EP3154704A1 - Arrangement for the precleaning of air and an air intake system equipped with such an arrangement - Google Patents

Arrangement for the precleaning of air and an air intake system equipped with such an arrangement

Info

Publication number
EP3154704A1
EP3154704A1 EP15805838.8A EP15805838A EP3154704A1 EP 3154704 A1 EP3154704 A1 EP 3154704A1 EP 15805838 A EP15805838 A EP 15805838A EP 3154704 A1 EP3154704 A1 EP 3154704A1
Authority
EP
European Patent Office
Prior art keywords
air
duct
cyclones
outlet
arrangement
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.)
Withdrawn
Application number
EP15805838.8A
Other languages
German (de)
French (fr)
Other versions
EP3154704A4 (en
Inventor
Eric FALKGRIM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scania CV AB
Original Assignee
Scania CV AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Scania CV AB filed Critical Scania CV AB
Publication of EP3154704A1 publication Critical patent/EP3154704A1/en
Publication of EP3154704A4 publication Critical patent/EP3154704A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B04C3/06—Construction of inlets or outlets to the vortex chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/18—Cleaning-out devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C3/00—Apparatus in which the axial direction of the vortex flow following a screw-thread type line remains unchanged ; Devices in which one of the two discharge ducts returns centrally through the vortex chamber, a reverse-flow vortex being prevented by bulkheads in the central discharge duct
    • B04C3/04—Multiple arrangement thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/0212—Multiple cleaners
    • F02M35/0216—Multiple cleaners arranged in series, e.g. pre- and main filter in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/022—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls
    • F02M35/0223—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls by centrifugal forces, e.g. cyclones
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
    • F02M35/048—Arranging or mounting on or with respect to engines or vehicle bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10013—Means upstream of the air filter; Connection to the ambient air

