Shaftless propeller

Abstract

The invention discloses a shaftless propeller. If the shaftless propeller is applied to a range hood or other aspects, the shaftless propeller is called a shaftless fan. An existing propeller and an existing fan rotate around a center shaft, due to the center shaft, resistance is increased, noise is correspondingly increased, and the propeller can generate a large number of bubbles in water and is also called cavitation bubbles. The invention aims to solve the problems. The principle is simple, the variable gear is driven by the common motor gear, then the variable gear is driven by the main gear suite shown in the figure 8, and the main gear suite can be directly driven by the motor gear without the variable gear. Higher revolutions can be obtained through the variable gears, and the shaftless propeller can obtain larger lift force only when the revolutions are higher. The main gear set is composed of a hollow main gear, an upper gear sleeve, a lower gear sleeve, a plurality of rolling shafts 51, shaftless fan blades connected with the rolling shafts 51 and the like. The device is simple in structure, convenient to manufacture and suitable for being used on aircrafts, smoke exhaust ventilators, underwater vehicles (with waterproof design) and the like.

Description

Technical Field

[0001] The invention relates to a propeller (fan), which is a propeller (fan) without a central shaft. Background Art

[0002] Existing propellers (fans) all rotate by the central axis to drive the blades to rotate. Due to the central axis, the resistance increases too much, the noise also increases accordingly, and the propeller rotating in the water will also produce a large amount of cavitation. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the object of the present invention is to provide a shaftless propeller with a simple structure and no central shaft.

[0004] In order to achieve the above-mentioned purpose, the shaftless propeller of the present invention has the characteristics of low noise and less cavitation.

[0005] The present invention is to connect a small gear on a speed-changing gear with a common motor. Since the small gear and the large gear are linked, the large gear also rotates when the small gear rotates. Since the number of teeth of the large and small gears is different, the speed change effect is achieved. The speed-changing gear then drives the main gear system. Alternatively, the speed-changing gear may be omitted and the main gear system may be directly driven by the motor gear. The main gear system includes a hollow main gear, a shaftless fan blade, two identical gear sleeves, a roller or a roller set, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a plan view of a motor gear without a motor connected. Figure 2 It is a plan view of the speed change gear.

[0007] Figure 3 Schematic diagram of the main gear.

[0008] Figure 4 Schematic diagram of the cross section of the main gear.

[0009] Figure 5 Schematic diagram of the inner surface of the main gear housing Figure 6 Schematic diagram of the cross section of the main gear housing.

[0010] Figure 7 Schematic diagram of the blade plane of a shaftless propeller Figure 8 Schematic diagram of the main gear system.

[0011] Fig. 9 It is a plan view of the related operation of the motor gear, speed gear and main gear system.

[0012] Fig.10A schematic diagram of the overall structure. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] like Fig. 9 As shown, 2 is the connection port for connecting the motor shaft. Connect the motor to the motor connection port 2. Drive the motor gear 21. The motor gear drives the small gear 52 on the speed gear, and the small gear is linked to the large gear 51. Since the speed gear 5 is coaxial, the speed of the large and small gears is consistent. Due to the different number of teeth, the speed change effect is achieved. After the speed change, the large gear 51 of the speed gear drives the main gear 32 in the main gear system. Since the main gear is connected to the shaftless fan blade, the shaftless fan blade rotates when the main gear rotates. The entire system is connected to the external frame. Fig.10 The present invention, i.e., a shaftless propeller, is formed by assembling the same.

[0015] In the above structure, when the motor is running, the motor gear drives the speed gear, and then the speed gear drives the main gear system, and the entire shaftless propeller of the present invention is in operation. According to needs, the number of teeth of the large and small gears of the speed gear is changed to achieve the effect of speed change, thereby achieving the required number of revolutions of the shaftless propeller. Since the greater the number of revolutions of the shaftless propeller, the greater the lift, a speed gear is needed to increase the number of revolutions of the shaftless propeller. According to actual needs, the speed gear can be omitted, and the shaftless gear can be directly driven by the motor gear. The present invention has a simple structure, is easy to manufacture, and has a low cost.

[0016] The present invention is not limited to the above-mentioned shaftless propeller, but can also be applied to shaftless fans such as range hoods and other similar structures, which should be considered to be within the protection scope of the present invention.

Claims

1. A shaftless propeller, comprising a speed change gear, a hollow gear, shaftless blades and upper and lower gear sleeves.

2. The shaftless propeller according to claim 1, characterized in that The propeller has no central shaft, and its hollow gear is in a hollow gear kit.

3. The shaftless propeller as described in claim 2, wherein the size of the hollow gear gradually increases from the outside to the inside, thus forming a certain angle, and matching the upper and lower hollow gear sleeves with opposite angles, and a roller is provided between the hollow gear and the gear sleeve to enable smooth rotation.

4. If the shaftless propeller as claimed in claim 3 is applied to a range hood, it is called a shaftless fan.

5. The shaftless propeller described in any one of claims 1 to 3 is characterized by low noise and very small cavitation generated when used underwater.

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