CN115783245A

CN115783245A - Hydraulic fixed-distance stop device for airplane propeller

Info

Publication number: CN115783245A
Application number: CN202310047772.XA
Authority: CN
Inventors: 李俊; 周欣荣; 邵骁勇; 肖卫华; 王经纬; 王吉军
Original assignee: Jiangsu Xinyang New Material Co ltd
Current assignee: Guizhou Air New Technology Development Industry Co ltd
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2023-03-14
Anticipated expiration: 2043-01-31
Also published as: CN115783245B

Abstract

The invention discloses a hydraulic fixed-distance stop device of an airplane propeller in the technical field of propeller airplanes, which comprises: the first stop assembly comprises a valve arranged in the lubricating oil pipe, a valve shell, a valve bushing, an oil pipe, a plunger, a shunt valve and a spring assembly, wherein the valve shell, the valve bushing and the oil pipe are arranged in the lubricating oil pipe, the plunger, the shunt valve and the spring assembly are axially movably arranged in the valve bushing, the plunger is connected with the shunt valve, a distance oil cavity capable of controlling the plunger and the shunt valve to act is arranged between the valve bushing and the plunger, two sides of the valve shell are communicated through a central channel and are communicated with a large distance oil cavity, the valve is axially movably arranged in the channel, and the spring assembly is arranged in the plunger and is used for controlling the plunger to move backwards and driving the valve to move backwards after the oil pressure of the distance oil cavity is reduced.

Description

Hydraulic fixed-distance stop device for airplane propeller

Technical Field

The invention relates to the technical field of propeller aircrafts, in particular to a propeller fixed-distance stopping device.

Background

After the propeller aircraft breaks down in the flight process to cause the propeller to stop rotating, the propeller continuously reduces the distance to increase the flight resistance or reverse, so that the safety of the aircraft is seriously influenced, and therefore a mechanism needs to be designed, and the propeller angle can be locked at any angle in a limited range after the propeller aircraft breaks down, so that hazardous accidents are avoided; the prior art discloses a short-distance limiting mechanism for a slow-speed vehicle state propeller, and the disclosure number is as follows: CN 112429202a, published as: 2021.03.02, which is not reliable enough.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a hydraulic fixed-distance stop device for an airplane propeller, which can lock the propeller angle at any angle within a limited range when the airplane propeller breaks down, and greatly improves the safety and reliability of the airplane with the propeller during flying.

The purpose of the invention is realized as follows: an aircraft propeller hydraulic distance-fixing stopping device, comprising:

the piston assembly comprises a lubricating oil pipe and a piston which are arranged in an oil cylinder, the piston is movably sleeved on the periphery of the lubricating oil pipe, the piston controls the propeller to adjust the pitch angle by moving back and forth in the oil cylinder, a large-distance oil cavity is arranged at the front end of the piston in the oil cylinder, and the large-distance oil cavity is communicated with the lubricating oil pipe;

first locking subassembly, including setting up valve, valve casing, valve bush, defeated oil pipe, plunger, reposition of redundant personnel valve and the spring unit in the lubricating oil pipe, valve casing, valve bush, defeated oil pipe axial fixity are intraductal in the lubricating oil, but plunger, reposition of redundant personnel valve, spring unit axial displacement's setting are in the valve bush, the plunger links together with reposition of redundant personnel valve, be equipped with the distance oil pocket of steerable plunger, reposition of redundant personnel valve action between valve bush and the plunger, the both sides of valve casing through the passageway intercommunication at center and with long-distance oil pocket intercommunication, but valve axial displacement's setting is in the passageway, the spring unit sets up in the plunger, is used for controlling the plunger to remove backward and drive the valve rearward movement after the distance oil pressure reduces.

As a preferred technical scheme of the hydraulic fixed-distance stop device for the airplane propeller, the spring assembly comprises a first spring and a second spring, the first spring is sleeved outside the second spring and used for controlling the plunger to move backwards, the second spring is used for controlling the valve to move backwards, and a movable gap is reserved between the rear end of the valve and the plunger.

As a preferred technical solution of the hydraulic fixed-distance stopping device for an aircraft propeller according to the present invention, the hydraulic fixed-distance stopping device further includes:

the second stop assembly comprises an inner sleeve which is axially fixed on the piston, a thread surface is machined on the periphery of the inner sleeve, the stop sleeve is connected onto the thread surface, and a mechanical distance lock is further mounted on the piston and used for limiting the rotation of the inner sleeve.

