Garden blower

Abstract

The invention relates to a garden hair drier, which comprises an air duct part, an air outlet part and an air outlet part, and is characterized in that the air duct part comprises an axial air inlet communicated with the outside; the motor is used for providing driving force for the garden blower; the axial flow fan is arranged in the air duct part; the operating handle is used for being operated and held by a user; the battery pack is used for supplying power to the motor; the extension rod extends in the longitudinal direction, and the operation handle and the air duct part are pulled open in the longitudinal direction by means of the extension rod; the ratio of the length of the air duct part in the longitudinal direction to the length of the whole garden blower in the longitudinal direction is smaller than or equal to 70%, and the total effective ventilation area of the air inlet shield is smaller than 12,000 mm < 2 >.

Description

[0001] This application is a divisional application of the Chinese invention patent application with a priority date of September 29, 2020, priority application number CN202011053850.X, an application date of December 8, 2020, application number CN202011425445.6, and invention name “Garden Hair Dryer”. Technical Field

[0002] The present application relates to the field of electric tools, and in particular to a garden hair dryer. Background Art

[0003] As urban greening areas continue to expand, green belts in public places such as parks and highways are spread all over the country, and garden tools are also widely used. Garden blowers are a common garden tool that uses airflow to blow to the ground to remove dust or debris for cleaning.

[0004] Generally, the weight of a garden blower is supported by the user, and when the user holds the machine for cleaning, the height of the machine from foreign objects on the ground, the angle between the machine and the ground, and the swing amplitude of the machine are all determined by the way the user holds the machine. Therefore, reducing the size and weight of the garden blower and improving the human-machine effect have always been the subjects of research and development personnel's tireless research. Summary of the invention

[0005] Based on this, it is necessary to provide a garden hair dryer with smaller overall size, lighter overall weight and performance that meets the requirements.

[0006] In order to achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] According to one aspect of the present application, a garden blower is provided, which can collect scattered foreign matter, and the garden blower comprises:

[0008] An air duct portion, including an axial air inlet communicating with the outside;

[0009] a motor, providing driving force for the garden blower;

[0010] An axial flow fan is arranged in the air duct portion;

[0011] An air inlet shield connected to the axial air inlet, wherein the motor drives the axial flow fan to rotate around the fan axis and introduces outside air from the axial air inlet through the air inlet shield; the air inlet shield is connected to the axial air inlet and includes a plurality of shield holes for air flow to pass through, and the sum of the ventilation areas of the plurality of shield holes defines the total effective ventilation area of ​​the air inlet shield;

[0012] An operating handle for a user to hold and operate; and

[0013] A battery pack mounting portion, used for detachably connecting to a battery pack for powering the motor, the battery pack mounting portion being disposed near the operating handle;

[0014] An extension rod extending in a longitudinal direction, wherein the operating handle and the air duct portion are pulled apart from each other in the longitudinal direction by means of the extension rod;

[0015] The linear velocity of the blade edge of the axial flow fan is greater than 80m / s, and the total effective ventilation area of ​​the air inlet shield is less than 12000mm 2 .

[0016] The above-mentioned garden hair dryer comprehensively considers and configures the speed and volume of the motor, the diameter of the axial fan, and the power of the motor with the nominal voltage and capacity of the battery pack, so as to maximize the small size, small diameter and lightweight design. At the same time, the size of the axial air inlet of the air duct section and the total effective ventilation area of ​​the air inlet shield affect and constrain the air volume, and also constrain and affect the size of the motor and the size of the axial fan. By limiting the total effective ventilation area of ​​the air inlet shield, the pattern of "small" air inlet and "thin" air duct section is also established. While being able to achieve low power consumption, it can also meet the battery life of the DC battery pack and ensure wind speed and air volume, thereby obtaining higher blowing efficiency and better blowing effect.

[0017] In one embodiment, the air inlet shroud is configured to extend longitudinally on a fan axis of the axial flow fan;

[0018] 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 axial flow fan can rotate to form a rotating surface, and the projection area of ​​the orthographic projection of the air inlet shield falling on the plane where the rotating surface is located in the longitudinal direction is S1;

[0019] The projection area S2 of the orthographic projection of one end of the extension rod connected to the air inlet shield falling on the plane where the rotating surface is located in the longitudinal direction;

[0020] Among them, 6≤S1 / S2≤16.

[0021] In one embodiment, the extension rod has a first end and a second end which are opposite to each other in the longitudinal direction, the extension rod is connected to the air inlet shield via the first end, and the extension rod is connected to the operating handle via the second end;

[0022] The axial flow fan can rotate to form a rotating surface, the orthographic projection of the first end along the longitudinal extension direction of the extension rod on the plane where the rotating surface is located is always located within the outer contour boundary of the rotating surface, and the cross-sectional area of ​​the air inlet shield is less than 13300mm 2 .

[0023] In one embodiment, the air inlet shield is provided with a plug-in portion extending a preset distance in the extension direction of the extension rod, and the shield holes are circumferentially distributed around the outer periphery of the plug-in portion;

[0024] The garden hair dryer further comprises a first connection structure, and the first end of the extension rod is locked and connected with the plug-in portion of the air inlet cover through the first connection structure;

[0025] Wherein, along the extension direction of the extension rod, the orthographic projection of the first connection structure falling on the plane where the rotating surface is located and the orthographic projection of the shield hole falling on the plane where the rotating surface is located are basically not overlapped.

[0026] In one embodiment, the plug-in portion is configured as a hollow plug-in channel, and the first connection structure includes:

[0027] A positioning hole provided on the inner wall of the plug-in channel; and

[0028] A positioning member provided on the extension rod;

[0029] Wherein, the positioning member has a locking state formed with the inner wall of the positioning hole to limit the extension rod from slipping out backward from the plug-in portion.

[0030] In one embodiment, in the locked state, the outer contour of the positioning member radially extends outwardly beyond the contour of the inner wall surface of the positioning hole.

[0031] In one embodiment, the positioning member also has a natural state in which the positioning member is inserted into the plug-in portion while maintaining its shape. In the natural state, the positioning member is in a preset position corresponding to the positioning hole.

[0032] Furthermore, the positioning member is constructed so as to be able to change its shape to be in the locking state when subjected to external force.

[0033] In one embodiment, the first connection structure further includes a stopper portion disposed on the plug-in portion, and the stopper portion can abut against the first end of the extension rod to prevent the extension rod from moving forward from the plug-in portion.

[0034] In one embodiment, the air duct portion includes a main blowing pipe and an auxiliary blowing pipe connected to the main blowing pipe, the main blowing pipe is provided with the axial air inlet and the main blowing port opposite to the axial air inlet, the auxiliary blowing pipe has an auxiliary air inlet connected to the main blowing port, in a direction perpendicular to the longitudinal direction, the cross-sectional area of ​​the auxiliary air inlet is larger than the cross-sectional area of ​​the main blowing port, and there is a gap between the main blowing port and the auxiliary air inlet for external air flow to enter the auxiliary blowing pipe.

[0035] In one embodiment, the garden blower can be switched between a first working mode in which air is exhausted at a relatively high wind speed and a relatively low wind volume through the auxiliary blow pipe, and a second working mode in which air is exhausted at a relatively low wind speed and a relatively high wind volume;

[0036] The auxiliary blowing pipe is movably connected to 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.

[0037] In one embodiment, 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 weight of the garden hair dryer when not connected to the battery pack does not exceed 1.5kg, the maximum wind speed of the garden hair dryer in the first working mode is between 90mph and 110mph, and the maximum air volume of the garden hair dryer in the second working mode is between 350cfm and 500cfm; or

[0038] 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, the weight of the garden hair dryer when not connected to the battery pack does not exceed 1.8kg, the maximum wind speed of the garden hair dryer in the first working mode is between 110mph and 180mph, and the maximum air volume of the garden hair dryer in the second working mode is between 420cfm and 650cfm.

[0039] In one embodiment, the length of the air channel portion does not exceed 600 mm.

[0040] In one embodiment, 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, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 9000mm 2 , the outer diameter of the axial flow fan is greater than or equal to 50 mm and less than or equal to 67 mm; or

[0041] 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, the diameter of the motor is less than or equal to 45mm, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 13000mm 2 , the outer diameter of the axial flow fan is greater than or equal to 50 mm and less than or equal to 67 mm.

[0042] In one embodiment, a gap is provided between the outer edge of the blade of the axial flow fan and the inner wall of the air channel portion;

[0043] The radial dimension of the gap is less than 1 mm.

[0044] In one embodiment, 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.

[0045] According to another aspect of the present application, a garden blower is provided, which can collect scattered foreign matter, and the garden blower comprises:

[0046] An air duct portion, including an axial air inlet communicating with the outside;

[0047] a motor, providing driving force for the garden blower;

[0048] An axial flow fan is arranged in the air duct portion, and the motor drives the axial flow fan to rotate along the fan axis and introduce external air from the axial air inlet;

[0049] An air inlet shield connected to the axial air inlet, wherein the motor drives the axial flow fan to rotate along the fan axis and introduces external air from the axial air inlet through the air inlet shield;

[0050] An operating handle for a user to hold and operate; and

[0051] An extension rod extending in the longitudinal direction, wherein the operating handle and the air duct portion are pulled apart from each other in the longitudinal direction by means of the extension rod;

[0052] Among them, 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 hair dryer is greater than or equal to 350cfm and less than or equal to 650cfm, and the wind speed provided by the garden hair dryer is greater than or equal to 70mph and less than 185mph.

[0053] In one embodiment, the maximum width of the air inlet shield is W, wherein W:L is less than 0.15.

[0054] In one embodiment, the garden hair dryer further comprises a battery pack mounting portion for detachably combining with a battery pack for powering the motor, the battery pack mounting portion being disposed near the operating handle;

[0055] 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, the ratio of the maximum height of the air inlet shield to the overall length of the garden hair dryer is between 0.09 and 0.133, and the ratio of the maximum width of the air inlet shield to the overall length of the garden hair dryer is between 0.09 and 0.133, the maximum wind speed of the garden hair dryer is between 90mph and 110mph, and the maximum wind volume of the garden hair dryer is between 350cfm and 500cfm; or

[0056] The number of 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, the ratio of the maximum height of the air inlet shield to the overall length of the garden hair dryer is between 0.11 and 0.16, and the ratio of the maximum height of the air inlet shield to the overall length of the garden hair dryer is between 0.11 and 0.16, the maximum wind speed of the garden hair dryer is between 110mph and 160mph, and the maximum air volume of the garden blower is between 420cfm and 650cfm.

[0057] In one embodiment, the overall length of the garden hair dryer is between 850 mm and 1000 mm;

[0058] The maximum height of the air inlet shield is greater than 80 mm and less than 130 mm; the maximum width of the air inlet shield is greater than 80 mm and less than 130 mm.

[0059] In one embodiment, the length of the air duct portion does not exceed 600 mm, and the overall length of the garden hair dryer is greater than or equal to 850 mm and less than or equal to 1000 mm;

[0060] The weight of the garden blower does not exceed 1.8 kg.

