US20210023479A1 - Mesh filter for fuel supply system of vehicle - Google Patents

Mesh filter for fuel supply system of vehicle Download PDF

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Publication number
US20210023479A1
US20210023479A1 US16/678,611 US201916678611A US2021023479A1 US 20210023479 A1 US20210023479 A1 US 20210023479A1 US 201916678611 A US201916678611 A US 201916678611A US 2021023479 A1 US2021023479 A1 US 2021023479A1
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United States
Prior art keywords
mesh
fuel
filter
temperature
mesh filter
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.)
Abandoned
Application number
US16/678,611
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English (en)
Inventor
Hyun No Lee
Dong Lim KIM
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors Corp
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 Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, DONG LIM, LEE, HYUN NO
Publication of US20210023479A1 publication Critical patent/US20210023479A1/en
Priority to US18/126,569 priority Critical patent/US20230226467A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/36—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with bypass means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
    • B01D24/004—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/147—Bypass or safety valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal
    • B01D39/12—Filter screens essentially made of metal of wire gauze; of knitted wire; of expanded metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D43/00—Separating particles from liquids, or liquids from solids, otherwise than by sedimentation or filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0035—Thermo sensitive valves
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/34—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements by the filter structure, e.g. honeycomb, mesh or fibrous
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/48—Filters structurally associated with fuel valves
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/50—Filters arranged in or on fuel tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
    • F16K17/386—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the closure members being rotatable or pivoting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03236—Fuel tanks characterised by special filters, the mounting thereof

Definitions

  • the present disclosure relates to a mesh filter for a fuel system of a vehicle.
  • FIG. 1 is a view illustrating a fuel system of a diesel vehicle, which includes a fuel tank 1 , a fuel supply line 2 , an engine 3 , a fuel recovery line 4 , a mesh filter 11 , a prefilter 12 , a low-pressure fuel pump 13 , a main filter 14 , a high-pressure fuel pump 14 , a common rail 16 and an injector 17 .
  • fuel which is introduced by the low-pressure fuel pump 13 , is filtered while passing through the mesh filter 11 provided in the fuel tank 1 , and the prefilter 12 provided in the fuel supply line 2 . Subsequently, the fuel is pumped by means of the low-pressure fuel pump 13 , and is further filtered so as to remove foreign substances contained in the fuel while passing through the main filter 14 .
  • the fuel that has passed through the main filter 14 is supplied to the common rail 16 under high pressure by means of the high-pressure fuel pump 15 and is sprayed to the cylinder of the engine 3 through the injector 17 .
  • the prefilter 12 serves to heat diesel fuel, and a PTC heater (not shown) provided in the prefilter 12 is activated so as to heat the diesel fuel, thereby removing solidified paraffin created in the fuel.
  • the high-pressure fuel pump 15 utilizes a portion of the diesel fuel that has passed through the main filter 14 for cooling and lubrication.
  • the remaining fuel is recovered to the fuel tank 1 from the injector 17 and the common rail 16 through the fuel recovery line 4 .
  • the diesel fuel which is used in cooling and lubrication, is also recovered to the fuel tank 1 through the fuel recovery line 4 , and a portion of the diesel fuel that has been filtered through the main filter 14 is also recovered to the fuel tank 1 through an additional fuel recovery line 4 .
  • the prefilter 12 of the fuel system of a diesel vehicle includes a water separator for separating water from the fuel.
  • the mesh filter 11 is provided inside the fuel tank 1
  • the prefilter 12 is provided outside the fuel tank 1 .
  • diesel fuel has a high boiling temperature during distillation, the diesel fuel contains a large amount of a paraffin component therein. Because the paraffin component has excellent ignition performance and high calorific value, the paraffin component must necessarily be contained in diesel fuel.
  • the paraffin solidifies at a low temperature even though the paraffin has a liquid form at an ambient temperature. Particularly, when the amount of paraffin wax, which solidifies in winter season, is increased, the viscosity of the fuel is increased.
  • Fuel containing a large amount of paraffin wax is difficult to pass through a filter element in each filter.
  • the filter is clogged due to the paraffin wax, flowability of the fuel is lowered, and the supply of fuel becomes unstable.
