Diagnostic device, diagnostic system, diagnostic method, and program

Abstract

According to the present invention, included are: a measurement value acquisition unit (110) that acquires a measurement value for each of a plurality of measurement items measured by one or a plurality of measuring instruments that measure the plurality of measurement items with regard to an electric deionized water producing device; a calculating unit (120) that calculates an individual predicted life expectancy on the basis of each of the measurement values acquired by the measurement value acquisition unit (110); a predicting unit (130) that predicts a shortest predicted life expectancy of a plurality of the individual predicted life expectancies calculated by the calculating unit (120) as being a predicted life expectancy of the electric deionized water producing device; and an output unit (140) that outputs information in accordance with the predicted life expectancy predicted by the predicting unit 130.

Description

[Technical Field]

[0001] The present invention relates to a diagnostic device, a diagnostic system, a diagnostic method, and a program. [Background technology]

[0002] Water treatment devices for improving water quality require replacement after a set period of use. For example, a device has been developed that predicts the end of the life of a water purification cartridge based on the amount of water passing through the cartridge per unit time, and transmits a life signal before the end of the life (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-202286 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned technology, the only measurement item used to calculate the lifespan of a water treatment device is the water flow rate. Therefore, if the measured water flow rate changes for some reason, the predicted end of life will be later than the actual time when replacement is required. In this case, the water treatment device that needs replacement will continue to be used. As a result, water of the desired quality will not be obtained. As a result, there is a risk that the accurate replacement time will not be presented.

[0005] An object of the present invention is to provide a diagnostic device, a diagnostic system, a diagnostic method, and a program that can indicate a more accurate replacement time. [Means for solving the problem]

[0006] The diagnostic device of the present invention comprises: A diagnostic device for diagnosing an electrodeionized water production device, comprising: a measurement value acquisition unit that acquires measurement values ​​for each of a plurality of measurement items measured by one or a plurality of measuring devices for the electrodeionized water production apparatus; a calculation unit that calculates an individual predicted lifespan based on each of the measurement values ​​acquired by the measurement value acquisition unit; a prediction unit that predicts the shortest individual predicted lifespan of the plurality of individual predicted lifespans calculated by the calculation unit as the predicted lifespan of the electrodeionization water production apparatus; and an output unit that outputs information corresponding to the predicted lifespan predicted by the prediction unit.

[0007] In addition, the diagnostic system of the present invention comprises: an electrodeionized water production device; one or more measuring devices for measuring a plurality of measurement items for the electrodeionized water production apparatus; a diagnostic device; The diagnostic device comprises: a measurement value acquisition unit that acquires the measurement values ​​measured by the measuring device; a calculation unit that calculates an individual predicted lifespan based on each of the measurement values ​​acquired by the measurement value acquisition unit; a prediction unit that predicts the shortest individual predicted lifespan of the plurality of individual predicted lifespans calculated by the calculation unit as the predicted lifespan of the electrodeionization water production apparatus; and an output unit that outputs information corresponding to the predicted lifespan predicted by the prediction unit.

[0008] In addition, the diagnostic method of the present invention includes: 1. A diagnostic method for diagnosing an electrodeionization water production apparatus, comprising: a process of acquiring measurement values ​​measured by one or more measuring devices for each of a plurality of measurement items for the electrodeionized water production apparatus; calculating an individual predicted lifespan based on each of the acquired measurements; a process of predicting the shortest individual predicted lifespan among the calculated plurality of individual predicted lifespans as the predicted lifespan of the electrodeionization water production apparatus; and displaying information corresponding to the predicted lifespan on a display unit.

[0009] The program of the present invention also includes: On the computer, a step of acquiring measurement values ​​measured by one or more measuring devices for each of a plurality of measurement items for the electrodeionization water production device; calculating an individual predicted lifespan based on each of the acquired measurements; predicting the shortest individual predicted lifespan among the calculated plurality of individual predicted lifespans as the predicted lifespan of the electrodeionization water production apparatus; and a procedure for displaying information corresponding to the predicted lifespan on a display unit. [Effects of the Invention]

