Backpack type air blower

Abstract

The utility model relates to a backpack type air blower which comprises a backpack frame. The air blowing assembly is arranged in the bearing frame, and the air blowing assembly comprises a driving motor and a fan; the battery pack is suitable for providing power for the driving motor so as to drive the motor to drive the fan to rotate to generate airflow passing through the main air channel of the air blowing assembly; the battery pack is provided with a heat dissipation air duct comprising an air inlet and an air outlet communicated with an inner cavity of the battery pack; the first air cooling channel is formed on the inner side of the bearing frame, one end of the first air cooling channel is communicated with an air outlet of the heat dissipation air channel of the battery pack, and the other end of the first air cooling channel is communicated with a main air channel of the air blowing assembly through a first negative pressure inlet. According to the technical scheme, negative pressure is formed by high-speed airflow of the main air duct, airflow in the inner cavity of the battery pack is automatically guided into the main air duct, an additional power device is not needed, and the working efficiency of the heat dissipation system is improved.

Description

Technical Field

[0001] This utility model relates to a blower, and more particularly to a backpack blower. Background Technology

[0002] Power tools are more environmentally friendly than engine-driven tools, leading to their widespread use. To facilitate portability, backpack blowers are now commonly used, allowing users to carry the equipment on their backs, thus reducing strain on their hands and alleviating fatigue.

[0003] However, backpack blowers generally have high power and high current, which causes the battery pack to reach high temperatures during discharge. Therefore, the battery pack needs to be cooled, and the controller connecting the battery pack and the working motor also needs to be cooled. Utility Model Content

[0004] The purpose of this invention is to provide a backpack blower that can effectively dissipate heat from battery packs.

[0005] In view of this, the present application provides a backpack blower, comprising:

[0006] Back support frame;

[0007] A blower assembly, disposed within the backpack frame, the blower assembly including a drive motor and a fan;

[0008] The battery pack is adapted to provide power to the drive motor to drive the motor to rotate the fan and generate airflow through the main air duct of the blower assembly; the battery pack has a heat dissipation air duct, including an air inlet and an air outlet communicating with the inner cavity of the battery pack.

[0009] It also includes:

[0010] The first air cooling channel is formed on the inner side of the back frame, with one end connected to the air outlet of the heat dissipation duct of the battery pack, and the other end connected to the main air duct of the blower assembly via the first negative pressure inlet.

[0011] Furthermore, an integrally formed recessed groove is provided on the inner wall of the back frame, and the recessed groove is configured as part of the first air cooling channel.

[0012] Furthermore, the first air cooling channel is formed on the inner periphery of the back frame, extending from the battery mounting portion to the blower assembly mounting portion;

[0013] The battery mounting portion is adapted to install and connect the battery pack, and the blower assembly mounting portion is adapted to install and connect the blower assembly.

[0014] Furthermore, the inner wall of the back frame extends outward to form a hollow groove to at least partially form the first air cooling channel, the hollow groove extending from the battery mounting portion to the blower assembly mounting portion.

[0015] Furthermore, the battery mounting part includes a battery mounting seat with a hollow cavity, the battery mounting seat being fixedly connected to the inner side of the back frame, so that the hollow cavity and the hollow groove cooperate to form the first cooling section of the first air cooling channel;

[0016] The blower assembly mounting section is provided with a pressure cover, which matches the shape of the hollow groove to form the second cooling section of the first air cooling channel.

[0017] Furthermore, one end of the pressure cap extends toward the battery mounting base to abut against it.

[0018] Furthermore, the pressure cap is at least partially arc-shaped to form part of the arc-shaped wall surface of the blower assembly mounting portion.

[0019] Furthermore, it also includes:

[0020] A first circuit board, adapted to connect the battery pack and the drive motor, and a first mounting portion for connecting and mounting the first circuit board is correspondingly provided on the inner side of the backpack frame; and,

[0021] The second air cooling channel is formed on the inner side of the back frame. One end is connected to the airflow of the first mounting part of the first circuit board, and the other end is connected to the main air duct of the blower assembly through the second negative pressure inlet.

[0022] Furthermore, the first circuit board is connected to the first mounting portion by a mounting connector, the mounting connector containing a channel that is configured as part of the second air cooling channel.

[0023] Furthermore, the first negative pressure inlet and / or the second negative pressure inlet are located upstream of the air inlet of the fan, and are connected to the upstream side of the main air duct.

[0024] Furthermore, it also includes:

[0025] An air inlet duct is disposed on the inner wall of the air inlet section of the back frame;

[0026] The air inlet duct has holes that are respectively connected to the first air cooling channel and the second air cooling channel to form the first negative pressure inlet and the second negative pressure inlet.

[0027] Furthermore, the second air cooling channel and the first mounting portion of the first circuit board are formed on the inner bottom side of the back frame, located below the blower assembly mounting portion.

[0028] Furthermore, an air inlet is provided on the side of the first mounting part opposite to the second negative pressure inlet, and the air inlet passes through the back frame and connects to the outside.

[0029] Furthermore, the inner bottom side of the back frame is provided with an inwardly extending protrusion near the first mounting portion to approach the first circuit board, and the extension portion is provided with a through opening communicating with the outside to form the air inlet.

[0030] Furthermore, it also includes:

[0031] The first heat sink is connected to the first circuit board;

[0032] The component housing is positioned and connected to the first circuit board and the first heat sink. The heat sink fins of the first heat sink are spaced apart from the inner wall of the component housing to form an airflow channel, which constitutes part of the second air cooling channel.