  • startup performance of an engine is deteriorated in winter season, and the supply of fuel becomes unstable during travelling, thereby causing shutdown of the engine. Furthermore, there may be various problems of excessive generation of soot, insufficient output during travelling of a vehicle, deterioration of acceleration performance and the like.
  • the fuel when a vehicle moves to a cold area in winter season, the fuel may solidify.
  • the fuel when the vehicle travels under acceleration immediately after soaking of the vehicle, a problem may be caused in the fuel system of the vehicle due to the solidified fuel.
  • a heating unit is provided to melt the paraffin wax
  • the prefilter is provided thereabove with a PTC heater and thereunder with a heating coil as a heating unit. Consequently, the heating unit is selectively activated through a temperature-sensitive switch by the supply of power depending on temperature.
  • the present disclosure provides a mesh filter for a fuel system of a vehicle capable of inhibiting problems caused by clogging of the mesh filter provided in a fuel tank due to paraffin wax.
  • the present disclosure solves problems of clogging of a filter due to paraffin wax, introduction of air into an introduction pipe and generation of air bubbles in the path for fuel supply, and various problems caused thereby while normally removing foreign substances contained in fuel.
  • a mesh filter for a fuel system of a vehicle may include: a frame for maintaining a shape thereof; a mesh member coupled to the frame and configured to remove foreign substances contained in fuel, where the mesh member includes a first mesh member, and a second mesh member; and an opening unit for opening and closing a fuel path in the first mesh member.
  • the second mesh member has a mesh size smaller than a mesh size of the first mesh member.
  • FIG. 1 is a view illustrating a fuel system of a diesel vehicle
  • FIG. 2 is a view illustrating a mesh filter for a fuel system of a vehicle according to one form of the present disclosure, which is provided in a fuel tank;
  • FIG. 3 is a perspective view illustrating the mesh filter according to one form of the present disclosure
  • FIG. 4 is a perspective view illustrating the substantial portions of the mesh filter according to one form of the present disclosure in a cutaway view
  • FIG. 5 is a view illustrating the mesh filter according to one form of the present disclosure, in which an opening unit closes a fuel path in a first mesh member;
  • FIG. 6 is a view illustrating the mesh filter according to one form of the present disclosure, in which the opening unit opens the fuel path in the first mesh member;
  • FIG. 7 is a perspective view illustrating the structure of the opening unit of the mesh filter according to one form of the present disclosure.
  • FIG. 8 is a view illustrating the operation of the opening unit of the mesh filter according to one form of the present disclosure.
  • FIGS. 9 and 10 are views illustrating the structure and operation of an opening unit of a mesh filter according to another form of the present disclosure.
  • FIG. 2 is a view illustrating a mesh filter for a fuel system of a vehicle according to one form of the present disclosure, which is provided in a fuel tank.
  • FIG. 3 is a perspective view illustrating the mesh filter according to one form of the present disclosure.
  • FIG. 4 is a perspective view illustrating the substantial portions of the mesh filter according to one form of the present disclosure in a cutaway view.
  • FIGS. 3 and 4 the illustration of an introduction pipe 23 (see FIG. 2 ), which is inserted into the mesh filter 11 , is omitted.
  • the mesh filter 11 which is disposed in the fuel tank 1 , includes a frame 21 for maintaining the shape thereof and a mesh member 22 supported by the frame 21 .
  • the mesh member 22 is a filter member for removing foreign substances contained in fuel, which flows therethrough, and all of the frame 21 and the mesh member 22 of the mesh filter 11 may be made of a plastic material.
  • the mesh filter 11 made of a plastic material, because there is a concern about low heat resistance and the occurrence of thermal deformation, it is impossible to apply a heating device such as a PTC heater and a heating coil for preventing clogging of the filter with paraffin wax.
  • a heating device such as a PTC heater and a heating coil for preventing clogging of the filter with paraffin wax.
  • the mesh size of the mesh filter 11 when the mesh size of the mesh filter 11 is increased in order to prevent the clogging of the filter, the amount of foreign substances transferred to a prefilter 12 (see FIG. 1 ) from inside the fuel tank 1 may be increased, and thus the replacement cycle of the prefilter may be shortened.
