Direct-current fan locked-rotor detection device

Abstract

A direct current fan stalling detection device comprises an airflow detection mechanism, a signal detection mechanism and a control unit. The airflow detection mechanism comprises a connecting belt, the connecting belt is fixedly connected with a plurality of connecting pieces, the connecting pieces are fixedly connected with airflow sensors, the connecting pieces can be fixed to a center column of the direct-current fan in a one-to-one correspondence mode, and the airflow sensors extend to the position in front of an air outlet of the direct-current fan. The signal detection mechanism comprises a plurality of signal acquisition units, each signal acquisition unit comprises an acquisition resistor and an acquisition diode, one end of each acquisition resistor is electrically connected with a power supply of the direct-current fan, and the other end of each acquisition resistor is electrically connected with a rotation detection signal output end of the direct-current fan and an anode of the corresponding acquisition diode; the control unit is electrically connected with all the airflow sensors and the negative electrodes of all the collection diodes. The airflow detection mechanism and the signal detection mechanism are used for detecting the direct-current fan respectively, and the two detection mechanisms complement each other, so that whether the direct-current fan is blocked or not can be fully detected.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology for charging piles, specifically a DC fan stall detection device. Background Technology

[0002] In existing charging piles, multiple DC fans are generally used for heat dissipation to ensure the stable operation of high-power AC / DC charging modules. If one of the DC fans stalls but the fault is not detected, the charging module will experience local overheating during continuous operation, resulting in reduced lifespan and insufficient reliability of the charging module.

[0003] To monitor the real-time operating status of DC fans and determine if a stall fault has occurred, most existing technologies rely on reading signals from the fan's built-in sensors. However, this method has a single signal source and depends on the status of the built-in sensors. If the built-in sensors malfunction, stall faults may go undetected, leading to overheating of the charging module. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a DC fan stall detection device. It employs an airflow detection mechanism and a signal detection mechanism to detect the DC fan separately. The two detection mechanisms complement each other, which can fully detect whether the DC fan has stalled, ensuring timely handling after the DC fan stalls.

[0005] To achieve the above objectives, the specific solution adopted by this utility model is as follows: a DC fan stall detection device, comprising an airflow detection mechanism, a signal detection mechanism, and a control unit;

[0006] The airflow detection mechanism includes a connecting belt, with multiple connecting pieces fixedly connected to the connecting belt, and airflow sensors fixedly connected to the connecting pieces. The connecting pieces can be fixed one-to-one on the central column of the DC fan, and the airflow sensors extend to the front of the DC fan's air outlet.

[0007] The signal detection mechanism includes multiple signal acquisition units. Each signal acquisition unit includes an acquisition resistor and an acquisition diode. One end of the acquisition resistor is electrically connected to the power supply of the DC fan, and the other end of the acquisition resistor is electrically connected to both the rotation detection signal output terminal of the DC fan and the positive terminal of the acquisition diode.

[0008] The control unit is electrically connected to the negative terminal of all the airflow sensors and all the acquisition diodes.

[0009] As a further optimization of the aforementioned DC fan stall detection device: the connecting strip is provided with multiple transition sections, and every two transition sections form a group. The two transition sections in the same group are located on both sides of a connecting piece, and the thickness of the transition section is less than the thickness of the rest of the connecting strip.

[0010] As a further optimization of the aforementioned DC fan stall detection device: two notches are provided on the transition section, and the two notches face opposite directions.

[0011] As a further optimization of the aforementioned DC fan stall detection device: the connecting piece is cylindrical, one end of the connecting piece is fixedly connected to the connecting strip, and the other end of the connecting piece is fixedly connected to the central column through an adhesive piece.

[0012] As a further optimization of the aforementioned DC fan stall detection device: an axially extending outlet is provided on one end of the connecting piece that is fixedly connected to the connecting strip, and the outlet is connected to an inlet that extends radially along the connecting piece. The inlet is also connected to a mounting hole for installing the airflow sensor, and the signal line of the airflow sensor can pass through the inlet and outlet in sequence.

