JPH1144431A - Fan coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat exchange efficiency by arranging a plurality of rotary mechanisms in which a centrifugal supply fan is mounted on a rotary shaft in a vertical direction to eliminate the supplied air from being blown against a heat exchanger with its locally and remarkably high speed, to increase the air supply, and to unify the air speed distribution. SOLUTION: Two motors equipped with a centrifugal supply fan 12 on each end part of a rotary shaft are arranged in the vertical direction within a box- shaped casing 11 of a fan coil unit 10, and a heat exchanger 15 is installed forward thereof. When air is supplied from an air discharge port of a plurality of centrifugal supply fans 12, the air speed is unified at the distance relatively close to the air discharge port 18 to suppress generation of the vortex and the reverse flow. The air out of the air discharge port 18 is uniformly passed through the whole surface of the heat exchanger 15 to greatly improve the heat exchange efficiency. Because the air speed distribution is unified at the distance relatively close to the air discharge port 18, the distance from the air discharge port 18 to the heat exchanger 15 can be set to be small, and the equipment can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan coil unit constituting a blower in an air conditioner of various buildings.

[0002]

2. Description of the Related Art A fan coil unit which is embedded in a ceiling portion of a building as an apparatus constituting air conditioning equipment in various buildings has a structure as shown in FIGS. in use. The fan coil unit 70 includes a motor 71 having a centrifugal blower fan 72 mounted on both ends of a rotating shaft 73 in a casing 71 having a predetermined shape.
A heat exchanger 75 and the like are arranged.

[0003] Here, the centrifugal fan has a structure in which a plurality of blades are arranged around a rotation shaft, and has a function of blowing gas such as air through the rotation of the blades in a radial direction. That is.

On the other hand, in recent years, the air-conditioning capacity of conventional air-conditioning equipment has been often insufficient due to an increase in the size of a building or an increase in room temperature accompanying an increase in indoor equipment such as FA equipment and OA equipment. Therefore, the demand for improving the air conditioning capacity is increasing.

[0005] In order to respond to such demands, research and development have been conducted to enhance the blowing capacity of the fan coil unit.
Measures such as increasing the output of the electric motor 74 and increasing the size of the centrifugal fan 72 are taken. Further, as shown in FIG. 10, the electric motor 74 of the conventional fan coil unit 70 is used.
A method of arranging a plurality of blowing fans 72 in parallel is also employed.

[0006]

In the conventional fan coil unit 70, when the output of the electric motor 74 is increased and the size of the centrifugal fan 72 is increased, the blowing capacity is increased. There is a problem that noise increases.

That is, the source of noise in the fan coil unit is mainly the wind noise of the centrifugal fan 72. However, when the size of the centrifugal fan 72 is increased, the diameter of the fan increases and the peripheral speed of the outer peripheral portion increases. Because of the increase, the wind noise increases significantly.

The conventional fan coil unit 70
In the case of, as shown in FIG. 11, when the wind speed distribution in a virtual plane 77 which is 75 mm away from the fan mounting plate 76 that divides the internal space of the casing 71 into the suction side and the discharge side to the leeward side, a large variation occurs. You can see that
That is, the wind speed is large at a short distance in front of the air discharge port 78 of the centrifugal blower fan 72, but the wind speed decreases as the distance from the air discharge port 78 increases, and a vortex occurs near the lower end of the plane 77 to cause a backflow. I have.

As described above, in the case of the conventional fan coil unit 70, there is a large variation in the wind speed distribution at the air discharge port 78, and the air flow is uniformly distributed to the heat exchanger 75 installed in front of the air discharge port 78. However, there is a problem that heat exchange efficiency is low because the heat is not applied. This tendency becomes more conspicuous as the distance from the air discharge port 78 to the heat exchanger 75 is shorter. Therefore, when the centrifugal blower fan 72 is increased in size for improving the air conditioning performance, in order to ensure high heat exchange efficiency,
It is necessary to increase the distance from the air discharge port 78 to the heat exchanger 75, which also causes an increase in the size of the device.

In order to increase the size of the electric motor and the blower fan in order to improve the blowing capacity, the thickness of the components such as the casing 71 and the fan mounting plate 76 must be increased in order to increase the strength of the structure supporting these. It is necessary to increase the size of the fan coil unit 70, and the weight of the entire fan coil unit 70 increases significantly. In addition, a fixing member and the like are required for a large motor and a large blower fan.

