巴西专利BR112012022806B1 centrifugal separator

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专利摘要:
CENTRIFUGAL SEPARATOR WITH PROTECTED BEARING. The present invention relates to a centrifugal filtration of fluids containing abrasive contaminating particles, the rotor bearing (3) must be isolated from the fluid that passes into and through the rotor chamber (21). This is achieved by a design in which the rod (4) is connected to the rotor in order to rotate the rotor (5, 6, 7) in unison with respect to the base (1). The bearings (3) for the rod (4) are supplied in a bearing housing (2), which is fixedly mounted to the base (1) and a sealing arrangement, preferably an axial sealing spring (14, 15), is provided between the stem (4) and the base (1) at a location below the bearings (3) in the bearing housing (2).
公开号:BR112012022806B1
申请号:R112012022806-4
申请日:2011-02-25
公开日:2020-08-25
发明作者:Nigel Burford；Anthony Fell；Klemens Dworatzek；Nicholas Foulkes；John Lawrence Mills
申请人:Mann+Hummel Gmbh；
IPC主号:

专利说明:

[0001] [0001] The present invention relates to a centrifugal separator, also known in the art as a "centrifugal filter". BACKGROUND
[0002] [0002] Centrifugal separators are well known for separating fluids of different densities or for separating matter from particles and liquids. The working principle of such a centrifugal separator is a box that contains a rotor that is supported therein to rotate at high speed around a substantially vertical axis. The fluid from which the contaminants are removed is supplied to the rotor at high pressure along the axis of rotation. As this fluid passes through the rotor, denser materials or contaminating particles are separated by centrifugation and then retained in the rotor typically in the form of a cake that adheres to the internal surface of the rotor, which is cleaned or replaced at intervals.
[0003] [0003] Self-powered centrifugal separators, in which the fluid from which the contaminants are to be removed also provides the impetus for the rotor have long been used in vehicle lubrication systems, as well as in another separation process industry. GB 2160796 and GB 2296942 describe self-powered centrifugal separators of the type comprising a base, a vertical rod substantially vertical from the base, a rotor mounted on the rod for rotation around it, by reaction for the emission of fluid from nozzles rotor, the base having an inlet passage for said fluid and the rod having an axial bore and the outlets thereof for supplying fluid to the rotor from said inlet passage, and a cover mounted on the base and that surrounds the rotor. In this type of separator, the fluid is supplied under pressure from the base of the housing and flows upward through the axial hole to outlets near the top of the hole, which is typically a blind hole. A removable cover is typically mounted on the top of the stem to secure the cover.
[0004] [0004] Until now, it has not been possible to use a centrifugal separator, either of the self-feeding type or when fed independently of the fluid to be filtered, for cleaning, that is, removing contaminating particles from a liquid in which the particles count -minents are abrasive, for example, sharpening oil, grinding machine cooling, electrode discharge machining fluids, or oil that abruptly cools oven fluids. This is because the bearings on which the rotor is mounted become very quickly worn out by the action of abrasive particles and needed to be replaced very often. For example, after as little as 30 seconds of operation with liquids containing abrasive particles, the bearings can be used sufficiently to prevent or at least hinder balanced rotor rotation and efficient continuous centrifugal separation, and need to be replaced.
[0005] [0005] Furthermore, until now it has not been possible to use such a separator (filter) to remove contaminating particles from a liquid, which is not in itself a lubricant as the liquid typically acts as a lubricating fluid for the rotor bearings, as well as the fluid from the unit to the rotor, in the case of a self-powered separator. Thus, it has not been possible to use such a filter for the purpose of water purification, for example, for the removal of water particles.
[0006] [0006] The object of the present invention is the design of a centrifugal separator, which can be used to clean a liquid that contains abrasive contaminating particles or a liquid that is not in itself a lubricating fluid. More specifically, the objective is to design such a separator, where the contact between the fluid to be separated and the bearings is eliminated. The bearing arrangement, allowing the rotation of the rotor in relation to the fixed / stationary parts, cannot be exposed to the liquid to be cleaned, which, in the case of a self-powered separator, is also the driving liquid of the rotor. BRIEF SUMMARY OF THE INVENTION
[0007] [0007] According to the present invention the centrifugal separator is provided, which comprises a base, a vertical rod substantially standing from the base, a rotor mounted on the rod and defining a rotor chamber around the rod, the base having an inlet passage for the fluid to be filtered and the rod having an axial hole and outlets thereof for the supply of the fluid to be filtered to the rotor chamber from the inlet passage, which is characterized by the fact that the shaft is connected to the rotor in order to rotate in unison with the rotor in relation to the base and bearings for the stem are supplied in a bearing housing, which is fixedly mounted to the base, in which the stem is also connected to the rotor of a mode that isolates the bearing housing from the rotor chamber, and in which a sealing arrangement is provided between the stem and base at a location below the bearings in the bearing housing.
[0008] [0008] It is important that the sealing arrangement is located below the bearings so that the fluid flowing through the separator, which is inevitably lost through any sealing arrangement between rotating and stationary parts is prevented by the gravity of entry of the bearings. This can only be achieved satisfactorily in a design in which the shaft is mounted on the rotor and rotates in relation to the base and the bearing housing. This differs from conventional designs of the self-powered centrifugal separator, where the stem is stationary and the rotor rotates relative to the stem.
[0009] [0009] It was found that the sealing arrangement adequately comprises yet another axial sealing arrangement that presents a relatively small axial interface, reducing friction, in order to minimize drive losses on the rotor, and minimizing the risk of clogging by contaminating particles in relation to a radial seal interface.
