A novel smoke exhaust fan operation status monitoring device

Abstract

This invention provides a novel device for monitoring the operating status of a smoke exhaust fan, comprising: a three-axis acceleration measurement module for real-time acquisition of acceleration data of the smoke exhaust fan along three spatial coordinate axes; a microprocessor, employing a low-power microprocessor chip, connected to the three-axis acceleration measurement module for processing the acquired acceleration data to determine the operating status of the smoke exhaust fan; a wireless radio frequency module, connected to the microprocessor, for transmitting the determined operating status data of the smoke exhaust fan; and a power supply voltage regulation module, connected to a battery power supply, for outputting a stable DC voltage to provide power to the various components of the device; wherein, the three-axis acceleration measurement module has a preset alarm threshold, which is used to send an interrupt request to the microprocessor when the measured data exceeds the limit, waking up the microprocessor to respond to the interrupt request. This invention solves the technical problem in the prior art that relying solely on voltage and current detection cannot accurately determine the operating status of smoke exhaust fan equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of fire equipment monitoring technology, and in particular to a novel smoke exhaust fan operation status monitoring device. Background Technology

[0002] Smart fire protection establishes a comprehensive smart fire protection platform for enterprises and governments by integrating automatic fire alarm equipment, electrical fire monitoring equipment, smart smoke detectors, and smart fire water systems. The system comprehensively utilizes technologies such as the Internet of Things (IoT), GIS, and digital video surveillance to achieve real-time monitoring of various signals, including fire alarms, surveillance, and faults, from connected units.

[0003] Smoke exhaust fans are a crucial component of fire-fighting smoke extraction systems. Their function is to quickly remove toxic fumes and heat generated during a fire, facilitating evacuation and fire rescue operations while mitigating the thermal effects on the building structure. However, currently, the operational status of smoke exhaust fans relies primarily on scheduled maintenance and manual inspection. This approach has several drawbacks, such as high labor costs, untimely inspections, and difficulty in monitoring the equipment's operational status in real time.

[0004] Currently, the normal operating status of exhaust fan equipment is mainly determined by detecting the power supply voltage at both ends of the exhaust fan and the current during operation. However, in actual use, it has been found that even if the exhaust fan equipment malfunctions, the power supply voltage at both ends of the exhaust fan may still be normal, and current may still flow through the exhaust fan coil winding. This makes it very difficult to determine the operating status of the exhaust fan equipment and makes it impossible to accurately and promptly detect equipment failures. Utility Model Content

[0005] The purpose of this invention is to provide a novel smoke exhaust fan operation status monitoring device, which solves the technical problem that the operation status of smoke exhaust fan equipment cannot be accurately determined by relying solely on voltage and current detection in the prior art.

[0006] Utility model solution:

[0007] This utility model provides a novel exhaust fan operation status monitoring device, comprising: a three-axis acceleration measurement module for real-time acquisition of acceleration data of the exhaust fan along three spatial coordinate axes; a microprocessor, employing a low-power microprocessor chip capable of operating in low-power sleep mode, connected to the three-axis acceleration measurement module for processing the acquired acceleration data to determine the exhaust fan's operation status; a wireless radio frequency module connected to the microprocessor for transmitting the determined exhaust fan operation status data; and a power supply voltage regulation management module connected to a battery power supply for voltage regulation management to provide regulated power output to various components of the device; wherein, the three-axis acceleration measurement module has a preset alarm threshold, which is used to send an interrupt request to the microprocessor when the measured data exceeds the limit, waking up the microprocessor to respond to the interrupt request and enter the data processing flow.

[0008] Furthermore, the microprocessor is used to process the collected acceleration data, specifically including calculating the three-axis oscillation frequency of the exhaust fan through the collected data, or calculating its three-axis oscillation frequency and air attitude to determine the operating status of the exhaust fan.

[0009] Furthermore, the SPI interface of the chip of the triaxial acceleration measurement module is connected to the IO interface of the microprocessor to realize the reading of acceleration data. The chip of the triaxial acceleration measurement module is provided with an interrupt signal output pin, which is used to send an interrupt signal to the microprocessor when the measurement data exceeds the limit according to a preset alarm threshold.