[0061] In one embodiment, the air duct portion includes a main blowing pipe and an auxiliary blowing pipe connected to the main blowing pipe, a gap can be formed between the main blowing pipe and the auxiliary blowing pipe for external airflow to enter the auxiliary blowing pipe, and the garden hair dryer can switch between a first working mode of exhausting air at a relatively high wind speed and a relatively low wind volume and a second working mode of exhausting air at a relatively low wind speed and a relatively high wind volume through the auxiliary blowing pipe;

[0062] The ratio of the longitudinal length of the air duct portion to the longitudinal length of the garden hair dryer is less than or equal to 70%, the weight of the garden hair dryer does not exceed 1.8kg, and the maximum speed of the motor is configured to be greater than or equal to 18000rpm and less than 40000rpm. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 It is a structural schematic diagram of a garden hair dryer in the prior art;

[0064] Figure 2 This is a structural schematic diagram of a garden hair dryer in an embodiment of the present application in a first working state;

[0065] Figure 3 for Figure 2 The structural schematic diagram of the garden hair dryer shown is in the second working state;

[0066] Figure 4 is a cross-sectional schematic diagram of a garden hair dryer in an embodiment of the present application in a first working state;

[0067] Figure 5 for Figure 4 A cross-sectional schematic diagram of a garden hair dryer in a second working state is shown;

[0068] Figure 6 This is a schematic diagram of the 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 garden hair dryer in one embodiment of the present application;

[0069] Figure 7 It is a cross-sectional schematic diagram of the position of the air inlet shield of the garden hair dryer in one embodiment of the present application when the garden hair dryer is in a first working state;

[0070] Figure 8 for Figure 7 A schematic cross-sectional view of the air inlet shield of the garden hair dryer shown along the BB direction;

[0071] Fig. 9 It is a schematic diagram of the matching relationship between the positioning piece of the extension rod and the air inlet shield when the positioning piece of the extension rod in one embodiment of the present application is in a locked state;

[0072] Fig.10 for Fig. 9 The schematic diagram of the structure of the extension rod when the positioning member of the extension rod is in a natural state;

[0073] Fig.11 It 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 garden hair dryer in another embodiment of the present application;

[0074] Fig.12 This 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 entire garden hair dryer in yet another embodiment of the present application. DETAILED DESCRIPTION

[0075] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0076] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0079] In the present application, a first feature being “above”, “above”, or “above” a 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 higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0080] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0081] The hair dryer in the related prior art, such as Figure 1 As shown, it usually includes a main body shell 1, a duct, a fan for generating airflow, a motor for driving the fan and a blow pipe 2 connected to the main body shell. The motor, the duct and the fan are all arranged in the main body shell 1. The blow pipe 2 is connected to the main body shell and connected with the main body shell to form an airflow channel. An air outlet 4 is provided on the blow pipe, and an air inlet 3 is also provided on the shell. 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 hair dryer. The function of the duct is to guide the airflow generated by the fan to move toward the air outlet of the blow pipe. The air enters the interior of the shell from the air inlet 3 and flows from the airflow channel to the air outlet 4 for blowing out. The main body shell 1 is also provided with a handle 5 for the operator to hold. The motor is arranged outside the duct and below the handle 5.

[0082] The main problem of the above-mentioned garden hair dryer is that the miniaturization, lightweight and high working performance of the machine are contradictory. Specifically, the cleaning conditions encountered by the garden hair dryer mainly include: fallen leaves and small garbage on the ground outdoors at home or in the park, debris between the joints of the floor tiles, and wet leaves adhering to the ground. The inventors have found that in order to meet the cleaning requirements of the above-mentioned working conditions, the air volume and wind speed provided by the garden hair dryer are usually large enough. However, the miniaturization and lightweight of the functional components will weaken the working effect of the garden hair dryer, thereby reducing the cleaning ability, and the miniaturization and lightweight of the battery pack will shorten the running time of the garden hair dryer. For example, only reducing the volume and weight of the main housing 1, the duct, and the functional components will affect and restrict the working effect of the garden hair dryer. If the volume of the aforementioned components is not reduced and the weight is reduced by changing the material, the strength of the entire device will be affected and the production cost will be increased.

[0083] Therefore, the contradiction and mutual restriction between miniaturization, light weight and better working effect have always been the pain point of manufacturers.

[0084] The inventors of the present application have continued to study and found that the reason for the above problems in the relevant prior art is that the structures such as motors, fans, and air duct structures have not been reasonably configured with parameters and optimized in structure. For example, a more prominent problem is that the fan structure and size, the power and speed of the motor, and the air duct structure have not been considered in the design in combination with the blowing performance and power consumption, resulting in a small wind speed and air volume for the whole machine with a small size and mass, low blowing efficiency, and difficulty in blowing up heavier leaves that have fallen on the lawn and leaves that are located in the cracks. Alternatively, although the blowing efficiency of the whole machine with a larger size and mass is guaranteed, the noise is loud and the power consumption is too high. When using a battery pack for power supply, the hair dryer can only maintain a short working time and the human-machine experience is not good.

[0085] Therefore, it is necessary to provide a garden hair dryer with smaller overall size, lighter overall weight and performance that meets the requirements.

[0086] Figure 2 It shows a schematic structural diagram of a garden hair dryer in a first working state in one embodiment of the present application; Figure 3 Shows Figure 2 The structural schematic diagram of the garden hair dryer shown is in the second working state. For the convenience of explanation, only the parts related to the embodiment of the present application are shown.

[0087] 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 can be leaves or garbage. Figure 2 and Figure 3 As shown, the direction of airflow outflow corresponding to the air outlet is defined as the front (distal end). For example, the distal end of the garden hair dryer 100 refers to the end away from the user when the user uses the garden machine for cleaning. Correspondingly, the side where the airflow flows in is defined as the rear (proximal end). For example, the proximal end of the garden hair dryer 100 refers to the end of the garden hair dryer 100 close to the user when the user uses the garden machine for cleaning. The garden hair dryer 100 extends longitudinally between the proximal end (rear) and the distal end (front) approximately in the direction indicated by the arrow A. The top of the drawing is defined as the top, and the bottom of the drawing is defined as the bottom. As shown in Figure 2 As shown, the drawing is defined as the left side outward and the drawing is defined as the right side inward; Figure 3 As shown, the left side is defined as the inward direction of the drawing, and the right side is defined as the outward direction of the drawing. The height of the garden hair dryer refers to the size of the garden hair dryer in the up-down direction, and the width of the garden hair dryer refers to the size of the garden hair dryer in the left-right direction. It is understood that the above definitions are for illustration only and cannot be understood as limitations of this application.

[0088] The garden hair dryer 100 in at least one embodiment disclosed in the present application includes a housing, a motor 40, a fan and a power supply.

[0089] See also Figure 2-Figure 3 The housing includes an air duct portion 10 extending substantially in the longitudinal direction, an operating handle 30 for the user to hold, and an extension rod 20 extending in the longitudinal direction by a preset distance. The operating handle 30 and the air duct portion 10 are pulled apart from each other in the longitudinal direction by the extension rod 20. Specifically, in some embodiments, the air duct portion 10 includes an axial air inlet 12 (see FIG. 1 ) communicating with the outside. Figure 4 and Figure 5 ), the extension rod 20 is constructed as a tubular structure extending longitudinally between its proximal end and distal end, and the extension rod 20 includes a handle support section connected to the operating handle 30 at the rear side, an air duct support section connected to the air duct portion 10 at the front side, and a middle section connecting the handle support section and the air duct 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.

[0090] The operating handle 30 is used for the user to operate and hold, and has the grip portion 32 for the operator to hold. The operating handle 30 can be independently provided or integrally formed with the extension rod 20. For example, in some embodiments, the operating handle 30 can be constructed to be independently supported on the proximal end of the extension rod 20; in other embodiments, at least a portion of the proximal end of the extension rod 20 can form the operating handle 30. Furthermore, the air duct portion 10 extends longitudinally along a first axis (not shown), and the grip portion 32 extends longitudinally along a second axis (not shown). The first axis and the second axis define a first plane ( Figure 2 and Figure 3 The first plane and the second plane parallel to the second axis ( Figure 2 and Figure 3 The projection of the operating handle 30 on the second plane is spaced apart and separated by a certain distance from the projection of the air duct portion 10 on the second plane in the longitudinal direction. In some embodiments, the first axis and the second axis are arranged at an angle, so that when the handle portion 32 is held for blowing operation, the second axis of the handle portion 32 is usually roughly parallel to the horizontal plane, which makes the operation very comfortable and avoids fatigue from long-term work. Of course, in some other embodiments, the first axis can also be parallel to the second axis, which is conducive to reducing the size and volume of the garden hair dryer 100. In addition, a control switch 34 (see Figure 4 and Figure 5 ), the control switch 34 is electrically connected to the motor 40 to control the opening and closing of the motor 40. Indeed, the control switch 34 can also control the speed of the motor 40.

[0091] Figure 4A cross-sectional schematic diagram of a garden hair dryer in an embodiment of the present application in a first working state is shown; Figure 5 Shows Figure 4 The garden hair dryer is shown in a cross-sectional schematic diagram in a second working state.

[0092] See also Figure 4 and Figure 5 The air duct portion 10 is constructed as a tubular body with a hollow interior. An axial air inlet 12 and an axial air outlet (not marked in the figure) are respectively provided at the opposite ends of the air duct portion 10. It can be understood that the hollowness 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 roughly in the longitudinal direction. The number of the main blowing pipe 11 can be one and only one; of course, the main blowing pipe 11 can also be a blowing pipe with a complete blowing function formed by a combination of two or more sections of the pipe body. The main blowing pipe 11 is located at the far end of the extension rod 20. In this way, the overall length of the air duct portion 23 can be shortened, the flow resistance of the airflow in the air duct portion 10 is reduced, and the whole machine can have a smaller volume.

[0093] The fan is arranged in the air duct portion 10, and the motor 40 is connected to the fan, and is used 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 an airflow flowing toward the axial air outlet side, so as to provide driving force for the garden hair dryer. Specifically, the fan is an axial flow fan 50, and the axial flow fan 50 can provide a better blowing effect than a centrifugal fan. The axial flow fan 50 can be made of a fiber composite material structure or an aluminum metal structure or a magnesium metal structure. The fan axis of the axial flow fan 50 coincides with the center line of the air duct portion 10, and the blades of the axial flow fan 50 rotate to form a rotating surface, which is perpendicular to the fan axis of the axial flow fan 50 and the center line of the air duct portion 10, so as to facilitate the rapid flow of air. Specifically in the embodiment, 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 less than the length of the downstream area. The motor 40 is disposed in the upstream region of the air duct portion 10 and is longitudinally offset from the axial air inlet 12. The motor 40 has a motor shaft, which is connected to the axial flow fan 50 and can drive the axial flow fan 50 to rotate around its fan axis, thereby driving air to move from the upstream region to the downstream region of the air duct portion 10 to form an airflow. Of course, in some other embodiments, the motor shaft can also be connected to the axial flow fan 50 through a transmission mechanism, which is not limited here. For example, the transmission mechanism can be a planetary gear mechanism.

