Motor heat dissipation structure for coal mine and handheld electric tool

Abstract

The utility model relates to a coal mine motor heat dissipation structure and a hand-held electric tool, the coal mine motor heat dissipation structure comprises a housing, a decelerator module, a motor module and a fan, the housing is internally provided with an installation cavity, the decelerator module and the motor module are arranged in the installation cavity along a first direction, and the fan is arranged in the installation cavity along a second direction. The motor module is provided with an output shaft, the output shaft is in transmission connection with the speed reducer module, the fan is arranged between the speed reducer module and the motor module, the fan is fixedly connected with the output shaft, and the air outlet end of the fan is arranged opposite to the motor module. The heat dissipation structure of the motor for the coal mine can fully dissipate heat of the motor module, and is favorable for ensuring the working reliability of the motor module.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a motor heat dissipation structure for coal mines and a handheld electric tool. Background Art

[0002] Explosion-proof handheld power tools are mainly used in flammable and explosive environments such as coal mines to assist workers in bolt assembly, equipment installation and other operations to ensure the safety of personnel. Explosion-proof handheld power tools are tools with safety protection systems specially designed for hazardous environments. While improving the efficiency of workers' underground maintenance and installation operations, they can also effectively prevent the generation of sparks or static electricity, thereby avoiding the detonation of flammable gases or dust.

[0003] Among them, the driving motor of the explosion-proof handheld power tool needs to dissipate heat to reduce the temperature of the motor, but the motor heat dissipation structure design in the related art is unreasonable, resulting in poor heat dissipation effect of the motor. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the utility model proposes a heat dissipation structure for a motor used in a coal mine, which can fully dissipate the heat of the motor module, thereby ensuring the reliability of the operation of the motor module.

[0006] The embodiment of the utility model further provides a handheld electric tool.

[0007] The heat dissipation structure of a motor for coal mines in an embodiment of the utility model comprises: a shell, in which a mounting cavity is provided; a reducer module and a motor module, wherein the reducer module and the motor module are arranged in the mounting cavity along a first direction, and the motor module has an output shaft, and the output shaft is transmission-connected to the reducer module; a fan, wherein the fan is arranged between the reducer module and the motor module, and the fan is fixedly connected to the output shaft, and an air outlet end of the fan is arranged opposite to the motor module.

[0008] According to the heat dissipation structure of the motor for coal mines in the embodiment of the utility model, since the fan is arranged between the reducer module and the motor module, and the air outlet end of the fan is arranged opposite to the motor module, when the motor module drives the reducer module to rotate, it can also drive the fan to rotate to blow air to dissipate the heat of the motor module. Therefore, the heat dissipation structure of the motor for coal mines in the embodiment of the utility model can fully dissipate the heat of the motor module, which is beneficial to ensure the reliability of the operation of the motor module.

[0009] In some embodiments, the fan includes a connecting sleeve and a plurality of blades, the connecting sleeve being coaxially fixed on the output shaft, the plurality of blades being arranged on the fixed sleeve at circumferential intervals along the output shaft, the blades having a first end face and a second end face that are relatively arranged along their thickness direction, and the first end face and the second end face are both parallel to the axial direction of the output shaft.

[0010] In some embodiments, the fan includes a baffle, which is arranged on a side of the connecting sleeve facing away from the motor module. The baffle has a windshield surface at one end adjacent to the motor module, and at least one of the connecting sleeve and the blades is connected to the windshield surface.

[0011] In some embodiments, an air inlet and an air outlet are provided on the housing, the air inlet is arranged adjacent to the fan, and the air outlet is provided on a side of the motor module facing away from the fan.

[0012] In some embodiments, the outer shell includes a side shell and an end shell, the end shell is arranged at one end of the side shell along the first direction, and the side shell and the end shell form the installation cavity, the air outlet is arranged at the connection position between the side shell and the end shell, and the air inlet is arranged on the side shell.

[0013] In some embodiments, there are multiple air outlets, and the multiple air outlets are arranged at intervals along the circumference of the end shell; there are multiple air inlets, and the multiple air inlets are arranged at intervals along the circumference of the side shell.

[0014] In some embodiments, the heat dissipation structure of the motor for coal mine further includes a breathable dustproof sticker, which is arranged in the installation cavity and covers the air inlet and the air outlet.

[0015] In some embodiments, the installation cavity includes an air convection zone, and the air convection zone is arranged between the end surface of the motor module facing away from the fan and the end shell.

