JPH0968361A - Control method and control device for absorption type refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate troubles in the operation of an absorption type refrigerating machine due to the abnormality of output from a control device even when there is abnormality in a communication circuit or an external computer and the like by a method wherein operational function is used for external job during a period wherein the operation of an absorption type refrigerating machine is effected while outputting data from an output memory. SOLUTION: When writing from an external computer has not been effected or when the writing has been effected but count by a timer 35 has elapsed a predetermined period of time, data is outputted from an operation result memory 31 so that the operational function of an operation unit 30 is used for the operation of an absorption type refrigerating machine. Further, when the writing has been effected and count by the timer 35 has not elapsed the predetermined period of time, data is outputted from an output memory 33 so that the operational function of the operation unit 30 is used for an external job. Accordingly, a condition that the operation for the operation of the absorption type refrigerating machine is stopped exceeding the predetermined period of time can be prevented whereby troubles in the operation of the absorption type refrigerating machine can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and a control device for an absorption refrigerator.

[0002]

2. Description of the Related Art Conventionally, the control of an absorption chiller has been performed as follows. That is, the control device takes in a detection signal for detecting the operating condition of the absorption chiller, and performs calculation based on this detection signal. Then, the data from the calculation result is output to operate the absorption refrigerator.

However, there are cases where it is desired to use the arithmetic function of the control device of the absorption refrigerator for external work. At that time, first, the external computer operates a specific flag of the control device through the communication line, and by this operation, the above-mentioned calculation for the operation of the absorption chiller is stopped. Then, the write data sent from the external computer via the communication line is written in the output value memory, and the data is output from the output value memory to operate the absorption refrigerator. During,
Use the arithmetic function of the controller for external work.

[0004]

However, when it is desired to use the calculation function of the control unit of the absorption chiller for external work, for example, the calculation for the operation of the absorption chiller is stopped. If an abnormality occurs in the communication line or an external computer while the flag is operated, or if the flag is operated incorrectly, the output may not be normal and the operation of the absorption chiller may be hindered.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to control from a control device even when an abnormality occurs in a communication line or an external computer or when a flag operation is erroneous. An object of the present invention is to provide a control method and apparatus for an absorption refrigerating machine that can suppress the possibility that the output becomes abnormal and the operation of the absorption refrigerating machine is hindered.

[0006]

In order to achieve the above object, the invention of claim 1 performs an operation based on a detection signal for detecting the operating condition of an absorption refrigerator and stores the operation result. Then, the external computer is connected via the communication line and writes the write data sent to the output value memory, outputs the calculation result or the data from the output value memory to operate the absorption refrigerator, and outputs the output value. In a method of controlling an absorption chiller that uses a calculation function for external work while outputting the data from the memory and operating the absorption chiller, if the writing is not performed or the writing is performed. If a predetermined time has passed since
Output the data from the operation result memory to use the operation function for the operation of the absorption chiller, and if the predetermined time does not elapse after the writing, the operation function is used for external work. It is a control method for an absorption chiller characterized by causing data output from an output value memory to be used.

According to a second aspect of the present invention, an input unit for inputting a detection signal for detecting the operating condition of the absorption refrigerator, an arithmetic unit for performing an arithmetic operation based on the input detection signal, and an arithmetic operation of the arithmetic unit. Calculation result memory for storing results, communication port to which an external computer can be connected via a communication line, output value memory for writing write data sent to the communication port, calculation result memory or data from the output value memory Is output to operate the absorption chiller, a timer that starts counting due to the writing, and if the writing is not performed or the writing is performed, When the count exceeds a predetermined time, data is output from the operation result memory, and when the writing is performed and the count does not exceed the predetermined time. The a control apparatus for an absorption refrigerator, characterized in that with a, and switching means for causing the output data from the output value memory.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention is shown in FIGS. In FIG. 1, an outline of an absorption refrigerator type refrigerator will be described. 1 is an evaporative absorber body (lower body),
An evaporator 2 and an absorber 3 are housed in the evaporation absorber body 1. Reference numeral 4 denotes a high temperature regenerator having a gas burner 5, for example, and an absorption liquid pump P, a low temperature heat exchanger 7 and a high temperature regenerator are provided in the middle of the dilute absorption liquid pipe 6 from the absorption liquid reservoir 3A of the absorber 3 to the high temperature regenerator 4. A heat exchanger 8 is provided.

