WO2022068825A1 - 花园吹风机 - Google Patents

花园吹风机 Download PDF

Info

Publication number
WO2022068825A1
WO2022068825A1 PCT/CN2021/121354 CN2021121354W WO2022068825A1 WO 2022068825 A1 WO2022068825 A1 WO 2022068825A1 CN 2021121354 W CN2021121354 W CN 2021121354W WO 2022068825 A1 WO2022068825 A1 WO 2022068825A1
Authority
WO
WIPO (PCT)
Prior art keywords
air inlet
air
extension rod
battery pack
axial
Prior art date
Application number
PCT/CN2021/121354
Other languages
English (en)
French (fr)
Inventor
喻学锋
段风伟
Original Assignee
苏州宝时得电动工具有限公司
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
Priority claimed from CN202011425445.6A external-priority patent/CN114319210A/zh
Application filed by 苏州宝时得电动工具有限公司 filed Critical 苏州宝时得电动工具有限公司
Priority to US18/029,045 priority Critical patent/US20230371449A1/en
Priority to EP21874481.1A priority patent/EP4223934A1/en
Publication of WO2022068825A1 publication Critical patent/WO2022068825A1/zh

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G20/00Cultivation of turf, lawn or the like; Apparatus or methods therefor
    • A01G20/40Apparatus for cleaning the lawn or grass surface
    • A01G20/43Apparatus for cleaning the lawn or grass surface for sweeping, collecting or disintegrating lawn debris
    • A01G20/47Vacuum or blower devices
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01HSTREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
    • E01H1/00Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
    • E01H1/08Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
    • E01H1/0809Loosening or dislodging by blowing ; Drying by means of gas streams
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00Axial-flow pumps
    • F04D19/002Axial flow fans
    • 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
    • F04D25/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0673Battery powered
    • 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
    • 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
    • F04D29/40Casings; Connections of working fluid
    • F04D29/52Casings; Connections of working fluid for axial pumps
    • F04D29/54Fluid-guiding means, e.g. diffusers
    • F04D29/541Specially adapted for elastic fluid pumps
    • F04D29/545Ducts

