WO2021167692A1 - Exhaust fan for a commercial kitchen - Google Patents
Exhaust fan for a commercial kitchen Download PDFInfo
- Publication number
- WO2021167692A1 WO2021167692A1 PCT/US2020/065921 US2020065921W WO2021167692A1 WO 2021167692 A1 WO2021167692 A1 WO 2021167692A1 US 2020065921 W US2020065921 W US 2020065921W WO 2021167692 A1 WO2021167692 A1 WO 2021167692A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling air
- fan
- motor
- housing
- air
- Prior art date
Links
- 238000001816 cooling Methods 0.000 claims abstract description 98
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 15
- 239000004519 grease Substances 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010411 cooking Methods 0.000 description 5
- 230000005465 channeling Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/06—Helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
- F04D29/4253—Fan casings with axial entry and discharge
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
Definitions
- the present invention relates to exhaust systems and more particularly to exhaust systems designed to exhaust air from commercial kitchen appliances, such as kitchen hoods.
- exhaust systems for exhausting air from appliances, such as kitchen hoods and dishwashers.
- appliances such as kitchen hoods and dishwashers.
- the air exhausted therefrom is typically laden with grease and is of a relatively high temperature, sometimes approaching 300°F.
- exhaust systems include a fan driven by a motor. These typically lie in the exhaust air stream being directed from the kitchen appliances to a point outside of the building containing the kitchen.
- the motor is asked to perform in a hot environment. This hot environment impacts the performance and life of the motor which in turn results in the motor requiring replacement too often and also contributes to increased maintenance cost.
- the present invention relates to an exhaust fan for exhausting air from an appliance in a commercial kitchen.
- the exhaust fan includes a motor for driving a fan.
- a motor compartment at least partially encloses the motor.
- cooling air in the motor compartment is directed into what is termed a cooling air snorkel that extends from the motor compartment and around the fan to where the snorkel includes a terminal end that discharges the cooling air adjacent the low pressure side of the fan.
- the cooling air discharged by the snorkel is mixed with exhaust air to form an air mixture and the air mixture is exhausted through a housing containing the motor, motor compartment and fan.
- the present invention in one embodiment also comprises a method or process for cooling the motor of an exhaust fan incorporated into a commercial kitchen.
- the exhaust fan includes a motor for driving a fan and there is provided a motor compartment that at least partially encases the motor.
- the method or process for cooling the motor includes inducing cooling air into cooling air inlets formed in the side walls of a housing that contains the motor and fan. From the cooling air inlets, the method or process entails directing the cooling air through one or more conduits or tubes into the motor compartment where the cooling air passes in and around the motor and in the process cools the same. Thereafter, at least some of the cooling air in the motor compartment is directed through the snorkel that extends from the motor compartment and around the fan.
- the snorkel includes a terminal end that is located on the low pressure side of the fan. Cooling air discharged from this terminal end is mixed with the exhaust air to form an air mixture that is exhausted through the housing containing the fan, motor and motor compartment.
- the open terminal end of the cooling air snorkel is located in a low pressure zone adjacent the inlet end of the fan.
- it is the low pressure zone that induces cooling air to enter the housing and flow around the motor in the motor compartment and to flow out the cooling air snorkel. Effectively, the cooling air is drawn into the motor compartment due to the low pressure zone existing on the inlet side of the fan.
- all or substantially all of the cooling air is discharged through the snorkel.
- only a part of the cooling air in the motor compartment is discharged via the snorkel.
- a portion of the cooling air in the motor compartment is exhausted through a front motor plate disposed between the motor and the fan. This cooling air is also mixed with the exhaust air.
- Figure 1 is a schematic illustration of a commercial kitchen having the exhaust fan incorporated into an air exhaust system for exhausting air from the commercial kitchen.
- Figure 2 is a side elevational view of the exhaust fan with a side panel being removed to better illustrate the internal components of the exhaust fan.
- Figure 3 is a view similar to Figure 2 but rotated 90° and where another side panel is removed to illustrate the internal components of the exhaust fan.
- an exhaust fan is shown therein and indicated generally by the numeral 10.
- the exhaust fan 10 is provided with a cooling system for cooling an electric motor which forms a part of the exhaust fan.
- Exhaust fan 10 is particularly adapted to exhaust air from a commercial kitchen indicated generally by the numeral 12. See Figure 1.
- Commercial kitchen 12 includes one or more appliances served by an exhaust system that exhausts air from the commercial kitchen.
- the commercial kitchen includes a kitchen hood 14 that is disposed over cooking surfaces. Exhaust air is pulled over cooking surfaces and through the kitchen hood 14 by the exhaust fan 10 and ultimately exhausted from the building housing the commercial kitchen. Details of the kitchen hood 14 are not dealt with herein because kitchen hood designs are well known and appreciated by those skilled in the art. For a more complete understanding of kitchen hoods and their designs, one is referred to U.S. Patents 7,963,382 and 8,378,834, the disclosures of which are expressly incorporated herein by reference.
