JPH06101901A - Air blowing rate controller in concentrated air conditioning apparatus - Google Patents

Abstract

PURPOSE:To easily ensure desired indoor environment in a concentrated air- conditioning apparatus in which air sent from an air conditioner is branched and supplied into a room through a plurality of branch ducts by properly controlling a fan air flow rate from the air conditioner in response to a desired air flow rate to each room. CONSTITUTION:There is provided a concentrated control unit 41 which is electrically connected with a rotational speed control device 7 of a fan 6 of an air conditioner 1 and a terminal control unit 11 for controlling an air flow rate to be supplied through branch ducts. The concentrated control unit 41 issues an operation signal to each terminal control unit 11 or sets a rotational speed of the fan 6 for sending air suited for the total supplied air flow rate through each branch duct 9 after receiving operation conditions of each terminal control unit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centralized air conditioner for distributing air sent from an air conditioner into a room through a plurality of branch ducts, and in accordance with the required air quantity from each room, the air quantity to be blown by the air conditioner. It relates to a device for controlling the.

[0002]

2. Description of the Related Art An air conditioner having a cooler, a heater, a blower, etc. is installed at one or a plurality of places in a building to cool or heat outside air, return air or mixed air thereof, and to branch from an air supply duct. Centralized air conditioning equipment that distributes and supplies the air from the outlets of the ends of a plurality of branch ducts into the room is well known.

In this equipment, in order to maintain the temperature of each room or the temperature of different places in the same room at a desired predetermined temperature, an air flow sensor, a damper, a damper opening / closing motor,
A terminal control unit with an electronic control circuit is installed in each branch duct, and the supplied air volume detected by the air volume sensor is compared with the required air volume necessary to maintain the desired specified temperature by the electronic control circuit, and the supplied air volume is It is possible to send a drive signal for opening and closing the damper to the required air volume to the damper opening / closing motor, and at that time, control the rotation speed of the blower of the air conditioner according to the air volume supplied to each branch duct. 474
No. 97.

According to the blower rotation speed control technology disclosed in the above publication, when the dampers of all the terminal control units are not fully opened, the rotation speed of the blower is reduced because there is a surplus in the amount of blown air. When the supply air volume of the duct becomes insufficient, the opening of the damper is increased to compensate for the shortage, and even if the damper is fully opened, the rotation speed of the blower is increased only when the supply air volume is not sufficient for the required air volume. I am trying.

That is, since the operating condition of the blower is set on the basis of the terminal control unit in the fully open state and the blower is operated in a state where the amount of blown air is always insufficient, operating energy can be saved, but indoors Looking at it, since the supplied air volume tends to be insufficient with respect to the required air volume required to maintain the desired specified temperature, the specified temperature cannot be maintained and the desired indoor environment cannot be obtained. In particular, when air is distributed and supplied to multiple chambers by one air regulator, increasing the supply air volume in some chambers increases the damper opening in other chambers to secure its own supply air volume. A chain reaction occurs, in which the damper opening must be increased in other chambers as a result, and the amount of air blown is insufficient to reach the specified temperature until one of the dampers is fully opened. It may take a long time, or the specified temperature may not be reached.

[0006]

The problem to be solved by the present invention is to set the rotation speed of the blower on the basis of the supply air volume of the terminal control unit with the damper fully open, and to set the blower in a state where the air flow rate is always insufficient. In the above-mentioned conventional technique of operating, the supplied air volume cannot be made to follow the required air volume of the terminal control unit sharply, and it is extremely difficult to obtain a desired indoor environment.

[0007]

In order to solve the above-mentioned problems, the present invention provides a centralized air conditioner equipped with an air conditioner and a terminal control unit similar to the above-mentioned conventional equipment, in which the rotation speed of a blower is controlled. A centralized control unit electrically connected to the device and each terminal control unit is provided, and the terminal control unit is made to output the simultaneous operation signal and the individual operation signal including the arbitrarily set specified temperature, or in addition to this function It has a function to input and check the individual operation status from the terminal control unit, and based on the operation signal and individual operation status, set the rotation speed of the blower that sends air corresponding to the total amount of air supplied to each branch duct. The greatest feature is that the operation signal is supplied to the rotation speed control device of the blower by this means. Its feed just enough by the blower regardless of variations, to easily obtain the desired indoor environment sensitively follow is allowed to request air volume supplied air volume for each terminal control unit is intended to achieve the object of.