[0016] In some embodiments, a dimension of the air convection zone along the first direction is A, wherein 2 cm ≤ A ≤ 5 cm.

[0017] A handheld electric tool according to another embodiment of the utility model comprises the heat dissipation structure of the motor for coal mining described in any one of the embodiments of the utility model.

[0018] In the handheld power tool of the embodiment of the utility model, since the fan is arranged between the reducer module and the motor module, and the air outlet end of the fan is arranged opposite to the motor module, when the motor module drives the reducer module to rotate, it can also drive the fan to rotate to blow air to dissipate the heat of the motor module. Therefore, the handheld power tool of the embodiment of the utility model can fully dissipate the heat of the motor module, which is beneficial to ensuring the reliability of the operation of the motor module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a handheld electric tool according to an embodiment of the utility model.

[0020] Figure 2 It is a cross-sectional view of a handheld electric tool according to an embodiment of the utility model.

[0021] Figure 3 It is a partial schematic diagram of the handheld power tool according to an embodiment of the utility model with part of the housing removed.

[0022] Figure 4 It is an axial view of the heat dissipation structure of the motor for coal mines of the embodiment of the utility model with the outer shell removed.

[0023] Figure 5 It is a cross-sectional view of the heat dissipation structure of the motor for coal mines after removing the outer shell of the embodiment of the utility model.

[0024] Reference numerals:

[0025] 1. Shell; 11. Installation cavity; 111. Air convection area; 12. Side shell; 121. Air inlet; 13. End shell; 131. Air outlet;

[0026] 2. Reducer module;

[0027] 3. Motor module; 31. Output shaft; 32. Heat dissipation fins;

[0028] 4. Fan; 41. Connecting sleeve; 42. Blade; 421. First end surface; 422. Second end surface; 43. Baffle;

[0029] 5. Battery assembly;

[0030] 6. Fixture module. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0032] Please refer to the following Figures 1 to 5A motor heat dissipation structure and a handheld electric tool for coal mines according to an embodiment of the utility model are described.

[0033] like Figures 1 to 5 As shown, a heat dissipation structure of a motor for coal mines in an embodiment of the utility model comprises: a housing 1, a reducer module 2, a motor module 3 and a fan 4. An installation cavity 11 is provided in the housing 1, the reducer module 2 and the motor module 3 are arranged in the installation cavity 11 along a first direction, the motor module 3 has an output shaft 31, the output shaft 31 is transmission-connected to the reducer module 2, the fan 4 is arranged between the reducer module 2 and the motor module 3, and the fan 4 is fixedly connected to the output shaft 31, and the air outlet end of the fan 4 is arranged opposite to the motor module 3.

[0034] According to the heat dissipation structure of the motor for coal mines in the embodiment of the utility model, since the fan 4 is arranged between the reducer module 2 and the motor module 3, and the air outlet end of the fan 4 is arranged opposite to the motor module 3, when the motor module 3 drives the reducer module 2 to rotate, it can also drive the fan 4 to rotate to blow air to dissipate the heat of the motor module 3. Therefore, the heat dissipation structure of the motor for coal mines in the embodiment of the utility model can fully dissipate the heat of the motor module 3, which is beneficial to ensure the reliability of the operation of the motor module 3.

[0035] In the related art, the fan 4 is usually arranged at the rear end of the motor module 3, that is, the fan 4 is arranged at the end of the motor module 3 away from the reducer module 2. In the above scheme, the air outlet 131 is arranged at the end of the housing 1 adjacent to the fan 4. When the fan 4 rotates, the fan 4 can only dissipate heat to the rear of the motor module 3, and the heat dissipation effect is poor for the front end of the motor module 3 (that is, the end of the motor module 3 adjacent to the reducer). The heat dissipation structure of the motor for coal mines in the embodiment of the utility model can extend the flow path of the cooling airflow to improve the cooling effect of the motor module 3 by arranging the fan 4 between the reducer module 2 and the motor module 3, and the air outlet end of the fan 4 is arranged opposite to the motor module 3.

[0036] On the other hand, since the heat generated by the reducer module 2 or the clamp module 6 during operation is not large, there is no need to dissipate the heat. Therefore, the air outlet end of the fan 4 is arranged opposite to the motor module 3, which can concentrate the heat dissipation of the motor module 3 and further improve the heat dissipation effect of the motor module 3.

