JP7440831B2 - diagnostic equipment - Google Patents

Description

The present invention relates to a technique for outputting the amount of steam leaked from a steam trap.

In a plant or the like equipped with a steam piping system, condensate (drain) may be generated within the piping system due to heat exchange, heat radiation, or the like. If this condensate remains in the piping system, it will cause a decrease in operating efficiency. For this reason, generally, a steam trap is installed at an appropriate location in the piping system, and the steam trap is used to discharge condensate to the outside of the piping system.

If the sealing performance of the steam trap is impaired due to aging or malfunction, steam within the steam piping system will leak to the outside through the steam trap, resulting in unnecessary steam loss. For this reason, conventionally, the vibration of the steam trap has been measured periodically, such as once a year, using a diagnostic device such as that disclosed in Patent Document 1, and the measured value and the vibration characteristics of the steam trap have been measured. Based on this, work is being carried out to diagnose the amount of steam leaking from each steam trap.

JP2018-84418A

The vibration characteristics of a steam trap differ depending on the valve opening/closing method (hereinafter referred to as model). For example, a disk-type steam trap whose valve is opened and closed by a disc-shaped disk and a float-type steam trap whose valve is opened and closed by a spherical float have different vibration values when the vibrations reach saturation in the steam trap. When the vibrations in the steam trap are saturated, it means that the amplitude of the vibrations of the steam trap reaches its maximum due to the structure of the steam trap, and a state is reached where it is no longer possible to vibrate with a larger amplitude.

However, conventionally, the amount of steam leakage from a steam trap has only been diagnosed using the vibration characteristics of typical types of steam traps, and no diagnosis has been made that takes into account the differences in steam trap types. It wasn't. For this reason, when the vibration of a steam trap of a type different from the typical type is measured, there is a problem that the leakage amount of steam cannot be accurately output.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diagnostic device that can accurately output the amount of steam leakage in a steam trap of a different type from a certain steam trap. .

A diagnostic device according to one aspect of the present invention is a diagnostic device that outputs a leakage amount of steam from a steam trap, and the steam trap includes a first steam trap and a second steam trap different in type from the first steam trap. a sensor that outputs an analog signal indicative of the vibration of the second steam trap, an amplifier circuit that amplifies the output signal of the sensor with a constant gain, and converts the output signal of the amplifier circuit into a digital signal. and an amplification that amplifies the output signal of the AD converter by a ratio of the vibration value when the vibration is saturated in the first steam trap to the vibration value when the vibration is saturated in the second steam trap. a converting unit that converts the vibration value of the second steam trap indicated by the output signal of the amplifying unit into an amount of steam leaking from the second steam trap, and outputting the amount of steam leaking from the second steam trap. and an output section.

According to this configuration, the output signal of the AD converter is amplified by the amplifying section at the ratio of the vibration value when the vibration is saturated in the first steam trap to the vibration value when the vibration is saturated in the second steam trap. Ru. Then, the vibration value of the second steam trap indicated by the output signal of the amplification section is converted into the leakage amount of steam from the second steam trap.

Therefore, this configuration is the same as the case where the sensor outputs an analog signal indicating the vibration of the first steam trap, and the vibration value of the first steam trap indicated by the output signal of the AD converter is converted into the amount of steam leakage. The vibration value of the second steam trap can be converted into a steam leakage amount with precision. As a result, in this configuration, the vibration value of the second steam trap indicated by the output signal of the AD converter is converted into the amount of steam leakage, without amplifying the output signal of the AD converter. It is possible to accurately output the amount of steam leakage.

In the above aspect, the sensor further outputs an analog signal indicating the vibration of the first steam trap, and the converter further outputs a vibration value of the first steam trap indicated by the output signal of the AD converter. , the output unit may further output the amount of steam leaked from the first steam trap.

According to this configuration, the leakage amount of steam in the first steam trap can be output with high accuracy.

In the above aspect, the converter is configured to convert the first steam trap, which is indicated by the output signal of the AD converter, based on a first vibration characteristic indicating the relationship between the amount of leakage of steam in the first steam trap and a vibration value. The vibration value may be converted into a leakage amount of steam from the first steam trap.