[0013] As a further optimization of the aforementioned DC fan stall detection device: the connecting strip has a wire-passing channel extending along its length, and a transmission line is provided in the wire-passing channel. The wire-passing channel is connected to multiple connecting channels that correspond one-to-one with the connecting piece. The connecting channels are connected to the outlet so that the signal line can pass through the connecting channel and connect to the transmission line. The transmission line is electrically connected to the control unit.

[0014] As a further optimization of the aforementioned DC fan stall detection device: the signal detection mechanism includes a filter capacitor Ca, and the negative terminals of all the acquisition diodes are electrically connected to the control unit through the filter capacitor Ca.

[0015] As a further optimization of the aforementioned DC fan stall detection device: the signal detection mechanism includes a voltage divider resistor Ra, a voltage divider resistor Rb, and a voltage divider resistor Rc. The first ends of the voltage divider resistor Ra and the first ends of the voltage divider resistor Rb are connected to the two ends of the filter capacitor Ca. The second ends of the voltage divider resistor Ra, the second ends of the voltage divider resistor Rb, and the first end of the voltage divider resistor Rc are connected together. The second end of the voltage divider resistor Rc is electrically connected to the control unit.

[0016] Beneficial effects: This utility model uses an airflow detection mechanism and a signal detection mechanism to detect the DC fan respectively. The two detection mechanisms complement each other and can fully detect whether the DC fan is stalled, ensuring that it can be dealt with in a timely manner after the DC fan stalls. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cooperation between the airflow detection mechanism and the DC fan in this utility model;

[0018] Figure 2 This is a schematic diagram of the airflow detection mechanism;

[0019] Figure 3 This is a schematic diagram illustrating the setup of the transition section;

[0020] Figure 4 This is a structural schematic diagram of the connecting piece;

[0021] Figure 5 This is a schematic diagram of a signal detection mechanism.

[0022] Figure description: 1-DC fan, 2-center column, 3-connecting piece, 4-airflow sensor, 5-connecting strip, 6-transition part, 7-notch, 8-adhesive piece, 9-mounting hole, 10-inlet, 11-outlet, 12-connection channel, 13-wiring channel. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 5 As shown, a DC fan stall detection device includes an airflow detection mechanism, a signal detection mechanism, and a control unit.

[0025] The airflow detection mechanism includes a connecting belt 5, which is fixedly connected to multiple connecting pieces 3. Each connecting piece 3 is fixedly connected to an airflow sensor 4. The connecting pieces 3 can be fixed one-to-one on the central column 2 of the DC fan 1, and the airflow sensor 4 extends to the front of the air outlet of the DC fan 1.

[0026] The signal detection mechanism includes multiple signal acquisition units, each of which includes an acquisition resistor and an acquisition diode. One end of the acquisition resistor is electrically connected to the power supply of the DC fan, and the other end of the acquisition resistor is electrically connected to both the rotation detection signal output terminal of the DC fan and the positive terminal of the acquisition diode.

[0027] The control unit is electrically connected to the negative terminal of all airflow sensors 4 and all acquisition diodes.

[0028] This invention is applicable to the detection of multiple DC fans 1 in a charging pile. In use, firstly, select a suitable length of connecting strap 5 and a corresponding number of connecting pieces 3 according to the number of DC fans 1 used in the charging pile. Then, fix the connecting pieces 3 one-to-one on the central column 2 of the DC fan 1, and adjust the direction of the airflow sensor 4 so that it extends in front of the air outlet of the DC fan 1, enabling the airflow sensor 4 to detect the airflow of the DC fan 1. Subsequently, during the operation of the DC fan 1, the operating status of the DC fan 1 is detected by the airflow detection mechanism and the signal detection mechanism respectively. Specifically, the airflow detection mechanism uses the airflow sensor 4 to detect the airflow generated by the DC fan 1. If the DC fan 1 is in operation but no airflow is detected, it indicates that the DC fan 1 may be stalled. The signal detection mechanism uses a signal acquisition unit to collect a rotation detection signal, i.e., an RD signal, from the DC fan 1. If the rotation detection signal reflects an abnormal rotor position, it indicates that the DC fan 1 may be stalled. After receiving the signals from the airflow sensor 4 and the rotation detection signal, the control unit can determine whether the DC fan 1 is stalled. The airflow detection mechanism and the signal detection mechanism complement each other to ensure that the DC fan 1 can be detected as stalled, thus ensuring timely handling after the DC fan 1 stalls. It should also be noted that the airflow sensor 4 is a mature existing technology, and its structure and principle will not be described in detail here.

