JP2000088269A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of height of a heat exchanger while securing a heat exchanging area by devising the configuration of the heat exchanger. SOLUTION: An air conditioner is provided with an air suction port 5 positioned at the center of the same and an air outlet port 6 positioned around the air suction port 5, both of them are arranged on the lower surface of the same, a fan 3, guiding air from the air suction port 5 to the air outlet port 6, and a tubular heat exchanger 4, arranged in an air flow passage from the air suction port 5 to the air outlet port 6, while all of them are accommodated in the air conditioner. In this case, the heat exchanger 4 is constituted of a plurality of tubular units, bent at least one place, to permit the reduction of the size of height of the heat exchanger 4 while securing a heat exchanging area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling cassette type air conditioner which is installed at a high place such as a ceiling and blows conditioned air substantially downward.

[0002]

2. Description of the Related Art A conventionally known ceiling cassette type air conditioner has a box-shaped main casing 2 as shown in FIG.
The air conditioner body 1 is provided with a fan 3 and a tubular (for example, cylindrical) heat exchanger 4 disposed therein. A decorative panel 7 having an air inlet 6 and an air outlet 6 is provided at a position surrounding the air inlet 5. Reference numeral 8 is a suction grill, 9 is a fan motor, 10 is a drain pan, 11 is an additional component such as an electric heater, 12 is a horizontal blade, 13 is a heat insulating material,
14 is a ceiling, and 15 is an opening formed in the ceiling 14.

In the air conditioner having the above-described configuration, the room air Wr sucked from the air inlet 5 is converted into heated or cooled conditioned air Wc in the process of passing through the heat exchanger 4, and the air is blown. It is to be blown out from the outlet 6 into the room.

[0004]

In the case of an air conditioner of the ceiling cassette type, the height of the product has a great significance in construction, and it is required to reduce the height. However, as for the height of the drain pan 10 and the thickness of the decorative panel 7, it is necessary to secure a water retention amount and rigidity, and it is difficult to further reduce the thickness.

[0005] In view of this, developments are being made to reduce the height of the product by reducing the height H of the heat exchanger 4.

However, if the height H of the cylindrical heat exchanger 4 is simply reduced as described above, the heat exchange area is reduced, and sufficient heat exchange performance cannot be obtained. In order to secure a heat exchange area, it is conceivable to increase the number of rows in the heat exchanger 4, but a new problem arises that leads to an increase in ventilation resistance.

The present invention has been made in view of the above points, and has as its object to reduce the height of the heat exchanger while securing a heat exchange area by devising the shape of the heat exchanger. Is what you do.

[0008]

According to the first aspect of the present invention, as means for solving the above-mentioned problems, an air inlet 5 located at the center and an air outlet 6 located around the air inlet 5 are provided. A fan 3 for guiding air from the air suction port 5 toward the air outlet 6, and a cylindrical heat source arranged in an air flow path from the air suction port 5 to the air outlet 6. In the air conditioner incorporating the heat exchanger 4, the heat exchanger 4 is constituted by a plurality of cylindrical portions bent at at least one position.

With the above-described configuration, at least one portion of the cylindrical heat exchanger 4 is bent,
The height dimension of the heat exchanger 4 can be reduced while securing a heat exchange area. Therefore, the height dimension of the product can be reduced.

[0010] As in the second aspect of the present invention, the heat exchanger 4 is provided with a first cylindrical portion 18 located downward and inclined inward or in a vertical position, and a first cylindrical portion 18. A second cylindrical portion 19 that is continuous with the upper end of the second cylindrical portion and that slopes outward;
In the case where the third cylindrical portion 20 which is continuous with the upper end of the second cylindrical portion 19 and is inclined downward, the third cylindrical portion 20 is bent at three places, so that the height dimension of the heat exchanger 4 is increased. It can be kept low.

As described in the third aspect of the present invention, the heat exchanger 4 is formed by vertically connecting an inwardly inclined tubular portion 29 that is inclined inward and an outwardly inclined tubular portion 28 that is inclined outwardly. In the case of the configuration, the heat exchanger 4 has a shape bent inward and outward, so that the configuration becomes simpler.

[0012] As in the fourth aspect of the present invention, the heat exchanger 4 is provided with an outwardly inclined cylinder portion 30 which is inclined outwardly, and a downwardly inclined portion which is connected to the upper end of the outwardly inclined cylinder 30 and which is inclined downward. In the case where the heat exchanger 4 is constituted by the cylindrical portion 31, the heat exchanger 4 has a shape bent outward and downward, so that the height can be further reduced with a simple structure.

