阅读说明：本技术 一种自限压活塞式蓄能器及双级压力式蓄能器 (Self-limiting piston type energy accumulator and two-stage pressure type energy accumulator ) 是由 郭茂春 赵伟 于 2020-12-31 设计创作，主要内容包括：本发明提出了一种自限压活塞式蓄能器及双级压力式蓄能器。所述的自限压活塞式蓄能器与现有技术相比,在高压气体腔内设有中间限位套,中间限位套在缸体内被轴向固定位置,中间限位套的中心是通气腔,当压力变化不大时,活塞可以根据压力的变化在限位结构与油端封堵之间移动,与液压系统的压力达到一个动态平衡状态；而当油端压力大范围波动时,活塞被限位装置限位,气端压力不再升高,油端的压力变化不再占用行程,获得理想刚度特性。所述的一种双级压力式蓄能器,采用2个自限压活塞式蓄能器串联组合而成,成为双气压力式结构中,液压端执行元件的行程可以全部作用在另一级压力中,以保证进一步获得理想的刚度特性。(The invention provides a self-limiting piston type energy accumulator and a two-stage pressure type energy accumulator. Compared with the prior art, the self-pressure-limiting piston type energy accumulator has the advantages that the middle limiting sleeve is arranged in the high-pressure gas cavity, the middle limiting sleeve is axially fixed in the cylinder body, the center of the middle limiting sleeve is the ventilation cavity, when the pressure change is not large, the piston can move between the limiting structure and the oil end plug according to the pressure change, and the piston and the pressure of a hydraulic system reach a dynamic balance state; when the pressure of the oil end fluctuates in a large range, the piston is limited by the limiting device, the pressure of the gas end is not increased, the pressure change of the oil end does not occupy the stroke, and the ideal rigidity characteristic is obtained. The double-stage pressure type energy accumulator is formed by combining 2 self-limiting piston type energy accumulators in series, and is formed into a double-air pressure type structure, and the stroke of a hydraulic end execution element can be completely acted in the pressure of the other stage so as to ensure that ideal rigidity characteristics are further obtained.)

1. The utility model provides a from voltage limiting piston accumulator, includes cylinder, gas end shutoff, oil end shutoff, piston, and the gas end shutoff has gas charging valve and sealing member, and the oil end shutoff takes the oil mouth to connect, has two-way sealing member on the piston, and the high-pressure gas chamber is sealed to one end, and the high-pressure oil chamber is sealed to one end, its characterized in that: the high-pressure gas cavity is internally provided with a middle limiting sleeve, the middle limiting sleeve is axially fixed in the cylinder body, the center of the middle limiting sleeve is a ventilation cavity, and the end face of the middle limiting sleeve, which is positioned at one end of the piston, is used for limiting the moving range of the piston.

2. A self-limiting piston accumulator in accordance with claim 1 wherein: the middle limiting sleeve is provided with a buffer device on the end surface at one end of the piston.

3. A self-limiting piston accumulator in accordance with claim 2, wherein: the buffer device is a rubber sleeve.

4. A self-limiting piston accumulator as claimed in claim 1 or 2 wherein: the excircle of the middle limiting sleeve is a stepped journal, the middle limiting sleeve is limited on the steps in the cylinder barrel, and the axial position of the middle limiting sleeve is fixed through an elastic clamping ring.

5. A two-stage pressure accumulator, comprising: the self-pressure-limiting piston type energy accumulator is formed by combining two self-pressure-limiting piston type energy accumulators in series according to any one of claims 1 to 3.

6. A two-stage pressure accumulator, comprising: the self-pressure-limiting piston type energy accumulator is formed by combining two self-pressure-limiting piston type energy accumulators in series according to claim 4.

Technical Field

The invention relates to a structure of a piston type energy accumulator, in particular to a self-limiting piston type energy accumulator and a two-stage pressure type energy accumulator.

Background

The conventional piston type energy accumulator has the defect that as the pressure of a hydraulic oil end is increased, the gas volume of the energy accumulator is reduced in a geometric series manner, and a large amount of volume of the hydraulic end, such as the stroke of a hydro-pneumatic spring cylinder, is occupied. Therefore, when the load change of the hydraulic end is large, the rigidity characteristic of the commonly used piston type energy accumulator becomes poor; the rigidity characteristic is improved by adopting a double-stage pressure type structure, and the volume change or the stroke change of the hydraulic end is too large, so that the structure of the hydraulic end actuator is increased or the stroke is lengthened.

Disclosure of Invention

The invention provides a self-pressure-limiting piston type energy accumulator, which aims to solve the problem that the range of stroke change cannot be adapted when the pressure of an oil end fluctuates in a large range so as to obtain ideal rigidity characteristics.

The invention adopts the following scheme to realize the purpose: the utility model provides a from voltage limiting piston accumulator, includes cylinder, gas end shutoff, oil end shutoff, piston, and the gas end shutoff has the inflation valve, and the oil end shutoff has the oil mouth to connect, has the sealing member on the piston, the sealed high-pressure gas chamber of one end, the sealed high-pressure oil chamber of one end, its characterized in that: the high-pressure gas cavity is internally provided with a middle limiting sleeve, the middle limiting sleeve is axially fixed in the cylinder barrel, the center of the middle limiting sleeve is provided with a ventilation cavity, and the end face of the middle limiting sleeve, which is positioned at one end of the piston, is used for limiting the moving range of the piston.