  • the fuel level in the mesh filter 11 may also be lowered and the fuel level in the mesh filter 11 may be lowered below the lower end inlet of the introduction pipe 23 because fuel cannot be introduced into the mesh filter 11 .
  • a first mesh member 22 a having a relatively large mesh size is applied to a first region, which is at least a portion of the entire region of the mesh member 22 of the mesh filter 11
  • a second mesh member 22 b having a smaller mesh size than the mesh size of the first mesh member 22 a is applied to a second region, which is the remaining region of the entire region of the mesh member 22 of the mesh filter 11 .
  • a large amount of foreign substances may pass through the first mesh member 22 a having a larger mesh size, and the foreign substances may be transferred to the prefilter 12 and may contaminate the filter element in the prefilter early, thereby shortening the replacement cycle of the prefilter.
  • the mesh filter 11 is provided with an opening unit for selectively opening and closing the fuel path, which extends through the first mesh member 22 a , depending on the temperature of the fuel.
  • the mesh filter 11 is disposed inside the fuel tank 1 such that the lower end of the mesh filter 11 is upwardly spaced apart from the internal bottom surface of the fuel tank 1 by a predetermined distance.
  • the introduction pipe 23 is inserted into the mesh filter 11 so as to be vertically disposed in the mesh filter 11 .
  • the lower end inlet of the introduction pipe 23 which is disposed in the mesh filter 11 , is spaced apart from the internal bottom surface of the mesh filter by a predetermined height such that the fuel in the mesh filter 11 is introduced into the lower end inlet of the introduction pipe 23 .
  • the introduction pipe 23 is disposed in the fuel tank 1 and is disposed between the mesh filter 11 and the fuel supply line 2 (see FIG. 1 ) so as to be connected thereto, and the introduction pipe 23 in the fuel tank 1 and the fuel supply line 2 outside the fuel tank 1 serve as a fuel supply path through which fuel is supplied to the prefilter 12 (see FIG. 1 ) from the mesh filter 11 .
  • the mesh filter 11 may have a cylindrical shape, and may be constructed such that the frame 21 and the mesh member 22 are integrally coupled to each other.
  • the frame 21 includes a plate part 21 a , which is positioned at the upper end thereof, a ring part 21 b , which is positioned at the lower end thereof, a plurality of posts 21 c , which extend between the plate part 21 a and the ring part 21 b so as to connect the same to each other, and a plurality of connecting parts 21 d , which circumferentially extend so as to connect the plurality of posts 21 c to each other.
  • the plurality of posts 21 c are disposed at predetermined intervals in a circumferential direction, and the plurality of connecting parts 21 d are disposed at predetermined intervals in a vertical direction.
  • the frame 21 is configured such that the posts 21 c , which vertically extend, intersect the connecting parts 21 d each having a circular shape.
  • the plate part 21 a is provided with an insert hole 21 e , through which the introduction pipe 23 is inserted into the mesh filter 11 .
  • the spaces defined between the posts 21 c and the connecting parts 21 d and the space in the ring part 21 b serve as the spaces through which the fuel in the fuel tank 1 is introduced into the mesh filter 11 .
  • the mesh member 22 of the mesh filter 11 which is a filter element for removing foreign substances from the fuel that is introduced through the mesh filter 11 and the introduction pipe 23 , may be positioned in the spaces defined between the posts 21 c and the connecting parts 21 d , which constitute the side face of the mesh filter, and in the space in the ring part 21 b , which constitutes the bottom face of the filter.
  • the frame 21 and the mesh member 22 may be made of a plastic material.
  • the frame 21 may be made of polypropylene (PP) resin
  • the mesh member 22 may be made of polyamide (PA) resin.
  • the mesh member 22 includes the first mesh member 22 a , having a relatively large mesh size, and the second mesh member 22 b , having a smaller mesh size than the mesh size of the first mesh member 22 a.
  • the first mesh member 22 a is disposed at least a portion of the mesh filter 11
  • the second mesh member 22 b is disposed at the remaining portion of the mesh filter 11 .
  • first mesh member 22 a is disposed at least a portion of the entire region of the mesh member 22
  • second mesh member 22 b is disposed at the remainder of the entire region of the mesh member 22 .
