JP2002081672A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the problem with prior art that a room air conditioner using a reflux fan as a fan for an indoor machine can be improved in performance of a heat exchanger by converting the air volume to a high level, but a noise level is raised in accordance with such a high air volume. SOLUTION: A reflux fan 7 is adapted such that air sucked from openings 1, 2 in the front surface and in the upper surface of an indoor machine is diffused from a nozzle at a lower portion of the indoor machine through heat exchangers 3, 4, 5. The reflux fan 7 is provided on a downstream side from the heat exchangers 3, 4, 5. An angle is set over 180 degree at the heater exchanger side in the vertical section, at the intersection of the line between the extremity of the front nose 8 and the center of the shaft of the reflux fan 7 and the line between the rear nose 7 and the center of the fan shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a room air conditioner and a package air conditioner, and relates to a cross-flow fan (cross-flow fan, cross-flow fan) used for an indoor unit.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for power saving in air conditioners. In order to save power, it is important to improve the performance of compressors, electrical appliances, and heat exchangers, and to increase the airflow of the unit as long as comfort is maintained. However, high air volume
This is one of the main factors for increasing the noise of the unit, and it is desired that the fan realize low air noise and high air volume.

[0003] As a conventional technique disclosed for realizing low noise, there is Japanese Utility Model Publication No. 7-49292. In the above-described conventional technology, a rib that receives dew water from a rear heat exchanger and also serves as a rear tongue of a blower is integrally formed to suppress noise increase and maximize the performance of the heat exchanger. . It is stated that the ribs can receive dew without disturbing the air flowing into the blower, thereby eliminating a noise increase factor.

[0004] Another prior art is USP5211219. In the above prior art, a dew receiving portion formed integrally with the unit on the back portion of the unit is provided at the upper portion of the fan to receive dew water of the heat exchanger on the back of the unit inside the bent heat exchanger, and under the fan, It is described that a back nose is formed.

[0005]

However, in the above-mentioned prior art, there is a problem that an increase in the amount of air blown from the once-through fan increases the noise level.

[0006] It is an object of the present invention to provide an air conditioner which realizes a high air flow without increasing the noise level.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an indoor unit having openings at the front and top surfaces thereof, and to discharge air taken in from these openings through a heat exchanger through an outlet formed at a lower portion of the indoor unit. In an air conditioner having a cross-flow fan that winds on the leeward side of the heat exchanger, a horizontal line in a longitudinal cross section of the indoor unit when the indoor unit that passes through the axial center of the cross-flow fan is installed; This is achieved by setting the angle between the axis of the fan and the straight line connecting the rear nose to be at least 0 degree and less than 60 degrees.

Another object of the present invention is to provide a once-through fan which has openings at the front and top surfaces of an indoor unit, and exhausts air taken in from these openings through a heat exchanger through an outlet formed at a lower portion of the indoor unit. In the air conditioner provided on the leeward side of the heat exchanger, in the longitudinal section of the indoor unit, a straight line connecting the front nose tip and the axial center of the once-through fan,
This is achieved by making the angle between the back nose and the straight line connecting the axial center of the once-through fan on the heat exchanger side 180 degrees or more.

Another object of the present invention is to provide a cross-flow fan which has openings on the front and top surfaces of an indoor unit and exhausts air taken in from these openings through a heat exchanger through an outlet formed below the indoor unit. In the air conditioner provided on the leeward side of the heat exchanger, in the longitudinal section of the indoor unit, a front nose tip and an axial center of the once-through fan are connected by a straight line, and a rear nose and an axial center of the once-through fan are connected. Are connected by straight lines, and the air suction side angle formed by these straight lines is made larger than the air outlet side angle formed by these straight lines.

It is another object of the present invention to provide a cover having openings on the front and top surfaces, a once-through fan, and a heat exchanger having an inverted V-shape in a vertical section of the indoor unit, which is disposed between the cover and the once-through fan. A front heat exchanger and a rear heat exchanger arranged so as to form an air outlet provided at a lower portion of the indoor unit, and a front nose and a rear nose arranged at positions sandwiching the once-through fan. In the air conditioner, a backside dew receiving groove provided in a lower region of the backside heat exchanger is provided, and the lower end of the backside heat exchanger is disposed so as to be lower than an upper end of the once-through fan, This is achieved by placing the back nose below the groove.

