Electric tool

Abstract

The utility model discloses an electric tool. The electric tool comprises a tool body; the at least one motor is arranged in the tool main body; the motor includes: a housing; the stator and the rotor are arranged in the shell; cooling liquid is further arranged in the shell and makes contact with the rotor. The motor further comprises a rotation stopping assembly arranged in the shell, and the rotation stopping assembly at least comprises a stopping part for stopping the cooling liquid from rotating. According to the technical scheme, the motor and the electric tool which are good in heat dissipation performance can be provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tools, in particular to an electric tool. BACKGROUND

[0002] Electric tools are more environmentally friendly than engine tools, and thus are widely used. Electric tools generally use motors to drive work. When the electric tool is working, the motor generates heat. The greater the working current of the electric tool, the more heat the motor generates, and the more serious the heating of the motor winding. When the winding temperature is high, it will cause problems such as motor efficiency decline and insufficient output, so that the motor and the electric tool cannot work normally.

[0003] This part provides background information related to the present application, which may not be prior art. CONTENT OF THE UTILITY MODEL

[0004] An object of the present application is to solve or at least alleviate part or all of the above problems. To this end, an object of the present application is to provide an electric tool with good heat dissipation performance.

[0005] In order to achieve the above object, the present application adopts the following technical solution:

[0006] An electric tool, comprising: a tool body; at least one motor arranged in the tool body; the motor comprising: a shell; a stator and a rotor arranged in the shell; the shell of the at least one motor further comprising a cooling liquid, the cooling liquid being in contact with the stator or the rotor; the motor further comprising: a rotation blocking assembly arranged in the shell, the rotation blocking assembly comprising at least a blocking portion for blocking rotation of the cooling liquid.

[0007] In some embodiments, the inner side of the shell is protruded inward to form a plurality of blocking portions.

[0008] In some embodiments, the rotation blocking assembly is detachably mounted to the inner side of the shell.

[0009] In some embodiments, the rotation blocking assembly is fixedly mounted to the inner side of the shell.

[0010] In some embodiments, the extension direction of the blocking portion in the shell is substantially parallel to the output shaft of the motor.

[0011] In some embodiments, the rotation blocking assembly comprises a fixing portion, and the rotation blocking assembly is fixedly mounted to the inner side of the shell based on the fixing portion.

[0012] In some embodiments, the motor further comprises a pump structure arranged to be driven by the motor to pump the cooling liquid from a first end of the motor to a second end of the motor.

[0013] In some embodiments, the motor further comprises a collecting assembly arranged to collect the cooling liquid to the second end of the motor.

[0014] In some embodiments, the motor further comprises a spraying assembly fixed on the retainer of the motor, receiving the cooling liquid from the collecting assembly; wherein the spraying assembly comprises at least one spraying hole to spray the cooling liquid to the motor.

[0015] In some embodiments, the power of the motor is greater than or equal to 2kW and less than or equal to 10kW.

[0016] In some embodiments, the rotating speed of the motor is greater than or equal to 2000RPM and less than or equal to 7000RPM.

[0017] The present application has the advantages that: by arranging the cooling liquid in the motor housing, the cooling liquid transfers the heat generated by the motor to the housing, and the housing can quickly dissipate the heat of the motor to the external environment. And the anti-swirl assembly is arranged to ensure the contact surface of the cooling liquid with the housing and the motor, which improves the heat dissipation capacity of the motor, and the heat dissipation performance of the electric tool is better. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective view of an electric tool of an embodiment;

[0019] Figure 2 is a perspective view of a motor of an embodiment;

[0020] Figure 3 is a perspective view of a motor of an embodiment comprising an anti-swirl assembly;

[0021] Figure 4 is Figure 3 is a top view of the motor in

[0022] Figure 5 is a perspective view of a motor of an embodiment comprising an anti-swirl assembly formed by a protrusion;

[0023] Figure 6 is a perspective view of a motor of an embodiment comprising a fixing part of an anti-swirl assembly;

[0024] Figure 7 is a perspective view of a motor of an embodiment comprising a groove;

[0025] Figure 8 is a perspective view of a motor of an embodiment comprising a pump structure;

[0026] Figure 9 is Figure 8 is a side view of the motor comprising a pump structure in

[0027] Figure 10 is Figure 8a cross-sectional view of the motor including the collection assembly and the spray assembly;

[0028] Figure 11 is Figure 8 a top view of the motor including the spray assembly;

[0029] Figure 12 is a perspective view of the motor including the second guide of an embodiment;

[0030] Figure 13 is a perspective view of the motor including the first guide of an embodiment. DETAILED DESCRIPTION

[0031] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings. It is being understood that the terminology used herein is for purpose of description and not of limitation.