[0010] Furthermore, the reset pin of the wireless radio frequency module chip is connected to the first part of the pins of the microprocessor chip to receive the reset signal sent by the microprocessor chip; the serial port pin of the wireless radio frequency module chip is connected to the second part of the pins of the microprocessor chip through a jumper to perform serial communication with the microprocessor chip.

[0011] Furthermore, it also includes a level conversion module connected to the PC's serial port; the serial port pins of the wireless radio frequency module chip are also connected to the first part of the pins of the level conversion module chip through the jumper socket, for communicating with the PC and setting the parameters of the wireless radio frequency module chip.

[0012] Furthermore, the jumper socket is connected to the output of the regulated power supply. When an external PC configures the wireless RF module via a serial port, the internal pins of the jumper socket are shorted and connected through jumper caps to power on the level conversion module.

[0013] Furthermore, it also includes a voltage monitoring circuit, which includes a series resistor for dividing the battery power supply. The divided voltage is connected to the channel of the A / D converter of the microprocessor chip for processing the conversion result to obtain voltage data.

[0014] Furthermore, the voltage monitoring circuit includes resistors connected in series with the same resistance value. The voltage after voltage division is connected to multiple channels of the A / D converter of the microprocessor chip. It is used to calculate the arithmetic average value after the microprocessor performs A / D conversion on the multi-channel signals to obtain the digital value of the battery voltage. The digital value is then periodically sent to a remote server via a wireless radio frequency module to determine whether the battery needs to be replaced.

[0015] Furthermore, it also includes signal repeaters, and multiple monitoring devices are used, with the multiple monitoring devices communicating with a remote server through the signal repeaters.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] 1. This utility model device is battery powered, so there is no need to provide a dedicated power cord during on-site installation, which makes installation convenient.

[0018] 2. This utility model device adopts a low power consumption design, which ensures long-term use under battery power conditions and extends its service life.

[0019] 3. This utility model device uses wireless radio frequency transmission. The device is normally in a dormant state. When the exhaust fan starts running, the device can be automatically woken up, automatically collect data, automatically determine the operating status of the exhaust fan, and transmit the data to a nearby signal repeater via wireless radio frequency. The signal repeater then transmits the signal to a remote server.

[0020] 4. This utility model device is equipped with a triaxial accelerometer, which can collect real-time data on the triaxial acceleration of the exhaust fan in space. Through calculation, the triaxial oscillation frequency and aerial attitude of the exhaust fan can be accurately determined, thereby accurately diagnosing whether the exhaust fan is operating normally.

[0021] 5. The field signal repeater and various monitoring devices of this utility model are networked via wireless radio frequency (RF) to achieve point-to-multipoint management. Using RF networking eliminates the need for cumbersome wiring. The RF networking and data transmission method is simple and reliable. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the first part of the circuit of the operating status monitoring device provided in this embodiment;

[0024] Figure 2 This is a schematic diagram of the second part of the circuit of the operating status monitoring device provided in this embodiment;

[0025] Figure 3 The circuit diagram of the third part of the operation status monitoring device provided in this embodiment. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] This embodiment provides a novel smoke exhaust fan operation status monitoring device. Please refer to... Figure 1-3As shown, the device includes: a three-axis acceleration measurement module for real-time acquisition of acceleration data of the exhaust fan along three spatial axes; a microprocessor, employing a low-power microprocessor chip capable of operating in low-power sleep mode, connected to the three-axis acceleration measurement module, for processing the acquired acceleration data to determine the exhaust fan's operating status; a wireless radio frequency module, connected to the microprocessor, for transmitting the determined exhaust fan operating status data; and a power supply voltage regulation management module, connected to the battery power supply, for voltage regulation management to provide regulated power output to various components of the device; wherein, the three-axis acceleration measurement module has a preset alarm threshold, used to send an interrupt request to the microprocessor when the measured data exceeds the limit, waking up the microprocessor to respond to the interrupt request and enter the data processing flow.