Definitions

  • the present application relates to the field of electric tools, in particular to a garden blower.
  • a garden blower is a common garden tool that uses airflow to the ground to remove dust or debris for cleaning.
  • the weight of the garden blower is supported by the user, and when the user holds the machine for cleaning, the height of the machine from the foreign objects on the ground, the angle formed between the machine and the ground, and the sweeping range of the machine swinging left and right are all determined by the user. The way you hold the machine is determined. Therefore, reducing the size and weight of the garden hair dryer and improving the man-machine effect has always been the subject of the diligent research of R&D personnel.
  • a garden blower capable of collecting scattered foreign objects, the garden blower comprising:
  • the air duct part including the axial air inlet that communicates with the outside world;
  • an air inlet shroud connected to the axial air inlet, the motor drives the axial flow fan to be able to rotate around the axis of the fan and introduce outside air from the axial air inlet through the air inlet shroud;
  • the air inlet shroud is connected to the axial air inlet, and includes a plurality of shroud holes for air to pass through, and the sum of the ventilation areas of the plurality of the shroud holes defines the effective ventilation of the air inlet shroud The total area;
  • a battery pack mounting part for detachably connecting with a battery pack for supplying power to the motor, the battery pack mounting part is disposed near the operating handle;
  • extension rod extending in the longitudinal direction, the operating handle and the air duct part are pulled apart from each other in the longitudinal direction by means of the extension rod;
  • the linear velocity of the blade edge of the axial flow fan is greater than 80 m/s, and the total effective ventilation area of the air inlet shroud is less than 12000 mm 2 .
  • the above-mentioned garden hair dryer comprehensively considers and configures the speed and volume of the motor, the diameter of the axial fan, the power of the motor and the nominal voltage and capacity of the battery pack, so that the design of small volume, small diameter and light weight can be maximized. change.
  • the size of the axial air inlet of the air duct and the total effective ventilation area of the air inlet shield affect and constrain the air volume, as well as the size of the motor and the axial flow fan.
  • the limitation of the total effective ventilation area of the hood also establishes the pattern of "small" air inlets and "thin" air ducts. While achieving low power consumption, it can also meet the battery life of the DC battery pack, and ensure the wind speed and air volume, so as to obtain higher blowing efficiency and better blowing effect.
  • the inlet shroud is configured to extend longitudinally on a fan axis of the axial fan
  • One end of the air inlet shield is connected to the axial air inlet, and the other end is supported on the extension rod.
  • the projected area of the orthographic projection on the plane where the face is located is S1;
  • One end of the extension rod connected to the air inlet shield falls on the orthographic projection area S2 of the orthographic projection on the plane where the rotating surface is located in the longitudinal direction;
  • the extension rod has a first end and a second end opposite to each other in the longitudinal direction, the extension rod is connected to the air inlet shroud through the first end, and the extension rod passes through the air inlet shroud.
  • the second end is connected to the operating handle;
  • the rotation of the axial flow fan can form a rotating surface, and the orthographic projection of the first end falling on the plane where the rotating surface is located along the longitudinal extension direction of the extension rod is always located within the outer contour boundary of the rotating surface,
  • the cross-sectional area of the air inlet shroud is less than 13300 mm 2 .
  • the air inlet shield is provided with a plug portion extending a predetermined distance in the extending direction of the extension rod, and the shield holes are circumferentially distributed on the periphery of the plug portion;
  • the garden blower further includes a first connection structure, and the first end of the extension rod is locked and connected with the plug portion of the air inlet hood through the first connection structure;
  • the orthographic projection of the first connecting structure on the plane where the rotation surface is located and the orthographic projection of the shield hole falling on the plane where the rotation surface is located are substantially not coincident .
  • the plug portion is configured as a hollow plug hole
  • the first connection structure includes:
  • the positioning member has a locking state that forms a snap connection with the inner wall of the positioning hole, so as to restrict the extension rod from being pulled out backward from the insertion portion.
  • the outer contour of the positioning member extends radially outward beyond the contour of the inner wall surface of the positioning hole.
  • the positioning member also has a natural state of maintaining its shape and being inserted into the plug portion, and in the natural state, the positioning member is in a preset position corresponding to the positioning hole;
  • the positioning member is configured to be able to change its shape to be in the locked state when subjected to an external force.
  • the first connection structure further includes a stopper portion disposed on the plug portion, the stopper portion can abut with the first end of the extension rod to prevent the extension The rod moves forward from the socket.
  • the air duct includes a main blowing pipe and an auxiliary blowing pipe communicated with the main blowing pipe, and the main blowing pipe is provided with the axial air inlet and the axial air inlet.
  • the opposite main air outlet, the auxiliary air pipe has an auxiliary air inlet communicated with the main air outlet, and in the direction perpendicular to the longitudinal direction, the cross-sectional area of the auxiliary air inlet is larger than that of the main air outlet
  • the cross-sectional area of the port there is a gap between the main blowing port and the auxiliary air inlet for external air to enter the auxiliary blowing pipe.
  • the garden blower is capable of discharging air at a relatively high wind speed and a relatively low volume of air through the auxiliary blowing duct in a first mode of operation, and a relatively low wind speed and a relatively high volume of wind to discharge air. switch between the second working modes;
  • the auxiliary blowing pipe is movably connected with the main blowing pipe, and the auxiliary blowing pipe can be retracted backward or extended forward in the longitudinal direction, so that the garden blower can be switched between the first working mode and the second working mode.
  • the nominal output voltage of the battery pack is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor is between 18000rpm and 35000rpm
  • the garden hair dryer is not connected.
  • the weight of the battery pack does not exceed 1.5kg
  • the maximum wind speed of the garden blower in the first operating mode is between 90mph and 110mph
  • the maximum air volume of the garden blower in the second operating mode is 350cfm to 500cfm between; or
  • the nominal output voltage of the battery pack is greater than 20V and less than 56V, the capacity of the battery pack is between 2Ah and 9Ah, the maximum speed of the motor is between 20000rpm and 38000rpm, and the garden hair dryer is not connected to the battery
  • the weight of the package does not exceed 1.8kg, the maximum wind speed of the garden blower in the first working mode is between 110mph and 180mph, and the maximum air volume of the garden blower in the second working mode is between 420cfm and 650cfm.
  • the length of the air duct portion is not more than 600mm.
  • the nominal output voltage of the battery pack is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor is between 18000rpm and 35000rpm
  • the diameter of the motor is less than or equal to 40mm
  • the maximum effective ventilation area of the cross section of the axial air inlet perpendicular to the axis of the fan is less than 9000mm 2
  • the outer diameter of the axial flow fan is greater than or equal to 50mm and less than or equal to 67mm; or
  • the nominal output voltage of the battery pack is greater than 20V and less than 56V, the capacity of the battery pack is between 2Ah and 9Ah, the maximum speed of the motor is between 20000rpm and 38000rpm, and the diameter of the motor is less than or equal to 45mm.
  • the maximum effective ventilation area of the cross section of the axial air inlet perpendicular to the axis of the fan is less than 13000 mm 2 , and the outer diameter of the axial flow fan is greater than or equal to 50 mm and less than or equal to 67 mm.
  • a gap is provided between the outer edge of the blade of the axial flow fan and the inner wall of the air duct;
  • the size of the gap in the radial direction is less than 1 mm.
  • the straight line distance from the highest point of the operating handle to the lowest point of the extension rod is less than 140 mm and greater than 40 mm.
  • a garden blower capable of collecting scattered foreign objects, the garden blower comprising:
  • the air duct part including the axial air inlet that communicates with the outside world;
  • an axial flow fan which is arranged in the air duct, and the motor drives the axial flow fan to rotate along the axis of the fan and introduce outside air from the axial air inlet;
  • the motor drives the axial flow fan to be able to rotate along the axis of the fan and introduce outside air from the axial air inlet through the air inlet shroud;
  • extension rod extending in the longitudinal direction, the operation handle and the air duct part are pulled apart from each other in the longitudinal direction by means of the extension rod;
  • the maximum height of the air inlet shield is H
  • the length of the whole machine is L
  • the ratio of H:L is less than 0.15
  • the air volume provided by the garden blower is greater than or equal to 350cfm, and less than or equal to 650cfm, so
  • the wind speed provided by the garden blower is greater than or equal to 70mph and less than 185mph.
  • the maximum width of the air inlet shroud is W, where W:L is less than 0.15.
  • the garden hair dryer further includes a battery pack mounting portion for detachable combination with a battery pack for supplying power to the motor, the battery pack mounting portion being disposed near the operating handle;
  • the number of the battery pack is one, the nominal output voltage of the battery pack is less than or equal to 20V, the maximum speed of the motor is between 18000rpm and 35000rpm, and the maximum height of the air inlet shield is the same as that of the garden blower.
  • the ratio of the length of the whole machine ranges from 0.09 to 0.133, and the ratio of the maximum width of the air inlet hood to the length of the whole machine of the garden blower ranges from 0.09 to 0.133, and the maximum wind speed of the garden blower ranges from 0.09 to 0.133.
  • the maximum air volume of the garden blower is between 350cfm and 500cfm; or
  • the number of the battery packs is two, the nominal output voltage of the battery pack is greater than 20V and less than 56V, the maximum speed of the motor is between 20000rpm and 38000rpm, and the maximum height of the air inlet shield
  • the ratio of the length of the whole machine of the garden blower is in the range of 0.11 to 0.16, and the ratio of the maximum height of the air inlet shield to the length of the whole machine of the garden blower is in the range of 0.11 to 0.16.
  • the maximum wind speed is between 110mph and 160mph, and the maximum wind volume of the garden blower is between 420cfm and 650cfm.
  • the overall length of the garden blower is between 850mm and 1000mm;
  • the maximum height of the air inlet shield is greater than 80mm and less than 130mm; the maximum width of the air inlet shield is greater than 80mm and less than 130mm.
  • the length of the air duct part is not more than 600mm, and the length of the whole machine of the garden blower is greater than or equal to 850mm and less than or equal to 1000mm;
  • the weight of the garden blower does not exceed 1.8kg.
  • the air duct part includes a main blowing pipe and an auxiliary blowing pipe communicated with the main blowing pipe, and an external air flow can be formed between the main blowing pipe and the auxiliary blowing pipe for the outside air to enter the A gap in the auxiliary blowing duct through which the garden blower can discharge air at a relatively high wind speed and a relatively low air volume through a first working mode of a relatively low wind speed and a relatively high air volume. Switch between the second working modes;
  • the ratio of the length of the air duct in the longitudinal direction to the length of the whole garden blower in the longitudinal direction is less than or equal to 70%, the weight of the garden blower does not exceed 1.8kg, and the maximum rotational speed of the motor is configured to be greater than or equal to 70%. or equal to 18000rpm and less than 40000rpm.
  • Fig. 1 is the structural representation of the garden blower in the prior art
  • FIG. 2 is a schematic structural diagram of a garden blower in a first working state according to an embodiment of the application
  • FIG. 3 is a schematic structural diagram of the garden blower shown in FIG. 2 in a second working state
  • FIG. 4 is a schematic cross-sectional view of a garden blower in a first working state according to an embodiment of the application
  • FIG. 5 is a schematic sectional view of the garden blower shown in FIG. 4 in a second working state
  • FIG. 6 is a schematic diagram of the position distribution of the center of gravity of the first weight unit, the center of gravity of the second weight unit, and the center of gravity of the whole machine in an embodiment of the application;
  • FIG. 7 is a schematic cross-sectional view of the position of the air inlet shield of the garden blower in a first working state according to an embodiment of the application;
  • FIG. 8 is a schematic cross-sectional view of the air inlet shield of the garden blower shown in FIG. 7 along the B-B direction;
  • FIG. 9 is a schematic diagram of the cooperation relationship between the positioning member of the extension rod and the air inlet shield when the positioning member is in a locked state according to an embodiment of the application;
  • FIG. 10 is a schematic structural diagram of the extension rod when the positioning member of the extension rod shown in FIG. 9 is in a natural state;
  • 11 is a schematic diagram of the positions of the center of gravity of the first weight unit, the center of gravity of the second weight unit, and the center of gravity of the whole machine in another embodiment of the application;
  • FIG. 12 is a schematic diagram showing the positions of the center of gravity of the first weight unit, the center of gravity of the second weight unit, and the center of gravity of the whole machine of a garden blower according to another embodiment of the application.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with “first”, “second” may expressly or implicitly include at least one of that feature.
  • plurality means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.
  • connection In this application, unless otherwise expressly specified and limited, the terms “installation”, “connection”, “connection”, “fixation” and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • fixing and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit.
  • the specific meanings of the above terms in this application can be understood according to specific situations.
  • the first feature is “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • a blower in the related art generally includes a main body casing 1, a duct, a fan for generating airflow, a motor for driving the fan, and a blowing pipe 2 connected to the main body casing.
  • the motor, the duct and the fan are all arranged in the mainframe casing 1, and the blowing pipe 2 is connected to the mainframe casing, and is connected with the mainframe casing to form an air flow channel.
  • the air inlet 3, the motor, the fan, the duct, and the air outlet 4 are arranged in sequence along the longitudinal direction of the blower.
  • the function of the duct is to guide the airflow generated by the fan.
  • the main frame 1 is also provided with a handle 5 for the operator to hold, and the motor is arranged outside the duct and below the handle 5 .
  • the main problem of the above-mentioned garden blower is that the realization of miniaturization, light weight and high working performance of the machine is contradictory.
  • the cleaning conditions encountered by the garden blower mainly include: fallen leaves and small garbage on the ground outside the home or in the park, debris between the cracks of the floor tiles, and wet leaves adhering to the ground.
  • the inventors found that, in order to meet the cleaning requirements for the above-mentioned working conditions, the air volume and wind speed provided by the garden blower should be large enough.
  • the miniaturization and light weight of functional parts will weaken the working effect of the garden blower, thereby reducing the cleaning ability, and the miniaturization and light weight of the battery pack will shorten the running time of the garden blower.
  • the inventors of the present application continue to study and find that the reason for the above problems in the related prior art is that structures such as motors, fans, and air duct structures are not properly configured and optimized.
  • the more prominent problem is that the design of the fan structure and size, the power and speed of the motor, and the air duct structure is not considered in combination with the blowing performance and power consumption, resulting in a small size and low mass. Smaller and less efficient, it is difficult to blow up, for example, heavier leaves that fall from the lawn and leaves that are in the crevices. Or, although the blowing efficiency of the whole machine with larger volume and mass is guaranteed, the noise is too high and the power consumption is too high. When the battery pack is used for power supply, the hair dryer can maintain a short working time and the human-machine experience is not good.
  • Fig. 2 shows a schematic structural diagram of the garden blower in a first working state according to an embodiment of the present application
  • Fig. 3 shows a structural schematic diagram of the garden blower shown in Fig. 2 in a second working state.
  • Fig. 2 shows a schematic structural diagram of the garden blower in a first working state according to an embodiment of the present application
  • Fig. 3 shows a structural schematic diagram of the garden blower shown in Fig. 2 in a second working state.
  • the garden blower 100 in the embodiment of the present application is used to perform cleaning work, and can collect scattered foreign objects, where the foreign objects may be leaves or garbage.
  • the outflow direction of the airflow corresponding to the air outlet is defined as the front (distal end). , the end away from the user.
  • the side where the airflow flows is defined as the rear (proximal end).
  • the proximal end of the garden blower 100 refers to the end of the garden blower 100 that is close to the user when the user uses the garden blower to clean.
  • the garden blower 100 extends longitudinally generally in the direction indicated by arrow A between the proximal end (rear) and the distal end (front).
  • the upper part of the drawing is defined as above, and the lower part of the drawing is defined as below.
  • the drawing outward is defined as the left side, and the drawing inward is defined as the right side; as shown in Figure 3, the drawing is defined as the left side inward, and the drawing outward is defined as the right side.
  • the height of the garden blower refers to the dimension of the garden blower in the up and down direction, and the width of the garden blower refers to the dimension of the garden blower in the left and right direction. It can be understood that the above definitions are only for illustration, and should not be construed as limitations on the present application.
  • the garden blower 100 in at least one embodiment disclosed in the present application includes a housing, a motor 40, a fan and a power supply.
  • the housing includes an air duct portion 10 extending substantially longitudinally, an operating handle 30 for the user to hold, and an extension rod 20 extending longitudinally for a predetermined distance.
  • the operation handle 30 and the air duct portion 10 are pulled apart from each other in the longitudinal direction by the extension rod 20 .
  • the air duct 10 includes an axial air inlet 12 (see FIGS. 4 and 5 ) communicating with the outside world, and the extension rod 20 is configured as a tubular extending longitudinally between its proximal and distal ends.
  • the extension rod 20 includes a handle support section connected to the operating handle 30 at the rear side, an air channel support section connected to the air channel section 10 at the front side, and a middle section connecting the handle support section and the air channel support section.
  • the axial air inlet 12 of the air duct portion 10 and the operating handle 30 are pulled apart from each other in the longitudinal direction by the middle section of the extension rod 20 .
  • the operating handle 30 is used for the user to operate and hold, and has the holding portion 32 for the operator to hold.
  • the operating handle 30 can be provided independently or integrally formed with the extension rod 20 .
  • the operating handle 30 may be configured to be independently supported at the proximal end of the extension rod 20 ; in other embodiments, at least a portion of the proximal end of the extension rod 20 may form the operating handle 30 .
  • the air duct portion 10 extends longitudinally along the first axis (not shown), and the grip portion 32 extends longitudinally along the second axis (not shown).
  • the first and second axes define a first plane (the vertical plane in FIGS. 2 and 3 ) that is in phase with the second plane (the horizontal plane in FIGS.
  • the first axis and the second axis are arranged at an angle, so that when the gripping portion 32 is held for blowing operation, the second axis of the gripping portion 32 is generally substantially parallel to the horizontal plane, which is very comfortable to operate and avoids the need for air blowing. Fatigue from long hours of work.
  • the first axis can also be parallel to the second axis, which is beneficial to reduce the size and volume of the garden blower 100 .
  • the operating handle 30 is also provided with a control switch 34 (see FIG. 4 and FIG. 5 ).
  • the control switch 34 is electrically connected to the motor 40 to control the opening and closing of the motor 40. It is true that the control switch 34 can also control the motor 40. Rotating speed.
  • Fig. 4 shows a schematic sectional view of the garden blower in an embodiment of the present application in a first working state
  • Fig. 5 shows a schematic sectional view of the garden blower shown in Fig. 4 in a second working state.
  • the air duct portion 10 is configured as a tubular body with a hollow interior, and the opposite ends of the air duct portion 10 are respectively provided with an axial air inlet 12 and an axial air outlet (not marked), it can be understood that, Hollow means that the air can flow smoothly between the axial air inlet 12 and the axial air outlet.
  • the air duct portion 10 includes a main blowing pipe 11 extending substantially in the longitudinal direction, and the number of the main blowing pipe 11 can be one and only one; Functional hair dryer.
  • the main blowing pipe 11 is located at the distal end of the extension rod 20, so that the overall length of the air duct 23 can be shortened, the flow resistance of the airflow in the air duct 10 is reduced, and the whole machine can have a smaller volume.
  • the fan is arranged in the air duct portion 10, and the motor 40 is connected with the fan to drive the fan to rotate, so that the fan rotates around a fan axis, thereby driving the air entering from the axial air inlet 12 side to form a flow to the axial air outlet side. airflow to power this garden blower.
  • the fan is an axial fan 50, which can provide better blowing effect than a centrifugal fan.
  • the axial fan 50 can be made of a fiber composite material structure, an aluminum metal structure, or a magnesium metal structure.
  • the fan axis of the axial fan 50 is coincident with the center line of the air duct 10, the blades of the axial fan 50 rotate to form a rotating surface, and the rotating surface is perpendicular to the fan axis of the axial fan 50 and the center line of the air duct 10. , which is conducive to the rapid flow of air.
  • the air duct portion 10 includes an upstream area from the axial air inlet 12 to the axial flow fan 50, and a downstream area from the axial flow fan 50 to the axial air outlet, and the length of the upstream area is smaller than the length of the downstream area .
  • the motor 40 is disposed in the upstream area of the air duct portion 10 and is disposed longitudinally displaced from the axial air inlet 12 .
  • the motor 40 has a motor shaft, which is connected to the axial fan 50 and can drive the axial fan 50 to rotate around its fan axis, thereby driving the air to move from the upstream area to the downstream area of the air duct 10 to form an airflow.
  • the motor shaft may also be connected to the axial flow fan 50 through a transmission mechanism, which is not limited here, for example, the transmission mechanism may be a planetary gear mechanism.
  • the axial flow fan 50 includes a hub 52 mated with the motor shaft and a plurality of blades 54 mounted on the hub 52, and a gap is provided between the outer edge of the blades 54 and the inner wall of the air duct 10, In order to prevent the blade from interfering with the inner wall of the air duct portion 10 and form a high-pressure and high-speed airflow, preferably, the size of the slit in the radial direction is less than 1 mm.
  • the axial flow fan 50 also includes a circumferential connecting belt, which surrounds and connects all the blades 54. The arrangement of the circumferential connecting belt can increase the rigidity of the axial flow fan 50 and prolong the service life of the axial flow fan 50 on the one hand. , to prevent the axial flow fan 50 from being damaged after a period of use; on the other hand, it can increase the stability of the axial flow fan 50 after high-speed rotation, and help reduce the noise generated by the axial flow fan 50 after high-speed rotation.
  • the power source is used to provide power for the motor 40, and the power source can be a DC power source, and specifically can be a rechargeable battery pack 60, and the battery pack 60 can be detachably mounted on the housing.
  • the casing is provided with one or two or more battery pack mounting portions for combining the battery packs 60 , the battery pack mounting portions are provided near the operating handle 30 , and the number of the battery packs 60 is the same as the number of the battery pack mounting portions. match. It should be understood that the battery pack mounting portion should be disposed close to the operating handle 30, so that the weight unit can be as close as possible to the operating grip point, thereby reducing the user's work fatigue.
  • the battery pack mounting portion is mounted on or integrally formed at the proximal end of the extension rod 20 or at a position close to the operating handle 30 .
  • the frontmost edge of the operating handle 30 is located between the rearmost edge of the battery pack 60 and the axial air inlet 12 in the longitudinal direction, and the frontmost edge of the operating handle 30 is connected to the shaft
  • the rearmost edge toward the air inlet 12 is longitudinally spaced by a predetermined distance.
  • the battery pack 60 located at the rear can balance the position of the center of gravity of the garden blower 100 in the longitudinal direction (the center of gravity here should be understood as the whole position in the state where the battery pack 60 is attached. center of gravity).
  • the rated voltage of a single battery pack 60 is 20V
  • G' is the center of gravity of the whole garden blower
  • J is the center of gravity of the first weight unit (battery pack 60 and handle 30 )
  • M The position of the center of gravity of the second weight unit (movement) of the garden blower.
  • the position of the center of gravity of the garden blower 100 is balanced in the longitudinal direction, so that the center of gravity of the whole machine is as close as possible to the grip portion 32, thereby reducing the user's work fatigue.
  • the battery pack 60 may be at least partially located below the operating handle 30 , or may be located behind the grip portion 32 .
  • the insertion direction of the battery pack 60 may be set at an angle to the extension direction of the axis of the extension rod 20 and the air duct portion 10 .
  • the angle may be 30 degrees to 60 degrees, and more preferably, the angle may be 45 degrees.
  • the number of battery packs 60 may be one, two or more, and different types and numbers of battery packs 60 may be selected according to specific designs for the garden outlet fan.
  • the battery pack 60 in the embodiment of the present application can supply power for at least two different types of DC tools, for example, it can be commonly used in the garden blower 100, lawn mowers, lawn mowers, chainsaws, pruning machines, angle grinders, electric hammers, Electric drills and other power tools.
  • the user can only purchase the bare metal of the garden blower 100, and use the battery pack 60 on other existing power tools to power the garden blower 100, so as to realize energy sharing among multiple tools.
  • the battery pack 60 can be fixed on the battery pack mounting portion by means of snapping or plugging.
  • the battery pack 60 includes slide rails (not numbered) on both sides of the battery pack 60 .
  • the buckle part and a number of electrode connecting pieces (not shown) are provided on the upper side.
  • the slide rail part can be matched with the battery pack mounting part to limit the position of the battery pack 60 in the radial direction, and the buckle part is connected with the shell to realize the axial position limit of the battery pack 60 , so that the battery pack 60 is constrained in the axial direction. Stable connection on the battery pack mounting part.