[0032] In the present application, the terms "comprising", "containing", "including", "having" or any other similar term are intended to encompass non-exclusive inclusion, such that processes, methods, articles or apparatuses that comprise a list of elements are not limited to those elements, but can also include other elements not expressly listed or inherent to such processes, methods, articles or apparatuses. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0033] In the present application, the term "and / or", is a description of the associated relationship between objects, which means that there can be three kinds of relationships. For example, A and / or B, can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents a "and / or" relationship between the front and rear associated objects.

[0034] In the present application, the terms "connection", "combination", "coupling", "mounting" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, for example, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0035] In this application, those of ordinary skill in the art will understand that relative terms (e.g., "about", "approximately", "substantially", etc.) used in connection with a quantity or a condition (e.g., "about 10" or "substantially parallel") are intended to include the stated value and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with a particular measurement of the particular value and tolerances that are expected to result from manufacturing, assembling, using, etc. of the particular value. Such terms are also to be construed to disclose a range defined by the absolute values of the two endpoints. The relative terms can refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Values that do not employ relative terms are also to be disclosed as particular values with tolerances. In addition, "substantially" when used in the context of expressing a relative angular positional relationship (e.g., substantially parallel, substantially perpendicular) can refer to plus or minus a certain number of degrees (e.g., 1 degree, 5 degrees, 10 degrees or more) from the indicated angle.

[0036] In this application, those of ordinary skill in the art will understand that a function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, a function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0037] In this application, the terms "upper", "lower", "left", "right", "front", "back", and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it is also understood in the context that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the directly below, left below, right below, front below, and back below, etc.

[0038] The electric power tools to which the technical solutions of the present application are applicable include outdoor walking devices, handheld electric power tools, fastening type electric power tools, cutting type electric power tools, polishing type electric power tools, etc. For example, riding lawn mowers, blowers, electric drills, electric circular saws, reciprocating saws, impact wrenches, impact screwdrivers, hammer drills, and other types of electric power tools can fall within the protection scope of the present application as long as they can adopt the essential content of the technical solutions disclosed herein.

[0039] As Figure 1As shown, the power tool disclosed in this application is an outdoor walking device 100, which is a ride-on lawnmower that allows users to sit or stand on it to operate for mowing lawns and other vegetation. The outdoor walking device 100 includes: a housing assembly, an energy storage device, a walking assembly, and a frame. The frame extends substantially in a front-to-back direction and, together with the housing assembly, constitutes the main body of the outdoor walking device. The energy storage device provides energy to the mowing assembly and the walking assembly, enabling the outdoor walking device to be used as a power tool.

[0040] The walking assembly includes a set of walking wheels and a walking motor. The walking wheels are connected to the main unit to support it. The walking wheels can drive the outdoor walking device to move in at least the forward and backward direction. The walking assembly includes a rear walking wheel and a front walking wheel. The walking motor drives the rear walking wheel or the front walking wheel to rotate, enabling the outdoor walking device 100 to move on the ground. The outdoor walking device 100 also includes functional components for realizing tool functions and a drive motor for driving the functional components. In this embodiment, the outdoor walking device 100 is a ride-on lawnmower, and the functional component is specifically a lawnmower assembly, which includes a mowing element for cutting lawn grass, and the drive motor drives the mowing element to rotate. The structure and position of the above-mentioned mowing component and drive motor are conventional settings in the art, and will not be described in detail in this application. The outdoor walking device 100 is internally equipped with a motor 200 (not shown in the figure), which can be either a walking motor or a drive motor, or a combination of both. The motor 200 can be either an internal rotor motor or an external rotor motor, and this application does not limit this.