[0010] In the present invention, it is possible to provide a more accurate replacement time. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating a first embodiment of a diagnostic system according to the present invention. [Figure 2] FIG. 2 is a diagram showing an example of components included in the diagnostic device shown in FIG. 1. [Figure 3] 3 is a diagram showing an example of an individual predicted life span for each measurement item calculated by the calculation unit shown in FIG. 2. FIG. [Figure 4] 3 is a diagram showing an example of a display mode in which the output unit shown in FIG. 2 displays information according to the predicted lifespan. FIG. [Figure 5] 10 is a diagram showing another example of a display mode in which the output unit shown in FIG. 2 displays information according to the predicted lifespan. FIG. [Figure 6] 2 is a flowchart illustrating an example of a diagnostic method for an electrodeionized water production apparatus in the diagnostic device shown in FIG. 1. [Figure 7] FIG. 10 is a diagram illustrating a second embodiment of a diagnostic system according to the present invention. [Figure 8]FIG. 8 is a diagram showing an example of components included in the diagnostic device shown in FIG. 7. [Figure 9] 10 is a graph showing an example of changes in measured values ​​with respect to driving time for two measurement items. [Figure 10] 8 is a flowchart illustrating an example of a method for diagnosing an electrodeionized water production apparatus using the diagnostic device shown in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (First embodiment)

[0013] FIG. 1 is a diagram showing a first embodiment of a diagnostic system of the present invention. As shown in FIG. 1, the diagnostic system of this embodiment includes a diagnostic device 100, an electrodeionized water production device 200, and a measuring device 300. Diagnostic device 100 and measuring device 300 are communicatively connected via a communication network 400. Communication network 400 may be the general Internet. Alternatively, communication network 400 may be a communication network closed to a specific location, such as an in-house network. Alternatively, diagnostic device 100 and measuring device 300 may be directly connected.

[0014] The electrodeionized water production apparatus 200 is an apparatus (EDI) that produces pure water by using electrical power to move ions contained in water that has been treated using a reverse osmosis membrane or the like. The electrodeionized water production apparatus 200 may be any apparatus commonly used in processes for producing pure water.

[0015] Measuring device 300 simultaneously measures multiple measurement items for electrodeionized water production apparatus 200. For example, measuring device 300 measures at least two of the multiple measurement items: the accumulated amount of current supplied to electrodeionized water production apparatus 200, the differential pressure of water passing through electrodeionized water production apparatus 200, the voltage applied to electrodes provided in electrodeionized water production apparatus 200, the quality of treated water passed through electrodeionized water production apparatus 200, the accumulated load of water to be treated passed through electrodeionized water production apparatus 200, and the accumulated amount of water passed through electrodeionized water production apparatus 200. Measuring device 300 transmits the measured values ​​to diagnostic device 100. Measuring device 300 transmits identification information that can identify measuring device 300 along with the measured values. Note that, as long as the electrodeionized water production apparatus 200 to be measured by the measuring device 300 can be identified, identification information that can identify the electrodeionized water production apparatus 200 that is the measurement target may be transmitted along with the measurement value. Furthermore, the measuring device 300 transmits the measurement value together with date information indicating the measurement date and time of the transmitted measurement value. A single measuring device 300 may measure multiple measurement items. Alternatively, multiple measuring devices corresponding to each of the multiple measurement items may measure each of the multiple measurement items. Note that the number of measuring devices 300 may be one or more. When multiple measuring devices 300 are provided, each measuring device may measure all or some of the multiple measurement items, or each measuring device may measure the measurement items assigned to it.

[0016] Diagnostic device 100 acquires the measurement values ​​transmitted from measuring device 300. Diagnostic device 100 assesses the lifespan of electrodeionized water production apparatus 200 based on the acquired measurement values. FIG. 2 is a diagram showing an example of components included in diagnostic device 100 shown in FIG. 1. As shown in FIG. 2, diagnostic device 100 shown in FIG. 1 has a measurement value acquisition unit 110, a calculation unit 120, a prediction unit 130, and an output unit 140. Note that FIG. 2 shows only the main components related to this embodiment among the components included in diagnostic device 100 shown in FIG. 1.

[0017] The measurement value acquiring section 110 acquires the measurement values ​​for each of the multiple measurement items transmitted from the measuring device 300. The measurement value acquiring section 110 may acquire the measurement values ​​by issuing a measurement value acquisition request to the measuring device 300.

