CN108661946B - Fan with fan body - Google Patents

Fan with fan body Download PDF

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Publication number
CN108661946B
CN108661946B CN201810749396.8A CN201810749396A CN108661946B CN 108661946 B CN108661946 B CN 108661946B CN 201810749396 A CN201810749396 A CN 201810749396A CN 108661946 B CN108661946 B CN 108661946B
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CN
China
Prior art keywords
blade
fan
fan blade
shaft
rotating shaft
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.)
Active
Application number
CN201810749396.8A
Other languages
Chinese (zh)
Other versions
CN108661946A (en
Inventor
张焕明
崔世强
郭润明
张旭升
易榕
方与
康瑞祥
梁丽
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.)
Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Environment Appliances Manufacturing 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 Midea Group Co Ltd, GD Midea Environment Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201810749396.8A priority Critical patent/CN108661946B/en
Publication of CN108661946A publication Critical patent/CN108661946A/en
Application granted granted Critical
Publication of CN108661946B publication Critical patent/CN108661946B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
    • 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
    • F04D19/007—Axial-flow pumps multistage 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
    • F04D29/327—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with non identical blades
    • 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
    • F04D29/386—Skewed blades
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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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 discloses a fan, which comprises a fan blade, a driving device and a bracket, wherein the fan blade is provided with a fan blade, the fan blade comprises a first fan blade and a second fan blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is positioned at the rear end of the second fan blade, and the first fan blade guides external airflow into the bracket; the chord length of the root of the first fan blade is L1, the axial distance between the first fan blade and the second fan blade is L2, and L1/L2 epsilon [0.1,1]; the fan blade is arranged on the driving device, and the driving device is used for providing power for the rotation of the fan blade; the driving device is arranged on the bracket. The technical scheme of the invention is that: when the axial distance between the first fan blade and the second fan blade is L2, L1/L2 epsilon [0.1,1], the noise effect is lower.

Description

Fan with fan body
Technical Field
The invention relates to the technical field of fans, in particular to a fan.
Background
The existing fan adopts double-blade equidirectional air supply, and compared with a single-blade fan, the air supply distance is more concentrated. The fan is provided with a first fan blade and a second fan blade, and the first fan blade and the second fan blade are arranged on the motor. However, when the first fan blade guides the outside air into the fan, the blades of the second fan blade can generate resistance to the air flow to generate noise. The first fan blade and the second fan blade can generate vortex to generate noise, and the larger the axial distance between the first fan blade and the second fan blade is, the larger the generated noise is. In addition, the two fan blades are easy to generate resonance to generate noise.
Disclosure of Invention
The invention mainly aims to provide a fan and aims to solve the problem of loud fan noise.
In order to achieve the above object, the present invention provides a fan, comprising:
the fan blade comprises a first fan blade and a second fan blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is positioned at the front end of the second fan blade,
the chord length of the root of the first fan blade is L1, the axial distance between the first fan blade and the second fan blade is L2, and L1/L2 epsilon [0.1,1];
the driving device is arranged on the fan blade and is used for providing power for the rotation of the fan blade;
and the driving device is arranged on the bracket.
Preferably, the chord length of the blade root of the first blade is L1, and the axial distance between the first blade and the second blade is L2, L1/L2 epsilon [0.4,0.8].
Preferably, the number of the blades of the first fan blade and the second fan blade is prime.
Preferably, the diameter of the second fan blade is larger than that of the first fan blade.
Preferably, the fan further comprises a mounting seat, a rotating shaft is arranged between the bracket and the mounting seat, and the bracket can be vertically overturned through the rotating shaft and is mounted on the mounting seat.
Preferably, the rotating shaft comprises a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are respectively and fixedly installed at the left end and the right end of the bracket, and a first shaft sleeve and a second shaft sleeve for the rotation of the first rotating shaft and the second rotating shaft are correspondingly arranged on the mounting seat.
Preferably, the periphery of first pivot and/or the second pivot is provided with and is equipped with the card and holds the device, the card hold the device including the sleeve with install in elastic component and bulb pole in the sleeve, telescopic one end with support fixed connection, the one end of elastic component with support butt or fixed, the other end of elastic component with bulb pole butt or fixed, be provided with on first axle sleeve or the second axle sleeve and supply the draw-in groove that the bulb pole stretches into, the draw-in groove is followed first axle sleeve or second axle sleeve circumference distributes.
