CN111043087A

CN111043087A - Open piston for accumulator

Info

Publication number: CN111043087A
Application number: CN201911276557.7A
Authority: CN
Inventors: 匡克焕; 吴泽铭; 曾华勇
Original assignee: SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY CO Ltd
Current assignee: SICHUAN LINGFENG AVIATION HYDRAULIC MACHINERY CO Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-04-21
Anticipated expiration: 2039-12-12
Also published as: CN111043087B

Abstract

The invention discloses an open piston for a pressure accumulator, aiming at providing an open piston structure which has simple structure and can bear reverse pressure, and the invention is realized by the following technical scheme: the supporting sleeve mounting groove of the piston is provided with a supporting sleeve, the whole ring of the supporting sleeve mounting groove is cut into two semicircular rings along the axial direction by 45 degrees, the two semicircular rings are locked in the mounting groove on the piston by a cylindrical pin, the radial and axial movement of the supporting sleeve is limited, a supporting ring for supporting the piston structure is arranged on a radial groove of the outer ring of the supporting sleeve, two axial limiting sealing rings of the supporting sleeve which are symmetrical in opposite directions keep the sealing ring in a sealing groove of the piston, and the circumferential rotation of the supporting sleeve is limited by a stop bolt and a locking gasket 6, so that the cylindrical pin is prevented from falling off. The invention solves the problem that the conventional open sealing groove can not ensure that the sealing ring can bear larger back pressure and friction force.

Description

Open piston for accumulator

Technical Field

The present invention relates to an open piston structure applied to a piston of a column piston type pressure accumulator or a gas-liquid converter, and more particularly, to an open piston structure suitable for a spring energy storage sealing ring.

Background

The hydraulic accumulator is a device for storing the potential energy of incompressible liquid and maintaining the pressure by some external power source, called accumulator for short, and is widely applied to mechanical oil supply systems and hydraulic control systems for absorbing pressure pulsation and impact pressure or used as a hydraulic accessory of a power source. The pressure accumulators used in hydraulic control systems as energy storage and release devices are of various types, and can be classified into gravity type, spring type and pneumatic type according to the way of storing energy, and can be classified into gas cylinder type, piston type and capsule type according to the structural form. Piston and capsule types are the two most commonly used hydraulic accumulator structures. Wherein its core subassembly of piston accumulator is the piston, through the seal structure on piston and the piston, keeps apart the accumulator into two parts of air cavity and sap cavity, and the physical process of its work is: the method comprises the steps of charging nitrogen with a certain pressure into an air cavity of an accumulator in advance, when the pressure of oil in a hydraulic cavity connected to a hydraulic system is larger than the pressure of the air cavity, pushing a piston to compress air to do work by pressure oil, converting hydraulic energy into gas potential energy, storing the oil in the hydraulic cavity, and when the pressure in the hydraulic cavity is reduced and is lower than the pressure in the air cavity, expanding the air to push the piston to discharge the oil in the hydraulic cavity to do work. The gas-liquid converter has the same structure as the pressure accumulator, and the gas generator connected with the gas cavity continuously generates high-pressure gas to push the piston to move and compress hydraulic oil at the other end to do work. The hydraulic accumulator is one of the most basic accessories of the airplane hydraulic energy system, the functional failure of the hydraulic accumulator not only directly affects the working performance of the hydraulic energy system and the service life of the hydraulic accessories, but also seriously and even directly endangers the flight safety in relation to whether the hydraulic system can normally work to ensure the use reliability of the hydraulic accumulator. The piston type accumulator is one of the hydraulic accumulator types commonly selected by aircraft hydraulic systems due to the advantages of simple structure, easy installation and fixation, long service life and the like. However, in the design process of the piston type pressure accumulator, if some detailed problems are not properly treated, the realization of the pressure accumulator function is influenced, extremely serious consequences are caused, and the fault reason is difficult to find. In the pressure accumulator, the piston may be stuck in the cylinder under the following two conditions: a) foreign matters are arranged in the pressure accumulator, and are clamped between the piston and the cylinder body when the piston moves, so that the piston is clamped; b) the clearance between the piston and the cylinder is too small. The calculation result of the minimum clearance calculation according to the theoretical value of the drawing shows that if the outer circle of the piston of the pressure accumulator and the inner circle of the cylinder tend to the upper limit value during processing, the pressure accumulator is possible to generate piston clamping stagnation even at 40 ℃. Because the sealing structure type between piston and the barrel is I type inside movable seal, if the method of increasing the inner circle size of the barrel is adopted, the compression amount of the sealing ring of the sealing element is reduced, the internal sealing performance of the sealing ring is influenced, and after the inner circle size of the barrel is increased, in order to ensure the minimum wall thickness of the barrel, the outer circle size of the barrel and the nominal diameter of the connecting thread need to be increased. The column piston type pressure accumulator divides the cavity into a body cavity and a liquid cavity through a built-in piston, and the piston and a sealing structure thereof are the key of the design of the pressure accumulator and can directly influence the sealing performance and the working reliability of the pressure accumulator. A conventional accumulator piston as shown in fig. 3 is a closed type piston, that is, two seal grooves are directly machined on the piston for installing a seal having a large elongation, such as an O-ring or a steve. When the steckel structure is selected, the sealing element is easy to damage in the process of assembling and closing the sealing element, and the operation requirement is high.