As a preferable technical scheme of the hydraulic spacing stop device for the airplane propeller, the mechanical spacing lock comprises a spring seat capable of moving along the axial direction of a piston, a third spring is arranged at the front end of the spring seat and used for pushing the spring seat to move backwards, a relatively closed locking oil cavity is formed between the rear end of the spring seat and the piston and communicated with the spacing oil cavity, a locking disc is fixed on the periphery of the spring seat, and corresponding tooth surfaces are processed on the end surface of the locking disc and the end surface of an inner sleeve.

As a preferable technical solution of the hydraulic fixed-distance stop device for the airplane propeller, an outer sleeve is arranged on the periphery of the stop sleeve, and the outer sleeve is mounted on the piston.

As a preferable technical scheme of the hydraulic distance-fixing stopping device for the airplane propeller, a plurality of groove holes are formed in the front end of the spring seat along the circumferential direction, the third spring is arranged in the groove holes, the end part of the piston is provided with an end cover, one end of the third spring abuts against the groove holes, and the other end of the third spring abuts against the end cover.

In a preferred embodiment of the hydraulic fixed-distance stopping device for the aircraft propeller, the inner side of the inner sleeve is rotatably supported on the outer periphery of the piston through a ball bearing.

As a preferred technical scheme of the hydraulic distance-fixing stopping device for the airplane propeller, the distance-fixing oil cavity is formed in the periphery of the splitter valve extending into the valve bush.

As an optimal technical scheme of the hydraulic fixed-distance stopping device for the airplane propeller, a plurality of oil through holes are radially formed in the front section of the lubricating oil pipe, which is positioned in the large-distance oil cavity.

As a preferred technical scheme of the hydraulic fixed-distance stopping device for the airplane propeller, a blocking nut is arranged at the front end of the oil sliding pipe.

Compared with the prior art, the invention has the beneficial effects that:

the invention has relatively simple structure and principle, is convenient to assemble, and can safely and reliably lock the propeller pitch and ensure the propeller to be fixed at a fixed distance safely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a cross-sectional view of the present invention.

FIG. 2 is a cross-sectional view of a first stop assembly of the present invention.

FIG. 3 is a cross-sectional view of a second stop assembly of the present invention.

Fig. 4 is a view showing an opened state of the shutter according to the present invention.

Fig. 5 is a view showing a state in which the shutter is closed according to the present invention.

The oil cylinder structure comprises a 100 piston assembly, a 101 oil cylinder, a 102 oil pipe, a 102a oil through hole, a 103 piston, a 200 first stop assembly, a 201 valve, a 201a screw head, a 202 valve shell, a 203 valve bush, a 204 oil delivery pipe, a 205 plunger, a 205a sleeve, a 205B boss, a 206 shunt valve, a 207 spring assembly, a 207a first spring, a 207B second spring, a 208 blocking nut, a 300 second stop assembly, a 301 inner sleeve, a 301a tooth surface, a 302 stop sleeve, a 303 mechanical distance lock, a 303a spring seat, a 303B third spring, a 303C locking disc, a 303D tooth surface, a 303e end cover, a 304 outer sleeve, a 305, a 400 adjusting piece, a 500 propeller, an A large distance oil cavity, a B oil return cavity, a C distance oil cavity and a D locking oil cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

1-5 an aircraft propeller hydraulic distance stop device comprising:

the piston assembly 100 comprises a lubricating oil pipe 102 and a piston 103 which are arranged in an oil cylinder 101, the piston 103 is movably sleeved on the periphery of the lubricating oil pipe 102, the piston 103 controls the propeller 500 to adjust the pitch angle by moving back and forth in the oil cylinder 101, the front end of the piston 103 in the oil cylinder 101 is a large-distance oil cavity A, and the large-distance oil cavity A is communicated with the lubricating oil pipe 102;

the first stop assembly 200 comprises a valve 201 arranged in a sliding oil pipe 102, a valve shell 202, a valve bush 203, an oil pipeline 204, a plunger 205, a shunt valve 206, a spring assembly 207 and a blocking nut 208, wherein the valve shell 202, the valve bush 203 and the oil pipeline 204 are axially fixed in the sliding oil pipe 102, the blocking nut 208 is arranged at the front end of the sliding oil pipe 102, the plunger 205, the shunt valve 206 and the spring assembly 207 are axially movably arranged in the valve bush 203, the plunger 205 is connected with the shunt valve 206, a distance oil cavity C capable of controlling the plunger 205 and the shunt valve 206 to act is arranged between the valve bush 203 and the plunger 205, two sides of the valve shell 202 are communicated through a central channel and are communicated with a large distance oil cavity A, the valve 201 is axially movably arranged in the channel, and the spring assembly 207 is arranged in the plunger 205 and is used for controlling the plunger 205 to move backwards and driving the valve to move backwards after the oil pressure of the distance oil cavity C is reduced.