According to this configuration, the vibration value of the first steam trap indicated by the output signal of the AD converter can be converted into the leakage amount of steam corresponding to the vibration value based on the first vibration characteristic. It is possible to output the amount of steam leakage with high accuracy.

In the above aspect, the conversion unit uses a function obtained by linearly approximating the first vibration characteristic indicating the relationship between the amount of leakage of steam in the first steam trap and the vibration value to generate the The vibration value of the first steam trap may be converted into a leakage amount of steam from the first steam trap.

According to this configuration, the vibration value of the first steam trap indicated by the output signal of the AD converter can be converted into the leakage amount of steam corresponding to the vibration value using a function obtained by linearly approximating the first vibration characteristic. , the converter can be simplified.

In the above aspect, the converting unit is configured to generate vibrations of the second steam trap indicated by the output signal of the amplifying unit based on a second vibration characteristic indicating a relationship between a steam leakage amount and a vibration value in the second steam trap. The value may be converted into a leakage amount of steam from the second steam trap.

According to this configuration, the vibration value of the second steam trap indicated by the output signal of the amplification section can be converted into the leakage amount of steam corresponding to the vibration value based on the second vibration characteristic, so that The amount of steam leakage can be output with high accuracy.

In the above aspect, the converting section uses a function obtained by linearly approximating a second vibration characteristic indicating a relationship between the amount of steam leakage and a vibration value in the second steam trap, and converts the second vibration characteristic indicated by the output signal of the amplifying section into The vibration value of the second steam trap may be converted into a leakage amount of steam from the second steam trap.

According to this configuration, the vibration value of the second steam trap indicated by the output signal of the amplification section can be converted into the leakage amount of steam corresponding to the vibration value using a function obtained by linearly approximating the second vibration characteristic. The converter can be simplified.

According to the present invention, it is possible to provide a diagnostic device that can accurately output the amount of steam leakage in a steam trap of a different type from a certain steam trap.

FIG. 1 is a block diagram showing the configuration of a diagnostic device according to an embodiment of the present invention. It is a figure showing an example of a management ledger. FIG. 3 is a diagram illustrating an example of vibration characteristics of multiple types of steam traps. It is a figure which shows an example of the process which converts the vibration value of the steam trap of a type|mold into the leakage amount of steam. It is a figure which shows an example of the process which converts the vibration value of the steam trap of a type IV into the amount of leakage of steam. It is a figure which shows another example of the process which converts the vibration value of the steam trap of type|mold I into the leakage amount of steam.

Hereinafter, embodiments of the present invention will be described in detail using the drawings. In addition, elements given the same reference numerals in different drawings indicate the same or corresponding elements. FIG. 1 is a block diagram showing the configuration of a diagnostic device 1 according to an embodiment of the present invention.

In a plant or the like equipped with a steam piping system, a plurality of steam traps are installed at appropriate locations in the piping system in order to discharge condensate (drainage) generated within the piping system to the outside of the piping system. The performance of the steam trap is diagnosed through periodic diagnosis, such as once a year. A worker carrying out a periodic diagnosis sequentially diagnoses the performance of each steam trap by carrying the diagnostic device 1 and moving around the plant. Note that the diagnosis of the performance of the steam trap is not limited to regular diagnosis, but may be irregular diagnosis. In the following, an example will be explained in which a periodic diagnosis is performed to diagnose the amount of steam leaking from a steam trap.

If it is permitted to bring a data processing device such as a laptop into the plant, the worker should carry the data processing device along with diagnostic device 1 and diagnose the amount of steam leaking from each steam trap in turn. You can also. In this case, the diagnostic device 1 can transmit the diagnostic results of each steam trap in real time to a server device such as a cloud server via the data processing device and any communication network such as a public line network. .

On the other hand, if bringing the data processing device into the plant is prohibited, the worker should store the data processing device in a standby area such as a commercial vehicle or field office, and carry only the diagnostic device 1 with him. The amount of steam leaking from each steam trap is diagnosed in turn. In this case, the diagnostic results of each steam trap are stored within the diagnostic device 1. After the worker returns to the waiting area, the diagnostic device 1 transmits the diagnostic results of the plurality of steam traps stored in the diagnostic device 1 to the server device via the data processing device and the communication network.