  • the first mesh member 22 a may be constituted by a mesh member having a larger mesh size than the mesh size of particles of typical paraffin wax.
  • the first mesh member 22 a may be constituted by a mesh member having a mesh size larger than approximately 200 ⁇ m, for example, a mesh member having a mesh size of around 400 ⁇ m.
  • the mesh size means the distance between longitudinal mesh wires or transverse mesh wires, which intersect each other. Accordingly, an increased mesh size means an increased space between mesh wires through which fuel passes.
  • the first region of the mesh filter 11 in which the first mesh member 22 a is provided, may be a region that allows fuel to pass therethrough even in the state in which the fuel level in the fuel tank 1 is low, for example, a region positioned at the lower end of the mesh filter 11 . More specifically, the first region of the mesh filter 11 may be a region corresponding to the bottom surface at the lower end of the mesh filter 11 .
  • the first mesh member 22 a may be positioned in the space inside the ring part 21 b of the lower end of the mesh filter 11 .
  • the first mesh member 22 a may be the portion that constitutes the bottom (lower surface) at the lower end of the mesh filter 11 .
  • the first mesh member 22 a may be disposed in the ring part 21 b of the lower end of the mesh filter 11 , and thus fuel may be introduced through the first mesh member 22 a at the lower surface of the mesh filter 11 .
  • the second mesh member 22 b may have a mesh size smaller than the particle size of paraffin wax, for example, a mesh size of approximately 130 ⁇ m.
  • the second mesh member 22 b may be a mesh member, which is the same as a mesh member used in a conventional mesh filter or which has the same mesh size as a mesh size of a conventional mesh filter.
  • the second mesh member 22 b may be positioned in the spaces defined between the posts 21 c and the connecting parts 21 d , which constitute the frame 21 . Consequently, the second mesh member 22 b may be the portion that constitutes the side surface (the peripheral surface of the cylinder) of the mesh filter 11 .
  • the fuel in the fuel tank 1 may be introduced into the filter through the first mesh member 22 a and the second mesh member 22 b .
  • the mesh size of the first mesh member 22 a is larger than the particle size of paraffin wax, the paraffin wax may also be introduced into the filter through the first mesh member together with the fuel.
  • the second mesh member 22 b has a mesh size smaller than the particle size of the paraffin wax, the paraffin wax cannot be introduced into the filter through the second mesh member 22 b , with the result that foreign substances are filtered by the second mesh member 22 b.
  • the mesh filter 11 allows paraffin wax, which causes clogging of the filter, to be introduced through the first mesh member 22 a of the entire mesh member 22 . Since the first mesh member 22 a constitutes the lower surface of the mesh filter 11 , the mesh filter 11 allows the paraffin wax to be introduced thereinto through the lower surface thereof.
  • the mesh filter 11 further includes a novel mesh member region or path, which allows the paraffin wax as well as fuel to pass therethrough, in addition to a conventional mesh member region or path, which may make it difficult for both foreign substances and a paraffin wax component to pass therethrough and which may cause clogging of the filter with paraffin wax.
  • the side portion of the filter at which the second mesh member 22 b is provided may be the conventional path portion through which fuel passes, and the lower surface of the filter at which the first mesh member 22 a is provided may be the novel path portion, which is newly provided according to the present disclosure.
  • the mesh filter is constructed so as to allow fuel and paraffin wax to pass through the lower surface thereof, at which the first mesh member 22 a is provided, under a low temperature condition in which paraffin wax may solidify in the fuel, clogging of the first mesh member 22 a attributable to the paraffin wax is prevented, and the fuel is introduced into the filter through the lower surface portion of the filter.
  • the inside of the filter is sufficiently filled with the fuel, thereby preventing the inlet of the lower end of the introduction pipe 23 from being exposed to air.
  • a conventional mesh filter is constructed such that the entire mesh member has a mesh size that may prevent paraffin wax from passing through the mesh member and may thus cause clogging of the filter with the paraffin wax, the entire mesh member is clogged by the paraffin wax component, thereby obstructing the introduction of fuel into the filter when the temperature of the fuel in the fuel tank is low.
