Duct assembly and garden air blower

By setting spiral grooves on the surface of the motor bracket of the garden blower, the problem of smaller gaps in the air blades caused by the deformation of the motor bracket under high-frequency vibration is solved, and the effect of stable operation of the air blades and noise reduction is achieved, while improving the heat dissipation effect.

CN222771395UActive Publication Date: 2025-04-18ZHEJIANG SUNSEEKER IND CO LTD
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Patent Information

Application Number
CN202421433603.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Priority Date
2024-03-28
Filing Date
2024-06-21
Publication Date
2025-04-18
Estimated Expiration
2034-06-21

AI Technical Summary

Technical Problem

When existing garden blowers are vibrating at high frequency, the motor bracket is prone to slight deformation, resulting in a smaller gap between the air blades and the inner wall of the motor bracket, causing noise or damage to the air blades.

Method used

Set spiral grooves on the surface of the motor bracket to improve deformation resistance, ensure that the gap between the outer edge of the rotating trajectory of the air blade and the inner wall of the motor bracket is less than 1mm, and prevent the air blade from touching.

Benefits of technology

By setting up a spiral groove, the deformation amplitude of the motor bracket is less than 1mm, ensuring stable operation of the air blades, avoiding noise and damage, and improving the airflow smoothness of the air supply channel and the motor's heat dissipation effect.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of garden electric tools, and particularly discloses a duct assembly and a garden air blower. The duct assembly comprises a motor support, an outer duct connected with the motor support and a motor fan blade assembly arranged on the inner side of the motor support; the motor fan blade assembly comprises a motor and fan blades connected with the motor, the motor provides rotating power for the fan blades, a spiral groove is formed in the surface of a motor support, when the fan blades rotate at a high speed, the deformation resistance of the motor support can be greatly improved, the outer edge of the rotating track of the fan blades serves as a datum plane, and the deformation amplitude of the motor support is smaller than 1 mm. When the fan blade is installed on the inner side of the motor support, the gap between the outer edge of the fan blade and the inner wall of the motor support can be set to be smaller than 1 mm, and in the range of 1 mm, when the fan blade rotates at a high speed, the end of the fan blade does not make contact with the inner wall of the motor support, and therefore it can be guaranteed that the gap between the outer edge of the rotating track of the fan blade and the inner wall of the motor support is small; and the working stability of the fan blades can be ensured.
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Description

Technical Field

[0001] The present application relates to the field of garden power tools, and in particular to a duct assembly and a garden blower. Background Art

[0002] The garden blower includes a casing and a motor bracket arranged in the casing. One end of the motor bracket is connected to the air supply duct, and the other end corresponds to the air inlet chamber inside the casing. The motor is fixedly installed on the inner side of the motor bracket, and the power output end of the motor is connected to the fan blade. After the motor is started, the gas in the air inlet chamber is introduced into the air supply duct at high speed through the fan blade and blown out from the end of the casing.

[0003] In actual use of a garden blower, the smaller the gap between the outer edge of the blade's rotation track and the inner wall of the motor bracket, the better in theory. This is because the smaller the gap between the outer edge of the blade's rotation track and the inner wall of the motor bracket, the gas on one side of the blade can be basically completely introduced into the air supply duct by the blade, and the gap between the outer edge of the blade and the inner wall of the motor bracket will not produce gas turbulence. The smaller the gap, the smaller the gas turbulence. However, in actual research and development, it was found that after the motor is started, under high-frequency vibration, the motor bracket is prone to slight deformation. If the gap between the outer edge of the blade's rotation track and the inner wall of the motor bracket is too small, the end of the blade can easily touch the inner wall of the motor bracket, resulting in loud noise or damage to the blade. Therefore, how to ensure that the gap between the outer edge of the blade's rotation track and the inner wall of the motor bracket is small while ensuring the stability of the blade's operation is a technical problem that needs to be solved at present. Utility Model Content

[0004] The purpose of at least one specific implementation of the present utility model is to solve the defects of the prior art and provide a duct assembly.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A duct assembly, comprising:

[0007] Motor bracket;

[0008] An outer duct, one end of which is connected to one end of the motor bracket;

[0009] A motor fan blade assembly is installed on the inner side of the motor bracket;

[0010] The surface of the motor bracket is provided with a spiral groove;

[0011] The motor fan blade assembly comprises a fan blade, and the gap between the outer edge of the fan blade rotation track and the inner wall of the motor bracket is less than 1mm.

