WO2017022024A1

WO2017022024A1 - Indoor unit of air conditioners

Info

Publication number: WO2017022024A1
Application number: PCT/JP2015/071844
Authority: WO
Inventors: 石川　正人; 大石　雅之; 周平横田
Original assignee: 三菱電機株式会社
Priority date: 2015-07-31
Filing date: 2015-07-31
Publication date: 2017-02-09

Abstract

This indoor unit of air conditioners is equipped with: a housing which is formed with a suction port for sucking indoor air into the housing and a blowout port for supplying air-conditioning air to a region to be air-conditioned; a blower fan which is provided within the housing, sucks indoor air through the suction port and blows out air-conditioning air through the blowout port; a heat exchanger which is disposed within the housing in such a manner that the longitudinal axis is situated horizontally in a front view, and performs heat exchange between a refrigerant and indoor air to generate air-conditioning air; and a drain pan which is provided below the lower end of the heat exchanger and recovers dew condensation water. The drain pan is equipped with a wall portion along the longitudinal direction of the heat exchanger, the upper end of the wall portion being provided with a notch portion where the inferior angle is obtuse.

Description

Air conditioner indoor unit

The present invention relates to an indoor unit of a wall-mounted air conditioner installed on the wall surface of an air-conditioning target area, and particularly relates to the shape of a drain pan.

Among indoor units of wall-mounted air conditioners that are installed on the wall surface of an air-conditioning target area, there is an indoor unit that achieves high performance (for example, see Patent Document 1).
The indoor unit described in Patent Document 1 improves the heat exchange efficiency by increasing the air passing through the heat exchanger in the main body, that is, by increasing the heat exchange area, thereby achieving high performance.

During cooling operation, the air passing through the heat exchanger is cooled, and condensed water adheres to the surface of the heat exchanger. The condensed water is collected in a drain pan disposed below the heat exchanger, and then drained to the outside through a drain hose. The drain pan is provided with a wall so that the collected condensed water does not overflow.

JP-A-9-145143

In the drain pan of a conventional air conditioner indoor unit, the wall portion covers the lower end portion of the heat exchanger, and becomes a resistance of air that tries to pass through the lower end portion of the heat exchanger. Therefore, if the lower end of the heat exchanger is positioned above the wall, there is no air resistance to the lower end of the heat exchanger, but a gap is created between the lower end of the heat exchanger and the bottom of the drain pan. Air that does not pass through the exchanger is generated. If it does so, there existed a subject that the cold air heat-exchanged in the fan vicinity mixed with the warm moist air which is not heat-exchanged, and caused condensation.

The present invention has been made to solve the above-described problems, and provides an indoor unit of an air conditioner that can increase the air passing through the lower end of the heat exchanger while suppressing the occurrence of condensation. The purpose is to do.

An indoor unit of an air conditioner according to the present invention includes a housing in which an air inlet for sucking indoor air into the interior and an air outlet for supplying conditioned air to an air-conditioning target area are formed, and the interior of the housing A blower fan that sucks room air from the suction port and blows conditioned air from the blower outlet, and is disposed inside the housing so that the longitudinal direction is the left-right direction when viewed from the front, A heat exchanger that creates conditioned air by exchanging heat with room air; and a drain pan that is provided below a lower end portion of the heat exchanger and collects condensed water. The drain pan includes the heat exchanger. A wall portion is provided along the longitudinal direction, and a notch portion having an obtuse angle on the lower angle side is provided at the upper end portion of the wall portion.

According to the indoor unit for an air conditioner according to the present invention, a notch portion having an obtuse angle on the minor angle side of the notch portion is provided on the wall portion provided along the longitudinal direction of the heat exchanger. Therefore, air passing through the lower end of the heat exchanger can be increased while suppressing the occurrence of condensation.

