JPS61143647A - Air handling unit - Google Patents

Abstract

PURPOSE:To enable to control the room temperature smoother than ever, by a method wherein the times required for the signal of a valve full open-and full close detector to change from the full open state to the full closed state of a valve to change from the full closed state to the full open state of the valve are measured respectively in order to control the actuation of the valve based upon said times required and the signal sent from a sensor. CONSTITUTION:A controlling device consists of a temperature detecting part 21, which receives the signal from a temperature sensor 9, a temperature setting part 22, a comparing part 23, a full open-and-full close detecting part 24, a time measuring part 25, a start-and-stop instructing part 26 of a fan 2 and a valve actuation instructing part 27. In addition, a valve full open-and-full close detector 30 is provided in the junction part between a valve 28 to control the circulating flow rate of a heat exchanger 3 and a valve driving device 29. The valve actuation instructing part 24 and the valve driving device 29, the start-and-stop instructing part 26 and the fan 2 and the full open-and-full close detecting part 24 and the valve full open-and-full close detector 30 are electrically connected to each other respectively. Because the times required fro the signal of the valve full open-and-full close detector to change from the full closed state to the full open state of the valve and to change from the full open state to the full closed state of the valve are measured, the torque fluctuation during the driving of the valve can be coped with, resulting in correctly reflecting the opening of the valve with the difference between the set temperature and the detected temperature and accordingly smoothly controlling the room temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air handling unit used for air conditioning of buildings and the like.

Conventional technology Air-and-link units have traditionally been used for air conditioning in buildings, etc., but in recent years, control methods have become more sophisticated with the aim of improving air conditioning comfort and reducing operating power. .

Hereinafter, a conventional air handling unit will be explained with reference to the drawings.

FIG. 3 is a piping and wiring system diagram of a conventional air handling unit.

In Fig. 3, 1 is an air handling unit housing;
2 is a blower built into the air handling unit housing 1, 3 is a heat exchanger, 4 is a filter, and 6 is a damper. 6 is a supply air duct, 7 is an air-conditioned room, and 8 is a return air duct, which are connected to the air handling unit housing 1 to form a serial wind path. Reference numeral 9 denotes a temperature sensor installed inside the air-conditioned room 7, and is electrically connected to the temperature detection section 11 of the control device 10. The control device 10 further includes a wetness setting section 12, a comparison section 13 that compares the signal of the temperature detection section 11 and the signal of the temperature setting section 12, and a valve opening/closing command section 14 that calculates and amplifies the signal of the comparison section 13. and a start/stop command unit 15 that commands the blower 2 to start and stop. 16 is a valve that controls the amount of water flowing through the heat exchanger 3, and 17 is a valve drive device that opens and closes the valve 16. The valve opening/closing command section 14, the valve driving device 172, the start/stop command section 16, and the blower 2 are electrically connected, respectively.

In the above configuration, first, the wind generated from the blower 2 is sent to the air supply duct 6, the air conditioned room 7. The return air is returned to the air handling unit housing 1 via the return air duct 8 and filtered into the filter 4. The air is drawn into the blower 2 through the heat exchanger 3. The damper 6 adjusts the displacement amount and air supply amount by adjusting its rotation angle. On the other hand, the signal obtained by the temperature sensor 9 is input to the temperature detection section 11 of the control device 1°.

Next, we will discuss the operation and function of the control device 1o.

FIG. 4 is a signal waveform diagram of a conventional air link unit control device 1o. The signal waveform in Figure 4 is for valve 1.
6. This shows the situation when cold water is flowing through the heat exchanger 3, that is, during cooling operation.

In FIG. 4, To, T1, . . . are detection timings, and the valve opening/closing command time from that time is determined based on the magnitude relationship between the detected temperature and the set temperature at that time. Now T
. Since the detected temperature is higher than the set temperature, the valve opening command starts, and the valve opening gradually increases as shown by the solid line.
Eventually, it becomes fully open, and this state continues at time T1. At T1, the detected temperature has decreased, so it is not necessary to open the valve as much as at To, and the valve closing command begins this time. Along with this, the valve opening gradually decreases, and when the valve closing command is discontinued, it maintains a constant opening, and this state continues until time T2. Thereafter, the same detection, command, and operation are repeated, and the room temperature can be kept constant.

Problems to be Solved by the Invention However, with the above-described configuration, the above-described problems may occur due to changes over time in the coefficient of friction between the valve body and valve seat of the valve, fluctuations in water pressure and water temperature in the cold and hot water supply system, etc. The torque required to rotate a ball valve and the torque required for vertical movement of a globe valve to the valve body changes, and even if the same valve opening command is given to the valve driving device, the time required will vary. However, as a result, the opening degree often deviated from the expected value, as shown by the broken line in FIG. If the outside side is the closed side, the room temperature rises too quickly, and if it is the open side, the room temperature falls too quickly, and in either case, there was a problem that smooth room temperature control was hindered. .

In view of the above problems, the present invention provides an air handling unit that can more smoothly control room temperature.

