JP2005164315A - Facility diagnostic system, pump or motor, and system controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a facility diagnostic system, a pump or a motor and a system controller capable of detecting the deterioration of a bearing, an impeller and the like of a rotating part in the pump or the motor, and capable of executing maintenance before the occurrence of a trouble in the pump or the motor to prevent the trouble. <P>SOLUTION: This diagnostic system comprises a sensor net terminal 50 formed with a strain sensor deformed by vibration, and with an electric power source comprising an element generating power by the vibration, and attached to a casing of the the pump 20 or the motor 21 to measure a strain amount; an antenna 60 for transmitting the strain amount measured by the sensor net terminal 50 by a radio wave; a base station terminal 70 for receiving a data transmitted by the radio wave; and the system controller 12 for analyzing the data received by the base station terminal 70. A vibration frequency of the pump or the motor is detected on the basis of a waveform of the strain amount obtained by the analysis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a facility diagnosis system and a pump or motor and a system control device, particularly diagnoses deterioration of pumps and motors used in water supply and sewage water supply and distribution facilities and industrial production facilities, and makes maintenance and repair efficient. It is related with the technology for making it.

Pumps and motors used in water and sewage water supply / distribution facilities and industrial production facilities are the main equipment of the facilities and are particularly important as devices for maintenance and repair. Conventionally, maintenance of pumps and motors has been carried out by regularly checking or repairing or replacing when a failure occurs. For this reason, it was difficult to prevent the failure by detecting the deterioration of the pump and motor and performing maintenance before the failure occurred. Therefore, Patent Document 1 is known as a proposal for maintenance of a pump and a motor.
JP 2003-67519 A

  An object of the present invention is to detect deterioration of bearings and impellers of rotating parts of a pump and a motor, and perform maintenance before the pump or motor breaks down, thereby preventing the failure in advance. And providing a pump or motor and system controller.

  The present invention includes a sensor network terminal that is formed with a strain sensor that is deformed by vibration and an element that generates power by vibration, and that is attached to a casing of a pump or a motor to measure the amount of strain, and the strain measured by the sensor network terminal. An antenna for transmitting the amount of data wirelessly, a base station terminal that receives the data transmitted wirelessly, and a system controller that analyzes the data received by the base station terminal. This is a facility diagnostic system that detects the frequency of a pump or motor from a waveform.

  In addition, the present invention provides a sensor network terminal that includes a strain sensor that is deformed by vibration and a power source that includes an element that generates power by vibration, and is attached to a rotating part of a pump or a motor to measure the amount of strain. Obtained by analysis, consisting of an antenna for wirelessly transmitting the measured strain amount, a base station terminal that receives the wirelessly transmitted data, and a system controller that analyzes the data received by the base station terminal It is an equipment diagnosis system that detects the frequency of the rotating part of the pump or motor from the waveform of the strain amount.

  The present invention is an equipment diagnosis system that determines deterioration of a pump or a motor from a detected change in frequency.

  Furthermore, the present invention is a pump in which a sensor network terminal in which a strain sensor that is deformed by vibration and a power source composed of an element that generates power by vibration are formed is attached to a casing or a rotating part.

  In addition, the present invention is a motor in which a sensor network terminal in which a strain sensor that is deformed by vibration and a power source including an element that generates power by vibration are formed is attached to a casing or a rotating part.

  And this invention analyzes the distortion | strain amount measured with the sensor net terminal attached to the casing or rotation part of a pump or a motor in which the distortion sensor and the power source which consist of elements which generate electricity by vibration are formed. It is a system control device that detects the frequency of the pump or motor or its rotating part from the obtained waveform of strain.

  While pumps and motors generate high-frequency vibrations during normal operation, low-frequency vibrations appear when pumps and motors deteriorate. The present invention detects deterioration of a pump or a motor by detecting the vibration frequency using this characteristic.

The procedure for detecting the frequency of the pump or motor can be performed as follows.
(1) A strain sensor built in the sensor network terminal measures the strain of the pump and motor.
(2) Using a power supply built in the sensor network terminal, a distortion signal is transmitted wirelessly to the system control device.
(3) The system control device analyzes the waveform of the received strain data and detects the frequency of the pump or motor.
The system control device determines the degree of deterioration of the pump and the motor from the vibration frequency of the pump and the motor detected by the above procedure and the secular change of the vibration frequency.