The configuration of the diagnostic device 1 will be described in detail below. As shown in FIG. 1, the diagnostic device 1 includes a probe 19, a vibration sensor 11 (sensor), an amplifier circuit 12, an operation section 13, a display section 14 (output section), a storage section 15 (output section), and a communication section 16. (output section), an IF (interface) section 17 (output section), and a control section 10.

The probe 19 is a rod-shaped member whose tip is pressed against the steam trap, and vibrates at a predetermined resonance frequency. The vibration sensor 22 outputs an analog signal indicating the vibration of the steam trap transmitted to the probe 19 to the amplifier circuit 12 when the tip of the probe 19 is pressed against the steam trap.

The amplifier circuit 12 is provided to improve the accuracy of conversion from an analog signal to a digital signal in the AD converter 20 at the subsequent stage. The amplifier circuit 12 amplifies the output signal of the vibration sensor 22 with a constant gain. The gain is a constant determined by the resistance value of the resistance element constituting the amplifier circuit 12. Details of the gain will be described later.

The operation unit 13 is composed of operation switches and the like for the operator to input various information. The display unit 14 is configured using a liquid crystal display, an organic EL display, or the like. However, the operation section 13 and the display section 14 may be configured as one by using a touch panel display. The display unit 14 displays various information under the control of the control unit 10. For example, the display unit 14 displays (outputs) the amount of leakage of steam from the steam trap converted by the conversion unit 60.

The storage unit 15 is configured using a rewritable semiconductor memory such as a flash memory. Various information is stored in the storage unit 15 by the control unit 10. FIG. 2 is a diagram showing an example of the management ledger 91. For example, as shown in FIG. 2, the storage unit 15 stores a management ledger 91 for managing a plurality of steam traps to be diagnosed.

The management ledger 91 is created in the data processing device. Specifically, the management ledger 91 includes absolute position information I1, identification information I2, attribute information I3, and characteristic information I4 regarding each of the plurality of steam traps to be diagnosed.

The absolute position information I1 is information indicating the installation position of each steam trap. The management ledger 91 in FIG. 2 shows an example in which coordinates indicating the area where each steam trap is installed when the plant is divided into a plurality of areas are described as the absolute position information I1.

The identification information I2 is information for identifying each steam trap. FIG. 2 shows an example in which trap numbers T1 to T9 for identifying each steam trap are described as the identification information I2.

Attribute information I3 is information indicating the attributes of each steam trap. FIG. 2 shows an example in which the manufacturer name, model, and model of each steam trap are described as the attribute information I3. Information specifying the model of the steam trap (for example, AB111) is written in the model. A plurality of steam traps that may be installed within a plant are classified into a plurality of types of steam traps depending on the valve opening/closing method. The type describes information (for example, I) that specifies the opening/closing method of the valve in the steam trap. Note that the attribute information I3 may include information indicating other attributes of the steam trap.

The characteristic information I4 is information regarding various characteristics of each steam trap, which is used for diagnosing the performance of each steam trap. FIG. 2 shows an example in which vibration characteristic information and amplification factor information used for diagnosing the amount of steam leakage in each steam trap are described as characteristic information I4.

The vibration characteristic information is information indicating the vibration characteristics of each steam trap. The vibration characteristics indicate the relationship between the amount of steam leaking in the steam trap and the vibration value. The vibration characteristics of steam traps vary depending on the type.

For example, FIG. 2 shows an example in which information indicating the vibration characteristic G11 of a type I steam trap is described as vibration characteristic information corresponding to two steam traps with trap numbers T1 and T4 classified as type I. ing. Further, FIG. 2 shows an example in which information indicating the vibration characteristic G41 of a steam trap of type IV is described as vibration characteristic information corresponding to one steam trap of trap number T6 classified as type IV. . Details of the vibration characteristic information will be described later.

The amplification factor information is information indicating an amplification factor used by the amplification section 40, which will be described later. The amplification factor is set based on the vibration characteristics of each steam trap and the vibration characteristics of a reference type steam trap. The standard type steam trap refers to a type of steam trap that exhibits average vibration characteristics among a plurality of types I to VI steam traps. In this embodiment, the reference type is assumed to be type IV.

