JP2003202119A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize the wind velocity distribution of the whole heat exchanger, aim at reduction of the noise resulting from the maximum wind speed so as to increases an air amount according to an amount of the reduced noise, and improve a heat exchanger performance in the air conditioner. <P>SOLUTION: The air conditioner comprises an oblong crossing flow fan 2; a front side casing 6 having a front side tongue part 6a in the proximity of a lower front part of the crossing flow fan 2; a back side casing 11 having a back side tongue part 11a in the proximity of the back side of the crossing flow fan 2; and a crossing fin tube type heat exchanger 1 having a lower front heat exchanger 1a, an upper front heat exchanger 1b, and a back heat exchanger 1c. The shortest distance L3 from a representative point 8 of a static pressure minimum area 7 of the crossing flow fan 2 to the back heat exchanger 1c and the shortest distance L1 from the representative point 8 to the lower front heat exchanger 1a are rendered substantially equivalent. <P>COPYRIGHT: (C)2003,JPO

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 particularly to an air conditioner in which a heat exchanger is arranged on the suction side of a cross flow fan.

[0002]

2. Description of the Related Art As a conventional air conditioner, as shown in FIG. 6 (Prior art 1), a cross flow fan 2 horizontally arranged in an indoor unit and a front lower part of the cross flow fan 2 are arranged in proximity to each other. A front casing 6 having a front tongue 6a, a rear casing 11 having a rear tongue 11a close to the rear side of the cross flow fan 2, a front lower heat exchanger 1a, a front upper heat exchanger 1b and Some include a back fin heat exchanger 1c and a cross fin tube type heat exchanger 1 arranged on the suction side of the cross flow fan 2. The lower front heat exchanger 1a, the upper front heat exchanger 1b, and the rear heat exchanger 1c have a structure in which they are bent from a linear state. Further, the length of the front lower heat exchanger 1a is equal to or longer than the length of the front upper heat exchanger 1b, and the front upper heat exchanger 1b and the rear heat exchanger 1c face each other in an inverted V shape. Is forming. Further, from the center point O of the cross flow fan 2 to the lower front heat exchanger 1
The minimum distances L1 ′, L2 ′ and L3 ′ to the front heat exchanger 1b and the rear heat exchanger 1c are set to be as small as possible.

Further, as another conventional air conditioner, as shown in Japanese Patent Application Laid-Open No. 2000-161765 (Prior Art 2), the height of the main body is lowered and noise is reduced. A crossflow fan arranged inside the casing and a heat exchanger arranged above and in front of the crossflow fan inside the casing, and exchange heat with the outer edge of the crossflow fan on a horizontal line passing through the center of the crossflow fan. There is a second distance between the outer edge of the cross flow fan and the heat exchanger on a vertical line passing through the center of the cross flow fan, which is shorter than the first distance between the heat exchanger and the heat exchanger.

[0004]

However, in the related art 1, the minimum distance L1 from the center point O of the crossflow fan 2 to the lower front heat exchanger 1a, the upper front heat exchanger 1b, and the rear heat exchanger 1c. Although ', L2', and L3 'are made small to have a compact structure, sufficient consideration has not been given to making the wind velocity distribution of the entire heat exchanger 1 uniform.

That is, in the prior art 1, the front lower heat exchanger 1 starts from the representative point 8 of the static pressure minimum region of the cross flow fan 2.
As shown in FIG. 6, the minimum distance L1 to a is extremely smaller than the minimum distances L2 and L3 from the representative point 8 of the static pressure minimum region to the front upper heat exchanger 1b and the rear heat exchanger 1c. Therefore, the wind speed becomes extremely high in the front lower heat exchanger 1a portion, and on the contrary, the wind speed becomes extremely low in the front upper heat exchanger 1b and the rear heat exchanger 1c. Such a non-uniform wind velocity distribution is not preferable, and the front upper heat exchanger 1b and the rear heat exchanger 1c cannot obtain heat exchange performance corresponding to the heat transfer area, and the front lower heat exchanger 1a.
Was a source of loud noise when air flows through the heat exchanger. Therefore, there is a problem that the heat exchanger 1 as a whole cannot be increased in air volume due to noise restrictions, and the heat exchanger 1 cannot be improved in performance.