Preferably, the bracket is provided with a first limiting seat and a second limiting seat, the first limiting seat is arranged on the periphery of the first rotating shaft in a ring mode, and the second limiting seat is arranged on the periphery of the second rotating shaft in a ring mode.
Preferably, a convex ring is arranged at the free end of the first rotating shaft, and the convex ring is abutted with the end face of the first shaft sleeve, which is far away from one end of the bracket; and/or the free end of the second rotating shaft is provided with a second convex ring, and the second convex ring is abutted with the end face of the second sleeve, which is far away from one end of the bracket.
Preferably, one end of the first limiting seat, which is away from the bracket, protrudes outwards along the radial direction of the first limiting seat to form a clamping protrusion, and a flange for blocking the rotation of the clamping protrusion is arranged on the mounting seat.
Preferably, at least one of the first rotating shaft and the second rotating shaft is hollow and cylindrical.
Preferably, the driving device is provided with an output shaft, the first fan blade and the second fan blade are mounted on the output shaft, and the fan further comprises a third fan blade, and the third fan blade is mounted on the output shaft.
Preferably, the third fan blade is arranged at the outer side of the first fan blade, and the length of the third fan blade is smaller than that of the first fan blade.
Preferably, the fan further comprises a fourth fan blade, and the fourth fan blade is mounted on the output shaft.
Preferably, the fourth fan blade is disposed between the first fan blade and the second fan blade, and the length of the fourth fan blade is smaller than that of the second fan blade.
The technical scheme of the invention is that: when the axial distance between the first fan blade and the second fan blade is L2, L1/L2 epsilon [0.1,1], the noise effect is lower.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a fan according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a fan according to the present invention;
FIG. 3 is a schematic diagram of a split structure of the fan of FIG. 1;
FIG. 4 is a schematic structural view of the first fan blade in FIG. 3;
FIG. 5 is a schematic view of the first shaft, the first sleeve and the retaining device in FIG. 3;
FIG. 6 is a schematic view illustrating another direction of the first shaft, the first sleeve and the retaining device in FIG. 5;
FIG. 7 is a schematic structural view of the second shaft and the second sleeve in FIG. 3;
FIG. 8 is a schematic view of the left end of the front mounting base of FIG. 3;
FIG. 9 is a schematic view of the right end of the front mounting base of FIG. 3;
fig. 10 is a schematic structural diagram of a motor and blades of another embodiment of the fan of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a fan.
Referring to fig. 1 to 4, a fan 100 provided by the present invention includes a fan blade 30, a driving device 20 and a bracket 10; the fan blades 30 comprise a first fan blade 31 and a second fan blade 32, the first fan blade 31 and the second fan blade 32 are coaxially arranged, the first fan blade 31 is positioned at the front end of the second fan blade 32, and the first fan blade 31 guides external air flow into the bracket 10; the chord length of the blade root of the first blade 31 is L1, and the axial distance between the first blade 31 and the second blade 32 is L2, L1/L2 e [0.1,1]; the fan blade 30 is mounted on the driving device 20, and the driving device 20 is used for providing power for rotation of the fan blade 30; the driving device 20 is mounted on the stand 10.
Specifically, referring to fig. 1 to 3, the bracket 10 is generally circular and extends through the front and rear, although the bracket 10 may be other shapes, such as square, polygonal, etc. The driving device 20 is fixedly installed at the center of the bracket 10, and various fixing modes, such as clamping connection, screw connection and the like, and the two side surfaces of the bracket 10 are provided with the mesh enclosure 40, and the mesh enclosure 40 is detachably connected with the bracket 10. The driving device 20 may be a single motor or a double motor, when the single motor is adopted, two end portions of the output shaft 21 of the single motor protrude out of the end faces of the motor, and the first fan blade 31 and the second fan blade 32 are installed at two ends of the output shaft 21, and at this time, the inclination directions of the fan blades are the same, so that the same-side air outlet is ensured. The inclination angles of the first fan blade 31 and the second fan blade 32 may be the same or different, and the number of the first fan blade 31 and the number of the second fan blade 32 may be the same or different, and are set as required. When a dual motor (not shown) is employed, the first and second blades 31 and 32 are mounted on the output shafts 21 of the first and second motors, respectively, and the first and second blades 31 and 32 are mounted coaxially. At this time, the angles and the directions of inclination of the first fan blade 31 and the second fan blade 32 may be the same or different, and the number of the first fan blade 31 and the number of the second fan blade 32 may be the same or different. The first motor and the second motor can be controlled by separate circuit boards or can be controlled by different circuit boards.