[0037] Alternatively, if Figures 1 to 3As shown, the housing 1 is provided with an air inlet 121 and an air outlet 131, the air inlet 121 is arranged adjacent to the fan 4, and the air outlet 131 is arranged on the side of the motor module 3 away from the fan 4. Since the fan 4 blows air toward the motor module 3, when the fan 4 rotates, the circulation rate of the airflow between the air inlet 121 and the air outlet 131 can be increased. That is, the external airflow can quickly pass through the air inlet 121 and enter the installation cavity 11, and then the airflow can move toward the direction of the motor module 3 and quickly flow out from the air outlet 131, thereby improving the heat dissipation effect of the motor module 3.

[0038] In some embodiments, Figures 3 to 5 As shown, the fan 4 includes a connecting sleeve 41 and a plurality of blades 42, the connecting sleeve 41 is coaxially fixed on the output shaft 31, and the plurality of blades 42 are arranged on the connecting sleeve 41 at intervals along the circumference of the output shaft 31, and the blade 42 has a first end face 421 and a second end face 422 arranged oppositely along its thickness direction, and the first end face 421 and the second end face 422 are both parallel to the axial direction of the output shaft 31. It can be understood that since the first end face 421 and the second end face 422 are both parallel to the axial direction of the output shaft 31, when the motor module 3 rotates forward or reversely, the fan 4 can blow air in the direction of the motor module 3, thereby improving the heat dissipation effect of the motor module 3.

[0039] Furthermore, if Figures 3 to 5 As shown, the fan 4 includes a baffle 43, which is arranged on the side of the connecting sleeve 41 away from the motor module 3, and a windshield surface is arranged at one end of the baffle 43 adjacent to the motor module 3, and at least one of the connecting sleeve 41 and the blade 42 is connected to the windshield surface. It can be understood that the baffle 43 can block the airflow flowing toward the reducer module 2, so that most of the airflow flows toward the motor module 3.

[0040] For example, the outer peripheral contour of the baffle plate 43 may be equal to the size of the outer peripheral contour formed by the plurality of blades 42 , or the outer peripheral contour of the baffle plate 43 may be slightly larger than the size of the outer peripheral contour formed by the plurality of blades 42 .

[0041] In some embodiments, Figure 2 and Figure 3As shown, the housing 1 includes a side shell 12 and an end shell 13, the end shell 13 is arranged at one end of the side shell 12 along the first direction, and the side shell 12 and the end shell 13 surround the installation cavity 11, the air outlet 131 is arranged at the connection position of the side shell 12 and the end shell 13, and the air inlet 121 is arranged on the side shell 12. It can be understood that when an operator uses an electric tool with the heat dissipation structure of the motor for coal mine, the face of the operator will be opposite to the end shell 13, so the heat dissipation structure of the motor for coal mine in the embodiment of the utility model sets the air outlet 131 at the connection position of the side shell 12 and the end shell 13, which can avoid the airflow from blowing directly on the face of the operator, and at the same time will not shorten the flow path of the cooling airflow in the installation cavity 11, and the use effect is better.

[0042] Specifically, Figure 1 As shown, there are multiple air outlets 131, which are arranged at intervals along the circumference of the end shell 13, and there are multiple air inlets 121, which are arranged at intervals along the circumference of the side shell 12, thereby improving the uniformity of heat dissipation of the motor module 3.

[0043] In one example, the heat dissipation structure of the motor for coal mining further includes a breathable dustproof sticker (not shown), which is arranged in the installation cavity 11 and covers the air inlet 121 and the air outlet 131. This can prevent external dust from entering the installation cavity 11, thereby improving the reliability of the power tool.

[0044] In some embodiments, Figure 2 and Figure 3 As shown, the installation cavity 11 includes an air convection area 111, and the air convection area 111 is arranged between the end surface of the motor module 3 on the side away from the fan 4 and the end shell 13. It can be understood that the end surface of the motor module 3 on the side away from the fan 4 is spaced apart from the end shell 13 along the first direction, and the air after cooling the motor module 3 can be discharged from the air outlet 131 after being buffered by the air convection area 111, thereby ensuring the comfort of hot air discharged after cooling the motor.

