Propeller variable pitch limiting system

Abstract

The invention relates to a propeller variable pitch limiting system, which belongs to the technical field of aircrafts and comprises a speed regulator, a shaft sleeve and a beta pipe, a mounting hole is formed in a shell of the speed regulator, and a large-pitch oil hole and a small-pitch oil hole are formed in the side wall of the shell of the speed regulator; the shaft sleeve is fixed in the mounting hole in a penetrating manner, a large-distance transfer hole and a small-distance transfer hole are formed in the shaft sleeve, and three closed rings are fixed in the shaft sleeve in a penetrating manner; the beta pipe penetrates through the three closed rings in a sealed and sliding mode, and small-distance oil inlet and outlet holes and large-distance oil inlet and outlet holes are formed in the pipe wall of the beta pipe at intervals. The large-distance oil hole, the large-distance transfer hole, the large-distance oil supply area and the large-distance oil inlet and outlet hole are communicated in sequence, then the small-distance oil hole, the small-distance transfer hole, the small-distance oil supply area and the small-distance oil inlet and outlet hole are communicated in sequence, when the large-distance oil inlet and outlet hole supplies oil, the small-distance oil inlet and outlet hole is used for returning oil, and when the small-distance oil inlet and outlet hole supplies oil, the small-distance oil inlet and outlet hole is used for returning oil. Large-distance oil inlet and outlet holes are used for oil return, large-distance and small-distance changes of the propeller are achieved, the structure of a distance changing system is simplified, and reliability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft, and in particular to a propeller pitch limiting system. Background Art

[0002] The propeller is the power mechanism of the aircraft. The control of its speed during movement requires a propeller speed controller that matches its interface. Usually, the propeller speed controller of the aircraft propeller realizes oil circuit switching through the coordination of complex electromagnets and valves / shaft sleeves for blade angle limit control, and then through the complex pitch mechanism inside the propeller, it can ensure that the propeller blade angle will not reach too small an angle in the air to generate negative tension. Such a complex mechanism not only leads to high production costs, but also inevitably causes a decrease in overall reliability.

[0003] Therefore, how to design a propeller pitch limiting system with simple structure, high reliability and strong pitch controllability is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0004] The invention provides a propeller pitch-changing limiting system, which solves the technical problems that the existing propeller pitch-changing device has a complex structure, high cost and poor stability.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a propeller pitch limiting system, comprising: a speed governor, a shaft sleeve and a beta tube,

[0006] The housing of the speed regulator is provided with mounting holes that pass through both ends, and the side walls of the housing are provided with large-pitch oil holes and small-pitch oil holes at intervals, the large-pitch oil holes and the small-pitch oil holes are both connected to the mounting holes and are both connected to the high-pressure lubricating oil supply chamber of the speed regulator; the sleeve is fixed in the mounting hole and is provided with a large-pitch transit hole and a small-pitch transit hole, the large-pitch transit hole is connected to the large-pitch oil hole, and the small-pitch transit hole is connected to the small-pitch oil hole, and the sleeve is respectively provided with closed rings between and on both sides of the large-pitch transit hole and the small-pitch transit hole, so as to define a small-pitch oil supply area and a small-pitch oil supply area connected to the small-pitch transit hole between two adjacent closed rings. A large-pitch oil supply area connected to the large-pitch transit hole; the beta tube is sealingly slidably penetrated on the three closed rings and one end of the beta tube is movably passed through the shaft sleeve and fixed on the propeller, the inner hole of the beta tube is connected to the variable pitch oil chamber of the propeller and the other end is a closed end, and small-pitch oil inlet and outlet holes and large-pitch oil inlet and outlet holes are arranged on the tube wall of the beta tube at intervals, the small-pitch oil inlet and outlet holes are connected to the small-pitch oil supply area, and the large-pitch oil inlet and outlet holes are connected to the large-pitch oil supply area, so that when the large-pitch oil inlet and outlet holes are supplied with oil, the small-pitch oil inlet and outlet holes are used to return oil, or when the small-pitch oil inlet and outlet holes are supplied with oil, the large-pitch oil inlet and outlet holes are used to return oil, so as to realize the variable pitch of the propeller.