It is an external appearance perspective view which shows the indoor unit of the air conditioner which concerns on embodiment of this invention. It is a longitudinal section showing the indoor unit of the air harmony machine concerning an embodiment of the invention. It is the perspective view which looked at the drain pan used for the indoor unit of the air conditioner which concerns on embodiment of this invention from the back side. It is the perspective view which looked at the drain pan used for the indoor unit of the air conditioner which concerns on embodiment of this invention from the side surface side. It is a front view which shows typically the drain pan and heat exchanger which are used for the indoor unit of the air conditioner which concerns on embodiment of this invention. It is a front view which shows typically the drain pan and heat exchanger which are used for the indoor unit of the conventional air conditioner. It is a front view which shows typically the drain pan when the housing | casing of the indoor unit of the air conditioner which concerns on embodiment of this invention inclines to the allowable angle left side with respect to the horizontal. It is a front view which shows typically the drain pan when the housing | casing of the indoor unit of the air conditioner which concerns on embodiment of this invention inclines in the permissible angle right side with respect to the horizontal. It is the 1st front view showing typically the drain pan used for the indoor unit of the air harmony machine concerning an embodiment of the invention. It is a 2nd front view which shows typically the drain pan used for the indoor unit of the air conditioner which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.

Embodiment.
FIG. 1 is an external perspective view showing an air conditioner indoor unit 100 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing the air conditioner indoor unit 100 according to an embodiment of the present invention. FIG.
FIG. 2 shows the left side of the drawing as the front side of the indoor unit 100.
Further, in the following description, terms for indicating directions (for example, “up”, “down”, “right”, “left”, “front”, “back”, etc.) are used as appropriate for easy understanding. This is for explanation and these terms do not limit the present invention. In the present embodiment, “up”, “down”, “right”, “left”, “front”, and “rear” are used when the indoor unit 100 is viewed from the front.

Hereinafter, the configuration of the indoor unit 100 will be described with reference to FIGS. 1 and 2.
The indoor unit 100 according to the present embodiment supplies conditioned air to an air-conditioning target area such as a room by using a refrigeration cycle that circulates a refrigerant. In the present embodiment, an example is shown in which the indoor unit 100 is a wall-mounted type that is attached to the wall surface of the air-conditioning target area.

As shown in FIG. 1, the indoor unit 100 includes a rear case 1 that is attached to a wall surface and a housing 6 that is attached to the front surface of the rear case 1. A suction port 12 for sucking into the interior and an outlet 5 for supplying conditioned air to the air-conditioning target area are formed. A front design panel 7 that can be opened and closed is attached to the front surface of the housing 6.

In the housing 6, as shown in FIG. 2, a longitudinal direction is provided in the blower fan 3 that sucks room air from the suction port 12 and blows conditioned air from the blowout port 5, and the air path from the suction port 12 to the blowout port 5 The heat exchanger 2 is disposed so that the direction is the left-right direction, and produces conditioned air by exchanging heat between the refrigerant and room air. And the air flow path is connected in the housing | casing 6 by these components. The housing 6 further includes an electrical component box (not shown) that accommodates a circuit board and the like, and a drain pan 20 that is provided below the lower end of the heat exchanger 2 and collects condensed water from the heat exchanger 2. It is equipped with. The drain pan 20 will be described in detail later.

The suction port 12 is formed in the upper part of the housing 6. The air outlet 5 is formed in the lower part of the housing 6, more specifically, at the lower side of the front surface of the housing 6. The blower fan 3 is disposed on the downstream side of the suction port 12 and on the upstream side of the heat exchanger 2, and is constituted by, for example, an axial fan or a diagonal fan. The heat exchanger 2 is formed in an inverted V shape or Λ shape in the right vertical section, and is disposed on the leeward side of the blower fan 3. For example, a fin tube heat exchanger may be used as the heat exchanger 2. The suction port 12 is provided with a finger guard and a filter (not shown). Furthermore, the blower outlet 5 is provided with an up / down air direction adjusting plate 8 for controlling the blowing direction of the airflow.

