Fan operation monitoring method and system and fan system

Abstract

The invention discloses a fan operation monitoring method and system and a fan system. The fan operation monitoring system comprises a current monitoring module used for monitoring the main loop current of the fan in real time; the control module is connected to the current detection module in a sampling mode and used for judging that the main loop current is abnormal when the draught fan is in the state that the operation condition is met and the main loop current is smaller than or equal to a first set current threshold value. The current detection module responds to the abnormity of the main loop current and continuously monitors the abnormal main loop current within preset time, so that the control module confirms that the fan breaks down; and the alarm module is connected to the control module and is used for receiving an alarm signal after the control module judges that the fault signal of the fan occurs. The fault state of the cooling fan can be effectively monitored, the timely recognition rate of the fan fault is improved, the running probability of the fan with the fault is reduced, and therefore the thermal runaway probability of equipment is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fan monitoring, and in particular to a fan operation monitoring method, system and fan system. Background Art

[0002] With the rapid development of the energy storage industry, the capacity of single battery compartments is constantly increasing, and the capacity of the supporting booster integrated unit is also constantly increasing. The heat generated by the booster integrated unit is also increasing. In order to keep the integrated unit at the allowable operating ambient temperature and avoid thermal runaway accidents, it is necessary to dissipate heat in a timely manner. The main heat dissipation method of the booster integrated unit is the circulating air of the cooling fan and air cooling. The cooling fan is installed on the outer shell of the integrated unit cabin, and the ambient temperature in the cabin is monitored in real time by using a temperature controller. Once the temperature exceeds the preset range, the temperature controller will start the cooling fan to circulate the air in the cabin and exchange it with the ambient air outside the cabin to cool the cabin. When the temperature reaches a safe level, the cooling fan will stop working.

[0003] As the capacity of the booster unit continues to increase, its heat generation is also increasing. The heat dissipation effect of its own heat dissipation is negligible compared to its very large heat dissipation demand. Its heat dissipation is mainly achieved by forced circulation of air through the heat dissipation fan. This places high demands on the reliability of its heat dissipation fan operation. Once the heat dissipation fan fails and the booster unit is still in operation, the unit is likely to experience thermal runaway, which will cause fire, explosion, personal injury and other accidents. However, the current air-cooled heat dissipation solution for the all-in-one unit only has intelligent start and stop control of the three fans, and there is no monitoring measure for the working status and failure of the heat dissipation fan. Often when the heat dissipation fan fails, it is difficult for the equipment operation and maintenance personnel to detect and repair it in time. The booster unit runs with a fan failure, which has a great risk of accidents. Summary of the invention

[0004] The embodiments of the present application provide a fan operation monitoring method, system and fan system, which are used to solve the technical problem that there are currently no monitoring measures for the working status of the cooling fan and whether there is a fault, and it is impossible to timely issue an early warning and remind equipment operation and maintenance personnel to repair the faulty fan, resulting in the risk of accidents for the equipment.

[0005] The present application provides a fan operation monitoring system, including:

[0006] Current monitoring module, used to monitor the main circuit current of the fan in real time;

[0007] A control module, connected to the current detection module for sampling, is used to determine that the main circuit current is abnormal when the fan is in a state that meets the operating conditions and the main circuit current is less than or equal to a first set current threshold; the current detection module responds to the abnormality of the main circuit current and continuously monitors the abnormal main circuit current within a preset time, so that the control module confirms that the fan is faulty;

[0008] The alarm module is connected to the control module and is used to output an alarm signal after receiving a signal from the control module that a fan failure has occurred.

[0009] Furthermore, the control module is also used to control the alarm signal output by the alarm module to reset itself when receiving a signal from the current detection unit that the main circuit current is greater than a second set current threshold after the alarm module outputs the alarm signal.

[0010] Furthermore, the control module is also used to control the fan to start when the ambient temperature inside the equipment is greater than or equal to a set temperature threshold.

