JPH11153371A - Device for diagnosing performance of refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To find out the degradation of performance of a refrigerator in early time and maintain it according to schedule. SOLUTION: A refrigerating machine 11 is provided with temperature sensors 13, 14 and 15 which detect temperature at clod water inlet, cold water outlet and cooling water inlet respectively and a micro computer control board 16 to fetech the temperature input signal issed from the temperature sensors 13, 14 and 15. Further, operation data necessary for degradation diagnosis are transmitted from a first communication processor 17 connecting to the board 16 to a remote service center 12 through a communication network 18. A data processor 22 installed in the remote service center 12 diagnoses the degradation of performance according to the data, and if there is any degradation, their results are indicated in a CRT 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator performance diagnostic apparatus which detects deterioration in performance of a refrigerator and outputs an alarm message.

[0002]

2. Description of the Related Art According to the refrigerating machines installed in buildings, factories, etc., performance degradation is judged on the basis of operation data detected by sensors installed at various points in the refrigerating cycle. FIG. 3 is an overall configuration diagram showing a conventional example of such a refrigerator performance diagnosis apparatus, and reference numeral 1 denotes a refrigerator.

In the refrigerator 1, a chilled water inlet temperature sensor 2, a chilled water outlet temperature sensor 3, and a chilled water inlet temperature sensor 4 are mounted, and the temperature input signals from these temperature sensors 2, 3, and 4 are provided. The data is taken into the microcomputer control board 5 as a part of the operation data and is converted into a digital signal value.

[0004] The converted digital signal values are sent to the data display device 6 together with various refrigerator operation data. The local serviceman 7 determines whether or not the performance of the refrigerator has deteriorated by observing the various types of refrigerator operation data displayed on the data display device 6.

[0005]

However, in the refrigerating machine performance judging device having the above configuration, the data display device 6 for displaying the refrigerating machine operation data is installed at the site where the refrigerating machine is installed. In order to detect deterioration early and take prompt action, the serviceman 7 has to frequently visit the installation site of the refrigerator, and there has been a problem that planned maintenance is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a refrigerator performance diagnostic apparatus which can detect performance deterioration of a refrigerator at an early stage and can contribute to planned maintenance of the refrigerator. With the goal.

[0007]

The present invention has the following features to attain the object mentioned above. That is, the invention according to claim 1 is a refrigerator performance diagnostic apparatus for performing a performance diagnosis of a refrigerator provided at a monitored base at a remote service center, wherein the chilled water inlet temperature, the chilled water outlet temperature, And a temperature sensor that detects the cooling water inlet temperature,
A microcomputer control board that captures input signals from the temperature sensors as operation data, and among the operation data captured by the microcomputer control board, selectively selects only operation data when the operation of the refrigerator is in a stable state. A communication processing device for transmitting the data to the remote service center; and a data processing device for evaluating the performance of the refrigerator based on the operation data received from the communication processing device.

[0008] The communication processing device determines that the operating state of the refrigerator is stable when the variation of each value detected by each of the temperature sensors per fixed time is within a certain range. A determination unit, and a data storage unit that stores only the operation data when the operation state is determined to be stable by the determination unit, and stores only the operation data stored in the data storage unit. Preferably, it is configured to communicate with a remote service center.

In such a configuration, a temperature input signal from each temperature sensor is taken into the microcomputer control board as operation data and converted into a digital signal value. Next, these operation data are transmitted to the remote service center by the communication processing device together with other various refrigerator operation data.

In the remote service center, performance values (COP, etc.) of various refrigerators are calculated by the data processing device based on the received operation data, and if the calculated values exceed a certain threshold value, performance degradation will occur. It is determined that this has occurred, and that fact becomes clear.

The operation data transmitted to the remote service center includes a chilled water inlet temperature detected by each temperature sensor, a chilled water outlet temperature, and a variation in the chilled water inlet temperature per fixed time within a certain range. This is operation data in a certain case, that is, when the operation state of the refrigerator is stable.

That is, in order to evaluate the performance of the refrigerator, only the operation data at the time of stability is necessary. According to the above configuration, only the operation data necessary for the performance evaluation is transmitted to the service center. Thus, communication costs can be minimized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a refrigerator performance diagnostic apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is an overall configuration diagram of a refrigerator performance diagnosis apparatus. In FIG. 1, reference numeral 11 denotes a refrigerator, and 12 denotes a remote service center.

The refrigerator 11 includes a chilled water inlet temperature sensor 13 and a chilled water outlet temperature sensor 14 for detecting the temperature of the inlet and outlet of the chilled water for exchanging heat with a load, and a chilled water inlet. Cooling water inlet temperature sensor 15 for detecting the temperature of the
And a microcomputer control board 16 for taking in temperature input signals from 3, 14, and 15 as operation data.

The temperature input signal from each of the temperature sensors 13, 14, 15 is taken into the microcomputer control board 16 as a part of the operation data and is converted into a digital signal. It is sent to the communication processing device (communication processing device) 17. Then, the processing based on the flow shown in FIG. 2 is performed on the operation data sent to the first communication processing device 17.