  • the garden blower 100 further includes a guide structure 80 disposed in the air duct portion 10 , and the guide structure 80 is located downstream of the axial flow fan 50 for guiding airflow to move.
  • the flow guide structure 80 includes a flow guide cone 82 , a cover 84 that accommodates the flow guide cone 82 , and a stationary vane 86 located between the flow guide cone 82 and the cover 84 .
  • the guide cone 82 is generally disposed along the moving direction of the air flow.
  • the guide cone 82 is located in the center of the airflow channel.
  • the guide cone 82 includes a casing and a conical cavity provided inside the casing.
  • an airflow circulation space is formed, and the cross-section of the vertical longitudinal axis of the circulation space is substantially annular.
  • the stationary vanes 54 are located within this annular flow space and are generally spaced apart.
  • the space between the two stationary vanes 54 is for airflow.
  • the stationary vanes 54 are inclined relative to the moving direction of the airflow, and the angle of inclination is preferably 5 to 15 degrees.
  • the radial size of the guide cone 82 is smaller than the radial size of the motor 40 . Accordingly, the volume of the guide cone 82 is smaller than the volume of the motor 40 , and the outer cover 84 is accommodated in the air duct portion 10 . , and is fixedly connected with the air duct part 10 .
  • the garden blower 100 further includes an air inlet shroud 70, which is connected to the axial air inlet 12 of the air duct 10, and the motor 40 can drive the axial flow fan 50 to rotate around the axis of the fan to allow the outside air to pass through the air inlet.
  • the shroud 70 is introduced from the axial air inlet 12, and an airflow channel for air flow is formed between the air inlet shroud 70 and the axial air outlet.
  • the air inlet shield 70 and the axial air inlet 12 may be configured to be detachably connected.
  • the air inlet shroud 70 is configured to extend in the direction of the fan axis of the axial flow fan 50 , one end of the air inlet shroud 70 is connected to the axial air inlet 12 , and the other end is supported on the extension rod 20 . It can be understood that one function of the air inlet shield 70 is to prevent the user's fingers from entering the interior of the air duct 10, thereby causing danger, and the other function is to prevent leaves or sundries from entering the air duct 10 during the cleaning operation. This causes the motor 40 and the axial fan 50 to malfunction.
  • the air inlet shroud 70 includes a plurality of shroud holes 74 (see FIG.
  • the air inlet shroud 70 is not arranged in a plane as a whole. For example, in the embodiments shown in FIGS.
  • the air inlet shroud 70 forms an arc-shaped air inlet surface extending longitudinally in a circular arc shape.
  • the maximum diameter of the shield hole 74 is not greater than 7 mm, and preferably, the maximum diameter of the shield hole 74 is not greater than 4 mm. In this way, while protecting the human body, impurities can also be prevented from entering the axial air inlet 12 .
  • the motor 40 , the axial flow fan 50 and the flow guide structure 80 are arranged in the air duct portion 10 and are vertically separated from the operating handle 30 for holding by a certain distance, so that On the one hand, on the premise that the length of the garden blower 100 is constant, the length of the air duct 10 is shortened.
  • the motor 40 drives the axial flow fan 50 to rotate at a high speed, the outside air can be quickly and sufficiently introduced into the air duct. Inside 10 , the air flows rapidly, the airflow loss is small, and a sufficient amount of airflow is driven by the motor 40 to flow rapidly and the wind pressure is large.
  • the radial dimension of the air duct portion 10 is reduced, thereby optimizing the performance and volume of the garden blower 100 , and further reducing the weight of the garden blower 100 .
  • the air duct portion 10 including the movement is separated from the operating handle 30, and the height dimension of the garden blower 100 is also reduced, so that the volume and weight of the whole machine are reduced.
  • the performance of the garden blower 100 mainly depends on the air volume and wind speed of the product, and the air volume and wind speed of the product are mainly determined by the blowing effect of the axial fan 50 and the structure of the air duct. Among them, the blowing effect of the axial flow fan 50 is mainly determined by the air volume and wind pressure of the axial flow fan 50.
  • the inventors of the present application know through analysis that if the rotational speed of the motor 40 and the angle of the fan blades are set to be quantitative, under the same air duct structure, the larger the diameter of the axial fan 50 is, the higher the air volume and speed can be obtained, but at the same time As a result, the power consumption of the hair dryer will be higher, and when the battery pack 60 is used as a power source, the working time of the hair dryer is limited. Therefore, in order to reduce the power consumption of the blower, the diameter of the axial flow fan 50 tends to be reduced.
  • the power consumption of the garden blower 100 is gradually reduced, but at the same time the resulting consequences Yes, the air volume and wind speed of the hair dryer also generally show a decreasing trend. Therefore, while considering the power consumption and the blowing effect of the hair dryer, the diameter of the axial flow fan 50, the rotational speed of the motor 40 and the air duct structure need to be reasonably configured, that is, reasonable parameter configuration is expected, so that the wind speed and air volume can meet the performance requirements. However, the power consumption is within a controllable range, and the volume and mass are reduced compared to the garden blower 100 in the prior art.
  • the rotational speed of the axial flow fan 50 is roughly inversely proportional to the diameter D of the axial flow fan 50, that is to say, the desired air volume and wind pressure are maintained.
  • the rotational speed of the axial fan 50 is mainly determined by the motor 40. Therefore, in order to maximize the design of small volume, small diameter and light weight, With the motor 40 having a higher rotational speed, the diameter of the axial flow fan 50 can theoretically be smaller.
  • the motor 40 with large output power, small volume, small diameter and high rotation speed can realize the lightweight of the garden blower 100, and the size of the axial flow fan 50 driven by the motor 40 can also be significantly reduced.
  • the weight is also reduced, and correspondingly, the air duct 10 surrounding the axial flow fan 50 can also be designed to be smaller in size and weight than the existing garden blower 100 on the market.
  • the consequent consequence is that the higher the rotation speed of the motor 40 is, the higher the maximum output power of the motor 40 is, and the nominal voltage and capacity of the battery pack 60 also need to be considered to ensure that the garden blower 100 has a high output power. length of work.
  • the blade angle is set to be quantitative, and the linear velocity V of the blade edge of the axial fan 50 is positively correlated with the rotational speed V of the axial fan 50 and the diameter D of the axial fan 50 .
  • the linear velocity of the blade edge of the axial flow fan is limited to be greater than 80 m/s, and the total effective ventilation area of the air inlet shroud is limited to less than 12000 mm 2 .
  • the linear velocity of the blade edge of the axial flow fan is greater than 83 m/s, and the effective ventilation area of the air inlet shroud is less than 9000 mm 2 .
  • the speed and volume of the motor 40, the diameter of the axial flow fan 50, the power of the motor 40, and the nominal voltage and capacity of the battery pack 60 are comprehensively considered and configured, so that a small volume, small diameter, and lightweight design can be achieved. maximize.
  • the size of the axial air inlet 12 of the air duct 10 and the total effective ventilation area of the air inlet shroud 70 influence and constrain the air volume, and also constrain and influence the size of the motor 40 and the size of the axial flow fan 50.
  • the pattern of "small" air inlets and "thin" air ducts is also established. While achieving low power consumption, it can also meet the battery life of the DC battery pack 60 and ensure the wind speed and air volume, so as to obtain higher blowing efficiency and better blowing effect.
  • the motor 40 , the axial flow fan 50 and the guide structure 80 of the garden blower 100 are all arranged in the air duct portion 10 , and the motor 40 is arranged in the axial air inlet 12 of the air duct portion 10 and the axial flow fan 50 upstream area in between.
  • the diameter of the motor 40 is not higher than 45mm, usually 36mm to 45mm, and a certain gap needs to be maintained between the motor 40 and the inner wall of the air duct 10 to provide sufficient air intake. quantity.
  • the motor 40 may adopt an outer rotor brushless motor 40, which can achieve high rotation speed while having a small diameter and volume.
  • the maximum rotational speed of the outer rotor brushless motor 40 is configured to be greater than 18,000 rpm and less than 40,000 rpm.
  • the diameter of the motor 40 is not higher than 45mm. Preferably, it can be configured between 36 and 45 mm. Therefore, the diameter of the motor 40 can be set to 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm.
  • the ratio of the vertical longitudinal cross-sectional area of the motor 40 to the cross-sectional area of the axial air inlet 12 of the air duct portion 10 is less than 0.5.
  • the diameter of the axial air inlet 12 of the air duct 10 is greater than 50 mm and less than 130 mm.
  • the diameter of the axial air inlet 12 of the air duct 10 can be 50 mm, 55 mm, 65 mm, 70 mm, 80 mm, 85 mm, 93 mm, 100 mm , 110mm, 120mm.
  • the upstream area of the air duct 10 includes several wind passage surfaces.
  • the wind passage surface is a cross section of the upstream region of the air duct portion 10 perpendicular to the direction in which the airflow moves.
  • the area of the smallest air passage surface in the upstream area is larger than the area of the rotating surface formed by the rotation of the blades 54 of the axial flow fan 50 , so as to ensure that the continuous supply of air contacts the blades 54 of the axial flow fan 50 . , so as to ensure uninterrupted blowing.
  • the amount of air supplemented to the axial flow fan 50 in the upstream area depends on the smallest air flow area in the upstream area. Therefore, even if the airflow area in other places in the upstream area is larger, if the smallest airflow surface area does not change, the air intake volume of the axial fan 50 will not change. Therefore, the air intake volume of the axial flow fan 50 can be increased only by increasing the minimum air passage area of the entire upstream area. From FIG. 4 and FIG.
  • the air passage area of this part can be guaranteed to be larger than that of the axial flow fan 50 area of rotation.
  • the part surrounding the motor 40 in the upstream area is defined as the surrounding area. Due to the blocking of the motor 40 , the wind passing area of the surrounding area will be relatively small. However, in order to ensure good blowing efficiency, the minimum area of the air passage area along the longitudinal direction of the surrounding area is designed to be larger than the area of the rotating surface formed by the rotation of the blades 54 of the axial flow fan 50 .
  • the output power of the motor 40 is set to be different for different power sources.
  • the nominal output voltage of the battery pack 60 is less than or equal to 20V, and the maximum output power of the motor 40 is 280-400W; the nominal output voltage of the battery pack 60 is greater than 20V and less than 56V, and the maximum output power of the motor 40 is 500-1100W.
  • the weight of the motor 40 is in the range of 0.1-0.3 kg. Therefore, the weight of the motor 40 can be set to 0.15kg, 0.25kg, 0.26kg, 0.27kg, 0.28kg, 0.29kg.
  • the effect of the movement of the high-speed and small axial-flow fan 50 is further maximized.
  • the inventor of the present application found that, The rotational speed, diameter of the motor 40 , the cross-sectional area of the axial air inlet 12 and the diameter of the axial flow fan 50 can be further optimized and parameterized.
  • the nominal output voltage of the battery pack 60 is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is between 18000rpm and 35000rpm
  • the diameter of the motor 40 is less than or equal to 40mm.
  • the working time of the battery pack is not less than 6min, the effective ventilation area of the axial air inlet 12 is less than 9000mm 2 , and the outer diameter of the axial fan 50 is greater than or equal to 50mm and less than or equal to 67mm. Therefore, the effective ventilation area of the axial air inlet 12 can be 8500 mm 2 , 7500 mm 2 , 7000 mm 2 and so on.
  • the nominal output voltage of the battery pack 60 is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is 27000rpm
  • the working time of the battery pack is greater than or equal to 8min
  • the motor The diameter of 40 is less than or equal to 40mm
  • the diameter of the axial air inlet 12 is 80mm-100mm
  • the effective ventilation area of the axial air inlet is less than 6500mm 2
  • the diameter of the axial fan 50 is 59mm.
  • the nominal output voltage of the battery pack 60 when the nominal output voltage of the battery pack 60 is greater than 20V and less than 56V, the capacity of the battery pack 60 is between 2Ah and 9Ah, the maximum speed of the motor 40 is between 20000 and 38000rpm, and the working time of the battery pack is not long. Less than 6 minutes, the diameter of the motor 40 is less than or equal to 45mm, the effective ventilation area of the axial air inlet 12 is less than 13000mm 2 , and the outer diameter of the axial fan 50 is greater than or equal to 50mm and less than or equal to 67mm. Therefore, the effective ventilation area of the axial air inlet 12 can be 9200 mm 2 , 9800 mm 2 , 11000 mm 2 and so on.
  • the nominal output voltage of the battery pack 60 is greater than 20V and less than 56V
  • the capacity of the battery pack 60 is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is 32000rpm
  • the diameter of the motor 40 is less than or equal to 45mm.
  • the diameter of the axial air inlet 12 is 100mm-120mm
  • the working time of the battery pack is greater than or equal to 10min
  • the effective ventilation area of the axial air inlet is less than 8000mm 2
  • the diameter of the axial flow fan 50 is 60mm.
  • the dimensions of the motor 40, the axial flow fan 50 and the air duct 10 of the garden blower 100 are smaller, and the size of the garden blower 100 is reduced compared to the prior art. It is more compact and the weight of the whole machine is lighter, which improves the user experience.
  • the extension rod 20 has a first end and a second end opposite to each other in the longitudinal direction, and the first end and the second end may be opposite ends along the longitudinal extension direction of the extension rod 20 .
  • the first end may be the distal end of the extension rod 20
  • the second end may be the proximal end of the extension rod 20 .
  • the extension rod 20 can be connected to the air inlet shield 70 through the first end, and can be connected to the operating handle 30 through the second end.
  • the orthographic projection of the first end falling on the rotation surface formed by the rotation of the axial flow fan along the longitudinal extension direction of the extension rod 20 is always located in the rotation of the axial flow fan 50 . within the outer contour boundary of the face. It can be understood that since the axial flow fan 50 is installed in the air duct portion 10, the extension rod 20 and the air duct portion 10 do not overlap in size in the radial direction, and the overall shape of the garden blower is regular and compact.
  • the grip portion 32 of the operating handle 30 extends longitudinally along the second axis
  • the extension rod 20 and the air duct portion 10 extend longitudinally along the first axis
  • the first axis is parallel to the second axis. Therefore, the distance between the highest point of the operating handle 30 and the lowest point of the extension rod 20 , that is, the distance between the upper side of the grip portion 32 and the lower side of the extension rod 20 may be greater than 40mm and less than 140mm.
  • the linear distance is greater than 128 mm and less than 135 mm; more preferably, the linear distance from the highest point of the operating handle 30 to the lowest point of the extension rod 20 is 130 mm.
  • the distance between the highest point and the lowest point of the garden blower 100 connected to the battery pack 60 can be 150mm ⁇ 170mm, preferably 159mm, for example, as shown in FIG.
  • the distance from the highest point to the lowest point is 260-270mm.
  • the extension rod 20 since the extension rod 20 is connected within the boundary range of the outer contour of the air inlet shroud 70 , it inevitably occupies part of the air inlet area of the air inlet shroud 70 . To a certain extent, the air intake volume of the air intake shroud 70 is affected. In order to make the cross-sectional area of the air inlet channel formed between the air inlet shield 70 and the extension rod 20 in a reasonable range, the air flow can enter and flow stably while ensuring the air intake volume of the garden blower. The fan area creates a high-speed, high-pressure airflow that effectively guarantees the performance of the garden blower.
  • the air inlet shroud 70 is configured to extend on the fan axis of the axial flow fan 50, the axial flow fan 50 rotates to form a rotating surface, and the air intake shroud 70 falls on the plane where the rotating surface is located in the longitudinal direction.
  • the projected area of the orthographic projection on S1 is S1
  • the end of the extension rod connected to the air inlet shield 70 falls along the longitudinal direction of the orthographic projection area S2 on the plane where the rotating surface is located.
  • the ratio of S1 and S2 is greater than or equal to 6 and less than or equal to 16.
  • the cross-sectional area of the first end of the extension rod 20 connected to the axial air inlet 12 in the vertical longitudinal direction is not greater than 1256 mm 2 and not less than 314 mm 2 .
  • the cross-sectional area of the first end of the extension rod 20 connected to the axial air inlet 12 in the vertical longitudinal direction is not greater than 920 mm 2 and not less than 616 mm 2 .
  • the cross-sectional area of the extension rod 20 in the vertical longitudinal direction is too large, which will inevitably affect the air intake and the lightweight of the whole machine, while the cross-sectional area is too small, because the extension rod 20 needs to support the air duct 10 and the battery before and after. Package 60, extension rod 20 is less reliable. Therefore, the cross-sectional area of the end of the extension rod 20 connected to the axial air inlet 12 in the vertical longitudinal direction is set within the aforementioned specific range, which can ensure the air intake of the garden blower while taking into account the light weight and reliability of the whole machine. Air volume and performance.
  • the garden blower is basically operated by the user holding the machine, for the hand-held apparatus, the user may experience arm fatigue when holding the apparatus for a long time, especially for the one-handed hand-held apparatus. Therefore, it has always been an urgent problem to be solved that the whole machine can be substantially compressed in terms of volume and weight under the condition of achieving basically similar performance.
  • the clever design of the short air duct portion 10 and the cross-sectional size of the superimposed air duct portion 10 is also reduced, so that under the condition that the longitudinal dimension and the radial dimension are both shortened, the overall size and weight of the whole machine are reduced. There have been significant changes.
  • the air inlet shield 70 is connected to the axial air inlet 12, and the other end is supported on the extension rod 20. Therefore, the air intake shield 70 will affect the radial dimension of the whole machine.
  • One end of the air intake shield 70 is connected to the extension rod 20.
  • the axial air inlets 12 of the air duct portion 10 are connected, so the cross-sectional size of the air duct portion 10 is reduced, and the cross-sectional size of the air inlet shield 70 is inevitably reduced, which is beneficial to reduce the size of the whole machine.
  • the cross-sectional area of one end of the air inlet shroud 70 connected to the axial air inlet 12 in the vertical longitudinal direction is less than 13300 mm 2 .
  • the air inlet shroud The cross-sectional area of one end of the 70 connecting the axial air inlet 12 is not less than 3800mm 2 and not more than 11300mm 2 .
  • the air inlet shroud 70 is approximately arc-shaped, with a diameter of 110 mm, and the radial cross-sectional area of the extension rod 20 is 907 mm 2 , that is, the air inlet shroud 70 falls on the plane where the rotating surface is located in the longitudinal direction.
  • the ratio between the projected area S1 of the orthographic projection and the projected area S2 of the orthographic projection of the end of the extension rod 20 connected to the air inlet shield 70 falling on the plane of the rotating surface in the longitudinal direction is about 10.47.
  • the extension distance of the air inlet shroud 70 on the fan axis of the axial flow fan 50 is not less than 62 mm. In this way, the air intake volume of the garden blower is further ensured, so that the performance requirements of the garden blower can be met.
  • Fig. 7 shows a schematic cross-sectional view of the position of the air inlet hood of the garden blower in the first working state according to an embodiment of the present application
  • Fig. 8 shows the air inlet hood of the garden blower shown in Fig. 7 along the B-B direction cross-sectional schematic diagram.
  • the air inlet shroud 70 is provided with a plug portion 72 extending a predetermined distance in the longitudinal direction, the hood holes 74 are circumferentially distributed on the periphery of the plug portion, and the garden blower further includes In the first connection structure (not marked in the figure), the first end of the extension rod 20 is connected with the plug portion 72 of the air inlet shield 70 through the first connection structure.
  • the orthographic projection of the first connecting structure falling on the plane where the rotating surface of the axial flow fan 50 is located along the extending direction of the extension rod 20 is basically the orthographic projection of the shield hole 74 falling on the plane where the rotating surface is located along the extending direction of the extending rod 20 not coincident.
  • the first connection structure is located on the inner ring of the air inlet shield 70, and the shield hole 74 is located on the periphery of the plug-in portion 70, and the two do not interfere with each other and do not block each other, so that the air inlet shield 70 is in contact with the extension rod.
  • the first connection structure will not occupy the area of the shield hole 74, so that the air intake volume will not be affected.
  • the cross section of the plug portion 72 along the direction perpendicular to the longitudinal extension direction of the extension rod 20 is elliptical, and in some other embodiments, it may also be a circle
  • the shape or the square shape is not limited here.
  • the orthographic projection of the first connecting structure falling on the plane of the rotating surface of the axial fan 50 along the extending direction of the extension rod 20 and the orthographic projection of the shield hole 74 falling on the plane of the rotating surface along the extending direction of the extending rod 20 The orthographic projections are basically not coincident. Substantially non-overlapping here means that the projection of the first connection structure on the plane of the rotating surface and the projection of the shield hole 74 on the plane of the rotating surface are separated, tangent or intersected within the range of 5mm. Further, taking the fixing method by screwing as an example, the screw is inserted and connected to the extension rod 20 from the outer edge of the air inlet shroud 70.
  • the screw occupies a large size in the radial direction, making the first connection
  • the maximum linear dimension that intersects the projection of the structure on the plane where the rotating surface is located and the projection of the shield hole 74 on the plane where the rotating surface is located is greater than 5 mm. In this way, part of the air inlet area is sacrificed, and the installation steps are more complicated. Therefore, in the fixing method by screwing, the orthographic projection of the first connecting structure falling on the plane of the rotation surface of the axial flow fan 50 along the extension direction of the extension rod 20 and the shield hole 74 falling on the rotation surface along the extension direction of the extension rod 20 Orthographic projections on the plane on which they lie do not fall within the above-defined "substantially misaligned" situation.
  • the plug portion 72 is configured as a hollow plug hole, and the first end of the extension rod 20 is plugged and locked into the plug portion 72 to achieve a locked connection between the two.
  • the plug portion 72 on the air inlet shroud 70 can also be configured to be inserted and locked into the inner cavity of the first end of the extension rod 20 . It should be understood that the first end of the extension rod 20 and the plug-in portion 72 cover each other and extend a distance along the longitudinal direction, so that the joint area between the extension rod 20 and the air inlet shroud 70 is increased, so that the extension rod 20 can be improved. The strength of the connection with the air inlet shroud 70.
  • the extension rod 20 can be wrapped along the circumferential direction of the extension rod 20 , so that the connection strength and stability of the extension rod 20 and the air inlet shield 70 are better.
  • Fig. 9 shows a schematic diagram of the cooperation relationship between the positioning member of the extension rod and the air inlet shield when the positioning member of the extension rod is in a locked state in an embodiment of the present application
  • Fig. 10 shows the positioning member of the extension rod shown in Fig. 9 when the positioning member is in a natural state Schematic diagram of the extension rod.
  • the first connection structure includes a fitting member disposed on the extension rod 20 and a locking member disposed on the insertion hole.
  • the locking member may be defined as a positioning hole 76 on the inner wall of the plug-in portion
  • the fitting member may be a shape-adjustable positioning member 22 disposed near the outer wall of the first end of the extension rod 20 or disposed on the first end of the extension rod 20 .
  • the positioning member 22 has a locked state in which it is engaged with the inner wall of the positioning hole 76 . In the locked state, the outer contour of the positioning member 22 extends radially outward from the outer contour of the inner wall of the positioning hole 76 to limit the extension rod 20 from The mating hole comes out backwards.
  • the positioning member 22 has a natural state of maintaining its shape inserted into the insertion hole (see FIG. 10 ), and a locked state of changing its shape when subjected to an external force (see FIG. 9 ).
  • the positioning member 22 In the natural state, the positioning member 22 is in a preset position corresponding to the positioning hole 76 , and in the locked state, the outer contour of the positioning member 22 exceeds the outer contour of the inner wall surface of the positioning hole 76 in the radial direction to limit the extension rod 20 from The mating hole comes out backwards.
  • the inner wall of the insertion portion 72 is provided with a plurality of positioning holes 76 , and the plurality of positioning holes 76 are distributed at intervals in the circumferential direction of the insertion portion 72 .
  • the shape of the positioning member 22 is adjustable, and it can be a rigid structure or an elastic structure. Specifically, in one embodiment, when the positioning member 22 is a rigid structure, such as an aluminum plate, to switch from the natural state to the locked state, the operator needs to use an auxiliary member to push the positioning member 22 outward, so that the positioning member 22 changes shape and moves toward the locked state. Spread out. When the positioning member 22 is an elastic structure and switches to a locked state in a natural state, the positioning member 22 releases the accumulated elastic potential energy, so that the positioning member 22 changes its shape and expands outward.
  • the first connection structure is located inside the air inlet shield 70 as a whole. - Stability of the connecting structure.
  • the fitting can also be defined as a slot recessed from the wall surface of the extension rod 20, the slot can be a hole that penetrates through the inside and the outside, or a semi-closed groove, and the locking piece can be defined as a self-insertion
  • the inner wall surface of the connecting portion 22 or the end edge of the inserting portion 72 is a protruding portion protruding inward.
  • the cover 70 and the extension rod 20 may form a locking fit with the raised portion through the aforementioned slot.
  • the plug portion 72 has an open end for inserting the extension rod 20 , the open end can be necked inward to form a necking structure, and the maximum outer contour size of the open end is larger than the size of the extension rod 20 at the positioning member 22 . Maximum outer contour size. Specifically, when the first end of the extension rod 20 is engaged with the plug-in portion 72 , it can be easily inserted into the plug-in portion 72 , and there is no need to use a large external force to insert the first end of the extension rod 20 into the plug-in portion 72 middle.
  • the first connection structure further includes a stopper 78 disposed at the end of the plug portion 72 , and the stopper 78 can abut with the end of the extension rod 20 to prevent the extension rod 20 It moves forward from the insertion hole of the insertion part 72 .
  • the stopper portion 78 is a stopper block protruding toward the insertion hole.
  • the extension rod 20 is provided with a hole groove 26 on the outer wall near the first end, and the positioning member 22 can be formed between the hole groove 26 and the end edge of the first end.