When the fan 3 is a centrifugal fan in which a centrifugal impeller 16 is located in the primary space 23 of the heat exchanger 4 as in the invention of claim 5, the fan 3 and the heat exchanger 4 Layout becomes easy.

As in the invention of claim 6, the fan 3 is combined with an axial fan or a mixed flow fan in which an axial or mixed flow type impeller 25 is located in the secondary space 24 of the heat exchanger 4. In this case, the air flow passing through the heat exchanger 4 becomes a suction flow, so that it is easy to pass through the entire heat exchanger 4.

As in the invention of claim 7, when an additional component 11 such as an electric heater is disposed in a surplus space S formed adjacent to the bent portion of the heat exchanger 4, the extra space S is formed adjacent to the bent portion. The formed surplus space S can be used effectively.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First Embodiment FIGS. 1 and 2 show an air conditioner according to a first embodiment of the present invention.

This air conditioner is of the ceiling cassette type as described in the section of the prior art.

As shown in FIG. 1, this air conditioner is configured by disposing a fan 3 and a tubular (for example, cylindrical) heat exchanger 4 in a box-shaped main casing 2. A decorative panel having a main body 1, a lower surface of the air conditioner main body 1, a circular air inlet 5 at a central portion, and a ring-shaped air outlet 6 at a position surrounding the air inlet 5. 7 are provided. Reference numeral 8 denotes a suction grill, 9 denotes a fan motor, 10 denotes a drain pan, 12 denotes horizontal blades, 13 denotes a heat insulating material, 14 denotes a ceiling, and 15 denotes an opening formed in the ceiling 14.

The fan 3 is a centrifugal fan (for example, a turbo fan) having a centrifugal impeller 16 connected to a rotation shaft 9a of a fan motor 9 fixed to the center of the top plate 2a of the main casing 2. ). Sign 1
7 is a bellmouth.

The heat exchanger 4 is of a cross fin coil type having fins 34 orthogonal to the heat transfer tubes 33, 33, and includes a first cylindrical portion 18 located below and inclined inward. A second tubular portion 19 which is continuous with the upper end of the first tubular portion 18 and is inclined outward, and the second tubular portion 1
9 and a third cylindrical portion 20 which is continuous with the upper end and which is inclined downward.
And is constituted by. That is, the heat exchanger 4 in the present embodiment is a cylindrical body having a substantially inverted L-shaped cross section bent at two locations. The lower end of the first cylindrical portion 18 is in contact with the drain pan 10, and the lower end of the third cylindrical portion 20 is in contact with the heat insulating material 13 attached to the inner surface of the main casing 2. Are divided into a primary space 23 and a secondary space 24 by the heat exchanger 4.

Further, a part of the primary-side airflow Wr is directed toward the third cylindrical portion 20 at a connecting portion between the second cylindrical portion 19 and the third cylindrical portion 20 in the heat exchanger 4. A donut-shaped airflow distribution plate 21 for guiding is provided. Reference numeral 22 denotes an auxiliary drain pan for receiving drain generated in the third cylindrical portion 20 of the heat exchanger 4.

Further, an additional component 11 such as an electric heater is disposed in a surplus space S formed adjacent to the bent portion in the heat exchanger 4. In this case, the surplus space S formed adjacent to the bent portion can be effectively used.

In the air conditioner configured as described above, the room air (ie, the primary-side airflow) Wr sucked by the fan 3 from the air suction port 5 is heated as indicated by an arrow in FIG. First to third cylindrical portions 18 to 18 in exchanger 4
19, and the conditioned air (ie, the secondary airflow) Wc
As a result, the air is blown out from the air outlet 5 into the room.

In the case of the present embodiment, since the heat exchanger 4 has a bent shape at three points, it is possible to keep the height dimension of the heat exchanger 4 low while securing a sufficient heat exchange area. it can. Moreover, since the heat insulating material 13 is required only in the secondary space 24 of the heat exchanger 4 and is not required in the primary space 23 of the heat exchanger 4, the primary space 23 is not necessary as in the present embodiment. When the casing 2 is expanded to a portion surrounded by the top plate 2a and the upper portion of the side plate, it is not necessary to attach a heat insulating material to the portion, and cost can be reduced.

