JP3106165B2 - Cross flow fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow fan arranged in an indoor unit constituting an air conditioner, for example, and for blowing air to be conditioned in a room to be conditioned.

[0002]

2. Description of the Related Art An indoor blower is arranged together with an indoor heat exchanger in an indoor unit constituting an air conditioner.
Due to recent housing circumstances, there is a great demand for suppressing the height of the indoor unit, and therefore the width of the indoor heat exchanger also tends to be long.

[0003] In order to obtain uniform heat exchange efficiency of the heat exchanger, the above-mentioned indoor blower for blowing the air to be conditioned to the indoor side heat exchanger has a blowing range almost the same length as the width. is necessary.

[0004] Therefore, among various types of blowers, a cross flow fan which has a particularly long axial length and can obtain a wide range of blowing is most suitable.

FIG. 5A shows a basic configuration of a cross flow fan.

[0006] Both side plates 1, 1 provided with a shaft portion 1a at the center thereof, partition plates 2, ... arranged at predetermined intervals in the axial direction between these side plates 1, 1; 1 and a plurality of blades 3 interposed between the partition plates 2 and arranged along the circumferential direction at the peripheral end.

As shown in FIG. 5 (B), in the manufacture of a cross flow fan, a multi-blade is formed by previously projecting a partition plate 2 and a plurality of blades 3 on one side surface of the partition plate 2. The mold impeller 4 is manufactured.

[0008] The multi-blade type impeller 4 is stacked along the axial direction. That is, the partition plate 2 of the lower multi-blade impeller 4
The top edge of the blade 3 of the upper multi-blade impeller 4 rests on the upper surface.

Next, a horn H constituting ultrasonic welding means is applied to the upper surface of the partition plate 2 of the upper impeller 4 to apply ultrasonic energy. The ultrasonic energy is concentrated on the leading edge of the integral blade 3 via the partition plate 2 as shown by the dashed arrow in the drawing, and generates ultrasonic vibration.

The leading edge of the blade 3 is located on the lower partition plate 2.
When the blade 3 is ultrasonically vibrated at its leading edge, frictional heat is generated between the blade 3 and the lower partition plate 2. If ultrasonic energy is supplied continuously for a predetermined time, the tip of the upper blade 3 and the lower partition plate 2
And the upper and lower impellers 4 and 4 are integrated with each other.

Conventionally, many attempts have been made to improve the blowing efficiency and to reduce the blowing noise, especially for the blade 3.

Japanese Patent Application Laid-Open No. Sho 60-17296 discloses FIG.
A blade structure is disclosed as shown in FIG.

Each of the blades 3 has the same shape and structure such as a chord length and a radius of curvature, but the angles θ between the adjacent blades 3 and 3 and the center point O are different from each other (θ _1). ≠ θ ₂ ≠ θ ₃ …) and blade 3
Are unequal in arrangement pitch along the circumferential direction.

Such a structure is characterized in that the arrangement of the blades 3 along the circumferential direction is asymmetrical.
Since the center of gravity of the rotating shaft and the center of gravity of the fan are different, imbalance during rotation increases.

Therefore, a weight (weight) for adjusting the balance is required. However, mounting the weight as a separate component is troublesome and troublesome, and causes a problem that the material cost and the number of mounting steps are increased.

Japanese Patent Application Laid-Open No. 4-164195 discloses FIG.
A configuration for removing the above-described disadvantages as shown in (A) and (B) is disclosed.

That is, the blade 3 is provided on one side of the partition plate 2.
In the manufacturing stage of the multi-blade impeller 4 in which the blade 3 is formed integrally, the uneven thickness portion 5 is provided integrally on the side surface opposite to the side surface on which the blade 3 is projected, so that it has a balancer function as a substitute for the weight. ing.

[0018]

As shown in FIG. 8, in such a fan, an uneven thickness portion 5 is provided on the side opposite to the side where the blade 3 is located. Further, a horn H as an ultrasonic welding means is applied.

Therefore, the horn H easily comes into contact with the uneven thickness portion 5, and there is a large possibility that the ultrasonic energy is not transmitted to the necessary welding portion.

In order to reliably avoid contact with the horn H,
Although there is a method of selecting the position of the uneven thickness portion 5, in order to efficiently supply ultrasonic energy to the tip of the blade 3, the horn H is applied to the peripheral end of the partition plate 2 on which the blade 3 is provided. Therefore, the uneven thickness portion 5 is necessarily selected at a position near the rotation center axis OL.

