CN106246583B - A kind of centrifugal blower and its flow control methods - Google Patents
A kind of centrifugal blower and its flow control methods Download PDFInfo
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- CN106246583B CN106246583B CN201610696806.8A CN201610696806A CN106246583B CN 106246583 B CN106246583 B CN 106246583B CN 201610696806 A CN201610696806 A CN 201610696806A CN 106246583 B CN106246583 B CN 106246583B
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- pressure sensor
- snail tongue
- tongue
- drive mechanism
- centrifugal blower
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
-
- 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
- F04D29/422—Discharge tongues
-
- 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
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/301—Pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of centrifugal blower includes spiral case, impeller and snail tongue, it is characterised in that：Also include pressure sensor, master controller and drive mechanism, first pressure sensor is arranged on the lip of the tongue of snail tongue, second pressure sensor and second pressure sensor are separately mounted to inside and outside snail tongue the lip of the tongue, the signal output part of first pressure sensor, second pressure sensor and the 3rd pressure sensor is used for being connected with the signal input part of master controller, the signal output part control drive mechanism of master controller, drive mechanism are used for driving snail tongue and and then adjustment snail tongue gap.The centrifugal blower is by setting the snail tongue being dynamically adapted, the pressure change of the snail tongue ring wall that master controller gathers according to pressure sensor drives drive mechanism to be acted accordingly, so as to dynamic adjustment snail tongue depth and gap, lift the efficiency and air quantity when various flow operating mode is run, make the blower fan of range hood can keep high-efficiency operation always, efficiency and noise is better balanced, greatly promotes Consumer's Experience.
Description
Technical field
The present invention relates to a kind of centrifugal blower and its flow control methods.
Background technology
The blower fan system of range hood is more using small volume, flow and the larger more winged petiole centrifugal blowers of pressure at present,
Centrifugal blower typically all includes snail tongue, snail tongue to prevent a part of gas in spiral case internal circulation flow, snail tongue burble point
Position changes according to the change of flow, and snail tongue head is more deep, and its gap between impeller outlet is smaller, snail shell coiling part with
Leakage rate between volute outlet is also smaller.Although reduce the gap between snail tongue and impeller for lifting fan efficiency and pressure
Favorably, the adverse effect that noise but can be brought to increase simultaneously, therefore trade off performance is typically understood with making an uproar in general centrifugal blower
Sound and take an appropriate fixed value, but this fixed value be often it is effective to an operating mode, it is difficult to take into account other flow points
Operating mode.Found from day-to-day test and CFD analyses, with the increase of range hood resistance to flow output, operating mode constantly deteriorates, gas in snail
Stream is changed from big flow operating point to low discharge, and actual separation point has the significantly sidesway outward on the inside of the snail tongue with degrading
Dynamic trend, and snail tongue leading portion maximum pressure point also follows one to change, when operating condition off-design operating point, by
Influenceing backflow in the change of impeller speed triangle and export environment can cause centrifugal blower performance significantly to decline.At present, it is
Reduction noise, change snail tongue fillet often through the simple mode for axially becoming R at present, while make between snail tongue and impeller
Gap is changed, although can reduce a part of noise after making above-mentioned improvement to snail tongue structure, air quantity can diminish, through experiment
Learn, its air quantity is substantially all can be smaller than constant R snail tongue.In summary, in order to which efficiency and noise is better balanced, have
Treat to be further improved existing centrifugal fan structure.
The content of the invention
First technical problem to be solved by this invention is to be directed to above-mentioned state of the art, there is provided one kind can be according to snail
Tongue ring wall pressure change and adjust the centrifugal blower in snail tongue gap.
Second technical problem to be solved by this invention is to be directed to above-mentioned state of the art, there is provided one kind can balance wind
The flow control methods of the centrifugal blower of engine efficiency and noise.
