State monitoring device of brush electronic fan

Abstract

The utility model provides a state monitoring device for a brush electronic fan. The state monitoring device comprises a current sensor, a controller, a speed regulating resistor and a relay which are packaged into a whole, the relays comprise a first relay and a second relay which are respectively used for closing a high-speed operation loop and a low-speed operation loop of the brush electronic fan; the current sensor is connected with the speed regulation resistor, monitors a current value in the low-speed operation loop in real time and feeds the current value back to the controller; the current sensor is connected with the fuse, the fuse is connected with the second relay, the fuse is independently arranged and is not packaged with the current sensor, the controller, the speed regulating resistor and the relay, and replacement after fusing is facilitated; the current sensor is further connected with the controller, the controller is connected with the second relay and the first relay, the controller monitors the current in the low-speed operation loop in real time, after the current exceeds a threshold value for a certain time, the controller can cut off the second relay, the fuse is prevented from being fused due to overheating, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of automobiles, and more particularly to a state monitoring device for a brushed electronic fan. Background Art

[0002] Most cars use brushed electronic fans to promote air flow through the radiator. Existing fans usually have multiple speeds to reduce noise during operation. The faster the speed, the louder the noise. Therefore, when there is no high speed requirement, the fan usually runs at a lower speed.

[0003] Brushed electronic fans with multiple speeds are usually connected to a series resistor. When the fan is at a low speed, continuous low-speed operation will cause the series resistor to heat up severely, which will directly lead to a sharp increase in the temperature of the wire and even burn out the fuse in the system. However, since the fuse is not set separately, it cannot be replaced in time, which easily leads to waste. In some cases, due to design or material selection reasons, when the brushed electronic fan motor stops or becomes blocked, the huge heat generated by the rapid increase in current does not prompt the fuse in the system to disconnect in time, thereby causing certain flammable and fusible materials to melt or burn at high temperatures, resulting in safety accidents.

[0004] Therefore, the utility model provides a state monitoring device for a brushed electronic fan capable of monitoring the state of the brushed electronic fan in real time. Utility Model Content

[0005] In view of this, the utility model provides a state monitoring device for a brushless electronic fan, comprising: a current sensor, a controller, a speed regulating resistor, a vibration monitoring module and a relay that are packaged as one, as well as a fuse and a power supply;

[0006] The relay includes a first relay and a second relay, wherein the response time of the first relay is shorter than the response time of the second relay, and the sensitivity of the first relay is higher than the sensitivity of the second relay; wherein the output end of the first relay is electrically connected to the brushed electronic fan, the first input end of the first relay is electrically connected to the negative pole of the power supply, and the second input end of the first relay is electrically connected to the first output end of the controller; the output end of the second relay is electrically connected to the brushed electronic fan, the first input end of the second relay is electrically connected to the output end of the fuse, and the second input end of the second relay is electrically connected to the second output end of the controller;

[0007] The output end of the fuse is electrically connected to the first input end of the second relay, and the input end of the fuse is electrically connected to the first output end of the current sensor;

[0008] The first output terminal of the controller is electrically connected to the input terminal of the first relay, the second output terminal of the controller is electrically connected to the input terminal of the second relay, and the input terminal of the controller is electrically connected to the second output terminal of the current sensor;

[0009] The vibration monitoring module includes an acceleration sensor, the input end of the acceleration sensor is connected to the brushed electronic fan, and the output end of the acceleration sensor is electrically connected to the positive electrode of the power supply;

[0010] The positive electrode of the power supply is connected to the output end of the acceleration sensor, the negative electrode of the power supply is connected to the first input end of the first relay, and the negative electrode of the power supply is electrically connected to the input end of the speed regulating resistor.

[0011] Optionally, it also includes a packaging shell and a circuit board. The packaging shell is a tetrahedron structure, and the circuit board is embedded in the packaging shell; the current sensor, controller, speed regulating resistor, vibration monitoring module and relay are all welded to the circuit board.

[0012] Optionally, an alarm is further included, and the alarm is electrically connected to the first output terminal of the current sensor.

[0013] Optionally, the rotation speed of the second relay is between 1 rpm and 100 rpm; the rotation speed of the first relay is between 101 rpm and 3000 rpm.

[0014] Optionally, the adjustable resistance of the speed regulating resistor is 30 kΩ-60 kΩ.

[0015] Optionally, the first relay is one of a static relay, a solid-state relay and a mechanical relay; the second relay is one of a temperature relay, an electromagnetic relay and a time relay.

[0016] Optionally, the current sensor is one of a resistance shunt, a Rogowski coil current sensor, a Hall current sensor, an electromagnetic current transformer and an electronic current transformer.

[0017] Optionally, the fuse is one of a temperature fuse and a current limiting fuse.

[0018] Optionally, the holding temperature of the fuse is 60°C-80°C; the limit temperature of the fuse is 100°C-160°C.

[0019] Optionally, the acceleration sensor is one of a piezoelectric acceleration sensor, a piezoelectric integrated circuit sensor, and a micro-electromechanical system acceleration sensor.

