A cooling fan for an unmanned helicopter

Abstract

The utility model relates to a cooling fan of unmanned helicopter belongs to unmanned helicopter technical field, solved in order to drive the heat dissipation fan of unmanned helicopter in prior art, a series of energy conversion of mechanical energy to electric energy, electric energy to chemical energy, chemical to the electric energy required by fan, cause the problem of energy loss. The utility model discloses fan drive unit, drive belt and fan blade, the fan blade sets up the end of fan drive unit, drive belt can connect the power output shaft of unmanned helicopter's engine, and the rotation of power output shaft is given to fan drive unit. The mechanical energy of unmanned helicopter engine is directly transmitted to the cooling fan of the utility model, need not experience a series of energy conversion of mechanical energy to electric energy, electric energy to chemical energy, chemical to the electric energy required by fan, reduce energy loss.

Description

Technical Field

[0001] This utility model belongs to the field of unmanned helicopter technology, and in particular relates to a cooling fan for unmanned helicopters. Background Technology

[0002] Current unmanned helicopters primarily use piston engines for power. Piston engines generate a significant amount of heat during operation, resulting in very high engine temperatures. To ensure normal engine operation, cooling is essential. Therefore, unmanned helicopters are equipped with both water-cooled and intercooled radiators to dissipate heat. The radiators are fitted with fans, which increase airflow to improve cooling efficiency.

[0003] Fans are usually driven by a dedicated motor. So, in order to drive the fan, the mechanical energy of the piston engine must first be converted into the electrical energy of the generator, then the electrical energy of the generator into the chemical energy of the battery, and finally the chemical energy of the battery into the electrical energy required by the fan motor, resulting in a large amount of energy loss. Utility Model Content

[0004] Based on the above analysis, the present invention aims to provide a cooling fan for unmanned helicopters, solving the problem in the prior art that in order to drive the cooling fan of an unmanned helicopter, a series of energy conversions are required, from mechanical energy to electrical energy, from electrical energy to chemical energy, and from chemical energy to the electrical energy needed for the fan, resulting in a large amount of energy loss.

[0005] The objective of this utility model is mainly achieved through the following technical solutions:

[0006] A cooling fan for an unmanned helicopter includes a fan drive unit, a drive belt, and fan blades. The fan blades are disposed at the end of the fan drive unit. The drive belt connects the power output shaft of the unmanned helicopter's engine to the fan drive unit, transmitting the rotation of the power output shaft to the fan drive unit. Part of the mechanical energy of the unmanned helicopter's engine is directly transferred to the cooling fan of this embodiment, without undergoing a series of energy conversions from mechanical energy to electrical energy, electrical energy to chemical energy, and chemical energy to the electrical energy required by the fan blades, thus reducing energy loss.

[0007] Furthermore, it also includes a tension adjustment unit, which is sleeved on the fan drive unit. The tension adjustment unit is used to adjust the distance between the power output shaft and the fan drive unit, thereby adjusting the tension of the drive belt.

[0008] Furthermore, the fan drive unit includes a fan wheel and a fan shaft. The fan wheel is disposed at one end of the fan shaft, and the fan blades are disposed at the other end of the fan shaft. The fan wheel is coaxial with the fan shaft. The drive belt can be connected to the fan wheel and transmit the rotation of the power output shaft to the fan wheel, and is used to drive the fan blades to rotate.

[0009] Furthermore, the tension adjustment unit includes a variable shaft sleeve, which is sleeved on the fan shaft.

[0010] Furthermore, it also includes a locking unit for connecting the tension adjustment unit to the main frame of the unmanned helicopter and preventing the tension adjustment unit from rotating.

[0011] Furthermore, the locking unit includes a housing, which includes a first locking part, a second locking part, and a locking part.

[0012] Furthermore, the clamping part is a cylindrical clamping part with a side opening, and the clamping part is used to clamp the variable shaft sleeve.

[0013] Furthermore, the first locking part and the second locking part are respectively disposed on the side walls on both sides of the side opening of the clamping part; the first locking part is used to connect with the main frame.

[0014] Furthermore, the locking unit also includes a locking screw, which is used to change the distance between the first locking part and the second locking part, thereby adjusting the clamping degree between the clamping part and the variable shaft sleeve.

[0015] Furthermore, the tension adjustment unit also includes a flange, which is disposed at one end of the variable shaft sleeve; the flange is rotated with a wrench, thereby causing the variable shaft sleeve to rotate circumferentially.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) The drive belt of this utility model can connect the power output shaft of the engine of the unmanned helicopter to the fan drive unit, and transmit the rotation of the power output shaft to the fan drive unit. Part of the mechanical energy of the engine of the unmanned helicopter is directly transmitted to the cooling fan of this embodiment, without having to go through a series of energy conversions from mechanical energy to electrical energy, electrical energy to chemical energy, and chemical energy to the electrical energy required by the fan blades, thus reducing energy loss.