  According to the present invention, the frequency of a pump or a motor can be measured in a non-contact manner using radio. In order to acquire data by attaching a sensor to a pump or a motor and wiring the sensor, it takes a lot of man-hours. However, since the sensor data is acquired wirelessly, the wiring man-hours are not necessary. Further, by wirelessly connecting a plurality of inexpensive sensor network terminals to one relatively expensive system control device, a plurality of pumps and motors can be monitored at a time. Since there are many cases where a plurality of pumps and motors are used side by side at a production site, wireless sensing contributes to cost reduction.

  Further, the strain sensor can be easily made into one chip, and can be a small and inexpensive sensor.

  The sensor net terminal power supply can use elements that generate electricity with minute vibrations that exist naturally in the equipment, and can be integrated into a single sensor into a single chip, making it possible to mass-produce at low cost. It becomes possible.

  In addition, since the waveform of the distortion signal itself is transmitted to the system control device, there is no need to record or process the signal on the sensor network terminal side, so the burden on the CPU and memory on the sensor network terminal side can be reduced. . For this reason, the strain sensor and the one chip of the power source do not have a program dedicated to a specific application, and can be a sensor network terminal for measuring the frequency for a general-purpose application, enabling mass production.

  Such a sensor network terminal with a strain sensor and a power supply as a single chip can be installed in advance as standard when producing pumps and motors at the factory, and it is necessary to measure the frequency after shipment from the factory. Maintenance management can be executed by preparing the system controller at the time. For this reason, it becomes easy to construct a system for managing deterioration of the pump and the motor. Since it has such a feature, it is possible to increase the added value of a pump or a motor with a built-in sensor network terminal in which a strain sensor and a power source are integrated into one chip.

The best mode for carrying out the present invention will be described.
An embodiment of the equipment diagnosis system, pump or motor, and system control apparatus of the present invention will be described with reference to the drawings. In the following embodiments, the object whose frequency is to be measured is a pump. However, the same applies to a motor.

  FIG. 1 shows the configuration of the facility diagnosis system according to the first embodiment. The sensor network terminals 50a to 50c are attached to the casings of the pumps 20a to 20c. The sensor network terminal 50 is attached to the casing of the pump 20, and a strain sensor built in the sensor network terminal 50 measures the strain of the casing of the pump 20. Of the strains measured here, dynamic strains excluding static strains are due to pump vibration.

  The strain data measured by the sensor network terminal 50 is transmitted wirelessly, and the base station terminal 70 receives the data. The received distortion waveform is processed by the system controller 12 to detect the frequency of the pump 20. The pump 20 in which the low frequency frequency indicating the deterioration of the pump 20 is detected needs to be maintained, and a warning is displayed on the screen of the system control device 12.

  The system controller 12 measures the frequency of the plurality of pumps 20a to 20c. In order to distinguish which of the pumps 20a to 20c the signal comes from, the sensor network terminals 50a to 50c put their ID numbers in the radio signals transmitted by themselves.

  FIG. 2 shows an example of a method for detecting the frequency from the strain data. The vibration (strain value) of the pump 20 is shown in the top graph. The lower rectangular wave graph shows the timing at which the sensor network terminal 50 transmits a radio signal. Since the sensor network terminal 50 has a power source that uses an element that generates power by micro vibrations that are naturally present in the pump 20, as shown by this rectangular wave, when t seconds are communicated, there is a break to charge the communication power. The operation of communicating for t seconds is repeated.

In the example of FIG. 2, data is transmitted 12 times during t seconds. During this time, the sensor network terminal 50 transmits 12 strain values. In the example of the figure, the strain values are as follows.
First strain value: Strain amount: 7
Second strain value: Strain amount: 10
Third strain value: Strain amount: 8
・
・
12th strain value: Strain amount: 10
The system control device 12 knows the vibration waveform of the pump 20 by receiving the strain amount values: 7, 10, 8,...

  Since the strain value is raw data at the time of transmission, the sensor network terminal 50 does not need to process the data using elements such as a CPU and a memory, and may transmit the strain value directly. For this reason, the structure of the sensor network terminal 50 can be simplified. By making the data transmission cycle sufficiently finer than the vibration cycle of the pump 20, the vibration waveform of the pump 20 can be restored. Further, the frequency can be obtained from the result.