- FIG. 1 schematically illustrates one example. Exhaust air pulled over the cooking surfaces is induced upwardly through the kitchen hood 14 and into a first duct 16.
- the first duct 16 is operatively connected between the kitchen hood 14 and the exhaust fan 10.
- a second duct 18 is operatively connected to the downstream end of the exhaust fan 10 and in the case of this example includes an elbow that enables a portion of the duet to extend through the roof of a building housing the commercial kitchen where exhaust air is exhausted.
- the exhaust fan 10 includes a housing 20.
- the housing includes a top, bottom and a pair of sides with the opposite ends being generally open to permit air to pass there through.
- a motor 22 is mounted in the housing 20.
- a fan 24 is operatively connected to the motor and driven thereby.
- fan 24 is a direct drive fan. It is understood and appreciated, however, by those skilled in the art that some embodiment might include an indirect driven fan.
- the term "fan” should be construed broadly to include any fan or device for moving air through the housing 20.
- fan 24 is generally referred to as a wheel fan. It includes primary blades 24A and secondary blades 24B.
- a motor compartment 28 at least partially encloses or encases the motor 22.
- Motor compartment 28 functions to protect the motor from grease-laden exhaust air that passes through the housing 20 and at the same time, as illustrated below, facilitates the cooling of the motor 22 during operation.
- the exhaust fan is designed to induce cooling air into the housing and into the motor compartment and over and around the motor 22 to cool the same.
- the housing is provided with one or more cooling air inlets 26.
- the function of the cooling air inlets 26 is to enable air outside of the housing 20 to enter the housing for purposes of cooling the motor 22.
- Each cooling air inlet 26 is operatively connected to a conduit or tube 36. See Figure 3.
- Cooling air conduits 36 are operatively connected to the cooling air inlets 26 and extend therefrom towards the motor compartment 28.
- the cooling air conduits 36 can be directly coupled to the motor compartment 28 or can be joined to a manifold 29 that in turn is connected to the motor compartment 28. See Figure 3.
- cooling air conduits 36 are designed to channel cooling air from the cooling air inlets 26 into the motor compartment 28. Once in the motor compartment, the cooling air circulates in and around the motor 22 and cools the same in the process.
- cooling air snorkel 32 Operatively connected to the motor compartment 28 is what is referred to as a cooling air snorkel 32. See Figure 2.
- the function of the cooling air snorkel 32 is to discharge at least some of the cooling air from the motor compartment. More particularly, cooling air in the motor compartment 28 is induced into the cooling air snorkel 32 and exhausted out a terminal end thereof. Note that the cooling air snorkel 32 tends to bow or curve around the fan 24 and in this case, the terminal end 32A of the snorkel is connected to a Venturi or exhaust air inlet 30 that is disposed in the inlet end of the exhaust fan 10.
- the term "cooking air snorkel” means a tube or conduit that is designed to extend between the motor compartment and the low pressure side of the fan 24 for the purpose of channeling cooling air from the motor compartment to the low pressure side of the exhaust fan.
- a low pressure zone or area 34 is formed on the inlet side of the fan 24.
- This low pressure zone 34 serves to induce cooling air into the motor compartment 28. That is, in this embodiment, the low pressure zone 34 is disposed at least partially within the confines of the Venturi 30 and as such the terminal end 32A of the cooling air snorkel 32 is open to this low pressure zone. Because of the presence of the low pressure zone, cooling air is induced to move into and through the cooking air inlets 26 and through the cooling air conduits 36 into the motor compartment 28 and from the motor compartment through the cooling air snorkel 32 to where the cooling air is exhausted on the low pressure side of the fan 24.
- a plate Disposed between the motor 22 and fan 24 is a plate referred to as a front motor plate.
- the front motor plate is also disposed between the motor compartment 28 and the fan 24.
- the motor plate includes openings that are open to the motor compartment 28.
- cooling air in the motor compartment 28 can flow out through the openings in the motor plate.
- the fan 24 When the fan 24 is driven, its secondary blades 24B (see Figures 2 and 3) induces cooling air from the motor compartment 28 through the openings in the motor plate and generally outwardly.
- this cooling air i.e. the cooling air induced by the secondary blades 24B to flow from the motor compartment 28 through the motor plate, is referenced by arrows 40.
- cooling air is discharged from the motor compartment 28 through the snorkel 32, as well as through the openings in the motor plate.
- exhaust air (arrows 42) from the kitchen hood 14 enters the Venturi 30.
- cooling air discharged from the snorkel 32 enters the Venturi 30.
- cooling air induced by the secondary blades 24B and passing through the motor plate enters the housing downstream of the Venturi 30.
- the exhaust fan 10 is generally horizontally oriented.
