Silent fan for vehicle-mounted dust sensor

Abstract

The silent fan for the vehicle-mounted dust sensor comprises a fan frame, a copper middle pipe is arranged in the fan frame, a motor is arranged on the outer side of the copper middle pipe in a sleeved mode, the motor comprises a plurality of magnetic stators, the magnetic stators are connected to a PCBA board, a bearing is fixed to the inner side of the copper middle pipe, a rotor is rotationally connected into the bearing, and the rotor is connected to the outer side of the copper middle pipe in a sleeved mode. The rotor is provided with fan blades, and the PCBA board is provided with a control circuit for regulating and controlling the magnetic intensity of the magnetic stator; according to the utility model, the product quality is optimized from internal electronics, and the rest feeling of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a silent fan for a vehicle-mounted dust sensor. Background Art

[0002] In the vehicle or home environment, there are problems such as air environmental pollution and excessive dust. The dust sensor can detect the dust content in the air in real time. As a core component of the dust sensor, the fan is used to generate a constant airflow to provide the purpose of detecting the dust in the air by the dust sensor. Since only the single function of generating airflow was considered in the initial design, the existing fans on the market have poor silent effects, relatively large fan noise, unstable sound quality, which affect the user experience. In addition, the product did not consider its service life at the beginning of the design, and generally has a short service life. The fan inside the dust sensor needs to be replaced frequently, which greatly affects the user experience. During the popularization and promotion of dust sensors, there is an urgent need for a fan that can improve the user experience to conform to the market trend. Summary of the Utility Model

[0003] The utility model solves the problems of unstable noise and sound quality and short service life of the existing fans for dust sensors, and provides a silent fan for a vehicle-mounted dust sensor, which optimizes the product quality from the internal electronics and improves the user experience.

[0004] To achieve the above object, the following technical solutions are proposed:

[0005] A silent fan for a vehicle-mounted dust sensor, comprising a fan frame, a copper middle tube is arranged inside the fan frame, a motor is sleeved outside the copper middle tube, the motor comprises a plurality of magnetic stators, the magnetic stators are connected to a PCBA board, a bearing is fixed inside the copper middle tube, a rotor is rotatably connected inside the bearing, a fan blade is arranged on the rotor, and the PCBA board is provided with a control circuit for regulating the magnetic strength of the magnetic stators.

[0006] The utility model comprises a rotor, a bearing, a motor and a fan frame. A copper middle tube and a shell made of PBT material are arranged inside the fan frame. The motor is sleeved outside the copper middle tube. The motor comprises a PCBA board and a plurality of magnetic stators. The magnetic stators are electrically connected to the PCBA board. The bearing is fixed inside the copper middle tube. The rotor is rotatably connected inside the bearing. A fan blade is arranged on the rotor and distributed inside the shell. The end face of the rotor is basically flush with the end face of the shell. The PCBA board is provided with a control circuit, and the control circuit regulates the magnetic strength of the magnetic stators to control the rotation speed of the fan blade.

[0007] Preferably, the magnetic stator includes silicon steel sheets and enameled wires wound around the silicon steel sheets. The control circuit is provided with a control module, which has a PWM input terminal. The output terminal of the control module is connected to the enameled wires, and the control module controls the output of the output terminal according to the PWM signal received by the PWM input terminal.

[0008] The magnetic stator of the present utility model includes enameled wires and silicon steel sheets, and the enameled wires are wound around the silicon steel sheets. The control circuit is provided with a control module, which is a KP90832X control chip. The control module has an output terminal and a PWM input terminal. The enameled wires are connected to the output terminal of the control module, and the control module controls the output of the output terminal according to the PWM signal received by the PWM input terminal. The present utility model uses PWM signal control, the PWM curve is flexibly adjustable, the slope of the PWM curve is adjustable / the lowest rotation / stop rotation can be set, and at the same time, the rotational speed control accuracy is high, with a high rotational speed of + / - 5% accuracy.

[0009] Preferably, the control circuit is provided with a one-way conduction diode D1. The input terminal of the one-way conduction diode D1 is connected to an external power supply, and the output terminal of the one-way conduction diode D1 is connected in parallel to one end of a resistor R1 and the voltage input terminal of the control module. The other end of the resistor R1 is grounded through a capacitor C1.

