fan

Abstract

The present invention relates to a blower comprising a housing extending in an axial direction, a battery pack detachably connected to the housing, a power assembly at least partially enclosed in the housing, and an air duct assembly connected to the housing, wherein the housing comprises a connecting section connected to the air duct assembly, a body section connected to an axial rear face of the connecting section, and an installation section connected to the body section for connecting the battery pack, and wherein the power assembly comprises an electric motor located at least partially in the body section and a fan driven to rotate by the electric motor, which rotates to generate an airflow flowing through the interior of the air duct assembly;and wherein the body section comprises an air inlet which is in axial fluid communication with the outside world, and a pre-air intake region located at the axial rearward side of the air inlet, and wherein the air inlet is located on two sides of the installation section in the transverse direction perpendicular to the axial direction. By arranging an air inlet which is open axially to the rearward side and a pre-air intake region located at the axial rearward side of the air inlet, the present invention improves the efficiency of the air intake.

Description

TECHNICAL AREA

[0001] The present invention relates to a blower, in particular a blower that can improve the efficiency of air intake while simultaneously reducing costs. STATE OF THE ART

[0002] A blower is a commonly used garden tool consisting of a housing, an air duct connected to the housing, a channel within the housing, an electric motor installed in the channel, and a fan driven by the electric motor. During operation, the rotating fan creates a negative pressure inside the housing, drawing in outside air through the housing's air inlet and expelling it through the air duct's outlet. This blows leaves or dust to a specific location. To prevent dirt from entering the housing due to the negative pressure created by the blower, a removable air inlet cover with a grille is typically attached. This increases the number of parts and leads to a greater complexity in the assembly process, as well as higher material and installation costs.

[0003] Against this background, there is a real need to provide an improved blower in order to overcome the shortcomings of the state of the art. REVELATION OF THE INVENTION

[0004] With regard to the shortcomings in the prior art, one purpose of the present invention is to provide a blower that can improve the efficiency of air intake while simultaneously reducing costs.

[0005] To solve the existing technical problem, the present invention employs the following technical solution: a blower comprising a housing extending in an axial direction, a battery pack detachably connected to the housing, a power assembly at least partially enclosed in the housing, and an air duct assembly connected to the housing, wherein the housing comprises a connecting section connected to the air duct assembly, a body section connected to an axial rear face of the connecting section, and an installation section connected to the body section for connecting the battery pack, and wherein the power assembly comprises an electric motor located at least partially in the body section and a fan driven to rotate by the electric motor, which rotates to generate an airflow flowing through the interior of the air duct assembly;and wherein the body section comprises an air inlet which is in axial fluid communication with the outside world and a pre-air intake area located at the axial rear of the air inlet, and wherein the air inlet is located substantially on two sides of the installation section in the transverse direction perpendicular to the axial direction.

[0006] A further improvement is that the installation section is connected to an axially rear end of the body section, with the air inlet and pre-air intake area located axially between the installation section and the connecting section.

[0007] A further improvement consists in the fact that the body section is provided with a receiving wall located at the axially rear end and connected to the installation section, with the air inlet opening axially to the rear, and with an axial space between the receiving wall and the air inlet forming the pre-air intake area.

[0008] A further improvement consists of the arrangement of a receiving wall at the axially rear end of the body section, which is connected to the installation section, with an axial distance area between the receiving wall and the air inlet forming the pre-air intake area.

[0009] A further improvement consists in the body section comprising an extension wall connecting the connecting section to the air inlet and an extension wall connecting the air inlet to the receiving wall, wherein the transverse dimensions of the extension wall are larger than the transverse dimensions of the extension wall, and wherein the air inlet is arranged in a projecting area of ​​the extension wall that projects transversely from the extension wall, and wherein the extension wall extends axially forward from the receiving wall and is recessed transversely inwards to form the pre-air intake area.

[0010] A further improvement is that the extension wall and the lengthening wall are both essentially closed in the transverse direction.

[0011] A further improvement consists in the fact that the blower includes some guide elements which are arranged at intervals at the air inlet, the extension direction of the guide elements being oriented in the axial direction essentially parallel to the insertion and removal direction of the battery pack.

[0012] A further improvement is that the guiding element and the body section are formed as a single unit.

[0013] A further improvement is that the ratio of the maximum dimension of the air inlet in the transverse direction to the maximum dimension of the body section in the transverse direction is greater than or equal to 0.1.

