EP4416394A1 - Zylinderentgasungseinheit und arbeitszylinder - Google Patents
Zylinderentgasungseinheit und arbeitszylinderInfo
- Publication number
- EP4416394A1 EP4416394A1 EP21806966.4A EP21806966A EP4416394A1 EP 4416394 A1 EP4416394 A1 EP 4416394A1 EP 21806966 A EP21806966 A EP 21806966A EP 4416394 A1 EP4416394 A1 EP 4416394A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- annular chamber
- air space
- residual
- degassing unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7052—Single-acting output members
Definitions
- the invention relates to a cylinder degassing unit for venting a working cylinder and a working cylinder with such a cylinder degassing unit.
- an air exchange hole is provided, for example, which connects the empty movement space with the surrounding atmosphere.
- such an air exchange hole is provided with a functional element, for example, so that no outside air and the contamination associated with it pass into the empty movement space of the cylinder during the changing piston movements.
- the object of the invention is to provide a cylinder degassing unit with which ventilation of the residual cylinder space of a working cylinder can be provided in a structurally simple, cost-effective, particularly reliable manner and adaptively for different parameters. Furthermore, it is the task to show a working cylinder with such a cylinder degassing unit
- the cylinder degassing unit has, as basic components, a base body, an inner discharge section, an annular chamber and a discharge section.
- the cylinder degassing unit is designed as a compact, modular component. Typically, the cylinder degassing unit is used to vent piston chambers in lifting or pulling cylinders.
- the cylinder degassing unit is based on the fact that there is a residual cylinder air space in a working cylinder that is not acted upon by a hydraulic pressure medium and whose volume changes as a result of the stroke movement of the piston of the working cylinder.
- a wall perforation is formed on the working cylinder, which provides a connection, routed via the cylinder degassing unit, between a cylinder residual air space and the outside atmosphere.
- the base body is used for a fixed arrangement on a hydraulic working cylinder, also referred to below as working cylinder for short. When used as intended, the base body is arranged at least in sections in the wall perforation of the working cylinder.
- the base body has a concave contour which preferably forms the annular chamber in the form of a circumferential annular gap or a circumferential annular groove.
- the concave contour is preferably designed as a reduction in diameter of the base body and, together with the inner surface of the wall perforation, forms a circumferential cavity that provides the annular chamber.
- the volume of the annular chamber controls the volume of air that can be stored and the volume of air that can be discharged.
- the annular chamber assumes the function of a pressure chamber.
- the inner discharge section has an inner discharge channel and an inner elastomeric annular body.
- the inner drainage channel is arranged in the base body and can be provided in particular as a bore.
- the inner diversion channel connects the residual cylinder air space with the annular chamber.
- the inner diversion channel has an inner inlet at one end, arranged on the residual cylinder air space.
- At the other end of the inner discharge channel is an intermediate outlet at the annular chamber.
- the inner elastomeric annular body covers the intermediate outlet and is prestressed.
- the inner elastomeric annular body is designed to form a first pressure barrier in a discharge direction and a second sealing plane in an inlet direction.
- the outer lead-out section is constructed similarly to the inner lead-out section. It is also arranged in the base body and has an outer discharge channel and an outer elastomeric annular body.
- the outer discharge channel connects the annular chamber with the outside atmosphere.
- the preferably inclined outer discharge channel has an intermediate inlet at the cylinder residual air space at a first end and an outer outlet to the outside atmosphere at its opposite end.
- the outer elastomer ring body covers the outer outlet.
- the outer elastomeric annular body is also prestressed and is designed to form a second pressure barrier in the discharge direction and a first sealing plane in the inlet direction. When the second pressure barrier is overcome, the discharge medium escapes into the low-pressure area of the atmosphere.
- the diversion direction is understood to mean the direction from the inside to the outside, that is to say from the cylinder residual air space in the direction of the outside atmosphere.
- the diversion direction describes the possible path of a diversion medium out of the residual cylinder air space into the outside atmosphere.
- the direction opposite to the outlet direction is understood to be the inlet direction.
- the discharge medium is in particular gaseous media such as air or gases that are outgassed from the hydraulic pressure medium as a result of the pressure differences, or in some cases also hydraulic pressure medium that is stripped off on the inner surface of the working cylinder as a result of the piston movement or as a leakage flow in smaller quantities into the residual cylinder air space can reach or to condensates.
- the discharge medium is sometimes also referred to as gas or air.
- the sealing levels make it possible to subdivide a high-pressure area in the residual cylinder air space and the inner discharge channel, a medium-pressure area after the inner elastomeric annular body in the annular chamber and the outer discharge channel up to the outer annular body, and then a low-pressure area in the outside atmosphere.
