JPH09158890A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the mechanical unbalance of a cross flow fan provided on the indoor unit of an air conditioner, and also reduce noise. SOLUTION: In a cross flow fan 7 comprised by laminating plural cup-like constitution parts, wherein plural vanes 15 are neary radially provided in one side circumferential direction of a disklike supporting member 14, and joining a disklike supporting end plate 13 to one side; the mechanical unbalance in right and left of the fan 7 can be improved, and also noise can be reduced, by forming the tip part of the vane 15, integrally provided on the supporting member 14, into a first constitution part 17a tilted in a rotation direction from a root, and a second constitution part 17b tilted in a reversely rotating direction; to alternately laminate these constitution parts 17a and 17b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to a structure of a cross flow fan used in an indoor unit of an air conditioner.

[0002]

2. Description of the Related Art An indoor unit of an air conditioner has an indoor air inlet 2 and an outlet 3 as shown in FIG. 1, and an air passage 4 connecting the inlet 2 and the air outlet 3 has air. A filter 5, a heat exchanger 6, and a crossflow fan 7 that blows the air that has been heat-exchanged by the heat exchanger 6 to the air outlet 3 are arranged. The cross flow fan 7 has a shape as shown in FIG. 3A when viewed from the front, and the cross flow fan 7 has a disc-shaped support end plate 21.
And a plurality of component parts 24 integrally provided with a plurality of blades 23 in the circumferential direction on one side of the disk-shaped support member 22, and these components are axially laminated. The disc-shaped support end plate 21
A plurality of recesses (not shown) for engaging the opposing blades 23 are formed on the other side of the disc-shaped support member 22. The cross-flow fan 7 configured in this way is driven by an electric motor (not shown), but a rear guider 8 as shown in FIG. The stabilizer 10 is provided.

By the way, when the crossflow fan 7 rotates, a part of the wind toward the outlet 3 collides with the tongue surface of the stabilizer 10 and is sucked into the crossflow fan 7 again.
A large concentric vortex 12 eccentric to the crossflow fan 7 is generated at the blowout portion of the crossflow fan 7. When the blades 23 cut the vortex 12, pressure fluctuations occur there and noise called blade pitch noise is generated. This blade pitch sound is related to the number of rotations of the cross flow fan 7, the number of blades 23 (pitch P between blades), the size of the gap (front gap) S between the blades 23 and the stabilizer 10, and the gap S can be increased. If the blade pitch sound is reduced, the air blowing efficiency is reduced. Conversely, if the gap S is reduced, the air blowing efficiency is increased but the blade pitch noise is also increased. Therefore, as shown in FIG. 3B, as a cross flow fan 7 ′ capable of reducing the blade pitch noise without lowering the blowing efficiency, as shown in FIG. The one in which the tip portion is inclined in the same direction from the root is put into practical use. This is intended to improve noise by partially interfering what the conventional blade 23 was interfering with the stabilizer 10 with a line in parallel at a point.

[0004]

However, in the cross flow fan 7'as shown in FIG. 3B, all the blades 23 are inclined in the same direction, so that the vector of the force generated by the rotation is There is a problem that it works diagonally and the pressure balance on the left and right becomes uneven. Therefore, it is an object of the present invention to provide an air conditioner including a cross flow fan that has good pressure balance between the left and right sides and a good blowing efficiency, and that does not easily generate noise.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes at least a heat exchanger and a disc-shaped support member in an air passage connecting an inlet and an outlet. A cross formed by stacking a plurality of cup-shaped components having a plurality of blades arranged substantially radially in the side circumferential direction in the axial direction and connecting a disc-shaped support end plate to one side of the stacked components. In an air conditioner that is provided with a flow fan and blows air that has been heat-exchanged by the heat exchanger to the outlet, the tip end of the blade formed on the disc-shaped support member is rotated from the root. The first component that is inclined in the direction and the second component that is inclined in the counter-rotational direction are to be alternately laminated.

