Grass trimming head and grass trimmer

Abstract

The invention provides a grass mowing head and a grass mowing machine. The grass mowing head comprises a shell, a first cavity is formed in the shell, a first air outlet is formed in an opening of the first cavity, the shell is provided with an extending part extending outwards, and the extending part is provided with a first air inlet communicated with the first cavity; the motor assembly is arranged in the first cavity, a heat dissipation channel is formed in the motor assembly, the heat dissipation channel is provided with a second air inlet and a second air outlet, and the second air inlet is provided with first fan blades used for generating air flowing through the heat dissipation channel; the air blocking piece is arranged between the motor assembly and the first air inlet, and the air blocking piece extends in the direction from the first air outlet to the top of the shell so as to be opposite to the direction of airflow in the heat dissipation channel, so that the path of the airflow directly flowing from the first air inlet to the first air outlet is prolonged. The air duct structure is optimized by arranging the air blocking piece, and the heat dissipation efficiency can be greatly improved.

Description

Technical Field

[0001] The invention relates to a grass trimmer head and a grass trimmer, belonging to the technical field of electric tools. Background Art

[0002] At present, the existing lawn mowers are not designed with the maintenance and disassembly of the motor in mind, which results in cumbersome disassembly steps and the need to use many tools. Parts may also be damaged during disassembly, resulting in high maintenance costs. In addition, when working, the lawn mower can only dissipate heat for the mowing head, but not for the PCB board at the same time.

[0003] In view of this, it is necessary to provide a grass trimmer head and a grass trimmer to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a grass trimmer head and a grass trimmer, which can improve the disassembly and assembly efficiency and enhance the heat dissipation capacity.

[0005] To achieve the above object, the present invention provides a grass trimmer head, comprising:

[0006] A shell, wherein a first cavity is formed in the shell, a first air outlet is provided at an opening of the first cavity, the shell has an extension portion extending outward, and the extension portion has a first air inlet communicated with the first cavity;

[0007] A motor assembly, wherein the motor assembly is arranged in the first cavity and has a heat dissipation channel, the heat dissipation channel has a second air inlet and a second air outlet, and a first fan blade is arranged at the second air inlet for generating air flowing through the heat dissipation channel;

[0008] A wind shield is disposed between the motor assembly and the first air inlet, and extends in a direction from the first air outlet to the top of the shell so as to be opposite to the airflow direction in the heat dissipation channel so as to extend the path of the airflow flowing directly from the first air inlet to the first air outlet.

[0009] As a further improvement of the present invention, the grass trimmer head includes a first part and a second part that are detachable from each other, the first part includes the shell, the wind shield and a blade seat arranged in the wind shield, the wind shield is fixed in the shell, and the second part includes a base and the motor assembly, and after the first part and the second part are installed and fixed, the motor assembly is electrically connected to the blade seat.

[0010] As a further improvement of the present invention, the motor assembly is an external rotor motor, which includes 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 to the rotor assembly and the output shaft to rotate synchronously with the output shaft.

[0011] As a further improvement of the present invention, the base is arranged at the opening of the first cavity, the base is fixedly connected to the shell, a bearing is provided between the base and the output shaft, the outer ring of the bearing is fixedly connected to the base, and the inner ring of the bearing is fixedly connected to the output shaft.

[0012] As a further improvement of the present invention, the wind shield is connected to the base, a second cavity is formed in the wind shield, the plug seat is arranged in the second cavity, and the plug seat is used to be electrically connected to the motor assembly.

[0013] As a further improvement of the present invention, a mounting opening for installing the plug socket is provided on the base, the orthographic projection of the motor assembly on the plane where the base is located does not overlap with the mounting opening, a baffle for covering the mounting opening is provided at the mounting opening, and a wiring opening for the power supply line to pass through is formed between the baffle and the base.

[0014] As a further improvement of the present invention, a second fan blade and a driving member are also provided on the outer side of the base, the inner side of the driving member is fixedly connected to the output shaft, and the outer side of the driving member is transmission connected to the second fan blade to drive the second fan blade to rotate around the output shaft.

[0015] As a further improvement of the present invention, the first fan blade and the second fan blade rotate synchronously and the diameter of the second fan blade is greater than the diameter of the first fan blade.

[0016] As a further improvement of the present invention, the first fan blades are of axial flow type, and the second fan blades are of centrifugal type.