[0011] Furthermore, the control module includes a fan temperature control linkage control circuit; the fan temperature control linkage control circuit is serially provided with a fan start and stop control output contact of the thermostat and a normally open main contact of the first AC contactor. When the ambient temperature inside the equipment is greater than or equal to a set temperature threshold, the thermostat sends a command signal to start the fan, and the normally open main contact of the first AC contactor closes to control the fan to start. When the ambient temperature inside the equipment is lower than the set temperature threshold, the fan does not start.

[0012] Furthermore, the current monitoring module is a current monitoring circuit, and the auxiliary contacts of the first AC contactor, the fuse, the current transformer, the alarm contacts of the current relay and the fan are connected in series on the current monitoring circuit. When the main circuit current is less than or equal to a first set current threshold, it is determined that an abnormal signal appears in the main circuit current. In response to the abnormal signal, if the current sensed by the current transformer is still less than or equal to the first set current threshold within a preset time, it is confirmed that the fan has a fault; if the current sensed by the current transformer recovers to be greater than the second set current threshold within the preset time, no alarm signal is issued.

[0013] Furthermore, the alarm module includes a fan fault signal expansion and alarm circuit, and the fan fault signal expansion and alarm circuit is provided with a first branch connected in series by the auxiliary normally open contact of the first AC contactor and the alarm signal output contact of the current relay, and the fan fault signal expansion and alarm circuit is also provided with a second branch connected in series by a manual alarm signal reset button and the normally open auxiliary contact of the first intermediate relay, the first branch is connected in parallel with the second branch, and the first branch is connected in series with the coil of the first intermediate relay to form a self-holding circuit, and the second branch is connected in series with the coil of the first intermediate relay to form a reset circuit; the fan fault signal expansion and alarm circuit also includes a fan fault sound and light alarm circuit connected in series by the normally open auxiliary contact of the first intermediate relay and the sound and light alarm light.

[0014] Furthermore, the alarm module also includes a fan fault indication circuit, which is provided with a fan fault indication circuit consisting of an auxiliary normally open contact of the first AC contactor, an alarm signal output contact of the current relay and a fault indicator light connected in series; the fan fault indication circuit is also provided with a fan fault indication self-locking circuit consisting of a coil of an eleventh intermediate relay and a normally open auxiliary contact of the eleventh intermediate relay in series; wherein the coil of the eleventh intermediate relay is connected in parallel with the fault indicator light.

[0015] Furthermore, the alarm module also includes a fan fault upload circuit, and a measurement and control device is provided on the fan fault upload circuit. The device power supply contacts of the measurement and control device are connected to the control power supply through a protection switch, and the normally open auxiliary contacts of the first intermediate relay are connected in series with the switch quantity collection contacts of the measurement and control device. The measurement and control device is used to upload the fault status of the fan to the background system.

[0016] An embodiment of the present application also provides a fan system, which includes a fan and the above-mentioned fan operation monitoring system.

[0017] The present application provides a method for monitoring fan operation, comprising the following steps:

[0018] Real-time monitoring of the main circuit current of the fan;

[0019] When the fan is in a state that meets the operating conditions and the main circuit current is less than or equal to the first set current threshold, it is determined that an abnormal signal occurs in the main circuit current;

[0020] In response to an abnormal signal, the abnormal signal is continuously monitored within a preset time. If the main circuit current is still less than or equal to the first set current threshold within the preset time, it is confirmed that the fan is faulty;

[0021] Output alarm signal.

[0022] Furthermore, after the step of outputting the alarm signal, the method further includes: when it is monitored that the main circuit current is greater than a second set current threshold, the alarm signal is reset automatically.

[0023] Furthermore, the step of outputting the alarm signal also includes uploading the alarm signal to a remote background system.

[0024] The fan operation monitoring method, system and fan system provided in the embodiments of the present application can effectively monitor the fault status of the cooling fan, improve the timely identification rate of fan faults, reduce the probability of operation of the fan with faults, and thus reduce the probability of thermal runaway of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0026] Figure 1 A schematic diagram of the structure of a fan temperature control linkage control circuit provided in an embodiment of the present application.