Specifically, the piston 103 is sleeved on the front section of the oil sliding pipe 102, the adjusting piece 400 for adjusting the rotation of the propeller 500 is sleeved on the rear end of the oil sliding pipe 102 (the prior art is adopted in which the piston 103 drives the propeller 500 to rotate through the adjusting piece 400, and redundant description is omitted), and the adjusting piece 400 is connected with the piston 103; the valve shell 202, the valve bush 203 and the oil delivery pipe 204 are pressed and fixed in the oil sliding pipe 102 from the front end under the action of the blocking nut 208, the front end of the valve shell 202 abuts against the blocking nut 208, the rear end of the valve shell 202 abuts against the front end of the valve bush 203, the rear end of the valve bush 203 is inserted into the oil delivery pipe 204, and the valve bush 203 is provided with an oil hole communicated with the oil delivery pipe 204 and communicated with the oil cavity C with a certain distance; the rear end of the plunger 205 is movably connected with the front end of the shunt valve 206, the rear end of the shunt valve 206 is inserted into the valve bush 203, the distance oil chamber C is arranged on the periphery of the shunt valve 206 extending into the valve bush 203, the front end of the plunger 205 is processed into a sleeve 205a structure, the spring assembly 207 is arranged in the sleeve 205a, the spring assembly 207 abuts between the plunger 205 and the valve shell 202, and the plunger 205 is connected with the valve 201.

It should be noted that, in a normal working state, the rear end cavity of the piston 103 is an oil return cavity B, the long-distance oil cavity a is communicated with the oil return cavity B through a passage in the center of the valve housing 202, and the forward and backward movement of the piston 103 is controlled by adjusting the oil pressure in the long-distance oil cavity a, so that when the piston 103 moves forward, the pitch becomes small, and when the piston 103 moves backward, the pitch becomes large; in this state, the oil chamber C is full of oil, and under the action of oil pressure, the shunt valve 206 is ejected to the front end position, and the plunger 205 is also at the front end position, so that the valve 201 is ejected to the open position, and the oil passage is kept open; when a fault occurs, in order to prevent the piston 103 from moving forwards and changing to a small distance, hydraulic oil needs to be locked in the large-distance oil cavity A, at the moment, the oil pressure in the fixed-distance oil cavity C is controlled to be reduced, under the action of the spring assembly 207, the spring assembly 207 pushes the plunger 205 to drive the shunt valve 206 to be at the rear end position, meanwhile, the valve 201 is driven to move rightwards to be at the closing position to close a channel in the center of the valve shell 202, at the moment, the oil in the large-distance oil cavity A is locked to limit the forward movement of the piston 103, the propeller 500 is prevented from changing to a small distance, and the reliability of the propeller 500 is guaranteed.

Further, the spring assembly 207 includes a first spring 207a and a second spring 207b, the first spring 207a is sleeved outside the second spring 207b, the first spring 207a is used for controlling the plunger 205 to move backwards, the second spring 207b is used for controlling the shutter 201 to move backwards, and a moving gap (as can be seen in fig. 5) is left between the rear end of the shutter 201 and the plunger 205.

Specifically, a boss 205b is machined in a sleeve 205a at the front end of the plunger 205, the rear end of the first spring 207a is sleeved on the boss 205b and abuts against the bottom of the sleeve 205a, and the front end of the first spring 207a abuts against the rear end of the shutter housing 202; a through hole is formed in the center of the shutter housing 202, the shaft portion of the shutter 201 is disposed in the through hole, a screw head 201a is connected to the rear end of the shutter 201, a movable gap (as can be seen in fig. 5) is left between the screw head 201a and the boss 205b, the rear end of the second spring 207b abuts against the screw head 201a, and the front end of the second spring 207b abuts against the shutter housing 202.

It should be noted that, in a normal operating state, under the action of oil pressure in the distance oil chamber C, the boss 205b of the plunger 205 moves forward, and after contacting the screw head 201a, pushes the shutter 201 to move forward to make it in an open state; during failure, the oil pressure in the distance oil chamber C is reduced, and under the action of the first spring 207a and the second spring 207b, the valve 201 and the plunger 205 move rightwards at the same time, so that the valve 201 can be closed timely, the valve 201 does not move rightwards any more after the valve 201 is closed, and the plunger 205 continues to move rightwards to a right limit position, so that a gap between the screw head 201a and the boss 205b is maintained; the design is to prevent the oil pressure in the oil chamber C from rising and the plunger 205 from immediately triggering the valve 201 to open after the fault is eliminated, so that the valve 201 can be opened after the oil pressure in the oil chamber C to be determined is stable, and the working stability and reliability of the invention are further improved.