- the material hardness, the prestress after being pulled onto the base body and the wall thickness of the respective elastomer ring body as well as the opening cross section of the intermediate outlet or the outer outlet define the pressure required for the discharge medium to flow out.
- the inner elastomeric annular body expands and allows the drainage medium to escape into the annular chamber. Due to the closing force given by the preload, a defined pressure also remains in the residual cylinder air space after the outflow.
- the outer outlet When the minimum pressure is reached, the outer elastomeric ring expands and the outer outlet is released. The gas can escape from the intermediate space to the atmosphere via the outer discharge channel and the outer outlet.
- the preload of the outer elastomer ring body defines the residual pressure from which it closes the outer outlet. In this way, a defined pressure can be maintained in the annular chamber, also referred to here as the medium-pressure area.
- the air distribution module is also designed according to the invention to have a full discharge operating state, a partial discharge operating state and a closed operating state.
- the full discharge operating state there is an overpressure in the residual cylinder air space compared to the outside atmosphere. This overcomes the first and the second pressure barrier and leads to media discharge of the discharge medium from the remaining air space in the cylinder via the inner discharge section, the annular chamber and the outer discharge section into the outside atmosphere.
- the graded pressure conditions described consisting of high pressure in the residual cylinder space, medium pressure in the annular chamber and low pressure in the outside atmosphere.
- a two-stage diversion path firstly from the cylinder residual air space into the annular chamber and then secondly from there into the atmosphere, is provided with two barrier-forming elastomeric annular bodies.
- This achieves a lock function.
- the residual cylinder air space is not directly connected to the cylinder environment. This in turn leads to increased protection of the remaining cylinder air space against the harmful effects of the atmospheric environment. Dirt- Particles, harmful gases or aerosols are held off in two stages and cannot penetrate the cylinder and damage it.
- the annular chamber is already shielded from contamination by the outer discharge section, so that the inner elastomeric ring in particular is particularly protected and its functionality is not impaired even under problematic conditions in the outside atmosphere.
- the defined residual pressure in the annular chamber made possible by the invention is also advantageous. Several advantageous effects can be achieved particularly advantageously by the residual pressure in functional integration.
- the residual pressure is a stage of an advantageous pressure cascade, this providing an intermediate pressure level between a possible maximum pressure in the cylinder residual air space and a merely atmospheric pressure in the outside atmosphere.
- the total pressure difference is advantageously divided into two stages.
- the residual pressure supports the sealing effect of the inner piston ring in its closed operating state.
- the structural simplicity is also advantageous.
- the base body can be provided in a simple manner as a turned/milled part.
- the elastomeric ring bodies can be designed as simple hose sections or rubber rings. This is accompanied by the advantage of particular robustness.
- the ring bodies can be easily replaced and renewed if necessary.
- the base body can advantageously be arranged in a wall perforation in such a way that it protrudes axially with the outer discharge section so that the outer elastomeric ring body, which is potentially subject to greater stress from environmental influences, can be replaced from the wall perforation without dismantling the cylinder degassing unit and preferably even without tools.
- the base body has a cylindrical basic shape and is accommodated in a wall perforation of the residual cylinder air space designed as a hollow cylindrical bore.
- the base body can advantageously be designed with an external thread which engages in a corresponding internal thread of the wall perforation of the working cylinder.
- other connections are also possible, for example as a press fit.
- the inner elastomeric annular body and the outer elastomeric annular body are of identical design.
- the annular chamber is formed by the concave contour of the base body and an inner surface of the wall perforation.
- the concave contour of the base body can be produced inexpensively and easily, preferably by turning. However, it is also possible to mill out a non-radially symmetrical concave contour.
- the geometric design of the concave contour of the base body defines the shape and volume of the annular chamber in conjunction with the generally cylindrical inner shell. In this way, the pressure conditions and the flow behavior can be influenced in a targeted manner.
- the annular chamber is designed for an overpressure compared to the outside atmosphere in the closed operating state.
- the overpressure creates a lock function in the annular chamber.
- the ingress of dirt or otherwise contaminated air is prevented by the permanent overpressure.
- the overpressure of the annular chamber remains during a stroke movement of the piston and in every possible piston position as well as in every possible pressure condition of the cylinder residual air space.
- the overpressure in the annular chamber prevents outside air and dirt from entering the annular chamber and supports the sealing effect of the inner elastomeric annular body in its function as a second sealing level.
