High pressure pneumatic hydraulic piston accumulator

FIELD: engines and pumps.

SUBSTANCE: accumulator is designed to accumulate power in hydraulic drives with alternating consumption of liquid power. The accumulator comprises case made as a cylinder sleeve with a dead spherical bottom which has a stop support end surface and a central inlet for gas supply, removable cover with an axial hole for supplying working liquid and an end support, dividing piston installed inside the case-sleeve and capable of reciprocal motion thus creating liquid and gas chambers; at that the piston includes two packing portions, mutually spaced in the axial direction of the piston and moving along the inside wall of pneumatic hydraulic accumulator, at that a threaded portion is formed on the outside surface of the case-sleeve from the open part side, this threaded portion has a directing surface and a packing device, while the medium part has heat exchanging elements in kind of a developed peripheral surface with a formation of a row of ring ribs mutually and evenly spaced on the said surface in the axial direction; the said ribs have trapezoid section and made integrally with a case-sleeve.

EFFECT: increase of operational reliability, safety, manufacturability and maintainability.

5 cl, 5 dwg

 

The invention relates to the field of engineering, namely, devices for energy storage used in hydraulic variable power consumption of a liquid and a large short-term consumption, as well as to provide additional power to the hydraulic actuator of the working fluid and damping of pressure pulsations.

Known piston hydraulic gas accumulator (battery), comprising a housing with a liquid and a gas cavity, a separator cavities in the form of a piston. (see the book Timbuktu Hydraulic actuators aircraft", publishing house "engineering", Moscow, 1967, s.293, RIS). Piston seal in a known battery is achieved by using rubber o-rings. To improve the tightness and lubricate these sealing rings used liquid shutter, created by filling the working fluid annular outer groove of the piston.

Known for the design of the battery after discharge stores in oral liquid shutter pressure exceeding the pressure of the gas. This liquid is fed in an annular groove on the piston located between the two sealing rings and auxiliary differential piston under spring force and the force of fluid pressure in the chamber of the differential piston.

Giving is giving in this chamber, consequently, and in the annular groove of the piston depends on the difference of these forces and will be the maximum excess pressure of gas at zero pressure fluid. This allows lubrication of the sealing rings of the piston, including the ring, situated on the side of the gas chamber, in a discharged state of the battery.

Known for the design of the battery differs complexity and adaptability to manufacture because of the need to ensure not only the accuracy of manufacturing, and strict alignment of the interacting parts of the piston and placed in it a spring-loaded differential piston.

To the disadvantage of the known device should still be considered insufficiently reliable method of fastening the removable covers on both sides of the battery with the flat elastic rings, the formulation of which largely solves the problem of perception is not axial and radial loads.

Also known piston accumulator, comprising a housing with a socket for the supply of fluid under pressure (see patent DE 10206289 A1, 7 F15 1/24 from 15.02.2002 year). In case the specified battery slide the piston separating the liquid and gas chambers. The battery between the piston and the housing contains two o-ring seals spaced from each other at a distance "a". One of the seals is pressurized working the second fluid, and the other under the pressure of the gas environment.

To ensure lubrication of the gas seal, the distance "a" between the seals is less than the stroke of the piston. In addition, between the piston and the housing in the area of the sealing fluid provides lubrication gap S through which fluid from the working chamber, the dampening piston is moved o-rings depending on the stroke.

However, a significant disadvantage of the known construction is that captured by the piston lubrication when the battery is moved out as well with the outer surface of the piston sealing ring mounted in the middle part of the piston, thus excluding the possibility of the admission of lubricant to the o-ring placed on the side of the gas chamber. This drawback reduces the operational reliability of the battery.

Known analogues of the proposed technical solution closest to the technical essence is adopted as the prototype of the piston accumulator (see patent WO 3016723 A2, 7 F15 from 18.07.2002 year). Known piston accumulator contains the maximum number similar to the inventive pneumatic-hydraulic piston accumulator (pneumohydraulic accumulator) structural characteristics, namely: a housing made in the form of tsilindricheskogo with a hollow spherical bottom with the bounding thrust face surface and a Central inlet for the supply of gas, removable lid with an axial hole for supplying a working fluid and a support end, a dividing piston mounted inside the sleeve with the possibility of reciprocating movement and formation of liquid and gas chambers, and the piston includes two sealing section, spaced apart in the axial direction of the piston and moving along the inner wall of the pneumatic-hydraulic accumulator.