[0014] A further improvement consists in the fact that the housing includes a handle section connecting the body section to the installation section, wherein a receiving wall connected to the installation section is arranged at the axially rear end of the body section, and wherein the receiving wall comprises a first side wall facing the handle section and a second side wall facing the battery pack, and wherein, in a vertical direction perpendicular to the axial and transverse directions, the first side wall and the second side wall are each located on two opposite sides of the installation section.

[0015] A further improvement is that the projection of the air inlet in the vertical direction overlaps at least partially with the projection of the handle section in the vertical direction, with the projection of the air inlet in the axial direction overlapping at least partially with the projection of the battery pack in the axial direction.

[0016] In comparison to the prior art, the present invention has the following advantages: the arrangement of an air inlet that is open axially to the rear and a pre-air intake area located at the axial rear of the air inlet improves the efficiency of the air intake. PRESENTATION OF REVELATION Fig. Figure 1 shows a schematic diagram of the structure of a blower in a preferred embodiment of the present invention; Fig. Figure 2 shows a front view of a blower according to Fig. 1 after removing the blowpipe; Fig. Figure 3 shows a bottom view of a blower according to Fig. 2; Fig. Figure 4 shows a right side view of a blower according to Fig. 1; Fig. Figure 5 shows a partially disassembled schematic diagram of a blower according to Fig. 2; Fig. Figure 6 shows a sectional view of a blower according to Fig. 2. Reference symbol list 100 blowers 10 cases 11 Connecting section 12 Body section 121 Air intake 122 Recording wall 123 Extension wall 124 Extension wall 125 Pre-air intake area 126 First widening segment 127 Second widening segment 128 Circular arc-shaped segment 129 First side wall 120 Second side wall 13 Installation section 131 Guide rail 14 Handle section 15 Support section 151 Front part 152 Rear 153 Intermediate part 154 Intermediate groove 155 notch 16 guide element 20 Power module 21 Electric motor 211 Drive shaft 22 fans 221 hub 222 fan blades 23 Electric motor housings 24 traffic cones 30 Air duct assembly 31 blowpipe 311 Air outlet 32 Air intake pipe 321 Outer shell 322 Static guide vane 323 Guide section 40 Ejection structure 41 Swivel rod 42 Elastic element 43 lead SPECIFIC EXECUTION FORMS

[0017] The present invention is explained in more detail below in connection with the accompanying drawings and embodiments.

[0018] The terms used in the present invention serve only to explain certain embodiments, rather than to limit the present invention. For example, the following directional or positional relationships, with terms such as "top," "bottom," "front," "back," etc., are based on the directional or positional relationships illustrated in the drawings. They serve only to clarify the present invention and to facilitate its explanation, and they do not indicate or suggest that the illustrated devices or elements have specific orientations or should be constructed and operated in specific directions. Therefore, they cannot be understood as limiting the present invention.

[0019] With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. Section 6 relates to an embodiment of the present invention comprising a blower 100, comprising a housing 10 extending in an axial direction, a power assembly 20 housed at least partially in the housing 10, an air pipe assembly 30 connected to the axially front end of the housing 10 and a battery pack (not shown) connected to the axially rear end of the housing 10.

[0020] The housing 10 comprises a connecting section 11 connected to the air duct assembly 30, a body section 12 connected to an axial rear face of the connecting section 11, and an installation section 13 connected to the body section 12 for connecting the battery pack, the battery pack being detachably connected to the installation section 13 along the axial direction. The connecting section 11, the body section 12, and the installation section 13 are arranged sequentially along the axial direction. The housing 10 includes a handle section 14, one end of which is connected to the upper part of the body section 12 and the other end to the upper part of the installation section 13. The handle section 14 extends upwards and is spaced a certain distance apart from the body section 12 and the installation section 13 to form a gripping area between them, allowing a user to hold the housing.

[0021] The air duct assembly 30 comprises a blower tube 31, which is detachably connected to the connecting section 11, and an air inlet tube 32, which is at least partially housed in the casing 10, wherein the blower tube 31 and the air inlet tube 32 together form a passage through which the airflow passes. The air inlet tube 32 comprises an outer shell 321, which is attached to the interior of the casing 10, wherein the power assembly 20 is at least partially housed in the outer shell 321. The power assembly 20 comprises an electric motor 21 with a drive shaft 211 and a fan 22, which is driven to rotate by the electric motor 21 and rotates to generate an airflow passing through the passage of the air duct assembly 30.