[0018] The calculation unit 120 calculates the individual predicted lifespan based on each measurement value acquired by the measurement acquisition unit 110. The calculation unit 120 stores in advance a correspondence between the measurement value and the individual predicted lifespan for each of a plurality of measurement items. The calculation unit 120 may acquire the individual predicted lifespan associated with the measurement value acquired by the measurement acquisition unit 110. The calculation unit 120 may also calculate the individual predicted lifespan from the measurement value acquired by the measurement acquisition unit 110 using an actual value of the relationship between a measurement value measured in the past and the lifespan. This calculation method is not particularly specified. The calculation unit 120 outputs the calculated individual predicted lifespan to the prediction unit 130. At this time, the calculation unit 120 may also output the measurement item for which the individual predicted lifespan was calculated to the prediction unit 130 together with the individual predicted lifespan.

[0019] It has been reported that the catalytic coating layer of oxide-coated electrodes peels off when current is continuously applied. Consumption of the catalytic layer can suddenly cause a voltage rise, potentially rendering the device inoperable. Therefore, the calculation unit 120 uses the accumulated current flow as a measurement parameter to calculate the individual predicted lifespan. Furthermore, the inflow of oxidizers or foreign matter into the electrodeionization water production system 200 can impair water flow, resulting in an increase in the differential pressure. An increase in the differential pressure can lead to a decrease in the quality and volume of treated water. Higher internal pressure also increases the risk of water leakage. Therefore, the calculation unit 120 uses the differential pressure as a measurement parameter to calculate the individual predicted lifespan. Furthermore, the voltage across the electrodes increases due to factors such as damage to the ion exchanger caused by current, electrode plates (peeling of the catalytic layer), and scale formation (depending on the quality and operating conditions of the water being treated and supplied to the electrodeionization water production system 200). If the voltage across the electrodes increases and exceeds the capacity of the DC power supply, the current value decreases, resulting in a decrease in the quality of the treated water. Therefore, the voltage applied to the electrodes is used as a measurement parameter for the calculation unit 120 to calculate the individual predicted life span. Furthermore, components that are difficult to ion exchange may accumulate inside the electrodeionization water production apparatus 200 after long-term operation. Examples of such components include polyvalent metal ions, such as hardness components, which are present at a certain percentage in RO (reverse osmosis) permeate water. Many of these components have high selectivity coefficients for ion exchange resins. The amount of these components accumulated is referred to as the accumulated amount. The accumulated load, calculated based on the conductivity, flow rate, and various ion concentrations, can be used as an indicator for determining the accumulated amount. A large accumulated load may result in a deterioration in the quality of the treated water, an increase in voltage, a differential pressure, and other factors. Therefore, the accumulated load of the water being treated that flows through the electrodeionization water production apparatus 200 is used as a measurement parameter for the calculation unit 120 to calculate the individual predicted life span.

[0020] Prediction unit 130 predicts the shortest individual predicted lifespan as the predicted lifespan among the multiple individual predicted lifespans calculated by calculation unit 120. It goes without saying that the individual predicted lifespans that are compared for long and short are individual predicted lifespans that correspond to measurement values ​​measured by measuring device 300 for multiple measurement items at the same time.

[0021] 3 is a diagram showing an example of the individual predicted lifespans for each measurement item calculated by calculation unit 120 shown in FIG. Prediction unit 130 refers to the results of calculation of the individual predicted lifespans by calculation unit 120 for each measurement item as shown in FIG. 3, and predicts the shortest individual predicted lifespan as the predicted lifespan. In the example shown in FIG. 3, the measurement item "water quality" has the shortest individual predicted lifespan of "10 months," so prediction unit 130 predicts "10 months" as the predicted lifespan of electrodeionized water production apparatus 200, which is the measurement target.

