Mixed flow fan motor vibration and temperature on-line monitoring protection device

Abstract

The utility model belongs to the technical field of fan automation, and discloses a mixed flow fan motor vibration and temperature on-line monitoring protection device. According to the device, a temperature sensor and a vibration sensor are installed on a motor body of the mixed flow fan in a magnetic attraction mode, signals of the two sensors are transmitted to a PLC through a data acquisition module, the PLC processes the signals and controls an intermediate relay to cut off a motor power source after comparing the signals with a preset threshold value, and data display, alarm and threshold value setting are achieved through a touch screen. Wherein the temperature sensor and the vibration sensor support various signal inputs through the data acquisition module and communicate with the PLC by using a MODBUSRTU protocol. The device realizes 24-hour real-time monitoring, dual protection and integrated monitoring, saves cost, is convenient to overhaul, disassemble and assemble, and can effectively solve the problems that traditional manual inspection cannot realize real-time monitoring and is large in data error, existing current monitoring protection lags behind and lacks an integrated data processing and early warning mechanism and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fan automation technical field, concretely relates to a kind of on-line monitoring protection device for mixed flow fan motor vibration and temperature. BACKGROUND

[0002] Mixed flow fan is the matching equipment of ventilation and heat dissipation of generator set and workshop environment control, and it is continuously operated in the harsh environment of high temperature, high dust and potential explosive gas for a long time, so the operation state of mixed flow fan is directly related to the energy efficiency and production safety of generator set.The traditional motor monitoring means mainly relies on artificial timing inspection, and the vibration and temperature parameters of motor are measured by handheld device, but this kind of mode has significant defects: on the one hand, artificial inspection is timed and fixed-point operation, and it is difficult to capture the subtle parameter change in the early stage of failure;On the other hand, mixed flow fan motor is usually installed in the inside of air duct, and the parts need to be disassembled when artificial measurement is carried out, so the operation is inconvenient and the measurement position is not fixed, which leads to large data error and cannot accurately reflect the real operation state of motor.

[0003] At present, the protection device of mixed flow fan motor mainly monitors current, and sets current tripping threshold value by motor protector.However, this protection mode has obvious hysteresis.For example, when the motor has bearing wear, mechanical imbalance and other faults, the initial vibration value is usually high and the temperature gradually rises, and the current change is not significant, so the protection action cannot be triggered.As the fault intensifies, the bearing may suddenly be stuck, which leads to motor rotor scanning, winding burning, and even equipment damage when motor protector trips.

[0004] In addition, the existing monitoring system lacks integrated data processing and early warning mechanism.The scattered sensor measuring points cannot realize centralized collection and analysis of data, and the operation and maintenance personnel cannot obtain the whole picture of the operation state of multiple devices in time, and cannot predict the occurrence of failure according to historical data.Therefore, how to design a low-cost and simple-to-reform on-line monitoring protection device to realize real-time monitoring of mixed flow fan motor vibration and temperature, centralized data processing and fault early warning has become a problem to be solved after mixed flow fan is put into operation. UTILITY MODEL CONTENTS

[0005] In view of the problems in the background art, the utility model provides an on-line monitoring protection device for mixed flow fan motor vibration and temperature.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of online monitoring protection device of mixed flow fan motor vibration and temperature, temperature sensor and vibration sensor are respectively magnetically attracted and installed on the mixed flow fan motor body, and the signal output end of two sensors is connected with the signal input end of PLC controller respectively through data acquisition module, the signal output end of PLC controller is electrically connected with the input end of intermediate relay, the output end of intermediate relay is connected with the trip loop normally open contact of mixed flow fan, PLC controller processes temperature signal and vibration signal transmitted by data acquisition module and compares with preset threshold value after being output control instruction to intermediate relay, intermediate relay is cut off motor power when receiving control instruction.

[0007] As the further explanation and limitation of the above technical scheme, the temperature sensor is three-wire PT100 temperature sensor, and the output temperature signal is analog quantity;The vibration sensor is industrial vibration sensor, and the output dynamic signal is 420mA current signal.