[0029] This utility model employs an airflow detection mechanism and a signal detection mechanism to detect the DC fan 1. The two detection mechanisms complement each other, which can fully detect whether the DC fan 1 is stalled, and ensure that the DC fan 1 can be dealt with in a timely manner after it stalls.

[0030] In different charging piles, the distribution of multiple DC fans 1 may vary. To make the connecting strip 5 adaptable to different charging piles and avoid manufacturing a dedicated connecting strip 5 for each charging pile, thereby reducing costs, the connecting strip 5 is provided with multiple transition sections 6. Each pair of transition sections 6 forms a group, with the two transition sections 6 in each group located on opposite sides of a connecting piece 3. The thickness of the transition section 6 is less than the thickness of the rest of the connecting strip 5. By providing transition sections 6 on both sides of the connecting piece 3 and making the thickness of the transition sections 6 smaller, the connecting strip 5 can bend on both sides of the connecting piece 3, thereby changing the direction of the connecting strip 5 and making it more flexible to adapt to the distribution of the DC fans 1.

[0031] To make the connecting strip 5 easier to bend, two notches 7 are provided on the transition section 6, and the two notches 7 face opposite directions.

[0032] The specific connection method between the connecting piece 3 and the center column 2 of the DC fan 1 is as follows: the connecting piece 3 is cylindrical, one end of the connecting piece 3 is fixedly connected to the connecting strip 5, and the other end of the connecting piece 3 is fixedly connected to the center column 2 through the adhesive piece 8. The adhesive piece 8 can be conventional double-sided tape or foam tape, or other conventional technologies, which will not be elaborated here.

[0033] To facilitate the transmission of signals from the airflow sensor 4 to the control unit, an axially extending outlet 11 is provided on the end of the connecting piece 3 that is fixedly connected to the connecting strip 5. The outlet 11 is connected to an inlet 10 that extends radially along the connecting piece 3. The inlet 10 is also connected to a mounting hole 9 for mounting the airflow sensor 4. The signal wire of the airflow sensor 4 can pass through the inlet 10 and the outlet 11 in sequence. A wire-passing channel 13 extending along the length direction is provided inside the connecting strip 5. A transmission line is installed in the wire-passing channel 13. The wire-passing channel 13 is connected to multiple connecting channels 12 corresponding to the connecting piece 3. The connecting channels 12 are connected to the outlet 11, allowing the signal wire to pass through the connecting channel 12 and connect to the transmission line. The transmission line is electrically connected to the control unit. Based on the signal line and the transmission line, the airflow sensor 4 can upload signals to the control unit via wired communication, making the transmission process more stable.

[0034] The specific structure of the signal detection mechanism is as follows: The signal detection mechanism includes a filter capacitor Ca, and the negative terminals of all acquisition diodes are electrically connected to the control unit through the filter capacitor Ca; the signal detection mechanism includes voltage divider resistors Ra, Rb, and Rc, the first ends of voltage divider resistors Ra and Rb are connected to the two ends of the filter capacitor Ca respectively, the second ends of voltage divider resistors Ra, Rb, and Rc are connected together, and the second end of voltage divider resistor Rc is electrically connected to the control unit.

[0035] More specifically, such as Figure 2 As shown, in Figure 2In this circuit, FAN1, FAN2, ..., FANn represent multiple DC fans 1. The first power supply terminal VCC of the main power supply is directly connected to the power supply of FAN1, FAN2...FANn, supplying power to the DC fans 1. The first power supply terminal VCC is then connected to one end of the first resistor R1, the second resistor R2...the nth resistor Rn. The other ends of the first resistor R1, the second resistor R2...the nth resistor Rn are respectively connected to the anodes of RD1, RD2...RDn of the DC fans FAN1, FAN2...FANn and the anodes of the first diode D1, the second diode D2...the nth diode Dn. The cathodes of the first diode D1, the second diode D2...the nth diode Dn are connected together and then connected to one end of the filter capacitor Ca. The other end of Ca is connected to GND. Through the voltage divider resistors Ra, Rb, and Rc, the voltage of the control unit's I / O interface is maintained within a controllable range to identify high and low levels. After the control unit identifies the high and low levels, it controls whether the charging module and other devices output normally.