[0045] Alternatively, if Figure 2 and Figure 3 As shown, the dimension of the air convection zone 111 along the first direction is A, wherein 2cm≤A≤5cm. For example, the dimension A of the air convection zone 111 along the first direction may be 2cm, 3cm, 4cm, or 5cm. The inventors of the present application have found through experimental research that when the dimension of the air convection zone 111 along the first direction is less than 2cm, since the tail of the motor module 3 is close to the end shell 13, it is not conducive to heat dissipation of the tail of the motor module 3. When the dimension of the air convection zone 111 along the first direction is greater than 5cm, the flow efficiency of the air in the mounting cavity 11 will be greatly reduced, and the counterweight of the housing 1 will be increased, which is not conducive to the lightweight design of the power tool.

[0046] Furthermore, if Figure 3 and Figure 4 As shown, a plurality of heat dissipation fins 32 are provided on the outer periphery of the motor module 3 , the heat dissipation fins 32 extend along a first direction, and the plurality of heat dissipation fins 32 are arranged at intervals along the circumference of the motor module 3 , thereby further improving the heat dissipation effect of the motor module 3 .

[0047] like Figure 1 As shown, another embodiment of the handheld power tool of the utility model includes the motor heat dissipation structure for coal mines of the utility model. Specifically, the handheld power tool also includes a battery assembly 5, which is arranged at the lower end of the housing 1 and is electrically connected to the motor module 3.

[0048] For example, the handheld power tool may be a hand drill, an impact drill or a handheld saw. A clamp module 6 is provided at one end of the reducer module 2 away from the motor module 3, and the clamp module 6 is used to clamp tools such as a screwdriver bit, a drill bit and a saw blade. The reducer module 2 and the clamp module 6 may be an integral structure and be clamped with the housing 1.

[0049] The handheld electric tool of the embodiment of the utility model can fully dissipate the heat of the motor module 3, which is beneficial to ensure the working reliability of the motor module 3.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A heat dissipation structure for a motor used in a coal mine, characterized in that: include: A housing, wherein a mounting cavity is provided in the housing; A reducer module and a motor module, wherein the reducer module and the motor module are arranged in the installation cavity along a first direction, and the motor module has an output shaft, and the output shaft is drivingly connected to the reducer module; A fan is provided between the reducer module and the motor module, and the fan is fixedly connected to the output shaft, and an air outlet end of the fan is arranged opposite to the motor module.

2. The heat dissipation structure of the motor for coal mine according to claim 1, characterized in that: The fan includes a connecting sleeve and a plurality of blades, wherein the connecting sleeve is coaxially fixed on the output shaft, and the plurality of blades are arranged on the connecting sleeve at intervals along the circumference of the output shaft, and the blades have a first end face and a second end face that are arranged oppositely along the thickness direction thereof, and the first end face and the second end face are both parallel to the axial direction of the output shaft.

3. The heat dissipation structure of the motor for coal mine according to claim 2, characterized in that: The fan comprises a baffle, which is arranged on a side of the connecting sleeve away from the motor module. An end of the baffle adjacent to the motor module is provided with a windshield surface, and at least one of the connecting sleeve and the blades is connected to the windshield surface.

4. The heat dissipation structure of a motor for coal mine according to claim 1, characterized in that: The housing is provided with an air inlet and an air outlet, the air inlet is arranged adjacent to the fan, and the air outlet is arranged on a side of the motor module away from the fan.

5. The heat dissipation structure of the motor for coal mine according to claim 4, characterized in that: The outer shell includes a side shell and an end shell, the end shell is arranged at one end of the side shell along the first direction, and the side shell and the end shell surround the installation cavity, the air outlet is arranged at the connection position of the side shell and the end shell, and the air inlet is arranged on the side shell.

6. The heat dissipation structure of the motor for coal mine according to claim 5, characterized in that: There are a plurality of air outlets, which are arranged at intervals along the circumference of the end shell; there are a plurality of air inlets, which are arranged at intervals along the circumference of the side shell.

7. The heat dissipation structure of the motor for coal mine according to claim 5, characterized in that: The heat dissipation structure of the motor for coal mine also includes a breathable dustproof sticker, which is arranged in the installation cavity and covers the air inlet and the air outlet.

8. The heat dissipation structure of a motor for coal mine according to claim 5, characterized in that: The installation cavity comprises an air convection zone, and the air convection zone is arranged between the end surface of the motor module facing away from the fan and the end shell.

9. The heat dissipation structure of a motor for coal mine according to claim 8, characterized in that: The size of the air convection zone along the first direction is A, wherein 2cm≤A≤5cm.

10. A handheld electric tool, characterized in that: The invention comprises the heat dissipation structure of a motor for coal mine as described in any one of claims 1 to 9.

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