Dynamic balance weight paddle, rotor system and aircraft
By setting up liquid tubes and counterweight components in the rotor blades, combined with on-board computer control and sensor data, automatic unlimited adjustment of rotor dynamic balance is achieved, which solves the problem of rotor dynamic balance dependence on technical experience and improves the accuracy and adaptability of adjustment.
Patent Information
- Application Number
- CN202422557568.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In the prior art, rotor dynamic balance adjustment requires high experience on technicians and is limited by many, especially in complex flight conditions.
The dynamic balance weight blade is adopted, and the design of liquid tubes and counterweight components in the blades is designed, and the liquid pump and the on-board computer control system are used to achieve poleless adjustment. The acceleration sensor and phase sensor provide data basis, and the dynamic balance of the rotor is automatically adjusted.
It realizes the dynamic balance of the rotor infinity adjustment, simple operation, low requirements for technicians, wide adaptability range, high adjustment accuracy, and adaptability to various flight states.
Smart Images
Figure CN223148687U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flight equipment, in particular to a dynamic balance counterweight blade, a rotor system and an aircraft. Background Art
[0002] With the continuous development of helicopter technology, the importance of rotor dynamic balance has become increasingly prominent. As a unique aircraft, the flight performance and safety of a helicopter largely depend on the design and maintenance of the rotor system. As the main lift and control component of a helicopter, the dynamic balance state of the rotor directly affects the flight quality and ride comfort of the helicopter.
[0003] Traditionally, the dynamic balance is adjusted manually using counterweight blocks. By replacing and cutting the counterweight blocks to change the blade, the helicopter usually needs to be started one or more times or even flown for a short distance during the adjustment process. Moreover, the dynamic balance adjustment is closely related to the experience of the operator. If the operator has insufficient experience, the number of starts and flights will increase significantly, resulting in increased costs. At the same time, the existing rotor dynamic balance adjustment is usually restricted by the site and the aircraft (such as an unmanned aerial vehicle), and can only adjust a few simple flight states, such as hovering and flying forward at a low speed. When the aircraft is in other working conditions, such as flying forward at a high speed or flying at high altitude, the dynamic balance problems caused by the change of the blade state cannot be adjusted by traditional methods, and the adjustment of the dynamic balance is restricted more. Summary of the Utility Model
[0004] In view of the above analysis, the utility model aims to provide a dynamic balance counterweight blade, a rotor system and an aircraft, so as to solve the problems that the existing rotor dynamic balance adjustment has high requirements for the experience of technicians and is restricted more.
[0005] The utility model provides a dynamic balance counterweight blade, which comprises a liquid pipe, a blade and a counterweight assembly arranged in the blade;
[0006] The counterweight assembly is used for adjusting the dynamic balance counterweight of the blade, and the counterweight assembly comprises a housing and a piston, and the piston is arranged in the housing;
[0007] The housing comprises a counterweight cavity and an adjustment cavity;
[0008] One side of the piston is the counterweight cavity connected to the liquid pipe, and the other side is the adjustment cavity.
[0009] Further, the counterweight assembly further comprises an exhaust pipe, and the adjustment cavity is communicated with the inside of the blade through the exhaust pipe.
[0010] Further, a spring is arranged in the adjustment cavity, and the spring is connected to the piston.
[0011] Further, the counterweight assembly is disposed at the tip position of the blade.
[0012] Further, there are at least two groups of the counterweight assemblies and they are arranged along the chord direction of the blade.
[0013] Further, the shape formed by the connection of the liquid pipe and the counterweight assembly is "U" shaped.
[0014] The present utility model also provides a rotor system, including the above dynamic balance counterweight blade and a hub.
[0015] Further, it further includes a liquid pump and a liquid tank. The liquid pump connected to the liquid pipe is disposed on the hub, and the liquid pipe enters the liquid tank through the liquid pump.
