A propeller speed regulator

Abstract

The application discloses a propeller speed regulator, which comprises upper and lower shell assemblies, a bottom plate, an oil filter assembly, a speed selection mechanism, a power turbine adjusting assembly, a gear pump, a pressure regulating and beta valve assembly and a reset handle assembly; the oil from an engine is connected to a low-pressure oil groove on the bottom plate through the oil filter assembly, the outlet of the gear pump is divided into two paths, which are respectively connected to a high-pressure oil inlet of the beta valve assembly and a high-pressure oil cavity of a safety valve assembly; a low-pressure oil cavity of the safety valve assembly is connected to the low-pressure oil groove; a high-pressure oil outlet of the beta valve assembly is connected to a high-pressure oil inlet of the speed selection mechanism, a high-pressure oil outlet of the speed selection mechanism is connected to a propeller oil cavity; an oil return cavity of the beta valve assembly is connected to an oil groove II of the speed selection mechanism; and an oil return port of the speed selection mechanism is connected to an oil return groove of the engine. The propeller speed regulator has the advantages of speed selection, propeller control, reverse propeller realization, balance speed adjustment and control, high propeller working efficiency, large amount of fuel saving and high working safety and reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to a propeller speed regulator. BACKGROUND

[0002] The higher the rotational speed of the propeller, the greater the thrust generated, and the greater the thrust required for takeoff, and the smaller the thrust required for cruising flight. The existing propeller speed regulator is balanced by the centrifugal force of the counterweight and the spring force to maintain the constant balance speed of the propeller, and only has one balance speed, which is the same for takeoff and cruising flight, and cannot be selected, which leads to the fact that if the balance speed is set higher, the takeoff task can be completed more smoothly and efficiently, and the engine is less likely to be damaged, but a large amount of fuel is wasted during cruising flight, and the fuel consumption during flight is very high. If the balance speed is set lower, fuel is saved during cruising flight, but the plane needs to burn a large amount of fuel to generate more power to complete the takeoff task, so not only is fuel wasted, but the engine is also easily damaged. Therefore, a suitable balance speed should be selected according to the actual situation of the plane, but no matter how the balance speed is selected, as long as it can meet the takeoff requirements, a large amount of fuel will be wasted during cruising flight, so there is an urgent need to develop a propeller speed regulator that can select the speed and adjust and control the balance speed to ensure that the thrust of the propeller is large during takeoff and small during cruising flight. The flight of the plane is ensured by adjusting the rotational speed of the propeller and the angle of the blades, and the propeller only has one high-efficiency blade angle, and the propeller works less efficiently at other blade angles. In order to maintain the rotational speed of the constant speed propeller unchanged under the condition of changing flight conditions, the blade angle needs to be changed to absorb the power of the engine, which makes the propeller work less efficiently. In order to maintain the working efficiency of the propeller at a high level, it is also necessary to develop a propeller speed regulator that can select the speed and adjust and control the balance speed to keep the blade angle at a high-efficiency blade angle position. The existing propeller speed regulator does not have a small distance limiting mechanism, and the propeller adopts an end face tooth engagement mechanism for distance protection, which has a complex structure and increases the volume and weight of the propeller, and cannot meet the requirements of the use of aircraft and other flying vehicles, so there is an urgent need to develop a propeller speed regulator with small distance limiting and distance protection functions. The existing propeller has a propeller function that is realized by switching the oil circuit of the speed regulator and the oil circuit in the propeller, and the speed regulator and the propeller are provided with many oil circuits, and the structure of the oil circuit is very complex, which is not easy to manufacture and ensure the sealing of each oil circuit. The existing speed regulator does not have a beta control and reverse propeller function, and the plane landing and taxiing rely on methods such as reducing the blade angle of the propeller within a certain range to achieve a certain damping effect, but the effect is very small, the plane landing and taxiing distance is long, and a very long runway needs to be set, which wastes land resources and makes the utilization rate of existing land resources low. Therefore, there is also an urgent need to develop a speed regulator with a simple oil circuit that can control the propeller and realize the beta control and reverse propeller functions. SUMMARY

[0003] The present application aims at solving the above problems in the prior art, and provides a propeller speed regulator with selectable speed, controllable feathering, reversible propeller and balanced speed adjustment, which can improve the working efficiency of the propeller, save a large amount of fuel, improve the working safety and reliability, and shorten the taxiway.

[0004] To achieve the above object, the technical solution of the present application is as follows: a propeller speed regulator, comprising an upper housing assembly, a lower housing assembly, a bottom plate, an oil filter assembly, a speed selection mechanism installed in the inner holes of the upper and lower housing assemblies, the bottom plate and the oil filter assembly, a power turbine adjusting assembly installed in the upper housing assembly, a gear pump, a safety valve assembly, a beta valve assembly and a reset handle assembly connected to the power push-pull rod installed in the lower housing assembly; the upper housing assembly is sealingly fixed to the upper end surface of the lower housing assembly; the lower housing assembly is sealingly fixed to the upper end surface of the bottom plate.

[0005] The speed selection mechanism comprises a speed selection handle, a speed selection stop component, a reset torsion spring, a maximum speed stop, a feathering stop, a variable diameter screw shaft in the inner cavities of the upper and lower shell assemblies and the bottom plate, upper and lower spring seats, springs, bearings, a centrifugal weight assembly, a valve sleeve, a valve core and valve cap assembly and an insert piece; one end of the speed selection handle has a spline hole and the other end has a connection structure with the propeller shaft; the speed selection stop component is sleeved between the spline hole of the speed selection handle and the upper part of the variable diameter screw shaft, the outer spline of the speed selection stop component is connected with the inner spline of the speed selection handle, the inner spline of the speed selection stop component is connected with the outer spline of the upper part of the variable diameter screw shaft, and a limiting flange is arranged on the speed selection stop component; the maximum speed stop and the feathering stop are respectively fixed on the two small cylinders of the upper end surface of the upper shell assembly; the outer end of the large cylinder of the upper end surface of the upper shell assembly is sleeved with the reset torsion spring which is fixed at the upper end of the speed selection stop component and at the lower end of one of the small cylinders; the limiting flange of the speed selection stop component rotates between the maximum speed stop and the feathering stop; the middle and upper part of the variable diameter screw shaft is sleeved and threadedly connected in the threaded hole of the large cylinder of the upper end surface of the upper shell assembly, and the middle and lower part of the variable diameter screw shaft is interference fitted in the inner hole of the upper spring seat; the valve core and valve cap assembly comprises a valve core and a valve cap which is integrated with the upper end of the valve core, a lower spring seat is arranged on the outer circle of the upper end surface of the valve core, a groove is arranged on the inner circle of the lower spring seat, and the insert piece is arranged in the groove and connected with the key groove of the inner circle of the lower spring seat; the lower end of the variable diameter screw shaft is sleeved in the insert piece with a slight gap, the lower end with a larger diameter is located below the insert piece, and the springs fixed on the upper and lower spring seats are arranged on the variable diameter screw shaft; the valve core of the valve core and valve cap assembly is installed in the valve sleeve, and the bearing with a bottom protrusion is assembled in the gap of the upper end surface of the valve core; the centrifugal weight assembly comprising a centrifugal block is located in the inner cavity of the upper end of the lower shell assembly, the lower end of the centrifugal weight assembly is sleeved with a spline sleeve and clamped on the outer circle of the upper end of the valve sleeve, the hook end of the centrifugal block is in contact with the bottom protrusion of the bearing, and the valve sleeve is assembled in the mounting hole of the lower shell assembly with a slight gap, and the lower end of the valve sleeve is connected with the engine.