Technical scheme is used by the present invention solves above-mentioned first technical problem：The centrifugal blower includes having snail tongue
Spiral case and the impeller that is arranged in spiral case, it is characterised in that：Also include pressure sensor, master controller and drive mechanism,
The first pressure sensor, second pressure sensor and the 3rd pressure that the pressure sensor includes being arranged on snail tongue ring wall pass
Sensor, the first pressure sensor are arranged on the lip of the tongue of snail tongue, the second pressure sensor and second pressure sensor
It is separately mounted to inside and outside described snail tongue the lip of the tongue, the first pressure sensor, second pressure sensor and the 3rd pressure
The signal output part of force snesor is used for being connected with the signal input part of the master controller, the signal output of the master controller
End controls the drive mechanism, and the drive mechanism is used for driving the snail tongue and and then between adjusting between snail tongue and impeller
Gap.
Preferably, the centrifugal blower also includes the first reference voltage regulator, the second reference voltage regulator, the 3rd base
Quasi- voltage regulator, first comparator, the second comparator and the 3rd comparator, the signal output part of the first pressure sensor
With the signal output part of the first reference voltage regulator first input end with the first comparator, the second input phase respectively
Even, the signal output part of the second pressure sensor and the signal output part of the second reference voltage regulator are respectively with described the
The first input end of two comparators, the second input are connected, the signal output part and the 3rd benchmark of the 3rd pressure sensor
First input end, second input of the signal output part of voltage regulator respectively with the 3rd comparator are connected, and described
Signal of the output end of the output end of one comparator, the output end of the second comparator and the 3rd comparator with the master controller
Input is connected.
In order that the data of three pressure sensors collection can more embody flow rate working conditions, described first pressure sensor,
Second pressure sensor and the 3rd pressure sensor are respectively mounted the centre of the snail tongue.
Preferably, described first pressure sensor, second pressure sensor and the 3rd pressure sensor are to be mounted on
Piezoelectricity sensor film on snail tongue ring wall surface.
As the preferred of any of the above-described scheme, described snail tongue include fixed seat, the snail tongue head below fixed seat with
And the flexible connection piece between fixed seat and snail tongue head is connected to, described fixed seat is fixed on spiral case, the first pressure
Sensor, second pressure sensor and the 3rd pressure sensor are installed on described snail tongue head, and the snail tongue head is driving
Seat movement and and then adjustment snail tongue gap are relatively fixed in the presence of mechanism.Flexible connection piece can typically use PET and silicon rubber
Glue etc. is easily deformed material and is made.Certainly, active connection can also use other soft in addition to using piece is flexibly connected
Property connector.
Further preferably, the guide pad along the length direction setting of snail tongue head is fixed with described snail tongue head,
The guide pad upper surface is provided with the guide groove set along guide pad length direction, and the guide groove is alongst oblique
To setting, described drive mechanism includes motor, by the turn-screw of the motor driven and on turn-screw
Nut slider, described motor are fixed on described fixed seat or spiral case, and described turn-screw is horizontally disposed with, the spiral shell
In the described guide groove of female sliding block insertion and by the guide pad described in the movable drive of nut slider and snail tongue head work
Lower synchronizing moving.
Further preferably, described guide groove is dovetail groove, and the bottom of the nut slider is formed and the dovetail groove phase
The stopper protrusion of cooperation.After dovetail groove and corresponding stopper protrusion, it can be ensured that movable with nut slider can band
Action-oriented block and snail tongue head make synchronizing moving up and down.
Further preferably, a travel switch is respectively provided with the both ends of the guide groove, is slid into the nut slider
In the state of being collided with the travel switch, described motor stalls.It is of course also possible to travel switch is installed into other conjunctions
Suitable position.