[0010] The control circuit of the present utility model is provided with a one-way conduction diode D1 on the input side of the control module. The external power supply is connected to the input terminal of the one-way conduction diode D1. The output terminal of the one-way conduction diode D1 is connected in parallel to the voltage input terminal of the control module and one end of a resistor R1. The other end of the resistor R1 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is grounded. The purpose of such a setting in the present utility model is to have built-in noise suppression, soft start to suppress peak current, no need for a voltage stabilizing diode, and achieve silent startup. After the power is turned on, the current forms a magnetic field through the magnetic stator to generate N / S poles, causing the fan to rotate. The stability of the fan speed is regulated by the size of the resistor and the capacitance of the capacitor to achieve the silent experience of the user.

[0011] Preferably, the control circuit is provided with a short-circuit protection resistor R2, and the short-circuit protection resistor R2 is electrically connected to the control module.

[0012] The control circuit of the present utility model is provided with a short-circuit protection resistor R2 for short-circuit protection. The output terminal FG / AL of the distribution box of the control module is electrically connected to the short-circuit protection resistor R2, and the grounding terminal of the control module is grounded. The overall circuit has good protection and strong anti-static ability.

[0013] Preferably, an adjusting resistor R3 is connected to the PWM input terminal.

[0014] An adjusting resistor R3 is provided between the PWM input end of the present utility model and the external input.

[0015] Preferably, the length of the rotor is greater than the depth of the copper middle tube, and when the bottom of the rotor contacts the bottom of the copper middle tube, the top of the rotor is higher than the end face of the copper middle tube.

[0016] The length of the rotor of the present utility model must be greater than the depth of the copper middle tube so that when the bottom of the rotor contacts the bottom of the copper middle tube, the top of the rotor can be higher than the end face of the copper middle tube, preventing the fan blade from wearing against the copper middle tube.

[0017] Preferably, a wear-resistant gasket is provided between the bottom of the rotor and the bottom of the copper middle tube.

[0018] A wear-resistant gasket made of mylar material by stamping is provided between the bottom of the rotor and the bottom of the copper middle tube of the present utility model to position the rotor and provide wear resistance, extending the service life of the fan.

[0019] Preferably, a copper cap is fixed to the top of the copper middle tube. A through hole is provided in the center of the copper cap, and the diameter of the through hole is greater than the diameter of the rotor and less than the outer diameter of the bearing.

[0020] A copper cap for fixing the bearing is fixed to the top of the copper middle tube of the present utility model, so that the bearing is clamped in the cavity formed by the copper middle tube and the copper cap, preventing the rotor and the bearing from coming out. A through hole for the rotor to pass through is provided in the center of the copper cap. Therefore, the diameter of the through hole is less than the outer diameter of the bearing and greater than the diameter of the rotor.

[0021] Preferably, a plum blossom snap ring is provided at the bottom of the bearing, and the plum blossom snap ring is clamped and fixed on the rotor.

[0022] A plum blossom snap ring made of mylar material by stamping is provided at the bottom of the bearing of the present utility model. The plum blossom snap ring is clamped and fixed together with the rotor to fix the rotor and prevent the rotor from coming out during operation.

[0023] Preferably, a label is provided at the bottom of the fan frame.

[0024] A label made of PET material is provided at the bottom of the fan frame of the present utility model. The label is provided with a part number code to facilitate the distinction of the fan models.

[0025] The beneficial effects of the present utility model are:

[0026] 1. High precision in speed control, with a high-speed accuracy of + / -5%;

[0027] 2. Good sound, with built-in noise suppression / soft start to suppress peak current / without the need for a voltage regulator tube;

[0028] 3. The PWM curve is flexibly adjustable, and the slope of the PWM curve, the lowest rotation speed, and the stop rotation can be set;

[0029] 4. The FG short - circuit protection provides good protection and strong anti - static ability;

[0030] 5. The semi - cured MCU enables speed control without burning programs and is controlled by the peripheral circuit;

[0031] 6. The design is simple, without the need to write software and algorithms, and is controlled by peripheral hardware;

[0032] 7. The circuit has a great overall cost advantage and has a significant cost advantage compared with the MCU + MOS architecture. Description of the Drawings

[0033] Figure 1 This is a cross - sectional view of the overall structure provided by the embodiment of the present utility model.

