JPH0323820B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and more particularly to a drive control circuit for an electric actuator for a cold water flow control valve and an air damper for temperature adjustment.

In an air conditioner, a temperature sensor detects the temperature of the area where the temperature should be adjusted, compares this with the target temperature to obtain an adjustment signal, and operates an electric valve drive circuit based on this adjustment signal to control the electric valve. Temperature is controlled by operating a valve and adjusting the amount of cold water flowing into the heat exchanger. In some cases, instead of adjusting the amount of cold water, a method is adopted in which the amount of air is adjusted by controlling an air damper. Of course, both methods may be used together.

By the way, when controlling the temperature of multiple areas with one piece of equipment, electric valves and air dampers are provided corresponding to the temperature detectors of each area, and motors, etc. as operating devices for each area are adjusted to the corresponding detected temperature. It is controlled and driven based on an adjustment signal determined from a target value. Such actuators are typically rated at 24V
It is connected to the secondary side of the transformer that transforms the commercial power supply to receive power, but when using multiple electric valves and air dampers as mentioned above, their electric power The actuator is connected in parallel to the secondary side of this transformer. In this case, the electric valves and air dampers corresponding to each temperature-controlled area must operate all at once when the air conditioner starts operating, and since the temperature changes in each area are all independent of each other, each electric valve and air damper must operate simultaneously when the air conditioner starts operating. Considering that the operation of the valves and air dampers is also independent of each other, the transformer and wiring that provides power for the electric valves and air dampers must have a sufficiently large capacity to allow all electric valves and air dampers to operate simultaneously. I needed to have one.

However, in reality, the all-electric valves and air dampers do not often operate at the same time, except when the air conditioner starts operating, and this rarely happens, especially when there are few temperature-controlled areas. Therefore,
The use of large capacity transformers and wiring is uneconomical as the air conditioner is over-equipped most of the time when it is in operation.

Referring to FIG. 1, in a drive control system for a plurality of electric actuators in a conventional air conditioner, a commercial AC power source 1 is transformed by a transformer 2, and a drive circuit for a plurality of electric actuators 3 is provided on the secondary side of the transformer 2. 4 are connected in parallel. 5
is a drive signal generation circuit corresponding to each operating device 3, which obtains an adjustment signal from the detected temperature and target temperature of the corresponding area, outputs a drive signal to operate the drive circuit 4 from the control signal, and controls the operation of the drive circuit 4. It is something to do. By this controlled operation of the drive circuit 4,
The operating device 3 is driven to adjust the opening degree of the valve or damper. In this way, the amount of cold water or air that corresponds to the desired temperature can be obtained.

In the case of this conventional device, as mentioned above, the transformer 2 and the wiring capacity are large enough to allow all the actuators to operate simultaneously, so that each actuator can operate independently of each other. selected for the value. As mentioned above, this results in excessive equipment and is uneconomical.

The present invention eliminates excessive equipment for power sources for driving electric valves and air dampers in such air conditioners,
The aim is to reduce the cost of air conditioning equipment, improve safety, and simplify installation work.

For this purpose, the present invention operates sequentially when drive signals for a plurality of actuators coexist, thereby preventing the plurality of actuators from operating simultaneously. This greatly reduces the capacity of transformers and wiring.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 2, the illustrated embodiment has the following points except that the output of the drive signal generation circuit 5 is not directly supplied to the corresponding drive circuit 4, but is supplied via the relay control circuit 6. The circuit diagram is similar to the conventional one shown in FIG. In the figure, parts similar to those in FIG. 1 are designated by the same reference numerals.

The relay control circuit 6 relays the output of each drive signal generation circuit 5 to the corresponding drive circuit 4.
When a signal from one drive signal generation circuit is input, if a drive signal from another drive signal generation circuit has already been relayed, the drive signal from the one drive signal generation circuit is not relayed and This circuit is configured to relay the drive signal only after the drive signal being relayed disappears.

With such a configuration, the load on the transformer 2 is always one, so the transformer 2 and wiring capacity only need to cover one load, so it is much simpler than the conventional one. reduced to

Of course, if there are a large number of controllers, there is a high probability that some of them will operate at the same time. It may be configured such that drive signals for a small predetermined number of devices can be relayed simultaneously. Even in this case, the capacity of the transformer and wiring can be significantly reduced, and the uneconomical effects of excessive equipment can be prevented while preventing a significant delay in the operation of each operating device.

FIG. 3 is a block circuit diagram showing an embodiment of the present invention when there are generally n operating devices.
6 corresponds to 1 to 6 in FIG. 2, but the operating device 3, drive circuit 4, and drive signal generation circuit 5 are shown with subscripts 1 to n in order to distinguish each of them. For the sake of simplicity, only those indicated by suffixes 1 and n are illustrated, and the others are omitted because they have the same configuration.