  • the distance between the groove 26 and the end edge of the first end is configured to be equal to the distance between the positioning hole 76 and the stopper 78 .
  • the positioning member 22 can be formed on the extension rod 20 by means of stamping, and the manufacturing method is relatively simple, and no other materials are required, and the cost is lower.
  • the extension rod 20 not only plays the role of connecting the operating handle 30 and the air duct part 10, but also plays a supporting role. Therefore, the supporting material of the extension rod 20 needs to have a certain strength.
  • the extension rod 20 is made of an aluminum tube, which not only has a certain support strength, but also the support made of the aluminum tube material is lighter and has better portability.
  • the wall thickness of the extension rod 20 is 1 ⁇ 2mm, with a small volume.
  • the extension rod 20 can be roughly in the form of a hollow tubular structure, and has an auxiliary air duct (not shown), an air inlet and an air outlet 24 communicating with the auxiliary air duct.
  • the air outlet 24 communicates with the air duct 10
  • the air inlet communicates with the outside air
  • forms an auxiliary air through the auxiliary air duct which converges with the main air entering through the shroud hole 74 at the axial flow fan.
  • the airflow outlet 24 may be disposed close to the first end, for example, may be disposed at the lower portion of the first end, or directly disposed at the end of the first end, that is, the first end is open, for communicating the auxiliary air duct with the
  • the air duct portion 10 enables the airflow in the auxiliary air duct to enter the air duct portion 10 through the airflow outlet 24 .
  • the airflow inlet can be located near the second end and on the outer part of the extension rod 10 on the operating handle, or the airflow inlet can be located near the second end and on the inner part of the extended rod 20 on the operating handle 30, or the airflow inlet can be located on the inner part of the operating handle 30.
  • the end of the second end ie, the second end
  • the operation handle 30 may be provided with a The secondary air inlet 36 (see FIG. 7 ) communicated with the air inlet, the secondary air inlet 36 is used to communicate the external air flow and the auxiliary air duct.
  • the motor 40 will generate a negative pressure area near the first end of the extension rod 20 during operation, so that the outside air can be sucked into the auxiliary air duct of the extension rod 20 through the air inlet, and an auxiliary air flow is formed in the extension rod 20 .
  • the main blowing port 14 of the main blowing pipe 11 of the present application has a small cross-sectional area in the direction perpendicular to the longitudinal direction, which can pressurize the incoming airflow to form a higher wind speed.
  • the main blowing air outlet of the main blowing pipe 11 14 has a cross-sectional area perpendicular to the longitudinal direction of less than 4000 mm 2 .
  • the air duct 10 includes the main blowing duct 11 and an auxiliary blowing pipe 13 communicated with the main blowing pipe 11 .
  • a gap can be formed between the main blowing pipe 11 and the auxiliary blowing pipe 13 for external airflow to enter the auxiliary blowing pipe 13 .
  • the garden blower can operate through the auxiliary blowing duct 13 in a first operation mode of discharging air at a relatively high wind speed and a relatively low air volume and a second operation mode of discharging air at a relatively low wind speed and a relatively high air volume switch between modes.
  • the main blowing pipe 11 is in fluid communication with the auxiliary blowing pipe 13
  • the main blowing pipe 11 is supported at the distal end of the extension rod 20, and there is the aforementioned gap between the main blowing pipe 11 and the auxiliary blowing pipe 13, so that the outside air can pass through all the The gap enters into the auxiliary blowing pipe 13 , thereby increasing the air volume of the garden blower 100 .
  • the proximal end of the main blowing pipe 11 is provided with the axial air inlet 12, the distal end of the main blowing pipe 11 is provided with a main blowing port 14 (see FIG. 4) opposite to the axial air inlet 12, and the auxiliary blowing pipe 13 has a
  • the auxiliary air inlet communicated with the main blowing port 14 and the nozzle located at the distal end of the auxiliary air inlet in the longitudinal direction, and the nozzle forms an air outlet.
  • the auxiliary air inlet surrounds at least part of the main blowing port 14, the cross-sectional area of the air outlet of the auxiliary blowing pipe 13 in the direction perpendicular to the longitudinal direction is larger than the cross-sectional area of the main blowing port 14, and the inner ring of the auxiliary air inlet and the main blowing port are Between the outer rings of the 14 is formed the above-mentioned gap through which the outside air can flow into the auxiliary blowing pipe 13 .
  • the blowing volume of the garden blower 100 can also meet the demand.
  • the auxiliary blowing pipe 13 is movably connected with the main blowing pipe 11, so that the garden blower can be switched between the first working mode and the second working mode.
  • the movable connection can be understood as the auxiliary blowing pipe 13 can be detachably separated from the main blowing pipe 11, and the auxiliary blowing pipe 13 can be retracted backward by a preset distance or extended forward, so that the garden blower 100 can be detached from the main blowing pipe 11. Switch between the first working mode and the second working mode.
  • the garden blower 100 is in the first working mode, the outside air enters from the axial air inlet 12 and is blown out from the main air outlet 14; the garden blower 100 is in the second working mode, and the outside air enters from the axial air inlet 12 , and the second working mode that is blown out from the nozzle of the auxiliary blowing pipe 13, the user can freely choose the first working mode or the second working mode according to the cleaning needs, and the user can choose according to different working conditions. match the pattern to work. For example, when it is necessary to clean the courtyards, parks, streets and other places covered with fallen leaves, the user can choose the second working mode with relatively large air volume and relatively small wind speed, so as to quickly gather the fallen leaves in the cleaning area within a unit time. together; need to clean the wet leaves adhering to the ground, the user can choose the first working mode with relatively small air volume and relatively large wind speed, with sufficient force to quickly peel the foreign objects from the ground.
  • the axial air outlet of the garden blower 100 is the main air outlet 14 of the main blowing pipe 11 .
  • the axial air outlet of the garden blower 100 is the air outlet of the auxiliary blowing pipe.
  • the auxiliary air inlet is flared and the cross-sectional area of the auxiliary air inlet in the direction perpendicular to the longitudinal direction is larger than that of the air outlet. cross-sectional area.
  • the auxiliary blowing pipe 13 is configured in a truncated cone shape, so as to compress the airflow entering the auxiliary blowing pipe 13 and increase the wind speed again.
  • the air outlet of the auxiliary blowing pipe 13 will affect the air volume.
  • the ratio of the cross-sectional area to the cross-sectional area of the main air outlet 14 is between 2 and 3.5.
  • the angle formed between the outer wall of the auxiliary blowing pipe 13 and the axis of the fan is about 3 degrees to 9 degrees. The air pressure in the auxiliary blowing pipe 13 can be increased without affecting the air volume.
  • the air entering the air duct 10 from the axial air inlet 12 is concentrated into a high-speed moving air flow under the rotation of the axial fan 50 , and diffuses from the axial air inlet 12 to the main blowing port 14 .
  • the airflow diffused from the axial air inlet 12 to the main air outlet 14 includes a high-speed area around the fan axis of the axial flow fan 50 and a low-speed area around the high-speed area.
  • the cross-sectional area of the axial air inlet 12 is designed to be larger, while the cross-sectional area of the downstream area remains basically unchanged when the air flows to the main blowing port 14 . .
  • the cross-sectional area of the main air outlet 14 is smaller than that of the axial air inlet 12 .
  • the wind speed of the air flowing into the auxiliary blowing pipe 13 at the front end of the auxiliary air inlet naturally decreases, and it is mixed with the low-speed air flow, but if Uneven mixing of high-speed airflow and low-speed airflow will also affect the blowing effect. Therefore, the cross-sectional area of the axial air inlet 12 and the cross-sectional area of the main air outlet 14 together constrain and influence the final air outlet speed.
  • the cross-sectional area of the axial air inlet 12 is too large, or the cross-sectional area of the main air outlet 14 or the air outlet at the auxiliary air duct 13 is too small, it is not conducive to the formation of stable and high-speed airflow.
  • the ratio of the cross-sectional area of the axial air inlet 12 to the cross-sectional area of the main air outlet 14 is set to be less than 1.65, so that the flow velocity of the air flow is kept at a high level, and in the first In the second working mode, there will be no uneven mixing with the low-speed airflow, which avoids airflow turbulence, ensures the length and cross-sectional area of the high-speed airflow from the axial air outlet, and further improves the blowing effect of the garden blower 100.
  • the main blowing pipe 11 is provided with a first card slot 112 and a second card groove 114 arranged at intervals along its axis direction
  • the auxiliary blowing pipe 13 is provided with a first card slot 112 and a first card The limiting portion 134 in which the slot 112 and the second card slot 114 fit.
  • the first card slot 112 is closer to the axial fan 50 and the motor 40 than the second card slot 114 .
  • the limiting portion 134 is snapped into the first card slot 112 , the main air outlet 14 is exposed, and the outside air flows from the shaft. Entering into the air inlet 12 and blowing out from the main air outlet 14, the garden blower is in the first working mode.
  • the main blowing pipe 11 is further provided with a guide rail (not shown in the figure) along the axis direction thereof, and the auxiliary blowing pipe 13 is slidably connected to the main blowing pipe 11 along the axial direction of the main blowing pipe 11 by means of the guide rail. Blowpipe 11.
  • the limiting portion 134 has a clamping end adapted to fit with the first clamping slot 112 and the second clamping slot 114 and a pressing end for pressing, and an elastic member 136 is also provided between the pressing end and the main blowing pipe 11 .
  • the snap end and the pressing end are configured to form both ends of the lever.
  • the nominal output voltage of the battery pack 60 is less than or equal to 20V
  • the capacity of the battery pack 60 is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is between 18000rpm and 35000rpm
  • the garden blower 100 is not connected.
  • the weight of the battery pack 60 is not more than 1.8kg, preferably not more than 1.5kg
  • the maximum wind speed of the garden blower 100 in the first working mode is between 90mph and 110mph
  • the maximum air volume of the garden blower 100 in the second working mode Between 350cfm and 500cfm, the working time of the battery pack is not less than 6min.
  • the nominal output voltage of a single battery pack 60 is 20V
  • the capacity of the battery pack 60 is 4Ah
  • the maximum speed of the motor 40 is between 20000rpm and 30000rpm
  • the weight of the hair dryer without the battery pack 60 is not more than 1.5kg.
  • the maximum wind speed of the hair dryer in the first working mode is between 90mph and 100mph
  • the maximum air volume in the second working mode is between 380cfm and 480cfm
  • the working time of the battery pack is not less than 10min.
  • the nominal output voltage of the battery pack 60 is greater than 20V and less than 56V
  • the capacity of the battery pack 60 is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is between 20000 and 38000rpm
  • the garden blower 100 is not connected.
  • the weight when powered on is not more than 2kg, preferably not more than 1.8kg
  • the maximum wind speed of the garden blower 100 in the first working mode is between 110mph and 180mph
  • the maximum air volume of the garden blower 100 in the second working mode is 420cfm ⁇ Between 650cfm, the working time of the battery pack is not less than 6min.
  • the garden hair dryer includes a first battery pack and a second battery pack for powering the motor 40, the nominal output voltage of the first battery pack and the second battery pack are both 20V, the capacity of the battery pack is 4Ah, and the hair dryer is not connected to
  • the weight of the battery pack does not exceed 1.8kg
  • the maximum rotational speed of the motor 40 is between 20000rpm and 38000rpm.
  • the maximum wind speed of the hair dryer in the first working mode is between 130mph and 165mph
  • the maximum air volume in the second working mode is between 480cfm and 630cfm
  • the working time of the battery pack is not less than 10min.
  • the quality of the garden blower 100 with similar performance is relatively heavy, while the garden blower in the embodiment of the present application effectively improves the user's use experience under the premise of satisfying the performance requirements of air volume and wind speed.
  • the overall length of the air duct portion 10 of the present application is shortened. In this way, the flow resistance of the airflow in the air duct portion 23 is reduced, and the whole machine can have a smaller volume.
  • the ratio of the length of the air duct 10 in the longitudinal direction to the length of the entire garden blower 100 in the longitudinal direction is less than or equal to 70%, and the maximum rotational speed of the motor is configured to be greater than or equal to 18,000 rpm and less than or equal to 40,000 rpm.
  • the ratio of the length of the air duct 10 in the longitudinal direction to the length of the entire garden blower 100 in the longitudinal direction is less than or equal to 65%, and the maximum rotational speed of the motor is configured to be greater than or equal to 18000rpm and less than 38000rpm.
  • the length of the whole machine is 850 mm to 1000 mm
  • the air duct portion 10 is linear
  • the length of the air duct portion 10 is not more than 600 mm. Therefore, the length of the air duct portion can be 600mm, 580mm, 560mm, 540mm, 520mm, 500mm, 480mm, 460mm, 440mm, etc.
  • the length of the air duct portion 10 is between 440mm and 560mm.
  • the nominal output voltage of a single battery pack is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor is between 18000rpm and 35000rpm
  • the length of the air duct is less than or equal to 600mm.
  • the length of the garden blower 100 is generally not less than 750mm, therefore, the length of the garden blower 100 can be 850mm, 880mm, 920mm, 950mm, 989mm.
  • the length of the air duct portion 10 is shortened to reduce the attenuation of the wind speed. Therefore, the length of the main blowing pipe 11 must be reduced.
  • the length of the main blowing pipe 11 can be configured to be no greater than 450mm.
  • the nominal output voltage of the battery pack is less than or equal to 20V, for example, the nominal output voltage of a single battery pack is no greater than 20V, a single battery pack
  • the capacity of the pack is 2Ah to 5Ah; the number of battery packs is 1, or the number of battery packs is 2, and the 2 battery packs are connected in series or in parallel.
  • the maximum rotational speed of the motor is between 18000rpm and 35000rpm, and the length of the main blowing pipe 11 is less than or equal to 400mm, specifically 350mm.
  • the nominal output voltage of the battery pack is greater than 20V and less than 56V, for example, the nominal output voltage of a single battery pack is greater than 20V, the capacity of a single battery pack is 4Ah, and the number of battery packs is 2, and the 2 battery packs are connected in series or connected in parallel.
  • the maximum rotational speed of the motor is between 20,000 rpm and 38,000 rpm, and the length of the main blowing pipe 11 is less than or equal to 420 mm, specifically 380 mm.
  • the length of the auxiliary blowing pipe 13 in the longitudinal direction is set between 100 and 160 mm.
  • the length of the auxiliary blowing pipe 13 is between 110 mm and 140 mm.
  • the garden hair dryer is integrally formed with a lever structure with the part held by the user as a fulcrum.
  • the element connected to the distal end of the extension rod 20 is positioned as the first weight unit (including the air inlet shroud 70, the motor 40, the axial flow fan 50, the flow guide structure 80 (including the guide cone 82, the stationary blade 54) and the outer casing surrounding these elements), the element attached to the proximal end of the extension rod 20 is defined as the second weight unit (operating handle 30 and battery pack 60).
  • Fig. 11 shows a schematic diagram of the positions of the center of gravity of the first weight unit, the center of gravity of the second weight unit, and the center of gravity of the whole machine in another embodiment of the present application
  • Fig. 12 shows another embodiment of the present application.
  • the battery pack 60 includes a first battery pack and a second battery pack mated with the battery pack mounting portion.
  • the nominal output voltage of the first battery pack and the second battery pack are both 20V
  • the capacity is 5Ah
  • the total weight of the first battery pack and the second battery pack is about 1.2-1.4kg.
  • the weight of the second weight unit is greater than the weight of the first weight unit, and the center of gravity of the whole machine is behind.
  • the ratio of the weight of the second weight unit to the total weight of the garden blower 100 with the battery pack 60 installed is not greater than 0.5.
  • the weight ratio of the second weight unit to the weight of the first weight unit does not exceed 2.5.
  • the weight ratio of the second weight unit to the first weight unit is not more than 2.3 and not less than 1.05.
  • the weight of the second weight unit is 1.96kg, and the weight of the second weight unit is 0.88kg.
  • the orthographic projection of the center of gravity of the garden blower combined with the battery pack 60 on a plane perpendicular to the rotation surface of the axial fan 50 is G′, and the control switch 34 is close to the front end of the extension rod 20
  • the orthographic projection on the plane perpendicular to the rotational surface of the axial flow fan 50 is K', and the orthographic projection G' is arranged within a range of 70 mm forward and backward from the orthographic projection K'.
  • the orthographic projection G' of the position of the center of gravity of the whole machine on the plane perpendicular to the rotating surface of the axial fan 50 is located 35mm forward of the projection K'.
  • the center of gravity G' of the garden blower is balanced (here, the center of gravity G' is understood as the projection of the center of gravity of the whole machine in the state where the battery pack is attached), and because in this embodiment
  • the garden hair dryer itself is low in weight, and in terms of weight, it has greatly reduced the user's fatigue in holding the machine.
  • the distance between the orthographic projection G' of the center of gravity M of the first weight unit on the plane perpendicular to the rotating surface of the axial fan 50 is L1, and the center of gravity J of the second weight unit is perpendicular to the rotating surface of the axial fan 50.
  • the distance between the orthographic projection on the plane and the orthographic projection G' is L2, and in the longitudinal extension direction of the extension rod 20, the distance L2 is within the range of 40% to 60% of the distance L1, and the length of the extension rod 20 exposed to the outside world
  • the configuration is within the range of 110-135mm, and the longitudinal length of the first weight unit is between 480mm-650mm.
  • the length of the extension rod 20 exposed to the outside world is the length of the extension rod 20 excluding the part combined with the air inlet shield 70 and the operating handle 30 .
  • the overall length of the air duct portion 10 connected to the distal end of the extension rod 20 is short.
  • the flow resistance of the airflow in the air duct portion 10 is reduced, and the maximum radial dimension of the air duct portion 10 can be shortened.
  • both the length and the maximum radial dimension of the air duct portion 10 are shortened, the volume of the air duct portion 10 is greatly reduced, thereby realizing the miniaturization of the whole machine.
  • the ratio of the longitudinal distance between the center of gravity of the garden blower 100 with the battery pack 60 installed and the foremost edge of the axial air outlet 12 and the longitudinal length of the garden blower 100 is not less than 0.75.
  • the ratio of the longitudinal distance between the center of gravity of the garden blower 100 with the battery pack 60 installed and the foremost edge of the axial air outlet 12 to the longitudinal length of the garden blower 100 is not less than 0.8.
  • the first battery pack and the second battery pack are arranged close to the operation handle 30 , and the projection of the center of gravity of the garden blower 100 equipped with the first battery pack and the second battery pack on the extension rod 20 is located on the side of the operation handle 30 .
  • the battery pack 60 is located below the operating handle 30 , and the projections of the battery pack mounting portion and the operating handle 30 on the extension rod 20 at least partially overlap.
  • the battery pack mounting portion is disposed near the proximal end of the extension rod 20
  • the number of battery packs for powering the motor 40 may be one
  • the nominal output voltage of the battery pack is less than or equal to 20V
  • the capacity of the battery pack is between 2Ah and 9Ah
  • the maximum speed of the motor 40 is between 18000rpm and 35000rpm.
  • the garden hair dryer weighs no more than 1.8kg without a battery pack
  • the maximum wind speed in the first working mode is between 90mph and 110mph
  • the maximum air volume in the second working mode is between 350cfm and 500cfm.
  • the working time of the package is not less than 8min.
  • the orthographic projection of the center of gravity of the garden blower combined with the battery pack on a plane perpendicular to the rotation surface of the axial flow fan 50 is G', and the control switch 34 is close to the front end of the extension rod at the axis
  • the orthographic projection on the plane perpendicular to the rotating surface of the flow fan is K'
  • the orthographic projection G' is configured to be within a distance of 100mm from the orthographic projection K' to the front and back.
  • the weight of the hair dryer without a battery pack is connected Not more than 1.5kg
  • the projection G' is configured to be within 50mm from the projection K' forward and backward.
  • the center of gravity G' of the hair dryer is balanced (here, the center of gravity G' is understood as the projection of the center of gravity of the whole machine when the battery pack is attached).
  • the weight itself is low, and in terms of weight, the user's fatigue in holding the machine has been greatly reduced.
  • the weight of the movement part is reduced to adjust the operation comfort of the whole machine, and on the other hand, the length of the extension rod 20 is reduced, and the movement is shortened. and the lever arm between the control switch 34.
  • the length of the exposed extension rod 20 is too short, the overall length of the air duct 10 connected to the extension rod 20 is bound to be long. The increase of the air duct 10 will affect the miniaturization of the whole machine. Longer, the greater the airflow loss, which affects the performance of the whole machine.
  • the distance between the projection of the center of gravity M of the first weight unit on the plane perpendicular to the rotating surface of the axial fan 50 and the projection G' is L1
  • the center of gravity of the second weight unit J is between
  • the distance between the projection on the plane perpendicular to the rotating surface of the axial flow fan 50 and the projection G' is L2.
  • the distance L2 is within the range of 60% to 80% of the distance L1.
  • the length of 20 exposed to the outside world is configured to be in the range of 100-140mm
  • the longitudinal length of the first weight unit is between 420mm-560mm.
  • the distance L1 and the distance L2 are the distances between the orthographic projections on the plane perpendicular to the rotating surface when the hair dryer is in a horizontal state.
  • the battery pack can be adapted to be connected to at least two different kinds of hand-held tools, such as lawn trimmers, chainsaws, lawn mowers, hair dryers, blow suction machines, electric drills, electric saws, pruning
  • the weight of the second weight unit is not more than 140% of the first weight unit and not less than 105% of the first weight unit.
  • the weight of the first weight unit is about 0.7kg
  • the weight of the second weight unit is about 0.94kg.
  • the axial air inlet 12 of a garden blower 100 in the prior art is arranged around the rearmost end of the garden blower 100 , and the operating handle 30 and/or the battery pack 60 are supported above the air duct 10 ,
  • the length of the air duct 10 in the longitudinal direction is substantially equal to the length of the garden blower 100 in the longitudinal direction, and the length of the garden blower 100 is generally between 800 and 900 mm;
  • another garden blower 100 in the prior art, the battery pack installation part Provided at the rear end (not shown) of the air duct portion 10 , the air duct portion 10 is formed with axial air inlets 12 at least at the side portion and the bottom portion for the outside air to flow into the air duct portion 10 .
  • the ratio of the length of the air duct part 10 to the length of the garden blower 100 in the longitudinal direction is not less than 3/4.
  • the above two garden blowers 100 cannot make the best use of the performance of the motor 40, and the wind volume and wind speed of the blower can also be taken into account.
  • the inventors of the present application found that the dimensions of the air inlet shroud 70 and the axial air inlet 12 of the air duct 10 affect and constrain the dimensions of the motor 40 and the axial flow fan 50 , and are closely related to the wind speed and air volume of the garden blower 100 , and the length and size of the air duct part 10 and the whole machine also affect whether the airflow can flow quickly, and finally feedback the wind speed and air volume of the garden blower 100 . Therefore, when the air volume and wind speed are predetermined values, the maximum height H and the maximum width W of the air inlet shroud 70 and the length L of the garden blower 100 also affect whether the performance of the motor 40 can be maximized.
  • the maximum height of the air inlet shroud 70 is H
  • the maximum width of the air inlet shroud 70 is W
  • the ratio of the maximum height H of the air inlet shroud 70 to the overall length L is less than 0.15
  • the inlet The ratio of the maximum width W of the wind shield 70 to the length L of the whole machine is less than 0.15
  • the air volume provided by the garden blower is greater than or equal to 350cfm and less than or equal to 650cfm
  • the provided wind speed is greater than or equal to 70mph and less than 185mph.
  • the maximum height H of the air inlet shield 70 is greater than 80 mm and less than 130 mm; the maximum width W of the air inlet shield 70 is greater than 80 mm and less than 130 mm; the overall length L of the garden blower It is between 850mm and 1000mm.
  • the nominal output voltage of the battery pack 60 is less than or equal to 20V
  • the capacity of the battery pack 60 is between 2 and 9 Ah
  • the maximum speed of the motor 40 is between 18,000 rpm and 35,000 rpm
  • the maximum height of the air inlet shield 70 is the same as that of the garden blower.
  • the ratio of the length of the whole machine is in the range of 0.09 to 0.133
  • the ratio of the maximum width of the air inlet shroud 70 to the whole length of the garden blower is in the range of 0.09 to 0.133
  • the maximum wind speed of the garden blower is in the range of 90mph to 110mph.
  • the maximum air volume of the garden blower is between 350cfm and 500cfm.
  • the nominal output voltage of the battery pack 60 is greater than 20V and less than or equal to 56V
  • the capacity of the battery pack 60 is between 2Ah and 9Ah
  • the rotational speed of the motor 40 is between 20000rpm and 38000rpm
  • the air inlet shield 70 The ratio of the maximum height of the hood to the whole length of the garden blower is in the range of 0.11 to 0.16, and the ratio of the maximum width of the air inlet guard 70 to the whole length of the garden blower is in the range of 0.11 to 0.16.
  • the wind speed is between 110mph and 160mph
  • the maximum air volume of garden blowing is between 420cfm and 650cfm. In this way, the performance of the motor 40 can be optimally utilized, and the air volume and air speed of the blower can reach optimal levels.
  • the above-mentioned garden blower 100, the motor 40, the axial flow fan 50, and the air guide structure 80 are arranged in the air duct portion 10, and are longitudinally separated from the operating handle 30 for holding a certain distance. , the length of the air duct portion 10 is shortened, and when the motor 40 drives the axial flow fan 50 to rotate at a high speed, the outside air can be quickly and sufficiently introduced into the air duct portion 10, the air flows in quickly, and the airflow loss is small and sufficient.
  • the air flow is fast and the wind pressure is large, which can reduce the radial size of the air duct 10 under the same wind speed and air volume, thereby optimizing the wind speed and volume of the garden blower 100, and also reducing the size of the garden blower 100.
  • the weight of the hair dryer 100 On the other hand, the garden blower 100 can be switched between the first working mode of high wind speed and the second working mode of large air volume by using the main blowing pipe 11 and the auxiliary blowing pipe 13 to cooperate with each other, which can meet the requirements of different working conditions for wind speed and air volume. Performance requirements that improve the performance experience of the Garden Hair Dryer 100.
  • the performance requirements of the garden blower 100 can be met.