[0006] The gear pump is arranged in the low pressure oil tank of the bottom plate and comprises driving and driven gears and driving and driven shafts; the driving shaft uses the middle outer circle of the valve sleeve, and the driving gear is integrally formed on the middle outer circle of the valve sleeve; the driven shaft is fixedly installed in the lower shell assembly, and the driven gear is rotatably fixed on the driven shaft through a bearing.

[0007] The safety valve assembly comprises a cap I with a cross section of π, a spring shaft base, a pressure spring, a safety valve and a bushing I; the bushing I is fixed in a threaded installation hole of the lower housing assembly; the cap I is fixed on the upper end of the inner hole of the bushing I; the spring shaft base is arranged in the inner hole of the bushing I, and the upper end of the spring shaft base abuts against the inner hole of the cap I; the safety valve is sleeved in the variable-diameter inner hole of the bushing, and is clamped by the boss on the outer circle of the safety valve; the pressure spring is sleeved on the spring shaft base and the safety valve, and is compressed between the boss of the spring shaft base and the safety valve; the inner hole of the bushing I at the lower end of the safety valve is a high-pressure oil cavity, and a low-pressure oil cavity is further arranged between the peripheral wall of the bushing I and the lower housing assembly; the oil holes I and II are arranged on the peripheral wall of the bushing I, and communicate with the low-pressure oil cavity; the oil hole II further communicates with the inner hole of the bushing where the pressure spring is arranged; the distance between the spring shaft base and the safety valve is greater than the distance between the lower end surface of the safety valve and the lower end wall of the oil hole I; when the oil pressure of the high-pressure oil in the high-pressure oil cavity is greater than the pressure of the pressure spring, the high-pressure oil flows into the safety valve assembly from the high-pressure oil cavity, the safety valve moves upward, the oil hole I and the high-pressure oil cavity are communicated, and part of the high-pressure oil of the high-pressure oil outlet of the gear pump of the lower housing assembly flows into the low-pressure oil cavity through the oil hole I, until the oil pressure of the high-pressure oil in the high-pressure oil cavity is balanced with the spring force of the pressure spring, the safety valve moves downward, the oil hole I and the high-pressure oil cavity are not communicated, and the high-pressure oil pressure is stabilized at a pressure that can maintain the normal operation of the governor; the oil hole II communicates the inner hole of the bushing where the pressure spring is arranged with the low-pressure oil cavity, and in addition to maintaining the pressure balance in the inner hole, the low-pressure oil is also used for rust prevention of the spring and other parts, thereby increasing the service life of the parts.

[0008] The beta valve assembly comprises a bushing II, a valve, a reset spring, a U-shaped fork with a stepped portion and a central hole, and a cap II; one end of the valve is provided with a small-distance end plug, and the other end is fixed with the U-shaped fork; the bushing II is interference-fitted in the protruding circular mounting port of the lower housing assembly, the port is interference-fitted with an adjusting washer with the same diameter as the protruding circular mounting port of the lower housing assembly by the cap II, and the relative position of the small-distance end plug of the valve and the high-pressure oil outlet of the bushing II is adjusted by the adjusting washer; the end of the valve with the small-distance end plug is assembled in the bushing II with a slight gap, and the valve and the bushing II are sealed at the end position of the bushing II by a sealing ring; the reset spring sleeved on the valve and fixed in the groove of the U-shaped fork is pressed on the adjusting washer; the cap II has a variable-diameter inner hole with a diameter matched with the outer circle of the U-shaped fork, the outer circle of the stepped portion of the U-shaped fork, the adjusting washer and the outer circle of the circular mounting port, the cap II is sleeved on the outer circle of the U-shaped fork, the adjusting washer and the circular mounting port and is fixed on the circular mounting port, and the length of the inner hole part matched with the outer circle of the stepped portion of the U-shaped fork is the maximum range of movement of the valve; the valve is provided with an oil groove III, the bushing II is provided with a high-pressure oil outlet and a high-pressure oil inlet communicated with the oil groove III, and the inner cavity of the bushing II at the end of the small-distance end plug is an oil return cavity; in the normal working state, the high-pressure oil outlet is communicated with the oil groove III, the small-distance stopper moves to the position outside the circular mounting port, and the small-distance end plug closes the high-pressure oil outlet;

[0009] The power turbine adjusting assembly comprises a support rod fork assembly, a baffle support assembly, a plug and a nozzle, which are installed in the upper housing assembly. The support rod fork assembly comprises a counterweight, springs I and II, a fork, a small wheel and a support rod. The fork has a counterweight fixed at one end and a U-shaped fork fixed at the other end, which is matched with the cavity of the housing of the valve core valve cap assembly. The two ends of the U-shaped fork are fixed with pins, respectively. In use, the lower end of the pin is in abutment with the upper end wall of the valve cap of the valve core valve cap assembly. The end of the fork close to the counterweight is inserted into the through hole of the support rod, which is hinged to the support rod through the pin needle bearing assembled in the inner hole thereof and the pins assembled in the two opposite walls of the through hole of the support rod. The lower end of the fork inserted into the through hole of the support rod is U-shaped, the small wheel is arranged in the U-shaped groove of the fork, and the pin assembled in the inner hole thereof is fixed on the U-shaped end wall. The upper end surface of the support rod is fixed with the spring II, the lower end surface thereof has a U-shaped recess connected with the reset handle assembly, and the upper end surface of the fork is fixed with the spring I. The nozzle is fixed in the installation hole of the lower end side wall of the upper housing assembly, and the outer end of the nozzle has a plug. The baffle support assembly comprises a baffle and a spring III fixed on the side wall of the baffle. One end of the baffle is rotatably installed in the installation shell of the lower end side wall of the upper housing assembly, the other end is in abutment with the lower end of the counterweight, and in the normal state, one side wall of the baffle closes the nozzle, and the small wheel is in abutment with the other end side wall of the baffle. The U-shaped groove of the lower end of the support rod is inserted into the reset handle assembly. When the valve core valve cap is lifted or the reset handle assembly is operated, the counterweight presses the baffle of the baffle support assembly to open the nozzle to spray air.

