JP3353295B2 - Fan coil unit - Google Patents

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.

[0002]

2. Description of the Related Art When a plurality of air conditioning zones are individually air-conditioned by one fan coil unit, the fan coil unit and the plurality of air conditioning zones are connected by a duct, and a variable air volume (VAV) unit is provided at an outlet of each air conditioning zone. There is a system for providing air conditioning.

[0003]

However, when controlling the static pressure while changing the air volume of each air conditioning zone,
There is a problem that the control device becomes complicated and costs increase. Also,
Since the conventional fan coil unit has a small number of fans (for example, two), if a large number of fans are provided, for example, even if one fan breaks down, it is inconvenient and inconvenient and lacks safety. . Then, an object of the present invention is to provide a fan coil unit which solves these problems.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a DC motor having a heat exchange coil provided in a casing and having a drive circuit capable of changing a rotation speed.
A large number of blowers with a motor are independently provided in a plurality of stages and a plurality of rows, and partition members for dividing the inside of the casing into the stages of the blowers one by one or one row are provided so as to be attachable / detachable. Further, each blower is provided with an alarm unit for notifying the failure thereof, and is provided as an alarm unit for notifying the failure of the blower by detecting the rotation of the DC motor or an alarm unit for notifying the stop of the blower by detecting the air volume of the blower. Further, the heat transfer tube of the heat exchange coil was an elliptical tube.

[0005]

1 to 3 show an embodiment of a ceiling-mounted fan coil unit according to the present invention. The fan coil unit includes a hollow casing 1 in which heat exchange is performed. A plurality of blowers 3 provided with coils 2 and DC motors 4 are provided independently in a plurality of stages and a plurality of rows, and a partition member 13 for dividing the inside of the casing 1 for each stage of the blowers or for each line (in the example shown, for each line), Installation / removal
A plurality of air passages formed by the partition member 13
To a plurality of air conditioning zones C (see FIGS. 7 to 10).
Make individual correspondence according to the quantity. The blowers 3 are provided separately and detachably in a plurality of stages and a plurality of rows in the vertical direction so that the work becomes easy when the blower 3 breaks down or the heat exchange coil 2 is maintained.

More specifically, a heat exchange chamber 6 provided with a heat exchange coil 2 and a blower chamber 7 communicating with the heat exchange chamber 6 are formed adjacent to each other in a casing 1. 3 is provided. The casing 1 has an intake port 10 communicating with the blower chamber 7, an air supply port 11 communicating with the heat exchange chamber 6,
To form The air supply port 11 is provided for each divided portion B formed by dividing the inside of the casing 1 for each stage of the blower or for each row (in the illustrated example, for each row). The heat exchange coil 2 includes a partition member 13.
Are provided so as to extend over the divided portions B, B,. In this way, only one heat exchange coil 2 is required, and the number of various components such as coils and piping and the manufacturing cost can be reduced.

[0007] In the example shown in the figure, a plurality of upper and lower stages (two stages) and a plurality of left and right columns (five columns) are provided. It is formed on the heat exchange room adjacent surface D, and the blower 3
Are detachably mounted separately. When the blower 3 is of the push-in type, noise is reduced away from the air supply port 11. The blower 3 and the opening 8 are arranged in a lattice shape with respect to the air inlet / outlet surface of the heat exchange coil 2 as shown in the figure. In addition, the number of the blowers 3 is not limited to the illustrated example, and may be freely increased or decreased. The blowers 3 and the openings 8 may be arranged in a staggered manner with respect to the air inlet / outlet surface of the heat exchange coil 2.

The blower 3 is a small blower (fan),
Compact and energy-saving fan coil unit as a whole
Reduce costs, reduce vibration and noise, simplify the casing, and reduce product costs. If a fan coil unit that does not require high static pressure for air supply to a room or the like in the immediate vicinity, instead of a small number of conventional large-sized blowers, a large number of units capable of obtaining a corresponding total air volume (for example, By using the small blower 3 with the DC motor 4 which is twice or more and the sum of the number of stages and the number of rows is at least 4 and preferably 5 or more), it is possible to reduce the power consumption and the parts cost of the whole blower. In addition, since the small blower 3 is used, the thickness, strength, and weight of the casing 1 need not be increased to prevent noise and vibration. Furthermore, even if the blower 3 is of a push type, it is possible to blow air evenly over the entire heat exchange coil 2. The motor is
For example, instead of a large three-phase 200 V AC motor, a large number of small single-phase 100 V long-life brushless DC motors with good work efficiency and low power consumption are used.