  • the inlet of the lower end of the introduction pipe may be exposed to air above the fuel level, and air may thus be introduced into the fuel supply line, thereby generating a large amount of air bubbles.
  • the mesh filter according to the form of the present disclosure is constructed so as to allow a paraffin wax component in fuel to pass through the region of the mesh member region having a relatively small area, that is, the region of the first mesh member 22 a , thereby preventing a phenomenon in which the first mesh member 22 a is clogged by the paraffin wax. Accordingly, since the fuel level in the filter sufficiently rises even at a low temperature, such as during the winter season, it is possible to prevent a phenomenon in which the inlet of the lower end of the introduction pipe 23 is exposed to air and a phenomenon in which a large amount of air bubbles is generated in the fuel supply path due to air introduced through the inlet of the lower end of the introduction pipe 23 .
  • the present disclosure is particularly intended to reliably prevent a phenomenon in which the fuel level in the filter is lowered due to clogging of the entire region of the mesh member and air is thus introduced into the introduction pipe 23 and forms air bubbles therein, even though a small amount of a paraffin wax component is inevitably introduced into the mesh filter 11 through the small area of the first mesh member 22 a.
  • FIG. 4 is a cross-sectional view illustrating the mesh filter 11 according to a first form of the present disclosure, to which the first mesh member 22 a is provided.
  • the ring part 21 b is positioned at the lower end of the frame 21 of the mesh filter 11 .
  • the ring part 21 b includes a support portion (not shown), which radially extends from the ring-shaped portion to the center portion 21 b′.
  • the space defined between the ring-shaped portion and a support portion of the ring part 21 b serves as a space through which fuel passes, and a support member 32 is placed on the ring part 21 b.
  • the first mesh member 22 a is disposed between the ring part 21 b and the support member 32 , and a fastener 33 is inserted into the center portion 21 b ′ of the ring part 21 b , the first mesh member 22 a , the support member 32 and a dielectric elastomer actuator 46 of an opening unit to be described later.
  • the first mesh member 22 a , the support member 32 and the dielectric elastomer actuator 46 are integrally coupled and secured to one another by the fastener 33 ,
  • the support member 32 supports the first mesh member 22 a in the filter so as to prevent separation of the first mesh member 22 a.
  • the fastener 33 may be integrally formed with a rubber valve 47 (see FIG. 7 ) of the dielectric elastomer actuator 46 .
  • the fastener 33 may be inserted into the center of the rubber valve 47 of the dielectric elastomer actuator 46 and may be coupled thereto.
  • the support member 32 may be composed of an annular ring portion 32 a and a support portion 32 b , which is configured to have a crisscross shape and is integrally formed with the ring portion 32 a . Fuel may pass through the space defined between the ring portion 32 a and the crisscross-shaped support portion 32 b.
  • the support portion 32 b of the support member 32 and the support portion (not shown) of the ring portion 21 b may be configured to have approximately the same shape.
  • the mesh filter 11 may include an opening unit 40 for opening and closing the fuel path in the first mesh member 22 a provided at the lower end of the filter.
  • FIG. 5 is a view illustrating the mesh filter 11 according to one form of the present disclosure, in which the opening unit 40 closes the fuel path in the first mesh member 22 a .
  • FIG. 6 is a view illustrating the mesh filter 11 according to another form of the present disclosure, in which the opening unit 40 opens the fuel path in the first mesh member 22 a.
  • FIGS. 7 and 8 are a perspective view and a side view, respectively, which illustrate the mesh filter according to one form of the present disclosure, in which FIG. 7 illustrates the state in which the opening unit is closed, and FIG. 8 illustrates the state in which the opening unit is open.
  • the boundary temperature (for example, 0 ⁇ ) between a temperature range in which solid paraffin wax component is created in fuel and a temperature range in which a solid paraffin wax component is not created in the fuel is referred to as a “critical temperature”.
  • the opening unit 40 may be a temperature-sensitive component adapted to open or close depending on the temperature of the fuel.
  • the opening unit 40 is constructed so as to be operated by the application of power from a vehicle battery 45 .
  • the first mesh member 22 a is not illustrated in FIGS. 7 and 8 , the first mesh member 22 a is disposed in the internal space in the ring part 21 b , which is positioned at the lower end of the mesh filter 11 , as illustrated in FIGS. 3 to 6 .