[0016] Further, the liquid in the liquid pump and the liquid tank is water or fuel;
[0017] When the liquid in the liquid pump and the liquid tank is fuel, the liquid tank is the fuel tank of the aircraft.
[0018] The present utility model also provides an aircraft, including the above rotor system.
[0019] The technical solution of the present utility model can at least achieve one of the following effects:
[0020] (1) For the dynamic balance counterweight blade of the present utility model, the dynamic balance counterweight of the blade is adjusted by the change of the liquid weight in the counterweight cavity. The operation is simple. The dynamic balance adjustment can be achieved by controlling the liquid pump through the on-board computer control system. The adjusted weight is controllable, not limited by the weight of the counterweight block, and stepless adjustment can be realized. The operation is simple, the requirements for technicians are low, and the application range is wide.
[0021] (2) For the dynamic balance counterweight blade of the present utility model, by symmetrically arranging multiple groups of counterweight assemblies along the chord direction of the blade, the center of gravity in the chord direction of the blade can be adjusted. By adjusting the weights of different counterweight assemblies on the same blade, a weight difference exists between different counterweight assemblies, thereby changing the center of gravity in the chord direction of the blade and realizing the adjustment of the dynamic balance counterweight in the chord direction and the long side direction of the blade.
[0022] (3) For the dynamic balance counterweight blade of the present utility model, a spring is arranged in the adjustment cavity to provide support for the piston by the spring, preventing the piston from displacing when no liquid is injected into the counterweight cavity, and avoiding the occurrence of air bubbles in the counterweight cavity caused by the movement of the piston, which affects the liquid pumping effect of the liquid pump.
[0023] (4) The dynamic balance counterweight blade of the present utility model makes the air pressure in the adjustment cavity consistent with the air pressure inside the blade by setting an exhaust pipe, preventing the change of the pressure in the adjustment cavity with the movement of the piston from affecting the movement of the piston, and preventing the gas pressure in the adjustment cavity from entering the counterweight cavity.
[0024] (5) The rotor system of the present utility model can detect the horizontal vibration condition of the blade through an acceleration sensor and obtain the rotation phase of the rotor through a phase sensor, thereby providing a data basis for the adjustment of the counterweight assembly according to the horizontal vibration condition of the blade and the rotation phase of the rotor, and increasing the accuracy of the adjustment.
[0025] (6) The aircraft of the present utility model adopts the above rotor system, so that it can be calculated through the on-board computer control unit to obtain the phase of mass imbalance, and control the liquid pump to inject or extract liquid into the counterweight cavity that needs to adjust the counterweight. The operation is simple, the application range is relatively wide, and it is convenient to adjust the dynamic balance counterweight of the blade.
[0026] In the present utility model, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present utility model will be described in the subsequent specification, and some advantages can be made obvious from the specification, or understood by implementing the present utility model. The purpose and other advantages of the present utility model can be realized and obtained through the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The drawings are only for the purpose of showing specific embodiments, and are not considered as a limitation to the present utility model. Throughout the drawings, the same reference signs represent the same components.
[0028] Figure 1 It is a partial structural schematic diagram of the dynamic balance counterweight blade of Embodiment 1 of the present utility model with the blade skin hidden and the counterweight assembly exposed;
[0029] Figure 2 It is a structural schematic diagram of the counterweight assembly of Embodiment 1 of the present utility model;
[0030] Figure 3 It is an overall structural schematic diagram of the rotor system of Embodiment 2 of the present utility model;
[0031] Figure 4 It is a partial structural schematic diagram of the dynamic balance counterweight blade and the hub of Embodiment 2 of the present utility model;
[0032] Figure 5 It is an overall structural schematic diagram of the aircraft of Embodiment 3 of the present utility model.
[0033] Reference Signs:
[0034] 1 - Liquid pipe; 2 - Counterweight assembly; 21 - Housing; 211 - Counterweight cavity; 212 - Adjustment cavity; 22 - Piston; 23 - Spring; 3 - Exhaust pipe; 4 - Blade; 5 - Hub; 6 - Reduction box. Detailed implementation manner
[0035] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of the present invention and are used together with the embodiments of the present invention to explain the principles of the present invention, and are not used to limit the scope of the present invention.
