Fan fault detection device

Abstract

The utility model relates to the technical field of heat dissipation equipment fault detection, and particularly discloses a fan fault detection device which is simple and reliable in structure and easy to flexibly switch between a direct current system and an alternating current system. The fan fault detection device comprises a voltage relay connected with a fan in parallel and used for detecting the voltage of the fan, an air flow sensor used for detecting the air flow speed of the air outlet end of the fan, a detection power source electrically connected with the air flow sensor and used for supplying power to the air flow sensor, and a fault detection switch arranged on an output line of the voltage relay and the air flow sensor. The time relay is electrically connected with the fault detection switch and used for detecting the closing time of the fault detection switch, the first signal output terminal is electrically connected with the voltage relay, the air flow sensor and the time relay, and the second signal output terminal is electrically connected with the voltage relay, the air flow sensor and the time relay. And a detection probe of the air flow sensor is arranged in the air outlet direction of the fan.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat dissipation equipment fault detection technical field, especially a fan fault detection device. BACKGROUND

[0002] In power distribution, voltage transformation, energy storage and other power system equipment, a large number of air cooling devices (such as fans) are often arranged to dissipate heat from the equipment to control the temperature rise of the equipment, so that it works within a safe temperature range. The reliability of the fan operation directly determines the heat dissipation effect and reliable operation of the equipment. In order to ensure the reliable operation of the fan, while ensuring the quality of the fan itself, real-time, comprehensive and reliable detection of the fan is also needed to alarm in time when the fan fails and notify the operation and maintenance personnel to take immediate measures to prevent the equipment from running in the state of lacking fan heat dissipation protection, thereby improving the safety and reliability of the equipment operation.

[0003] Currently, the fan fault detection operation in the industry is mostly based on electrical parameters (such as current, voltage, frequency, etc.) in the fan operation or fault as a criterion to determine whether the fan is in a fault state. The circuit structure and logic of this scheme are complex, and there are requirements for the application working conditions of the fan. It is only suitable for direct current fans or alternating current fans. When it needs to be used for another type of fan, the multiple elements of the entire circuit need to be replaced and reconnected, and the circuit structure needs to be adjusted. It is difficult to convert the circuit between direct current fan detection and alternating current fan detection. UTILITY MODEL CONTENTS

[0004] Therefore, it is necessary to provide a fan fault detection device with simple and reliable structure, which can be easily switched between direct current and alternating current systems.

[0005] A fan fault detection device includes a voltage relay connected in parallel with a fan and used to detect the voltage of the fan, an air flow sensor used to detect the air flow rate at the air outlet end of the fan, a detection power supply electrically connected with the air flow sensor and used to supply power to the air flow sensor, a fault detection switch arranged on the output circuit of the voltage relay and the air flow sensor, a time relay electrically connected with the fault detection switch and used to detect the closing time of the fault detection switch, a first signal output terminal electrically connected with the voltage relay, the air flow sensor and the time relay, and a second signal output terminal electrically connected with the voltage relay, the air flow sensor and the time relay. The detection probe of the air flow sensor is arranged in the air outlet direction of the fan.

[0006] In one embodiment, the normally open contact of the voltage relay, the normally open contact of the air flow sensor, the contact of the time relay, the fault detection switch and the first signal output terminal are connected in series.

[0007] In one of the embodiments, the normally closed contact of the voltage relay, the contact of the time relay, the fault detection switch and the second signal output terminal are connected in series, and the normally closed contact of the air flow sensor is connected in parallel with the normally closed contact of the voltage relay.

[0008] In one of the embodiments, the fault detection switch comprises an automatic switch and a manual switch arranged in parallel.

[0009] In one of the embodiments, the fan fault detection device further comprises a signal output module connected with the first signal output terminal and the second signal output terminal; the signal output module is an audible and light alarm or a display device connected with the first signal output terminal and the second signal output terminal.

[0010] In one of the embodiments, the fan fault detection device further comprises a communication module electrically connected with the first signal output terminal and the second signal output terminal, and the signal output module is in communication connection with the communication module.

[0011] In one of the embodiments, the voltage relay, the air flow sensor, the detection power supply, the fault detection switch, the time relay, the first signal output terminal and the second signal output terminal are accommodated in the shell of the fan, and the detection probe of the air flow sensor is located at the air outlet end of the fan, and the surface of the shell of the fan is provided with a first interface corresponding to the first signal output terminal and a second interface corresponding to the second signal output terminal.