Further, this embodiment further includes:

the second stopping assembly 300 comprises an inner sleeve 301 axially fixed on the piston 103, a thread surface is processed on the outer periphery of the inner sleeve 301, a stopping sleeve 302 is connected on the thread surface, and a mechanical distance lock 303 is further installed on the piston 103 and used for limiting the rotation of the inner sleeve 301.

Specifically, the inner sleeve 301 is rotatably sleeved on the piston 103, and the stop sleeve 302 is screwed on the outer periphery of the inner sleeve 301.

It should be noted that, in actual operation, in order to prevent the first stopper assembly 200 from malfunctioning or failing, the second stopper assembly 300 is designed to perform secondary protection, so as to achieve double insurance, when the piston 103 in the propeller 500 malfunctions moves forward, the stopper sleeve 302 will move forward along with the piston 103, the front end of the stopper sleeve 302 will first collide against the inner wall of the cylinder 101, but due to the threaded connection relationship between the stopper sleeve 302 and the inner sleeve 301, the inner sleeve 301 will continue to move forward by a rotating manner, and the piston 103 will also move forward, at this time, if it is necessary to limit the forward movement of the piston 103, only the mechanical distance lock 303 needs to be controlled to lock the inner sleeve 301 to limit the rotation thereof, so as to limit the piston 103 to continue to move forward, thereby playing a protective role.

Further, the mechanical distance lock 303 comprises a spring seat 303a capable of moving along the axial direction of the piston 103, a third spring 303b is arranged at the front end of the spring seat 303a, the third spring 303b is used for pushing the spring seat 303a to move backwards, a relatively closed locking oil cavity D is formed between the rear end of the spring seat 303a and the piston 103, the locking oil cavity D is communicated with the distance oil cavity C, a locking disc 303C is fixed on the periphery of the spring seat 303a, a tooth surface 303D is processed on the end surface of the locking disc 303C, and a corresponding tooth surface 301a is processed on the end surface of the inner sleeve 301.

Specifically, a plurality of step surfaces are machined on the front end surface of the piston 103, the inner sleeve 301 and the spring seat 303a are correspondingly installed, and a sealing ring is arranged on the inner circumference and the outer circumference of the spring seat 303a, so that a relatively closed locking oil cavity D is formed between the rear end of the spring seat 303a and the piston 103.

It should be noted that, since the locking oil chamber D is communicated with the distance oil chamber C, in a normal operating state, the locking plate 303C is located at the front end position, and at this time, the locking plate 303C cannot be locked by the inner sleeve 301, when a fault occurs, the oil pressure in the distance oil chamber C is reduced, and at the same time, the oil pressure in the locking oil chamber D is reduced, and under the action of the third spring 303b, the spring seat 303a moves to the rear end, so that the locking plate 303C is driven to contact with the end surface of the inner sleeve 301, and locking is achieved.

Further, an outer sleeve 304 is provided on the outer periphery of the stopper sleeve 302, and the outer sleeve 304 is attached to the piston 103.

Specifically, the outer sleeve 304 is connected to the end face of the piston 103 by a stud.

It should be noted that the outer sleeve 304 is designed to enhance the stability of the movement of the stop sleeve 302 and thus the stability of the secondary stop assembly 300.

Further, a plurality of groove holes are formed in the front end of the spring seat 303a along the circumferential direction, the third spring 303b is arranged in the groove holes, an end cover 303e is arranged at the end of the piston 103, one end of the third spring 303b abuts against the groove holes, and the other end of the third spring 303b abuts against the end cover 303 e.

It should be noted that the design enhances the reliability of the motion process of the spring seat 303a, and further enhances the stability of the locking disk 303c, thereby enhancing the stability of the second stop assembly 300.

Further, the inner sleeve 301 is rotatably supported on the outer periphery of the piston 103 via a ball bearing 305 on the inner side.

It should be noted that this is designed to ensure the rotation and support of the inner sleeve 301.

Further, a plurality of oil through holes 102a are radially opened at a front section of the oil tube 102 located in the large oil chamber a.

It should be noted that the design can ensure the normal operation of the oil path.