[0036] Embodiment 1
[0037] A specific embodiment of the present invention discloses a dynamic balance counterweight blade, as Figure 1 shown, including a liquid pipe 1, a blade 4, and a counterweight assembly 2 disposed in the blade 4; the counterweight assembly 2 is used to adjust the dynamic balance counterweight of the blade 4, and the counterweight assembly 2 includes a housing 21 and a piston 22, and the piston 22 is disposed in the housing 21; the housing 21 includes a counterweight cavity 211 and an adjustment cavity 212; one side of the piston 22 is the counterweight cavity 211 connected to the liquid pipe 1, and the other side is the adjustment cavity 212.
[0038] Preferably, the shape formed after the liquid pipe 1 is connected to the counterweight assembly 2 is "U" - shaped, so as to be able to extend the pipeline length and increase the range of dynamic balance adjustment; in addition, the "U" - shaped pipeline formed after the liquid pipe 1 is connected to the counterweight assembly 2 provides a relatively gentle transition area for the liquid, thereby increasing the stability of liquid flow and reducing the generation of bubbles.
[0039] The liquid pipe 1 is connected to a liquid tank through a liquid pump. Through the liquid pump, the liquid in the liquid tank can be injected into the counterweight cavity 211 to increase the weight of the counterweight assembly 2; the liquid pump can also extract the liquid in the counterweight cavity 211, flow it into the liquid tank through the liquid pipe 1, and reduce the weight of the counterweight assembly 2, thereby adjusting the dynamic balance counterweight of the blade 4.
[0040] Further, according to the lever principle, the counterweight assembly 2 is disposed at the tip position of the blade 4, so as to improve the adjustment effect of the counterweight assembly 2 on the dynamic balance counterweight of the blade 4.
[0041] Further, there are at least two groups of counterweight assemblies 2 and they are arranged along the chord direction (short - side direction) of the blade 4. By adjusting the weights of different counterweight assemblies 2 on the same blade 4, the center of gravity in the chord direction of the blade 4 can be adjusted.
[0042] Further, as Figure 2As shown, a spring 23 is disposed in the adjustment chamber 212, and the spring 23 is connected to the piston 22. The spring 23 provides a supporting force for the piston 22. When the dynamic balance counterweight blade rotates, the elastic force of the spring 23 on the piston 22 is greater than the centripetal force of the piston 22, thereby preventing the piston 22 from displacing when no liquid is injected into the counterweight chamber 211 and sucking the gas in the liquid pipe 1 into the counterweight chamber 211, resulting in bubbles in the counterweight chamber 211 when injecting liquid and affecting the liquid pumping effect of the liquid pump.
[0043] Preferably, when no liquid is injected into the counterweight chamber 211, the piston 22 is located on the side where the counterweight chamber 211 is connected to the liquid pipe 1. When injecting liquid into the counterweight chamber 211, the liquid pushes the piston 22 to move against the elastic force of the spring 23, so that the liquid entering the counterweight chamber 211 remains full in the counterweight chamber 211, avoiding the liquid in the counterweight chamber 211 from shaking and deforming as the dynamic balance counterweight blade rotates, causing the center of gravity of the liquid in the counterweight chamber 211 to change and affecting the dynamic balance counterweight effect.
[0044] Further, as Figure 2 shown, the adjustment chamber 212 is internally connected to the inside of the blade 4 through the exhaust pipe 3, so that the air pressure in the adjustment chamber 212 is the same as the air pressure in the blade 4, preventing the pressure in the adjustment chamber 212 from changing with the movement of the piston 22 and affecting the movement of the piston 22, and preventing the gas pressure in the adjustment chamber 212 from entering the counterweight chamber 211.
[0045] Preferably, both the counterweight assembly 2 and the exhaust pipe 3 are made of non-deformable materials.
