WO2014097437A1

WO2014097437A1 - Indoor unit for air conditioning device

Info

Publication number: WO2014097437A1
Application number: PCT/JP2012/083022
Authority: WO
Inventors: 松本　崇; 健一迫田; 山中　宗弘; 堤　博司; 一也道上
Original assignee: 三菱電機株式会社
Priority date: 2012-12-20
Filing date: 2012-12-20
Publication date: 2014-06-26

Abstract

An indoor unit for an air conditioning device comprises: a body which has an air flow passage through which air flows; an axial flow blower which is provided within the body; a heat exchanger which is provided within the body at a position upstream or downstream of the axial flow blower; and a drain pan which is provided within the body at a position downstream of the heat exchanger. A sloped surface is provided at a portion of the bottom surface of the air flow passage of the body, the portion being located upstream of the heat exchanger, and the sloped surface causes the height of the portion of the bottom surface to increase from upstream to downstream of the air flow passage.

Description

Air conditioner indoor unit

The present invention relates to an indoor unit of an air conditioner.

The indoor unit of the air conditioner has a main body on which a blower, a heat exchanger, and the like are mounted, and the blower is disposed upstream of the heat exchanger, and an air flow is blown to the heat exchanger, or heat is downstream of the blower. Various proposals have been made in which an exchanger is arranged and an air flow is supplied. In such an indoor unit of an air conditioner, heat exchange is performed between the air taken into the main body and the refrigerant, and the air is cooled or heated. And the air which performed heat exchange is supplied from the blower outlet of a main body to air-conditioning object space, such as a room | chamber interior.

Various types such as a once-through type, an axial flow type, a diagonal flow type, and a centrifugal type are adopted for the blower mounted on the indoor unit of such an air conditioner. For example, in the case of a multi-blade centrifugal blower used in a general air conditioner, it has an air guide path that guides a suction airflow of a fan having a plurality of blades, and a casing that guides a fan blowout flow. Is installed on the bottom surface of the main body on the upstream side of the heat exchanger so as to be horizontal.

Here, since the indoor unit of an air conditioner is installed in a building, its main body is required to be small. In particular, in a ceiling-suspended indoor unit, the casing is stored and installed behind the ceiling of the falling ceiling, so the height of the main body must be small and the width in the direction parallel to the air flow direction of the main body must be small. It has been.

A conventional air conditioner indoor unit has a cross-flow blower, and has been proposed to reduce the height width of the main body and reduce the width of the main body in the direction parallel to the air flow direction (for example, Patent Document 1).
In addition, in the indoor unit of the conventional air conditioner, the heat exchanger is arranged in a V shape, so that the height of the main body is reduced and the width in the direction parallel to the air flow direction of the main body is reduced. Some have been proposed (see, for example, Patent Documents 1 and 2).

JP 2007-292405 A (see, for example, FIG. 1) Japanese Patent Laid-Open No. 3-156221 (see, for example, FIGS. 18 and 19)

According to the technique described in Patent Document 1, since the blade tip of the once-through fan is close to the heat exchanger, the dominant frequency noise that is an integral multiple of the value obtained by multiplying the number of blades Z of the fan by the rotation speed n is generated. There was a problem.
Moreover, since the technique of patent document 1 employ | adopted the once-through fan, the nonuniform flow to a heat exchanger generate | occur | produced and the subject that heat exchange performance might fall occurred.

As in the technologies described in

Patent Documents

1 and 2, when an indoor unit is configured by arranging a heat exchanger downstream of a multi-blade centrifugal blower or a cross-flow blower, the air with a steep blowout velocity distribution is heat exchanged. Therefore, there is a problem that an increase in air turbulence, an increase in pressure loss, and an increase in noise in the downstream air passage are caused due to the flow in the downstream air passage provided with the vessel.

This invention solves said subject and provides the indoor unit of the air conditioning apparatus which implement | achieves suppressing the turbulence of the air of a wind path, reducing the pressure loss of a wind path, and suppression of noise generation. The purpose is that.