[0022] The prediction unit 130 may predict the expected lifespan of either the electrodeionized water production apparatus 200, whichever is shorter: a period (hereinafter referred to as the remaining usable lifespan) obtained by subtracting the period from the start of operation of the electrodeionized water production apparatus 200 until the measuring device 300 measures multiple measurement items from the usable lifespan preset for the electrodeionized water production apparatus 200, or the shortest individual predicted lifespan described above. Note that the operating time (the period from the start of operation of the electrodeionized water production apparatus 200 until the measuring device 300 measures multiple measurement items) can be calculated (predicted) from the cumulative amount of water passed through the electrodeionized water production apparatus 200. Therefore, the prediction unit 130 may calculate (predict) the expected lifespan based on the cumulative amount of water passed through the electrodeionized water production apparatus 200. This expected lifespan can be used as a numerical value indicating the degree of deterioration over time of the components constituting the electrodeionized water production apparatus 200. In other words, by using the remaining usable life, it is possible to take into account the lifespan of the components that make up the electrodeionized water production apparatus 200 in accordance with their deterioration over time. For example, plastics used as components of the electrodeionized water production apparatus 200 deteriorate due to ultraviolet rays and the like with use, and their strength decreases.

[0023] The output unit 140 outputs information corresponding to the predicted lifespan predicted by the prediction unit 130. The output unit 140 may output the result of comparing the predicted lifespan predicted by the prediction unit 130 with a preset threshold. The output unit 140 may output the predicted lifespan predicted by the prediction unit 130. The output unit 140 may also output the time (for example, year, month, and day) when the predicted lifespan will arrive based on the predicted lifespan predicted by the prediction unit 130. The output mode of the information corresponding to the predicted lifespan by the output unit 140 may be to display the information, light up a lamp corresponding to the information, print the information, output the information as an audio message, or transmit the information to another device.

[0024] 4 is a diagram showing an example of a display mode in which the output unit 140 shown in FIG. 2 displays information corresponding to the predicted lifespan. As shown in FIG. 4, the output unit 140 shown in FIG. 2 may display rank information of the degradation state corresponding to the predicted lifespan predicted by the prediction unit 130. The rank of the degradation state may be determined by the output unit 140 comparing the predicted lifespan predicted by the prediction unit 130 with a plurality of thresholds, and may correspond to the comparison result. For example, if the predicted lifespan is longer than threshold A, the output unit 140 may rank the degradation state as A; if the predicted lifespan is equal to or shorter than threshold A and longer than threshold B which is shorter than threshold A, the output unit 140 may rank the degradation state as B; and if the predicted lifespan is equal to or shorter than threshold B, the output unit 140 may rank the degradation state as C.

[0025] Fig. 5 is a diagram showing another example of a display mode in which information according to the predicted lifespan is displayed by the output unit 140 shown in Fig. 2. As shown in Fig. 5, the output unit 140 shown in Fig. 2 may display the predicted lifespan itself predicted by the prediction unit 130.

[0026] A method for diagnosing electrodeionized water production apparatus 200 in diagnostic device 100 shown in Fig. 1 will be described below. Fig. 6 is a flowchart for explaining an example of a method for diagnosing electrodeionized water production apparatus 200 in diagnostic device 100 shown in Fig. 1. Here, an example will be described in which output unit 140 displays deterioration information of electrodeionized water production apparatus 200 as a rank.

[0027] When operation using electrodeionized water production apparatus 200 begins and measurement values ​​for multiple measurement items measured by measuring device 300 are transmitted to diagnostic device 100 at a predetermined timing, measurement value acquisition unit 110 acquires the transmitted multiple measurement values ​​(step S1). Next, calculation unit 120 calculates individual predicted lifespans based on each of the measurement values ​​acquired by measurement value acquisition unit 110 (step S2). The method for calculating the individual predicted lifespans is as described above. Then, prediction unit 130 predicts the shortest individual predicted lifespan of the multiple individual predicted lifespans calculated by calculation unit 120 as the predicted lifespan (step S3).

[0028] The output unit 140 compares the predicted lifespan predicted by the prediction unit 130 with a threshold value and determines a rank as deterioration information for the electrodeionized water production apparatus 200 based on the magnitude relationship between the predicted lifespan and the threshold value (step S4). The rank may be determined by the method described above. The output unit 140 then displays the determined rank information (step S5).

