• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention concerns a filter (5) for a return line (L1, L2) for hydraulic oil to a hydraulic tank (2), which filter (5) comprises a filter element (11). According to the invention, the filter (5) is arranged to filter the hydraulic oil through the filter element (11) when the hydraulic oil lies below a first oil level (H1) in the filter (5), and the filter (5) comprises an arrangement (15) to lead the hydraulic oil past the filter element (11) when the oil level (H) in the filter (5) exceeds the first oil level (H1).
    公开号:SE0950893A1
    申请号:SE0950893
    申请日:2009-11-24
    公开日:2011-05-25
    发明作者:Anders Nydahl
    申请人:Atlas Copco Rock Drills Ab；
    IPC主号:
    专利说明:

    20 25 2 the hydraulic tank and its leakage connections, without passing the return filter of the hydraulic tank.
    A problem with known technology is that the hydraulic oil from the back pressure sensitive hydraulic components does not pass any return filter and that the hydraulic oil is thus not filtered. It means b | .a. that particles from e.g. the hydraulic pump's plain and roller bearing goes directly to the hydraulic tank without being filtered. The particles then follow with the hydraulic oil back into the hydraulic system and to the various hydraulic components included and generate additional particles through wear, with malfunctions and abnormal wear as a result. An overhaul of the hydraulic system after a pump failure is extensive. It is also difficult to obtain complete elimination of the particles distributed in the hydraulic system without replacing the respective hydraulic component. In the worst case, residual particles will also cause future problems in the hydraulic system.
    DISCLOSURE OF THE INVENTION According to one aspect of the invention, there is provided a filter having the features of claim 1.
    The advantage is that filtration is performed without the filter causing any significant back pressure even in the event of temporarily high leaks of hydraulic oil, since a level-based bypass function can be used in the filter. Thus, the filter can be used for hydraulic components that are sensitive to back pressure. The invention would e.g. in the event of a bearing failure in a hydraulic pump, catch the particles from the breakdown that have been transported from the hydraulic pump's leak line to the hydraulic tank. These particles could otherwise be sucked into the hydraulic pump and thus further damage the hydraulic pump, as well as redistribute it in the hydraulic system and damage other hydraulic components. The invention minimizes the consequential damage after a pump failure and thus also the extent of the hydraulic system's decontamination. DESCRIPTION OF THE DRAWINGS The invention will now be explained in more detail with the aid of a preferred exemplary embodiment and with reference to the accompanying drawings, in which Fig. 1 shows an overview view of a known hydraulic system in a drilling rig.
    Fig. 2 shows an overview view of a hydraulic system in a drilling rig according to the invention. Fig. 3 shows a cross-section of a filter according to an embodiment.
    PREFERRED EMBODIMENT Fig. 1 shows an overview view of a known hydraulic system 1 comprising a number of different hydraulic components in a drilling rig with at least one drilling machine.
    The hydraulic system 1 is connected to a hydraulic tank 2. One or more hydraulic pumps 3 pump hydraulic oil via one or more suction oil lines S from the hydraulic tank 2 to the hydraulic pump 3 and via one or more pressure lines P from the hydraulic pump 3 to the hydraulic system 1. Most hydraulic oil then returns via one or fl your first return lines T1, T2 from the hydraulic system 1 to a first return filter 4 and from the first return filter 4 to the hydraulic tank 2. The first return filter 4 may be of a conventional type with pressure-based bypass function 6, which means that if the pressure becomes too high in the first return filter 4, the oil in the first return lines T1, T2 is led past the first return filter 4.
    Some hydraulic components, in particular hydraulic pumps 3, are sensitive to the back pressure that a conventional return filter 4 with pressure-based bypass function 6 can cause. This is especially true in a drilling rig, where often a so-called full fl fate filter is used as return filter 4, at the same time as the return flow of hydraulic oil can be at 200-600 I / min, which is the reason why a relatively high back pressure can be created. The back pressure-sensitive hydraulic components 3 therefore have a return connected directly to the hydraulic tank 2 via other return lines L1, L2 without a conventional return filter 4. These are usually leakage oil flows.
    Fig. 2 shows an overview view of a hydraulic system in a drilling rig according to the invention where one or more second return filters 5 are arranged to the other return lines L1, L2 and with another or more other return lines L3 between the second return filter 5 and the hydraulic tank 2. The second return filter 5 has a level-based bypass function which will be described in more detail by an embodiment below. In practical terms, the second return filter 5 can be integrated in the hydraulic tank 2 or be separate from the hydraulic tank 2.