[0012] In one of the embodiments, the fan fault detection device further comprises a housing arranged in the air outlet direction of the fan, and the voltage relay, the air flow sensor, the detection power supply, the fault detection switch, the time relay, the first signal output terminal and the second signal output terminal are accommodated in the housing, and the surface of the housing is provided with a third interface corresponding to the first signal output terminal and a fourth interface corresponding to the second signal output terminal.

[0013] In one of the embodiments, the voltage relay is a direct current voltage relay.

[0014] In one of the embodiments, the voltage relay is an alternating current voltage relay.

[0015] The fan fault detection device of the utility model only needs to be provided with a voltage relay, a time relay, an air flow sensor, a detection power supply and a fault detection switch, and the working condition signal of the fan can be output through the first signal output terminal and the second signal output terminal, and the structure is simple and reliable; when the power supply type of the fan to be detected changes, only the type of the voltage relay needs to be replaced, the overall wiring condition of the circuit does not change, the number of components to be replaced is small, it is easy to flexibly switch in the direct current and alternating current systems, and the difficulty of conversion of the circuit of the device between the direct current fan detection and the alternating current fan detection is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The module connection diagram of the fan fault detection device in an embodiment of the utility model;

[0017] Figure 2 The circuit principle diagram that the air flow sensor is connected with time relay in an embodiment of the utility model;

[0018] Figure 3 The circuit principle diagram that the fan is connected with voltage relay in an embodiment of the utility model;

[0019] Figure 4 The principle diagram of signal transmission under the condition of no fault of the fan in an embodiment of the utility model;

[0020] Figure 5 The principle diagram of signal transmission under the condition of fan fault in an embodiment of the utility model;

[0021] Figure 6 The logic judgment diagram of the fan fault detection device in an embodiment of the utility model when working. DETAILED DESCRIPTION

[0022] In order to make the above objects, features and advantages of the utility model more apparent, the specific embodiments of the utility model are described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. But the utility model can be implemented in many other ways different from the description, and the person skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0023] Please combine Figures 1-3 The utility model discloses a simple structure reliable, easily flexible switching in direct current and alternating current system's fan fault detection device, this fan fault detection device includes with fan (that is Figure 3The voltage relay 100 for detecting the fan voltage, the air flow sensor 200 for detecting the air flow rate at the air outlet end of the fan, the detection power supply 300 electrically connected with the air flow sensor 200 and supplying power to the air flow sensor 200, the fault detection switch 400 arranged on the output circuit of the voltage relay 100 and the air flow sensor 200, the time relay 500 electrically connected with the fault detection switch 400 and used for detecting the closing time of the fault detection switch 400, the first signal output terminal 600 electrically connected with the voltage relay 100, the air flow sensor 200 and the time relay 500, the second signal output terminal 700 electrically connected with the voltage relay 100, the air flow sensor 200 and the time relay 500, and the detection probe of the air flow sensor 200 is arranged in the air outlet direction of the fan. It can be understood that, in the embodiment, the voltage relay 100 is connected to the working circuit of the fan and is powered by the fan power supply, and the voltage relay 100 can still output an electrical signal when the fan is powered off; the air flow sensor 200 is powered by the independent detection power supply 300, and the detection power supply 300 is also used to supply power to the time relay 500 to ensure the normal operation of the air flow sensor 200 and the time relay 500 during the detection process.

[0024] The fan voltage is detected by the voltage relay 100, which outputs a closed signal when the fan voltage reaches a preset value, and outputs an open signal when the fan voltage is lower than the preset value. The air flow sensor 200 is used to detect whether the corresponding air flow is generated when the fan is working, so as to determine whether the fan is working normally. When the detection probe of the fan sensor detects that the air flow rate in the fan outflow direction is higher than a preset value (so as to exclude the interference caused by the external air flow in the fan outflow direction), the fan sensor outputs a closed signal; when the detection probe of the fan sensor detects that the air flow rate in the fan outflow direction is lower than the preset value, the fan sensor outputs an open signal. The time relay 500 is used to detect the closing time of the fault detection switch 400, and responds when the closing time of the fault detection switch 400 reaches a preset value, that is, the time relay 500 in the embodiment is a delay switch, so as to exclude the misjudgment caused by the voltage relay 100 detecting a transient or short-term larger voltage value, or the air flow sensor 200 detecting a transient or short-term larger air flow rate value, thereby improving the reliability of the fan fault detection. In addition, the first signal output terminal 600 receives the signals sent by the voltage relay 100 and the air flow sensor 200 and outputs a fan no-fault signal, and the second signal output terminal 700 receives the signals sent by the voltage relay 100 and the air flow sensor 200 and outputs a fan fault signal. That is, in the embodiment, when the first signal output terminal 600 outputs a closed signal (high level) when the fan fault detection device is working, the second signal output terminal 700 outputs an open signal (low level), and the fan fault detection device outputs a fan no-fault signal; when the first signal output terminal 600 outputs an open signal (low level), the second signal output terminal 700 outputs a closed signal (high level), and the fan fault detection device outputs a fan fault signal.