[0029] As described above, in this embodiment, the measuring device 300 measures multiple measurement items for the electrodeionized water production apparatus 200. The diagnostic device 100 calculates an individual predicted lifespan based on each of the multiple measured values. The diagnostic device 100 then predicts the shortest individual predicted lifespan among the calculated individual predicted lifespans as the predicted lifespan. This makes it possible to present a more accurate replacement time for the electrodeionized water production apparatus 200. It is also possible to present the replacement time for each electrodeionized water production apparatus 200 currently in operation. Furthermore, the supply schedule for the electrodeionized water production apparatus 200 can be easily managed. (Second embodiment)

[0030] Fig. 7 is a diagram showing a second embodiment of the diagnostic system of the present invention. As shown in Fig. 7, the diagnostic system in this embodiment includes a diagnostic device 101, an electrodeionized water production apparatus 200, and a measuring device 300. The diagnostic device 101 and the measuring device 300 are communicably connected via a communication network 400. The electrodeionized water production apparatus 200, the measuring device 300, and the communication network 400 are the same as those in the first embodiment. Alternatively, the diagnostic device 101 and the measuring device 300 may be directly connected.

[0031] Diagnostic device 101 acquires the measurement values ​​transmitted from measuring device 300. Diagnostic device 101 assesses the lifespan of electrodeionized water production apparatus 200 based on the acquired measurement values. FIG. 8 is a diagram illustrating an example of components included in diagnostic device 101 shown in FIG. 7. As shown in FIG. 8, diagnostic device 101 shown in FIG. 1 has measurement value acquisition unit 110, calculation unit 121, prediction unit 130, and output unit 140. Measurement value acquisition unit 110, prediction unit 130, and output unit 140 are the same as those in the first embodiment. Note that FIG. 8 illustrates only the main components related to this embodiment among the components included in diagnostic device 101 shown in FIG. 7.

[0032] The calculation unit 121 calculates an individual predicted lifespan based on each measurement value acquired by the measurement value acquisition unit 110. The calculation unit 121 calculates the individual predicted lifespan based on the rate of change over time of a first measurement value, which is the most recent measurement of each of a plurality of measurement items, from a second measurement value, which is measured immediately before the first measurement value, and the first measurement value. That is, the calculation unit 121 calculates the individual predicted lifespan based on the slope over time from the second measurement value to the first measurement value and the first measurement value. Here, "most recent" refers to a timing that precedes the timing at which the calculation unit 121 calculates the slope, and is the closest timing among the timings at which the measurement value acquisition unit 110 acquires the measurement values ​​to the timing at which the calculation unit 121 calculates the slope. Furthermore, "just before" refers to a timing that precedes the first measurement value used by the calculation unit 121 to calculate the slope, and is the closest timing among the timings at which the measurement value acquisition unit 110 acquires the measurement values ​​to the timing at which the measurement value acquisition unit 110 acquires the first measurement value. The time interval between the timings at which two measurement values ​​are measured, which the calculation unit 121 uses when calculating the slope of the measurement value per unit time during measurement, may be other than those described above and is not particularly limited. For example, the calculation unit 121 may calculate the rate of change over time using two measurement values ​​acquired by the measurement value acquisition unit 110 at different timings for each of multiple measurement items, and calculate the individual predicted lifespan based on the calculated rate of change (the same applies to the following explanation). Furthermore, the timing may be, for example, a predetermined period from the measurement timing of the first measurement value to the measurement timing of the second measurement value. The relationship between the slope (change in the measurement value per unit time) and the predicted lifespan differs depending on the measurement item. Therefore, the calculation unit 121 calculates the individual predicted lifespan from the measurement values ​​acquired by the measurement value acquisition unit 110 and their slopes using the relationship between the slopes and lifespans measured in the past for each measurement item. The calculation unit 121 outputs the calculated individual predicted lifespan to the prediction unit 130. At this time, the calculation unit 121 may also output the measurement items for which the individual predicted lifespans have been calculated to the prediction unit 130 together with the individual predicted lifespans.

[0033] 9 is a graph showing an example of changes in measured values ​​with respect to operating time for two measurement items. As shown in FIG. 9, the point at which the measured values ​​reach their upper limit, i.e., the point at which it is predicted that electrodeionized water production apparatus 200 has reached the end of its life, varies not only with the measured values ​​at the time of measurement but also with the measurement items (measurement items A and B shown in FIG. 9) and often also with the change (slope) in the measured values ​​per unit time at the time of measurement. Therefore, in this embodiment, calculation unit 121 uses the relationship between the previously measured slope and life for each measurement item to calculate an individual predicted life from the measured values ​​acquired by measurement acquisition unit 110 and their slopes.