On the other hand, in the prior art 2, the outer edge of the crossflow fan and the heat exchanger are more than the first distance on the horizontal line between the outer edge of the crossflow fan and the heat exchanger with reference to the center of the crossflow fan. It has only been shown that the second distance on the vertical line between and is shortened, and sufficient consideration has not been given to making the wind velocity distribution of the entire crossflow fan 2 uniform.

That is, in the prior art 2, in order to prevent the Karman vortex streets generated downstream of the front heat exchanger from interfering with the blades due to the rotation of the crossflow fan, only the distance required for the rectification of the Karman vortices is used. The front heat exchanger is separated from the cross flow fan. Therefore, the prior art 2 has a function of suppressing local noise generation, and is not for improving the wind speed distribution of the entire heat exchanger to achieve high performance.

The object of the present invention is to make the wind velocity distribution of the entire heat exchanger uniform, and to reduce the noise caused by the maximum wind velocity, and to improve the heat exchanger performance by increasing the air volume as much as the noise can be reduced. It is to provide an air conditioner that can be achieved.

The present invention is not limited to such an object, and objects and advantages other than the above will be apparent from the following description.

[0010]

The air conditioner of the present invention for achieving the above object comprises a crossflow fan horizontally arranged in an indoor unit, and a front side close to a lower front side of the crossflow fan. A front casing having a tongue portion, a rear casing having a rear tongue portion adjacent to the rear side of the cross flow fan, a front lower heat exchanger, a front upper heat exchanger and a rear heat exchanger. In an air conditioner equipped with a cross fin tube type heat exchanger arranged on the suction side of the cross flow fan,
The minimum distance from the representative point of the static pressure minimum area of the cross-flow fan to the back heat exchanger and the minimum distance from the representative point of the static pressure minimum area to the front lower heat exchanger are substantially equal. It is in.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of embodiments of the air conditioner of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings of the respective embodiments and the related art 1 indicate the same or equivalent components.

First, an air conditioner according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a vertical sectional view of an indoor unit in an air conditioner of a first embodiment of the present invention.

The indoor unit 20 is formed in a horizontally long box shape, and is connected to an outdoor unit (not shown) via a refrigerant pipe or electric wiring to form an air conditioner.

At the center of the indoor unit 20, a horizontally long cylindrical cross flow fan 2 is arranged. The cross flow fan 2 is rotated by a fan motor (not shown). A front side casing 6 and a rear side casing 11 are installed in front of and behind the cross flow fan 2,
Roughly speaking, the front side and the upper side of the cross flow fan 2 are the suction side, and the lower side is the blow side.

The front-side casing 6 has a front-side tongue portion 6a formed in a portion close to the lower front portion of the crossflow fan 2. A front surface dew receiving portion and a front surface dew receiving portion 6b are integrally formed on the front surface side casing 6 in front of the front surface tongue portion 6a.

The back side casing 11 has a back side tongue portion 11a formed in a portion close to the back side of the cross flow fan 2. A back side dew receiving portion 11b is formed integrally with the back side casing 11. Further, the rear surface side casing 11 has a blowing portion that extends downward from the rear of the cross flow fan 2 and a suction portion that extends upward from the rear surface side dew receiving portion 11b.

Front casing 6 and rear casing 1
The outlet 4 formed between the outlet 1 and
A horizontal wind direction plate and a vertical wind direction plate are rotatably installed. The outlet 4 is formed in the bottom of the indoor unit 20 on the front side.

The indoor unit 20 has a suction opening formed on the front surface and the upper surface by the suction grill 3 and the like. Horizontal X passing through the center O of the cross flow fan 2
The suction grille 3 and the outlet 4 at the lower part of the front face are provided within the range of the third quadrant B among the four quadrants divided by the axis and the vertical Y-axis. An air filter (not shown) is detachably arranged along the suction side of the heat exchanger 1 inside the suction port of the indoor unit 20.

On the suction side of the cross flow fan 2,
A cross fin tube type heat exchanger 1 is arranged.
The heat exchanger 1 constitutes a part of a refrigeration cycle together with a compressor, an outdoor heat exchanger, a pressure reducing device, and the like. The heat exchanger 1 includes front heat exchangers 1a and 1b located on the front side in the indoor unit 20, and back heat exchanger 1c located on the back side.
It consists of and.