[0030] Specifically, the device uses a triaxial acceleration measurement module (U3 / ADXL345) to collect real-time triaxial acceleration data of the exhaust fan. A low-power microprocessor (U1 / MSP430F147) is connected to this module via an SPI interface. When processing data, it combines preset alarm thresholds. When the ADXL345 chip detects that the data exceeds the limit, it sends an interrupt to wake up the microprocessor (operating in low-power sleep mode). The operating status is determined by calculating the oscillation frequency and spatial attitude. Then, the status data is sent by the wireless radio frequency module (U4 / F8L10C) through the jumper JP1 to communicate with the microprocessor serially. The battery power supply is combined with the power supply voltage regulation management module (U5 / XC6204) for power supply. This solution solves the problem that traditional methods of identifying mechanical faults based solely on voltage and current cannot be used by combining data monitoring, low power consumption and wireless transmission. It also improves the accuracy of fault identification and battery life, while making the data transmission technology simple and reliable.

[0031] In this embodiment, the microprocessor is used to process the collected acceleration data, specifically including calculating the three-axis oscillation frequency of the exhaust fan through the collected data, or calculating its three-axis oscillation frequency and air attitude to determine the operating status of the exhaust fan.

[0032] Specifically, the microprocessor (U1 / MSP430F147) collects triaxial acceleration data through the triaxial acceleration measurement module (U3 / ADXL345), and determines the operating status of the exhaust fan by calculating the triaxial oscillation frequency of the exhaust fan, or by calculating its triaxial oscillation frequency and air attitude. In addition, the above two calculation methods can refer to the existing algorithms based on acceleration-based mechanical vibration and attitude.

[0033] In this embodiment, the SPI interface of the chip of the triaxial acceleration measurement module is connected to the IO interface of the microprocessor to realize the reading of acceleration data. The chip of the triaxial acceleration measurement module is provided with an interrupt signal output pin, which is used to send an interrupt signal to the microprocessor when the measurement data exceeds the limit according to a preset alarm threshold.

[0034] Specifically, the ADXL345 chip (U3) of the three-axis acceleration measurement module connects to the I / O interface of the microprocessor (U1 / MSP430F147) via the SPI interface to read data. When the preset acceleration threshold is exceeded, an interrupt is sent to the microprocessor to trigger the processing flow. This design uses an interrupt wake-up mechanism to make the microprocessor sleep normally and only activate it when there is a fault, which reduces power consumption while ensuring real-time monitoring and solves the contradiction between low power consumption and real-time performance.

[0035] In this embodiment, the reset pin of the wireless radio frequency module chip is connected to the first part of the pins of the microprocessor chip to receive the reset signal sent by the microprocessor chip; the serial port pin of the wireless radio frequency module chip is connected to the second part of the pins of the microprocessor chip through a jumper to perform serial communication with the microprocessor chip.

[0036] Specifically, the reset pin 28 of the wireless RF module (U4 / F8L10C) is connected to pin 20 of the microprocessor (U1 / MSP430F147) to receive the reset signal. Its serial port pins 7 and 8 are connected to the serial port pins 32 and 33 of the microprocessor through the JP1 jumper to establish a communication link and realize wireless data transmission. This hardware reset and serial communication design ensures the stable operation of the wireless module. Combined with the jumper, it realizes plug-and-play and simplifies the networking structure by eliminating the need for a traditional gateway.

[0037] In this embodiment, a level conversion module is also included, which is connected to the serial port of a PC. The serial port pins of the wireless radio frequency module chip are also connected to the first part of the pins of the level conversion module chip through the jumper socket, for communicating with the PC and setting the parameters of the wireless radio frequency module chip.

[0038] Specifically, the device connects to the PC's serial port CT2 via pins 14 and 13 of the RS232 level conversion chip (U6). Pins 11 and 12 of U6 are connected to pins 7 and 8 of the serial port of the wireless RF module (U4 / F8L10C) via pins 5-6 and 7-8 of JP1, enabling the PC to configure the wireless module parameters. This level conversion and jumper circuit is designed to support on-site debugging, eliminating the need for additional equipment to improve maintainability. Furthermore, U6 saves power when powered off, balancing functionality and power consumption, and demonstrating innovative hardware flexibility.