[0017] To achieve the above object, the present invention further provides a grass trimmer, comprising a connecting rod and a grass trimmer head, wherein the grass trimmer head comprises:

[0018] A shell, wherein a first cavity is formed in the shell, a first air outlet is provided at an opening of the first cavity, the shell has an extension portion extending outward, and the extension portion has a first air inlet communicated with the first cavity;

[0019] A motor assembly, wherein the motor assembly is arranged in the first cavity and has a heat dissipation channel, the heat dissipation channel has a second air inlet and a second air outlet, and a first fan blade is arranged at the second air inlet for generating air flowing through the heat dissipation channel;

[0020] A wind shield is disposed between the motor assembly and the first air inlet, and extends in a direction from the first air outlet to the top of the shell so as to be opposite to the airflow direction in the heat dissipation channel so as to extend the path of the airflow flowing directly from the first air inlet to the first air outlet.

[0021] As a further improvement of the present invention, it also includes a handle assembly, the handle assembly is provided with a third air inlet, the interior of the connecting rod is conductive and connects the grass trimmer head and the handle assembly, so that the first air inlet is connected to the third air inlet.

[0022] The beneficial effects of the present invention are as follows: the present invention optimizes the air duct structure by arranging a wind shield between the motor assembly and the first air inlet, and sets the extension direction of the wind shield to be opposite to the air flow direction in the heat dissipation channel, thereby extending the path of the air flow directly from the first air inlet to the first air outlet, thereby greatly improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the grass trimming head of the present invention.

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the grass trimmer head of the present invention.

[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of the grass trimmer head of the present invention without the shell.

[0026] Figure 4 This is a schematic diagram of the partially exploded structure of the grass trimmer head of the present invention.

[0027] Figure 5 This is a schematic structural diagram of the base and wind shield of the grass trimmer head of the present invention.

[0028] Figure 6 It is a schematic cross-sectional structure diagram of the base and wind shield of the grass trimmer head of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] It should be noted here that in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the scheme of the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0031] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0032] like Figures 1 to 6 As shown, the present invention discloses an electric tool, which can be a lawn mower, or other types of electric tools, which will not be described in detail or limited in any way. For the sake of clarity, the following description will be described in detail using a lawn mower as an example.

[0033] The grass trimmer includes a grass trimmer head 100, a connecting rod and a handle assembly. The handle assembly is provided with a control assembly. The control assembly includes a PCB board and can operate and control the grass trimmer. The connecting rod is used to connect the grass trimmer head 100 and the handle assembly, and the handle assembly and the grass trimmer head 100 are respectively arranged at both ends of the connecting rod.

[0034] The handle assembly is also provided with a power source, which is provided with a power cord passing through the connecting rod and connected to the grass trimming head 100, and the power source is used to power the grass trimming head 100 and drive the grass trimming head 100 to operate. In a specific embodiment of the present invention, the power source can be an external power source, and of course, it can also be a battery pack.

[0035] like Figure 1 and Figure 2 As shown, the grass trimmer head 100 includes a housing 10 and a motor assembly 20, wherein the housing 10 is used to be connected to 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, and the motor assembly 20 is disposed in the first cavity 101. The opening of the first cavity 101 has a first air outlet 104, and the other side of the housing 10 has an outwardly extending extension portion 102, wherein the extension portion 102 is used to be connected to the connecting rod, and the extension portion 102 has a first air inlet 103 communicating with the first cavity 101.

[0036] In particular, the interior of the connecting rod is conductive and connected to the first air inlet 103, and the other end of the connecting rod is connected to the handle assembly. Such an arrangement is equivalent to the interior of the mowing head 100 being connected to the interior of the handle assembly.

[0037] Furthermore, the handle assembly is provided with a third air inlet, the first air inlet 103 and the third air inlet are connected via the connecting rod, and the control assembly is arranged between the first air inlet 103 and the third air inlet.

[0038] A heat dissipation channel is formed in the motor assembly 20, 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 connected in sequence.

[0039] Preferably, the second air inlet 201 is provided with a first fan blade 21 for generating air flowing through the heat dissipation channel, and the motor assembly 20 can drive the first fan blade 21 to rotate and generate airflow along the direction 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 airflow passes through the control assembly and the motor assembly 20 in sequence for heat dissipation.

[0040] Combination Figure 3 As shown, specifically, the motor assembly 20 includes a motor housing 22, a stator assembly 23, a rotor assembly 24 and an output shaft 25. Preferably, the stator assembly 23 is an electromagnetic coil, and the rotor assembly 24 is a magnet.

[0041] It should be noted that the motor assembly 20 is an outer rotor motor, that is, the rotor assembly 24 is arranged on the outside of the stator assembly 23, the stator assembly 23 is arranged around the output shaft 25, the rotor assembly 24 is arranged around the stator assembly 23, and the rotor assembly 24 is fixedly arranged on the inner wall of the motor housing 22.

[0042] At the same time, the first fan blade 21 is connected to the rotor assembly 24 and the output shaft 25, the output shaft 25 is connected to the axis of the first fan blade 21, and the rotor assembly 24 is fixedly connected to the outer periphery of the first fan blade 21, so that when the stator assembly 23 is energized, the motor housing 22, the rotor assembly 24 and the first fan blade 21 rotate synchronously with the output shaft 25, and then the first fan blade 21 can generate an airflow flowing through the rotor assembly 24 and the stator assembly 23.