The heat exchanger 2 does not have to be strictly an inverted V shape or Λ shape in the right vertical section. Further, the blower fan 3 is not limited to the one disposed on the upstream side of the heat exchanger 2, and may be configured by a cross flow fan or the like disposed on the downstream side of the heat exchanger 2.

Next, the flow of air in the indoor unit 100 will be briefly described.
First, room air flows into the indoor unit 100 from the suction port 12 formed in the upper part of the housing 6 by the blower fan 3. At this time, dust contained in the air is removed by a filter (not shown). This indoor air is heated or cooled by the refrigerant that is conducted through the heat exchanger 2 when passing through the heat exchanger 2 to become conditioned air. The conditioned air is blown out of the indoor unit 100 from the blowout port 5 formed in the lower part of the housing 6, that is, to the air-conditioning target area.

FIG. 3 is a perspective view of drain pan 20 used in indoor unit 100 of the air conditioner according to the embodiment of the present invention as viewed from the back side, and FIG. 4 is an air conditioner according to the embodiment of the present invention. It is the perspective view which looked at the drain pan 20 used for this indoor unit 100 from the side.
Next, the configuration of the drain pan 20 according to the present embodiment will be described.
The drain pan 20 is disposed below the lower end portion of the heat exchanger 2 and collects condensed water adhering to the heat exchanger 2 during the cooling operation of the indoor unit 100, and has the configuration shown in FIGS. ing.

The drain pan 20 includes a front drain pan 20a disposed below the front lower end of the heat exchanger 2 and a rear drain pan 20b disposed below the rear lower end of the heat exchanger 2. The front drain pan 20a and the rear drain pan 20b are provided with a wall portion 21 having a certain height in the front-rear direction and the left-right direction of the upper portion in order to prevent the collected condensed water from overflowing. The upper part is open.

Further, the front drain pan 20a and the rear drain pan 20b are connected to each other in the longitudinal direction, that is, the left and right side portions 20c. And the connection part 22 to which a drain hose (not shown) is connected is each protrudingly provided in the right-and-left side part 20c of the drain pan 20, The drainage for draining dew condensation water in these connection parts 22 Each hole 23 is formed. As described above, the condensed water adhering to the heat exchanger 2 is recovered by the front drain pan 20a and the rear drain pan 20b, and the recovered condensed water is connected to the housing through the drain hole 23 of the connection portion 22 and the drain hose. It is configured to be discharged to the outside of the body 6.

The drain holes 23 are formed in the left and right side portions 20c of the drain pan 20, respectively, in order to be able to determine which drain hole 23 is used according to the environment in which the indoor unit 100 is installed. It is. Then, a drain hose (not shown) is connected to the drain hole 23 that is used, and a cap (not shown) is attached to the drain hole 23 that is not used so that the condensed water does not leak from there. .

In the present embodiment, the front drain pan 20a and the rear drain pan 20b are integrally formed. However, the present invention is not limited thereto, and may be separate from each other.

FIG. 5 is a front view schematically showing the drain pan 20 and the heat exchanger 2 used in the indoor unit 100 of the air conditioner according to the embodiment of the present invention, and FIG. 6 is a diagram of the indoor of the conventional air conditioner. It is a front view showing typically drain pan 30 and heat exchanger 32 used for a machine. In FIGS. 5 and 6, the hidden portion of the heat exchanger as viewed from the front side is indicated by a dotted line.

Hereinafter, the drain pan 20 will be described as having only one of the front drain pan 20a and the rear drain pan 20b, but the contents are the same when both are provided.

As shown in FIG. 5, the wall portion 21 is provided along the left-right direction of the indoor unit 100, that is, along the longitudinal direction of the heat exchanger 2, and the front side (hereinafter referred to as the front wall) of the longitudinal wall portion 21. A cutout portion 24 that is cut into a V shape is provided at the center upper end portion 21au of the central portion 21a). In addition, although mentioned later, the angle 26 of the minor angle side of the notch part 24 provided in the front wall part 21a of the drain pan 20 is an obtuse angle.