Technical scheme is used by the present invention solves above-mentioned second technical problem：The flow controlling party of the centrifugal blower
Method, it is characterised in that including following control process：
1., the pressure P of setting first pressure sensor collection1It is original state when maximum, between the snail tongue under original state
Gap is standard clearance；、
2., first pressure sensor sensing ambient windstream obtain pressure P1, second pressure sensor sensing ambient windstream obtains
To pressure P2, the 3rd pressure sensor induced environment air-flow obtains pressure P3；
3., by master controller to P1、P2And P3Carry out numerical value judgement；
If 4., P1Maximum, main controller controls drive mechanism stopping action, snail tongue gap is maintained at standard clearance；
If P2Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and increase snail tongue gap；
If P3Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and reduce snail tongue gap.
Compared with prior art, the advantage of the invention is that：The centrifugal blower is main by setting the snail tongue being dynamically adapted
Controller can drive drive mechanism to be acted accordingly according to the pressure change of the snail tongue ring wall of pressure sensor collection,
So as to dynamic adjustment snail tongue depth and gap, the efficiency and air quantity when various flow operating mode is run are lifted, makes the blower fan of range hood
High-efficiency operation can be kept always, efficiency and noise is better balanced, and greatly promote Consumer's Experience.
Brief description of the drawings
Fig. 1 is structural representation of the embodiment of the present invention under normal discharge operating mode；
Fig. 2 is the structural representation of another angle of centrifugal blower shown in Fig. 1；、
Fig. 3 is structural representation of the embodiment of the present invention under big flow operating mode after snail tongue adjustment；
Fig. 4 is structural representation of the embodiment of the present invention under low flow rate condition after snail tongue adjustment；
Fig. 5 is the structural representation of the snail tongue of the embodiment of the present invention；
Fig. 6 is the partial sectional view of the embodiment of the present invention；
Fig. 7 is the structured flowchart of the flow control methods of the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figures 1 to 6, the centrifugal blower in the present embodiment includes the spiral case 1 with snail tongue 3 and is arranged on spiral case 1
Interior impeller 2, the snail tongue 3 include fixed seat 31, flexible connection piece 32 and snail tongue first 33, and fixed seat 31 is fixed on spiral case 1,
Snail tongue first 33 is located at the lower section of fixed seat 31, and flexible connection piece 32 is engaged between fixed seat 31 and snail tongue first 33.
Before spiral case being fixed by screws in using direction shown in arrow A in Fig. 2 respectively to the front and rear sides of, fixed seat 31 as before
On lid 11 and spiral case bonnet 12, and the flanging 14 with spiral case ring wall 13 is connected simultaneously.Flexible connection piece 32 can use PET
With silicon rubber etc. material is easily deformed to make, be flexibly connected the both ends of piece 32 by be bonded or be engaged respectively with fixed seat 31 and
First 33 connection of snail tongue, down or when upper motion can in the snail tongue first 33 i.e. motion parts of snail tongue so as to ensure to be flexibly connected piece 32
To extend or shorten, and then it is adjusted the i.e. snail tongue gap in gap between snail tongue 3 and impeller 2.It is fixed in snail tongue first 33
There is the guide pad 4 along the length direction setting of snail tongue head, guide pad 4 can be synchronized with the movement with snail tongue first 33, in the upper table of guide pad 4
Face is provided with the guide groove 41 set along guide pad length direction, and guide groove 41 is alongst angularly disposed.This implementation
In example, guide groove 41 uses dovetail groove, and tilts obliquely from back to front.
Snail tongue first 33 forms snail tongue ring wall, first pressure sensor 71 is provided with the centre of snail tongue first 33, second pressure passes
The pressure sensor 73 of sensor 72 and the 3rd, also, first pressure sensor 71 is arranged on the lip of the tongue of snail tongue 3, and second pressure passes
The pressure sensor 73 of sensor 72 and the 3rd is separately mounted to inside and outside the lip of the tongue of snail tongue 3.In the present embodiment, first pressure passes
Sensor 71, the pressure sensor 73 of second pressure sensor 72 and the 3rd are the voltage inductance being mounted on the ring wall surface of snail tongue 3 should
Film.