The first fan 31 mainly guides the outside air into the bracket 10, and the longer the root of the first fan 31, the greater the resistance to the air flow and the greater the noise. If the root of the first fan blade 31 is short, the airflow will form a serious vortex when flowing from the periphery of the hub of the first fan blade 31 to the front of the first fan blade 31, and the noise will be loud. In addition, if the axial distance between the first fan blade 31 and the second fan blade 32 is larger, the eddy is more serious, the noise is larger, and if the axial distance between the first fan blade 31 and the second fan blade 32 is smaller, the air output is smaller.
In view of this, in order to verify the relationship between the chord length L1 of the root of the first blade 31 and the axial distance L2 between the first blade 31 and the second blade 32, the following experiment is performed:
table 1, values of L1/L2 correspond to respective noise values
As can be seen from Table 1, when L1/L2 is in the range of [0.1,1], the overall noise is approximately between 44.9 and 60.1dB, which is relatively small. If L1/L2 is greater than 5, for example l1/l2=6.5, the noise will increase to 5.4dB. In addition, when L1/L2 is between [0.1,1.5], the noise value is minimized.
Table 2, each air volume value corresponding to the value of L1/L2
As can be seen from Table 2, when L1/L2 is between [0.1,1.0], the air output is maximum, and the noise is low.
By combining tables 1 and 2, it can be seen that when L1/L2 is between [0.4,0.8], both noise and air output are at a preferred level.
According to the invention, the second fan blade 32 is arranged in the axial direction of the first fan blade 31, the first fan blade 31 draws air from the outside, and the second fan blade 32 accelerates the air drawn by the first fan blade 31, so that the distance of blowing by the fan is longer. Experiments prove that when the chord length L1 of the root of the first fan blade 31 is equal to the axial distance L2 between the first fan blade and the second fan blade, L1/L2 epsilon [0.1,1], the noise is smaller;
referring to fig. 3 and 4, when the first fan blade 31 and the second fan blade 32 rotate, resonance occurs between the blades, and therefore, the number of the blades is an odd number. On the one hand, since odd blade combinations can bring more performance advantages than even blade combinations. If the number of the blades is even, and a symmetrical arrangement is formed, not only is the balance of the blades difficult to adjust, but also more resonance noise is generated by the blades. Thus, in the present embodiment, the number of blades is an odd number, for example: 3, 5, 7, 9 or more. On the other hand, it is considered that even if the number of the odd-numbered blades is an odd number, for example, 9, that is, three blades are grouped together, and three groups of blades are resonated to generate noise. Therefore, in this embodiment, further, the number of the blades is odd, for example, 3, 5, 7, 11, 13, etc., so that resonance between the blades can be greatly reduced, and noise is lower.
Referring to fig. 1 to 3, since the first fan blade 31 mainly serves to suck the external air flow into the cabinet, the second fan blade 32 mainly serves to control the air supply distance (to blow the air flow farther or closer). In addition, after the first fan blade 31 directs the air flow to the front thereof, the area occupied by the air flow is larger than the area of the air outlet surface of the first fan blade 31 (the area is equal to the radius R of the first fan blade 31 1 Calculating the area S of the air outlet surface 1 ＝πR 1 2 ) Therefore, part of the airflow is easy to scatter to the periphery of the second fan blade 32, so that the air output is low. In view of this, in another preferred embodiment, the diameter of the second fan blade 32 is greater than or equal to the diameter of the first fan blade 31. In this way, the second fan blade 32 has a covering effect on the air outlet face of the first fan blade 31 in the axial direction, and when the second fan blade 32 operates, more air flows in front of the first fan blade 31 can be led outThe loss of air flow is reduced.
