Reversing fan and fan blade reversing driving assembly

Abstract

The utility model discloses a reversing fan and a fan blade reversing driving assembly. The problem that the reverse air volume is small due to the fact that the rotation angle of fan blades is small in the current market is solved. A shaft hole is formed in a shell structure of the reversing fan, a fan blade shaft is installed in the shaft hole through a bearing and a sealing piece, fan blades are installed at the outer end of the fan blade shaft, a piston is arranged in the shell structure, an air inlet assembly or an oil inlet assembly is installed at a front shell, and an air injection space or an oil injection space is formed between the inner wall of the front shell and the piston. A spring is installed between the rear shell and the piston, and the fan is characterized in that a rack is fixedly installed on the piston, the rack is meshed with a tooth part at the end of the fan blade shaft, and the piston drives the fan blade shaft to rotate through the rack when moving. According to the technical scheme, the fan blades can rotate by 180 degrees, through the design of the forward and reverse 45 degrees, the angle of the forward air suction fan blades can be the same as the angle of the reverse air blowing fan blades, and the forward air suction amount is the same as the reverse air blowing amount.

Description

Technical Field

[0001] The utility model relates to the technical field of blade angle adjustment of a reversing fan. Background Art

[0002] A reversing fan allows the angle of the fan blades to be adjusted without reversing the fan shaft. This allows the fan to adjust wind speed and even reverse wind direction, creating reverse airflow. Adjusting wind speed is based on heat dissipation efficiency, while reverse airflow is based on automatic radiator cleaning. This system is widely used in agricultural and logging machinery.

[0003] Existing reversing fans use an eccentric rocker arm structure. For example, 201610806521.5 discloses a reversing fan. The angle of the blade can be adjusted by driving the steel pin on the fan shaft. Due to the limitations of the eccentric rocker arm structure, the reversing fan with this structure has a relatively small adjustment range of the blade angle, resulting in a relatively small reverse air volume. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the utility model provides a reversing fan and a fan blade reversing drive assembly, and provides a fan blade reversing drive assembly with a new structure to solve the problem of small reverse air volume caused by the small fan blade rotation angle in the current market.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A reversing fan, in which the front shell and the rear shell are assembled to form a shell structure, and an axial hole is provided in the shell structure, a fan shaft is installed in the axial hole through a bearing and a seal, and a fan blade is installed at the outer end of the fan shaft, a piston is provided inside the shell structure, and an air intake assembly or an oil intake assembly is installed at the front shell, and an air injection space or an oil injection space is formed between the inner wall of the front shell and the piston, and a spring is installed between the rear shell and the piston. It is characterized in that a rack is fixedly installed on the piston, the rack is engaged with the teeth at the end of the fan shaft, and the fan shaft is driven to rotate through the rack when the piston moves.

[0007] Furthermore, a sealing ring may be provided between the piston and the front housing.

[0008] Furthermore, the front and rear shells are directly fastened with bolts.

[0009] Furthermore, the driving medium for driving the piston is compressed air or hydraulic oil.

[0010] Furthermore, an annular groove for engaging the rack is provided on the piston, and the engaging point on the vertical arm of the rack is engaged in the annular groove.

[0011] Furthermore, a point-shaped groove for engaging with the rack is provided on the piston, and the engaging point on the vertical arm of the rack is engaged with the point-shaped groove.

[0012] The fan blade reversing drive assembly includes a fan blade shaft, a rack and a piston, wherein a rack is clamped and fixed on the piston, the rack engages with the teeth at the end of the fan blade shaft, and when the piston moves, the fan blade shaft is driven to rotate through the rack.

[0013] The piston is provided with an annular groove for engaging with the rack, and the engaging point on the vertical arm of the rack is engaged with the annular groove.

[0014] The piston is provided with a point-shaped clamping groove for clamping the rack, and the clamping point on the vertical arm of the rack is clamped in the point-shaped clamping groove.

[0015] The tooth portion is a 360-degree complete gear structure or an incomplete gear structure less than 360 degrees.

[0016] The beneficial effects of the utility model are:

[0017] In this technical solution, multiple racks are mounted axially and evenly spaced along the piston. The racks' movement direction aligns with the piston's. The piston drives the racks' linear motion, which in turn rotates the meshing blade shaft, enabling the blades to be adjusted through 180°. During this adjustment process, the meshing of the racks and gears ensures the blades remain firmly planted at the adjusted angle, which is crucial for achieving rapid switching and precise adjustment.