[0010] The oil inlet of the engine is connected with the low-pressure oil tank opened on the bottom plate through the oil filter assembly. The outlet of the gear pump arranged in the low-pressure oil tank is divided into two paths through the oil inlet hole in the lower housing assembly. One path is connected with the high-pressure oil inlet of the beta valve assembly, and the other path is connected with the high-pressure oil cavity of the safety valve assembly. The low-pressure oil cavity of the safety valve assembly is connected with the low-pressure oil tank through the oil return channel of the lower housing assembly. The high-pressure oil outlet of the beta valve assembly is connected with the high-pressure oil inlet of the speed selection mechanism through the high-pressure oil inlet hole in the lower housing assembly. The high-pressure oil outlet of the speed selection mechanism is connected with the propeller oil cavity. The oil return cavity of the beta valve assembly is connected with the oil tank II of the speed selection mechanism through the oil return channel of the lower housing assembly. The oil return port of the speed selection mechanism is connected with the oil return tank of the engine.

[0011] Further preferably, the speed selection handle of the speed selection mechanism has a broken peripheral wall at one end of the inner spline hole. One of the two end walls of the broken peripheral wall has an opening, and the other has a threaded hole. The two are fixed together by the hole spherical cylindrical head screw I and the light spring washer I. This structure is easy to install and disassemble.

[0012] Further preferably, the speed selection stop assembly of the speed selection mechanism has a broken peripheral wall. One of the two end walls of the broken peripheral wall has an opening, and the other has a threaded hole. The two are fixed together by the hole spherical cylindrical head screw II and the light spring washer II. This structure is easy to install and disassemble.

[0013] Further preferably, the centrifugal weight assembly of the speed selection mechanism comprises a support, two pairs of distributed centrifugal blocks and a spiral retainer; the lower end of the support is clamped on the outer circle of the upper end of the valve sleeve through a spline sleeve; the two centrifugal blocks are respectively assembled on the support by a shaft and a bearing gap, and a spiral retainer is clamped and fixed on the outer wall of the upper end of the support; the hook end top-connected to the bottom surface boss of the bearing is provided with a circular arc surface. The presence of the spiral retainer makes the shaft not easy to come out, and the structure has high reliability; the circular arc surface reduces the friction of the bottom surface boss of the bearing, and increases the service life.

[0014] Further preferably, the distance between the spring shaft seat and the safety valve of the safety valve assembly is 2.8 mm, so as to ensure that the pressure of the pressure spring meets the use requirements.

[0015] Further preferably, the upper end of the seat of the spring shaft seat of the safety valve assembly is top-connected to the inner hole of the cap I through a gasket I, and the lower end is pressure-connected to the pressure spring through a gasket II. The thickness of the gasket I can be adjusted to ensure the distance between the spring shaft seat and the safety valve, and the thickness of the gasket II can be adjusted to adjust the pressure of the pressure spring. Such structure is easy to install and adjust, and can meet the parameter requirements.

[0016] Further preferably, the bushing I of the safety valve assembly is threadedly fixed in the threaded mounting hole in the lower housing assembly; and the cap I is threadedly fixed on the upper end of the inner hole of the bushing I through another gasket between the upper end wall of the bushing I and the lower end wall of the cap I. The connection is reliable and not easy to fall off.

[0017] Further preferably, the cap of the beta valve assembly is sealed and dustproof by a plastic gasket embedded in the inner wall of the port of the cap; and another sealing ring is press-fitted between the bushing, the circular mounting port and the adjusting gasket.

[0018] Further preferably, the structure that the baffle one end of the baffle support assembly of the power turbine adjusting assembly is rotatably installed in the mounting shell protruding from the lower end side wall of the upper housing assembly is that: the bearing is assembled at the support shaft root of the support seat, the baffle is assembled in the bearing, and the support shaft is sleeved with the spring IV through a gasket; the support seat, the bearing and the spring IV are integrally press-fitted in the inner hole of the mounting shell.

[0019] The application has the following five working states:

[0020] a) Selection of balanced rotating speed and feathering:

[0021] The selected speed handle on the invention is operated by the propeller lever on the airplane, changing the position of the variable screw shaft and the spring pressure, so that the propeller can work at different balance speeds. The governor is driven by the engine transmission mechanism, at this time, the spring force and the centrifugal force of the centrifugal weight assembly are balanced, the shoulder of the valve core blocks the oil way to the propeller chamber, and the propeller works at a balance speed.

[0022] When the selected speed handle moves to the feathering position, the valve core and cap assembly is lifted, the high pressure oil outlet and the return oil port are connected, the high pressure oil in the propeller chamber flows into the low pressure oil tank, reducing the pressure on the propeller servo piston, at this time, the propeller servo piston moves to the feathering position under the action of the feathering spring force and the blade weight centrifugal force.

[0023] b) Overspeed cycle and protection:

[0024] In the case of overspeed, the centrifugal block of the governor centrifugal weight assembly is thrown upward, overcoming the spring force and lifting the valve core and cap assembly, the high pressure oil outlet and the return oil port are connected, the high pressure oil in the propeller chamber is diverted to the low pressure oil tank, the propeller pitch is increased, the load is increased, the propeller speed is reduced, until the valve core and cap assembly is lowered, the spring force and the centrifugal force are balanced, the speed returns to the selected balance speed, and the shoulder of the valve core blocks the oil way to the propeller chamber.

[0025] When the governor overspeeds to a certain value, the power turbine adjusting assembly will work, the valve core and cap assembly is lifted to a certain extent, pushing the fork to rotate, the weight block presses the baffle of the baffle support assembly to open the nozzle, by reducing the pressure on one side of the signal conversion device, providing a signal to the fuel regulator, reducing the fuel supply to the engine, so that the engine power is reduced, and the propeller speed is also reduced to the required range, preventing the flywheel.

[0026] c) Under speed cycle:

[0027] In the case of under speed, the spring force overcomes the axial component of the centrifugal force of the centrifugal weight assembly, the valve core and cap assembly is lowered, the high pressure oil outlet and the high pressure oil inlet are connected, the high pressure oil enters the propeller chamber, the propeller pitch is reduced, the load is reduced, the propeller speed is increased, until the valve core and cap assembly is lifted, the spring force and the centrifugal force are balanced, the speed returns to the selected balance speed, and the shoulder of the valve core blocks the oil way to the propeller chamber.