By virtue of the known hydraulic accumulator is that it to implement a supply of liquid lubricant to the sealing elements of the piston on its outer surface formed annular groove - collector, with the possibility of a message with additional centrally located source of nourishment working fluid in the form of auxiliary spring-loaded piston accumulator. Generally known pneumohydraulic accumulator different structural complexity and, consequently, excessive labor costs.

A common shortcoming of these piston accumulators is the presence of friction of the piston in the cylinder, which creates a hysteresis effect. Loss of pressure to overcome the friction forces and inertia forces of the piston be 1.6...of 3.2 kgf/cm2. Because static friction force of the piston, sealed with rubber rings, may exceed four or more times with the Lu friction movement (and long stay alone this excess can reach ten times the value), possible even spasmodic movement of the piston under the effect of gas compressibility and the considerable inertia of the piston can develop into harmonic oscillations of the piston with a high frequency and a large amplitude.

Due to the large accelerations and large masses of the piston inertia forces when such fluctuations can be large, can cause unacceptable pressure fluctuations in the gas chamber of the accumulator and its associated hydraulic line. These fluctuations can cause fatigue failures of parts of the battery, as well as various hydraulic devices of the system (see the book Timbuktu Hydraulic actuators aircraft", publishing house "engineering", Moscow, 1967, s.293).

It should be noted that in the process of charging hydraulic gas accumulator piston type there is an increase in pressure and heating of the compressed gas in the oral environment, with considerable evolution of heat. Conversely, when the battery is discharged and making them useful work is the expansion of the gas in the gas chamber, accompanied by lowering of the temperature and pressure in it. To achieve the most efficient operation of the hydraulic accumulator and increase its efficiency processes occurring in the gas chamber of the accumulator at the time of charging and discharging, should be max is maximum close to the isothermal process, in which the relationship between the main parameters of gas is expressed by the law of Boyle - Mariott: pV=RT=const, which implies that at constant temperature gas (T) its volume (V) is inversely proportional to the pressure (p).

Known piston accumulator adopted as an analogue of the prototype has another disadvantage in that in addition to structural and technological complexity of the separating piston, leading to an increase in its mass and inertial forces in the hydraulic accumulator is missing a number of essential structural elements, which would have intensified the heat from the gas chambers during compression of gas at the time of charging, and, accordingly, conducted heat input from the environment when the expansion of the gas during discharge of the battery, which increases the efficiency of the battery and produce external work due to the approximation of thermodynamic processes in the gas chamber to isothermal.

Together these disadvantages of the known piston accumulators and analog prototype sufficiently reduce performance and limit its use, for example, in aeronautical engineering.

Due to the nature of operation of the piston type accumulators, found a fairly wide distribution in the system is Emax aircraft control, for the design of accumulators along with the traditional are a number of additional special requirements as reliability and durability, and simplicity of construction, overall mass perfection, convenience of Assembly and disassembly in a limited mounting space, convenience and safety in operation.

The technical object of the present invention is to provide such design pneumatic-hydraulic piston accumulator for high pressure, which combines the features and advantages of the known accumulators, but has a more simple and reliable and more sophisticated design with simultaneous achievement of other technical and economic indicators:

- improving the strength characteristics of the main elements of power, pneumatic-hydraulic accumulator by giving them a spherical shape,

- improving efficiency and providing constructive increasing range of external work due to the approximation processes in the gas chamber to isothermal.

- minimization of the magnitude of mechanical friction when moving the separating piston, the weight of the piston, the inertial forces and hysteresis phenomena in transient conditions,

implementation the simplest way to supply lubrication to the seal piston installed on the sides of the gas chambers,

- the application of more advanced methods for preparations and cheap technological steels for the manufacture of power parts pneumohydraulic accumulator.