The lower front heat exchanger 1a is arranged substantially vertically in front of the cross flow fan 2, and the upper front heat exchanger 1b is arranged.
Are arranged so as to obliquely incline toward the upper front of the cross flow fan 2 and extend high. Front lower heat exchanger 1a
The lower end portion of is located inside the front surface dew receiving portion 6b. In addition,
Although the lower front heat exchanger 17 and the upper front heat exchanger 18 are formed to have a bent structure in this embodiment, they may be formed by combining them separately, or they may be formed continuously in an arc shape. It may be integrally formed.

The rear heat exchanger 1c is formed so as to incline upward and rearward of the cross flow fan 2 and extend low. The lower end of the rear heat exchanger 1c is the rear dew receiving portion 1
Located within 1b. And the front upper heat exchanger 1b
The back heat exchanger 1c forms an inverted V shape, and the inclination angles θ1 and θ2 with respect to the respective perpendiculars are set to angles at which condensed water can flow down.

The reason why the heat exchanger 1 is generally large so as to enclose the cross flow fan 2 is to reduce the power consumption of the air conditioner by increasing the heat transfer area and the ventilation area. That is, in order to reduce the power consumption of the air conditioner, it is necessary to reduce the compression power by the compressor and the blowing power by the cross flow fan 2, and by increasing the heat transfer area of the heat exchanger 1, heat exchange is performed. The heat exchange amount of the heat exchanger 1 is increased, the refrigeration cycle performance is improved, the compression power of the compressor can be reduced, and the ventilation area of the heat exchanger 1 is increased to reduce the ventilation resistance. Blower power can be reduced.

Next, the flow of air in the indoor unit 20 will be described.

When the cross flow fan 2 is rotated, the air around the indoor unit 20 is sucked from the upper and front suction grilles 3, passes between the heat exchanging fins of the heat exchanger 1, and exchanges heat with the refrigerant. Then, it is sucked into the cross flow fan 2. Then, the air blown out from the cross flow fan 2 is blown out into the room from the blowout port 4. At this time, with a line segment 60 connecting the minimum gap position between the front side tongue portion 6a and the cross flow fan 2 and the minimum gap position between the back side tongue portion 6b and the cross flow fan 2 as a boundary,
The upper part of the cross flow fan 2 is the suction side, and the lower part is the blowing side.

Due to the characteristics of the cross flow fan 2, the region near the front side tongue portion 6a is the region 7 having the lowest static pressure (minimum static pressure region) 7. The ambient air has a minimum static pressure area 7
The flow line 5 of the air flowing in the indoor unit 20 is as shown in FIG. The air stream lines 5 do not intersect with each other.

Then, the minimum distance L3 from the representative point 8 of the static pressure minimum region 7 of the cross flow fan 2 to the rear heat exchanger 1c, the minimum distance L1 from the representative point 8 to the lower front heat exchanger 1a, and the representative The minimum distance L2 from the point 8 to the front upper heat exchanger 1b is almost equal. The range defined as substantially equal distances in these minimum distances L1, L2, L3 is within the thickness of the front heat exchangers 1a, 1b in the ventilation direction, or 2 of the outer diameter of the cross flow fan 2.
Within 0%. Within this range, it is possible to obtain the effect of uniformizing the wind velocity distribution of the heat exchanger 1 described later.

The range for designating the minimum static pressure area 7 is as follows. Below the line segment 60 connecting the minimum gap position between the front side tongue 6a and the cross flow fan 2 and the minimum gap position between the back side tongue 6b and the cross flow fan 2, and outside the cross flow fan 2. The region of the third quadrant enclosed inside the diameter is specified as the static pressure minimum region 7. Then, by setting the representative point 8 of the minimum static pressure area 7 as the center of gravity of the area, it can be approximated to the representative point of the actual minimum static pressure area. Thereby, the indoor unit 20 in the present invention can be easily designed.

As described above, by making the minimum distances L1 and L3 approximately equal, the high wind speed of the front lower heat exchanger 1a is appropriately suppressed, and the wind speed of the rear heat exchanger 1c increases.
The wind speed distribution of the entire heat exchanger 1 can be made uniform, and the performance of the air conditioner can be improved. Further, since the noise caused by the maximum wind speed of the heat exchanger 1 can be reduced, the air volume can be increased for the same noise, and the performance of the air conditioner can be further improved.