[0007] The beneficial effects of the present invention are as follows: the traditional propeller pitch change structure is changed, and the large-pitch oil hole on the housing of the speed regulator, the large-pitch transfer hole on the shaft sleeve, the large-pitch oil supply area and the large-pitch oil inlet and outlet holes on the beta tube are first connected in sequence, and then the small-pitch oil hole on the housing of the speed regulator, the small-pitch transfer hole on the shaft sleeve, the small-pitch oil supply area and the small-pitch oil inlet and outlet holes on the beta tube are connected in sequence. Since the beta tube is fixed on the propeller (the beta tube changes pitch synchronously with the propeller) and its inner hole is connected to the pitch change oil chamber of the propeller, and since the high-pressure lubricating oil supply chamber of the speed regulator can distribute high-pressure lubricating oil, when the large-pitch inlet and outlet oil holes are used to supply oil, the small-pitch inlet and outlet oil holes can be used to return oil to achieve large-pitch change of the propeller, and when the small-pitch inlet and outlet oil holes are used to supply oil, the large-pitch inlet and outlet oil holes can be used to return oil to achieve small-pitch change of the propeller, thereby simplifying the structure of the propeller pitch change system, reducing the preparation cost of the propeller pitch change system, and improving the reliability of the propeller pitch change system.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the small-pitch oil hole, the small-pitch transfer hole and the small-pitch oil inlet and outlet holes are all arranged in a direction close to the propeller, and the closed ring close to the propeller can close the small-pitch oil inlet and outlet holes to position and limit the propeller from continuing to change pitch.

[0010] A further beneficial effect of adopting the above method is that the small-pitch oil holes, the small-pitch transfer holes and the small-pitch oil inlet and outlet holes are all arranged in a direction close to the propeller. After the beta tube slides a certain distance in the direction of the propeller, a closed ring close to the propeller is used to close the small-pitch oil inlet and outlet holes, thereby limiting the propeller from continuing to change pitch at small pitch, thereby achieving limited motion of the propeller at small pitch.

[0011] Furthermore, the large-pitch oil holes, the large-pitch transfer holes, the large-pitch oil inlet and outlet holes, the small-pitch oil holes, the small-pitch transfer holes and the small-pitch oil inlet and outlet holes are all two holes arranged opposite to each other.

[0012] Furthermore, it also includes a plurality of sealing rings, the outer peripheral side wall of the sleeve is provided with sealing grooves at intervals, the plurality of sealing rings are respectively sleeved in the plurality of sealing grooves and the outer peripheral side surfaces thereof are in contact with the hole wall sealant of the mounting hole.

[0013] A further beneficial effect of the above method is that the gap between the housing and the shaft sleeve is sealed by the sealing ring, so that the sealing between the housing and the shaft sleeve can be improved, and the leakage of high-pressure lubricating oil through the gap between the housing and the shaft sleeve can be avoided.

[0014] Furthermore, it also includes a positioning ring, and an annular positioning groove is provided on the inner hole wall of the mounting hole; the positioning ring is fixed on the outer peripheral side wall of the shaft sleeve and extends into the positioning groove.

[0015] A further beneficial effect of the above method is that the positioning ring fixed on the outer peripheral side wall of the sleeve is extended into the positioning groove, which can facilitate the positioning and installation of the sleeve and improve the sealing between the housing and the sleeve.

[0016] Furthermore, the diameters of the large-pitch oil holes, the large-pitch transfer holes and the large-pitch oil inlet and outlet holes are all 20 to 30 mm.

