A power turbine regulating assembly for a propeller governor

Abstract

The present invention discloses a power turbine regulating assembly for a propeller governor. The rod fork assembly includes a counterweight, springs I and II, a fork, a small wheel, and a rod. One end of the fork is fixed with a counterweight, and the other end is a U-shaped fork. The fork is hinged on the rod. The small wheel is placed in the U-shaped groove of the fork, and a pin fitted in its inner hole with a clearance is fixed on the U-shaped end wall. The nozzle is fixed in the mounting hole extending from the lower side wall of the governor housing. The baffle support assembly includes a baffle and a spring III fixed on the side wall of the baffle. In the normal state, one side wall of the baffle closes the nozzle, and the small wheel abuts against the other side wall of the baffle. The U-shaped groove at the lower end of the rod 11 is inserted into the reset handle assembly. When the valve core and valve cap rise or the reset handle assembly acts, the counterweight presses down the baffle of the baffle support assembly to open the nozzle for jetting air. The present invention has a propeller overspeed protection function and also has auxiliary functions of β control and reverse pitch.

Description

Technical Field

[0001] The present invention relates to a power turbine regulating assembly for a propeller governor. Background Art

[0002] Existing propeller governors do not have a propeller overspeed protection function. When the propeller overspeed reaches a certain value, especially during the process from the forward pitch to the reverse pitch, the propeller is very likely to rotate at high speed, resulting in an aircraft accident. In order to ensure the safe use of the aircraft and prevent the propeller from rotating at high speed, a maximum speed limiting mechanism is provided in the propeller control system. Some of the speed limiting mechanisms are included in the engine or the propeller itself. Sometimes, due to the limited space structure of the engine and the propeller, or due to the requirement of functional modularization, the speed limiting function is separated and designed as an independent product. Whether the existing speed limiters are electronically controlled or hydraulic, their structures are simple, the speed limiting speeds are single, and the response is slow. Especially in the reverse pitch state, the required working speed of the propeller is lower than that in the forward pitch state. If the propeller overspeed at this time, since the speed limiter cannot reach the speed limiting working point, the speed limiter cannot respond in time. Once a failure occurs, it cannot prevent the propeller from overspeeding in time, resulting in an aircraft accident. In order to make the use of the aircraft safer and more reliable, it is urgent to add a more reliable overspeed protection function. Summary of the Invention

[0003] The object of the present invention is to solve the above problems existing in the prior art, and provide a power turbine regulating assembly for a propeller governor. The governor equipped with this regulating assembly has a propeller overspeed protection function and has auxiliary functions of β control and reverse pitch.

[0004] To achieve the above object, the technical solution of the present invention is: a power turbine regulating assembly of a propeller governor, including a rod fork assembly, a baffle support assembly, a plug and a nozzle installed in a governor housing; the rod fork assembly includes a counterweight, springs I and II, a fork, a small wheel and a rod; one end of the fork is fixed with a counterweight, and the other end is a U-shaped fork matching the housing cavity of the spool valve cap assembly, and pins are fixed at both ends of the U-shaped fork; during use, the lower end of the pin abuts against the upper end wall of the valve cap of the spool valve cap assembly; one end of the fork close to the counterweight passes through the through hole of the rod, and it is hinged to the rod through a needle bearing press-fitted in its inner hole and pins press-fitted at both ends on the opposite walls of the through hole of the rod; the lower end of the fork placed in the through hole of the rod is U-shaped, the small wheel is placed in the U-shaped groove of the fork, and a stud pin with clearance fit in its inner hole is fixed on the U-shaped end wall; a spring II is fixed on the upper end surface of the rod, and a U-shaped groove connecting the reset handle assembly is provided on its lower end surface, and a spring I is fixed on the upper end surface of the fork; the nozzle is fixed in the mounting hole protruding from the lower side wall of the governor housing, and a plug is provided at the outer end of the nozzle; the baffle support assembly includes a baffle and a spring III fixed on the side wall of the baffle, one end of the baffle is rotatably installed in the mounting shell protruding from the lower side wall of the governor housing, the other end abuts against the lower end of the counterweight, and in the normal state, one side wall of the baffle closes the nozzle, and the small wheel abuts against the other side wall of the baffle; the U-shaped groove at the lower end of the rod is inserted into the reset handle assembly; when the spool valve cap rises or the reset handle assembly acts, the counterweight presses down the baffle of the baffle support assembly to open the nozzle for jetting, by reducing the pressure on one side in the signal conversion device, sending a signal to the fuel regulator to reduce the fuel supply to the engine, so that the engine power drops, and the propeller speed also drops to the required range to prevent the propeller from overspeeding. When β is manipulated and reverse pitch is applied, the reset handle acts, the rod moves downward, the counterweight presses down the baffle of the baffle support assembly to open the nozzle, by reducing the pressure on one side in the signal conversion device, sending a signal to the fuel regulator to reduce the fuel supply to the engine, so that the engine power drops, the propeller under-speed condition occurs, and the propeller moves in the reverse pitch direction.