Abstract

一种花园吹风机,进风护罩连接在轴向进风口上,且包括多个供气流通过的护罩孔,多个护罩孔的通风面积之和界定出进风护罩的有效通风总面积;延长杆沿纵向方向延伸,操作手柄和风道部借助于延长杆在纵向方向上彼此拉开;轴流风扇的叶片边缘的线速度大于80m/s,进风护罩的有效通风总面积小于12000mm 2,通过将进风护罩的有效通风总面积的限定,对电机参数化的合理配置,在能够达到低功耗的同时,还能满足直流电池包的续航时间,且保证风速和风量,从而获得较佳的吹风效率和吹风效果。

Description

花园吹风机 技术领域
本申请涉及电动工具领域,特别是涉及一种花园吹风机。
背景技术
随着城市绿化面积的不断扩大,公园、公路等公共场所的绿化带遍及全国各地,花园工具也被广泛应用。花园吹风机就是常见的一种花园工具,借助吹向地面的气流来清除灰尘或者杂物进行清洁。
一般地,花园吹风机的重量由使用者支撑,且当使用者握持机器进行清洁作业时,机器距离地面上异物的高度、机器与地面形成的夹角、机器左右摆动吹扫幅度均由使用者握持机器的方式确定。因此,降低花园吹风机的体积和重量,提升人机效果,一直是研发人员孜孜不倦研究的课题。
发明内容
基于此,有必要提供一种较小整体尺寸、较轻的整机重量且性能满足需求的花园吹风机。
为了实现上述目的,本申请提供的技术方案如下所述:
根据本申请的一个方面,提供一种花园吹风机,能够将散落的异物集中,所述花园吹风机包括:
风道部,包括与外界连通的轴向进风口;
电机,为所述花园吹风机提供驱动力;
轴流风扇,设置在所述风道部内;
进风护罩,连接在所述轴向进风口上,所述电机驱动所述轴流风扇能够绕风扇轴线旋转并将外界空气透过所述进风护罩从所述轴向进风口引入;所述进风护罩与所述轴向进风口连接,且包括多个供气流通过的护罩孔,多个所述护罩孔的通风面积之和界定出所述进风护罩的有效通风总面积;
操作手柄,用于使用者操作握持;以及
电池包安装部,用于与为所述电机供电的电池包可拆卸地连接,所述电池包安装部靠近所述操作手柄处设置;
延长杆,沿纵向方向延伸,所述操作手柄和所述风道部借助于所述延长杆在纵向方向上彼此拉开;
所述轴流风扇的叶片边缘的线速度大于80m/s,所述进风护罩的有效通风总面积小于12000mm 2
上述的花园吹风机,将电机的转速和体积、轴流风扇的直径,以及电机的功率与电池包的标称电压和容量综合考量和配置,从而可以将小体积、小直径、轻量化的设计最大化。与此同时,风道部轴向进风口的尺寸和进风护罩的有效通风总面积影响和约束着风量,同时也约束和影响着电机的尺寸和轴流风扇的尺寸,通过将进风护罩的有效通风总面积的限定,也奠定了“小”进风口和“细”风道部的格局。在能够达到低功耗的同时,还能满足直流电池包的续航时间,且保证风速和风量,从而获得更高的吹风效率和更好的吹风效果。
在一实施例中,所述进风护罩被构造为在所述轴流风扇的风扇轴线上纵向延伸;
所述进风护罩一端与所述轴向进风口连接,另一端支撑在所述延长杆上,所述轴流风扇转动能够形成转动面,所述进风护罩沿纵向落在所述转动面所在平面上的正投影的投影面积为S1;
所述延长杆连接所述进风护罩的一端沿纵向落在所述转动面所在平面上的正投影的投影面积S2;
其中,6≤S1/S2≤16。
在一实施例中,所述延长杆具有在纵向上彼此相对的第一端和第二端,所述延长杆通过所述第一端连接所述进风护罩,所述延长杆通过所述第二端连接所述操作手柄;
所述轴流风扇转动能够形成转动面,所述第一端沿所述延长杆的纵向延伸方向落在所述转动面所在平面上的正投影始终位于所述转动面的外轮廓边界之内,所述进风护罩的横截面积小于13300mm 2
在一实施例中,所述进风护罩设有在所述延长杆的延伸方向上延伸预设距 离的插接部,所述护罩孔周向分布在所述插接部的外围;
所述花园吹风机还包括第一连接结构,所述延长杆的所述第一端通过所述第一连接结构与所述进风罩的所述插接部进行锁定连接;
其中,沿所述延长杆的延伸方向,所述第一连接结构落在所述转动面所在平面上的正投影与所述护罩孔落在所述转动面所在平面上的正投影基本不重合。
在一实施例中,所述插接部被构造为中空的插接孔道,所述第一连接结构包括:
设置在所述插接孔道的内壁上的定位孔;及
设于所述延长杆上的定位件;
其中,所述定位件具有与所述定位孔的内壁形成卡接的锁定状态,以限制所述延长杆自所述插接部向后脱出。
在一实施例中,在所述锁定状态时,所述定位件的外轮廓在径向上向外超出所述定位孔内壁面的轮廓。
在一实施例中,所述定位件还具有保持其形状插入所述插接部内的自然状态,在所述自然状态时,所述定位件处于与所述定位孔相对应的预设位置;
且,所述定位件被构造为在承受外界作用力时能够改变其形状处于所述锁定状态。
在一实施例中,所述第一连接结构还包括设置在所述插接部的止挡部,所述止挡部能够与所述延长杆的所述第一端抵接以阻止所述延长杆自所述插接部向前移动。
在一实施例中,所述风道部包括主吹风管及与所述主吹风管连通设置的辅助吹风管,所述主吹风管设有所述轴向进风口和与所述轴向进风口对置的主吹风口,所述辅助吹风管具有与所述主吹风口连通的辅助进风口,在与所述纵向相垂直的方向上,所述辅助进风口的横截面积大于所述主吹风口的横截面积,所述主吹风口和所述辅助进风口之间具有供外部气流进入所述辅助吹风管内的间隙。
在一实施例中,所述花园吹风机能够通过所述辅助吹风管在相对较高的风 速和相对较低的风量排出空气的第一工作模式,与相对较低的风速和相对较高风量排出空气的第二工作模式之间切换;
所述辅助吹风管与主吹风管为活动连接,所述辅助吹风管能够沿纵向向后收拢或向前伸出,以使所述花园吹风机在第一工作模式和第二工作模式之间切换。
在一实施例中,所述电池包的标称输出电压小于或等于20V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在18000rpm~35000rpm之间,所述花园吹风机未连接有所述电池包时的重量不超过1.5kg,所述花园吹风机在第一工作模式下的最大风速在90mph~110mph之间,所述花园吹风机在第二工作模式下的最大风量在350cfm~500cfm之间;或者
所述电池包的标称输出电压大于20V,且小于56V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在20000rpm~38000rpm之间,所述花园吹风机未连接有所述电池包时的重量不超过1.8kg,所述花园吹风机在第一工作模式下的最大风速在110mph~180mph之间,所述花园吹风机在第二工作模式下的最大风量在420cfm~650cfm之间。
在一实施例中,所述风道部的长度不超过600mm。
在一实施例中,所述电池包的标称输出电压小于或等于20V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在18000rpm~35000rpm之间,所述电机的直径小于或等于40mm,所述轴向进风口与所述风扇轴线相垂直的横截面的最大有效通风面积小于9000mm 2,所述轴流风扇的外径大于或等于50mm,小于或等于67mm;或者
所述电池包的标称输出电压大于20V,且小于56V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在20000rpm~38000rpm之间,所述电机的直径小于或等于45mm,所述轴向进风口与所述风扇轴线相垂直的横截面的最大有效通风面积小于13000mm 2,所述轴流风扇的外径大于或等于50mm,小于或等于67mm。
在一实施例中,所述轴流风扇的叶片外边缘与所述风道部内壁之间设有缝隙;
所述缝隙在径向上的尺寸小于1mm。
在一实施例中,所述操作手柄的最高点到所述延长杆的最低点的直线距离小于140mm,大于40mm。
根据本申请的另一个方面,提供一种花园吹风机,能够将散落的异物集中,所述花园吹风机包括:
风道部,包括与外界连通的轴向进风口;
电机,为所述花园吹风机提供驱动力;
轴流风扇,设置在风道部内,所述电机驱动所述轴流风扇能够沿风扇轴线旋转并将外界空气从所述轴向进风口引入;
进风护罩,连接在所述轴向进风口上,所述电机驱动所述轴流风扇能够沿风扇轴线旋转并将外界空气透过所述进风护罩从所述轴向进风口引入;
操作手柄,用于使用者操作握持;以及
延长杆,沿纵向延伸,所述操作手柄与所述风道部借助于所述延长杆在纵向上彼此拉开;
其中,所述进风护罩的最大高度为H,所述整机长度为L;H:L的比值小于0.15;所述花园吹风机提供的风量为大于或等于350cfm,且小于或等于650cfm,所述花园吹风机提供的风速为大于或等于70mph,且小于185mph。
在一实施例中,所述进风护罩的最大宽度为W,其中W:L小于0.15。
在一实施例中,所述花园吹风机还包括电池包安装部,用于与为所述电机供电的电池包可拆卸的结合,所述电池包安装部靠近所述操作手柄处设置;
所述电池包的数量为一个,所述电池包的标称输出电压小于或等于20V,所述电机的最大转速在18000rpm~35000rpm之间,所述进风护罩的最大高度与所述花园吹风机的整机长度的比值范围在0.09~0.133之间,且所述进风护罩的最大宽度与所述花园吹风机的整机长度的比值范围在0.09~0.133之间,所述花园吹风机的最大风速在90mph~110mph之间,所述花园吹风的最大风量在350cfm~500cfm之间;或者
所述电池包的数量为两个,所述电池包的标称输出电压大于20V,且小于 56V,所述电机的最大转速在20000rpm~38000rpm之间,所述进风护罩的最大高度与所述花园吹风机的整机长度的比值范围在0.11~0.16之间,且所述进风护罩的最大高度与所述花园吹风机的整机长度的比值围在0.11~0.16之间,所述花园吹风机的最大风速在110mph~160mph之间,所述花园吹风的最大风量在420cfm~650cfm之间。
在一实施例中,所述花园吹风机的整机长度为850mm~1000mm之间;
所述进风护罩的最大高度为大于80mm,且小于130mm;所述进风护罩的最大宽度为大于80mm,且小于130mm。
在一实施例中,所述风道部的长度不超过600mm,所述花园吹风机的整机长度为大于或等于850mm,小于或等于1000mm;
所述花园吹风机的重量不超过1.8kg。
在一实施例中,所述风道部包括主吹风管及与所述主吹风管连通设置的辅助吹风管,所述主吹风管和所述辅助吹风管之间能够形成供外部气流进入所述辅助吹风管内的间隙,所述花园吹风机能够通过所述辅助吹风管在相对较高的风速和相对较低的风量排出空气的第一工作模式与相对较低的风速和相对较高风量排出空气的第二工作模式之间切换;
以所述风道部在纵向上的长度与所述花园吹风机整机在纵向上的长度之比小于等于70%,所述花园吹风机的重量不超过1.8kg,所述电机的最大转速配置在大于或等于18000rpm,且小于40000rpm。
附图说明
图1为现有技术中的花园吹风机的结构示意图;
图2为本申请一实施例中的花园吹风机处于第一工作状态下的结构示意图;
图3为图2所示的花园吹风机处于第二工作状态下的结构示意图;
图4为本申请一实施例中的花园吹风机处于第一工作状态下的剖面示意图;
图5为图4所示的花园吹风机处于第二工作状态下的剖面示意图;
图6为本申请一实施例中的花园吹风机的第一重量单元的重心、第二重量单元的重心和整机的重心位置分布示意图;
图7为本申请一实施例中的花园吹风机处于第一工作状态下的进风护罩位置的剖面示意图;
图8为图7所示的花园吹风机的进风护罩沿B-B方向的剖面示意图;
图9为本申请一实施例中的延长杆的定位件处于锁定状态时其与进风护罩的配合关系示意图;
图10为图9所示的延长杆的定位件处于自然状态时延长杆的结构示意图;
图11为本申请另一实施例中的花园吹风机的第一重量单元的重心、第二重量单元的重心和整机的重心的位置示意图;
图12为本申请又一实施例中的花园吹风机的第一重量单元的重心、第二重量单元的重心和整机的重心的位置示意图。
具体实施方式
为使本申请的上述目的、特征和优点能够更加明显易懂,下面结合附图对本申请的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本申请。但是本申请能够以很多不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本申请内涵的情况下做类似改进,因此本申请不受下面公开的具体实施例的限制。
在本申请的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中,“多个”的含义是至少两个,例如两个,三个等,除非另有明确具体的限定。
在本申请中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、 “固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系,除非另有明确的限定。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请中,第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方,或仅仅表示第一特征水平高度小于第二特征。
需要说明的是,当元件被称为“固定于”或“设置于”另一个元件,它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件,它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的,并不表示是唯一的实施方式。
相关现有技术中的吹风机,如图1所示,通常包括主机壳体1、涵道、产生气流的风扇、用于驱动风扇的电机和配接于主机壳体的吹风管2。电机、涵道、风扇均设置在主机壳体1内,吹风管2连接主机壳体,并与主机壳体连接形成气流通道。吹风管上设有出风口4,壳体上还设有进风口3,进风口3、电机、风扇、涵道、出风口4依次沿吹风机的纵向排列,涵道的作用是引导风扇产生的气流向吹风管的出风口移动,空气从进风口3进入壳体的内部,并从气流通道流动到出风口4吹出。主机壳体1上还设有供操作者握持的手柄5,电机设置于涵道之外,并位于手柄5的下方。
上述的花园吹风机的主要问题在于实现机器的小型化、轻量化和高工作性能上是相互矛盾的。具体而言,花园吹风机遇到的清洁工况主要有:家庭室外或者公园地面上的落叶和小型垃圾、地面砖缝之间的碎屑、黏附在地面上的湿树叶。发明人研究发现,为了能满足对上述工况的清洁要求,通常花园吹风机提供的风量和风速要足够大。但,功能部件的小型化、轻量化会减弱花园吹风机的工作效果,从而降低清洁能力,电池包的小型化和轻量化会缩短花园吹风 机的运行时间。例如,仅缩小主机壳体1、涵道、功能部件的体积、降低重量的同时,会影响和制约花园吹风机的工作效果。不缩小前述的部件的体积,通过改变材料降低重量,会影响整个器械的强度且提高了生产成本。
因此,小型化、轻量化和较佳的工作效果之间的相互矛盾、相互制约一直是制造者的痛点。
本申请的发明人继续研究发现,相关现有技术中,出现上述问题的原因在于,没有将诸如电机、风扇、风道结构等结构作合理的参数配置及结构优化。例如,比较突出的问题在于,没有将风扇结构和尺寸、电机的功率和转速以及风道结构,与吹风性能和功耗结合起来考虑设计,导致体积小和质量小的整机的风速、风量也较小,吹风效率低,难以吹起例如草坪上掉落的较重的树叶以及位于夹缝中的树叶。或者,体积和质量较大的整机的吹风效率虽然得到保证但噪音大、功耗太高,使用电池包进行供能时,吹风机能维持的工作时间较短,且人机体验不佳。
因此,有必要提供一种较小整体尺寸、较轻的整机重量且性能满足需求的花园吹风机。
图2示出了本申请一实施例中花园吹风机处于第一工作状态下的结构示意图;图3示出了图2所示的花园吹风机处于第二工作状态下的结构示意图。为了便于说明,仅示出了与本申请实施例相关的部分。
本申请实施例中的花园吹风机100,用于执行清洁工作,能够将散落的异物集中,这里的异物可以为树叶或垃圾。为便于理解,如图2和图3所示,将吹风口对应的气流流出的方向定义为前方(远端),例如,花园吹风机100的远端是指使用者在利用花园机进行清扫作业时,远离使用者的一端。相应地,将气流流进的一侧定义为后方(近端),例如,花园吹风机100的近端是指使用者在利用花园机进行清扫作业时,花园吹风机100靠近使用者的一端。花园吹风机100在近端(后方)和远端(前方)之间大致沿箭头A所示的方向纵向延伸。图纸的上方定义为上方,图纸的下方定义为下方。如图2所示,图纸向外定义为左侧,图纸向内定义为右侧;如图3所示,图纸向内定义为左侧,图纸向外定义为右侧。花园吹风机的高度是指花园吹风机沿上下方向的尺寸,花园吹风 机的宽度是指花园吹风机沿左右方向的尺寸。可以理解,上述定义仅为了说明,并不能理解为对本申请的限定。
本申请公开的至少一实施例中的花园吹风机100,包括壳体、电机40、风扇及电源。
参阅图2-图3,壳体包括大致沿纵向延伸的风道部10、供使用者握持的操作手柄30,以及沿纵向延伸预设距离的延长杆20。操作手柄30和风道部10借助延长杆20在纵向方向上彼此拉开。具体地到一些实施例中,风道部10包括与外界连通的轴向进风口12(见图4和图5),延长杆20被构造为纵向延伸在其近端和远端之间的管状结构,延长杆20包括位于后侧连接操作手柄30的手柄支撑段、位于前侧连接风道部10的风道支撑段,以及连接手柄支撑段和风道支撑段的中间段。风道部10的轴向进风口12和操作手柄30借助延长杆20的中间段在纵长方向上彼此拉开。
操作手柄30用于使用者操作握持,具有供操作者握持的所述握持部32,操作手柄30可以独立设置或与延长杆20一体成型。例如,一些实施例中,操作手柄30可以被构造为独立地支撑在延长杆20的近端;另一些实施例中,延长杆20的近端的至少部分可以形成所述操作手柄30。进一步地,风道部10沿第一轴线(图未示)纵长延伸,握持部32沿第二轴线(图未示)纵长延伸。第一轴线和第二轴线定义了第一平面(图2和图3中的竖向平面),第一平面与平行于第二轴线的第二平面(图2和图3中的水平平面)相垂直。操作手柄30在第二平面上的投影,与风道部10在第二平面上的投影在纵向上间隔且拉开一定距离。一些实施例中,第一轴线和第二轴线呈夹角设置,如此,当握持握持部32进行吹风操作时,通常握持部32的第二轴线大致平行于水平面,操作非常舒适,避免了长时间工作的疲劳。当然,在其他一些实施例中,第一轴线亦可以平行于第二轴线,如此有利于缩小花园吹风机100的尺寸和体积。另外,操作手柄30上还设有控制开关34(见图4和图5),控制开关34与电机40电连接,以控制电机40的开启和关闭,诚然,控制开关34还可以控制电机40的转速。
图4示出了本申请一实施例中的花园吹风机处于第一工作状态下的剖面示意图;图5示出了图4所示的花园吹风机处于第二工作状态下的剖面示意图。
参阅图4和图5,风道部10被构造为内部中空的管状体,风道部10相对的两端分别设有轴向进风口12和轴向出风口(图未标),可以理解,中空即是空气能够在轴向进风口12和轴向出风口之间顺畅流动。风道部10包括大致沿纵向延伸的主吹风管11,主吹风管11的数量可以有且仅有一个;当然,主吹风管11也可以为两段或者多段管体组合形成的一个具有完整吹风功能的吹风管。主吹风管11位于延长杆20远端,如此,风道部23整体长度可以缩短,气流在风道部10中流动阻力降低,整机可以具有较小的体积。
风扇设于风道部10内,电机40与风扇连接,用于驱动风扇转动,使得风扇绕一风扇轴线旋转,从而带动由轴向进风口12侧进入的空气形成向轴向出风口侧流动的气流,以为该花园吹风机提供驱动力。具体地,风扇为轴流风扇50,轴流风扇50相比于离心式风扇可以提供更佳的吹风效果,轴流风扇50可以由纤维复合材料结构体或者铝金属结构体或者镁金属结构体制造而成,轴流风扇50的风扇轴线与风道部10的中心线重合,轴流风扇50的叶片转动形成转动面,该转动面垂直轴流风扇50的风扇轴线和风道部10的中心线设置,如此有利于气流快速地流动。具体到实施例中,风道部10包括从轴向进风口12到轴流风扇50的上游区域,以及从轴流风扇50到轴向出风口的下游区域,上游区域的长度小于下游区域的长度。电机40设置于风道部10的上游区域,且与轴向进风口12在纵向上错位设置。电机40具有电机轴,电机轴与轴流风扇50连接并可驱动轴流风扇50围绕其风扇轴线旋转,从而带动空气从风道部10的上游区域向下游区域移动形成气流。当然,在其他一些实施例中,电机轴也可以通过传动机构连接轴流风扇50,在此不作限定,例如,传动机构可以为行星齿轮机构。
作为一种具体的实施方式,轴流风扇50包括与电机轴配接的轮毂52和多个安装在轮毂52上的叶片54,叶片54外边缘与风道部10的内壁之间设有缝隙,以避免叶片与风道部10的内壁干涉且形成高压、高速气流,较佳地,所述缝隙在径向上的尺寸小于1mm。进一步地,轴流风扇50还包括周向连接带,周向连接带环绕连接所有叶片54,周向连接带的设置,一方面可以增加轴流风扇50的刚度,延长轴流风扇50的使用寿命,防止使用一段时间后轴流风扇50出现破 损等现象;另一方面可以增加轴流风扇50高速转动后的稳定性,有助于降低轴流风扇50高速转动后产生的噪音。
电源用于为电机40提供电力,该电源可以为直流电源,具体可以为可充电的电池包60,电池包60以能够可拆卸地方式安装在壳体上。具体地,壳体上设有供电池包60结合的一个或者两个或者多个电池包安装部,该电池包安装部靠近操作手柄30处设置,电池包60的数量与电池包安装部的数量相匹配。应当理解的是,电池包安装部应靠近操作手柄30设置,可以实现重量单元尽可能的距离操作握持点最近,减少使用者工作的疲劳度。具体到一些实施例中,电池包安装部安装在或者一体形成在延长杆20的近端或靠近操作手柄30的位置设置。当电池包60与电池包安装部相连接,在纵向上,操作手柄30的最前端缘位于电池包60的最后端缘和轴向进风口12之间,且操作手柄30的最前端缘与轴向进风口12的最后端缘在纵向上间隔预设距离。这样的话,在电池包60连接至电池包安装部的状态下,位于后方的电池包60可以在纵向上平衡花园吹风机100重心的位置(这里的重心理解为配接有电池包60状态下的整机重心)。具体到如图6所示的实施例中,单个电池包60的标定电压为20V,G’为花园吹风机整机的重心,J为第一重量单元(电池包60与手柄30)的重心,M为花园吹风机的第二重量单元(机芯)的重心位置。如此,在纵向上平衡花园吹风机100重心的位置,使整机的重心尽可能的距离握持部32最近,减少使用者工作的疲劳度。
更具体地,如图2和图3所示,电池包60可以至少部分结构位于操作手柄30的下方,也可以均位于握持部32的后方。电池包60的插接方向可以与延长杆20和风道部10的轴线的延伸方向呈角度设置。优选地,该角度可以为30度~60度,更优选地,该角度可以为45度。其中,电池包60的数量可以为一个、两个或者多个,花园出风机根据具体的设计而选择不同类型和数量的电池包60。
本申请实施例中的电池包60至少能为两种不同种类的直流工具供电,例如可以通用于花园吹风机100、打草机、割草机、链锯、修枝机、角磨、电锤、电钻等电动工具。如此,使用者可以仅购买花园吹风机100的裸机,并通过利用已有的其它电动工具上的电池包60来为花园吹风机100进行供电,实现多工具 的能源共享,一方面,利于电池包60平台的通用;另一方面,也为使用者节省了购买成本。具体到实施例中,电池包60可采用卡扣方式或者插拔方式固定于电池包安装部上,例如,一些实施例中,电池包60包括于其两侧设有滑轨部(未标号)、于其上侧设有的卡扣部及若干电极连接片(未图示)。其中滑轨部可与电池包安装部配接实现电池包60在径向上被限位,卡扣部与壳体卡扣连接,实现电池包60在轴向上被限位,从而将电池包60稳定的连接在电池包安装部上。