The problem is solved in that in the proposed pneumatic-hydraulic piston accumulator for high pressure, comprising a housing made in the form of a cylindrical sleeve with a hollow spherical bottom with the bounding thrust face surface and a Central inlet for supplying a gas, a removable lid with an axial hole for supplying a working fluid and a support end, a dividing piston mounted inside the sleeve with the possibility of reciprocating movement and formation of liquid and gas chambers, and the piston includes two sealing section, spaced apart in the axial direction of the piston and moving along the inner wall of the pneumatic-hydraulic accumulator according to the invention on the outer surface casing-liner is formed from the side of the open part, a threaded section with the track surface and the sealing device, and in the middle of the heat exchange elements in the form of advanced peripheral surface with the formation therein of a number of spaced each other at an equal distance in the axial direction of the annular ribs with trapezoidal form is ecene and made in one piece with the casing-sleeve, when this annular ribs are equidistant radially from the longitudinal axis of the housing-liners, and the ratio of the height of the trapezoid cross-section of the ribs to the diameter of the mirror casing-liner is selected in accordance with the equation:

HTr/DC≥0,028, where

HTr- the height of a trapezoid-sectional annular rib, mm

DC- diameter of mirror housing-liners, mm.

according to the invention the bottom of the removable cover is made in the form of a concave spherical surface, and the cover is rigidly fixed to the body of the sleeve by a threaded connection and the axial preload via formed on the inner surface of the annular support face surface with additional external locking of one or more set screws, evenly spaced around the circumference and are secured by cerite-top into the slot in the thread at two or three points the depth of 1,0...1,5 mm with corner punch 60°.

according to the invention the separating piston is formed in the form of a hollow cylindrical Cup, the inner surface of which is made conical, forming the lateral surface of a truncated cone, is coaxially located relative to the outer guide surface and facing a large base in the direction of arrangement of the gas chamber, and a lateral surface of a truncated cone made with a pen the progress in the area of the spherical surface of the bottom part with the repetition of the configuration of the inner spherical cavity removable cover, and sealing of the piston includes two redundant sealing section, spaced in the axial direction and axially moving together with the piston along the inner wall (mirror) housing-liners pneumohydraulic accumulator with the ability to change the volume of the gas chamber, the outer surface of the piston from the location of the gas chamber, in the vicinity of the sealing area is additionally formed through local extension of the internal cavity ring filler lubricant in the form of a groove of trapezoidal cross-section with placing in it the ring maslotorgovlya harness, made of insulating and wear-resistant material, for example, of asbestos,

according to the invention the sealing areas pneumohydraulic accumulator is made in the form embedded in the annular rectangular groove rubber rings with protective PTFE rings installed on both sides of the rubber rings, the size of the cross section of the Teflon rings in the radial direction is equal to the maximum depth of the groove,

according to the invention, the main power elements of design - case, sleeve, cover and dividing piston is made of medium-carbon low-alloy steels, hardened by heat treatment until the average values of hardness, moreover, the mirror housing-liners subjected to electroplating hard chromium plating and honing with subsequent polishing, and hemisphere separation of the piston and a removable cover formed and manufactured by pressing or deep drawing.

In accordance with the invention a distinctive feature of the pneumatic-hydraulic piston accumulator is its compactness and low weight, due to the peculiarities of the spherical shape, attached to the main power components of the battery, as well as the fact that the walls of the spherical bottom, under pressure, there are two times lower voltage in comparison with the walls of the cylinder of the same diameter.

Due to the fact that the mass of the piston is relatively small compared to the mass moved by the operation of the battery fluid, reach the effect of increasing the speed as the acceleration of the piston or deceleration must less effort.

To achieve the target contributes to the fact that the removable end-to-end cover paired with a body-sleeve by threaded connection with additional locking (cerite-top) one or more screws into the slot in the thread at two or three points at a depth of 1...1.5 mm Such removable connection of the cover with the casing-sleeve declare pneumohydraulic Akku is ulator in the technological plan is quite simple and has compared with the prototype of the much greater strength, reliability, ease and convenience of Assembly and disassembly during operation.

In General, the proposed solution is mainly due to the need to ensure compactness of layout of the proposed battery of the hydraulic control systems of aircraft and facilities connected to the respective conduits of power.

Due to the formation of the outer surface of the casing-sleeve heat-exchange elements in the form of spaced between an annular rib managed thermodynamic processes occurring in the gas chamber during charging and discharging of the battery closer to isothermal, which provided the increase in efficiency of the battery, its strength and rigidity of the hull.

Forming on the outer surface of the piston ring filler grease production maslotorgovlya harness provided the flow of liquid lubricant on the seal placed by the gas chamber during a given period of battery life between the regular service. The use for the manufacture of the power components of the inventive pneumatic-hydraulic accumulator medium-carbon high-strength low-alloy steel type steel 30HGSA significantly reduce the dimensions and weight details.