[0027] Figure 2 A schematic diagram of the structure of a current relay power supply circuit provided in an embodiment of the present application.

[0028] Figure 3 A schematic diagram of the structure of a current monitoring circuit provided in an embodiment of the present application.

[0029] Figure 4 A schematic diagram of the structure of a fan fault signal expansion and alarm circuit provided in an embodiment of the present application.

[0030] Figure 5 A schematic diagram of the structure of a fan fault indication circuit provided in an embodiment of the present application.

[0031] Figure 6 A schematic diagram of the structure of a fan fault upload circuit provided in an embodiment of the present application.

[0032] Figure 7 A schematic diagram of the steps of a fan operation monitoring method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The present embodiment provides a fan operation monitoring system, including four parts: a current monitoring module, a temperature monitoring module, a control module and an alarm module, wherein the current detection module is used to monitor the main circuit current. As for the connection relationship between the modules, the control module samples and connects the current detection module and the temperature detection module, and controls and connects the alarm module. When the ambient temperature in the device reaches the set temperature threshold, the fan is controlled to start, and when the main circuit current meets the judgment condition when the fan is in a state of satisfying the operating conditions, the alarm module is controlled to output an alarm signal, specifically: when the main circuit current of the fan is less than or equal to the first set current threshold, it indicates that the fan stops rotating, and it is determined that the fan fails, such as a stall or a fan circuit fails, and the alarm module is controlled to output an alarm signal. Among them, judging whether the fan start-up condition is met according to the level of the ambient temperature in the device is only a specific implementation method, and the present invention is not limited to this method, and the above-mentioned control step of controlling the fan start-up belongs to conventional technical means, and this part may not be included in the entire control process. In this case, the system does not need to include a temperature detection module.

[0036] In this embodiment, the first set current threshold is set to 80% of the rated current of the fan, that is, the judgment condition becomes whether the current threshold is less than or equal to 80% of the rated current of the fan. When the current threshold is less than or equal to 80% of the rated current of the fan, it means that the fan does not work when it should work, and it is judged that the fan is abnormal. In response to the abnormality, the current detection module continuously monitors the current of the main circuit where the abnormality occurs within a preset time, so that the control module confirms that the fan is faulty. The preset time is set to 5s, that is, the delay is 5s, and the delay time of 5s is reserved to allow the fan to be in a stable operating state and avoid malfunction. After the delay of 5s, the abnormality does not disappear, and then it is determined that the fan has a fault. After the alarm signal is output, when the main circuit current is monitored to be greater than the second set current threshold, the alarm signal is reset. The second set current threshold is set to 96% of the rated current of the fan. When the current threshold is greater than 96% of the rated current of the fan, it means that the fan is working again, and the fan is judged to be back to normal, and the control alarm signal is reset.

[0037] The control module can be a control chip, or an integrated circuit composed of control chips, which is mainly controlled by an internal software program. Of course, the control module can also be a specific circuit structure, and the control function is realized by the circuit connection relationship between each circuit and component. In this embodiment, the control module takes a specific circuit structure as an example.

[0038] like Figure 1-Figure 6 As shown, KA1, KA11-KA22 are intermediate relays, HY1-HY12 are signal indicator lights, BJ1 is an audible and visual alarm light, SB1 and SB2 are reset buttons, In is a measurement and control device, QIJ1-QIJ12 are current relays, KGDY1 are switching power supplies, WK1 is a temperature controller, 1CG / 2CG are temperature sampling sensors for the temperature controller, KM1 is an AC contactor, FJ1-FJ12 are fans, FU1-FU12 are fuses, and ZK1-ZK6 are protection switches.

[0039] like Figure 1-Figure 2 As shown, the control module includes a fan temperature control linkage control circuit and a current relay power supply circuit. The fan temperature control linkage control circuit is connected in series with the fan start and stop control output contact of the thermostat WK1 and the normally open main contact of the first AC contactor KM1. When the ambient temperature in the equipment is greater than or equal to the set temperature threshold, the thermostat WK1 sends a command signal for the fan to start, and the normally open main contact of the first AC contactor KM1 closes to control the fan to start. When the ambient temperature in the equipment is less than the set temperature threshold, the fan does not start.