Specifically, the ratio of the vibration value when the vibration is saturated in the standard type steam trap to the vibration value when the vibration is saturated in each steam trap is set as the amplification factor. For example, FIG. 2 shows an example in which the amplification factor used when diagnosing a Type I steam trap is set to "C1". Further, FIG. 2 shows an example in which the amplification factor used when diagnosing steam traps of types IV, V, and VI is set to "1". Details of the amplification factor information will be described later.

In addition, in the management ledger 91 of FIG. 2, the order in which the plurality of steam traps are arranged is the order of diagnosis. However, the order in which the plurality of steam traps are arranged in the management ledger 91 is not limited to this, and may be in descending order or ascending order of trap numbers.

The communication unit 16 is configured using a communication circuit compatible with any communication method such as Bluetooth (registered trademark). The communication unit 16 receives various information from the external device by communicating with the external device such as the data processing device. The communication unit 16 outputs the received information to the control unit 10. Further, under the control of the control unit 10, the communication unit 16 transmits (outputs) various information to the external device by communicating with the external device such as the data processing device.

For example, if bringing the data processing device into the plant is permitted, the communication unit 16 receives the management ledger 91 from the data processing device and outputs the management ledger 91 to the control unit 10. In this case, the control unit 10 stores the management ledger 91 input from the communication unit 16 in the storage unit 15. Further, the control unit 10 controls the communication unit 16 to transmit an instruction to the data processing device to request that the management ledger 91 in which the diagnosis results of each steam trap are added is transmitted to the server device.

The IF unit 17 is composed of input/output terminals and the like to which a flash memory 7 such as an SD card or a USB memory is removably connected. The IF unit 17 inputs and outputs information between the flash memory 7 and the control unit 10 while the flash memory 7 is connected to the IF unit 17 .

For example, if bringing the data processing device into the plant is prohibited, the IF unit 17 reads the management ledger 91 stored in the flash memory 7 and outputs the read management ledger 91 to the control unit 10. do. In this case, the control unit 10 stores the management ledger 91 input from the IF unit 17 in the storage unit 15. Further, the control unit 10 controls the IF unit 17 to output (write) to the flash memory 7 a management ledger 91 in which the diagnosis results of each steam trap are added. In this case, the worker for the periodic diagnosis connects the flash memory 7 to the data processing device after returning to the standby location. Then, the worker performs an operation in the data processing device to obtain the updated management ledger 91 from the flash memory 7 and to transmit the obtained updated management ledger 91 to the server device.

The control unit 10 includes a CPU (Central Processing Unit) (not shown) that executes predetermined arithmetic processing, a non-volatile memory (not shown) such as an EEPROM in which a predetermined control program is stored, and a non-volatile memory (not shown) for temporarily storing data. The microcomputer includes a RAM (Random Access Memory) (not shown) and peripheral circuits.

The control unit 10 includes an AD converter 20 as the peripheral circuit. The AD converter 20 converts the output signal of the amplifier circuit 12 into a digital signal.

Furthermore, the control section 10 functions as the amplification section 40 and the conversion section 60 by executing a control program stored in the nonvolatile memory.

The amplification unit 40 refers to the management ledger 91 (FIG. 2) stored in the storage unit 15 and acquires amplification factor information associated with the steam trap to be diagnosed. The amplification section 40 amplifies the output signal of the AD converter 20 with an amplification factor indicated by the amplification factor information. For example, when diagnosing a Type I steam trap included in the management ledger 91 in FIG. 2, the amplification unit 40 amplifies the output signal of the AD converter 20 with an amplification factor of "C1".

The conversion unit 60 refers to the management ledger 91 (FIG. 2) stored in the storage unit 15 and acquires vibration characteristic information associated with the steam trap to be diagnosed. The conversion unit 60 converts the vibration value of the steam trap indicated by the output signal of the amplification unit 40 into the leakage amount of steam from the steam trap based on the vibration characteristic indicated by the vibration characteristic information. Details of the converter 60 will be described later.

