JP4147560B2 - Air conditioner - Google Patents

Description

  The present invention relates to an air conditioner, and more particularly, to an air conditioner in which noise, input, and rotation speed of a crossflow fan necessary for obtaining a predetermined air volume are reduced.

  A conventional air conditioner has a vertical portion with a lower end inclined backward in an air passage connecting a suction port provided in the upper front surface and / or upper surface of a main body and a blowout port provided in a lower front surface. A heat exchanger composed of a rear inclined portion bent upward at the upper end and a lower inclined portion bent rearward at the rear end thereof is provided so that a part of the blown air flow can be circulated to the heat exchanger ( For example, see Patent Document 1).

  In addition, the conventional air conditioner has an air inlet for indoor air at the upper front and upper surfaces of the indoor unit main body, and a conditioned air outlet at the lower front, combined in a λ shape above the crossflow fan. In the state, a front-side heat exchanger and a rear-side heat exchanger consisting of fin-tube heat exchangers are arranged, and the front area and heat transfer area of the rear-side heat exchanger are made larger than that of the front-side heat exchanger. (For example, see Patent Document 2).

JP-A-11-281080 (paragraphs 0011 to 0018, FIG. 1) JP 2000-329364 A (paragraphs 0009 to 0015, FIG. 1)

In the conventional air conditioner, both the rear inclined part, which is the upper part of the front heat exchanger of Patent Document 1, and the front side heat exchanger of Patent Document 2, are separated from the suction port. The distance to the heat exchanger is likely to be short, the blade incident angle in the cross flow fan suction area is large, and it is easy to stall, so the noise, input, and rotation speed of the cross flow fan required to obtain the specified air volume are large. There was a problem of becoming.
The present invention has been made to solve the above-described problems. The distance between the cross flow fan and the front upper heat exchanger is increased, and noise, input, and input of the cross flow fan necessary to obtain a predetermined air volume. It aims at providing the air conditioner which reduced the rotation speed.

An air conditioner according to the present invention is an air equipped with a crossflow fan, a front upper heat exchanger composed of fin tubes, a front lower heat exchanger and a rear heat exchanger, an air purifying filter, and an electric dust collector. In the conditioner, the electric dust collector is disposed on the windward side of the front upper heat exchanger, and the horizontal line X drawn from the uppermost point A of the front upper heat exchanger and the rotation center point of the crossflow fan The point of intersection with the perpendicular line Y drawn from O is point B, the point of intersection of the vertical line Z drawn from the leftmost point C of the air purifying filter and the horizontal line X is D, and it is drawn from the lowest point E of the air conditioner The intersection of the horizontal line V and the vertical line Y is F, the intersection of the vertical line Z and the horizontal line V is G, and the point on the cross flow fan side line is perpendicular to the front upper heat exchanger. I and the line segment passing through the intersection D The angle between the horizontal line W drawn from the point I and the line segment length DI is θ, and the shortest distance between the crossflow fan and the front heat exchanger is the distance of the front heat exchanger. When it is 1.25 to 2.5 times the pipe diameter,
0.68 ≦ OF / (DG−DIsin θ) ≦ 0.73
The cross flow fan is disposed so that

In the air conditioner according to the present invention, the electric dust collector is disposed on the windward side of the front upper heat exchanger, and the horizontal line X drawn from the uppermost point A of the front upper heat exchanger and the rotation of the cross flow fan The point of intersection with the vertical line Y drawn from the center point O is point B, the point of intersection of the vertical line Z drawn from the leftmost point C of the air purifying filter and the horizontal line X is D, and from the lowest point E of the air conditioner The intersection of the drawn horizontal line V and the vertical line Y is F, the intersection of the vertical line Z and the horizontal line V is G, and is perpendicular to the front upper heat exchanger and on the line on the cross flow fan side. The length of a line segment passing through the point I and the intersection D is DI, the angle formed by the horizontal line W drawn from the point I and the line segment length DI is θ, the crossflow fan and the front surface The shortest distance from the heat exchanger is 1.25 to 2 of the pipe diameter of the front heat exchanger. When doubled, such that 0.68 ≦ OF / (DG-DIsinθ ) ≦ 0.73, since disposing the cross flow fan, it is possible to reduce the input of the cross-flow fan.