[0025] Please combine Figures 1-5In this embodiment, the voltage relay 100 has a normally open contact KU1-2 and a normally closed contact KU3-4, and the airflow sensor 200 has a normally open contact FL1-2 and a normally closed contact FL3-4. When the voltage relay 100 outputs a closing signal (high level), its normally open contact KU1-2 closes and its normally closed contact KU3-4 opens. When the airflow sensor 200 detects a preset wind speed, its normally open contact FL1-2 closes and its normally closed contact FL3-4 opens. Specifically, in this embodiment, the normally open contact KU1-2 of the voltage relay 100, the normally open contact FL1-2 of the airflow sensor 200, the contact of the time relay 500, the fault detection switch 400, and the first signal output terminal 600 are connected in series. The normally closed contact KU3-4 of the voltage relay 100, the contact of the time relay 500, the fault detection switch 400, and the second signal output terminal 700 are connected in series. The normally closed contact FL3-4 of the airflow sensor 200 is connected in parallel with the normally closed contact KU3-4 of the voltage relay 100. Further, in this embodiment, it can be understood that after the normally open contact KU1-2 of the voltage relay 100 and the normally open contact FL1-2 of the airflow sensor 200 are connected in series to form a series circuit, this series circuit is connected in parallel with the normally closed contact FL3-4 of the airflow sensor 200 and the normally closed contact KU3-4 of the voltage relay 100.

[0026] Specifically, when the fan is not faulty, the fault detection switch 400 (i.e. Figure 4 After the SK switch is closed, the fan fault detection device is powered on. The voltage relay 100 detects that the fan voltage has reached the rated voltage, and its normally open contact KU1-2 closes while its normally closed contact KU3-4 opens. The airflow sensor 200 monitors the fan speed in real time. When the fan reaches its rated speed, the airflow speed reaches the preset speed, and the normally open contact FL1-2 of the airflow sensor 200 closes while its normally closed contact FL3-4 opens. When the fault detection switch 400 is closed for a preset time, the contact KT1-2 of the time relay 500 closes (actually, the contact of the time relay 500 closes with a delay relative to the contacts of the voltage relay 100 and the fan sensor), and the first signal output terminal 600 (i.e. Figure 4 The output nodes OUT1-2 in the middle output a fault-free closed dry node signal.

[0027] When a fan malfunctions, if the fan power supply voltage is outside the normal range, the voltage value detected by voltage relay 100 fails to reach the preset voltage value, and voltage relay 100 does not activate. The normally open contact KU1-2 of voltage relay 100 opens, and the normally closed contact KU3-4 closes. When fault detection switch 400 is closed for a preset time, contact KT1-2 of time relay 500 closes, and the second signal output terminal 700 (i.e. Figure 5The output node OTU3-4 in the system outputs a faulty closed dry contact signal. When a fault occurs inside the fan or the fan stalls, the final result is that the fan cannot reach the rated speed, and the normally open switch FL1-2 of the flow relay cannot be triggered to close. At this time, the normally closed contact FL3-4 of the flow sensor 200 closes. When the fault detection switch 400 is closed for a preset time, the contact KT1-2 of the time relay 500 closes, and the second signal output terminal 700 (i.e., Figure 5 The output node OTU3-4 in the middle outputs a faulty closed dry contact signal. At this time, regardless of whether the fan voltage is normal, the second signal output terminal 700 will output a faulty closed dry contact signal.