However, the magnitude of the unbalance correction amount is determined by the product (W × Lb) of the weight W of the uneven thickness portion 5 and the distance Lb from the center of gravity of the uneven thickness portion 5 to the rotation center axis OL.

As described above, when the uneven thickness portion 5 is provided near the rotation center axis OL, the distance Lb between the center of gravity of the uneven thickness portion 5 and the rotation center axis OL is inevitably reduced. Must be large. Therefore, there is a problem that the material cost is increased and molding is difficult.

Further, since the uneven thickness portion 5 is provided in the vicinity of the rotation center axis OL, the partition plate 2 cannot be formed in a hollow structure, so that the fan weight increases more than necessary, the material cost increases, and the inertia of the fan rotation increases. The energy required for the increase of the moment and the rotation of the fan increases. At the same time, the ventilation efficiency is deteriorated, the pressure loss due to the viscosity of the partition plate 2 wall surface at the time of ventilation is increased, and the air volume is reduced.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an ultrasonic welding method without changing the basic structure in which the uneven thickness portion is provided integrally with the partition plate. No contact with the horn as a means, it is possible to reduce the thickness unevenness, the partition plate can be hollow structure, prevent unnecessary weight increase, reduce material costs and improve air blowing efficiency It is intended to provide a cross flow fan that can be achieved.

[0025]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a plurality of partition plates arranged at predetermined intervals in an axial direction, and between the partition plates and at the peripheral end of the partition plate. In this circumferential direction, a multi-blade type blade is provided in which blades whose arrangement pitch is set to a combination of a plurality of lengths are interposed, and the blade is integrally provided on one side surface of the partition plate. A plurality of wheels are provided, and the blades of the other blade are brought into contact with the partition plate of one blade, and the blades of the blade are connected and fixed by ultrasonic welding means. The cross flow fan is characterized in that an uneven thickness portion for absorbing imbalance around the rotation axis is provided on a partition plate of the multi-blade type impeller and on the same side surface as the side surface where the blade is located. It is a cross flow fan.

[0026]

Since the uneven thickness portion is provided on the same side surface of the partition plate as the side surface on which the blade is located, the horn does not contact the uneven thickness portion when the multi-blade impellers are ultrasonically welded to each other.

Therefore, the position of the uneven thickness portion can be selected at a position close to the peripheral end near the blade, and the distance from the rotation center axis can be increased. The thickness deviation can be reduced, and the number of man-hours for unbalance adjustment is reduced.

Since the uneven thickness portion is closer to the blade, the partition plate can have a hollow structure, which leads to a reduction in the weight of the entire fan.

[0029]

An embodiment of the present invention will be described below with reference to the drawings.

The basic configuration of the cross flow fan is as described above with reference to FIG.

Further, as described above with reference to FIG.
Each blade 3 has the same shape and structure, such as a chord length and a radius of curvature, but the angles θ formed between the adjacent blades 3 and 3 and the center point O are different from each other (θ ₁ ≠ θ ₂ ≠). θ
₃ ...) And the arrangement pitch along the circumferential direction of the blade 3 is assumed to be unequal.

As shown in FIG. 1, in the process of manufacturing the cross flow fan, a multi-blade type impeller in which a partition plate 2A and a plurality of blades 3 are integrally protruded on one side surface of the partition plate 2A in advance. Build 4A.

Here, the partition plate 2A has a hollow structure for the reason described later.

Further, on the same side surface as the surface on which the blade 3 of the partition plate 2A protrudes, an uneven thickness portion 5A as a balancer is provided.
Are provided integrally.

In other words, the uneven thickness portion 5 is located near the blade 3.
A is provided, and the distance La between the center of gravity of the uneven thickness portion 5A and the rotation center axis OL of the multi-blade impeller 4A can be made as large as possible.

The magnitude of the unbalance correction amount depends on the uneven thickness 5
It is determined by the product (W × La) of the weight W of A and the distance La from the center of gravity of the uneven thickness portion 5A to the rotation center axis OL.

In the structure of the present invention, the distance La between the center of gravity of the uneven thickness portion 5A and the rotation center axis OL is made as large as possible. As a result, the thickness unevenness can be reduced, and the unbalance correction amount can be reduced. Yes.