Considering that the heights of users are different, when the fan is used, users often need to pad things to reach the required blowing angle, so that the experience effect of the users is poor. For this purpose, referring to fig. 3, 5, 6 and 7, the fan 100 further includes a mounting base 50, a rotating shaft is disposed between the bracket 10 and the mounting base 50, and the bracket 10 is mounted on the mounting base 50 in a manner that the bracket can be turned upside down through the rotating shaft. The mounting seat 50 is provided with a semicircular notch 53 for accommodating the circular bracket 10, the mounting seat 50 is a hollow shell, the mounting seat 50 comprises a front mounting seat 52 and a rear mounting seat 52, the front mounting seat 52 and the rear mounting seat 52 are fixed together through screws, and of course, other modes of fixing, such as clamping, and the like, are also possible. The user can turn over the adjusting bracket 10 up and down according to the own needs to reach the own required blowing angle.
Further, the rotating shafts include a first rotating shaft 11 and a second rotating shaft 16, the first rotating shaft 11 and the second rotating shaft 16 are respectively and fixedly installed at the left end and the right end of the bracket 10, and the mounting seat 50 is correspondingly provided with a first shaft sleeve 12 and a second shaft sleeve 17 for rotating the first rotating shaft 11 and the second rotating shaft 16. Mounting holes 522 into which the first rotating shaft 11 and the second rotating shaft 16 extend are formed in the left end and the right end of the mounting seat 50, and the first shaft sleeve 12 and the second shaft sleeve 17 are mounted at the left end and the right end of the mounting seat 50. The first shaft sleeve 12 and the second shaft sleeve 17 are provided with lugs 122, the mounting seat 50 is provided with studs 521 for fixedly mounting the first shaft sleeve 12 and the second shaft sleeve 17, and the first shaft sleeve 12 and the second shaft sleeve 17 are fixed on the mounting seat 50 through the lugs 122 and the studs 521. Of course, there are various ways of fixing the first sleeve 12 and the second sleeve 17 to the mounting base 50, such as clamping, integrally forming, etc. It is easy to think that the first rotating shaft 11 and the second rotating shaft 16 may be fixedly installed at the left and right ends of the installation seat 50, and the bracket 10 is correspondingly provided with a first shaft sleeve 12 and a second shaft sleeve 17 for rotating the first rotating shaft 11 and the second rotating shaft 16, so that similar effects can be achieved. The first rotating shaft 11 and the second rotating shaft 16 are fixed on the bracket 10 in various manners, such as screw fixation, clamping, integral molding, and the like. In addition, it is considered that the rotation shaft and the shaft sleeve may be worn out when the fan 100 is used for a long period of time, which affects the service life of the fan 100. Therefore, the first shaft 11, the second shaft 16, the first sleeve 12 and the second sleeve 17 are made of wear-resistant materials, such as POM, POK, etc., and the first shaft 11 and the second shaft 16 are detachably connected to the bracket 10, and the first sleeve 12 and the second sleeve 17 are detachably connected to the mounting base 50, so as to facilitate replacement.
When the bracket 10 is mounted on the mounting seat 50 through the first rotating shaft 11 and the second rotating shaft 16, the bracket can slide left and right, so that the use of a user is influenced, and on the other hand, the bracket is not strictly matched at the connecting place of the first rotating shaft 11 and the second rotating shaft 16, so that the appearance of a product is influenced. For the above-mentioned situation, the bracket 10 is provided with a first limiting seat 13 and a second limiting seat 18, the first limiting seat 13 is annularly disposed on the outer circumferences of the first rotating shaft 11 and the clamping device 14, and the second limiting seat 18 is annularly disposed on the outer circumference of the second rotating shaft 16. The free end surface of the first limiting seat 13 is abutted with the first shaft sleeve 12, and the free end surface of the second limiting seat 18 is abutted with the second shaft sleeve 17. The first limiting seat 13 and the second limiting seat 18 are arranged in a circular ring shape and are integrally formed with the bracket 10. Of course, the first limiting seat 13 and the second limiting seat 18 may be ring-shaped with other shapes, such as square, polygon, etc., and the first limiting seat 13 and the second limiting seat 18 may be replaced by other manners, so as to achieve the effect of limiting the left-right sliding of the bracket 10, such as protrusions, posts, etc., and the first limiting seat 13 and the second limiting seat 18 may be detachably connected with the bracket 10, so as to facilitate disassembly and assembly.