[0094] As a specific embodiment, the axial flow fan 50 includes a hub 52 matched with the motor shaft and a plurality of blades 54 mounted on the hub 52. A gap is provided between the outer edge of the blade 54 and the inner wall of the air duct portion 10 to avoid interference between the blade and the inner wall of the air duct portion 10 and to form a high-pressure, high-speed airflow. Preferably, the radial dimension of the gap is less than 1 mm. Furthermore, the axial flow fan 50 also includes a circumferential connecting belt, which surrounds and connects all the blades 54. The provision of the circumferential connecting belt can, on the one hand, increase the rigidity of the axial flow fan 50, extend the service life of the axial flow fan 50, and prevent the axial flow fan 50 from being damaged after being used for a period of time; on the other hand, it can increase the stability of the axial flow fan 50 after high-speed rotation, which helps to reduce the noise generated by the axial flow fan 50 after high-speed rotation.

[0095] The power supply is used to provide power to the motor 40. The power supply can be a DC power supply, specifically a rechargeable battery pack 60, which is mounted on the housing in a detachable manner. Specifically, the housing is provided with one or two or more battery pack mounting parts for the battery pack 60 to be combined, and the battery pack mounting part is arranged near the operating handle 30, and the number of battery packs 60 matches the number of battery pack mounting parts. It should be understood that the battery pack mounting part should be arranged near the operating handle 30, so that the weight unit can be as close to the operating grip point as possible, reducing the fatigue of the user. Specifically, in some embodiments, the battery pack mounting part 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. When the battery pack 60 is connected to the battery pack mounting part, in the longitudinal direction, the front end edge of the operating handle 30 is located between the rear end edge of the battery pack 60 and the axial air inlet 12, and the front end edge of the operating handle 30 and the rear end edge of the axial air inlet 12 are spaced a preset distance in the longitudinal direction. In this way, when the battery pack 60 is connected to the battery pack mounting portion, the battery pack 60 at the rear can balance the center of gravity of the garden hair dryer 100 in the longitudinal direction (the center of gravity here is understood to be the center of gravity of the whole machine when the battery pack 60 is connected). Figure 6 In the embodiment shown, the rated voltage of a single battery pack 60 is 20V, G' is the center of gravity of the garden hair dryer, J is the center of gravity of the first weight unit (battery pack 60 and handle 30), and M is the center of gravity of the second weight unit (core) of the garden hair dryer. In this way, the center of gravity of the garden hair dryer 100 is balanced in the longitudinal direction, so that the center of gravity of the whole machine is as close to the grip 32 as possible, reducing the fatigue of the user.

[0096] More specifically, if Figure 2 and Figure 3As shown, at least part of the structure of the battery pack 60 can be located below the operating handle 30, or all of it can be located behind the grip portion 32. The plug-in direction of the battery pack 60 can be set at an angle to the extension direction of the axis of the extension rod 20 and the air duct portion 10. Preferably, the angle can be 30 degrees to 60 degrees, and more preferably, the angle can be 45 degrees. Among them, the number of battery packs 60 can be one, two or more, and the garden blower selects different types and quantities of battery packs 60 according to the specific design.

[0097] The battery pack 60 in the embodiment of the present application can power at least two different types of DC tools, for example, it can be used for garden blowers 100, lawn mowers, lawn mowers, chain saws, pruning machines, angle grinders, electric hammers, electric drills and other electric tools. In this way, the user can only purchase the bare machine of the garden blower 100, and use the battery pack 60 on other existing electric tools to power the garden blower 100, thereby realizing energy sharing of multiple tools. On the one hand, it is conducive to the universality of the battery pack 60 platform; on the other hand, it also saves the purchase cost for the user. Specifically in the embodiment, the battery pack 60 can be fixed to the battery pack mounting portion by a snap-on method or a plug-in method. For example, in some embodiments, the battery pack 60 includes a slide rail portion (not numbered) on both sides thereof, a snap-on portion on the upper side thereof, and a plurality of electrode connecting sheets (not shown). The slide rail portion can be matched with the battery pack mounting portion to limit the battery pack 60 in the radial direction, and the buckle portion is buckled with the shell to limit the battery pack 60 in the axial direction, thereby stably connecting the battery pack 60 to the battery pack mounting portion.

[0098] See also Figure 4 and Figure 5The garden hair dryer 100 further includes a guide structure 80 disposed in the air duct portion 10, the guide structure 80 being located downstream of the axial flow fan 50 and being used to guide the movement of the airflow. Specifically, the guide structure 80 includes a guide cone 82, an outer cover 84 for accommodating the guide cone 82, and a stationary blade 86 located between the guide cone 82 and the outer cover 84. The guide cone 82 is arranged roughly along the moving direction of the airflow, the guide cone 82 is located at the center of the airflow channel, and the guide cone 82 includes an outer shell and a conical cavity arranged inside the outer shell. An airflow circulation space is formed between the outer shell of the guide cone 82 and the outer cover 84, and the cross section of the circulation space perpendicular to the longitudinal axis is roughly annular. The stationary blades 54 are located in the annular circulation space and are roughly distributed at intervals. The intervals between the two stationary blades 54 are for airflow circulation. Specifically in the embodiment, the stationary blades 54 are arranged obliquely relative to the moving direction of the airflow, and the angle of inclination is preferably 5 degrees to 15 degrees, and the stationary blades 54 are fixedly connected to at least one of the guide cone 82 and the outer cover 84 in the radial direction. As a preferred embodiment, the radial dimension of the guide cone 82 is smaller than the radial dimension of the motor 40 , and 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 fixedly connected to the air duct portion 10 .

[0099] The garden hair dryer 100 also includes an air inlet shield 70, which is connected to the axial air inlet 12 of the air duct portion 10. The motor 40 can drive the axial flow fan 50 to rotate around the fan axis to introduce external air from the axial air inlet 12 through the air inlet shield 70, and an air flow channel for air flow is formed between the air inlet shield 70 and the axial air outlet. Among them, in order to facilitate the cleaning of the air duct portion 10, the air inlet shield 70 and the axial air inlet 12 can be configured to be detachably connected. Specifically, the air inlet shield 70 is configured to extend in the fan axis direction of the axial flow fan 50, and one end of the air inlet shield 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 extending into the interior of the air duct portion 10, thereby causing danger, and another function is to prevent, for example, leaves or debris from entering the air duct portion 10 during the cleaning operation, thereby causing the motor 40 and the axial flow fan 50 to malfunction. In some embodiments, the air inlet shield 70 includes a plurality of shield holes 74 for air flow to pass through (see Figure 8 ), air enters the axial air inlet 12 of the air duct portion through the plurality of shield holes 74, and the sum of the ventilation areas of the plurality of shield holes 74 defines the total effective ventilation area of ​​the air inlet shield. That is, the total effective ventilation area of ​​the air inlet shield can be understood as the sum of the cross-sectional areas of the air inlet shield 70 in the direction perpendicular to the longitudinal direction through which the air can flow. In addition, the air inlet shield 70 as a whole is not arranged in a plane, for example, Figure 4 and Figure 5In the embodiment shown, the air inlet shield 70 forms an arc-shaped air inlet surface extending in the longitudinal direction. As a specific embodiment, the maximum aperture of the shield hole 74 is not greater than 7 mm, preferably, the maximum aperture of the shield hole 74 is not greater than 4 mm. In this way, it can protect the human body and prevent debris from entering the axial air inlet 12.

[0100] It should be emphasized that in the embodiment of the present application, the motor 40, the axial flow fan 50, and the guide structure 80 are arranged in the air duct portion 10, and are separated from the operating handle 30 for holding by a certain distance in the longitudinal direction. In this way, on the one hand, under the premise that the length of the garden hair dryer 100 is certain, the length of the air duct portion 10 becomes shorter. 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, and the air flows in quickly, the air flow loss is small, and a sufficient amount of air flow flows quickly under the drive of the motor 40, 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 hair dryer 100, and further reducing the weight of the garden hair dryer 100. On the other hand, the air duct portion 10 containing the core is separated from the operating handle 30, and the height dimension of the garden hair dryer 100 is also reduced, so that the volume and weight of the whole machine are reduced.

[0101] It can be understood that the performance of the garden hair dryer 100 mainly depends on the wind volume and wind speed of the product, and the wind volume and wind speed of the product are mainly determined by the blowing effect of the axial flow 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 wind volume and wind pressure of the axial flow fan 50. Taking the axial flow fan 50 as an example, the wind volume of the axial flow fan 50 is represented by the symbol Q 风 It is mainly expressed by the following formula: Q 风 =Q'×π / 4×D 2 ×V; where Q': flow coefficient, which is related to the type of the hair dryer axial flow fan 50; D: outer diameter of the axial flow fan 50; V: circumferential velocity of the outer periphery of the axial flow fan 50 (linear velocity of the blade edge). Therefore, under the same type of axial flow fan 50 (i.e., Q' is constant), and the air volume of the axial flow fan 50 remains unchanged, the linear velocity V of the blade edge of the axial flow fan 50 is inversely proportional to the diameter D of the axial flow fan.

[0102] The wind pressure of the axial flow fan 50 is the difference between the total pressure of the airflow on the outlet side and the total pressure of the airflow on the inlet side of the axial flow fan 50, which is called the wind pressure and is represented by the symbol H. It is mainly represented by the following formula: H = ρ × h × D 2 ×N 2; ρ: air density; h: pressure coefficient, generally related to the form of the axial flow fan 50; D: outer diameter of the axial flow fan 50; N: rotation speed of the axial flow fan 50. Therefore, under the same form of the axial flow fan 50 and maintaining the same wind pressure, the rotation speed of the axial flow fan 50 is roughly inversely proportional to the diameter of the axial flow fan 50.

[0103] The inventor of the present application has learned through analysis that if the motor 40 speed and the blade angle are set to a certain value, under the same air duct structure, the larger the diameter of the axial flow fan 50, the higher the air volume and wind speed can be obtained, but at the same time, the consequence is that 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 hair dryer, the diameter of the axial flow fan 50 tends to be reduced. As the diameter of the axial flow fan 50 decreases, the power consumption of the garden hair dryer 100 is gradually reduced, but at the same time, the consequence is that the air volume and wind speed of the hair dryer also generally show a trend of gradually decreasing. Therefore, while considering the power consumption, taking into account the blowing effect of the hair dryer, the axial flow fan 50 diameter, the motor 40 speed and the air duct structure need to be reasonably configured, that is, it is expected that the reasonable parameter configuration can make the wind speed and air volume meet the performance requirements, but the power consumption is within a controllable range, and the volume and mass are reduced compared to the garden hair dryer 100 in the prior art. At the same time, under the same axial flow fan 50 form, maintaining the same wind pressure, the rotation speed of the axial flow fan 50 is roughly inversely proportional to the diameter D of the axial flow fan 50, that is, under the premise of maintaining the desired air volume and wind pressure, to reduce the diameter of the axial flow fan 50, it is necessary to increase the rotation speed of the axial flow fan 50, and the rotation speed of the axial flow fan 50 is mainly determined by the motor 40. Therefore, in order to maximize the design of small volume, small diameter and light weight, the higher the speed of the motor 40, the smaller the diameter of the axial flow fan 50 can be in theory. Therefore, the motor 40 with high output power, small volume, small diameter and high speed can itself realize the lightweight of the garden hair dryer 100, and the size of the axial flow fan 50 driven by the motor 40 can also be significantly reduced, and the weight of the axial flow fan 50 is also reduced. Correspondingly, the air duct portion 10 surrounding the periphery of the axial flow fan 50 can also be designed to be smaller in size and weight than the existing garden hair dryers 100 on the market. However, the consequence is that the higher the speed of the motor 40 is, the greater the maximum output power of the motor 40 is. The nominal voltage and capacity of the battery pack 60 also need to be considered to ensure the working time of the garden hair dryer 100.