[0018] This technical solution can realize the fan blade rotation of 180°. Through the design of 45° positive and negative angles, the angle of the forward suction fan blade can be made the same as the angle of the reverse blowing fan blade, and the forward suction air volume is consistent with the reverse blowing air volume.

[0019] Through the implementation of this technology, the reverse air volume of the fan blades is increased, solving the pain point of small reverse air volume in the current market. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of a reversing fan.

[0021] Figure 2 This is a diagram of the arrangement of multiple blade shafts in a reversing fan.

[0022] Figure 3 This is the partial three-dimensional structure of the reversing fan after the rear shell is removed.

[0023] Figure 4 This is a three-dimensional view of the fan blade reversing drive assembly.

[0024] Figure 5 This is a three-dimensional view of the fan blade reversing drive assembly.

[0025] Figure 6 This is a diagram of the meshing structure of the fan shaft and the rack.

[0026] Figure 7 This is a diagram of the meshing structure of the fan shaft and the rack.

[0027] Figure 8 The fan shaft has partial teeth.

[0028] In the picture:

[0029] 10 front housing, 11 screws, 12 shaft holes, 121 bearings and seals,

[0030] 20 rear shell, 21 constraint portion,

[0031] 30 fan blade shaft, 31 bearing mounting section, 32 tooth portion, 33 fan blade mounting portion,

[0032] 40 rack, 41 clamping point, 42 arc portion,

[0033] 50 piston, 51 annular groove, 52 spring mounting hole,

[0034] 60 springs,

[0035] 70 air intake assembly or oil intake assembly,

[0036] 80 fan blades. DETAILED DESCRIPTION

[0037] A reversing fan is a special fan that needs to be configured in motor vehicles, especially diesel engine motor vehicles. It is required to be able to adjust the angle and reversing of the fan blades. The variable pitch fan can be quickly adjusted to control the direction (variable one, reversing) and air volume (variable two, adjustable angle) of the wind generated by the fan.

[0038] The backflush reversing function is to backflush the radiator to reduce or eliminate overheating caused by radiator blockage. The air volume control function is to provide airflow according to the radiator's temperature curve, thereby achieving heat dissipation control.

[0039] The above are application scenarios of existing reversing fans, which are well known.

[0040] refer to Figures 1 to 7In this embodiment, the front shell 10 and the rear shell 20 in the fan are enclosed and combined to form a combined shell structure, and the three are fastened together using hexagonal cylindrical head screws 11 to form an integral body, the interior of which is a mounting cavity. Furthermore, a mounting shaft hole 12 for the fan shaft is formed between the front shell and the rear shell after assembly, and the above-mentioned fan shaft 30 is rotatably mounted at the mounting shaft hole 12. Furthermore, a bearing mounting groove and a seal mounting groove are provided at the shaft hole, so that the fan shaft can be rotated after installation and has a certain dust-proof effect.

[0041] The middle section of the blade shaft 30 is the bearing mounting section 31, and the inner side of the bearing mounting section is the tooth portion 32. The tooth portion in this embodiment is a 360-degree full tooth arrangement, and can also be a partial tooth arrangement. Figure 8 , forming the so-called tooth portion. The outer end of the blade shaft is the blade mounting portion 33, and the installation between the blade shaft and the blade is ensured to be secure. In this embodiment, the steel pins or bolts used after plug-fitting are fixed.

[0042] The rack 40 meshing with the above-mentioned teeth is a short structure with teeth, and a protruding clamping point 41 is provided on one side of the rack. The clamping point is preferably located in the middle of the rack, and can also be located at the upper or lower position.

[0043] The piston 50 is provided with an annular groove 51 for engaging the rack and a spring mounting hole 52, and the card point on the vertical arm of the rack is engaged with the annular groove. In the implementation process of this structure, a restraining portion 21 for guiding the above-mentioned rack 40 needs to be provided in the rear shell or / and the front shell, for example Figure 2 As shown, the constraint portion 21 is an arcuate groove, which is slidably matched with the arcuate portion 42 on the rack so that the rack is clamped between the blade shaft tooth portion and the constraint portion 21 of the housing, so that the rack only has the ability to slide in the direction of the length piston axis.