[0028] d) β operation and reverse pitch:

[0029] When the propeller is in the reverse operation, the rear power lever makes the propeller rotate at a lower speed than the selected speed. The speed regulator can make the propeller move to the small distance direction. When entering the beta range, the required propeller angle can be selected through the power lever. The specific process is as follows: the rear power lever → the reverse lever action → the reset handle action → the support rod downward movement → the counterweight downward pressing the baffle opening the nozzle → P 燃 The gas path is discharged → the engine power is reduced → the underspeed condition occurs → the valve core and valve cap are lowered → the high-pressure oil enters the propeller cavity → the propeller moves to the reverse direction, and the moving result is that the low-distance stop ring drives the beta valve to move forward, and the small distance end block closes the oil path to the propeller cavity, so as to automatically maintain at a certain propeller angle. Continue to pull the rear power lever, and the beta valve moves backward again, and the small distance end block is away from the oil path to the propeller cavity, and the oil path is connected, and the high-pressure oil enters the propeller cavity again, so that the propeller moves to the reverse direction. The moving result is that the beta valve closes the oil path again. This process is repeated until full reverse is achieved.

[0030] e) Small distance limit distance protection:

[0031] When the engine is at idle speed, the high-pressure oil discharged by the speed regulator enters the propeller cavity, and the propeller moves from the forward direction to the small distance direction. When the propeller blade angle becomes smaller than the angle α, the propeller continues to become smaller, the beta valve moves under the action of the reverse lever and the elastic force of the reset spring, the small distance end block on the beta valve closes the high-pressure oil outlet, so that the propeller blade angle is automatically maintained at a certain propeller blade angle, so that the propeller is distance-protected, and the protection function is achieved.

[0032] The advantages and beneficial effects of the present application are: relatively simple structure, convenient installation and disassembly, selectable speed, controllable forward and reverse rotation, adjustable and controllable balance speed function; the propeller using the speed regulator has high working efficiency, saves a large amount of fuel, has high working safety and reliability, and shortens the taxiway. The speed regulator itself has an overspeed protection function, so that the flight of the airplane is safer and more reliable. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present application;

[0034] Figure 2 It is a top view of the present application;

[0035] Figure 3 It is a top view of the centrifugal counterweight assembly of the speed selection mechanism in the present application;

[0036] Figure 4 It is an installation structure schematic diagram of the safety valve assembly in the present application;

[0037] Figure 5 It is a structural schematic diagram of the safety valve assembly in the present application;

[0038] Figure 6Schematic diagram of the installation structure of the beta valve assembly in the present invention;

[0039] Figure 7 Schematic diagram of the structure of the valve in the beta valve assembly of the present invention;

[0040] Figure 8 This is a top view of the installation of the upper housing assembly, the power turbine adjustment assembly and the speed selection mechanism in the present invention;

[0041] Figure 9 for Figure 8 AA cross-sectional view;

[0042] Figure 10 Schematic diagram of the structure of the strut fork assembly in the power turbine adjustment assembly of the present invention;

[0043] Figure 11 This is a front view of the baffle support assembly in the power turbine adjustment assembly of the present invention;

[0044] Figure 12 A bottom view of the baffle support assembly in the power turbine adjustment assembly of the present invention;

[0045] Figure 13 for Figure 8 BB cross-sectional view;

[0046] Figure 14 This is a diagram showing the relative position of the valve core boss of the speed selection mechanism and the oil passage hole leading to the propeller chamber during overspeed;

[0047] Figure 15 This is a diagram showing the relative position relationship between the valve core boss of the speed selection mechanism and the oil passage hole leading to the propeller chamber during underspeed;

[0048] Figure 16 This is a diagram showing the relative position relationship between the valve core boss of the speed selection mechanism and the oil passage hole leading to the propeller chamber when the speed is balanced. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] like Figures 1 to 16 As shown, this embodiment includes an upper housing assembly 1, a lower housing assembly 9, a base plate 16, an oil filter assembly, a speed selector mounted within the inner bore of the upper housing assembly 1, the lower housing assembly 9, the base plate 16, and the oil filter assembly, a power turbine adjustment assembly mounted within the upper housing assembly 1, a gear pump 97, a safety valve assembly 96, a beta valve assembly 69, and a reset handle assembly 70 connected to the power push-pull rod mounted within the lower housing assembly 9. The upper housing assembly 1 is sealed and secured to the upper end surface of the lower housing assembly 9 by a sealing gasket. The lower housing assembly 9 is sealed and secured to the upper end surface of the base plate 16 by a sealing ring.