Below, details of the vibration characteristic information set in the management ledger 91 (FIG. 2), the gain used by the amplifier circuit 12, the amplification factor information set in the management ledger 91 (FIG. 2), and the converter 60 will be described.

FIG. 3 is a diagram illustrating an example of vibration characteristics of multiple types of steam traps. In FIG. 3, the horizontal axis represents the amount of steam leaked from the steam trap, and the vertical axis represents the vibration value (vibration level) of the steam trap. The vibration characteristic G11 is a type I vibration characteristic. The vibration characteristic G21 is a type II vibration characteristic. The vibration characteristic G31 is a type III vibration characteristic. Vibration characteristic G41 is the vibration characteristic of type IV. Vibration characteristic G51 is the vibration characteristic of type V. Vibration characteristic G61 is the vibration characteristic of type VI. Hereinafter, for convenience of explanation, the six vibration characteristics G11, G21, G31, G41, G51, and G61 will be abbreviated as vibration characteristics G11 to G61. The vibration characteristics G11 to G61 are derived based on experimental values using various types of steam traps.

The vibration value "L40" is the vibration value when the vibrations of the type IV, V, and VI steam traps are saturated. When the vibrations of the steam trap are saturated, it means that due to the structure of the steam trap, the amplitude of the vibrations of the steam trap has reached its maximum, and it is no longer possible to vibrate with a larger amplitude. The vibration values "L10", "L20", and "L30" are vibration values when the vibrations of the type I, II, and III steam traps are saturated, respectively.

As shown by the vibration characteristics G11 to G61, the vibration characteristics of each type have a characteristic that the vibration value increases quadratically or exponentially as the amount of steam leakage increases. In the vibration characteristic information of the management ledger 91 (FIG. 2), a quadratic function or an exponential function indicating the vibration characteristics G11 to G61 of each steam trap type is described.

The gain used by the amplifier circuit 12 is set based on the vibration characteristic G41 of the standard type IV. Hereinafter, the standard type IV steam trap will be referred to as a first steam trap.

Specifically, the gain used by the amplifier circuit 12 is such that when diagnosing the first steam trap, the range of vibration values of the first steam trap indicated by the output signal of the AD converter 20 (FIG. 1) is based on the standard type IV. It is set to match the vibration value range (“0” to “L40”) indicated by the vibration characteristic G41. That is, the gain used by the amplifier circuit 12 is set so that the output signal of the AD converter 20 (FIG. 1) is not amplified in the amplifier section 40 when diagnosing the first steam trap.

Therefore, the amplification factor used by the amplifying section 40 when diagnosing the first steam trap is set to "1" indicating that the output signal of the AD converter 20 (FIG. 1) is not amplified. Therefore, information indicating an amplification factor of "1" is written in the increase rate information corresponding to the first steam trap (standard type IV steam trap) in the management ledger 91 (FIG. 2).

When diagnosing the first steam trap, the conversion unit 60 refers to the management ledger 91 (FIG. 2) stored in the storage unit 15 and acquires vibration characteristic information associated with the first steam trap. In this case, the output signal of the AD converter 20 is input to the conversion section 60 without being amplified. Therefore, the conversion unit 60 converts the vibration value (for example, L1) of the first steam trap indicated by the output signal of the AD converter 20 into a quadratic function or an exponential function indicating the vibration characteristic G41 indicated by the vibration characteristic information. The vibration value is substituted into the steam leakage amount (for example, B41) corresponding to the vibration value.

On the other hand, when diagnosing a type I steam trap (second steam trap) different from the standard type IV, it is assumed that the amplification factor used by the amplifying section 40 is set to "1". In this case, the output signal of the AD converter 20 is input to the conversion section 60 without being amplified. For this reason, although it is possible to input a signal indicating a vibration value in the range from "0" to "L40" to the conversion unit 60, the vibration value from "0" to "L10" indicated by the vibration characteristic G11 of the type I is input. Only signals indicating vibration values in the range up to are input.

Here, for example, it is assumed that the vibration value "L40" is 400 dB and the vibration value "L10" is 40 dB. Further, it is assumed that the converter 60 is capable of converting 400 types of vibration values into 400 types of steam leakage amounts due to the performance of the CPU.