[0017] Furthermore, the diameters of the small-pitch oil holes, the small-pitch transfer holes, and the small-pitch oil inlet and outlet holes are all 5 to 15 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic diagram of the internal structure of a propeller pitch limiting system of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Shell, 11. Mounting hole, 12. Large-pitch oil hole, 13. Small-pitch oil hole, 2. Bushing, 21. Bushing, 22. Small-pitch transfer hole, 3. Beta tube, 31. Large-pitch oil inlet and outlet holes, 32. Small-pitch oil inlet and outlet holes, 4. Closing ring, 5. Sealing ring, 6. Positioning ring. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] like Figure 1 As shown, a propeller pitch limiting system includes: a speed governor, a shaft sleeve 2 and a beta tube 3.

[0023] The housing 1 of the speed regulator is provided with a mounting hole 11 with two ends passing through, and the side wall of the housing 1 is provided with a large-pitch oil hole 12 and a small-pitch oil hole 13, both of which are connected to the high-pressure lubricating oil supply chamber of the speed regulator; the shaft sleeve 2 is fixed in the mounting hole 11 and is provided with a large-pitch transfer hole 21 connected to the large-pitch oil hole 12 and a small-pitch transfer hole 22 connected to the small-pitch oil hole 13, and the shaft sleeve 2 is respectively provided with a closed ring 4 between the large-pitch transfer hole 21 and the small-pitch transfer hole 22 and on both sides, so as to define a small-pitch oil supply area and a small-pitch oil supply area connected to the small-pitch transfer hole 22 respectively between two adjacent closed rings 4. A large-pitch oil supply area connected to the large-pitch transit hole 21; the beta tube 3 is sealed and slides in the three closed rings 4 and one end of it movably passes through the shaft sleeve 2 and is fixed on the propeller, its inner hole is connected to the variable pitch oil chamber of the propeller, and its other end is a closed end, and large-pitch oil inlet and outlet holes 31 and small-pitch oil inlet and outlet holes 32 are arranged on its tube wall at intervals, the large-pitch oil inlet and outlet holes 31 are connected to the large-pitch oil supply area, and the small-pitch oil inlet and outlet holes 32 are connected to the small-pitch oil supply area, so that when the large-pitch oil inlet and outlet holes 31 are supplying oil, the small-pitch oil inlet and outlet holes 32 are used to return oil, or when the small-pitch oil inlet and outlet holes 32 are supplying oil, the large-pitch oil inlet and outlet holes 31 are used to return oil, so as to realize the variable pitch of the propeller.

[0024] In some specific embodiments, the small-pitch oil hole 13, the small-pitch transfer hole 22 and the small-pitch oil inlet and outlet holes 32 are all arranged in a direction close to the propeller, and the closed ring 4 close to the propeller can close the small-pitch oil inlet and outlet holes 32 to position and limit the propeller from continuing to change pitch.

[0025] In some specific embodiments, the large-pitch oil holes 12 , the large-pitch transfer holes 21 , the large-pitch oil inlet and outlet holes 31 , the small-pitch oil holes 13 , the small-pitch transfer holes 22 and the small-pitch oil inlet and outlet holes 32 can all be two holes arranged opposite to each other.

[0026] In some specific embodiments, multiple sealing rings 5 ​​may be included. The outer peripheral side wall of the sleeve 2 is provided with sealing grooves at intervals. The multiple sealing rings 5 ​​are respectively sleeved in the multiple sealing grooves and their outer peripheral side surfaces are in contact with the hole wall sealant of the mounting hole 11.

[0027] In some specific embodiments, a positioning ring 6 may be further included. An annular positioning groove is provided on the inner wall of the mounting hole 11 ; the positioning ring 6 is sleeved on the outer peripheral side wall of the shaft sleeve 2 and extends into the positioning groove.

[0028] Specifically, the diameters of the large-pitch oil holes 12, the large-pitch transfer holes 21, and the large-pitch oil inlet and outlet holes 31 may all be 20-30 mm.