In the AOR is e contact of the piston with the casing-sleeve implemented redundant seal with protective PTFE rings, dramatically improves the reliability of operation of the inventive pneumatic-hydraulic accumulator and almost completely eliminated the leakage of the working fluid in the external environment.

The application of hard chrome plating on the surface of the mirror casing-liner and apply the finish of machining operations mirrors in the form of honing with subsequent polishing allowed to minimize the magnitude of friction of the movement of the separating piston and significantly increase the resource of functioning of the seals.

The essence of the proposed invention is illustrated by drawings, where:

- figure 1 shows a General view, section a pneumatic piston accumulator for high pressure with a dividing piston 8 mounted inside the sleeve 1 with the formation of the liquid 9 and the gas 10 cameras.

- figure 2 shows a General view, section a pneumatic piston accumulator for high pressure in a charged gas state, for example, when the initial gas pressure pn=110 kgf/cm2

- figure 3 shows a General view, section a pneumatic piston accumulator for high pressure in a charged gas and the working fluid state, for example, when Rgas=prabid.=220 kgf/cm2.

- figure 4 shows the location a in figure 1 - the design option of locking yemei cover 5.

- figure 5 shows the location B in figure 1 - the design of the external sealing sections 11 and 12 of the separating piston 8 and an annular filler lubricant in the form of grooves 22 placed in her harness 23.

The inventive pneumatic-hydraulic piston high-pressure accumulator includes a housing-case 1 (figure 1) with a hollow spherical head 2 with the bounding thrust end surface 3 and the Central inlet 4 for the supply of gas, a removable lid 5 with the axial hole 6 for the supply of the working fluid and the reference end face 7, the separator piston 8 mounted inside the sleeve 1 with the reciprocating movement and the formation of liquid 9 and the gas 10 chambers, the piston 8 includes two sealing portion 11 and 12, spaced apart in the axial direction of the piston 8. On the outer surface of the casing-sleeve 1 is formed with a threaded section 13 with the guide surface 14 and the sealing device 15 and the heat transfer elements in the form of spaced between each other in the axial direction of the annular ribs 16 with the trapezoidal shape of the cross section and made in one piece with the casing-sleeve 1.

The bottom 17 of the removable cover 5 made in the form of a concave spherical surface, and the cover 5 is rigidly fixed to the body of the sleeve 1 by means of threads 18 with a focus on the inner face of the supporting surface is to be 7. The cap 5 additionally secured with grub screw 19 (figure 4).

Dividing piston 8 is formed in the form of a hollow cylindrical Cup, the inner surface 20 of which is made conical with a transition to section 21 with the spherical surface of the bottom part, repeating the spherical configuration of the bottom 17 of the removable cover 5. Sealing of the piston 8 includes two redundant sealing section 11 and 12 (figure 1), and by the location of the gas chamber formed by the annular filler lubricant in the form of grooves 22 (5) of trapezoidal cross-section with placing in it the ring maslotorgovlya harness 23.

External sealing parts 11 and 12 of the pneumatic-hydraulic accumulator is made in the form embedded in the annular rectangular groove 24 of the rubber rings 25 of circular cross section with a protective Teflon rings 26 mounted on both sides of the rubber rings 25.

Pneumatic-hydraulic piston accumulator for high pressure works in the following way:

Before working in the Central inlet opening 4 of the casing-liner 1 is mounted charger - return valve, shown in figure 2 thin lines. Under the step-up gas pressure check valve chargers offer and is charging the gas chamber 10 of the battery until you need what about the initial pressure, for example, to 110...115 kgf/cm2. In the charging process chamber 10 by the gas separating piston 8 is moved to the right (figure 2) provision with an emphasis on mechanical bearing surface 7 removable cover 5, and a convex spherical surface of the piston 8 is most concave spherical cavity cover 5, while maintaining the minimum required internal volume of the liquid chamber 9. In the liquid chamber 9 is the flow of working fluid through the inlet fitting mounted in a removable cover 5 (the fitting shown in figure 3 thin lines).

Due to the fact that the pressure of the working fluid exceeds the pressure in the gas chamber is almost 2 times (210 to 230 kgf/cm2) separating piston 8 under the action of differential pressure moves to the left, towards its original position, compressing the gas and accumulating energy of the liquid.