- the exhaust fan 10 includes a grease pan 38 (figure 2) in the bottom of the housing 20 that functions to catch and hold grease that is separated from the air mixture passing through the housing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20920617.6A EP4107437A4 (en) | 2020-02-20 | 2020-12-18 | Exhaust fan for a commercial kitchen |
CA3168338A CA3168338C (en) | 2020-02-20 | 2020-12-18 | Exhaust fan for a commercial kitchen |
AU2020429472A AU2020429472B2 (en) | 2020-02-20 | 2020-12-18 | Exhaust fan for a commercial kitchen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16/795,888 US11204177B2 (en) | 2020-02-20 | 2020-02-20 | Exhaust fan for a commercial kitchen |
US16/795,888 | 2020-02-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021167692A1 true WO2021167692A1 (en) | 2021-08-26 |
Family
ID=77366881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2020/065921 WO2021167692A1 (en) | 2020-02-20 | 2020-12-18 | Exhaust fan for a commercial kitchen |
Country Status (5)
Country | Link |
---|---|
US (1) | US11204177B2 (en) |
EP (1) | EP4107437A4 (en) |
AU (1) | AU2020429472B2 (en) |
CA (1) | CA3168338C (en) |
WO (1) | WO2021167692A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117770A (en) * | 1961-04-19 | 1964-01-14 | Crom B Campbell | Combination air warming and centrifugal fan unit for transmitting heated air |
US20070202795A1 (en) * | 2006-02-24 | 2007-08-30 | Greenheck Fan Corporation | Induced flow fan with outlet flow measurement |
US20130011239A1 (en) * | 2010-09-03 | 2013-01-10 | Daniel Khalitov | Tubular inline exhaust fan assembly |
US20180135651A1 (en) * | 2016-11-15 | 2018-05-17 | Carnes Company, Inc. | Centrifugal fan assembly |
EP3524823A1 (en) * | 2018-02-07 | 2019-08-14 | DLK Ventilatoren GmbH | Radial fan with motor cooling |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7522890U (en) * | 1975-07-18 | 1976-01-02 | Wilhelm Gebhardt Gmbh, 7112 Waldenburg | ROOF FAN |
DE4104034A1 (en) * | 1991-02-09 | 1992-08-13 | Opel Adam Ag | FAN AND AIR CONDITIONING WITH SUCH A FAN |
DE29915015U1 (en) * | 1999-08-27 | 1999-10-21 | Gebhardt Ventilatoren | Wall fan |
CN2773355Y (en) * | 2005-03-02 | 2006-04-19 | 上海诺地乐通用设备制造有限公司 | Upward air exhausting device on roof |
US20130101402A1 (en) * | 2011-10-24 | 2013-04-25 | Hamilton Sundstrand Corporation | Fan housing with cooling slots |
US8679210B2 (en) * | 2012-01-17 | 2014-03-25 | Hamilton Sundstrand Corporation | Shrouded particle separator |
US11139718B2 (en) * | 2017-07-21 | 2021-10-05 | Siemens Industry, Inc. | Electric machine with auxiliary blower mounting arrangement and/or modular exhaust assembly |
TWI701368B (en) * | 2018-01-25 | 2020-08-11 | 賀欣機械廠股份有限公司 | Heat exhaust driving device of sewing machine |
-
2020
- 2020-02-20 US US16/795,888 patent/US11204177B2/en active Active
- 2020-12-18 EP EP20920617.6A patent/EP4107437A4/en active Pending
- 2020-12-18 CA CA3168338A patent/CA3168338C/en active Active
- 2020-12-18 WO PCT/US2020/065921 patent/WO2021167692A1/en active Application Filing
- 2020-12-18 AU AU2020429472A patent/AU2020429472B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3117770A (en) * | 1961-04-19 | 1964-01-14 | Crom B Campbell | Combination air warming and centrifugal fan unit for transmitting heated air |
US20070202795A1 (en) * | 2006-02-24 | 2007-08-30 | Greenheck Fan Corporation | Induced flow fan with outlet flow measurement |
US20130011239A1 (en) * | 2010-09-03 | 2013-01-10 | Daniel Khalitov | Tubular inline exhaust fan assembly |
US20180135651A1 (en) * | 2016-11-15 | 2018-05-17 | Carnes Company, Inc. | Centrifugal fan assembly |
EP3524823A1 (en) * | 2018-02-07 | 2019-08-14 | DLK Ventilatoren GmbH | Radial fan with motor cooling |
Non-Patent Citations (1)
Title |
---|
See also references of EP4107437A4 * |
Also Published As
Publication number | Publication date |
---|---|
CA3168338A1 (en) | 2021-08-26 |
AU2020429472B2 (en) | 2023-08-31 |
AU2020429472A1 (en) | 2022-09-15 |
EP4107437A1 (en) | 2022-12-28 |
US11204177B2 (en) | 2021-12-21 |
CA3168338C (en) | 2024-03-19 |
EP4107437A4 (en) | 2024-02-28 |
US20210262673A1 (en) | 2021-08-26 |
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