US20190234419A1 - Axial fan with tip fences - Google Patents

Axial fan with tip fences Download PDF

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Publication number
US20190234419A1
US20190234419A1 US16/261,380 US201916261380A US2019234419A1 US 20190234419 A1 US20190234419 A1 US 20190234419A1 US 201916261380 A US201916261380 A US 201916261380A US 2019234419 A1 US2019234419 A1 US 2019234419A1
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US
United States
Prior art keywords
fan
hub
axial flow
casing
fan blades
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
US16/261,380
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English (en)
Inventor
Ryan K. Dygert
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.)
Carrier Corp
Original Assignee
Carrier 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 Carrier Corp filed Critical Carrier Corp
Priority to US16/261,380 priority Critical patent/US20190234419A1/en
Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DYGERT, RYAN K.
Publication of US20190234419A1 publication Critical patent/US20190234419A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0404—Cases or cabinets of the closed type
    • A47F3/0408—Cases or cabinets of the closed type with forced air circulation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type
    • A47F3/0443—Cases or cabinets of the open type with forced air circulation
    • A47F3/0447—Cases or cabinets of the open type with forced air circulation with air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
    • F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/20—Specially-shaped blade tips to seal space between tips and stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/11—Shroud seal segments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade

Definitions

  • Embodiments of the present disclosure generally relate to a refrigerated display merchandiser, and more particularly, to a fan assembly for use in a refrigerated display merchandiser where food and/or beverages are displayed.
  • supermarkets and convenient stores are equipped with display cases or merchandisers, which may be open or provided with doors, for presenting fresh food or beverages to customers, while maintaining the fresh food and beverages in a refrigerated environment.
  • the refrigeration systems of such merchandisers commonly employ a conventional refrigeration cycle and include an evaporator and evaporator fan operatively associated with the refrigerated interior of the cabinet, as well as a condenser, a condenser fan, and compressor.
  • a refrigerant is circulated by a compressor through refrigerant lines connecting the compressor, the condenser, and the evaporator in a conventional manner to form a closed circuit.
  • cold, moisture-bearing air is provided to the product display zone of the display case by passing air over the heat exchange surface of the evaporator.
  • heat is absorbed from the air passing over the evaporator so as to lower the temperature of the air.
  • the path of the air provided to the evaporator fan is torturous and includes multiple 90 degree turns and downstream obstructions. Accordingly, integration of axial fan without affecting both performance and noise of the merchandiser can be challenging.
  • an axial flow fan includes a generally hollow casing defining an inlet end and an outlet end of the axial flow fan. A diameter of the casing increases from the inlet end to the outlet end.
  • An impeller is rotatably mounted within the casing. The impeller includes a hub and a plurality of fan blades extending from a root located at the hub to a blade tip. A diameter of the blade tip of each of the plurality of fan blades increases from the inlet end to the outlet end.
  • a tip fence is located at the blade tip of at least one of the plurality of fan blades and a length of the tip fence measured perpendicular to the fan blades is greater than a thickness of the at least one of the plurality of fan blades.
  • an axial clearance measured parallel to the diameter of the casing, is defined between the tip fence of each of the plurality of fan blades and an adjacent surface of the casing and the axial clearance remains constant between the inlet end and the outlet end of the axial flow fan with a tolerance of +/ ⁇ 1 mm.
  • an outer diameter of the hub increases from the inlet end to the outlet end.
  • the increase in the diameter of the hub from the inlet end to the outlet end is generally equal to the increase in the diameter of the casing from the inlet end to the outlet end.
  • the hub has a radially stepped configuration extending in the circumferential direction.
  • a ratio of the axial length of the tip fence to the thickness of the at least one of the plurality of fan blades is between 2 and 10.
  • the tip fence has a generally constant thickness.
  • a thickness of the tip fence varies.
  • each of the plurality of fan blades includes a first surface and a second, opposite surface, and the tip fence extends beyond both the first surface and the second surface of the at least one of the plurality of fan blades.
  • each of the plurality of fan blades has a leading edge and a trailing edge, and the tip fence extends beyond at least one of the leading edge and the trailing edge of the at least one of the plurality of fan blades.
  • the tip fence is integrally formed with the at least one of the plurality of fan blades.
  • the casing has a bellmouth contour.
  • the casing further comprises a stationary hub oriented in alignment with the hub and a plurality of structural members extending radially outward from the stationary hub to couple the casing to the stationary hub.
  • At least one of the stationary hub and the plurality of structural members has one or more openings to allow an airflow to pass there through.
  • the axial flow fan is mounted in a refrigerated display cabinet.
  • the hub and the plurality of fan blades are formed separately.
  • the hub and the plurality of fan blades are integrally formed.
  • a refrigerated merchandiser includes a cabinet defining a product display area and having a compartment separate from the product display area.
  • An air circulation circuit fluidly couples the compartment and the product display area and an air circulating fan moves a flow of air axially through the air circulation circuit.
  • the air circulating fan includes a generally hollow casing. A diameter of the casing increases along an axial length of the air circulating fan.
  • a fan rotor is rotatably mounted within the casing and has a hub and a plurality of fan blades extending from a root located at the hub to a blade tip. A diameter of the blade tip of each of the plurality of fan blades increases along an axial length of the air circulating fan.