Reference numeral 10 denotes a high-temperature cylinder (upper cylinder), and a low-temperature regenerator 11 and a condenser 12 are housed in the high-temperature cylinder 10. 13 is a refrigerant vapor pipe from the high temperature regenerator 4 to the low temperature regenerator 11, 14 is a heater provided in the low temperature regenerator 11, and 15 is a refrigerant pipe from the heater 14 to the condenser 12. Reference numeral 16 is a refrigerant liquid flow-down pipe from the condenser 12 to the evaporator 2, 17 is a refrigerant circulation pipe connected to the evaporator 2 by piping, 18
Is a refrigerant pump. 20 is an absorber 3 and a condenser 12
Is a cold water pipe connected to. Reference numeral 21 is a cold water pipe connected to the evaporator 2, and 21A is an evaporator heat exchanger. 21B is
A pump for supplying cold water from the cold water pipe 21. The cold water temperature on the outlet side of the cold water pipe 21 is detected by the temperature sensor 21C, and a detection signal is input to the control device 27.

Numerals 22 and 22 are intermediate absorption liquid pipes from the high temperature regenerator 4 to the low temperature regenerator 11 via the high temperature heat exchanger 8.
Reference numerals 23 and 23 denote concentrated absorption liquid pipes that extend from the low temperature regenerator 11 to the absorber 3 via the low temperature heat exchanger 7. In the middle of the fuel supply pipe 24 that supplies fuel to the gas burner 5, the fuel control valve 2
5 is provided, and the valve opening controller 26 controls the valve opening of the fuel control valve 25. Valve opening controller 2
6 is controlled by the data output from the control device 27.

The details of the control device 27 are shown in FIG. 2
Reference numeral 8 is an input unit for inputting a detection signal for detecting the operating condition of the absorption refrigerator. In the above example, the temperature sensor 21
Although the temperature detection signal from C is input, more types of detection signals are actually input. Reference numeral 29 is a data memory that stores the input detection signal. Reference numeral 30 denotes a calculation unit that performs calculation based on the input detection signal. The arithmetic unit 30 has a high-performance arithmetic function and can perform arithmetic operations for various kinds of external work in addition to the arithmetic operations for operating the absorption refrigerator. Reference numeral 31 is a calculation result memory that stores the calculation result of the calculation unit 30.

Reference numeral 32 is a communication port to which an external computer of the external system can be connected via a communication line. The data in the data memory 29 and the data in the operation result memory 31 can be supplied to the external system via the communication port 32. An output value memory 33 writes the write data sent to the communication port 32. An output unit 34 outputs the data from the operation result memory 31 or the output value memory 33 to operate the absorption refrigerator.

Reference numeral 35 is a timer that starts counting when the writing is performed. 36 is a switch for connecting either the calculation result memory 31 or the output value memory 33 to the output unit 34. This switch 36
When the writing has not been performed, or when the writing has been performed but the count has passed a predetermined time, data is output from the operation result memory 31, and the writing is performed and the count is returned. If the predetermined time has not passed, it serves as a switching means for outputting the data from the output value memory.

Next, the operation of this embodiment will be described. During operation of the absorption chiller configured as shown in FIG. 1, the gas burner 5 of the high temperature regenerator 4 burns, for example, a lithium bromide (LiBr) aqueous solution (containing a surfactant) flowing from the absorber 3. The rare absorbent such as is heated, and the refrigerant is separated from the rare absorbent. The refrigerant vapor flows through the refrigerant vapor pipe 13 to the low temperature regenerator 11. Then, the refrigerant liquid obtained by heating and condensing the intermediate absorption liquid from the high temperature regenerator 4 in the low temperature regenerator 11 flows into the condenser 12. In the condenser 12, the refrigerant flowing from the low temperature regenerator 11 is condensed and flows down to the evaporator 2 together with the refrigerant liquid flowing from the low temperature regenerator 11. In the evaporator 2, the refrigerant liquid is sprayed to the evaporator heat exchanger 21A by the operation of the refrigerant pump 18. And the evaporator heat exchanger 21A
The cold water whose temperature has been lowered by being cooled by is supplied to the load.
The refrigerant vapor vaporized in the evaporator 2 flows to the absorber 3 and is absorbed by the dispersed concentrated absorbent.