Definitions

  • the present invention concerns an arrangement for the precleaning of air in an air duct upstream of a filter for the cleaning of air, whereby the arrangement comprises a cyclone set with one or more cyclones that together cover the cross-sectional area of the air duct and through which the air is to pass on its way to the filter in order to separate, through this set, solid particles from the air, and whereby the arrangement comprises a bend in the air duct that is located immediately downstream of an outlet from the said cyclone set that defines a change of direction of the said duct by at least 60°, and an air intake system according to the introductions of the attached claims.
  • a said filter with very high efficiency is used, while in surroundings with particularly high levels of dust also a said precleaning arrangement is used.
  • the number of cyclones in the cyclone set of the precleaning arrangement may be 1 , but is typically a few large ones or many small ones, which separate dust from the air through centrifugal action. The "centrifuged" air subsequently passes onwards to the filter and is further cleaned, while the dust is emitted back to the atmosphere from the cyclones.
  • the higher the efficiency of the cyclone set the longer can the period be between the said expensive exchange of filter and maintenance.
  • the efficiency of the cyclone set depends on how the set is arranged in the air duct, and that it can deviate considerably from the efficiency that has been determined in tests carried out under laboratory conditions. It has, for example, proved to be the case that a said cyclone set that has been tested in a "straight channel", i.e. an air duct that extends directly in towards the cyclone set and also from the outlet of the cyclone set directly away from the cyclone set, can demonstrate an efficiency of approximately 80%, but that this efficiency can fall to as low as approximately 10% if the cyclone set is subsequently arranged in an air duct that demonstrates a severe bend immediately downstream of the outlet of the cyclone set.
  • astraight channel i.e. an air duct that extends directly in towards the cyclone set and also from the outlet of the cyclone set directly away from the cyclone set
  • the purpose of the present invention is to provide an arrangement and an air intake system of the type defined in the introduction that are improved in at least some respect relative to previously known such arrangements and systems.
  • the invention is based on the insight that the said bend located immediately downstream of the outlet of the cyclone set creates an uneven distribution of the flow of air through the cyclones, such that certain of these obtain flows that are too high while certain of the cyclones obtain flows that are too low, compared with the ideal flow at which each cyclone has its maximum efficiency. Also in the case of a single cyclone, the flow of air through the said bend will in this way be significantly higher in some regions than in other regions, and thus the efficiency of the cyclone will in this way be severely reduced.
  • the said section of duct has essentially rotational symmetry, or rotational symmetry, relative to the said central axis.
  • the flow of air through the cyclone set receives through the presence of the said section of duct a particularly evenly distribution across the cross- section of the cyclone set.
  • the section of duct demonstrates essentially the form of a truncated cone or the form of a truncated cone, which is the obj ect of a further embodiment of the invention.
  • the said walls form an angle of 10°-60°, 20°-60° or 30°-50° with the said central axis.
  • the cyclone set demonstrates several cyclones arranged parallel in the said air duct, more than two cyclones, at least four cyclones, or at least ten cyclones.
  • the invention achieves a particularly marked improvement in efficiency for a cyclone set that demonstrates several cyclones, in particular a large number of cyclones, since all will demonstrate a high efficiency, also those that in the absence of the said section of duct would have had an efficiency that approached zero.
  • the said bend defines a said change of direction of 70- 1 10°, 80- 100°, essentially 90° or 90°.
  • a said bend normally connects sections of air duct that are directed essentially at right angles relative to each other.
  • the purpose according to the invention is achieved with respect to the air intake system by the provision of an air intake system according to the attached independent patent claims for an air intake system.
  • the advantages of such a system are made clear with all desirable clarity by the description above of the system according to the invention.
  • the invention concerns also a motor vehicle that demonstrates an air intake system according to the invention.
  • Figure 1 is an extremely simplified view that illustrates an air intake system for a combustion engine of a motor vehicle of the type according to the invention
  • Figure 2 illustrates schematically an arrangement of the type that the present invention concerns
  • Figure 3 is a view corresponding to that of Figure 2 of an arrangement according to one embodiment of the invention.
  • FIG. 1 illustrates very schematically the general design of an air intake system 1 for a combustion engine of the type that the present invention concerns and that contains also an arrangement for the precleaning of air of the type that the present invention concerns.