In addition, the conventional fan coil unit 7
At 0, the air flow rate is adjusted by controlling the rotation speed of the electric motor 74. In this case, taps of several stages are taken out of the coil of the electric motor 74, and the rotation speed is changed by tap switching. Therefore, the structure of the electric motor 74 is complicated, and a lot of time and labor is required in the manufacturing process, which is a major factor in increasing the cost.

On the other hand, in order to improve the air-conditioning capacity, instead of increasing the size of the electric motor and the blower fan, if a plurality of electric motors and blower fans of the fan coil unit are to be installed in parallel, there is no large space above the ceiling. Can not do it. Further, as shown in FIG. 10, it is necessary to install a guide member 79 for collecting air blown from a wide air blowing port in the lateral direction, which leads to an increase in size and complexity of the entire apparatus.

An object of the present invention is to provide a fan coil unit having a compact size, low noise, and excellent heat exchange efficiency.

[0014]

In order to solve the above-mentioned problems, a fan coil unit according to the present invention is characterized in that a plurality of rotary drives having a centrifugal blower fan mounted on a rotary shaft are vertically arranged. By adopting such a structure, a plurality of centrifugal blowers are arranged in the vertical direction, so that the heat exchanger does not hit the heat exchanger with a remarkably high speed locally. The heat exchange efficiency can be improved without being uniform and without increasing the size of the apparatus. In addition, an increase in wind noise of the centrifugal fan does not occur.

In this case, a structure in which a centrifugal fan is attached to one end of the rotating shaft of the rotary driving machine may be used. However, by using a structure in which centrifugal fans are attached to both ends of the rotating shaft, one unit is provided. Since a plurality of centrifugal blowing fans can be operated by the rotary drive, the blowing capacity is improved. Also,
By blowing air with a plurality of centrifugal fans, the wind speed distribution when air is blown toward the same plane can be made more uniform than when air is blown from a single centrifugal fan.

Further, the fan coil unit of the present invention can have a structure that can change the blowing direction of the centrifugal blowing fan. With such a structure, concentration of the blowing direction can be avoided, so that the blowing direction of the centrifugal blowing fan can be adjusted so that the wind speed distribution when blowing toward the same plane becomes uniform. Become like

Further, in the fan coil unit of the present invention, the centrifugal blowers mounted on the plurality of rotary drives have a structure in which the rotary drives are arranged so that the blowing directions are the same and the rotational directions are opposite to each other. be able to. Usually, since the air discharge port of the centrifugal fan is located at a position deviated to the side of the rotating shaft, a plurality of centrifugal fans are arranged so that the rotation directions of the centrifugal fan are opposite to each other. Since the air discharge ports of the blower fan can be arranged close to each other in the vertical direction, the size of the device can be reduced. On the other hand, on the other hand, since the air outlets of the plurality of centrifugal blowers can be arranged so as to be separated from each other in the vertical direction, the wind speed distribution can be made uniform.

On the other hand, the fan coil unit of the present invention may have a structure in which a plurality of centrifugal blowers are alternately arranged so as not to overlap each other vertically. By adopting such a structure, the size can be reduced particularly in the vertical direction, and the wind speed becomes uniform in the horizontal direction. A plurality of motors and blowers are installed in the horizontal direction without increasing the size. There is an excellent effect that downsizing can be performed in the left-right direction compared to.

Further, in the fan coil unit of the present invention, it is possible to have a structure in which a plurality of rotary drives can be controlled to rotate and stop independently of each other. With such a structure, the amount of air can be adjusted only by rotating and stopping each of the rotary drives, so that the amount of air can be easily controlled and the structure of the rotary drive can be simplified.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the fan coil unit of the first embodiment, FIG. 2 is a plan view of the fan coil unit, FIG. 3 is a front view of the fan coil unit,
FIG. 4 is an explanatory diagram showing a wind speed distribution inside the fan coil unit.

The fan coil unit 10 of the present embodiment
As shown in FIGS. 1 to 3, two motors 14 each having a centrifugal blower fan 12 mounted at both ends of a rotating shaft 13 are vertically arranged in a box-shaped casing 11, and heat exchange is provided in front of the two motors 14. Vessel 15 is installed. With such a structure, the plurality of centrifugal blowing fans 12 are arranged in the vertical direction, so that the blowing capacity can be greatly increased.