[0020] Compared with the prior art, the state monitoring device for a brushless electronic fan provided by the present invention achieves at least the following beneficial effects:

[0021] The utility model provides a state monitoring device for a brushed electronic fan, comprising: a current sensor, a controller, a speed regulating resistor, a vibration monitoring module, and a relay, all packaged together, as well as a fuse and a power supply. The relays include a first relay and a second relay, respectively closing a high-speed operation circuit and a low-speed operation circuit of the brushed electronic fan. The input end of the current sensor is connected to the output end of the speed regulating resistor, and the current sensor monitors the current value in the low-speed operation circuit in real time and feeds the current value back to the controller. The output end of the current sensor is connected to the input end of the fuse, and the output end of the fuse is connected to the second relay. The fuse is provided separately and is not packaged with the current sensor, controller, speed regulating resistor, and relay, making it easy to replace after it blows. The vibration monitoring module includes an acceleration sensor, which is connected to the brushed electronic fan to monitor the vibration frequency of the electronic fan, further enabling vibration detection of the brushed electronic fan and enhancing fault detection capabilities. The output end of the current sensor is also connected to the input end of the controller, and the output end of the controller is connected to the second relay and the first relay. The controller monitors the current in the low-speed operation circuit in real time via the current sensor. If the current exceeds a threshold for a certain period of time, the controller can disconnect the relay to prevent overheating and melting of the fuse, thereby avoiding accidents and improving safety.

[0022] Of course, any product implementing the present utility model does not necessarily need to achieve all the technical effects described above at the same time.

[0023] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 This is a circuit diagram of a state monitoring device for a brushed electronic fan provided by the utility model;

[0026] Figure 2 This is a circuit diagram of another state monitoring device for a brushless electronic fan provided by the present invention;

[0027] 1-power supply, 2-brush electronic fan, 100-relay, 3-second relay, 4-first relay, 5-speed regulating resistor, 6-current sensor, 7-fuse, 8-controller, 90-vibration monitoring module, 9-accelerometer, 10-alarm. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0032] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] Example 1

[0034] The utility model provides a state monitoring device for a brushless electronic fan, referring to Figure 1 , including: a current sensor 6, a controller 8, a speed regulating resistor 5, a vibration monitoring module 90 and a relay 100 that are packaged as one, and also includes a fuse 7 and a power supply 1;

[0035] The relay 100 includes a first relay 4 and a second relay 3. The response time of the first relay 4 is shorter than the response time of the second relay 3, and the sensitivity of the first relay 4 is higher than the sensitivity of the second relay 3. The output end of the first relay 4 is connected to the brushed electronic fan 2, the first input end of the first relay 4 is electrically connected to the negative electrode of the power supply 1, and the second input end of the first relay 4 is electrically connected to the first output end of the controller 8. The output end of the second relay 3 is connected to the brushed electronic fan 2, the first input end of the second relay 3 is electrically connected to the output end of the fuse 7, and the second input end of the second relay 3 is electrically connected to the second output end of the controller 8.

[0036] The input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, the first output end of the current sensor 6 is connected to the input end of the fuse 7, and the second output end of the current sensor 6 is electrically connected to the input end of the controller 8;

[0037] The output end of the fuse 7 is electrically connected to the first input end of the second relay 3 , and the input end of the fuse 7 is electrically connected to the first output end of the current sensor 6 ;

[0038] A first output terminal of the controller 8 is electrically connected to an input terminal of the first relay 4, a second output terminal of the controller 8 is electrically connected to an input terminal of the second relay 3, and an input terminal of the controller 8 is electrically connected to a second output terminal of the current sensor 6; a vibration monitoring module 90 includes an acceleration sensor 9, an input terminal of the acceleration sensor 9 is connected to the brushed electronic fan 2, and an output terminal of the acceleration sensor 9 is electrically connected to the positive electrode of the power supply 1;

[0039] The positive electrode of the power supply 1 is connected to the output end of the acceleration sensor 9 , the negative electrode of the power supply 1 is connected to the input end of the speed regulating resistor 5 , and the negative electrode of the power supply 1 is connected to the first input end of the first relay 4 .

[0040] Specifically, the present invention provides a state monitoring device for a brushless electronic fan, comprising: a current sensor 6, a controller 8, a speed regulating resistor 5, a vibration monitoring module 90 and a relay 100, which are packaged as one body, and further comprising a fuse 7 and a power supply 1;

[0041] The relay 100 includes a first relay 4 and a second relay 3. The response time of the first relay 4 is shorter than the response time of the second relay 3, and the sensitivity of the first relay 4 is higher than the sensitivity of the second relay 3. The output end of the first relay 4 is connected to the brushed electronic fan 2, the first input end of the first relay 4 is electrically connected to the negative electrode of the power supply 1, and the second input end of the first relay 4 is electrically connected to the first output end of the controller 8. The output end of the second relay 3 is connected to the brushed electronic fan 2, the first input end of the second relay 3 is electrically connected to the output end of the fuse 7, and the second input end of the second relay 3 is electrically connected to the second output end of the controller 8.