[0034] The calculation unit 121 calculates a lifespan according to the calculated value for each measurement item. The calculation unit 121 may calculate an individual predicted lifespan based on the calculated lifespan and the rate of change (slope) of the lifespan over time. Specifically, the calculation unit 121 calculates an individual predicted lifespan (first lifespan) for each measurement item according to the most recently measured first measurement value. The calculation unit 121 calculates an individual predicted lifespan (second lifespan) according to the second measurement value measured immediately before the first measurement value. The calculation unit 121 calculates the rate of change (slope) from the second lifespan to the first lifespan with respect to the time from the measurement date and time of the second measurement value to the measurement date and time of the first measurement. The calculation unit 121 calculates the individual predicted lifespan based on the calculated slope and the first lifespan. The method of calculating the individual predicted lifespan from each measurement value may be the same as that used in the first embodiment.

[0035] A method for diagnosing electrodeionized water production apparatus 200 in diagnostic device 101 shown in Fig. 7 will be described below. Fig. 10 is a flowchart for explaining an example of a method for diagnosing electrodeionized water production apparatus 200 in diagnostic device 101 shown in Fig. 7. Here, an example will be described in which output unit 140 displays deterioration information of electrodeionized water production apparatus 200 as a rank.

[0036] When operation using electrodeionized water production apparatus 200 begins and measuring device 300 transmits measurement values ​​for multiple measurement items to diagnostic device 101 at a predetermined timing, measurement value acquisition unit 110 acquires the transmitted measurement values ​​(step S11). Next, calculation unit 121 calculates the rate of change over time of a first measurement value most recently acquired by measurement value acquisition unit 110 from a second measurement value acquired by measurement value acquisition unit 110 immediately before the first measurement value, i.e., the slope of the measurement value per unit time at the time of measurement (step S12). Then, calculation unit 121 calculates an individual predicted lifespan based on the measurement value and the slope for the measurement item (step S13). Then, prediction unit 130 predicts the shortest individual predicted lifespan of the multiple individual predicted lifespans calculated by calculation unit 121 as the predicted lifespan (step S14).

[0037] The output unit 140 compares the predicted lifespan predicted by the prediction unit 130 with a threshold value and determines a rank as deterioration information for the electrodeionized water production apparatus 200 based on the magnitude relationship between the predicted lifespan and the threshold value (step S15). The rank may be determined by the method described above. The output unit 140 then displays the determined rank information (step S16).

[0038] As described above, in this embodiment, the measuring device 300 measures multiple measurement items for the electrodeionized water production apparatus 200. The diagnostic device 101 calculates an individual predicted lifespan based on each of the multiple measured values. The diagnostic device 101 then predicts the shortest individual predicted lifespan among the calculated individual predicted lifespans as the predicted lifespan. When calculating the individual predicted lifespans, the calculation unit 121 calculates the individual predicted lifespans using the rate (slope) of change of the measured value per unit time. This makes it possible to present a more accurate replacement time for the electrodeionized water production apparatus 200. It also makes it possible to present the replacement time for each electrodeionized water production apparatus 200 currently in operation. Furthermore, it is possible to easily manage the supply schedule for the electrodeionized water production apparatus 200.

[0039] Although the above description has been given by allocating each function (process) to each component, this allocation is not limited to the above. Furthermore, the configuration of the components is also not limited to the above-described embodiments, which are merely examples. Furthermore, each embodiment may be combined.

[0040] The processes performed by diagnostic devices 100 and 101 may be performed by logic circuits individually designed for each purpose. Alternatively, a computer program (hereinafter referred to as a program) describing the process procedures may be recorded on a recording medium readable by diagnostic devices 100 and 101, and the program recorded on the recording medium may be read and executed by diagnostic devices 100 and 101. Examples of recording media readable by diagnostic devices 100 and 101 include removable recording media such as magneto-optical disks, DVDs (Digital Versatile Discs), CDs (Compact Discs), Blu-ray (registered trademark) Discs, and USB (Universal Serial Bus) memories, as well as memories such as ROMs (Read Only Memory), RAMs (Random Access Memory), HDDs (Hard Disc Drives), and SSDs (Solid State Drives) built into diagnostic devices 100 and 101. The programs recorded on the recording media are read by a CPU provided in each diagnostic device 100 and 101, and the same processes as those described above are performed under the control of the CPU. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

[0041] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

[0042] This application claims priority based on Japanese Patent Application No. 2022-071416, filed on April 25, 2022, the disclosure of which is incorporated herein in its entirety.