[0104] Based on the above analysis, it can be known that the fan blade angle is set to a fixed value, and the linear velocity V of the blade edge of the axial flow fan 50 is positively correlated with the rotation speed V of the axial flow fan 50 and the diameter D of the axial flow fan 50. In the embodiment of the present application, the linear velocity of the blade edge of the axial flow fan is limited to greater than 80m / s, and the total effective ventilation area of ​​the air inlet shield is limited to less than 12000mm2 Preferably, 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 shield is less than 9000 mm 2 .

[0105] In this way, the rotation speed and volume of the motor 40, the diameter of the axial flow fan 50, and the power of the motor 40 are comprehensively considered and configured with the nominal voltage and capacity of the battery pack 60, so that the small volume, small diameter, and lightweight design can be maximized. At the same time, the size of the axial air inlet 12 of the air duct section 10 and the total effective ventilation area of ​​the air inlet shield 70 affect and constrain the air volume, and also constrain and affect the size of the motor 40 and the size of the axial flow fan 50. By limiting the total effective ventilation area of ​​the air inlet shield, the pattern of "small" air inlet and "thin" air duct section is also established. While being able to achieve low power consumption, it can also meet the battery life of the DC battery pack 60, and ensure wind speed and air volume, thereby obtaining higher blowing efficiency and better blowing effect.

[0106] Specifically in the embodiment, the motor 40, the axial flow fan 50, and the air guide structure 80 of the garden hair dryer 100 are all arranged in the air duct portion 10, and the motor 40 is arranged in the upstream area between the axial air inlet 12 of the air duct portion 10 and the axial flow fan 50. In order to make the motor 40 have a high speed and a small volume, the diameter of the motor 40 is not higher than 45 mm, usually 36 mm to 45 mm, and a certain gap needs to be maintained between the motor 40 and the inner wall of the air duct portion 10 to provide sufficient air intake.

[0107] For example, the motor 40 can adopt an outer rotor brushless motor 40, which can achieve high speed while having a smaller diameter and volume. The maximum speed of the outer rotor brushless motor 40 is configured to be greater than 18000rpm and less than 40000rpm. For example, the maximum speed of the motor 40 can be 18000rpm, 25000rpm, 27000rpm, 29000rpm, 32000rpm, 35000rpm, 38000rpm. The diameter of the motor 40 is not higher than 45mm. Preferably, it can be configured between 36 and 45mm. Therefore, the diameter of the motor 40 can be set to 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm.

[0108] Further, as a preferred embodiment, 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 portion 10 is greater than 50 mm and less than 130 mm. For example, the diameter of the axial air inlet 12 of the air duct portion 10 can be 50 mm, 55 mm, 65 mm, 70 mm, 80 mm, 85 mm, 93 mm, 100 mm, 110 mm, 120 mm.

[0109] Furthermore, since the motor 40 is located in the upstream area of ​​the air duct portion 10, the motor 40 occupies a certain space and volume, and the air moves along the air duct portion 10. The upstream area of ​​the air duct portion 10 includes several wind surfaces. The wind surface is a cross-section of the upstream area of ​​the air duct portion 10 that is perpendicular to the direction of airflow movement. In order to ensure sufficient air intake, the area of ​​the smallest wind 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 that a steady stream of air can be guaranteed to contact the blades 54 of the axial flow fan 50, thereby ensuring uninterrupted blowing. Similar to the barrel theory, the amount of air supplemented to the axial flow fan 50 in the upstream area depends on the smallest wind area in the upstream area. Therefore, even if the wind area in other places in the upstream area is larger, if the area of ​​the smallest wind surface does not change, the air intake of the axial flow fan 50 will not change. Therefore, only by increasing the minimum wind area of ​​the entire upstream area can the air intake of the axial flow fan 50 be increased. From Figure 4 and Figure 5 From the perspective of the air entering the upstream area from the axial air inlet 12, since the part of the upstream area close to the axial air inlet 12 is not blocked, the wind passing area of ​​this part can be guaranteed to be larger than the rotation area of ​​the axial flow fan 50. The part surrounding the motor 40 in the upstream area is defined as the surrounding area. Due to the obstruction 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 wind passing area in 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.

[0110] In order to take into account the rotation speed of the motor 40 and the power consumption of the hair dryer, in some embodiments of the present application, the output power of the motor 40 is set to be different for different power supplies. For example, 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. In this way, not only the power and rotation speed of the motor 40 are taken into account, but also the power consumption of the hair dryer and the nominal voltage and capacity of the battery pack 60 are taken into account, so as to ensure the working time and working efficiency of the garden hair dryer 100. Within this maximum output power range, the weight of the motor 40 is in the range of 0.1-0.3kg. Therefore, the weight of the motor 40 can be set to 0.15kg, 0.25kg, 0.26kg, 0.27kg, 0.28kg, 0.29kg.

[0111] Furthermore, for different types and numbers of battery packs 60, in order to achieve better blowing performance and blowing efficiency, and further maximize the effect of the high-speed plus small axial fan 50 movement, the inventors of the present application have found that the speed, diameter, cross-sectional area of ​​the axial air inlet 12 of the motor 40 and the diameter of the axial fan 50 can be further optimized and parameterized. In some embodiments, 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, and the effective ventilation area of ​​the axial air inlet 12 is less than 9000mm 2 The outer diameter of the axial fan 50 is greater than or equal to 50 mm and less than or equal to 67 mm. Therefore, the effective ventilation area of ​​the axial air inlet 12 can be 8500 mm 2 、7500mm 2 , 7000mm 2 wait.

[0112] As a preferred embodiment, 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 diameter of the motor 40 is less than or equal to 40mm, the diameter of the axial air inlet 12 is 80mm to 100mm, and the effective ventilation area of ​​the axial air inlet is less than 6500mm 2 , the diameter of the axial flow fan 50 is 59 mm.

[0113] In other embodiments, 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, the working time of the battery pack is not less than 6min, the diameter of the motor 40 is less than or equal to 45mm, and the effective ventilation area of ​​the axial air inlet 12 is less than 13000mm 2 The outer diameter of the axial fan 50 is greater than or equal to 50 mm and less than or equal to 67 mm. Therefore, the effective ventilation area of ​​the axial air inlet 12 can be 9200 mm 2 、9800mm 2 、11000mm 2 As a preferred embodiment, 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 2Ah to 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 to 120mm, the working time of the battery pack is greater than or equal to 10min, and the effective ventilation area of ​​the axial air inlet is less than 8000mm 2 , the diameter of the axial flow fan 50 is 60 mm.

[0114] In this way, under the layout of a high-speed motor 40 plus a small axial fan 50, the motor 40, the axial fan 50 and the air duct part 10 of the garden hair dryer 100 are smaller in size, which makes the volume of the garden hair dryer 100 smaller and the weight of the whole machine lighter than the prior art, thereby improving the user experience.

[0115] In some embodiments of the present application, the extension rod 20 has a first end and a second end that are opposite to each other in the longitudinal direction, and the first end and the second end can be two opposite ends along the longitudinal extension direction of the extension rod 20. Among them, the first end can be the distal end of the extension rod 20, and the second end can 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 connected to the operating handle 30 through the second end. When the extension rod 20 is connected to the air inlet shield 70 through the first end, the orthographic projection of the first end falling on the rotating surface formed by the rotation of the axial flow fan along the longitudinal extension direction of the extension rod 20 is always located within the outer contour boundary of the rotating surface of the axial flow fan 50. 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 will not have a radial dimension overlap, and the overall shape of the garden hair dryer is regular and compact.

[0116] For example, 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, and 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 can be greater than 40mm and less than 140mm. As a preferred embodiment, the straight-line distance is greater than 128mm and less than 135mm; more preferably, the straight-line distance from the highest point of the operating handle 30 to the lowest point of the extension rod 20 is 130mm. When the garden hair dryer 100 is connected to the battery pack 60, the distance between the highest point and the lowest point can be 150mm to 170mm, preferably 159mm, and for example Figure 1 The distance from the highest point to the lowest point of the conventional garden blower connected to the battery pack 60 is 260-270 mm.

[0117] It should be understood that, since the extension rod 20 is connected within the boundary range of the outer contour of the air inlet shield 70, it inevitably occupies part of the air inlet area of ​​the air inlet shield 70. To a certain extent, the air intake of the air inlet shield 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 the radial direction should be within a reasonable range, so as to ensure the air intake of the garden hair dryer, the air flow can stably enter and flow through the fan area to form a high-speed, high-pressure airflow, and effectively ensure the performance of the garden hair dryer. In some embodiments, the air inlet shield 70 is constructed to extend on the fan axis of the axial flow fan 50, and the axial flow fan 50 rotates to form a rotating surface. The projected area of ​​the orthographic projection of the air inlet shield 70 falling on the plane where the rotating surface is located in the longitudinal direction is S1, and the projected area of ​​the orthographic projection of one end of the extension rod connected to the air inlet shield 70 falling on the plane where the rotating surface is located in the longitudinal direction is S2. Among them, the ratio of S1 to S2 is greater than or equal to 6, and less than or equal to 16. Preferably, 8≤S1 / S2≤12. In this way, the air intake requirement can be guaranteed to the greatest extent, and the end surface area of ​​the first end of the extension rod 20 connected to the axial air inlet 12 is prevented from being too large to affect the air intake volume. In a specific embodiment, 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 1256mm 2 , not less than 314mm 2 As a preferred embodiment, 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 , not less than 616mm 2It is particularly emphasized that if the cross-sectional area of ​​the extension rod 20 in the vertical longitudinal direction is too large, it will inevitably affect the air intake and the weight reduction of the whole machine, while if the cross-sectional area is too small, the reliability of the extension rod 20 will be reduced because the air duct part 10 and the battery pack 60 need to be supported by the extension rod 20 in the front and back. Therefore, setting the cross-sectional area of ​​the end of the extension rod 20 connected to the axial air inlet 12 in the vertical longitudinal direction within the aforementioned specific range can ensure the air intake and performance of the garden hair dryer while taking into account the weight reduction and reliability of the whole machine.

