CN220108693U

CN220108693U - Grass mowing head and grass mowing machine

Info

Publication number: CN220108693U
Application number: CN202321489862.6U
Authority: CN
Inventors: 苑成龙; 王兜石; 李志锋
Original assignee: Globe Jiangsu Co Ltd
Current assignee: Globe Jiangsu Co Ltd
Priority date: 2023-06-12
Filing date: 2023-06-12
Publication date: 2023-12-01
Anticipated expiration: 2033-06-12

Abstract

The utility model provides a grass cutting head and a grass cutting machine, wherein the grass cutting head comprises a shell, a first cavity is formed in the shell, a first air outlet is formed at the opening of the first cavity, the shell is provided with an extension part extending outwards, and the extension part is provided with a first air inlet communicated with the first cavity; the motor component is arranged in the first cavity and is provided with a heat dissipation channel, the heat dissipation channel is provided with a second air inlet and a second air outlet, and a first fan blade used for generating flowing through the heat dissipation channel is arranged at the second air inlet; the wind shielding piece is arranged between the motor assembly and the first air inlet, and extends in the direction from the first air outlet to the top of the shell so as to be opposite to the direction of the air flow in the heat dissipation channel, so that the path of the air flow flowing from the first air inlet to the first air outlet is prolonged. According to the utility model, the wind shielding piece is arranged to optimize the air duct structure, so that the heat dissipation efficiency can be greatly improved.

Description

Grass mowing head and grass mowing machine

Technical Field

The utility model relates to a grass cutting head and a grass cutting machine, and belongs to the technical field of electric tools.

Background

At present, the maintenance and the dismantlement of motor are not considered in the current grass trimmer when the design, lead to the step of dismantling loaded down with trivial details, and need use more instrument, also probably damage spare part when dismantling, lead to the cost of maintenance higher. In addition, grass trimmer only can dispel the heat to beating grass head when the during operation, and can't dispel the heat to the PCB board simultaneously.

In view of the foregoing, it is necessary to provide a grass cutting head and a grass cutting machine for solving the above problems.

Disclosure of Invention

The utility model aims to provide a grass cutting head and a grass cutting machine, which can improve the disassembly and assembly efficiency and enhance the heat radiation capability.

In order to achieve the above object, the present utility model provides a grass cutting head, comprising:

the shell is internally provided with a first cavity, a first air outlet is formed at the opening of the first cavity, the shell is provided with an extension part which extends outwards, and the extension part is provided with a first air inlet communicated with the first cavity;

the motor assembly is arranged in the first cavity and is provided with a heat dissipation channel, the heat dissipation channel is provided with a second air inlet and a second air outlet, and a first fan blade used for generating flow through the heat dissipation channel is arranged at the second air inlet;

the wind shielding piece is arranged between the motor assembly and the first air inlet, and extends in the direction from the first air outlet to the top of the shell, so that the direction of the air flow in the heat dissipation channel is opposite to that of the air flow in the heat dissipation channel, and the path of the air flow flowing from the first air inlet to the first air outlet is prolonged.

As a further improvement of the utility model, the grass-mowing head comprises a first part and a second part which are mutually detachable, wherein the first part comprises the shell, the wind shielding piece and a plug-in sheet seat arranged in the wind shielding piece, the wind shielding piece is fixed in the shell, the second part comprises a base and a motor assembly, and the motor assembly is electrically connected with the plug-in sheet seat after the first part and the second part are fixedly arranged.

As a further improvement of the utility model, the motor assembly is an external rotor motor, the motor assembly comprises a stator assembly, a rotor assembly and an output shaft, the stator assembly is arranged around the output shaft, the rotor assembly is arranged around the stator assembly, and the first fan blade is connected with the rotor assembly and the output shaft so as to synchronously rotate along with the output shaft.

As a further improvement of the utility model, the base is arranged at the opening of the first cavity, the base is fixedly connected with the shell, a bearing is arranged between the base and the output shaft, the outer ring of the bearing is fixedly connected with the base, and the inner ring of the bearing is fixedly connected with the output shaft.

As a further improvement of the utility model, the wind shielding piece is connected with the base, a second cavity is formed in the wind shielding piece, the insert seat is arranged in the second cavity, and the insert seat is used for being electrically connected with the motor assembly.

As a further improvement of the utility model, the base is provided with a mounting opening for mounting the insert seat, the orthographic projection of the motor component on the plane of the base is not overlapped with the mounting opening, the mounting opening is provided with a baffle for shielding the mounting opening, and a wiring opening for passing through a power supply line is formed between the baffle and the base.