[0034] Figure 2 This is an exploded view of the overall structure provided by the embodiment of the present utility model.

[0035] Figure 3 This is the topology diagram of the control circuit provided by the embodiment of the present utility model.

[0036] Among them: 1. Rotor; 2. Copper cap; 3. Bearing; 4. Motor; 5. Plum blossom snap ring; 6. Wear - resistant gasket; 7. Outer frame; 8. Label. Detailed Embodiment

[0037] Embodiment 1:

[0038] This embodiment proposes a silent fan for a vehicle - mounted dust sensor. Referring to Figure 1 and Figure 2 , it includes a rotor 1, a bearing 3, a motor 4, and a fan frame 7. A copper middle tube and a housing made of PBT material are provided inside the fan frame 7. The motor 4 is sleeved outside the copper middle tube. The motor 4 includes a PCBA board and several magnetic stators. The magnetic stators are electrically connected to the PCBA board. The bearing 3 is fixed inside the copper middle tube. The rotor 1 is rotatably connected inside the bearing 3. The rotor 1 is provided with fan blades distributed inside the housing, and the end face of the rotor is basically flush with the end face of the housing. The PCBA board is provided with a control circuit, and the control circuit regulates the magnetic strength of the magnetic stators to control the rotation speed of the fan blades.

[0039] The present utility model is provided with a label 8 made of PET material at the bottom of the fan frame 7. The label 8 is provided with a part number code to facilitate the distinction of the fan models.

[0040] The magnetic stator of the present utility model includes enameled wire and silicon steel sheet, and the enameled wire is wound around the silicon steel sheet. Referring to Figure 3, the control circuit is provided with a control module, the model of which is the KP90832X control chip. The control module is provided with an output end and a PWM input end. The enameled wire is connected to the output end of the control module. The control module controls the output of the output end of the control module according to the PWM signal received by the PWM input end. The utility model adopts PWM signal control, the PWM curve is flexibly adjustable, the slope of the PWM curve is adjustable / the lowest rotation / stop rotation setting, and at the same time, the rotational speed control accuracy is high, and the high rotational speed has an accuracy of + / -5%.

[0041] Reference Figure 3 , in the control circuit of the utility model, a one-way conduction diode D1 is provided on the input side of the control module. The external power supply is connected to the input end of the one-way conduction diode D1. The output end of the one-way conduction diode D1 is connected in parallel to the voltage input end of the control module and one end of a resistor R1. The other end of the resistor R1 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is grounded. The purpose of such a setting in the utility model is to have built-in noise suppression, soft start to suppress peak current, no need for a voltage stabilizing tube, and achieve silent start. After the power is turned on, the current passes through the magnetic stator to form a magnetic field to generate N / S poles, causing the fan to operate. The stability of the fan speed is regulated by the resistance and the capacitance value of the capacitor to achieve the silent experience of users.

[0042] Reference Figure 3 , the control circuit of the utility model is provided with a short-circuit protection resistor R2 for short-circuit protection. The power distribution box output end FG / AL of the control module is electrically connected to the short-circuit protection resistor R2, and the grounding end of the control module is grounded. The overall protection of the circuit is good and the anti-static ability is strong. There is an adjusting resistor R3 between the PWM input end of the utility model and the external input.

[0043] Through the design optimization of the PCBA board, the utility model has high rotational speed control accuracy with an accuracy of + / -5% for high rotational speed; good sound, with built-in noise suppression / soft start to suppress peak current / no need for a voltage stabilizing tube; the PWM curve is flexibly adjustable, the slope of the PWM curve is adjustable / the lowest rotation / stop rotation setting; FG short-circuit protection makes the protection good and the anti-static ability strong; semi-cured MCU, the rotational speed control does not require program burning and is controlled by the peripheral circuit; the design is simple, there is no need to write software and algorithms, and it is controlled by the peripheral hardware; the comprehensive cost advantage of the circuit is large, and there is a significant cost advantage compared with the MCU+MOS architecture.