The movement of the piston 8 under the action of the pressure of the working fluid occurs until equalization of the pressures in the gas chambers 10 and the liquid 9 to a value equal to the pressure of the working fluid. Allocated under this intense heat is diverted into the space around the walls of the casing-sleeve 1 and formed on its outer surface a heat exchange elements is annular ribs 16. Part of the heat is discharged through the piston 8 and the working fluid.

When the battery is discharged and the Commission of the m useful work is the expansion of the gas in the gas chamber 10, accompanied by decrease of temperature and pressure. This process is compensated by the supply of heat from the environment through the heat exchanger annular ribs 16. As a result, the differential pressure between the beginning and the end of discharge is reduced, and the external work increases, which accelerates the processes of charging and discharging for isothermal, leads to stabilization of the pressure and increase accumulated and issued by the energy accumulator.

Samples of the inventive pneumatic-hydraulic piston accumulator for high pressure underwent in-plant and operational tests on the drives and control systems of aircraft. Tests confirmed the accuracy inherent in the design of the inventive pneumatic-hydraulic piston accumulator technical solutions and the ability to obtain a technical result, which consists in simplifying the design of the pneumatic-hydraulic piston accumulator for high pressure, reducing its size and improving the reliability and mass perfection, improving Assembly and disassembly, and other performance characteristics.

1. Pneumatic-hydraulic piston accumulator for high pressure, comprising a housing made in the form of a cylindrical sleeve with a hollow spherical bottom with restrictive resistant front surface and the Central the inlet for the supply of gas, removable lid with an axial hole for supplying a working fluid and a support end, a dividing piston mounted inside the sleeve with the possibility of reciprocating movement and formation of liquid and gas chambers, and the piston includes two sealing section, spaced apart in the axial direction of the piston and moving along the inner wall of the pneumatic-hydraulic accumulator, characterized in that on the outer surface of the casing-liner is formed from the side of the open part, a threaded section with the track surface and the sealing device, and in the middle of the heat exchange elements in the form of advanced peripheral surface with the formation therein of a number of spaced to each other at equal distances in the axial direction of the annular ribs with trapezoidal shape cross-section and made in one piece with the casing-sleeve, with an annular rib equidistant radially from the longitudinal axis of the housing-liners, and the ratio of the height of the trapezoid cross-section of the ribs to the diameter of the mirror casing-liner is selected in accordance with the equation:

HTr/DC≥0,028,

where NTr- the height of a trapezoid-sectional annular rib, mm;

DC- diameter of mirror housing-liners, mm.

2. Pneumatic-hydraulic piston accumulator according to claim 1, trichosis fact, that the bottom of the removable cover is made in the form of a concave spherical surface, and the cover is rigidly fixed to the body of the sleeve by a threaded connection and the axial preload via formed on the inner surface of the annular abutment end surface with additional external locking of one or more set screws, evenly spaced around the circumference and are secured by cerite-top into the slot in the thread at two or three points the depth of 1,0...1,5 mm with corner punch 60°.

3. Pneumatic-hydraulic piston accumulator according to claim 1, characterized in that the separating piston is formed in the form of a hollow cylindrical Cup, the inner surface of which is made conical, forming the lateral surface of a truncated cone, is coaxially located relative to the outer guide surface and facing a large base in the direction of arrangement of the gas chamber, and a lateral surface of a truncated cone made with the transition in the area of the spherical surface of the bottom part with the repetition of the configuration of the inner spherical cavity, the removable lid, and the sealing portion of the piston includes two redundant sealing section, spaced in the axial direction and axially moving together with the piston along the inner wall (mirror) the case is-liner pneumohydraulic accumulator with the ability to change the volume of the gas chamber, the outer surface of the piston from the location of the gas chamber, in the vicinity of the sealing area, additionally formed through local extension of the internal cavity ring filler lubricant in the form of a groove of trapezoidal cross-section with placing in it the ring maslotorgovlya harness, made of insulating and wear-resistant material such as asbestos.

4. Pneumatic-hydraulic piston accumulator according to claim 1 or 3, characterized in that the sealing areas pneumohydraulic accumulator is made in the form embedded in the annular rectangular groove rubber rings with protective PTFE rings installed on both sides of the rubber rings, the size of the cross section of the Teflon rings in the radial direction is equal to the maximum depth of the notch.

5. Pneumatic-hydraulic piston accumulator according to claim 1, characterized in that the main power elements of design - case, sleeve, cover and dividing piston is made of medium-carbon low-alloy steels, hardened by heat treatment until the average values of hardness and mirror housing-liners subjected to electroplating hard chromium plating and honing with subsequent polishing, and hemisphere separation of porn and a removable cover formed and manufactured by pressing or deep drawing.