As a further improvement of the utility model, the outer side of the base is also provided with a second fan blade and a driving piece, the inner side of the driving piece is fixedly connected with the output shaft, and the outer side of the driving piece is in transmission connection with the second fan blade so as to drive the second fan blade to rotate around the output shaft.

As a further improvement of the utility model, the first fan blade and the second fan blade rotate synchronously, and the diameter of the second fan blade is larger than that of the first fan blade.

As a further improvement of the utility model, the first fan blade is an axial flow type, and the second fan blade is a centrifugal type.

In order to achieve the above object, the present utility model further provides a grass trimmer, including a connecting rod and a grass trimmer head, the grass trimmer head includes:

As a further improvement of the utility model, the grass cutting machine further comprises a handle assembly, wherein the handle assembly is provided with a third air inlet, and the interior of the connecting rod is communicated with and connected with the grass cutting head and the handle assembly, so that the first air inlet is communicated with the third air inlet.

The beneficial effects of the utility model are as follows: according to the utility model, the wind shielding piece is arranged between the motor assembly and the first air inlet to optimize the wind channel structure, and the extending direction of the wind shielding piece is opposite to the direction of the air flow in the heat dissipation channel, so that the path of the air flow flowing from the first air inlet to the first air outlet can be prolonged, and the heat dissipation efficiency is greatly improved.

Drawings

FIG. 1 is a schematic view of a grass-mowing head according to the present utility model.

FIG. 2 is a schematic cross-sectional view of a grass-mowing head according to the present utility model.

FIG. 3 is a schematic cross-sectional view of a removing housing of the grass cutting head of the present utility model.

FIG. 4 is a schematic view of a partially exploded construction of the grass cutting head of the present utility model.

FIG. 5 is a schematic view of the structure of the base and the wind shield of the grass-cutting head of the present utility model.

FIG. 6 is a schematic cross-sectional view of a base and a windshield of the grass cutting head of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

In this case, in order to avoid obscuring the present utility model due to unnecessary details, only the structures and/or processing steps closely related to the aspects of the present utility model are shown in the drawings, and other details not greatly related to the present utility model are omitted.

In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 to 6, the present utility model discloses a power tool, which may be a grass cutter, but may also be other types of power tools, and is not described in detail herein, nor is it limited thereto. For clarity of description, the following description will take a grass cutter as an example.

The grass trimmer comprises a grass trimming head 100, a connecting rod and a handle assembly, wherein a control assembly is arranged in the handle assembly, the control assembly comprises a PCB and can perform operation control on the grass trimmer, the connecting rod is used for connecting the grass trimming head 100 with the handle assembly, and the handle assembly and the grass trimming head 100 are respectively arranged at two ends of the connecting rod.

The handle assembly is also provided with a power supply, the power supply is provided with a power line penetrating through the connecting rod and connected with the grass cutting head 100, and the power supply is used for supplying power to the grass cutting head 100 and driving the grass cutting head 100 to operate. In a specific embodiment of the present utility model, the power source may be a peripheral power source, and may, of course, also be a battery pack.

As shown in fig. 1 and 2, the grass-cutting head 100 includes a housing 10 and a motor assembly 20, the housing 10 is used to connect with the connecting rod, and the motor assembly 20 is disposed in the housing 10. Specifically, a first cavity 101 is formed in the housing 10, the motor assembly 20 is disposed in the first cavity 101, a first air outlet 104 is formed at an opening of the first cavity 101, an extension 102 extending outwards is formed at the other side of the housing 10, the extension 102 is used for being connected with the connecting rod, and the extension 102 is provided with a first air inlet 103 communicated with the first cavity 101.

In particular, the interior of the connecting rod is communicated with the first air inlet 103, and the other end of the connecting rod is communicated with the handle assembly, so that the interior of the grass cutting head 100 is communicated with the interior of the handle assembly.

Further, the handle assembly is provided with a third air inlet, the first air inlet 103 is communicated with the third air inlet through the connecting rod, and the control assembly is arranged between the first air inlet 103 and the third air inlet.

The motor assembly 20 is formed with a heat dissipation channel, and the heat dissipation channel has a second air inlet 201 and a second air outlet 202, so that the third air inlet, the first air inlet 103, the second air inlet 201, the second air outlet 202 and the first air outlet 104 are sequentially communicated.

Preferably, the second air inlet 201 is provided with a first fan blade 21 for generating a flow through the heat dissipation channel, and the motor assembly 20 can drive the first fan blade 21 to rotate, and generate an air flow along the directions of the third air inlet, the first air inlet 103, the second air inlet 201, the second air outlet 202 and the first air outlet 104, so that the air flow sequentially passes through the control assembly and the motor assembly 20 for dissipating heat.