  • a tip fence is located at a tip of at least one of the plurality of fan blades. An axial length of the tip fence is greater than a thickness of the at least one of the plurality of fan blades.
  • a ratio of the axial length of the tip fence to the thickness of the at least one of the plurality of fan blades is between 2 and 10.
  • a clearance is defined between a blade tip of the plurality of fan blades and a surface of the casing and the clearance remains constant between the inlet end and the outlet end of the axial flow fan.
  • a diameter of the hub increases over an axial length of the air circulating fan, and the increase in the diameter of the hub over the axial length of the air circulating fan is generally equal to the increase in the diameter of the casing over the axial length of the air circulating fan.
  • an opening is defined between the casing and the hub, and a width of the opening remains generally constant over the axial length of the axial flow fan.
  • FIG. 1 is perspective view of a fan assembly according to an embodiment
  • FIG. 2 is a front view of the fan assembly of FIG. 1 according to an embodiment
  • FIG. 3 is a back view of the fan assembly of FIG. 1 according to an embodiment
  • FIG. 4 is a cross-sectional view of the fan assembly of FIG. 1 according to an embodiment
  • FIG. 5 is a perspective detailed view of a fan blade of the fan assembly of FIG. 1 according to an embodiment
  • FIG. 6 is a side view of the fan blade of FIG. 5 according to an embodiment.
  • FIG. 7 is a schematic diagram of a refrigerated display merchandiser including a fan assembly according to an embodiment.
  • a fan assembly 20 utilized, for example in a heating, ventilation and air conditioning (HVAC) system to draw air over an evaporator is illustrated.
  • HVAC heating, ventilation and air conditioning
  • the fan assembly 20 is an axial flow fan; however, it should be understood that other suitable types of fans, such as a mixed flow fan for example, are also within the scope of the disclosure.
  • the fan assembly 20 includes a fan rotor or impeller 22 including a plurality of fan blades 24 .
  • the plurality of fan blades 24 is generally equidistantly spaced about an outer periphery of a rotor hub 26 and extends radially outwardly from the hub 26 into an opening 28 defined between the hub 26 and an outer casing 30 .
  • the radially outer end 32 of each of the fan blades 24 is separate. Accordingly, the fan rotor 22 does not include a fan shroud.
  • the fan blades 24 may be separate components coupled to the hub 26 , or alternatively, the blades 24 and hub 26 may be integrally formed, such as from an injection molded plastic for example.
  • a motor 34 operably coupled to the fan rotor 22 may be used to rotate the fan hub 26 and the fan blades 24 about the fan axis X to cause air A to be drawn in and pass through the opening 28 .
  • the motor 34 may be oriented such that an axis of rotation of the motor 34 is arranged generally parallel to or coaxial with the fan axis X.
  • the fan assembly 20 includes a stationary hub 36 arranged adjacent the rotor hub 26 and connected to the casing 30 via one or more structural members 38 . As shown, the structural members 38 may be generally hollow to minimize interference with the airflow A.
  • the motor 34 may be affixed to the stationary hub 36 at the inlet 40 of the fan assembly 20 .
  • the fan rotor 22 is rotated at relatively high speeds to induce the flow of air A through the casing 30 , and in the process it creates a swirl in the direction of the fan rotation, such that the air A may have both an axial component and a tangential component.
  • the casing 30 is formed having a bellmouth contour extending towards the outlet end 42 thereof.
  • the inner diameter of the casing 30 generally increases from the inlet end 40 of the fan assembly 20 to the outlet end 42 of the fan assembly 20 .
  • the bellmouth contour of the casing 30 diffuses the radial flow at the outlet 42 of the fan assembly 20 to facilitate turning of the airflow A.
  • the outer diameter of the rotor hub 26 may gradually increase along the path of the airflow A through the fan assembly 20 .
  • the increase in the diameter of the rotor hub 26 is generally equal to the increase in the inner diameter of the casing 30 such that the width of the opening 28 defined between the rotor hub 26 and the casing 30 remains generally constant between the inlet end 40 and the outlet end 42 of the fan assembly 20 .
  • the clearance between the rotor hub 26 and the casing 30 includes a tolerance of +/ ⁇ 1 mm.
  • the hub 26 has a radially stepped configuration extending in the circumferential direction. Inclusion of the radial steps eliminates the need for undercuts in the associated production tooling that would otherwise form on the downstream surfaces of the blades. This reduces tooling complexity without sacrificing airflow performance benefit.
  • the fan rotor 22 may include any number of fan blades 24 . In the illustrated, non-limiting embodiment, the rotor 22 includes seven fan blades 24 . However, it should be understood that a fan assembly 20 having any configuration including two or more blades 24 is contemplated herein.
  • the plurality of fan blades 24 may be, but need not be substantially identical.
  • each fan blade 24 has a root 44 where the fan blade 24 attaches to the hub 26 and a tip 32 at the outer extremity of the blade 24 , opposite the root 44 .
  • Each blade 24 additionally has a leading edge 46 located upstream with respect to a direction of rotation and a trailing edge 48 location downstream with respect to the direction of rotation. The leading and trailing edges 46 , 48 are joined together at the root 44 and the tip 32 .
  • the fan blades 24 have a sweep, for example in the direction opposite the direction of fan rotation X, referred to as reverse or backward sweep.
  • fan blades 24 having a sweep in the direction of the fan rotation also referred to as forward sweep
  • fan blades 24 having no sweep such that the tips 32 of the fan blades 24 are arranged generally within a plane are also contemplated herein.
  • the “span” of the fan blade 24 as referred to herein is intended to describe the distance between the root 44 and the tip 32 .
  • the span varies along each of the fan blades 24 , such as between a leading and trailing edge 46 , 48 for example.
  • the fan blades 24 may include a radially expanding tip 32 . Accordingly, the span of the fan blade 24 generally increases from adjacent a first edge, such as the leading edge 46 for example, to a second, opposite edge, such as the trailing edge 48 for example.