In addition to making the minimum distances L1 and L3 substantially equal, and making the minimum distance L2 substantially equal to these, the wind speed of the front upper heat exchanger 1b increases, and the heat exchanger 1 as a whole. The wind speed distribution can be made more uniform, and the performance of the air conditioner can be further improved.

Furthermore, in addition to making the minimum distances L1, L2, and L3 approximately equal, the length of the front lower heat exchanger 1a is set to be half the length of the front upper heat exchanger 1b or less, and Front upper heat exchanger 1b formed to face each other in a V shape
And inclination angles θ1 and θ with respect to the vertical line of the back heat exchanger 1c
Since 2 is an angle at which condensed water can flow down, for uniform heat flow distribution of the heat exchanger 1 and for heat exchange of the front upper heat exchanger 1b and the rear heat exchanger 1c under conditions such as cooling operation. It is possible to prevent water droplets condensed on the surfaces of the fins from falling onto the cross flow fan 2.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a vertical cross-sectional view of the indoor unit of the air conditioner of the second embodiment of the present invention. The second embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

In this second embodiment, one heat exchanger 1 is formed on a concentric circle centered on the representative point 8 of the static pressure minimum region 7. Specifically, the heat exchanger 1 includes arc-shaped heat exchange fins having outer and inner diameters of an outer diameter circle 1d and an inner diameter circle 1e. Further, the lower front heat exchanger 1a and the upper front heat exchanger 1b are continuously formed as shown by a phantom line 1f, and there is a gap between the upper front heat exchanger 1b and the rear heat exchanger 1c. A notch 1g is formed. Furthermore, the back side tongue part 11a is formed in the front end part of the back side dew receiving part 11b.

By using the heat exchanger 1 as described above, each part of the heat exchanger 1 can be arranged at an equal distance from the representative point 8 of the static pressure minimum region 7, so that the wind speed of the entire heat exchanger 1 can be increased. Uniform distribution is maximized.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a vertical sectional view of an indoor unit of an air conditioner according to a third embodiment of the present invention. The third embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

In the third embodiment, the front lower heat exchanger 1
a and the front upper heat exchanger 1b are continuously formed as shown by an imaginary line 1f to form one front heat exchanger 1h. The front heat exchanger 1h is formed to be curved, and is arranged so as to enclose the cross flow fan 2.

According to the third embodiment, as compared with the first embodiment, the number of parts can be reduced and the leakage flow between the front lower heat exchanger 1a and the front upper heat exchanger 1b can be suppressed. This has the effect of shortening the points and the depth dimension of the indoor unit 20.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a vertical sectional view of an indoor unit of an air conditioner according to a fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment as described below and is basically the same as the first embodiment in other points.

In the fourth embodiment, the front lower heat exchanger 1
The a is slanted so that the lower end is rearward.
With this configuration, the lower front heat exchanger 1a
Also, in the case of manufacturing the front heat exchanger by bending the front upper heat exchanger 1b, it can be brought closer to the ideal heat exchanger 1 centered on the representative point 8 of the static pressure minimum region 7.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a vertical cross-sectional view of the indoor unit of the air conditioner of the fifth embodiment of the present invention. The fifth embodiment is different from the first embodiment as described below, and is basically the same as the first embodiment in other points.

In the fifth embodiment, the front upper heat exchanger 1b and the rear heat exchanger 1c are integrally formed in the first embodiment to form a bending structure by cutting, whereas the front upper heat exchanger 1b is formed. And the rear heat exchanger 1c are configured as separate bodies. With such a configuration, the effect of the present invention can be easily obtained even when the cross flow fan 2 having a large fan diameter and having a great effect on noise countermeasures is mounted.

[0041]

According to the present invention, the wind speed distribution of the entire heat exchanger can be made uniform, and the noise caused by the maximum wind speed can be reduced, and at the same time, the amount of air can be increased to reduce the noise to improve the heat exchanger performance. An air conditioner that can be improved is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an indoor unit of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an indoor unit of an air conditioner according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an indoor unit of an air conditioner according to a third embodiment of the present invention.

FIG. 4 is a sectional view of an indoor unit of an air conditioner of a fourth embodiment of the present invention.

