CN109488463B

CN109488463B - Centrifugal counterweight mechanism for fluid pipeline

Info

Publication number: CN109488463B
Application number: CN201811392642.5A
Authority: CN
Inventors: 赵继平
Original assignee: AECC Aero Engine Xian Power Control Technology Co Ltd
Current assignee: AECC Aero Engine Xian Power Control Technology Co Ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2021-03-26
Anticipated expiration: 2038-11-21
Also published as: CN109488463A

Abstract

The invention relates to a centrifugal counterweight mechanism for a fluid pipeline, which comprises a hollow rotating shaft, a counterweight block, a spring and an outer cover. The invention obviously improves the sensitivity of the flyweight, makes up the influence of the severe change of the liquid on the liquid flow, avoids the adjustment error caused by the difference of the flyweight and the buoyancy when the external condition changes, and realizes the accurate control of the liquid flow.

Description

Centrifugal counterweight mechanism for fluid pipeline

Technical Field

The invention relates to the field of aircraft engine fuel systems, in particular to a centrifugal counterweight mechanism for a fluid pipeline, which is used for an aircraft engine fuel system.

Background

The centrifugal flyweights of the prior art are converted into displacements of the guide rods or the valves by sensing the engine speed, and then sent to a subsequent amplifying element or other computing device. In order to ensure that the control process is shortened and the number of oscillations is reduced in the case of stable operation of the controlled element, this is achieved by increasing the damping of the centrifugal flyweight in the oil, which however affects the sensitivity of the centrifugal flyweight.

Disclosure of Invention

The purpose of the invention is as follows: in order to realize the stable operation of the system and the short adjusting process, the influence of the liquid inertia on the sensitivity of the centrifugal flyweight is reduced, and meanwhile, the influence of the change of the fuel density on the fuel mass flow is compensated by using the buoyancy effect of the flyweight in the fuel.

The technical scheme of the invention is as follows: a centrifugal counterweight mechanism for a fluid pipeline comprises a hollow rotating shaft 1, a counterweight block 2, a spring 3, an outer cover 4 and a mandril 5;

the counterweight block 2 is an L-shaped structural member, the L-shaped counterweight block 2 is rotatably arranged on the wall surface of the hollow rotating shaft 1, the short arm of the L-shaped structural member penetrates through the wall surface of the hollow shaft 1 and extends into the hollow rotating shaft 1, the long arm of the L-shaped structural member is positioned outside the wall surface of the hollow shaft 1, the spring 3 is arranged between the hollow shaft 1 and the counterweight block 2, and pretightening force is applied to the counterweight block 2, so that the long arm of the L-shaped structural member is leaned against the hollow shaft 1; the dustcoat 4 is fixed in hollow shaft 1 outside, and dustcoat 4 encloses the city space with hollow shaft 1 wall for balancing weight 2 is located outward in the space, the space is opened and is filled the liquid hole.

The centrifugal counterweight mechanism is arranged in a fluid pipeline, and fluid in the fluid pipeline flows into the outer cover 4 through the liquid filling hole, so that the counterweight block 2 is immersed in the fluid; when the hollow shaft 1 is rotating, the counterweight 2 can overcome the pretightening force of the spring 3 to rotate through the centrifugal action, and at the moment, the movement of the counterweight 2 cannot be influenced by the fluid in the fluid pipeline under the blocking action of the outer cover 4.

When the balancing weight 2 rotates, the liquid has viscosity, and the balancing weight 2 rotates in a relatively closed oil cavity (in the space of the outer cover 4), so that the relative movement speed of the balancing weight 2 and the liquid is reduced, the influence on axial displacement when the rotating speed changes is reduced, and the influence of the liquid on the sensitivity of the balancing weight 2 is reduced.