[0028] In other words, in this solution, whether the fan voltage is insufficient or the fan speed (gas flow rate) is insufficient, the second signal output terminal 700 will output an alarm signal. Thus, by using the time relay 500, voltage relay 100, and airflow sensor 200 in conjunction, fan malfunctions caused by external factors and internal fan faults can be detected without relying on traditional complex circuits, such as logic judgments based on voltage, current, phase, and frequency. This makes the device simple, reliable, easy to implement, and of great practical significance. In other embodiments, further... Figure 5 Based on the circuit diagram shown, a first detection module connected to the normally closed contact KU3-4 of the voltage relay 100 and a second detection module connected to the normally closed contact FL3-4 of the airflow sensor 200 are set up. For example, the first detection module is set as a voltage detector connected in parallel with the normally closed contact KU3-4, and the second detection module is set as another voltage detector connected in parallel with the normally closed contact FL3-4 of the airflow sensor 200. In this way, by collecting the voltage values ​​of the two voltage detectors, the fault of the fan can be determined.

[0029] In one embodiment, the fault detection switch 400 includes an automatic switch and a manual switch connected in parallel. The automatic switch can be a temperature control switch or a relay electrically connected to the controller of the device to be cooled. Thus, when the temperature inside the device rises, the automatic switch closes and activates the fan fault detection device to detect fan faults; or, when the device starts up, the automatic switch closes to activate the fan fault detection device. Alternatively, the fan fault detection device can be activated by manually operating the manual switch.

[0030] In another embodiment, the voltage relay 100 is a DC voltage relay 100. In another embodiment, the voltage relay 100 is an AC voltage relay 100. Specifically, when the fan to be tested is a DC fan, the voltage relay 100 is a DC voltage relay 100; when the fan to be tested is an AC fan, the voltage relay 100 can be replaced with an AC voltage relay 100.

[0031] In one embodiment, the fan fault detection device further includes a signal output module connected to the first signal output terminal 600 and the second signal output terminal 700; the signal output module is an audible and visual alarm or a display device connected to the first signal output terminal 600 and the second signal output terminal 700. Specifically, the audible and visual alarm or display device is electrically connected to the first signal output terminal 600 and the second signal output terminal 700. In another embodiment, the fan fault detection device further includes a communication module electrically connected to the first signal output terminal 600 and the second signal output terminal 700. The signal output module is communicatively connected to the communication module, which communicates with the signal output module via Bluetooth, Zigbee protocol, or Wi-Fi. Thus, when the signal output module receives a signal from the first signal output terminal 600 or the second signal output terminal 700, it can issue an audible and visual alarm or display the relevant fault information on the display device according to the fan fault condition to alert the user or operator.

[0032] The fan fault detection device of this embodiment can be designed as a built-in fan structure or an external fan structure. In one embodiment, the voltage relay 100, airflow sensor 200, detection power supply 300, fault detection switch 400, time relay 500, first signal output terminal 600, and second signal output terminal 700 are housed within the fan housing, and the detection probe of the airflow sensor 200 is located at the fan's air outlet end. The surface of the fan housing is provided with a first interface corresponding to the first signal output terminal 600 and a second interface corresponding to the second signal output terminal 700. That is, the entire fan fault detection device is built into the fan housing. In another embodiment, the fan fault detection device further includes a housing disposed in the fan's air outlet direction. The voltage relay 100, airflow sensor 200, detection power supply 300, fault detection switch 400, time relay 500, first signal output terminal 600, and second signal output terminal 700 are housed within the housing, and the surface of the housing is provided with a third interface corresponding to the first signal output terminal 600 and a fourth interface corresponding to the second signal output terminal 700. In other words, the fan fault detection device is placed externally on the fan to facilitate its maintenance.

[0033] Please combine Figures 1-6 During the operation of the fan fault detection device, the first step is to ensure that the fan's power supply switch is closed and then power on the fan fault detection device to start the detection. Manual or automatic detection modes can be selected (achieved by controlling the manual and automatic switches).