Means for Solving the Problems To achieve this object, the air handling unit of the present invention includes a sensor provided at a position to be controlled, a valve for controlling the flow of the heat medium in the heat exchanger, and the valve. A valve driving device and a valve fully open and fully closed detector connected to the valve are connected to the blower, and a signal from the valve fully open and fully closed detector and a signal from the sensor are inputted, and a valve opening/closing command is sent to the valve driving device. The control device outputs the valve opening/closing command in conjunction with the corridor machine start/stop command, and changes the valve from fully closed to fully open. From fully open to fully closed, measure the time required for the signal from the valve fully open and fully closed detector from fully closed to fully open, and from fully open to fully closed, and based on this required time and the signal from the center/seat. The structure is such that the opening and closing of the valve is controlled by

Effect According to this configuration, since the time required for the valve to go from fully closed to fully open and from fully open to fully closed is measured, it is possible to measure the time required for the valve to change from fully closed to fully open and from fully open to fully closed. The valve opening degree can be controlled, and as a result, the valve opening degree is less likely to deviate from a desired value, and the purpose of smooth room temperature control can be achieved.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a piping and wiring system diagram of an air conditioning unit in one embodiment of the present invention, and FIG. 2 is a signal waveform diagram thereof. The configurations and operations of elements 1 to 9 are the same as those of the conventional embodiment described in conjunction with FIG. 1, and their explanations will be omitted.

In FIG. 1, 20 is a control device, and a temperature sensor 9
a temperature detection section 21 electrically connected to the temperature setting section 2;
2, a comparison section 23 that compares the signal of the temperature detection section 21 and the signal of the temperature setting section 22, and a fully open/fully closed detection section 24 that measures the time required from fully open to fully closed and from fully closed to fully open. It has a time measuring section, a start/stop command section 26 for the blower 2, and a valve opening/closing command section 27. 28 is a valve that controls the amount of water flowing through the heat exchanger 3, 29 is a valve drive device that opens and closes the valve 28, and 3o is a valve full-open/full-close detector provided at the connection between the valve 28 and the valve drive device 29. It is. Valve open/close command section 24, valve drive device 291, start/stop command section 26, and blower 2. The fully open and fully closed detector 24 and the valve fully open and fully closed detector 30 are electrically connected to each other.

The signal waveform in FIG. This shows the situation when cold water is flowing through the heat exchanger 3, that is, during cooling operation.

In Fig. 2, TO'``1...'' is the detection timing. At the time of To, the valve opening degree is maintained at a certain value. When the blower start/stop command is turned on, the detection timing T1
Then, the valve close command is turned on and the valve opening gradually decreases. When the valve opening reaches 0%, fully closed detection is turned on. At detection timing T2, the valve opening command is turned on and the valve opening degree gradually increases. When the valve opening reaches 100 degrees, full open detection is turned on. Fully closed detection is already turned off. Then, the operating time t is obtained. At detection timing T3, the valve closing command is turned on again, the valve opening changes from 100% to 04, and an operating time of 1 s is obtained during this time.

to and t8 obtained in the above operation are the control device 1
The valve opening/closing command part 4 interprets this as the operating time from fully closed to fully open and from fully open to fully closed, and the valve opening/closing command part issues a command signal to correspond to the required opening degree of the valve 10.

After detection timing T4, the original temperature control operation starts.
A valve opening/closing command unit issues a valve opening/closing command according to the deviation between the set temperature and the detected temperature. As a result, the valve opening is T4 in Fig. 2.
It changes in accordance with the timing of T6..., and the room temperature is kept almost constant.

Effects of the Invention As described above, the present invention measures the time required for the valve to change from fully closed to fully open and from fully open to fully closed using the valve fully open and fully closed detector, and therefore can respond to changes in valve driving torque. The opening degree of the valve always accurately reflects the difference between the set temperature and the detected temperature, and the room temperature can be controlled more smoothly, which has a great effect.

[Brief explanation of drawings]

Fig. 1 is a piping and wiring system diagram of an air handling unit according to an embodiment of the present invention, Fig. 2 is a signal waveform diagram of the same, and Fig. 3 is a diagram of the same signal waveform.
The figure is a piping and wiring system diagram of a conventional air handling unit, and FIG. 4 is a signal waveform diagram of the same. 2...Blower, 3...Heat exchanger, 20
...Control device, 28...Valve, 29...
... Valve drive device, 30... Valve fully open/fully closed detector. Name of agent: Patent attorney Toshio Nakao and 1 other person (branch) - 1 full throttle + I71 uniform Figure 2

Claims (1)

[Claims] A sensor provided at a position to be controlled, a valve for controlling the flow of heat medium in a heat exchanger, a valve driving device and a valve fully open/fully closed detector connected to the valve, a blower, and a valve fully open/fully closed detector. a control device that inputs a signal from the device and a signal from the sensor and outputs a valve opening/closing command to the valve driving device and a blower start/stop command to the blower, and the control device outputs a blower start/stop command to the blower. The valve opening/closing command is output in conjunction with the valve opening/closing command, and the valve is moved from fully closed to fully open, and then from fully open to fully closed, and the valve is output from fully closed to fully open, and from fully open to fully closed, from fully open to fully closed. An air handling unit that measures the time required for each signal and controls opening and closing of the valve based on the time required and the signal from the sensor.