Embodiment 1 FIG.
1 is a cross-sectional view of an indoor unit of an air conditioner according to Embodiment 1 of the present invention.
As shown in FIG. 1, the indoor unit 11 is provided in the front panel 31, the suction port 10 provided on the inner side and the upper surface of the front panel 31, the air outlet 9 provided on the lower surface, and the suction port 10. An air purification filter 5, a front lower heat exchanger 3 provided to face the front suction port 10, and a front upper heat exchanger 2 provided to be inclined so as to face the front and upper suction ports, respectively. The upper edge portion is disposed in contact with the upper edge portion of the front upper heat exchanger 2 so as to face the suction port 10 on the upper surface, and the lower edge portion is inclined in a direction away from the front upper heat exchanger 2. The rear heat exchanger 4, the cross flow fan 1 provided corresponding to the outlet 9, and a stabilizer 23 and a rear guider 24 that allow the air from the cross flow fan 1 to flow smoothly.

The front upper heat exchanger 2 and the front lower heat exchanger 3 have the upper half as the front upper heat exchanger 2 and the lower half as the front lower heat exchanger 3 in the number of stages of the front heat exchanger. Is also a finned tube heat exchanger.
The front upper heat exchanger 2 has substantially the same shape as the air purification filter 5 and is disposed along the back surface of the air purification filter 5.

Next, operation | movement of the indoor unit 11 of the air conditioner of Embodiment 1 of this invention is demonstrated with reference to FIGS.
When the cross flow fan 1 is rotated by the operation of a fan motor (not shown), the air outside the indoor unit 11 is sucked from the suction port 10, and the front lower heat exchanger 3, the front upper heat exchanger 2, the rear heat. The air is blown out from the air outlet 9 via the exchanger 4 and the cross flow fan 1. Here, the front lower heat exchanger 3, the front upper heat exchanger 2, and the rear heat exchanger 4 exchange heat with air, and cool the air during the cooling operation and heat the air during the heating operation.

Here, the results of experiments on the fan motor input, the noise value, and the rotational speed when the shortest distance L between the front upper heat exchanger 2 and the air purifying filter 5 is 3 to 20 mm are shown in FIGS. This will be described with reference to FIG.
In FIG. 1, the distance L between the front upper heat exchanger 2 and the air purification filter 5 is perpendicular to the front upper heat exchanger 2 from the point A on the air purification filter 5 side line of the front upper heat exchanger 2. When the point of intersection with the air cleaning filter 5 is point B, the length of the line segment AB is L [mm]. When there are a plurality of air purification filters 5, the distance between the air purification filter 5 closest to the front upper heat exchanger 2 and the front upper heat exchanger 2 is used. FIG. 1 shows a case where the distance between the front upper heat exchanger 2 and the air purification filter 5 is 3 mm, for example.
Further, the rotation center point of the cross flow fan 1 is indicated by O, and the suction area is indicated by 15.

FIG. 2 shows the relationship between the fan input of the cross flow fan 1 and the length L when the air flow rate from the indoor unit 11 is 15 m ³ / min. FIG. 3 shows the air flow rate from the indoor unit 11 being 15 m ³ / min. 4 shows the relationship between the noise value of the indoor unit 11 and the length L, and FIG. 4 shows the relationship between the rotational speed of the cross flow fan 1 and the length L when the amount of air blown from the indoor unit 11 is 15 m ³ / min. FIG.
As shown in FIGS. 2 to 4, the experimental results show that the smaller the length L, the smaller the fan input, noise value, and rotational speed of the cross flow fan 1.

Next, this reason will be described based on the calculation result of the distribution of the incident angle in the suction region 15 of the crossflow fan 1 with respect to the distance L between the front upper heat exchanger 2 and the air cleaning filter 5.
FIG. 5 is an explanatory view of the incident angle with respect to the blades of the crossflow fan, and FIG. 6 is a distance L between the front upper heat exchanger 2 and the air purifying filter 5 being 3 mm, 10 mm, and 20 mm. 15 is a diagram illustrating a result of an experiment on an incident angle distribution at 15. FIG.
As shown in FIG. 5, the center of the arc portion 17 at the tip of the outer peripheral side of the blade 16 of the cross flow fan 1 is a point P and the middle point is a point Q. The angle formed between the straight line PQ and the inflow velocity vector 18 when represented by the relative velocity field of the air to the blade 16 is an incident angle 19. However, the direction of the arrow 20 is a positive direction.

  In FIG. 6, the angle of the horizontal axis is the angle formed by the center of rotation of the cross flow fan 1, the point O and the point Q shown in FIG. 5, and as shown in FIG. The angle α is the angle when the perpendicular is lowered and the point Q is located on the perpendicular and the angle is 0 ° and the rotational direction of the crossflow fan 1 is positive.