  • the opening unit 40 is constructed so as to receive power from the vehicle battery 45 via a temperature-sensitive switch 44 , which is adapted to be turned on/off depending on the temperature of fuel.
  • the opening unit 40 may be connected to the temperature-sensitive switch 44 so as to receive power from the vehicle battery 45 via the temperature-sensitive switch 44 .
  • the temperature-sensitive switch 44 which is adapted to be turned on/off depending on the temperature of fuel, may be a conventional temperature-sensitive switch of the type that is currently used in a vehicles.
  • the prefilter 12 (see FIG. 1 ) is provided with a temperature-sensitive switch adapted to allow the power from the battery to be selectively applied to a PTC heater or a heating coil depending on the temperature of the fuel.
  • the temperature-sensitive switch 44 may be a temperature-sensitive switch of a type that is currently mounted on the prefilter.
  • the temperature-sensitive switch 44 is adapted to be turned on at a low temperature at which solid paraffin wax is created and to be turned off at a high temperature at which paraffin wax is dissolved.
  • the opening unit 40 receives the power from the battery via the temperature-sensitive switch 44 . At this point, the opening unit 40 operates to open the fuel path in the first mesh member 22 a using the power applied from the battery.
  • the opening unit 40 operates to close the fuel path, thereby preventing the fuel from passing through the first mesh member 22 a.
  • the opening unit 40 of the mesh filter 11 may include a dielectric elastomer actuator (DEA), which operates so as to open and close the fuel path in the lower end of the mesh filter, that is, the fuel path in the first mesh member 22 a , when the temperature-sensitive switch 44 is turned on/off.
  • DEA dielectric elastomer actuator
  • the portion of the opening unit 40 that operates to open and close the fuel path serves as the dielectric elastomer actuator.
  • the dielectric elastomer actuator is composed of a rubber film and complaint electrodes attached to both surfaces of the rubber film.
  • the dielectric elastomer actuator which is well known in the art, operates in such a way that the rubber film is compressively deformed (contracted) due to Maxwell stress when power is applied to the compliant electrodes and the rubber film is restored to the initial shape when power is not applied to the compliant electrodes.
  • the opening unit 40 may include the dielectric elastomer actuator 46 , which is composed of a rubber valve 47 , made of a rubber film, and compliant electrodes 48 attached to both surface of the rubber valve 47 .
  • the dielectric elastomer actuator 46 itself is not different from a currently known actuator.
  • the rubber valve 47 is configured to have a circular plate shape, and is divided into two semicircular plates with respect to a central axis, which is an imaginary axis (folding line) extending through the center of the circular plate.
  • the two semicircular plates are constructed so as to be rotatable with respect to the central axis 47 .
  • Each of the two semicircular plates of the rubber valve 47 is provided on both surfaces thereof with the compliant electrodes 48 attached thereto, and the compliant electrodes 48 are connected to the temperature-sensitive switch 44 via a circuit.
  • the application of power to the compliant electrodes 48 from the battery 45 may be implemented or interrupted.
  • the compliant electrodes 48 deform or restore the rubber valve 47 so as to selectively open or close the fuel path in the first mesh member 22 a.
  • the opening unit 40 is constructed such that the rubber valve 47 is compressed (contracted) due to Maxwell stress so as to open the fuel inlet in the lower end of the mesh filter 11 , that is, the fuel path in the first mesh member 22 a , when the power from the battery 45 is applied to the compliant electrodes 48 and such that the rubber valve 47 is restored to the initial position so as to close the fuel path in the first mesh member 22 a by virtue of release of the Maxwell stress when the application of the power to the compliant electrodes 48 from the battery 45 is interrupted or released.
  • the compliant electrodes 48 contract and thus the portion of the rubber that is positioned between the compliant electrodes 48 correspondingly contracts due to Maxwell stress, thereby causing the rubber valve 47 to fold and open with respect to the central axis 47 a , which is the folding line.
  • the temperature-sensitive switch 44 is turned on. As a result, power is applied to the compliant electrodes 48 , and the rubber valve 47 is thus opened, thereby allowing the fuel in the fuel tank to be introduced into the filter through the first mesh member 22 a.