[0118] Furthermore, since the garden hair dryer is basically operated by the user holding the machine, for handheld instruments, the user will experience arm fatigue if holding the machine for a long time, especially for handheld instruments operated with one hand. Therefore, while achieving basically the same performance, the whole machine can be substantially compressed in volume and weight, which has always been a problem to be solved. In the aforementioned embodiment, through the clever design of the short air duct portion 10, and the cross-sectional dimensions are also reduced after the air duct portion 10 is superimposed, the whole machine has a significant change in volume and weight when both the longitudinal dimension and the radial dimension are shortened. It should be pointed out that one end of 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 inlet shield 70 will affect the radial dimension of the whole machine, wherein one end of the air inlet shield 70 is connected to the axial air inlet 12 of the air duct portion 10, so the cross-sectional dimension of the air duct portion 10 is reduced, and the cross-sectional dimension of the air inlet shield 70 is also inevitably reduced, which is conducive to reducing the size of the whole machine. Specifically, in some embodiments, in the direction perpendicular to the longitudinal direction, the cross-sectional area of ​​the end of the air inlet shield 70 connected to the axial air inlet 12 is less than 13300 mm. 2 Preferably, in the direction perpendicular to the longitudinal direction, the cross-sectional area of ​​the end of the air inlet shield 70 connected to the axial air inlet 12 is not less than 3800 mm 2 , not more than 11300mm 2 .

[0119] In one embodiment, the air inlet shield 70 is approximately arc-shaped, with a diameter of 110 mm, and the cross-sectional area of ​​the extension rod 20 in the radial direction is 907 mm. 2 , that is, the ratio of the projection area S1 of the orthographic projection of the air inlet shield 70 falling on the plane where the rotating surface is located in the longitudinal direction to the projection area S2 of the orthographic projection of one end of the extension rod 20 connected to the air inlet shield 70 falling on the plane where the rotating surface is located in the longitudinal direction is about 10.47. Further, the extension distance of the air inlet shield 70 on the fan axis of the axial flow fan 50 is not less than 62 mm. In this way, the air intake of the garden hair dryer is further guaranteed, thereby meeting the performance requirements of the garden hair dryer.

[0120] Figure 7A cross-sectional schematic diagram showing the position of the air inlet shield of a garden hair dryer in an embodiment of the present application in a first working state; Figure 8 Shows Figure 7 The cross-sectional schematic diagram of the air inlet shield of the garden hair dryer shown is taken along the BB direction.

[0121] For the layout of the "thin" air duct, it is necessary to consider that the connection and fixing structure between the air inlet shield 70 and the extension rod 20 should not block the air inlet as much as possible, so as to further reduce the loss of air inlet volume. Figure 7-Figure 8 The air inlet shield 70 is provided with a plug-in portion 72 extending a preset distance in the longitudinal direction, and shield holes 74 are circumferentially distributed on the periphery of the plug-in portion. The garden hair dryer also includes a first connection structure (not marked in the figure), and the first end of the extension rod 20 is connected to the plug-in portion 72 of the air inlet shield 70 through the first connection structure. Among them, the orthographic projection of the first connection structure falling on the plane where the rotating surface of the axial fan 50 is located along the extension direction of the extension rod 20 and the orthographic projection of the shield hole 74 falling on the plane where the rotating surface is located along the extension direction of the extension rod 20 basically do not overlap. On the whole, the first connection structure is located in the inner circle of the air inlet shield 70, and the shield hole 74 is located on the periphery of the plug-in portion 70. The two do not interfere with each other and do not block each other. Therefore, when the air inlet shield 70 is connected to the extension rod 20, the first connection structure will not occupy the area of ​​the shield hole 74, thereby not affecting the air intake. Specifically, as Figure 8 In the illustrated embodiment, the cross section of the plug-in portion 72 along a direction perpendicular to the longitudinal extension direction of the extension rod 20 is elliptical. In some other embodiments, it may also be circular or square, which is not limited here.

[0122] It should be noted that the orthographic projection of the first connecting structure along the extension direction of the extension rod 20 falling on the plane where the rotating surface of the axial fan 50 is located is basically not overlapped with the orthographic projection of the shield hole 74 along the extension direction of the extension rod 20 falling on the plane where the rotating surface is located. Basically not overlapping here means that the maximum straight line dimension of the projection of the first connecting 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 are separated, tangent or intersected within a range of 5mm. Further, taking the fixing method of screwing as an example, the screw is inserted from the outer edge of the air inlet shield 70 and connected to the extension rod 20. In this way, the screw occupies a large size in the radial direction, so that the maximum straight line dimension of the projection of the first connecting 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 5mm. In this way, part of the air inlet area is sacrificed, and the installation steps are more complicated. Therefore, in the fixing method of screwing, the orthographic projection of the first connecting structure along the extension direction of the extension rod 20 falling on the plane where the rotating surface of the axial fan 50 is located and the orthographic projection of the shield hole 74 along the extension direction of the extension rod 20 falling on the plane where the rotating surface is located do not fall into the aforementioned defined situation of "basically not overlapping".

[0123] In some embodiments, the plug-in portion 72 is configured as a hollow plug-in channel, and the first end of the extension rod 20 is plugged and locked into the plug-in portion 72 to achieve a locked connection between the two. In other embodiments, the plug-in portion 72 on the air inlet shield 70 can also be configured to be inserted and locked in 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 in the longitudinal direction, so that the joint area between the extension rod 20 and the air inlet shield 70 is increased, thereby improving the connection strength between the extension rod 20 and the air inlet shield 70. For example, in an embodiment where the plug-in portion 72 is configured as a hollow plug-in channel, since the plug-in portion 72 has a certain extension length in the longitudinal direction, the extension rod 20 can be wrapped along the circumference of the extension rod 20, so that the connection strength and stability between the extension rod 20 and the air inlet shield 70 are better.

[0124] Fig. 9 A schematic diagram showing the matching relationship between the positioning member of the extension rod and the air inlet shield when the positioning member of the extension rod in one embodiment of the present application is in a locked state; Fig.10 Show Fig. 9 The schematic diagram of the structure of the extension rod is shown when the positioning piece of the extension rod is in a natural state.

[0125] In some embodiments, such as 9- Fig.10 As shown, the first connection structure includes a matching piece arranged on the extension rod 20 and a locking piece arranged on the plug-in channel. The locking piece can be defined as a positioning hole 76 on the inner wall of the plug-in portion, and the matching piece can be a shape-adjustable positioning piece 22 arranged on the outer wall near the first end of the extension rod 20 or on the first end of the extension rod 20. The positioning piece 22 has a locking 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 piece 22 radially exceeds the outer contour of the inner wall surface of the positioning hole 76 to limit the extension rod 20 from slipping out backwards from the plug-in channel. Specifically in some embodiments, the positioning piece 22 has a natural state in which its shape is maintained when inserted into the plug-in channel (see Fig.10 ), and a locked state that changes its shape when subjected to external forces (see Fig. 9 ). In the natural state, the positioning member 22 is in a preset position corresponding to the positioning hole 76. In the locked state, the outer contour of the positioning member 22 radially exceeds the outer contour of the inner wall of the positioning hole 76 to limit the extension rod 20 from slipping out backward from the insertion channel.

[0126] Specifically, the inner wall of the plug-in portion 72 is provided with a plurality of positioning holes 76, and the plurality of positioning holes 76 are spaced apart in the circumferential direction of the plug-in 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, when it is switched from a natural state to a locked state, the operator needs to use an auxiliary member to push the positioning member 22 outward, so that the positioning member 22 changes its shape and opens outward. When the positioning member 22 is an elastic structure, when it is switched from a natural state to a locked state, the positioning member 22 releases the accumulated elastic potential energy, so that the positioning member 22 changes its shape and opens outward.

[0127] It should be emphasized that after the air inlet shield 70 and the extension rod 20 are connected, the first connection structure is located in the interior of the air inlet shield 70. The stability of the first connection structure is ensured by accommodating the first connection structure in the air inlet shield 70. When the extension rod 20 is engaged with the air inlet shield 70, the positioning member 22 of the extension rod 20 is switched from a natural state to a locked state in the positioning hole 76 to prevent the extension rod 20 from coming out of the insertion channel.

[0128] In other embodiments, the mating piece can also be defined as a groove recessed from the wall surface of the extension rod 20, and the groove can be an opening that passes through the inside and outside, or it can be a semi-closed groove. The locking piece can be defined as a protrusion protruding inward from the inner wall surface of the plug-in portion 22 or the end edge of the plug-in portion 72, and the protrusion can be a buckle. When the plug-in portion 72 is inserted and coupled to the inner cavity of the extension rod 20, the air inlet shield 70 and the extension rod 20 can form a locking fit with the protrusion through the above-mentioned groove.

[0129] In some embodiments, the plug-in portion 72 has an open end for inserting the extension rod 20, and the open end can be necked inward to form a necked structure, and the maximum outer contour dimension of the open end is greater than the maximum outer contour dimension of the extension rod 20 at the positioning member 22. 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, without using a large external force to connect the first end of the extension rod 20 to the plug-in portion 72.

[0130] In some embodiments, Fig. 9As shown, the first connection structure also includes a stopper 78 disposed at the end of the plug-in portion 72, and the stopper 78 can abut against the end of the extension rod 20 to prevent the extension rod 20 from moving forward from the plug-in channel of the plug-in portion 72. Specifically, the stopper 78 is a stopper block protruding toward the plug-in channel. When the positioning member 22 is in a locked state, the first end of the extension rod 20 abuts against the stopper 78, and the first end of the extension rod 20 is limited between the positioning hole 76 and the stopper 78 to prevent the extension rod 20 from jumping in the axial direction of the plug-in channel. When the positioning member 22 of the extension rod 20 is engaged with the positioning hole 76, the first end of the extension rod 20 can simultaneously abut against the stopper 78 to achieve axial positioning.

[0131] In some embodiments, Fig.10 As shown, 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, and the distance between the hole 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. In this embodiment, the positioning member 22 can be formed on the extension rod 20 by stamping, and the manufacturing method is relatively simple, and no other materials are required, and the cost is lower.

[0132] It can be understood that the extension rod 20 not only serves to connect the operating handle 30 and the air duct portion 10, but also serves to provide support. Therefore, the support material of the extension rod 20 needs to have a certain strength. In some preferred embodiments, the extension rod 20 is made of aluminum tube material, which not only has a certain support strength, but also is lighter and more portable. Preferably, the wall thickness of the extension rod 20 is 1 to 2 mm, and has a smaller volume.

[0133] On the one hand, since the first end of the extension rod 20 occupies the effective ventilation area of ​​the air inlet shield 70, the air inlet shield 70 sacrifices a part of the air inlet area. On the other hand, due to the layout of the "thin" air duct, it is bound to have a greater impact on the air intake volume of the hair dryer. In order to compensate for the loss caused by the above structural design, the extension rod 20 can be used to deliver auxiliary airflow. Specifically, Fig. 9 and Fig.10 As shown, the extension rod 20 may be generally in a hollow tubular structure, having an auxiliary air duct (not shown), an air flow inlet connected to the auxiliary air duct, and an air flow outlet 24. The air flow outlet 24 is connected to the air duct portion 10, the air flow inlet is connected to the external air flow, and an auxiliary air flow is formed through the auxiliary air duct, and the auxiliary air flow converges with the main air flow entering through the shield hole 74 at the axial flow fan.