参阅图4和图5,花园吹风机100还包括设置在风道部10内的导流结构80,导流结构80位于轴流风扇50的下游,用于引导气流移动。具体地,导流结构80包括导流锥82、收容导流锥82的外罩84以及位于导流锥82和外罩84之间的静叶片86。导流锥82大致沿气流的移动方向设置,导流锥82位于气流通道的中心,导流锥82包括外壳和设于外壳内部的锥形腔体。导流锥82的外壳与外罩84之间构成气流流通空间,该流通空间的垂直纵向轴线的横截面大致为环形。静叶片54位于该环形的流通空间内,并且大致间隔地分布。两两静叶片54之间的间隔供气流流通。具体到实施例中,静叶片54相对气流移动方向倾斜设置,并且倾斜的角度优选为5度~15度,静叶片54在径向方向上至少固定连接导流锥82与外罩84之一。作为一种较佳地实施方式,导流锥82的径向尺寸小于电机40的径向尺寸,相应地,导流锥82的体积小于电机40的体积,而外罩84收容于风道部10内,并与风道部10固定连接。
花园吹风机100还包括进风护罩70,进风护罩70与风道部10的轴向进风口12连接,电机40能驱动轴流风扇50绕风扇轴线转动以将外部的空气透过进风护罩70从轴向进风口12引入,进风护罩70至轴向出风口之间形成供空气流动的气流通道。其中,为了便于清理风道部10,进风护罩70与轴向进风口12可以被配置为可拆卸地连接。具体地,该进风护罩70被构造为在轴流风扇50的风扇轴线方向上延伸,且该进风护罩70一端与轴向进风口12连接,另一端支撑在延长杆20上。可以理解,进风护罩70的一个作用是防止用户的手指伸入到风道部10的内部,从而产生危险,另一个作用是防止例如树叶或杂物在清扫作业中进入风道部10从而造成电机40和轴流风扇50发生故障。具体到一些实施例中,进风护罩70包括多个供气流通过的护罩孔74(见图8),空气经由 该多个护罩孔74进入风道部的轴向进风口12,多个护罩孔74的通风面积之和界定出所述进风护罩的有效通风总面积。即,进风护罩的有效通风总面积可以理解为进风护罩70在与纵向相垂直的方向上的能够供气流流过的横截面积之和。另外,进风护罩70整体也并非平面设置,例如,如图4和图5所示的实施例中,进风护罩70形成一沿纵向延伸呈圆弧形的弧形进风面。作为一种具体的实施方式,护罩孔74的最大孔径不大于7mm,优选地,护罩孔74的最大孔径不大于4mm。如此,可以对人体起到防护作用的同时,还可以防止杂物进入轴向进风口12。
需要强调的是,本申请的实施例中,电机40、轴流风扇50、导流结构80设置于风道部10内,与用于握持的操作手柄30在纵向上拉开一定距离,如此,一方面,在花园吹风机100长度一定的前提下,风道部10的长度变短,在电机40带动轴流风扇50高速旋转时,外界的空气能够被快速的、足够的引入至风道部10内,空气快速的流入,气流损失小且足够量的气流在电机40的驱动下,快速流动,风压大。缩小风道部10的径向尺寸,从而优化了花园吹风机100的性能和体积,进而也降低了花园吹风机100的重量。另一方面,含有机芯的风道部10与操作手柄30拉开距离,还缩小了花园吹风机100的高度尺寸,使整机的体积和重量均减小。
可以理解,花园吹风机100的性能主要取决于产品的风量和风速,而产品的风量和风速主要由轴流风扇50的吹风效果以及风道的结构决定。其中,轴流风扇50的吹风效果主要由轴流风扇50的风量和风压决定,以轴流风扇50为例,轴流风扇50的风量用符号Q 表示,主要用下面的公式表示:Q =Q’×π/4×D 2×V;其中,Q’:流量系数,与吹风机轴流风扇50的形式有关;D:轴流风扇50的外径;V:轴流风扇50外周的圆周速度(叶片边缘的线速度)。因此,在同样的轴流风扇50形式下(即Q’一定),且保持轴流风扇50的风量不变,轴流风扇50的叶片边缘的线速度V与轴流风扇的直径D呈反比关系。
轴流风扇50的风压为轴流风扇50的出风侧气流全压与进风侧气流全压之差称为风压,用符号H表示。主要用下面的公式表示:H=ρ×h×D 2×N  2;ρ:空气的密度;h:压力系数,一般与轴流风扇50的形式有关;D:轴流风扇50的 外径;N:轴流风扇50的转速。因此,在同样的轴流风扇50形式下,且保持同样的风压,轴流风扇50的转速与轴流风扇50的直径大致呈反比关系。
本申请的发明人经过分析获知,如果将电机40转速、扇叶角度设定为定量,在相同的风道结构下,轴流风扇50直径越大,可以获得更高的风量和风速,但同时带来的后果是,吹风机的功耗会更高,在使用电池包60作为电源时,吹风机的工作时长受到限制。因此,为降低吹风机的功耗,将轴流风扇50的直径趋于减小,随着轴流风扇50的直径的减小,花园吹风机100的功耗在逐渐减小,但同时带来的后果是,吹风机的风量和风速也总体呈现出逐渐减小的趋势。因此,在考虑功耗的同时,兼顾吹风机的吹风效果,轴流风扇50直径、电机40转速和风道结构需要进行合理的参数配置,即期望合理的参数配置,使风速、风量能够满足性能需求,但功耗处于可控范围内,且相较于现有技术中的花园吹风机100降低了体积和质量。与此同时,在同样的轴流风扇50形式下,保持同样的风压,轴流风扇50的转速与轴流风扇50的直径D大致呈反比关系,也就是说,保持期望的风量和风压的前提下,缩小轴流风扇50的直径,则需要提高轴流风扇50的转速,轴流风扇50的转速主要由电机40决定,因此,为了将小体积、小直径、轻量化的设计最大化,采用越高转速的电机40,轴流风扇50的直径理论上可以越小。所以,大输出功率、小体积、小直径、高转速的电机40本身可以实现花园吹风机100的轻量化,且由电机40带动的轴流风扇50的尺寸也可以有明显减小,轴流风扇50的重量也降低,相对应的围绕在轴流风扇50外围的风道部10也可以设计的比市面上现有的花园吹风机100的尺寸和重量都小。但是,随之而来带来的后果是,电机40的转速越高,则意味着电机40的最大输出功率越大,还需要考虑电池包60的标称电压和容量,以保证花园吹风机100的工作时长。
基于前述的分析可知,扇叶角度设定为定量,轴流风扇50的叶片边缘的线速度V分别与轴流风扇50的转速V和轴流风扇50的直径D正相关。本申请的实施例中,将轴流风扇的叶片边缘的线速度限定大于80m/s,进风护罩的有效通风总面积限定为小于12000mm 2。优选地,轴流风扇的叶片边缘的线速度大于83m/s,进风护罩的有效通风面积小于9000mm 2
如此,将电机40的转速和体积、轴流风扇50的直径,以及电机40的功率与电池包60的标称电压和容量综合考量和配置,从而可以将小体积、小直径、轻量化的设计最大化。与此同时,风道部10轴向进风口12的尺寸和进风护罩70的有效通风总面积影响和约束着风量,同时也约束和影响着电机40的尺寸和轴流风扇50的尺寸,通过将进风护罩的有效通风总面积的限定,也奠定了“小”进风口和“细”风道部的格局。在能够达到低功耗的同时,还能满足直流电池包60的续航时间,且保证风速和风量,从而获得更高的吹风效率和更好的吹风效果。
具体到实施例中,花园吹风机100的电机40、轴流风扇50、导流结构80均设于风道部10内,电机40设于风道部10的轴向进风口12和轴流风扇50之间的上游区域。为使电机40具有高转速和小体积,电机40的直径不高于45mm,通常为36mm~45mm,且电机40与风道部10的内壁之间还需要保持一定间隙,以提供足够的进气量。
示例地,电机40可以采用外转子无刷电机40,其可以实现高转速的同时,且具有较小的直径和体积。外转子无刷电机40的最大转速配置为大于18000rpm,且小于40000rpm,例如,电机40的最大转速可以为18000rpm、25000rpm、27000rpm、29000rpm、32000rpm、35000rpm、38000rpm。该电机40的直径不高于45mm。优选地,可以配置在36~45mm之间。因此,该电机40的直径可以设置为36mm、37mm、38mm、39mm、40mm、41mm、42mm、43mm、44mm。
进一步地,作为优选地实施方式,电机40的垂直纵向的横截面积与风道部10的轴向进风口12的横截面积之比小于0.5。风道部10的轴向进风口12的直径为大于50mm,小于130mm,例如,风道部10的轴向进风口12的直径可以为50mm、55mm、65mm、70mm、80mm、85mm、93mm、100mm、110mm、120mm。
进一步地,由于电机40位于风道部10的上游区域,电机40占据一定的空间和体积,空气沿风道部10内移动,风道部10的上游区域包括若干个过风面。过风面为风道部10的上游区域垂直于气流移动方向的截面。为了保证足够的进 风量,上游区域中最小的过风面的面积大于轴流风扇50的叶片54转动形成的转动面的面积,这样可以保证源源不断的空气补充接触到轴流风扇50的叶片54,从而保证吹风不间断。类似于木桶理论,上游区域补充给轴流风扇50的空气量的大小取决于上游区域中最小的过风面积。因此即使上游区域的其他地方的过风面积再大,但是其中最小的过风面面积仍然不变化的话,轴流风扇50的进风量就不会变化。因此,提升整个上游区域的最小过风面积才能提升轴流风扇50的进风量。从图4和图5来看,空气从轴向进风口12进入到上游区域后,由于上游区域靠近轴向进风口12的部分没有阻挡,因此该部分的过风面积可以保证大于轴流风扇50的转动面积。上游区域中环绕电机40的部分定义为环绕区域,由于有电机40的阻挡,环绕区域的过风面积会比较小。但是为了保证良好的吹风效率,环绕区域的沿纵向的过风面积中的最小面积设计为大于轴流风扇50的叶片54转动形成的转动面的面积。
为兼顾电机40的转速和吹风机的功耗,本申请的一些实施例中,针对不同的电源,将电机40的输出功率设置为不同。例如,电池包60的标称输出电压小于等于20V,电机40的最大输出功率为280~400W;电池包60的标称输出电压大于20V,小于56V,电机40的最大输出功率为500~1100W。如此,不仅考虑了电机40的功率、转速,还兼顾了吹风机的功耗和电池包60的标称电压和容量,保证了花园吹风机100的工作时长和工作效率。在此最大输出功率范围内,该电机40的重量在0.1~0.3kg范围内。因此,该电机40的重量可以设置为0.15kg、0.25kg、0.26kg、0.27kg、0.28kg、0.29kg。
进一步的,针对不同类型和数量的电池包60,为达到更佳的吹风性能和吹风效率,进一步将高转速加小轴流风扇50的机芯的作用最大化,本申请的发明人研究发现,针对电机40的转速、直径、轴向进风口12的横截面积以及轴流风扇50的直径可以进一步进行优化和参数化配置。一些实施例中,电池包60的标称输出电压小于或等于20V,电池包的容量在2Ah~9Ah之间,电机40的最大转速在18000rpm~35000rpm之间,电机40的直径小于或等于40mm,电池包的工作时长不小于6min,轴向进风口12的有效通风面积小于9000mm 2,轴流风扇50的外径大于或等于50mm,小于等于67mm。因此轴向进风口12的 有效通风面积可以为8500mm 2、7500mm 2、7000mm 2等。
作为一种优选地实施方式,电池包60的标称输出电压小于或等于20V,电池包的容量在2Ah~9Ah之间,电机40的最大转速为27000rpm,电池包的工作时长大于等于8min,电机40的直径小于或等于40mm,轴向进风口12的直径为80mm~100mm,轴向进风口的有效通风面积小于6500mm 2,轴流风扇50的直径为59mm。
另一些实施例中,当电池包60的标称输出电压大于20V,且小于56V,电池包60的容量在2Ah~9Ah,电机40的最大转速在20000~38000rpm之间,电池包的工作时长不小于6min,电机40的直径小于等于45mm,轴向进风口12的有效通风面积小于13000mm 2,轴流风扇50的外径大于等于50mm,小于等于67mm。因此轴向进风口12的有效通风面积可以为9200mm 2、9800mm 2、11000mm 2等。作为一种优选地实施方式,电池包60的标称输出电压大于20V,且小于56V,电池包60的容量在2Ah~9Ah,电机40的最大转速为32000rpm,电机40的直径小于或等于45mm,轴向进风口12的直径为100mm~120mm,电池包的工作时长大于等于10min,轴向进风口的有效通风面积小于8000mm 2,轴流风扇50的直径为60mm。
这样,在形成高转速电机40加小轴流风扇50的布局下,花园吹风机100的电机40、轴流风扇50和风道部10的尺寸更小,相较于现有技术使花园吹风机100的体积更为小巧和整机的重量轻量化,提高了使用体验。
本申请的一些实施例中,延长杆20具有在纵向上彼此相对的第一端和第二端,该第一端和第二端可以是沿延长杆20的纵向延伸方向上相对的两端。其中,第一端可以为延长杆20的远端,第二端可以为延长杆20的近端。延长杆20能够通过第一端连接进风护罩70,通过第二端连接操作手柄30。延长杆20通过第一端与进风护罩70相连时,该第一端沿延长杆20的纵向延伸方向落在轴流风扇转动形成的转动面上的正投影始终位于轴流风扇50的转动面的外轮廓边界之内。可以理解,由于轴流风扇50安装在风道部10内,从而延长杆20与风道部10不会在径向上产生尺寸叠加,花园吹风机的整机形状规则,结构紧凑。
示例地,操作手柄30的握持部32沿第二轴线纵长延伸,延长杆20和风道 部10沿第一轴线纵长延伸,第一轴线平行于第二轴线。因此,操作手柄30的最高点与延长杆20的最低点之间的距离,即握持部32的上侧和延长杆20的下侧之间的距离可以为大于40mm,小于140mm。作为一种优选地实施方式,该直线距离大于128mm,小于135mm;更优选地,操作手柄30的最高点到延长杆20的最低点的直线距离为130mm。当连接于电池包60后的花园吹风机100的最高点与最低点的距离可以为150mm~170mm,优选为159mm,而例如如图1所示的传统的花园风吹机连接有电池包60后的最高点至最低点的距离达到了260~270mm。
应当理解的是,由于延长杆20连接在进风护罩70的外轮廓的边界范围内,不可避免的占据了进风护罩70的部分进风面积。在一定程度上影响了进风护罩70的进风量。为使进风护罩70与延长杆20之间形成的进风通道径向上的截面面积应当处于合理的范围内,以保证花园吹风机的进风量的同时,使空气气流可以稳定地进入并流经风扇区域形成高速、高压气流,有效地保证花园吹风机的性能。一些实施例中,该进风护罩70被构造为在轴流风扇50的风扇轴线上延伸,该轴流风扇50转动形成转动面,进风护罩70沿纵向落在所述转动面所在平面上的正投影的投影面积为S1,延长杆连接进风护罩70的一端沿纵向落在转动面所在平面上的正投影的投影面积S2。其中,S1和S2的比率大于等于6,且小于等于16。优选地,8≤S1/S2≤12。如此,可以最大程度的保证进风的需求,防止延长杆20与轴向进风口12连接的第一端的端面面积过大影响进风量。具体到一个实施例中,延长杆20连接于轴向进风口12的第一端在垂直纵向方向上的横截面积不大于1256mm 2,不小于314mm 2。作为一种优选地实施方式,该延长杆20连接轴向进风口12的第一端在垂直纵向方向上的横截面积不大于920mm 2,不小于616mm 2。特别强调的是,延长杆20垂直纵向方向上横截面积过大,势必会影响进风量以及整机轻量化,而横截面积过小,由于需要依靠延长杆20前后支撑风道部10和电池包60,延长杆20的可靠性会降低。因此,将延长杆20连接于轴向进风口12的一端在垂直纵向方向上的横截面积设置在前述的特定范围内,可以在兼顾整机轻量化和可靠性的同时,保证花园吹风机的进风量和性能。
进一步地,由于花园吹风机基本是通过使用者手持机器作业,对于手持式器械,使用者长时间握持作业会出现手臂疲劳,尤其对于单手操作的手持式器械。因此,在实现基本差不多的性能下,整机能够在体积和重量上进行实质性的压缩,一直是亟待解决的难题。在前述的实施例中,通过巧妙的短风道部10设计,且叠加风道部10后截面尺寸也降低,从而在纵向尺寸和径向尺寸均缩短的情况下,整机在体积和重量上有了显著性的改变。需要指出,进风护罩70一端连接轴向进风口12,另一端支撑在延长杆20上,因此,进风护罩70会影响整机的径向尺寸,其中,进风护罩70一端与风道部10的轴向进风口12连接,因此风道部10的横截面尺寸降低,进风护罩70的横截面尺寸也必然降低,有利于降低整机的尺寸。具体到一些实施例中,在垂直纵向方向的方向,进风护罩70连接轴向进风口12的一端的横截面积小于为13300mm 2,优选地,在垂直纵向方向的方向,进风护罩70连接轴向进风口12的一端的横截面积不小于3800mm 2,不大于11300mm 2
具体到一个实施例中,进风护罩70呈近似圆弧形,直径为110mm,延长杆20在径向上的截面面积为907mm 2,即进风护罩70沿纵向落在转动面所在平面上的正投影的投影面积S1,与延长杆20连接进风护罩70的一端沿纵向落在转动面所在平面上的正投影的投影面积S2之间的比值约为10.47。进一步地,该进风护罩70在轴流风扇50的风扇轴线上的延伸距离不小于62mm。如此,进一步地保证花园吹风机的进风量,从而可以满足花园吹风机的性能要求。
图7示出了本申请一实施例中的花园吹风机处于第一工作状态下的进风护罩位置的剖面示意图;图8示出了图7所示的花园吹风机的进风护罩沿B-B方向的剖面示意图。
针对“细”风道的布局,需要考虑进风护罩70与延长杆20的连接固定结构也尽量不要遮挡进风,进一步减少进风量的损失。在一些实施例中,参阅图7-图8,进风护罩70设有在纵向延伸预设距离的插接部72,护罩孔74周向分布在插接部的外围,花园吹风机还包括第一连接结构(图未标),延长杆20的第一端通过第一连接结构实现与进风护罩70的插接部72连接。其中,第一连接结构沿延长杆20的延伸方向落在轴流风扇50转动面所在平面上的正投影与护 罩孔74沿延长杆20的延伸方向落在转动面所在平面上的正投影基本不重合。整体上,该第一连接结构位于进风护罩70的内圈,护罩孔74位于插接部70的外围,两者互不干涉,互不遮挡,从而进风护罩70在与延长杆20配接时,第一连接结构不会占据护罩孔74的面积,从而不会影响进风量。具体到如图8所示的实施例中,该插接部72沿着与延长杆20的纵长延伸方向相垂直的方向上的截面为椭圆形,在其他一些实施例中,还可以是圆形或者是方形,在此不作限定。
需要说明的是,第一连接结构沿延长杆20的延伸方向落在轴流风扇50转动面所在平面上的正投影与护罩孔74沿延长杆20的延伸方向落在转动面所在平面上的正投影基本不重合。此处的基本不重合是指,第一连接结构在转动面所在平面上的投影与护罩孔74在转动面所在平面上的投影相离、相切或者相交的最大直线尺寸在5mm范围内。进一步而言,以打螺钉的固定方式为例,螺钉从进风护罩70外边缘插入连接至延长杆20上的固定方式,这种方式螺钉在径向上占据了很大尺寸,使第一连接结构在转动面所在平面上的投影与护罩孔74在转动面所在平面上的投影相交的最大直线尺寸大于5mm。如此牺牲掉了部分进风面积,且安装步骤更复杂。因此,打螺钉的固定方式中,第一连接结构沿延长杆20的延伸方向落在轴流风扇50转动面所在平面上的正投影与护罩孔74沿延长杆20的延伸方向落在转动面所在平面上的正投影不属于前述限定的“基本不重合”的情况内。
一些实施例中,插接部72被构造为中空的插接孔道,延长杆20的第一端插接锁定至该插接部72内,以实现两者锁定连接。在另一些实施例中,进风护罩70上的插接部72也可以被构造为插入锁定在延长杆20的第一端的内腔里。应当理解的是,延长杆20的第一端与插接部72彼此包覆且沿纵向方向延伸一端距离,使得延长杆20与进风护罩70的接合面积增大,从而可以提高延长杆20与进风护罩70之间的连接强度。例如,在插接部72被构造为中空的插接孔道的实施例中,由于插接部72在纵向方向内具有一定的延伸长度,从而可以沿延长杆20的周向将延长杆20包裹住,使得延长杆20与进风护罩70的连接强度和稳定性更佳。
图9示出了本申请一实施例中的延长杆的定位件处于锁定状态时其与进风护罩的配合关系示意图;图10示出图9所示的延长杆的定位件处于自然状态时延长杆的结构示意图。
一些实施例中,如9-图10所示,第一连接结构包括设置于延长杆20上的配合件以及设置于插接孔道上的锁定件。其中,锁定件可以限定为在插接部的内壁上的定位孔76,配合件可以为靠近延长杆20第一端的外壁设置或者设置于延长杆20第一端的形状可调的定位件22。该定位件22具有与定位孔76的内壁形成卡接的锁定状态,在锁定状态时,该定位件22的外轮廓在径向外超出定位孔76内壁面的外轮廓,以限制延长杆20自插接孔道向后脱出。具体到一些实施例中,该定位件22具有保持其形状插入至插接孔道内的自然状态(见图10),和在承受外界作用力时改变其形状的锁定状态(见图9)。在自然状态时,定位件22处于与定位孔76相对应的预设位置,在锁定状态下,定位件22的外轮廓在径向上超出定位孔76内壁面的外轮廓,以限制延长杆20从插接孔道向后脱出。
具体地,插接部72的内壁设置有多个定位孔76,多个定位孔76在插接部72的周向上间隔分布。定位件22形状可调,其可以是硬性结构,也可以是具有弹性的结构。具体到一个实施例中,当定位件22是硬性结构,例如铝板,从自然状态切换至锁定状态,需要操作者利用辅助件,将定位件22向外顶出,使得定位件22改变形状,向外撑开。当定位件22是弹性结构,在自然状态切换至锁定状态,定位件22释放蓄积的弹性势能,使得定位件22改变形状,向外撑开。
需要强调的是,进风护罩70和延长杆20连接后,该第一连接结构整体位于进风护罩70的内部,通过将第一连接结构整体容纳于进风护罩70内,保证第一连接结构的稳定性。在延长杆20与进风护罩70接合时,通过延长杆20的定位件22在定位孔76中从自然状态向锁定状态转换,以限制延长杆20从插接孔道中脱出。
另一些实施例中,配合件也可以限定为自延长杆20壁面凹陷的开槽,该开槽可以为内外贯通的开孔,也可以是半封闭状的凹槽,锁定件可以限定为自插 接部22的内壁面或者插接部72的末端缘向内凸伸的凸起部,该凸起部可以为卡扣,当插接部72插入耦合至延长杆20的内腔,进风护罩70和延长杆20可以通过上述开槽与凸起部形成锁定配合。
在一些实施例中,插接部72具有用于插设延长杆20的开口端,开口端可以向内颈缩形成颈缩结构,开口端的最大外轮廓尺寸大于延长杆20在定位件22处的最大外轮廓尺寸。具体地,延长杆20的第一端在与插接部72接合时,可以较为容易的插入插接部72内,无需使用较大的外力将延长杆20的第一端接入插接部72中。
在一些实施例中,如图9所示,第一连接结构还包括设置在插接部72末端的止挡部78,该止挡部78能够与延长杆20的末端抵接以阻止延长杆20自插接部72的插接孔道向前移动。具体地,止挡部78为向插接孔道凸出的止挡块。定位件22在锁定状态时,延长杆20的第一端与止挡部78相抵,延长杆20的第一端限位于定位孔76与止挡部78之间,以防止延长杆20在插接孔道的轴向上蹿动。延长杆20的定位件22在与定位孔76卡接时,延长杆20的第一端同时能够顶抵止挡部78,实现轴向定位。
在一些实施例中,如图10所示,延长杆20在靠近第一端的外壁上设置有孔槽26,孔槽26与第一端的端缘之间能够形成所述定位件22,孔槽26与第一端的端缘之间的距离被配置为等于定位孔76与止挡部78之间的距离。在本实施例中定位件22可以采用冲压成型的方式形成于延长杆20上,制作方法比较简单,并且无需采用其他材料,成本更低。
可以理解,延长杆20不仅起到连接操作手柄30和风道部10的作用,还用于起到支撑作用。因此,延长杆20的支撑材料需要具有一定的强度。在一些优选地实施例中,延长杆20为铝管材质,不仅具有一定的支撑强度,采用铝管材质制作的支撑件更加轻便,便携性较好,优选地,延长杆20的壁厚为1~2mm,具有较小的体积。
一方面,由于延长杆20第一端占据了进风护罩70的有效通风面积,从而使得进风护罩70牺牲掉一部分的进风面积。另一方面,由于“细”风道的布局,势必会对吹风机的进风量有较大影响。为了弥补上述结构设计产生的损失,可 由延长杆20来输送辅助气流。具体的,如图9和图10所示,延长杆20大致可呈中空的管状结构,具有辅助风道(图未标)、与辅助风道相连通的气流入口和气流出口24。气流出口24与风道部10相连通,气流入口与外部气流相连通,并通过辅助风道形成辅助气流,该辅助气流与由护罩孔74进入的主气流在轴流风扇处汇聚。