Here, the wind speed distribution inside the fan coil unit 10 will be described with reference to FIG.
As shown in FIG. 4, from the fan mounting plate 16 that partitions the internal space of the casing 11 into a suction side and a discharge side,
Inspection of the wind speed distribution on the virtual plane 17 separated by 5 mm revealed that the distribution was more uniform than in the case of the conventional fan coil unit 70 shown in FIG.

That is, in the case of the fan coil unit 10, since air is blown from the air discharge ports 18 of the plurality of centrifugal blow fans 12 arranged in the vertical direction, the wind speed distribution is made uniform at a relatively short distance from the air discharge ports 18. And the occurrence of eddies or backflow is extremely small. Therefore, the air that has flowed out from the air discharge port 18 passes uniformly over the entire surface of the heat exchanger 15, and the heat exchange efficiency is greatly improved.

In the fan coil unit 10, since the wind speed distribution is uniform at a relatively short distance from the air discharge port 18, it is not necessary to increase the distance from the air discharge port 18 to the heat exchanger 15. Can be reduced in size.

Further, in the case of the fan coil unit 10, unlike the case where the blower capacity is improved by enlarging the motor and the centrifugal blower fan, the casing 11 and the fan mounting plate 16 that support the motor 14 and the centrifugal blower fan 12 are different.
Since it is not necessary to increase the thickness of the fan coil unit 10, the weight of the entire fan coil unit 10 does not increase significantly.

On the other hand, in the fan coil unit 10, since the blowing capacity is improved without enlarging the centrifugal blower fan 12, there is no increase in noise due to an increase in the wind noise of the centrifugal blower fan 12. Compared with the conventional fan coil unit having one electric motor having the same blowing capacity as the fan coil unit 10, the fan coil unit 10 was able to obtain the result that the noise was 6 dB lower.

Further, in the fan coil unit 10 of the present embodiment, the plurality of electric motors 14 are turned on and off independently of each other.
Since FF control is possible, each motor 14 is individually
Since the amount of air can be adjusted only by turning N and OFF, the amount of air can be easily controlled, and the structure of the electric motor 14 can be simplified. In addition, since a plurality of electric motors 14 are provided, even if one of the electric motors 14 breaks down, the other electric motor 14 can be operated, so that a situation in which the ventilation is completely stopped can be avoided.

Next, referring to FIGS. 5 and 6, a second embodiment of the present invention will be described.
An embodiment will be described. FIG. 5 is a side view showing the fan coil unit of the second embodiment, and FIG. 6 is a front view of the fan coil unit.

In the fan coil unit 20 of the present embodiment, a plurality of motors 22 u,
The motors 22u and 22d are arranged so that the rotation directions of the centrifugal blow fans 24u and 24d mounted on both ends of the rotation shaft 23 of 22d are opposite to each other, and the heat exchanger 25 is installed in front of them. is there.

Since the air discharge ports 26u and 26d of the centrifugal blow fans 24u and 24d are located at positions shifted to the side of the rotating shaft 23, the blow directions of the centrifugal blow fans 24u and 24d are the same and the rotational directions are opposite to each other. Electric motor 2
By arranging 2u and 22d, the air outlet 26
Since u and 26d can be arranged close to each other in the vertical direction, the size of the entire apparatus can be reduced.

The fan coil unit 20 has a structure in which the plurality of centrifugal blow fans 24u and 24d are alternately arranged so as not to overlap each other vertically, so that the size can be reduced particularly in the vertical direction. ,
The air can be blown evenly in the horizontal direction, and the size can be downsized in the left and right direction as compared with the case where a plurality of motors and blowers are installed in a horizontal direction without increasing the size.

Further, in the fan coil unit 20,
Centrifugal fan 24u, 24d blowing direction 27u, 27d
d can be changed, and in the present embodiment, the air discharge ports 26u, 2
The air exiting from 6d spreads and spreads, and the uniformity of the wind speed distribution is achieved.
Therefore, the heat exchange efficiency can be greatly improved. In addition, since the pressure loss when passing through the heat exchanger 25 is reduced, the capacity of the blower can be reduced, so that the energy consumption can be reduced and the noise generated can be reduced.

[0033]

According to the present invention, the following effects can be obtained.