[0011]

FIG. 1 shows an embodiment of the present invention. The figure is a longitudinal sectional view of an indoor unit of a room air conditioner. Intake from the openings provided in the upper grill 1 and the front grill 2 of the indoor unit (the opening may be provided from the upper grill to the front grill, or there may be no opening between the upper grill and the front grill) The air
Pre-filter 12, partially air-cleaning filter 1 for air cleaning
3 through the lower heat exchanger 5,
Front upper heat exchanger 4 (these are called front heat exchangers),
And flows into the rear heat exchanger 3 via the subcooler 6. This flow of air is caused by the rotation of a once-through fan impeller 7 in which the suction channel and the blow channel are separated by the front nose 8 and the rear nose 17 by a motor (not shown).

Above the rear nose 17, a rear dew receiving rib 15 for receiving dew from the rear heat exchanger 3 of the indoor unit.
And a rear exposure groove 16 formed by the unit rear wall 14. A rear casing 9 is provided downstream of the rear nose 17 on the side of the blow-out channel, and air exchanged with the heat exchanger flows through the rear casing 9 and the front nose 8.
The air is exhausted from the outlet flow path constituted by

The back nose 17, which separates the suction flow path and the discharge flow path of the once-through fan 7 and has a significant effect on noise or air volume, is located below the above-mentioned exposure groove 16 and has an optimum shape. The rear dew receiving ribs 15 on the rear of the indoor unit are exclusively used to prevent dripping from the unit rear heat exchanger 3, and are arranged and shaped so as to minimize the action as a rear nose. Back nose 17
Is mounted at a position of an angle θ between a shaft center and a line passing through the shaft center and horizontal to the indoor unit. Further, the lower end of the backside heat exchanger 3 is disposed at a position lower than the upper end of the once-through fan 7. That is, the front heat exchangers 4 and 5 and the rear heat exchanger 3 are arranged so as to cover the once-through fan 7.

FIG. 2 shows a comparison of the amount of air that can be produced at the same noise when the angle θ is changed. Figure
In the embodiment shown in FIG. 1, it can be seen that there is an optimum value near θ = 16 degrees. By the way, the standard is that the conventional θ is 6
The air volume at 0 degree is used as a reference. Θ is 1
The reason why the air volume that can be output at the same noise under the condition of 5 degrees or less decreases because low-frequency heterogeneous sound is generated below this level. It is thought that if the problem of the low frequency sound can be solved, the air volume can be further increased. From this, as the unit structure shown in the present embodiment, θ is 0
If it is not less than 60 degrees and less than 60 degrees, the air volume at the time of the same noise increases. In particular, if θ is not less than 0 degree and not more than 45 degrees,
It is possible to increase the air volume by 1% or more.

The reason for lowering the position of the rear nose 17 to increase the air volume at the time of the same noise as described above is considered as follows. The rear nose 17 is the beginning of the spiral vortex, and the heat exchanger side is on the suction side of the once-through fan and the wind direction plates 10 and 11 are on the rear side.
The side is the outlet side. Referring to FIG. 6, the heat exchanger side is closer to the suction side than the straight line connecting the axial center of the once-through fan and the tip of front nose 8, the straight line connecting the axial center of the once-through fan and rear nose 17, and the wind direction plate is closer to these. The 10 and 11 sides are the blowing sides.

