阅读说明：本技术 一种电液伺服恒速变距螺旋桨机构 (Electro-hydraulic servo constant-speed variable-pitch propeller mechanism ) 是由 史立 洪俊 潘新旗 于 2021-02-26 设计创作，主要内容包括：本发明提出了一种电液伺服恒速变距螺旋桨机构,包括整流罩组件、桨毂总成和多个桨叶；桨毂总成包括桨毂壳体和变距机构,桨毂壳体安装在整流罩组件内,桨毂壳体两侧分别安装有前液压缸、后液压缸；变距机构包括前活塞、后活塞、变距块、电动双向油泵,变距块滑动安装在桨毂壳体内,前活塞、后活塞分别滑动安装在前液压缸、后液压缸内并且前活塞、后活塞均与变距块连接,电动双向油泵安装在变距块内并与前液压缸、后液压缸连接；多个桨叶周向分布且桨叶穿过整流罩组件与桨毂壳体转动连接,桨叶的变距销与变距块连接。本发明对螺旋桨的变距控制精度高,响应速度快,驱动力大,损耗功率小,安全性能高,适用范围广。(The invention provides an electro-hydraulic servo constant-speed variable-pitch propeller mechanism, which comprises a fairing assembly, a propeller hub assembly and a plurality of blades; the propeller hub assembly comprises a propeller hub shell and a variable pitch mechanism, the propeller hub shell is arranged in the fairing assembly, and a front hydraulic cylinder and a rear hydraulic cylinder are respectively arranged on two sides of the propeller hub shell; the pitch-variable mechanism comprises a front piston, a rear piston, a pitch-variable block and an electric two-way oil pump, the pitch-variable block is slidably mounted in the propeller hub shell, the front piston and the rear piston are respectively slidably mounted in the front hydraulic cylinder and the rear hydraulic cylinder, the front piston and the rear piston are both connected with the pitch-variable block, and the electric two-way oil pump is mounted in the pitch-variable block and is connected with the front hydraulic cylinder and the rear hydraulic cylinder; the plurality of blades are distributed in the circumferential direction, penetrate through the fairing assembly and are connected with the hub shell in a rotating mode, and the variable pitch pins of the blades are connected with the variable pitch block. The invention has the advantages of high control precision of the variable pitch of the propeller, high response speed, large driving force, small power loss, high safety performance and wide application range.)

1. An electro-hydraulic servo constant-speed variable-pitch propeller mechanism is characterized by comprising a fairing assembly, a propeller hub assembly and a plurality of blades (6); wherein:

the propeller hub assembly comprises a propeller hub shell (2) and a variable pitch mechanism, wherein the propeller hub shell (2) is arranged in the fairing component, and a front hydraulic cylinder (8) and a rear hydraulic cylinder (9) are respectively arranged on two sides of the propeller hub shell (2); the pitch-variable mechanism comprises a front piston (3), a rear piston (4), a pitch-variable block (7) and an electric two-way oil pump (5), the pitch-variable block (7) is slidably mounted in the hub shell (2), the front piston (3) and the rear piston (4) are respectively slidably mounted in a front hydraulic cylinder (8) and a rear hydraulic cylinder (9), the front piston (3) and the rear piston (4) are both connected with the pitch-variable block (7), and the electric two-way oil pump (5) is mounted in the pitch-variable block (7) and is connected with the front hydraulic cylinder (8) and the rear hydraulic cylinder (9);

the plurality of blades (6) are distributed in the circumferential direction, the blades (6) penetrate through the fairing assembly to be connected with the hub shell (2) in a rotating mode, and the variable-pitch pins (10) of the blades (6) are connected with the variable-pitch block (7).

2. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism is characterized in that a front ring groove is formed in the periphery of a front piston (3), a first sealing ring (11) is installed in the front ring groove, and a second sealing ring (12) is installed at the connecting position of the front piston (3) and a variable-pitch block (7).

3. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism is characterized in that a rear ring groove is formed in the periphery of the rear piston (4), a third sealing ring (13) is installed in the rear ring groove, and a fourth sealing ring (14) is installed at the connecting position of the rear piston (4) and the variable-pitch block (7).

4. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to any one of claims 1-3, wherein a plurality of sliding limiting grooves (15) are circumferentially arranged on the pitch changing block (7), the sliding limiting grooves (15) are respectively arranged in one-to-one correspondence with the blades (6), a filling block (16) and a variable-pitch sliding block (17) are clamped in the sliding limiting grooves (15), and a pitch changing pin (10) of each blade (6) is inserted in a limiting hole (18) of the variable-pitch sliding block (17).

5. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to any one of claims 1-3, wherein the electric bidirectional oil pump (5) is connected with a front oil pipe (19), the front oil pipe (19) penetrates through the front piston (3) to be communicated with the front hydraulic cylinder (8), and the front oil pipe (19) is fixedly connected with the front piston (3).

6. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to any one of claims 1-3, wherein the electric bidirectional oil pump (5) is connected with a rear oil pipe (20), the rear oil pipe (20) penetrates through the rear piston (4) to be communicated with the rear hydraulic cylinder (9), and the rear oil pipe (20) is fixedly connected with the rear piston (4).

7. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to any one of claims 1 to 3, wherein the fairing assembly comprises a fairing (1) and a bottom plate (23), one end of the fairing (1) is open, the bottom plate (23) is installed at the opening position of the fairing (1) through a bolt, the hub shell (2) is installed on the bottom plate (23) through a bolt, the front hydraulic cylinder (8) is connected with the hub shell (2) through a bolt, and the rear hydraulic cylinder (9) is integrally formed with the hub shell (2).

8. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to claim 7, wherein a plurality of through holes (21) are formed in the outer circumference of the fairing (1), and the plurality of blades (6) are connected with the hub shell (2) through blade bearings (22) after respectively penetrating through the plurality of through holes (21).

9. The electro-hydraulic servo constant-speed variable-pitch propeller mechanism according to any one of claims 1-3, wherein a through center hole (24) is formed in the variable-pitch block (7), the electric bidirectional oil pump (5) is arranged in the center hole (24), and the electric bidirectional oil pump (5) is fixed with the variable-pitch block (7) in a gluing mode.

Technical Field

The invention relates to the technical field of propellers, in particular to an electro-hydraulic servo constant-speed variable-pitch propeller mechanism.

Background

The constant-speed variable-pitch propeller is designed to rotate at a designated speed and vary the pitch, the rotating speed of an engine is not changed, the control of thrust is realized by changing the pitch, and high propeller efficiency can be obtained under the conditions of different flight states and power regulation.

The constant-speed variable-pitch propellers used at present comprise a hydraulic variable-pitch propeller and an electric variable-pitch propeller. However, the blade rotating mechanism of the hydraulic variable pitch propeller is driven by the pressure of engine oil, the movement of the oil is regulated by a centrifugal regulator, the mechanism is complex, and once the oil leaks, the engine can be stopped in the air. The blade rotation of the electric variable pitch propeller is driven by a motor, the starting of the motor is controlled by a digital regulator, the control precision is high, but the motor is limited by the driving power and the weight of the motor, and the electric variable pitch propeller is only suitable for small propellers. How to solve the above problems is a technical problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides an electro-hydraulic servo constant-speed variable-pitch propeller mechanism.

The invention provides an electro-hydraulic servo constant-speed variable-pitch propeller mechanism which comprises a fairing assembly, a propeller hub assembly and a plurality of blades; wherein:

the propeller hub assembly comprises a propeller hub shell and a variable pitch mechanism, the propeller hub shell is arranged in the fairing assembly, and a front hydraulic cylinder and a rear hydraulic cylinder are respectively arranged on two sides of the propeller hub shell; the pitch-variable mechanism comprises a front piston, a rear piston, a pitch-variable block and an electric two-way oil pump, the pitch-variable block is slidably mounted in the propeller hub shell, the front piston and the rear piston are respectively slidably mounted in the front hydraulic cylinder and the rear hydraulic cylinder, the front piston and the rear piston are both connected with the pitch-variable block, and the electric two-way oil pump is mounted in the pitch-variable block and is connected with the front hydraulic cylinder and the rear hydraulic cylinder;

the plurality of blades are distributed in the circumferential direction, penetrate through the fairing assembly and are connected with the hub shell in a rotating mode, and the variable pitch pins of the blades are connected with the variable pitch block.

