JPS62106244A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To permit control of a motor for air conditioning to a desired number of rotation by manual operation by a method wherein an inverter electric source, having a capacity up to a rating, or commercial electric source, having a capacity higher than the rating, is permitted to be connected selectively to the motor for air conditioning by a multi-converter in accordance with the magnitude of a load. CONSTITUTION:An analog signal according to an indoor temperature, detected by a detacting means 2 or a temperature sensor 21, is inputted into a multi-converter 3 while the level thereof is being adjusted on the way thereof. The multi-converter 3 catches the indoor temperature as a load and when it is an usual time or the load is lower than 80%, for example, the multi-converter 3 outputs a selection signal for connecting a motor 41 for an air feeding fan and the motor 42 and an exhaust fan, which are the motor 4 for air conditioning, to the inverter electric source 5, and a rotating number control signal for the motor 4, which consists of signals in accordance with the magnitude of the load. Upon a peak load in which the load is 80% or more of a full load, the multi-converter 3 outputs the selection signal for connecting the motor 41 to a commercial electric source 6 and the motor 4 can be rotated at a rated rotating speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is mainly concerned with measuring the conditions of large-scale buildings such as department store sales floors, kitchens, underground parking lots, and other rooms using temperature sensors and C
Monitored by a detection means such as an O sensor, and depending on the output from the detection means, an air conditioning motor, such as an air supply fan motor,
The present invention relates to an air conditioner that maintains the environment within each room at a constant level by operating an exhaust fan motor, a pump motor for circulating cold and hot water, etc.

(Prior Art) Conventionally, this type of device connects an air conditioning motor to a commercial power source having a capacity greater than the rated capacity of the air conditioning motor via a power switch, and connects the air conditioning motor to a commercial power source having a capacity greater than or equal to the rated capacity of the air conditioning motor, and connects the air conditioning motor to a commercial power source having a capacity greater than or equal to the rated capacity of the air conditioning motor. A comparator is provided to compare the output of the detector with a set value, and a two-position signal from the comparator corresponding to the output from the detection means is used to turn on and off the power switch to change the air conditioning motor between an operating state and a stopped state. An air conditioning motor is connected to an inverter power supply with a capacity R equal to the rated capacity of the air conditioning motor, and the output from the detection means that monitors the state of the room is controlled to maintain a constant indoor environment. It is known that the frequency of the inverter power source is changed accordingly and the rotational speed of the air conditioning motor is controlled to maintain a constant indoor environment.

(Problems to be Solved by the Invention) However, both of the above-mentioned conventional devices only operate automatically, and although the frequency is relatively infrequent, for example, when the contract power is about to be exceeded while the air conditioner is operating, Even when it is desired to forcibly control the air conditioning motor to a desired rotation speed by manual operation, regardless of the indoor condition, such as when installing an air conditioner or performing a test run, there is an inconvenience that this control cannot be performed.

Furthermore, according to the former of the above-mentioned conventional devices, since the rotation speed of the air conditioning motor is constant, there is an inconvenience that high-precision control cannot be performed. Since it is necessary to provide an inverter power source with a similar capacity and a relatively wide range of frequency variation, the cost of the entire air conditioner increases significantly and the efficiency deteriorates.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned disadvantages, and controls an air conditioning motor using an output signal from a detection means that detects indoor temperature, humidity, cog degree, etc. The air conditioner is equipped with a commercial power source and an inverter power source as power sources for the air conditioning motor, and a multi-converter connected to an external device such as a monitoring device and having a built-in signal generating means, the multi-converter comprising: The first command signal from the external device activates either the detection signal from the detection means or the second command signal from the external device, or the adjustment signal from the signal generating means activates the detection signal. A selection signal for connecting either the commercial power source or the inverter power source to the air conditioning motor according to the magnitude of the detection signal, the second command signal, or the adjustment signal during operation; It is characterized in that it outputs a rotation speed control signal.

(Function) For example, when maintaining the indoor temperature at a set value,
To explain based on the block diagram of FIG. 1, a monitoring device (11) is an external device (1) that monitors the indoor load condition.
When the first command signal for automatic operation is issued, an analog signal corresponding to the indoor temperature detected by the temperature sensor (21) serving as the detection means (2) is sent to the multi-converter (3) while its level is adjusted midway. is input. This multi-converter (3) takes the indoor temperature as a load, and in normal times when the load is, for example, 80% or more of the total load, the air supply fan motor (41) serves as the air conditioning motor (4).
And the exhaust fan's 7-terminal (42) is connected to the inverter power supply (5
) and a step signal corresponding to the magnitude of the load, such as the one shown in FIG. The motor (4) is rotated at a predetermined speed to control the air supply fan and exhaust fan and the amount of cold and hot water sent by the cold and hot water circulation pump, and the indoor temperature is controlled to the set temperature. , the interior of the room is maintained in a desired good environment, and at peak loads, which are 80% or more of the total load, the multi-converter (3) connects the motor (41) to the commercial power source (6).
), and in response to this signal, the motor (4) is rotated at the rated rotational speed, and the interior of the room is maintained in a good environment that is substantially the same as that in normal times.