    Fig. 3 shows an embodiment of the second return filter 5. The second return filter 5 comprises a filter container 11, one or more filter elements 12, one or more inlets 13 into the filter container 11, one or more outlets 14 from the filter container 11 and one or more openings 15. The filter element 12 is arranged for oil filtration between inlet 13 and outlet 14. The opening 15 is arranged as a filtration-free passage between inlet 13 and outlet 14.
    The filter element 12 can look different. The most common model of filter element 12 may be a straight wall between the inlet 13 and the outlet 14 with an opening 15 in the form of an open area above. However, the greatest advantage is obtained with a cylindrical filter element 12, since it has the largest filtration area. To further increase this filtration area, it is advantageous to have a wavy edge on the filter element 12. The filter element 12 should be so fine that it catches as many particles as possible, but not so fine that the flow through the filter element 12 becomes too slow. A suitable filter coarse size can be e.g. 100 pm absolutely.
    In Fig. 3 it is shown that the inlet 13 of the second return filter 5 is arranged on the outside of a cylindrical filter element 12, while the outlet 14 is arranged on the inside of the filter element 12 for filtration from the outside in, but it is equally possible to change the location of the inlet 13 and outlet 14, so that filtration instead takes place from the inside out.
    Hydraulic oil from the return lines L1, L2 of the back pressure sensitive hydraulic components is led into the filter container 1 via the filter container inlet 3. The hydraulic oil does not normally come in an even flow, but the flow can vary greatly over time.
    When the oil volume of the filter container 11 is filled with unfiltered hydraulic oil 16, an oil level H of unfiltered hydraulic oil 16 increases. 15 20 25 30 5 The ratio between the inlet of the unfiltered hydraulic oil 16 in the filter tank 11 and the outflow of the filtered hydraulic oil 17 from the filter tank 11 determines the volume of the unfiltered hydraulic oil 16 and thus the oil level H. in the event of a sudden change in the displacement of the hydraulic pump 3, the oil level H is raised and the free air volume 18 above the hydraulic oil 16, 17 is reduced. The filter construction then accumulates the short-term volume increases in the filter container 11 and performs full filtration without creating any significant back pressure in the leakage lines L1, L2.
    Full filtration is obtained as long as the increasing input creates an oil level H which is lower than a first level H1 corresponding to the height of the filter element 12 to the opening 15. If the inflow is further increased, the excess of the incoming unfiltered hydraulic oil 16 is passed through the filter element opening 15 and beyond. via the outlet 14 of the filter container 11 out to the hydraulic tank 2, without being filtered and without creating any significant back pressure. A filter 5 with a level-based bypass function has then been obtained, instead of with a conventional pressure-based bypass function.
    The filter container 11 can advantageously be transparent, so that it is easy to see what is happening in the filter. Even better is to install a level sensor 19, e.g. electric, for measuring the oil level H. If the oil level H in the filter tank exceeds the first level H1, which is the limit for full filtration, the system can alarm and / or switch off the necessary components - for a drill probably the entire drill. This is to avoid unfiltered hydraulic oil 16 from the other return lines L1, L2 returning to the hydraulic tank 2. The alarm can then be an indication of the need for filter replacement or filter cleaning.
    If the oil level H continues to rise above the first level H1 and the opening 15 is not sufficient to take care of the inflow of unfiltered oil 16, then the oil level H risks rising to a second level H2 which in Fig. 3 corresponds to the roof 20 of the filter container. Then a pressure will build up in the filter container 11, which will create an undesired back pressure in the leakage lines L1, L2, which risks destroying hydraulic components. The level sensor 19 can then alarm and switch off necessary components. 10 15 20 25 30 6 An alternative can thus be to alarm and switch off already at the first level H1 in order not to allow any appreciable amount of unfiltered oil 16 to pass the filter. Another alternative may be that only alarms occur at the first level H1, while alarms and shut-off occur at the second level H2 to avoid back pressure in the leakage lines L1, L2. A variant of the first alternative may be that the opening 15 is normally closed, but is opened when the level sensor 19 alarms. The latter option can be an advantage in an environment where the filter e.g. exposed to a lot of shaking and unfiltered oil otherwise risks slipping through the opening 15.
    If there is a sudden sharp drop in unfiltered hydraulic oil 16 and the inlet 13 is in the floor 21 of the filter container, the unfiltered hydraulic oil 16 can hit the roof 20 of the filter container, without the filter container 11 being full and thus possibly causing a high level false alarm H1 , H2 and / or that some unfiltered hydraulic oil 16 swims out via the opening 15. Therefore, it may be advantageous to have an obstacle 22 at the inlet 13 which means that the unfiltered hydraulic oil 16 is forced to take a small detour and thus behave more calmly.
