JPS629819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides (1) advantages of both remote control and local control in a temperature and humidity control device for an air conditioner, when remote control and air conditioner side local control are performed simultaneously. (2) ensuring a local control function in the event of a remote control device failure; and (3) simplifying the device while achieving the objectives of the above two items, improving operability and reliability as a whole. The aim is to lower prices.

Embodiments of a temperature control device for a conventional air conditioner are shown in FIGS. 1 to 3. Fig. 1 is an electrical circuit diagram of the air conditioner, which includes an air conditioner control panel 38 that includes a temperature detector 37 and a temperature setting device 41 for temperature control, and a temperature control output contact Y-1, air conditioner start/stop. Output contact R-1, status input contact S-1
It is formed of. FIG. 2 shows the input/output connections between the central control unit 56 and the above-mentioned status input contact S-2. 44 is a slave unit of a signal converter that switches input/output signals and digitizes the signal from the temperature detector 37. FIG. 3 shows a block diagram of the central control unit. Reference numeral 45 is a master unit of a signal converter for converting a transmission signal into an input signal to the central device, or converting an output signal from the central control device into a transmission signal for transmission. One of the conventional embodiments will be explained with reference to FIGS. 1 to 3 above. Temperature detector 37
The temperature state detected by the temperature signal is
The set values by the temperature setter 41 are output as temperature setting signals to the central control device. The calculation unit 54 determines the priority between the air conditioner side temperature setter 41 set value and the central controller setter 52 set value, and compares the set value with the detected temperature value, and outputs the temperature control output. (In this case, a compressor start/stop output signal) is output from 47 to the air conditioner control panel.

A relay 42 for starting and stopping the compressor is installed in the air conditioning control panel to control the temperature. In this conventional example,
The signals required for temperature control are a temperature signal, a temperature setting signal, and a temperature control signal (in this case, a compressor start/stop signal), but the higher the number of signals, especially the number of analog signals, the more expensive the entire device becomes. Therefore, especially when signal transmission is performed using a multiplex signal transmission system, the above points have been a cause of a large price increase. In addition, this conventional example requires an arithmetic circuit to determine the priority of temperature set values and to compare the temperature set values with the detected temperature values, but in this way the control functions are consolidated in the central control unit. Therefore, if the central control unit malfunctions, there is a risk that all air conditioners will be unable to control the temperature, which poses a reliability problem, and control functions, especially the setting value priority determination function, Therefore, it is difficult to determine individual priorities or change priorities, such as giving priority to some air conditioners and giving priority to the central controller, for example.
There were many operational inconveniences.

The present invention overcomes the above-mentioned conventional drawbacks.

Embodiments of the present invention will be described below based on FIGS. 4 to 7.

FIG. 4 shows an example of incorporating the temperature control device according to the present invention. 1 is an air conditioner operation switch, 2 is an auxiliary relay for status detection, 3 is a blower on/off relay, 4 is a compressor on/off relay, 5 is an auxiliary relay, 6 is a four-way valve switching relay, and 7 is a temperature switch according to the present invention. Control device 7' indicates contacts that are opened and closed by temperature control signals. FIG. 5 is an example of the internal basic circuit of the temperature control device. 8 is a resistance value detection type temperature sensor, 9 is a temperature setting device using a variable resistor, 10 is a comparator, 11 is an AND circuit for external interrupt control input processing, 12 is a reference potential line, 13 is a temperature signal output, 1
4 is an external interrupt control input. 15 is an OR circuit for external interrupt control input processing. Figure 5a
5 is an example in which an OR circuit is used for external interrupt control input processing, and FIG. 5b is an example in which an AND circuit is used in external interrupt control input processing. As shown in FIG. 4, the signals required for temperature control from a remote location are a temperature output signal and an interrupt control input. An example of a block diagram of the central control device in this case is shown in FIG.