The intermediate absorption liquid whose concentration is increased by separating the refrigerant vapor in the high temperature regenerator 4 flows to the low temperature regenerator 11 through the high temperature heat exchanger 8 and the intermediate absorption liquid pipe 22. The intermediate absorption liquid is heated by the heater 14 in which the refrigerant vapor from the high temperature regenerator 4 flows. Then, the refrigerant vapor is separated from the intermediate absorption liquid, and the concentration of the absorption liquid is further increased.

The concentrated absorption liquid heated and condensed in the low temperature regenerator 11 flows into the intermediate absorption liquid pipe 23, flows through the low temperature heat exchanger 7 and is spread to the absorber 3. Then, the refrigerant vapor flowing from the evaporator 2 to the absorber 3 is absorbed by the dispersed concentrated absorption liquid. The absorption liquid (rare absorption liquid) whose concentration has been thinned by absorbing the concentrated absorption liquid is sent to the high temperature regenerator 4 by the operation of the absorption liquid pump P.

Then, a detection signal for detecting the operating condition of the absorption refrigerator, for example, a temperature detection signal from the temperature detection sensor 21C or the like is input to the input unit 28 of the fish device. Based on this detection signal, the calculation unit 30 performs a calculation and stores the calculation result in the calculation result memory 31. Data from the calculation result memory 31 is output from the output unit 34 to control, for example, the valve opening controller 26 to control the valve opening of the fuel control valve 25. In practice, not only the valve opening controller 26, but also the valve operating speed of the pump and the valve opening of the absorption liquid pipe and the like are controlled. In this way
Operate the absorption refrigerator.

When it is desired to use the arithmetic function of the arithmetic unit 30 of the control device 27 for external work, the write data sent from the external computer via the communication line is written in the output value memory 33. And this output value memory 3
Output the data from 3 to run the absorption refrigerator,
While outputting the data from the output value memory 33 to operate the absorption chiller, the calculation function is used for external work.
The control procedure in that case is shown in FIG.

In FIG. 3, the timer 35 is reset in the initial state, and the switch 36 enters the A side connecting the calculation result memory 31 to the output section 34 (S1). Then, the detection signals from various sensors are A / D converted, and the data memory 2
9 (S2). A calculation for controlling the absorption refrigerator is performed based on the detection signal. The calculation result is stored in the calculation result memory 31 (S3).

Then, it is judged whether or not the write data sent from the external computer via the communication line is written in the output value memory 33 (S4). If not, the timer is set previously. Then, it is determined whether or not the counting is started (S5). If it is set, it is determined whether or not the count has further passed the predetermined time (S6), and if it has passed, the timer is reset, and the switch 36 connects the operation result memory 31 to the output unit 34. Enter the A side (S7). Then, it is determined whether or not the switch is in the A side (S8),
If it is in the A side, the data of the calculation result memory 31 is output from the output unit 34 (S9). If you are on the B side,
The data in the output value memory 33 is output from the output unit 34 (S11).

If the timer 35 is not set, or if it is set and the predetermined time has not elapsed, it is judged whether or not the switch is in the A side (S8).
If it is in the A side, the data of the calculation result memory 31 is output from the output unit 34 (S9). If you are on the B side,
The data in the output value memory 33 is output from the output unit 34 (S11).

Whether or not the write data sent from the external computer via the communication line is written in the output value memory 33 is determined (S4).
The switch 36 enters the B side connecting the output value memory 33 to the output unit 34 (S10). Then, the data in the output value memory 33 is output from the output unit 34 (S11).