[0044] Embodiment 2:

[0045] In this embodiment, on the basis of Embodiment 1, the fixing method of the bearing 3 is improved, and a silent fan for a vehicle-mounted dust sensor is proposed. Reference Figure 1 and Figure 2, including a rotor 1, a bearing 3, a motor 4 and a fan frame 7. Inside the fan frame 7, there is a copper middle tube and a housing made of PBT material. The motor 4 is sleeved outside the copper middle tube. The motor 4 includes a PCBA board and several magnetic stators. The magnetic stators are electrically connected to the PCBA board. The bearing 3 is fixed inside the copper middle tube. The rotor 1 is rotatably connected inside the bearing 3. On the rotor 1, there are fan blades distributed inside the housing, and the end face of the rotor is basically flush with the end face of the housing. The PCBA board is provided with a control circuit, and the control circuit regulates the magnetic strength of the magnetic stators to control the rotation speed of the fan blades.

[0046] At the top of the copper middle tube of the present utility model, there is a copper cap for fixing the bearing 2, so that the bearing is clamped in the cavity formed by the copper middle tube and the copper cap, preventing the rotor 1 and the bearing 3 from coming out. There is a through hole in the center of the copper cap for the rotor 1 to pass through. For this purpose, the diameter of the through hole is smaller than the outer diameter of the bearing 3 and larger than the diameter of the rotor 1.

[0047] At the bottom of the bearing 3 of the present utility model, there is a plum blossom snap ring 5 made of mylar material by stamping. The plum blossom snap ring 5 is clamped and fixed with the rotor 1 to fix the rotor 1 and prevent it from coming out during operation.

[0048] At the bottom of the fan frame 7 of the present utility model, there is a label 8 made of PET material. The label 8 is provided with a part number code, which is convenient for distinguishing the models of the fans.

[0049] The magnetic stator of the present utility model includes an enameled wire and a silicon steel sheet. The enameled wire is wound around the silicon steel sheet. Refer to Figure 3 , the control circuit is provided with a control module, and its model is KP90832X control chip. The control module is provided with an output end and a PWM input end. The enameled wire is connected to the output end of the control module. The control module controls the output of the output end of the control module according to the PWM signal received by the PWM input end. The present utility model adopts PWM signal control, the PWM curve is flexibly adjustable, the slope of the PWM curve is adjustable / minimum rotation / stop rotation setting, and at the same time, the rotation speed control accuracy is high, with a high rotation speed accuracy of + / - 5%.

[0050] Refer to Figure 3, a unidirectional conduction diode D1 is provided on the input side of the control module of the control circuit of the present utility model. The external power supply is connected to the input end of the unidirectional conduction diode D1. The output end of the unidirectional conduction diode D1 is connected in parallel to the voltage input end of the control module and one end of a resistor R1. The other end of the resistor R1 is connected to one end of a capacitor C1, and the other end of the capacitor C1 is grounded. The purpose of such a setting of the present utility model is to perform built-in noise suppression, soft start to suppress peak current, without the need for a voltage stabilizing diode, and achieve start-up silence. After the power is turned on, the current passes through the magnetic stator to form a magnetic field to generate N / S poles, causing the fan to rotate. The stability of the fan speed is regulated by the resistance and the capacitance value of the capacitor to achieve the user's silent experience.

[0051] Reference Figure 3 , the control circuit of the present utility model is provided with a short-circuit protection resistor R2 for short-circuit protection. The power distribution box output end FG / AL of the control module is electrically connected to the short-circuit protection resistor R2, and the grounding end of the control module is grounded. The overall protection of the circuit is good, and the anti-static ability is strong. An adjusting resistor R3 is provided between the PWM input end of the present utility model and the external input.