[0022] The power assembly 20 further comprises an electric motor housing 23, which at least partially accommodates the electric motor 21, and a guide cone 24 connected to the axially front end of the motor housing 23, the electric motor 21 being housed in an interior formed by the electric motor housing 23 and the guide cone 24. The guide cone 24 is designed as a tapered structure that is gradually inclined from rear to front towards the drive shaft 211. The drive shaft 211 extends axially rearward out of the electric motor housing 23, and the fan 22 comprises a hub 221 attached to the drive shaft 211 extending out of the electric motor housing 23 and several fan blades 222 extending from the outer circumference of the hub 221 into the passage.The airflow passage is essentially formed in the form of a ring between the electric motor housing 23 and the outer shell 321 of the air inlet pipe 32, and the blower 100 further comprises static guide vanes 322 which are connected between the outer shell 321 and the electric motor housing 23, the static guide vane 322 being arranged in the direction of the airflow downstream of the fan blade 222.

[0023] With reference to Fig. 1 and Fig. 2 The housing 10 comprises a support section 15 located at the bottom of the body section 12 to support the entire machine, the axial extension of the support section 15 substantially covering the axial length of the entire body section 12. In a vertical direction perpendicular to the axial direction, the handle section 14 and the support section 15 are located on two opposite sides of the body section 12. The installation section 13 extends substantially along the axial direction, such that the battery pack is axially slidably connected to supply power to the power assembly 20.

[0024] Body section 12 includes an air inlet 121 that opens axially to the rear, with the blowpipe 31 including an air outlet 311 located at its axially forward end. The air inlet 121 opens axially to the rear, i.e., it is in axial fluid communication with the outside world. As in connection with Fig. As shown in Figure 6, when the blower 100 is in operation, the drive shaft 211 rotates and drives the fan blades 222 to rotate, thereby creating a negative pressure in the passage, whereby the outside air enters the passage of the air inlet pipe 32 under the influence of the air pressure, is combed by the static guide vane 322 after being accelerated by the rotation of the fan blade 222 to be converted into an airflow substantially parallel to the axial direction, and then enters the blow pipe 31 under guidance by the guide cone 24 and is blown outwards from the air outlet 311. In the axial direction, the blowpipe 31, the air inlet pipe 32 and the installation section 13 are arranged essentially flush, so that the airflow does not substantially change its direction of flow after entering the housing 10 and the airflow passes at least partially through the battery pack before entering the housing 10 in order to cool the battery pack.

[0025] The installation section 13 is connected to the axially rear end of the body section 12, the body section 12 comprising a receiving wall 122 located at the axially rear end, an extension wall 123 connecting the connecting section 11 and the air inlet 121, and an extension wall 124 connecting the air inlet 121 and the receiving wall 122. In a transverse direction perpendicular to the axial direction, the dimensions of the extension wall 123 are larger than the dimensions of the extension wall 124, with the air inlet 121 being arranged in an axially projecting region of the extension wall 123 that projects transversely from the extension wall 124. Simultaneously, the extension wall 124 extends axially forward from the receiving wall 122 and is recessed transversely inwards to form an axially spaced area between the air inlet 121 and the receiving wall 122, which is designed as a pre-air intake area 125. As in conjunction with Fig. 3 and Fig. As shown in Figure 4, the air inlet 121 and the pre-air intake area 125 are located in the axial direction between the installation section 13 and the connecting section 11 and in the transverse direction on both sides of the installation section 13, with the pre-air intake area 125 being located at the axial rear of the air inlet 121. With this arrangement, the outside airflow, before entering the body section 12, first enters the pre-air intake area 125 and is guided through the extension wall 124 to form an axial airflow, and the axial airflow enters the body section 12 without any part of the airflow being lost due to excessive flow direction or turbulence, thereby increasing the efficiency of the air intake.The projection of the air inlet 121 in the vertical direction overlaps at least partially with the projection of the handle section 14 in the vertical direction, wherein the projection of the air inlet 121 in the axial direction overlaps at least partially with the projection of the battery pack in the axial direction.

[0026] As in connection with Fig. As shown in Figure 4, the extension wall 123 is designed to extend outwards in the transverse direction from the two sides of the body section 12, comprising a first widening segment 126 extending outwards in the transverse direction from the upper part of the body section 12, a second widening segment 127 extending outwards in the transverse direction from the bottom of the body section 12, and a circular arc segment 128 connected between the first widening segment 126 and the second widening segment 127. When viewed axially from back to front, the sum of the arc lengths of the extension wall 123 on the two sides of the body section 12 is greater than or equal to 90° at the circumference.It has been extensively tested that if the ratio of the maximum dimension of the air inlet 121 in the transverse direction to the maximum dimension of the body section 12 in the transverse direction (the area of ​​the arc-shaped segment 128 of the extension wall 123) is greater than or equal to 0.1, the efficiency of the air intake can meet the requirements of most working scenarios on the market.

