CS242217B1 - Hydropneumatic accumulator with floating piston - Google Patents

Abstract

The invention solves the structural arrangement of a hydropneumatic accumulator, equipped with a floating sealing piston, which is stored in the body of the accumulator without a seal. The hydropneumatic accumulator with a floating sealing piston consists of a cylindrical body, which is closed by an upper and a lower lid. In the cylindrical body, there is a lightened sealing piston, which separates the gas space from the liquid cylinder. The essence of the solution lies in the fact that the first inter-ring seal is placed in the upper lid from the side of the gas space and the first and second annular guide surfaces are created along the outer perimeter of the sealing piston. On the side of the liquid compartment, a second inter-ring seal is placed in the lower lid. A third annular guide surface is formed between the first and second annular guide surfaces. A seal is placed in the third annular] guide flat with a slight bias.

Description

242217

BACKGROUND OF THE INVENTION The invention relates to a structural design of a hydropneumatic accumulator provided with a floating damping piston, which is free of gasket in the body of the accumulator.

Hydro-pneumatic piston accumulator device that allows to collect pressure energy at the time of its excess in the hydraulic circuit. The accumulation of the pressure energy is realized by compressing the gas, which is located in the gas space of the accumulator, separated from the liquid by the casting gas. The damping piston of the present type of accumulator accumulators is stored in the battery shell by means of a seal. The sealing function used by the seals also has the function of preventing the gas from penetrating the liquid space in the end positions of the gating piston and vice versa. The disadvantage is that the thickened seals exhibit considerable frictional force, as a result of which there is a loss of energy during the movement of the piston. In addition, such seals are rapidly worn during operation, which adversely affects the lifetime and functional quality of the hydropneumatic accumulator. Another disadvantage is that due to the high frictional force and the high mass of the shielding piston, the pressure fluctuation in the hydraulic circuit on which the accumulator is connected increases.

The above-mentioned disadvantages are eliminated by a hydrostatic accumulator with a floating silicon piston consisting of a cylindrical body which is closed by an upper and lower lid and in which the slidable recessed deflecting piston separates the gas space from the liquid space according to the invention. The present invention relates to a first annular sealing surface and a second annular guide surface formed in the upper portion of the first annular sealing surface, the first annular sealing surface being provided in the upper portion of the sealing piston, wherein the liquid annular surface a second ring seal is placed at the bottom. In an alternative embodiment, a third annular guide surface is formed between the first and second annular guide surfaces, in which a seal may be provided in addition to the slight pre-stress. By providing only the annular guide surfaces in the cylindrical body of the accumulator and virtually floating the working fluid level, the energy loss of the piston decreases practically to a minimum as the piston moves, which has a beneficial effect on increasing the service life and the functional quality accumulator.

In the accompanying drawing, an exemplary embodiment of a hydropneumatic accumulator with a floating plunger is shown schematically.

The hydropneumatic accumulator consists of a cylindrical body 1 which is closed by an upper lid 9 and a lower lid 10 and in which a deflecting piston 2 is mounted.

The deflection piston 2 separates the gas space 13 connected to the first opening 11 formed in the upper lid 9, from the fluid space 14 connected to the second opening 12 formed by the lower lid 10. In the upper lid 9 there is a first annular seal 3 placed on the gas space 13 and from the fluid space side 14, a second intermediate ring 4 is disposed in the lower part 10. A gas 15 is provided on the side of the gas chamber 13, and a first annular guide surface 5 and a second annular guide surface 6 are formed on the circumference of the gate piston. the circumference of the cylindrical body 1 and the outer periphery of the first and second annular guide surfaces 5, 6 must be chosen so that it does not close off at the working fluid boundary temperatures. If desired, a third annular guide surface 7 is formed between the first and second annular guide surfaces. However, the gap between the outer circumference of the annular guide surface 7 and the inner circumference of the cylindrical body 1 may be greater than in the case of the first and second annular guide surfaces. If it is desired to completely separate the gas space 13 from the liquid space 14, a seal 8 is inserted into the third annular guide surface 7 with a moderate pretensioning, preferably a slanted ring or seal "Z". The seal 8 does not leak, but only serves to limit the liquid-gas gap.

During operation, the deflecting piston 2 floats on the working fluid level. The pressure above the deflecting piston is equal, with the contact surface between the gas and the working fluid being minimal. If the pressure in the liquid chamber 14 is increased, the instantaneous gate piston 2 starts to move upward. Due to short-term! Also, a working fluid flows through the gap between the second annular guide surface 6 and the wall of the cylindrical body 1 through the pressure difference. However, as the deflecting piston 2 moves in this direction, it is at least or no flow. When the pressures in the gas and liquid compartments 13, 14 are equalized, the stoppings 2 stop. When the pressure in the liquid space 14 decreases, the deflecting piston 2 starts to move downwards and flow in the same direction through the gap between the cylindrical body 1 and the second If such a pressure drop is too high, then the annular seal 4 and the second opening 12 will be provided for the lower face of the deflecting piston 2, thereby preventing further pressure drop in the gas space 13 and in the liquid space 14, wherein the pressure upstream and downstream of the first and second annular guide surfaces 5, 6 remains the same. Analogically, with the high pressure rise in the liquid chamber 14, the upper barrier piston 2 abuts the first annular seal 3 and closes the first opening 11.

Claims (3)

SUBJECT Hydropneumatic accumulator with a floating damper piston, consisting of a cylindrical body which is closed by an upper and lower lid and in which a removable damper piston separating the gas space from the liquid space is displaceable, characterized in that it is in the gas space side (13). a first annular seal (3) is disposed in the upper lid (9) and a first annular guide surface (5) as well as a second annular guide is formed along the outer periphery of the damper piston (2) INVENTION the surface (6), wherein a second annular seal (4) is located at the lower lid (10) from the liquid compartment side (14). Hydropneumatic accumulator according to Claim 1, characterized in that a third annular guide surface (7) is provided between the first and second annular guide surfaces (5), (6), Hydropneumatic accumulator according to claim 1 and 2, characterized in that a gasket (8) is disposed with a slight bias in the friction ring guide flat (7).