Duct assembly and garden blower

Abstract

This application relates to the field of garden power tools, specifically disclosing a duct assembly and a garden blower. The duct assembly includes a motor bracket, an outer duct connected to the motor bracket at one end, and a motor fan blade assembly installed inside the motor bracket. Additionally, a guide vane is connected to the end of the outer duct. The guide vane includes an integrally formed guide cone and an air outlet grille. One end of the guide cone is quick-connected to the end of the outer duct. The outer wall of the air outlet grille is circumferentially spaced from the inner wall of the outer duct. The air outlet grille includes a connecting portion and a supporting portion. One end of the connecting portion is connected to the guide cone, and the other end is connected to the supporting portion. Multiple connecting portions are circumferentially spaced between the supporting portion and the guide cone. A circumferential gap is formed between the outer wall of the supporting portion and the inner wall of the outer duct. The guide vane of this application adopts a design where the guide cone and air outlet grille are integrally formed, reducing the number of parts and assembly steps, lowering manufacturing costs and assembly complexity.

Description

Technical Field

[0001] This application relates to the field of garden power tools, specifically to a duct component and a garden blower. Background Technology

[0002] The duct assembly is one of the core components of a power blower, and its design directly affects the aerodynamic efficiency, noise level, heat dissipation performance, as well as the compactness and ease of assembly of the overall structure.

[0003] In existing ducted systems, a typical design includes a motor bracket, an outer duct, and a motor fan assembly mounted inside the motor bracket. The airflow generated by the fan's rotation is primarily guided to the outlet via the outer duct. However, this design has some inherent drawbacks:

[0004] The airflow pattern at the duct outlet is crucial to efficiency and noise levels. In existing designs, improperly designed outlet guide structures (such as guide cones or grilles) can lead to turbulent airflow, separation, or eddies. This not only reduces exhaust efficiency but also generates significant aerodynamic noise. Furthermore, the guide components at the duct end are typically modular, requiring additional connectors and assembly steps. This not only increases the number of parts and cost but also makes the assembly process relatively cumbersome, impacting production efficiency. Utility Model Content

[0005] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the prior art and provide a duct component.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A duct component, comprising:

[0008] Motor bracket;

[0009] The outer duct, one end of which is connected to the motor bracket;

[0010] The motor fan blade assembly is installed inside the motor bracket;

[0011] A flow guide is installed on the inner side of the outer duct. The flow guide includes an integrally set flow guide cone and an air outlet grille. One end of the flow guide cone is quick-connected to the motor bracket. The outer wall of the air outlet grille is circumferentially spaced from the inner wall of the outer duct.

[0012] Furthermore, the air outlet grille includes a connecting part and a supporting part. One end of the connecting part is connected to the guide cone, and the other end is connected to the supporting part. A circumferential gap is formed between the outer wall of the supporting part and the inner wall of the outer duct.

[0013] Furthermore, the motor fan assembly includes a motor, a fan blade connected to the motor, and a mounting bracket supported inside the motor bracket. The motor is disposed inside the mounting bracket and fixedly connected to the mounting bracket by a fastener, wherein the mounting bracket is constructed as part of the motor bracket.

[0014] Furthermore, in the flow guide cone and the mounting bracket, one is connected to a buckle, and the other is provided with a slot corresponding to the buckle. The flow guide cone and the mounting bracket are connected to each other by the buckle and the slot.

[0015] Furthermore, the circumferential gap is less than 20 mm.

[0016] Furthermore, the outer bypass duct, motor bracket, mounting bracket, and guide cone are coaxially installed.

[0017] Furthermore, a first flow path is formed between the outer wall of the guide cone and the inner wall of the outer duct, and a second flow path is formed by connecting the guide cone with the inner cavity of the mounting frame.

[0018] Part of the airflow generated by the rotation of the fan blades flows through the first guide path and is directed out of the air grid, while another part of the airflow generated by the rotation of the fan blades flows through the motor and flows out from the port of the guide cone along the second guide path.

[0019] The beneficial technical effects of the duct component provided in this application compared with the prior art are as follows: 1. The guide component of this application adopts a design of integral molding of the guide cone and the air outlet grid, which reduces the number of parts and assembly steps, and reduces manufacturing costs and assembly complexity;

[0020] 2. The integrated guide cone and exhaust grille structure, along with the circumferential spacing, work together to smoothly guide and organize the outlet airflow. This effectively reduces airflow turbulence, separation, and eddy currents, thereby improving airflow concentration and exhaust efficiency. Simultaneously, the smoother airflow significantly reduces aerodynamic noise caused by airflow disturbances, enhancing user comfort, especially in noise-sensitive garden environments.