[0042] It should be noted that the relay 100 includes a first relay 4 and a second relay 3. The first relay 4 is a high-speed relay that mainly controls the switch through the magnetic field in the electromagnet. When an external current passes through the excitation coil, the iron core is attracted by the magnetic field and magnetized, thereby causing the contacts on the iron core to make contact or disconnect with the fixed contacts. The second relay 3 is a low-speed relay that mainly realizes the switching of the control circuit by switching a mechanical switch. Its internal mechanical structure is actuated by the current to control the closing or disconnection of the contacts. Therefore, the second relay 3 has the characteristics of durability and stability. The brushed electronic fan 2 mainly plays a cooling role. During operation, it usually includes two states: low-speed operation and high-speed operation. The closing of the two operating circuits is mainly realized by the second relay 3 and the first relay 4.

[0043] It should be noted that the input ends of the relay 100 are connected to the controller 8, and the controller 8 controls the closing and opening of the switch of the relay 100. The output end of the first relay 4 is connected to the brushed electronic fan 2, forming a closed loop when the brushed electronic fan 2 needs to run at high speed; the output end of the second relay 3 is connected to the brushed electronic fan 2, forming a closed loop when the brushed electronic fan 2 needs to run at low speed, thereby realizing the operation of the brushed electronic fan 2 in different modes.

[0044] It should be noted that the primary advantage of brushed electronic fans 2 as cooling fans is their low cost. However, the brushes and commutator in this fan's construction result in high contact resistance, which can easily increase the overall resistance of the motor and lead to overheating. Furthermore, due to friction between the brushes and commutator, the motor may need to be opened and cleaned after a period of use. The current work of brushed electronic fans 2 is primarily converted into heat energy.

[0045] The input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, the first output end of the current sensor 6 is connected to the input end of the fuse 7, and the second output end of the current sensor 6 is electrically connected to the controller 8. The current sensor 6 feeds back the monitored current to the controller 8 in real time. The controller 8 can control the closing or opening of the relay 100, adjust the operating state of the brush electronic fan 2 in time, and realize the state monitoring of the brush electronic fan 2; the output end of the fuse 7 is connected to the second relay 3, and the input end of the fuse 7 is electrically connected to the current sensor 6; the output end of the current sensor 6 is also connected to the input end of the controller 8, and the output end of the controller 8 is connected to the second relay 3 and the first relay 4; the positive pole of the power supply 1 is connected to the brush electronic fan 2, and the negative pole of the power supply 1 is connected to the first relay 4 and the input end of the speed regulating resistor 5.

[0046] It should be noted that the low-speed operation of the brushed electronic fan 2 is achieved by the second relay 3 and the speed regulating resistor 5. The current sensor 6 is connected in series to the low-speed operation circuit of the brushed electronic fan 2, and its input end is connected to the output end of the speed regulating resistor 5, providing a structural basis for realizing the function of real-time monitoring of the current in the circuit; the fuse 7 is connected to the current sensor 6 and is independently set. It is not packaged together with the current sensor 6, the controller 8, the speed regulating resistor 5 and the relay 100. If the fuse 7 blows after a long period of low-speed operation or other circumstances, it can be replaced to avoid the need to replace the brushed electronic fan 2 due to the blowing of the fuse 7; the positive pole of the power supply 1 is connected to the brushed electronic fan 2, and the positive pole of the power supply 1 is connected to the brushed electronic fan 2. The negative pole is connected to the input end of the first relay 4 and the speed regulating resistor 5; when the brush electronic fan 2 needs to run at high speed, the controller 8 controls the first relay 4 to close, and the power supply 1, the first relay 4 and the brush electronic fan 2 form a high-speed operation loop; when the brush electronic fan 2 needs to run at low speed, the controller 8 controls the second relay 3 to close the switch, and the current flows from one end of the power supply 1 to the speed regulating resistor 5, the current sensor 6, the fuse 7, the second relay 3 and the brush electronic fan 2 in sequence, and then merges into the other end of the power supply 1, forming a low-speed operation loop. At the same time, the current sensor 6 is connected to the controller 8, and the controller 8 is connected to the second relay 3, so that the current sensor 6 can monitor the current value in the loop in real time.

[0047] It should be noted that the controller 8 (such as an ECU, Electronic Control Unit) can control the switch of the relay 100 to close the circuit, and at the same time receive feedback from the current sensor 6 and perform timing. When the current monitored by the current sensor 6 reaches a certain value for a certain period of time, the controller 8 controls the relay 100 to disconnect in time to avoid the fuse 7 from melting or other damage caused by excessive temperature. The vibration monitoring module 90 includes an acceleration sensor 9, the input end of which is connected to the brushed electronic fan 2;

[0048] It should be noted that the brushed electronic fan 2 generates vibrations during operation. These vibrations can be caused by a variety of factors, such as fan blade imbalance and motor shaft wear. The accelerometer 9 can monitor the fan's vibrations in real time, including parameters such as frequency and amplitude. By analyzing these parameters, abnormal fan vibrations can be detected promptly, thereby avoiding potential failures and damage. When the fan's vibration exceeds a preset threshold, the accelerometer 9 issues an alarm signal. This fault warning function can significantly reduce the fan's failure rate, extend its service life, and reduce downtime caused by failures.