[0027] The blower 100 further comprises several guide elements 16, which are arranged at intervals at the air inlet 121. The guide elements 16 are spaced to prevent external contaminants from entering the housing 10 and thus damaging the power assembly 20. The direction of extension of the guide elements 16 is aligned parallel to the axial direction, so that the airflow passing through the pre-air intake area 125, guided by the guide elements 16, more closely resembles the axial airflow. This prevents the airflow from impacting the inside of the extension wall 123 after entering the housing and causing increased noise. The guide elements 16 are formed integrally with the body section 12, thus eliminating the need to install an additional air guide cover, which would increase molding, material, and assembly costs.The axial direction of the guide elements 16 is essentially parallel to the insertion and removal direction of the battery pack, whereby the airflow entering the housing 10 flows at least partially through the outer surface of the battery pack and then enters the pre-air intake area 125, and, guided by the extension wall 124, enters the extension wall 123 through the gap of the guide elements 16. When a substantially parallel alignment is mentioned here, this does not explicitly mean a perfectly parallel alignment; a slight deviation or an inclination by a certain angle between the two is also possible.

[0028] The receiving wall 122 comprises a first side wall 129 facing the handle section 14 and a second side wall 120 facing the battery pack, wherein, in the vertical direction, the first side wall 129 and the second side wall 120 are each located on two opposite sides of the installation section 13. The second side wall 120 extends along the vertical direction on the lower side of the installation section 13 and is arranged substantially perpendicular to the installation section 13. From the upper part of the installation section 13, the first side wall 129 extends inclined forward and upward toward the front end of the handle section 14. The air inlet 121 is located, in the axial direction, substantially at the intersection between the first side wall 129 and the front end of the handle section 14; wherein, in the transverse direction, the air inlet 121 is located on the front two sides of the first side wall 129.An obtuse angle is formed between the first side wall 129 and the top of the installation section 13 in order to increase the reach area.

[0029] With reference to Fig. 5 and Fig. 6 The installation section 13 extends axially rearward from the upper end of the second side wall 120 to form a guide rail 131 on its lower surface for guiding the assembly or disassembly of the battery pack. An ejection structure 40 for the battery pack is arranged on the second side wall 120. With reference to Fig. The ejection structure 40 comprises a rotary rod 41, which is rotatably attached to the second side wall 120, and an elastic element 42, which is retractably attached to the second side wall 120. A projection 43 is arranged at a trailing end of the rotary rod 41, projecting from the second side wall 120, and the elastic element 42 presses against the rotary rod 41, so that the projection 43 always tends to protrude from the second side wall 120, and when the battery pack is unlocked, the projection 43 presses against the battery pack to eject the installation section 13 in an axial direction.

[0030] As in connection with Fig. As shown in Figure 2, the rear end of the air inlet pipe 32 rests against the inside of the extension wall 123. The rear end of the air inlet pipe 32 is provided with a guide section 323, which is designed as a conical ring. This means that in the axial direction, the diameter of the guide section 323 decreases progressively from rear to front, allowing the airflow from the body section 12 to be efficiently directed into the air inlet pipe 32 before flowing through the power assembly 20. The air inlet 121 is located axially between the guide section 323 and the second side wall 120. This ensures that the airflow has a longer distance after entering the body section 12, thus more closely resembling the axial airflow. This prevents the formation of excessive turbulence that would impinge on the inside of the body section 12 and increase noise, while simultaneously improving air intake efficiency.

[0031] As in connection with Fig. 3 and Fig.As shown in Figure 4, the support section 15 comprises a front part connected to the axially forward end of the body section 12, a rear part 152 connected to the lower end of the second side wall 120, and an intermediate part 153 connecting the front part 151 to the rear part 152. The intermediate part 153 is provided with an intermediate groove 154, and a position of the extension wall 123 of the body section 12 corresponding to the intermediate groove 154 is provided with several air inlet holes spaced at intervals. The rear part 152 is provided with a notch 155, and a position of the body section 12 corresponding to the notch 155 is also provided with several air inlet holes spaced at intervals. By providing the bottom and rear part 152 of the body section 12 with several spaced air inlet holes, the air intake area is increased to improve the efficiency of air blowing.