[0041] This application uses motor 200 as an example of an external rotor motor for specific explanation. Figure 2 As shown, the motor 200 includes a housing 210, an output shaft 220, a stator 230, and a rotor 240. An installation space is formed within the housing 210. Both the stator 230 and the rotor 240 are installed within this space, with the stator 230 located inside the rotor 240. The output shaft 220 is located within the installation space, and its output end protrudes from both the stator 230 and the rotor 240. The stator 230 is a fixed component inside the housing 210, and its main function is to generate a rotating magnetic field. The rotor 240 is capable of rotation, and its main function is to be cut by magnetic lines of force in the rotating magnetic field, thereby generating an electric current. For ease of description, the following definitions are used: Figure 2 As shown: top and bottom.

[0042] A coolant 300 can be installed inside the housing 210. The heat generated when the motor 200 operates can be conducted to the housing 210 through the coolant 300. The coolant 300 is in contact with both the housing 210 and the stator 230 or rotor 240. Specifically, when the motor 200 operates, the heat generated on the motor 200 windings is transferred through the stator 230 or rotor 240 to the coolant 300, and then to the housing 210. Figure 2 As shown, in this application, the coolant 300 is specifically in contact with the housing 210 and the rotor 240. The coolant 300 transfers the heat generated by the motor 200 windings to the housing 210, avoiding the low efficiency of heat transfer via air and the difficulty in quickly dissipating heat during prolonged motor operation. Therefore, the housing 210 can quickly dissipate the heat generated by the motor 200 windings to the external environment, improving the heat dissipation capacity of the motor 200 and resulting in better heat dissipation performance of the outdoor walking device 100.

[0043] In some embodiments, the power of the motor 200 is greater than or equal to 2kW and less than or equal to 10kW. Optionally, the power of the motor 200 is 3.5kW. Optionally, the power of the motor 200 is 5kW. The power of the motor 200 is 6.5kW. The power of the motor 200 is 8kW.

[0044] In some embodiments, the rotational speed of motor 200 is greater than or equal to 2000 RPM and less than or equal to 7000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 2000 RPM and less than or equal to 6000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 2000 RPM and less than or equal to 5000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 3000 RPM and less than or equal to 7000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 3000 RPM and less than or equal to 6000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 3000 RPM and less than or equal to 5000 RPM. In some embodiments, the rotational speed of motor 200 is greater than or equal to 4000 RPM and less than or equal to 7000 RPM.

[0045] Optionally, the speed of motor 200 is 2400 RPM. Optionally, the speed of motor 200 is 3000 RPM.

[0046] Optionally, the speed of motor 200 is 3500 RPM. Optionally, the speed of motor 200 is 4000 RPM.

[0047] Optionally, the speed of motor 200 is 4600 RPM. Optionally, the speed of motor 200 is 5000 RPM.

[0048] Optionally, the rotation speed of the motor 200 is 5800 RPM. Optionally, the rotation speed of the motor 200 is 6300 RPM.

[0049] In some embodiments, the thermal conductivity of the cooling liquid 300 is greater than or equal to 0.1 W / (m·K) and less than or equal to 0.5 W / (m·K). Optionally, the thermal conductivity of the cooling liquid 300 is 0.2 W / (m·K). Optionally, the thermal conductivity of the cooling liquid 300 is 0.3 W / (m·K).

[0050] In some embodiments, the viscosity of the cooling liquid 300 is greater than or equal to 2 mm 2 / s (100℃) and less than or equal to 8 mm 2 / s (100℃). Optionally, the viscosity of the cooling liquid 300 is 3 mm 2 / s (100℃). Optionally, the viscosity of the cooling liquid 300 is 4.2 mm 2 / s (100℃). Optionally, the viscosity of the cooling liquid 300 is 5.5 mm 2 / s (100℃). Optionally, the viscosity of the cooling liquid 300 is 7.6 mm 2 / s (100℃).

[0051] In some embodiments, the volume ratio of the cooling liquid 300 arranged in the shell 210 is greater than or equal to 10% and less than or equal to 50%. The volume ratio of the cooling liquid 300 arranged in the shell 210 refers to the volume of the cooling liquid 300 arranged in the shell 210 relative to the internal accommodating space of the entire shell 210, i.e., the ratio of the volume of the cooling liquid 300 to the volume of the internal accommodating space of the shell 210. Optionally, the volume ratio of the cooling liquid 300 arranged in the shell 210 is 15%. Optionally, the volume ratio of the cooling liquid 300 arranged in the shell 210 is 20%. Optionally, the volume ratio of the cooling liquid 300 arranged in the shell 210 is 30%. Optionally, the volume ratio of the cooling liquid 300 arranged in the shell 210 is 45%.