[0029] Specifically, the diameters of the small-pitch oil holes 13, the small-pitch transfer holes 22, and the small-pitch oil inlet and outlet holes 32 may all be 5 to 15 mm.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A propeller pitch limiting system, characterized in that: include: A speed governor, wherein a housing (1) of the speed governor is provided with a mounting hole (11) with two ends extending therethrough, and a side wall of the housing (1) is provided with a large-pitch oil hole (12) and a small-pitch oil hole (13), wherein both the large-pitch oil hole (12) and the small-pitch oil hole (13) are connected to a high-pressure lubricating oil supply chamber of the speed governor; A shaft sleeve (2), the shaft sleeve (2) is inserted into the mounting hole (11) and is provided with a large-pitch transfer hole (21) communicating with the large-pitch oil hole (12) and a small-pitch transfer hole (22) communicating with the small-pitch oil hole (13); the shaft sleeve (2) is provided with a closed ring (4) between and on both sides of the large-pitch transfer hole (21) and the small-pitch transfer hole (22), so as to define a small-pitch oil supply area communicating with the small-pitch transfer hole (22) and a large-pitch oil supply area communicating with the large-pitch transfer hole (21) between two adjacent closed rings (4); A beta tube (3), wherein the beta tube (3) is sealed and slides in the three closed rings (4) and one end of the beta tube (3) is movably passed through the shaft sleeve (2) and fixed on the propeller, wherein the inner hole of the beta tube (3) is connected to the pitch oil chamber of the propeller, and the other end of the beta tube (3) is a closed end. A large pitch oil inlet and outlet hole (31) and a small pitch oil inlet and outlet hole (32) are arranged on the tube wall at intervals, wherein the large pitch oil inlet and outlet hole (31) is connected to the large pitch oil supply area, and the small pitch oil inlet and outlet hole (32) is connected to the small pitch oil supply area, so that when the large pitch oil inlet and outlet hole (31) supplies oil, the small pitch oil inlet and outlet hole (32) is used to return oil, or when the small pitch oil inlet and outlet hole (32) is used to supply oil, the large pitch oil inlet and outlet hole (31) is used to return oil, so as to achieve the pitch change of the propeller.

2. A propeller pitch limiting system according to claim 1, characterized in that: The small-pitch oil hole (13), the small-pitch transfer hole (22) and the small-pitch oil inlet and outlet hole (32) are all arranged in a direction close to the propeller, and the closed ring (4) close to the propeller can close the small-pitch oil inlet and outlet hole (32) to position and limit the propeller from continuing to change pitch.

3. A propeller pitch limiting system according to claim 1, characterized in that: The large-pitch oil hole (12), the large-pitch transfer hole (21), the large-pitch oil inlet and outlet hole (31), the small-pitch oil hole (13), the small-pitch transfer hole (22) and the small-pitch oil inlet and outlet hole (32) are all two holes arranged opposite to each other.

4. A propeller pitch limiting system according to claim 1, characterized in that: It also includes a plurality of sealing rings (5), the outer peripheral side wall of the shaft sleeve (2) is provided with sealing grooves at intervals, the plurality of sealing rings (5) are respectively sleeved in the plurality of sealing grooves and the outer peripheral side surfaces thereof are in contact with the hole wall sealant of the mounting hole (11).

5. A propeller pitch limiting system according to claim 1, characterized in that: It also includes a positioning ring (6), and an annular positioning groove is provided on the inner hole wall of the mounting hole (11); the positioning ring (6) is sleeved on the outer peripheral side wall of the shaft sleeve (2) and extends into the positioning groove.

6. A propeller pitch limiting system according to claim 1, characterized in that: The diameters of the large-spacing oil holes (12), the large-spacing transfer holes (21) and the large-spacing oil inlet and outlet holes (31) are all 20 to 30 mm.

7. A propeller pitch limiting system according to claim 1, characterized in that: The diameters of the small-pitch oil holes (13), the small-pitch transfer holes (22) and the small-pitch oil inlet and outlet holes (32) are all 5 to 15 mm.

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