[0039] In this embodiment, the jumper socket is connected to the output of the regulated power supply. When an external PC configures the wireless radio frequency module via a serial port, the internal pins of the jumper socket are shorted and connected through jumper caps to power on the level conversion module.

[0040] Specifically, pin 9 of JP1 is connected to the regulated output of the power supply regulator chip (U5 / XC6204) at 3.3V, and pin 11 is connected to the negative terminal of the battery. During debugging, pins 9-10 and 11-12 are shorted to power the RS232 level conversion chip (U6). Normally, the circuit is disconnected to prevent U6 from working. The power supply is controlled by a mechanical jumper to achieve "on-demand activation", which reduces power consumption and extends battery life compared to continuous power supply, and solves the contradiction between debugging requirements and low power consumption.

[0041] In this embodiment, a voltage monitoring circuit is also included. The voltage monitoring circuit includes a series resistor for dividing the battery power supply. The voltage after voltage division is connected to the channel of the A / D converter of the microprocessor chip for processing the conversion result to obtain voltage data.

[0042] Specifically, the voltage monitoring circuit divides the battery voltage through series resistors R2 and R3, and connects to the A / D channel (pins 59, 60, 61, and 2) of the microprocessor (U1 / MSP430F147). After sampling, the average value is calculated and multiplied by 2 to obtain the digital value of the battery voltage. This multi-channel sampling and voltage division calculation accurately monitors the voltage, provides data support for battery replacement, ensures continuous operation of the device, and is a fundamental innovation in electrical parameter monitoring, improving system reliability.

[0043] In this embodiment, the voltage monitoring circuit includes resistors connected in series with the same resistance value. The voltage after voltage division is connected to multiple channels of the A / D converter of the microprocessor chip. It is used to calculate the arithmetic average value after the microprocessor performs A / D conversion on the multi-channel signals to obtain the digital value of the battery voltage. The digital value is then periodically sent to a remote server via a wireless radio frequency module to determine whether the battery needs to be replaced.

[0044] Specifically, since R2 and R3 have the same resistance value, the voltage is divided and connected to the four A / D channels of the microprocessor (U1 / MSP430F147). The sampled arithmetic mean is calculated and then multiplied by 2 to obtain the battery voltage. The voltage is periodically sent to the server via the wireless radio frequency module (U4 / F8L10C) to determine whether the battery needs to be replaced. This multi-channel sampling reduces errors and, combined with wireless transmission, enables remote power monitoring, avoiding monitoring failure due to insufficient power.

[0045] In this embodiment, a signal repeater is also included. Multiple monitoring devices are used, and the multiple monitoring devices communicate with a remote server through the signal repeater.

[0046] Specifically, the device forms a "one-to-many" wireless network with multiple monitoring units through a signal repeater. The repeater aggregates data from each monitoring device and forwards it to a remote server. It uses wireless radio frequency technology to eliminate the need for wiring, supports flexible expansion, and is suitable for complex scenarios such as multi-story buildings. It enables centralized management and improves the systematicness and scalability of fire monitoring.

[0047] Specific examples are explained below:

[0048] See appendix Figure 1 :

[0049] U1 is a microprocessor chip (CPU model MSP430F147), which can operate in a low-power mode. Pins 1 and 64 of U1 are connected to the power supply VCC, and pins 62 and 63 of U1 are connected to the power supply ground. Pins 59, 60, 61, and 2 of U1 are input channels 0 to 3 of the on-chip A / D converter. The microprocessor samples these four pins for A / D conversion, adds up the conversion results, divides by four, and obtains the arithmetic mean. This voltage value is the voltage division value of resistors R2 and R3. Since the resistance values ​​of R2 and R3 are the same, multiplying the arithmetic mean of the A / D sampling conversion by 2 gives the battery voltage.

[0050] Pins 12 and 13 of U1 are connected to pins 8 and 9 of chip U3, which is a triaxial acceleration measurement chip. Pins 8 and 9 of U3 can provide interrupt signals to the CPU. Pin 21 of U1 is connected to the negative terminal of LED D1. It is active low, which makes LED D1 light up. The flashing of this LED indicates the operating status of the device. Pins 8 and 9 of U1 are connected to a crystal oscillator.