In this case, when diagnosing the first steam trap, the range of vibration values indicated by the signal input to the converter 60 is from 0 dB to 400 dB. It is possible to convert vibration values into 400 different amounts of steam leakage. On the other hand, when diagnosing a Type I steam trap, the range of vibration values indicated by the signal input to the converter 60 is reduced to a range from 0 dB to 40 dB. Therefore, the converter 60 can only convert 40 types of vibration values into 40 types of steam leakage amounts in 1 dB units.

In this way, when the vibration value of the type I steam trap indicated by the output signal of the AD converter 20 is converted into the amount of steam leakage in the conversion section 60 without amplifying the output signal of the AD converter 20, the conversion section The accuracy of the conversion at 60 is worse than when diagnosing the first steam trap. Therefore, the amplification factor used by the amplifying section 40 when diagnosing the Type I steam trap is set so that the accuracy of conversion in the converting section 60 is the same as when diagnosing the first steam trap.

Specifically, when diagnosing a Type I steam trap, the amplification factor used by the amplification unit 40 is the amplification factor of the standard Type IV steam trap with respect to the vibration value "L10" when the vibration of the Type I steam trap is saturated. The ratio of the vibration value "L40" when the vibration is saturated is set to "C1 (=L40/L10)". Therefore, information indicating the amplification factor "C1" is written in the increase rate information corresponding to the type I steam trap in the management ledger 91 (FIG. 2).

FIG. 4 is a diagram illustrating an example of a process for converting a measured value of vibration of a Type I steam trap into an amount of steam leakage. As shown in FIG. 4, when the amplification factor used by the amplifying section 40 is set to the ratio "C1", the maximum value of the vibration value indicated by the output signal of the amplifying section 40 input to the converting section 60 is The vibration value is "L10" when the vibration of the steam trap is saturated. In other words, when diagnosing a Type I steam trap, the converter 60 converts 400 different vibration values indicated by the output signal of the amplifier 40 in units of 1/C1 when diagnosing a Standard Type IV steam trap. It is possible to convert the amount of steam leakage in 400 ways.

In the above example, the conversion unit 60 converts 400 vibration values indicated by the output signal of the amplification unit 40 into 400 vibration values in units of 0.1 (=1/C1=L10/L40=40/400) dB. can be converted into leakage amount. As a result, the conversion accuracy in the converter 60 when diagnosing the Type I steam trap is the same as when diagnosing the first steam trap.

When diagnosing a Type I steam trap, the conversion unit 60 refers to the management ledger 91 (FIG. 2) stored in the storage unit 15 and determines the vibration characteristics associated with the Type I steam trap to be diagnosed. Get information. The conversion unit 60 substitutes the vibration value (for example, L2) of the type I steam trap indicated by the output signal of the amplification unit 40 into a quadratic function or an exponential function indicating the vibration characteristic G11 indicated by the vibration characteristic information, The vibration value is converted into a steam leakage amount (for example, B12) corresponding to the vibration value.

Similarly, when diagnosing a type II steam trap that is different from the standard type IV, the amplification factor used by the amplification unit 40 is the vibration value "L20" when the vibration of the type II steam trap is saturated (Fig. 3 ) to the vibration value "L40" when the vibration of the standard type IV steam trap is saturated is set to "C2 (=L40/L20)".

In addition, when diagnosing a type III steam trap different from the standard type IV, the amplification factor used by the amplifying unit 40 is the amplification factor of the standard type IV with respect to the vibration value "L30" when the vibration of the type III steam trap is saturated. The ratio of the vibration value "L40" when the vibration of the steam trap is saturated is set to "C3 (=L40/L30)". When diagnosing steam traps of types V and VI, which are different from the standard type IV, the amplification factor used by the amplification unit 40 is based on the standard type with respect to the vibration value "L40" at which the vibration of the steam traps of types V and VI saturates. The ratio of the vibration value "L40" when the vibration of the IV steam trap is saturated is set to "1 (=L40/L40)".