An indoor unit of an air conditioner according to the present invention is provided in a main body having an air passage through which air flows, an axial blower provided in the main body, and an upstream or downstream side of the axial blower in the main body. A heat exchanger and a drain pan provided in the main body and below the heat exchanger, and the upstream side of the heat exchanger on the bottom surface of the air passage of the main body is downstream from the upstream side of the air passage. The inclined surface is provided so as to increase in height toward the side.

According to the indoor unit of the air conditioner according to the present invention, since it has the above-described configuration, it is possible to suppress the turbulence of air in the air passage, reduce the pressure loss of the air passage, and suppress the generation of noise.

It is a perspective view of the indoor unit of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is a perspective view of the state which decomposed | disassembled the indoor unit shown in FIG. It is a cross-sectional perspective view of the indoor unit shown in FIG. It is a center sectional view of the indoor unit shown in FIG. It is a vector diagram of the air flow in the vicinity of the suction port. It is explanatory drawing of the relationship between the inclination angle of the inclined surface of a drain pan, and the length of a drain pan. It is explanatory drawing of the relationship between the inclination angle of the inclined surface of a drain pan, and a pressure loss. It is explanatory drawing of the relationship between the distance from an axial blower, and a wake turbulence amount. It is a center sectional view of the indoor unit of the air harmony device concerning Embodiment 2 of the present invention. It is a center sectional view of the indoor unit of the air-conditioning apparatus according to Embodiment 3 of the present invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described with reference to the drawings. It should be noted that the drawings described below are schematic and ratios of dimensions and the like are different from actual ones. Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

1 is a perspective view of an air-conditioning apparatus according to Embodiment 1. FIG. FIG. 2 is a perspective view of the indoor unit shown in FIG. 1 in an exploded state. 3 is a cross-sectional perspective view of the indoor unit shown in FIG. 4 is a central cross-sectional view of the indoor unit shown in FIG. In addition, A shown in FIG. 4 represents the flow direction of air. The configuration of the indoor unit of the air conditioner will be described with reference to FIGS.
The indoor unit of the air-conditioning apparatus according to Embodiment 1 includes a main body 1 having an air passage through which air flows, two axial flow fans 2 that supply air, and a heat exchanger 3 that exchanges heat between the air and the refrigerant. And a drain pan 4 for storing the dew condensation water of the heat exchanger 3.
The indoor unit according to Embodiment 1 is suspended from a ceiling so that a body bottom 1b (described later) is parallel to the building floor, and a decorative ceiling (not shown) is provided below the body bottom 1b. . A blow grill is provided on the surface formed by the ceiling and the ceiling, and the indoor unit according to the first embodiment can suck airflow from an opening provided in the ceiling.

(Main unit 1)
The main body 1 constitutes the outline of the indoor unit, and is equipped with an axial blower 2, a heat exchanger 3, and a drain pan 4. The main body 1 includes a main body upper portion 1a provided on the upper side of the heat exchanger 3, a main body bottom portion 1b provided on the opposite side of the main body upper portion 1a, and a main body upper portion 1a and a main body bottom portion 1b. The main body side surface 1c is provided so as to be substantially orthogonal.
The main body 1 is formed with a suction port 1A for taking air into the main body 1 on the front side of the paper surface in FIGS. Moreover, the blower outlet 1B is formed in the main body 1 on the opposite side to the formation position of the suction inlet 1A. Thus, the main body 1 is a member having a main body upper portion 1a, a main body bottom portion 1b, and a main body side surface 1c, in which a suction port 1A and a blower outlet 1B are formed, and a cross-sectional shape perpendicular to the air flow direction is a substantially square member. is there.

The main body upper portion 1 a is provided with a heat insulating member 5 that comes into contact with the upper side of the heat exchanger 3. The heat insulating member 5 is provided so that heat of the heat exchanger 3 or the like escapes to the main body upper part 1a side and the heat exchange efficiency of the heat exchanger 3 is not reduced. The heat insulating member 5 is provided so as to extend in the air flow direction, and the upstream end portion side of the heat insulating member 5 is inclined downward from the upstream side to the downstream side of the heat insulating member 5. Has a taper. Since the heat insulating member 5 has this taper, it is possible to suppress the turbulence of the air blown out toward the main body upper portion 1a by the axial blower 2 and flowing along the main body upper portion 1a.