Second Embodiment FIGS. 3 and 4 show an air conditioner according to a second embodiment of the present invention.

In this case, the fan 3 is an axial fan in which an axial-flow type impeller 25 is located in the secondary space 24 of the heat exchanger 4, and the impeller 25 is It is connected to the rotating shaft 9a of the fan motor 9 fixed to the center of the top plate 2a of the main body casing 2 via a connecting plate 26 extending downward from the secondary space 24 to the primary space 23. It is connected to the rotating plate 27. With such a configuration, the air flow Wr passing through the heat exchanger 4 becomes a suction flow, so that the first flow in the heat exchanger 4
Since it is easy to allow the entire third cylindrical portions 18 to 19 to pass through, the airflow distribution plate in the first embodiment is omitted. The impeller 25 may be of a mixed flow type.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus the description is omitted.

Third Embodiment FIG. 5 shows a main part of an air conditioner according to a third embodiment of the present invention.

In this case, the heat exchanger 4 includes an outwardly inclined tubular portion 28 inclined outwardly, an inwardly inclined tubular portion 29 connected to the upper end of the outwardly inclined tubular portion 28 and inclined inward. It is constituted by. That is, the heat exchanger 4 in the present embodiment is a cylindrical body that is bent at one location and has a substantially inverted cross section. The lower end of the outwardly inclined tubular portion 28 contacts the drain pan 10, the upper end of the inwardly inclined tubular portion 29 contacts the heat insulating material 13 attached to the inner surface of the main casing 2, and the inside of the main casing 2 is The heat exchanger 4 is partitioned into a primary space 23 and a secondary space 24. With such a configuration, the heat exchanger 4 has a shape bent outward and inward, so that the configuration is simpler. In this embodiment, the heat exchanger 4 is constituted by a pair of outwardly and inwardly inclined cylinders 28 and 29. However, a plurality of pairs of inwardly inclined cylinders and outwardly inclined cylinders are provided. May be connected in the vertical direction to form a heat exchanger.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus description thereof is omitted.

Fourth Embodiment FIG. 6 shows a main part of an air conditioner according to a fourth embodiment of the present invention.

In this case, the heat exchanger 4 includes an inwardly inclined tubular portion 29 inclined inward, and an outwardly inclined tubular portion 28 connected to the upper end of the inwardly inclined tubular portion 29 and inclined outward. It is constituted by. That is, the heat exchanger 4 in the present embodiment is a cylindrical body having a substantially U-shaped cross section bent at one place. The inwardly inclined cylinder portion 2
The lower end of 9 is in contact with the drain pan 10, the upper end of the outwardly inclined tubular portion 28 is in contact with the heat insulating material 13 attached to the inner surface of the main casing 2, and the inside of the main casing 2 is It is to be partitioned into a side space 23 and a secondary side space 24.

In this case, since the connecting portion (in other words, the bent portion) between the inwardly inclined tubular portion 29 and the outwardly inclined tubular portion 28 is located inward, the fan 3 has the second configuration. An axial fan having the same configuration as the fan in the embodiment (that is, an axial fan in which an axial-flow type impeller 25 is located in the secondary space 24 of the heat exchanger 4) is employed. With such a configuration, the airflow Wr passing through the heat exchanger 4 becomes a suction flow, so that it is easy to pass through the entire inward and outwardly inclined tubular portions 29 and 28 in the heat exchanger 4.

Further, with this configuration, the heat exchanger 4
Has a shape bent outward and inward, so that the configuration is simpler. In this embodiment, the heat exchanger 4 is constituted by a pair of outwardly and inwardly inclined cylinders 28 and 29. However, a plurality of pairs of inwardly inclined cylinders and outwardly inclined cylinders are provided. May be connected in the vertical direction to form a heat exchanger. The impeller 25 may be of a mixed flow type.

The other configuration and operation and effect are the same as those in the first embodiment, and the description is omitted.

Fifth Embodiment FIG. 7 shows a main part of an air conditioner according to a fifth embodiment of the present invention.