On the basis of the above embodiment, in order to maintain a desired blowing angle between the stand 10 and the mount 50 for a user. The outer periphery of the first rotating shaft 11 is provided with a clamping device 14, the clamping device 14 comprises a sleeve 141, an elastic piece 142 and a ball rod 143, the elastic piece 142 and the ball rod 143 are installed in the sleeve 141, one end of the sleeve 141 is fixedly connected with the support 10, one end of the elastic piece 142 is abutted or fixed with the support 10, the other end of the elastic piece 142 is abutted or fixed with the ball rod 143, clamping grooves 121 for the ball rod 143 to extend into are formed in the first shaft sleeve 12 or the second shaft sleeve 17, and the clamping grooves 121 are uniformly distributed along the circumference of the first shaft sleeve 12 or the second shaft sleeve 17. In order to enhance the strength of the sleeve 141, the outer periphery of the sleeve 141 is fixedly connected with the outer periphery of the first rotating shaft 11 or the inner side wall of the first limiting seat 13. The number of the holding means 14 may be one or more, and is preferably two in this embodiment, and the holding means 14 are uniformly distributed along the circumferential direction of the first rotation shaft 11. The elastic member 142 may be a spring, elastic rubber, etc., and the ball rod 143 includes a ball and a connecting rod, the ball being fixed at one end of the connecting rod. The ball head part of the ball head rod protrudes out of one end of the sleeve 141 and stretches into the clamping groove 121, the connecting rod of the ball head rod stretches into the spring, and the ball head is clamped at one end of the spring. The ball rod 143 may be replaced by a ball, and a portion of the ball protrudes from one end of the sleeve 141 and protrudes into the locking groove 121, but the ball is locked in the sleeve 141. When the bracket 10 is rotated, the ball rod 143 and the clamping groove 121 of the first shaft sleeve 12 slide relatively, so that the bracket has crisp noise and good hand feeling.
The holding devices 14 may be mounted on both left and right ends of the bracket 10, or may be mounted on one end thereof. In view of the wiring required to be energized within the rack 10, the rack 10 is conveniently powered off. Referring to fig. 3, 5, 6 and 7, in this embodiment, preferably, the outer periphery of the first rotating shaft 11 at the left end of the bracket 10 is provided with a clamping device 14, and the second rotating shaft 16 at the right end of the bracket 10 is a hollow circular tube. The right-hand member of support 10 is provided with erection column 182, and erection column 182 can have one or more, and this embodiment preferably erection column 182 is along second pivot 16 evenly distributed, and the periphery of erection column 182 is provided with strengthening rib 183 and second spacing 18 fixed connection, and the periphery of second pivot 16 sets up installation cover 161, and the periphery of installation cover 161 has offered the position-avoiding groove 162 that supplies strengthening rib 183 to step down, and second pivot 16 passes through erection column 182 and installation cover 161 to be fixed at the right-hand member of support 10. The reinforcing ribs 183 enable the strength of the mounting post 182 to be enhanced, and prevent the mounting post 182 from being broken when the bracket 10 is rotated.
When a worker assembles the product, the elastic member 142 may be separated from the sleeve 141, which is inconvenient to mount the bracket 10 on the mount 50, and affects the production efficiency. For this purpose, the free end of the first shaft 11 is provided with a collar 112, the collar 112 abutting the end face of the first sleeve 12 remote from the support 10. In order to save installation space, the end face of the first sleeve 12 facing away from the carrier 10 is provided with a countersink 123 in which the collar 112 is mounted. The end face of the first rotating shaft 11, which faces away from the opposite bracket 10, is provided with a countersunk hole 113 for screw installation, and the end face of the first rotating shaft 11, which faces toward the bracket 10, is provided with a shaft hole 111. The left end of the bracket 10 is provided with a pin shaft 15, and the pin shaft 15 is provided with a screw hole. In order to prevent the first shaft 11 and the pin 15 from rotating relatively, the pin 15 is flat, and the shaft hole 111 is adapted thereto. Of course, the first rotating shaft 11 and the pin shaft 15 may be clamped by a key. When the first shaft sleeve 12 is installed, the first shaft sleeve 12 is pressed on the first installation seat 50 after the ball head rod 143 and the elastic piece 142 are installed in the sleeve 141, then the first shaft 11 is inserted into the sinking groove 123, the screw is locked, and finally the first shaft sleeve 12 is fixed on the installation seat 50 through the lug 122 of the first shaft 11. At this time, the first mounting seat 50 and the first shaft sleeve 12 directly have a certain gap, so that the rotation of the bracket 10 is facilitated.