[0008]

When the air is supplied from the branch duct to the room, the central control unit sums the supplied air amounts and sets the rotation speed of the blower so as to send the air corresponding to the total amount. The supplied air volume fluctuates because it is controlled to match the required air volume to reach the desired specified temperature, but the air speed is constantly controlled by controlling the blower rotation speed over time according to this fluctuation. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an example of a centralized air conditioning system, which includes an air filter 2, a cooler 3, a humidifier 4,
Either the outside air, the return air, or a mixed air thereof is introduced into the air conditioner 1 having the heater 5 and the blower 6 to be cooled or heated. The air for cooling or heating is pressurized by the blower 6, and is distributed and supplied into the room through the air supply ducts 8 and the outlets 10 of the terminals of the plurality of branch ducts 9 branched from the air supply ducts 8. The blower 6 is operated by the rotation speed control device 7 at a predetermined rotation speed.

Each branch duct 9 has a terminal control unit 11
Are installed respectively. This unit 11 is shown in FIG.
Unit duct 1 inserted in the branch duct 9 with reference to FIG.
2 and a housing 13 attached to the outside thereof. The air flow sensor 14 and the damper 15 are installed in the unit duct 12, and the housing 13 includes a damper opening / closing motor 16 and an electronic control circuit 17. . Also,
A room temperature sensor 18 including a thermostat for detecting the temperature inside the room, a light emitting operation body 19 using an infrared light emitting diode for setting the room temperature to a desired designated temperature, and a light receiving section 2
Each terminal control unit 11 is equipped with a remote control type room temperature controller 21 consisting of 0 and 0.

Here, the control operation according to the above configuration will be described with reference to FIG.
The unit duct 12 will be described with reference to the block diagram of FIG.
The flow rate of the supply air detected by the air flow sensor 14 installed upstream of the damper 15 is sent to the comparison circuit 22 in the electronic control circuit 17. on the other hand,
When the occupant of the room operates the room temperature controller 21 to specify the desired room temperature, the specified temperature signal and the detected temperature signal corresponding to the actual room temperature detected by the room temperature sensor 18 are sent to the air volume setting circuit 23, Here, a required air volume signal corresponding to the difference between the two signal values is created and output to the comparison circuit 22.

The comparison circuit 22 compares the supplied air volume signal with the required air volume signal, and sends an opening / closing signal corresponding to the difference to the motor drive circuit 24. The motor drive circuit 24 sends a drive signal designating an operation direction and an operation amount to the damper opening / closing motor 16 based on the opening / closing signal to open / close the damper 15. In this case, for example, if the supplied air volume is less than the required air volume, the damper 15 is operated in the opening direction to a large or small amount according to the difference, but at that time, it is considered to reach the specified temperature in a short time without overrunning. ing.

Basically, one branch duct 9 having the above-mentioned terminal control unit 11 is provided in one room. In a room having a large floor area, the air from one branch duct 9 designates the whole room. It is impossible to reach the temperature. In such a case, as shown in FIG. 1, the required number of branch ducts 27 were branched from the branch duct 9 and then the branch control units 28 were provided. The branch control unit 28 is
Referring to FIG. 2, the branch unit duct 2 has a branch unit duct 29 inserted into the branch duct 27 and a branch housing 30.
Install the air flow sensor 31 and the damper 32 in 9,
The branch housing 30 includes a damper opening / closing motor 33 and an electronic control circuit 34.