[0021] Another technical solution adopted in this application is: to provide a garden blower, including a housing, the above-mentioned duct assembly and a purge pipe, wherein the duct assembly is disposed inside the housing, and the purge pipe is connected to the outer duct of the duct assembly.

[0022] Furthermore, the outer duct is constructed as part of the shell.

[0023] Furthermore, the inner wall of the housing has a limiting groove, and the end of the motor bracket has a flange that engages with the limiting groove.

[0024] The garden blower of this application, by adopting the aforementioned duct component, reduces the number of parts and assembly steps, lowers manufacturing costs and assembly complexity, and effectively reduces airflow turbulence, separation, and vortex generation, thereby improving airflow concentration and exhaust efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the duct component in Embodiment 1 of this application.

[0027] Figure 2 This is a cross-sectional schematic diagram of the duct assembly in Embodiment 1 of this application.

[0028] Figure 3 for Figure 2 Another structural diagram from another angle.

[0029] Figure 4 This is an exploded view of the duct assembly in Embodiment 1 of this application.

[0030] Figure 5 This is a schematic diagram of the garden blower in Embodiment 2 of this application.

[0031] Figure 6 This is a schematic diagram of the internal structure of the garden blower in Embodiment 2 of this application.

[0032] Figure 7 This is a partial cross-sectional schematic diagram of the garden blower in Embodiment 2 of this application. Detailed Implementation

[0033] Example 1

[0034] Reference Figure 1 A duct assembly 100 includes a motor bracket 10, an outer duct 20 connected to the motor bracket 10 at one end, and a motor fan blade assembly 30 installed inside the motor bracket 10. In addition, a guide member is provided on the inner side of the end of the outer duct 20. The guide member includes an integrally formed guide cone 40 and an air outlet grille 50. One end of the guide cone 40 is quick-connected to the end of the motor bracket 10, and the outer wall of the air outlet grille 50 is circumferentially spaced from the inner wall of the outer duct 20.

[0035] Furthermore, refer to Figure 2 , Figure 3 , Figure 4The air outlet grille 50 includes a connecting part 501 and a supporting part 502. One end of the connecting part 501 is connected to the guide cone 40, and the other end is connected to the supporting part 502. There are multiple connecting parts 501, which are circumferentially spaced between the supporting part 502 and the guide cone 40. A circumferential gap 60 is formed between the outer wall of the supporting part 502 and the inner wall of the outer duct 20. In actual implementation, the size of the circumferential gap 60 is less than 20mm.

[0036] The guide component of this application adopts a design in which the guide cone 40 and the air outlet grille 50 are integrally formed, which reduces the number of parts and assembly steps, and reduces manufacturing costs and assembly complexity.

[0037] The integrated guide cone and air outlet grille structure, along with the circumferential spacing of the air outlet grille 50, work together to guide and streamline the outlet airflow more smoothly. This effectively reduces airflow turbulence, separation, and eddy currents, thereby improving airflow concentration and outlet efficiency. At the same time, the smoothing of the airflow significantly reduces aerodynamic noise caused by airflow disturbance, enhancing user comfort, especially in noise-sensitive garden work environments.

[0038] Furthermore, the motor fan assembly 30 includes a motor 301, a fan blade 302 connected to the output shaft of the motor 301, and a mounting bracket 303 supported inside the motor bracket 10. The motor 301 is located inside the mounting bracket 303 and is fixedly connected to the mounting bracket 303 by a fastener. When the motor 301 rotates, it provides rotational power to the fan blade 302.

[0039] In this embodiment, the mounting bracket 303 and the motor bracket 10 are integrally formed. The mounting bracket 303 is part of the motor bracket 10, and one end of the guide cone 40 is quickly connected to the mounting bracket 303.

[0040] To facilitate the installation of the flow guide, the flow guide cone 40 and the mounting bracket 303 are respectively connected with a buckle 401 and have a corresponding slot 303a on the other. The flow guide cone 40 and the mounting bracket 303 are connected to each other by the buckle 401 and the slot 303a. In specific implementation, the buckle 401 is installed at the end of the flow guide cone 40 and the slot 303a is installed on the mounting bracket 303. This realizes quick positioning and reliable connection between the flow guide cone 40 and the mounting bracket 303, which greatly simplifies the assembly process, improves production efficiency, and facilitates subsequent maintenance and disassembly.

[0041] In this embodiment, the outer duct 20, motor bracket 10, mounting bracket 303, and guide cone 40 are coaxially mounted, with a circumferential gap 60 of less than 20mm. This maximizes the use of the internal space of the outer duct 20 while ensuring airflow guidance and structural strength. The coaxial mounting requirements of the outer duct 20, motor bracket 10, mounting bracket 303, and guide cone 40 ensure smooth flow within the entire duct assembly 100 and a highly compact structure, which is beneficial for the miniaturization and lightweight design of equipment (such as garden blowers).