[0049] It can be understood that the state monitoring device of a brushed electronic fan provided by the present invention includes a current sensor 6, a controller 8, a speed regulating resistor 5 and a relay 100 that are packaged as one; the relay 100 includes a first relay 4 and a second relay 3, which respectively realize the closure of the high-speed operation circuit and the low-speed operation circuit of the brushed electronic fan 2; the input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, and the current sensor 6 monitors the current value in the low-speed operation circuit in real time and feeds back the current value to the controller 8; the output end of the current sensor 6 is connected to the input end of the fuse 7, and the output end of the fuse 7 is connected to the second relay 3. The fuse 7 is set separately and is not packaged with the current sensor 6, the controller 8, the speed regulating resistor 5, so that it is easy to replace after it is blown; the output end of the current sensor 6 is also connected to the input end of the controller 8, and the output end of the controller 8 is connected to the second relay 3 and the first relay 4. The controller 8 monitors the current in the low-speed operation circuit in real time through the current sensor 6. After the current exceeds the threshold for a certain period of time, the controller 8 can cut off the second relay 3 to avoid overheating and melting the fuse 7, avoid accidents, and improve safety.

[0050] Example 2

[0051] This embodiment further illustrates the structure of the state monitoring device for a brushed electronic fan based on the first embodiment.

[0052] The present invention provides a state monitoring device for a brushed electronic fan, which further includes a packaging shell and a circuit board. The packaging shell is a tetrahedron structure, and the circuit board is embedded in the packaging shell. The current sensor, controller, speed regulating resistor, vibration monitoring module 90 and relay 100 are all welded to the circuit board.

[0053] It should be noted that it also includes a packaging shell and a circuit board. The packaging shell is a tetrahedral structure with an internal accommodating space. The circuit board is embedded in the packaging shell. The current sensor, controller, speed regulating resistor, 90 monitoring module and relay 100 are welded to the circuit board. The brushed electronic fan 2 is also arranged in the packaging shell. A hole for the wire to pass through is set on the shell of the packaging shell, and an external fuse 7 and a power supply 1 are connected to facilitate timely replacement of the fuse 7 after it is blown.

[0054] Example 3

[0055] The utility model provides a state monitoring device for a brushless electronic fan, referring to Figure 1-Figure 2 , including: a current sensor 6, a controller 8, a speed regulating resistor 5, a vibration monitoring module 90 and a relay 100 that are packaged as one, and also includes a fuse 7 and a power supply 1;

[0056] The relay 100 includes a first relay 4 and a second relay 3. The response time of the first relay 4 is shorter than the response time of the second relay 3, and the sensitivity of the first relay 4 is higher than the sensitivity of the second relay 3. The output end of the first relay 4 is connected to the brushed electronic fan 2, the first input end of the first relay 4 is electrically connected to the negative electrode of the power supply 1, and the second input end of the first relay 4 is electrically connected to the first output end of the controller 8. The output end of the second relay 3 is connected to the brushed electronic fan 2, the first input end of the second relay 3 is electrically connected to the output end of the fuse 7, and the second input end of the second relay 3 is electrically connected to the second output end of the controller 8.

[0057] The input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, the first output end of the current sensor 6 is connected to the input end of the fuse 7, and the second output end of the current sensor 6 is electrically connected to the input end of the controller 8;

[0058] The vibration monitoring module 90 includes an acceleration sensor 9, the input end of which is connected to the brushed electronic fan 2;

[0059] The positive electrode of the power supply 1 is connected to the output end of the acceleration sensor 9 , and the negative electrode of the power supply 1 is connected to the input end of the speed regulating resistor 5 .

[0060] Specifically, the present invention provides a state monitoring device for a brushless electronic fan, comprising: a current sensor 6, a controller 8, a speed regulating resistor 5, a vibration monitoring module 90 and a relay 100, which are packaged as one body, and further comprising a fuse 7 and a power supply 1;

[0061] The relay 100 includes a first relay 4 and a second relay 3. The response time of the first relay 4 is shorter than the response time of the second relay 3, and the sensitivity of the first relay 4 is higher than the sensitivity of the second relay 3. The output end of the first relay 4 is connected to the brushed electronic fan 2, the first input end of the first relay 4 is electrically connected to the negative electrode of the power supply 1, and the second input end of the first relay 4 is electrically connected to the first output end of the controller 8. The output end of the second relay 3 is connected to the brushed electronic fan 2, the first input end of the second relay 3 is electrically connected to the output end of the fuse 7, and the second input end of the second relay 3 is electrically connected to the second output end of the controller 8.

[0062] It should be noted that the relay 100 includes a first relay 4 and a second relay 3. The first relay 4 is a high-speed relay that mainly controls the switch through the magnetic field in the electromagnet. When an external current passes through the excitation coil, the iron core is attracted by the magnetic field and magnetized, thereby causing the contacts on the iron core to make contact or disconnect with the fixed contacts. The second relay 3 is a low-speed relay that mainly realizes the switching of the control circuit by switching a mechanical switch. Its internal mechanical structure is actuated by the current to control the closing or disconnection of the contacts. Therefore, the second relay 3 has the characteristics of durability and stability. The brushed electronic fan 2 mainly plays a cooling role. During operation, it usually includes two states: low-speed operation and high-speed operation. The closing of the two operating circuits is mainly realized by the second relay 3 and the first relay 4.

