JP2624319B2 - Ventilation operation control device for air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation operation control device for a variable air volume (hereinafter referred to as VAV) type air conditioner.

2. Description of the Related Art An example of conventional ventilation operation control of a VAV type air conditioner will be described below with reference to the drawings. FIG. 3 is a diagram of an air conditioning system of a conventional example, FIG. 4 is an operation flowchart, and FIG. 5 is an operation stop flowchart. In FIG. 3, reference numeral 1 denotes an air conditioner in which a blower 2 ', a heat exchanger 3, a ventilator 4, a controller 5', and a controller 6 are provided. A plurality of VAV units 8 'are installed at the ends of the air outlet ducts connected to the air conditioner 1 to enable air conditioning in each room. In addition, an air supply duct 9 and an exhaust duct 10 are connected to the ventilator so that ventilation can be performed with outside air. A remote controller 11 is connected to each VAV unit 8 'so that operation can be performed for each room. Air conditioner 1
And a signal line 12 is connected between the VAV units 8 '.

 The operation will be described below.

First, the control of the ventilator 4 will be described with reference to the operation flowchart of FIG. After the air conditioning preparation is set by the controller 6, the VAV unit operation signal 13 starts, and then the operation is controlled to the ventilation device operation 14. Next, the operation stop flowchart of FIG. 5 will be described. When the VAV unit air-conditioning stop signal 15 is operated by the remote control 11 and the signal
The controller 5 determines whether the VAV unit is stopped or not, and instructs "continuous operation" 17 in the case of "NO". "YE
In the case of "S", commands of "air conditioner stop" 18 and "ventilator stop" 19 are issued and controlled.

Problems to be Solved by the Invention In the above system configuration, the air conditioner 1 and the VAV
It is necessary to connect the signal lines 12 between the units 8 ', so wiring work is troublesome and long signal lines 12 must be prepared. In addition, as the number of VAV units 8 'of the terminals increases, the number of inputs also increases as to the judgment / command function of the controller 5' of the air conditioner 1, and a complicated control is required.

The present invention has been made in view of the above problems, and provides a ventilation operation control that does not require complicated wiring and control.

Means for Solving the Problems Therefore, in the ventilation operation control of the air conditioner of the present invention, in order to solve the above problems, a frequency variable type blower in which the air volume is changed by changing the frequency provided in the air conditioner main body. A blow duct provided downstream of the variable frequency blower, a variable air flow unit provided in the middle of the blow duct, and a static air flow in the blow duct between the variable frequency blower and the variable air flow unit. A static pressure sensor for detecting pressure, a static pressure setter for setting a static pressure in the blow-out duct between the variable frequency blower and the variable air volume unit, and a static pressure setter connected to the suction duct or the air conditioner. It has a ventilation device incorporated in the main body, and a controller, wherein the controller makes the static pressure detected by the static pressure sensor become the static pressure set by the static pressure setting device. In addition to controlling the frequency of the variable frequency blower, when the frequency of the variable frequency blower becomes lower than a predetermined frequency, the operation of the ventilation device is stopped.

In the ventilation operation control device for an air conditioner of the present invention, with the above configuration, the frequency of the variable frequency blower is controlled so that the static pressure between the variable frequency blower and the variable air volume unit becomes the set static pressure. In addition, when the frequency of the variable frequency blower becomes lower than the predetermined frequency, the operation of the ventilator is stopped.

FIG. 1 is a diagram showing an air conditioning system according to an embodiment of the present invention.
The figure shows the operation flow chart.

Components having the same configuration as the conventional example are assigned the same reference numerals, and detailed description thereof will be omitted.

