JPS62233636A - Air conditioner - Google Patents

Abstract

PURPOSE:To perform stabilized operation in an air conditioner by decreasing the opportunity where all dampers are off at the same time, by detecting thermal load to each room by a signal from a thermostat installed in each room, by setting the opening of each damper in accordance with the thermal load, and by controlling the damper, based on the determined opening. CONSTITUTION:An indoor unit 9 is installed in a site such as the attic of a building. A heat source 1 such as a heat pump, and a fan 2 are provided in the unit 9. A main duct 3 and branch ducts 13 being branched off to each room are connected to the indoor unit 9, and a damper 4 is provided to each branch duct 13. A thermostat 5 is provided in each room. A room-temperature detector and a room-temperature setter are provided to the thermostat 5. Thermal load to each room is detected by the thermostat 5, and the opening of each damper 4 is determined, based on the detected value. In such a manner, the opening of each damper 4 can be controlled.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a duct type air conditioner that employs a variable air volume control method that can independently adjust the room temperature of each room, and in particular to a method for controlling its damper. 〇 [Prior art] There are two types of VAT units in the variable air volume control (hereinafter referred to as VAT) system for duct type air conditioners: a throttle type and a bypass type.
There were two types: position control (on/off control) and proportional control.

The prior art related to the two-position control type of the aperture type includes the first
Japanese Utility Model Application Publication No. 58-81438 was published. This controls the damper on and off in order to reduce the temperature difference between the top and bottom of the room during heating and increase comfort.For example, when the current room temperature is lower than the bunk room room temperature during @history7. The damper was controlled to turn on and off so that the damper was at its maximum aperture, when it was above the minimum aperture, and when it was around the set room temperature, it was at a maximum aperture and a minimum aperture at certain intervals. The difference between the detection signal of the room temperature detection sensor and the signal of the room temperature setter is input to the differential amplifier, and is input to the on/off time difference generator together with the signal from the pulse generator, and an on/off control signal is output to the damper. At this time, the total air volume in the duct changes depending on the total opening degree of the multiple dampers, and the pressure rises and falls, but the pressure inside the duct is kept constant by controlling the capacity of the air conditioner's blower based on the detection signal from the pressure sensor.

Further, as a second prior art, Japanese Patent Laid-Open No. 119146/1983 is disclosed. This system was equipped with an electric or electromagnetic damper in the duct, and controlled the room temperature by controlling the damper to be fully open or partially open based on a signal from the room thermometer. Additionally, dampers in rooms that do not require air conditioning can be fully opened using a manual switch. A similar device is disclosed in Japanese Utility Model Application Publication No. 51-87949.

A third conventional technique is Japanese Patent Publication No. 169525. This is mainly aimed at improving the feeling of cold air during cooling, and while the total air volume of the duct is kept constant, this wind loss is sieved out to multiple outlets by operating a damper. When I looked at the exit, I could see the wind blowing intermittently. Japanese Patent Application Laid-open No. 159-49443 and Japanese Utility Model Publication No. 60-3251 have the same effect as the conventional wind speed control technology.
There are publications such as Publication No. 5.

However, the operation of the damper in the third prior art is not performed for the purpose of controlling the room temperature.

[Problem that the invention seeks to solve]

In the air conditioner according to the first conventional technology described above, the indoor temperature distribution during heating is changed and the room temperature can also be controlled to a set value, but the number of dampers is small and the damper opening degree is controlled to be fully open and fully closed. In this case, there are many occasions when all the dampers are fully opened at the same time, and the heat source equipment and the blower must be stopped and restarted each time.

In particular, in the case of residential systems, the number of rooms is small and forced ventilation is often not performed, so the above-mentioned problems are likely to occur.

In the second conventional air conditioner, the damper is controlled to be fully open or halfway open, so the heat source equipment and the blower do not have to be stopped frequently, but when the heat load is small, the room temperature is kept at the set value. There was a problem that it could not be controlled with sufficient accuracy.

This invention was devised to solve these problems, and its purpose is to provide an air conditioner with good indoor temperature distribution, good room temperature control, and fewer dampers that are fully closed at the same time. shall be.

[Means to solve the problem]

The air conditioner according to the present invention includes a heat load measuring means that is installed in each room and measures the heat load of each S building based on a signal from a room thermostat, and determines the opening degree of each damper based on the measurement result. The apparatus is provided with a damper opening degree determining means and a damper control means for controlling on/off of the damper based on this determination.