[0134] In some embodiments, the air flow outlet 24 may be provided near the first end, for example, may be provided at the lower part of the first end, or may be provided directly at the end of the first end, that is, the first end is open, and is used to connect the auxiliary air duct with the air duct portion 10, so that the airflow in the auxiliary air duct can enter the air duct portion 10 through the air flow outlet 24. The air flow inlet may be provided near the second end and located at the outer part of the extension rod 10 placed on the operating handle, or the air flow inlet may be provided near the second end and located at the inner part of the extension rod 20 placed on the operating handle 30, or the air flow inlet may be provided at the end of the second end, that is, the second end is open. Specifically in the embodiment, when the air flow inlet is located at the end of the second end or at the inner part of the extension rod 20 placed on the operating handle 30, in order to introduce external airflow into the auxiliary air duct of the extension rod 20, a secondary air inlet 36 (see Figure 7 ), the secondary air inlet 36 is used to connect the external airflow and the auxiliary air duct. When the motor 40 is running, a negative pressure area is generated near the first end of the extension rod 20, so that the external air can be sucked into the auxiliary air duct of the extension rod 20 through the airflow inlet, and an auxiliary airflow is formed in the extension rod 20.

[0135] Furthermore, in order to ensure that the garden hair dryer reaches a certain blowing force and meets the performance requirements, and the radial size of the garden hair dryer is smaller and the whole machine is more compact, it is necessary to increase the wind speed of the garden hair dryer. The main blowing port 14 of the main blowing pipe 11 of the present application has a smaller cross-sectional area in the direction perpendicular to the longitudinal direction, which can pressurize the incoming air flow to form a higher wind speed. For example, the cross-sectional area of ​​the main blowing port 14 of the main blowing pipe 11 in the direction perpendicular to the longitudinal direction is less than 4000mm 2 However, since the radial dimension of the main blowing pipe 11 is relatively small, the axial air inlet 12 and the main blowing outlet 14 will both limit the air volume. In order to compensate for the air volume, in some embodiments, the air duct portion 10 includes the main blowing pipe 11 and an auxiliary blowing pipe 13 connected to 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.

[0136] In some embodiments, the garden hair dryer can switch between a first working mode in which air is exhausted at a relatively high wind speed and a relatively low air volume and a second working mode in which air is exhausted at a relatively low wind speed and a relatively high air volume through the auxiliary blow pipe 13. Specifically, the main blow pipe 11 is fluidically connected to the auxiliary blow pipe 13, and the main blow pipe 11 is supported at the distal end of the extension rod 20. There is the aforementioned gap between the main blow pipe 11 and the auxiliary blow pipe 13, so that external air can enter the auxiliary blow pipe 13 through the gap, thereby increasing the air volume of the garden hair dryer 100. The proximal end of the main blow pipe 11 is provided with the axial air inlet 12, and the distal end of the main blow pipe 11 is provided with a main blow port 14 (see Figure 4 ), the auxiliary blowing pipe 13 has an auxiliary air inlet connected to the main blowing port 14 and a pipe opening located at the far end of the auxiliary air inlet in the longitudinal direction, and the pipe opening forms an air outlet. The auxiliary air inlet at least surrounds part of the main blowing port 14, and 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 above-mentioned gap for external air to flow into the auxiliary blowing pipe 13 is formed between the inner circle of the auxiliary air inlet and the outer circle of the main blowing port 14. Through the setting of the auxiliary blowing pipe 13, when the garden hair dryer 100 has a high wind speed, the blowing volume of the garden hair dryer 100 can also meet the demand.

[0137] Further, the auxiliary blow pipe 13 is movably connected to the main blow pipe 11 so that the garden hair dryer can switch between the first working mode and the second working mode. It should be noted that the movably connected can be understood as the auxiliary blow pipe 13 can be detachably separated from the main blow pipe 11, and the auxiliary blow pipe 13 can be retracted backward by a preset distance or extended forward so that the garden hair dryer 100 can switch between the first working mode and the second working mode. Specifically, the garden hair dryer 100 is in the first working mode, and the outside air enters from the axial air inlet 12 and is blown out from the main blow port 14; the garden hair dryer 100 is in the second working mode, and the outside air enters from the axial air inlet 12 and is blown out from the nozzle of the auxiliary blow pipe 13. The user can freely choose to work in the first working mode or the second working mode according to the cleaning needs, and the user can choose a matching mode to work according to different working conditions. For example, when it is necessary to clean courtyards, parks, streets and other places covered with fallen leaves, the user can choose the second working mode with relatively large wind volume and relatively small wind speed to quickly gather the fallen leaves in the cleaning area within a unit time; if it is necessary to clean wet leaves stuck to the ground, the user can choose the first working mode with relatively small wind volume and relatively high wind speed to quickly peel foreign objects off the ground with sufficient force.

[0138] It should be noted that when the garden hair dryer is in the first working mode, the axial air outlet of the garden hair dryer 100 is the main air outlet 14 of the main air pipe 11. When the garden hair dryer is in the second working mode, the axial air outlet of the garden hair dryer 100 is the air outlet of the auxiliary air pipe.

[0139] In order to maximize the increase in the amount of air flowing into the auxiliary blowing pipe 13 through the gap, the auxiliary air inlet is an outwardly expanded trumpet shape, and the cross-sectional area of ​​the auxiliary air inlet in the direction perpendicular to the longitudinal direction is greater than the cross-sectional area of ​​its outlet. Due to the increase in the cross-sectional area of ​​the auxiliary air inlet, the wind speed of the airflow flowing into the auxiliary blowing pipe 13 at the front end of the auxiliary air inlet is naturally reduced. In some embodiments, the auxiliary blowing pipe 13 is configured into a cone shape to compress the airflow entering the auxiliary blowing pipe 13 and increase the wind speed again. In addition, considering that the cross-sectional area of ​​the outlet of the auxiliary blowing pipe 13 cannot be configured too small, an outlet of too small size will affect the air volume. Specifically, the ratio of the cross-sectional area of ​​the outlet of the auxiliary blowing pipe 13 in the direction perpendicular to the longitudinal direction to the cross-sectional area of ​​the main blowing port 14 is between 2 and 3.5. Specifically in the embodiment, the angle formed by the outer wall of the auxiliary blowing pipe 13 and the fan axis is about 3 degrees to 9 degrees. In order to achieve the wind pressure in the auxiliary blowing pipe 13 without affecting the air volume.

[0140] It should also be understood that the air entering the air duct portion 10 from the axial air inlet 12 is gathered into a high-speed moving airflow under the rotation of the axial flow fan 50, and diffuses from the axial air inlet 12 to the main air outlet 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 outside the high-speed area. In order to maximize the amount of air flowing into the main air blow pipe 11, the cross-sectional area of ​​the axial air inlet 12 is designed to be larger, and during the process of the airflow flowing to the main air outlet 14, the cross-sectional area of ​​the downstream area remains basically unchanged. On the one hand, in order to maximize the flow rate of the airflow to maintain a high level, the cross-sectional area of ​​the main air outlet 14 is smaller than the cross-sectional area of ​​the axial air inlet 12. On the other hand, when the auxiliary blowing pipe 13 is working, due to the increase in the cross-sectional area of ​​the auxiliary air inlet, the airflow flowing into the auxiliary blowing pipe 13 naturally decreases at the front end of the auxiliary air inlet, and mixes with the low-speed airflow, but if the high-speed airflow and the low-speed airflow are not mixed evenly, the blowing effect will also be affected. 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 affect the final outlet wind speed. If the cross-sectional area of ​​the axial air inlet 12 is too large, the cross-sectional area of ​​the main air outlet 14 or the auxiliary blowing pipe 13 is too small, it is not conducive to the formation of stable and high-speed airflow. In some embodiments of the present application, 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 rate of the airflow is maintained at a high level, and in the second working mode, there will be no uneven mixing with the low-speed airflow, avoiding airflow turbulence, ensuring the length and cross-sectional area of ​​the high-speed airflow from the axial air outlet, and further improving the blowing effect of the garden hair dryer 100.

[0141] like Figure 4-Figure 5As shown, in some embodiments, the main blowing pipe 11 is provided with a first slot 112 and a second slot 114 spaced apart along its axial direction, and the auxiliary blowing pipe 13 is provided with a limiting portion 134 adapted to the first slot 112 and the second slot 114. Among them, the first slot 112 is closer to the axial fan 50 and the motor 40 than the second slot 114. When the limiting portion 134 is engaged with the first slot 112, the main blowing port 14 is exposed, and the outside air enters from the axial air inlet 12 and is blown out from the main blowing port 14, and the garden hair dryer is in the first working mode. When the limiting portion 134 is engaged with the second slot 114, the main blowing port 14 is hidden in the auxiliary blowing pipe 13, and the outside air enters from the axial air inlet 12 and is blown out from the pipe mouth of the auxiliary blowing pipe 13, and the garden hair dryer is in the second working mode. Specifically, in one embodiment, the main blowing pipe 11 is also provided with a guide rail (not marked in the figure) along its axial direction, 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. The limiting portion 134 has a clamping end for matching with the first clamping slot 112 and the second clamping slot 114 and a pressing end for contacting and pressing. An elastic member 136 is also provided between the pressing end and the main blowing pipe 11, and the clamping end and the pressing end are constructed to form two ends of a lever. When the pressing end is contacted and pressed, the elastic member 136 is compressed, and the clamping portion can be disengaged from the first clamping slot 112 or the second clamping slot 114. When the pressing end is released, the elastic member 136 recovers its deformation, forcing the clamping end to be clamped into the first clamping slot 112 or the second clamping slot 114, thereby realizing the axial limit between the auxiliary blowing pipe 13 and the main blowing pipe 11.

[0142] For example, in some embodiments, 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 weight of the garden hair dryer 100 when not connected to the battery pack 60 does not exceed 1.8kg, preferably does not exceed 1.5kg, the maximum wind speed of the garden hair dryer 100 in the first working mode is between 90mph and 110mph, the maximum air volume of the garden hair dryer 100 in the second working mode is between 350cfm and 500cfm, and the working time of the battery pack is not less than 6min. Specifically, 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, and the weight of the hair dryer when not connected to the battery pack 60 does not exceed 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, and the working time of the battery pack is not less than 10 minutes.