[0063] It should be noted that the input ends of the relay 100 are connected to the controller 8, and the controller 8 controls the closing and opening of the switch of the relay 100. The output end of the first relay 4 is connected to the brushed electronic fan 2, forming a closed loop when the brushed electronic fan 2 needs to run at high speed; the output end of the second relay 3 is connected to the brushed electronic fan 2, forming a closed loop when the brushed electronic fan 2 needs to run at low speed, thereby realizing the operation of the brushed electronic fan 2 in different modes.

[0064] It should be noted that the primary advantage of brushed electronic fans as cooling fans is their low cost. However, the brushes and commutator in this fan's construction result in high contact resistance, which can easily increase the overall resistance of the motor and lead to overheating. Furthermore, due to friction between the brushes and commutator, the motor may need to be opened and cleaned after a period of use. The current work of brushed fans is primarily converted into heat energy.

[0065] The input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, the first output end of the current sensor 6 is connected to the input end of the fuse 7, and the second output end of the current sensor 6 is electrically connected to the controller 8. The current sensor 6 feeds back the monitored current to the controller 8 in real time. The controller 8 can control the closing or opening of the relay 100, adjust the operating state of the brush electronic fan 2 in time, and realize the state monitoring of the brush electronic fan 2; the output end of the fuse 7 is connected to the second relay 3, and the input end of the fuse 7 is electrically connected to the current sensor 6; the output end of the current sensor 6 is also connected to the input end of the controller 8, and the output end of the controller 8 is connected to the second relay 3 and the first relay 4; the positive pole of the power supply 1 is connected to the brush electronic fan 2, and the negative pole of the power supply 1 is connected to the first relay 4 and the input end of the speed regulating resistor 5. It should be noted that the low-speed operation of the brushed electronic fan 2 is achieved by relying on the second relay 3 and the speed regulating resistor 5. The current sensor 6 is connected in series to the low-speed operation circuit of the brushed electronic fan 2, and its input end is connected to the output end of the speed regulating resistor 5, providing a structural basis for realizing the function of real-time monitoring of the current in the circuit; the fuse 7 is connected to the current sensor 6 and is independently set. It is not packaged together with the current sensor 6, the controller 8, the speed regulating resistor 5 and the relay 100. If the fuse 7 blows after a long period of low-speed operation or in other circumstances, it can be replaced to avoid the need to replace the brushed electronic fan 2 due to the blowing of the fuse 7. The positive pole of the power supply 1 is connected to the brush electronic fan 2, and the negative pole of the power supply 1 is connected to the input end of the first relay 4 and the speed regulating resistor 5; when the brush electronic fan 2 needs to run at high speed, the controller 8 controls the first relay 4 to close, and the power supply 1, the first relay 4 and the fan form a high-speed operation loop; when the brush electronic fan 2 needs to run at low speed, the controller 8 controls the second relay 3 to close the switch, and the current flows from one end of the power supply 1 to the speed regulating resistor 5, the current sensor 6, the fuse 7, the second relay 3 and the brush electronic fan 2 in sequence, and then merges into the other end of the power supply 1, forming a low-speed operation loop. At the same time, the current sensor 6 is connected to the controller 8, and the controller 8 is connected to the second relay 3, so that the current sensor 6 can monitor the current value in the loop in real time.

[0066] It should be noted that the controller 8 (such as an ECU, Electronic Control Unit) can control the switch of the relay 100 to close the circuit, and at the same time receive feedback from the current sensor 6 and perform timing. When the current monitored by the current sensor 6 reaches a certain value for a certain period of time, the controller 8 controls the relay 100 to disconnect in time to avoid the fuse 7 from melting or other damage caused by excessive temperature. The vibration monitoring module 90 includes an acceleration sensor 9, the input end of which is connected to the brushed electronic fan 2;

[0067] It should be noted that the brushed electronic fan 2 generates vibrations during operation. These vibrations can be caused by a variety of factors, such as fan blade imbalance and motor shaft wear. The accelerometer 9 can monitor the fan's vibrations in real time, including parameters such as frequency and amplitude. By analyzing these parameters, abnormal vibrations of the brushed electronic fan 2 can be detected promptly, thereby avoiding potential failures and damage. When the vibration of the brushed electronic fan 2 exceeds a preset threshold, the accelerometer 9 will issue an alarm signal. This fault warning function can significantly reduce the fan's failure rate, extend its service life, and reduce downtime caused by failures.

[0068] The device further comprises an alarm 10 , which is electrically connected to the first output terminal of the current sensor 6 .

[0069] It should be noted that when the current monitored by the current sensor 6 reaches a certain value for a certain period of time, it means that the current in the circuit is large. The alarm 10 can issue a reminder and send an alarm signal. This fault warning function can significantly reduce the failure rate of the fan, extend its service life, and reduce the downtime caused by failure.