Here, the air passage, that is, the wall portion 21 that is orthogonal to the air flow becomes a resistance of the air that tries to pass through the lower end portion of the heat exchanger 2, and as shown in FIG. In addition, if the area covering the lower end portion of the heat exchanger 32 with the wall portion 31 is large, the resistance of air that attempts to pass through the lower end portion of the heat exchanger 32 also increases.

Therefore, in the present embodiment, as shown in FIG. 5, a V-shaped cutout 24 is formed on the upper end 21 au of the front wall 21 a, which is one of the walls 21 orthogonal to the air path, that is, the air flow. Is provided. By doing so, since air passes through the notched portion, the resistance of the air passing through the lower end of the heat exchanger 2 is reduced, and the air passing through the lower end of the heat exchanger 2 is increased. Therefore, the effect that the heat exchange efficiency is improved can be obtained.

Note that the notch 24 may not be strictly V-shaped, such as U-shaped. Moreover, the notch part 24 may be provided in the rear side of the wall part 21 of the longitudinal side orthogonal to the flow of air, and if it is provided in at least one of the front side and the rear side of the wall part 21, it will be described above. The effect of can be obtained.

Here, the indoor unit 100 is usually installed so that the housing 6 is horizontal. The drain pan 20 is provided so that the drain pan 20 is also horizontal when the casing 6 of the indoor unit 100 is installed so as to be horizontal. However, depending on the installation contractor, it may be installed with an inclination of about 0.5 ° with respect to the horizontal so that the drain hole 23 to be used is on the lower side. It may be installed with an inclination so that the drainage hole 23 on the upper side is on the upper side. And since the drain holes 23 are provided not only on one side of the drain pan 20 but also on the left and right sides, there is a high possibility that the direction in which the indoor unit 100 is inclined during installation will be wrong. For this reason, it is necessary to prevent the condensed water from overflowing from the drain pan 20 even when an installation error occurs.

Therefore, the drain pan 20 according to the present embodiment has a structure in which condensed water does not overflow even when the casing 6 of the indoor unit 100 is installed at an allowable angle with respect to the horizontal. Further, the heat exchange efficiency is improved as much as possible. Here, the allowable angle is an angle at which the inclination of the casing 6 of the indoor unit 100 with respect to the horizontal is allowed when the indoor unit 100 is installed, and is determined in a range in which condensed water does not overflow from the drain pan 20.

Normally, when the indoor unit 100 is installed, the allowable angle of the inclination of the housing 6 with respect to the horizontal is about 2 ° at the maximum on the left and right. This is because in a general indoor unit with a lateral width of about 800 mm, the dew condensation water does not overflow from the drain pan, and when it is tilted 2 °, the difference in height between the left and right is about 28 mm. This is because it can be clearly seen that it is inclined.

FIG. 7 is a front view schematically showing the drain pan 20 when the casing 6 of the indoor unit 100 of the air conditioner according to the embodiment of the present invention is installed inclined to the left of the allowable angle with respect to the horizontal. FIG. 8 is a front view schematically showing the drain pan 20 when the casing 6 of the indoor unit 100 of the air conditioner according to the embodiment of the present invention is installed inclined to the right side at an allowable angle with respect to the horizontal. is there. 7 and 8, the drainage holes 23 hidden from the front side are indicated by dotted lines. Further, the shaded portion indicates the condensed water accumulated in the drain pan 20.
Hereinafter, the structure of the drain pan 20 that improves the heat exchange efficiency while preventing the condensed water from overflowing even when the casing 6 of the indoor unit 100 is installed at an allowable angle with respect to the horizontal will be described.

When the casing 6 of the indoor unit 100 is installed to be tilted to the left or right of the allowable angle with respect to the horizontal, that is, in a state where the drain pan 20 is tilted to the left or right of the allowable angle with respect to the horizontal, FIG. 8 and 8, in the vertical direction, the lowest position at the upper end 21au of the front wall 21a, that is, the position where the condensed water overflows from the wall 21 is the upper side of the left and right drain holes 23. The front wall portion 21a is provided so as to be higher than the position of the lower end portion 23l of the drain hole 23, that is, the position where the condensed water is discharged.