  • the rubber valve 47 When the rubber valve 47 is opened at a low temperature after starting up the engine, the fuel that has passed through the mesh filter 11 and the introduction pipe 23 (see FIGS. 5 and 6 ) is supplied to the engine through the fuel supply line. Subsequently, the portion of the fuel that is not consumed in the engine but is heated in the engine is recovered through a fuel recovery line. When the temperature of the fuel in the fuel tank is increased due to the recovery of the remaining fuel, the temperature-sensitive switch 44 is turned off, thereby allowing the rubber valve 47 to be closed again.
  • the temperature-sensitive switch 44 is turned off, and thus the application of power to the compliant electrodes 48 is interrupted.
  • the rubber valve 47 closes the fuel path in the first mesh member 22 a , thereby allowing the fuel to pass only through the second mesh member 22 b.
  • FIGS. 9 and 10 are views illustrating the construction and operation of an opening unit of a mesh filter according to another form of the present disclosure.
  • FIG. 9 illustrates the state in which the fuel is allowed to be introduced into the filter through the first mesh member 22 a by opening the opening unit 40
  • FIG. 10 illustrates the state in which the opening unit 40 is closed.
  • the ring part 21 b may be provided with a closing member 31 coupled thereto so as to close a first region of the lower surface of the filter.
  • the closing member 31 is provided in a portion thereof with an introduction hole 31 a so as to allow fuel to pass therethrough.
  • the ring part 21 b is positioned on the closing member 31 .
  • the first mesh member 22 a and the support member 32 are disposed on the ring part 21 b and coupled thereto.
  • the ring part 21 b , the first mesh member 22 a and the support member 32 are coupled in the manner described with reference to FIG. 4 .
  • the mesh filter 11 is provided at the lower end thereof with the opening unit 40 .
  • the opening unit 40 of the mesh filter shown in FIGS. 9 and 10 may also have a temperature-sensitive construction, which operates so as to open or close the fuel path depending on the temperature of the fuel.
  • the opening unit 40 is constructed so as to open the fuel path in the first mesh member 22 a in a temperature range equal to or lower than the critical temperature and to close the fuel path in the first mesh member 22 a in a temperature range higher than the critical temperature.
  • the fuel path may be embodied as the inlet 31 a formed in the closing member 31
  • the opening unit 40 may be constructed so as to open or close the introduction hole 31 a in the closing member 31 depending on the temperature of the fuel.
  • the opening unit 40 opens the introduction hole 31 a in the closing member 31 , which is positioned in the fuel path in the first mesh member 22 a , and the fuel, containing paraffin wax, in the fuel tank is thus introduced into the mesh filter 11 through the first mesh member 22 a , as illustrated in FIG. 9 .
  • the fuel may be introduced into the filter through the first mesh member 22 a and may then be supplied to the engine through the introduction pipe 23 .
  • the opening unit 40 closes the introduction hole 31 a in the closing member 31 , which is positioned in the fuel path in the first mesh member 22 a , and the fuel is thus introduced into the filter only through the second mesh member 22 b but not through the first mesh member 22 a , as in a conventional mesh filter, as illustrated in FIG. 10 .
  • the closing unit 40 closes the introduction hole 31 a to prevent the foreign substances from passing through the first mesh member 22 a , which has a large mesh size.
  • the foreign substances may be removed from the fuel through the first mesh member while the fuel passes through the first mesh member 22 a having a small mesh size as in a conventional mesh filter.
  • the temperature of the fuel in the fuel tank is increased due to the fuel that has been elevated in temperature in the engine and has been recovered to the fuel tank through the fuel recovery line 4 (see FIG. 1 ), whereby the entire paraffin wax component in the fuel completely melts.
  • the opening unit 40 may include the closing member 31 having the introduction hole 22 a formed therethrough, an opening member 41 , which is rotatably mounted on the closing member 31 and which opens or closes the introduction hole 31 a in the closing member 31 depending on the rotational angle thereof, and a temperature-sensitive deformable member 42 , which is mounted on the closing member 31 and is connected to the opening member 41 and which is deformable so as to rotate the opening member 41 depending on the temperature of the fuel contacting the temperature-sensitive deformable member 42 .
