阅读说明：本技术 具有脱气装置的压力室 (Pressure chamber with degasser ) 是由 B·阿诺尔德 N·恩格莱特 于 2020-09-29 设计创作，主要内容包括：本发明公开了一种静液压的压力室,其具有连接在其最高部位处的脱气装置。该脱气装置通过节流部与储箱或者与液压系统的无压力的泄漏区域连接,在该无压力的泄漏区域中布置有待脱气的压力室。(The invention discloses a hydrostatic pressure chamber with a degassing device connected at its highest point. The degassing device is connected via a throttle to a tank or to a pressure-free leakage region of the hydraulic system, in which a pressure chamber to be degassed is arranged.)

1. Pressure chamber (1) having at least one high point (2 a, 2 b) to which a degassing device (2) is connected, wherein a pressure-free connection (12, 13) to a tank (T) can be established or established via the degassing device (2), and wherein the degassing device has a volume flow restriction.

2. Pressure chamber with degassing device according to claim 1, wherein the volume flow restriction means is formed by a constant restriction (10).

3. Pressure chamber with degassing device according to claim 2, wherein an internal leak back means is connected on the output of the constant restriction (10).

4. Pressure chamber with degassing device according to claim 3, wherein the internal leak-back means are formed by channels (13) in the wall (6) of the pressure chamber (1).

5. Pressure chamber with degassing device according to claim 3 or 4, wherein a further constant throttling (16) is arranged in the internal leakage return device.

6. Pressure chamber with degassing device according to claim 2, wherein a supplementary suction valve (18) is arranged parallel to the constant restriction (10).

7. Pressure chamber with degassing device according to claim 1, wherein the volume flow limiting device has a shut-off valve (14).

8. The pressure chamber with degassing device according to claims 2 and 7, wherein said constant restriction (10) is arranged between said pressure chamber (1) and said shut-off valve (14).

9. The pressure chamber with degassing device according to claim 7 or 8, wherein the shut-off valve (14) is pretensioned into the closed position (b) by a spring, and wherein the shut-off valve (14) can be switched into the open position (a) by an actuator.

10. Pressure chamber with degassing device according to claim 9, wherein said shut-off valve (14) has a non-return valve by means of which the connection from the pressure chamber (1) to the tank (T) is interrupted in the closed position (b).

Technical Field

The invention relates to a pressure chamber with a degassing device, which can be filled or filled with a pressure medium in liquid form.

Background

A problem with the operation of hydraulic systems is that the liquid pressure medium, mostly hydraulic oil, is not in the tank for a sufficiently long time to be completely degassed. The pressure medium is therefore usually degassed in the hydraulic system, wherein gas, usually air, collects at the high points of the non-flow or at the rear cut (hinderschneidung) of the non-flow pressure chamber.

By this air accumulation, adverse effects, such as cavitation or self-ignition (diesel effect), can occur during highly dynamic pressure changes in the pressure chamber.

At the internet link address:an automatic ventilation device is disclosed below, which enables continuous ventilation of the clamping head (Klemmkopf), in particular hydraulic clamping head. For this purpose, an automatic ventilation device is arranged above the line or above the clamping head. In operation of the clamping head, the automatic ventilation device uses the difference in viscosity between the hydraulic oil and the air collected on the automatic ventilation device.

A disadvantage of such automatic ventilation devices is that they are not suitable for highly dynamically loaded pressure chambers.

Disclosure of Invention

In contrast, the object of the present invention is to provide a pressure chamber with a degassing device, which is suitable for highly dynamic pressure changes.

This object is achieved by a pressure chamber with a degassing device having the features of claim 1.

Further advantageous embodiments of the invention are described in the dependent claims.

The claimed pressure chamber has at least one high point (Hochpunkt) through which little or no liquid pressure medium, for example hydraulic oil, flows. The degassing device is connected to one high point or to a plurality of high points. A pressure-free connection to the tank can be formed or established by the degassing device. The degassing device has a volume flow limiting device in order to keep the leakage of the pressure medium through the degassing device as small as possible. The pressureless connection may be direct or indirect. The pressure chamber with the degassing device is suitable for high dynamic pressure changes.

This indirect variant of the pressure-free connection can be guided, for example, by a region inside the housing, in which the pressure chamber is also accommodated.

The volume flow limitation device can be formed simply from a constant throttle (konstantdessel) or have such a constant throttle in terms of device technology. The constant restriction may be incorporated into a wall portion of the housing.

In one embodiment, an internal leakage return device is connected to the output of the constant throttle. The internal leak-back means can be formed by a channel in the wall of the housing.

A further constant throttle can be arranged in the internal leakage return device. The further constant restriction may be incorporated in a wall portion of the housing.

In one embodiment, a supplementary suction valve (nachsaugmententil) is arranged parallel to the constant throttle. Preferably, the supplementary suction valve is formed by a check valve loaded by a spring, the opening direction of which is directed from the tank to the pressure chamber.