The main body bottom 1b is provided with the axial blower 2 on the upstream side and the drain pan 4 on the downstream side. The air blown to the main body bottom 1b side by the axial blower 2 and flows along the main body bottom 1b is sent to the drain pan 4 side.
The main body side surface 1c has an upper end connected to the upper main body 1a and a lower end connected to the main body bottom 1b. The main body side surface 1c also constitutes an air passage in the main body 1 like the main body upper portion 1a and the main body bottom portion 1b.

The main body 1 is provided with a suction partition plate 7 on which an axial blower 2 is installed on the suction port 1A side. The suction partition plate 7 is formed with a circular opening 7 A at the installation position of the axial flow fan 2. The suction partition plate 7 is erected on the main body 1 so as to be orthogonal to the main body upper portion 1a, the main body bottom portion 1b, and the main body side surface 1c.

(Axial flow fan 2)
The axial blower 2 takes air into the main body 1 and discharges air outside the main body 1. The axial blower 2 is installed at the position where the opening 7 A of the suction partition plate 7 is formed, and is provided upstream of the heat exchanger 3 and the drain pan 4.
The axial blower 2 has a rotating fan 2a, a motor 2b for rotating the fan 2a, a bell mouth 2c provided on the radially outer side of the fan 2a, and a motor stay 2d for holding the motor 2b. ing. The motor 2b is held by a motor stay 2d so that the opening center axis of the bell mouth 2c coincides with the rotation center axis of the motor 2b. The boss portion of the fan 2a is connected to the rotation center axis of the motor 2b.

In the axial blower 2, the blowout / suction flow has a large flow velocity on the fan outer peripheral side. More specifically, the air flow is faster on the outer peripheral side than on the central axis side of the axial blower 2, and the air blown from the axial blower 2 is directed toward the fan rotation direction of the axial blower 2. That is, it becomes a blowing airflow having a swirl velocity component. Most of the blown airflow is blown to the upstream end side of the drain pan 4 on the downstream side.
In the present embodiment, two axial flow fans 2 are provided so as to be aligned in the horizontal direction, but the present invention is not limited to this. For example, the axial blower 2 may be provided so that three or more are arranged in the horizontal direction, or may be one.
Moreover, in this Embodiment, although the axial-flow fan 2 demonstrated the example arrange | positioned in the upstream of the heat exchanger 3 and the drain pan 4, it is not limited to this, The heat exchanger 3 and the drain pan 4 You may install in the downstream.

(Heat exchanger 3)
The heat exchanger 3 exchanges heat between the air taken into the main body 1 by the axial blower 2 and the supplied refrigerant. As shown in FIGS. 3 and 4, the heat exchanger 3 has a substantially V shape in which the longitudinal cross-sectional shape protrudes toward the suction port 1 A. That is, the heat exchanger 3 is arranged so that the apex side of the V-shaped protruding portion is on the suction port 1A side.

The heat exchanger 3 may be configured by combining, for example, a fin plate type two-row heat exchanger and a three-row heat exchanger. That is, the heat exchanger 3 includes an upper main heat exchanger 3 a disposed at a position facing the heat insulating member 5 and a lower main heat exchanger 3 b disposed at a position facing the drain pan 4. . An upper auxiliary heat exchanger 3aa is provided on the downstream side surface of the upper main heat exchanger 3a, and a lower auxiliary heat exchanger 3bb is provided on the downstream side surface of the lower main heat exchanger 3b. The amount of heat exchange is increased.

In the heat exchanger 3, the upstream end side of the upper main heat exchanger 3a and the upstream end side of the lower main heat exchanger 3b are in contact with each other. When the heat exchanger 3 is mounted on the main body 1 so that the contact portion is on the extension of the rotation shaft of the axial blower 2, the turbulence of air can be further suppressed. For example, the upper main heat exchanger 3a may have a smaller number of stages than the lower main heat exchanger 3b so that the contact portion is on the extension of the rotation shaft of the axial blower 2.