As shown in FIG. 4, each blower 3 is provided with an alarm means E for reporting a failure thereof. Specifically, DC
Alarm means E for notifying the failure of the blower 3 by detecting the rotation of the motor 4. The alarm means E outputs a rotation signal to the motor, and a detector 15 for detecting the rotation of the motor. A drive circuit 24 for identifying a blower (motor rotation) abnormality, an alarm device 17 for reporting a blower (motor rotation) abnormality by an abnormality signal from the drive circuit 24,
Is provided.

For example, if the rotation of a certain DC motor 4 is stopped due to a failure while a rotation signal is being output during the operation of the fan coil, the alarm 17 reports which blower 3 (DC motor 4) has failed. Let In this case, the detector 15 only needs to have a function of detecting the presence or absence of rotation of the motor,
The detector 15 and the drive circuit 24 can be simplified. Further, when the detector 15 has a function of detecting the motor rotation speed, the detector 15 can be used for both the determination of the abnormality of the motor rotation and the feedback of the motor rotation speed, and high-precision control can be performed. For example, even if the rotation of the motor does not stop, the rotation speed command value from the drive circuit 24 and the rotation speed detection value from the detector 15 are compared, and the abnormal blower 3 (DC motor 4 ) Can also be reported.

The controller 18 issues a rotational speed command to the DC motor 4 via each drive circuit 24, and controls the air volume of each blower 3 individually steplessly or stepwise. The drive circuit 24 is constituted by a microcomputer or the like, and each DC motor 4
A drive circuit 24 capable of changing the rotation speed steplessly or stepwise is provided. Thereby, the air volume can be adjusted by the blower itself, and fine air conditioning can be performed. Thus, no damper is required, no pressure loss is caused, and the size of the blower 3 can be reduced. Further, when the rotation is controlled steplessly, the adjustment of the air volume and the humidity, the intermittent operation, the extremely small wind operation, and the like become easy. Note that the above-mentioned alarm means E only needs to have a function of reporting a failure such as abnormal rotation or abnormal stop of each DC motor 4, and is not limited to the above-described configuration, and may be freely changed.

FIG. 5 shows a case where an alarm means E for notifying the failure stop of the blower 3 by detecting an air flow rate of the blower 3 is provided. The alarm means E includes a sensor 23 for detecting the air flow of the blower 3 and a motor Output a rotation signal to the sensor and sensor 2
A drive circuit 24 for identifying a blower (air volume) abnormality based on a signal from the control circuit 3 and an alarm 17 for notifying a blower (air volume) abnormality based on an abnormality signal from the drive circuit 24 are provided. For example, during operation of the fan coil, if the wind of a certain blower 3 stops due to a failure while a rotation signal is output, the alarm 17
It informs which blower 3 has failed. In this case, the sensor 23 only needs to have a function of detecting the presence or absence of wind, and the sensor 23 and the drive circuit 24 can be simplified. Drive circuit 24
Has the same configuration as that of FIG.

As shown in FIGS. 1, 2, 6, and 7, the air supply port 11 is connected via a duct 12 to an air supply connection port 19 of a blow-out / suction unit 16 installed on a ceiling plate or the like. , The intake port 10 is connected to the blow-out / suction unit 16 through a duct 21.
To the return air connection port 20. By driving the blower 3, the air (return air) in the air conditioning zone C, which is partitioned as indicated by the dotted line, is sucked from the return air suction port of the blow-out / suction unit 16, passes through the duct 21, and passes through the filter 9 of the fan coil unit. The heat exchange coil 2
Heated or cooled in the air supply port 1 as hot air or cold air.
From 1 through the duct 12, air is supplied to each air conditioning zone C from the air supply outlet of the blow-out / suction unit 16. The solid and dotted outline arrows in all the drawings indicate the airflow direction.

Attachment / detachment of the partition member 13 is performed in such a manner that the number of blowers matches the air supply amount required for the size of the air conditioning zone C. For example, in the air-conditioning zones C having different sizes as shown in FIG. 8, the partition members 13 are attached so as to sandwich the blowers 3 in the middle row, and the partition members 13 are removed from other portions. Mounting of the partition member 13
The removal, that is, the increase or decrease of the number of divisions in the casing 1 is free, and the division may be made in all the rows of the blowers 3 as shown in FIG.