(1) By adopting a structure in which a plurality of rotary drives having a centrifugal blower fan mounted on a rotating shaft are arranged vertically, the blower volume is increased and the wind speed distribution is made uniform. The heat exchange efficiency can be improved without increasing the size of the entire apparatus due to the increase in the size of the apparatus. In addition, an increase in wind noise of the centrifugal fan does not occur.

(2) The structure in which the direction of air flow of the centrifugal air blowing fan can be changed can be avoided, so that concentration of the air blowing direction can be avoided, so that the air velocity distribution when air is blown toward the same plane is made uniform. In addition, the direction of air flow of the centrifugal fan can be adjusted.

(3) The centrifugal blowers mounted on the plurality of rotary fans have a structure in which the rotary drives are arranged so that the rotation directions thereof are opposite to each other. Since they can be arranged close to each other in the up-down direction, the air discharge ports can be concentrated and the size of the device can be reduced. On the other hand,
Since the air discharge ports of the plurality of centrifugal fans can be arranged so as to be separated from each other in the vertical direction, the wind speed distribution can be made uniform.

(4) By employing a structure in which a plurality of centrifugal fans are alternately arranged so as not to overlap each other vertically, the size can be reduced in the vertical direction.
The wind speed is made uniform in the horizontal direction, and downsizing in the left-right direction can be achieved as compared with a case where a plurality of motors and blowers are installed in the horizontal direction without increasing the size.

(5) Since a plurality of rotary drives can be controlled to rotate and stop independently of each other, the amount of air can be adjusted by simply rotating and stopping each rotary drive individually, so that the air supply can be controlled. Air volume control is facilitated, and the structure of the rotary drive can be simplified.

[Brief description of the drawings]

FIG. 1 is a side view showing a fan coil unit according to a first embodiment.

FIG. 2 is a plan view of the fan coil unit of FIG. 1;

FIG. 3 is a front view of the fan coil unit of FIG. 1;

FIG. 4 is an explanatory diagram showing a wind speed distribution inside the fan coil unit of FIG. 1;

FIG. 5 is a side view illustrating a fan coil unit according to a second embodiment.

FIG. 6 is a front view of the fan coil unit of FIG. 5;

FIG. 7 is a plan view showing a conventional fan coil unit in which a motor and a fan are enlarged.

FIG. 8 is a front view of the fan coil unit of FIG. 7;

FIG. 9 is a side view of the fan coil unit of FIG. 7;

FIG. 10 is a plan view showing a conventional fan coil unit in which an electric motor and a blower fan are arranged in parallel in a horizontal direction without increasing the size.

FIG. 11 is an explanatory diagram showing a wind speed distribution inside a conventional fan coil unit in which a motor and a fan are enlarged.

[Explanation of symbols]

 10, 20 Fan coil unit 11, 21 Casing 12, 24u, 24d Centrifugal fan 13, 23 Rotary shaft 14, 22u, 22d Motor 15, 25 Heat exchanger 16 Fan mounting plate 17 Virtual plane 18, 26u, 26d Air outlet 27u, 27d Blowing direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Harada 4-1-1-13 Honcho, Chuo-ku, Osaka-shi, Osaka Inside the Osaka Main Store of Takenaka Corporation (72) Inventor Yukio Kuno Wada, Sasaguri-cho, Kasuya-gun, Fukuoka Prefecture 1034-4 Inside Kyoritsu Airtech Co., Ltd. (72) Inventor Takeshi Ueno 1034-4 Kyoritsu Airtech Co., Ltd. (72) Inventor Kenichi Nakajima 1034 Wada, Sakuragicho, Kasuya-gun, Fukuoka Prefecture 4 Inside Kyoritsu Airtech Co., Ltd.

Claims (5)

[Claims] 1. A fan coil unit comprising: a plurality of rotary drives having a centrifugal blower fan mounted on a rotary shaft, which are vertically arranged. 2. The fan coil unit according to claim 1, wherein the direction of air flow of the centrifugal fan can be changed. 3. A fan coil according to claim 1, wherein said centrifugal blowers mounted on said plurality of rotary drives are arranged such that the blow directions are the same and the rotational directions are opposite to each other. unit. 4. The fan coil unit according to claim 1, wherein the centrifugal fans are alternately arranged so as not to overlap in the vertical direction. 5. The fan coil unit according to claim 1, wherein the plurality of rotary drives can be controlled to rotate and stop independently of each other.