CN112081769A - Axial flow fan or fan with automatic head shaking mechanism - Google Patents

Axial flow fan or fan with automatic head shaking mechanism Download PDF

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Publication number
CN112081769A
CN112081769A CN202011072076.7A CN202011072076A CN112081769A CN 112081769 A CN112081769 A CN 112081769A CN 202011072076 A CN202011072076 A CN 202011072076A CN 112081769 A CN112081769 A CN 112081769A
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CN
China
Prior art keywords
fan
sectional type
fixedly connected
clamping
connecting piece
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Pending
Application number
CN202011072076.7A
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Chinese (zh)
Inventor
麦鸿杰
孙峰
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Foshan Saida Ventilator Co ltd
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Foshan Saida Ventilator Co ltd
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 Foshan Saida Ventilator Co ltd filed Critical Foshan Saida Ventilator Co ltd
Priority to CN202011072076.7A priority Critical patent/CN112081769A/en
Publication of CN112081769A publication Critical patent/CN112081769A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/08Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/10Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air
    • F04D25/105Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provisions for automatically changing direction of output air by changing rotor axis direction, e.g. oscillating fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/60Mounting; Assembling; Disassembling
    • F04D29/64Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646Mounting or removal of fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to the technical field of axial fans (fans), and discloses an axial fan or a fan with an automatic head shaking mechanism. This take axial fan or fan of automatic mechanism of shaking head, through the sectional type dryer that is assembled by sectional type dryer unit and connecting piece, the air current of being convenient for can not be rotatory at the dryer internal length distance, avoid producing strong air current noise and vibration, simultaneously when the mounted position is restricted, the clearance between the dryer unit of accessible disconnection formula supplyes the air inlet, through being provided with the spout on the connecting piece, be provided with the slider with spout looks adaptation on the sectional type dryer unit, the sectional type dryer unit of being convenient for slips into between four connecting pieces through slider and spout fast.