[0006]

With the above-mentioned structure, the components of the cross flow fan include the first component in which the tip end portions of the blades provided integrally with the disc-shaped support member are inclined in the rotational direction from the root, and the anti-rotation component. It consists of a second component tilted in the same direction, and by stacking these alternately, it improves the mechanical imbalance that is a drawback of the conventional cross flow fan in which all blades are tilted in the same direction. In addition, it is possible to change the form of the vortex flow generated during rotation, so that the generation of blade pitch noise can be further reduced, and accordingly, the gap between the crossflow fan and the stabilizer can be set smaller. Therefore, the ventilation efficiency can be increased.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of an indoor unit of an air conditioner. 1 is a main body composed of a plurality of components, 2 is a suction port for indoor air, 3 is air for heat exchanged by a heat exchanger described later. It is an outlet. In the air passage 4 connecting the suction port 2 and the air outlet 3, the air filter 5, the heat exchanger 6 bent in three directions, and the air heat-exchanged by the heat exchanger 6 are sent to the air outlet 3. A cross flow fan 7 is arranged. Behind the cross flow fan 7 is a rear guider 8 formed integrally with the main body 1,
A drain pan 9 that receives defrosting water from the heat exchanger 6 in the front
And a stabilizer 10 integrated therewith. Further, the outlet 3 is provided with an airflow direction adjusting plate 11 for vertically adjusting the airflow direction into the room.

FIG. 2 shows the relationship between the cross flow fan 7 and the stabilizer 10 and the rear guider 8 in front of and behind it, from the front upper part. The cross flow fan 7 includes a single disk-shaped support end plate 13 and a plurality of blades 15 integrally provided on one side of the disk-shaped support member 14 in the circumferential direction, and a plurality of components stacked in the axis 16 direction. However, in the cross flow fan 7 in this embodiment, the blades formed on the disc-shaped support member 14
A first component 17a in which the tip of 15 is inclined in the rotational direction from the root and a second component 17 in which the tip is inclined in the opposite rotational direction
2b, and these are alternately laminated as shown in FIG. A plurality of recesses (not shown) for engaging the opposing blades 15 are formed on the other side of the disc-shaped support end plate 13 and the disc-shaped support member 14.

With such a structure, the mechanical imbalance, which is a drawback of the conventional cross flow fan in which all the blades 15 are inclined in the same direction, can be improved, and the vortex flow 12 generated during rotation can be improved. Since it is possible to change the form of, it is possible to further reduce the generation of blade pitch sound. In the components 17a and 17b of the cross-flow fan 7 shown in FIG. 2, the blade pitch P (blade spacing) is almost equal, but the blade pitch P is the same. , By arranging the components with unequal pitches and connecting them alternately, the good balance performance of the components of equal pitch and the effect of reducing the blade pitch noise of the components of unequal pitch can be utilized. You can Further, by reducing the pitch P between the blades of the components 17a and 17b to be unequal, it is possible to further reduce the blade pitch sound.

[0010]

As described above, in the case of the cross flow fan as described above, the mechanical unbalance, which was a drawback of the conventional cross flow fan, is improved, so that the quality of the indoor unit is improved and the blade is also improved. Pitch noise is reduced, and an indoor unit that can be operated quieter is obtained.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an indoor unit of an air conditioner showing an application example of the present invention and a conventional cross flow fan.

FIG. 2 is a schematic configuration diagram of a crossflow fan showing an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a cross-flow fan showing a conventional example.

[Explanation of symbols]

 1 Main body 2 Suction port 3 Air outlet 4 Air passage 6 Heat exchanger 7 Cross flow fan 8 Rear guider 9 Drain pan 10 Stabilizer 11 Wind direction adjusting plate 12 Eddy current 13 Disc-shaped supporting end plate 14 Disc-shaped supporting member 15 Blade 16 Shaft 17a Composition Parts 17b Components

Claims (6)

[Claims] 1. A plurality of cup-shaped components having at least a heat exchanger in an air passage connecting the suction port and the air outlet and a plurality of blades provided substantially radially in one circumferential direction of the disc-shaped support member. Along with stacking in the axial direction, a cross flow fan formed by connecting disc-shaped support end plates to one side of the stacked components is provided, and the air heat-exchanged by the heat exchanger is delivered to the outlet. In an air conditioner configured to blow air,
A first component part in which a tip end portion of a blade formed on the disc-shaped support member is inclined in a rotation direction from a root and a second component part is inclined in a counter-rotation direction, and these are alternately laminated. An air conditioner characterized by 2. A first part of the cross flow fan.
The air conditioner according to claim 1, wherein the disk-shaped support member of the component is provided with a plurality of recesses for engaging the blades of the opposing second component. 3. A second component of the cross flow fan
The air conditioner according to claim 1, wherein the disk-shaped support member of the component is provided with a plurality of recesses for engaging the blades of the first component facing each other. 4. The air conditioner according to claim 1, wherein the blade intervals of the first and second constituent parts are equal. 5. The air conditioner according to claim 1, wherein the blades of one of the first and second constituent parts have unequal intervals. 6. The air conditioner according to claim 1, wherein the blade intervals of the first and second constituent parts are both unequal.