Further, when the first command signal for manual VJ driving is issued from the monitoring device (11), the analog signal from the sensor (21) is no longer input to the multi-converter (3), and the monitoring device (11) The second command signal is input to the multi-converter (3), and the multi-converter (3) takes the second command signal as a load and outputs the selection signal and rotation speed control signal according to the magnitude of the load. The room is thus maintained in a desired environment.

This second command signal is used during automatic operation, for example, when the power supplied to the air conditioner is about to exceed the contracted power and the supplied power must be kept below the contracted power, or when the room temperature is forced to the desired temperature. It is emitted in infrequent cases such as when desired, and in these cases the motor (4) is kept at a constant rotation speed.

Furthermore, when an adjustment signal is emitted from the signal generating means (7>) built in the multi-converter (3), the sensor (2)
The analog signal from 1) and the second command signal are no longer input to the multi-converter (3), and the regulated signal is generated within the multi-converter (3), and the multi-converter (3) loads the regulated signal. The selection signal and rotation speed control according to the size of the load! 11
The double code is output, thus maintaining the desired environment in the room.

This adjustment signal is issued in infrequent cases, such as when the supply fan and exhaust fan must be operated at the minimum air flow rate to discharge contaminated indoor air to the outside, or when testing an air conditioner. In these cases, the motor (4
) is maintained at a constant rotation speed.

(Example) Next, the present invention will be explained based on illustrated embodiments.

Figure 3 shows an example in which the present invention is applied to air conditioning equipment in a high-rise building.In the figure, (8) and (9), bamboo is installed on the rooftop of an air supply fan, an exhaust fan, and a cold/hot water circulation system. 0V indicates the air supply/air distribution unit installed on the ceiling wall of each floor, and 11 does not indicate the exhaust unit installed on the side wall of each floor. The above configuration is not particularly different from the conventional one, and according to this, the air supply fan (8) supplies outside air to the air supply/air distribution unit 1 on each floor via the air supply duct q).
~(At the same time, the cold water or hot water sent to the pump (IO) is sent to the line drawing/7 air unit (11) via the cold/hot water pipe a, providing fresh water to the rooms on each floor. Cold or hot air is circulated, and the exhaust fan (9) discharges the contaminated air inside the room to the outside through the exhaust duct +- (ISl).

Here, the present invention includes a detection means (2) that detects indoor temperature, humidity, CO concentration, etc. and outputs an analog signal according to the detected value, and an external device (1) such as a monitoring device (11). It is equipped with a multi-converter (3) which is connected and has a built-in signal generating means (7), and a motor (41) of an air supply fan (8) which is an air conditioning unit (4), and a motor (41) of an exhaust fan (9). Each motor (41) (42) serves as a power source for the motor (43) of the pump a for circulating cold and hot water.
(43) A commercial power source (6
1) (62) (63) and each motor (4d (42)
The multi-converter (3) is equipped with inverter power supplies (51), (52), and (53) having a dropout less than the rated capacity M of the multi-converter (43). actuated by either the detection signal from the detection means (2) or the second command signal from the external device (1);
Alternatively, it is activated by an adjustment signal from the signal generating means (7), and depending on the magnitude of the detection signal, the second command signal, or the adjustment signal at the time of activation, either the commercial power source (6) or the inverter power source is controlling the air conditioning motor (4) by outputting a selection signal for connecting one of the two to the air conditioning motor (4) and a rotation speed control signal for the air conditioning motor (4);
The room was maintained in a desired good environment.

To explain this in more detail in the case of air conditioning, in the illustrated example, a temperature sensor (2,) consisting of a thermistor that outputs an analog signal corresponding to the indoor temperature is used as the detection means (2), and the temperature sensor (2, The analog signal from 21) is input to the comparator ae. The comparator (Ie) assumes that its set value, that is, the indoor temperature setting, is, for example, 26°C, and the actual indoor temperature is 26°C.
If the temperature is 6°C or higher, a 24V signal is output, and if the temperature is lower than 26°C, an OV signal is output.

A plurality of signals from the comparator ae corresponding to each room are sent to the microcomputer a71, where they are converted into an 8-bit digital signal, and this digital signal is further converted into a 4-20 mA analog signal by a D-Δ converter aε. It is converted into and input to the multi-converter <3).