By doing in this way, when the housing 6 of the indoor unit 100 is installed tilted to the left of the allowable angle or the right side of the allowable angle with respect to the horizontal, the front wall portion 21a is a position where the dew condensation water overflows from the drain pan 20. Since the lowest position is a position higher than the water surface 25, it is possible to prevent the condensed water from overflowing from the wall portion 21.

In the above, the lower end 23l of the drainage hole 23 on the upper side of the left and right drainage holes 23 is so that the dew condensation water can be used regardless of which drainage hole 23 is used. This is because the lowest position of the front wall portion 21 a that overflows is a position higher than the water surface 25.

FIG. 9 is a first front view schematically showing the drain pan 20 used in the indoor unit 100 of the air conditioner according to the embodiment of the present invention. 9 and 10, the drainage holes 23 hidden from the front side are indicated by dotted lines.
Further, in the state where the drain pan 20 is horizontal, that is, not inclined with respect to the horizontal, the lower end portion 23l of the left drain hole 23, that is, the position where the condensed water is discharged, and the upper end portion of the right side portion 20c. The two-dimensional line connecting the lowest position 20cl, that is, the position where the condensed water overflows (dotted line 27 in FIG. 9), and the lower end portion 23l of the right drain hole 23, that is, the position where the condensed water is discharged. The top portion 24a whose lowest point is the intersection of the lowest position 20cl at the upper end portion of the left side portion 20c, that is, the line (dotted line 28 in FIG. 9) connecting two-dimensionally with the position where the condensed water overflows, Thus, a V-shaped cutout 24 is provided in the front wall 21a.

In addition, in the drain hole 23, when the position in the vertical direction is different between the inside and the outside of the drain pan 20, the position where the condensed water is drained is not the outside of the drain pan 20, but the lower end portion inside.

Here, the upper end portion of the right side portion 20c is the upper end portion of the wall portion 21 located on the short side and located on the right side, and the upper end portion on the right side of the wall portion 21 located on the long side and located on the front side and rear side. Similarly, the upper end portion of the left side portion 20c is the short side and the upper end portion of the wall portion 21 located on the left side, and the long side and the wall portion 21 located on the front side and the rear side. It is the upper end of the left side.

As described above, the intersection point is assumed to be two-dimensional instead of three-dimensional, and the lowest position 20cl at the lower end of the left drain hole 23 and the upper end of the right side 20c, or the right drain hole 23. Even if the lowest position 20cl at the upper end of the left side part 20c is different in the front-rear direction, it is considered that they are at the same position. That is, it is assumed that all of these positions are on the same plane.

Here, as shown by the oblique lines in FIG. 9, the intersection is surrounded by a line connecting the lowest position 20cl at the upper end of the right side 20c and the lowest position 20cl at the upper end of the left side 20c. Even if the drain pan 20 is inclined at an allowable angle, it is a portion that does not become lower than the lower end portion 23l of the drainage hole 23 located on the upper side of the left and right drainage holes 23. It is a range where the condensed water does not overflow, that is, a range where it can be cut out. Therefore, by providing the notch portion 24 in the front wall portion 21a so that the intersection is the top portion 24a, the notch amount can be maximized within a range in which the condensed water does not overflow.

FIG. 10 is a second front view schematically showing the drain pan 20 used in the indoor unit 100 of the air conditioner according to the embodiment of the present invention. In addition, the dotted line shown in FIG. 10 has shown the notch part 24 provided in the upper end part 21au of the front wall part 21a which is hidden seeing from the front side.
As shown in FIG. 10, the angle 26 on the inferior angle side of the cutout portion 24 provided in the front wall portion 21 a of the drain pan 20 is an obtuse angle.