Description

Axial flow fan or fan with automatic head shaking mechanism
Technical Field
The invention relates to the technical field of axial flow fans (fans), in particular to an axial flow fan or a fan with an automatic oscillating mechanism.
Background
The axial flow fan is widely used for ventilation of factories, mines, tunnels, cooling towers, vehicles and ships, can also be used for ventilation or enhanced heat dissipation in places such as metallurgy, chemical engineering, light industry, food, medical equipment, mechanical equipment, civil buildings and the like, and can also be used as a free fan.
The existing axial flow fan generally arranges an impeller in a cylindrical air duct, and because the air flow strongly rotates in the air duct, when the axial flow fan is used as a free fan, great air flow noise and vibration can be generated, meanwhile, the blown air flow is scattered quickly due to no restriction of the pipeline, the phenomenon that the air speed is severely reduced at a short distance and a long distance is shown, the ventilation and cooling requirements of users cannot be met, in addition, for some special conditions needing to be mounted close to a wall, the air cylinder of a general axial flow fan cannot obtain enough air suction area and also can cause that the air quantity cannot reach the required working condition, meanwhile, the structure is fixed, quick disassembly and maintenance are not convenient, the use direction of the existing axial flow fan is not convenient to adjust, and the existing axial flow fan has certain limitation, so that the axial flow fan or the fan with the automatic head shaking mechanism is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an axial flow fan or a fan with an automatic oscillating mechanism, which has the advantages of low noise, low vibration, large air quantity, long range, convenience in maintenance, automatic oscillation and the like, and solves the problems that the conventional axial flow fan has high noise, large vibration, close range, inconvenience in maintenance and insufficient air quantity when the mounting position is limited, and the conventional axial flow fan has certain limitation due to the fact that the use direction of the conventional axial flow fan is inconvenient to adjust.
(II) technical scheme
In order to achieve the purposes of small noise, small vibration, large air quantity, long range and convenient maintenance, the invention provides the following technical scheme: an axial flow fan or fan with an automatic head shaking mechanism comprises a base, three sectional type air duct units and four connecting pieces, wherein the four connecting pieces are symmetrically distributed outside the sectional type air duct units in pairs, a guide vane is fixedly connected to the right side of the sectional type air duct unit on the right side, a sliding groove is formed in one side, close to the sectional type air duct units, of the connecting pieces, ten clamping holes are formed in the connecting pieces, an installation piece is fixedly connected to one side, close to the sectional type air duct units, of the connecting piece, one end, far away from the connecting piece, of the installation piece is fixedly connected with a fan main body, fan blades are fixedly connected to an output shaft of the fan main body, two sliding blocks are fixedly connected to the top and the bottom of the sectional type air duct unit, a through hole is formed in one side, close to the connecting piece, of each sliding, the inner walls of the left side and the right side of the sliding block are both provided with a limiting groove, the inside of the telescopic cavity is movably provided with a telescopic spring, one end of the expansion spring close to the through hole is fixedly connected with a clamping column, the left side and the right side of the clamping column are both fixedly connected with limiting blocks, a fixing nut is sleeved outside the clamping column, a rotating motor is fixed on the inner wall of the back of the base, the output shaft of the rotating motor is fixedly connected with a transmission gear positioned in the base, the inner walls of the front surface and the back surface of the base are both fixedly provided with rotating bearings, the rotating bearings on the back surface are internally and movably provided with rotating rods, a driven gear is fixedly arranged outside the rotating rod, the front surface of the rotating rod is fixedly connected with a rotating platform positioned in the rotating bearing at the front surface, the front fixedly connected with quantity of revolving stage is four and two for the group respectively with two connecting piece fixed connection's bracing piece.
Preferably, the segmented air duct unit is arc-shaped, conical or other shapes, and the side surface of the segmented air duct unit is an arc edge.
Preferably, the stator is flat, convex or wing type, and the stator can be integrated into one piece's dull and stereotyped structure, stator clockwise's inside and outside corner is fan-shaped limit, and outside stator terminal surface is the elliptical edge, and stator counter-clockwise's corner is the corner cut limit.
Preferably, the clamping hole and the sliding groove are arranged on the same horizontal line, and the clamping hole is connected with the sliding groove in a penetrating mode.
Preferably, the sliding block is matched with the sliding groove, and the sliding block is movably connected inside the sliding groove.
Preferably, the diameter of the through hole is larger than that of the clamping column, and the clamping column extends to the outside of the telescopic cavity through the through hole.
Preferably, the diameter of the clamping hole is larger than that of the clamping column, and the clamping column penetrates through the clamping hole and extends to the outside of the connecting piece.