[0051] Pin 58 of U1 is connected to pin 2 of U2. U2 is a reset chip (model MAX809). When U2 is powered on, pin 8 outputs a reset signal, which is active low. This signal provides a power-on reset signal for U1. At the same time, this reset signal is connected to pin 6 of plug-in CT1 to provide a power-on reset signal for external program download and debugging equipment. Pins 54, 55, 56, and 57 of U1 are the programming and debugging ports of the CPU, which are connected to plug-in CT1 to download and debug external programs.

[0052] Pin 20 of U1 is connected to pin 28 of U4 to reset U4. Pins 32 and 33 of U1 are connected to pins 3 and 1 of jumper JP1, respectively. Pins 1 and 2 of JP1 are connected together, and pins 3 and 4 are connected together, so that pins 32 and 33 of U1 are connected to pins 7 and 8 of U4, respectively. Pins 32 and 33 of U1 are the CPU serial port, and pins 7 and 8 of U4 are the serial port of the wireless RF chip. The connection between the CPU serial port and the serial port of the wireless RF chip allows the CPU to receive and send data through the wireless RF chip.

[0053] CPU pins 24, 25, 26, and 27 are connected to U3 pins 7, 14, 13, and 12, respectively. U3 is a triaxial acceleration measurement chip. Pins 7, 14, 13, and 12 of U3 are the chip's SPI interface. The CPU connects to the U3 chip's SPI interface through the I / O interface to read the chip's triaxial acceleration measurement data.

[0054] See appendix Figure 2 :

[0055] Resistors R2 and R3 divide the battery voltage. The divided voltage is then connected to pins 59, 60, 61, and 2 of U1. These four pins are input channels 0 to 3 of the CPU's on-chip A / D converter. The CPU samples these four pins for A / D conversion, adds the conversion results together, and divides by four to obtain the arithmetic mean. Since R2 and R3 have the same resistance value, the arithmetic mean of the A / D sample conversion multiplied by 2 is the battery voltage. The battery voltage is sampled periodically and the data is transmitted to a remote server. We can determine whether the battery needs to be replaced based on the measured battery voltage data.

[0056] U3 is a triaxial acceleration measurement chip (model ADXL345). Pins 7, 14, 13, and 12 of U3 are the chip's SPI interface. The CPU connects to the SPI interface of the U3 chip through the I / O interface to read the triaxial acceleration measurement data of the chip. Pins 8 and 9 of U3 are interrupt signal output pins. U3 can be preset with alarm values. When the exhaust fan is turned on, if the measured data exceeds the limit, the triaxial acceleration measurement chip U3 will automatically send an interrupt to the CPU through pins 8 and 9. The CPU will automatically respond to the interrupt request, measure the triaxial acceleration value, determine the operating status of the exhaust fan, and send the status data out through the wireless radio frequency chip U4.

[0057] U5 is a power supply regulator chip (model XC6204). CT3 is an external battery power socket. The positive terminal of the battery voltage is connected to pin 1 of U5. Pin 3 of U5 is the chip enable pin, which is active high. Pin 2 of U5 is connected to the negative terminal of the battery voltage. Pin 5 of U5 is the chip's regulated output, which stably outputs a 3.3V DC voltage.

[0058] See appendix Figure 3 :

[0059] U4 is a wireless radio frequency chip (model F8L10C). Pin 28 of U4 is the reset pin, which is connected to pin 20 of U1. Pins 7 and 8 of U4 are the chip's serial port, which is connected to pins 32 and 33 of U1 via jumper JP1. The CPU connects to the wireless radio frequency chip through the serial port and receives and sends data through the chip.

