AU713064B2

AU713064B2 - Cross flow type blower

Info

Publication number: AU713064B2
Application number: AU75388/96A
Authority: AU
Inventors: Sim-Won Chin
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 1995-12-19
Filing date: 1996-12-17
Publication date: 1999-11-25
Anticipated expiration: 2016-12-17
Also published as: KR0141763B1; KR970045573A; AU7538896A; IN189900B; CN1157376A; CN1095524C

Description

'7 M'UM/U 11 28/5/91 Regulation 3.2(2)

AUSTRALIA

Patents Act 1990

ORIGINAL

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Invention Title: CROSS FLOW TYPE BLOWER The following statement Is a full description of this invention, including the best method of performing it known to us CROSS FLOW TYPE BLOWER BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross flow type blower, and in particular to an improved cross flow type blower which is capable of increasing the amount of wind by improving the shape of a rear guider without increasing a noise level in the system.

2. Description of the Conventional Art Generally, the performance of the cross flow type blower, which is used in a separation type air conditioner, is determined by combined characteristics such as an air flowing path and the shape of vanes of the cross flow fan.

Figure 1 is a side cross-sectional view illustrating a conventional cross flow type blower, and Figure 2 is a perspective view illustrating a conventional cross flow type 0* blower.

As shown therein, the conventional cross flow type blower includes a heat exchanger 1 for exchanging heat, a cross flow fan 2, which rotates in a clockwise direction for forming a vortex center, for introducing air into the system through the heat exchanger 1, a rear guider 3 for fixing the position of the 25 vortex center formed by the cross flow fan 2, reducing the 00 0 0 0e 0*00 0* 0** 0**000 flowing speed of air which was accelerated by the dynamic pressure generated by the cross flow fan 2, and discharging the air in static pressure, and a stabilizer 4 for forming a discharge outlet 5 in cooperation with the rear guider 3 and for defining inlet and outlet regions in the system.

The operation of the conventional cross flow type blower will now be explained with reference to the accompanying drawings.

First, when the cross flow fan 2 is rotated, the air is introduced through the heat exchanger i, for thus exchanging heat. Thereafter, the air in which the heat is exchanged forms a vortex center at a periphery of each vane of the cross flow fan 2. The position of this vortex center is severely changed at a periphery of each vane.

Here, therear guider 3 is intended for fixing the position of the vortex center which is severely changed, and changes the air which was accelerated through the cross flow fan 2 to a static pressure wind, for thus discharging the air to the outside through the discharge outlet 5 which is formed in cooperation with the stabilizer 4.

Here, the cross flow fan 2 and the rear guider 3 are important elements which affect the performance of the system.

The cross flow fan 2 affects the entire performance of the system by about 40%, and the rear guider 3 affects the entire performance of the system by about 9 2 .9 9 o9o9o9 9 9 However, when designing the rear guider 3, there are problems in determining the radius and the center of a curved portion thereof. Namely, the radius and the center of the curved portion of the rear guider 3 are determined based on nonexperiment basis, for thus degrading the reliability of the system.

Namely, the cross flow fan 10 affects the entire performance of the system by about 60%, and the cross flow fan is fabricated based on non-experiment basis, for thus degrading the efficiency of the system.

In addition, since the radial portion of the rear guider 3 is intended to be a double radial portion and an exponential radius, the discharge outlet 5 is made larger based on the characteristic of the radial portion, and the processes for designing the radial portion becomes complicated.

For example, when using the double radial portion, two radial centers must be accurately formed, and in the case of the exponential radial portion, the radius of the circular portion must be determined based on the positions of each radial 20 portion.

o SUMMARY OF THE INVENTION :.ll Accordingly, it is an object of the present invention to provide a cross flow fan which overcomes the problems S ••ego: encountered in the conventional art.

It is another object of the present invention to provide a cross flow type blower which is capable of increasing the amount of wind by improving the shape of a rear guider without increasing a noise level in the system.

To achieve the above objects, there is provided a cross flow type blower according to the present invention which includes a rear guider having a radius ratio of 75% 95% when a curve start angle is 25" 350, wherein the center of the circular portion of the rear guider is determined based on the following conditions: an angle of el is 130, an angle of 02 is 140, Rl' is 20%, and R2' is 30%, where 01 and 62 are angles, Rl' is Rl/D, R2' is R2/D where Rl' and R2' are radius ratios, R1 and R2 are radius, and D is the diameter of the cross flow fan.