As shown in fig. 7, the signal of the signal output part of first pressure sensor 71 and the first reference voltage regulator 81 is defeated
Going out end, the first input end with first comparator 91, the second input are connected respectively, the signal output of second pressure sensor 72
End and the signal output part first input end with the second comparator 92, the second input respectively of the second reference voltage regulator 82
It is connected, the signal output part of the 3rd pressure sensor 73 and the signal output part of the 3rd reference voltage regulator 83 are respectively with the 3rd
The first input end of comparator 93, the second input are connected, the output end of first comparator 91, the output end of the second comparator 92
It is connected with signal input part of the output end of the 3rd comparator 93 with master controller 10.The signal output part of master controller 10 is used
To control drive mechanism.
The present embodiment is moved up and down by drive mechanism to drive snail tongue first 33 to be relatively fixed seat 31, and then adjusts snail
Tongue room.Specifically, the drive mechanism includes motor 51, by the turn-screw 52 of motor driven and on turn-screw
Nut slider 53.Wherein, motor 51 uses stepper motor, and motor 51 is arranged on the rear side of fixed seat 31, the water of turn-screw 52
Flat to set, the rear end of turn-screw 52 is arranged on motor 51, before the front end of turn-screw 52 is rotatably arranged on fixed seat 31
Side, for example a mounting hole can be opened on front side of fixed seat, in the built-in upper bearing (metal) of mounting hole, the front end of turn-screw is mounted in should
In bearing.Nut slider 53 is embedded in guide groove 41, the bottom of nut slider 53 formed be engaged with dovetail groove it is spacing
Convex portion 531.So, guide pad 4 and snail tongue first 33 is driven to make synchronous up and down move by the movable can of nut slider 53
It is dynamic.In addition, being respectively provided with a travel switch 6 at the both ends of guide groove 41, slide into nut slider 53 and collided with travel switch 6
In the state of, motor 51 stops operating.
The flow control methods of centrifugal blower include following control process：
1., the pressure P of setting first pressure sensor collection1It is original state when maximum, between the snail tongue under original state
Gap is standard clearance；
2., first pressure sensor sensing ambient windstream obtain pressure P1, second pressure sensor sensing ambient windstream obtains
To pressure P2, the 3rd pressure sensor induced environment air-flow obtains pressure P3；
3., by master controller to P1、P2And P3Carry out numerical value judgement；
If 4., P1Maximum, main controller controls drive mechanism stopping action, snail tongue gap is maintained at standard clearance；Now,
For nut slider among turn-screw, the lip of the tongue of snail tongue is actual separation point.
If P2Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and increase snail tongue gap；Now, inhale
Lampblack absorber resistance to flow output is small, when air quantity is close to maximum point, range hood far beyond normal fume-exhausting needed for wind
Amount, for the actual separation point of snail tongue toward snail tongue medial movement, turn-screw drives nut slider driving snail tongue head up to move to increase
Big snail tongue gap, makes the lip of the tongue of snail tongue turn into actual separation point again, so as to significantly reduce noise, while raising efficiency,
Lift Consumer's Experience.
If P3Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and reduce snail tongue gap；Now, use
Family flue resistance increase, range hood smoke evacuation is difficult, and flow operating mode has changed to low flow rate condition point, the actual separation point of snail tongue
Mobile on the outside of toward snail tongue, turn-screw drives nut slider driving snail tongue head to move down to reduce snail tongue gap, makes snail tongue
The lip of the tongue turns into actual separation point again, so as to significantly reduce backflow, increase actual flow and efficiency so that in bad working environments
Under can still discharge oil smoke, lift Consumer's Experience.