[0018] (2) The tension adjustment unit of this utility model is used to adjust the distance between the power output shaft and the fan drive unit, thereby adjusting the tension of the drive belt. Compared with the transmission mechanism of the prior art which requires a separate tension wheel, this utility model sets the fan drive unit and the tension adjustment unit as a whole, eliminating the separate tension wheel. The cooling fan occupies less space in the unmanned helicopter, saving space in the main frame of the unmanned helicopter.

[0019] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 This is a schematic diagram of the overall structure of the cooling fan;

[0022] Figure 2 A schematic diagram of the overall structure of the fan drive unit and the tension adjustment unit;

[0023] Figure 3 This is a schematic diagram of the overall structure of the locking unit.

[0024] Figure label:

[0025] 1-Fan drive unit; 2-Drive belt; 3-Fan blade; 4-Tightness adjustment unit; 5-Locking unit; 11-Fan wheel; 12-Fan shaft; 41-Variable shaft sleeve; 42-Flange; 51-Enclosure; 52-Locking screw; 100-Power output shaft; 200-Main frame. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0027] A specific embodiment of this utility model is as follows: Figure 1As shown, a cooling fan for an unmanned helicopter is disclosed, including a fan drive unit 1, a drive belt 2, and fan blades 3. The fan blades 3 are disposed at the end of the fan drive unit 1. The drive belt 2 can connect the engine power output shaft 100 of the unmanned helicopter to the fan drive unit 1, transmitting the rotation of the power output shaft 100 to the fan drive unit 1. Part of the mechanical energy of the unmanned helicopter's engine is directly transmitted to the cooling fan of this embodiment, without having to undergo a series of energy conversions from mechanical energy to electrical energy, electrical energy to chemical energy, and chemical energy to the fan blades 3 which require electrical energy, thus reducing energy loss.

[0028] Preferably, it also includes a tension adjustment unit 4, which is sleeved on the fan drive unit 1. The tension adjustment unit 4 is used to adjust the distance between the power output shaft 100 and the fan drive unit 1, thereby adjusting the tension of the drive belt 2. Compared with the prior art which requires a separate tensioning wheel, this embodiment sets the fan drive unit 1 and the tension adjustment unit 4 as a whole, eliminating the need for a separate tensioning wheel. The cooling fan of this embodiment occupies less space on the unmanned helicopter, saving space on the main frame of the unmanned helicopter.

[0029] Preferred, such as Figure 2 As shown, the fan drive unit 1 includes a fan wheel 11 and a fan shaft 12. The fan wheel 11 is located at one end of the fan shaft 12, and the fan blades 3 are located at the other end of the fan shaft 12. The fan wheel 11 and the fan shaft 12 are coaxial. The drive belt 2 can be connected to the fan wheel 11 and transmit the rotation of the power output shaft 100 to the fan wheel 11, and is used to drive the fan blades 3 to rotate.

[0030] Preferably, the tension adjustment unit 4 includes a variable shaft sleeve 41, which is sleeved on the fan shaft 12. The central axis of the power output shaft 100 is parallel to the central axis of the fan shaft 12; the central axis of the fan shaft 12 is parallel to the central axis of the variable shaft sleeve 41. Circumferentially rotating the variable shaft sleeve 41 allows the fan shaft 12 to rotate around the central axis of the variable shaft sleeve 41, thereby changing the wheelbase between the fan wheel 11 and the power output shaft 100, achieving the purpose of adjusting the tension of the drive belt 2.

[0031] Preferably, the tension adjustment unit 4 further includes a bearing, which is disposed between the variable shaft sleeve 41 and the fan shaft 12. The bearing is used to reduce the friction between the variable shaft sleeve 41 and the fan shaft 12, while preventing the fan shaft 12 from axially disengaging from the variable shaft sleeve 41.

[0032] Preferred, such as Figure 3 As shown, the cooling fan in this embodiment also includes a locking unit 5, which is used to connect the tension adjustment unit 4 to the main frame 200 of the unmanned helicopter and prevent the tension adjustment unit 4 from rotating.

[0033] Preferably, the locking unit 5 includes a housing 51, which includes a first locking part, a second locking part, and a clamping part. The clamping part is a cylindrical clamping part with a side opening, and is used to clamp the variable shaft sleeve 41. The first locking part and the second locking part are respectively disposed on the side walls on both sides of the side opening of the clamping part. The first locking part is used to connect with the main frame 200.

[0034] Preferably, in order to clamp and fix the variable shaft sleeve 41, the locking unit 5 further includes a locking screw 52. The locking screw 52 is used to change the distance between the first locking part and the second locking part, thereby adjusting the clamping degree between the locking part and the variable shaft sleeve 41. Loosening the locking screw 52 allows the variable shaft sleeve 41 to rotate within the housing 51, thereby adjusting the wheelbase between the fan wheel 11 and the power output shaft 100; tightening the locking screw 52 allows the locking part to clamp the variable shaft sleeve 41, preventing the variable shaft sleeve 41 from rotating within the housing 51 and ensuring that the wheelbase between the fan wheel 11 and the power output shaft 100 remains unchanged.