  • the air intake system is arranged in a motor vehicle 2 that is schematically suggested in the drawing, and comprises an air intake 3 in the form of what is known as a "grill" through which ambient air is intended to be drawn by suction into the air intake system.
  • the system comprises also an air duct 4 for leading the air that has been drawn in through the air intake to the combustion engine 5, also highly schematically suggested, which may be of any freely chosen type and may demonstrate, for example, a freely chosen number of cylinders.
  • the system demonstrates further a filter 6 arranged in the air duct 4 for the cleaning of the air, and a cyclone set 7 arranged upstream of the filter in the said duct in the pathway of the air towards the combustion engine, with a large number, such as ten, cyclones 8 arranged in parallel that together cover the cross-sectional area of the air duct and through which air is to pass for the separation of solid particles from the air.
  • the cyclones may have any freely chosen design.
  • a bend 10 in the air duct 4 is arranged immediately downstream of an outlet 9 from the cyclone set 7, and this bend defines a change of direction of the duct by 90°. Just as in motor vehicles, as also in heavy trucks, it may sometimes be necessary to arrange such a bend after a said cyclone set due to the shortage of space that is prevalent.
  • the cyclones 8 of a said cyclone set demonstrate an efficiency of approximately 70-80% for a certain particle size, i.e. they remove a total of 70-80% of the solid particles in the air in the case in which the flow of air through the cyclone set 7 is evenly distributed over the cyclones.
  • the filter 6 subsequently deals essentially totally with the particles that remain. This means that the speed with which the filter 6 becomes clogged depends directly on the efficiency of the cyclone set 7.
  • Figure 2 illustrates what happens when the said flow of air passes the cyclone set 7 and the bend 10 of the air intake system shown in Figure 1 .
  • the flow of air through the cyclone set 7 will come to distribute itself unevenly over the cyclones 8, such that an increased flow of air will be the result in the cyclones 8' whose outlet is located most close to the continuation 1 1 of the air duct after the bend 10, while a reduced flow of air will be the result in the cyclones 8" that are located distant from this continuation 1 1 of the air duct.
  • the said flow of air through a cyclone differs markedly from the flow for which it is designed, its efficiency can fall to a fraction of what it is at the optimal flow of air, such as, for example, down to approximately 10%, also for cyclones with a increased flow of air that passes through. This means then that the period of time until the filter 6 is clogged will be considerably reduced relative to an optimal even flow of air through the complete cyclone set, such as to a quarter.
  • FIG. 3 An arrangement for the precleaning of air is illustrated schematically in Figure 3.
  • This arrangement is provided with a duct element 12 arranged at the outlet 9 of the cyclone set 7 designed to define a section of channel 13 from the outlet through which the air must pass, and in its path away from the outlet towards a central axis 14 of the duct, which is directed in the direction of the flow of air through the cyclones 8, is limited by converging walls 1 5.
  • the section of channel 13 have essentially rotational symmetry relative to the central axis 14, and this so in the case displayed in Figure 3, even if the section of channel there does not fully have rotational symmetry: the sections of wall 16 closest to the cyclones that are located close to the said continuation 1 1 of the air duct become progressively closer to the said central axis 14, while the sections of wall 17 that begin at the cyclones that are most distant from the said continuation 1 1 extend almost straight forwards in the formation of an angle (here approximately 45°) to the central axis 14 that does not change.
  • the section of channel 13 demonstrates essentially the form of a truncated cone.
  • the converging walls of the section of channel 13 will in this way lead the flow of air that leaves the cyclones 8 towards an opening 1 8 of the section of channel that is located downstream, which is penetrated essentially centrally by the central axis 14.
  • the flow of air will in this way not pass preferentially through any one of the cyclones: essentially the same flow of air will pass through each one of the cyclones, which will in this way demonstrate an efficiency that is close to the efficiency that arises in ideal conditions, i.e. what would be the case if the air duct were to continue straight forwards without a bend after the outlet 9 of the cyclone set 7.
  • the duct element 12 demonstrates further a part 19 that makes contact with the section of channel 13 at its opening 18 in order to form, in interaction with elements 20 of the air duct that there define the bend, a section of duct 21 with a cross-sectional area that essentially corresponds to the cross- sectional area that the air duct has at its continuation 1 1 after the bend.
  • the section of channel may have various degrees of convergence and lengths, depending of the appearance of the bend. Also deviations from rotational symmetry may be adapted to the relevant conditions in order to achieve the said even distribution of the flow of air over the cross-sectional area of the cyclone set and in this way the maximum overall efficiency of the cleaning function of the set.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cyclones (AREA)