  • the distance between the inner surface 50 of the casing 30 and a first portion of a fan blade 24 is greater than the distance between the inner surface 50 of the casing 30 and a second portion of the fan blade 24 .
  • embodiments where the span of the fan blade 24 gradually increases from the trailing edge 48 to the leading edge 46 and embodiments where the span changes over only a portion of the fan blade 24 are also contemplated herein.
  • each fan blade 24 Disposed at the tip 32 of each fan blade 24 is a fence 52 .
  • the tip fence 52 may be removably coupled to the fan blade 24 , or alternatively, may be integrally formed therewith.
  • the fan rotor 22 may be formed by a straight-pull injection molding process, or through an additive manufacturing process.
  • Each tip fence 52 may span the entire peripheral length of the tip 32 , or alternatively, may extend over only a portion of the periphery of the fan blade 24 .
  • the tip fence 52 extends forward of the leading edge 46 of the fan blade 24 but is truncated adjacent the trailing edge 48 of the fan blade 24 .
  • configurations where the tip fence 52 does not extend to the leading edge 46 and/or extends beyond the trailing edge 48 are also considered within the scope of the disclosure.
  • the tip fence 52 extends generally perpendicular to the body of the fan blade 24 and has an axial length greater than the thickness of the fan blade 24 .
  • the axial length of the tip fence 52 may be at least double and up to about 5 times, or about 10 times the thickness of the fan blade 24 .
  • the tip fence 52 may have a generally constant thickness, or alternatively, may gradually decrease in thickness away from the fan blade 24 .
  • the tip fence 52 generally extends beyond at least one of a first surface 54 and a second, opposite surface 56 of the fan blade 24 .
  • the tip fence 52 extends axially beyond both the first surface 54 and the second surface 56 to form a partial shroud for a corresponding fan blade 24 .
  • the tip fence 52 manages the clearance gap leakage flow across the blade tip 32 and reduces sensitivity to inflow distortion, thereby reducing noise.
  • the clearance between the rotor hub 26 and an adjacent surface of the casing 30 is generally constant within a nominal tolerance of +/ ⁇ 1 mm. This clearance is defined between the tip fence 52 of each fan blade 24 and the casing 30 .
  • the refrigerated display merchandiser 100 includes an outer cabinet 102 and an inner cabinet liner 104 that defines within its bounds a product display region 106 .
  • the product display region 106 may be open, as shown in the FIG., or enclosed.
  • Refrigerated goods 108 may be stored on shelves 110 , which are mounted in a known manner within the product display region 106 .
  • Several orifices 112 may direct cool air from a back wall 114 into the product display region 106 . The air is configured to cool the display space 106 and refrigerate the products 108 contained therein.
  • the refrigerated display merchandiser 100 houses one or more components associated with a vapor-refrigeration cycle.
  • an evaporator 120 may be disposed within the merchandiser 100 , in a compartment 122 separate from the product display area 106 .
  • the compartment 122 is illustrated as being located below the product display area 106 in the illustrated, non-limiting embodiment, systems where the compartment 122 is located behind or above the product display area 106 are also within the scope of the disclosure.
  • Cool air passing over the evaporator 120 is circulated by an air circulation mechanism 124 , such as fan assembly 20 for example, into the product display region 106 through the air flow passages defined by the orifices 112 formed in the wall 114 of the cabinet 100 into the product display area 106 to maintain the products 108 located therein a desired temperature.
  • the air circulation mechanism 124 is mounted between the outer cabinet 102 and the inner cabinet liner 104 such that the air flow provided to the mechanism 124 has a tortuous path including multiple 90 degree turns.
  • An axial flow fan comprising: a generally hollow casing defining an inlet end and an outlet end of the axial flow fan, wherein a diameter of the casing increases from the inlet end to the outlet end; an impeller rotatably mounted within the casing, the impeller including: a hub; a plurality of fan blades extending from a root at the hub to a blade tip, wherein a diameter of the blade tip of each of the plurality of fan blades increases from the inlet end to the outlet end; and a tip fence located at the blade tip of at least one of the plurality of fan blades, wherein a length of the tip fence measured perpendicular to the fan blades is greater than a thickness of the at least one of the plurality of fan blades.
  • a ratio of the axial length of the tip fence to the thickness of the at least one of the plurality of fan blades is between 2 and 10.
  • each of the plurality of fan blades includes a first surface and a second, opposite surface, and the tip fence extends beyond both the first surface and the second surface of the at least one of the plurality of fan blades.
  • each of the plurality of fan blades has a leading edge and a trailing edge, and the tip fence extends beyond at least one of the leading edge and the trailing edge of the at least one of the plurality of fan blades.
  • a refrigerated merchandiser comprising: a cabinet defining a product display area and having a compartment separate from the product display area; an air circulation circuit fluidly coupling the compartment and the product display area; and an air circulating fan for moving a flow of air axially through the air circulation circuit, the air circulating fan including: a generally hollow casing, wherein a diameter of the casing increases along an axial length of the air circulating fan; a fan rotor rotatably mounted within the casing and having a hub and a plurality of fan blades mounted at a root to the hub and extending to a blade tip, wherein a diameter of the blade tip of each of the plurality of fan blades increases along an axial length of the air circulating fan; and a tip fence located at a tip of at least one of the plurality of fan blades, wherein an axial length of the tip fence is greater than a thickness of the at least one of the plurality of fan blades.
  • a ratio of the axial length of the tip fence to the thickness of the at least one of the plurality of fan blades is between 2 and 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
US16/261,380 2018-01-31 2019-01-29 Axial fan with tip fences Abandoned US20190234419A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/261,380 US20190234419A1 (en) 2018-01-31 2019-01-29 Axial fan with tip fences