  As shown in FIG. 6, the experimental results show that the incident angle 19 in the suction region 15 of the crossflow fan 1 is small when the angle α is 90 ° to 150 °, and the length L is as small as 20 mm, 10 mm, and 3 mm. The incident angle became smaller as the angle reached, and when the length L was 3 mm, the incident angle became the smallest at 0 °. As the incident angle becomes smaller, it becomes difficult to stall, so that the efficiency of the cross flow fan 1 is improved.

  As shown in FIGS. 2 to 4, the reason why the performance of the cross flow fan 1 is improved is that the incident angle 19 in the suction region 15 of the cross flow fan 1 is reduced, and that the front upper heat is increased as the length L is reduced. Since the front area of the exchanger 2 can be increased and a predetermined air volume is obtained, the passing air speed of the front upper heat exchanger 2, the front lower heat exchanger 3, and the rear heat exchanger 4 is reduced, so that the front upper heat exchange is performed. This is due to the effect of reducing the pressure loss of the heat exchanger 2, the front lower heat exchanger 3, and the rear heat exchanger 4.

  This indicates that the distance between the cross flow fan 1 and the upper front heat exchanger 2 is better. Therefore, as shown in FIGS. 2, 3, and 4, the smaller the length L, the greater the distance between the cross flow fan 1 and the front upper heat exchanger 2, and the fan input necessary to obtain a predetermined air flow. Noise level and rotation speed become smaller.

  Accordingly, the substantially vertical straight line portion 5b, the substantially horizontal straight line portion 5a, and the curve 5c of the air purifying filter 5 vary depending on the outline of the indoor unit 11 and cannot be defined in general. In order to improve, in the determined outline, the substantially vertical straight line portion 5b, the substantially horizontal straight line portion 5a, the curved line portion 5c is as close as possible to the outline line, and the front upper heat exchanger 2 is as much as possible, It is better to approach the air cleaning filter 5.

  As described above, in the conventional air conditioner, the fixing part (not shown) for fixing the air purifying filter 5 needs to have a thickness of 3 to 15 mm, and the length L should be smaller than the thickness of the fixing part. However, when the distance between the front upper heat exchanger and the air purifying filter is large, there is a problem that the fan input, the noise value, and the rotational speed of the cross flow fan 1 necessary for obtaining a predetermined air volume are large. In the air conditioner according to Embodiment 1 of the present invention, the front shape of the front upper heat exchanger 2 is substantially the same as the back shape of the air purification filter 5 and is arranged along the back surface of the air purification filter 5. Since the distance between the cross flow fan 1 and the front upper heat exchanger 2 is increased by reducing the distance L between the front upper heat exchanger 2 and the air purifying filter 5, the cross flow necessary for obtaining a predetermined air volume is obtained. Fan Input § down 1, noise level, it is possible to reduce the rotational speed.

Embodiment 2. FIG.
In the first embodiment, the front upper heat exchanger 2 is substantially the same as the shape of the air purification filter 5 and is disposed along the inner surface of the air purification filter 5, but this embodiment cannot be performed in this way. It shows about the case.
FIG. 7 is a view showing a cross-sectional view of an indoor unit of an air conditioner showing Embodiment 2 of the present invention, and FIGS. 8 and 9 are views showing a cross flow fan input of the air conditioner.
In FIG. 7, the same or corresponding parts as those in FIG. The electric dust collector 22 is disposed on the windward side of the front upper heat exchanger 2, and the front surface of the front upper heat exchanger 2 is not disposed along the inner surface of the air purification filter 5.
The front upper heat exchanger 2, the front lower heat exchanger 3, and the rear heat exchanger 4 are fin tube heat exchangers.

Next, operation | movement of the indoor unit of the air conditioner of Embodiment 2 of this invention is demonstrated with FIGS.
When the cross flow fan 1 is rotated by the operation of the fan motor, the air outside the indoor unit 11 is sucked from the suction port 10 and passes through the electric dust collector 22, the front upper heat exchanger 2, and the cross flow fan 1. The air is blown out from the air outlet 9 and blown out from the air outlet 9 through the front lower heat exchanger 3, the back heat exchanger 4, and the cross flow fan 1.
Here, the front upper heat exchanger 2, the front lower heat exchanger 3, and the rear heat exchanger 4 exchange heat with air, cool the air during the cooling operation, heat the air during the heating operation, and collect the electric dust. Air dust is collected by the vessel 22 and blown out.