Abstract

An arrangement for the precleaning of air in an air duct upstream of a filter for the cleaning of air comprises a cyclone set (7) with cyclones (8) that together cover the cross-sectional area of the air duct and through which air is to pass on its way to the filter in order to separate particles from the air. A bend (10) is located immediately downstream of an outlet (9) from the set (7) that defines a change of direction of the said duct. A duct element (12) is arranged at the outlet (9) of the set (7) designed to define a section of channel (13) from the outlet through which the air must pass, and in its path away from the outlet towards a central axis (14) has converging walls (15).

Description

ARRANGEMENT FOR THE PRECLEANING OF AIR AND AN AIR INTAKE SYSTEM EQUIPPED WITH SUCH AN ARRANGEMENT
TECHNICAL AREA AND BACKGROUND TECHNOLOGY OF THE INVENTION
The present invention concerns an arrangement for the precleaning of air in an air duct upstream of a filter for the cleaning of air, whereby the arrangement comprises a cyclone set with one or more cyclones that together cover the cross-sectional area of the air duct and through which the air is to pass on its way to the filter in order to separate, through this set, solid particles from the air, and whereby the arrangement comprises a bend in the air duct that is located immediately downstream of an outlet from the said cyclone set that defines a change of direction of the said duct by at least 60°, and an air intake system according to the introductions of the attached claims.
Such arrangements are used to avoid exchanging of filters as far as possible or in any case to extend the interval at which the exchange of a said filter or the maintenance of such needs to be carried out, since these measures are expensive to carry out. For this reason, arrangements of this type are particularly interesting in the case in which the inlet to the air duct is intended to be located in dirty or dusty surroundings, since good precleaning of the air before it reaches the said filter is then very important.
For the purposes of providing an example of the invention and in this way illuminating, without in any way, however, limiting it, the case of a said arrangement in an air intake for a combustion engine in heavy trucks will be described. The arrangement may be arranged, however, in air intake systems that are neither applied in motor vehicles nor associated with a combustion engine.
Heavy trucks often operate in dirty and dusty surroundings, and in order for the engines of these trucks not to be damaged by all the dust, a said filter with very high efficiency is used, while in surroundings with particularly high levels of dust also a said precleaning arrangement is used. The number of cyclones in the cyclone set of the precleaning arrangement may be 1 , but is typically a few large ones or many small ones, which separate dust from the air through centrifugal action. The "centrifuged" air subsequently passes onwards to the filter and is further cleaned, while the dust is emitted back to the atmosphere from the cyclones. The higher the efficiency of the cyclone set, the longer can the period be between the said expensive exchange of filter and maintenance. It has, however, proved to be the case that the efficiency of the cyclone set depends on how the set is arranged in the air duct, and that it can deviate considerably from the efficiency that has been determined in tests carried out under laboratory conditions. It has, for example, proved to be the case that a said cyclone set that has been tested in a "straight channel", i.e. an air duct that extends directly in towards the cyclone set and also from the outlet of the cyclone set directly away from the cyclone set, can demonstrate an efficiency of approximately 80%, but that this efficiency can fall to as low as approximately 10% if the cyclone set is subsequently arranged in an air duct that demonstrates a severe bend immediately downstream of the outlet of the cyclone set. It follows from this that at least some of the cyclones in the cyclone set in such a case become, in principle, totally ineffective. It is exactly in actual vehicle installations that it is often impossible to obtain space for ideally long pipes or ducts in front of or behind the cyclone set, and the performance will thus suffer. One arrangement of the type that is defined in the introduction, although it does not have a said bend immediately downstream of the outlet of the cyclone set, is previously known through, for example, US 2009/015 1308 A l .
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide an arrangement and an air intake system of the type defined in the introduction that are improved in at least some respect relative to previously known such arrangements and systems.
