Wide-voltage speed-adjustable cooling fan

Abstract

The utility model belongs to the technical field of cooling fans, and particularly relates to a wide-voltage speed-adjustable cooling fan which is characterized by comprising a fan assembly and a driving circuit board, the fan assembly comprises a supporting frame, a rotating motor and fan blades which are connected in sequence, and the driving circuit board is fixedly arranged in the supporting frame. The driving circuit board is provided with a power supply input end, a direct current step-down chip, an adjustable resistor and a power supply output end which are electrically connected in sequence, and the power supply output end is electrically connected with the rotating motor. According to the scheme, the circuit board with the voltage reduction chip and the adjustable resistor is arranged in the cooling fan, the cooling fan can adapt to various input voltages, the rotating speed of the fan can be adjusted through the adjustable resistor, the cooling requirements of devices of different brands and types can be met, the part inventory pressure of manufacturers can be reduced, and the production cost of the devices can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of cooling fan technology, and more specifically, to a wide voltage adjustable speed cooling fan. Background Technology

[0002] Many electronic devices generate heat when their circuit components are running. In particular, chips such as the CPU on a computer motherboard generate a lot of heat during operation, requiring cooling fans to continuously cool them down and ensure the device can run for extended periods.

[0003] The current cooling fan solution used on computer motherboards is shown in patent document CN202323664176.0, entitled "A Cooling Device for Ensuring Stable Operation of Computer Applications." This cooling device connects to the computer motherboard via four symmetrically arranged mounting posts. Heat generated by the motherboard after power-on is transferred to the cooling device. A circulating water pipe is fixed inside the cavity of the cooling device. Two sets of cooling fans, one on the left and one on the right, are fixed to the right side of the device's housing with screws. These fans cool the circulating water pipe. A water outlet nut on the lower right side of the cooling device connects to the water inlet valve on the top of the water tank via a rubber hose. The water outlet valve on the top of the water tank connects to the water inlet on the right side of a miniature water pump via a rubber hose. The cooling fans are powered by a power cord connected to the computer motherboard's DC connector to cool the motherboard. The cooling fans are anti-static fans, removing dust from electronic components and inside the computer case, ensuring stable computer operation.

[0004] However, since the cooling fans of the aforementioned heat dissipation devices require power from the DC connector on the computer motherboard and have a fixed speed, the cooling fans must use models that match the current and voltage output of the DC connector and have a suitable cooling speed. To adapt to the DC output connectors on various brands and models of circuit boards, multiple specifications of cooling fan parts need to be prepared and matched during the assembly and production of computers and other electronic products. This process is cumbersome and makes it difficult to control production and inventory costs. Utility Model Content

[0005] To address the issue that existing DC cooling fans can only operate at a fixed voltage and with a fixed speed, requiring manufacturers to prepare various specifications of cooling fan parts and connect them to corresponding circuit boards for testing and matching during electronic product manufacturing, which is cumbersome and makes it difficult to control the cost of parts inventory, we provide a wide-voltage adjustable speed cooling fan.

[0006] A wide-voltage adjustable speed cooling fan includes a fan assembly and a drive circuit board. The fan assembly includes a support frame, a rotary motor, and fan blades connected in sequence. The drive circuit board is fixedly disposed in the support frame. The drive circuit board is provided with a power input terminal, a DC step-down chip, an adjustable resistor, and a power output terminal connected in sequence. The power output terminal is electrically connected to the rotary motor.

[0007] Furthermore, the output end of the rotary motor is fixedly connected to the fan blade, and the rotary motor, fan blade, and drive circuit board are all installed in the support frame.

[0008] Furthermore, the drive circuit board is ring-shaped, and the rotary motor is connected in series in the through hole in the middle of the drive circuit board.

[0009] Furthermore, a circular slot seat is provided in the middle of the inner side of the support frame, and the drive circuit board and the rotary motor are both installed in the circular slot seat.

[0010] Furthermore, the adjustable resistor is located on the back of the drive circuit board, and an adjustment slot is provided on the support frame corresponding to the adjustable resistor.

[0011] Furthermore, a wiring groove for connecting the power input terminal is provided on the outer side of the support frame.