[0051] The speed selection mechanism comprises a speed selection handle 3, a speed selection stop component 5, a reset torsion spring 2, a maximum speed stop 14, a feathering stop 15, a variable diameter screw shaft 4 in the inner cavities of the upper housing component 1, the lower housing component 9 and the bottom plate 16, an upper spring seat 13, a lower spring seat 17, a spring 6, a bearing 7, a centrifugal weight component 8, a valve sleeve 10, a valve core and valve cap component 11 and an insert piece 12. The speed selection handle 3 has a spline hole at one end and a propeller rod connecting structure at the other end. Preferably, the end of the speed selection handle 3 with the inner spline hole has a broken peripheral wall, a through hole and a threaded hole in the two end walls of the broken peripheral wall, and the two are fixed together by a hole spherical cylindrical head screw II 29 and a light spring washer II 30. The speed selection stop component 5 is sleeved between the spline hole of the speed selection handle 3 and the upper part of the variable diameter screw shaft 4, the outer spline is connected with the inner spline of the speed selection handle 3, the inner spline is connected with the outer spline of the upper part of the variable diameter screw shaft 4, and a limiting flange is arranged on the speed selection stop component 5. Preferably, the speed selection stop component 5 has a broken peripheral wall, a through hole and a threaded hole in the two end walls of the broken peripheral wall, and the two are fixed together by a hole spherical cylindrical head screw II 29 and a light spring washer II 30. The maximum speed stop 14 and the feathering stop 15 are respectively fixed on the two small cylinders on the upper end surface of the upper housing component 1. The upper end of the upper housing component 1 has an upper end fixed on the speed selection stop component 5 and a lower end fixed on one of the small cylinders, and the outer end of the large cylinder on the upper end is sleeved with the reset torsion spring 2. The limiting flange of the speed selection stop component 5 rotates between the maximum speed stop 14 and the feathering stop 15. The middle and upper part of the variable diameter screw shaft 4 is sleeved and connected in a trapezoidal thread sealing manner in the threaded hole of the large cylinder on the upper end of the upper housing component 1, and the middle and lower part of the variable diameter screw shaft 4 is assembled in the inner hole of the upper spring seat 13 in an interference manner. The valve core and valve cap component 11 comprises a valve core 19 and a valve cap 18 integrated with the upper end of the valve core 19, the outer circle of the upper end surface of the valve core 19 is provided with an integrated lower spring seat 17, the inner circle of the lower spring seat 17 is provided with a groove, and the insert piece 12 is arranged in the groove and connected with the key groove of the inner circle of the lower spring seat 17. The lower end of the valve sleeve 10 has a spline connected with the output shaft of the engine. The lower end of the variable diameter screw shaft 4 is sleeved in the insert piece 12 in a slight gap, and the thickened lower end is located below the insert piece 12. The spring 6 fixed on the upper spring seat 13 and the lower spring seat 17 is sleeved on the variable diameter screw shaft 4. The valve core 19 of the valve core and valve cap component is installed in the valve sleeve 10, and the bearing 7 with a bottom convex is assembled in the gap between the valve core 19 and the lower end surface of the valve cap 18. The centrifugal weight component 8 comprising a centrifugal block is located in the inner cavity of the upper end of the lower housing component 9, the lower end of the centrifugal weight component 8 is sleeved and clamped on the outer circle of the upper end of the valve sleeve 10 through the spline, and the hook end of the centrifugal block is abutted on the bottom convex of the bearing 7.Preferably, the centrifugal weight assembly comprises a support 32, two pairs of distributed centrifugal blocks 33 and a spiral retaining ring 31; the lower end of the support 32 is fixed to the upper end of the valve sleeve 10 by means of a spline sleeve. The two centrifugal blocks 33 are respectively assembled on the support 32 by means of a shaft 35, a bearing 36 and a gasket 34. A spiral retaining ring 31 is fixed to the outer wall of the upper end of the support 32. The two ends of the shaft 35 are in abutment with the inner end wall of the spiral retaining ring 31. The hook end face in abutment with the boss on the bottom surface of the bearing 7 is provided with a circular arc face. The valve sleeve 10 is assembled in the mounting hole of the lower housing assembly 9 with a slight gap, and the lower end thereof is connected with the spline of the engine. The outer circle of the valve core 19 is provided with a shoulder 20. The outer circle of the valve core 19 above and below the shoulder 20 is provided with an oil groove I 22 and an oil groove II 24. The valve sleeve 10 is provided with an inlet high-pressure oil port 26, an outlet high-pressure oil port 23 and an oil return port I 25 which are in communication with the oil groove I 22 and the oil groove II 24, respectively. When the propeller operates at the selected balance speed, the shoulder 20 blocks the outlet high-pressure oil port 23 of the valve sleeve 10. When the speed of the propeller decreases, the shoulder 20 is below the outlet high-pressure oil port 23, the outlet high-pressure oil port 23 is in communication with the inlet high-pressure oil port 26, the propeller is supplied with high-pressure oil, and the speed increases until it reaches the selected balance speed. When the speed of the propeller increases, the shoulder 20 is above the outlet high-pressure oil port 23, the outlet high-pressure oil port 23 is in communication with the oil return port I 25, the propeller is supplied with oil, and the speed decreases until it reaches the selected balance speed. 39 is a boss on the outer end wall of the valve cap 18.

[0052] The gear pump 97 is arranged at one end of the low-pressure oil groove in the bottom plate 16 and comprises a driving gear 38 and a driven gear 71, a driving shaft and a driven shaft 72. The driving shaft is arranged on the outer circle of the middle part of the valve sleeve 10, and the driving gear 38 is integrally formed on the outer circle of the middle part of the valve sleeve 10. The driven shaft 72 is fixedly installed in the lower housing assembly 9, and the driven gear 71 is rotatably fixed on the driven shaft 72 by means of a bearing. 37 is a protective cover installed during transportation.

[0053] The safety valve assembly 96 comprises a cap I 41 with a ∏-shaped cross-section, a spring shaft seat 44, a pressure spring 45, a safety valve 46, and a bushing I 47. Bushing I 47 is threadedly secured to a threaded mounting hole in the lower housing assembly 9 via a washer 48. Cap I 41 is threadedly secured to the upper end of the inner bore of bushing I 47 via another washer 40 between the upper and lower ends of bushing I 47. The spring shaft seat 44 is positioned within the inner bore of bushing I 47, with its upper end resting against the inner bore of cap I 41. The safety valve 46 is inserted into the reduced diameter inner bore of bushing I 47 and secured via a boss 52 on its outer circumference. Preferably, the upper end of the spring shaft seat 44 rests against the inner bore of cap I 41 via a washer I 42, while the lower end is pressed against the pressure spring 45 via a washer II 43. The pressure spring 45 is mounted on the spring seat 44 and the safety valve 46, compressed between the spring seat 44 and the boss 52 of the safety valve 46. The inner bore of the bushing I 47 below the safety valve 46 forms a high-pressure oil chamber 49. A low-pressure oil chamber 51 is also defined between its peripheral wall and the lower housing assembly 9. Oil holes I 50 and II 53 are provided on its peripheral wall, both communicating with the low-pressure oil chamber 51. Oil hole II 53 also communicates with the inner bore of the bushing I 47, where the pressure spring 45 resides. The distance between the spring seat 44 and the safety valve 46 is greater than the distance between the lower end surface of the safety valve 46 and the lower end wall of the oil hole I 50. Preferably, the distance between the spring seat 44 and the safety valve 46 is 2.8 mm. When the high-pressure oil pressure in high-pressure oil chamber 49 exceeds the pressure of pressure spring 45, high-pressure oil flows from high-pressure oil chamber 49 into safety valve assembly 96. Safety valve 46 moves upward, connecting oil hole I 50 with high-pressure oil chamber 49. A portion of the high-pressure oil from the high-pressure oil outlet of the gear pump in lower housing assembly 9 flows through oil hole I 50 into low-pressure oil chamber 51 until the high-pressure oil pressure in high-pressure oil chamber 49 balances the spring force of pressure spring 45. Safety valve 46 moves downward, disconnecting oil hole I 50 from high-pressure oil chamber 49, and stabilizing the high-pressure oil pressure at a level sufficient to maintain normal operation of the governor. Oil hole II 53 connects the inner bore of bushing I 47, where pressure spring 45 resides, with low-pressure oil chamber 51. This not only maintains pressure balance inside and outside the inner bore but also allows low-pressure oil to be used to prevent rust on components such as the pressure spring, thereby increasing component life.