[0033] Furthermore, the carrying frame includes a support member near the side of the person carrying the load, and the inner bottom side of the support member is provided with a first half-channel.

[0034] The component housing has a second half-channel at one end near the second negative pressure inlet;

[0035] When the component housing is positioned and installed on the first mounting part, the first half-channel and the second half-channel are adapted and matched to form a guide channel that is connected to the airflow channel. The guide channel is connected to the second negative pressure inlet and constitutes part of the second air cooling channel.

[0036] Furthermore, it also includes:

[0037] A second circuit board is adapted to connect the battery pack and the drive motor, and a second mounting part for connecting and mounting the second circuit board is correspondingly provided on the inner side of the backpack frame.

[0038] The second mounting part is located upstream of the air inlet of the fan. The second circuit board and a second heat sink are combined and embedded in the second mounting part. At least part of the heat dissipation outer surface of the second heat sink is exposed in the main air duct.

[0039] Furthermore, it also includes:

[0040] An air inlet duct is disposed on the inner wall of the air inlet section of the back frame;

[0041] The air inlet duct has an opening corresponding to the second heat sink, so that at least part of the heat dissipation outer surface of the second heat sink is exposed in the main air duct.

[0042] Furthermore, the first air cooling channel communicates with the second mounting portion, such that the cable connecting the battery pack and the second circuit board is at least partially confined within the first air cooling channel.

[0043] Furthermore, the second mounting portion is connected to the first mounting portion suitable for mounting the first circuit board via a wiring channel, such that the cable connecting the first circuit board and the second circuit board is at least partially confined within the wiring channel.

[0044] Furthermore, a narrowing portion is provided between the first air cooling channel and the wiring channel. The narrowing portion is configured to reduce the connection diameter between the first air cooling channel and the wiring channel and to clamp the cable.

[0045] Furthermore, the cable clamped in the constricted portion forms a barrier with the constricted portion to block the communication between the main airflow flowing in the first air cooling channel and the main airflow flowing in the second air cooling channel.

[0046] Compared with the prior art, the beneficial technical effects of this application are as follows:

[0047] This application provides a first air cooling channel connected to the battery pack cavity and the main air duct of the blower assembly on the inner wall of the back frame. Utilizing the negative pressure inlet formed at one end of the channel by the high-speed airflow in the main air duct during blower assembly operation, the airflow inside the battery pack cavity is guided into the main air duct, effectively removing the heat generated by the battery pack. This achieves efficient cooling of the battery pack, extending its lifespan and performance stability. Furthermore, a second air cooling channel connected to the circuit board mounting section and the main air duct of the blower assembly is provided. This second air cooling channel, through a negative pressure inlet, promptly removes the heat generated by the circuit board during operation, reducing the risk of damage due to overheating and ensuring stable circuit operation. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0049] Figure 1: A schematic diagram of the structure of a specific embodiment of this utility model;

[0050] Figure 2 : Schematic diagram of the first negative pressure inlet and the second negative pressure inlet of a specific embodiment of this utility model;

[0051] Figure 3 : Exploded view of a specific embodiment of this utility model;

[0052] Figure 4 : A schematic diagram of the first air cooling channel structure in a specific embodiment of this utility model;

[0053] Figure 5a : A schematic diagram of the cable C arrangement in a specific embodiment of this utility model;

[0054] Figure 5b : A structural cross-sectional view of a specific embodiment of this utility model;

[0055] Figure 6 Figure 5 shows an enlarged schematic diagram of a portion of structure A in a specific embodiment of this utility model.

[0056] Figure 7 : A schematic diagram of the first mounting part in a specific embodiment of this utility model;

[0057] Figure 8 : A longitudinal structural sectional view of a specific embodiment of this utility model;

[0058] Figure 9 : A schematic diagram of the battery mounting bracket assembly structure of a specific embodiment of this utility model;

[0059] Figure 10 A schematic diagram of the back-side structure of the back-side frame in a specific embodiment of this utility model;

[0060] Figure 11 : A schematic diagram of the battery mounting base structure of a specific embodiment of this utility model;

[0061] Figure 12 : A schematic diagram of the structure of the second circuit board and the second heat sink in a specific embodiment of this utility model;

[0062] Figure 13 : A schematic diagram of the recessed groove structure of a specific embodiment of this utility model;

[0063] Figure 14 : Schematic diagram of cable C arrangement in specific embodiment 1 of this utility model;

[0064] Figure 15 : Schematic diagram of cable C arrangement in specific embodiment 2 of this utility model;

[0065] Figure 16 : Schematic diagram of cable C arrangement in specific embodiment 3 of this utility model. Detailed Implementation

[0066] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0067] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a backpack blower 100 includes a backpack frame 1, a blower assembly 2, a battery pack 3, and an air cooling channel 4, as well as a circuit board and a cable C for transmitting power (see reference). Figure 5a (As shown).

[0068] The air cooling channel 4 includes a first air cooling channel 4a and a second air cooling channel 4b, and the circuit board includes a first circuit board 6a and / or a second circuit board 6b.