Preferably, the limiting block is matched with the limiting groove, and the limiting block is movably connected inside the limiting groove.
Preferably, the outer wall of the clamping column is provided with a thread groove matched with the fixing nut, and the clamping column is in threaded connection with the fixing nut through the thread groove.
(III) advantageous effects
Compared with the prior art, the invention provides an axial flow fan or fan with an automatic head shaking mechanism, which has the following beneficial effects:
the axial flow fan or fan with the automatic head shaking mechanism is characterized in that the sectional type air cylinder assembled by the sectional type air cylinder unit and the connecting pieces is used for facilitating air flow not to rotate in the air cylinder for a long distance, avoiding strong air flow noise and vibration, simultaneously when the installation position is limited, air can be supplemented through the gap between the disconnected air cylinder units, the connecting pieces are provided with the chutes, the sectional type air cylinder unit is provided with the slide blocks matched with the chutes, the sectional type air cylinder unit is convenient to slide into the four connecting pieces through the slide blocks and the chutes quickly, the slide blocks are internally provided with the through holes, the telescopic cavities, the limiting grooves, the telescopic springs, the clamping columns and the limiting blocks, the connecting pieces are provided with ten clamping holes, the clamping columns can move up and down in the telescopic cavities through the elasticity of the telescopic springs conveniently, and the limiting blocks and the limiting grooves enable the movement to be more stable, thereby be convenient for the card post to insert the inside in card hole fast, install fixedly to sectional type dryer unit, simultaneously can remove fixedly fast through pressing the card post, remove or demolish sectional type dryer unit, thereby can adjust the interval between every sectional type dryer unit more with the demand, adjust its shock attenuation and the performance of making an uproar of falling according to the size of wind-force, can clear up the maintenance with taking off it fast simultaneously, also can adjust the quantity of sectional type dryer unit according to the demand, there is fixing nut through the outside threaded connection of card post, be convenient for fix the card post through fixing nut, prevent it and become flexible in the use, be provided with the stator through left side sectional type dryer unit, the static pressure efficiency of the fan of being convenient for is showing and improves, the power of exerting oneself of fan can be brought into full play, and the operation of fan has been improved, be provided with rotating electrical machines through the inside of base, Drive gear, swivel bearing, the rotary rod, driven gear and revolving stage, it is rotatory that driven gear passes through drive gear's rotation and be convenient for, thereby it rotates in two swivel bearing's inside respectively to drive rotary rod and revolving stage, be provided with the bracing piece through on the revolving stage, and bracing piece and connecting piece fixed connection, the revolving stage of being convenient for drives whole device through the bracing piece and rotates, thereby adjust its direction of use, small in noise has been reached, the vibration is little, the amount of wind is big, the range is far away, be convenient for maintain and the automatic purpose of shaking the head.
Drawings
FIG. 1 is a sectional view of an axial flow fan or fan with an automatic oscillating mechanism according to the present invention;
FIG. 2 is an enlarged view of the structure A in FIG. 1 of an axial flow fan or fan with an automatic oscillating mechanism according to the present invention;
FIG. 3 is a front view of an axial flow fan or fan with an automatic oscillating mechanism according to the present invention;
fig. 4 is a structural diagram of a guide vane of an axial flow fan or a fan with an automatic oscillating mechanism according to the present invention.
In the figure: the fan comprises a sectional type air duct unit 1, a connecting piece 2, a guide vane 3, a cambered edge 4, a corner cutting edge 5, an elliptical edge 6, a fan-shaped edge 7, a sliding groove 8, a clamping hole 9, a mounting piece 10, a fan body 11, fan blades 12, a sliding block 13, a through hole 14, a telescopic cavity 15, a limiting groove 16, a telescopic spring 17, a clamping column 18, a limiting block 19, a fixing nut 20, a base 21, a rotary motor 22, a transmission gear 23, a rotary bearing 24, a rotary rod 25, a driven gear 26, a rotary table 27 and a support rod 28.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, an axial flow fan or fan with an automatic oscillating mechanism includes a base 21, three sectional type air duct units 1 and four connecting pieces 2, wherein the sectional type air duct units 1 are arc-shaped, conical-shaped or other shapes, the side surfaces of the sectional type air duct units 1 are arc edges 4, the four connecting pieces 2 are symmetrically distributed outside the sectional type air duct units 1 two by two, a guide vane 3 is fixedly connected to the right side of the right sectional type air duct unit 1, the guide vane 3 is flat, circular or wing-shaped, and the guide vane 3 can be an integrally formed flat plate structure, the inner and outer sides of the guide vane 3 in the clockwise direction are both fan edges 7, the end surface of the outer guide vane 3 is an elliptical edge 6, the corner of the guide vane 3 in the counterclockwise direction is a corner edge 5, a chute 8 is