[0034] The voltage relay 100 determines whether the power supply circuit voltage of the fan is within the normal range. If it is outside the normal range, the fan is considered faulty, and the second signal output terminal 700 outputs an alarm signal. This signal can be used to upload fault status or connect to an audible and visual alarm device. If the voltage detected by the voltage relay 100 is normal, theoretically, the fan will reach its rated speed and run continuously within a short time. At this time, airflow will blow across the airflow sensor 200, causing the airflow sensor 200 to output a corresponding closed contact signal, thus determining the fan's operating status. If the fan voltage is detected to be normal, and after a delay setting (i.e., the time relay 500 closes after a delay), the fan operates in its rated operating state, the airflow sensor 200 activates, and the fan is considered fault-free. The first signal output terminal 600 outputs a normal status signal. If the fan voltage is detected to be normal, and after a delay setting (i.e., the time relay 500 closes after a delay), the fan should reach the rated output. If the airflow sensor 200 does not activate, it is determined that the fan has not reached the rated speed or has not started, and the fan is considered to be faulty. The second signal output terminal 700 outputs a fault status signal, which can be used to upload the fault status or connect to an audible and visual alarm.

[0035] It should be noted that if the airflow sensor 200 fails to detect airflow caused by the fan under rated voltage, the fan may be faulty. The fault may manifest in different ways, such as: when there is an internal disconnection, the fan does not run at all; or when the fan is stalled, it cannot trigger the airflow sensor 200 because it has not reached the rated speed.

[0036] The fan fault detection device of this utility model only requires a voltage relay 100, a time relay 500, a flow sensor 200, a detection power supply 300, and a fault detection switch 400. It can output the fan's operating condition signal through the first signal output terminal 600 and the second signal output terminal 700. Its structure is simple and reliable. When the power supply type of the fan under test changes, only the type of voltage relay 100 needs to be changed. The overall wiring of the circuit remains unchanged. The number of components that need to be replaced is small, and it is easy to switch flexibly between DC and AC systems, reducing the difficulty of switching the device's circuit between DC fan detection and AC fan detection.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A fan failure detection apparatus, characterized by, The fan further comprises a voltage relay connected in parallel with the fan and used for detecting a voltage of the fan, an air flow sensor used for detecting a gas flow rate at an air outlet end of the fan, a detection power supply connected electrically with the air flow sensor and used for supplying power to the air flow sensor, a fault detection switch arranged on an output circuit of the voltage relay and the air flow sensor, a time relay connected electrically with the fault detection switch and used for detecting a closing time of the fault detection switch, a first signal output terminal connected electrically with the voltage relay, the air flow sensor and the time relay, and a second signal output terminal connected electrically with the voltage relay, the air flow sensor and the time relay, and a detection probe of the air flow sensor is arranged in a direction of air outlet of the fan.

2. The fan fault detection apparatus of claim 1, wherein The normally open contact of the voltage relay, the normally open contact of the air flow sensor, the contact of the time relay, the fault detection switch and the first signal output terminal are connected in series.

3. The fan fault detection apparatus of claim 1, wherein The normally closed contact of the voltage relay, the contact of the time relay, the fault detection switch and the second signal output terminal are connected in series, and the normally closed contact of the air flow sensor is connected in parallel with the normally closed contact of the voltage relay.

4. The fan fault detection apparatus of claim 1, wherein The fault detection switch comprises an automatic switch and a manual switch arranged in parallel.

5. The fan fault detection apparatus of claim 1, wherein The fan further comprises a signal output module connected with the first signal output terminal and the second signal output terminal, and the signal output module is an audible and light alarm or a display device connected with the first signal output terminal and the second signal output terminal.

6. The fan fault detection apparatus of claim 5, wherein, The fan further comprises a communication module connected electrically with the first signal output terminal and the second signal output terminal, and the signal output module is connected in communication with the communication module.

7. The fan fault detection apparatus of claim 1, wherein The voltage relay, the air flow sensor, the detection power supply, the fault detection switch, the time relay, the first signal output terminal and the second signal output terminal are accommodated in a shell of the fan, and the detection probe of the air flow sensor is located at the air outlet end of the fan, and the shell of the fan is provided with a first interface corresponding to the first signal output terminal and a second interface corresponding to the second signal output terminal.

8. The fan fault detection apparatus of claim 1, wherein, The fan further comprises a housing arranged in a direction of air outlet of the fan, and the voltage relay, the air flow sensor, the detection power supply, the fault detection switch, the time relay, the first signal output terminal and the second signal output terminal are accommodated in the housing, and the housing is provided with a third interface corresponding to the first signal output terminal and a fourth interface corresponding to the second signal output terminal.

9. The fan fault detection apparatus of claim 1, wherein The voltage relay is a direct current voltage relay.

10. The fan fault detection apparatus of claim 1, wherein The voltage relay is an alternating current voltage relay.

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