In this case, the heat exchanger 4 is constituted by an outwardly inclined tubular portion 30 inclined outwardly, and a downwardly inclined tubular portion 31 connected to the upper end of the outwardly inclined tube 30 and inclined downward. ing. The outwardly inclined cylinder 30 is considerably shorter than the downwardly inclined cylinder 31. In other words, the heat exchanger 4 in the present embodiment is a cylindrical body having a substantially U-shaped cross section bent at one place. A partition plate 32 is provided between the outwardly inclined tubular portion 30 and the drain pan 10, and a lower end of the downwardly inclined tubular portion 31 is provided on a heat insulating material 1 attached to an inner surface of the main casing 2.
3, the interior of the main body casing 2 is separated from the primary space 23 and the secondary space 2 by the heat exchanger 4 and the partition plate 32.
4 are divided. In this case, since the heat exchanger 4 has a shape bent outward and downward, the height can be further reduced with a simple configuration.

The heat exchanger 4 is formed by laminating cross-fin coil type single units 4a, 4a,... Comprising fins 34 orthogonal to a pair of upper and lower heat transfer tubes 33, 33. With this configuration, the number of layers can be arbitrarily set, and the flow of the air and the flow of the refrigerant can be opposed to each other.

Further, in this case, as the fan 3, an axial flow fan having the same configuration as the fan in the second embodiment (ie, an axial flow type impeller 25 is provided in the secondary space 24 of the heat exchanger 4). Is located in the axial flow fan). With such a configuration, the airflow Wr passing through the heat exchanger 4 becomes a suction flow, so that it is easy to pass through the entire inward and downward inclined tubular portions 30 and 31 in the heat exchanger 4. The impeller 25 may be of a mixed flow type.

The other configuration, operation, and effect are the same as those in the first embodiment, and thus the description is omitted.

Sixth Embodiment FIG. 8 shows a main part of an air conditioner according to a sixth embodiment of the present invention.

In this case, the heat exchanger 4 is composed of an outwardly inclined cylinder portion 30 inclined outwardly, and a downwardly inclined cylinder portion 31 connected to the upper end of the outwardly inclined cylinder 30 and inclined downward. ing. The outwardly inclined cylinder 30 is considerably shorter than the downwardly inclined cylinder 31. In other words, the heat exchanger 4 in the present embodiment is a cylindrical body having a substantially U-shaped cross section bent at one place. A partition plate 32 is provided between the outwardly inclined tubular portion 30 and the drain pan 10, and a lower end of the downwardly inclined tubular portion 31 is provided on the inner surface of the main body casing 2.
3, the inside of the main body casing 2 is separated from the primary space 23 and the secondary space 2 by the heat exchanger 4 and the partition plate 32.
4 are divided. With this configuration, the heat exchanger 4 has a shape bent outward and downward, so that the height can be further reduced with a simple configuration.

The heat exchanger 4 is constructed by laminating a single unit 4a of a cross fin coil type comprising fins 34 orthogonal to a pair of upper and lower heat transfer tubes 33, 33. With this configuration, the number of layers can be arbitrarily set, and the flow of the air and the flow of the refrigerant can be opposed to each other.

Further, in this case, as in the first embodiment, the fan 3 is a centrifugal fan (for example, a turbocharger) having a centrifugal impeller located in the primary space 23 of the heat exchanger 4. Fan).

The other configuration, operation, and effect are the same as those in the first embodiment, and the description is omitted.

In each of the above embodiments, the heat exchanger 4
Is a cylindrical shape, but may be a polygonal tube shape such as a square tube.

In each of the above embodiments, the air outlet 6 is formed in a ring shape. However, the present invention can of course be applied to an air outlet having a circular or rectangular air outlet. is there.

[0049]

According to the first aspect of the present invention, an air inlet 5 located at the center and an air outlet 6 located around the air inlet 5 are provided on the lower surface. In an air conditioner incorporating a fan 3 for guiding air toward an air outlet 6 and a tubular heat exchanger 4 disposed in an air flow path from the air inlet 5 to the air outlet 6, Since the heat exchanger 4 is constituted by a plurality of tubular portions bent at at least one place, the height dimension of the heat exchanger 4 can be kept low while securing a heat exchange area. There is an effect that the height dimension of the product can be kept small while ensuring the capability.

As described in the second aspect of the present invention, the heat exchanger 4 is provided with a first cylindrical portion 18 positioned downward and inclined inward or in a vertical position, and a first cylindrical portion 18. A second cylindrical portion 19 that is continuous with the upper end of the second cylindrical portion and that slopes outward;
In the case where the third cylindrical portion 20 which is continuous with the upper end of the second cylindrical portion 19 and is inclined downward, the third cylindrical portion 20 is bent at three places, so that the height dimension of the heat exchanger 4 is increased. It can be kept low.