[0052] Through the design optimization of the PCBA board, the present utility model has high precision in speed control, with a high-speed accuracy of + / -5%; good sound quality, built-in noise suppression / soft start to suppress peak current / without the need for a voltage stabilizing diode; the PWM curve is flexibly adjustable, the PWM curve slope is adjustable / the lowest speed / stop rotation setting; FG short-circuit protection makes the protection good and the anti-static ability strong; semi-cured MCU, speed control does not require program burning, and is controlled by the peripheral circuit; the design is simple, no software and algorithms are required, and it is controlled by the peripheral hardware; the overall cost advantage of the circuit is large, and there is a significant cost advantage compared with the MCU+MOS architecture.

[0053] Embodiment 3:

[0054] Based on Embodiment 2, the height of the rotor 1 is limited in this embodiment, and a silent fan for a vehicle-mounted dust sensor is proposed, reference Figure 1 and Figure 2 , including a rotor 1, a bearing 3, a motor 4 and a fan frame 7. A copper middle tube and a housing made of PBT material are provided inside the fan frame 7. The motor 4 is sleeved outside the copper middle tube. The motor 4 includes a PCBA board and a plurality of magnetic stators. The magnetic stators are electrically connected to the PCBA board. The bearing 3 is fixed inside the copper middle tube. The rotor 1 is rotatably connected inside the bearing 3. The rotor 1 is provided with fan blades distributed inside the housing, and the end face of the rotor is basically flush with the end face of the housing. The PCBA board is provided with a control circuit, and the control circuit regulates the magnetic strength of the magnetic stators to control the rotation speed of the fan blades.

[0055] The length of the rotor 1 of the present utility model must be greater than the depth of the copper middle tube, so that when the bottom of the rotor 1 contacts the bottom of the copper middle tube, the top of the rotor 1 can be higher than the end face of the copper middle tube, preventing the fan blade from wearing against the copper middle tube. A wear-resistant gasket made of Mylar material by stamping is provided between the bottom of the rotor 1 of the present utility model and the bottom of the copper middle tube, which is used to limit the position of the rotor 1 and provide wear-resistant effect, extending the service life of the fan.

[0056] A copper cap for fixing the bearing 2 is fixed to the top of the copper middle tube of the present utility model, so that the bearing is clamped in the cavity formed by the copper middle tube and the copper cap, preventing the rotor 1 and the bearing 3 from coming out. A through hole for the rotor 1 to pass through is provided in the center of the copper cap. For this purpose, the diameter of the through hole is smaller than the outer diameter of the bearing 3 and larger than the diameter of the rotor 1.

[0057] A plum blossom snap ring 5 made of Mylar material by stamping is provided at the bottom of the bearing 3 of the present utility model. The plum blossom snap ring 5 is clamped and fixed together with the rotor 1 to fix the rotor 1 and prevent it from coming out during operation.

[0058] A label 8 made of PET material is provided at the bottom of the fan frame 7 of the present utility model. The label 8 is provided with a part number code for easy distinction of the fan models.

[0059] The magnetic stator of the present utility model includes an enameled wire and a silicon steel sheet. The enameled wire is wound around the silicon steel sheet. Refer to Figure 3 , the control circuit is provided with a control module, and its model is the KP90832X control chip. The control module is provided with an output end and a PWM input end. The enameled wire is connected to the output end of the control module. The control module controls the output of the output end of the control module according to the PWM signal received by the PWM input end. The present utility model adopts PWM signal control, the PWM curve is flexibly adjustable, the slope of the PWM curve is adjustable / minimum rotation / stop rotation setting, and at the same time, the rotational speed control accuracy is high, with a high rotational speed accuracy of + / - 5%.

[0060] Refer to Figure 3 , a one-way conduction diode D1 is provided on the input side of the control module of the control circuit of the present utility model. The external power supply is connected to the input end of the one-way conduction diode D1. The output end of the one-way conduction diode D1 is connected in parallel to the voltage input end of the control module and one end of a resistor R1. The other end of the resistor R1 is connected to one end of a capacitor C1. The other end of the capacitor C1 is grounded. The purpose of such a setting of the present utility model is to build-in noise suppression, soft start to suppress peak current, without the need for a voltage stabilizing tube, and achieve silent start. After the power is turned on, the current forms a magnetic field through the magnetic stator to generate N / S poles, making the fan operate, and the stability of the fan rotational speed is regulated by the size of the resistor and the capacitance of the capacitor to achieve the silent experience of the user.