The upper main heat exchanger 3a and the lower main heat exchanger 3b are cut at the joints of the respective heat exchangers. That is, as shown in FIG. 3 and FIG. 4, the end side on the upstream side in the air flow direction of the upper main heat exchanger 3 a and the end side on the upstream side in the air flow direction of the lower main heat exchanger 3 b are as shown in FIGS. It is formed to be tapered. Accordingly, the V-shaped angle formed by the upper main heat exchanger 3a and the lower main heat exchanger 3b can be made gentle, and the size of the main body 1 can be reduced, so that the size can be reduced. Become.

(Drain pan 4)
The drain pan 4 stores the condensed water of the heat exchanger 3. The drain pan 4 may be configured such that the area of the drain pan 4 is larger than the projected area of the heat exchanger 3 when the heat exchanger 3 is projected onto the drain pan 4 from the upper surface side of the main body 1. The downstream side portion of the drain pan 4 is in contact with the downstream end side of the lower main heat exchanger 3b, so that leakage of airflow and condensed water can be prevented.

The upstream surface portion of the drain pan 4 is formed with an inclined surface 4A so as to become higher from the upstream side of the air passage in the main body 1 toward the downstream side. If the angle θ formed between the inclined surface 4A and the main body bottom 1b is, for example, not less than 30 degrees and not more than 60 degrees, turbulence of the air blown from the axial blower 2 can be suppressed with high efficiency. The angle of the inclined surface 4A will be described in detail with reference to FIGS.

In the first embodiment, the inclined surface 4A is described as being formed on the drain pan 4, but the present invention is not limited to this. For example, the inclined surface 4 A may be formed of a member different from the drain pan 4. That is, even if the drain pan 4 is not formed with a portion of the inclined surface 4A, a member having an inclined surface such as the inclined surface 4A is placed at the position of the inclined surface 4A shown in FIG. It may be arranged.

In the first embodiment, the case where the inclined surface 4A is linearly inclined has been described as an example. However, the present invention is not limited to this and may be a curved surface. When the inclined surface 4A is a curved surface, for example, it is formed so as to protrude upward, and its radius of curvature is 10% or more of the diameter of the fan 2a. Can do.

[Description of operation]
When the air conditioner is operated, by applying electric power to the motor 2b, the fan 2a rotates counterclockwise, and the airflow in the room is sucked from the suction port 1A of the main body 1 into the opening surface of the bell mouth 2c. Thereby, air is supplied to the heat exchanger 3 in the main body 1.
Refrigerant is supplied to the heat exchanger 3 from an outdoor unit (not shown), and heat exchange is performed between the air taken into the main body 1 and the refrigerant, so that the air taken into the main body 1 is exchanged. Cooled or heated. The air that has undergone heat exchange is blown into the room from the air outlet 1B of the main body 1 so that air conditioning in the room can be achieved.

In the cooling operation of the air conditioner, indoor high-humidity air passes through the heat exchanger 3 having a low temperature, so that moisture in the air is condensed on the surface of the heat exchanger 3 to generate dew condensation water. The generated condensed water flows down according to gravity and is stored in the drain pan 4 installed in the main body bottom 1b.

In the first embodiment, the heat exchanger 3 is described as being supplied with a refrigerant. However, the present invention is not limited to this, and water or an antifreeze containing water as a main component is supplied. May be. When such a water-based refrigerant is used, an increase in cost can be suppressed as compared with the case of using it for another solvent.

[Explanation of air flow]
FIG. 5 is a vector diagram of the air flow in the vicinity of the suction port 1A. In addition, A shown in FIG. 5 represents the flow direction of air. The suppression of air turbulence will be described with reference to FIG.
As shown in FIG. 5, the air blown out from the axial blower 2 spreads radially outward of the fan 2a, then flows along the main body bottom 1b and the inclined surface 4A, and then flows into the heat exchanger 3. To do. As shown in FIG. 5, it can be seen that the flow is smooth on the inclined surface 4 A of the drain pan 4.
Since the drain pan 4 has a concave shape having a predetermined depth so that condensed water can be stored, the upstream portion of the drain pan 4 collides with air, and air turbulence is likely to occur. . In addition, the air passage at the position where the drain pan 4 is installed has a locally narrowed air passage cross-sectional area corresponding to the installation of the drain pan 4, causing pressure loss and abnormal noise. However, in the indoor unit according to the first embodiment, since the drain pan 4 has the inclined surface 4A, it is possible to suppress the occurrence of air turbulence, reduce the pressure loss, and suppress the generation of abnormal noise. It is like that.