As described in the third aspect of the present invention, the heat exchanger 4 is formed by vertically connecting an inwardly inclined tubular portion 29 which is inclined inward and an outwardly inclined tubular portion 28 which is inclined outwardly. In the case of the configuration, the heat exchanger 4 has a shape bent inward and outward, so that the configuration becomes simpler.

As described in the fourth aspect of the present invention, the heat exchanger 4 is provided with an outwardly inclined cylinder portion 30 which is inclined outwardly, and a downwardly inclined portion which is connected to the upper end of the outwardly inclined cylinder 30 and which is inclined downward. In the case where the heat exchanger 4 is constituted by the cylindrical portion 31, the heat exchanger 4 has a shape bent outward and downward, so that the height can be further reduced with a simple structure.

When the fan 3 is a centrifugal fan in which the centrifugal impeller 16 is located in the primary space 23 of the heat exchanger 4 as in the invention of claim 5, the fan 3 and the heat exchanger 4 Layout becomes easy.

As in the invention of claim 6, the fan 3 is combined with an axial fan or a mixed flow fan in which an axial or mixed flow type impeller 25 is located in the secondary space 24 of the heat exchanger 4. In this case, the air flow passing through the heat exchanger 4 becomes a suction flow, so that it is easy to pass through the entire heat exchanger 4.

As in the seventh aspect of the present invention, when an additional component 11 such as an electric heater is disposed in a surplus space S formed adjacent to the bent portion of the heat exchanger 4, the additional space 11 is disposed adjacent to the bent portion. The formed surplus space S can be used effectively.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the air conditioner according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of an air conditioner according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing a main part of an air conditioner according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view showing a main part of an air conditioner according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view showing a main part of an air conditioner according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged sectional view showing a main part of an air conditioner according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a main part of an air conditioner according to a sixth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view of a conventional air conditioner.

[Explanation of symbols]

1 is an air conditioner main body, 2 is a main body casing, 3 is a fan, 4 is a heat exchanger, 5 is an air inlet, 6 is an air outlet,
7 is a decorative panel, 11 is an additional part, 16 is an impeller, 18
Is a first cylinder, 19 is a second cylinder, 20 is a third cylinder,
23 is a primary space, 24 is a secondary space, 25 is an impeller,
28 is an outward cylinder, 29 is an inward cylinder, 30 is an outward cylinder, 31 is a downward cylinder, and S is an excess space.

Claims (7)

[Claims] An air inlet (5) located at the center and an air outlet (6) located around the air inlet (5) are provided on a lower surface, and the air is sucked from the air inlet (5). A fan (3) for guiding air toward the air outlet (6); and a tubular heat exchanger (4) arranged in an air flow path from the air inlet (5) to the air outlet (6). Wherein the heat exchanger (4) is constituted by a plurality of tubular portions bent at least at one location. 2. A heat exchanger (4) comprising: a first cylindrical portion (18) positioned downward and inclined inward or in a vertical posture; and a first cylindrical portion (18). A second tubular portion (19) continuous with the upper end and inclined outward and a third tubular portion (20) continuous with the upper end of the second tubular portion (19) and inclined downward. The air conditioner according to claim 1, wherein: 3. The heat exchanger (4) is formed by vertically connecting an inwardly inclined tubular portion (29) inclined inward and an outwardly inclined tubular portion (28) inclined outwardly. The air conditioner according to claim 1, wherein the air conditioner is configured. 4. An outwardly inclined cylinder portion (30) that inclines the heat exchanger (4) outwardly, and the outwardly inclined cylinder (30).
The air conditioner according to claim 1, characterized in that the air conditioner is constituted by a downwardly inclined tubular portion (31) which is connected to an upper end of the lower end and is inclined downward. 5. The centrifugal impeller (1) is provided in the primary space (23) of the heat exchanger (4).
The air conditioner according to any one of claims 1 to 4, wherein the centrifugal fan in which (6) is located. 6. An axial or mixed flow fan in which an axial or mixed flow type impeller (25) is located in a secondary space (24) of the heat exchanger (4). The air conditioner according to any one of claims 1 to 4, wherein: 7. An additional part (11) such as an electric heater is arranged in a surplus space (S) formed adjacent to a bent portion in the heat exchanger (4). The air conditioner according to any one of claims 1 to 6.