Beta control mechanism for propeller reversing function of propeller

Abstract

The invention relates to a beta control mechanism for a propeller reversing function of a propeller, which comprises a speed regulator shell, a beta valve and a propeller reversing electromagnetic valve, an oil way is formed in the speed regulator shell, the oil way comprises an engine oil incoming way, a high-pressure oil way, a propeller oil removing way, a P control oil way and a propeller reversing oil way, the engine oil incoming way is communicated with an engine lubricating oil cavity, and the high-pressure oil way is communicated with the propeller oil removing way. The propeller oil removing path is communicated with the propeller oil cavity; the valve beta is communicated with the reverse paddle oil way and can be communicated with the high-pressure oil way or the P control oil way through axial movement; and one end of the reverse propeller electromagnetic valve is communicated with the high-pressure oil way, and the other end is communicated with the reverse propeller oil way. When the speed regulator works normally, the high-pressure oil incoming direction of the reverse propeller electromagnetic valve is cut off, residual oil at the beta valve and an oil return path are communicated, it is ensured that the oil path does not hold oil, after the reverse propeller electromagnetic valve receives signal excitation, oil is supplied to a propeller cavity again through a parallel loop, and therefore the propeller is driven to continuously decrease the pitch till reverse propeller is achieved. The mechanism can relieve the small-distance movement limitation of the propeller, so that the propeller achieves the reverse propeller function.

Description

Technical Field

[0001] This application relates to the field of aviation propeller control system technology, and in particular to a β control mechanism for propeller anti-rotation function. Background Technology

[0002] Adding a propeller anti-rotation function during aircraft landing and taxiing can shorten runways and reduce land waste. Current propeller governors achieve anti-rotation mechanically, requiring the power lever to be pulled back, moving the β valve to supply fuel to the propeller chamber. Simultaneously, a counter-rotation lever moves the β valve again to close the fuel supply, and this repeated switching is necessary to achieve anti-rotation. However, to adapt to new developments, the integrated engine and propeller control system has been replaced with digital electronic control, eliminating the power lever hinged to the propeller governor β valve. Therefore, the propeller governor cannot achieve anti-rotation using the original structure. Thus, there is an urgent need to research a β control mechanism that can disable the propeller's small-pitch limiting and fixed-pitch protection function to achieve anti-rotation. Summary of the Invention

[0003] This application provides a β control mechanism for propeller anti-rotation function, which solves the problem in the prior art that when the integrated control of the engine and propeller is changed to digital electronic control and the structure of the power rod hinged to the propeller governor β valve is eliminated, the propeller governor cannot achieve anti-rotation in the original structure.

[0004] This application provides a β control mechanism for propeller reversing function, comprising:

[0005] The governor housing contains an oil passage for oil flow, which includes an engine oil inlet passage, a high-pressure oil passage, a propeller oil outlet passage, a P control oil passage, and a reverse propeller oil passage. The engine oil inlet passage is connected to the engine lubricating oil chamber, and the propeller oil outlet passage is connected to the propeller oil chamber.

[0006] The β valve is connected to the anti-spread oil circuit, and the β valve can be connected to the high-pressure oil circuit or the P-control oil circuit through axial movement.

[0007] The reverse propeller solenoid valve has one end connected to the high-pressure oil circuit and the other end connected to the reverse propeller oil circuit.

[0008] In one possible design, the mechanism also includes a gear pump, which is located inside the governor housing. One end of the gear pump is connected to the engine oil supply line, and the other end is connected to the high-pressure oil supply line.

[0009] In one possible design, the mechanism also includes a safety valve, the oil inlet of which is connected to the oil outlet of the gear pump, and the oil outlet of the safety valve is connected to the oil inlet of the gear pump. The safety valve is used to control the oil pressure within a preset range.

[0010] In one possible design, the mechanism also includes a valve core and cap assembly, which is used to connect or disconnect the P control oil circuit from the propeller oil discharge circuit.

[0011] In one possible design, the mechanism also includes a stop assembly that blocks the high-pressure oil circuit from the P-control oil circuit by moving the β valve axially.

[0012] In one possible design, the stop assembly includes:

[0013] The bracket is equipped with guide rails.

[0014] Low-pitch stop ring, slidingly fitted with guide rail;

[0015] Carbon block assembly, mounted on low-pitch stop ring;

[0016] The stop block is connected to the low-distance stop ring;

[0017] Screws are used to connect the stop block to the β valve.

[0018] In one possible design, the β valve is provided with a left boss, which can be driven by axial movement of the β valve to block or avoid the high-pressure oil circuit.