Here, since the notch 24 is provided in the upper end portion 21au of the front wall portion 21a, the height of the front wall portion 21a is lowered depending on the position. Even when tilted, it is necessary to prevent the condensed water from overflowing from the notch 24. Further, if the angle 26 on the inferior angle side of the cutout portion 24 is increased as much as possible, that is, the cutout amount is increased, the air passing through the lower end portion of the heat exchanger 2 can be increased, and the heat exchange efficiency is improved. The effect that can be obtained more.

Therefore, by setting the angle 26 on the minor angle side of the notch 24 to a value obtained by subtracting the left allowable angle and the right allowable angle from 180 °, even when the allowable angle is inclined when the indoor unit 100 is installed, The cutout amount can be increased as much as possible within a range in which the condensed water does not overflow from the cutout portion 24.

When the allowable angle is 2 ° on both the left and right sides, the angle 26 on the minor angle side of the notch 24 is 180 ° −2 ° −2 ° = 176 °.

As mentioned above, according to the drain pan 20 which concerns on this Embodiment, reducing the resistance of the air which passes the lower end part of the heat exchanger 2, suppressing generation | occurrence | production of dew condensation, and passes the lower end part of the heat exchanger 2 Since the amount of air to be increased can be increased, the heat exchange efficiency is improved. Therefore, high performance of the indoor unit 100 can be achieved.

1 rear case, 2 heat exchanger, 3 blower fan, 5 outlet, 6 housing, 7 front design panel, 8 vertical airflow direction adjustment plate, 12 suction port, 20 drain pan, 20a front drain pan, 20b rear drain pan, 20c side Part, 21 wall part, 21a front wall part, 21au upper end part of front wall part, 22 connecting part, 23 drainage hole, 23l lower end part of drainage hole, 24 notch part, 24a top part, 25 water surface, 26 angle, 27 dotted line , 28 dotted line, 30 drain pan, 31 walls, 32 heat exchanger, 100 indoor units.

Claims

A housing formed with an inlet for sucking indoor air into the interior and an outlet for supplying conditioned air to the air-conditioned area;
A blower fan that is provided inside the housing, sucks room air from the suction port, and blows out conditioned air from the blowout port;
A heat exchanger that is arranged inside the housing so that the longitudinal direction is the left-right direction when viewed from the front, and that creates conditioned air by exchanging heat between the refrigerant and room air;
A drain pan that is provided below the lower end of the heat exchanger and collects condensed water; and
The drain pan is
A wall portion is provided along the longitudinal direction of the heat exchanger,
An indoor unit of an air conditioner, wherein an upper end portion of the wall portion is provided with a notch portion whose obtuse angle is an obtuse angle.
The drain pan is formed with a drain hole for draining condensed water,
When the housing is tilted to the left or right side of an allowable angle, which is an angle that allows tilting with respect to the horizontal when installed in front view,
The indoor unit of an air conditioner according to claim 1, wherein the lowest position of the upper end portion of the wall portion where the notch portion is provided is higher than the lower end portion of the drain hole in the vertical direction.
The drain pan has the drainage holes on the left and right sides when viewed from the front,
When the housing is inclined to the left or right side of the allowable angle when viewed from the front,
In the vertical direction, the lowest position of the upper end portion of the wall portion where the cutout portion is provided is a position higher than the lower end portion of the drainage hole on the upper side among the left and right drainage holes. The indoor unit of the air conditioner described in 2.
In the state where the drain pan is horizontal,
A line connecting two-dimensionally the lower end of the drain hole on the left side and the lowest position on the upper side of the right side when the drain pan is viewed in front, and the lower end of the drain hole on the right side when the drain pan is viewed in front 4. The air conditioner according to claim 3, wherein the notch portion is provided so that an intersection of the first portion and a line connecting the lowest position at the upper end of the left side portion in two dimensions is a top portion. Indoor unit.
The air conditioner according to any one of claims 2 to 4, wherein an angle on the minor angle side of the notch is a value obtained by subtracting the allowable angle on the left side and the allowable angle on the right side from 180 °. Indoor unit.
The indoor unit for an air conditioner according to any one of claims 1 to 5, wherein the notch has a V shape.