[0069] In one embodiment, the backpack blower 100 includes a first circuit board 6a for connecting the battery pack 3 and the drive motor 20. A first mounting portion 27 for connecting and mounting the first circuit board 6a is correspondingly provided on the inner side of the backpack frame 1. Figure 7 As shown), at this time, refer to Figure 14 As shown, the battery pack 3 is connected to the first circuit board 6a via a cable C, and the first circuit board 6a is connected to the drive motor 20 via another cable (not shown in the figure), thus enabling the battery pack 3 to transmit power to the drive motor 20.

[0070] In another embodiment, the backpack blower 100 includes a second circuit board 6b for connecting the battery pack 3 and the drive motor 20. A second mounting portion 28 for connecting and mounting the second circuit board 6b is correspondingly provided on the inner side of the backpack frame 1. Figure 3 As shown), at this time, refer to Figure 15 As shown, the battery pack 3 is connected to the second circuit board 6b via a cable C, and the second circuit board 6b is connected to the drive motor 20 via another cable (not shown in the figure), thus enabling the battery pack 3 to transmit power to the drive motor 20.

[0071] In yet another embodiment, reference is made to... Figure 16As shown, the backpack blower 100 includes a first circuit board 6a and a second circuit board 6b. The battery pack 3 is connected to the second circuit board 6b via a cable C. The second circuit board 6b is connected to the first circuit board 6a via another cable C. The first circuit board 6a is connected to the drive motor 20 via yet another cable (not shown in the figure), thus enabling the battery pack 3 to transmit power to the drive motor 20.

[0072] Continue to refer to Figure 2 , Figure 3 and Figure 4 ,as well as Figure 5b and Figure 14 As shown, in one embodiment 1, the backpack blower 100 has a first circuit board 6a.

[0073] The blower assembly 2 is disposed within the backpack frame 1. The blower assembly 2 includes a drive motor 20 and a fan 21. The battery pack 3 is adapted to provide power to the drive motor 20 via the first circuit board 6a to drive the drive motor 20 to rotate the fan 21 and generate airflow through the main air duct 22 of the blower assembly 2. The battery pack 3 has a heat dissipation air duct, including an air inlet 30 and an air outlet 31 that connect the inner cavity of the battery pack 3.

[0074] The first air cooling channel 4a is formed on the inner side of the back frame 1, especially on the inner circumferential side. One end is connected to the inner cavity of the heat dissipation air duct of the battery pack 3 through the air outlet 31, and the other end extends to be connected to the main air duct 22 of the blower assembly 2. Specifically, it is connected to the main air duct 22 of the blower assembly 2 through the first negative pressure inlet 7.

[0075] The second air cooling channel 4b is formed on the inner side of the back frame 1, especially on the inner bottom side. One end is connected to the first mounting part 27 of the first circuit board 6a for airflow, and the other end is connected to the main air duct 22 of the blower assembly 2 via the second negative pressure inlet 8.

[0076] In addition, the cable C is adapted to connect the battery pack 3 to the drive motor 20 via the first circuit board 6a, so as to transmit the power provided by the battery pack 3 to the drive motor 20. The cable C is at least partially confined in the first air cooling channel 4a, and does not completely block the first air cooling channel 4a, thus ensuring the airflow in the cooling channel and ensuring the heat dissipation effect of the battery pack 3.

[0077] The first air cooling channel 4a and the second air cooling channel 4b are connected by a wiring channel 29, so that the cable C for transmitting power to the battery pack 3 passes through the first air cooling channel 4a and extends through the wiring channel 29 toward the second air cooling channel 4b, so that the other end of the cable C is connected to the first circuit board 6a.

[0078] By setting up a wiring channel 29 between the first air cooling channel 4a and the second air cooling channel 4b, the space in the back frame 1 structure is made reasonable use of, avoiding the need to create new space for cable C wiring, and making the overall layout of the blower more compact. At the same time, it makes the cable C wiring more orderly, avoiding a messy wiring method.

[0079] A narrowing portion 50 is provided between the first air cooling channel 4a and the wiring channel 29. The narrowing portion 50 is configured to reduce the diameter of the connection between the first air cooling channel 4a and the wiring channel 29, and to clamp the cable C.

[0080] The constriction 50 guides the airflow to a certain extent, allowing the cooling air to flow more concentratedly over the parts of the battery pack 3 and the first circuit board 6a that require heat dissipation. The cooling airflow between the two components does not cross-contaminate, thus improving cooling efficiency. Furthermore, the constriction 50 can securely clamp the cable C, preventing it from shifting or coming loose, further enhancing the cable's stability and reliability.

[0081] The cable C, clamped within the constricted portion 50, forms a barrier to block the main airflow in the first air cooling channel 4a from flowing through the main airflow in the second air cooling channel 4b. This ensures that the airflow in the two cooling channels flows independently, preventing mutual interference and resulting in a more stable cooling effect for each channel. The airflow in each channel can then more effectively cool specific components. For example, the first air cooling channel 4a can focus on efficiently cooling the battery pack 3, while the second air cooling channel 4b can better cool the first circuit board 6a component, improving both cooling efficiency and targeting. When the blower assembly 2 is rotating after receiving power, a high-speed airflow is formed in the main air duct 22. The end of the first air cooling channel 4a connected to the main air duct 22 forms a negative pressure inlet, namely the first negative pressure inlet 7, which guides the airflow of the inner cavity of the battery pack 3 into the main air duct 22 through the first air cooling channel 4a. The end of the second air cooling channel 4b connected to the main air duct 22 forms a negative pressure inlet, namely the second negative pressure inlet 8, which guides the airflow of the first mounting part 27 of the first circuit board 6a into the main air duct 22 through the second air cooling channel 4b.