With the development of sealing technology, more and more types of seals are coming up in succession, such as the flood seal manufactured by terreburg, the spring-loaded sealing ring manufactured by santa clara, etc. The novel sealing features that the spring ring is used as the force applying element, the allowable radial stretching amount is small, so that the sealing element is not suitable for a conventional rectangular sealing groove, and the piston needs to be designed into an open sealing groove structure for installing the sealing element of the type. The conventional open type sealing groove is limited by the radial stretching amount of the spring energy storage sealing ring, only a very short boss is designed for axial limiting after assembly is completed, and the risk of separation from the open type sealing groove can be caused under the condition of large reverse pressure or friction force.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and particularly aims to solve the problem that the conventional open sealing groove cannot ensure that a sealing ring can bear larger back pressure and friction force. The open type piston structure is simple in structure and capable of bearing reverse pressure, and the problem that an advanced spring energy storage sealing ring cannot be assembled on a conventional closed type piston is effectively solved.

The technical scheme adopted by the invention for solving the technical problems is as follows: an open piston structure for an accumulator, comprising: the assembly has the piston 1 of open seal groove in the accumulator urceolus, assembles sealing washer 5 on the open seal groove of piston 1 and the support cover 3 that distributes along the generating line direction around piston 1, its characterized in that: the supporting sleeve mounting groove of the piston 1 is provided with a supporting sleeve 3, the whole ring of the supporting sleeve is cut into two semicircular rings along the axial direction by 45 degrees, the cylindrical pin 2 locks the two semicircular rings in the mounting groove on the piston 1, the radial and axial movement of the supporting sleeve 3 is limited, a supporting ring 4 which plays a supporting role for a piston structure is arranged on an outer ring radial groove of the supporting sleeve 3, two supporting sleeve 3 axial limiting sealing rings 5 which are symmetrical in opposite directions keep a sealing ring 5 in a sealing groove of the piston 1, and the supporting sleeve 3 is limited to rotate in the circumferential direction by a stop bolt 7 and a locking gasket 6, so that the cylindrical pin 2 is prevented from falling off.