[0012] Furthermore, the support frame is provided with a front and rear connected guide shroud, and the fan blade is wrapped and installed in the guide shroud, with the front end of the guide shroud protruding from the front end of the fan blade.

[0013] Furthermore, the outer side of the support frame is provided with a plurality of internal thread seats, the openings of the internal thread seats and the side of the support frame being on the same plane.

[0014] Furthermore, the DC-DC step-down chip is model OC5864, and the FB pin of the DC-DC step-down chip is electrically connected to an adjustable resistor.

[0015] The advantages of this utility model are:

[0016] 1. A DC step-down chip is built into the cooling fan to adjust different input voltages to the working voltage of the cooling fan motor, so that the cooling fan can support the output power drive of various circuit boards and has strong adaptability.

[0017] 2. The built-in fan speed control function is realized by utilizing the adjustable resistor on the cooling fan circuit board, which can easily adapt to the heat dissipation needs of various devices.

[0018] 3. The structure is compact and highly integrated, making it easy to install on various equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a wide-voltage adjustable-speed cooling fan;

[0021] Figure 2 This is a schematic diagram of the back structure of a wide voltage adjustable speed cooling fan.

[0022] Figure 3 Exploded view of a wide voltage adjustable speed cooling fan;

[0023] Figure 4 This is the circuit schematic for the drive circuit board.

[0024] Attached image labels:

[0025] 1. Fan assembly; 101. Support frame; 102. Rotary motor; 103. Fan blades; 104. Air guide; 2. Drive circuit board; 201. Power input terminal; 202. DC step-down chip; 203. Adjustable resistor; 204. Power output terminal; 3. Circular slot holder; 4. Adjustment through slot; 5. Wiring guide slot; 6. Power supply wiring; 7. Internal threaded seat. Detailed Implementation

[0026] To address the issue that existing DC cooling fans can only operate at a fixed voltage and with a fixed speed, requiring manufacturers to prepare various specifications of cooling fan parts and connect them to corresponding circuit boards for testing and matching during electronic product manufacturing, which is cumbersome and makes it difficult to control the cost of parts inventory, we provide a wide-voltage adjustable speed cooling fan.

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] It should be noted that the terms such as "inner", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of implementation of this utility model, as stated above.

[0029] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

[0030] like Figures 1 to 4 As shown, this embodiment provides a wide voltage adjustable speed cooling fan, including a fan assembly 1 and a drive circuit board 2. The fan assembly 1 includes a support frame 101, a rotary motor 102 and a fan blade 103 connected in sequence. The drive circuit board 2 is fixedly disposed in the support frame 101. The drive circuit board 2 is provided with a power input terminal 201, a DC step-down chip 202, an adjustable resistor 203 and a power output terminal 204 connected in sequence. The power output terminal 204 is electrically connected to the rotary motor 102.

[0031] Because the cooling fan incorporates a built-in DC-DC step-down chip 202 that processes and converts the power supply, and features an adjustable resistor 203 to regulate the output current, the cooling fan can support various input voltages. Furthermore, the fan speed can be quickly adjusted by changing the resistance of the adjustable resistor 203, making it convenient and highly adaptable. This embodiment helps reduce parts warehousing costs and product assembly costs for manufacturing companies, thereby improving production efficiency.

[0032] The output end of the rotary motor 102 is fixedly connected to the fan blade 103. The rotary motor 102, fan blade 103, and drive circuit board 2 are all installed in the support frame 101. All components are installed in the support frame 101, resulting in high integration, small footprint, and convenient installation.

[0033] The drive circuit board 2 is ring-shaped, and the rotary motor 102 is connected in series in the through hole in the middle of the drive circuit board 2. The ring-shaped drive circuit board 2, combined with the built-in motor design, can effectively reduce the assembly volume.

[0034] A circular slotted bracket 3 is provided in the middle of the inner side of the support frame 101, and the drive circuit board 2 and the rotary motor 102 are both installed in the circular slotted bracket 3. The circular slotted bracket 3 facilitates workers to quickly locate the installation positions of each component, improving assembly efficiency. On the other hand, it can prevent the drive circuit board 2 and the rotary motor 102 from shaking and shifting, improving the structural stability.