[Effect]

In this invention, the heat load of each room is measured based on the signal from the thermostat of each room, and the heat load of each room is measured.
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, on/off control of the damper based on a constant value.

〔Example〕

FIG. 1 is an overall configuration diagram of an embodiment of an air conditioner according to the present invention. As is clear from FIG. 1, this embodiment includes a heat source device (1) that generates cold air or hot air, and a blower r2).
and ducts (3) that distribute this cold or warm air to each room.
) and a damper (
4) and a room thermostat (5) installed in each room.
), the heat load in each room is measured by the heat load measuring means (6) which inputs the signal from the room thermostat (5), and the damper opening degree determining means (7) determines the opening degree of each damper based on the output. ), and the opening degree of each damper is controlled on and off by the damper control means (8) based on the output of the damper opening degree determining means (7).

FIG. 2 is a system configuration diagram of an air conditioner used in the embodiment of FIG. 1. (9) in the figure is an indoor unit installed in the ceiling of a house, and there is a heat source device (1) such as a heat pump inside.
Change the blower (2) and the filter GO to L ≧ Supt Jbtih M 11) b-t'jζrts Ms ≧ 10
1rt+WA'F folding-1-Z, hhfg converter Ql),
It consists of an outdoor unit installed outdoors. The damper (4) is operated by the V'AV unit placed in the middle of the main duct (3) connected to the α3 indoor unit (9), which branches off to each room (1). Built-in.

Similar is the air outlet connected to the end of each duct above (2
) is the inlet installed in each room, αη is the indoor unit (
9) is the ceiling suction port connected to the suction side, (to) is the control device attached to the indoor unit (9), α9 is the main duct (3)
) The temperature sensor and wire installed inside are the same. Although not shown, the room thermostat (5) is provided with a room temperature detector and a room temperature setting device. Also, one of the room thermostats (5) is F! It also serves as the main controller that controls the power supply and switches between heating and cooling.

FIG. 3 is a circuit diagram showing the overall electrical connections of the embodiment of FIG. 1. e21) in the figure is a control device! The microcomputer inside 1cI81 consists of 0PUfi, memory, timer (c), input circuit @, and output circuit. Of course each room thermostat C5), temperature detector α
11 An analog multiplexer to which the detection output of the pressure detector 11 is input; ri is an A/D converter that converts the output into digital; the output is given to the input circuit @. The wire is a heat source device controller consisting of an inverter connected to the output circuit □□□ via a photocoupler (3Oa), and its output side is connected to the heat source device (1). (3) is also a blower controller consisting of an inverter or a phase controller connected to the output circuit example via a photocoupler (30b), and is connected to the blower (2). (to) is also a damper controller consisting of a Stuching motor controller as a damper control means connected to the output circuit (26) via a photocoupler (300), and is connected to the damper (4).

(to) is a power source that supplies alternating current and direct current power to the control device (to).

Next, the operation of the above embodiment will be explained with reference to FIGS. 4 to 6 during heating operation. Figure 4 is a flowchart showing the control program for the damper control part stored in the memory of the microcomputer (to), Figure 5 is an explanatory diagram of the determining operation for determining the maximum opening of the damper, and Figure 6 is the operation result. FIG.

First, the room temperature (T1) and set room temperature (To) are input from the room thermostat (R) in each room via the analog multiplexer d, A/D converter, and input circuit. input to aptyb (step 0
41) o Then, the damper opening degree determining operation is started, and in the next step (end), the room number (N) is set to 1, and it is determined whether the damper (4) of the first room is currently in the on or off state. (step). The on/off state of the damper (4) is stored in the memory every time. Next, the heat load measuring means consisting of steps (to) to (to) is started. If the damper (4) is determined to be on in step @, the on time from the previous determination to the current determination is accumulated and stored in the memory space for each damper (4) (
Step @). Here, instead of the on time, the number of times it is determined to be on may be accumulated. After step (B) or when the damper is off at step (to), step (to)
Here, a predetermined temperature width t'ft is provided and the above T(1
, TI. If (To+t) <T1, it is determined that the damper is turned off at the step, and (To-t)≦
If T1≦(To+t), the damper is left in its current state and the process proceeds to step (6). T1<(To-t)
In this case, it is determined that the damper is turned on at the step wheel, and a damper opening determination operation is performed to determine the opening degree. In the above heat load measurement operation, the heat load is determined when the room temperature is (To-・t
) or ') (TI-t). In the damper opening determination operation, based on this ON time, if the previous ON time was short, as shown in FIG. 5, the damper maximum opening is set to be small. Note that a lower limit value is set for the damper maximum opening degree in consideration of room temperature controllability, so that the opening degree does not become too small. After that, clear the accumulated on time in step (goods) and proceed to step (6). From step (6), go back to step (to) and check the damper in the second room (
Similar judgments and decisions are made regarding 4), and similar operations are performed up to the last Nth one. These results are outputted to the damper controller 4 via the output circuit and the photocoupler (30o), and the opening degree of each damper (4) is changed (step). Although the details will be omitted hereafter, the detection signals from the temperature analyzer α9 and the pressure detector The capacity is varied, and the air temperature and pressure are controlled to be approximately constant.