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862624483P 2018-01-31 2018-01-31
US16/261,380 US20190234419A1 (en) 2018-01-31 2019-01-29 Axial fan with tip fences

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US (1) US20190234419A1 (de)
EP (1) EP3521634B1 (de)
CN (1) CN110094362A (de)
ES (1) ES2940780T3 (de)

Cited By (5)

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USD910834S1 (en) * 2018-12-05 2021-02-16 Asia Vital Components Co., Ltd. Impeller for a fan
USD911512S1 (en) 2018-01-31 2021-02-23 Carrier Corporation Axial flow fan
EP3821768A1 (de) 2019-11-14 2021-05-19 Carrier Corporation Kühlvitrine mit luftstromführung
US11255339B2 (en) * 2018-08-28 2022-02-22 Honeywell International Inc. Fan structure having integrated rotor impeller, and methods of producing the same
EP4268678A1 (de) * 2022-02-24 2023-11-01 Carrier Corporation Kühlregal

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USD911512S1 (en) 2018-01-31 2021-02-23 Carrier Corporation Axial flow fan
USD1029234S1 (en) * 2018-01-31 2024-05-28 Carrier Corporation Axial flow fan
US11255339B2 (en) * 2018-08-28 2022-02-22 Honeywell International Inc. Fan structure having integrated rotor impeller, and methods of producing the same
USD910834S1 (en) * 2018-12-05 2021-02-16 Asia Vital Components Co., Ltd. Impeller for a fan
EP3821768A1 (de) 2019-11-14 2021-05-19 Carrier Corporation Kühlvitrine mit luftstromführung
EP4268678A1 (de) * 2022-02-24 2023-11-01 Carrier Corporation Kühlregal

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EP3521634B1 (de) 2023-03-01
ES2940780T3 (es) 2023-05-11
CN110094362A (zh) 2019-08-06

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