[0060] U6 is an RS232 level converter chip, and CT2 is an external RS232 serial port socket connected to the PC's serial port. The PC's serial port is connected to pins 14 and 13 of U6 via pins 1 and 2 of CT2. Pins 11 and 12 of U6 are connected to pins 5 and 7 of JP1. A jumper cap is used to connect pins 5 and 6 of JP1, and then to pins 7 and 8 of JP1. The PC's serial port signal is received via CT2, level converted by U6, selected by JP1, and then connected to pins 7 and 8 of U4. Pin 8 allows the PC to set parameters of the wireless RF chip U4 via the serial port. Pin 9 of JP1 is connected to the regulated power output of pin 5 of U5. Pin 11 of JP1 is connected to the negative terminal of the battery. Pins 9 and 10 of JP1, and pins 11 and 12 of JP1 are connected via jumper caps. Normally, these connections are not made, and chip U6 does not work. This design is mainly for power saving. Pins 9 and 10 of JP1, and pins 11 and 12 of JP1 are only connected when an external PC needs to set the U4 via the serial port.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A novel exhaust fume fan operating condition monitoring device, characterized by, include: The three-axis acceleration measurement module is used to collect the acceleration data of the exhaust fan on the three coordinate axes in space in real time. The microprocessor, using a low-power microprocessor chip, can operate in a low-power sleep mode and is connected to the triaxial acceleration measurement module to process the collected acceleration data in order to determine the operating status of the exhaust fan. A wireless radio frequency module, connected to the microprocessor, is used to send out the determined operating status data of the exhaust fan; The power supply voltage regulation management module is connected to the battery power supply and is used to perform voltage regulation management to provide regulated power output to various components of the device. The triaxial acceleration measurement module has a preset alarm threshold, which is used to send an interrupt request to the microprocessor when the measured data exceeds the limit, and wake up the microprocessor to respond to the interrupt request and enter the data processing flow.

2. The novel exhaust fan operating condition monitoring device according to claim 1, characterized by, The microprocessor is used to process the collected acceleration data, specifically including calculating the three-axis oscillation frequency of the exhaust fan based on the collected data, or calculating its three-axis oscillation frequency and air attitude to determine the operating status of the exhaust fan.

3. The novel exhaust fan operating condition monitoring device according to claim 1, characterized by, The SPI interface of the chip of the triaxial acceleration measurement module is connected to the I / O interface of the microprocessor to read acceleration data. The chip of the triaxial acceleration measurement module is provided with an interrupt signal output pin, which is used to send an interrupt signal to the microprocessor when the measurement data exceeds the limit according to a preset alarm threshold.

4. The novel exhaust fan operating condition monitoring device according to claim 1, characterized by, The reset pin of the wireless radio frequency module chip is connected to the first part of the pins of the microprocessor chip to receive the reset signal sent by the microprocessor chip; the serial port pin of the wireless radio frequency module chip is connected to the second part of the pins of the microprocessor chip through a jumper to perform serial communication with the microprocessor chip.

5. A novel exhaust fan operating condition monitoring device according to claim 4, characterized in that, It also includes a level conversion module connected to the PC's serial port; the serial port pins of the wireless radio frequency module chip are also connected to the first part of the pins of the level conversion module chip through the jumper socket, for communication with the PC and to set the parameters of the wireless radio frequency module chip.

6. A novel exhaust fan operating condition monitoring device according to claim 5, characterized in that, The jumper socket is connected to the output of the regulated power supply. When an external PC configures the wireless radio frequency module via a serial port, the internal pins of the jumper socket are shorted and connected through jumper caps to power on the level conversion module.

7. A novel exhaust fan operating condition monitoring device according to claim 1, characterized in that, It also includes a voltage monitoring circuit, which includes a series resistor for dividing the battery power supply. The divided voltage is connected to the channel of the A / D converter of the microprocessor chip for processing the conversion result to obtain voltage data.

8. A novel exhaust fan operating condition monitoring device according to claim 7, characterized in that, The voltage monitoring circuit includes resistors connected in series with the same resistance value. The voltage after voltage division is connected to multiple channels of the A / D converter of the microprocessor chip. It is used to calculate the arithmetic average of the multi-channel signals after A / D conversion by the microprocessor to obtain the digital value of the battery voltage. The digital value is then periodically sent to a remote server via a wireless radio frequency module to determine whether the battery needs to be replaced.

9. A novel exhaust fan operating condition monitoring device according to any one of claims 1 to 8, characterized in that, It also includes signal repeaters, and multiple monitoring devices are used. The multiple monitoring devices communicate with a remote server through the signal repeaters.

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