[0082] When the blower assembly 2 is rotating after receiving power, a high-speed airflow is formed in the main air duct 22. The end of the first air cooling channel 4a connected to the main air duct 22 forms a negative pressure inlet, namely the first negative pressure inlet 7, which guides the airflow of the inner cavity of the battery pack 3 into the main air duct 22 through the first air cooling channel 4a. The end of the second air cooling channel 4b connected to the main air duct 22 forms a negative pressure inlet, namely the second negative pressure inlet 8, which guides the airflow of the first mounting part 27 of the first circuit board 6a into the main air duct 22 through the second air cooling channel 4b.

[0083] This application provides a first air cooling channel 4a connecting the inner cavity of the battery pack 3 to the main air duct 22 of the blower assembly 2, and a second air cooling channel 4b connecting the first mounting part 27 of the first circuit board 6a to the main air duct 22 of the blower assembly 2. When the blower assembly 2 is working, the high-speed airflow in the main air duct 22 forms a first negative pressure inlet 7 and a second negative pressure inlet 8 at one end of the channel. The first negative pressure inlet 7 guides the airflow from the inner cavity of the battery pack 3 into the main air duct 22, effectively removing the heat generated by the battery pack 3, achieving efficient cooling of the battery pack 3, extending its service life and performance stability. Simultaneously, the second negative pressure inlet 8 guides the airflow from the first mounting part 27 of the first circuit board 6a into the main air duct 22, promptly removing the heat generated by the first circuit board 6a during operation, reducing the risk of damage to the first circuit board 6a due to overheating, and ensuring stable circuit operation.

[0084] In addition, the design of the first negative pressure inlet 7 and the second negative pressure inlet 8 utilizes the high-speed airflow of the main air duct 22 to form negative pressure, automatically guiding the airflow of the battery pack 3 cavity and the first circuit board 6a mounting part 27 into the main air duct 22. No additional power device is required, which improves the working efficiency of the heat dissipation system. At the same time, in terms of structural design, the blower assembly 2 is set inside the backpack frame 1, the first air cooling channel 4a is formed on the inner circumferential side of the backpack frame 1, and the second air cooling channel 4b is formed on the inner bottom side of the backpack frame 1, making full use of the internal space of the backpack frame 1 and making the overall structure more compact.

[0085] In addition, continue to refer to Figure 5a As shown, by at least partially confining cable C within the first air cooling channel 4a, a reasonable cable layout is achieved without completely blocking the channel, making full use of the limited space. This solves the technical problem of messy wiring in traditional backpack blowers 100, ensuring that airflow through the air cooling channel is not affected while still allowing for efficient cable layout and a cleaner overall structure. Furthermore, while the cable transmits power, it is also affected by the cooling airflow to some extent, reducing its operating temperature and improving its stability and lifespan.

[0086] Among them, reference Figure 13 As shown, recessed grooves S1, S2, and S3 are integrally formed on the inner wall of the back frame 1. The recessed grooves S1, S2, and S3, as will be mentioned below, are configured as part of the first air cooling channel 4a, and the recessed groove S3 is configured as at least part of the wiring channel 29.

[0087] Furthermore, the first circuit board 6a is mounted to the first mounting portion 27 by a mounting connector, the mounting connector containing a channel that is configured as part of the second air cooling channel 4b. This mounting connector is the component housing 26, which will be mentioned below.

[0088] The first air cooling channel 4a and the second air cooling channel 4b will be further described below.

[0089] Continue to refer to Figure 3 As shown, the blower assembly 2 includes a drive motor 20 and a fan 21. The drive motor 20 and the fan 21 are connected as one unit and fixedly installed in the duct 23 to form a duct assembly. An air inlet duct 24 and an air inlet cover 25 are arranged sequentially on the air inlet side of the fan 21. They are assembled and connected with the duct assembly to form the blower assembly 2.

[0090] It should be noted that the first air cooling channel 4a and the second air cooling channel 4b are connected to the main air duct 22 of the blower assembly 2, especially to the upstream side of the main air duct 22, that is, the air intake side of the fan 21. Of course, they can also be connected to the downstream side of the main air duct 22, that is, the air outlet side of the fan 21.

[0091] In other words, in the above embodiment 1, the first negative pressure inlet 7 and the second negative pressure inlet 8 are preferably located upstream of the air inlet of the fan 21 and connected to the upstream side of the main air duct 22.

[0092] In this specific embodiment, the air cooling channel 4 is connected to the upstream side of the main air duct 22. Specifically, holes 220 and 221 are provided on the air inlet duct 24 (see reference). Figure 5b As shown), the hole 220 is connected to one end of the first air cooling channel 4a to form a first negative pressure inlet 7, so that the first air cooling channel 4a is connected to the main air duct 22 of the blower assembly 2 through the hole 220.

[0093] The hole 221 is connected to one end of the second air cooling channel 4b to form a second negative pressure inlet 8, so that the second air cooling channel 4b is connected to the main air duct 22 of the blower assembly 2 through the hole 221.

[0094] When the blower assembly 2 is working, the high-speed airflow in the main air duct 22 forms a negative pressure inlet at the through hole 220, which guides the airflow inside the battery pack 3 into the main air duct 22, effectively removing the heat generated by the battery pack 3 and the first circuit board 6a.