[0040] The auxiliary normally open contact of the first AC contactor KM1 and the switch power supply KGDY1 are connected in series on the current relay power supply circuit. The first current relay QIJ1 to the twelfth current relay QIJ12 are all connected in parallel with the branch connected in series with the first AC contactor KM1 and the switch power supply KGDY1. After the fan is started, the current relay is operated to avoid false alarms when the fan is not working. The switch power supply KGDY1 only provides power for the relay.

[0041] like Figure 3 As shown, the current monitoring module is a current monitoring circuit. Among them, the current monitoring circuit is provided with a first fan branch consisting of a first current transformer, a first fuse FU1, an alarm contact of a first current relay QIJ1 and a first fan FJ1 in series, and the first fan branch is connected in series with an auxiliary contact of the first AC contactor KM1. The current transformer senses current from the main circuit, and the characteristic of the current relay QIJ1 is: when the current sensed by the current transformer is greater than a certain value, that is, when the current of the main bus circuit is greater than the set value of the current relay QIJ1, the current relay QIJ1 is energized.

[0042] In this embodiment, twelve fans are included. The second fan branch composed of the second current transformer, the second fuse FU2, the alarm contact of the second current relay QIJ2 and the second fan FJ2 connected in series is connected in parallel with the first fan branch, and the third fan branch to the twelfth fan branch are all connected in parallel with the first fan branch.

[0043] In this embodiment, the current relay QIJ1 monitors the main circuit current in real time. When the main circuit current is less than or equal to the first set current threshold, that is, when the main circuit current is less than or equal to 80% of the rated current of the main circuit, it is determined that the main circuit current has an abnormal signal. In this embodiment, the first current relay QIJ1 adopts an undercurrent delay type current relay. In response to the abnormal signal, if the current sensed by the current transformer is still less than or equal to 80% of the rated current of the main circuit within the preset time of 5s, it is confirmed that the fan has a fault; within the preset time of 5s, if the current sensed by the current transformer is restored to greater than 96% of the rated current of the main circuit, no alarm signal is issued. The alarm contact of the first current relay QIJ1 is connected in series with the auxiliary contact of the first AC contactor KM1, and a fan fault signal is generated when it is confirmed that the fan has a fault. It can effectively monitor the fault state of the heat dissipation fan, improve the timely identification rate of the fan fault, reduce the probability of the fan running with a fault, and thus reduce the probability of thermal runaway of the equipment.

[0044] like Figure 4-Figure 6 As shown, the alarm module includes a fan fault signal expansion and alarm circuit, a fan fault indication circuit and a fan fault upload circuit.

[0045] The fan fault signal expansion and alarm circuit is provided with a first branch connected in series by the auxiliary normally open contact of the first AC contactor KM1 and the alarm signal output contact of the first current relay QIJ1. When the fan is started, the fan fault alarm circuit can be operated to prevent false alarms. The fan fault signal expansion and alarm circuit is also provided with a second branch connected in series by the manual alarm signal reset button SB1 and the normally open auxiliary contact of the first intermediate relay KA1. The first branch is connected in parallel with the second branch, and the first branch is connected in series with the coil of the first intermediate relay KA1 to form a self-holding circuit. The second branch is connected in series with the coil of the first intermediate relay KA1 to form a reset circuit. The alarm signal output contact of the second current relay QIJ2 to the alarm signal output contact of the twelfth current relay QIJ12 are all connected in parallel with the alarm signal output contact of the first current relay QIJ1.