Further, since the uneven thickness portion 5A is provided at a position near the peripheral end near the blade 3, the central axis portion of the partition plate 2A does not need any particular plate portion. That is, a hollow structure having the hollow portion 10 can be obtained. Since the weight of the uneven thickness portion 5A is reduced and the partition plate 2A has a hollow structure, the weight of the entire fan can be reduced.

In manufacturing the cross flow fan, the multi-blade type impellers 4A are stacked up and down, and a horn H as an ultrasonic welding means is brought into contact with the partition plate 2 of the upper side impeller 4A to apply ultrasonic energy. First, the same operation as described with reference to FIG.

The ultrasonic energy is concentrated on the contact portion between the tip edge of the upper blade 3 and the lower partition plate 2A, and the ultrasonic welding is performed. At this time, the uneven thickness portion 5A has the horn H The uneven thickness portion 5A does not interfere with the horn H. Ultrasonic energy is uneven part 5
Instead of concentrating on A, it is surely concentrated on a predetermined necessary place.

FIG. 3A shows a partition plate 2 having such a structure.
7 shows a wind speed vector formed on the blow-out side when the cross flow fan having A is rotationally driven. This is a result obtained by having the hollow portion 10 in the partition plate 2A, and it can be seen that the blowing amount is extremely large.

FIG. 3B shows a wind velocity vector in a conventional cross flow fan provided with one partition plate 2 which cannot employ a hollow structure. It can be seen that the air volume is smaller than that of the fan of the present invention.

FIG. 4A shows a state in which the multi-blade impellers 4Aa are ultrasonically welded to each other when the fan diameter Da ^φ is small.

[0044] FIG. 4 (B) shows the case where the fan diameter Db ^phi is large, the multi-blade impeller 4Ab mutual state of ultrasonic welding.

Regardless of the fan diameter Da ^φ , Db ^φ , the necessary uneven thickness portions 5Aa, 5Ab
Since the horns H are provided integrally and are not provided on the partition plates 2Aa and 2Ab sides to which the horns H are applied, ultrasonic welding using the same horns H is possible.

[0046]

As described above, according to the present invention, in the partition plate of the multi-blade type impeller, an unbalanced portion for absorbing imbalance around the rotation axis is provided on the same side surface as the side surface where the blade is located. Since the thick portion is provided, the uneven thickness portion does not need to contact the horn as the ultrasonic welding means at all without changing the basic configuration of integrally providing the uneven thickness portion with the partition plate.

Therefore, the weight of the uneven thickness portion can be reduced, and the partition plate can have a hollow structure, so that the weight of the fan can be prevented from increasing more than necessary, and the effects such as reduction of material costs and improvement of blowing efficiency can be achieved. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a multi-blade impeller constituting a cross flow fan according to an embodiment of the present invention.

FIG. 2A is a longitudinal sectional view of the multi-blade impeller, showing the embodiment. (B) is a schematic bottom view of the multi-blade impeller.

FIG. 3A is a diagram illustrating a wind speed vector of a cross flow fan according to the embodiment. (B) is a figure showing the wind velocity vector of a cross flow fan of a conventional structure.

FIGS. 4A and 4B are explanatory diagrams of ultrasonic welding of multi-blade impellers having different fan diameters from each other.

FIG. 5A is a perspective view of a general cross flow fan.
(B) is an explanatory view of ultrasonic welding of multi-blade type impellers.

FIG. 6 is a diagram illustrating a blade pitch of a cross flow fan.

FIG. 7A is a longitudinal sectional view of a conventional multi-blade impeller. (B) is a schematic bottom view of the multi-blade impeller.

FIG. 8 is an explanatory view of ultrasonic welding of a multi-blade type impeller of a conventional structure.

[Explanation of symbols]

2A: partition plate, 3: blade, 4A: multi-blade impeller, H
... Ultrasonic welding means (horn), 5A.

Claims (1)

(57) [Claims] 1. A plurality of partition plates disposed at predetermined intervals in an axial direction, and a plurality of partition plates interposed between the partition plates and at a peripheral end of the partition plates along the circumferential direction. A plurality of multi-blade type impellers, the arrangement pitch of which is set to a combination of a plurality of lengths; In the cross flow fan configured by abutting the blade of the other multi-blade impeller on the partition plate of the vane-type impeller and connecting and fixing the multi-blade impeller to each other by ultrasonic welding means, A cross flow fan, wherein an uneven wall portion for absorbing imbalance around a rotation axis is provided on a partition plate of an impeller and at the same side surface portion as a side surface where a blade is located.