Claims (8)
1. a kind of centrifugal blower, including the spiral case (1) with snail tongue (3) and the impeller (2) that is arranged in spiral case (1), in addition to
There are pressure sensor, master controller (10) and drive mechanism, the pressure sensor includes first be arranged on snail tongue ring wall
Pressure sensor (71), second pressure sensor (72) and the 3rd pressure sensor (73), the first pressure sensor (71)
The lip of the tongue installed in snail tongue (3), the second pressure sensor (72) and the 3rd pressure sensor (73) are separately mounted to institute
State inside and outside snail tongue (3) the lip of the tongue, the first pressure sensor (71), second pressure sensor (72) and the 3rd pressure
The signal output part of sensor (73) is used for being connected with the signal input part of the master controller (10), the master controller (10)
Signal output part control the drive mechanism, the drive mechanism is used for driving the snail tongue (3) and and then adjusts snail tongue (3)
The gap between impeller (2), it is characterised in that：Also include the first reference voltage regulator (81), the regulation of the second reference voltage
Device (82), the 3rd reference voltage regulator (83), first comparator (91), the second comparator (92) and the 3rd comparator (93),
The signal output part of the first pressure sensor (71) and the signal output part of the first reference voltage regulator (81) respectively with
First input end, the second input of the first comparator (91) are connected, and the signal of the second pressure sensor (72) is defeated
Go out end and the second reference voltage regulator (82) signal output part respectively the first input end with second comparator (92),
Second input is connected, the signal output part of the 3rd pressure sensor (73) and the letter of the 3rd reference voltage regulator (83)
Number first input end, second input of the output end respectively with the 3rd comparator (93) is connected, the first comparator
(91) output end of output end, the output end of the second comparator (92) and the 3rd comparator (93) with the master controller
(10) signal input part is connected.
2. centrifugal blower according to claim 1, it is characterised in that：Described first pressure sensor (71), the second pressure
Force snesor (72) and the 3rd pressure sensor (73) are respectively mounted the centre of the snail tongue (3).
3. centrifugal blower according to claim 1, it is characterised in that：Described first pressure sensor (71), the second pressure
Force snesor (72) and the 3rd pressure sensor (73) are the piezoelectricity sensor film being mounted on snail tongue (3) ring wall surface.
4. the centrifugal blower according to any claim in claims 1 to 3, it is characterised in that：Described snail tongue (3) bag
Include fixed seat (31), the snail tongue head (33) below fixed seat and the flexible connection being connected between fixed seat and snail tongue head
Piece (32), described fixed seat (31) are fixed on spiral case (1), the first pressure sensor (71), second pressure sensor
(72) it is installed in the 3rd pressure sensor (73) on described snail tongue head, effect of the snail tongue head (33) in drive mechanism
Under be relatively fixed seat movement and and then adjust snail tongue gap.
5. centrifugal blower according to claim 4, it is characterised in that：It is fixed with described snail tongue head (33) along snail
The guide pad (4) that the length direction of tongue is set, it is provided with along guide pad length direction and sets in the guide pad (4) upper surface
Guide groove (41), and the guide groove (41) is alongst angularly disposed, described drive mechanism include motor (51),
By the turn-screw (52) of the motor driven and the nut slider (53) on turn-screw, described motor (51)
It is fixed on described fixed seat (31) or spiral case, described turn-screw (52) is horizontally disposed, the nut slider (53)
Embedded described guide groove (41) is interior and passes through the guide pad (4) and snail tongue head (33) described in the movable drive of nut slider
Make synchronizing moving up and down.
6. centrifugal blower according to claim 5, it is characterised in that：Described guide groove (41) is dovetail groove, the spiral shell
The bottom of female sliding block (53) forms the stopper protrusion (53) being engaged with the dovetail groove.
7. centrifugal blower according to claim 5, it is characterised in that：One is respectively provided with the both ends of the guide groove (41)
Travel switch (6), in the state of the nut slider (53) slides into and collided with the travel switch (6), described motor
(51) stop operating.