This purpose is achieved, according to the invention, with respect to the arrangement by providing an arrangement of the type that has the features that are listed in the characterising part of claim 1 . The invention is based on the insight that the said bend located immediately downstream of the outlet of the cyclone set creates an uneven distribution of the flow of air through the cyclones, such that certain of these obtain flows that are too high while certain of the cyclones obtain flows that are too low, compared with the ideal flow at which each cyclone has its maximum efficiency. Also in the case of a single cyclone, the flow of air through the said bend will in this way be significantly higher in some regions than in other regions, and thus the efficiency of the cyclone will in this way be severely reduced. Through the arrangement of the said duct elements with the section of duct limited by converging walls at the outlet of the cyclone set, the flow of air directly downstream of the cyclone set will be guided to be essentially evenly distributed across the said cross-sectional area of the section of channel, and in this way essentially evenly distributed over the cross-sectional area of the cyclone set, such that, in the case of several cyclones, the flow will be essentially the same through each one of these and will, in this way, be of the magnitude that corresponds to an optimal efficiency of each cyclone. This means that the interval between expensive exchanges of filter and maintenance of filters can be extremely significantly extended in an arrangement according to the invention relative to previously known such arrangements.
According to one embodiment of the invention, the said section of duct has essentially rotational symmetry, or rotational symmetry, relative to the said central axis. With such a design of the section of duct, the flow of air through the cyclone set receives through the presence of the said section of duct a particularly evenly distribution across the cross- section of the cyclone set. It has, at the same, been shown to be advantageous that the section of duct demonstrates essentially the form of a truncated cone or the form of a truncated cone, which is the obj ect of a further embodiment of the invention.
According to a further embodiment of the invention, the said walls form an angle of 10°-60°, 20°-60° or 30°-50° with the said central axis.
These are suitable angles for the convergence of the section of duct in order to achieve an essentially equally distributed flow of air across the cross-sectional area of the cyclone set, through this set. According to a further embodiment of the invention, the cyclone set demonstrates several cyclones arranged parallel in the said air duct, more than two cyclones, at least four cyclones, or at least ten cyclones. The invention achieves a particularly marked improvement in efficiency for a cyclone set that demonstrates several cyclones, in particular a large number of cyclones, since all will demonstrate a high efficiency, also those that in the absence of the said section of duct would have had an efficiency that approached zero.
According to a further embodiment, the said bend defines a said change of direction of 70- 1 10°, 80- 100°, essentially 90° or 90°. A said bend normally connects sections of air duct that are directed essentially at right angles relative to each other.
The purpose according to the invention is achieved with respect to the air intake system by the provision of an air intake system according to the attached independent patent claims for an air intake system. The advantages of such a system are made clear with all desirable clarity by the description above of the system according to the invention. The invention concerns also a motor vehicle that demonstrates an air intake system according to the invention.
Further advantages and advantageous features of the invention are made clear by the description given below.
BRIEF DESCRIPTION OF DRAWINGS
An embodiment of the invention is described as a presented example below with reference to the attached drawings, of which:
Figure 1 is an extremely simplified view that illustrates an air intake system for a combustion engine of a motor vehicle of the type according to the invention, Figure 2 illustrates schematically an arrangement of the type that the present invention concerns, and
Figure 3 is a view corresponding to that of Figure 2 of an arrangement according to one embodiment of the invention.
DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION Figure 1 illustrates very schematically the general design of an air intake system 1 for a combustion engine of the type that the present invention concerns and that contains also an arrangement for the precleaning of air of the type that the present invention concerns. The air intake system is arranged in a motor vehicle 2 that is schematically suggested in the drawing, and comprises an air intake 3 in the form of what is known as a "grill" through which ambient air is intended to be drawn by suction into the air intake system. The system comprises also an air duct 4 for leading the air that has been drawn in through the air intake to the combustion engine 5, also highly schematically suggested, which may be of any freely chosen type and may demonstrate, for example, a freely chosen number of cylinders. The system demonstrates further a filter 6 arranged in the air duct 4 for the cleaning of the air, and a cyclone set 7 arranged upstream of the filter in the said duct in the pathway of the air towards the combustion engine, with a large number, such as ten, cyclones 8 arranged in parallel that together cover the cross-sectional area of the air duct and through which air is to pass for the separation of solid particles from the air. The cyclones may have any freely chosen design. A bend 10 in the air duct 4 is arranged immediately downstream of an outlet 9 from the cyclone set 7, and this bend defines a change of direction of the duct by 90°. Just as in motor vehicles, as also in heavy trucks, it may sometimes be necessary to arrange such a bend after a said cyclone set due to the shortage of space that is prevalent.
