JPS6214730B2 - - Google Patents

Description

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

(b) Conventional technology Conventionally, in floor-standing package air conditioners with bottom suction and top blowing, after installing and fixing columns with an L-shaped cross section at the four corners of the bottom box, separate left and right parts were attached to these columns. A side panel, a top panel, and a front panel are each screwed together to form a casing, and a heat exchanger is disposed below and a centrifugal fan is disposed above, and a partition plate that partitions the inside of the casing is attached at an angle to the pillar. The partition plate was fixed via a frame, and the discharge part of the centrifugal fan casing was inserted into the square hole in the center of the partition plate.

For this reason, the partition plate must be made of a material with sufficient strength to hang the fan motor and the completed centrifugal fan casing consisting of the suction surface, the opposing surface, and the scroll, and must also be made of a material with sufficient strength to hang the fan motor. Adoption of a frame structure consisting of a plurality of angle frames that span the pillars requires a large number of parts, making assembly complicated and making manufacturing costs relatively high.

In addition, since a clearance is required to insert the discharge part of the centrifugal fan casing into the square hole of the partition plate, discharged air tends to leak from this clearance to the suction side of the fan casing, and the connection between the square hole and the discharge part This had the disadvantage that wind noise was likely to be generated at the joints.

(c) Purpose The present invention aims to reduce the weight of a centrifugal fan casing, eliminate air leakage and wind noise, and provide an inexpensive, thin and lightweight air conditioner that does not require frame parts such as supports. It is.

(D) Structure The present invention is a centrifugal type housing in which the casing is formed of a strong exterior box with one side open and having a substantially U-shaped cross section, and a panel attached to this open side, and the surface facing the suction surface is open. The open peripheral edge of the scroll portion of the fan casing is fixed to the inner wall of the outer box, and the inner wall of the outer box is also used as part of the centrifugal fan casing, thereby suppressing air leakage and wind noise. By reducing the weight of the casing and the number of parts, and by reinforcing the outer box with this fan casing, it is possible to complete a thin and lightweight air conditioner.

(E) Embodiments An embodiment of the present invention will be described based on the drawings.
In FIG. 1, 1 is provided with a top plate 2 and a bottom plate 3 on the upper and lower sides, and left and right side plates 4a, which are made by bending a single sheet metal material into a substantially U-shaped cross section as shown in FIGS. 2 and 3. 4b and a back plate 4c are integrally formed, and 5 is a front panel that closes the open surface of the outer box 1. A housing 6 of the package type air conditioner is formed from these plate members.

Reference numeral 7 denotes a centrifugal fan casing in which a scroll portion 8 and a suction surface portion 9 are formed as separate members, and the scroll portion 8 extends in both left and right directions.
The left and right bent edges 11a, 11b of the outer box 1 are joined to the inner walls of the left and right side plates 4a, 4b of the outer box 1, and the rear edges 12a, 12 of the extensions 10a, 10b
b and the peripheral open edge 13 of the scroll portion 8 on the back plate 4.
It is joined to the inner inner wall 14 of c. That is, the scroll portion 8 and the extension portions 10a, 10b are formed by bending a sheet metal sheet in the form of a belt as shown in FIG. 9 is fixed to the scroll part 8 by spot welding the flange piece 17, thereby forming a centrifugal fan casing 7 in which the surface part 18 facing the suction face part 9 is open. When the plurality of welded mounting pieces 19 are pressed against the inner inner wall 14 of the back plate 4c and fixed with screws 20 from the outside, the circumferential open edge 13 of the scroll portion 8 and the extension portions 10a, 10 are attached as described above.
b is joined to the three inner walls of the back plate 4c and both left and right side plates 4a and 4b in a butt state.

Reference numeral 21 denotes a nozzle plate to which an electric motor 23 to which a single-suction Shirotsuko fan 22 is connected is attached via a support leg 24.The centrifugal fan 22 and electric motor 23 are inserted into the suction port 16 of the centrifugal fan casing 7 and secured with screws 25. The blower 26 is made into a unit in advance.

27 is a heat exchanger with a sheet metal drain pan 28 fixed in advance to the lower end, 29 is an electrical equipment box, 30 is an operation control operation unit, 31 is a blow-off grill with a wind direction changing blade 32, and 33 is a suction unit with a service plate 34 removed from below. This is an air filter inserted behind the grill 35.

Therefore, the assembly of the packaged air conditioner involves expanding the front opening of the outer box 1 to the left and right, housing the unitized centrifugal blower 26 in advance, and fixing it with the screws 20. Exchanger 27
At the same time, fix the upper end of the drain pan 28 with the screw 36.
is applied to the air guide plate 15, and its left and right ends are fixed to the mounting flanges 37a, 37b of the front panel 5 with screws 38, 38. After that, the electrical equipment box 29 is stored, the top plate 2 and the bottom plate 3 are attached, and the front panel 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 28, and the centrifugal blower 2
The depth dimension b of the outer box 1 is the thickness dimension a of 6, and the width dimension d of the outer box 1 is the width dimension c of the centrifugal blower 26.
It is possible to obtain a thin and slim shape in which the heat exchanger 27 and the fan casing 7 are substantially determined, and an extremely strong structure in which the outer box 1 is reinforced with bracing by the heat exchanger 27 and the fan casing 7.

(f) Effects The air conditioner of the present invention uses a strong exterior box with a generally U-shaped cross section that is open on one side as the main component of the exterior casing, and is a centrifugal fan in which the surface facing the suction surface is open. Since the open peripheral edge of the scroll part of the casing is bonded and fixed to the inner wall of the outer box, the outer box can be reinforced with a fan casing to create a strong structure, which eliminates the need for a frame structure such as columns and reduces the number of parts. It can be manufactured easily and inexpensively. Moreover, by using the inner wall of the outer box as part of the centrifugal fan casing, the air discharged from the fan casing is smoothly sent out along the inner wall of the outer box, preventing air leakage and wind noise. A thin and lightweight air conditioner that can reduce the weight of the fan casing and the number of parts, and also suppresses the vibration transmission of the fan casing to the outer box by line contact joining of the open peripheral edge of the scroll part. can be completed.

In addition, by disposing a centrifugal fan casing that also serves as an outer box on the air suction side of the heat exchanger, no dew condensation occurs even if the outer wall of the outer box is not insulated, and manufacturing can be further facilitated.

[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. 1...Outer box, 5...Panel, 6...Casing, 7
... Centrifugal fan casing, 8 ... Scroll part, 9 ... Suction surface part, 13 ... Circumferential open edge, 14
...Inner inner wall, 18...Open surface section.

Claims (1)

[Claims] 1 A housing is formed by an outer box having a substantially U-shaped cross section with one side open and a panel attached to this open side,
This air conditioner is characterized in that the centrifugal fan casing has an open surface facing the suction surface, and the open peripheral edge of the scroll portion is bonded and fixed to the inner wall of the outer box.