[0005] Further preferably, the structure that one end of the baffle of the baffle support assembly is rotatably installed in the mounting shell protruding from the lower side wall of the governor housing is: the bearing has clearance fit at the root of the support shaft of the support seat, the baffle has clearance fit on the bearing, and a spring IV is sleeved on the support shaft through a gasket; the support seat, the bearing and the spring IV are integrally press-fitted into the inner hole of the mounting shell.

[0006] When the governor of the present invention is installed, when the governor overspeed reaches a certain value, the power turbine regulating assembly comes into play, the spool valve cap assembly is lifted to a certain extent, pushing the fork to rotate, the counterweight presses down the baffle of the baffle support assembly to open the nozzle, by reducing the pressure on one side in the signal conversion device, sending a signal to the fuel regulator to reduce the fuel supply to the engine, so that the engine power drops, and the propeller speed also drops to the required range to prevent the propeller from overspeeding. When β is manipulated and reverse pitch is applied, the reset handle acts, the rod moves downward, the counterweight presses down the baffle of the baffle support assembly to open the nozzle, by reducing the pressure on one side in the signal conversion device, sending a signal to the fuel regulator to reduce the fuel supply to the engine, so that the engine power drops, the propeller under-speed condition occurs, and the propeller moves in the reverse pitch direction.

[0007] The installation of the present invention enables the governor itself to have the function of protecting the propeller from overspeed, making the operation of the propeller more reliable and the use of the aircraft safer and more reliable. Moreover, the present invention also has the auxiliary functions of β control and reverse pitch. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a top view of the installation structure of the present invention;

[0009] Figure 2 is Figure 1 the AA sectional view of

[0010] Figure 3 is a schematic structural view of the strut fork assembly in the present invention;

[0011] Figure 4 is the front view of the baffle support assembly in the present invention;

[0012] Figure 5 is the bottom view of the baffle support assembly in the present invention;