[0044] As a structural variation, the piston is provided with a dot-shaped groove for engaging the rack, and the latching point on the vertical arm of the rack is latched into the dot-shaped groove. The dot-shaped groove and the latching point of this structure preferably fit together like a circular column and a circular groove. That is, a circular groove is provided on the piston and a circular column is provided on the rack.

[0045] Furthermore, the tooth portion at the end of the blade shaft is a 360-degree complete gear structure or an incomplete gear structure less than 360 degrees. It can be formed by integral forging or casting, or by mechanically mounting the gear on the end of the blade shaft, all within the scope of protection of this technology.

[0046] As for other structures of the fan shaft, they belong to the relatively mature existing technology in this field and will not be described in detail.

[0047] Generally speaking, the front shell and the rear shell are preferably made of aluminum castings, which are formed by pressure casting and then machined to meet the mechanical assembly requirements.

[0048] A sealing ring is provided between the piston and the front housing to form an oil chamber (or an air chamber), and an air inlet assembly or an oil inlet assembly is externally connected to an oil pressure system or an air pressure system.

[0049] The front shell and the rear shell in the fan are assembled to form a shell structure, and an axial hole 12 is provided in the shell structure. A fan shaft is installed in the axial hole through a bearing and a seal 121, and a fan blade is installed at the outer end of the fan shaft. A piston is provided inside the shell structure, and an air intake assembly or an oil intake assembly 70 is installed at the front shell, and an air injection space or an oil injection space is formed between the inner wall of the front shell and the piston, and a spring 60 is installed between the rear shell and the piston.

[0050] There are multiple springs, which are evenly arranged so that the back side of the piston is evenly stressed.

[0051] Furthermore, the styles of the front shell 10, rear shell 20, and fan blades 80 are based on the appearance design of the fan, and are not limited to the style of the rear shell, and should all fall within the scope of this technology.

[0052] As an option, an O-ring is provided at the joint surface between the front shell and the rear shell. The O-ring seals the mating surface to keep the internal space clean.

[0053] The fluid medium in this technology can be a hydraulic medium or a pneumatic medium.

[0054] The implementation of this technology simplifies and optimizes the structure of the reversing fan, that is, by reducing the use of components, the overall mechanical reliability is improved.

[0055] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A reversing fan, wherein the front shell and the rear shell of the fan are assembled to form a shell structure, and an axial hole is provided in the shell structure, a fan shaft is installed in the axial hole, and a fan blade is installed at the outer end of the fan shaft. A piston is provided inside the shell structure, and an air intake assembly or an oil intake assembly is installed at the front shell, and an air injection space or an oil injection space is formed between the inner wall of the front shell and the piston. A spring is installed between the rear shell and the piston, characterized in that: A rack is mounted on the piston, the rack meshes with the teeth at the end of the blade shaft, and when the piston moves, the blade shaft is driven to rotate via the rack.

2. The reversing fan according to claim 1, characterized in that: A sealing ring is provided between the piston and the front shell.

3. The reversing fan according to claim 1, characterized in that: The front shell and the rear shell are fastened with bolts.

4. The reversing fan according to claim 1, characterized in that: The driving medium for driving the piston is compressed air or hydraulic oil.

5. The reversing fan according to claim 1, characterized in that: The piston is provided with an annular groove for engaging the rack, and the engaging point of the rack is engaged in the annular groove.

6. The reversing fan according to claim 1, characterized in that: The piston is provided with a point-shaped clamping groove for clamping the rack, and the clamping point of the rack is clamped in the point-shaped clamping groove.

7. The fan blade reversing drive assembly includes a fan blade shaft, a rack and a piston, wherein: A rack is mounted on the piston, the rack meshes with the teeth on the end of the fan shaft, and when the piston moves, the fan shaft is driven to rotate via the rack.

8. The fan blade reversing drive assembly according to claim 7, characterized in that: The piston is provided with an annular groove for engaging the rack, and the rack engaging point is engaged in the annular groove.

9. The fan blade reversing drive assembly according to claim 7, characterized in that: The piston is provided with a point-shaped clamping groove for clamping the rack, and the clamping point of the rack is clamped in the point-shaped clamping groove.

10. The fan blade reversing drive assembly according to claim 7, characterized in that: The tooth portion is a 360-degree complete gear structure or an incomplete gear structure less than 360 degrees.

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