    Corresponding obstacles 22 as in Fig. 3 can of course be arranged at the inlet 13 if the inlet 13 is instead located on the inside of the filter element 12 - for filtration from the inside and out or if the inlet 13 e.g. located in the roof 20 or wall 23 of the filter container.
    The air 18 in the filter container 11 affects the outflow of hydraulic oil 17 from the filter container 11. Since the amount of hydraulic oil 16, 17 in the filter container 11 can vary considerably, the air pressure is affected if the filter container 11 is hermetically sealed. For example. the air pressure drops if more hydraulic oil flows out of the filter container 11 than into the filter container 11 and hydraulic oil 16, 17 can therefore get stuck in the filter container 11. To avoid large air pressure changes, the air 18 can be connected to e.g. the air in the hydraulic tank 2 via e.g. a nipple 24. Then the same air pressure is obtained in the filter container 11 as in the hydraulic tank 2, which today is 0-0.2 bar above atmospheric pressure. This means that the flow between the second return filter 5 and the hydraulic tank 2 fl performs better. It is of course possible to equalize pressure in other ways as well. The small back pressure coming from the return filter 5 is mainly caused by two factors: the oil level H in the filter container 11 and the air pressure in the air 18 above the oil.
    Experiments have shown that in a drilling rig, a first level H1 of about 133 mm is sufficient, which would give a back pressure of about 0.01 bar from the oil level. This is negligible in this context. As mentioned above, the air pressure can give a maximum of 0.2 bar back pressure, which would have happened even if the return lines L1, L2 had been connected directly to the hydraulic tank 2 according to conventional technology and which is far below the manufacturers' limit of 0.5 bar.
    Above, it has been described above all how the second return filter 5 is used for leakage oil from e.g. hydraulic pumps 3. However, the second return filter 5 can of course be used for any return oil - including from hydraulic components that can withstand back pressure - only the second return filter 5 is dimensioned accordingly. It is thus also possible to do without the first return filter 4 and let the second return filter 5 take care of all the return oil.
    The invention is of course not limited to the example described above, but can be modified within the scope of the appended claims.
    权利要求:
    Claims (1)
    [1]
    1) 8) Filter (5) for a return line (L1, L2) for hydraulic oil to a hydraulic tank (2), which filter (5) comprises a filter element (11), characterized in that the filter (5 ) (11) when the hydraulic oil is below a first oil level (H1) in the filter (5) and that the filter (5) is arranged to filter the hydraulic oil through the filter element comprises a device (15) for guiding hydraulic oil past the filter element (11) when the oil level (H ) in the filter (5) exceeds the first oil level (H1). Filter according to claim 1, characterized in that the device (15) for guiding hydraulic oil past the filter (5) when a hydraulic oil level in the filter exceeding a maximum oil level is an opening (15) in the filter element. Filter according to any one of claims 1-2, characterized in that the filter (5) further comprises a device (19) for alarming and / or switching off components if the oil level (H) exceeds the first oil level (H1) and / or a second oil level (H2). Filter according to claim 3, characterized in that the device (19) for alarming and / or switching off components comprises a level sensor (19), preferably electric. Filter according to any one of claims 1-4, characterized in that the filter (5) further comprises a device (24) for pressure equalization of air in an air space (18) in the filter (5). Filter according to claim 5, characterized in that the device (24) for pressure equalization of air (18) in an air space (18) in the filter (5) comprises a device for connection from the air space (18) in the filter (5) to a corresponding air space in hydraulic tanks (2). Drilling rig, characterized in that the drilling rig comprises a filter (5) according to any one of claims 1-6. Method for filtering hydraulic oil in a return line by means of a filter (5), characterized by filtering the hydraulic oil if an oil level (H) in the filter (5) 9 falls below a first oil level (H) and passing the hydraulic oil past the filter (5) if the oil level (H) in the filter (5) exceeds the first oil level (H1). Method for filtering hydraulic oil according to claim 8 or 9, characterized by alarming and / or switching off components if the oil level (H) in the filter exceeds the first oil level (H1) and / or a second oil level (H2).