FIG. 5 is a sectional view of an indoor unit of an air conditioner according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of an indoor unit of a conventional air conditioner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 1a ... Lower front heat exchanger, 1b ... Front upper heat exchanger, 1c ... Rear heat exchanger, 1h ... Front heat exchanger, 2 ... Cross flow fan, 3 ... Suction grill, 4
... Blowout port, 5 ... Air streamline, 6 ... Front casing, 6a ... Front tongue, 6b ... Front dew receiving portion, 7 ... Minimum static pressure area, 8 ... Representative point of minimum static pressure area, 11 ... back side casing, 11a ... back side tongue, 11b ... back side dew receiving part, 20 ... indoor unit, 60 ... line segment connecting tongues.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hakke Shinsuke             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Mitsuo Kudo             502 Kintatemachi, Tsuchiura City, Ibaraki Japan             Tate Seisakusho Mechanical Research Center (72) Inventor Atsushi Otsuka             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Tochigi Technology Co., Ltd. F term (reference) 3L049 BB05 BB07 BC01 BD02                 3L050 BA01 BA05 BA10                 3L051 BE05 BE07

Claims (6)

[Claims] 1. A cross-flow fan horizontally arranged in an indoor unit, a front-side casing having a front-side tongue portion near a lower front side of the cross-flow fan, and a rear-side portion of the cross-flow fan. A rear casing having a rear tongue, a cross fin tube type heat exchanger having a front lower heat exchanger, a front upper heat exchanger and a rear heat exchanger arranged on the suction side of the cross flow fan. In the air conditioner equipped with, the minimum distance from the representative point of the static pressure minimum area of the cross flow fan to the back heat exchanger, and the minimum distance from the representative point of the static pressure minimum area to the front lower heat exchanger. An air conditioner characterized by making the distances almost equal. 2. The minimum distance from the representative point of the static pressure minimum region to the back heat exchanger, and the minimum distance from the representative point of the static pressure minimum region to the front lower heat exchanger according to claim 1. Is within 20% of the outer diameter of the cross flow fan. 3. The minimum distance from the representative point of the static pressure minimum region to the back heat exchanger, and the minimum distance from the representative point of the static pressure minimum region to the front lower heat exchanger according to claim 1. An air conditioner characterized in that the minimum distance from the representative point of the static pressure minimum region to the front upper heat exchanger is substantially equal. 4. The air conditioner according to claim 1, wherein the front lower heat exchanger, the front upper heat exchanger, and the rear heat exchanger heat exchange fins are continuously formed. 5. A cross flow fan horizontally arranged in the indoor unit, a front side casing having a front side tongue portion in the vicinity of a front lower portion of the cross flow fan, and a rear side of the cross flow fan. A rear casing having a rear tongue, a cross fin tube type heat exchanger having a front lower heat exchanger, a front upper heat exchanger and a rear heat exchanger arranged on the suction side of the cross flow fan. The front lower heat exchanger, the front upper heat exchanger and the rear heat exchanger are air conditioners formed by bending or independent heat exchange fins, wherein the length of the front lower heat exchanger is The size is less than half the length of the front upper heat exchanger, the minimum distance from the representative point of the static pressure minimum region of the cross flow fan to the rear heat exchanger, and the static The minimum distance from the representative point of the minimum area to the front lower heat exchanger and the minimum distance from the representative point of the static pressure minimum area to the front upper heat exchanger are substantially equal, and the front upper heat exchanger and The air conditioner is characterized in that the rear heat exchangers are formed to face each other in an inverted V shape and the respective inclination angles are set to angles at which condensed water can flow down. 6. A cross flow fan horizontally arranged in an indoor unit, a front side casing having a front side tongue portion near a lower front side of the cross flow fan, and a rear side of the cross flow fan. A rear casing having a rear tongue, a cross fin tube type heat exchanger having a front lower heat exchanger, a front upper heat exchanger and a rear heat exchanger arranged on the suction side of the cross flow fan. In the air conditioner including, the back surface heat from the center of gravity of the area of the cross flow fan surrounded by a line segment from the front side tongue to the back side casing and a perpendicular line passing through the center of the cross flow fan. An air conditioner characterized in that the minimum distance to the exchanger and the minimum distance from the center of gravity to the front lower heat exchanger are substantially equal.