[0043] As a preferred embodiment of the present invention, a base 11 is provided at the opening of the first cavity 101, that is, the first air outlet 104, and the base 11 is fixedly connected to the shell 10. The output shaft 25 passes through the base 11 from the shell 10, that is, the base 11 surrounds the output shaft 25. A bearing is provided between the base 11 and the output shaft 25, and the outer ring of the bearing is fixedly connected to the base 11, and the inner ring of the bearing is fixedly connected to the output shaft 25.

[0044] Combination Figure 4 As shown, along the axial direction outward of the output shaft 25, that is, the outer side of the base 11 is further provided with a second blade 26 and a driving member 261, the second blade 26 and the driving member 261 are coaxially arranged with the output shaft 25, the inner side of the driving member 261 is fixedly connected with the output shaft 25, and the outer side of the driving member 261 is transmission-connected with the second blade 26 and is used to drive the second blade 26 to rotate around the output shaft 25. The driving member 261 can be a gear, and the inner side of the second blade 26 can be a gear ring matched with a toothed structure, and there is no specific limitation, as long as the driving member 261 and the second blade 26 can be driven in sequence by the output shaft 25 to transmit the output.

[0045] It can be understood that, since the first blade 21 and the second blade 26 are both coaxially connected to the output shaft 25, the first blade 21 and the second blade 26 can rotate synchronously.

[0046] Since the first fan blade 21 is located at the second air inlet 201 , the first fan blade 21 is preferably axial flow type, so that the airflow generated by the first fan blade 21 flows along the axial direction of the output shaft 25 .

[0047] Combination Figure 4 As shown, since the second blade 26 is located outside the housing 10, the diameter of the second blade 26 is greater than the diameter of the first blade 21, the second blade 26 is preferably centrifugal, and a third air outlet 262 is provided between the connected blades of the second blade 26, the blades of the second blade 26 are perpendicular to the plane where the base 11 is located, and the opening direction of the third air outlet 262 is radially outward along the output shaft 25, so that the axial airflow along the output shaft 25 generated by the first blade 21 is changed to be discharged radially outward from the output shaft 25. That is: the airflow flowing out of 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 blade 26 to take away the heat of the stator assembly 23 and the rotor assembly 24.

[0048] Combination Figure 2 , Figure 5 to Figure 6As shown, as a preferred embodiment of the present invention, a wind shield 30 is provided between the motor assembly 20 and the first air inlet 103, and the wind shield 30 is used to extend the path of the airflow from the first air inlet 103 directly to the first air outlet 104. Since the first fan blade 21 is axial flow type, the first fan blade 21 generates negative pressure with the second air inlet 201 when rotating, so that the airflow flowing in from the first air inlet 103 flows toward the second air inlet 201.

[0049] The wind shield 30 is located in the shell 10, and the wind shield 30 is fixed on the base 11 and extends in the direction away from the base 11, that is, the wind shield 30 extends in the direction from the first air outlet 104 to the top of the shell 10, so as to be opposite to the air flow direction in the heat dissipation channel. The wind shield 30 extends in the shell 10, and there is a gap between the wind shield 30 and the inner wall of the shell 10, and the gap is for air flow to flow from the first air inlet 103 to the second air inlet 201.

[0050] Furthermore, a second cavity 31 is formed in the wind shield 30 , which is equivalent to a receiving space formed inside the wind shield 30 . A plug-in seat 32 is provided in the second cavity 31 , and the plug-in seat 32 is used to be electrically connected to the motor assembly 20 .

[0051] The base 11 is provided with an installation opening for installing the insert seat 32, the orthographic projection of the motor assembly 20 on the plane where the base 11 is located does not overlap with the installation opening, and the wind shield 30 is fixed at the installation opening and located on the inner side of the housing 10.

[0052] like Figure 5 As shown, a baffle 33 for shielding the mounting opening is provided on the other side of the mounting opening, and the baffle 33 shields the mounting opening to prevent airflow from the first air inlet 103 directly flowing from the mounting opening to the first air outlet 104. A wiring opening 34 for the power supply line to pass through is formed between the baffle 33 and the base 11, and one end of the wire is connected to the plug seat 32, and the other end passes through the wiring opening 34 to connect to the motor assembly 20.