 

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1 dwg

FIELD: installations for supplying fluid under pressure.

SUBSTANCE: method comprises determining the value of pressure in the vessel preliminary filled with explosion-proof compressible fluid and connected with the distributing device, comparing the value with that required for operation of the motor, and switching valving by the command signal to the air-operated motor of the drive. When the value of pressure in the vessel is higher or equal to the permissible value, the explosion-proof fluid is supplied from the vessel to the air-operated motor, whereas the pumped fluid is not supplied from the pipeline. When the value of pressure is lower than the permissible value, the pumped fluid is supplied from the pipeline to the air-operated motor, and the fluid is not allowed to enter the vessel.

EFFECT: improved environmental protection.

9 cl, 6 dwg

FIELD: transport engineering.

SUBSTANCE: invention can be used on vehicles operating under unstable conditions of movement. According to invention, nonlinear hydraulic damping unit is installed in transmission of vehicle. Said unit contains adjustable restrictor and least two pneumohydraulic accumulators of different rigidly. One input of restrictor is connected with main pneumohydraulic accumulator, and second input, with inputs of each additional pneumohydraulic accumulators.

EFFECT: improved reliability and increased durability of parts of power train owing to stepless change of torque transmitted from engine to wheels or tracks.

1 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to hydraulic systems and it can be used in different vehicles and machine-and-tractor sets operating under unsteady conditions. Proposed device contains planetary train 1 consisting of crown gear 2 and reaction member 3. Reaction member 3 is connected with gear 4 of drive of oil pump 5 and gear 6 of drive of hydraulic motor 7. Gear 4 of drive of oil pump 5 is connected with pump through overrunning clutch 8. Gear of drive of hydraulic motor 7 is connected with hydraulic motor 7 through overrunning clutch 9. Oil pump 5 is connected to suction main line 10 and pressure main line 11. Hydraulic motor 7 is connected to pressure main line 12 and return main line 13. Planetary train 1 is connected with gearbox 15 by shaft of carrier 14 and is set into motion by clutch 16 of engine 17. Adjustable throttle 18 is installed in pressure main line 11. Safety valve 19, control cock 20 and control hydraulic main line 21 with hydraulic distributor 22 are connected to pressure main line 11 before adjustable throttle 18. Device contains also hydraulic tank 26 and pneumohydraulic accumulator 27 consisting of three spaces.

EFFECT: increased efficiency of device.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: accumulator is designed to accumulate power in hydraulic drives with alternating consumption of liquid power. The accumulator comprises case made as a cylinder sleeve with a dead spherical bottom which has a stop support end surface and a central inlet for gas supply, removable cover with an axial hole for supplying working liquid and an end support, dividing piston installed inside the case-sleeve and capable of reciprocal motion thus creating liquid and gas chambers; at that the piston includes two packing portions, mutually spaced in the axial direction of the piston and moving along the inside wall of pneumatic hydraulic accumulator, at that a threaded portion is formed on the outside surface of the case-sleeve from the open part side, this threaded portion has a directing surface and a packing device, while the medium part has heat exchanging elements in kind of a developed peripheral surface with a formation of a row of ring ribs mutually and evenly spaced on the said surface in the axial direction; the said ribs have trapezoid section and made integrally with a case-sleeve.

EFFECT: increase of operational reliability, safety, manufacturability and maintainability.

5 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: device is designed to accumulate power in variable liquid power consumption hydraulic drives, to damp pressure pulsations and to kill hydraulic shocks in supply hydraulic systems. The accumulator incorporates a cylindrical barrel casing, its one end being closed by a spherical bottom with a limiting thrust end face surface, a casing neck making a central gas inlet, a detachable cover furnished with an axial channel to feed working fluid and a thrust end face, a separating piston arranged inside the barrel so as to reciprocate and to form a fluid and gas chambers. Here note that the piston includes two sealing sections spaced axially apart and moving along the accumulator inner wall. Note also that the accumulator represents an integral compact unit, a module, that can be built easily and directly into the system hydraulic drive, the said module incorporating a valve unit with shutting off elements of the "valve-seat" type and detachable coupler.

EFFECT: higher reliability and safety, ease of manufacture and repair.

6 cl, 6 dwg

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