  When it is necessary to measure even high-frequency vibrations of the pump 20, the strain waveform of the pump 20 can be captured at a fine pitch by using the sensor network terminal 50 having a fast data transmission cycle.

  Since what is measured here is not the amplitude but the frequency, the strict calibration (correction) necessary for a normal sensor is unnecessary, and the handling of the sensor is simple. Moreover, since the frequency can be measured even if the accuracy in the direction of attaching the strain sensor is not high, the sensor network terminal 50 can be easily attached.

  FIG. 3 shows an example of a method for attaching the sensor network terminal 50 to the motor 21. Usually, when the sensor is attached to a pump or a motor, the accuracy of the attachment position is required. However, in the present embodiment, the frequency is measured, and high accuracy is not required for the accuracy of the absolute value of the strain amount. Therefore, as shown in the figure, there may be an error in the mounting accuracy. Cost can be reduced.

  FIG. 4 shows an example of a method for attaching the sensor network terminal 50 to the rotating shaft 22 of the motor 21. Conventionally, it has been difficult to attach a sensor to the rotary shaft 22 because the wiring to the sensor cannot be performed. However, since the sensor network terminal 50 is a wireless type, wiring processing is not possible even if the sensor network terminal 50 is attached to the rotary shaft 22. There is no problem, and the vibration of the rotating shaft 22 can be measured. Thereby, the abnormal low vibration of the rotating shaft 22 can be directly measured, and the deterioration diagnosis of the pump and the motor becomes easy.

  FIG. 5 is a configuration diagram of an example of a wireless network connection according to the embodiment of the present invention. As shown in FIG. 5, the wireless network transmits the data measured by the strain sensor to the base station terminal 70, the sensor network terminals 50a to 50c, the data received from the sensor network terminal 50, and other information to the network 9. The base station terminals 70 a to 70 d, the system control device 12 that receives data from the base station terminal 70 via the network 9, and the network 9 are configured. Data received by the system control device 12 is stored in the control information DB 13. Here, the data that the base station terminal 70 transmits to the network 9 includes sensor measurement values, sensor measurement times, sensor network terminal identification information, and wireless packet information included in the wireless packets sent from each sensor network terminal 50. There is reception time and identification information of the base station terminal 70 that has received the wireless packet.

  FIG. 6 is a diagram showing an example of a block configuration and an appearance image of the sensor network terminal according to the embodiment of the present invention. As shown in FIG. 6A, the sensor network terminal 50 includes an LSI (Large Scale Integrated Circuit) 51 that realizes its central function, an antenna 60 that transmits and receives data to and from the base station terminal 70, It comprises a sensor 61 that deforms in accordance with the vibration displacement, and a power source 62. Here, the sensor 61 is a strain gauge. The power source 62 includes a primary battery, a rechargeable secondary battery, a power generation element (solar power generation element, vibration power generation element, microwave power generation element, etc.) and a capacitor or secondary battery for storing power generation energy, or a combination of these batteries. It is. The LSI 51 is connected to the antenna 60 and is identified by a wireless transmission / reception circuit 52 that controls transmission / reception of data with the base station terminal 70, a controller circuit 53 that is a CPU (Central Processing Unit) that performs overall control of the LSI 51, and the sensor network terminal 50. An identification information recording circuit 54 which is a nonvolatile memory (for example, a flash memory) for recording information, an A / D conversion circuit 55 for A / D (Analog / Digital) conversion of data input from the sensor 61, and a ROM for recording a program A program memory 56 that is a (Read Only Memory), a working memory 57 that is a work RAM (Random Access Memory) when executing a program, and a timer circuit 58 that generates a signal (clock signal) at a constant interval. And with adjusting the power supplied from the power source 62 at a constant voltage, the power supply is cut when the power required, and a power supply control circuit 59 for performing control to suppress power consumption. The LSI 51 is not limited to one chip, and may be a board on which a plurality of chips are mounted or an MCP (Multi Chip Package).

  As shown in FIG. 6B, the external appearance of the sensor network terminal 50 is divided into an antenna 60, a sensor network terminal 50 main body, and a sensor 61. On the sensor network terminal 50 main body, an LSI 51, a power source 62, and the like. Is provided.

  Examples of the identification information recorded in the identification information recording circuit 54 include identification information unique to the sensor network terminal 50, identification information of the object to which the sensor network terminal 50 is attached, and attributes thereof.