[0012] Through the above technical solution, after the spiral grooves are arranged on the surface of the motor bracket, the deformation resistance of the motor bracket can be greatly improved when the fan blade rotates at a high speed. Taking the outer edge of the fan blade's rotation trajectory as the reference plane, the deformation amplitude of the motor bracket is less than 1mm. When the fan blade is installed on the inner side of the motor bracket, the gap between the outer edge of the fan blade and the inner wall of the motor bracket can be set to be less than 1mm. Within the range of 1mm, when the fan blade rotates at a high speed, its end will not touch the inner wall of the motor bracket. In this way, the gap between the outer edge of the fan blade's rotation trajectory and the inner wall of the motor bracket can be kept small while ensuring the stability of the fan blade's operation.

[0013] Furthermore, the groove pitch of the spiral groove is less than 2 mm.

[0014] Furthermore, the motor fan blade assembly also includes a motor, which is connected to the fan blade and provides rotational power for the fan blade.

[0015] Furthermore, a mounting frame is provided on the inner side of the motor bracket, and the motor is arranged on the inner side of the mounting frame and fixedly connected to the mounting frame through a fixing piece.

[0016] Furthermore, a guide cone is provided on the inner side of the outer duct, a support sleeve is provided at one end of the outer duct, one end of the guide cone is connected to the mounting frame, and the other end is connected to the support sleeve.

[0017] Through the above technical solution, after the guide cone is installed, the outer peripheral surface of the guide cone and the inner wall surface of the outer duct form an air supply channel, and the inner cavity of the guide cone forms a heat dissipation channel of the motor, wherein the outer peripheral surface of the guide cone is a conical surface, which can improve the smoothness of the airflow in the air supply channel. After the motor is started, the gas in the air inlet cavity is introduced into the air supply channel at high speed through the fan blades and blown out from the end of the casing, thereby achieving a purging effect. At the same time, a small part of the gas may penetrate the interior of the motor and enter the heat dissipation channel. After the airflow in the heat dissipation channel takes away the heat generated by the motor, it is blown out from the end of the casing, thereby playing a heat dissipation role for the motor.

[0018] Furthermore, a first boss is provided on the mounting frame, a second boss is provided on the supporting sleeve, one end of the guide cone is clamped with the first boss, and the other end of the guide cone is clamped with the second boss.

[0019] Through the above technical solution, the two ends of the guide cone are connected to the mounting frame and the support sleeve by snapping, and the guide cone is easy to disassemble and assemble.

[0020] Furthermore, the mounting frame is connected to the motor bracket through the first supporting frame, and the supporting sleeve is connected to the outer duct through the second supporting frame, thereby ensuring the stability of the installation of the mounting frame and the supporting sleeve.

[0021] Furthermore, a connecting part is provided at one end of the motor bracket, a buckle is provided on one of the connecting part and the outer duct, and a slot is provided on the other of the connecting part and the outer duct. The connecting part and the outer duct are engaged with the buckle and the slot, so that the outer duct and the motor bracket are conveniently connected.

[0022] Furthermore, the outer duct, the motor bracket, the mounting frame, the guide cone and the support sleeve are coaxially installed.

[0023] The beneficial technical effect of the duct assembly provided by the present application compared with the prior art is that after the spiral groove is set on the surface of the motor bracket of the present application, the deformation resistance of the motor bracket can be greatly improved when the fan blade rotates at high speed. Taking the outer edge of the rotation trajectory of the fan blade as the reference plane, the deformation amplitude of the motor bracket is less than 1mm. When the fan blade is installed on the inner side of the motor bracket, the gap between the outer edge of the fan blade and the inner wall of the motor bracket can be set to less than 1mm. Within the range of 1mm, when the fan blade rotates at high speed, its end will not touch the inner wall of the motor bracket. In this way, the gap between the outer edge of the rotation trajectory of the fan blade and the inner wall of the motor bracket can be kept small while ensuring the stability of the fan blade operation.