[0008] As the further explanation and limitation of the above technical scheme, the data acquisition module is Poly Ying DAM-AT24 data acquisition module, supports 12-way three-wire PT100 temperature signal input and 12-way 4-20mA analog signal input, and is connected with PLC controller by MODBUSRTU protocol.

[0009] As the further explanation and limitation of the above technical scheme, the PLC controller is modular programmable controller with at least 1 RS485 interface and 1 Ethernet interface, supports MODBUSRTU / TCP protocol, and is used for receiving temperature vibration signal of data acquisition module and outputting trip instruction.

[0010] As the further supplementary explanation of the above technical scheme, it further includes touch screen, and the PLC controller is connected with touch screen by Ethernet communication connection through network cable, for transmitting temperature vibration data and threshold setting instruction.

[0011] As the further explanation and limitation of the above technical scheme, the temperature sensor, vibration sensor and data acquisition module are connected through aviation plug, and the aviation plug is arranged on the air duct and cable end of mixed flow fan respectively, for realizing quick disassembly and reliable connection of sensor.

[0012] As the further explanation and limitation of the above technical scheme, the PLC controller is integrated in the existing cabinet empty position of low-voltage distribution room, and the cable between data acquisition module and PLC controller adopts KVVP shielded cable, and the shielding layer is single-ended grounded.

[0013] Compared with prior art, the utility model has the following advantages:

[0014] 1.The utility model discloses an integrated magnetic attraction type sensor and automatic control module, the sensor is connected with the data acquisition module through the aviation plug, and the double protection scheme is designed by combining vibration, temperature and other parameters with PLC logic control, which makes up for the hysteresis defect of traditional current monitoring. When the motor has early abnormalities such as bearing failure, the change of vibration acceleration or temperature will reach the threshold value earlier than the current, and the PLC can timely trigger the intermediate relay to cut off the power supply, avoiding serious consequences such as rotor sweep bore and winding burnout caused by fault aggravation.

[0015] 2.The utility model discloses an integrated partition management of data acquisition module through touch screen centralized display, which realizes integrated monitoring of multiple fan operating states. The temperature and vibration data of the fan are transmitted to the PLC in real time through the 485 communication protocol and dynamically displayed on the touch screen in partition pictures, and the operation and maintenance personnel can one-key switch the monitoring area, query historical data or modify the tripping threshold value. At the same time, the system supports hierarchical permission management of threshold parameters, avoids misoperation, greatly improves the operation and maintenance efficiency, and a single person can complete the equipment monitoring task under the traditional multiple manual conditions.

[0016] 3.The utility model utilizes the existing cabinet empty position of low-voltage distribution room to install the PLC controller, and replaces the traditional hard-wired with 485 communication, which saves the cable usage and further reduces the total transformation cost. In addition, the data acquisition module reserves 4 spare channels, which can be compatible with the monitoring requirements of subsequent new equipment, and the magnetic attraction type sensor and aviation plug are designed for easy maintenance and disassembly, providing a practical solution for similar industrial technology transformation in the industry. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure and wiring diagram of the online monitoring protection device in the utility model;

[0018] Figure 2 It is the fan partition display interface diagram of the touch screen in the utility model embodiment.

[0019] In the figure, the mixed flow fan is 1, the temperature sensor is 2, the vibration sensor is 3, the data acquisition module is 4, the PC controller is 5, the intermediate relay is 6, and the touch screen is 7. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical scheme of the utility model, the following is according to the implementation process of this project transformation, combined with the attached Figures 1-2 The utility model is further described.