As shown in fig. 3, in particular, the motor assembly 20 includes a motor housing 22, a stator assembly 23, a rotor assembly 24, and an output shaft 25, and preferably, the stator assembly 23 is an electromagnetic coil, and the rotor assembly 24 is a magnet.

It should be noted that, the motor assembly 20 is an external rotor motor, that is, the rotor assembly 24 is disposed outside the stator assembly 23, the stator assembly 23 is disposed around the output shaft 25, the rotor assembly 24 is disposed around the stator assembly 23, and the rotor assembly 24 is fixedly disposed on the inner wall of the motor casing 22.

Meanwhile, the first fan blade 21 is connected with the rotor assembly 24 and the output shaft 25, the output shaft 25 is connected with the shaft center of the first fan blade 21, the rotor assembly 24 is fixedly connected with the outer periphery of the first fan blade 21, so that when the stator assembly 23 is electrified, the motor casing 22, the rotor assembly 24 and the first fan blade 21 synchronously rotate along with the output shaft 25, and then the first fan blade 21 can generate air flow flowing through the rotor assembly 24 and the stator assembly 23.

As a preferred embodiment of the present utility model, the opening of the first cavity 101, that is, the first air outlet 104 is provided with a base 11, the base 11 is fixedly connected with the housing 10, the output shaft 25 passes through the base 11 from the housing 10, that is, the base 11 surrounds the output shaft 25, a bearing is disposed between the base 11 and the output shaft 25, an outer ring of the bearing is fixedly connected with the base 11, and an inner ring of the bearing is fixedly connected with the output shaft 25.

As shown in fig. 4, a second fan blade 26 and a driving member 261 are further disposed along an axial direction of the output shaft 25, that is, an outer side of the base 11, the second fan blade 26 and the driving member 261 are coaxially disposed with the output shaft 25, an inner side of the driving member 261 is fixedly connected with the output shaft 25, and an outer side of the driving member 261 is in transmission connection with the second fan blade 26 and is used for driving the second fan blade 26 to rotate around the output shaft 25. The driving member 261 may be a gear, and the inner side of the second fan blade 26 may be a gear ring matched with the toothed structure, which is not particularly limited, so long as the driving member 261 and the second fan blade 26 can be sequentially driven by the output shaft 25 to perform transmission output.

It will be appreciated that, since the first fan blade 21 and the second fan blade 26 are both coaxially connected to the output shaft 25, the first fan blade 21 and the second fan blade 26 can rotate synchronously.

Since the first fan 21 is located at the second air inlet 201, the first fan 21 is preferably an axial flow type, so that the air flow generated by the first fan 21 flows along the axial direction of the output shaft 25.

As shown in fig. 4, since the second fan blade 26 is located outside the housing 10, the diameter of the second fan blade 26 is greater than that of the first fan blade 21, the second fan blade 26 is preferably centrifugal, a third air outlet 262 is disposed between the connected blades of the second fan blade 26, the blades of the second fan blade 26 are perpendicular to the plane of the base 11, and the opening direction of the third air outlet 262 is along the radial direction of the output shaft 25, so that the axial air flow generated by the first fan blade 21 along the output shaft 25 is discharged from the radial direction of the output shaft 25 instead. Namely: the air flowing out from the second air outlet 202 can flow out from the third air outlet 262 and the first air outlet 104 under the action of the second fan blade 26, so as to take away the heat of the stator assembly 23 and the rotor assembly 24.

As shown in fig. 2 and fig. 5 to fig. 6, as a preferred embodiment of the present utility model, a wind shielding member 30 is disposed between the motor assembly 20 and the first air inlet 103, the wind shielding member 30 is used for extending a path of the air flow from the first air inlet 103 to the first air outlet 104, and since the first fan blade 21 is an axial flow type, the first fan blade 21 generates a negative pressure with the second air inlet 201 when rotating, so that the air flow flowing in from the first air inlet 103 flows in towards the second air inlet 201.

The wind shielding member 30 is located in the housing 10, and the wind shielding member 30 is fixed on the base 11 and extends away from the base 11, i.e., the wind shielding member 30 extends in a direction from the first air outlet 104 to the top of the housing 10, so as to be opposite to the direction of the air flow in the heat dissipation path, the wind shielding member 30 extends in the housing 10, and a gap is provided between the wind shielding member 30 and the inner wall of the housing 10, and the gap is used for allowing the air flow from the first air inlet 103 to the second air inlet 201.

Further, a second cavity 31 is formed in the wind shielding member 30, which is equivalent to an accommodating space formed inside the wind shielding member 30, and an insert seat 32 is disposed in the second cavity 31, and the insert seat 32 is electrically connected with the motor assembly 20.