disposed on one side of the connecting piece 2 close to the sectional type air duct unit 1, ten clamping holes 9 are disposed inside the connecting piece 2, the clamping hole 9 and the sliding groove 8 are arranged on the same horizontal line, the clamping hole 9 is connected with the sliding groove 8 in a penetrating way, one side of the connecting piece 2 close to the sectional type air duct unit 1 is fixedly connected with an installation piece 10, one end of the installation piece 10 far away from the connecting piece 2 is fixedly connected with a fan main body 11, an output shaft of the fan main body 11 is fixedly connected with fan blades 12, the top and the bottom of the sectional type air duct unit 1 are fixedly connected with two sliding blocks 13, the sliding blocks 13 are matched with the sliding groove 8, the sliding groove 8 is movably connected with the sliding blocks 13, one side of the sliding blocks 13 close to the connecting piece 2 is provided with a through hole 14, a telescopic cavity 15 is arranged inside the sliding blocks 13, the inner walls of the left side and the right side of the sliding blocks 13 are provided with limiting grooves 16, a telescopic spring 17 is movably arranged inside the telescopic cavity 15, one end, the clamp column 18 extends to the outside of the telescopic cavity 15 through the through hole 14, the diameter of the clamp hole 9 is larger than that of the clamp column 18, the clamp column 18 penetrates through the clamp hole 9 and extends to the outside of the connecting piece 2, the left side and the right side of the clamp column 18 are both fixedly connected with limit blocks 19, the limit blocks 19 are matched with limit grooves 16, the inside of the limit grooves 16 is movably connected with the limit blocks 19, the outside of the clamp column 18 is sleeved with a fixing nut 20, the outer wall of the clamp column 18 is provided with a thread groove matched with the fixing nut 20, the clamp column 18 is in threaded connection with the fixing nut 20 through the thread groove, the back inner wall of the base 21 is fixed with a rotating motor 22, an output shaft of the rotating motor 22 is fixedly connected with a transmission gear 23 positioned inside the base 21, the front side and the back inner wall of the base 21 are both fixedly provided with a rotating bearing 24, the inside of the back rotating bearing, the front surface of the rotating rod 25 is fixedly connected with a rotating platform 27 positioned inside the front surface rotating bearing 24, and the front surface of the rotating platform 27 is fixedly connected with four supporting rods 28, wherein the two supporting rods are respectively fixedly connected with the two connecting pieces 2.
To sum up, the axial flow fan or fan with the automatic oscillating mechanism is convenient for air flow not to rotate in the wind tube at a long distance through the sectional wind tube assembled by the sectional wind tube unit 1 and the connecting piece 2, avoids generating strong air flow noise and vibration, can supplement air inlet through the gap between the disconnected wind tube units when the installation position is limited, is convenient for the sectional wind tube unit 1 to rapidly slide into the four connecting pieces 2 through the sliding block 13 and the sliding groove 8 by arranging the sliding groove 8 on the connecting piece 2 and arranging the through hole 14, the telescopic cavity 15, the limiting groove 16, the telescopic spring 17, the clamping column 18 and the limiting block 19 in the connecting piece 2, is provided with ten clamping holes 9 on the connecting piece 2, and is convenient for the clamping column 18 to move up and down in the telescopic cavity 15 through the elasticity of the telescopic spring 17, the limiting blocks 19 and the limiting grooves 16 enable the movement of the segmented air duct units to be more stable, so that the clamping columns 18 can be conveniently and quickly inserted into the clamping holes 9, the segmented air duct units 1 can be installed and fixed, meanwhile, the fixation can be quickly released by pressing the clamping columns 18, the segmented air duct units 1 can be moved or dismantled, the distance between every two segmented air duct units 1 can be adjusted according to the use requirements, the damping and noise reduction performance of the segmented air duct units 1 can be adjusted according to the size of wind power, meanwhile, the segmented air duct units 1 can be quickly taken down for cleaning and maintenance, the number of the segmented air duct units 1 can be adjusted according to the requirements, fixing nuts 20 are connected through external threads of the clamping columns 18, the clamping columns 18 can be conveniently fixed through the fixing nuts 20, the loosening of the clamping columns 18 in the use process is prevented, guide vanes 3 are arranged on the left segmented air duct units 1, and, the output of the fan can be fully exerted, the running performance of the fan is improved, the rotating motor 22, the transmission gear 23, the rotating bearing 24, the rotating rod 25, the driven gear 26 and the rotating platform 27 are arranged in the base 21, the driven gear 26 can rotate through the rotation of the transmission gear 23, the rotating rod 25 and the rotating platform 27 are driven to rotate in the two rotating bearings 24 respectively, the supporting rod 28 is arranged on the rotating platform 27 and fixedly connected with the connecting piece 2, the rotating platform 27 can drive the whole device to rotate through the supporting rod 28, the using direction of the device can be adjusted, the purposes of low noise, low vibration, high air quantity, long range and convenient maintenance and automatic shaking are achieved, the problems that when the traditional axial flow