[0143] In other embodiments, 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 weight of the garden hair dryer 100 when not connected to a power source does not exceed 2kg, preferably does not exceed 1.8kg, the maximum wind speed of the garden hair dryer 100 in the first working mode is between 110mph and 180mph, the maximum air volume of the garden hair dryer 100 in the second working mode is between 420cfm and 650cfm, and the working time of the battery pack is not less than 6min. Specifically, the garden hair dryer includes a first battery pack and a second battery pack for powering the motor 40, the nominal output voltages of the first battery pack and the second battery pack are both 20V, the capacity of the battery pack is 4Ah, the weight of the hair dryer when not connected to the battery pack does not exceed 1.8kg, and the maximum 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 wind volume in the second working mode is between 480cfm and 630cfm, and the working time of the battery pack is not less than 10 minutes. Among them, in the prior art, the weight of the garden hair dryer 100 with similar performance is relatively heavy, while the garden hair dryer in the embodiment of the present application effectively improves the user experience while meeting the requirements of wind volume and wind speed performance.

[0144] Compared with the traditional hair dryer, 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. Specifically, the ratio of the length of the air duct portion 10 in the longitudinal direction to the length of the garden hair dryer 100 in the longitudinal direction is less than or equal to 70%, and the maximum speed of the motor is configured to be greater than or equal to 18000rpm and less than or equal to 40000rpm. Preferably, the ratio of the length of the air duct portion 10 in the longitudinal direction to the length of the garden hair dryer 100 in the longitudinal direction is less than or equal to 65%, and the maximum speed of the motor is configured to be greater than or equal to 18000rpm and less than 38000rpm. Specifically, the length of the whole machine is 850mm~1000mm, the air duct portion 10 is linear, and the length of the air duct portion 10 is not more than 600mm. Therefore, the length of the air duct portion can be 600mm, 580mm, 560mm, 540mm, 520mm, 500mm, 480mm, 460mm, 440mm, etc. Preferably, the length of the air duct portion 10 is between 440mm and 560mm.

[0145] Specifically in some embodiments, 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, and the length of the air duct portion is less than or equal to 600mm, specifically 450mm; when the nominal output voltage of a single battery pack is greater than 20V and less than 56V, the maximum speed of the motor is between 20000rpm and 38000rpm, and the length of the air duct portion is less than or equal to 570mm, specifically 500mm; the longitudinal length of the garden hair dryer 100 is generally not less than 750mm, therefore, the longitudinal length of the garden hair dryer 100 can be 850mm, 880mm, 920mm, 950mm, 989mm.

[0146] In the present application, the length of the air duct portion 10 is shortened, which can reduce the wind speed attenuation, so the length of the main blowing pipe 11 must be reduced. Specifically, the length of the main blowing pipe 11 can be configured to be no more than 450mm. Specifically in the embodiment, when 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 more than 20V, and the capacity of a single battery pack is 2Ah~5Ah; the number of battery packs is 1, or the number of battery packs is 2, and the two battery packs are connected in series or in parallel. The maximum 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, and specifically can be 350mm. When 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, and the capacity of a single battery pack is 4Ah, the number of battery packs is 2, and the two battery packs are connected in series or in parallel. The maximum rotation speed of the motor is between 20000 rpm and 38000 rpm, and the length of the main blowing pipe 11 is less than or equal to 420 mm, and specifically can be 380 mm.

[0147] It should be understood that when the longitudinal length of the auxiliary blowing pipe 13 is too long, the airflow loss is bound to be large, and it is impossible to maintain the high-speed wake zone formed by the airflow flowing out of its air outlet with an ideal length, and it is impossible to ensure that the cross-sectional area of ​​the high-speed wake zone is large. Of course, if the length of the auxiliary blowing pipe 13 in the longitudinal direction is too short, the high-speed zone airflow and the low-speed zone airflow entering the auxiliary blowing pipe 13 from the auxiliary air inlet are mixed unevenly, and the airflow is turbulent, which affects the air outlet effect of the auxiliary blowing pipe 13. Therefore, in some embodiments, the length of the auxiliary blowing pipe 13 in the longitudinal direction is set between 100 and 160 mm. Preferably, as in the aforementioned embodiment, the length of the auxiliary blowing pipe 13 is between 110 mm and 140 mm.

[0148] It is particularly pointed out that the garden hair dryer as a whole forms a lever structure with the user's grip as the fulcrum, and the two ends of the lever structure are respectively the battery pack 60 and the movement including the air inlet shield 70 and the air duct part 10. Specifically, the elements connected to the far end of the extension rod 20 are positioned as the first weight unit (including the air inlet shield 70, the motor 40, the axial fan 50, the guide structure 80 (including the guide cone 82, the static blade 54) and the outer shell surrounding these elements), and the elements connected to the proximal end of the extension rod 20 are defined as the second weight unit (the operating handle 30 and the battery pack 60). In order to reduce the weight of the garden hair dryer 100, it is necessary to reduce the weight of the above-mentioned weight units as much as possible, among which the first weight unit and the second weight unit have a greater influence on the center of gravity of the garden hair dryer. It is necessary to ensure that the center of gravity of the garden hair dryer 100 after connecting the battery pack 60 is close to the operating handle 30 to improve the user's operating experience.

[0149] Fig.11 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 garden hair dryer in another embodiment of the present application is shown; Fig.12 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 entire garden hair dryer in yet another embodiment of the present application is shown.

[0150] See also Fig.11 In some embodiments, the battery pack 60 includes a first battery pack and a second battery pack matched with the battery pack mounting portion. For example, the nominal output voltage of the first battery pack and the second battery pack are both 20V, the capacity is 5Ah, and the total weight of the first battery pack and the second battery pack is about 1.2-1.4kg. At this time, 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 backward. Among them, the ratio of the weight of the second weight unit to the total weight of the garden hair dryer 100 equipped with the battery pack 60 is not greater than 0.5. The weight ratio of the second weight unit to the first weight unit does not exceed 2.5. Preferably, the weight ratio of the second weight unit to the first weight unit does not exceed 2.3 and is not less than 1.05. For example, after the whole machine is miniaturized, the weight of the second weight unit is 1.96kg and the weight of the second weight unit is 0.88kg.

[0151] In the longitudinal extension direction of the extension rod 20, the orthographic projection of the center of gravity of the garden hair dryer combined with the battery pack 60 on the plane perpendicular to the rotation plane of the axial flow fan 50 is G', and the orthographic projection of the front end of the control switch 34 close to the extension rod 20 on the plane perpendicular to the rotation plane of the axial flow fan 50 is K', and the orthographic projection G' is configured to be within a range of 70 mm forward and backward from the orthographic projection K'. Preferably, the orthographic projection G' of the center of gravity of the whole machine on the plane perpendicular to the rotation plane of the axial flow fan 50 is located 35 mm forward of the projection K'. By installing the battery pack 60 on the rear side of the whole machine, the position of the center of gravity G' of the garden hair dryer is balanced (the center of gravity G' here is understood to be the projection of the center of gravity of the whole machine in the state of being equipped with the battery pack), and because the garden hair dryer in this embodiment itself has a low weight, in terms of weight, it has greatly reduced the fatigue of the user holding the machine.

[0152] The distance between the orthographic projection of the center of gravity M of the first weight unit on the plane perpendicular to the rotation plane of the axial flow fan 50 and the orthographic projection G' is L1, and the distance between the orthographic projection of the center of gravity J of the second weight unit on the plane perpendicular to the rotation plane of the axial flow fan 50 and the orthographic projection G' is L2. In the longitudinal extension direction of the extension rod 20, the distance L2 is in the range of 40% to 60% of the distance L1. The length of the extension rod 20 exposed to the outside is configured to be in the range of 110 to 135 mm, and the longitudinal length of the first weight unit is between 480 mm and 650 mm.

[0153] The length of the extension rod 20 exposed to the outside is the length of the extension rod 20 minus the length of the portion connected to the air inlet shield 70 and the operating handle 30. In this way, the overall length of the air duct portion 10 connected to the distal end of the extension rod 20 is shorter. In this way, 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. When 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, and the miniaturization of the whole machine is achieved.

[0154] In this case, when the battery pack 60 is connected to the battery pack mounting portion, the ratio of the longitudinal distance between the center of gravity of the garden hair dryer 100 equipped with the battery pack 60 and the front end edge of the axial air outlet 12 to the longitudinal length of the garden hair dryer 100 is not less than 0.75. Preferably, the ratio of the longitudinal distance between the center of gravity of the garden hair dryer 100 equipped with the battery pack 60 and the front end edge of the axial air outlet 12 to the longitudinal length of the garden hair dryer 100 is not less than 0.8. Specifically in the embodiment, the first battery pack and the second battery pack are arranged near the operating handle 30, and the projection of the center of gravity of the garden hair dryer 100 equipped with the first battery pack and the second battery pack on the extension rod 20 is located within the projection range of the operating handle 30 on the extension rod 20. In this way, when the garden hair dryer 100 is connected with the battery pack 60, the reasonable configuration of the battery pack 60 can, on the one hand, adjust the center of gravity G' of the whole machine and improve the comfort of the handheld mode, and on the other hand, maintain the running time of the machine. In this embodiment, the configuration of the two battery packs 60 can maintain the machine running time greater than or equal to 8 minutes. In order to avoid increasing the longitudinal length of the garden hair dryer 100 , the battery pack installation portion is located below the operating handle 30 , and the projections of the battery pack installation portion and the operating handle 30 on the extension rod 20 at least partially overlap.

[0155] In other embodiments, Fig.12 As shown, the battery pack mounting portion is arranged at the proximal end near the extension rod 20, the number of battery packs for powering the motor 40 can be one, the nominal output voltage of the battery pack is less than or equal to 20V, the capacity of the battery pack is 2Ah to 9Ah, and the maximum speed of the motor 40 is between 18000rpm and 35000rpm. The weight of the garden hair dryer when not connected to the battery pack does not exceed 1.8kg, and the maximum wind speed in the first working mode is between 90mph and 110mph, and the maximum wind volume in the second working mode is between 350cfm and 500cfm, and the working time of the battery pack is not less than 8min. In the longitudinal extension direction of the extension rod 20, the orthographic projection of the center of gravity of the garden hair dryer combined with the battery pack on the plane perpendicular to the rotation plane of the axial flow fan 50 is G', and the orthographic projection of the front end of the control switch 34 near the extension rod on the plane perpendicular to the rotation plane of the axial flow fan is K', and the orthographic projection G' is configured to be within a range of 100 mm from the orthographic projection K' to the front and back. Preferably, the weight of the hair dryer when not connected to the battery pack does not exceed 1.5 kg, and the projection G' is configured to be within a range of 50 mm from the front and back of the projection K'. By installing the battery pack on the rear side of the whole machine, the position of the center of gravity G' of the hair dryer is balanced (the center of gravity G' here is understood to be the projection of the center of gravity of the whole machine when equipped with the battery pack), and because the hair dryer in this embodiment itself has a low weight, in terms of weight, it has greatly reduced the fatigue of the user holding the machine.

[0156] Furthermore, in order to make the center of gravity of the whole machine as close to the operating handle 30 as possible, on the one hand, the weight of the core part is reduced and the operating comfort of the whole machine is adjusted, and on the other hand, the length of the extension rod 20 is reduced, shortening the arm of force between the core and the control switch 34. However, when the length of the exposed extension rod 20 is too short, it is bound to cause the overall length of the air duct part 10 connected to the extension rod 20 to be longer. The increase of the air duct part 10 will affect the miniaturization of the whole machine. In addition, the longer the air duct part 10 is, the greater the air flow loss is, which affects the performance of the whole machine.