[0042] Specifically, when the duct assembly 100 is implemented, a first flow path is formed between the outer wall of the guide cone 40 and the inner wall of the outer duct 20, and a second flow path is formed by the connection between the guide cone 40 and the inner cavity of the mounting bracket 303.

[0043] Part of the airflow generated by the rotation of the fan blade 302 flows through the first guide path and is directed out of the air grid 50. Another part of the airflow generated by the rotation of the fan blade 302 flows through the motor 301 and flows out from the port of the guide cone 40 along the second guide path.

[0044] This significantly improves the cooling efficiency of the motor, effectively preventing overheating of the motor 301 under prolonged high-load operation, and extending the service life and reliability of the motor 301 and the entire machine. This is a major improvement over traditional duct designs that only focus on the main airflow and neglect the active cooling of the motor. Moreover, during the rotation of the fan blades 302 driven by the motor 301, the main airflow in the outer duct 20 flows out through the circumferential gap 60 between the support 502 and the outer duct 20, as well as the gap between adjacent connecting parts 501, when it flows towards the air outlet grille 50, resulting in lower airflow resistance.

[0045] Example 2

[0046] Reference Figure 5 , Figure 6 , Figure 7 A garden blower 200 includes a housing 210, the aforementioned duct assembly 100 installed within the housing 210, and a purge pipe 220 connected to the duct assembly 100.

[0047] To facilitate the connection between the outer duct 20 and the motor bracket 10, in this embodiment, the outer duct 20 is constructed as part of the housing 210. The inner wall of the housing 210 has a limiting groove 230, and the end of the motor bracket 10 has a flange 101. When the motor bracket 10 is installed, the flange 101 near the end of the outer duct 20 engages with the limiting groove 230. The motor bracket 10 is installed by the engaging method, which is secure. Moreover, after being engaged, the flange 101 at the end of the motor bracket 10 will fit against one end of the outer duct 20, and the splicing and sealing of the motor bracket 10 and the outer duct 20 is good.

[0048] The garden blower 200 of this application, by adopting the aforementioned duct component 100, reduces the number of parts and assembly steps, lowers manufacturing costs and assembly complexity, and effectively reduces airflow turbulence, separation and vortex generation, thereby improving airflow concentration and exhaust efficiency.

[0049] 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 duct assembly, comprising: Motor bracket; The outer duct, one end of which is connected to the motor bracket; A motor fan blade assembly, which is installed on the inner side of the motor bracket; The feature is that a flow guide is installed on the inner side of the outer duct, the flow guide includes an integrally formed flow guide cone and an air outlet grid, one end of the flow guide cone is quickly connected to the motor bracket, and the outer wall of the air outlet grid is circumferentially spaced from the inner wall of the outer duct.

2. The duct assembly according to claim 1, characterized in that, The air outlet grille includes a connecting part and a supporting part. One end of the connecting part is connected to the guide cone, and the other end is connected to the supporting part. A circumferential gap is formed between the outer wall of the supporting part and the inner wall of the outer duct.

3. The duct assembly according to claim 1, characterized in that, The motor fan assembly includes a motor, a fan blade connected to the motor, and a mounting bracket supported inside the motor bracket. The motor is disposed inside the mounting bracket and fixedly connected to the mounting bracket by a fastener, wherein the mounting bracket is constructed as part of the motor bracket.

4. The duct assembly according to claim 3, characterized in that, The guide cone and the mounting bracket are connected by a buckle on one and a slot corresponding to the buckle on the other. The guide cone and the mounting bracket are connected to each other by the buckle and the slot.

5. The duct assembly according to claim 2, characterized in that, The size of the circumferential gap is less than 20 mm.

6. The duct assembly according to claim 3, characterized in that, The outer duct, motor bracket, mounting bracket, and guide cone are coaxially mounted.

7. The duct assembly according to claim 3, characterized in that, A first flow path is formed between the outer wall of the guide cone and the inner wall of the outer duct, and a second flow path is formed between the guide cone and the inner cavity of the mounting frame. A portion of the airflow generated by the rotation of the fan blades flows through the first guide path and is directed to the air outlet grid. Another portion of the airflow generated by the rotation of the fan blades flows through the motor and exits from the port of the guide cone along the second guide path.

8. A garden blower, characterized in that, include: case; The duct assembly according to any one of claims 1-7 is disposed within the housing; The purge pipe is connected to the outer duct.

9. The garden blower according to claim 8, characterized in that, The outer duct is constructed as part of the housing.

10. The garden blower according to claim 8, characterized in that, The inner wall of the housing has a limiting groove, and the end of the motor bracket has a flange that engages with the limiting groove.

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