Claims

1. A diagnostic device for diagnosing an electrodeionized water production device, comprising: a measurement value acquiring unit that acquires measurement values ​​for each of a plurality of measurement items measured by one or a plurality of measuring devices for the electrodeionized water production apparatus; a calculation unit that calculates an individual predicted lifespan based on each of the measurement values ​​acquired by the measurement value acquisition unit; a prediction unit that predicts the shortest individual predicted lifespan of the plurality of individual predicted lifespans calculated by the calculation unit as the predicted lifespan of the electrodeionization water production apparatus; an output unit that outputs information according to the predicted lifespan predicted by the prediction unit; The calculation unit calculates the individual predicted lifespan based on a rate of change over time of measured values ​​for at least two of the plurality of measurement items.

2. 2. The diagnostic device according to claim 1, The prediction unit is a diagnostic device that predicts the predicted lifespan as the shorter of the period obtained by subtracting the period from the start of operation of the electrical deionized water production device to the time when the measuring device measures the multiple measurement items from the usable lifespan of the electrical deionized water production device, or the shortest individual predicted lifespan.

3. 3. The diagnostic device according to claim 1 or 2, The measurement value acquisition unit is a diagnostic device that acquires measurement values ​​measured by the measuring device for at least two of the multiple measurement items: the accumulated amount of electricity passing through the electrical deionized water production apparatus, the differential pressure of the water passing through the electrical deionized water production apparatus, the voltage applied to electrodes provided in the electrical deionized water production apparatus, the water quality of the treated water that has passed through the electrical deionized water production apparatus, the accumulated load amount of water to be treated that is passed through the electrical deionized water production apparatus, and the accumulated amount of water that has passed through the electrical deionized water production apparatus.

4. 3. The diagnostic device according to claim 1 or 2, The output unit is a diagnostic device that outputs a result of comparing the predicted lifespan with a threshold value.

5. an electrodeionized water production device; one or more measuring devices for measuring a plurality of measurement items for the electrodeionized water production apparatus; a diagnostic device; The diagnostic device comprises: a measurement value acquisition unit that acquires the measurement values ​​measured by the measuring device; a calculation unit that calculates an individual predicted lifespan based on each of the measurement values ​​acquired by the measurement value acquisition unit; a prediction unit that predicts the shortest individual predicted lifespan of the plurality of individual predicted lifespans calculated by the calculation unit as the predicted lifespan of the electrodeionization water production apparatus; an output unit that outputs information according to the predicted lifespan predicted by the prediction unit; The calculation unit calculates the individual predicted lifespan based on a rate of change over time of measured values ​​for at least two of the plurality of measurement items.

6. 1. A diagnostic method for diagnosing an electrodeionization water production apparatus, comprising: a process of acquiring measured values ​​measured by one or more measuring devices for each of a plurality of measurement items for the electrodeionized water production apparatus; A process of calculating an individual predicted lifespan based on the acquired rate of change over time of measured values ​​for at least two of the plurality of measurement items; a process of predicting the shortest individual predicted lifespan among the calculated plurality of individual predicted lifespans as the predicted lifespan of the electrodeionization water production apparatus; and displaying information corresponding to the predicted lifespan on a display unit.

7. On the computer, a step of acquiring measurement values ​​measured by one or more measuring devices for each of a plurality of measurement items in the electrodeionization water production apparatus; a step of calculating an individual predicted lifespan based on the acquired rate of change over time of the measured values ​​for at least two of the plurality of measurement items; predicting the shortest individual predicted lifespan among the calculated plurality of individual predicted lifespans as the predicted lifespan of the electrodeionization water production apparatus; and a program for causing a display unit to display information corresponding to the predicted lifespan.

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