 10c in the center of the instrument panel 9.

In the duct structure of the above embodiment, since the first duct 1 is a hollow body with a relatively simple shape, it can be mass-produced economically by blow molding, and the second duct 2 having the mounting flange portion 5 is located downward. Since it has an open, non-hollow structure, it can be molded with high precision by injection molding.

Therefore, a duct structure can be obtained that combines the advantages of blow molded products and injection molded products.

In the above embodiment, the second duct 2 is arranged above the center of the first duct 1, but the second duct 2 is arranged below the center of the first duct 1 and the first inlet opening is It goes without saying that the second inlet opening 4 may be formed on the lower side of the opening 3.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an exploded perspective view of an automobile air conditioner and its ventilation duct, FIGS. 2 and 3 are a perspective view and an exploded perspective view of the duct structure, respectively, and FIG. FIG. 4 is an end view taken along the line shown in FIG. 2. 1...First duct, 1a...Left branch pipe, 1b...
...Right branch pipe, 2...Second duct, 3...First inlet opening, 4...Second inlet opening, 5...Mounting flange, 6...Air conditioner, 7...Blowout opening, 9...
...Instrument panel, 10a, 10b, 1
0c...Air outlet, 11...Outlet opening, 16...Top wall.

Claims (1)

[Scope of utility model registration request] a first duct made of synthetic resin having a first inlet opening at the front end of the central part, a left branch pipe and a right branch pipe extending left and right from the central part and blowing air to the left and right air outlets of the instrument panel; It is fixed to the center of the duct, has a second inlet opening at the front end, has an outlet opening connected to the air outlet at the center of the instrument panel at the rear end, and is made of synthetic resin and forms an air passage in the front-rear direction. a second duct, the second duct is formed with an opening for insertion of the first inlet opening of the first duct, and the first inlet opening of the first duct inserted into the opening is inserted into the second inlet opening. The front end of the second duct is connected to the edge of the air outlet of the air conditioner by surrounding the outer peripheries of the first and second inlet openings. A blower duct structure for an automobile air conditioner, characterized in that a mounting flange portion is formed.