[0054] The beta valve assembly 69 includes bushing II 58, valve 59, return spring 61, U-shaped fork 60 with step and center hole, and cap II 64. The valve 59 is provided with a small distance end plug 66 at one end and is fixed with the U-shaped fork 60 at the other end. The bushing II 58 is interference fitted in the circular mounting port 65 protruding from the lower housing assembly 9, and the port is interference fitted with the adjusting washer 63 having the same diameter as the circular mounting port 65 protruding from the lower housing assembly 9 by the cap II 64; the relative position of the valve small distance end plug 66 and the bushing II high pressure oil outlet 55 is adjusted by the adjusting washer 63. The valve 59 is slightly gap fitted in the bushing II 58 at the end with the small distance end plug 66, and the valve 59 and the bushing II 58 are sealed at the end of the bushing II 58 by a sealing ring. Another sealing ring is interference fitted between the bushing II 58, the circular mounting port 65, and the adjusting washer 63. The return spring 61 fitted on the valve 59 and fixed in the groove of the U-shaped fork 60 is pressed on the adjusting washer 63. The cap II 64 has a variable diameter inner hole with a diameter matching the outer circle of the U-shaped fork 60 and the U-shaped fork step outer circle 67, the adjusting washer 63, and the outer circle of the circular mounting port 65, which is fitted on the outer circle of the U-shaped fork 60, the adjusting washer 63, and the circular mounting port 65 and is threadedly fixed on the circular mounting port 65, and the length of the inner hole part matching the U-shaped fork step outer circle 67 is the maximum range of the valve 59 movement. Preferably, the cap II 64 and the U-shaped fork 60 are sealed against dust by the plastic washer 62 embedded in the port inner wall of the cap II 64. The valve 59 is provided with an oil groove III 56, the bushing II 58 is provided with a high pressure oil outlet 55 and a high pressure oil inlet 57 communicating with the oil groove III 56, and the inner cavity of the bushing II 58 at the end of the small distance end plug 66 is the oil return cavity 54. In normal working condition, the high pressure oil outlet 55 communicates with the oil groove III 56, and when the small distance is limited, the valve 59 moves to the outer end of the circular mounting port 65 in place, and the small distance end plug 66 exactly closes the high pressure oil outlet 55. In use, the oil return cavity 54 directly communicates with the oil return hole 68 in the lower housing assembly 9, the high pressure oil outlet 55 and the high pressure oil inlet 57 are connected to the high pressure oil inlet 26 of the governor speed selection mechanism and the high pressure oil outlet of the gear pump, respectively, through the high pressure oil holes in the lower housing assembly 9, the outer end of the U-shaped fork 60 is connected to the anti-paddle lever, and the anti-paddle lever is connected to the power lever and the propeller.

[0055] The power turbine regulating assembly comprises a support rod fork assembly, a baffle support assembly, a plug 75 and a nozzle 78 installed in the upper housing assembly 1. The support rod fork assembly comprises a weight 89, springs I 92 and II 91, a fork 93, a small wheel 86 and a support rod 84. The fork 93 has the weight 89 fixed at one end by a resilient cylindrical pin 88 and a U-shaped fork at the other end matching the U-shaped cavity of the upper housing assembly 1 in which the valve core valve cap assembly is installed. The U-shaped fork has a pin 94 fixed at each end. In use, the lower end of the pin 94 abuts against the boss 39 on the upper end wall outside the valve cap of the valve core valve cap assembly. The end of the fork 93 close to the weight 89 is inserted into the through hole of the support rod 84, which is hinged to the support rod 84 by the needle bearing 87 fitted into the inner hole of the support rod 84 and the pins 90 fitted into the through hole of the support rod 84 at the opposite walls. The lower end of the fork 93 inserted into the through hole of the support rod 84 is U-shaped, the small wheel 86 is inserted into the U-shaped slot of the fork 93, and the cylindrical pin 85 fitted into the inner hole is fixed to the U-shaped end wall. The spring II 91 is fixed to the upper end surface of the support rod 84, the U-shaped recess 95 for connecting the reset handle assembly is provided on the lower end surface of the support rod 84, and the spring I 92 is fixed to the upper end surface of the fork 93. The nozzle 78 is fixed into the installation hole protruding from the lower end side wall of the upper housing assembly 1, and the plug 75 is provided at the outer end of the nozzle 78. The baffle support assembly comprises a baffle 79 and a spring III 77 fixed to the side wall of the baffle 79. The baffle 79 is rotatably installed in the installation shell protruding from the lower end side wall of the upper housing assembly 1 at one end and abuts against the lower end of the weight 89 at the other end. In the normal state, one side wall of the baffle 79 closes the nozzle 78, and the small wheel 86 abuts against the other side wall of the baffle 79. The U-shaped slot at the lower end of the support rod 84 is inserted into the reset handle assembly. When the valve core valve cap rises, the weight 89 presses down the baffle 79 of the baffle support assembly, and the nozzle 78 is opened to spray gas. Preferably, the structure in which one end of the baffle 79 of the baffle support assembly is rotatably installed in the installation shell protruding from the lower end side wall of the upper housing assembly 1 is that the bearing 81 is fitted into the support shaft root of the support seat 80, the baffle 79 is fitted into the bearing 81, and the spring IV 83 is sleeved on the support shaft through the gasket 82. The support seat, the bearing 81 and the spring IV 83 are integrally pressed into the inner hole of the installation shell. Both 74 and 76 are sealing rings.

[0056] The oil from the engine is connected to the low pressure oil groove on the connecting plate 16 through the oil filter assembly. The outlet of the gear pump, which is located in the low pressure oil groove, is divided into two paths through the oil inlet hole in the lower housing assembly 9. One path is connected to the high pressure oil inlet 57 of the beta valve assembly 69, and the other path is connected to the high pressure oil cavity 49 of the safety valve assembly 96. The low pressure oil cavity 51 of the safety valve assembly 96 is connected to the low pressure oil groove through the oil return path of the lower housing assembly 9. The high pressure oil outlet 55 of the beta valve assembly 69 is connected to the high pressure oil inlet 26 of the speed selector mechanism through the high pressure oil inlet hole 21 in the lower housing assembly 9. The high pressure oil outlet 23 of the speed selector mechanism is connected to the propeller oil cavity. The oil return cavity 54 of the beta valve assembly 69 is connected to the oil groove II 24 of the speed selector mechanism through the oil return path 68 of the lower housing assembly 9. The oil return port 25 of the speed selector mechanism is connected to the oil return groove of the engine.

[0057] Of course, the present application has other various embodiments, and those skilled in the art can make corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should belong to equivalent technical improvements and belong to the protection scope of the claims of the present application.