[0095] Further reference Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the first air cooling channel 4a extends from the battery mounting part 10 to the blower assembly mounting part 11;

[0096] Battery mounting section 10 is suitable for mounting and connecting battery pack 3;

[0097] The blower assembly mounting section 11 is suitable for mounting and connecting the blower assembly 2.

[0098] The first air cooling channel 4a extends from the battery mounting section 10 to the blower assembly mounting section 11, effectively removing the heat generated by the battery pack 3 during operation. It makes full use of the internal space of the back frame 1, making the overall structure of the device more compact. Effective cooling is achieved without increasing the volume.

[0099] Specifically, refer to Figure 9 and combined Figure 8 As shown, the inner wall of the back frame 1 extends outward to form a hollow groove 12 to at least partially form a first air cooling channel 4a. The hollow groove 12 extends from the battery mounting portion 10 to the blower assembly mounting portion 11.

[0100] The hollow groove 12 provides a direct and continuous channel for cooling airflow, ensuring that the heat generated by the battery pack 3 can be quickly transferred and eventually dissipated.

[0101] The second air cooling channel 4b and the first mounting portion of the first circuit board 6a are formed on the inner bottom side of the back frame 1, below the blower assembly mounting portion 11, without occupying additional space, thus improving space utilization. This layout allows for smoother airflow. Hot air generated by the battery pack can naturally flow towards the blower assembly, while hot air from the first circuit board can also be quickly drawn into the main air duct of the blower assembly through the lower second air cooling channel. The optimized airflow path improves the overall performance of the heat dissipation system.

[0102] Continue to refer to Figure 10 As shown, the wall of the hollow groove 12 forms a central support portion 13 on the back side of the carrying frame 1. The central support portion 13 and the edge support portion 14 of the carrying frame 1 form a spaced multi-segment support on the back side of the blower assembly mounting portion 11. The spaced multi-segment support formed by the central support portion 13 and the edge support portion 14 can provide a more uniform and stable support force for the blower assembly mounting portion 11. In addition, while ensuring the support effect, unnecessary material usage is reduced, thereby reducing the overall weight of the carrying frame 1.

[0103] Continue to refer to Figure 9 , Figure 10 and Figure 11 As shown, and in combination Figure 8As shown, the battery mounting part 10 includes a battery mounting base 101 with a hollow cavity 1011. The battery mounting base 101 is fixedly connected to the inner side of the back frame 1 so that the hollow cavity 1011 and the hollow groove 12 cooperate to form a first cooling section 40a of the first air cooling channel 4a.

[0104] The blower assembly mounting section 11 is provided with a pressure cover 110, which matches the shape of the hollow groove 12 to form the second cooling section 41a of the first air cooling channel 4a.

[0105] Specifically, the battery mounting base 101 includes a protruding plug-in portion 1013 and an electrical connection terminal 1014. The plug-in portion 1013 is provided with a guide port 1012, which is connected to the hollow cavity 1011. The plug-in portion 1013 is connected to the battery pack 3, and the air outlet 31 of the battery pack 3 corresponds to the guide port 1012. One exposed end of the electrical connection terminal 1014 is plugged into the plug-in terminal of the battery pack 3, and the other end, which is hidden in the hollow cavity 1011, is connected to the first circuit board 6a through a cable C.

[0106] Furthermore, one end of the cover 110 extends toward the battery mounting base 101 to abut against it. The contact between the cover 110 and the battery mounting base 101 effectively prevents air leakage from the connection between the two, ensuring sufficient cooling airflow and maintaining good cooling efficiency, so that the battery pack and blower assembly can continue to operate at a suitable temperature.

[0107] Continue to refer to Figure 3 As shown, the pressure cap 110 is at least partially arc-shaped to form part of the arc-shaped wall of the blower assembly mounting section 11, so as not to affect the installation of the blower assembly 2 by the blower assembly mounting section 11.

[0108] As described above, the battery mounting base 101 has a guide port 1012 on the side of the battery pack 3 where the air outlet 31 is located. The guide port 1012 is connected to the hollow cavity 1011. Furthermore, the other side of the battery pack 3 is also provided with an air inlet 30, which is connected to the air outlet 31 through the inner cavity of the battery pack 3. The back frame 1 has an air inlet 15 at the position opposite to the air inlet 30, and the two are connected to each other.

[0109] The battery pack 3 has an air inlet 30 on one side and an air outlet 31 on the other side. Combined with the air guide 1012 on the battery mounting base 101, a complete and smooth airflow circulation path is formed. At the same time, the air inlet 15 on the back frame 1, which is positioned relative to the air inlet 30, ensures that sufficient cold air enters.

[0110] In this way, cold air flows into the inner cavity of the battery pack 3 from the air inlet 15 into the air inlet 30, and flows out from the air outlet 31, enters the hollow cavity 1011 through the guide port 1012, flows into the first air cooling channel 4a, and finally enters the main air duct 22.

[0111] Therefore, the cold air flows along this specific path, enabling it to fully and directly contact all parts of the battery pack and quickly remove the heat generated during battery operation.

[0112] Reference Figure 4 Figure 5 Figure 6 and Figure 7 As shown, regarding the second air cooling channel 4b, an air inlet 5 is provided on the side of the first mounting part 27 used to mount the first circuit board 6a opposite to the second negative pressure inlet 8. The air inlet 5 passes through the back frame 1 and is connected to the outside, so that the outside cold air can directly enter the second air cooling channel 4b, which can increase the air flow and improve the heat dissipation effect on the first circuit board 6a.