In ideal conditions, the cyclones 8 of a said cyclone set demonstrate an efficiency of approximately 70-80% for a certain particle size, i.e. they remove a total of 70-80% of the solid particles in the air in the case in which the flow of air through the cyclone set 7 is evenly distributed over the cyclones. This is the case if the cyclone set is arranged in a "straight duct", i.e. an air duct that continues in the same direction at the outlet of the cyclone set as the direction it had at the inlet. The filter 6 subsequently deals essentially totally with the particles that remain. This means that the speed with which the filter 6 becomes clogged depends directly on the efficiency of the cyclone set 7.
Figure 2 illustrates what happens when the said flow of air passes the cyclone set 7 and the bend 10 of the air intake system shown in Figure 1 . Through the presence of the said bend 10, the flow of air through the cyclone set 7 will come to distribute itself unevenly over the cyclones 8, such that an increased flow of air will be the result in the cyclones 8' whose outlet is located most close to the continuation 1 1 of the air duct after the bend 10, while a reduced flow of air will be the result in the cyclones 8" that are located distant from this continuation 1 1 of the air duct. If the said flow of air through a cyclone differs markedly from the flow for which it is designed, its efficiency can fall to a fraction of what it is at the optimal flow of air, such as, for example, down to approximately 10%, also for cyclones with a increased flow of air that passes through. This means then that the period of time until the filter 6 is clogged will be considerably reduced relative to an optimal even flow of air through the complete cyclone set, such as to a quarter.
The present invention, however, provides a solution to this problem, and one possible embodiment of an arrangement for the precleaning of air is illustrated schematically in Figure 3. This arrangement is provided with a duct element 12 arranged at the outlet 9 of the cyclone set 7 designed to define a section of channel 13 from the outlet through which the air must pass, and in its path away from the outlet towards a central axis 14 of the duct, which is directed in the direction of the flow of air through the cyclones 8, is limited by converging walls 1 5. It is preferable that the section of channel 13 have essentially rotational symmetry relative to the central axis 14, and this so in the case displayed in Figure 3, even if the section of channel there does not fully have rotational symmetry: the sections of wall 16 closest to the cyclones that are located close to the said continuation 1 1 of the air duct become progressively closer to the said central axis 14, while the sections of wall 17 that begin at the cyclones that are most distant from the said continuation 1 1 extend almost straight forwards in the formation of an angle (here approximately 45°) to the central axis 14 that does not change.
Thus the section of channel 13 demonstrates essentially the form of a truncated cone. The converging walls of the section of channel 13 will in this way lead the flow of air that leaves the cyclones 8 towards an opening 1 8 of the section of channel that is located downstream, which is penetrated essentially centrally by the central axis 14. The flow of air will in this way not pass preferentially through any one of the cyclones: essentially the same flow of air will pass through each one of the cyclones, which will in this way demonstrate an efficiency that is close to the efficiency that arises in ideal conditions, i.e. what would be the case if the air duct were to continue straight forwards without a bend after the outlet 9 of the cyclone set 7. The duct element 12 demonstrates further a part 19 that makes contact with the section of channel 13 at its opening 18 in order to form, in interaction with elements 20 of the air duct that there define the bend, a section of duct 21 with a cross-sectional area that essentially corresponds to the cross- sectional area that the air duct has at its continuation 1 1 after the bend. The invention is, naturally, not in any way limited to the embodiment described above: a number of possibilities for modifications of it should be obvious for one skilled in the arts, without it for this reason deviating from the scope of the invention as it has been defined in the attached claims.
As has been previously mentioned, the section of channel may have various degrees of convergence and lengths, depending of the appearance of the bend. Also deviations from rotational symmetry may be adapted to the relevant conditions in order to achieve the said even distribution of the flow of air over the cross-sectional area of the cyclone set and in this way the maximum overall efficiency of the cleaning function of the set.