The multi-converter (3) takes this analog signal from 4 to 2' Om as a load of 20 to 100% of the total load, and also converts the analog signal from 10 to 20+11 A to the [- terminal of the air supply fan (8). (41) and the rotation speed control signal of the motor (42) of the exhaust fan (9).
~9.9mA analog signal is sent to the cold water circulation pump (I
It is designed to be used as a rotation speed control signal for the motor (43) of the air supply fan (8), as shown in Figure 4.
), the control part of the motor (41) of the exhaust fan (9), the control part of the motor (42) of the exhaust fan (9), and the pump aO for cold water circulation.
and a control part for the motor (43).

Each of the above parts has external input terminals a! to which a first command signal for instructing automatic operation or manual operation is input from the external device (1) or monitoring device (11). Il ■,
DA converter (external input terminal for inputting analog signals from 4 to 20 IIl from
), for example, the external input terminal that inputs the second command signal to 17I11, which connects the air conditioning motor (4) to the inverter power supply (5), is a high-level off selection signal, and also the commercial power supply (6 ), the rotational speed control signal of the air conditioning motor (4) of the external output terminal from which a high-level ON selection signal appears, for example 4 shown in FIG.
External output terminal Q where the step signal to ~20m appears
Φ is provided, and therein is a signal generating means (■) which generates an adjustment signal of, for example, 10+n^, a signal from the external input terminal (■), a signal from the external input terminal, and a signal from the signal generating means (■). manually input these signals to the inverter power supply (5
) and commercial power supply (6), and the air conditioning motor (
Input the analog switch ■ which distributes and outputs the rotation speed control signal of 4), one of the signals distributed and output by the analog switch ■ (signal of 4 to 20 + 11A),
When a signal of 13mA or more is input, a high-level on signal is output, and when a signal of less than 18111A is input, a high-level off signal is output to the external output terminal ■ side, and a signal of 1QmA or less is input. The operational amplifier ■ outputs a low-level on signal to the internal output terminal when a signal exceeding 10 mA is input, and the other of the signals output from the analog switch ■ ( An operational amplifier (10 to 18 IIIA signal) is input, the gain and bias are adjusted, and a signal of 4 to 20 mA is output. A signal from the operational amplifier ■ via the internal output terminal is input, and the above three signal dimensions are input: the signal from the external input terminal 0, the signal from the external input terminal, and the signal from the signal generating means. A switching means ω for inputting one of the following to the analog switch ■
is provided.

In this case, the air conditioning motor (4) has a rated rotation speed of 150.
A three-phase induction motor (Or, D, m) is used, and an analog signal of 4 to 2 QmA from the operational amplifier is outputted from an 8-step step signal as shown in FIG. 2 in response to a digital signal from the microcomputer (+71). The rotational speed of the three-phase induction motor is divided into eight parts, for example, from 1500 r, p, m, depending on the size of the indoor load, and each divided rotational speed is output from the operational amplifier. It is now possible to respond to step signals at each stage.

When doing this, the indoor temperature on the representative floor is set to 26°C, the average load in the room is currently 50%, and the air supply (8) motor (41) and exhaust fan are automatically operated. Control the motor (42) of (9) to reduce the indoor temperature by 2.
When it is desired to maintain the temperature at 6°C, first, a first command signal for automatic operation is sent from the monitoring device (11) to each of the external input terminals (191) (192), and a signal from the [)-A converter 0e, e.g. The signal is the external input terminal (21+)
(212) through each analog switch Ci! 6 +)
Q62). Each analog switch QB
+) C1'62) sends a 12mA signal to the operational amplifier (28d29+) and operational amplifier (2B 2) (292
) and operational amplifier ■+) (29d outputs a high-level off selection signal that connects the three-phase induction motor to the inverter power supply (5+) (52), which is the external output terminal C!3+). ■2), and the operational amplifier (282) (292) outputs the rotation speed control signal of the three-phase induction transmission, that is, the step signal S4 of 14 mA, which is output to the external output terminal (24+) (242). Served.

Thus, the three-phase induction motor is a relay (31+) (312)
f) J - (umber'zTz source (51) (52
) 1. : It is operated at 750r02m, and the flow rate of cold air according to this rotation speed is supplied to each floor's air supply/air supply unit l'l.
The dirty air inside each room is sucked into each room from 'D' and discharged from the exhaust unit C'121 on each floor, and the temperature inside each room is maintained at a good environment of 26°C on average.

From this state, if the average indoor load on the representative floor changes to 80% due to an increase in the number of people or a rise in outside temperature, the indoor temperature will rise significantly from 26℃, and this change will be immediately detected by the thermistor. is sent to the multi-converter (3) via the comparator ae, the microcomputer q power, and the D-A converter ae, and the three-phase A high-level ON selection signal is output that connects the induction motor to the commercial power supply (6), and an operational amplifier (29d
(292) outputs a rotation speed control signal for the three-phase induction motor, that is, a step signal S8 of 18 mA.