[0032] In the present embodiment, the extension wall 123 and the extension wall 124 are essentially formed as a closed structure in the transverse direction, wherein the receiving wall 122 is also essentially formed as a closed structure in the axial direction, and wherein the “essentially formed as a closed structure” mentioned here refers to the fact that there is no fluid connection with the outside world, or that a small number of openings are provided therein through which a small airflow is achieved inside and outside the housing 10.

[0033] In the embodiment described above, the battery pack is installed along the axial direction on the rear of the second side wall 120 of the receiving wall 122. In other embodiments, the installation section 13 can also be arranged to extend from the first side wall 129 of the receiving wall 122 to the outside or inside of the housing 10, so that the battery pack overlaps at least partially with the body section 12 in the vertical direction. The remaining structure remains unchanged; that is, the air inlets 121 are still provided on two sides in the transverse direction of the installation section 13. This arrangement allows the axial dimensions of the entire machine to be further reduced, while ensuring air intake efficiency and cost savings.The insertion and removal direction of the battery pack can run along the vertical direction or along an inclined direction that intersects the axial direction.

[0034] The present invention is not limited to the specific embodiment described above. A person skilled in the art in this field can easily understand that there are many alternatives to the blower of the present invention without deviating from the principles and scope of the present invention. The scope of protection of the present invention is determined by the content of the claims.

Claims

[1] Blower comprising a housing extending in an axial direction, a battery pack detachably connected to the housing, a power assembly at least partially enclosed in the housing and an air duct assembly connected to the housing, wherein the housing comprises a connecting section connected to the air duct assembly, a body section connected to an axial rear side of the connecting section and an installation section connected to the body section for connecting the battery pack, and wherein the power assembly comprises an electric motor located at least partially in the body section and a fan driven to rotate by the electric motor, which rotates to generate an airflow passing through the interior of the air duct assembly, characterized by, that the body section comprises an air inlet which is in axial fluid communication with the outside world and a pre-air intake area located at the axial rear of the air inlet, wherein the air inlet is located substantially on two sides of the installation section in the transverse direction perpendicular to the axial direction. [2] Blower according to claim 1, characterized by , that the installation section is connected to an axially rear end of the body section, with the air inlet and pre-air intake area being located axially between the installation section and the connecting section. [3] Blower according to claim 2, characterized by, that the body section is provided with a receiving wall located at the axially rear end and connected to the installation section, wherein the air inlet is open axially to the rear, and wherein an axial space between the receiving wall and the air inlet forms the pre-air intake area. [4] Blower according to claim 3, characterized by , that the body section comprises an extension wall connecting the connecting section to the air inlet, and an extension wall connecting the air inlet to the receiving wall, wherein the transverse dimensions of the extension wall are larger than the transverse dimensions of the extension wall, and wherein the air inlet is arranged in a projecting area of ​​the extension wall that projects transversely from the extension wall, and wherein the extension wall extends axially forward from the receiving wall and is recessed transversely inwards to form the pre-air intake area. [5] Blower according to claim 4, characterized by that the extension wall and the lengthening wall are both essentially closed in the transverse direction. [6] Blower according to claim 1, characterized by , that the blower comprises some guide elements which are arranged at intervals at the air inlet, wherein the extension direction of the guide elements in the axial direction is oriented essentially parallel to the insertion and removal direction of the battery pack. [7] Blower according to claim 6, characterized by that the guiding element and the body section are formed as a single unit. [8] Blower according to claim 1, characterized by , that the ratio of the maximum dimension of the air inlet in the transverse direction to the maximum dimension of the body section in the transverse direction is greater than or equal to 0.

1. [9] Blower according to claim 1, characterized by, that the housing comprises a handle section connecting the body section to the installation section, wherein a receiving wall connected to the installation section is arranged at the axially rear end of the body section, and wherein the receiving wall comprises a first side wall facing the handle section and a second side wall facing the battery pack, and wherein, in a vertical direction perpendicular to the axial and transverse directions, the first side wall and the second side wall are each located on two opposite sides of the installation section. [10] Blower according to claim 9, characterized by , that the projection of the air inlet in the vertical direction overlaps at least partially with the projection of the handle section in the vertical direction, wherein the projection of the air inlet in the axial direction overlaps at least partially with the projection of the battery pack in the axial direction.

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