Although the blow-out / suction unit 16 is used in the illustrated example, the present invention can be applied to a case where the blow-out port and the suction port are separate as shown in FIG. Further, as shown in FIG. 10, a ventilation unit 22 having a total heat exchanger may be provided in the middle of an appropriate duct 21 on the intake port side of the fan coil unit to perform outside air processing.

In each of the above embodiments, the blower 3 is of a push type, but may be of a suction type. Further, in each of the above-described embodiments, a large number of blowers 3 may be separately detachably provided in a plurality of stages and a plurality of rows in the horizontal direction. For example, the fan coil units of the above embodiments are rotated 90 degrees around the horizontal axis so that the blowers 3 are arranged in multiple stages and multiple rows in front, rear, left and right.

In each of the above embodiments, as shown in FIG. 11, the heat transfer tube 14 of the heat exchange coil 2 is formed as an elliptic tube having a radially cut surface in an elliptical shape. It is most preferable that the major axis direction of the elliptical shape be substantially parallel to the blowing direction A in order to reduce the air resistance. Since the cross-section of the heat transfer tube 14 is formed into an elliptical shape having a small shape drag, the ventilation resistance is smaller and the pressure loss is reduced as compared with the case of the circular heat transfer tube, and the contact area of the heat transfer tube 14 with the air flow ( (Heat transfer area) increases, and the amount of heat transfer and heat exchange increases. Moreover, the blower 3 with the smaller DC motor 4
And reduce the number. Note that the heat transfer tube 14 may be a circular tube.

[0018]

According to the first aspect of the present invention, the air volume can be adjusted by the blower 3 itself and the air conditioning can be finely and individually controlled, and a variable air volume adjusting damper and a complicated control device are not required, and the cost can be reduced. Even after the fan coil unit is installed, the inside of the casing 1 can be freely divided by the number of blowers suitable for the required air supply amount of the air conditioning zone C by installing and removing the partition member 13, and suction / blow out with different maximum air volumes. Each air path can be formed independently. According to the second aspect of the present invention, it is possible to identify which blower 3 is out of order without performing regular inspections, which is convenient, maintenance is easy, safety is excellent, and the stopped blower 3 is operated without being stopped. Waste and danger can be avoided. According to the third aspect of the present invention, the pressure loss is reduced, and the small blower 3 can be used, so that the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is an explanatory diagram of a warning unit.

FIG. 5 is an explanatory diagram of another alarm means.

FIG. 6 is a perspective view showing a blow-out / suction unit.

FIG. 7 is a simplified explanatory diagram showing a connection example of a fan coil unit.

FIG. 8 is a simplified explanatory diagram showing another connection example of the fan coil unit.

FIG. 9 is a simplified explanatory diagram showing another connection example of the fan coil unit.

FIG. 10 is a simplified explanatory view showing still another connection example of the fan coil unit.

FIG. 11 is a sectional view of a main part of the heat exchange coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Heat exchange coil 3 Blower 4 Motor 13 Partition member 14 Heat transfer tube 24 Drive circuit E Alarm means

Continuation of front page (56) References JP-A-9-137960 (JP, A) JP-A-64-82199 (JP, A) JP-A-11-281084 (JP, A) JP-A-7-280330 (JP) JP-A-3-3999 (JP, A) JP-A-2001-173980 (JP, A) JP-A-9-133373 (JP, A) JP-A-55-8576 (JP, A) JP-A-64 -82199 (JP, A) Japanese Utility Model Showa 57-5626 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/02 102

Claims (3)

(57) [Claims] 1. A DC having a heat exchange coil 2 provided in a casing 1 and having a drive circuit 24 capable of changing a rotation speed.
A large number of blowers 3 with motors 4 are provided independently in a plurality of stages and a plurality of rows, and a partition member 13 for dividing the inside of the casing 1 for each stage or row of the blowers is detachably provided . Multiple airways formed
Individually for multiple air conditioning zones C according to the required air volume
A fan coil unit characterized by being made to work. 2. An alarm means E for notifying a failure of each blower 3 is provided. An alarm means E for notifying a failure of the blower 3 by detecting the rotation of the DC motor 4 or a blower by detecting an air volume of the blower 3. 3. The fan coil unit according to claim 1, wherein said fan coil unit is alarm means E for notifying said stop of said fan coil. 3. The fan coil unit according to claim 1, wherein the heat transfer tube of the heat exchange coil is an elliptical tube.