Compared with the prior art, the invention has the following gain effects:

aiming at the problem that the conventional open sealing groove can not ensure that the sealing ring can bear larger back pressure and friction force, the invention adopts the sealing ring 5 assembled on the open sealing groove of the piston 1 and the supporting sleeves 3 distributed around the piston 1 along the direction of a generatrix, locks the two semicircular rings in the mounting groove on the piston 1 by the cylindrical pin 2, limits the radial and axial movement of the supporting sleeves 3 and has simple integral structure. The defects that the open sealing groove of the conventional accumulator piston is limited by the radial stretching amount of the spring energy storage sealing ring, the risk of separation from the open sealing groove is caused under large reverse pressure or friction force, the sealing element is easy to damage in the closing process of the sealing element assembly, and the operation requirement is high are overcome.

The support sleeve 3 is integrally cut into two parts, the position of the support sleeve is limited by a cylindrical pin and a stop bolt after the support sleeve is arranged on the upper mounting groove of the piston, and the seal 5 ring is kept in the seal groove, so that the support ring 4 which can ensure the good guiding and sliding of the matching surface of the piston and the inner wall of the outer cylinder can be ensured, the metal structure of the piston can be effectively prevented from contacting with the cylinder wall of the outer cylinder of the pressure accumulator, and the cylinder wall can be prevented from being scratched, and the problems that the conventional closed piston cannot be assembled with an advanced spring energy storage seal ring, and the conventional open seal groove cannot ensure.

Drawings

Fig. 1 is a front view of an open piston for a pressure accumulator according to the present invention.

Figure 2 is a side cross-sectional view of figure 1,

fig. 3 is a schematic view of the open seal groove of the accumulator piston of fig. 2.

Fig. 4 is a schematic view of an open seal groove structure with a conventional closed piston.

In the figure: 1 piston, 2 cylindric locks, 3 support cover, 4 supporting ring, 5 spring energy storage sealing washer, 6 stop bolt, 7 stop gasket.

The invention is further illustrated with reference to the following figures and examples, without thereby limiting the scope of the invention to the described examples. All such concepts are intended to be within the scope of the present disclosure and the present invention.

Detailed Description

See fig. 1-3. In a preferred embodiment described below, an open piston structure for an accumulator includes: assembled in the accumulator outer cylinder, there are piston 1 made with open seal groove, seal ring 5 assembled on the open seal groove of piston 1 and support sleeve 3 distributed along the generatrix direction around piston 1, wherein: the supporting sleeve mounting groove of the piston 1 is provided with a supporting sleeve 3, the whole ring of the supporting sleeve is cut into two semicircular rings along the axial direction by 45 degrees, the cylindrical pin 2 locks the two semicircular rings in the mounting groove on the piston 1, the radial and axial movement of the supporting sleeve 3 is limited, a supporting ring 4 which plays a supporting role for a piston structure is arranged on an outer ring radial groove of the supporting sleeve 3, two supporting sleeve 3 axial limiting sealing rings 5 which are symmetrical in opposite directions keep a sealing ring 5 in a sealing groove of the piston 1, and the supporting sleeve 3 is limited to rotate in the circumferential direction by a stop bolt 7 and a locking gasket 6, so that the cylindrical pin 2 is prevented from falling off.

The invention can also obtain other technical schemes according to the above embodiments without creative labor, and equivalent changes made within the protection scope of the invention are all within the protection scope of the invention.

Claims

1. An open piston for an accumulator comprising: the assembly has piston (1) of open seal groove in the accumulator urceolus, assembles sealing washer (5) on piston (1) open seal groove and support cover (3) around piston (1) along generating line direction distribution, its characterized in that: support cover installation slot of piston (1) is equipped with support cover (3) that a whole ring cut into two semicircle rings along axial 45 degrees, cylindric lock (2) are in the mounting groove of two semicircle ring locking on piston (1), restriction support cover (3) are radial and axial displacement, and support and be equipped with support ring (4) that play supporting role to piston structure on the radial recess of cover (3) outer loop, 3 axial spacing sealing washer (5) of support cover of two opposite symmetry, will seal (5) the circle and keep in the seal groove of piston (1), and with stop bolt (7) and locking washer (6) restriction support cover (3) circumferential direction, prevent that cylindric lock (2) from droing.