[0070] It can be understood that the state monitoring device of a brushed electronic fan provided by the present invention includes a current sensor 6, a controller 8, a speed regulating resistor 5 and a relay 100 that are packaged as one; the relay 100 includes a first relay 4 and a second relay 3, which respectively realize the closure of the high-speed operation circuit and the low-speed operation circuit of the brushed electronic fan 2; the input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5, and the current sensor 6 monitors the current value in the low-speed operation circuit in real time and feeds back the current value to the controller 8; the output end of the current sensor 6 is connected to the input end of the fuse 7, and the output end of the fuse 7 is connected to the second relay 3. The fuse 7 is set separately and is not packaged with the current sensor 6, the controller 8, the speed regulating resistor 5 and the relay 100, so as to facilitate replacement after the fuse is blown; the output end of the current sensor 6 is also connected to the input end of the controller 8, and the output end of the controller 8 is connected to the second relay 3 and the first relay 4. The controller 8 monitors the current in the low-speed operation circuit in real time through the current sensor 6. After the current exceeds the threshold for a certain period of time, the controller 8 can cut off the second relay 3 to avoid overheating and melting the fuse 7, avoid accidents, and improve safety.

[0071] Example 4

[0072] This embodiment describes the relay 100 in detail based on the third embodiment.

[0073] The rotation speed of the second relay 3 is between 1 rpm and 100 rpm; the rotation speed of the first relay 4 is between 101 rpm and 3000 rpm.

[0074] It should be noted that the first relay 4 is a high-speed relay, primarily controlling its opening and closing via the magnetic field of an electromagnet. When an external current flows through the excitation coil, the core is attracted by the magnetic field and magnetized, causing the contacts on the core to make or break contact with the fixed contacts. This design gives the first relay 4 characteristics such as fast response and high sensitivity. The second relay 3 is a low-speed relay, primarily controlling the opening and closing of the control circuit through the switching of a mechanical switch. Its internal mechanical structure activates under the influence of current, controlling the closing and opening of the contacts, making the second relay 3 durable and stable. The first relay 4 is suitable for electrical control systems that require fast response and frequent operation, while the second relay 3 is suitable for electrical control systems that require long-term stability and low-frequency operation. The operating speed of the second relay 3 is typically low, generally below 100 rpm, and some definitions even specify operating speeds of up to tens of rpm. The operating speed of the first relay 4 is relatively high, typically ranging from hundreds to thousands of rpm. For example, the operating speed range of an electromagnetic speed relay is 500-3000rpm, while that of a photoelectric speed relay is 100-1500rpm.

[0075] Example 5

[0076] This embodiment describes the speed regulating resistor 5 in detail based on the fourth embodiment.

[0077] The adjustable resistance of the speed regulating resistor 5 is 30kΩ-60kΩ.

[0078] It should be noted that the speed regulating resistor 5 changes the current passing through the motor of the brushed electronic fan 2 by changing its resistance value, thereby achieving precise control of the speed of the brushed electronic fan 2. When the resistance value increases, the current decreases and the speed of the brushed electronic fan 2 decreases; conversely, when the resistance value decreases, the current increases and the speed of the brushed electronic fan 2 increases. Therefore, the resistance value of the speed regulating resistor 5 is crucial to the speed control and stability of the fan.

[0079] Optionally, the adjustable resistance of the speed regulating resistor 5 can be 30kΩ, 35kΩ, 38kΩ, 40kΩ, 43kΩ, 45kΩ, 48kΩ, 50kΩ, 52kΩ, 54kΩ, 56kΩ, 58kΩ and 60kΩ. When the adjustable resistance of the speed regulating resistor 5 is less than 30kΩ, the closed loop current is too large and the speed of the brush electronic fan 2 is too large. When the adjustable resistance of the speed regulating resistor 5 is greater than 60kΩ, the closed loop current is too small and the speed of the brush electronic fan 2 is too small, which will cause the series resistor to heat up seriously, directly causing the temperature of the wire to rise sharply, and even the fuse in the system to burn out. Therefore, when the adjustable resistance of the speed regulating resistor 5 is 30kΩ-60kΩ, the normal operation of the brush electronic fan 2 can be guaranteed to a certain extent.

[0080] Example 6

[0081] This embodiment describes the relay 100 , the current sensor 6 , and the fuse 7 in detail based on the fourth embodiment.

[0082] The first relay 4 is one of a static relay, a solid-state relay and a mechanical relay; the second relay 3 is one of a temperature relay, an electromagnetic relay and a time relay.