When diagnosing steam traps of types II, III, V, and VI, the conversion unit 60 refers to the management ledger 91 (FIG. 2) stored in the storage unit 15 and determines the type of steam trap that is associated with the steam trap to be diagnosed. Obtain vibration characteristic information. Then, the conversion unit 60 substitutes the vibration value of the steam trap to be diagnosed indicated by the output signal of the amplification unit 40 into a quadratic function or an exponential function indicating the vibration characteristic indicated by the vibration characteristic information, and converts the vibration value into the vibration value. Convert to the corresponding steam leakage amount.

According to the configuration of the present embodiment, the amplification unit 40 controls the vibration value (for example, L10) when the vibration is saturated in the target steam trap (for example, a steam trap of type I) whose type is different from the first steam trap. The output signal of the AD converter 20 is amplified at the ratio of the vibration value (for example, L40) when the vibration is saturated in the first steam trap. Then, the vibration value of the target steam trap indicated by the output signal of the amplifying section 40 is converted into the amount of steam leakage.

Therefore, the conversion unit 60 can convert the vibration value of the target steam trap into the amount of steam leakage with the same accuracy as when converting the vibration value of the first steam trap into the amount of steam leakage. As a result, in this configuration, the first steam It is possible to accurately output the amount of steam leaked from the target steam trap, which is of a different type from the trap.

Hereinafter, the working procedure of periodic diagnosis using the diagnostic device 1 will be explained. By moving around the plant carrying the diagnostic device 1 (and the data processing device if permitted), a worker performing periodic diagnosis sequentially measures the amount of steam leaking from each steam trap using the diagnostic device 1. Diagnose.

At this time, the control section 10 displays the management ledger 91 stored in the storage section 15 on the display section 14 by the operation of the operation section 13 by the operator. Thereby, the operator can recognize the diagnosis order of a plurality of steam traps installed in the plant, and the absolute position information I1, identification information I2, and attribute information I3 of each steam trap.

The operator moves to the installation location of the steam trap to be diagnosed this time, according to the diagnosis order and absolute position that can be recognized from the displayed management ledger 91. The operator selects one target steam trap to be diagnosed this time from among the plurality of target steam traps included in the management ledger 91 by operating the operating unit 13 . As a result, information indicating that the one target steam trap has been selected as the current diagnosis target (hereinafter referred to as selection information) is input from the operation unit 13 to the control unit 10 .

Next, the operator presses the probe 19 (FIG. 1) of the diagnostic device 1 against the steam trap to be diagnosed this time. Thereby, the vibration value of the target steam trap is converted into the amount of steam leakage from the target steam trap. At this time, the control unit 10 outputs an instruction to display the leakage amount of steam from the target steam trap to the display unit 14. The display unit 14 displays (outputs) information indicating the leakage amount of steam from the target steam trap in accordance with the display instruction.

Further, the control unit 10 adds information indicating the leakage amount of steam from the target steam trap to a location in the management ledger 91 that corresponds to the target steam trap indicated by the selection information. The control unit 10 outputs a storage instruction for the management ledger 91 after the additional writing to the storage unit 15. In accordance with the storage instruction, the storage unit 15 stores (outputs) the management ledger 91 to which information indicating the amount of steam leaked from the target steam trap is added. Thereby, the control unit 10 updates the management ledger 91 stored in the storage unit 15.

Incidentally, if the operator does not carry the data processing device, he connects the flash memory 7 to the IF unit 17 after completing the diagnosis of all target steam traps. The control unit 10 acquires the management ledger 91 stored in the storage unit 15 and outputs a storage instruction for the management ledger 91 to the IF unit 17. The IF unit 17 stores (outputs) the management ledger 91 in the flash memory 7 in accordance with the storage instruction.

On the other hand, it is assumed that the diagnosis of all target steam traps has been completed when the worker is carrying the data processing device. In this case, the control unit 10 acquires the updated management ledger 91 stored in the storage unit 15 and sends an instruction to the data processing device via the communication unit 16 to transmit the management ledger 91 to the server device. Send to. The data processing device transmits the updated management ledger 91 to the server device according to the instruction.

The vibration characteristic information stored in the management ledger 91 is not limited to information indicating a quadratic function or an exponential function indicating the vibration characteristic of each steam trap, but may also be information indicating a function that linearly approximates the vibration characteristic of each steam trap. It's okay.