[0035] Preferred, such as Figure 2 As shown, in order to rotate the variable shaft sleeve 41 circumferentially, the tension adjustment unit 4 also includes a flange 42, which is disposed at one end of the variable shaft sleeve 41. The flange 42 can be rotated with a wrench, thereby causing the variable shaft sleeve 41 to rotate circumferentially. The flange 42 is a hexagonal flange.

[0036] Compared with the prior art, the drive belt 2 in this embodiment can connect the power output shaft 100 of the unmanned helicopter engine to the fan drive unit 1, transmitting the rotation of the power output shaft 100 to the fan drive unit 1. Part of the mechanical energy of the unmanned helicopter engine is directly transferred to the cooling fan of this embodiment, eliminating the need for a series of energy conversions: mechanical energy to electrical energy, electrical energy to chemical energy, and chemical energy to the electrical energy required by the fan blades 3, thus reducing energy loss. The tension adjustment unit 4 in this embodiment is used to adjust the distance between the power output shaft 100 and the fan drive unit 1, thereby adjusting the tension of the drive belt 2. Compared to the prior art transmission mechanism which requires a separate tensioning wheel, this embodiment... The drive unit 1 and the tension adjustment unit 4 are set as a whole, eliminating the need for a separate tension wheel. The cooling fan in this embodiment occupies less space in the unmanned helicopter, saving space in the main frame of the unmanned helicopter. The tension adjustment unit 4 includes a variable shaft sleeve 41, which is sleeved on the fan shaft 12. The central axis of the power output shaft 100 is parallel to the central axis of the fan shaft 12. The central axis of the fan shaft 12 is parallel to the central axis of the variable shaft sleeve 41. Circumferentially rotating the variable shaft sleeve 41 allows the fan shaft 12 to rotate around the central axis of the variable shaft sleeve 41, thereby changing the wheelbase between the fan wheel 11 and the power output shaft 100, achieving the purpose of adjusting the tension of the drive belt 2.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling fan for an unmanned helicopter, characterized in that, The system includes a fan drive unit (1), a drive belt (2), fan blades (3), and a tension adjustment unit (4). The fan blades (3) are located at the end of the fan drive unit (1). The drive belt (2) can connect the power output shaft (100) of the unmanned helicopter engine to the fan drive unit (1) and transmit the rotation of the power output shaft (100) to the fan drive unit (1). The tension adjustment unit (4) is sleeved on the fan drive unit (1) and is used to adjust the distance between the power output shaft (100) and the fan drive unit (1), thereby adjusting the tension of the drive belt (2). The fan drive unit (1) includes a fan wheel (11) and a fan shaft (12); the tension adjustment unit (4) includes a variable shaft sleeve (41), which is sleeved on the fan shaft (12) of the fan drive unit (1); the central axis of the fan shaft (12) is parallel to the central axis of the variable shaft sleeve (41); circumferential rotation of the variable shaft sleeve (41) can make the fan shaft (12) rotate around the central axis of the variable shaft sleeve (41), thereby changing the wheelbase between the fan wheel (11) and the power output shaft (100), and adjusting the tension of the drive belt (2).

2. The cooling fan of the unmanned helicopter according to claim 1, characterized in that, The fan wheel (11) is located at one end of the fan shaft (12), and the fan blade (3) is located at the other end of the fan shaft (12). The fan wheel (11) is coaxial with the fan shaft (12). The drive belt (2) can be connected to the fan wheel (11) and transmit the rotation of the power output shaft (100) to the fan wheel (11) and drive the fan blade (3) to rotate.

3. The cooling fan of the unmanned helicopter according to claim 2, characterized in that, It also includes a locking unit (5) for connecting the tension adjustment unit (4) to the main frame (200) of the unmanned helicopter and preventing the tension adjustment unit (4) from rotating.

4. The cooling fan of the unmanned helicopter according to claim 3, characterized in that, The locking unit (5) includes a housing (51), which includes a first locking part, a second locking part, and a locking part.

5. The cooling fan of the unmanned helicopter according to claim 4, characterized in that, The clamping part is a cylindrical clamping part with a side opening, and the clamping part is used to clamp the variable shaft sleeve (41).

6. The cooling fan of the unmanned helicopter according to claim 5, characterized in that, The first locking part and the second locking part are respectively provided on the side walls on both sides of the side opening of the locking part; the first locking part is used to connect with the main frame (200).

7. The cooling fan of the unmanned helicopter according to claim 4, characterized in that, The locking unit (5) also includes a locking screw (52), which is used to change the distance between the first locking part and the second locking part, thereby adjusting the clamping degree between the clamping part and the variable shaft sleeve (41).

8. The cooling fan of the unmanned helicopter according to claim 1, characterized in that, The tension adjustment unit (4) also includes a flange (42), which is disposed at one end of the variable shaft sleeve (41); by rotating the flange (42), the variable shaft sleeve (41) can be rotated circumferentially.

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