[0053] It should be noted that, in the present invention, the grass trimmer head 100 can be divided into a first part and a second part that can be detached from each other, wherein the first part includes the housing 10, the windshield 30 and a blade seat 32 provided in the windshield 30, the windshield 30 is fixed in the housing 10, and the second part includes a base 11 and the motor assembly 20. After the first part and the second part are installed and fixed, the motor assembly 20 is electrically connected to the blade seat 32 so that the power supply assembly provided in the handle assembly supplies power to the motor assembly 20. Of course, it can be understood that, during disassembly, by separating the first part and the second part from each other so that the motor assembly 20 can be disassembled separately, and by replacing the second part separately, that is, replacing the motor assembly 20 and the base 11, the replacement efficiency can be improved.

[0054] In summary, the present invention solves the problems of difficulty in later motor disassembly, time-consuming and labor-intensive, requiring many tools, and easy damage to parts. By providing the wind shield 30, the air duct of the whole product is optimized, so that the power of the whole machine can be increased and the cost of PCB boards can be reduced, and the problem of failure of the whole machine due to loose connection between the motor and the power cord is solved.

[0055] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A grass trimmer head, characterized in that: include: A shell, wherein a first cavity is formed in the shell, a first air outlet is provided at an opening of the first cavity, the shell has an extension portion extending outward, and the extension portion has a first air inlet communicated with the first cavity; A motor assembly, wherein the motor assembly is arranged in the first cavity and has a heat dissipation channel, the heat dissipation channel has a second air inlet and a second air outlet, and a first fan blade is arranged at the second air inlet for generating air flowing through the heat dissipation channel; A wind shield is disposed between the motor assembly and the first air inlet, and extends in a direction from the first air outlet to the top of the shell so as to be opposite to the airflow direction in the heat dissipation channel so as to extend the path of the airflow flowing directly from the first air inlet to the first air outlet.

2. The grass trimmer head according to claim 1, characterized in that: The grass trimmer head includes a first part and a second part that are detachable from each other, the first part includes the shell, the wind shield and a blade seat arranged in the wind shield, the wind shield is fixed in the shell, and the second part includes a base and the motor assembly. After the first part and the second part are installed and fixed, the motor assembly is electrically connected to the blade seat.

3. The grass trimmer head according to claim 2, characterized in that: The motor assembly is an outer rotor motor, which includes a stator assembly, a rotor assembly and an output shaft. The stator assembly is arranged around the output shaft, and the rotor assembly is arranged around the stator assembly. The first fan blade is connected to the rotor assembly and the output shaft to rotate synchronously with the output shaft.

4. The grass trimmer head according to claim 3, characterized in that: The base is arranged at the opening of the first cavity, the base is fixedly connected to the shell, a bearing is arranged between the base and the output shaft, the outer ring of the bearing is fixedly connected to the base, and the inner ring of the bearing is fixedly connected to the output shaft.

5. The grass trimmer head according to claim 4, characterized in that: The wind shield is connected to the base, a second cavity is formed in the wind shield, the plug-in seat is arranged in the second cavity, and the plug-in seat is used to be electrically connected to the motor assembly.

6. The grass trimmer head according to claim 5, characterized in that: The base is provided with an installation opening for installing the plug socket, the orthographic projection of the motor assembly on the plane where the base is located does not overlap with the installation opening, a baffle is provided at the installation opening to cover the installation opening, and a wiring opening for the power supply line to pass through is formed between the baffle and the base.

7. The grass trimmer head according to claim 4, characterized in that: The outer side of the base is also provided with a second fan blade and a driving member, the inner side of the driving member is fixedly connected to the output shaft, and the outer side of the driving member is transmission-connected to the second fan blade to drive the second fan blade to rotate around the output shaft.

8. The grass trimmer head according to claim 7, characterized in that: The first fan blade and the second fan blade rotate synchronously and the diameter of the second fan blade is greater than the diameter of the first fan blade.

9. The grass trimmer head according to claim 8, characterized in that: The first fan blades are of axial flow type, and the second fan blades are of centrifugal type.

10. A grass trimmer, characterized in that: It comprises a connecting rod and a mowing head, and the mowing head comprises: A shell, wherein a first cavity is formed in the shell, a first air outlet is provided at an opening of the first cavity, the shell has an extension portion extending outward, and the extension portion has a first air inlet communicated with the first cavity; A motor assembly, wherein the motor assembly is arranged in the first cavity and has a heat dissipation channel, the heat dissipation channel has a second air inlet and a second air outlet, and a first fan blade is arranged at the second air inlet for generating air flowing through the heat dissipation channel; A wind shield is disposed between the motor assembly and the first air inlet, and extends in a direction from the first air outlet to the top of the shell so as to be opposite to the airflow direction in the heat dissipation channel so as to extend the path of the airflow flowing directly from the first air inlet to the first air outlet.

11. The grass trimmer according to claim 10, characterized in that: It also includes a handle assembly, which is provided with a third air inlet. The interior of the connecting rod is conductive and connects the grass trimmer head and the handle assembly, so that the first air inlet is connected to the third air inlet.

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