[0157] Furthermore, Fig.12 As shown, 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 flow fan 50 and the projection G' is L1, the distance between the projection of the center of gravity of the second weight unit J on the plane perpendicular to the rotating surface of the axial flow fan 50 and the projection G' is L2, and in the longitudinal extension direction of the extension rod 20, the distance L2 is in the range of 60% to 80% of the distance L1, the length of the extension rod 20 exposed to the outside is configured to be in the range of 100 to 140 mm, and the longitudinal length of the first weight unit is between 420 mm and 560 mm.

[0158] It should be noted that the distance L1 and the distance L2 are the distances between the orthographic projections of the hair dryer on a plane perpendicular to the rotating surface when the hair dryer is in a horizontal state.

[0159] In an embodiment of the present application, the battery pack can be adapted to be connected to at least two different types of hand-held tools, such as a lawn mower, a chain saw, a lawn mower, a hair dryer, a blower and a vacuum cleaner, an electric drill, an electric saw, a pruner, a pressure washer and other battery-powered hand-held tools, and the weight of the second weight unit is not greater than 140% of the first weight unit and not less than 105% of the first weight unit. For example, after the whole machine is miniaturized, the weight of the first weight unit is about 0.7 kg, and the weight of the second weight unit is about 0.94 kg.

[0160] like Figure 1 As shown, an axial air inlet 12 of a garden hair dryer 100 in the prior art is arranged around the rearmost end of the garden hair dryer 100, and the operating handle 30 and / or the battery pack 60 are supported above the air duct portion 10, and the length of the air duct portion 10 in the longitudinal direction is substantially equal to the length of the garden hair dryer 100 in the longitudinal direction, and the length of the garden hair dryer 100 is generally between 800 and 900 mm; another garden hair dryer 100 in the prior art, the battery pack mounting portion is arranged at the rear end of the air duct portion 10 (not shown), and the air duct portion 10 is at least formed with an axial air inlet 12 at the side and bottom for the outside air to flow into the air duct portion 10. The ratio of the length of the air duct portion 10 to the length of the garden hair dryer 100 in the longitudinal direction is not less than 3 / 4. The above two garden hair dryers 100 cannot make the performance of the motor 40 be utilized to the best, and the air volume and wind speed of the fan are also taken into account.

[0161] The inventor of the present application has found that the size of the air inlet shield 70 and the axial air inlet 12 of the air duct portion 10 affects and constrains the size of the motor 40 and the size of the axial flow fan 50, and is closely related to the wind speed and air volume of the garden hair dryer 100. The length of the air duct portion 10 and the entire machine also affects whether the airflow can flow quickly, which is ultimately fed back to the wind speed and air volume of the garden hair dryer 100. Therefore, when the air volume and wind speed are predetermined values, the maximum height H and maximum width W of the air inlet shield 70, and the length L of the garden hair dryer 100 also affect whether the performance of the motor 40 can be maximized. In some embodiments, the maximum height of the air inlet shield 70 is H, and the maximum width of the air inlet shield 70 is W, wherein the ratio of the maximum height H of the air inlet shield 70 to the length of the whole machine L is less than 0.15, and the ratio of the maximum width W of the air inlet shield 70 to the length of the whole machine L is less than 0.15. The air volume provided by the garden hair dryer is greater than or equal to 350cfm and less than or equal to 650cfm, and the wind speed provided is greater than or equal to 70mph and less than 185mph. In this way, the blowing performance and blowing efficiency of the garden hair dryer can be better, and the effect of the high speed plus the small axial flow fan 50 movement can be further maximized. Specifically in some embodiments, the maximum height H of the air inlet shield 70 is greater than 80mm and less than 130mm; the maximum width W of the air inlet shield 70 is greater than 80mm and less than 130mm; the overall length L of the garden hair dryer is between 850mm and 1000mm.

[0162] For example, the nominal output voltage of the battery pack 60 is less than 20V, the capacity of the battery pack 60 is between 2 and 9Ah, the maximum speed of the motor 40 is between 18000rpm and 35000rpm, the ratio of the maximum height of the air inlet shield 70 to the overall length of the garden hair dryer is between 0.09 and 0.133, and the ratio of the maximum width of the air inlet shield 70 to the overall length of the garden hair dryer is between 0.09 and 0.133, the maximum wind speed of the garden hair dryer is between 90mph and 110mph, and the maximum air volume of the garden hair dryer is between 350cfm and 500cfm. In other embodiments, 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 speed of the motor 40 is between 20000rpm and 38000rpm, the ratio of the maximum height of the air inlet shield 70 to the overall length of the garden hair dryer is between 0.11 and 0.16, and the ratio of the maximum width of the air inlet shield 70 to the overall length of the garden hair dryer is between 0.11 and 0.16, the maximum wind speed of the garden hair dryer is between 110mph and 160mph, and the maximum wind volume of the garden hair dryer is between 420cfm and 650cfm. In this way, the performance of the motor 40 can be utilized to the best, and the wind volume and wind speed of the hair dryer can reach a better level.

[0163] In the garden hair dryer 100, the core composed of the motor 40, the axial flow fan 50 and the guide structure 80 is arranged in the air duct part 10 and is longitudinally separated from the operating handle 30 for holding. On the one hand, the length of the air duct part 10 is shortened. 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 part 10. The air flows in quickly, the air flow loss is small, and the sufficient amount of air flow flows quickly under the drive of the motor 40, and the wind pressure is large. The radial size of the air duct part 10 can be reduced at the same wind speed and air volume, thereby optimizing the wind speed and volume of the garden hair dryer 100, and further reducing the weight of the garden hair dryer 100. On the other hand, the main blowing pipe 11 and the auxiliary blowing pipe 13 cooperate with each other to switch the garden hair dryer 100 between the first working mode of high wind speed and the second working mode of large wind volume, which can meet the performance requirements of wind speed and air volume under different working conditions and improve the performance experience of the garden hair dryer 100. On the other hand, by reasonably configuring the motor 40, axial flow fan 50, air duct section 10, air volume and wind speed in a parameterized manner, a pattern of a high-speed motor 40 and a small axial flow fan 50 is formed, which can meet the performance requirements of the garden hair dryer 100 while achieving compactness and lightness.

[0164] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0165] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A garden hair dryer, characterized in that: The garden blower comprises: Air duct department; a motor, providing driving force for the garden blower; An axial flow fan is arranged in the air duct portion; An operating handle for a user to hold and operate; and A battery pack, used to supply power to the motor; An extension rod extending in a longitudinal direction, wherein the operating handle and the air duct portion are pulled apart from each other in the longitudinal direction by means of the extension rod; The ratio of the longitudinal length of the air duct portion to the longitudinal length of the garden hair dryer is less than or equal to 70%, and the total effective ventilation area of ​​the air inlet shield is less than 12000mm 2 .

2. A garden hair dryer, characterized in that: The garden blower comprises: An air duct portion, including an axial air inlet communicating with the outside; a motor, providing driving force for the garden blower; An axial flow fan is arranged in the air duct portion; An operating handle for a user to hold and operate; and A battery pack, used to supply power to the motor; An extension rod, the extension rod being constructed as a tubular structure extending longitudinally between its proximal end and distal end, the extension rod comprising a handle support section connected to an operating handle at the rear side, and an air duct support section connected to an air duct section at the front side, wherein the ratio of the longitudinal length of the air duct section to the longitudinal length of the garden hair dryer is less than or equal to 70%; The nominal output voltage of the battery pack is less than or equal to 20V, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 9000mm 2 ,or The nominal output voltage of the battery pack is greater than 20V, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 13000mm 2 .

3. A garden hair dryer, characterized in that: The garden blower comprises: Air duct department; a motor, providing driving force for the garden blower; An axial flow fan is arranged in the air duct portion; An operating handle for a user to hold and operate; and A battery pack mounting portion, used for detachably connecting to the battery pack; An extension rod, the extension rod is constructed as a tubular structure extending longitudinally between a proximal end and a distal end thereof, the extension rod comprising a handle support section connected to an operating handle at a rear side and an air duct support section connected to an air duct portion at a front side; The ratio of the length of the air channel portion in the longitudinal direction to the length of the garden hair dryer in the longitudinal direction is less than or equal to 70%, The garden hair dryer also includes an air inlet shield. The motor drives the axial flow fan to rotate around the fan axis and introduce outside air through the air inlet shield. The maximum height H of the air inlet shield is greater than 80 mm and less than 130 mm; the maximum width W of the air inlet shield is greater than 80 mm and less than 130 mm.

4. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The length of the air duct portion is not greater than 600 mm.

5. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The nominal output voltage of the battery pack is less than or equal to 20V, and the diameter of the motor is less than or equal to 40mm; or The nominal output voltage of the battery pack is greater than 20V, and the diameter of the motor is less than or equal to 45mm.

6. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The maximum rotation 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.

7. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The air channel portion includes an axial air inlet; The nominal output voltage of the battery pack is less than or equal to 20V, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 9000mm 2 ,or The nominal output voltage of the battery pack is greater than 20V, and the maximum effective ventilation area of ​​the cross section of the axial air inlet perpendicular to the fan axis is less than 13000mm 2 .

8. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The ratio of the maximum height H of the air inlet shield to the length L of the garden hair dryer is less than 0.15, and the ratio of the maximum width W of the air inlet shield to the length L of the garden hair dryer is less than 0.

15.

9. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The nominal output voltage of the battery pack connected to the garden hair dryer is less than or equal to 20V, and the weight of the garden hair dryer when not connected to the battery pack does not exceed 1.8kg.

10. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The nominal output voltage of the battery pack connected to the garden hair dryer is greater than 20V, and the weight of the garden hair dryer when not connected to the battery pack does not exceed 2kg.

11. The garden hair dryer according to claim 1, 2 or 3, characterized in that: The garden hair dryer comprises a first weight unit connected to the distal end of the extension rod and a second weight unit connected to the proximal end of the extension rod, and in the longitudinal extension direction of the extension rod, the orthographic projection of the center of gravity of the hair dryer combined with the battery pack on a plane perpendicular to the rotating surface of the axial flow fan is G'; The distance between the orthographic projection of the center of gravity M of the first weight unit on the plane perpendicular to the rotation plane of the axial flow fan and the orthographic projection G' is L1, and the distance between the orthographic projection of the center of gravity J of the second weight unit on the plane perpendicular to the rotation plane of the axial flow fan 50 and the orthographic projection G' is L2, and in the longitudinal extension direction of the extension rod, the distance L2 is 40% to 60% of the distance L1 to install the battery pack, or 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 flow fan and the projection G' is L1, the distance between the projection of the center of gravity M of the second weight unit J on the plane perpendicular to the rotating surface of the axial flow fan and the projection G' is L2, and in the longitudinal extension direction of the extension rod, the distance L2 is 60% to 80% of the distance L1 when the battery pack is installed.

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