JPH03236540A - Controlling device of damper of air handling unit - Google Patents

Abstract

PURPOSE:To make it possible to control the intake amount of the outdoor air, by a method wherein the velocity of the outdoor air detected by an air velocity detector in a duct is measured as an input signal, the intake amount of the outdoor air is set, an output obtained from measurement of the velocity of the air and an output obtained from setting of the intake amount of the outdoor air are compared with each other, the amount of operation of an outdoor-air damper is determined and the outdoor-air damper is controlled. CONSTITUTION:The velocity of the outdoor air passing through a duct 18 is detected by an air-velocity detector 19, a signal obtained from detection is sent to an air-velocity measuring means 20, the intake amount of the outdoor air set by an outdoor-air intake amount setting means 21 and the intake amount of the outdoor air detected by the air-velocity measuring means 20 are compared with each other, the amount of operation of each damper is determined by a damper operation amount determining means 22, a signal of this means is sent to a damper driving means 23, and an outdoor-air damper 6, a damper 7 for ventilation and a damper 10 for exhaust are controlled by the damper driving means 23. The intake of the outdoor air in a fixed amount is made possible irrespective of controls on the amounts of air of a air-feeding blower 2 and a ventilation blower 4 which are executed by an output of a voltage-variable frequency converter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a damper control device for an air handling unit installed in offices, buildings, etc.

2. Description of the Related Art In recent years, damper control devices for air handling units using microcomputers have become mainstream.

The structure of a conventional damper control device for an air handling unit will be described with reference to FIGS. 2 and 3.

As shown in the figure, inside the housing 1 of the air handling unit, there is an air supply channel 3 provided with an air supply blower 2 for supplying air into the room.
A return air flow path 6 is formed with a return air blower 4 that returns indoor air, and the supply air flow path 3 includes an outside air damper 6 that communicates with outside air, and a return air flow path 6 that communicates with the outside air. A damper 7 for return air is provided, and a filter 8 and a heat exchanger 9 for supplying cold water or hot water for heat exchange are provided in the air supply flow path 3. Further, the return air passage 5 is provided with an exhaust damper 1o for discharging the air to the outside and a temperature detector 11 for detecting the temperature of the air-conditioned section.

The control device includes a temperature measuring means 12 that inputs the temperature signal from the temperature detector 11, and a VVVF operation amount determining means 14 based on the deviation amount obtained from the temperature measuring means 12 and the air conditioned part temperature setting means 13. Yoshi VVV
The operation amount of F15 (voltage variable frequency converter) is determined, and the rotation speed (air volume) of the supply air blower 2 and return air blower 4 of the air handling unit is determined by the output signal from the VVVF operation amount determination means 14. In addition to controlling the V
The output signal from the VVF operation amount determining means 14 and the damper operation amount determining means 17 obtained from the damper operation amount setting means 16 determine the operation amounts of the outside air damper 6, the return air damper 7, and the exhaust damper 10, The damper is configured to control each damper of the air handling unit.

With this configuration, as shown in FIG.
Each damper was controlled to have a stepwise characteristic for the control output of 0 to 10V to the damper.

Problems to be Solved by the Invention In such a conventional damper control device for an air handling unit, the control output 0 to 10 V to the VVVF 15 has a linear characteristic, whereas the operation of each damper has a stepwise characteristic. In addition, since the opening degree of the damper is fixed with respect to the output of the VVVF 15, the reduction in air volume due to filter clogging is not taken into consideration, and there is a problem that the amount of outside air taken in cannot be kept constant.

The present invention takes the above-mentioned problems into consideration, and has a very simple configuration to achieve VV
It is an object of the present invention to provide a damper control device for an air handling unit that is capable of controlling the damper to keep the amount of outside air intake constant regardless of the output of the VF.

Means for Solving the Problems In order to achieve the above object, the present invention includes a wind speed detector for detecting wind speed in a duct, a wind speed measuring means for measuring the wind speed detected by the wind speed detector as an input signal, and a wind speed measuring means for measuring the wind speed detected by the wind speed detector as an input signal. an outside air intake amount setting means for setting an intake amount; and an outside air damper that compares and determines the output from the wind speed measuring means and the output from the outside air intake amount setting means and adjusts the outside air intake amount. The damper operation amount determination means for determining the operation amount is provided, and the damper driving means is provided for controlling the outside air damper based on the output from the damper operation amount determination means.