Additional advantages, objects and features of the invention will become more apparent from the description which follows.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: 4 Figure 1 is a side cross-sectional view illustrating a conventional cross flow type blower; Figure 2 is a perspective view illustrating a conventional cross flow type blower; Figure 3 is a side cross-sectional view illustrating major portions of a rear guider of a cross flow fan according to the present invention, which portions must be considered as important factors when designing the system; Figure 4 is a graph illustrating the relationship between a static pressure and a wind amount based on a design factor "R3" of a rear guider of a cross flow type blower according to the present invention; and Figure 5 is a table illustrating a noise characteristic based on a design factor "R3" of a rear guider of a cross flow type blower according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION The same elements as in the conventional art are given the same reference numerals with respect to an embodiment of the present invention.

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S. i yure j Is a siae cross-sectional view illustrating major portions of a rear guider of a cross flow fan according to the present invention, which portions must be considered as important factors when designing the system.

As shown therein, one of the major design elements is the position of the radial center of the radial portion R3 of the rear guider 3.

The outer position of the radius can be expressed as points A, B, and C, angles of 1el, e2, and radius ratios of RI'(Rl/D) and R2'(R2/D) (where Ri, R2 denote a radius, respectively, and D denotes the diameter of the cross flow fan).

In other words, the area encircled by the points A, B, C, and D is one of major design factors.

Based on the repeated experiments, the angle of 01 is preferably 1300, the angle of 02 is 1400, the radius ratio of R1' is 20% with respect to the outer diameter of the fan, and the radius ratio of R2' is 30% with respect to the outer diameter of the fan.

In addition, another major design factor is the radius ratio (R3'=R3/D) (where R3 is the radius, and D is the diameter of the cross flow fan). The expansion ratio of the radius of the rear guider 3 is determined by the above-described ratio.

Figure 4 is a graph illustrating the relationship between a static pressure and a wind amount based on a design factor "R3" of a rear guider of a cross flow type blower according to the present invention.

As shown therein, Figure 4 illustrates a system resistance curve in the case of the heat exchanger 1. The intersection 25 points of the static pressure and the wind amount are X, Y, and ee.

In addition, the radius ratio R3' is increased as 75%, and 85%, for thus obtaining a desired characteristic of the curve of the static pressure and wind amount.

Figure 5 is a table illustrating a noise characteristic based on a design factor "R3" of a rear guider of a cross flow type blower according to the present invention.

As shown therein, as the radius ratio R3' is increased, the noise is reduced.

The radial range of the rear guider 3 and the radius of the curve can be expressed as the radius ratio which is obtained by dividing the angle of the radius by the diameter of the cross flow fan 2. The reference of the angle is a start angle of 00 of the curve of the rear guider 3. This angle has a predetermined value within an angle of 30 based on the structural characteristic of the cross flow fan As described above, the cross flow type blower according to the present invention is basically directed to improving the shape of the rear guider 3 in order for the range of the radius ratio of the rear guider 3 to be within 75% through 95% when the curve start angle of the rear guider has an angle of 25 350, for thus increasing the amount of wind by 20% 30% without increasing the noise level.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in .*7 7 the art will appreciate that various modifications, additions and substitutions are possible, without departing f rom the scope and spirit of the invention as recited in the accompanying claims.

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Claims

1. A cross flow type blower, including: a rear guider having a radius ratio of 75% 95% when a curve start angle is 250 350.

2. The cross flow type blower of claim 1, wherein a center of a circular portion of the rear guider is determined based on the following conditions: an angle of 61 is 130, an angle of 02 is 140, R1' is 20%, and R2' is 30%, where 01 and 02 are angles, R1' is R1/D, R2' is R2/D where RI' and R2' are radius ratios, R1 and R2 are radius, and D is the diameter of the cross flow fan.

3. A blower as claimed in claim 1 substantially as herein described with reference to the accompanying drawings. DATED this 27th day of September 1999 a LG ELECTRONICS INC 0 WATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 S. AUSTRALIA RCS:SMM:VRH DOC 29 AU7538896.WPC