Claims

1. A propeller speed governor, characterized in that: It includes an upper housing assembly, a lower housing assembly, a base plate, an oil filter assembly, a speed selection mechanism installed in the inner holes of the upper and lower housing assemblies, the base plate and the oil filter assembly, a power turbine adjustment assembly installed in the upper housing assembly, a gear pump, a safety valve assembly, a beta valve assembly and a reset handle assembly connected to the power push-pull rod installed in the lower housing assembly; the upper housing assembly is sealed and fixed to the upper end surface of the lower housing assembly; the lower housing assembly is sealed and fixed to the end surface of the base plate; The speed selection mechanism includes a speed selection handle, a speed selection stop assembly, a reset torsion spring, a maximum speed stop, a propeller stop, a variable diameter screw shaft, an upper and lower spring seat, a spring, a bearing, a centrifugal weight assembly, a valve sleeve, a valve core valve cap assembly and an insert located in the upper and lower housing assemblies and the inner cavity of the base plate; a spline hole is provided at one end of the speed selection handle, and a connection structure with the propeller rod is provided at the other end; the upper part of the speed selection stop assembly is sleeved between the spline hole of the speed selection handle and the upper part of the variable diameter screw shaft, the outer spline of which is connected to the inner spline of the speed selection handle, and the inner spline is connected to the outer spline of the upper part of the variable diameter screw shaft, on which a limited flange is provided; the maximum speed stop and The feathering stops are respectively fixed on the two small cylinders on the upper end face of the upper shell assembly; the outer end of the large cylinder at the upper end of the upper shell assembly is sleeved with a return torsion spring whose upper end is fixed on the speed selection stop assembly and whose lower end is fixed on one of the small cylinders; the speed selection stop assembly limit flange rotates between the maximum speed stop and the feathering stop; the middle and upper part of the reducing screw shaft is sleeved and threadedly sealed in the threaded hole opened in the large cylinder at the upper end of the upper shell assembly, and the tapered part of the middle and lower part is interference fitted in the inner hole of the upper spring seat; the valve core and valve bonnet assembly includes a valve core and a valve bonnet integrated with the upper end of the valve core, an integral lower spring seat is provided on the outer circle of the upper end face of the valve core, and an inner circle of the lower spring seat There is a circle of groove on the top, the insert is placed in the groove and connected to the inner keyway of the lower spring seat; the lower end of the reducing screw shaft is sleeved in the insert with a slight gap, and the lower end with a thicker diameter is located below the insert. The spring fixed on the upper and lower spring seats is passed through the reducing screw shaft; the valve core of the valve core and valve cap assembly is installed in the valve sleeve, and the upper gap of the valve core on the lower end face of the valve cap is equipped with a bearing with a bottom boss; the centrifugal counterweight assembly including the centrifugal block is located in the inner cavity of the upper end of the lower housing assembly, and its lower end is clamped on the outer circle of the upper end of the valve sleeve through a spline sleeve, and the hook end of the centrifugal block is connected to the bottom boss of the bearing; the valve sleeve is assembled in the installation of the lower housing assembly The hole has an engine connection mechanism at its lower end; a convex shoulder is provided on the outer circle of the valve core, and oil grooves I and II are provided on the outer circle of the valve core above and below the convex shoulder; the valve sleeve is provided with a high-pressure oil inlet and a high-pressure oil outlet connected to the oil groove I, and an oil return port I connected to the oil groove II; when the propeller operates normally at the selected balanced speed, the convex shoulder blocks the high-pressure oil outlet on the valve sleeve; when the propeller speed becomes slower than the selected balanced speed, the convex shoulder is at the lower end of the high-pressure oil outlet, and the high-pressure oil outlet is connected to the high-pressure oil inlet; when the propeller speed becomes faster than the selected balanced speed, the convex shoulder is at the upper end of the high-pressure oil outlet, and the high-pressure oil outlet is connected to the oil return port I; The centrifugal counterweight assembly of the speed selection mechanism includes a support, two correspondingly distributed centrifugal blocks and a spiral retaining ring; the lower end of the support is clamped on the outer circle of the upper end of the valve sleeve through a spline sleeve; the two centrifugal blocks are respectively assembled on the support through the shaft and the bearing clearance, and a circle of spiral retaining ring is clamped and fixed on the outer wall of the upper end of the support, and the two ends of the shaft are connected to the inner end wall of the spiral retaining ring; The hook end connected to the bottom boss of the bearing is provided with an arc surface; One end of the gear pump is arranged in the low-pressure oil tank of the base plate, and includes driving and driven gears, and driving and driven shafts; the driving shaft uses the outer circle of the middle part of the valve sleeve, and the driving gear is integrally formed on the outer circle of the middle part of the valve sleeve; the driven shaft is fixedly installed in the lower housing assembly, and the driven gear is rotatably fixed to the driven shaft through a bearing; The safety valve assembly includes a cap I with a ∏-shaped cross section, a spring shaft seat, a pressure spring, a safety valve and a bushing I; the bushing I is threadedly fixed in a threaded mounting hole on the lower housing assembly; the cap I is threadedly fixed to the upper end of the inner hole of the bushing I, the spring shaft seat is placed in the inner hole of the bushing I, and its upper end rests on the inner hole of the cap I, and the safety valve sleeve is clamped in the variable diameter inner hole of the bushing through the boss on its outer circle; the pressure spring is sleeved on the spring shaft seat and the safety valve, and is compressed between the boss of the spring shaft seat and the safety valve; the inner hole of the bushing I at the lower end of the safety valve is a high-pressure oil chamber, and its peripheral wall A low-pressure oil chamber is also provided between the lower housing assembly and the lower housing assembly, and oil holes I and II are provided on its peripheral wall, both of which are connected to the low-pressure oil chamber; oil hole II is also connected to the inner hole of the bushing where the pressure spring is located; the distance between the spring shaft seat and the safety valve is greater than the distance between the lower end surface of the safety valve and the lower end wall of oil hole I; when the high-pressure oil pressure in the high-pressure oil chamber exceeds the pressure of the pressure spring, the high-pressure oil flows from the high-pressure oil chamber into the safety valve assembly, the safety valve moves upward, and oil hole I is connected to the high-pressure oil chamber. When the high-pressure oil pressure in the high-pressure oil chamber is balanced with the spring force of the pressure spring, oil hole I and the high-pressure oil chamber are disconnected; The bushing I of the safety valve assembly is threadedly fixed to the threaded mounting hole of the lower shell assembly through a washer; the cap I is threadedly fixed to the upper end of the inner hole of the bushing I through another washer between the upper end wall of the bushing I and the lower end wall of the cap I; The beta valve assembly includes a bushing II, a valve, a return spring, a U-shaped fork with a step and a center hole, and a cap II; a small-pitch end plug is provided at one end of the valve, and a U-shaped fork is fixed at the other end; the bushing II is interference-pressed into the circular mounting opening protruding from the lower shell assembly, and the port is press-fitted with an adjusting gasket of the same diameter as the circular mounting opening protruding from the lower shell assembly by the cap II, and the relative position of the small-pitch end plug of the valve and the high-pressure oil outlet of the bushing II is adjusted by adjusting the gasket; a micro-gap at one end of the valve with the small-pitch end plug is assembled in the bushing II, and the valve and the bushing II are sealed at the end of the bushing II by a sealing ring; a return spring sleeved on the valve and fixed in the U-shaped fork groove is pressed onto the adjusting gasket The cap II has a variable diameter inner hole whose diameter matches the outer circle of the U-shaped fork and the outer circle of the U-shaped fork step, the adjusting washer and the outer circle of the circular mounting opening. The cap II is sleeved on the U-shaped fork, the adjusting washer and the outer circle of the circular mounting opening and fixed on the circular mounting opening. The length of the inner hole portion matching the outer circle of the U-shaped fork step is the maximum range of movement of the valve. The valve is provided with an oil groove III, and the bushing II is provided with a high-pressure oil outlet and a high-pressure oil inlet connected to the oil groove III. The inner cavity of the bushing II at the end of the small-pitch end plug is an oil return cavity. Under normal working conditions, the high-pressure oil outlet is connected to the oil groove III. When the small-pitch limit is applied, the valve moves to the outer end of the circular mounting opening and the small-pitch end plug just closes the high-pressure oil outlet. A plastic washer is embedded in the inner wall of the cap port between the cap and the U-shaped fork of the beta valve assembly; another sealing ring is pressed between the bushing, the circular mounting port and the adjusting washer; The power turbine adjustment assembly includes a support rod fork assembly, a baffle support assembly, a plug cover and a nozzle installed in the upper shell assembly; the support rod fork assembly includes a counterweight, springs I and II, a fork, a small wheel and a support rod; a counterweight is fixed to one end of the fork, and the other end is a U-shaped fork that matches the shell cavity for installing the valve core valve cap assembly, and pins are fixed to both ends of the U-shaped fork; when in use, the lower end of the pin is connected to the upper end wall of the valve cap of the valve core valve cap assembly; the end of the fork close to the counterweight is passed through the through hole of the support rod, and is hinged to the support rod by a needle bearing interference-fitted in its inner hole and pins interference-fitted at both ends on the two opposite walls of the through hole of the support rod; the lower end of the fork placed in the through hole of the support rod is U-shaped, and the small wheel is placed in the U-shaped groove of the fork, and the clearance is fitted in it The pin in the inner hole is fixed to the U-shaped end wall; a spring II is fixed to the upper end face of the support rod, and a U-shaped groove connected to the reset handle assembly is provided on its lower end face, and a spring I is fixed to the upper end face of the shift fork; the nozzle is fixed in a mounting hole protruding from the lower end side wall of the upper shell assembly, and a plug cover is provided at the outer end of the nozzle; the baffle support assembly includes a baffle and a spring III fixed to the side wall of the baffle, one end of the baffle is rotatably mounted in a mounting shell protruding from the lower end side wall of the upper shell assembly, and the other end is connected to the lower end of the counterweight block, and in a normal state, one side wall of the baffle closes the nozzle, and the small wheel is connected to the side wall of the other end of the baffle; the U-shaped groove at the lower end of the support rod is plugged into the reset handle assembly; when the valve core valve cap rises or the reset handle assembly is actuated, the counterweight block presses down the baffle of the baffle support assembly to open the nozzle for jetting; The incoming oil of the engine is connected to the low-pressure oil tank opened on the bottom plate through the oil filter assembly. The gear pump outlet at one end is placed in the low-pressure oil tank and is divided into two paths through the oil inlet hole in the lower casing assembly, one path is connected to the high-pressure oil inlet of the beta valve assembly, and the other path is connected to the high-pressure oil chamber of the safety valve assembly; the low-pressure oil chamber of the safety valve assembly is connected to the low-pressure oil tank through the return oil line of the lower casing assembly; the high-pressure oil outlet of the beta valve assembly is connected to the high-pressure oil inlet of the speed selection mechanism through the high-pressure oil inlet hole in the lower casing assembly, and the high-pressure oil outlet of the speed selection mechanism is connected to the propeller oil chamber; the return oil chamber of the beta valve assembly is connected to the oil tank II of the speed selection mechanism through the return oil line of the lower casing assembly; the return oil port of the speed selection mechanism is connected to the return oil tank of the engine.