Preferably, the periphery of the front piston is provided with a front ring groove, a first sealing ring is installed in the front ring groove, and a second sealing ring is assembled at the connecting position of the front piston and the variable pitch block.

Preferably, the periphery of the rear piston is provided with a rear ring groove, a third sealing ring is installed in the rear ring groove, and a fourth sealing ring is assembled at the connecting position of the rear piston and the variable pitch block.

Preferably, a plurality of sliding limiting grooves are circumferentially formed in the variable-pitch block, the sliding limiting grooves are respectively arranged in one-to-one correspondence with the plurality of blades, the filling block and the variable-pitch sliding block are connected in the sliding limiting grooves in a clamping mode, and the variable-pitch pins of the blades are connected in limiting holes of the variable-pitch sliding block in an inserting mode.

Preferably, the electric two-way oil pump is connected with a front oil pipe, the front oil pipe penetrates through the front piston to be communicated with the front hydraulic cylinder, and the front oil pipe is fixedly connected with the front piston.

Preferably, the electric bidirectional oil pump is connected with a rear oil pipe, the rear oil pipe penetrates through the rear piston to be communicated with the rear hydraulic cylinder, and the rear oil pipe is fixedly connected with the rear piston.

Preferably, the fairing assembly comprises a fairing and a bottom plate, wherein one end of the fairing is open, the bottom plate is installed at the opening position of the fairing through a bolt, the hub shell is installed on the bottom plate through a bolt, the front hydraulic cylinder is connected with the hub shell through a bolt, and the rear hydraulic cylinder and the hub shell are integrally processed and formed.

Preferably, a plurality of through holes are formed in the circumferential direction of the outer portion of the fairing, and a plurality of blades penetrate through the through holes respectively and then are connected with the hub shell through blade bearings.

Preferably, the variable pitch block is provided with a through center hole, the electric two-way oil pump is arranged in the center hole, and the electric two-way oil pump is fixed with the variable pitch block in a glued joint manner.

According to the electro-hydraulic servo constant-speed variable-pitch propeller mechanism, the electric two-way oil pump is driven by the low-power direct-current motor, the two-way movement of the variable-pitch mechanism is realized by the oil pumping pressure of the electric two-way oil pump, the variable-pitch block drives the blade variable-pitch pin to drive the blades to rotate along the blade shaft, the control of the rotating torque of the propeller is realized by changing the pitch, and higher propeller efficiency can be obtained under the conditions of different flight states and power regulation. The motor is controlled by the digital propeller regulator, the variable pitch control precision of the propeller is high, the response speed is high, the safety performance is high, the power loss is low, the driving force is large, and the application range is wide.

Drawings

FIG. 1 is a schematic structural diagram of an electro-hydraulic servo constant-speed variable-pitch propeller mechanism provided by the invention;

fig. 2 is an exploded view of an electro-hydraulic servo constant-speed variable-pitch propeller mechanism provided by the invention.

Detailed Description

Referring to fig. 1 and 2, the invention provides an electro-hydraulic servo constant-speed variable-pitch propeller mechanism, which comprises a fairing assembly, a propeller hub assembly and a plurality of blades 6; wherein:

the fairing assembly comprises a fairing 1 and a bottom plate 23, wherein one end of the fairing 1 is open, the bottom plate 23 is mounted at the opening position of the fairing 1 through a bolt, and a plurality of through holes 21 are formed in the peripheral direction outside the fairing 1.