[An angle of the inclined surface 4A]
FIG. 6 is an explanatory diagram of the relationship between the inclination angle of the inclined surface 4 A of the drain pan 4 and the length of the drain pan 4. FIG. 7 is an explanatory diagram of the relationship between the inclination angle of the inclined surface 4A of the drain pan 4 and the pressure loss. FIG. 8 is an explanatory diagram of the relationship between the distance from the axial blower 2 and the wake turbulence amount.
As shown in FIG. 6, when the inclination angle of the inclined surface 4A is reduced, the length of the drain pan 4 in the direction parallel to the air flow direction is increased accordingly, and the main body 1 is increased in size. Also, as shown in FIG. 7, if the tilt angle is less than 70 degrees, the pressure loss is less than half that of 90 degrees. Furthermore, as shown in FIG. 8, it can be seen that if the inclination angle is less than 60 degrees, the influence of turbulence in the wake of the fan 2a can be reduced to less than 10%.

Here, in the region B shown in FIG. 6, since the drain pan 4 has a distance of 0.5 times or more the fan diameter, the length dimension of the main body 1 in the direction parallel to the air flow direction is the axial flow. This is a region where the main body 1 becomes larger because the fan 2 becomes the same size.
On the other hand, in the area D shown in FIG. 6, the turbulence of the wake of the fan 2a affects the upstream end of the drain pan 4, and the pressure loss in the air passage increases and the noise increases. This area is known from analysis and experiments.
From these, the angle of the inclined surface 4A is in the range of 30 degrees or more and 60 degrees or less in the region C in order to achieve both the miniaturization of the main body 1 and the suppression of air turbulence, the reduction of pressure loss, and the reduction of noise. It turns out that it is good.

[Effect of indoor unit of air-conditioning apparatus according to Embodiment 1]
Since the indoor unit of the air conditioner according to the first embodiment has the inclined surface 4A of a predetermined angle, “the size reduction of the main body 1” and “the air flow caused by the upstream end of the drain pan 4” It is possible to achieve both suppression of turbulence, reduction of pressure loss in the air passage, and suppression of noise generation due to interference between the drain pan 4 and the fan 2a.

Embodiment 2. FIG.
FIG. 9 is a central sectional view of the indoor unit of the air-conditioning apparatus according to Embodiment 2. In addition, A shown in FIG. 9 represents the flow direction of air. In the second embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment are denoted by the same reference numerals.

In the first embodiment, the vertical cross-sectional shape of the heat exchanger 3 is substantially V-shaped so as to protrude toward the suction port 1A. That is, in Embodiment 1, the upper main heat exchanger 3a and the lower main heat exchanger 3b are arranged in the heat exchanger 3 so that the apex side of the V-shaped protruding portion is on the suction port 1A side. (See FIG. 3 and FIG. 4).
In the indoor unit of the air-conditioning apparatus according to Embodiment 2, the heat exchanger 3 has a substantially V shape that protrudes toward the outlet 1B. That is, in the second embodiment, the upper main heat exchanger 3a and the lower main heat exchanger 3b are arranged in the heat exchanger 3 so that the apex side of the V-shaped protruding portion is on the outlet 1B side. . The upper auxiliary heat exchanger 3aa is installed on the upstream side surface of the upper main heat exchanger 3a, and the lower auxiliary heat exchanger 3bb is installed on the upstream side surface of the lower main heat exchanger 3b.

[Effect of indoor unit of air-conditioning apparatus according to Embodiment 2]
The indoor unit of the air conditioning apparatus according to Embodiment 2 has the same effects as the indoor unit of the air conditioning apparatus according to Embodiment 1.