According to the invention, by means of synchronous action of the double insurance (the first stop assembly 200 and the second stop assembly 300), the propeller pitch 500 can be locked in time after a fault, and the propeller 500 is ensured to be fixed in distance and safe.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An aircraft propeller hydraulic distance-fixing stopping device, comprising:

the piston assembly (100) comprises a lubricating oil pipe (102) and a piston (103) which are arranged in an oil cylinder (101), wherein the piston (103) is movably sleeved on the periphery of the lubricating oil pipe (102), the piston (103) controls a propeller (500) to adjust the pitch angle by moving back and forth in the oil cylinder (101), a large-distance oil cavity (A) is arranged at the front end of the piston (103) in the oil cylinder (101), the large-distance oil cavity (A) is communicated with the lubricating oil pipe (102),

it is characterized by also comprising:

first stop subassembly (200), including setting up valve (201), valve casing (202), valve bush (203), defeated oil pipe (204), plunger (205), reposition of redundant personnel valve (206) and spring assembly (207) in oil pipe (102), valve casing (202), valve bush (203), defeated oil pipe (204) axial fixity are in oil pipe (102), but setting of plunger (205), reposition of redundant personnel valve (206), spring assembly (207) axial displacement is in valve bush (203), plunger (205) link together with reposition of redundant personnel valve (206), be equipped with the distance oil pocket (C) of steerable plunger (205), reposition of redundant personnel valve (206) action between valve bush (203) and plunger (205), the both sides of valve casing (202) communicate through the passageway at center and communicate with macro-oil pocket (A), but setting of valve (201) axial displacement is in the passageway, spring assembly (207) set up in plunger (205) for control plunger (205) move and drive valve (201) backward after the distance oil pressure reduction.

2. The aircraft propeller hydraulic spacing stop device according to claim 1, wherein the spring assembly (207) comprises a first spring (207 a) and a second spring (207 b), the first spring (207 a) is sleeved outside the second spring (207 b), the first spring (207 a) is used for controlling the plunger (205) to move backwards, the second spring (207 b) is used for controlling the valve (201) to move backwards, and a movable gap is reserved between the rear end of the valve (201) and the plunger (205).

3. An aircraft propeller hydraulic distance-fixing device as defined in claim 1 or 2, further comprising:

the second stop assembly (300) comprises an inner sleeve (301) axially fixed on the piston (103), a thread surface is machined on the periphery of the inner sleeve (301), a stop sleeve (302) is connected onto the thread surface, a mechanical distance lock (303) is further mounted on the piston (103), and the mechanical distance lock (303) is used for limiting the rotation of the inner sleeve (301).

4. The aircraft propeller hydraulic spacing stop device according to claim 3, wherein the mechanical spacing lock (303) comprises a spring seat (303 a) capable of moving axially along the piston (103), a third spring (303 b) is arranged at the front end of the spring seat (303 a), the third spring (303 b) is used for pushing the spring seat (303 a) to move backwards, a relatively closed locking oil cavity (D) is formed between the rear end of the spring seat (303 a) and the piston (103), the locking oil cavity (D) is communicated with the spacing oil cavity (C), a locking disc (303C) is fixed on the periphery of the spring seat (303 a), and corresponding tooth surfaces (303D, 301 a) are machined on the end surface of the locking disc (303C) and the end surface of the inner sleeve (301).

5. Hydraulic distance-fixing device for an aircraft propeller according to claim 3, characterized in that the outer circumference of the fixing sleeve (302) is provided with an outer sleeve (304), the outer sleeve (304) being mounted on the piston (103).

6. The hydraulic distance-fixing stopping device for the propeller of the airplane as claimed in claim 3, wherein a plurality of slots are formed in the front end of the spring seat (303 a) along the circumferential direction, the third spring (303 b) is arranged in the slot, an end cover (303 e) is arranged at the end part of the piston (103), one end of the third spring (303 b) abuts against the slot, and the other end of the third spring abuts against the end cover (303 e).

7. Hydraulic distance-fixing device for aircraft propellers according to claim 3, characterised in that the inner side of the inner sleeve (301) is rotatably supported on the outer circumference of the piston (103) by means of ball bearings (305).

8. Hydraulic distance-fixing device for an aircraft propeller according to claim 1 or 2, characterized in that the distance-fixing oil chamber (C) opens at the periphery of the diverter flap (206) that protrudes into the flap bushing (203).

9. The hydraulic fixed-distance stopping device for the propeller of the airplane as claimed in claim 1 or 2, wherein a plurality of oil through holes (102 a) are radially formed at the front section of the oil slide pipe (102) positioned in the large-distance oil cavity (A).

10. Hydraulic distance-fixing device for aircraft propellers according to claim 1 or 2, characterized in that the front end of the slide oil tube (102) is provided with a blocking nut (208).