In the branch control unit 28, FIG.
, The flow rate of the supply air detected by the air flow sensor 31,
That is, the supply air volume signal is the comparison circuit 3 in the electronic control circuit 34.
5, the required air volume signal obtained by the terminal control unit 11 is sent from the branch control output circuit 25 to the comparison circuit 35, and the supply air volume signal of the branch duct 27 and the required air volume signal for bringing the room to the designated temperature. Are compared by the comparison circuit 35 and an opening / closing signal corresponding to the difference is sent to the motor drive circuit 36, and the damper opening / closing motor 33 is driven by the driving signal designating the operation direction and the operation amount to open / close the damper 32.

That is, in the same room, by inputting a designated temperature to one terminal control unit 11, the same required air volume signal is also given to the other branch control units 28 so that the blown air volume is adjusted to the designated temperature. Is controlled, it is possible to bring the entire chamber to the designated temperature without instructing the designated temperature to all.

Since the above-mentioned operation is performed independently for each terminal control unit 11 of the branch duct 9, all dampers 1 are operated.
There is a significant difference in the total required air volume between when the air conditioner 5 is almost fully closed and when the air conditioner 5 is fully opened. However, the air blower 6 supplies the air matching the required air flow from the air conditioner 1. If the rotation speed is constantly controlled, the supply air volume can be made to follow the required air volume sharply, and the desired air volume can be supplied to obtain a desired indoor environment.

Therefore, in this embodiment, the input / output circuits 26 and 37 connected to the input terminals of the comparison circuits 22 and 35 are provided in the electronic control circuits 17 and 34, and these are connected to the central control unit 41. The central control unit 41 obtains the total amount of air supply of all the terminal control units 11 and the branch control units 28, and an operation signal in which the rotation speed of the blower 6 is set so as to send the air corresponding to the total amount to the air supply duct 8. Is output to the rotation speed control device 7 including, for example, an inverter.

Here, there are cases where the terminal control unit 11 installed in all the rooms of the building does not include the room temperature controller 21, and the building manager determines and manages the indoor environment. In such a case, the centralized control unit 41 has a function of operating the terminal control unit 11 and the branch control unit 28 simultaneously or individually, and outputs the simultaneous operation signal and the individual operation signal to the input / output circuits 26 and 37. Is used, and the above-mentioned operation signal is output based on these operation signals.

When the terminal control units 11 of all the rooms are equipped with the room temperature controller 21, only the terminal control units 11 of some rooms may be equipped with the room temperature controller 21. In such a case, in addition to the above functions as the centralized control unit 41, a function of inputting individual operating conditions and room temperature conditions of the terminal control unit 11 and the branch control unit 28, and an operation signal based on these information Is used to set and output. In this case, the setting of the designated temperature by the room temperature controller 21 and the setting of the designated temperature by the centralized control unit 41 may overlap, but it is preferable to give priority to the latter.

Display means such as a liquid crystal panel for displaying the operation command given to the terminal control unit 11 and the branch control unit 28 and the designated temperature, or the operating condition, the detected temperature and the designated temperature inputted from these, with time. In some cases, the centralized control unit 41 may be provided with one or both of the printing means for arbitrarily creating a document so that the situation of each room can be monitored and managed at one place.

The command and information are transmitted from the input / output circuit of the centralized control unit 41 to the input / output circuits 26 and 37 by sequentially connecting the signal lines 42 in series by using modular plugs. Even if there are many 11's, this can be easily done.

Next, the simultaneous operation signal output from the centralized control unit 41 for controlling the supply air amount of the branch duct 9 and the branch duct 27 is switched between heating and cooling, equalizing the initial condition, and all the dampers 15 and 32 at the start of operation. And the maximum operation of the blower 6, the designated temperature, and the full closing of all the dampers 15 and 32. The individual operation signals are the designated temperature of each room, the maximum opening and the minimum opening of each damper 15, 32, These signals are full closing and stopping the damper opening / closing motors 16 and 33. In addition, damper 1
Reference numerals 5 and 32 are opened / closed between the maximum opening for maintaining the maximum air volume and the minimum opening for maintaining the minimum air volume by the opening / closing signal based on the difference between the supply air volume signal and the required air volume signal to set the indoor temperature to the specified temperature. It works like this.