Now, in FIG. 6, a convex rear nose 1 is shown.
7, the case where the start of the spiral of the rear casing 9 is the tip of the rear dew receiving rib 15, that is, the case where θ is 60 degrees or more is assumed. The air flow passing through the upper grill 1 and flowing through the rear heat exchanger 3 passes through the vicinity of the tip of the rear dew receiving rib 15 and enters the once-through fan. The air exits from the cross-flow fan from slightly below the intersection on the rear side of the air flow, and is exhausted to the outside of the indoor unit. This airflow is the airflow that flows most on the rear side inside the indoor unit. Under this condition, the space formed by the intersection between the rear casing 9 and a line passing through the axis from the rear nose (the end of the rear dew receiving rib 15) and the horizontal plane of the unit, and the airflow flowing most rearward of the indoor unit. The air is
Since it does not ride on this air flow, it stays in this space (dead water area in the blow-out flow path of the once-through fan downstream from the rear dew receiving rib 15 for preventing dripping from the rear heat exchanger 3). However, a vortex is generated in this space because the fan is rotating. It is considered that this vortex flows downward near the outer diameter of the fan, rises on the wall surface of the rear casing 9, turns back near the rear exposure receiving rib 15, and flows downward. It is believed that the once-through fan consumes power to generate the vortex, and that the vortex generates noise.

In the present embodiment, as described above, the position of the rear nose 17 is lowered below the exposure groove 16 so that
θ is reduced. By doing so, the rear nose 1
The space between the rear casing 9 and the airflow flowing closest to the rear casing 9 flowing near the vicinity 7 is reduced, and the above-mentioned vortex is reduced. In other words, the suction-side opening on the heat exchanger side becomes wider than the straight line connecting the axial center of the once-through fan and the tip of the front nose 8, and the straight line connecting the axial center of the once-through fan and the rear nose 17, It is thought that the vortex shrinks as much as it spreads. As shown in FIG. 6, an angle (a heat exchanger side) between a straight line connecting the axial center of the once-through fan and the tip of the front nose 8 and a straight line connecting the axial center of the once-through fan and the rear nose 17, that is, The angle α of the suction side opening is 1
The angle was made larger than 80 degrees (the angle was made larger than the angle of the opening on the outlet side). Thereby, the above-mentioned vortex is reduced, the air volume can be increased without changing the noise, and the air volume can be increased without increasing the electric input.

In the present embodiment, the rear nose 17 is a lower region of the rear heat exchanger 3 and is lower than a rear dew receiving groove 16 formed by a rear dew receiving rib 15 for receiving dew and a unit rear surface 14. The curved surface of the casing has a shape that is partially convex (or has two or more inflection points on the curved surface of the casing) with respect to the outer diameter curved surface of the blower.

Incidentally, since the back heat exchanger 3 and the back dew receiving rib 15 shown in FIG.
Air did not flow under the rear heat exchanger 3 because the rear dew receiving ribs 15 obstructed the air. Therefore, as shown in FIG. 3, the uppermost end of the rear dew receiving rib 15 is set to be lower than the lowermost end of the rear heat exchanger 3. By adopting this structure, air flows to the vicinity of the lowermost end of the rear heat exchanger 3 to increase the amount of heat exchange,
Since a sufficient suction passage for the fan is ensured, a high air volume can be realized with low noise. The rear dew receiving rib 15 is located at a position lower than the lowermost end of the rear heat exchanger 3 in the figure. A position that is not very close to the heat exchanger pipe closest to the lowermost end (a position lower than the pipe and a position where the fin between the lowermost end and the lowermost pipe of the backside heat exchanger 3 can effectively exchange heat) may be used. .

In the case where dripping from the rear heat exchanger 3 becomes a problem, the lower end of the rear dew receiving groove 16 is enlarged even if a structure in which dew easily flows is adopted in the lower part of the rear heat exchanger 3. Alternatively, the gradient of the rear dew receiving groove 16 in the unit width direction may be increased so that the back dew receiving groove 16 may be deflected in the unit width direction.
It may overlap with the rear nose 17 of the unit.

By the way, in the structure shown in FIG. 3, the lower the dew receiving ribs 15 on the back, the dew easily falls.
Therefore, as shown in FIG. 4, the rear dew receiving rib 15 is located below the lowermost end of the rear heat exchanger 3,
Further, in-groove ribs 18 were provided in 6. By providing the ribs 18 in the groove, air (raw gas) that does not pass through the heat exchanger at the lowermost end of the backside heat exchanger 3 can be suppressed from flowing into the fan, and a portion where dew accumulates in the dew receiving groove 16 can be suppressed. Is separated into two, it is possible to solve a problem that the dew easily falls, which is a problem of lowering the rear dew receiving rib 15.