- the cylinder degassing unit has an inner O-ring, which is designed for sealing contact with the wall perforation and forms a sealing plane between the residual air space in the cylinder and the annular chamber.
- the cylinder degassing unit has an outer O-ring, which is designed for sealing contact with the wall perforation and forms a sealing plane between the annular chamber and the outside atmosphere.
- the cylinder degassing unit has a further inner discharge section and a further annular chamber which are functionally arranged in series with the inner discharge section and the annular chamber.
- the further training is based on a further special advantage that the multi-level can be further expanded with a third or further level.
- further pressure stages can be connected in series in the cylinder degassing unit.
- damping, noise generation and the behavior of the outflowing gases can be controlled and further improved.
- the pressure difference to be applied between the respective pressure levels is advantageously lowered with the same total pressure difference between the residual cylinder air space and the outside atmosphere.
- Another aspect of the present invention relates to a working cylinder.
- This has a residual cylinder air space, which is assigned a wall perforation that provides penetration.
- this working cylinder according to the invention has a cylinder degassing unit according to the invention, which is arranged on the wall perforation.
- the cylinder degassing unit is designed according to one of Claims 1 to 8.
- the working cylinder according to the invention is advantageously designed as a single-acting hydraulic working cylinder which is actuated by a fluid in only one working direction.
- the empty movement space delimited by the piston with its piston seal forms the remaining air space in the cylinder.
- the empty movement space is, for example, the piston space in the case of a pull cylinder and the piston rod space in the case of a pressure cylinder. Otherwise, the working cylinder is designed in a manner known per se.
- FIG. 1 schematic sectional view of the working cylinder
- FIG. 2 Schematic sectional view of the cylinder degassing unit explained in more detail.
- Figure 1 shows a schematic sectional view of an embodiment of the working cylinder 8 with the installed cylinder degassing unit 7.
- the working cylinder 8 is a hydraulic pulling cylinder.
- This has a lateral pressure medium connection in the cylinder wall, through which pressure medium can be applied to the piston rod chamber.
- the annular surface of the piston facing the guide closure part is subjected to pressure and the piston with the coupled piston rod performs an inward stroke movement.
- the residual cylinder air space is not acted upon by the pressure medium but remains empty.
- the volume of the residual cylinder air space 5 changes.
- the cylinder degassing unit 7 is placed with a connection to the residual cylinder air space 5 in the exemplary embodiment in a widened section of the wall perforation 5.1 designed as a bore, which is assigned to the residual cylinder air space 5 and forms a uniform pressure space with it. Due to this arrangement, the cylinder degassing unit 7 of the residual cylinder air vent chamber 5 with a retracting piston movement.
- Cylinder degassing unit 7 is shown in Fig. 2 below
- Figure 2 shows the cylinder degassing unit 7 in a schematic sectional view.
- This consists of the base body 1, an inner discharge section 2 and an outer discharge section 4. Furthermore, the annular chamber 3 is formed by the concave contour 1.1 of the base body 1.
- the inner diversion section 2 When installed as intended, the inner diversion section 2 is arranged in the wall perforation 5.1 of the working cylinder designed as a bore and is pressure-connected with its inner diversion channel 2.1 to the residual cylinder air chamber 5.
- the inner diversion channel 2.1 begins with the inner inlet 2.3 at the residual cylinder air chamber 5 at the bore and leads to the intermediate outlet 2.4, with which it leads into the annular chamber 3.
- the intermediate outlet 2.4 is covered by the inner elastomer ring body 2.2, which in the exemplary embodiment is designed as a stretched rubber ring or plastic ring with a flat cross section.
- the sealing and pressure separation between the remaining cylinder air space 5 and the annular chamber 3 is achieved in the exemplary embodiment by the inner O-ring 9.
- the outer discharge section 4 is designed analogously and consists of the outer discharge channel 4.1 and the outer elastomeric annular body 4.2. Designed as a bore, the outer discharge channel 4.1 penetrates the base body 1.
- the inner discharge channel 4.1 has a pressure connection to the annular chamber 3 with the intermediate inlet 4.3 and ends in the discharge direction with the outer outlet 4.4 on the outer elastomeric annular body 4.2 and thus leads to the outside atmosphere 6, which is not part of the device according to the invention.
- the hydraulic pressure medium is fed into the piston rod chamber, where it moves the piston in the direction of the piston head.
- the volume in the piston chamber decreases and the pressure of a discharge medium collected there increases.
- the piston space is the remaining air space in the cylinder 5.
- the annular chamber 3 is a circumferential cavity which is formed by the concave contour 1.1 of the base body 1 and by the wall of the bore, shown here schematically by the vertical dashed lines .