Function: With this configuration, the output from the wind speed measuring means that measures the wind speed in the duct and the outside air intake amount setting means that sets the amount of outside air intake are compared, and the damper is controlled to adjust the amount of outside air intake. Constant control will be performed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. Note that parts that are the same as those in the prior art are given the same numbers and detailed explanations will be omitted.

As shown in the figure, a duct 18 for taking in outside air is connected to the outside air damper 6, and within one day, the duct 18
A wind speed detector 19 for measuring the wind speed inside the duct is incorporated in the housing. A wind speed measuring means 20 for inputting a signal from the wind speed detector 19 and an outside air intake amount setting means 21 for setting an outside air intake amount are provided, and the wind speed measuring means 2o and the outside air intake amount setting means are provided. The damper operation amount determining means 22 controls the outside air damper 6, the return air damper 7, and the exhaust damper 10 based on the wind speed deviation amount determined from the wind speed deviation amount determined from the damper operation amount determining means 22. This damper operation amount determining means 22
The output is given to the damper driving means 23, and based on this output, the outside air damper 6, the return air damper 7, and the exhaust damper 10 attached to the housing 1 of the air handling unit are controlled.

To explain the operation of the above configuration, the wind speed of the outside air passing through the duct 18 is detected by the wind speed detector 19, the detected signal is sent to the wind speed measuring means 20, and the outside air intake amount setting means 21 sets the wind speed. The outside air intake amount detected by the wind speed measuring means 20 is compared with the outside air intake amount detected by the wind speed measuring means 20, and the operation amount of each damper is determined by the damper operation amount determining means 22, and the signal is sent to the damper driving means 23. The outside air damper 6, the return air damper 7, and the exhaust damper 10 are controlled by the damper driving means 23.

For example, when the filter 8 becomes clogged and the wind speed decreases, the wind speed of the outside air passing through the duct 18 also decreases. The opening degree of the outside air damper 6 is widened so that the amount of intake reaches the set amount, and the amount of outside air passing through the outside air damper 6 is increased so that a constant amount of outside air is taken in. As described above, according to the damper control device for the air handling unit of the present invention, the wind speed detector 19 is provided in the duct 18 that takes in outside air, and the duct 1
The opening degree of the damper 6 for outside air is controlled by comparing the amount of outside air passing through the outside air intake 8 with a preset outside air intake amount. A constant amount of outside air can be taken in regardless of the air volume control of the button and the return air blower 4, and even if the air volume decreases due to filter 80 clogging, changes in the wind speed in the duct 18 through which outside air passes can be quickly controlled. The intake amount of outside air can be adjusted by

Effects of the Invention As is clear from the above embodiments, according to the present invention, a constant amount of outside air can be taken in regardless of the output of the VVVF with an extremely simple configuration that includes wind speed measuring means and outside air intake amount determining means. Furthermore, it is possible to provide a damper control device for an air handling unit that can prevent a decrease in air volume due to filter clogging.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a damper control device of an air handling unit according to an embodiment of the present invention, Fig. 2 is a block diagram showing a damper control device of a conventional air handling unit, and Fig. 3 is a graph of the damper characteristics. be. 6... damper for outside air, 18... duct, 19... wind speed detector, 20... wind speed measuring means, 21... outside air Intake amount setting means, 2
2... Damper operation amount determining means, 23...-
...Damper drive means.

Claims (1)

[Claims] a wind speed detector that detects the wind speed in a duct that takes in outside air; a wind speed measuring means that measures the wind speed detected by the wind speed detector as an input signal; an outside air intake amount setting means that sets the outside air intake amount; damper operation amount determining means for comparing and determining the output from the wind speed measuring means and the output from the outside air intake amount setting means and determining the operation amount of the outside air damper for adjusting the outside air intake amount; A damper control device for an air handling unit, comprising a damper drive means for controlling the outside air damper based on an output from a manipulated variable determining means.