The hub assembly comprises a hub shell 2 and a pitch mechanism. The propeller hub shell 2 is arranged in the fairing 1 and is installed on the bottom plate 23 through bolts, a front hydraulic cylinder 8 and a rear hydraulic cylinder 9 are respectively installed on two sides of the propeller hub shell 2, the front hydraulic cylinder 8 is connected with the propeller hub shell 2 through bolts, and the rear hydraulic cylinder 9 and the propeller hub shell 1 are integrally processed and molded. The pitch-changing mechanism comprises a front piston 3, a rear piston 4, a pitch-changing block 7 and an electric bidirectional oil pump 5; the variable-pitch block 7 is slidably mounted in the propeller hub shell 2, a plurality of sliding limiting grooves 15 are circumferentially arranged on the variable-pitch block 7, the plurality of sliding limiting grooves 15 are respectively arranged in one-to-one correspondence with the plurality of blades 6, and a filling block 16 and a variable-pitch sliding block 17 are clamped in the sliding limiting grooves 15; the front piston 3 and the rear piston 4 are respectively installed in the front hydraulic cylinder 8 and the rear hydraulic cylinder 9 in a sliding mode, the front piston 3 and the rear piston 4 are both connected with the variable pitch block 7, and the electric bidirectional oil pump 5 is installed in the variable pitch block 7 and is connected with the front hydraulic cylinder 8 and the rear hydraulic cylinder 9.

The plurality of blades 6 respectively pass through the plurality of through holes 21 and then are rotatably connected with the hub shell 2 through blade bearings 22, and the pitch pins 10 of the blades 6 are inserted in the limiting holes 18 of the pitch slide blocks 17.

The invention drives the electric two-way oil pump 5 by the low-power direct current motor, realizes the two-way movement of the variable-pitch mechanism by the oil pumping pressure of the electric two-way oil pump 5, drives the blades 6 to rotate along the blade shaft by the variable-pitch block, realizes the control of the rotating torque of the propeller by changing the blade pitch, and can obtain higher propeller efficiency under the conditions of different flight states and power regulation. Specifically, the method comprises the following steps: when the electric two-way oil pump 5 works to supply oil to the front hydraulic cylinder 8, the oil is output to the front hydraulic cylinder 8 from the rear hydraulic cylinder 9, and hydraulic oil with certain pressure enters the front hydraulic cylinder 8 to push the pitch-variable mechanism to move, so that the blades 6 are driven to rotate along the blade shaft, and the blade pitch is changed; when the electric bidirectional oil pump 5 works to supply oil to the rear hydraulic cylinder 9, the oil is output to the rear hydraulic cylinder 9 from the front hydraulic cylinder 8, and hydraulic oil with certain pressure can push the pitch-changing mechanism to move when entering the rear hydraulic cylinder 9, so that the blades 6 are driven to rotate along the blade shafts at a constant speed and change the pitch.

In this embodiment, in order to improve the assembly sealing performance, a front ring groove is formed in the periphery of the front piston 3, a first sealing ring 11 is installed in the front ring groove, and a second sealing ring 12 is installed at the connection position of the front piston 3 and the distance-changing block 7. The periphery of the rear piston 4 is provided with a rear ring groove, a third sealing ring 13 is arranged in the rear ring groove, and a fourth sealing ring 14 is assembled at the connecting position of the rear piston 4 and the variable pitch block 7.

In the specific embodiment, the electric two-way oil pump 5 is connected with a front oil pipe 19, the front oil pipe 19 penetrates through the front piston 3 to be communicated with the front hydraulic cylinder 8, and the front oil pipe 19 is fixedly connected with the front piston 3. The electric two-way oil pump 5 is connected with a rear oil pipe 20, the rear oil pipe 20 penetrates through the rear piston 4 to be communicated with the rear hydraulic cylinder 9, and the rear oil pipe 20 is fixedly connected with the rear piston 4.

In the specific embodiment, the pitch block 7 is provided with a through center hole 24, the electric two-way oil pump 5 is arranged in the center hole 24, and the electric two-way oil pump 5 is fixedly bonded with the pitch block 7.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.