The above control is repeated at regular intervals by a timer (c).

As a result, the damper (4) in the room where the room temperature is significantly higher than the set room temperature is continuously opened fully, and the damper (4) in the room where the room temperature is significantly lower than the set temperature is controlled to be fully opened, so that the room temperature is close to the set value. The damper (4) in a room with a large heat load is turned on and off with a wide opening, and the damper (4) in a room with a small heat load is controlled with a small opening. Warm air is from outlet α4
It is blown into the room more intermittently. When the damper (4) is on, the airflow has a large air volume (wind speed), so it reaches close to the floor.
The temperature difference between the upper and lower parts of the room becomes smaller, and the temperature distribution becomes better.

Figure 6 shows the results of damper (4) control and room temperature control at this time.The solid line shows the results when the conventional damper is controlled in two positions, fully open and fully closed, and the broken line shows the results when controlling the conventional damper in two positions, fully open and fully closed. What is shown is the control result according to this invention.

In conventional control, the supply heat starvation (air volume) when the damper (4) is on is too large compared to the heat load, so the room temperature quickly rises (To+t
), and the ratio of on-time during one cycle of damper (4) control is small. On the other hand, in the control according to the present invention, the current opening degree of the damper (4) is determined based on the time from the previous on to off time of the damper (4), so when the heat load is small and the on time is short, the opening degree of the damper (4) is gradually reduced. Since the maximum opening degree is lowered and the air volume is throttled, the on time increases and the on time ratio increases.

As a result, the chance that all the dampers (4) are turned off at the same time is reduced, the number of times the heat source jM (1) and the blower (2) are turned on and off is reduced, and stable operation can be performed.

In the above embodiment, the opening degree of the damper (4) is determined based on the previous ON time, but this may be determined based on the average value of the past several times. Further, the relationship between the opening degree and the time need not be linear but may be, for example, stepwise.

Further, in the above embodiment, the damper controller (2), the damper (4)
Although a stepping motor is shown as an example, other motors equipped with a plurality of limit switches may also be used.

Furthermore, in the above embodiment, the opening degree is determined in proportion to the on time of the damper, but since the on time is related to the gradient of room temperature change, the opening degree may be determined based on the magnitude of this gradient. .

〔Effect of the invention〕

As explained above, according to the present invention, a means for measuring the heat load in the room is provided, the opening degree of the damper is determined based on the result, and the damper is controlled based on the opening degree. This has the effect of increasing the on time, reducing the chance that all dampers are turned off at the same time, and allowing stable operation of the heat source unit and blower.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram according to an embodiment of this invention, Fig. 2 is a system configuration diagram according to an embodiment of this invention, Fig. 3 is an electric circuit diagram according to an embodiment of this invention, and Fig. 4 is similar to Fig. 3. FIGS. 5 and 6 are flowcharts for explaining the operation of the system shown, and FIGS. 5 and 6 are explanatory diagrams for explaining the present invention in detail. In the figure, (1)...Heat source machine, (2)...Blower, C3)...Duct, (4)...Damper, (5)...
... room thermostat, (6) ... heat load measuring means, (7) ... damper opening degree determining means, (8) ... damper control means. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In an air conditioner that controls dampers installed in each branch of a duct that passes hot or cold air from a heat source device and a blower based on signals from a room thermostat located in each room, a heat load measuring means for measuring the heat load in each room using the signal;
Damper opening determining means determines the opening of each damper based on the output of the thermal load measuring means; An air conditioner comprising damper control means for on/off control. (2) The air conditioner according to claim 1, wherein the heat load measuring means measures the damper on time until the indoor temperature of each room increases by a predetermined temperature difference. (3) The air conditioner according to claim 1 or 2, wherein the damper opening degree determining means is configured to set a small damper opening degree when the heat load is small.