When the counter weight structure is rotatory, liquid is rotatory along with balancing weight 2 in the dustcoat 4, liquid is along with the radius along radial direction in the dustcoat 4 big more, pressure is big more, this centrifugal balancing weight 2 receives balancing weight 2 in, the hydraulic pressure effect in the outside, make balancing weight 2 receive the hydraulic pressure force at directional center, 2 size and rotational speed are fixed time at balancing weight, when balancing weight 2 turned angle grow, the hydraulic pressure force (buoyancy) that balancing weight 2 received also grow, this power will influence balancing weight 2 to the compression of spring 3, revise 2 axial displacement's of balancing weight output, thereby revise the change of ejector pin 5 or valve aperture, come the compensation because of 2 changes in position of balancing weight to the influence of liquid mass flow.

Preferably, the number of the balancing weights 2 is at least three, and the balancing weights are circumferentially and uniformly distributed around the hollow shaft 1.

Preferably, an external gear is fixed at one end of the hollow shaft 1 as an input end.

Preferably, the opening direction of the liquid filling hole is consistent with the movement direction of the fluid.

Preferably, the spring 3 is a torsion spring or a coil spring.

The invention has the beneficial effects that: according to the invention, the sensitivity of the counterweight 2 is obviously improved, the influence of the position change of the counterweight 2 on the liquid flow is compensated, the adjustment error caused by the difference of the flying weight and the buoyancy when the external condition is changed is avoided, and the accurate control of the liquid flow is realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a hollow shaft;

FIG. 3 is a cross-sectional view of the housing;

FIG. 4 is a side view of the housing;

wherein, 1-hollow rotating shaft, 2-balancing weight, 3-spring, 4-outer cover, 5-top rod, 6-fluid pipeline.

Detailed Description

Referring to fig. 1-3, a centrifugal counterweight mechanism for fluid pipeline comprises a hollow rotating shaft 1, a counterweight block 2, a spring 3, an outer cover 4 and a mandril 5;

the counterweight block is an L-shaped structural part, the L-shaped counterweight block 2 is rotatably arranged on the wall surface of the hollow rotating shaft 1, the short arm of the L-shaped structural part penetrates through the wall surface of the hollow shaft 1 and extends into the hollow rotating shaft 1, the long arm of the L-shaped structural part is positioned outside the wall surface of the hollow shaft 1, the spring 3 is arranged between the hollow shaft 1 and the counterweight block and applies pretightening force to the counterweight block 2, so that the long arm of the L-shaped structural part is leaned against the hollow shaft 1; the outer cover 4 is fixed outside the hollow shaft 1, and the outer cover 4 and the wall surface of the hollow shaft 1 enclose a space, so that the counterweight block 2 is positioned in the space outside, and the space is provided with a liquid filling hole; the number of the balancing weights 2 is at least three, and the balancing weights are uniformly distributed around the hollow shaft 1 in the circumferential direction; the opening direction of the liquid filling hole is consistent with the movement direction of the fluid.

Claims

1. A centrifugal counterweight mechanism for a fluid pipeline comprises a hollow rotating shaft, a counterweight block, a spring and an outer cover;

the counterweight block is an L-shaped structural part, the L-shaped structural part is rotatably arranged on the wall surface of the hollow rotating shaft, the short arm of the L-shaped structural part penetrates through the wall surface of the hollow rotating shaft and extends into the hollow rotating shaft, the long arm of the L-shaped structural part is positioned outside the wall surface of the hollow rotating shaft, the spring is arranged between the hollow rotating shaft and the counterweight block and applies pretightening force to the counterweight block, so that the long arm of the L-shaped structural part is leaned against the hollow rotating shaft; the dustcoat is fixed in hollow pivot outside, dustcoat and hollow pivot wall enclose the city space for the balancing weight is located outward in the space, the space is opened and is filled the liquid hole.

2. A flyweight mechanism for fluid lines as recited in claim 1, wherein: the balancing weight be at least three, and around hollow rotating shaft hoop evenly distributed.

3. A flyweight mechanism for fluid lines as recited in claim 1, wherein: and an external gear is fixed at one end of the hollow rotating shaft and serves as an input end.

4. A flyweight mechanism for fluid lines as recited in claim 1, wherein: the opening direction of the liquid filling hole is consistent with the movement direction of the fluid.

5. A flyweight mechanism for fluid lines as recited in claim 1, wherein: the spring is a torsion spring or a spiral spring.