Claims

Claims
An arrangement for the precleaning of air in an air duct (4) upstream of a filter (6) for the cleaning of air, whereby the arrangement comprises a cyclone set (7) with one or more cyclones (8) that together cover the cross-sectional area of the air duct and that the air is to pass through on its way to the filter in order through this set to separate solid particles from the air, and whereby the arrangement comprises a bend ( 10) in the air duct (4) that is located immediately downstream of an outlet (9) from the said cyclone set (7) and that defines a change of direction of said duct by at least 60°,
characterised in that the arrangement comprises a duct element ( 12) arranged at the said outlet (9) of the cyclone set (7) designed to define a section of channel ( 13) from the outlet through which the air has to pass and that is limited by converging walls ( 1 5) directed away from the outlet (9) towards a central axis ( 14) of this section of channel, which is directed in the direction of flow of air through the cyclones (8).
The arrangement according to claim 1 , characterised in that the said section of duct ( 13) has essentially rotational symmetry, or rotational symmetry, relative to the said central axis ( 14).
3. The arrangement according to claim 1 or 2, characterised in that the said section of channel ( 13) demonstrates essentially the form of a truncated cone or the form of a truncated cone.
4. The arrangement according to any one of the preceding claims, characterised in that said walls ( 15) form an angle of 10°-60°, 20°-60° or 30°-50° with the said central axis ( 14).
The arrangement according to any one of the preceding claims, characterised in that the said cyclone set (7) demonstrates several cyclones (8) more than two cyclones, at least four cyclones or at least ten cyclones, arranged parallel in the said air duct (4). 6. The arrangement according to any one of the preceding claims, characterised in that that the said bend ( 10) defines a said change of direction of 70- 1 10°, 80- 100°, essentially 90° or 90°.
An air intake system for a combustion engine (5) comprising an air intake (3) through which ambient air is intended to be drawn by suction into the air intake system, an air duct (4) connected to the air intake to lead the air that has been drawn by suction in through the air intake to the combustion engine (5), a filter (6) arranged in the said duct for the cleaning of the air, and a cyclone set (7) arranged in the said duct (4) in the pathway of the air towards the combustion engine (4) upstream of the filter (6) with one or more cyclones (8) that together cover the cross-sectional area of the air duct and through which air is to pass for the separation of solid particles from the air, whereby the air duct (4) immediately downstream of the said cyclone set (7) demonstrates a bend that defines a change of direction of the duct by at least 60°,
characterised in that the system comprises a duct element ( 12) arranged at the outlet (9) of the cyclone set (7) designed to define a section of channel ( 13) from the outlet through which the air must pass, and in its path away from the outlet (9) towards a central axis ( 14) of the duct, which is directed in the direction of the flow of air through the cyclones (8), is limited by converging walls ( 15).
A motor vehicle, characterised in that it comprises an air intake system ( 1 ) according to claim 7.
The motor vehicle according to claim 8, characterised in that it is a wheeled motor vehicle (2), such as a truck or bus, a vehicle that travels on tracks, or a boat.
EP15805838.8A 2014-06-10 2015-05-25 Arrangement for the precleaning of air and an air intake system equipped with such an arrangement Withdrawn EP3154704A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1450701A SE538030C2 (en) 2014-06-10 2014-06-10 Device for air purification and air intake system provided with such device
PCT/SE2015/050595 WO2015190976A1 (en) 2014-06-10 2015-05-25 Arrangement for the precleaning of air and an air intake system equipped with such an arrangement

Publications (2)

Publication Number Publication Date
EP3154704A1 true EP3154704A1 (en) 2017-04-19
EP3154704A4 EP3154704A4 (en) 2017-11-29

Family

ID=54833942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15805838.8A Withdrawn EP3154704A4 (en) 2014-06-10 2015-05-25 Arrangement for the precleaning of air and an air intake system equipped with such an arrangement

Country Status (3)

Country Link
EP (1) EP3154704A4 (en)
SE (1) SE538030C2 (en)
WO (1) WO2015190976A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9745924B2 (en) * 2015-05-29 2017-08-29 Mann+Hummel Gmbh Hood of a multi cyclone block of an air cleaner and air cleaner
CN106368859A (en) * 2016-11-23 2017-02-01 平利县凯灵汽车零部件有限公司 Special filter for automobile
JP7008479B2 (en) * 2017-11-16 2022-01-25 株式会社マーレ フィルターシステムズ Intake system swirl flow generator