[0021] As attached Figure 1As shown, an online monitoring protection device for vibration and temperature of a mixed flow fan motor mainly comprises a temperature sensor 2 and a vibration sensor 3, a data acquisition module 4, a PLC controller 5, an intermediate relay 6 and a cable with an aviation plug. Each electronic device used above is sourced from outsourcing, and the specific procurement parameter requirements are as follows: the temperature sensor 2 is a three-wire PT100 temperature sensor, and the output temperature signal is an analog quantity; the vibration sensor 3 is an industrial vibration sensor, and the output dynamic signal is a 420mA current signal. The data acquisition module 4 is a Poly-Eng DAM-AT24 data acquisition module, which supports 12-way three-wire PT100 temperature signal input and 12-way 4-20mA analog signal input, and is connected with the PLC controller in communication through the MODBUS RTU protocol. The PLC controller 5 is a modular programmable controller with at least one RS485 interface and one Ethernet interface, supports the MODBUS RTU / TCP protocol, is used for receiving the temperature vibration signal of the data acquisition module 4 and outputting a trip instruction. The touch screen 7 is embeddedly installed in a first-stage a cabinet control room, supports real-time data display and threshold setting.

[0022] The specific installation mode of the online monitoring protection device is as follows: three-wire PT100 temperature sensors 2 are fixed on the front and rear bearing shell surfaces of the mixed flow fan motor 1 body through magnetic bases, to ensure that the temperature measurement points are close to the bearing heat source; an industrial level vibration sensor 3 outputting a 4-20 mA signal is installed near the motor end cover or bearing seat through magnetic attraction. The sensor cable is connected to the outside of the mixed flow fan duct through an aviation plug, and the other end of the aviation plug is connected to the cable end of the data acquisition module 4, that is, the PT100 temperature sensor 2 is connected to the CH1-CH12 channel of the data acquisition module through a KVVP shielded cable, and the shielded layer is single-ended grounded on the control cabinet side to suppress electromagnetic interference. The vibration sensor is connected to the AI1-AI12 channel of the module through a 2-core KVVP cable, and the temperature signal is branched and transmitted. In this way, the connection mode realizes "plug and play" type quick disassembly and assembly, and there is no need to disconnect the wire during maintenance. The data acquisition module 4 is installed in two partitions in the field control cabinet: the No. 1 module is connected to the 12-way temperature signal and the 6-way vibration signal of the first phase 1-6 fan; the No. 2 module is connected to the 10-way temperature signal, 5-way vibration signal and 1-way environment temperature signal of the second phase 7-11 fan. The data acquisition module 4 is connected with the PLC controller 5 through the RS485 bus, MODBUSRTU protocol is adopted, baud rate is set to 9600, data bits are 8 bits, stop bits are 1 bit, and there is no check to ensure stable and reliable data transmission. The PLC controller 5 is connected with the touch screen 7 through the CAT.5e network cable to establish ModbusTCP connection, real-time data transmission and threshold setting instruction receiving. The PLC controller 5 uses the existing cabinet side space of the low-voltage distribution room to form a cabinet through the DIN rail installation, 2-way RS485 interface is connected with the data acquisition module, and 2-way independent network ports are connected with the plant-level monitoring system and the touch screen 7 respectively. The touch screen 7 is embeddedly installed in the first phase a cabinet control room, supports real-time data display and threshold setting. The intermediate relay 6 is installed in the PLC control cabinet, the input end is connected with the PLC output point, and the output end is connected in series to the normally open contact of the motor tripping circuit, and is used for executing the power-off instruction. When the PLC detects that the parameter exceeds the standard, a DC24V level signal is output to trigger the intermediate relay coil, and after the normally open contact is closed, the motor tripping circuit is connected, which is used for controlling the circuit breaker to trip and power off.

[0023] As shown in the accompanying Figure 2 , we will combine the touch screen to explain the specific operation process: the touch screen displays the first phase / second phase fan data in split screen, supports historical curve query, and the environment temperature is displayed on the top of the picture. When the monitoring data exceeds the threshold, the touch screen alarms, the PLC synchronously records the fault time, parameter value and fan number, and triggers the tripping instruction. At the same time, after the operation and maintenance personnel input the three-level permission password, the threshold can be modified in real time on the touch screen, and the modification record is automatically stored in the PLC log.