在一些实施例中,气流出口24可靠近第一端设置,例如可设在第一端下部,或者直接设置于第一端端部,即第一端为敞口,用于连通辅助风道与风道部10,使得辅助风道中的气流能经过气流出口24进入到风道部10中。气流入口可以靠近第二端设置,并位于延长杆10置于操作手柄的外部部分,或者气流入口靠近第二端设置,并位于延长杆20置于操作手柄30的内部部分,或者气流入口设置在第二端的端部,即第二端为敞口。具体到实施例中,当气流入口位于第二端的端部或者位于延长杆20上置于操作手柄30的内部部分,为了将外部气流引入延长杆20的辅助风道中,操作手柄30上可以开设有与气流入口相连通的次进风口36(见图7),次进风口36用于连通外界气流、辅助风道。电机40在运行时会在延长杆20的第一端附近产生负压区,从而可将外界的空气经过气流入口抽吸进入到延长杆20的辅助风道中,在延长杆20内形成有辅助气流。
进一步地,为了保证花园吹风机达到一定的吹力,满足性能的要求,且花园吹风机的径向尺寸更小,整机更紧凑,即需要对花园吹风机的风速进行提升。本申请的主吹风管11的主吹风口14在与纵向相垂直方向上的截面积较小,能够对流进的气流进行增压,形成较高风速,例如,主吹风管11的主吹出风口14在与纵向相垂直方向上的横截面积小于4000mm 2。但是,由于主吹风管11的径向尺寸较小,轴向进风口12、主吹出风口14均会对风量产生限制,为了补偿进风量,一些实施例中,风道部10包括主吹风管11及与主吹风管11连通设置的辅助吹风管13。主吹风管11和辅助吹风管13之间能够形成供外部气流进入辅助吹风管内13的间隙。
一些实施例中,该花园吹风机能够通过辅助吹风管13在相对较高的风速和相对较低的风量排出空气的第一工作模式与相对较低的风速和相对较高风量排出空气的第二工作模式之间切换。具体地,主吹风管11与辅助吹风管13流体 连通,主吹风管11支撑在延长杆20的远端,主吹风管11与辅助吹风管13之间具有前述的间隙,使得外部空气能够通过所述间隙进入至辅助吹风管13内,从而增加花园吹风机100的风量。主吹风管11的近端设有所述轴向进风口12,主吹风管11远端设有与轴向进风口12对置的主吹风口14(见图4),辅助吹风管13具有与主吹风口14连通的辅助进风口及在纵向上位于辅助进风口远端的管口,所述管口形成出风口。辅助进风口至少包围部分主吹风口14,辅助吹风管13的出风口在与纵向相垂直方向上的横截面积大于主吹风口14的横截面积,且辅助进风口的内圈和主吹风口14的外圈之间形成上述供外部空气能够流入至辅助吹风管13内的所述间隙。通过辅助吹风管13的设置,在花园吹风机100具有高风速的情况下,还能使得花园吹风机100的吹风量满足需求。
进一步地,辅助吹风管13与主吹风管11为活动连接,以使花园吹风机在第一工作模式和第二工作模式之间切换。需要说明,该活动连接可以理解为,辅助吹风管13能够可拆卸地与主吹风管11相脱离,且辅助吹风管13能够向后收拢预设距离或向前伸出,以使花园吹风机100在第一工作模式和第二工作模式之间切换。具体地,花园吹风机100处于第一工作模式,外界空气自轴向进风口12进入,并由主吹风口14向外吹出;花园吹风机100处于第二工作模式,外界空气自轴向进风口12进入,并由辅助吹风管13的管口向外吹出的第二工作模式,使用者可根据清洁需求自由的选择第一工作模式工作或者第二工作模式工作,使用者可根据不同的工况,选择相匹配的模式进行工作。示例地,需要清扫所布满落叶的庭院、公园、街道等场所时,使用者可以选择风量相对较大,风速相对较小的第二工作模式,以在单位时间内快将清扫区域的落叶聚拢在一起;需要清扫黏附在地面上的湿树叶,使用者可以选择风量相对较小,风速相对较大的第一工作模式,以足够的力量将异物与地面快速剥离。
需要说明的是,在花园吹风机处于第一工作模式下,花园吹风机100的轴向出风口为主吹风管11的主吹风口14。在花园吹风机处于第二工作模式下,花园吹风机100的轴向出风口为辅助吹风管的出风口。
为了最大化的增加通过所述间隙流入至辅助吹风管13内的气流量,辅助进风口为外扩的喇叭形,且辅助进风口在与纵向相垂直的方向上的横截面积大于 其出风口的横截面积。由于辅助进风口的横截面积增大,流入至辅助吹风管13内的气流在辅助进风口前端的风速自然降低。一些实施例中,将辅助吹风管13配置成台锥状,以压缩进入至辅助吹风管13内的气流,再一次提升风速。另,考虑辅助吹风管13的出风口的横截面积不能配置的太小,过小尺寸的出风口,会影响风量,具体地,辅助吹风管13的出风口在与纵向相垂直的方向上的横截面积与主吹风口14的横截面积的比值在2~3.5之间。具体到实施例中,辅助吹风管13的外壁与风扇轴线形成的夹角约为3度~9度。以达到不影响风量的同时能够提升辅助吹风管13内的风压。
还应当理解的是,由轴向进风口12进入风道部10内的空气在轴流风扇50的旋转下,汇聚成高速移动的气流,自轴向进风口12向主吹风口14扩散。自轴向进风口12向主吹风口14扩散的气流包括围绕轴流风扇50的风扇轴线的高速区及在高速区外围的低速区。为了最大化的增加流入主吹风管11内的气流量,轴向进风口12的横截面积设计较大,而气流向主吹风口14流动的过程中,下游区域的横截面积基本维持不变。一方面,为了最大化的使气流的流速保持较高水平,则主吹风口14的横截面积相较于轴向进风口12的横截面积较小。另一方面,在辅助吹风管13工作时,由于辅助进风口的横截面积增大,流入至辅助吹风管13内的气流在辅助进风口前端的风速自然降低,且与低速气流混合,但如果高速气流和低速气流混合不均匀,则也会影响吹风效果。因此,轴向进风口12的横截面积和主吹风口14的横截面积一起约束和影响着最终的出风风速。如若,轴向进风口12的横截面积过大、主吹风口14或辅助吹风管13的处风口的横截面积过小均不利于稳定、高速的气流形成。本申请的一些实施例中,将轴向进风口12处的横截面积与主吹风口14的横截面积之比率设定为小于1.65,如此,使气流的流速保持较高水平,且在第二工作模式下,不会发生与低速气流的混合不均现象,避免了气流紊乱,保证从轴向出风口的高速气流的长度和横截面积,进一步地提高了花园吹风机100的吹风效果。
如图4-图5所示,一些实施例中,主吹风管11沿其轴线方向设有间隔设置的第一卡槽112和第二卡槽114,辅助吹风管13上设有与第一卡槽112和第二卡槽114适配的限位部134。其中,第一卡槽112相较于第二卡槽114更靠近轴 流风扇50和电机40,当限位部134卡接于第一卡槽112,主吹风口14被显露,外界空气自轴向进风口12进入,并由主吹风口14向外吹出,花园吹风机处于第一工作模式。当限位部134卡接于第二卡槽114,主吹风口14被隐藏于辅助吹风管13内,外界空气自轴向进风口12进入,并由辅助吹风管13的管口向外吹出,花园吹风机处于第二工作模式下。具体到一个实施例中,主吹风管11沿其轴线方向还设有导轨(图未标),辅助吹风管13借助于所述导轨沿主吹风管11的轴线方向可滑动地连接于所述主吹风管11。限位部134具有用于与第一卡槽112和第二卡槽114适配的卡接端和用于触压的按压端,按压端与主吹风管11之间还设有弹性件136,所述卡接端和按压端被构造为形成杠杆的两端。在触压按压端时,弹性件136被压缩,卡接部能够从第一卡槽112或第二卡槽114脱离,在释放按压端时,弹性件136恢复形变,迫使卡接端卡入第一卡槽112或第二卡槽114内,从而实现辅助吹风管13和主吹风管11之间的轴向限位。
示例地,一些实施例中,电池包60的标称输出电压小于或等于20V,电池包60的容量在2Ah~9Ah之间,电机40的最大转速在18000rpm~35000rpm之间,花园吹风机100未连接有电池包60时的重量不超过1.8kg,优选为不超过1.5kg,花园吹风机100在第一工作模式下的最大风速在90mph~110mph之间,花园吹风机100在第二工作模式下的最大风量在350cfm~500cfm之间,电池包的工作时长不小于6min。具体地,单个电池包60的标称输出电压为20V,电池包60容量为4Ah,电机40的最大转速在20000rpm~30000rpm之间,该吹风机未连接有电池包60时的重量不超过1.5kg。该吹风机在第一工作模式下的最大风速在90mph~100mph之间,在第二工作模式下的最大风量在380cfm~480cfm之间,电池包的工作时长不小于10min。
另一些实施例中,电池包60的标称输出电压大于20V,且小于56V,电池包60的容量在2Ah~9Ah之间,电机40的最大转速在20000~38000rpm之间,花园吹风机100未连接有电源时的重量不超过2kg,优选为不超过1.8kg,花园吹风机100在第一工作模式下的最大风速在110mph~180mph之间,花园吹风机100在第二工作模式下的最大风量在420cfm~650cfm之间,电池包的工作时长不小于6min。具体地,花园吹风机包括为电机40供电的第一电池包和第二电 池包,第一电池包和第二电池包的标称输出电压均为20V,电池包的容量在4Ah,吹风机未连接有电池包时的重量不超过1.8kg,电机40的最大转速在20000rpm~38000rpm之间。该吹风机在第一工作模式下的最大风速在130mph~165mph之间,在第二工作模式下的最大风量在480cfm~630cfm之间,电池包的工作时长不小于10min。其中,现有技术的中,类似性能的花园吹风机100的质量均较重,而本申请实施例中的花园吹风机,在满足风量和风速性能要求的前提下,有效提高了用户的使用体验。
相较于传统式吹风机,本申请风道部10整体长度缩短。如此,气流在风道部23中流动阻力降低,整机可以具有较小的体积。具体地,风道部10在纵向上的长度与花园吹风机100整机在纵向上的长度之比小于或等于70%,电机的最大转速配置在大于或等于18000rpm,且小于或等于40000rpm。优选地,风道部10在纵向上的长度与花园吹风机100整机在纵向上的长度之比小于或等于65%,电机的最大转速配置在大于或等于18000rpm,且小于38000rpm。具体地,整机的长度为850mm~1000mm,风道部10为直线型的,风道部10的长度不大于600mm。因此风道部的长度可以为600mm、580mm、560mm、540mm、520mm、500mm、480mm、460mm、440mm等,优选地,风道部10的长度在440mm~560mm之间。
具体到一些实施例中,单个电池包的标称输出电压小于或等于20V,电池包的容量在2Ah~9Ah之间,电机的最大转速在18000rpm~35000rpm之间,风道部的长度小于等于600mm,具体的可以为450mm;当单个电池包的标称输出电压大于20V,且小于56V,所述电机的最大转速在20000rpm~38000rpm之间,风道部的长度小于等于570mm,具体的可以为500mm;花园吹风机100的纵长一般不小于750mm,因此,花园吹风机100的纵长可以为850mm,880mm,920mm,950mm,989mm。
在本申请中,缩短了风道部10的长度,能够减少风速衰减,因此,主吹风管11长度必然减小。具体地,主吹风管11长度可以配置为不大于450mm,具体到实施例中,当电池包的标称输出电压小于或等于20V,例如,单个电池包的标称输出电压不大于20V,单个电池包的容量是2Ah~5Ah;电池包的数量为 1个,或者电池包的数量为2个,2个电池包串联或并联连接。电机的最大转速在18000rpm~35000rpm之间,主吹风管11的长度小于等于400mm,具体的可以为350mm。当所述电池包的标称输出电压大于20V,且小于56V,例如,单个电池包的标称输出电压大于20V,单个电池包的容量是4Ah电池包的数量为2个,2个电池包串联或并联连接。所述电机的最大转速在20000rpm~38000rpm之间,主吹风管11的长度小于等于420mm,具体的可以为380mm。
应当理解的是,在辅助吹风管13的纵长太长时,气流损失势必要大,无法维持从其出风口流出的气流形成的高速尾流区具有理想的长度,且无法保证高速尾流区的横截面积大。当然,辅助吹风管13在纵向上的长度太短,自辅助进风口进入至辅助吹风管13内的高速区气流和低速区气流混合不均匀,气流紊乱,影响辅助吹风管13的出风口的出风效果。因此,一些实施例中,辅助吹风管13在纵向上的长度设置在100~160mm之间。优选地,如前述的实施例中,辅助吹风管13的长度为110mm~140mm之间。
特别指出的是,花园吹风机整体形成以用户握持的部位为支点的杠杆结构,杠杆结构的两端分别为电池包60和包含有进风护罩70和风道部10的机芯。具体地,将连接在延长杆20远端的元件定位为第一重量单元(包括进风护罩70、电机40、轴流风扇50、导流结构80(包括导流锥82、静叶片54)以及包绕在这些元件外的外壳体),连接在延长杆20近端的元件定义为第二重量单元(操作手柄30和电池包60)。为了减轻花园吹风机100的重量,需要尽量减小上述重量单元的重量,其中,第一重量单元和第二重量单元对花园式吹风机的重心影响较大,需要保证花园吹风机100连接电池包60后的重心靠近操作手柄30,以提高用户的操作体验。
图11示出了本申请另一实施例中的花园吹风机的第一重量单元的重心、第二重量单元的重心和整机的重心的位置示意图;图12示出了本申请又一实施例中的花园吹风机的第一重量单元的重心、第二重量单元的重心和整机的重心的位置示意图。
参阅图11,一些实施例中,电池包60包括与电池包安装部配接的第一电池包和第二电池包。例如,第一电池包包和第二电池包的标称输出电压均为20V, 容量为5Ah,第一电池包和第二电池包的总重量约为1.2~1.4kg。此时,第二重量单元的重量大于第一重量单元的重量,整机的重心靠后。其中,第二重量单元的重量和安装有电池包60的所述花园吹风机100的总重量之比不大于0.5。第二重量单元的重量与第一重量单元的重量比不超过2.5。优选地,第二重量单元的重量与第一重量单元的重量比不超过2.3,不小于1.05。例如,在整机小型化之后,第二重量单元的重量为1.96kg,第二重量单元的重量为0.88kg。
在延长杆20的纵向延伸方向上,结合有电池包60的花园吹风机的重心在与轴流风扇50的转动面相垂直的平面上的正投影为G’,控制开关34上靠近延长杆20的前端在与轴流风扇50的转动面相垂直的平面上的正投影为K’,正投影G’配置为自正投影K’向前向后距离70mm范围之内。优选地,整机重心位置在与轴流风扇50转动面相垂直的平面上的正投影G’位于投影K’向前35mm。通过将电池包60安装在整机的后侧,平衡花园吹风机重心G’的位置(这里的重心G’理解为配接有电池包状态下的整机重心的投影),且由于本实施方式中的花园吹风机本身重量较低,从重量上来讲,已经大大减轻使用者握持机器的疲劳度。
第一重量单元的重心M在与轴流风扇50的转动面相垂直的平面上的正投影与正投影G’的距离为L1,第二重量单元的重心J在与轴流风扇50的转动面相垂直的平面上的正投影与正投影G’的距离为L2,在延长杆20的纵向延伸方向上,距离L2是距离L1的40%~60%的范围内,将延长杆20暴露于外界的长度配置为110~135mm范围内,第一重量单元的纵向长度在480mm~650mm之间。
延长杆20暴露于外界的长度为延长杆20去掉与进风护罩70和操作手柄30结合部分的长度。这样,与延长杆20远端相连的风道部10整体长度较短。如此,气流在风道部10中流动阻力降低,风道部10的最大径向尺寸可以缩短。在风道部10长度和最大径向尺寸均缩短的情况下,风道部10的体积大大缩小,实现整机小型化。
这样的话,当电池包60连接至电池包安装部上,安装有电池包60的花园吹风机100的重心与轴向出风口12的最前端缘的纵向距离与花园吹风机100的纵向长度的比值不小于0.75。优选地,安装有电池包60的花园吹风机100的重心与轴向出风口12的最前端缘的纵向距离与花园吹风机100的纵向长度的比值 不小于0.8。具体到实施例中,第一电池包、第二电池包靠近操作手柄30设置,装有第一电池包、第二电池包的花园吹风机100的重心在延长杆20上的投影位于操作手柄30在延长杆20上的投影范围内。如此,在花园吹风机100连接有电池包60时,合理的电池包60配置,一方面可以调节整机的重心G’,提升手持模式的舒适度,另一方面,维持机器运行的时间,在本实施方案中,两个电池包60的配置可以维持机器运行时间大于等于8min。为了避免增加花园吹风机100的纵向长度,电池包安装部位于操作手柄30的下方,电池包安装部和操作手柄30在延长杆20上的投影至少部分重合。
在另一些实施例中,如图12所示,电池包安装部设置在靠近延长杆20的近端,为电机40供电的电池包的数量可以是一个,电池包的标称输出电压小于或等于20V,电池包的容量在2Ah~9Ah,电机40的最大转速在18000rpm~35000rpm之间。该花园吹风机未连接有电池包时的重量不超过1.8kg,且在第一工作模式下的最大风速在90mph~110mph之间,在第二工作模式下的最大风量在350cfm~500cfm之间,电池包的工作时长不小于8min。在延长杆20的纵向延伸方向上,结合有电池包的花园吹风机的重心在与轴流风扇50的转动面相垂直的平面上的正投影为G’,控制开关34靠近延长杆的前端在与轴流风扇的转动面相垂直的平面上的正投影为K’,正投影G’配置为自正投影K’向前向后距离100mm范围之内,优选地,该吹风机未连接有电池包时的重量不超过1.5kg,投影G’配置为自投影K’向前向后距离50mm范围之内。通过将电池包安装在整机的后侧,平衡吹风机重心G’的位置(这里的重心G’理解为配接有电池包状态下的整机重心的投影),且由于本实施方式中的吹风机本身重量较低,从重量上来讲,已经大大减轻使用者握持机器的疲劳度。
进一步的,为了使得整机的重心尽可能的靠近操作手柄30,一方面减小机芯部分的重量,调整整机的操作舒适性,另一方面减小延长杆20的长度,缩短了机芯与控制开关34之间的力臂。但是,当裸露在外的延长杆20的长度太短,势必会导致与延长杆20相连的风道部10整体长度较长,风道部10增长会影响整机小型化,另外风道部10越长,气流损失越大,影响整机性能。
更进一步的,如图12所示,第一重量单元的重心M在与轴流风扇50的转 动面相垂直的平面上的投影与投影G’的距离为L1,第二重量单元J的重心在与轴流风扇50的转动面相垂直的平面上的投影与投影G’的距离为L2,在延长杆20的纵向延伸方向上,距离L2是距离L1的60%~80%的范围内,将延长杆20暴露于外界的长度配置为100~140mm范围内,第一重量单元的纵向长度在420mm~560mm之间。
需要说明的是,距离L1和距离L2是吹风机处于平置状态下,在与转动面相垂直的平面上的正投影之间的距离。
在本申请的实施例中,电池包可以至少适配连接在两种不同种类的手持工具上,例如打草机、链锯、割草机、吹风机、吹吸机、电钻、电锯、修枝机、压力清洗机等电池式的手持工具,第二重量单元的重量不大于第一重量单元的140%,不小于第一重量单元的105%。例如,在整机小型化之后,第一重量单元的重量约为0.7kg,第二重量单元的重量为约0.94kg。
如图1所示,现有技术中的一种花园吹风机100的轴向进风口12围绕在花园吹风机100的最后端设置,操作手柄30和/或电池包60支撑在风道部10的上方,风道部10在纵向上的长度基本等于花园吹风机100在纵向上的长度,花园吹风机100的长度一般在800~900mm之间;现有技术的中的另一种花园吹风机100,电池包安装部设置在风道部10的后端(未图示),风道部10至少在侧部和底部形成有供外界空气流入至风道部10内的轴向进风口12。风道部10的长度与花园吹风机100在纵向上的长度的比值不小于3/4。上述两种花园吹风机100,不能够使得电机40的性能被利用到最佳,且风机的风量和风速也得到兼顾。
本申请的发明人研究发现,进风护罩70和风道部10轴向进风口12的尺寸影响和约束着电机40的尺寸和轴流风扇50的尺寸,且与花园吹风机100的风速和风量息息相关,而风道部10和整机的长度尺寸,也影响着气流是否能够快速流动,最终反馈在花园吹风机100的风速和风量。因此,在风量和风速为预定值时,进风护罩70的最大高度为H和最大宽度W,以及花园吹风机100的长度L也影响着能否将电机40的性能发挥到最大。一些实施例中,进风护罩70的最大高度为H,进风护罩70的最大宽度为W,其中,进风护罩70的最大高 度H与整机长度为L的比值小于0.15,进风护罩70的最大宽度度W与整机长度为L的比值小于0.15,花园吹风机提供的风量为大于或等于350cfm,且小于或等于650cfm,提供的风速为大于或等于70mph,且小于185mph。如此,可以使花园吹风机的吹风性能和吹风效率达到较佳,且进一步将高转速加小轴流风扇50的机芯的作用最大化。具体到一些实施例中,进风护罩70的最大高度H为大于80mm,且小于130mm;所述进风护罩70的最大宽度W为大于80mm,且小于130mm;花园吹风机的整机长度L为850mm~1000mm之间。
示例地,电池包60的标称输出电压小于等20V,电池包60的容量在2~9Ah之间,电机40的最大转速在18000rpm~35000rpm之间,进风护罩70的最大高度与花园吹风机的整机长度的比值范围在0.09~0.133之间,且进风护罩70的最大宽度与花园吹风机的整机长度的比值范围在0.09~0.133之间,花园吹风机的最大风速在90mph~110mph之间,花园吹风的最大风量在350cfm~500cfm之间。另一些实施例中,电池包60的标称输出电压大于20V,且小于等于56V,电池包60的容量在2Ah~9Ah之间,电机40的转速在20000rpm~38000rpm之间,进风护罩70的最大高度与花园吹风机的整机长度的比值范围在0.11~0.16之间,且进风护罩70的最大宽度与花园吹风机的整机长度的比值围在0.11~0.16之间,花园吹风机的最大风速在110mph~160mph之间,花园吹风的最大风量在420cfm~650cfm之间。如此,可以满足电机40的性能被利用到最佳,且吹风机的风量和风速达到较佳水平。
上述的花园吹风机100,电机40、轴流风扇50、导流结构80组成的机芯设置于风道部10内,且与用于握持的操作手柄30在纵向上拉开一定距离,一方面,风道部10的长度变短,电机40带动轴流风扇50高速旋转时,外界的空气能够被快速的、足够的引入至风道部10内,空气快速的流入,气流损失小且足够量的气流在电机40的驱动下,快速流动,风压大,可以在同样的风速和风量下缩小风道部10的径向尺寸,从而优化了花园吹风机100的风速和体积,进而也降低了花园吹风机100的重量。另一方面,利用主吹风管11和辅助吹风管13相互配合使花园吹风机100在高风速的第一工作模式和大风量的第二工作模式之间切换,可以满足不同工况对于风速和风量的性能需求,提高了花园吹风机 100的性能体验。再一方面,通过对电机40、轴流风扇50、风道部10、风量和风速进行参数化的合理配置,形成高转速电机40和小轴流风扇50的格局,在实现小巧、轻量化的同时,能够满足花园吹风机100的性能需求。
以上所述实施例的各技术特征可以进行任意的组合,为使描述简洁,未对上述实施例中的各个技术特征所有可能的组合都进行描述,然而,只要这些技术特征的组合不存在矛盾,都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对申请专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本申请构思的前提下,还可以做出若干变形和改进,这些都属于本申请的保护范围。因此,本申请专利的保护范围应以所附权利要求为准。