A kind of 8. flow control methods of the centrifugal blower as described in any claim in claim 1 to 7, it is characterised in that bag
Include following control process：
1., the pressure P of setting first pressure sensor collection1It is original state when maximum, the snail tongue gap under original state is mark
Quasi- gap；、
2., first pressure sensor sensing ambient windstream obtain pressure P1, second pressure sensor sensing ambient windstream obtains pressure
P2, the 3rd pressure sensor induced environment air-flow obtains pressure P3；
3., by master controller to P1、P2And P3Carry out numerical value judgement；
If 4., P1Maximum, main controller controls drive mechanism stopping action, snail tongue gap is maintained at standard clearance；
If P2Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and increase snail tongue gap；
If P3Maximum, the action of main controller controls drive mechanism, and then drive snail tongue and reduce snail tongue gap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610696806.8A CN106246583B (en) | 2016-08-19 | 2016-08-19 | A kind of centrifugal blower and its flow control methods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610696806.8A CN106246583B (en) | 2016-08-19 | 2016-08-19 | A kind of centrifugal blower and its flow control methods |
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| CN106246583A CN106246583A (en) | 2016-12-21 |
| CN106246583B true CN106246583B (en) | 2018-03-13 |
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| CN108240353B (en) * | 2017-12-27 | 2024-03-29 | 宁波方太厨具有限公司 | Noise-reducing volute tongue of fan |
| CN108240354B (en) * | 2017-12-27 | 2024-04-02 | 宁波方太厨具有限公司 | Volute tongue and centrifugal fan provided with same |
| CN110081020B (en) * | 2018-01-25 | 2024-02-20 | 宁波方太厨具有限公司 | Fan volute tongue |
| CN110439862A (en) * | 2018-05-04 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN110439860A (en) * | 2018-05-04 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN110439861A (en) * | 2018-05-04 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN111271301B (en) * | 2020-02-27 | 2021-05-18 | 宁波方太厨具有限公司 | Dynamic balance correction method for impeller of centrifugal fan of range hood |
| WO2021238186A1 (en) * | 2020-05-27 | 2021-12-02 | 佛山市顺德区美的洗涤电器制造有限公司 | Cooking oil fume suction apparatus, combined cooking device, control method and apparatus, and storage medium |
| CN112145453B (en) * | 2020-09-25 | 2022-08-26 | 佛山市顺德区美的洗涤电器制造有限公司 | Centrifugal fan, shell structure thereof and range hood |
| CN113483429B (en) * | 2021-09-03 | 2021-11-19 | 海门金佰恒不锈钢制品有限公司 | Kitchen ventilation unit easy to assemble |
| CN114738835B (en) * | 2022-04-20 | 2024-02-27 | 珠海格力电器股份有限公司 | Fresh air device, air conditioner and fresh air control method |
| CN115559929A (en) * | 2022-11-29 | 2023-01-03 | 江西昊仁电力设备有限公司 | Air volume and air pressure adjusting device and method based on ventilator |
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| JP3125464B2 (en) * | 1992-09-21 | 2001-01-15 | 松下電器産業株式会社 | Fan lock detection device for built-in cooking equipment |
| CN102734866A (en) * | 2011-04-13 | 2012-10-17 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and operation control method thereof |
| US9528710B2 (en) * | 2014-03-12 | 2016-12-27 | Haier U.S. Appliance Solutions, Inc. | Sensing system for a cooktop appliance with airflow protected sensor |
| CN203730405U (en) * | 2014-03-21 | 2014-07-23 | 珠海格力电器股份有限公司 | Fan and volute and impeller assembly thereof |
| CN104005996A (en) * | 2014-05-13 | 2014-08-27 | 珠海格力电器股份有限公司 | Volute, centrifugal fan volute and range hood |
| CN204511988U (en) * | 2015-02-12 | 2015-07-29 | 宁波方太厨具有限公司 | A kind of centrifugal blower of snail tongue dynamic adjustment |
| CN206000764U (en) * | 2016-08-19 | 2017-03-08 | 宁波方太厨具有限公司 | A kind of centrifugal blower |
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