CN112196932A

Movatterモバイル変換

Info

Publication number: CN112196932A
Application number: CN202011028759.2A
Authority: CN
Inventors: 汪兰明; 杜进; 焦阳; 张松
Original assignee: China Helicopter Research and Development Institute
Current assignee: China Helicopter Research and Development Institute
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-01-08
Anticipated expiration: 2040-09-25
Also published as: CN112196932B

Abstract

The invention belongs to the technical field of structural design of helicopters, and discloses a throttle valve for a buffer, which comprises: valve pin, valve seat, valve barrel, big spring, valve cover, little spring, outer retaining ring and interior retaining ring. The valve seat is of an H-shaped tubular structure, a group of oil holes are distributed in an annular mode at the position, close to the side wall, of the middle partition plate, a small hole is formed in the center of the middle partition plate, and a circle of annular holes are formed in the side wall of the upper cavity of the valve seat; a group of valve pins are arranged in the holes at the upper part of the valve seat; the valve sleeve is provided with an annular groove on the middle side wall of the inner circle, 1 group of oil holes are arranged in the middle of the groove, the inner circle of the valve sleeve is assembled on the excircle of the middle upper part of the valve seat, the large spring is assembled on the excircle of the lower part of the valve seat, the upper part of the large spring is attached to the lower end face of the valve sleeve, the outer retaining ring is assembled on the lower part of the valve seat, the upper end face of the outer retaining ring is in contact with the lower end face of the large spring, the large spring is compressed, the valve cover is inversely assembled in the lower cavity of the. The throttle valve is suitable for buffers with different landing speed requirements.

Description

Throttle valve for buffer

Technical Field

The invention belongs to the technical field of structural design of helicopters, and particularly relates to a throttle valve for a buffer.

Background

A throttling valve for a buffer is used for an undercarriage buffer, and the requirement that the buffer is suitable for different landing speeds can be met by adjusting the size of a damping hole according to the oil pressure in the buffer.

The defects of the background art are as follows:

the existing throttle valve for the buffer usually adopts a fixed oil hole or an oil needle structure, is usually suitable for the design of the buffer with constant landing speed, has larger landing speed span (more than 0.5 m/s-12.8 m/s) for helicopters, particularly crash-resistant undercarriages, adopts the multi-stage buffers in series to meet the requirements of normal landing and crash resistance, and has more complex structure and higher weight cost.

Disclosure of Invention

The purpose of the invention is as follows: a throttle valve for a buffer is provided which is adaptable to different landing speed requirements.

The technical scheme of the invention is as follows:

a throttle valve for a damper, comprising: the valve comprises a valve pin, a valve seat, a valve sleeve, a large spring, a valve cover, a small spring, an outer retainer ring and an inner retainer ring;

the valve seat is of an H-shaped tubular structure and is divided into an upper cavity and a lower cavity by a central partition plate; a circle of annular first oil holes are axially formed in the periphery of the central partition plate close to the side wall;

the upper end of the valve seat is connected with the upper end of a buffer piston rod;

the outer side wall of the upper end of the valve seat is provided with a ring-shaped boss; the annular boss is provided with a group of first through holes along the axial direction;

the valve pins are of T-shaped cylindrical structures, and a group of valve pins are arranged in the first through hole from top to bottom;

the valve sleeve is of a tubular structure and is sleeved on the outer side wall of the upper cavity of the valve seat;

the outer retainer ring is of a tubular structure and is sleeved at the bottom of the valve seat;

the large spring is sleeved on the outer side wall of the valve seat and between the valve sleeve and the outer retainer ring;

the valve cover is of a U-shaped annular structure and is inversely assembled in the lower cavity of the valve seat;

the small retainer ring is of a tubular structure and is arranged at the bottom end inside the lower cavity of the valve seat,

the small spring is arranged between the small retainer ring and the bottom of the valve cover.

Furthermore, a circle of second oil holes are formed in the side wall of the upper cavity of the valve seat along the radial direction.

Furthermore, a circle of annular groove is formed in the inner side wall of the valve sleeve; and a circle of third oil holes matched with the second oil holes are radially arranged in the annular groove. The valve sleeve is mainly used for increasing the area of the damping hole and reducing the damping force after the valve sleeve moves downwards under the action of oil pressure through the valve pin and the compression spring moves downwards.

Further, a second through hole is formed in the center of the central partition plate of the valve seat, and the area of the second through hole is not more than 30% of the total area of the circle of the first oil holes. The buffer has the main effects that the buffer is used as a rebound fixed oil hole, provides larger damping for the rebound of the buffer, and prevents the buffer from having the phenomenon of higher rebound speed.

Furthermore, a third through hole is formed in the center of the bottom of the valve cover, and the diameter of the third through hole is smaller than the difference value between the diameter of a circle formed by the circle centers of the circle of the annular first oil holes and the diameter of the first oil holes.

Further, the diameter of the third through hole is larger than that of the second through hole. When guaranteeing that third oilhole and second oilhole coincide, fluid can pass through the second oilhole completely.

Further, an annular flange edge is arranged on the outer side wall of the upper end of the valve sleeve; the upper end face of the annular flange is in contact with the lower end face of the annular boss of the valve seat, and the upper end face of the annular flange is also in contact with the bottom end face of the valve pin.

Furthermore, the side wall of the lower end of the valve seat is provided with a pin along the radial direction for fixing the outer retainer ring and the inner retainer ring.

The invention has the beneficial effects that:

the invention has simple and compact structure, can meet the damping requirements of the buffer at different landing speeds, can improve the buffering performance of the buffer and reduce the structural complexity of the buffer.

