JPH0454859B2 - - Google Patents

Description

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

Conventional Technology Air handling units have traditionally been widely used for air conditioning in buildings, etc., but in recent years, control methods have become more sophisticated with the aim of improving comfort in air conditioning 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 5 is a damper. 6 is the air supply duct, 7
8 is an air-conditioned room, and 8 is a return air duct, which is 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 temperature setting section 12 and a comparison section 1 that compares the signal from the temperature detection section 11 and the signal from the temperature setting section 12.
3, a valve opening/closing command unit 14 that calculates and amplifies the signal from the comparison unit 13, and a start/stop command unit 15 that commands the blower 2 to start and stop. 16 is a valve that controls the permeability of the heat exchanger 3; 17 is a valve driving device that opens and closes the valve 16; The valve opening/closing command section 14 and the valve driving device 17, and the start/stop command section 15 and the blower 2 are electrically connected, respectively.

In the above configuration, the wind generated from the blower 2 returns to the air handling unit housing 1 via the supply air duct 6, the air-conditioned room 7, and the return air duct 8, and then returns to the air handling unit housing 1 through the filter 4 and the heat exchanger 3. The air is sucked into the blower 2 through the air. The damper 5 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 10.

Next, the operation and effect of the control device 10 will be explained.

FIG. 4 is a signal waveform diagram of the control device 10 of a conventional air handling unit. Note that the signal waveform in FIG. 4 shows the state when cold water is flowing through the valve 16 and the heat exchanger 3, that is, during cooling operation.

In FIG. 4, T ₀ , T ₁ . . . 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, at T ₀ , the detected temperature is higher than the set temperature, so a valve opening command is started, and the valve opening degree gradually increases as shown by the solid line until it becomes fully open, and this state continues until time T ₁ . At T ₁ , the detected temperature has decreased, so there is no need to open the valve as much as at T ₀ , and the valve closing command begins this time. Along with this, the valve opening degree gradually decreases, and when the valve closing command is discontinued, the constant opening degree is maintained, 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 configuration, the valve may become unstable due to factors such as the coefficient of friction between the valve body and the valve seat of the valve, changes over time, and fluctuations in water pressure and water temperature in the cold and hot water supply system. The torque required for the valve body to rotate in the case of a ball valve and the torque required to move up and down in the case of a globe valve changes, and even if the same valve opening command is given to the valve driving device, the time required changes, As a result, the opening degree often deviated from the expected value, as shown by the broken line in FIG. When the disconnection is on the closed side, the room temperature rises too quickly, and when it is on the open side, the room temperature decreases too quickly.In either case, there is a problem in that smooth room temperature control is 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 In order to achieve this object, the air handling unit of the present invention includes a blower that sends air that has passed through a heat exchanger into an air-conditioned room, and a generator that outputs a start/stop command signal to the blower. a stop command section, a temperature detection section that detects the temperature of the air-conditioned room, and a comparison section that compares the output of the temperature detection section and the output of the temperature setting section;
a valve open/close command unit that fully opens or fully closes a valve that controls the heat medium of the heat exchanger in response to an on signal from the start/stop command unit; a fully open/fully closed detection unit that detects whether the valve is fully open or fully closed; and a time measuring section that measures the time from fully open to fully closed or from fully closed to fully open of the valve based on the output of the fully open and fully closed detector, and the valve open/close command section measures the time from fully open or fully closed to the comparing section. The valve opening operation time or the valve closing operation time is determined based on the output of the time measurement section and the output of the time measurement section, and the opening and closing control of the valve is performed.

Effect According to this configuration, the valve fully open/fully closed detector sends detection signals for fully closed and fully open valves to the control device, and the control device measures the time required from fully closed to fully open and from fully open to fully closed. As a result, the valve opening can be controlled in response to torque changes when the valve drive device goes from fully closed to fully open and from fully open to fully closed. As a result, the valve opening is less likely to deviate from the desired value, and the valve opening can be smoothly controlled. The purpose of room temperature control can be achieved.