Each motor 3-1,..., 3-n is connected to the transformer 2,
T ₁ connected to one line l ₁ on the next side, and two terminals T ₂ and _{T 3 selectively} connected to the other line l 2
The direction of rotation of the motor is opposite when T ₂ is connected and when T ₃ is connected.

Each drive circuit 4-1,..., 4-n is a circuit that supplies the output of the transformer 2 to the corresponding motor to operate the motor, and includes two bidirectional three-terminal thyristors (hereinafter simply referred to as thyristors) 41. , 42. Thyristor 41 connects power line l ₂ to terminal T ₂ when conductive, while thyristor 42 connects power line l ₂ to terminal T ₃ when conductive.

Each of the drive signal generation circuits 5-1,..., 5-n generates an adjustment signal _S1 that indicates the amount of adjustment of the operating device by comparing the detected temperature from a temperature detector (not shown) with a set target value. A regulator 51 that sends out a voltage signal, a voltage divider 52 that operates in conjunction with a corresponding operating device, converts the resistance change of this voltage divider into a voltage change, and sends out a voltage signal _S2 corresponding to the opening degree of the electric valve or air damper. It has a resistance voltage converter 53 and a comparator 54 that compares both signals S ₁ and S ₂ and sends out the error as a drive signal. The comparator 54 sends out signals to different signal lines when S ₁ > S ₂ and when S ₁ < S _{2 .}
When = S ₂ , the output is zero. Now, the drive signal when S ₁ >S ₂ will be called a "+" signal, and the drive signal when S ₁ <S ₂ will be called a "-" signal.

The relay control circuit 6 connects each drive signal generation circuit 5-
A relay circuit 6- that relays drive signals from 1,..., 5-n to corresponding drive circuits 4-1,..., 4-n.
1,...,6-n. Each relay circuit is a circuit that relays the "+" drive signal to the control terminal of the thyristor 41, and includes a circuit including an AND gate 61, a flip-flop 62, an inverter 63, and a "-" signal.
It has a similar circuit consisting of an AND gate 64, a flip-flop 65, and an inverter 66 for relaying the signal to the control terminal of the thyristor 42. If AND gate 61 is open, the "+" signal passes through it and sets flip-flop 62, whose set output causes thyristor 41 to conduct. The motor 3 is thus rotated in one direction. As a result, when S ₁ = S ₂ , the “+” signal disappears, so
The flip-flop 62 is reset by the inverted signal from the inverter 63. Thus, the thyristor 41 becomes non-conductive and the motor 3 stops. AND gate 64, flip-flop 65,
Thyristor 4 of "-" signal by inverter 66
The transmission to 2 is also performed in a similar manner. AND gates 61 and 64 have two signal input terminals to control on/off of the gates,
One terminal receives the output of the shift register 67, and the other terminal is an inverter terminal and receives the output of the comparator 68. That is, AND gate 61,6
4, the signal from the shift register 67 and the inverted signal from the comparator 68 are both "1".
If so, the gate will be opened, otherwise the gate will be closed. The shift register 67 has an input terminal connected to the clock pulse generator 69 and (n×2) output terminals connected to the AND gates 61 and 64, and a different output terminal is sequentially output for each clock pulse input. generates a pulse from and after the pulse is output from the last output terminal,
When the next clock pulse is input, a pulse is generated again from the first output terminal. The comparator 68 receives the numerical value M set in the numerical value setter 70 and the relay circuit 6-1,
..., 6-n, and outputs a "1" signal when the number of relaying signals becomes equal to M. Therefore, when the number of relay circuits being relayed is less than M (including 0), the AND gate 6
Since all of the invert terminal inputs of 1 and 64 are "1", the gates are opened every time a pulse input from the shift register 67 is received. Here, since the pulses applied from the shift register 67 to the AND gates 61 and 64 are sequentially output with a clock cycle, the AND gates
Opening operations 1 and 64 are also performed sequentially. Next, when the number of relay circuits being relayed becomes equal to M, the comparator 6
The output of 8 becomes “1” and the AND gate 61, 6
Since the invert input of No. 4 becomes "0", all AND gates 61 and 64 are closed. Therefore,
Thereafter, no matter which relay circuit 6-1, . . . , 6-n the drive signal is input to, it will not be relayed. However, since the flip-flops 62 and 65 of the relay are already set, the drive circuit 4 continues to operate until the drive signal disappears.

The relaying of each relay circuit 6-1, . That is, the common cathodes of diodes 71 and 72 whose anodes are connected to their respective set output terminals are connected to the input terminal of comparator 68.

The operation will be explained below.