[0010] [00010] The invention is also applicable to a self-powered separator, in which the rotor is provided with nozzles and the rotor is rotated by reaction to emit the fluid that is to be filtered from said nozzles, and to a separator centrifuge in which the rotor is driven independently by means other than the fluid that passes through the rotor, for example, by means of a separate motor or turbine. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] [00011] The invention will be further described, by way of example, with reference to the attached drawing, in which the only figure is a longitudinal cross section of a practical embodiment of a self-powered centrifugal separator in accordance with the invention. BRIEF SUMMARY OF THE INVENTION
[0012] [00012] As shown, this exemplary embodiment of a self-powered centrifugal separator comprises a base 1, to which a bearing box 2 is rigidly attached, which allocates two bearings of the roller element 3. Bearing 3 supports, allocates and allows the rotation of a rotor assembly 9 comprising a rod 4, on which a rotor base 5, a rotor tube 6, a rotor cap 7 and a locking ring 8 are mounted, these parts defining a rotor chamber 21 and being fixed together for rotation in unison in relation to the bearing housing 2. Bearing 3 is of the standard greased type where the grease is maintained by the low friction seals and is intended to last the life of the lubricating bearings, so that another is not needed.
[0013] [00013] A pair of opposing nozzles 10 is fixed tangentially to the base of the rotor 5.
[0014] [00014] A removable basket set 19 fits inside the chamber 21 defined by the rotor assembly 9 and serves to facilitate the removal of the contents of the rotor during cleaning. The main part of the mounting basket 19 is formed of mesh.
[0015] [00015] A cover assembly 17 is mounted on the rotor assembly 9 and is fixed to the base 1 by means of a clamp 18.
[0016] [00016] The stem 4 has a central hole 24 extending through its lower end to join with a perforation 25 located inside the housing of the rotor assembly 9, at right angles to the central hole 24 of the stem 4.
[0017] [00017] The sealing sleeve 11 is mounted in the bearing housing 2 and is free to slide in the vertical direction. The sealing sleeve 11 is prevented from turning by a screw 12 that extends through the housing 2 and engages a vertical partition 27 in the sealing sleeve 11. Such wrapping of the screw 12 inside the sealing sleeve 11 also serves to prevent the sealing sleeve 11 away from the bearing housing 2 in a vertical direction. In this context, the sealing sleeve 11 is propelled in an upward direction by the force of a compression spring 13, which sits at the bottom of the sealing sleeve 11 and acts between it and the housing 2.
[0018] [00018] An axial seal arrangement is provided between the stem 4 and the bearing housing 2. This axial seal 14 comprises a tubular bottom seal component, which is coaxially mounted within the seal sleeve 11 and a tubular seal component upper 15 which is fixed coaxially at the lower end of the stem 4. The interface between these sealing components 14, 15 is below the level of both bearings 3 in the housing 2. The force acting on the sealing sleeve 11, by force of the spring 13 is transmitted to the upper face of the lower part of the sealing component 14 which rests against the lower face of the upper sealing component 15. In the operation of the centrifuge, the upper sealing component 15 is, of course, of rotation, because it is fixed at the lower end of the rotation rod 4, while the lower sealing member 14 remains stationary, since it is fixed against the rotation of the sleeve 11, which is also, as already explained, for r mounted non-rotating in box 2.
[0019] [00019] The fluid passage extends through the base 1 from an inlet port 16 for supplying fluid to the hole of the lower sealing member 14 through the axial passages of the spring 13 and the sealing sleeve 11. The fluid passage extends through the axial bore of the rotating sealing member 15, the axial bore 24 and the transverse bore 25 of the stem 4, to enter the enclosed space, which is the rotor chamber 21 of the rotor assembly 9.
[0020] [00020] The force of the spring 13 prevents most of the liquid supplied from the inlet port 16 from escaping from the interface between the lower sealing component 14 and the rotating sealing component 15. The fluid that can escape from the The interface between the lower sealing component 14 and the rotating sealing component 15 can flow into the base 1 through perforations 26 in the bearing housing 2. In addition, the components that mount the sealing device 14, 15, such as the end bottom of the stem 4 and the sealing sleeve 11, in the illustrated example, or any other intermediate support in other modalities, are configured for direct fluid seeping down from the interface to the drain openings (perforation is 26) in box 2 from from where it passes to base 1 of the centrifuge.
[0021] [00021] The lower sealing component 14 and the rotating sealing component 15 must be made from resistant material suitable for the good abrasion resistance of the particulate material contained within the supplied fluid. In particular, the sealing interface must be sufficiently resistant to wear to maintain long periods of operation between repair or replacement of the sealing components and must provide reduced friction to minimize drive losses on the rotor. The ceramic material has been found to be suitable for cylindrical sealing components 14, 15, but other combinations of material or material may also prove to be suitable.
[0022] [00022] The pressure of the fluid and its tangential emission through the nozzles 10 drives the rotor assembly 9 and by the centrifugal force separates the particles that adhere to the inner surface of the removable basket assembly 19. The liquid from which the particles that were separate drains from the base 1 to a sump (not shown) and can be recirculated to the entry port 16.
[0023] [00023] At intervals, it is necessary to remove the rotor basket assembly 19 and the contaminant collected in it to clean or replace. The clamp 18, the filter cover assembly 17, the locking ring 8 and the rotor cover 7, must be removed before the removable rotor basket assembly 19 can be removed for cleaning. The clamp 18 allows for quick release of the cover assembly 17 before the locking ring 8 and rotor cover 7 are removed.
[0024] [00024] The lower sealing component 14 and the rotating sealing component 15 are retained in the axial and rotational direction by friction, due to the compression of the respective O-rings 20. After dismantling the represented arrangement, the lower sealing component 14 and the rotating sealing member 15 can be replaced when excessively worn.
[0025] [00025] The invention is not limited to the details of the previous modalities and many variations of design details are possible.
[0026] [00026] Throughout the report, the words "understands" and "contains" and their variations mean "including, but not limited to", and are not intended to (and do) exclude other components. Throughout the report, the singular includes the plural, unless the context imposes a different interpretation. In particular, when the indefinite article is used, the report should be understood as covering plurality, as well as uniqueness, unless the context requires otherwise.