fan is used as a free fan, the noise is high, the vibration is high, the range is short and the installation position is limited are solved, not convenient for maintain, the not enough condition of expression air output, current axial fan is not convenient for adjust its direction of use simultaneously, makes its problem that has certain limitation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides an axial fan or fan of mechanism is shaken head automatically in area, includes that base (21), quantity are three sectional type dryer unit (1) and quantity are connecting piece (2) of four, its characterized in that: four connecting pieces (2) are symmetrically distributed outside the sectional type air duct unit (1) in pairs, the right side of the sectional type air duct unit (1) is fixedly connected with guide vanes (3), one side, close to the sectional type air duct unit (1), of each connecting piece (2) is provided with a sliding groove (8), ten clamping holes (9) are formed in each connecting piece (2), one side, close to the sectional type air duct unit (1), of each connecting piece (2) is fixedly connected with an installation piece (10), one end, far away from the connecting pieces (2), of each installation piece (10) is fixedly connected with a fan main body (11), fan blades (12) are fixedly connected onto an output shaft of each fan main body (11), the tops and the bottoms of the sectional type air duct units (1) are fixedly connected with two sliding blocks (13), and one sides, close to the connecting pieces (2), of the sliding blocks (13) are provided with through holes (, the telescopic cavity (15) is formed in the sliding block (13), the inner walls of the left side and the right side of the sliding block (13) are respectively provided with a limiting groove (16), the telescopic cavity (15) is movably provided with a telescopic spring (17), one end of the telescopic spring (17) close to the through hole (14) is fixedly connected with a clamping column (18), the left side and the right side of the clamping column (18) are respectively fixedly connected with a limiting block (19), the outer part of the clamping column (18) is sleeved with a fixing nut (20), the inner wall of the back side of the base (21) is fixedly provided with a rotating motor (22), an output shaft of the rotating motor (22) is fixedly connected with a transmission gear (23) positioned in the base (21), the front side and the inner wall of the back side of the base (21) are respectively and fixedly provided with a rotating bearing (24), and the back side of the, the outside fixed mounting of rotary rod (25) has driven gear (26), the positive fixedly connected with of rotary rod (25) is located openly revolving stage (27) inside swivel bearing (24), the positive fixedly connected with quantity of revolving stage (27) be four and two for the group respectively with two connecting piece (2) fixed connection's bracing piece (28).
2. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the sectional type wind tube unit (1) is arc-shaped, conical or other shapes, and the side surface of the sectional type wind tube unit (1) is an arc edge (4).
3. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the utility model discloses a fan-shaped structure of stator.
4. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the clamping holes (9) and the sliding grooves (8) are arranged on the same horizontal line, and the clamping holes (9) are in penetrating connection with the sliding grooves (8).
5. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the slider (13) is matched with the sliding groove (8), and the slider (13) is movably connected inside the sliding groove (8).
6. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the diameter of the through hole (14) is larger than that of the clamping column (18), and the clamping column (18) extends to the outside of the telescopic cavity (15) through the through hole (14).
7. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the diameter of the clamping hole (9) is larger than that of the clamping column (18), and the clamping column (18) penetrates through the clamping hole (9) and extends to the outside of the connecting piece (2).
8. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the limiting block (19) is matched with the limiting groove (16), and the limiting block (19) is movably connected inside the limiting groove (16).
9. An axial fan or fan with an automatic head shaking mechanism according to claim 1, characterized in that: the outer wall of the clamping column (18) is provided with a thread groove matched with the fixing nut (20), and the clamping column (18) is in threaded connection with the fixing nut (20) through the thread groove.
CN202011072076.7A 2020-10-09 2020-10-09 Axial flow fan or fan with automatic head shaking mechanism Pending CN112081769A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011072076.7A CN112081769A (en) 2020-10-09 2020-10-09 Axial flow fan or fan with automatic head shaking mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011072076.7A CN112081769A (en) 2020-10-09 2020-10-09 Axial flow fan or fan with automatic head shaking mechanism

Publications (1)

Publication Number Publication Date
CN112081769A true CN112081769A (en) 2020-12-15

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Application Number Title Priority Date Filing Date
CN202011072076.7A Pending CN112081769A (en) 2020-10-09 2020-10-09 Axial flow fan or fan with automatic head shaking mechanism

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112664469A (en) * 2020-12-23 2021-04-16 浙江龙信风机有限公司 Centrifugal axial flow fan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112664469A (en) * 2020-12-23 2021-04-16 浙江龙信风机有限公司 Centrifugal axial flow fan

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