Here, the relationship between the position of each component of the indoor unit 11 and the fan input will be described.
In FIG. 7, the intersection of the horizontal line X drawn from the uppermost point A of the front upper heat exchanger and the rotation center of the cross flow fan, the perpendicular Y drawn from the point O is point B, and the leftmost end of the air purification filter The intersection of the perpendicular Z drawn from the point C and the horizontal X is point D, the intersection of the horizontal V drawn from the lowest point E of the air conditioner and the perpendicular Y is F, and the perpendicular Z and horizontal V A horizontal line drawn from point I, where D is the length of the line segment passing through point I and point D on the vertical and crossflow fan side line with respect to the front upper heat exchanger as G The angle formed by W and the line segment DI is θ.
The front upper heat exchanger 2 has three rows and a thickness of 35.1 mm. The electrostatic precipitator 22 is arranged on the windward side of the front upper heat exchanger 2 and has a thickness of 33 mm. The radius R is 52.5 mm, DG = 280 mm, and θ = 58 °.

  In this configuration, if the line segment DI is lengthened, there is an advantage that the thickness of the electrostatic precipitator 22 is increased and the design freedom of the indoor unit 11 is improved, but the cross flow fan 1 and the front upper heat exchanger 2 are improved. Therefore, there is a problem that the performance of the crossflow fan 1 is deteriorated as described in the first embodiment.

Further, if the rotation center point O of the crossflow fan 1 is disposed on the lower side, the distance between the crossflow fan 1 and the front upper heat exchanger 2 can be increased, but in this case, OF is shortened, The static pressure gauge (<0 [Pa]) in the vicinity of the region N of the rear guider 24 decreases, and the differential pressure with the indoor space (static pressure gauge is 0 [Pa]) increases. A force 29 is directed from the space toward the outlet 9, and this force is opposite to the air flow direction inside the indoor unit 11. As the differential pressure increases, the force 29 increases, the load applied to the cross flow fan 1 increases, and the fan input increases.
Accordingly, since (DG-DIsin θ) increases as DI and θ become smaller, the distance between the cross flow fan 1 and the front upper heat exchanger 2 can be increased, and the length of the OF can be increased. There is an OF / (DG−DIsin θ) that is advantageous to the performance of the fan 1 but has a minimum fan input for the defined DG, DI, and θ.

Therefore, when the shortest distance between the cross flow fan 1 and the lower front heat exchanger 3 passes through the rotation center point O and the intersection with the lower front heat exchanger 3 is a point J, the length (OJ-R) The minimum value,
The results of experiments on the relationship between fan input and OF / (DG-DIsin θ) when the shortest distance OJ-R is 10 and 20 mm will be described with reference to FIGS.
As a result of the experiment, the outer diameter of the pipe 30 in the vicinity of the point J is φ8 mm, and when the shortest distance is less than 10 mm, abnormal noise is generated by the flow from the vicinity of the point J toward the cross flow fan 1. Further, even when the shortest distance was larger than 20 mm, the noise value when obtaining a predetermined air volume did not change, so the shortest distance was set to 10 to 20 mm.

  When the shortest distance is 10 mm, GF = 105.6 mm, and when the shortest distance is 20 mm, GF = 115.6 mm, and the front lower heat exchanger 3 and the air purifying filter 5 are placed close to each other so that the GF does not become long. When changing the OF by changing the rotation center of the cross flow fan 1 and the position of the point O, the cross flow fan 1, the stabilizer 23, and the rear guider 24 are moved upward so that the length of the DG does not change. When the lower part 25 of the rear guider 24 is lengthened and the front lower heat exchanger 3 is shortened, and when moving downward, the downstream part 25 of the rear guider 24 is shortened and the front lower heat exchanger 3 is lengthened. is there.

  When the shortest distance between the crossflow fan 1 and the front lower heat exchanger 3 is 10 mm, as shown in FIG. 8, when the shortest distance between the crossflow fan 1 and the front lower heat exchanger 3 is 10 mm, OF When / (DG-DIsin θ) is 0.72, the fan input is minimum when the blown air volume is 15 m 3 / min. Since the measurement error is about 2 W, it is assumed that the fan input is minimum when 0.68 ≦ OF / (DG−DIsin θ) ≦ 0.75.

  When the shortest distance between the cross flow fan 1 and the lower front heat exchanger 3 is 20 mm, as shown in FIG. 9, when OF / (DG-DIsin θ) is 0.7, the blown air volume is 15 m 3 / min. The fan input at the time became the minimum. Since the measurement error is about 2 W, the fan input is minimized when 0.66 ≦ OF / (DG−DIsin θ) ≦ 0.73.