Thus, the three-phase induction motor becomes a relay (31t) <312)
1500 by commercial power supply (61) (62)
It is operated at r, o9m, and cool air is sucked into each room from the air supply/transport unit IIT on each floor at a flow rate corresponding to this rotation speed, and dirty air from each room is released from the lJt air unit (Iz) on each floor. , the temperature in each room is maintained at around 26°C.

As mentioned above, when the average indoor load is 30% or more, a signal of 10 to 20 mA from the D-A converter a& is sent to the operational amplifier (2) that controls the rotation speed of the motor (43) of the cold water circulation pump qC. )3), the adjustment signal 20111A is sent from the signal generating means (25a) to the operational amplifier (293), so that the motor (43) rotates at the maximum rotation speed.

Additionally, the average indoor load on a representative floor may change to less than 30% due to a decrease in the number of people or a drop in outside temperature.
In this case, the temperature in the room will drop significantly from 26°C, and the change will be immediately detected by the thermistor, comparator ae and microcomputer (171 and D-
It is sent to the multi-converter (3) via the A converter ag, and the operational amplifier (28d) of the multi-converter (3)
(282) outputs a low-level ON selection signal that connects the three-phase induction motor to the inverter power supply (51) (52) to the external output terminal (23d), and internal output terminal (27+) (272). ) side, and a 10 mA step signal is output from the operational amplifier 291) (2).

Thus, the three-phase induction lightning i1+ machine relays (31+) (31
450 r by inverter power supply (51) (52) when 2) is not activated.

pm, and the minimum flow rate of cold air is sucked into each room from the air supply/extraction unit (1) on each floor, and the dirty air in each room is discharged from the exhaust unit (0) on each floor.

In addition, when the load is less than 30%, that is, the D-A converter ('
A signal of less than 10 mA from 181 indicates pump a for cold water circulation.
When the signal is input to the operational amplifier (233) that controls the motor (43) of
The rotation speed of 3) is reduced, and the temperature in each room is maintained at a good environment of 26° C. on average.

In addition, the step signal output from the operational amplifier ■1) (292) (29a) is the motor (41) (42)
In consideration of the follow-up delay and transient effects due to inertia etc. in (43), the change is made after a certain period of time has elapsed.

Fig. 5 shows an example of a concrete implementation of the multi-converter (3) shown in Fig. 4. In the figure, (32+) is the power supply for the left half circuit, and (1) is the right half circuit. Indicates the power supply.

(Effects of the Invention) As described above, according to the present invention, as a power source for an air conditioning motor, an inverter power source having a capacity φ less than the rated heat capacity of the inverter power source and a commercial power source having a capacity greater than the rated capacity, Both power supplies can be selectively connected to the air conditioning motor by a multi-converter depending on the load size, and the air-conditioning motor is connected via the multi-converter in response to a first command signal from an external device. It is possible to switch between automatic operation and manual operation using the external device.
Furthermore, since the air-conditioning motor can be operated by hand using an adjustment signal from the signal generating means, the air-conditioning motor can be manually controlled to the desired rotation speed regardless of the indoor conditions, making it possible to control the air-conditioning motor to a desired rotation speed regardless of the indoor conditions. It is possible to improve usability compared to the conventional device, and in addition, it is sufficient to include an inverter power source with a capacity less than the rated capacity of the air conditioning motor, and the cost of the entire air conditioner is significantly reduced. This has effects such as improved efficiency.

[Brief explanation of drawings]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is a diagram illustrating the relationship between the output signal from the multi-converter, the rotation speed of the air conditioning motor, and the indoor load, and Fig. 3 is a diagram illustrating the implementation of the present invention. FIG. 4 is a block diagram showing one embodiment of the multi-converter of the present invention, and FIG. 5 is a circuit diagram showing a specific embodiment of FIG. 4. (1)...External device (2)...Detection means (3)...Multi converter (4)...Air conditioning motor (5)...Inverter power supply (6)...Commercial power supply ( 1)...Signal generating means Fig. 1 Fig. 2 Chamber rj:l eh 8Nr (%)] 51j Fig. 4

Claims (1)

[Claims] An air conditioner in which an air conditioning motor is controlled by an output signal from a detection means that detects indoor temperature, humidity, CO concentration, etc., is equipped with a commercial power source and an inverter power source as power sources for the air conditioning motor, and also includes a monitoring device. A multi-converter is connected to an external device such as a device and has a built-in signal generating means, and the multi-converter receives a first command signal from the external device to generate a detection signal from the detecting means and a second signal from the external device. operates either with the command signal,
Alternatively, the air conditioner is actuated by an adjustment signal from the signal generating means, and depending on the magnitude of the detection signal, the second command signal, or the adjustment signal at the time of activation, either the commercial power source or the inverter power source is turned on to the air conditioner. An air conditioner characterized in that the air conditioner outputs a selection signal to be connected to an air conditioning motor and a rotation speed control signal for the air conditioning motor.