  • the opening member 41 is coupled to the lower surface of the closing member 31 via a hinge pin 41 a and is rotatable about the hinge pin 41 a.
  • the temperature-sensitive deformable member 42 may be composed of a bimetal having a thin coil shape, and may be coupled to the lower surface (the outer surface) of the mesh filter 11 , that is, the lower surface of the closing member 31 .
  • the closing member 31 may be provided on the lower surface thereof with a guide 43 , which is arranged along the spiral pathway of the deformable member 42 .
  • the guide 43 serves to prevent separation of the deformable member 42 while guiding the deformable member 42 .
  • the first end 42 a of the deformable member 42 is fixed to the lower surface of the closing member 31 , and the second end 42 b of the deformable member 42 is connected to the opening member 41 .
  • the deformable member 42 is mounted on the lower surface of the mesh filter 11 , that is, the lower surface of the closing member 31 , and the opening member 41 is rotatably mounted on the lower surface of the closing member 31 so as to open and close the introduction hole 31 a formed in the closing member 31 .
  • the rotational position and the state of the opening member 41 are determined according to the position of the second end 42 b .
  • the position of the second end 42 b is changed according to the deformed state of the deformable member 42 and the temperature of fuel.
  • the deformable member 42 which is in contact with the fuel in the fuel tank, expands due to the high temperature of the fuel.
  • the second end 42 b of the deformable member 42 pushes the opening member 41 .
  • the opening member 41 closes the introduction hole 31 a in the closing member 31 , with the result that the fuel can pass only through the second mesh member 22 b but not through the first mesh member 22 a.
  • the second end 42 b of the deformable member 42 is maintained in the state in which the opening member 41 is closed because the deformable member 42 , which is made of a bimetal expands.
  • the deformable member 42 which is in contact with the fuel in the fuel in the fuel tank, contracts due to the low temperature of the fuel, as illustrated in FIG. 9 .
  • the second end 42 b of the deformable member 42 pulls the opening member 41 .
  • the opening member 41 is rotated so as to open the introduction hole 31 a in the closing member 31 , thereby allowing the fuel to pass through the first mesh member 22 a.
  • the fuel containing the paraffin wax component can pass through the introduction hole 31 a and the first mesh member 22 a having a larger mesh size. Since the fuel is introduced into the filter, it is possible to prevent the problem of clogging of the filter.
  • the mesh filter for a fuel system of a vehicle is constructed such that the fuel path in the first mesh member having a larger mesh size is opened so as to allow the fuel containing the paraffin wax component to pass through the first mesh member when the fuel in the fuel tank is at a low temperature at which solid paraffin wax may form in the fuel. Consequently, the fuel is allowed to be supplied to the inside of the filter even under a low-temperature condition.
  • the fuel path in the first mesh member is obstructed when the temperature of the fuel is increased, the foreign substances in the fuel cannot pass through the first mesh member having a larger mesh size, and the fuel can pass only through the second mesh member capable of removing the foreign substances. Accordingly, there is an advantage in that it is possible to prevent the problem of clogging of the filter by a paraffin wax component while preventing the introduction of foreign substances.
  • the mesh filter according to the form of the present disclosure is able to solve the problems of introduction of air into the introduction pipe, generation of a large amount of air bubbles in the path for fuel supply, deterioration of fuel supply, deterioration of initial startup performance of an engine, shutdown of an engine during travelling, insufficient output of an engine, deterioration of acceleration performance of a vehicle and the like.
  • the mesh filter for a fuel system of a vehicle is able to solve conventional problems caused by clogging of the filter with paraffin wax.
  • the mesh filter according to the present disclosure is able to solve problems of clogging of the filter with paraffin wax, the introduction of air into the introduction pipe and the generation of air bubbles in the path for fuel supply and various problems caused thereby while normally removing foreign substances contained in fuel.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Transportation (AREA)
  • Textile Engineering (AREA)
  • Filtration Of Liquid (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
US16/678,611 2019-07-24 2019-11-08 Mesh filter for fuel supply system of vehicle Abandoned US20210023479A1 (en)

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CN112302845A (zh) 2021-02-02
US20230226467A1 (en) 2023-07-20

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