Referring to fig. 3, 8 and 9, if the bracket 10 is rotated too much along the same direction, the line may be damaged, and even the product may be scrapped. In order to avoid this, one end of the first limiting seat 13 or the second limiting seat 18 facing away from the bracket 10 protrudes outwards to form a clamping protrusion 131, and a left end of the mounting seat 50 is provided with a flange 523 for blocking the rotation of the clamping protrusion 131. The flange 523 is disposed at a position close to the mounting hole 522, and a left end of the flange 523 is provided with a reinforcing edge 524 to prevent the flange 523 from being damaged due to excessive force when the user rotates the stand 10. The catching protrusion 131 and the catching rim 523 are hidden-mounted in the housing of the mount 50. The retaining protrusion 131 may have various shapes, such as a boss, a convex edge, etc. The retaining protrusion 131 and the blocking plate function mainly to prevent the bracket 10 from rotating more than 360 deg., and the rotation angle may be set as desired. In this embodiment, the retaining protrusion 131 preferably protrudes outward along the radial direction to form a convex edge, the outer periphery of the convex edge is adapted to the outer periphery of the first shaft sleeve 12, the convex edge occupies about one quarter of the circular arc of the first limiting seat, and the distance from the outer periphery of the retaining protrusion 131 to the axial center of the first limiting seat 13 is greater than the radius of the mounting hole 522 at the left end of the mounting seat 50. The stand 10 may be rotated downward by about 20 ° and the stand 10 may be rotated upward by about 120 ° with respect to the stand 10 facing directly rearward. Of course, in order to prevent the bracket 10 from rotating more than 360 °, there may be other ways, such as providing a protrusion on the front end surface of the bracket 10, and the protrusion is clamped on the outer periphery of the front end of the mounting seat 50, and when the bracket 10 rotates upwards, the protrusion is clamped on the rear end surface of the bracket 10. The catching projections 131 can further prevent the bracket 10 from sliding left and right in addition to restricting the bracket 10 from rotating more than 360 °. In addition, in order to make the second limiting seat 18 snap into the mounting hole 522 at the right end of the mounting seat 50, the left-right sliding of the bracket 10 is further limited, and one end of the second limiting seat 18 extending into the mounting hole 522 at the right end of the mounting seat 50 may refer to the retaining protrusion 131 on the first limiting seat 13. However, considering that the right end of the bracket 10 needs to be powered by the outgoing line, the clamping protrusion 131 may interfere with the powered line. In this embodiment, preferably, one end of the second limiting seat 18 extending into the right end mounting hole 522 of the mounting seat 50 extends radially outwards to form an annular flanging 181, and the diameter of the flanging 181 is larger than that of the right end mounting hole 522 of the mounting seat 50. In addition, in order to facilitate the installation of the limiting seat at the right end of the bracket 10 on the installation seat 50, two installation edges 525 are convexly arranged at the bottom end and the top end of the installation hole 522 at the right end of the installation seat 50, the two installation edges 525 form an installation groove, and the size of the installation groove is adapted to the size of the outward flanging 181.
The embodiment is a specific embodiment of a fan with double fan blades, and in order to further improve the air supply distance of the fan, the invention also provides another embodiment based on the double fan blades.
Referring to fig. 10, the fan of the present embodiment further includes a third fan blade 60, and the third fan blade 60 is added to perform further rectification adjustment on the basis of the dual fan blade pair wind outlet, so as to increase the distance of the farthest wind. Specifically, the third fan blade 60 is mounted on the output shaft 21; the third fan blade 60 is disposed on the other side of the first fan blade 31 opposite to the second fan blade 32, and the blade length of the third fan blade 60 is smaller than the blade length of the first fan blade 31.