Drawings

FIG. 1 is a schematic view of a throttle valve for a damper;

FIG. 2 is a schematic diagram of a positive stroke, low speed operation of the throttle valve;

FIG. 3 is a schematic diagram of the positive stroke high speed operation of the throttle valve;

FIG. 4 is a schematic diagram of reverse throttle operation;

description of numbering: 1 valve pin, 2 valve seats, 3 valve sleeves, 4 large springs, 5 valve covers, 6 small springs, 7 outer check rings and 8 inner check rings.

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.

Fig. 1 is a schematic structural composition diagram of the invention, and the throttle valve comprises avalve pin 1, avalve seat 2, avalve sleeve 3, alarge spring 4, avalve cover 5, asmall spring 6, anouter retainer 7, aninner retainer 8 and the like. Thevalve seat 2 is in an H-shaped tubular structure, a group of oil holes are distributed in an annular mode at the position, close to the side wall, of the middle partition plate, a small hole is formed in the center of the middle partition plate, and a circle of annular holes are formed in the side wall of the upper cavity of the valve seat; thevalve seat 2 is connected with the upper end of a piston rod of the buffer to divide the buffer into two oil cavities; the tail of thevalve pin 1 is of a T-shaped cylindrical structure, and a group ofvalve pins 1 are arranged in holes in the upper part of thevalve seat 2; thevalve bush 3 is of a T-shaped tubular structure, the side wall of the middle of an inner circle is provided with an annular groove, the middle of the groove is provided with 1 group of oil holes, the inner circle of thevalve bush 3 is assembled on the excircle of the middle upper part of thevalve seat 2, and the upper part of thevalve bush 3 is respectively contacted with the upper and lower end surfaces of the valve seat and the end surface of thevalve pin 1;big spring 4 assembles on the lower part excircle ofdisk seat 2, and the terminal surface laminating under 3 upper portions of big spring and thevalve barrel 3, outer retainer ring assembly in the lower part of disk seat, the terminal surface contact under up end and thebig spring 3, compressesbig spring 4, andvalve cover 5 is "U" type annular structure, and the hole is dug at the center, and the assembly is invertedly atdisk seat 2 lower part intracavity, andlittle spring 6 assembles inside in the valve gap, and the lower extreme passes throughlittle retainer ring 6 to be fixed in the cavity of 2 lower parts of disk seat.

FIG. 2 is the normal stroke small speed working principle of the present invention, the oil pressure in the oil chamber can only overcome the acting force of thesmall spring 6 to open thevalve cover 5, at this time, the oil hole in the center of thevalve seat 2 is completely opened, and the oil enters the oil return chamber through the damping hole to generate the damping force; FIG. 3 is a positive stroke high speed working principle of the present invention, the oil pressure in the oil chamber can overcome the acting force of thesmall spring 6 to open thevalve cover 5, meanwhile, the oil pressure acts on thevalve sleeve 3 through thevalve pin 1, the oil hole in the middle of the side wall of thevalve sleeve 3 and the damping hole in the side wall of thevalve seat 2 are combined with each other by overcoming the acting force of thelarge spring 4, and the oil in the oil chamber enters the oil return chamber through the central damping hole and the side wall damping of thevalve seat 2 to generate; FIG. 4 shows the reverse stroke working principle of the present invention, the upper part of thevalve sleeve 3 is attached to the end surface of thevalve seat 2 under the pressure of the oil return chamber and the acting force of thelarge spring 4, the oil hole on the side wall of thevalve seat 2 is closed, the upper part of thevalve cover 5 is attached to the middle end surface of thevalve seat 2 under the pressure of the oil return chamber and the acting force of thelarge spring 4, the oil hole at the center of thevalve seat 2 close to the side wall, the center oil hole of thevalve cover 5 coincides with the center small oil hole of thevalve seat 2, and at this time.

The foregoing is merely a detailed description of the embodiments of the present invention, and some of the conventional techniques are not detailed. The scope of the present invention is not limited thereto, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A throttle valve for a buffer is characterized in that: the throttle valve includes: the valve comprises a valve pin, a valve seat, a valve sleeve, a large spring, a valve cover, a small spring, an outer retainer ring and an inner retainer ring;

2. The throttle valve for a shock absorber according to claim 1, wherein: and a circle of second oil holes are formed in the side wall of the upper cavity of the valve seat along the radial direction.

3. The throttle valve for a shock absorber according to claim 2, wherein: the inner side wall of the valve sleeve is provided with a circle of annular grooves; and a circle of third oil holes matched with the second oil holes are radially arranged in the annular groove.

4. The throttle valve for a shock absorber according to claim 2, wherein: and a second through hole is formed in the center of the central partition plate of the valve seat, and the area of the second through hole is not more than 30% of the total area of the circle of the first oil holes.

5. The throttle valve for a shock absorber according to claim 4, wherein: and a third through hole is formed in the center of the bottom of the valve cover, and the diameter of the third through hole is smaller than the difference value between the diameter of a circle formed by the circle centers of the circle of the annular first oil holes and the diameter of the first oil holes.

6. The throttle valve for a shock absorber according to claim 5, wherein: the diameter of the third through hole is larger than that of the second through hole.

7. The throttle valve for a shock absorber according to claim 6, wherein: the outer side wall of the upper end of the valve sleeve is provided with an annular flange edge; the upper end face of the annular flange is in contact with the lower end face of the annular boss of the valve seat, and the upper end face of the annular flange is also in contact with the bottom end face of the valve pin.

8. The throttle valve for a shock absorber according to claim 7, wherein: and the side wall of the lower end of the valve seat is radially provided with a pin for fixing the outer check ring and the inner check ring.