- the intermediate outlet 2.3 is closed by the inner elastomeric annular body 7 and the inner elastomeric annular body 7 only opens above a certain pressure.
- the annular chamber 3 is filled with the discharge medium due to the pressure difference.
- the gases then flow into the outer discharge section 4.
- the gases flow into the outer discharge channel 4.1 via the intermediate inlet 4.3.
- the outer outlet 4.4 is closed by the outer elastomeric annular body 4.2. This also opens at a certain pressure of the gas and allows it to flow out into the outside atmosphere, the low-pressure area.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DE2021/000169 WO2023061522A1 (de) | 2021-10-12 | 2021-10-12 | Zylinderentgasungseinheit und arbeitszylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4416394A1 true EP4416394A1 (de) | 2024-08-21 |
| EP4416394B1 EP4416394B1 (de) | 2025-08-13 |
Family
ID=78621592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21806966.4A Active EP4416394B1 (de) | 2021-10-12 | 2021-10-12 | Zylinderentgasungseinheit und arbeitszylinder |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US12297849B2 (de) |
| EP (1) | EP4416394B1 (de) |
| JP (1) | JP7749818B2 (de) |
| CN (1) | CN118119773A (de) |
| DE (1) | DE112021008353A5 (de) |
| WO (1) | WO2023061522A1 (de) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE124827C (de) | ||||
| DE1158784B (de) | 1960-03-22 | 1963-12-05 | Nuquip Ltd | UEberdruckventil |
| JPS5043761Y1 (de) * | 1972-09-06 | 1975-12-15 | ||
| DE2419118A1 (de) * | 1974-04-20 | 1975-11-13 | Hubert Fussangel | Stufenlos verstellbarer stossdaempfer, insbesondere fuer industrielle anwendungszwecke |
| YU111876A (en) | 1975-08-22 | 1982-06-30 | Gelenkwellenbau Gmbh | Ventilating valve for removing air from the inside of elements of a universal joint shaft, which are telescopically shiftable one into another |
| FR2674376B1 (fr) * | 1991-01-25 | 1994-11-04 | Joel Huitric | Soupape pour batteries etanches. |
| GB9111327D0 (en) * | 1991-05-24 | 1991-07-17 | Pall Corp | Automatic bleed valves |
| DE19820578C5 (de) * | 1998-05-08 | 2008-08-14 | Zf Sachs Ag | Geber-oder Nehmerzylinder einer hydraulischen Betätigungseinrichtung |
| DE10155793B4 (de) | 2000-11-17 | 2013-09-19 | Schaeffler Technologies AG & Co. KG | Hydraulisches System |
| DE202005003835U1 (de) * | 2005-03-10 | 2005-05-04 | Abertax Research And Development Ltd. | Entgasungsventil für Batteriezellen |
| DE102008041115A1 (de) | 2008-08-08 | 2010-02-11 | Zf Friedrichshafen Ag | Hydraulisches Betätigungssystem für eine Kraftfahrzeugkupplung mit einer Entlüftungseinrichtung |
| DE202011102288U1 (de) | 2011-06-24 | 2011-11-30 | Bümach Engineering International B.V. | Gasaustauschsperre für druckmittelbetriebene Verbraucher |
| DE102015218058B4 (de) | 2015-09-21 | 2017-09-14 | Festo Ag & Co. Kg | Pneumatisches Antriebssystem mit Entlüftungseinrichtung |
| CN211314725U (zh) * | 2019-08-29 | 2020-08-21 | 苏州金维克液压动力设备有限公司 | 一种用于液压缸的排气装置 |
-
2021
- 2021-10-12 CN CN202180103203.1A patent/CN118119773A/zh active Pending
- 2021-10-12 JP JP2024517409A patent/JP7749818B2/ja active Active
- 2021-10-12 US US18/697,498 patent/US12297849B2/en active Active
- 2021-10-12 WO PCT/DE2021/000169 patent/WO2023061522A1/de not_active Ceased
- 2021-10-12 DE DE112021008353.8T patent/DE112021008353A5/de active Pending
- 2021-10-12 EP EP21806966.4A patent/EP4416394B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024536032A (ja) | 2024-10-04 |
| US20240410403A1 (en) | 2024-12-12 |
| US12297849B2 (en) | 2025-05-13 |
| WO2023061522A1 (de) | 2023-04-20 |
| DE112021008353A5 (de) | 2024-07-25 |
| JP7749818B2 (ja) | 2025-10-06 |
| CN118119773A (zh) | 2024-05-31 |
| EP4416394B1 (de) | 2025-08-13 |
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