In this way, when the writing from the external computer is not performed (S4), or when the writing is performed but the count has passed a predetermined time (S6), the arithmetic function is absorbed. Data is output from the calculation result memory so as to be used for operating the refrigerator (S7, S8, S9), and the writing is performed (S).
4) When the count does not exceed the predetermined time (S6)
In S8, data is output from the output value memory 33 so that the arithmetic function is used for external work (S8, S).
11) It will be.

[0024]

As described above, according to the first aspect of the present invention, when the writing from the external computer is not performed, or when a predetermined time has elapsed after the writing, the calculation is performed. Output the data from the calculation result memory to use the function for operating the absorption chiller, and use the calculation function for external work if the specified time does not elapse after the writing. To output the data from the output value memory. Therefore,
It is possible to prevent the state in which the calculation for operating the absorption refrigerator is stopped from continuing for a predetermined time or longer. Therefore,
Even if an abnormality occurs in the communication line or an external computer, or if the flag operation is incorrect, the output from the control device may become abnormal and the operation of the absorption chiller may be hindered. Can be deterred.

According to the invention of claim 2, an input section for inputting a detection signal for detecting the operating condition of the absorption chiller, and an operation section for performing an operation based on the input detection signal, An operation result memory that stores the operation result of the operation unit,
A communication port to which an external computer can be connected via a communication line, an output value memory for writing the write data sent to the communication port, and a data output from the operation result memory or the output value memory An output unit for driving, a timer that starts counting when the writing is performed, and when the writing is not performed, or when the writing is performed but the count has passed a predetermined time And a switching means for outputting data from the operation result memory, and outputting the data from the output value memory when the writing is performed and the count does not exceed the predetermined time. , If writing from an external computer has not been performed, or if a predetermined time has elapsed since the writing was performed. , The data is output from the calculation result memory so that the calculation function is used for the operation of the absorption chiller, and if the predetermined time does not elapse after the writing is performed, the calculation function is used for external work. Output data from the output value memory.

Therefore, it is possible to prevent the state in which the calculation for operating the absorption refrigerator is stopped from continuing for a predetermined time. Therefore, even if an abnormality occurs in the communication line or an external computer, or if the flag operation is incorrect, the output from the control device may not be normal and the operation of the absorption chiller may be hindered. Sex can be suppressed.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a detailed view of the control device included in FIG.

FIG. 3 is a control flow chart by the control device of FIG.

[Explanation of symbols]

 28 input section 30 arithmetic section 31 arithmetic result memory 32 communication port 33 output value memory 34 output section 35 timer 36 switch (switching means)

Claims (2)

[Claims] 1. A calculation is performed based on a detection signal for detecting the operating condition of the absorption chiller, and the calculation result is stored,
The external computer is connected via the communication line and writes the write data sent to the output value memory, outputs the calculation result or the data from the output value memory to operate the absorption chiller, and outputs from the output value memory. In the method for controlling an absorption chiller that uses the arithmetic function for external work while the data is output to operate the absorption chiller, if the writing is not performed or the writing is performed. When a predetermined time has passed from the time, the data output from the operation result memory is performed so that the operation function is used for the operation of the absorption chiller, and the predetermined time has not elapsed after the writing. The method for controlling an absorption chiller is characterized in that data is output from the output value memory so that the calculation function is used for external work. 2. An input unit for inputting a detection signal for detecting the operating condition of the absorption refrigerator, an arithmetic unit for performing an arithmetic operation based on the input detection signal, and an arithmetic operation for storing the arithmetic result of the arithmetic unit. Result memory, a communication port to which an external computer can be connected via a communication line, an output value memory for writing the write data sent to the communication port, and output and absorption of data from the operation result memory or output value memory Output unit for operating the refrigerator, a timer that starts counting when the writing is performed, and when the writing is not performed or when the writing is performed but the counting is performed for a predetermined time. When the count has not passed, the data output from the operation result memory is performed, and when the writing is performed and the count does not pass the predetermined time, the output value memory And a switching means for outputting data from the absorption type refrigerator.