The fan blades can change the flow speed and the flow direction of the air flow, the air flow can be secondarily adjusted when the two groups of fan blades are adopted, and the purpose of manually adjusting the air outlet effect is achieved by carrying out specific setting and adjustment on the two groups of fan blades. While the flow of the air flow is hindered by the surrounding air, the boundary of the air flow has larger instability. The air flow can be equivalently divided into an air flow beam central area and an air flow beam boundary area, and compared with the air flow beam central area, the air flow velocity has larger influence on the air supply distance, and the air flow beam boundary area has larger influence on the air supply angle. Therefore, the invention provides an embodiment of adding the rectifying fan blade on the basis of the double fan blades.
The third fan 60 is a rectifying fan, and the rectifying fan is mainly used for adjusting the area proportion and the flow velocity of the central area of the airflow beam, so that the longer air supply distance is obtained by adjusting the range and the proportion of the central area and the boundary area of the airflow beam under the condition of unchanged total power.
On the basis of this, in order to improve the stability of the fan during operation and further improve the rectifying capability of the rectifying fan blade, a further embodiment of the present invention is provided, in which the fan further includes a fourth fan blade 70, and the fourth fan blade 70 is mounted on the output shaft 21 and disposed between the first fan blade 31 and the second fan blade 32. Similarly, the blade length of the fourth blade 70 is smaller than the blade length of the second blade 32. It should be noted that the third fan blade 60 or the fourth fan blade 70 may be used as the rectifying fan blade, or the third fan blade 60 and the fourth fan blade 70 may be disposed at the same time.
The rectification fan blade is matched with the first fan blade 31 and the second fan blade 32, so that the adjustability of the air flow is stronger, the rectification fan blade has an additional driving effect on the air flow, the additional driving effect is concentrated in the central area of the air beam, and the area proportion and the flow velocity proportion of the central area and the boundary area of the air flow beam generated by the fan can be adjusted, so that the longer air outlet distance is obtained.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (11)

1. A fan, comprising:
the fan blade comprises a first fan blade and a second fan blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is positioned at the front end of the second fan blade,
the chord length of the root of the first fan blade is L1, the axial distance between the first fan blade and the second fan blade is L2, and L1/L2 epsilon [0.1,1];
the driving device is arranged on the fan blade and is used for providing power for the rotation of the fan blade;
the driving device is arranged on the bracket;
the fan further comprises an installation seat, a rotating shaft is arranged between the bracket and the installation seat, and the bracket can be vertically overturned through the rotating shaft and is installed on the installation seat; the rotating shafts comprise a first rotating shaft and a second rotating shaft, the first rotating shaft and the second rotating shaft are respectively and fixedly arranged at the left end and the right end of the bracket, and a first shaft sleeve and a second shaft sleeve for the rotation of the first rotating shaft and the second rotating shaft are correspondingly arranged on the mounting seat;
the periphery of the first rotating shaft and/or the second rotating shaft is provided with a clamping device, the clamping device comprises a sleeve, an elastic piece and a ball head rod, the elastic piece and the ball head rod are installed in the sleeve, one end of the sleeve is fixedly connected with the support, one end of the elastic piece is abutted or fixed with the support, the other end of the elastic piece is abutted or fixed with the ball head rod, the first shaft sleeve or the second shaft sleeve is provided with clamping grooves for the ball head rod to extend into, and the clamping grooves are distributed along the circumferential direction of the first shaft sleeve or the second shaft sleeve;
the support is provided with a first limiting seat and a second limiting seat, the first limiting seat is arranged on the periphery of the first rotating shaft in a ring mode, and the second limiting seat is arranged on the periphery of the second rotating shaft in a ring mode.
2. The fan of claim 1 wherein the chord length of the blade root of the first blade is L1 and the axial spacing of the first blade from the second blade is L2, L1/L2 e 0.4, 0.8.