    类似技术:
    公开号 | 公开日 | 专利标题
    JP6624819B2|2019-12-25|Return filter
    JP5635296B2|2014-12-03|Assembly, lubricating fluid filtration assembly, cyclone separator, and method for monitoring particulates in a fluid
    EP2352599B1|2014-09-17|Centrifugal separator with venturi arrangement
    CN100584427C|2010-01-27|Self-priming filtration device
    JP6659249B2|2020-03-04|Suction strainer
    JPWO2017209054A1|2019-04-18|Filter device
    SE0950893A1|2011-05-25|Filter and method for filtering hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter
    US20200038785A1|2020-02-06|Strainer
    KR20100084832A|2010-07-28|Purifier having ice making function and being able to recycle drain water
    EP3581253B1|2021-03-31|Filter device and filtration device
    CN102648034A|2012-08-22|Pressure filter device
    JP6469198B1|2019-02-13|Filtration device
    KR101287156B1|2013-07-17|Centrifugal circulating purifier system
    US20130233414A1|2013-09-12|Quiescent Zone Fluid Filter
    JP4764671B2|2011-09-07|Manhole pump device and operation method thereof
    JP2007125479A|2007-05-24|Filtration device
    US10804546B2|2020-10-13|Ion exchange filter assembly with integrated degas function
    JP4535447B2|2010-09-01|Filter misassembly prevention structure
    US20130180908A1|2013-07-18|Filter Backflush System for Entrained Filtration Elements
    JP6065319B2|2017-01-25|Fuel supply device
    JP2018202365A|2018-12-27|Tank device and filter device
    EP3684493B1|2021-12-22|Internal continuous air bypass
    JP2020084445A|2020-06-04|Recover device of contaminant in sewerage manhole
    JP2009216006A|2009-09-24|Manhole pump system
    JP2017213555A|2017-12-07|Filter device
    同族专利:
    公开号 | 公开日
    WO2011065891A1|2011-06-03|
    US9776110B2|2017-10-03|
    CN102665853B|2015-04-15|
    EP2504076A4|2013-07-03|
    CN102665853A|2012-09-12|
    EP2504076A1|2012-10-03|
    SE534326C2|2011-07-12|
    US20120181234A1|2012-07-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2707562A|1952-04-17|1955-05-03|Bendix Aviat Corp|Filter|
    GB735368A|1952-04-17|1955-08-17|Bendix Aviat Corp|Filter|
    US2998138A|1959-02-24|1961-08-29|Aero Supply Mfg Company|Filter bypass indicator|
    US3525404A|1968-02-23|1970-08-25|Hughes Tool Co|Rotary drilling rig with direct power drive and simplified controls|
    DE2036302C3|1970-07-22|1981-07-23|Purolator Filter GmbH, 7110 Öhringen|Filter arrangement, in particular for oil return filters in motor vehicles|
    BE788559A|1971-09-13|1973-03-08|Caterpillar Tractor Co|FILTER SET|
    DE2429510A1|1974-06-20|1976-01-02|Brichta Werner|Bypass valve for hydraulic oil filter - being piston valve which opens recycle when pressure drop exceeds set valve|
    DE3400820A1|1984-01-12|1985-07-18|Johannes 2050 Hamburg Donat|Monitoring device for monitoring the pressure-relief valve in non-reusable and disposable filters|
    EP0756512B1|1995-02-22|1999-05-06|Parker Hannifin Oy|Filter provided with a bypass opening|
    DE19515962A1|1995-03-29|1996-10-02|Argo Gmbh Fuer Fluidtechnik|Hydraulic circuit|
    US7243740B2|2003-12-05|2007-07-17|Pathfinder Energy Services, Inc.|Filter assembly having a bypass passageway and method|
    JP2005288391A|2004-04-02|2005-10-20|Hitachi Ltd|Oil filter device|
    EP2203233B1|2007-10-19|2011-04-13|MP Filtri S.P.A.|Device for filtering pressurized oil|EP2945719A4|2013-01-15|2016-03-09|United Technologies Corp|Fuel system ice and debris separatorwith partial filter screen and torturous path|
    法律状态:
    2021-06-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950893A|SE534326C2|2009-11-24|2009-11-24|Filter and method for filtering hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|SE0950893A| SE534326C2|2009-11-24|2009-11-24|Filter and method for filtering hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|
    EP10833657.9A| EP2504076A4|2009-11-24|2010-11-03|Filter and method for filtration of hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|
    PCT/SE2010/051192| WO2011065891A1|2009-11-24|2010-11-03|Filter and method for filtration of hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|
    CN201080052835.1A| CN102665853B|2009-11-24|2010-11-03|Filter and method for filtration of hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|
    US13/261,246| US9776110B2|2009-11-24|2010-11-03|Filter and method for filtration of hydraulic oil in a return line to a hydraulic tank, and a drilling rig comprising the filter|
    [返回顶部]