Further, the room temperature controller 21 is used to set and change the designated temperature in addition to the signals of the maximum opening, the minimum opening, the full closing of the dampers 15 and 32 and the stop of the damper opening and closing motors 16 and 33, which are the same as those described above. The dampers 15 and 32 are opened / closed so that an auxiliary signal such as a signal or confirmation is output to bring the room to a specified temperature. At this time, the central control unit 41 collects the opening degrees of the dampers 15 and 32, the designated temperature and the detected temperature of each chamber, that is, the individual operation status and the temperature status.

The blower 6 can satisfy the air conditioning function of the building if the maximum blowing capacity is set to be equal to the sum of the maximum supply air volume of all the branch ducts 9 and the branch duct 27 and the loss air volume. The supply air volume of each room can be expressed as a percentage of the maximum supply air volume by the branch duct 9 and the branch duct 27 of the room. Since the maximum supply air volume of each room is known at the design stage, this is set for each control unit 11, 28, 4
The total amount of air supply for each room is recorded in No. 1 and calculated by the operation signal set by the central control unit 41, and the amount of air supply detected by the terminal control unit 11 and the branch control unit 28 is converted into a percentage and concentrated. It is sent to the control unit 41, where it is returned to the supply air volume and summed. The operation of obtaining this total amount is performed over time, and the rotation speed of the blower 6 is constantly controlled so as to send air corresponding to the total supplied air amount.

The central control unit 41 may be installed in a central control room for disaster prevention, but as shown in FIG. 1, it is attached to the air conditioner 1 and an operation signal is sent from a remote control panel 43 in the central control room. May be given.

[0026]

According to the present invention, the supply air volume of each branch duct is controlled by constantly detecting the supply air volume of the branch ducts so as to eliminate the difference between the detected temperature of the room and the designated temperature. Based on the individual operation of the units, the centralized control unit is configured to set the rotation speed of the blower so as to send the air corresponding to the total supply air volume, so the blower is operated to control each terminal so that there is no excess or deficiency in the air volume. The required air volume required by the unit can always be supplied with a minimum differential pressure while saving energy and reducing noise. That is, it is possible to easily obtain the desired indoor environment by making the supplied air volume sensitively follow the required air volume for each terminal control unit.

[Brief description of drawings]

FIG. 1 is a schematic view of an example of a centralized air conditioning equipment.

FIG. 2 is a configuration diagram of an example of a terminal control unit and a branch control unit.

FIG. 3 is a block diagram of an electronic control circuit.

[Explanation of symbols]

1 air conditioner, 6 blower, 7 rotation speed control device,
9 branch duct, 11 terminal control unit, 14 air flow sensor, 15 damper, 17 electronic control circuit, 18 room temperature sensor, 21 room temperature controller, 41 centralized control unit,

Claims (2)

[Claims] 1. An air conditioner including a blower and a rotation speed control device therefor; an air volume installed for each of a plurality of branch ducts for branching air sent from the air conditioner from an air supply duct and distributing and supplying the air to a room. A terminal control unit including a sensor, a damper, and an electronic control circuit; and a centralized control unit that gives an operation signal of the blower to the rotation speed control device; the electronic control circuit arbitrarily sets a temperature detected in a room The required air volume required to keep the room at the specified temperature based on the difference from the specified temperature is compared with the supply air volume detected by the air volume sensor to open / close the damper so that the supply air volume becomes the required air volume. The centralized control unit outputs a simultaneous operation signal and an individual operation signal including the specified temperature to the terminal control unit, and based on these operation signals Serial is configured to output a driving signal to set the rotational speed of the blower sending air to meet the total amount of supply air volume of each of the branch ducts; that air volume control device for centralized HVAC characterized by. 2. The apparatus according to claim 1, wherein the centralized control unit inputs the individual operation status from the terminal control unit in addition to the configuration according to claim 1, and each branch duct is based on the individual operation status. An air flow rate control device for a centralized air conditioner, comprising a configuration for setting a rotation speed of the blower that sends air corresponding to a total amount of the supplied air flow rate and outputting an operation signal.