Furthermore, the middle limiting sleeve is provided with a buffer device on the end face located at one end of the piston, and when the piston moves to the middle limiting sleeve, the buffer device plays a role in buffering, and rigid impact is avoided.

Further, the buffer device is a rubber sleeve.

Furthermore, the excircle of the middle limiting sleeve is a stepped shaft neck, the middle limiting sleeve is limited on the step in the cylinder barrel, and the axial position of the middle limiting sleeve is fixed through the elastic clamping ring, so that the middle limiting sleeve is ensured to be fixedly connected with the cylinder barrel.

Furthermore, when the pressure change is not large, the piston can move between the middle limiting sleeve and the oil end plug according to the pressure change, and the pressure reaches a dynamic balance state with the pressure of a hydraulic system; when the pressure changes greatly, the piston moves to the position of the middle limit sleeve, and the pressure at the gas end is not increased because the piston is tightly attached to the middle limit sleeve and does not move any more, thereby obtaining the ideal rigidity characteristic.

The invention also provides a two-stage pressure type energy accumulator which is formed by combining two self-limiting piston type energy accumulators in series, and the two self-limiting piston type energy accumulators are in a double-air pressure type structure, the stroke of a hydraulic end actuating element can be completely acted in the other stage of pressure, excessive volume change cannot be occupied due to large pressure difference, the inherent characteristics of the hydro-pneumatic spring cylinder can be fully exerted, and the ideal rigidity characteristic can be further obtained.

The invention has the beneficial effects that: the middle limiting sleeve is arranged in the high-pressure gas cavity, and when the pressure change is not large, the piston can move between the limiting structure and the oil end plug according to the pressure change and reaches a dynamic balance state with the pressure of the hydraulic system; when the pressure of the oil end fluctuates in a large range, the piston is limited by the limiting device, the pressure of the gas end is not increased, the pressure change of the oil end does not occupy the stroke, and the ideal rigidity characteristic is obtained.

Drawings

Fig. 1 is a block diagram of a self-limiting piston accumulator of the present invention.

Shown in the figure: 1. plugging the air end; 2. a cylinder barrel; 3. a middle limit sleeve; 4. a buffer device; 5. a piston; 6. plugging an oil end; 7. an oil port joint; 8. an inflation valve; 9. an elastic collar.

Detailed Description

The invention is further described, as shown in fig. 1: a self-pressure-limiting piston type energy accumulator comprises a gas end plug 1, a cylinder barrel 2, a middle limiting sleeve 3, a buffer device 4, a piston 5, an oil end plug 6, an oil port connector 7, an inflation valve 8 and an elastic retainer ring 9, wherein the piston is filled with nitrogen or other inert gases by the inflation valve 8, and the other end of the piston is communicated with a hydraulic system through the oil port connector 7; the inflation valve 8 is installed on the gas end shutoff 1, the hydraulic fluid port connects 7 and installs on the oil end shutoff 6, there is the sealing member on the piston 5, the sealed high-pressure gas chamber of one end, the sealed high-pressure oil chamber of one end, middle stop collar 3 is installed at the high-pressure gas intracavity, middle stop collar 3 is by axial fixed position in cylinder 2, the center of middle stop collar is the chamber of ventilating, the terminal surface that middle stop collar 3 is located 5 one ends of piston is used for limiting the displacement range of piston.

As shown in fig. 1, the buffer device 4 is a rubber sleeve; the rubber sleeve is easy to obtain, simple in structure, beneficial to arrangement of the middle limiting sleeve and capable of being directly bonded on the end face of the middle limiting sleeve.

As shown in figure 1, the excircle of the middle limiting sleeve 3 is a stepped shaft neck, the middle limiting sleeve is limited on the step in the cylinder barrel and the axial position of the middle limiting sleeve is fixed through an elastic clamping ring 9 to ensure that the middle limiting sleeve and the cylinder barrel form fixed connection.

The working principle of the self-pressure-limiting piston type energy accumulator is as follows: referring to fig. 1, when the piston is closed against the oil end, the initial pressure is P0; the volume from the middle limit sleeve to the gas end is V1, and V1 is constant volume; the volume from the middle limiting sleeve to the nearest end face of the piston is V2, and V2 is the maximum value of the variable volume; when the pressure changes in a small range, the piston can freely move between the oil end plug and the limiting device, so that dynamic balance is achieved; when the pressure reaches or exceeds (V1 + V2)/V1P 0, the middle limiting sleeve limits the piston, the pressure at the gas end does not rise any more, if the pressure at the oil end continues to rise, the volume or stroke of the oil end does not change because V1 does not change, namely the volume or stroke of the oil end is not occupied by the pressure change at the oil end.

When the two self-pressure-limiting piston type energy accumulators are combined in series to form the two-stage pressure type energy accumulator, the stroke of the hydraulic end actuating element can be completely acted in the other stage of pressure, excessive volume change cannot be occupied due to large pressure difference, the inherent characteristics of the hydro-pneumatic spring cylinder can be fully exerted, and the ideal rigidity characteristic can be further obtained.

Simple combinations, equivalents and further modifications which do not depart from the technical idea of the invention should be apparent to those skilled in the art from the scope of the invention.