Now, let n=10 and M=2. Assume that the temperature in one area rises from a state in which the temperature in all temperature-controlled areas is at the set temperature. In response to this,
Signal from regulator 51 of drive signal generation circuit 5-1
S ₁ changes and S ₁ > S ₂ . As a result, a "+" signal is sent out from the comparator 54 as a drive signal, and is input to the AND gate 61 of the relay circuit 6-1.
At this time, since all the relay circuits 6-1, . . . , 6-n are not relaying the drive signal, the comparator 68 sends out a “0” signal. Therefore, AND gate 61 is opened every time a pulse from shift register 67 is sent. Therefore, when AND gate 61 opens, the "+" signal sets flip-flop 62. The set output of the flip-flop turns on the thyristor 41 of the drive circuit 4-1, and the output of the transformer 2 is supplied to the motor 3-1 to rotate the motor. The motor-operated valve is thus opened, which operates the potentiometer 52 and produces a voltage signal S ₂
increases. When S ₁ =S ₂ in this way, the "+" signal from comparator 54 disappears, so flip-flop 62 is reset by the output of inverter 63. Thus, the thyristor 41 is turned off and the rotation of the motor 3-1 is stopped.

When flip-flop 62 of relay circuit 6-1 is set, an output appears at diode 71, which is input to comparator 68. However, since the number of input signals to the comparator 68 is 1, which is smaller than M=2, the output of the comparator 68 is still "0". During relaying in relay circuit 6-1, that is, motor 3
-1 is in operation, the temperature of the other temperature-controlled areas decreases, the output S ₁ of the regulator of the corresponding drive signal generation circuit 5-2 becomes smaller, and when S ₁ < S ₂ , the comparator 54 outputs " -” signal is sent. As a result, the flip-flop 65 is set in the corresponding relay circuit 6-2, turning on the thyristor 42 of the drive circuit 4-2, thereby rotating the motor 3-2 and moving the electric valve in the direction of closing. The potentiometer is linked to this, and the signal _S2 decreases.

A signal is input to the comparator 68 by setting the flip-flop of the relay circuit 6-2. As a result, the number of input signals to the comparator 68 becomes 2, which is equal to the set value M=2, so the output of the comparator 68 becomes a "1" signal. Therefore, all relay circuits 6-
All AND gates 61, 64 of 1,...,6-n
Since the invert input becomes "0" and is closed, even if a drive signal "+" or "-" is output from the drive signal generation circuit 5 corresponding to another temperature-controlled area, this will be the corresponding one. It is not transmitted to the drive circuit 4. Therefore, the maximum number of actuator motors 3 that can be operated simultaneously is two. Therefore, even though there are 10 actuator motors, the capacity of the transformer 2 and power supply wiring can be reduced to 2 units.
Excessive equipment can be eliminated.

The drive signal whose relay is prohibited is maintained as it is unless the temperature of the corresponding temperature-controlled area changes for other reasons. For example, the drive signal generation circuit 5-
After the drive signal from 1 disappears and the output of comparator 68 becomes "0", it is relayed.

As in this embodiment, if the setting device 70 is provided so that the number of units operating simultaneously can be changed and set as necessary, there is an advantage that the relay control circuit 6 can be applied to air conditioners of various sizes.

As described above, according to the present invention, the capacity of the transformer and wiring equipment can be increased to a much smaller number of controllers even though there are a plurality of controllers, thereby reducing the cost and construction of air conditioners. This brings about the advantages of simplification and improved safety.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram showing a drive control circuit of a conventional electric actuator, Fig. 2 is a block diagram showing the basic configuration of a drive control circuit of an electric actuator according to the present invention, and Fig. 3 shows an embodiment. FIG. 3 is a block circuit diagram. 1...Power supply, 2...Transformer, 3, 3-1,...,
3-n...Motor (operator), 4, 4-1,...,
4-n...drive circuit, 5,5-1,...,5-n...
... Drive signal generation circuit, 6 ... Relay control circuit, 6-
1,...,6-n...Relay circuit, 68...Comparator.

Claims (1)

[Claims] 1. Multiple electric actuators for operating chilled water volume adjustment valves, air dampers, etc. for adjusting the temperature of multiple air-conditioned spaces to their respective set temperatures, and for driving these multiple electric actuators. Generates a drive signal to adjust the opening degree of the corresponding electric actuator according to the common power supply circuit and the set temperature and detected temperature of each of the multiple air-conditioned spaces, and adjusts the opening degree of the electric actuator. An air conditioner comprising a plurality of drive signal generation circuits that stop the drive signals when the desired opening degree is reached, and a drive circuit that connects the power supply circuit to an electric operation device to drive the electric operation device. The drive control circuit of the electric actuator operates upon receiving the drive signal from each of the drive signal generation circuits, supplies a relay signal corresponding to the drive signal to the corresponding drive circuit, and stops the drive signal to stop the operation. a plurality of relay means to be stopped; a means for generating a relay prohibition signal from when the number of circuits of the currently operating relay means reaches a predetermined number until it becomes smaller; and a means for generating a relay prohibition signal in response to the relay prohibition signal. 1. A drive control circuit for an electric actuator in an air conditioner, characterized in that the relay control circuit has means for prohibiting the supply of corresponding drive signals to the plurality of relay means.