[0046] Preferably, the liquid pipe 1 is made of a soft and pressure-resistant material, enabling the liquid pipe 1 to adapt to the deformation of the blade, improving the service life of the device, and preventing the pressure of the blade 4 from damaging the liquid pipe 1.
[0047] When it is necessary to adjust the dynamic balance counterweight of the blade, the weight of the liquid in the counterweight chamber 211 is adjusted by the liquid pump, and the dynamic balance counterweight of the blade is adjusted by using the weight of the liquid in the counterweight chamber 211. When it is necessary to increase the weight of the counterweight assembly 2, liquid is injected into the counterweight chamber 211 from the liquid tank by the liquid pump, so that the liquid in the counterweight chamber 211 pushes the piston 22 to move towards the adjustment chamber 212, increasing the volume of the counterweight chamber 211 as the piston 22 moves, thereby being able to accommodate more liquid and increasing the weight of the counterweight chamber 211; when it is necessary to reduce the weight of the counterweight assembly 2, the liquid in the counterweight chamber 211 is pumped back into the liquid tank by the liquid pump, and the piston 22 moves towards the side of the counterweight chamber 211 close to the liquid pipe 1 under the action of the spring 23, and the volume of the counterweight chamber 211 gradually decreases as the liquid in the counterweight chamber 211 decreases.
[0048] Exemplarily, the liquid is water, and the liquid tank is a water tank. Using water as the counterweight liquid can save costs and keep the pipeline clean.
[0049] Preferably, the liquid is fuel. At this time, the fuel tank of the aircraft can be used as the liquid tank, eliminating the need for an additional liquid tank. The aircraft also does not need to carry additional liquid for the dynamic balance counterweight blades, reducing the additional load of the aircraft and lowering its power consumption.
[0050] Embodiment 2
[0051] Another specific embodiment of the present invention discloses a rotor system, as Figures 3 to 4 shown, including the dynamic balance counterweight blade of Embodiment 1 and the hub 5. The dynamic balance counterweight blade is connected to the hub 5, and the liquid pump is arranged on the hub 5. The liquid pipe 1 enters the liquid tank through the liquid pump.
[0052] As Figure 3 shown, the rotor system further includes a reduction box 6. A phase sensor and an acceleration sensor are arranged on the reduction box 6. The horizontal vibration condition of the blade can be detected through the acceleration sensor, and the rotation phase of the rotor can be obtained through the phase sensor, thereby providing a data basis for the adjustment of the counterweight assembly 2 according to the horizontal vibration condition of the blade and the rotation phase of the rotor, increasing the accuracy of the adjustment.
[0053] Exemplarily, the phase sensor is a Hall sensor, and the acceleration sensor is a triaxial acceleration sensor.
[0054] The phase sensor and the acceleration sensor are connected to the on-board computer control unit, thereby transmitting the relevant data of the horizontal vibration condition of the blade and the rotation phase of the rotor to the on-board computer control unit. Through the on-board computer control unit, the phase of mass imbalance can be calculated, and the liquid pump can be controlled to inject or extract liquid into or from the counterweight cavity 211 that needs to adjust the counterweight. Calculating the phase of mass imbalance through the on-board computer control unit and controlling the liquid pump to inject or extract liquid into or from the counterweight cavity 211 is a prior art and will not be elaborated here.
[0055] Embodiment 3
[0056] Another specific embodiment of the present invention discloses an aircraft, as Figure 5 shown, including the rotor system of Embodiment 2.