[0113] Cold air enters through air inlet 5, flows through the first circuit board 6a, and is then drawn into the main air duct 22 by the second negative pressure inlet 8, forming a good heat dissipation cycle.

[0114] Specifically, the inner bottom side of the carrying frame 1, near the first mounting portion 27, has an inwardly extending portion 16 that protrudes close to the first circuit board 6a. The extension portion 16 has a through opening 17 that communicates with the outside (see reference). Figure 7 (As shown) to form air inlet 5.

[0115] The extension 16 is close to the first circuit board 6a, allowing cold air to come into more direct contact with the heat source.

[0116] In addition, further reference Figure 5b , Figure 6 and Figure 7 As shown, the first heat sink 9a is connected to the first circuit board 6a;

[0117] The component housing 26 is positioned and mounted to connect the first circuit board 6a and the first heat sink 9a, thereby positioning and mounting the integrally connected first circuit board 6a and first heat sink 9a to the first mounting portion 27. The heat dissipation fin end faces of the first heat sink 9a are spaced apart from the inner wall of the component housing 26 to form an airflow channel 40b, which constitutes part of the second air cooling channel 4b. The airflow channel 40b in the component housing 26 contains a channel within the mounting connector described above, and this channel is constructed as part of the second air cooling channel 4b.

[0118] The carrying frame 1 includes a support member 10a near the side of the person carrying the load, and the inner bottom side of the support member 10a is provided with a first half-channel 410.

[0119] The component housing 26 has a second half-channel 411 at one end near the second negative pressure inlet 8;

[0120] When the component housing 26 is positioned and connected to the first mounting part 27, the first half-channel 410 and the second half-channel 411 are adapted and matched to form a guide channel 41b that is connected to the airflow channel 40b. The guide channel 41b is connected to the second negative pressure inlet 8 and constitutes part of the second air cooling channel 4b.

[0121] The arrangement of airflow channel 40b and guide channel 41b makes airflow smoother, reduces airflow resistance, and improves heat dissipation.

[0122] In another embodiment 2, the backpack blower has a second circuit board 6b.

[0123] This embodiment 2 is basically similar in principle to the above embodiment 1, except that the second circuit board 6b in this embodiment 2 is arranged differently.

[0124] Specifically, refer to Figure 2 , Figure 3 , Figure 4 and Figure 5b ,as well as Figure 12 and Figure 15 As shown, the second circuit board 6b is also suitable for connecting the battery pack 3 and the drive motor 20, and the inner side of the back frame 1 is provided with a second mounting part 28 for connecting and mounting the second circuit board 6b.

[0125] The second mounting part 28 is located upstream of the air inlet of the fan 21. The second circuit board 6b and a second heat sink 9b are combined and embedded in the second mounting part 28. At least part of the heat dissipation outer surface of the second heat sink 9b is exposed in the main air duct 22.

[0126] When fan 21 is running, the high-speed airflow in the main air duct 22 can directly flow over the second heat sink 9b, quickly carrying away the heat generated by the second circuit board 6b, greatly improving heat dissipation efficiency. Moreover, since it is located upstream of the air inlet of fan 21, the airflow passes through the second heat sink 9b before entering fan 21, making full use of the airflow characteristics to achieve active heat dissipation of the second circuit board 6b and avoiding local heat accumulation.

[0127] Furthermore, the aforementioned first air cooling channel 4a is connected to the second mounting portion 28, so that the cable connecting the battery pack 3 and the second circuit board 28 is at least partially confined within the first air cooling channel 4a.

[0128] It should be noted that when the backpack blower is equipped with only one circuit board, it can adopt the technical solution described in Example 1 or the technical solution described in Example 2 to achieve effective heat dissipation of both the battery pack and the circuit board.

[0129] In yet another embodiment 3, Continue to refer to Figures 3 to 7 ,as well as Figure 16 As shown, battery pack 3 includes a first battery pack 3a and a second battery pack 3b.

[0130] The air outlets 31 of the first battery pack 3a and the second battery pack 3b are respectively connected to the hollow cavity 1011, and the two share the first cooling section 40a.

[0131] On the one hand, the first battery pack 3a and the second battery pack 3b share the first cooling section 40a, which allows for the concentrated use of cooling resources. The two heat sources share a cooling area, which can remove heat more quickly and improve the overall cooling efficiency. At the same time, it saves space and reduces the space required to set up a separate cooling channel for each battery pack, making the whole structure more compact.

[0132] Furthermore, it should be noted that continued reference... Figures 3 to 7 As shown, this embodiment also includes a first circuit board 6a and a second circuit board 6b;

[0133] The first battery pack 3a and the second battery pack 3b are electrically connected to the drive motor via the first circuit board 6a and the second circuit board 6b. The inner side of the back frame 1 is provided with a first mounting part 27 for connecting and mounting the first circuit board 6a and a second mounting part 28 for connecting and mounting the second circuit board 6b; as well as a first air cooling channel 4a and a second air cooling channel 4b.

[0134] The first air cooling channel 4a is formed on the inner side of the back frame 1 as described above. One end is connected to the air outlet 31 of the heat dissipation air duct of any battery pack, and the other end is connected to the main air duct 22 of the blower assembly 2 via the first negative pressure inlet 7.