Thus, when the range of 0.68 ≦ OF / (DG−DIsin θ) ≦ 0.73 is satisfied, when the shortest distance between the cross flow fan 1 and the front lower heat exchanger 3 is 10 to 20 mm, the fan input is Get smaller.
In addition, since the outer diameter of the pipe 30 of the front lower heat exchanger 3 is φ8 mm, the shortest distance of 10 to 20 mm is expressed in relation to the pipe diameter, and the shortest distance of 10 to 20 mm is the pipe diameter of 1.25 to 2.5. Is double.
When the shortest distance between the cross flow fan 1 and the front lower heat exchanger 3 is small, the rotation center point O of the cross flow fan 1 is disposed on the lower side, and the distance between the cross flow fan 1 and the front upper heat exchanger 2 is set. When the shortest distance is large, the distance between the cross flow fan 1 and the front upper heat exchanger 2 becomes large. Therefore, the rotational center point O of the cross flow fan 1 is arranged on the lower side. It is better to increase the static pressure in the region N.

As is clear from the above results, the shortest distance between the cross flow fan 1 and the front lower heat exchanger 3 is set to 1.25 to 2.5 times the pipe diameter of the front heat exchanger, and 0.68 ≦ OF / When (DG−DIsin θ) ≦ 0.73, the fan input can be reduced.
In this embodiment, the case where the pipe diameter is φ8 mm and the shortest distance between the cross flow fan and the front lower heat exchanger is 10 to 20 mm has been described, but the case where the pipe diameter is φ7 mm or φ6.35 mm is also described. When the shortest distance is less than 10 mm, an abnormal sound is generated, and the noise value does not change even if it is larger than 20 mm.

It is sectional drawing of the indoor unit of the air conditioner concerning Embodiment 1 of this invention. It is a related figure of the distance of the fan input of the cross flow fan of the indoor unit of the air conditioner concerning Embodiment 1 of this invention, and the front upper heat exchanger, and an air purifying filter. It is a related figure of the noise value of the indoor unit of the air conditioner concerning Embodiment 1 of this invention, and the distance of a front upper heat exchanger and an air purifying filter. It is a related figure of the rotation speed of the cross flow fan of the indoor unit of the air conditioner concerning Embodiment 1 of this invention, and the distance of a front upper heat exchanger and an air purifying filter. It is explanatory drawing of the incident angle with respect to the blade | wing of the crossflow fan of the indoor unit of the air conditioner concerning Embodiment 1 of this invention. It is a figure which shows distribution of the incident angle in the suction area | region of the crossflow fan with respect to the distance of the front upper heat exchanger of the indoor unit of the air conditioner concerning Embodiment 1 of this invention, and the distance of an air purifying filter. It is a block diagram of the indoor unit of the air conditioner which shows Embodiment 2 of this invention. It is a figure showing the fan motor input of the indoor unit of the air conditioner which shows Embodiment 2 of this invention. It is a figure showing the fan motor input of the indoor unit of the air conditioner which shows Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cross flow fan, 2 Front upper heat exchanger, 3 Front lower heat exchanger, 4 Rear heat exchanger, 5 Air purifying filter, 5a Substantially horizontal straight part, 5b Substantially vertical straight part, 5c Curved part, 9 Mouth, 10 Suction port, 11 Indoor unit, 15 Suction area, 16 Wings, 19 Incident angle, 22 Electric dust collector, 23 Stabilizer, 30 Piping.

Claims (1)

In an air conditioner including a cross flow fan, a front upper heat exchanger composed of fin tubes, a front lower heat exchanger and a rear heat exchanger, an air purifying filter, and an electric dust collector ,
Arranging the electric dust collector on the windward side of the front upper heat exchanger;
An intersection of a horizontal line X drawn from the uppermost point A of the front upper heat exchanger and a vertical line Y drawn from the rotation center point O of the crossflow fan is defined as a point B, and a leftmost point C of the air purifying filter. The intersection of the perpendicular line Z drawn from the horizontal line X is D, the intersection of the horizontal line V drawn from the lowest point E of the air conditioner and the perpendicular line Y is F, and the intersection of the perpendicular Z and the horizontal line V And G is a point perpendicular to the front upper heat exchanger and on the crossflow fan side line, and the length of the line passing through the intersection D is DI, and is subtracted from the point I. The angle between the horizontal line W and the length DI of the line segment is θ, and the shortest distance between the cross flow fan and the front heat exchanger is 1.25 to 2.5 times the pipe diameter of the front heat exchanger. When
0.68 ≦ OF / (DG−DIsin θ) ≦ 0.73
The air conditioner is characterized in that the cross flow fan is disposed so as to become .

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