3. The fan of claim 1 wherein the number of blades of the first blade and the second blade are prime numbers.
4. The fan of claim 1 wherein the diameter of the second fan blade is greater than the diameter of the first fan blade.
5. The fan as claimed in claim 1, wherein a free end of the first shaft is provided with a convex ring, and the convex ring is abutted against an end surface of the first shaft sleeve, which is far from the end of the bracket; and/or the free end of the second rotating shaft is provided with a second convex ring, and the second convex ring is abutted with the end face of the second sleeve, which is far away from one end of the bracket.
6. The fan of claim 5, wherein an end of the first limiting seat facing away from the bracket protrudes outwards along a radial direction of the first limiting seat to form a clamping protrusion, and a flange for blocking rotation of the clamping protrusion is arranged on the mounting seat.
7. The fan of claim 1, wherein at least one of the first shaft and the second shaft is hollow cylindrical.
8. The fan of any of claims 1 to 7, wherein the drive means has an output shaft, the first blade and the second blade being mounted to the output shaft, the fan further comprising a third blade mounted to the output shaft.
9. The fan of claim 8, wherein the third blade is disposed outside of the first blade, and wherein a blade length of the third blade is less than a blade length of the first blade.
10. The fan of claim 8 further comprising a fourth fan blade, said fourth fan blade mounted to said output shaft.
11. The fan of claim 10, wherein the fourth blade is disposed between the first blade and the second blade, and wherein a blade length of the fourth blade is less than a blade length of the second blade.
CN201810749396.8A 2018-07-09 2018-07-09 Fan with fan body Active CN108661946B (en)

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CN111779692B (en) * 2019-04-04 2021-08-31 广东美的环境电器制造有限公司 Fan with cooling device

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CH394468A (en) * 1960-01-26 1965-06-30 Motoren Werke Mannheim Ag Cooling air fan
JPH06336999A (en) * 1993-03-30 1994-12-06 Nippondenso Co Ltd Axial fan
CN101117895A (en) * 2007-09-06 2008-02-06 东方电气集团东方汽轮机有限公司 Variable-speed turbine final stage moving vane
CN201310490Y (en) * 2008-11-04 2009-09-16 秦彪 Electronic radiating fan
CN102661288A (en) * 2010-11-16 2012-09-12 松下电器产业株式会社 Axial-flow fan or diagonal-flow fan, and air conditioner mounted outdoor unit with same
AU2012268782A1 (en) * 2012-12-20 2014-07-10 Elta Group Africa (Pty) Ltd Platform for mounting an axial flow fan
CN106015104A (en) * 2016-07-13 2016-10-12 芜湖美智空调设备有限公司 Air conditioner, axial flow fan and stator blade of axial flow fan
CN106968973A (en) * 2017-05-09 2017-07-21 美的集团股份有限公司 Axial flow blower
CN207229425U (en) * 2017-08-25 2018-04-13 宁波宝工电器有限公司 Double blade motor components
CN209604282U (en) * 2018-07-09 2019-11-08 广东美的环境电器制造有限公司 Fan

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH394468A (en) * 1960-01-26 1965-06-30 Motoren Werke Mannheim Ag Cooling air fan
JPH06336999A (en) * 1993-03-30 1994-12-06 Nippondenso Co Ltd Axial fan
CN101117895A (en) * 2007-09-06 2008-02-06 东方电气集团东方汽轮机有限公司 Variable-speed turbine final stage moving vane
CN201310490Y (en) * 2008-11-04 2009-09-16 秦彪 Electronic radiating fan
CN102661288A (en) * 2010-11-16 2012-09-12 松下电器产业株式会社 Axial-flow fan or diagonal-flow fan, and air conditioner mounted outdoor unit with same
AU2012268782A1 (en) * 2012-12-20 2014-07-10 Elta Group Africa (Pty) Ltd Platform for mounting an axial flow fan
CN106015104A (en) * 2016-07-13 2016-10-12 芜湖美智空调设备有限公司 Air conditioner, axial flow fan and stator blade of axial flow fan
CN106968973A (en) * 2017-05-09 2017-07-21 美的集团股份有限公司 Axial flow blower
CN207229425U (en) * 2017-08-25 2018-04-13 宁波宝工电器有限公司 Double blade motor components
CN209604282U (en) * 2018-07-09 2019-11-08 广东美的环境电器制造有限公司 Fan

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