[0135] The second air cooling channel 4b is formed on the inner side of the back frame 1 as described above. One end is connected to the first mounting part 27 of the first circuit board 6a for airflow, and the other end is connected to the main air duct 22 of the blower assembly 2 through the second negative pressure inlet 8.

[0136] The second mounting part 28 is located upstream of the air inlet of the fan 21. The second circuit board 6b and a second heat sink 9b are combined and embedded in the second mounting part 28. At least part of the heat dissipation outer surface of the second heat sink 9b is exposed in the main air duct 22.

[0137] This technical solution offers comprehensive heat dissipation. By establishing a first air cooling channel and a second air cooling channel, heat is dissipated from the first battery pack, the second battery pack, and the first circuit board, respectively. Simultaneously, the second circuit board is combined with a second heat sink and embedded in a second mounting portion upstream of the fan inlet, ensuring that at least a portion of the heat sink's outer surface is exposed to the main airflow. This allows the airflow from the main airflow to further dissipate heat from the second circuit board. This multi-directional heat dissipation design effectively reduces the temperature of key components, improving the stability and reliability of the equipment.

[0138] Furthermore, a first mounting part and a second mounting part are provided inside the back frame to connect and mount the first circuit board and the second circuit board, respectively, while forming corresponding air cooling channels. This layout makes full use of the internal space of the back frame, making the entire equipment structure more compact.

[0139] In addition, the air inlet duct 24 is provided with holes 220 and 221 that are respectively connected to the first air cooling channel 4a and the second air cooling channel 4b to form the first negative pressure inlet 7 and the second negative pressure inlet 8; and an opening corresponding to the second heat sink 9b, so that at least part of the heat dissipation outer surface of the second heat sink 9b is exposed in the main air duct 22.

[0140] The first air cooling channel 4a is connected to the second mounting part 28, so that the cable connecting the battery pack and the second circuit board 6b is at least partially confined in the first air cooling channel 4a.

[0141] Furthermore, the second mounting section 28 and the first mounting section 27 are connected by a wiring channel 29 (see reference). Figure 4 , Figure 5a (as shown), so that the cable connecting the first circuit board 6a and the second circuit board 6b is at least partially confined in the wiring channel 29.

[0142] That is, in this embodiment 3, after the battery pack is connected to the second circuit board 6b via the first cable C1, it is then connected to the first circuit board 6a via the second cable C2. At this time, the first cable C1 can be limited in the first air cooling channel 4a, and the second cable C2 can be limited in the wiring channel 29.

[0143] Therefore, this application may also relate to a backpack blower, comprising:

[0144] Back support frame;

[0145] A blower assembly, disposed within the backpack frame, the blower assembly including a drive motor and a fan;

[0146] A battery pack is adapted to provide power to the drive motor to drive the motor to rotate the fan and generate airflow through the main air duct of the blower assembly;

[0147] Its characteristic is that it further includes:

[0148] An air cooling channel is formed on the inner wall side of the back frame, with one end connected to the inner cavity of the battery pack and the other end extending to connect to the main air duct of the blower assembly.

[0149] A cable adapted to connect the battery pack and the drive motor to transmit power supplied by the battery pack to the drive motor, the cable being at least partially confined within the air cooling channel and not completely blocking the air cooling channel;

[0150] When the blower assembly receives power and rotates, a high-speed airflow is formed in the main air duct. The end of the air cooling channel connected to the main air duct forms a negative pressure inlet to guide the airflow inside the battery pack into the main air duct through the air cooling channel.

[0151] or;

[0152] A backpack blower, comprising:

[0153] Back support frame;

[0154] A blower assembly, disposed within the backpack frame, the blower assembly including a drive motor and a fan;

[0155] A battery pack is adapted to supply power to the drive motor to drive the motor to rotate the fan and generate airflow through the main air duct of the blower assembly; the battery pack has a heat dissipation duct, including an air inlet and an air outlet communicating with the inner cavity of the battery pack, and...

[0156] A first circuit board is adapted to connect the battery pack and the drive motor, and a mounting part for connecting and mounting the first circuit board is correspondingly provided on the inner side of the backpack frame.

[0157] Its characteristic is that it further includes:

[0158] A first air cooling channel, which is connected to the air outlet of the heat dissipation duct of the battery pack, is configured to dissipate heat and cool the battery pack.

[0159] The second air cooling channel, which is connected to the airflow of the mounting part of the first circuit board, is configured to dissipate heat and cool the first circuit board.

[0160] The first air cooling channel and the second air cooling channel are connected by a wiring channel, so that the cable C for transmitting power to the battery pack passes through the first air cooling channel and extends through the wiring channel toward the second air cooling channel, so that the other end of the cable C is connected to the first circuit board.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A backpack blower, comprising: Carrying frame; A blower assembly, disposed within the backpack frame, the blower assembly including a drive motor and a fan; A battery pack is adapted to provide power to the drive motor to drive the motor to rotate the fan and generate airflow through the main air duct of the blower assembly; The battery pack has a heat dissipation duct, including an air inlet and an air outlet that connect to the inner cavity of the battery pack. Its characteristic is that it further includes: The first air cooling channel is formed on the inner side of the back frame, with one end connected to the air outlet of the heat dissipation duct of the battery pack, and the other end connected to the main air duct of the blower assembly via the first negative pressure inlet.

2. The backpack blower according to claim 1, characterized in that: The inner wall of the back frame is provided with an integrally formed recessed groove, which is configured as part of the first air cooling channel.

