JPS6214728B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of the Invention The present invention relates to an air conditioner incorporating a centrifugal fan.

(b) Prior art A package type air conditioner has a heat exchanger and a centrifugal fan arranged in a vertical relationship, and the inside of the air conditioner is divided by a partition plate, and the centrifugal fan is installed in a square hole in the center of the partition plate. The discharge part of the casing was inserted and connected.

(c) Problems with the conventional technology In order to suspend the centrifugal fan casing from the partition plate, the partition plate is made of a large strength member with a square hole in the center, and the centrifugal fan casing is suspended in the partition plate. Since a sufficient clearance is required to insert the discharge part of the casing, discharged air tends to leak from this clearance to the suction side of the fan casing.
Moreover, it has the disadvantage that wind noise is likely to be generated at the joint between the square hole and the discharge portion.

(d) Purpose of the Invention The present invention provides a thin and lightweight air conditioner in which the suction side and the discharge side of a centrifugal fan casing are separated by an extension of the scroll portion of the fan casing to eliminate air leakage and wind noise. It is something to do.

(E) Summary of the Invention The present invention extends the scroll portion of a centrifugal fan casing, and connects the edges of the extended portion to at least two adjacent inner walls of the outer box to connect the suction side and the discharge side of the fan casing. The structure is divided into sections.

(f) Embodiments of the invention Examples of the invention will be described based on the drawings.
In Fig. 1, reference numeral 1 denotes an exterior plate in which left and right side plates 2a, 2b and a back plate 2c are integrally formed by bending a sheet metal material into a substantially U-shaped cross section as shown in Figs. 2 and 3. , 3 and 4 are a top plate and a bottom plate that close the upper and lower openings of this exterior plate, and 5 is a front plate that closes the front opening of the exterior plate 1. From these plate members, an exterior box 6 of the package type air conditioner is constructed. It is formed.

Reference numeral 7 denotes a centrifugal fan casing in which a scroll portion 8 and a suction surface portion 9 are formed from separate members, and the scroll portion 8 extends both left and right to form extension portions 10a and 1.
The left and right bent edges 11a and 11b of 0b are connected to the outer box 6.
It is joined to the inner walls of the left and right side plates 2a, 2b, and the rear end edges 12a, 12b of the extension parts 10a, 10b.
The peripheral edge 13 of the scroll portion 8 is joined to the inner wall of the back plate 2c. That is, the scroll portion 8 and the extension portions 10a, 10b are made of a strip-shaped sheet metal material.
A suction surface part 9 made of sheet metal and having a suction port 15 and a ventilation guide piece 14, which is bent as shown in the figure.
A centrifugal fan casing 7 is formed by fixing the fan casing 7 to the scroll part 8 by spot welding the flange pieces 16, thereby opening the back part 17 facing the suction face part 9. When the piece 18 is pressed against the inner wall of the back plate 2c and fixed with the screws 19 from the outside, the scroll part 8 and the extension parts 10a, 10b are brought into contact with the inner walls of the back plate 2c and the left and right side plates 2a, 2b on three sides as described above. It is designed to be joined with

Reference numeral 20 denotes a nozzle plate to which an electric motor 22 to which a single-suction Shirotsukou fan 21 is connected is attached via a support leg 23.The fan 21 and electric motor 22 are inserted into the suction port 15 of the centrifugal fan casing 7 and fixed with screws 24. The blower 25 is made into a unit in advance.

26 is a heat exchanger with a sheet metal drain pan 27 fixed in advance to its lower end; 28 is an electrical equipment box; 29 is an operation control unit; 30 is a blow-off grill with a wind direction changing blade 31; This is an air filter inserted behind the grill 34.

Therefore, the assembly of the packaged air conditioner involves expanding the front opening of the exterior plate 1 to the left and right, storing the unitized centrifugal blower 25 in advance, and fixing it with the screws 19. Exchanger 26
At the same time, fix the upper end of the drain pan 27 with the screw 35.
is applied to the air guide piece 14, and both left and right ends thereof are fixed to the mounting flanges 36a, 36b of the front plate 5 with screws 37, 37. After that, the electrical equipment box 28 is stored, the top plate 3 and the bottom plate 4 are attached, and the front plate 5 is attached, and the process is completed.

In the thus completed package air conditioner, the suction side and the discharge side of the fan casing 7 are separated by the scroll part 8, the extension parts 10a and 10b, and the drain pan 27, and the centrifugal blower 2
The depth dimension b of the outer box 6 is the thickness dimension a of 5, and the width dimension d of the outer box 6 is the width dimension c of the centrifugal blower 25.
The heat exchanger 26 and the fan casing 7 provide a thin and slim shape in which the heat exchanger 26 and the fan casing 7 are substantially determined, and the exterior plate 1 is reinforced with braces, resulting in an extremely strong structure.

Note that, unlike the above embodiment, the scroll portion 8 is
The right side plate 2b may also be used by removing the part e shown in the figure up to the right bent edge 11b, or the heat exchanger 26 and the centrifugal blower 25 may be arranged upside down and the outer box 6 If the depth dimension is reduced to the thickness dimension of the fan casing 7, the suction side and the discharge side of the fan casing 7 can be partitioned only by the scroll portion 8 and the extension portions 10a, 10b. In any case, the edges 11a, 1 of the extension part 10a
2a is at least the adjacent left side plate 2 of the outer box 6.
It is sufficient to have an air seal structure in which it is joined to the inner walls of two surfaces of a and the back plate 2c.

Furthermore, if the scroll portion 8 and the extension portions 10a and 10b could be made of separate sheet metal materials and spot welded to form a continuous integrally connected shape with no gaps or undulations, the manufacturing cost would be higher, but this would be functionally acceptable. .

(G) Effects of the Invention According to the present invention, the suction side and the discharge side of the fan casing can be reliably connected by a simple structure in which the scroll portion is extended and its edges are joined to at least two adjacent inner walls of the outer box. It can be partitioned.

Furthermore, by forming the scroll portion and the extension portion from a single sheet metal strip, manufacturing is facilitated, and air leakage and wind noise can be reliably eliminated.

Furthermore, by opening the back side of the centrifugal fan casing that faces the suction surface and closing it with the back plate of the outer box, the number of parts for the fan casing can be reduced, and it can be combined with the single sheet metal shape of the scroll part and extension part. It can be manufactured with a total of two parts, including the suction surface part, which is a separate member.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a longitudinal sectional view of an air conditioner, FIG. 2 is a perspective view of a centrifugal fan casing, FIG. 3 is a perspective view of a centrifugal blower, and FIG. 4 is a perspective view of a centrifugal fan casing. is a sectional view taken along the line -' in FIG. 6...Exterior box, 7...Centrifugal fan casing, 8...Scroll part, 9...Suction surface part, 10
a, 10b...extension part, 11a, 11b, 12
a, 12b... end edge, 17... back part.

Claims (1)

[Scope of Claims] 1. A scroll portion of a centrifugal fan casing is extended, and edges of this extension portion are joined to at least two adjacent inner walls of an outer box to partition a suction side and a discharge side of the fan casing. An air conditioner. 2. The air conditioner according to claim 1, wherein the scroll portion and the extension portion are formed from a single sheet metal strip. 3. The air conditioner according to claim 1 or 2, wherein the back surface of the centrifugal fan casing facing the suction surface is open.