2. The propeller speed governor according to claim 1, characterized in that: The speed selection handle of the speed selection mechanism has a peripheral wall at one end with an inner spline hole, and a through hole and a threaded hole are opened on the two end walls of the disconnected peripheral wall, and the two are fixed together by a spherical cylindrical head screw I with a hole and a light spring washer I.

3. The propeller speed governor according to claim 2, characterized in that: The peripheral wall of the speed selection stop assembly of the speed selection mechanism is disconnected, and a through hole and a threaded hole are opened on the two end walls of the disconnected peripheral wall, and the two are fixed together by a spherical cylindrical head screw II with a hole and a light spring washer II.

4. The propeller speed governor according to claim 1, 2 or 3, characterized in that: The distance between the spring shaft seat and the safety valve of the safety valve assembly is 2.8 mm.

5. The propeller speed governor according to claim 4, characterized in that: The upper end of the spring shaft seat of the safety valve assembly is pressed against the inner hole of the cap I through the gasket I, and the lower end is pressed onto the pressure spring through the gasket II.

6. The propeller speed governor according to claim 5, characterized in that: One end of the baffle of the baffle support assembly of the power turbine adjustment assembly is rotatably mounted in a mounting shell protruding from the lower end side wall of the upper shell assembly. The structure is: the bearing gap is assembled at the root of the support shaft of the support seat, the baffle gap is assembled on the bearing, and a spring IV is mounted on the support shaft through a gasket; the support seat, bearing and spring IV are pressed as a whole into the inner hole of the mounting shell.

7. The propeller speed governor according to claim 1, 2 or 3, characterized in that: The upper end of the spring shaft seat of the safety valve assembly is pressed against the inner hole of the cap I through the gasket I, and the lower end is pressed onto the pressure spring through the gasket II.

8. The propeller speed governor according to claim 7, characterized in that: One end of the baffle of the baffle support assembly of the power turbine adjustment assembly is rotatably mounted in a mounting shell protruding from the lower end side wall of the upper shell assembly. The structure is: the bearing gap is assembled at the root of the support shaft of the support seat, the baffle gap is assembled on the bearing, and a spring IV is mounted on the support shaft through a gasket; the support seat, bearing and spring IV are pressed as a whole into the inner hole of the mounting shell.

9. The propeller speed governor according to claim 1, 2 or 3, characterized in that: One end of the baffle of the baffle support assembly of the power turbine adjustment assembly is rotatably mounted in a mounting shell protruding from the lower end side wall of the upper shell assembly. The structure is: the bearing gap is assembled at the root of the support shaft of the support seat, the baffle gap is assembled on the bearing, and a spring IV is mounted on the support shaft through a gasket; the support seat, bearing and spring IV are pressed as a whole into the inner hole of the mounting shell.

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