3. The backpack blower according to claim 1 or 2, characterized in that: The first air cooling channel is formed on the inner periphery of the back frame and extends from the battery mounting part to the blower assembly mounting part; The battery mounting portion is adapted to install and connect the battery pack, and the blower assembly mounting portion is adapted to install and connect the blower assembly.

4. The backpack blower according to claim 3, characterized in that: The inner wall of the backpack frame extends outward to form a hollow groove to at least partially form the first air cooling channel, the hollow groove extending from the battery mounting portion to the blower assembly mounting portion.

5. The backpack blower according to claim 4, characterized in that: The battery mounting part includes a battery mounting base with a hollow cavity, which is fixedly connected to the inner side of the back frame so that the hollow cavity and the hollow groove cooperate to form the first cooling section of the first air cooling channel; The blower assembly mounting section is provided with a pressure cover, which matches the shape of the hollow groove to form the second cooling section of the first air cooling channel.

6. The backpack blower according to claim 5, characterized in that: One end of the pressure cap extends toward the battery mounting base to abut against it.

7. The backpack blower according to claim 6, characterized in that: The cap is at least partially arc-shaped to form part of the arc-shaped wall of the blower assembly mounting portion.

8. The backpack blower according to claim 3, characterized in that, Also includes: A first circuit board, adapted to connect the battery pack and the drive motor, and a first mounting portion for connecting and mounting the first circuit board is correspondingly provided on the inner side of the backpack frame; and, The second air cooling channel is formed on the inner side of the back frame. One end is connected to the airflow of the first mounting part of the first circuit board, and the other end is connected to the main air duct of the blower assembly through the second negative pressure inlet.

9. The backpack blower according to claim 8, characterized in that: The first circuit board is connected to the first mounting portion by a mounting connector, the mounting connector having a channel that is configured as part of the second air cooling channel.

10. The backpack blower according to claim 8 or 9, characterized in that: The first negative pressure inlet and / or the second negative pressure inlet are located upstream of the air inlet of the fan and are connected to the upstream side of the main air duct.

11. The backpack blower according to claim 10, characterized in that, Also includes: An air inlet duct is disposed on the inner wall of the air inlet section of the back frame; The air inlet duct has holes that are respectively connected to the first air cooling channel and the second air cooling channel to form the first negative pressure inlet and the second negative pressure inlet.

12. The backpack blower according to claim 8 or 9, characterized in that: The second air cooling channel and the first mounting portion of the first circuit board are formed on the inner bottom side of the back frame, located below the blower assembly mounting portion.

13. The backpack blower according to claim 12, characterized in that: An air inlet is provided on the side of the first mounting part opposite to the second negative pressure inlet, and the air inlet passes through the back frame and connects to the outside.

14. The backpack blower according to claim 13, characterized in that: The inner bottom side of the back frame has an extension that extends inward and protrudes towards the first circuit board near the first mounting part. The extension has a through-hole that communicates with the outside to form the air inlet.

15. The backpack blower according to claim 12, characterized in that, Also includes: The first heat sink is connected to the first circuit board; The component housing is positioned and connected to the first circuit board and the first heat sink. The heat sink fins of the first heat sink are spaced apart from the inner wall of the component housing to form an airflow channel, which constitutes part of the second air cooling channel.

16. The backpack blower according to claim 15, characterized in that: The carrying frame includes a support member near the side of the person carrying the load, and the inner bottom side of the support member is provided with a first half-channel. The component housing has a second half-channel at one end near the second negative pressure inlet; When the component housing is positioned and installed on the first mounting part, the first half-channel and the second half-channel are adapted and matched to form a guide channel that is connected to the airflow channel. The guide channel is connected to the second negative pressure inlet and constitutes part of the second air cooling channel.

17. The backpack blower according to claim 8, characterized in that, Also includes: A second circuit board is adapted to connect the battery pack and the drive motor, and a second mounting part for connecting and mounting the second circuit board is correspondingly provided on the inner side of the backpack frame. The second mounting part is located upstream of the air inlet of the fan. The second circuit board and a second heat sink are combined and embedded in the second mounting part. At least part of the heat dissipation outer surface of the second heat sink is exposed in the main air duct.

18. The backpack blower according to claim 17, characterized in that, Also includes: An air inlet duct is disposed on the inner wall of the air inlet section of the back frame; The air inlet duct has an opening corresponding to the second heat sink, so that at least part of the heat dissipation outer surface of the second heat sink is exposed in the main air duct.

19. The backpack blower according to claim 17, characterized in that: The first air cooling channel communicates with the second mounting part, such that the cable connecting the battery pack and the second circuit board is at least partially confined within the first air cooling channel.

20. The backpack blower according to claim 19, characterized in that: The second mounting portion is connected to the first mounting portion adapted to mount the first circuit board via a wiring channel, such that the cable connecting the first circuit board and the second circuit board is at least partially confined within the wiring channel.

21. The backpack blower according to claim 20, characterized in that: A narrowing section is provided between the first air cooling channel and the wiring channel. The narrowing section is configured to reduce the diameter of the connection between the first air cooling channel and the wiring channel, and to clamp the cable.

22. The backpack blower according to claim 21, characterized in that: The cable clamped in the constricted portion forms a barrier with the constricted portion to block the main airflow flowing in the first air cooling channel from communicating with the main airflow flowing in the second air cooling channel.

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