[0024] Another technical solution adopted by the present application is to provide a garden blower, including the above-mentioned duct assembly.

[0025] Through the above technical solution, the garden blower provided in this application adopts the above duct assembly to improve the deformation resistance of its internal motor bracket. When the fan blades on the inner side of the motor bracket are installed, the gap between the outer edge of the fan blades and the inner wall of the motor bracket can be reduced to within 1 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of the structure of a duct assembly in a certain embodiment of the present application;

[0028] Figure 2 It is a front view schematic diagram of a duct assembly in a certain embodiment of the present application;

[0029] Figure 3 This is a front view of a fan blade in an embodiment of the present application;

[0030] Figure 4 for Figure 2 Schematic diagram of the cross section along line AA;

[0031] Figure 5 for Figure 2 Schematic diagram of the cross section along line BB;

[0032] Figure 6 for Figure 4 A schematic diagram of the structure at another angle;

[0033] Figure 7 This is a schematic diagram of the structure of the garden blower in Example 2 of the present application;

[0034] Figure 8 This is a cross-sectional schematic diagram of the garden blower in Example 2 of the present application. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Example 1

[0037] Reference Figures 1 to 4 , a duct assembly 100, comprising a motor bracket 10, an outer duct 11 connected to the motor bracket 10, and a motor fan blade assembly 20 arranged inside the motor bracket 10;

[0038] The motor fan blade assembly 20 includes a motor 201 and a fan blade 202 connected to the motor 201. The motor 201 provides rotational power for the fan blade 202. A mounting frame 101 is provided on the inner side of the motor bracket 10. The motor 201 is arranged on the inner side of the mounting frame 101 and is fixedly connected to the mounting frame 101 through a fixing member 102. The mounting frame 101 is fixedly connected to the motor bracket 10 through a first supporting frame 103. The mounting frame 101 is used to fix the motor 201.

[0039] In this embodiment, the surface of the motor bracket 10 is provided with a spiral groove 30, the groove spacing L1 of the spiral groove 30 is less than 2 mm, and the gap L2 between the outer edge 20a of the rotation track of the fan blade 202 and the inner wall 10a of the motor bracket 10 is less than 1 mm.

[0040] After the spiral groove 30 is set on the surface of the motor bracket 10, the deformation resistance of the motor bracket 10 can be greatly improved when the fan blade 202 rotates at a high speed. The test data shows that the deformation amplitude of the motor bracket 10 will be less than 1mm when the outer edge 20a of the fan blade's rotation trajectory is used as the reference plane. Therefore, when the fan blade 202 is installed on the inner side of the motor bracket 10, the gap L2 between the outer edge 20a of the fan blade's rotation trajectory and the inner wall 10a of the motor bracket 10 can be set to be less than 1mm. Within the range of 1mm, when the fan blade 202 rotates at a high speed, its end will not touch the inner wall 10a of the motor bracket 10. In this way, the gap between the outer edge 20a of the fan blade's rotation trajectory and the inner wall 10a of the motor bracket 10 is small, while the working stability of the fan blade 202 can be ensured.

[0041] Further, refer to Figure 5 , Figure 6 A guide cone 40 is provided on the inner side of the outer duct 11, and a support sleeve 111 is provided at one end of the outer duct 11. The support sleeve 111 is connected to the outer duct 11 through the second support frame 110. One end of the guide cone 40 is connected to the mounting frame 101, and the other end is connected to the support sleeve 111. Specifically, a first boss 104 is provided on the mounting frame 101, and a second boss 112 is provided on the support sleeve 111. One end of the guide cone 40 is clamped with the first boss 104, and the other end is clamped with the second boss 112. Both ends of the guide cone 40 are connected with the mounting frame 101 and the support sleeve 111 by clamping. The guide cone 40 is easy to disassemble and assemble. After the installation is completed, the outer duct 11, the motor bracket 10, the mounting frame 101, the guide cone 40 and the support sleeve 111 are coaxial.