[0046] The fan fault signal expansion and alarm circuit also includes a fan fault sound and light alarm circuit consisting of the normally open auxiliary contact of the first intermediate relay KA1 and the sound and light alarm lamp BJ1 in series. The normally open auxiliary contact of the first intermediate relay KA1 is self-locking to maintain the alarm signal. When it is confirmed that the fan has a fault and forms a fan fault signal, the alarm signal output contact of the current relay is transmitted to the first intermediate relay KA1, and an alarm signal is issued through the sound and light alarm lamp BJ1. The fault status of the fan is fed back locally through the sound and light alarm lamp to support local operation and maintenance.

[0047] The fan fault indication circuit is provided with a first fan fault indication circuit which is connected in series by the auxiliary normally open contact of the first AC contactor KM1, the alarm signal output contact of the first current relay QIJ1 and the first fault indicator light HY1. When the fan is started, the fan fault alarm circuit is enabled to work to prevent false alarms. The fan fault indication circuit is also provided with a first fan fault indication self-locking circuit which is connected in series by the coil of the eleventh intermediate relay KA11 and the normally open auxiliary contact of the eleventh intermediate relay KA11. Among them, the coil of the eleventh intermediate relay KA11 is connected in parallel with the first fault indicator light HY1. The first fault indicator light HY1 is connected in series with the fan alarm signal, and when the fan fails, a corresponding light indication signal is issued. The fan fault indication circuit is also provided with a second fan fault indication circuit to a twelfth fan fault indication circuit and a second fan fault indication self-locking circuit to a twelfth fan fault indication self-locking circuit.

[0048] The fan fault upload circuit is equipped with a measurement and control device In, which is used to upload the fan fault status to the background system. The device power supply contact of the measurement and control device In is connected to the control power supply L6 / N6 through the protection switch ZK6, and the normally open auxiliary contact of the first intermediate relay KA1 is connected in series with the switch quantity collection contact of the measurement and control device In to realize the remote collection of the fan fault signal. It can effectively monitor the fault status of the equipment cooling fan, and upload the fault status of the fan to the background system in time to support remote operation and maintenance.

[0049] This embodiment also provides a fan system, including a fan and the above-mentioned fan operation monitoring system. The fan belongs to the prior art, and the fan operation monitoring system has been described in detail in the above-mentioned fan operation monitoring system embodiment, so it will not be described in detail here.

[0050] This embodiment also provides a fan operation monitoring method, such as Figure 7 As shown, monitoring methods include:

[0051] Step 110: Real-time monitoring of the main circuit current;

[0052] Step 120: When the fan is in a state that meets the operating conditions and the main circuit current is less than or equal to the first set current threshold, it is determined that an abnormal signal appears in the main circuit current;

[0053] Step 130: In response to the abnormality of the signal, continuously monitor the abnormal signal within a preset time. If the main circuit current is still less than or equal to the first set current threshold within the preset time, it is confirmed that the fan is faulty;

[0054] Step 140: Output an alarm signal and upload the alarm signal to a remote background system;

[0055] Step 150: When the main circuit current is detected to be greater than the second set current threshold, the alarm signal is reset automatically.

[0056] In step 130, if the current sensed by the current transformer recovers to be greater than the second set current threshold within the preset time, it is confirmed that the fan has not failed and no alarm signal is issued.

[0057] The above is a fan operation monitoring method, system and fan system provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fan operation monitoring system, characterized in that: include: Current monitoring module, used to monitor the main circuit current of the fan in real time; A control module, connected to the current detection module for sampling, for determining that the main circuit current is abnormal when the fan is in a state that meets the operating conditions and the main circuit current is less than or equal to a first set current threshold; The current detection module continuously monitors the abnormal main circuit current within a preset time in response to the abnormal main circuit current, so that the control module confirms that the fan fails; The alarm module is connected to the control module and is used to receive an alarm signal outputted by the control module after determining that a fan failure occurs.

2. The fan operation monitoring system according to claim 1, characterized in that: The control module is also used to control the alarm signal output by the alarm module to reset itself when receiving a signal from the current detection unit that the main circuit current is greater than a second set current threshold after the alarm module outputs the alarm signal.

3. The fan operation monitoring system according to claim 2, characterized in that: The control module is also used to control the fan to start when the ambient temperature in the equipment is greater than or equal to a set temperature threshold.