Embodiment 3 FIG.
FIG. 10 is a central cross-sectional view of the indoor unit of the air-conditioning apparatus according to Embodiment 3. In addition, A shown in FIG. 10 represents the flow direction of air. In the third embodiment, the differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments are denoted by the same reference numerals.

In the first and second embodiments, the axial flow fan 2 is installed on the main body bottom 1b so that the rotation center axis of the axial flow fan 2 is parallel to the main body bottom 1b.
In Embodiment 3, the axial flow fan 2 is installed on the main body bottom 1b so that the rotation center axis of the axial flow fan 2 forms a predetermined angle larger than 0 degrees with respect to the main body bottom 1b. That is, the fan 2a, the motor 2b, the bell mouth 2c, and the motor stay 2d are installed at a predetermined angle.

In the third embodiment, the heat exchanger 3 is in contact with the upstream end portion of the upper main heat exchanger 3a and the upstream end portion of the lower main heat exchanger 3b. The heat exchanger 3 is mounted on the main body 1 so that the contact portion is on the extension of the rotating shaft of the axial blower 2. Thereby, turbulence of the air supplied to the heat exchanger 3 can be further suppressed.

[Effects of the indoor unit of the air-conditioning apparatus according to Embodiment 3]
The indoor unit of the air conditioner according to Embodiment 3 has the same effects as the indoor unit of the air conditioner according to

Embodiments

1 and 2.

1 body, 1a body top, 1b body bottom, 1A inlet, 1B outlet, 2 axial fan, 2a fan, 2b motor, 2c bell mouth, 2d motor stay, 3 heat exchanger, 3a upper main heat exchanger, 3aa Upper auxiliary heat exchanger, 3b Lower main heat exchanger, 3bb Lower auxiliary heat exchanger, 4 Drain pan, 4A inclined surface, 5 Thermal insulation member, 7 Suction partition plate, 7A opening.

Claims

A main body having an air passage through which air flows;
An axial blower provided in the main body,
A heat exchanger provided in the main body and upstream or downstream of the axial blower;
A drain pan provided in the main body and below the heat exchanger;
Have
The upstream side of the heat exchanger on the bottom surface of the air passage of the main body is
An indoor unit of an air conditioner, wherein an inclined surface is provided so as to increase in height from the upstream side to the downstream side of the air passage.
The inclined surface is
It consists of a separate member from the drain pan,
The indoor unit of the air conditioner according to claim 1, wherein the indoor unit is provided on an upstream side of the drain pan of the air passage of the main body.
The inclined surface is
The indoor unit of the air conditioner according to claim 1, wherein the indoor unit is configured by a part of an upstream side of the drain pan.
The inclined surface is
The indoor unit for an air conditioner according to any one of claims 1 to 3, wherein an angle formed with the bottom surface of the main body is 30 degrees or more and 60 degrees or less.
The inclined surface is
The indoor unit of an air conditioner according to any one of claims 1 to 3, wherein the indoor unit is formed of a curved surface having a radius of curvature of 10% or more of a fan diameter of the axial blower.
The heat exchanger is
A lower main heat exchanger provided to face the drain pan;
An upper main heat exchanger provided on the upper side of the lower main heat exchanger;
Consisting of at least
The lower main heat exchanger and the upper main heat exchanger are:
One end side of the lower main heat exchanger and one of the upper mains so that the longitudinal cross-sectional shape of the heat exchanger has a substantially V shape protruding upstream or downstream of the air passage. The indoor unit for an air conditioner according to any one of claims 1 to 5, wherein the indoor unit is arranged so that the end side comes into contact therewith.
The heat exchanger is
The air according to claim 6, wherein a contact portion between the lower main heat exchanger and the upper main heat exchanger is provided so as to be substantially extended from a rotation shaft of the axial blower. The indoor unit of the harmony device.
The lower main heat exchanger and the upper main heat exchanger are:
One end side of the lower main heat exchanger and one end side of the upper main heat exchanger are provided in contact with each other,
The indoor unit of the air conditioner according to claim 6 or 7, wherein the contact portion is formed in a tapered shape.