[0036] When DC fan 1 is working normally, the internal transistor is in the conducting state, and the RD signal is low. When FAN2 is working normally and FAN1 experiences a stall fault, the internal transistor of DC fan FAN1 is in the cut-off state. RD1 is pulled high through the acquisition resistor R1. VCC, through diode D1, and then through voltage divider resistors Ra, Rb, and Rc, provides a high level of ≥2.0VDC and ≤5.0VDC to the control unit's I / O interface. The control unit stops the output of the equipment protected by DC fan 1, reports the fan stall fault, and prevents local overheating of the equipment.

[0037] In this invention, the control unit can be a conventional microcontroller, such as the STM32 series microcontroller, which is existing technology and will not be described in detail here.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC fan stall detection device, characterized in that, Includes an airflow detection mechanism, a signal detection mechanism, and a control unit; The airflow detection mechanism includes a connecting belt (5), which is fixedly connected to multiple connecting pieces (3). The connecting pieces (3) are fixedly connected to airflow sensors (4). The connecting pieces (3) can be fixed one-to-one on the central column (2) of the DC fan (1), and the airflow sensors (4) extend to the front of the air outlet of the DC fan (1). The signal detection mechanism includes multiple signal acquisition units. Each signal acquisition unit includes an acquisition resistor and an acquisition diode. One end of the acquisition resistor is electrically connected to the power supply of the DC fan, and the other end of the acquisition resistor is electrically connected to both the rotation detection signal output terminal of the DC fan and the positive terminal of the acquisition diode. The control unit is electrically connected to the negative terminals of all the airflow sensors (4) and all the acquisition diodes.

2. The DC fan stall detection device as described in claim 1, characterized in that, The connecting strip (5) is provided with a plurality of transition portions (6), and every two transition portions (6) form a group. The two transition portions (6) in the same group are located on both sides of a connecting piece (3). The thickness of the transition portion (6) is less than the thickness of the rest of the connecting strip (5).

3. The DC fan stall detection device as described in claim 2, characterized in that, The transition section (6) has two notches (7) and the two notches (7) face opposite directions.

4. The DC fan stall detection device as described in claim 1, characterized in that, The connecting piece (3) is cylindrical. One end of the connecting piece (3) is fixedly connected to the connecting strip (5), and the other end of the connecting piece (3) is fixedly connected to the central column (2) through the adhesive piece (8).

5. The DC fan stall detection device as described in claim 4, characterized in that, The connecting piece (3) is provided with an axially extending outlet (11) at one end that is fixedly connected to the connecting strip (5). The outlet (11) is connected to an inlet (10) that extends radially along the connecting piece (3). The inlet (10) is also connected to a mounting hole (9) for mounting the airflow sensor (4). The signal line of the airflow sensor (4) can pass through the inlet (10) and the outlet (11) in sequence.

6. The DC fan stall detection device as described in claim 5, characterized in that, The connecting strip (5) has a wire channel (13) extending along its length inside. A transmission line is provided in the wire channel (13). The wire channel (13) is connected to a plurality of connecting channels (12) that correspond one-to-one with the connecting piece (3). The connecting channel (12) is connected to the outlet (11) so that the signal line can pass through the connecting channel (12) and connect to the transmission line. The transmission line is electrically connected to the control unit.

7. The DC fan stall detection device as described in claim 1, characterized in that, The signal detection mechanism includes a filter capacitor Ca, and the negative terminals of all the acquisition diodes are electrically connected to the control unit through the filter capacitor Ca.

8. The DC fan stall detection device as described in claim 7, characterized in that, The signal detection mechanism includes voltage divider resistors Ra, Rb, and Rc. The first ends of voltage divider resistors Ra and Rb are connected to the two ends of the filter capacitor Ca. The second ends of voltage divider resistors Ra, Rb, and Rc are connected together. The second end of voltage divider resistor Rc is electrically connected to the control unit.

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