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1619920B1 (en) * 1967-09-27 1970-10-01 Siemens Ag Swirl device for pre-cleaning the raw gas flow of a three-phase vortex
US4159899A (en) * 1977-08-26 1979-07-03 Fram Corporation Precleaner assembly
DE3523434A1 (en) * 1985-06-29 1987-01-08 Daimler Benz Ag Air precleaning device for an intake line of internal combustion engines for the propulsion of a vehicle
ZA931264B (en) * 1992-02-27 1993-09-17 Atomic Energy South Africa Filtration.
DE10235761B4 (en) * 2002-08-05 2022-04-14 Andreas Stihl Ag & Co. suction device
DE10330296A1 (en) * 2003-07-04 2005-02-03 Mann + Hummel Gmbh separating
US20080156301A1 (en) * 2006-10-02 2008-07-03 Stoneridge, Inc. Dust Separation Device
KR20090064082A (en) * 2007-12-14 2009-06-18 현대자동차주식회사 Intake duct system for an engine

Also Published As

Publication number Publication date
EP3154704A4 (en) 2017-11-29
SE538030C2 (en) 2016-02-16
WO2015190976A1 (en) 2015-12-17
SE1450701A1 (en) 2015-12-11

Similar Documents

Publication Publication Date Title
CN105268250B (en) Cyclone separator and filter device with cyclone separator
US20190009205A1 (en) Separating device
CN104822932B (en) The air inlet module of the free-air diffuser of internal combustion engine
US9151253B2 (en) Rain deflector for an intake duct of a work vehicle
CN102821665B (en) Cyclone separation device and electric cleaner
US9719352B2 (en) Compartment based inlet particle separator system
US9248394B2 (en) Air scoop-cyclone filter assembly
US10145278B2 (en) Blow-by gas passage structure
US8876961B2 (en) Particle separator with deflector and lateral opening and air filter system
EP3154704A1 (en) Arrangement for the precleaning of air and an air intake system equipped with such an arrangement
CN203321719U (en) Vehicle engine air inlet system with fan injection dust exhaust device
CN104812282B (en) Cyclone dust separator device, cyclone dust separator and cyclone vacuum cleaner
CN103321797B (en) Vehicle engine intake system with fan-ejected dust removal device
EP3014097B1 (en) Air intake arrangement for engine
US8177873B2 (en) Separating device for separating out particles
CN105194947A (en) Electricity-to-bag dust collector
US20150377192A1 (en) Exhaust ejector tube for engine system
CN106523213B (en) A kind of engine with supercharger air intake duct
US11118545B2 (en) Precleaner system
JP6859923B2 (en) Ventilation duct
CN204476619U (en) A kind of intake duct water treatment plant
US20120272630A1 (en) Controlled flow air precleaner
CN107642441A (en) A kind of electrostatic self-cleaning type air filter for automobile
CN201763473U (en) Air prefilter
CN207212455U (en) Tail gas buffer unit

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170110

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20171102

RIC1 Information provided on ipc code assigned before grant

Ipc: B01D 45/16 20060101ALI20171025BHEP

Ipc: F02M 35/02 20060101ALI20171025BHEP

Ipc: B04C 3/06 20060101ALI20171025BHEP

Ipc: F02M 35/10 20060101ALI20171025BHEP

Ipc: B01D 45/18 20060101ALI20171025BHEP

Ipc: F02M 35/08 20060101ALI20171025BHEP

Ipc: F02M 35/022 20060101ALI20171025BHEP

Ipc: B01D 46/00 20060101ALI20171025BHEP

Ipc: B04C 3/04 20060101AFI20171025BHEP

Ipc: F02M 35/04 20060101ALI20171025BHEP

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20180726

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RAP3 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SCANIA CV AB

18D Application deemed to be withdrawn

Effective date: 20201208