Embodiment An embodiment 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 handling unit according to an 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 detection section 21 electrically connected to the temperature sensor 9.
, a temperature setting section 22 , and a comparison section 23 that compares the signal of the temperature detection section 21 and the signal of the temperature setting section 22 .
, a fully open and fully closed detection section 24, a time measurement section that measures the time required from fully open to fully closed and from fully closed to fully open, a blower 2 start/stop command section 26, and a valve open/close command section 27. are doing. 28 is a valve that controls the amount of water flowing through the heat exchanger 3; 29 is a valve driving device that opens and closes the valve 28; and 30 is the valve 28 and the valve driving device 29.
This is a fully open/fully closed valve detector installed at the connection part with the valve. Valve open/close command section 27, valve drive device 29, start/stop command section 2
6 and the blower 2, the fully open and fully closed detector 24, and the valve fully open and fully closed detector 30 are electrically connected, respectively.

The signal waveform in FIG. 2 shows the state when cold water is flowing through the valve 28 and the heat exchanger 3, that is, during cooling operation.

In FIG. 2, T ₀ , T _{1 .} . . are operation timings of the valve opening/closing command unit 27. At T ₀ , the valve opening remains at a certain value. When the blower start/stop command is turned on, the operation timing of the valve open/close command unit 27 is T ₁
At this point, the valve opening/closing command unit 27 outputs a fully closed command. Then, the valve opening gradually decreases and finally reaches 0%. At this time, the fully open and fully closed detection section 24 outputs a fully closed signal. At the next operation timing _T2 , the valve opening/closing command section 27 gradually increases in size and finally reaches 100% valve opening. When this valve opening reaches 100%, a full open signal is output from the fully open/fully closed detection section 24. The time measuring unit 25 measures the period from the time when the fully open/fully closed signal from the fully open/fully closed detector 24 disappears until the fully open signal is output, and determines the fully open operating time t ₀ . Next, at operation timing _T3 , the valve open/close command section 27 outputs a fully close command again. Then, the opening degree of the valve gradually decreases,
Finally, the valve opening becomes 0%. When the valve opening reaches 0%, the fully open/fully closed detection section 24 outputs a fully closed signal again. The time measurement section 25 is a fully open and fully closed detection section 2
Measure the period from when the fully open signal from 4 disappears until the fully closed signal is output, and calculate the fully closed operation time.
Find ts.

The t ₀ and t _s obtained in the above operation are interpreted by the valve opening/closing command unit of the control device 20 as the operating time from fully closed to fully open and from fully open to fully closed, and are adjusted to correspond to the required opening degree of the valve 10. The valve opening/closing command section issues a command signal. That is, after operation timing _T4 , the valve opening/closing command section 27 outputs a valve opening/closing command signal based on the valve opening degree obtained from the output of the comparing section 23, but the output time of the valve opening command signal, i.e. The operating time for opening the valve is determined based on the fully open operating time t ₀ . For example, to set the valve opening degree to 40%, the valve opening operation time is determined as t ₀ ×0.4. Also,
The operating time to close the valve is the fully closed operating time.
This will be done based on ts.

After detection timing _T4 , the original temperature control operation begins, and the 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 changes in accordance with the timings of T ₄ , T ₅ . . . in FIG. 2, 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 detection signal from the valve fully open and fully closed detector. It can respond to changes in drive torque, the valve opening degree always accurately reflects the difference between the set temperature and the detected temperature, and room temperature control can be performed more smoothly, which has great effects.

[Brief explanation of the drawing]

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, Fig. 3 is a piping and wiring system diagram of a conventional air handling unit, and Fig. 4 is a diagram of the same signal. FIG. 2...Blower, 3...Heat exchanger, 20...Control device, 28...Valve, 29...Valve drive device, 30...
...Valve fully open and fully closed detector.

Claims (1)

[Claims] 1. A blower that sends the air that has passed through the heat exchanger into the air conditioned room, an on/off command section that outputs a start/stop command signal to the blower, a temperature detection section that detects the temperature of the air conditioned room, and a temperature detection section that detects the temperature of the air conditioned room. a comparison unit that compares the output of the temperature setting unit with the output of the temperature setting unit; a valve opening/closing command unit that fully opens or fully closes a valve that controls the heat medium of the heat exchanger based on an on signal from the start/stop command unit; a fully open/fully closed detection section that detects the fully open or fully closed state of the valve; and a time measuring section that measures the time from fully open to fully closed or from fully closed to fully open of the valve based on the output of the fully open/fully closed detector; The valve opening/closing command section determines the valve opening operation time or the valve closing operation time based on the output of the comparison section and the output of the time measurement section after measuring the time when fully opened or fully closed, and controls the opening and closing of the valve. Air handling unit equipped with