Claims (15)

  1. 一种花园吹风机,能够将散落的异物集中,其特征在于,所述花园吹风机包括:
    风道部,包括与外界连通的轴向进风口;
    电机,为所述花园吹风机提供驱动力;
    轴流风扇,设置在所述风道部内;
    进风护罩,连接在所述轴向进风口上,所述电机驱动所述轴流风扇能够绕风扇轴线旋转并将外界空气透过所述进风护罩从所述轴向进风口引入;所述进风护罩与所述轴向进风口连接,且包括多个供气流通过的护罩孔,多个所述护罩孔的通风面积之和界定出所述进风护罩的有效通风总面积;
    操作手柄,用于使用者操作握持;以及
    电池包安装部,用于与为所述电机供电的电池包可拆卸地连接,所述电池包安装部靠近所述操作手柄处设置;
    延长杆,沿纵向方向延伸,所述操作手柄和所述风道部借助于所述延长杆在纵向方向上彼此拉开;
    所述轴流风扇的叶片边缘的线速度大于80m/s,所述进风护罩的有效通风总面积小于12000mm 2
  2. 根据权利要求1所述的花园吹风机,其特征在于,所述进风护罩被构造为在所述轴流风扇的风扇轴线上纵向延伸;
    所述进风护罩一端与所述轴向进风口连接,另一端支撑在所述延长杆上,所述轴流风扇转动能够形成转动面,所述进风护罩沿纵向落在所述转动面所在平面上的正投影的投影面积为S1;
    所述延长杆连接所述进风护罩的一端沿纵向落在所述转动面所在平面上的正投影的投影面积S2;
    其中,6≤S1/S2≤16。
  3. 根据权利要求1所述的花园吹风机,其特征在于,所述延长杆具有在纵向上彼此相对的第一端和第二端,所述延长杆通过所述第一端连接所述进风护罩,所述延长杆通过所述第二端连接所述操作手柄;
    所述轴流风扇转动能够形成转动面,所述第一端沿所述延长杆的纵向延伸 方向落在所述转动面所在平面上的正投影始终位于所述转动面的外轮廓边界之内,所述进风护罩的横截面积小于13300mm 2
  4. 根据权利要求3所述的花园吹风机,其特征在于,所述进风护罩设有在所述延长杆的延伸方向上延伸预设距离的插接部,所述护罩孔周向分布在所述插接部的外围;
    所述花园吹风机还包括第一连接结构,所述延长杆的所述第一端通过所述第一连接结构与所述进风罩的所述插接部进行锁定连接;
    其中,沿所述延长杆的延伸方向,所述第一连接结构落在所述转动面所在平面上的正投影与所述护罩孔落在所述转动面所在平面上的正投影基本不重合。
  5. 根据权利要求4所述的花园吹风机,其特征在于,所述插接部被构造为中空的插接孔道,所述第一连接结构包括:
    设置在所述插接孔道上的定位孔;及
    设置于所述延长杆上的定位件;
    其中,所述定位件具有与所述定位孔形成卡接的锁定状态,以限制所述延长杆自所述插接部向后脱出。
  6. 根据权利要求5所述的花园吹风机,其特征在于,在所述锁定状态时,所述定位件的外轮廓在径向上向外超出所述定位孔内壁面的轮廓。
  7. 根据权利要求5所述的花园吹风机,其特征在于,所述定位件还具有保持其形状插入所述插接部内的自然状态,在所述自然状态时,所述定位件处于与所述定位孔相对应的预设位置;
    且,所述定位件被构造为在承受外界作用力时能够改变其形状处于所述锁定状态。
  8. 如权利要求5所述的吹风机,其特征在于,所述第一连接结构还包括设置在所述插接部的止挡部,所述止挡部能够与所述延长杆的所述第一端抵接以阻止所述延长杆自所述插接部向前移动。
  9. 根据权利要求1所述的花园吹风机,其特征在于,所述风道部包括主吹风管及与所述主吹风管连通设置的辅助吹风管,所述主吹风管设有所述轴向进 风口和与所述轴向进风口对置的主吹风口,所述辅助吹风管具有与所述主吹风口连通的辅助进风口,在与所述纵向相垂直的方向上,所述辅助进风口的横截面积大于所述主吹风口的横截面积,所述主吹风口和所述辅助进风口之间具有供外部气流进入所述辅助吹风管内的间隙。
  10. 根据权利要求9所述的花园吹风机,其特征在于,所述花园吹风机能够通过所述辅助吹风管在相对较高的风速和相对较低的风量排出空气的第一工作模式,与相对较低的风速和相对较高风量排出空气的第二工作模式之间切换;
    所述辅助吹风管与主吹风管为活动连接,所述辅助吹风管能够沿纵向向后收拢或向前伸出,以使所述花园吹风机在第一工作模式和第二工作模式之间切换。
  11. 根据权利要求10所述的花园吹风机,其特征在于,所述电池包的标称输出电压小于或等于20V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在18000rpm~35000rpm之间,所述花园吹风机未连接有所述电池包时的重量不超过1.5kg,所述花园吹风机在第一工作模式下的最大风速在90mph~110mph之间,所述花园吹风机在第二工作模式下的最大风量在350cfm~500cfm之间;或者
    所述电池包的标称输出电压大于20V,且小于56V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在20000rpm~38000rpm之间,所述花园吹风机未连接有所述电池包时的重量不超过1.8kg,所述花园吹风机在第一工作模式下的最大风速在110mph~180mph之间,所述花园吹风机在第二工作模式下的最大风量在420cfm~650cfm之间。
  12. 根据权利要求11所述的花园吹风机,其特征在于,所述风道部的长度不超过600mm。
  13. 根据权利要求10所述的花园吹风机,其特征在于,所述电池包的标称输出电压小于或等于20V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在18000rpm~35000rpm之间,所述电机的直径小于或等于40mm,所述轴向进风口与所述风扇轴线相垂直的横截面的最大有效通风面积小于9000mm 2,所述轴流风扇的外径大于或等于50mm,小于或等于67mm;或者
    所述电池包的标称输出电压大于20V,且小于56V,所述电池包的容量在2Ah~9Ah,所述电机的最大转速在20000rpm~38000rpm之间,所述电机的直径小于或等于45mm,所述轴向进风口与所述风扇轴线相垂直的横截面的最大有效通风面积小于13000mm 2,所述轴流风扇的外径大于或等于50mm,小于或等于67mm。
  14. 根据权利要求1所述的花园吹风机,其特征在于,所述轴流风扇的叶片外边缘与所述风道部内壁之间设有缝隙;
    所述缝隙在径向上的尺寸小于1mm。
  15. 根据权利要求1所述的花园吹风机,其特征在于,所述操作手柄的最高点到所述延长杆的最低点的直线距离小于140mm,大于40mm。
PCT/CN2021/121354 2020-09-29 2021-09-28 花园吹风机 WO2022068825A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US18/029,045 US20230371449A1 (en) 2020-09-29 2021-09-28 Garden blower
EP21874481.1A EP4223934A1 (en) 2020-09-29 2021-09-28 Leaf blower

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202011053850.X 2020-09-29
CN202011053850 2020-09-29
CN202011425445.6A CN114319210A (zh) 2020-09-29 2020-12-08 花园吹风机
CN202011425445.6 2020-12-08

Publications (1)

Publication Number Publication Date
WO2022068825A1 true WO2022068825A1 (zh) 2022-04-07

Family

ID=80949677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/121354 WO2022068825A1 (zh) 2020-09-29 2021-09-28 花园吹风机

Country Status (3)

Country Link
US (1) US20230371449A1 (zh)
EP (1) EP4223934A1 (zh)
WO (1) WO2022068825A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104248394A (zh) * 2013-06-26 2014-12-31 苏州宝时得电动工具有限公司 吹风机
CN205046514U (zh) * 2015-10-22 2016-02-24 永康市威力园林机械有限公司 一种电池包后置的直流吹风机
DE202017106572U1 (de) * 2017-10-30 2018-01-31 Nanjing Chervon Industry Co., Ltd. Bläser
CN111749912A (zh) * 2019-03-27 2020-10-09 苏州宝时得电动工具有限公司 花园吹风机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104248394A (zh) * 2013-06-26 2014-12-31 苏州宝时得电动工具有限公司 吹风机
CN205046514U (zh) * 2015-10-22 2016-02-24 永康市威力园林机械有限公司 一种电池包后置的直流吹风机
DE202017106572U1 (de) * 2017-10-30 2018-01-31 Nanjing Chervon Industry Co., Ltd. Bläser
CN111749912A (zh) * 2019-03-27 2020-10-09 苏州宝时得电动工具有限公司 花园吹风机
CN111749175A (zh) * 2019-03-27 2020-10-09 苏州宝时得电动工具有限公司 吹风机
CN212129012U (zh) * 2019-03-27 2020-12-11 苏州宝时得电动工具有限公司 吹风机
CN212717246U (zh) * 2019-03-27 2021-03-16 苏州宝时得电动工具有限公司 花园吹风机

Also Published As

Publication number Publication date
US20230371449A1 (en) 2023-11-23
EP4223934A1 (en) 2023-08-09

Similar Documents

Publication Publication Date Title
US10227988B2 (en) Blower and a blowing vacuum device
US10398095B2 (en) Blowing-suction device
WO2018028639A1 (zh) 花园吹风机
US6105206A (en) Portable electrically powered blower apparatus
CN106149603B (zh) 花园吹吸装置
CN212129012U (zh) 吹风机
KR102061517B1 (ko) 청소기
CN214737695U (zh) 花园吹风机
WO2022068825A1 (zh) 花园吹风机
ITVI960028A1 (it) Dispositivo portatile aspirante/soffiante
CN108138455B (zh) 花园吹风机
US11617312B2 (en) Backpack tool apparatus
AU2017100665A4 (en) An electric tool
CN211484334U (zh) 吸尘装置及吸尘设备
AU2015101868A4 (en) Air blower and blower/vacuum apparatus
CN110840326A (zh) 吸尘装置及吸尘设备
CN111336116A (zh) 吹吸风机
CN212899034U (zh) 一种静音型吹吸风机
CN220166786U (zh) 吹风机
CN102392824A (zh) 一种吹风机
JP2000083869A (ja) 電気掃除機
WO2020125255A1 (zh) 吹吸风机
CN108730212A (zh) 一种新型调节式离心通风机
CN111981529A (zh) 一种旋吸式烟机
CN113846592A (zh) 吹风机

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21874481

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2021874481

Country of ref document: EP

Effective date: 20230502