权利要求:
Claims (7)
[0001]
Centrifugal separator comprising a base (1), a vertical stem (4) standing from the base (1), a rotor (5, 6, 7) mounted on the stem (4), and defining a rotor chamber (21) around the stem (4), the base (1) having an inlet (16) for fluid to be filtered and the stem (4) having an axial bore (24) and outlets (25) thereof to supply the fluid to be filtered into the rotor chamber (21) from the inlet passage (16), the stem (4) being connected to the rotor (5, 6, 7) in order to rotate in unison with the rotor (9 ) in relation to the base (1) and bearings (3) for the rotation of the rod (4) in relation to the base (1) are supplied in a bearing housing (2), which is fixedly mounted to the base (1) , the rod (4) being also connected to the rotor (5, 6, 7) in a way that isolates the bearing housing (2) from the rotor chamber (21), characterized by the fact that a sealing arrangement (14, 15) is provided, separately from the rotating bearings (3), between the rod (4) and the base (1) at a location below the bearings (3) in the housing of bearings (2).
[0002]
Centrifugal separator according to claim 1, characterized by the fact that the sealing arrangement (14, 15) comprises an axial sealing arrangement.
[0003]
Centrifugal separator according to claim 2, characterized by the fact that the axial sealing arrangement (14, 15) is spring-pressed (13).
[0004]
Centrifugal separator according to claim 2, characterized in that the axial sealing arrangement (14, 15) comprises upper (15) and lower (14) cylindrical sealing components, at least one of which is spring-pressed to point-to-point seal contact with the other component.
[0005]
Centrifugal separator according to any one of claims 1 to 4, characterized by the fact that it also includes a removable basket assembly (19) mounted in the rotor chamber (21).
[0006]
Centrifugal separator according to any one of claims 1 to 5, characterized by the fact that it also includes a cover assembly (17) that is mounted on the rotor (5, 6, 7) and fixed to the base (1) by means of of a quick-release clamp (18).
[0007]
Centrifugal separator according to any one of claims 1 to 6, characterized in that the rotor (5, 6, 7) is provided with nozzles (10) and the rotor (5, 6, 7) rotates in reaction to the emission of fluid from said nozzles (10).

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法律状态:
2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

2019-10-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

2020-03-24| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|

2020-06-09| B09A| Decision: intention to grant|

2020-08-25| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/02/2011, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

GB1004032A|GB2478578A|2010-03-11|2010-03-11|Centrifugal separator with protected bearing|

GB1004032.7|2010-03-11|

PCT/EP2011/052827|WO2011110432A2|2010-03-11|2011-02-25|Centrifugal separator with protected bearing|

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