In one embodiment, the volume flow restriction means is formed by a shut-off valve.

In one embodiment, the volume flow limitation device has a shut-off valve in addition to the constant throttle.

The shut-off valve is preferably biased into the closed position by a spring and can be switched into the open position by an actuator.

The shut-off valve may have a non-return valve by means of which the connection from the pressure chamber to the tank is interrupted in the closed position of the shut-off valve. Thus giving a supplementary suction function.

The shut-off valve can be designed as a seat valve which, in the closed position, shuts off the connection from the pressure chamber to the tank without leakage.

The shut-off valve can be designed as a quick-acting on-off valve in order to achieve a brief degassing during brief operational pauses of the system or the pressure chamber in order to thus minimize the power loss of the system.

Drawings

In the figures, several embodiments of a pressure chamber with a degassing device according to the invention are shown. In which is shown:

figure 1 shows a first embodiment of a pressure chamber with a degassing device according to the invention,

figure 2 shows a second embodiment of a pressure chamber with a degassing device according to the invention,

FIG. 3 shows a third embodiment of a pressure chamber with a degassing device according to the invention, and

fig. 4 shows a fourth embodiment of a pressure chamber with a degassing device according to the invention.

Detailed Description

Fig. 1 to 4 each show an annular hydraulic pressure chamber 1 for a liquid pressure medium, for example hydraulic oil, which extends rotationally symmetrically with respect to a longitudinal axis 4. The radially outer wall 6 of the pressure chamber 1 has a radial constriction, so that two radially enlarged regions are produced. These two radially enlarged regions form their high points 2a and 2b, through which the pressure medium does not flow or hardly flows, due to the horizontal arrangement of the longitudinal axis 4 of the pressure chamber 1.

The two high points 2a and 2b are degassed, in particular ventilated, via respective lines which are formed as respective channels in the wall 6. The volume flow restriction device according to the invention is arranged downstream and above the junction (zusmammenfufung) 8 of the two channels.

According to fig. 1, the volume flow restriction is formed by a constant restriction 10. Downstream of the junction 8, a line 12 is connected, which leads pressureless to the tank T. Since the gas always collects in the pressure chamber 1 above, i.e. in the two high points 2a, 2b, the gas escapes to the tank T. In order to keep the leakage and thus the power loss as low as possible, a constant throttle 10, which limits the volume flow, is installed in the line 12.

According to fig. 2, the volume flow limitation is formed by a constant restriction 10 and a shut-off valve 14. The degassing device corresponds to the degassing device of the first embodiment in fig. 1 with the difference that a shut-off valve 14 is also installed between the constant throttle 10 and the tank T, which shut-off valve is designed as a quick-switching valve. The shut-off valve is opened by means of its actuator only during suitable time periods of the working cycle, thereby further reducing the power loss and ensuring functionality in (leakage) critical processes.

According to fig. 3, the volume flow limitation is formed by a constant throttle 10, to the output of which a line 13 is connected, which forms an internal leakage return device that is directly returned to a pressure-free leakage region 15 of the system. A constant restriction 16 is also installed in the line 13 in order to limit leakage.

According to fig. 4, the volume flow limitation is formed by the constant restriction 10 and the supplementary suction valve 18. Downstream of the junction 8, a constant throttle 10 is arranged in parallel with a supplementary suction valve 18, which is designed as a check valve and blocks the throughflow out of the pressure chamber 1. Downstream of the two elements 10, 18, the lines are again connected in the direction of the tank T via a junction 20. A dead volume 22 for pressure medium is located at the junction 20. The dead volume 22 is connected pressureless to the tank T and is limited to a geometrically predefined pressure medium volume.

As long as the pressure in the pressure chamber 1 is greater than the tank pressure, the volume flow is discharged to the tank T via the constant throttle 10, analogously to the first exemplary embodiment, and the pressure chamber 1 is kept free of gas. If an undesired underpressure occurs in the pressure chamber 1, pressure medium can be sucked from the dead volume 22 into the pressure chamber 1 via the supplementary suction valve 18. The negative pressure can thereby be limited or reduced.

The invention relates to a hydrostatic pressure chamber (1) having a degassing device connected to the highest point (2 a, 2 b) thereof. The degassing device is connected via a throttle 10 to a tank or to a pressure-free leakage region 15 of the hydraulic system, in which leakage region the pressure chamber 1 to be degassed is arranged.

List of reference numerals

1 pressure chamber

2a, 2b high point

4 longitudinal axis

6 wall part

8 confluence part

10 constant throttle

12 pipeline

13 channel

14 stop valve

15 leakage area

16 another constant restriction

18 supplementary suction valve

20 confluence part

22 volume of dead space

a open position

b closed position

T storage tank.