The base 11 is provided with a mounting opening for mounting the insert seat 32, the orthographic projection of the motor assembly 20 on the plane of the base 11 is not overlapped with the mounting opening, the wind shielding piece 30 is fixed on the mounting opening and is positioned on the inner side of the shell 10,

as shown in fig. 5, a baffle 33 for shielding the mounting opening is disposed on the other side of the mounting opening, and the baffle 33 prevents the air flow from the first air inlet 103 to the first air outlet 104 directly from the mounting opening by shielding the mounting opening. A wiring port 34 through which the power supply line passes is formed between the baffle 33 and the base 11, one end of the power supply line is connected with the insert seat 32, and the other end of the power supply line passes through the wiring port 34 to be connected with the motor assembly 20.

In the present utility model, the grass-cutting head 100 may be divided into a first part and a second part that are detachable from each other, wherein the first part includes the housing 10, the wind shielding member 30, and the blade holder 32 disposed in the wind shielding member 30, the wind shielding member 30 is fixed in the housing 10, the second part includes the base 11 and the motor assembly 20, and after the first part and the second part are fixed, the motor assembly 20 is electrically connected with the blade holder 32, so that the power supply assembly disposed in the handle assembly supplies power to the motor assembly 20. Of course, it will be appreciated that, at the time of disassembly, by separating the first portion and the second portion from each other so that the motor assembly 20 can be disassembled alone, the replacement efficiency can be improved by replacing the second portion alone, that is, by replacing the motor assembly 20 and the base 11.

In summary, the utility model solves the problems of difficult disassembly, time and labor consumption, more tools and easy damage to parts of the motor in the later stage, optimizes the air duct of the whole product by arranging the wind shield 30, ensures that the power of the whole product can be high, reduces the cost of the PCB, and solves the problem of failure of the whole product caused by unstable connection between the motor and the power line.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model.

Claims

1. A grass cutting head, comprising:

2. A grass cutting head as claimed in claim 1, wherein: the grass cutting head comprises a first part and a second part which are mutually detachable, the first part comprises a shell, a wind shielding piece and an inserting sheet seat arranged in the wind shielding piece, the wind shielding piece is fixed in the shell, the second part comprises a base and a motor assembly, and the motor assembly is electrically connected with the inserting sheet seat after the first part and the second part are fixedly arranged.

3. A grass cutting head as claimed in claim 2, wherein: the motor assembly is an outer rotor motor, the motor assembly comprises a stator assembly, a rotor assembly and an output shaft, the stator assembly surrounds the output shaft, the rotor assembly surrounds the stator assembly, and the first fan blade is connected with the rotor assembly and the output shaft so as to rotate synchronously along with the output shaft.

4. A grass cutting head as claimed in claim 3, wherein: the base is arranged at the opening of the first cavity and is fixedly connected with the shell, a bearing is arranged between the base and the output shaft, the outer ring of the bearing is fixedly connected with the base, and the inner ring of the bearing is fixedly connected with the output shaft.

5. A grass cutting head as claimed in claim 4, wherein: the wind shielding piece is connected with the base, a second cavity is formed in the wind shielding piece, the inserting piece seat is arranged in the second cavity, and the inserting piece seat is used for being electrically connected with the motor assembly.

6. A grass cutting head as claimed in claim 5, wherein: the plug-in sheet seat is characterized in that a mounting opening for mounting the plug-in sheet seat is formed in the base, the orthographic projection of the plane where the base is located is not overlapped with the mounting opening, a baffle for shielding the mounting opening is arranged at the mounting opening, and a wiring opening through which a power supply line penetrates out is formed between the baffle and the base.

7. A grass cutting head as claimed in claim 4, wherein: the outer side of the base is also provided with a second fan blade and a driving piece, the inner side of the driving piece is fixedly connected with the output shaft, and the outer side of the driving piece is in transmission connection with the second fan blade so as to drive the second fan blade to rotate around the output shaft.

8. A grass cutting head as claimed in claim 7, wherein: the first fan blade and the second fan blade rotate synchronously, and the diameter of the second fan blade is larger than that of the first fan blade.

9. A grass cutting head as claimed in claim 8, wherein: the first fan blade is an axial flow type, and the second fan blade is a centrifugal type.

10. The utility model provides a grass trimmer which characterized in that, including connecting rod and grass trimmer head, the grass trimmer head includes:

11. A lawnmower as claimed in claim 10 wherein: still include the handle subassembly, the handle subassembly is equipped with the third air intake, the inside of connecting rod switches on and connects the grass-mowing head with the handle subassembly, so that first air intake with the third air intake intercommunication.