1 is an air conditioner, 2 is a frequency variable type blower which is provided in the main body of the air conditioner 1 and changes the air flow by changing the frequency, and 3 is an upstream side of the frequency variable type blower 2 in the main body of the air conditioner 1 The heat exchanger 4 provided in the air conditioner 4 is a ventilation device incorporated in the main body of the air conditioner 1. Reference numeral 5 denotes a controller having a static pressure setting device 5a therein. 6 is a controller,
Reference numeral 7 denotes an outlet duct provided downstream of the variable frequency blower 2, 8 denotes a VAV (variable air volume) unit provided in the middle of the outlet duct 7, 9 denotes an air supply duct connected to the ventilator 4, and 10 denotes ventilation. Exhaust duct connected to device 4, 11 is VAV
Each remote controller 20 of the unit is a static pressure sensor for detecting a static pressure in the blow-out duct 7 between the variable frequency blower 2 and the VAV unit 8. The controller 5 controls the frequency variable blower 2 so that the static pressure detected by the static pressure sensor 20 becomes the static pressure set by the static pressure setting device 5a.
When the frequency of the variable frequency blower 2 is equal to or higher than the predetermined frequency, the ventilator 4 is operated. When the frequency of the variable frequency blower 2 becomes lower than the predetermined frequency, the operation of the ventilator 4 is controlled. Is to stop.
The control flow of the components will be described with reference to FIG.
The “pneumatic operation signal” 21 is output from the controller 5 by the controller 6.
Commanded. The variable frequency blower 2 starts operating at "predetermined frequency operation" 22 preset for the static pressure setting device 5a. Then, the static pressure sensor 20 provided in the middle of the blow-out duct 7 performs “static pressure detection P” 23 and “comparison P with the set static pressure P _O.
= P _O ”24, if YES, an instruction of“ no frequency change ”25 is issued to the controller 5 to enter the air-conditioning standby operation. "P>
If YES in P _O ”26, a command for“ frequency reduction ”27 is issued and N
If it is O, a command of “frequency increase” 28 is issued, and the frequency is “is a predetermined frequency or more” 29. If YES, a command of “ventilation device operation” 30 is issued and the operation of the ventilator 4 starts. As soon as the air conditioning operation starts. If NO, the command of "ventilation device stop" 31 is issued, and the ventilator 4 is stopped, and the air conditioning standby operation is performed. As described above, the start / stop of the VAV unit 8 is performed from the remote controller 11, and the change in the static pressure of the outlet duct 7 due to the opening and closing of the damper of the VAV unit 8 is detected by a static pressure sensor.
The controller 5 controls the frequency of the variable frequency blower 2 so that the static pressure detected by the static pressure sensor 20 becomes the static pressure set by the static pressure setting device 5a. When the frequency of the second frequency is equal to or higher than the predetermined frequency, the ventilation device 4 is operated, and when the frequency of the variable frequency blower 2 becomes lower than the predetermined frequency, the operation of the ventilation device 4 is stopped. From the above results, the start / stop operation control of the ventilator 4 incorporated in the air conditioner 1 can be performed without the operation signal communication of the VAV unit 8.

Effect of the Invention As described above, the present invention provides a variable frequency blower that is provided in an air conditioner main body and changes the air flow by changing the frequency, and an outlet duct provided downstream of the variable frequency blower, A variable air volume unit provided in the middle of the blow duct, a static pressure sensor for detecting a static pressure in the blow duct between the variable frequency blower and the variable air volume unit, the variable frequency blower, A static pressure setting device for setting a static pressure in the blow-out duct between the variable air volume unit, a ventilation device connected to the suction duct or incorporated in the main body of the air conditioner, and a controller. The controller controls the frequency of the variable frequency blower so that the static pressure detected by the static pressure sensor becomes the static pressure set by the static pressure setting device,
When the frequency of the variable frequency blower falls below a predetermined frequency, the operation of the ventilator is stopped, so that the terminal
The operation status signal communication of the VAV unit and the air conditioner do not have to be carried out through wires, respectively. As a result, there is no wiring and the work is saved, and the control of the controller also receives and judges the signal from the static pressure sensor. It can be simple.

[Brief description of the drawings]

1 is an air conditioning system diagram of one embodiment of the present invention, FIG. 2 is a control flowchart of the present invention, FIG. 3 is a conventional air conditioning system diagram, FIG. 4 is a conventional operation control flowchart, FIG.
The figure is a flowchart of the stop control. 1 ... air conditioner, 2 ... variable frequency blower, 4 ...
Ventilation device, 5: Controller, 5a: Static pressure setting device, 7: Ventilation duct, 8: Variable air volume unit, 20: Static pressure sensor.

Claims (1)

(57) [Claims] 1. A variable frequency blower which is provided in an air conditioner main body and changes an air flow by changing a frequency, a blow duct provided downstream of the variable frequency blower, and a blow duct provided in the middle of the blow duct. A variable air volume unit, a static pressure sensor for detecting a static pressure in the blow-out duct between the variable frequency air blower and the variable air volume unit, and a variable air volume unit between the variable frequency air blower and the variable air volume unit. A static pressure setting device for setting a static pressure in the blow-off duct, a ventilation device connected to the suction duct or incorporated in a main body of the air conditioner, and a controller, wherein the controller is While controlling the frequency of the variable frequency blower so that the static pressure detected by the static pressure sensor becomes the static pressure set by the static pressure setter, the frequency of the variable frequency blower is controlled. When it becomes less than the predetermined frequency, the ventilation operation control device for air conditioner characterized by stopping the operation of the ventilator.