[0057] Compared with the prior art, for the dynamic balance counterweight blade of the present utility model, the dynamic balance counterweight of the blade is adjusted by the change in the weight of the liquid in the counterweight cavity 211. The operation is simple. By controlling the liquid pump through the on-board computer control system, dynamic balance adjustment can be achieved. The adjusted weight is controllable, not limited by the weight of the counterweight block, and stepless adjustment can be realized. The operation is simple, with relatively low requirements for technicians and a wide application range. By symmetrically arranging multiple groups of counterweight components 2 along the chord direction of the blade 4, the centroid in the chord direction of the blade 4 can be adjusted. By adjusting the weights of different counterweight components 2 on the same blade 4, a weight difference exists between different counterweight components 2, thereby changing the centroid in the chord direction of the blade 4 and realizing the adjustment of the dynamic balance counterweight in the chord direction and the long side direction of the blade. A spring 23 is arranged in the adjustment cavity 212 to provide support for the piston 22, preventing the piston 22 from displacing when no liquid is injected into the counterweight cavity 211 and avoiding the generation of air bubbles in the counterweight cavity 211 due to the movement of the piston 22, which affects the liquid pumping effect of the liquid pump. By providing an exhaust pipe 3, the air pressure in the adjustment cavity 212 is made consistent with the air pressure in the blade 4, preventing the change in the pressure in the adjustment cavity 212 with the movement of the piston 22 from affecting the movement of the piston 22 and preventing the gas pressure in the adjustment cavity 212 from entering the counterweight cavity 211.
[0058] For the rotor system of the present utility model, the horizontal vibration condition of the blade can be detected through an acceleration sensor, and the rotation phase of the rotor can be obtained through a phase sensor, thereby providing a data basis for the adjustment of the counterweight component 2 according to the horizontal vibration condition of the blade and the rotation phase of the rotor, and increasing the accuracy of the adjustment.
[0059] For the aircraft of the present utility model, by adopting the above rotor system, it is thus possible to calculate the phase of mass imbalance through the on-board computer control unit and control the liquid pump to inject or extract liquid into the counterweight cavity 211 that needs to adjust the counterweight. The operation is simple, with a wide application range, and it is convenient to adjust the dynamic balance counterweight of the blade.
[0060] As mentioned above, it is only the preferred specific 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 by the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A dynamic balance counterweight blade, characterized in that, It includes a liquid pipe (1), a blade (4), and a counterweight assembly (2) disposed within the blade (4); The counterweight assembly (2) is used to adjust the dynamic balance of the blade (4). The counterweight assembly (2) includes a housing (21) and a piston (22), and the piston (22) is disposed within the housing (21); The housing (21) includes a counterweight chamber (211) and an adjustment chamber (212); One side of the piston (22) is the counterweight chamber (211) connected to the liquid pipe (1), and the other side is the adjustment chamber (212).
2. The dynamic balance counterweight blade according to claim 1, wherein, The counterweight assembly (2) further includes an exhaust pipe (3), and the adjustment chamber (212) is in internal communication with the inside of the blade (4) through the exhaust pipe (3).
3. The dynamic balance counterweight blade according to claim 1, characterized in that A spring (23) is disposed within the adjustment chamber (212), and the spring (23) is connected to the piston (22).
4. The dynamic balance counterweight blade according to claim 1, characterized in that, The counterweight assembly (2) is disposed at the tip position of the blade (4).
5. The dynamic balance counterweight blade according to claim 1, wherein, There are at least two groups of the counterweight assemblies (2) and they are arranged along the chord direction of the blade (4).
6. The dynamic balance counterweight blade according to claim 1, wherein The shape formed by the connection of the liquid pipe (1) and the counterweight assembly (2) is "U" shaped.
7. A rotor system, characterized in that, It includes the dynamic balance counterweight blade according to any one of claims 1-6 and a hub (5).
8. The rotor system according to claim 7, wherein It further includes a liquid pump and a liquid tank. A liquid pump connected to the liquid pipe (1) is disposed on the hub (5), and the liquid pipe (1) enters the liquid tank through the liquid pump.
9. The rotor system according to claim 8, characterized in that, The liquid in the liquid pump and the liquid tank is water or fuel; When the liquid in the liquid pump and the liquid tank is fuel, the liquid tank is the fuel tank of the aircraft.
10. An aircraft, characterized in that, It includes the rotor system according to any one of claims 7-9.