[0035] The adjustable resistor 203 is located on the back of the drive circuit board 2, and an adjustment slot 4 is provided on the support frame 101 corresponding to the adjustable resistor 203. The adjustable resistor 203 located on the back of the cooling fan is convenient for operators to adjust and switch.

[0036] The outer side of the support frame 101 is provided with a wiring guide groove 5 that connects to the power input terminal 201. The wiring guide groove 5 can guide the direction of the power supply wire 6 connected to the power input terminal 201 and prevent the power supply wire 6 from colliding with the fan blade 103.

[0037] The support frame 101 is provided with a front-to-back airflow guide shroud 104, and the fan blade 103 is enclosed and installed in the airflow guide shroud 104, with the front end of the airflow guide shroud 104 protruding beyond the front end of the fan blade 103. The concave design of the fan blade 103 makes it less likely to collide with foreign objects when rotating, and also prevents the user from contacting the running fan blade 103, ensuring equipment safety.

[0038] The outer side of the support frame 101 is provided with multiple internal thread seats 7, and the openings of the internal thread seats 7 are on the same plane as the side of the support frame 101. Commercially available cooling fans are generally installed vertically and require a bracket for fixation. However, with the internal thread seats 7, this embodiment can be directly fixed to the device housing or other structures using screws, eliminating the need for a bracket. Furthermore, multiple internal thread seats 7 on different sides can be fixed simultaneously, reducing the likelihood of fan loosening, resonance, or abnormal noise.

[0039] The DC-DC step-down chip 202, model OC5864, has its FB pin electrically connected to an adjustable resistor 203. It is a monolithic step-down switch-mode converter with a built-in power MOSFET and a peak output current of 0.6A, ensuring a continuous and stable conversion of the input power to a specification suitable for the cooling fan. With the motor operating voltage constant, adjusting the resistance of the adjustable resistor 203 can regulate the current output from the power output terminal 204, thereby adjusting the speed of the cooling fan.

[0040] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be assumed that the specific implementation of the present utility model is limited to these descriptions. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present utility model.

Claims

1. A wide-voltage adjustable speed cooling fan, characterized in that, The device includes a fan assembly and a drive circuit board. The fan assembly includes a support frame, a rotary motor, and fan blades connected in sequence. The drive circuit board is fixedly disposed in the support frame. The drive circuit board is provided with a power input terminal, a DC step-down chip, an adjustable resistor, and a power output terminal connected in sequence. The power output terminal is electrically connected to the rotary motor.

2. The wide voltage adjustable speed cooling fan according to claim 1, characterized in that, The output end of the rotary motor is fixedly connected to the fan blade, and the rotary motor, fan blade and drive circuit board are all installed in the support frame.

3. The wide voltage adjustable speed cooling fan according to claim 2, characterized in that, The drive circuit board is ring-shaped, and the rotary motor is connected in series in the through hole in the middle of the drive circuit board.

4. The wide voltage adjustable speed cooling fan according to claim 3, characterized in that, A circular slot seat is provided in the middle of the inner side of the support frame, and the drive circuit board and the rotary motor are both installed in the circular slot seat.

5. The wide voltage adjustable speed cooling fan according to claim 4, characterized in that, The adjustable resistor is located on the back of the drive circuit board, and an adjustment slot is provided on the support frame corresponding to the adjustable resistor.

6. The wide voltage adjustable speed cooling fan according to claim 4, characterized in that, The outer side of the support frame is provided with a wiring groove for connecting the power input terminal.

7. The wide voltage adjustable speed cooling fan according to claim 1, characterized in that, The support frame is provided with a front and rear connected guide shroud, and the fan blade is wrapped and installed in the guide shroud, with the front end of the guide shroud protruding from the front end of the fan blade.

8. The wide voltage adjustable speed cooling fan according to claim 1, characterized in that, The outer side of the support frame is provided with a plurality of internal thread seats, and the openings of the internal thread seats are on the same plane as the side of the support frame.

9. The wide voltage adjustable speed cooling fan according to claim 1, characterized in that, The DC-DC step-down chip is model OC5864, and the FB pin of the DC-DC step-down chip is electrically connected to an adjustable resistor.

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