[0083] It's important to note that static relays use integrated circuits, lacking moving parts and mechanical wear, resulting in a long service life. They require only a few milliwatts of control power, effectively saving energy. Their compact size and footprint make them suitable for use in compact spaces. They accurately activate when the AC voltage crosses zero, reducing radio frequency interference. They are insensitive to mechanical shock and vibration, making them suitable for use in explosive environments. Solid-state relays are contactless electronic switches with isolation functions. They are resistant to vibration and mechanical shock, and are resistant to moisture, mildew, corrosion, and explosion. They offer low noise and a high operating frequency, and are widely used in various control systems. Mechanical relays can isolate high-voltage and low-voltage circuits, protecting them from high-voltage circuits and improving circuit safety and reliability. They can amplify and extend circuit signals, making signal transmission more stable and reliable. They enable automatic control and regulation of circuits, enhancing their intelligence and automation. Temperature relays sense and respond to changes in ambient temperature to control the on / off of circuits. They automatically disconnect circuits when temperatures are abnormal, preventing equipment from overheating and damage. They maintain stable performance in both high and low temperature environments. Electromagnetic relays use low-voltage, low-current circuits to control high-voltage, high-current circuits, ensuring operator safety. They can control the on / off of circuits by electromagnetically closing and opening contacts. Time relays automatically open and close circuits after a set time, providing precise delay control and suitable for applications requiring precise time control. They can also maintain stable performance even in harsh environments.

[0084] The current sensor 6 is one of a resistance shunt, a Rogowski coil current sensor, a Hall current sensor, an electromagnetic current transformer and an electronic current transformer.

[0085] It should be noted that resistive shunts can accurately measure current and provide accurate data, helping to monitor the operating status of fans. Their simple structure makes them easy to integrate into condition monitoring devices. Compared to other types of current sensors, resistive shunts are less expensive and suitable for large-scale applications. Rogowski coil current sensors calculate current by measuring changes in the magnetic field, eliminating the need for direct contact with the current being measured, improving safety and reliability. They can measure currents from microamperes to thousands of amperes, offering high adaptability. They are suitable for high-frequency current measurement and can quickly respond to current changes. Since they have no moving parts, they have a long lifespan and can operate normally in harsh environments. Hall effect current sensors also calculate current by measuring changes in the magnetic field, improving safety and reliability. They offer high measurement accuracy, accurately reflecting the true current value, and are unaffected by factors such as current frequency and waveform, resulting in excellent stability. They can measure current changes in real time and have a high response speed. Electromagnetic current transformers isolate high-voltage and low-voltage circuits, protecting low-voltage circuits from high-voltage circuits. They offer high measurement accuracy and are suitable for various current measurement scenarios. Their structure is stable and reliable, making them less susceptible to external interference. Electronic current transformer; can output digital signals, facilitating communication and integration with digital devices; no saturation phenomenon, excellent anti-electromagnetic interference performance; can meet high-level measurement accuracy requirements, and is not affected by secondary loads.

[0086] The fuse 7 is a temperature fuse or a current limiting fuse.

[0087] It's important to note that a thermal fuse automatically cuts off the circuit when the fan motor overheats, preventing the motor from burning out. It provides reliable temperature protection, improving the fan's reliability and safety. Its compact size makes it easy to integrate into condition monitoring devices. A current-limiting fuse automatically cuts off the circuit when the current is too high, preventing short circuits or overloads and protecting the fan motor and other circuit components from damage caused by current surges. Once a current-limiting fuse blows, it's easy to replace and repair.

[0088] The maintenance temperature of the fuse 7 is 60°C-80°C; the limit temperature of the fuse 7 is 100°C-160°C.

[0089] It should be noted that maintaining the temperature between 60°C and 80°C ensures that the fuse 7 will not blow prematurely due to excessive temperature during normal operation, thereby ensuring the stability and reliability of the circuit. This temperature range also avoids the performance degradation or failure of the fuse 7 that may occur due to excessively low temperature. At an appropriate maintenance temperature, the internal materials and structure of the fuse 7 can maintain good stability and durability, thereby extending its service life. Maintaining a moderate temperature can reduce malfunction of the fuse 7 caused by temperature changes and improve the reliability and stability of the circuit.

[0090] The limit temperature is between 100°C and 160°C, which means that when the current in the circuit is too large or the ambient temperature is too high, causing the temperature of fuse 7 to rise to this range, fuse 7 will melt in time, thereby cutting off the circuit and preventing safety accidents such as overheating and damage to equipment or fire. The limit temperature enables fuse 7 to operate normally under some harsh environmental conditions (such as high temperature environments), improving the adaptability and reliability of the circuit. At a reasonable limit temperature, fuse 7 can melt quickly when necessary, protecting the circuit and equipment from damage, while reducing the safety risks caused by circuit failures.

[0091] The acceleration sensor is one of a piezoelectric acceleration sensor, a piezoelectric integrated circuit sensor, and a micro-electromechanical system acceleration sensor.

[0092] It should be noted that piezoelectric accelerometers are highly accurate and can precisely measure the vibration and acceleration generated by the fan during operation, accurately reflecting the fan's mechanical condition. This sensor has a wide frequency response range, capable of capturing vibration information at various operating frequencies of the brushed electronic fan 2. It can measure a wide range of vibrations, from subtle vibrations to significant accelerations, making it suitable for monitoring brushed electronic fans 2 under various operating conditions. The excellent stability of the piezoelectric material ensures that the sensor maintains high measurement accuracy over long-term use. Piezoelectric integrated circuit sensors integrate the piezoelectric element with signal processing circuitry, simplifying system design and improving reliability. The built-in signal processing circuitry amplifies and filters the sensor's output signal, improving signal accuracy and readability. The integrated circuit design also results in low power consumption, making the sensor suitable for long-term monitoring applications.