[0042] After the guide cone 40 is installed, the outer peripheral surface of the guide cone 40 and the inner wall surface of the outer duct 11 form an air supply channel 50, and the inner cavity of the guide cone 40 forms a heat dissipation channel 60 of the motor, wherein the outer peripheral surface of the guide cone 40 is a conical surface, which can improve the smoothness of the airflow in the air supply channel 50. After the motor 201 is started, the gas in the air inlet cavity is introduced into the air supply channel 50 at high speed through the fan blades 202 and blown out from the end of the casing, thereby achieving a purging effect. At the same time, a small part of the gas may penetrate the interior of the motor 201 and enter the heat dissipation channel 60. After the airflow in the heat dissipation channel 60 takes away the heat generated by the motor 201, it is blown out from the end of the casing, thereby playing a heat dissipation role for the motor 201.

[0043] Furthermore, a connecting portion 105 is provided at one end of the motor bracket 10, and a buckle is provided on one of the connecting portion 105 and the outer duct 11, and a slot is provided on the other of the connecting portion 105 and the outer duct 11. The connecting portion 105 and the outer duct 11 are engaged with the buckle and the slot, so that the outer duct 11 and the motor bracket 10 are conveniently connected. Specifically, in this embodiment, a buckle 106 is provided on the connecting portion 105, and a slot 113 is provided on the outer duct 11. After the buckle 106 is engaged with the slot 113, the outer duct 11 and the motor bracket 10 are quickly connected.

[0044] Example 2

[0045] Reference Figure 7 , Figure 8 Based on the same technical concept, an embodiment of the present application provides a garden blower 200, which includes the duct assembly 100 in the above-mentioned embodiment 1. The garden blower 200 includes a casing 70, and the duct assembly 100 is installed in the casing 70. Correspondingly, it has the technical effect of the above-mentioned duct assembly 100. When the fan blades 202 in the casing 70 rotate at a high speed, the ends thereof will not touch the inner wall of the motor bracket 10. In this way, the gap between the outer edge of the fan blade rotation trajectory and the inner wall of the motor bracket can be kept small, while also ensuring the stability of the fan blade 202.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A duct assembly, comprising: Motor bracket; An outer duct, one end of which is connected to one end of the motor bracket; A motor fan blade assembly, which is installed on the inner side of the motor bracket; Characterized in that a spiral groove is provided on the surface of the motor bracket; The motor fan blade assembly includes a fan blade, and the gap between the outer edge of the fan blade rotation track and the inner wall of the motor bracket is less than 1 mm.

2. The duct assembly according to claim 1, characterized in that The groove pitch of the spiral groove is less than 2 mm.

3. The duct assembly according to claim 1, characterized in that The motor fan blade assembly also includes a motor, which is connected to the fan blade.

4. The duct assembly according to claim 3, characterized in that A mounting bracket is provided on the inner side of the motor bracket, and the motor is arranged on the inner side of the mounting bracket and fixedly connected to the mounting bracket through a fixing member.

5. The duct assembly according to claim 4, characterized in that A guide cone is provided on the inner side of the outer duct, a support sleeve is provided at one end of the outer duct, one end of the guide cone is connected to the mounting frame, and the other end is connected to the support sleeve.

6. The duct assembly according to claim 5, characterized in that The mounting frame is provided with a first boss, the supporting sleeve is provided with a second boss, one end of the guide cone is clamped with the first boss, and the other end is clamped with the second boss.

7. The duct assembly according to claim 5, characterized in that The mounting frame is connected to the motor bracket via a first supporting frame, and the supporting sleeve is connected to the outer duct via a second supporting frame.

8. The duct assembly according to claim 1, wherein: A connecting portion is provided at one end of the motor bracket, a buckle is provided on one of the connecting portion and the outer duct, a slot is provided on the other of the connecting portion and the outer duct, and the connecting portion and the outer duct are engaged with the slot via the buckle.

9. The duct assembly according to claim 5, characterized in that The outer duct, the motor bracket, the mounting frame, the guide cone and the support sleeve are coaxially mounted.

10. A garden blower, characterized in that: A duct assembly comprising any one of claims 1-9.