These processes will be described in the order of flow.
In a process 17a, operation data is periodically collected from the microcomputer control board 16. In a process 17b, the chilled water inlet temperature, the chilled water outlet temperature, and the chilled water inlet temperature detected by the temperature sensors 13, 14, and 15 are determined. The determination unit determines whether or not the operation state of the refrigerator 11 is stable based on.

More specifically, in the process 17b, when the fluctuation amount of each of these detected values within a certain time is within a certain range, it is determined that the operation state of the refrigerator 11 is stable, In addition, when it exceeds the range, it is determined that the operation state of the refrigerator 11 is not stable.

In the process 17c, the determination unit determines whether the refrigerator 11
If it is determined that the operation state of the data storage unit is stable, only the operation data in the stable state is stored in the data storage unit. In the process 17d, the operation data stored in the data storage unit is stored in a dedicated communication protocol. Communication network 18 using
Send to

On the other hand, the second communication processing device 21 installed on the side of the remote service center 12 receives operation data from the first communication processing device 17 via the communication network 18 according to the same dedicated communication protocol. I do. Then, the data processing device 22 extracts the operation data from the second communication processing device 21 and then processes the extracted operation data to calculate various performance values (such as COP).

The calculated performance value is stored in the auxiliary recording device 23. Further, the data processing device 22 determines that the performance of the refrigerator 11 has deteriorated when the calculated performance value exceeds the threshold value input from the input device 24, and displays a warning message on the CRT 25. .

This makes it possible to grasp the performance degradation easily and quickly and take a quick response without frequently visiting the monitored base where the refrigerator 11 is installed, even in a remote place. Planned maintenance of the machine 11 becomes possible.

As described above, in the refrigerator performance diagnosis apparatus according to the present embodiment, the refrigerator 11
The temperature input signals from the temperature sensors 13, 14, 15 are taken into the microcomputer control board 16, and only the operation data necessary for the deterioration diagnosis is transmitted from the first communication processing device 17 to the remote service center 12 via the communication network 18. Sent to.

Then, in the remote service center 12,
Based on the operation data received by the second communication processing device 21, the data processing device 22 determines whether or not the performance of the refrigerator 11 has deteriorated. If performance deterioration has occurred, the fact is displayed on the CRT 25. You.

Therefore, a service person who performs maintenance of the refrigerator 11 can immediately know whether or not the performance has deteriorated without visiting the place where the refrigerator 11 is installed frequently and staying at the remote service center 12. 11
Can be easily maintained.

In order to evaluate the performance of the refrigerator 11,
Only the operation data when the operation state of the refrigerator 11 is stable is necessary. However, in the refrigerator performance diagnosis device of the present embodiment, the internal processing in the first communication processing device 17 (see FIG. 2) is performed. The communication cost is minimized by transmitting only the stable operation data to the service center 12.

Therefore, all the operation data including the case where the operation state is not stable is transferred to the remote service center 12.
Compared to the case where the remote service center 12 selects operation data necessary for diagnosis and performs performance evaluation, it is possible to construct an economical refrigerator performance diagnosis apparatus with extremely low running cost.

[0027]

As is clear from the above description, according to the present invention, the operation data required for the deterioration diagnosis is transmitted from the monitored base where the refrigerator is installed to the remote service center by the communication processing device. Since the presence or absence of performance degradation is determined by the data processing device on the remote service center side, the presence or absence of performance degradation can be immediately known without leaving the remote service center, and planned maintenance of the refrigerator can be easily performed.

Moreover, since only the operation data required for diagnosing the performance deterioration when the refrigerator is stable is transmitted to the remote service center, the communication cost can be minimized and the running cost can be greatly reduced. it can.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a refrigerator performance diagnosis apparatus according to the present invention.

FIG. 2 is a flowchart showing an internal process of a first communication processing device which is a component of the refrigerator performance diagnostic device shown in FIG.

FIG. 3 is an overall configuration diagram showing a conventional example of a refrigerator performance diagnosis device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Refrigerator 12 Remote service center 13 Cold water input temperature sensor 14 Cold water outlet temperature sensor 15 Cooling water outlet temperature sensor 16 Microcomputer control board 17 1st communication processing unit (communication processing unit) 22 Data processing unit

Claims (2)

[Claims] 1. A refrigeration machine performance diagnostic apparatus for diagnosing performance of a refrigerator provided at a monitored base at a remote service center, comprising: a chilled water inlet temperature, a chilled water outlet temperature, and a chilled water inlet temperature of the refrigerator. A microcomputer control board that captures input signals from the respective temperature sensors as operation data, and among the operation data captured by the microcomputer control board,
A communication processing device for selectively transmitting only the operation data when the operation of the refrigerator is in a stable state to the remote service center; and evaluating the performance of the refrigerator based on the operation data received from the communication processing device. A refrigerator performance diagnostic device comprising: a data processing device. 2. The communication processing device determines that the operation state of the refrigerator is stable when a variation amount of each value detected by each of the temperature sensors within a certain time is within a certain range. A determining unit; and a data storage unit that stores only the operating data when the operating state is determined to be stable by the determining unit. The operating unit stores only the operating data stored in the data storing unit. The refrigerator performance diagnostic apparatus according to claim 1, wherein the apparatus is configured to communicate with a remote service center.