[0024] In order to ensure that the skilled person can accurately understand and implement, to reach the same effect of modification. For this purpose, we further disclose the various types of sensors and cable specification parameters list used in the project modification:

[0025] Device name Model / specification Parameter Temperature sensor Three-wire PT100 Accuracy ±0.3°C, temperature measurement range -200~650°C, IP65 protection Vibration sensor CA-YD-185 Magnetic mounting, 4-20mA output, measurement range 0-50g, frequency response 10-1000Hz Data acquisition module Poly Ying DAM-AT24 24-way input (12-way PT100+12-way analog), supports MODBUS RTU, DC 7-30V power supply PLC controller Blue Pian RPC3105 2x RS485+2x network interface, supports Modbus RTU / TCP, maximum expansion 40000 points IO, built-in PID algorithm Touch screen MCGS TP C7062KX 7-inch 800x480 touch screen, with RS485 / network interface, supports configuration picture partition switching Intermediate relay Ohm MY2NJ Coil voltage DC24V, contact capacity AC220V / 5A, response time ≤10ms Communication cable KVVP - 41.5 mm 2 ]] Copper core shielded cable, single-ended grounding resistance ≤4Ω .

[0026] The main features and advantages of the present application are shown and described above, for those skilled in the art, it is clear that the specific embodiments of the present application are not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present application, the inventive idea and design idea of the present application can be realized in other specific forms, should be equivalent to the protection scope disclosed in the technical scheme of the present application. Therefore, from any point of view, the examples should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0027] In addition, it should be understood that although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An online monitoring and protection device for vibration and temperature of a mixed-flow fan motor, comprising a mixed-flow fan (1), characterized in that, Temperature sensor (2) and vibration sensor (3) are magnetically mounted on the motor body of the mixed flow fan (1), and the signal output terminals of the two sensors are connected to the signal input terminal of the PLC controller (5) through the data acquisition module (4). The signal output terminal of the PLC controller (5) is electrically connected to the input terminal of the intermediate relay (6). The output terminal of the intermediate relay (6) is connected to the normally open contact of the trip circuit of the mixed flow fan (1). The PLC controller (5) processes the temperature signal and vibration signal transmitted by the data acquisition module (4) and compares them with the preset threshold before outputting a control command to the intermediate relay (6). When the intermediate relay (6) receives the control command, it cuts off the motor power supply.

2. The online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to claim 1, characterized in that, The temperature sensor (2) is a three-wire PT100 temperature sensor, and its output temperature signal is an analog signal; the vibration sensor (3) is an industrial-grade vibration sensor, and its output dynamic signal is a 420mA current signal.

3. The online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to claim 1, characterized in that, The data acquisition module (4) is a Juying DAM-AT24 data acquisition module, which supports 12 three-wire PT100 temperature signal inputs and 12 4-20mA analog signal inputs, and communicates with the PLC controller through the MODBUSRTU protocol.

4. The online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to claim 1, characterized in that, The PLC controller (5) is a modular programmable controller with at least one RS485 interface and one Ethernet interface, supporting the MODBUSRTU / TCP protocol, used to receive temperature and vibration signals from the data acquisition module (4) and output trip commands.

5. The online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to claim 4, characterized in that, It also includes a touch screen (7), and the PLC controller (5) and the touch screen (7) establish an Ethernet communication connection through a network cable to transmit temperature vibration data and threshold setting instructions.

6. An online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to any one of claims 1 to 5, characterized in that, The temperature sensor (2), vibration sensor (3) and data acquisition module (4) are connected by an aviation plug. The aviation plug is respectively set on the air duct and cable end of the mixed flow fan (1) to realize the quick disassembly and reliable connection of the sensor.

7. The online monitoring and protection device for vibration and temperature of a mixed-flow fan motor according to claim 6, characterized in that, The PLC controller (5) is integrated into the existing cabinet space in the low-voltage power distribution room. The cable between the data acquisition module (4) and the PLC controller (5) is a KVVP shielded cable with the shielding layer grounded at one end.

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