[0019] In one possible design, the β valve is provided with a right boss. The β valve can move axially to move the right boss to the side of the anti-spread oil passage closer to the P control oil passage or away from the P control oil passage.

[0020] In one possible design, the β gate also includes a reset assembly for moving the left and right bosses to their initial positions.

[0021] In one possible design, the reset component includes:

[0022] The cap is fitted onto one end of the β valve and slides with the β valve.

[0023] A return spring, located between the cap and the β valve, has a spring force that moves the β valve to its initial position.

[0024] The beneficial effects of this application are as follows:

[0025] This application discloses a β control mechanism for propeller anti-rotation function. The governor's β valve is pulled to the closed high-pressure oil inlet position when the propeller pitch decreases, thus ceasing oil supply to the propeller chamber and automatically maintaining the propeller at a certain blade angle. Since there is no mechanical structure to re-pull the β valve to reopen the oil circuit and resume oil supply, a new parallel oil circuit is established within the governor to achieve the purpose of releasing the pitch limitation and entering the anti-rotation state. A two-position, three-position normally closed anti-rotation solenoid valve is designed within the governor's internal structure to receive digital electronic control excitation. During normal governor operation, the anti-rotation solenoid valve cuts off the high-pressure oil supply direction, connecting the residual oil at the β valve with the return oil circuit, ensuring no oil blockage. When the anti-rotation solenoid valve receives a signal excitation, it resumes oil supply to the propeller chamber through the parallel circuit, thereby continuously decreasing the propeller pitch until anti-rotation occurs. This mechanism can release the propeller pitch limitation, enabling the propeller to achieve anti-rotation function. It has a simple structure, good flight safety, and allows the aircraft to shorten its taxiing distance, improving economy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a β control mechanism for propeller anti-rotation function provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a β valve of a β control mechanism for propeller anti-rotation function provided in an embodiment of this application.

[0029] Figure label:

[0030] 1. Governor housing; 2. Reverse propeller solenoid valve; 3. Propeller oil supply circuit; 4. Engine oil supply circuit; 5. Bracket; 6. Guide rail; 7. Low-distance stop ring; 8. Carbon block assembly; 9. Stop block; 10. Screw; 11. β valve; 12. Cap; 13. Spring; 14. Reverse propeller oil circuit; 15. P control oil circuit; 16. High-pressure oil circuit; 17. Left boss; 18. Right boss; 19. Safety valve; 20. Valve core and cap assembly; 21. Gear pump. Detailed Implementation

[0031] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The following is combined with Figures 1-2 This application describes a β control mechanism for propeller anti-rotation function provided in an embodiment of the present application.

[0033] Reference Figure 1 As shown in the embodiment of this application, a β control mechanism for propeller reversing function includes a governor housing 1, a β valve 11, and a reversing solenoid valve 2. The governor housing 1 contains an oil passage for oil flow, including an engine oil inlet passage 4, a high-pressure oil passage 16, a propeller oil outlet passage 3, a P-control oil passage 15, and a reversing oil passage 14. The engine oil inlet passage 4 is connected to the engine lubricating oil chamber, and the propeller oil outlet passage 3 is connected to the propeller oil chamber. The β valve 11 is connected to the reversing oil passage 14, and the β valve 11 can be axially moved to connect with either the high-pressure oil passage 16 or the P-control oil passage 15. One end of the reversing solenoid valve 2 is connected to the high-pressure oil passage 16, and the other end is connected to the reversing oil passage 14.

[0034] The mechanism also includes a gear pump 21, which is disposed inside the governor housing 1. One end of the gear pump 21 is connected to the engine oil supply line 4, and the other end is connected to the high-pressure oil line 16. The gear pump 21 is used to pressurize the lubricating oil in the engine oil supply line 4. After being pressurized by the gear pump 21, high-pressure lubricating oil of 3 + 0.20 MPa is generated in the high-pressure oil line 16.

[0035] The mechanism also includes a safety valve 19, the oil inlet of which is connected to the oil outlet of the gear pump 21, and the oil outlet of the safety valve 19 is connected to the oil inlet of the gear pump 21. The safety valve 19 is used to control the oil pressure within a preset range.

[0036] The mechanism also includes a valve core and valve cap assembly 20, which is used to connect or disconnect the P control oil passage 15 from the propeller oil passage 3.

[0037] The mechanism also includes a stop assembly that blocks the high-pressure oil circuit 16 from the P-control oil circuit 15 by moving the β valve 11 axially.