[0061] Refer toFigure 3 , the control circuit of the present utility model is provided with a short - circuit protection resistor R2 for short - circuit protection. The FG / AL output terminal of the distribution box of the control module is electrically connected to the short - circuit protection resistor R2, and the grounding terminal of the control module is grounded. The overall circuit has good protection performance and strong anti - static ability. An adjusting resistor R3 is provided between the PWM input terminal of the present utility model and the external input.

[0062] Through the design optimization of the PCBA board, the present utility model has high precision in speed control, with a high - speed accuracy of + / -5%; good sound quality, built - in noise suppression / soft - start suppression peak current / does not require a voltage - stabilizing tube; the PWM curve is flexibly adjustable, the PWM curve slope is adjustable / the lowest speed / stop - rotation setting; FG short - circuit protection results in good protection performance and strong anti - static ability; semi - cured MCU, speed control does not require program burning and is controlled by the peripheral circuit; simple design, no software and algorithm writing are required, and it is controlled by peripheral hardware; the overall circuit has a great cost advantage, with a significant cost advantage compared to the MCU + MOS architecture.

Claims

1. A silent fan for a vehicle-mounted dust sensor, characterized in that, It includes a fan frame (7), a copper middle tube is arranged inside the fan frame (7), a motor (4) is sleeved outside the copper middle tube, the motor (4) includes a plurality of magnetic stators, the magnetic stators are connected to a PCBA board, a bearing (3) is fixed inside the copper middle tube, a rotor (1) is rotatably connected inside the bearing (3), a fan blade is arranged on the rotor (1), and the PCBA board is provided with a control circuit for regulating the magnetic strength of the magnetic stators.

2. The silent fan for a vehicle-mounted dust sensor according to claim 1, wherein The magnetic stator includes a silicon steel sheet and an enameled wire wound around the silicon steel sheet. The control circuit is provided with a control module. The control module is provided with a PWM input terminal. The output terminal of the control module is connected to the enameled wire. The control module controls the output of the output terminal of the control module according to the PWM signal received by the PWM input terminal.

3. The silent fan for vehicle-mounted dust sensor according to claim 2, characterized in that, The control circuit is provided with a one-way conduction diode D1. The input terminal of the one-way conduction diode D1 is connected to an external power supply. The output terminal of the one-way conduction diode D1 is connected in parallel to one end of a resistor R1 and the voltage input terminal of the control module. The other end of the resistor R1 is grounded through a capacitor C1.

4. The silent fan for a vehicle-mounted dust sensor according to claim 2, wherein The control circuit is provided with a short-circuit protection resistor R2, and the short-circuit protection resistor R2 is electrically connected to the control module.

5. The silent fan for vehicle-mounted dust sensor according to claim 3, characterized in that, The PWM input terminal is connected with an adjusting resistor R3.

6. A silent fan for an in-vehicle dust sensor according to any one of claims 1-5, characterized in that, The length of the rotor (1) is greater than the depth of the copper middle tube, and when the bottom of the rotor (1) contacts the bottom of the copper middle tube, the top of the rotor (1) is higher than the end face of the copper middle tube.

7. The silent fan for an in-vehicle dust sensor according to claim 6, characterized in that, A wear-resistant gasket is arranged between the rotor (1) and the bottom of the copper middle tube.

8. The silent fan for a vehicle-mounted dust sensor according to claim 6, wherein, A copper cap (2) is fixed at the top of the copper middle tube. A through hole is arranged at the center of the copper cap (2). The diameter of the through hole is greater than the diameter of the rotor (1) and less than the outer diameter of the bearing (3).

9. The silent fan for an in-vehicle dust sensor according to claim 8, characterized in that, A plum blossom snap ring (5) is arranged at the bottom of the bearing (3), and the plum blossom snap ring (5) is clamped and fixed on the rotor (1).

10. The silent fan for a vehicle-mounted dust sensor according to claim 1, characterized in that, A label (8) is arranged at the bottom of the fan frame (7).

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