[0013] Figure 6 is Figure 1 the BB sectional view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0015] As Figures 1 to 6As shown in the figure, this embodiment includes a rod fork assembly, a baffle support assembly, a plug 2, and a nozzle 5 installed in a governor housing 23. The rod fork assembly includes a counterweight 16, springs I 19 and II 18, a fork 20, a small wheel 13, and a rod 11. One end of the fork 20 is fixed with a counterweight 16 by an elastic cylindrical pin 15, and the other end is a U-shaped fork matching the cavity of the housing 23 for installing a spool valve cap assembly. The two ends of the U-shaped fork are respectively fixed with pins 21. During use, the lower end of the pin 21 abuts against the upper end wall of the valve cap of the spool valve cap assembly. One end of the fork 20 close to the counterweight 16 passes through a through-hole of the rod 11, and it is hinged to the rod 11 through a needle roller bearing 14 press-fitted in its inner hole and pins 17 press-fitted at both ends on the opposite walls of the through-hole of the rod 11. The lower end of the fork 20 placed in the through-hole of the rod 11 is U-shaped, and the small wheel 13 is placed in the U-shaped groove of the fork 20, and a dowel pin 12 with a clearance fit in its inner hole is fixed on the U-shaped end wall. A spring II 18 is fixed on the upper end surface of the rod 11, and a U-shaped groove 22 for connecting a reset handle assembly is provided on its lower end surface. A spring I 19 is fixed on the upper end surface of the fork 20. The nozzle 5 is fixed in an installation hole protruding from the lower side wall of the governor housing 23, and a plug 2 is provided at the outer end of the nozzle 5. The baffle support assembly includes a baffle 6 and a spring III 4 fixed on the side wall of the baffle. One end of the baffle 6 is rotatably installed in an installation shell protruding from the lower side wall of the governor housing 23, and the other end abuts against the lower end of the counterweight 16. And in the normal state, one side wall of the baffle 6 closes the nozzle 5, and the small wheel 13 abuts against the other side wall of the baffle 6. The U-shaped groove at the lower end of the rod 11 is inserted into the reset handle assembly. When the spool valve cap rises, the counterweight 16 presses down the baffle 6 of the baffle support assembly to open the nozzle 5 for jetting. Preferably, the structure that one end of the baffle 6 of the baffle support assembly is rotatably installed in an installation shell protruding from the lower side wall of the governor housing 23 is: a bearing 8 has a clearance fit at the root of the support shaft of the support seat 7, the baffle 6 has a clearance fit on the bearing 8, and a spring IV 10 is sleeved on the support shaft through a gasket 9. The support seat, the bearing 8, and the spring IV 10 are integrally press-fitted into the inner hole of the installation shell. 1 and 3 are both sealing rings.

[0016] Of course, the present invention has many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all belong to the improvements of equivalent technologies and fall within the protection scope of the claims of the present invention.

Claims

1. A power turbine regulating assembly for a propeller governor, characterized in that: It includes a rod fork assembly, a baffle support assembly, a plug and a nozzle installed in the governor housing; the rod fork assembly includes a counterweight, springs I and II, a fork, a small wheel and a rod; one end of the fork is fixed with a counterweight, and the other end is a U-shaped fork matching the housing cavity of the valve core valve cap assembly. Pins are fixed at both ends of the U-shaped fork; during use, the lower end of the pin abuts against the upper end wall of the valve cap of the valve core valve cap assembly; one end of the fork close to the counterweight passes through the through hole of the rod, and it is hinged to the rod through a needle bearing press-fitted in its inner hole and pins press-fitted at both ends on the opposite walls of the through hole of the rod; the lower end of the fork placed in the through hole of the rod is U-shaped, and the small wheel is placed in the U-shaped groove of the fork, and a stud press-fitted in its inner hole is fixed on the U-shaped end wall; a spring II is fixed on the upper end surface of the rod, and a U-shaped groove connecting the reset handle assembly is provided on its lower end surface; a spring I is fixed on the upper end surface of the fork; the nozzle is fixed in the mounting hole protruding from the lower side wall of the governor housing, and there is a plug at the outer end of the nozzle; the baffle support assembly includes a baffle and a spring III fixed on the side wall of the baffle. One end of the baffle is rotatably installed in the mounting shell protruding from the lower side wall of the governor housing, and the other end abuts against the lower end of the counterweight. And in the normal state, one side wall of the baffle closes the nozzle, and the small wheel abuts against the other side wall of the baffle; the U-shaped groove at the lower end of the rod is inserted into the reset handle assembly; when the valve core valve cap rises or the reset handle assembly acts, the counterweight presses down the baffle of the baffle support assembly to open the nozzle for jetting. The structure that one end of the baffle of the baffle support assembly is rotatably installed in the mounting shell protruding from the lower side wall of the governor housing is: the bearing is installed with a clearance in the root of the support shaft of the support seat, the baffle is press-fitted on the bearing, and a spring IV is sleeved on the support shaft through a gasket; the support seat, the bearing and the spring IV are integrally press-fitted into the inner hole of the mounting shell.

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