FIG. 5 shows another embodiment of the present invention. The basic configuration of the unit is the same as in the above embodiment. The difference is that a rear nose 17 is provided on the fan side of the rear exposure rib 15. With this configuration, the rear dew receiving rib 15 serves exclusively to prevent the dew from dripping, and the rear nose 17 has an effect that an optimal shape for increasing the air flow and reducing noise of the cross-flow fan can be obtained. In addition, if the structure is a combination of the two, the shape of the rear nose 17 may not be optimally shaped, and if both are optimally structured,
The thickness of this portion is increased, and there is a danger of unit deformation due to sink during molding cooling.

According to the embodiment described variously,
There is an effect that a comfortable space can be created by reducing the noise of the indoor unit of the room air conditioner, and a high air volume can be realized with the same noise. The effect is about 1 in COP conversion
%. Also, there is an effect that deformation due to sink of the material at the time of unit molding can be suppressed.

[0024]

As described above, according to the present invention, it is possible to realize a high air flow without increasing the noise level.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating one embodiment of the present invention.

FIG. 2 is a view for explaining effects according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view illustrating another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view illustrating another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view illustrating another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view illustrating one embodiment of the present invention.

[Explanation of symbols]

1… Top grill, 2… Front grill, 3… Rear heat exchanger, 4…
Front upper heat exchanger, 5 Front lower heat exchanger, 6 Subcooler, 7 Cross-flow fan impeller, 8 Front nose, 9 Rear casing, 10 Vertical plate, 11 Horizontal plate, 12 Filters, 13… Clean filter, 14… Unit back wall, 15… Rear back receiving rib, 16… Rear back receiving groove, 17… Back nose, 18
... Rib in groove.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazutoshi Ota 800, Tomita, Odai-cho, Ohira-cho, Shimotsuga-gun, Tochigi In-house Hitachi Tochigi Technology Co., Ltd. F-term (reference) in Hitachi Tochigi Technology 3L049 BA03 BB02 BC01 BC03 BD02 3L051 BE04

Claims (4)

[Claims] 1. A through-flow fan which has openings on the front and top surfaces of an indoor unit and exhausts air taken in from these openings through a blower formed at a lower portion of the indoor unit via a heat exchanger. In the air conditioner provided on the leeward side of the vessel,
In a longitudinal section of the indoor unit, an angle between a horizontal line passing through the axial center of the once-through fan when the indoor unit is installed and a straight line connecting the axial center of the once-through fan and the rear nose is 0 degree or more and 60 degrees. Air conditioner with less than. 2. A through-flow fan which has openings at the front and top surfaces of the indoor unit and discharges air taken in from these openings through an outlet formed at a lower portion of the indoor unit via a heat exchanger. In the air conditioner provided on the leeward side of the vessel,
In the longitudinal section of the indoor unit, an angle between the straight line connecting the front end of the front nose and the axial center of the once-through fan and the straight line connecting the rear nose and the axial center of the once-through fan on the heat exchanger side is 180 degrees. The air conditioner as above. 3. A through-flow fan which has openings at the front and top surfaces of the indoor unit and discharges air taken in from these openings through a blower formed at a lower portion of the indoor unit via a heat exchanger. In the air conditioner provided on the leeward side of the vessel,
In the longitudinal section of the indoor unit, the front end of the front nose and the axial center of the once-through fan are connected with a straight line, the rear nose and the axial center of the once-through fan are connected with a straight line, and the air suction side angle formed by these straight lines is determined. An air conditioner having a larger angle than the air outlet side formed by these straight lines. 4. A cover having openings on the front and upper surfaces, a once-through fan, and a cover disposed between the cover and the once-through fan such that the heat exchanger in the vertical section of the indoor unit has an inverted V-shape. An air conditioner including a front heat exchanger and a rear heat exchanger arranged, an air outlet provided at a lower part of the indoor unit, and a front nose and a rear nose arranged at positions sandwiching the once-through fan. In the above, further comprising a back dew receiving groove provided in a lower region of the back heat exchanger, disposed so that the lower end of the back heat exchanger is lower than the upper end of the cross-flow fan, below the back dew receiving groove An air conditioner in which the rear nose is disposed.