[0038] The stop assembly includes a bracket 5, a low-pitch stop ring 7, a carbon block assembly 8, a stop block 9, and a screw 10. A guide rail 6 is mounted on the bracket 5; the low-pitch stop ring 7 is slidably engaged with the guide rail 6; the carbon block assembly 8 is mounted on the low-pitch stop ring 7; the stop block 9 is connected to the low-pitch stop ring 7; and the screw 10 is used to connect the stop block 9 to the β valve 11.

[0039] The β valve 11 is provided with a left boss 17. The β valve 11 can move axially to block or avoid the high-pressure oil circuit 16. The β valve 11 is provided with a right boss 18. The β valve 11 can move axially to move the right boss 18 to the side of the anti-spread oil circuit 14 closer to the P control oil circuit 15 or away from the P control oil circuit 15.

[0040] During normal operation, the β valve moves in mechanical linkage with the propeller to reduce the pitch, and the left boss 17 blocks the high-pressure oil circuit 16 to achieve small-pitch stop. During reverse propulsion, the reverse propulsion oil circuit 14 is connected through the solenoid valve, and the high-pressure oil pushes the β valve to move, and the right boss 18 reconnects the P control oil circuit to achieve reverse propulsion.

[0041] The β-valve 11 also includes a reset assembly for moving the left boss 17 and the right boss 18 to their initial positions. The reset assembly includes a cap 12 and a reset spring 13. The cap 12 is sleeved on one end of the β-valve 11 and slides in cooperation with the β-valve 11. The reset spring 13 is disposed between the cap 12 and the β-valve 11 and has a spring force to move the β-valve 11 to its initial position.

[0042] The working principle of a β control mechanism for propeller anti-rotation function according to this application is as follows:

[0043] During normal operation, the governor uses oil pressurization, oil circuit guidance, and mechanical feedback linkage to achieve a smaller propeller pitch and stabilize it in a small pitch state. The core steps are as follows:

[0044] After the engine oil enters the governor housing 1 through the engine oil passage 4, it is pressurized by the gear pump 21, so that a stable high-pressure oil (pressure of 3±0.20MPa) is formed in the high-pressure oil passage 16.

[0045] At this time, β valve 11 is in the initial position, and the annular groove of β valve 11 is not blocked. High pressure oil can bypass the annular groove of β valve 11 and enter the P control oil circuit 15, and then flow into the propeller oil circuit through the channel of valve core and valve cap assembly 20 to provide adjustment power for the propeller.

[0046] After the high-pressure oil enters the propeller through the oil circuit, it pushes the blade angle to decrease (i.e., "smaller pitch"). A smaller blade angle can increase the speed or thrust to meet the needs of normal flight.

[0047] As the propeller pitch decreases, it causes the low-pitch stop ring 7 to move to the right (high-pressure oil from the governor enters the propeller chamber, and under the pressure of the oil, the propeller moves from feathering to a smaller pitch direction. The movement of the propeller piston will drive the piston boss, and when the blade angle decreases to a certain extent, the piston boss will press against the small-pitch stop nut on the pitch rod. As the propeller continues to decrease in pitch, the piston will drive the small-pitch stop nut and the pitch rod to move together in the smaller pitch direction, and the low-pitch stop ring 7 is connected to the pitch rod, so it will also move to the right). This, in turn, pushes the carbon block assembly 8 and the stop block 9 to slide to the right on the guide rail 6 fixed by the bracket 5.

[0048] When the low-distance stop ring 7 moves to the right, it will drive the β valve 11 to move to the right synchronously through the stop block 9 and the screw 10 until the left boss 17 of the β valve 11 completely blocks the oil outlet of the high-pressure oil circuit 16, cutting off the supply of high-pressure oil to the P control oil circuit 15.

[0049] When the high-pressure oil circuit 16 is blocked, the supply of high-pressure oil to the propeller stops, the propeller stops decreasing in pitch, the blade angle stabilizes, achieving "small pitch stop" and ensuring the propeller angle is stable during normal operation.

[0050] When reverse propeller rotation is required (such as during aircraft landing, where the reverse rotation of the propeller blades generates drag to shorten the landing distance):

[0051] After the pilot issues the anti-rotation command, the anti-rotation solenoid valve 2 is activated (energized and opened), connecting the high-pressure oil circuit 16 with the anti-rotation oil circuit 14. The high-pressure lubricating oil in the high-pressure oil circuit 16 forms a new pressure channel through the anti-rotation oil circuit 14.