4. The fan operation monitoring system according to claim 3, characterized in that: The control module includes a fan temperature control linkage control circuit; the fan temperature control linkage control circuit is serially provided with a fan start and stop control output contact of a thermostat and a normally open main contact of a first AC contactor. When the ambient temperature inside the equipment is greater than or equal to a set temperature threshold, the thermostat sends a command signal for the fan to start, and the normally open main contact of the first AC contactor closes to control the fan to start. When the ambient temperature inside the equipment is less than the set temperature threshold, the fan does not start.

5. The fan operation monitoring system according to claim 4, characterized in that: The current monitoring module includes a current monitoring circuit, on which the auxiliary contacts of the first AC contactor, the fuse, the current transformer, the alarm contacts of the current relay and the fan are connected in series. When the main circuit current is less than or equal to a first set current threshold, it is determined that an abnormal signal appears in the main circuit current. In response to the abnormal signal, if the current sensed by the current transformer is still less than or equal to the first set current threshold within a preset time, it is confirmed that the fan has a fault; if the current sensed by the current transformer recovers to be greater than the second set current threshold within the preset time, no alarm signal is issued.

6. The fan operation monitoring system according to claim 5, characterized in that: The alarm module includes a fan fault signal expansion and alarm circuit, and the fan fault signal expansion and alarm circuit is provided with a first branch connected in series by the auxiliary normally open contact of the first AC contactor and the alarm signal output contact of the current relay, and the fan fault signal expansion and alarm circuit is also provided with a second branch connected in series by a manual alarm signal reset button and the normally open auxiliary contact of the first intermediate relay, the first branch is connected in parallel with the second branch, and the first branch is connected in series with the coil of the first intermediate relay to form a self-holding circuit, and the second branch is connected in series with the coil of the first intermediate relay to form a reset circuit; the fan fault signal expansion and alarm circuit also includes a fan fault sound and light alarm circuit connected in series by the normally open auxiliary contact of the first intermediate relay and the sound and light alarm light.

7. The fan operation monitoring system according to claim 6, characterized in that: The alarm module also includes a fan fault indication circuit, which is provided with a fan fault indication circuit consisting of an auxiliary normally open contact of the first AC contactor, an alarm signal output contact of the current relay and a fault indicator light connected in series; the fan fault indication circuit is also provided with a fan fault indication self-locking circuit consisting of a coil of an eleventh intermediate relay and a normally open auxiliary contact of the eleventh intermediate relay connected in series; wherein the coil of the eleventh intermediate relay is connected in parallel with the fault indicator light.

8. The fan operation monitoring system according to claim 7, characterized in that: The alarm module also includes a fan fault upload circuit, and a measurement and control device is provided on the fan fault upload circuit. The device power supply contacts of the measurement and control device are connected to the control power supply through a protection switch, and the normally open auxiliary contacts of the first intermediate relay are connected in series with the switch quantity collection contacts of the measurement and control device. The measurement and control device is used to upload the fault status of the fan to the background system.

9. A fan system, characterized in that: The invention comprises a fan and a fan operation monitoring system as claimed in any one of claims 1 to 8.

10. A method for monitoring fan operation, characterized in that: The following steps are involved: Real-time monitoring of the main circuit current of the fan; When the fan is in a state that meets the operating conditions and the main circuit current is less than or equal to the first set current threshold, it is determined that an abnormal signal occurs in the main circuit current; In response to an abnormal signal, the abnormal signal is continuously monitored within a preset time. If the main circuit current is still less than or equal to the first set current threshold within the preset time, it is confirmed that the fan is faulty; Output alarm signal.

11. The fan operation monitoring method according to claim 10, characterized in that: After the step of outputting the alarm signal, the method further comprises: When it is monitored that the main circuit current is greater than the second set current threshold, the alarm signal resets itself.

12. The fan operation monitoring method according to claim 10, characterized in that: The step of outputting an alarm signal comprises: The alarm signal is uploaded to a remote background system.

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