An outline of its operation will be explained below. The temperature state detected by the temperature sensor 8 is compared with the set value of the temperature setting device 9 by a comparator 10, and outputted to an OR circuit 15 or an AND circuit 11. On the other hand, the temperature signal is output as a potential difference signal between 12 and 13, and is sent to the central controller through signal converters 18 and 20. The temperature signal is obtained by combining the temperature setting value of the temperature setting device 26 provided in the central control device and the calculation unit 2.
8 and sent as a temperature control output (compressor start/stop output in this example) to the external interrupt control input 14 of the temperature control device 7 according to the invention through signal converters 18, 20. The temperature control output compared by the comparator 10 and the temperature control output inputted from the central control unit through the external interrupt control input 14 are processed by the AND circuit 11 or the OR circuit 15 and sent to the contact 7 via the drive circuit. ′ opens and closes.
Here, if the circuit shown in FIG. 5a is used as the temperature control device, if any input is H, the output from 15 will be H. In other words, the compressor operates. In other words, it becomes an operation priority circuit, and for cooling, temperature setting device 2
The temperature will be controlled according to the value set to the lower temperature among 6 and 9, and during heating, the temperature will be set to a higher temperature by inverting the signals of the comparator 10 and the external control input 14. The temperature is controlled according to the set value.

On the other hand, when using the circuit shown in Fig. 5b, the compressor operates only when both inputs are H, so it becomes a stop priority circuit, and during cooling, it follows the value set to a high temperature. During heating, the temperature is controlled according to a lower temperature value.

In the above embodiment, the temperature control device was described, but if 8 is a humidity sensor, 9 and 26 are humidity setting devices, and the same function can be obtained by connecting the outputs from 11 and 15 to the humidifier start/stop relay. It will be done.

As is clear from the above explanation, the analog signal is only a temperature signal, the temperature sensor is used for both local control and central control on the air conditioner side, and the central control device and air conditioner temperature control device Since priority determination is made using a simple AND or OR circuit, the arithmetic section of the central control unit can be simplified, and the cost of the entire device can be reduced. By using an AND circuit for interrupt input processing, for example, by using the temperature setting value of the central control unit as the allowable lower limit temperature for cooling during cooling and as the upper limit allowable heating temperature during heating, it is possible to eliminate waste. By using the OR circuit for interrupt input processing, for example, the setting value of the central control unit can be set as the upper limit temperature for cooling and the lower limit temperature for heating, and can be set to the individual setting device. We were able to dramatically improve operability by preventing extreme temperature settings due to incorrect operation.

Furthermore, if the external interrupt input signal is fixed to H for the AND circuit and L for the OR circuit, complete local control becomes possible.
Even in the event of a failure of the central control device, the temperature control of the air conditioner can be performed on the air conditioner side, making it possible to improve the reliability and safety of the entire device.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of a conventional air conditioner, Figure 2
The figure is an input/output connection diagram between the air conditioner and the central control device, FIG. 3 is a block diagram of the central control device, FIG. 4 is a connection diagram between the air conditioner and the temperature control device according to the present invention, and FIG. Figures a and b are explanatory diagrams of the internal basic circuit of the temperature control device in the present invention, Figure 6 is an input/output connection diagram between an air conditioner using the temperature control device in the present invention and the central control unit, and Figure 7 is FIG. 2 is a block diagram of a central control device when the temperature control device of the present invention is used. 8... Temperature or humidity detection unit, 9... Temperature or humidity setting unit, 11... AND circuit, 13... Temperature or humidity signal output unit, 14... External control input unit, 15... Logic sum circuit.

Claims (1)

[Claims] 1. A temperature or humidity detection unit, a temperature or humidity setting unit, a control output unit that outputs a control signal to the outside, a signal output unit that outputs the temperature signal detected by the detection unit, and an external interrupt control unit. an external control input section for inputting a signal, a comparison means for comparing the signal of the detection section and the signal of the setting section, and the output of the detection section can be outputted to the outside via the signal output section. and the temperature or humidity of the air conditioner configured to input the output of the comparing means and the interrupt control signal from the external control input section to the control output section via a logical sum or AND circuit. Control device.