[0052] The high-pressure oil in the anti-spread oil circuit 14 acts directly on the β valve 11, pushing the β valve 11 to move to the right (at this time, the moving power comes from the pressure of the anti-spread oil circuit 14, rather than the linkage of the low-distance stop ring 7 during normal operation).

[0053] During the rightward movement of β valve 11, the right boss 18 moves from the left side of the reverse propeller oil passage 14 (the side closer to P control oil passage 15) to the right side of the reverse propeller oil passage 14 (the side farther from P control oil passage 15), so that the reverse propeller oil passage 14 re-establishes a passage with P control oil passage 15 through the annular groove of β valve 11.

[0054] After the P control oil circuit and the reverse propeller oil circuit 14 are connected, the high-pressure oil enters the propeller through a new path, pushing the blade angle to adjust in the opposite direction (from normal small pitch to reverse propeller angle), so that the propeller generates reverse resistance and achieves the reverse propeller braking effect.

[0055] When the reverse propulsion requirement ends (such as when the aircraft stops taxiing or when there is no need to continue braking), the reverse propulsion solenoid valve 2 is closed directly. After the solenoid valve is closed, the passage between the high-pressure oil circuit 16 and the reverse propulsion oil circuit 14 is cut off, the pressure in the reverse propulsion oil circuit 14 disappears, and the β valve 11 returns to its initial position under the action of the return spring 13.

[0056] At this point, the propeller oil circuit is no longer driven by the high-pressure oil of the reverse propeller, and the blade angle is adjusted to the slow speed state (a stable angle with low speed and low resistance), completing the reverse propeller exit.

[0057] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A β control mechanism for propeller reversing function, characterized in that, include: The governor housing has an oil passage for oil flow, which includes an engine oil inlet passage, a high-pressure oil passage, a propeller oil outlet passage, a P control oil passage, and a reverse propeller oil passage. The engine oil inlet passage is connected to the engine lubricating oil chamber, and the propeller oil outlet passage is connected to the propeller oil chamber. β valve, the β valve is connected to the anti-spear oil circuit, and the β valve can be connected to the high-pressure oil circuit or the P control oil circuit by axial movement; A reverse propeller solenoid valve, one end of which is connected to the high-pressure oil circuit, and the other end of which is connected to the reverse propeller oil circuit.

2. The β control mechanism for propeller anti-rotation function according to claim 1, characterized in that: It also includes a gear pump, which is disposed inside the governor housing. One end of the gear pump is connected to the engine oil supply line, and the other end is connected to the high-pressure oil line.

3. The β control mechanism for propeller anti-rotation function according to claim 2, characterized in that: It also includes a safety valve, the oil inlet of which is connected to the oil outlet of the gear pump, and the oil outlet of the safety valve is connected to the oil inlet of the gear pump. The safety valve is used to control the oil pressure within a preset range.

4. A β control mechanism for propeller anti-rotation function according to claim 1, characterized in that: It also includes a valve core and valve cap assembly, which is used to connect or block the P-control oil circuit from the propeller oil discharge circuit.

5. A β control mechanism for propeller anti-rotation function according to claim 1, characterized in that: It also includes a stop assembly, which blocks the high-pressure oil circuit from the P-control oil circuit by pulling the β valve to move along its axial direction.

6. A β control mechanism for propeller reversing function according to claim 5, characterized in that, The stop assembly includes: A bracket, on which a guide rail is mounted; A low-distance stop ring is slidably fitted with the guide rail; The carbon block assembly is mounted on the low-pitch stop ring; The stop block is connected to the low-pitch stop ring; Screws are used to connect the stop block to the β valve.

7. A β control mechanism for propeller anti-rotation function according to any one of claims 1-6, characterized in that: The β valve is provided with a left protrusion. The β valve can move axially to drive the left protrusion to block or avoid the high-pressure oil circuit.

8. A β control mechanism for propeller anti-rotation function according to claim 7, characterized in that: The β valve is provided with a right protrusion. The β valve can move the right protrusion to the side of the anti-spread oil passage that is close to the P control oil passage or away from the P control oil passage by axial movement.

9. A β control mechanism for propeller anti-rotation function according to claim 8, characterized in that: The β-gate also includes a reset assembly, which is used to move the left boss and the right boss to their initial positions.

10. A β control mechanism for propeller anti-rotation function according to claim 9, characterized in that, The reset component includes: A cap is fitted onto one end of the β valve and slides in conjunction with the β valve. A return spring is disposed between the cap and the β valve, and has an elastic force that moves the β valve to its initial position.

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