  FIG. 7 is a diagram showing an example of a block configuration and an appearance image of the base station terminal according to the embodiment of the present invention. As illustrated in FIG. 7A, the base station terminal 70 includes an LSI 71, an antenna 80 that transmits and receives data to and from the sensor network terminal 50, a network connection device 81 that is connected to the network 9, and a power source 62. The LSI 71 is connected to the antenna 80 and controls the transmission / reception of data to / from the sensor network terminal 50, the wireless transmission / reception circuit 72, the controller circuit 73, and information related to the position measurement of the sensor network terminal 50 (specifically, the transmission / reception time of the wireless packet). And wireless electric field intensity) and coil identification information, a position and identification information recording circuit 74 that is a nonvolatile memory (for example, a flash memory), and a network interface circuit that controls transmission and reception of data with the network 9 in accordance with a network protocol. 75, a program memory 76, a working memory 77, a timer circuit 78, and a power supply control circuit 79.

  As shown in FIG. 7B, the external appearance of the base station terminal 70 is divided into an antenna 80, a base station terminal 70 main body, and a network connection device 81. On the base station terminal 70 main body, an LSI 71 and a power source are separated. 82 is provided.

  In the above description, a detailed description of the parts common to the sensor network terminal 50 (same names) is omitted.

The block diagram of an example of an equipment diagnosis system. The figure which shows an example of the timing which strain data and a sensor network terminal transmit data. The figure regarding an example of the precision of the angle when attaching a sensor network terminal to a pump or a motor. Explanatory drawing of an example of the aspect which attaches a sensor network terminal to a rotating shaft. FIG. 3 is a configuration explanatory diagram of an example of a wireless network connection according to an embodiment of the present invention. Explanatory drawing of an example of the block structure and external appearance image of the sensor network terminal which concerns on embodiment of this invention. Explanatory drawing of an example of the block configuration and external appearance image of the base station terminal which concerns on embodiment of this invention.

Explanation of symbols

12 System controller 13 Control information DB
20 Pump 21 Motor 22 Rotating shaft 50 Sensor network terminal 51 LSI
52 wireless transmission / reception circuit 53 controller circuit 54 identification information recording circuit 55 A / D conversion circuit 56 program memory 57 working memory 58 timer circuit 59 power supply control circuit 60 antenna 61 sensor 62 power supply 70 base station terminal 71 LSI
72 wireless transmission / reception circuit 73 controller circuit 74 position and identification information recording circuit 75 network interface control circuit 76 program memory 77 working memory 78 timer circuit 79 power supply control circuit 80 antenna 81 network connection device 82 power supply 9 network

Claims (6)

  A strain sensor that is deformed by vibration and a power source composed of an element that generates power by vibration are formed, and a sensor network terminal that is attached to a casing of a pump or a motor to measure the strain amount, and the strain amount measured by the sensor network terminal is wirelessly transmitted. An antenna for transmission, a base station terminal that receives data transmitted wirelessly, and a system control device that analyzes the data received by the base station terminal, a pump or a waveform from a distortion amount obtained by analysis Equipment diagnosis system characterized by detecting motor frequency.   A strain sensor that is deformed by vibration and a power source composed of an element that generates electricity by vibration are formed. A sensor network terminal that is attached to a rotating part of a pump or a motor to measure the strain amount, and the strain amount measured by the sensor network terminal is wirelessly transmitted. An antenna for transmitting data, a base station terminal for receiving data transmitted wirelessly, and a system controller for analyzing the data received by the base station terminal, and pumping from the waveform of distortion obtained by analysis Or the equipment diagnostic system characterized by detecting the frequency of the rotation part of a motor. In the equipment diagnosis system according to claim 1 or 2,
An equipment diagnosis system characterized by determining deterioration of a pump or a motor from a detected change in frequency.   A pump characterized in that a sensor network terminal formed with a strain sensor that is deformed by vibration and a power source composed of an element that generates electricity by vibration is attached to a casing or a rotating part.   A motor characterized in that a sensor network terminal formed with a strain sensor that is deformed by vibration and a power source composed of an element that generates electricity by vibration is attached to a casing or a rotating part.   A strain waveform obtained by analyzing a strain amount measured with a sensor net terminal attached to the casing or rotating part of a pump or motor formed with a strain sensor deformed by vibration and a power source consisting of an element that generates electricity by vibration. A system control device for detecting a frequency of a pump or a motor or a rotating part thereof.

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