[0093] Microelectromechanical system (MEMS) accelerometers are tiny and easily integrated into the compact structure of brushed electronic fans2 without taking up additional space. They offer high precision and sensitivity, accurately measuring minute vibrations and acceleration changes in the fan. Their extremely low power consumption makes them suitable for long-term monitoring, helping to extend the battery life of condition monitoring devices. Some MEMS accelerometers support multi-axis measurement, enabling simultaneous monitoring of the fan's vibration and acceleration information in different directions.

[0094] It can be seen from the above embodiments that the state monitoring device for a brushless electronic fan provided by the present invention achieves at least the following beneficial effects:

[0095] The utility model provides a state monitoring device for a brushed electronic fan, which includes a current sensor 6, a controller 8, a speed regulating resistor 5 and a relay 100 that are packaged as one. The relay 100 includes a first relay 4 and a second relay 3, which respectively realize the closure of the high-speed operation circuit and the low-speed operation circuit of the brushed electronic fan 2. The input end of the current sensor 6 is connected to the output end of the speed regulating resistor 5. The current sensor 6 monitors the current value in the low-speed operation circuit in real time and feeds back the current value to the controller 8. The output end of the current sensor 6 is connected to the input end of the fuse 7, and the output end of the fuse 7 is connected to the second relay 3. The fuse 7 is set separately and is not packaged with the current sensor 6, the controller 8, the speed regulating resistor 5 and the relay 100, so that it is easy to replace after it is blown. The output end of the current sensor 6 is also connected to the input end of the controller 8, and the output end of the controller 8 is connected to the second relay 3 and the first relay 4. The controller 8 monitors the current in the low-speed operation circuit in real time through the current sensor 6. After the current exceeds the threshold for a certain period of time, the controller 8 can cut off the second relay 3 to avoid overheating and melting the fuse 7, avoid accidents, and improve safety.

[0096] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration rather than for limiting the scope of the present invention.

[0097] It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A state monitoring device for a brushless electronic fan, characterized in that: include: The package integrates a current sensor, controller, speed regulating resistor, vibration monitoring module and relay, as well as fuse and power supply; The relay includes a first relay and a second relay, the response time of the first relay is shorter than the response time of the second relay, and the sensitivity of the first relay is higher than the sensitivity of the second relay; wherein, the output end of the first relay is electrically connected to the brushed electronic fan, the first input end of the first relay is electrically connected to the negative pole of the power supply, and the second input end of the first relay is electrically connected to the first output end of the controller; the output end of the second relay is electrically connected to the brushed electronic fan, the first input end of the second relay is electrically connected to the output end of the fuse, and the second input end of the second relay is electrically connected to the second output end of the controller; The input end of the current sensor is connected to the output end of the speed regulating resistor, the first output end of the current sensor is electrically connected to the input end of the fuse, and the second output end of the current sensor is electrically connected to the input end of the controller; The output end of the fuse is electrically connected to the first input end of the second relay, and the input end of the fuse is electrically connected to the first output end of the current sensor; The first output terminal of the controller is electrically connected to the input terminal of the first relay, the second output terminal of the controller is electrically connected to the input terminal of the second relay, and the input terminal of the controller is electrically connected to the second output terminal of the current sensor; The vibration monitoring module includes an acceleration sensor, an input end of the acceleration sensor is electrically connected to the brushed electronic fan, and an output end of the acceleration sensor is electrically connected to the positive electrode of the power supply; The positive electrode of the power supply is connected to the output end of the acceleration sensor, the negative electrode of the power supply is connected to the first input end of the first relay, and the negative electrode of the power supply is electrically connected to the input end of the speed regulating resistor.

2. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: It also includes a packaging shell and a circuit board. The packaging shell is a tetrahedron structure, and the circuit board is embedded in the packaging shell; the current sensor, the controller, the speed regulating resistor, the vibration monitoring module and the relay are all welded to the circuit board.

3. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The device further comprises an alarm, which is electrically connected to the first output terminal of the current sensor.

4. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The rotation speed of the second relay is between 1 rpm and 100 rpm; the rotation speed of the first relay is between 101 rpm and 3000 rpm.

5. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The adjustable resistance of the speed regulating resistor is 30kΩ-60kΩ.

6. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The first relay is one of a static relay, a solid-state relay and a mechanical relay; the second relay is one of a temperature relay, an electromagnetic relay and a time relay.

7. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The current sensor is one of a resistance shunt, a Rogowski coil current sensor, a Hall current sensor, an electromagnetic current transformer and an electronic current transformer.

8. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The fuse is one of a temperature fuse and a current limiting fuse.

9. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The maintenance temperature of the fuse is 60°C-80°C; the limit temperature of the fuse is 100°C-160°C.

10. The state monitoring device for a brushed electronic fan according to claim 1, characterized in that: The acceleration sensor is one of a piezoelectric acceleration sensor, a piezoelectric integrated circuit sensor, and a micro-electromechanical system acceleration sensor.

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