FIG. 5 is a diagram showing an example of a process for converting the vibration value of a type IV steam trap into a steam leakage amount. In accordance with the above, when diagnosing the first steam trap of standard type IV, the converter 60 converts the vibration value of the first steam trap (for example, L1 ) may be substituted into a function G411 that is a linear approximation of the vibration characteristic G41 indicated by the vibration characteristic information, and converted into a steam leakage amount (for example, B411) corresponding to the vibration value.

FIG. 6 is a diagram showing another example of the process of converting the vibration value of the Type I steam trap into the amount of steam leakage. Similarly, when diagnosing a Type I steam trap different from the standard Type IV, the conversion unit 60 converts the vibration value of the Type I steam trap indicated by the output signal of the amplification unit 40 (for example, L2) may be substituted into a function G111 that is a linear approximation of the vibration characteristic G11 indicated by the vibration characteristic information, and converted into a steam leakage amount (for example, B121) corresponding to the vibration value.

Similarly, when diagnosing a type II, III, V, or VI steam trap different from the standard type IV, the converter 60 diagnoses the type II, III, V, or VI steam trap indicated by the output signal of the amplifier 40. The vibration value may be substituted into a function obtained by linearly approximating the vibration characteristics G21, G31, G51, and G61 indicated by the vibration characteristic information, and converted into the amount of steam leakage corresponding to the vibration value.

1: Diagnostic device 11: Vibration sensor (sensor)
12: Amplifier circuit 14: Display section (output section)
15: Storage section (output section)
16: Communication section (output section)
17: IF section (output section)
20: AD converter 40: Amplification section 60: Conversion section

Claims (6)

A diagnostic device that outputs the amount of steam leaked from a steam trap,
The steam trap includes a first steam trap and a second steam trap of a different type from the first steam trap,
a sensor that outputs an analog signal indicating vibration of the second steam trap;
an amplifier circuit that amplifies the output signal of the sensor with a constant gain;
an AD converter that converts the output signal of the amplifier circuit into a digital signal;
an amplification unit that amplifies the output signal of the AD converter by a ratio of a vibration value when vibration is saturated in the first steam trap to a vibration value when vibration is saturated in the second steam trap;
a conversion unit that converts a vibration value of the second steam trap indicated by an output signal of the amplification unit into a leakage amount of steam from the second steam trap;
an output unit that outputs a leakage amount of steam from the second steam trap;
A diagnostic device comprising: The sensor further outputs an analog signal indicative of vibrations of the first steam trap;
The conversion unit further converts the vibration value of the first steam trap indicated by the output signal of the AD converter into a leakage amount of steam from the first steam trap,
The output unit further outputs a leakage amount of steam from the first steam trap.
The diagnostic device according to claim 1. The conversion unit converts the vibration value of the first steam trap indicated by the output signal of the AD converter into the vibration value based on a first vibration characteristic indicating a relationship between the amount of steam leakage and the vibration value in the first steam trap. converting it into the amount of steam leaking from the first steam trap;
The diagnostic device according to claim 2. The conversion unit uses a function obtained by linearly approximating a first vibration characteristic indicating the relationship between the amount of steam leakage and the vibration value in the first steam trap, and converts the first steam trap indicated by the output signal of the AD converter into a linear approximation function. converting the vibration value of into an amount of steam leakage from the first steam trap;
The diagnostic device according to claim 2. The conversion unit converts the vibration value of the second steam trap indicated by the output signal of the amplification unit into the vibration value based on a second vibration characteristic indicating a relationship between the amount of steam leakage and the vibration value in the second steam trap. Converting to the leakage amount of steam from the second steam trap,
A diagnostic device according to any one of claims 1 to 4. The conversion unit uses a function obtained by linearly approximating a second vibration characteristic indicating the relationship between the amount of leakage of steam and the vibration value in the second steam trap, and the converter converts the output signal of the second steam trap indicated by the output signal of the amplification unit. converting the vibration value into a leakage amount of steam from the second steam trap;
A diagnostic device according to any one of claims 1 to 4.