[0052] By setting the thermal conductivity of the cooling liquid 300, the viscosity of the cooling liquid 300, and the volume ratio of the cooling liquid 300 arranged in the shell 210, the cooling liquid 300 can sufficiently cool the motor 200, improving the heat dissipation performance of the motor 200 and the heat dissipation performance of the outdoor walking device 100.

[0053] Optionally, the cooling liquid 300 can be a vegetable oil. Optionally, the cooling liquid 300 can be a mineral oil. Optionally, the cooling liquid 300 can be a synthetic oil. Optionally, the cooling liquid 300 can also be any other medium that meets the above conditions of the cooling liquid 300. Optionally, the cooling liquid 300 can be composed of one or several mediums, which are not limited in the present application.

[0054] In some embodiments, the motor 200 further comprises a rotation blocking assembly 400, which is arranged in the housing 210, and the rotation blocking assembly 400 at least comprises a blocking part 410 for blocking the rotation of the cooling liquid 300. When the motor 200 is running, the cooling liquid 300 in the housing 210 rotates at high speed under the driving of the rotor 240, which can form a vortex, causing the liquid surface close to the housing 210 to be lifted, and the liquid surface close to the output shaft 220 to be depressed, thereby reducing the area of the cooling liquid 300 in contact with the winding of the motor 200, and reducing the heat transfer effect of the cooling liquid 300 on the heat generated by the winding of the motor 200 to the housing 210. By arranging the rotation blocking assembly 400, the probability of the cooling liquid 300 forming a vortex under the driving of the rotor 240 can be reduced, or the cooling liquid 300 forming a vortex under the driving of the rotor 240 can be suppressed, thereby improving the heat transfer effect of the cooling liquid 300.

[0055] In some embodiments, the number of the plurality of blocking parts 410 can be 4. In some embodiments, the number of the plurality of blocking parts 410 can be 5. In some embodiments, the number of the plurality of blocking parts 410 can be 6. In some embodiments, the number of the plurality of blocking parts 410 can be 10. In some embodiments, the number of the plurality of blocking parts 410 can be any number greater than 1.

[0056] In some embodiments, the plurality of blocking parts 410 are formed by the inner side of the housing 210 being inwardly protruded, and the blocking parts 410 are fixedly installed in the inner side of the housing 210 and integrally formed with the housing 210. As shown in Figure 3 and Figure 4 Optionally, the blocking parts 410 formed by the inner side of the housing 210 being inwardly protruded include any one or a combination of the blocking parts 410 formed by the rib positions of the side wall of the inner side of the housing 210 and the blocking parts 410 formed by the rib positions of the bottom of the inner side of the housing 210. As shown in Figure 3 and Figure 4 The plurality of blocking parts 410 fixedly installed in the inner side of the housing 210 can be fixedly installed at the side wall and the bottom of the inner side of the housing 210 at equal intervals, or fixedly installed at the side wall and the bottom of the inner side of the housing 210 at unequal intervals, which are not limited in the present application. The extension direction of the plurality of blocking parts 410 fixedly installed in the inner side of the housing 210 is substantially parallel to the output shaft 220 of the motor 200. Optionally, the blocking parts 410 formed by the rib positions can be as shown in Figure 3 andFigure 4 The cuboid shown can also be any other shape that can serve as a barrier; this application does not limit it.

[0057] In some embodiments, such as Figure 5 As shown, the blocking portion 410 formed by the inward protrusion of the inner sidewall of the housing 210 includes a portion formed by the inward protrusion of the inner sidewall of the housing 210, and the blocking portion 410 is constituted by the protruding features of the inner sidewall of the housing 210. Optionally, the protruding features of the inner sidewall of the housing 210 can be formed at equal intervals. Optionally, the protruding features of the inner sidewall of the housing 210 can also be formed at irregular intervals. Optionally, in the vertical direction of the motor 200, the width of the protruding features of the inner sidewall of the housing 210 can remain constant. Optionally, in the vertical direction of the motor 200, the width of the protruding features of the inner sidewall of the housing 210 can gradually widen from top to bottom. Optionally, in the vertical direction of the motor 200, the width of the protruding features of the inner sidewall of the housing 210 can gradually narrow from top to bottom. Optionally, in the vertical direction of the motor 200, the width of the protruding features of the inner sidewall of the housing 210 can vary randomly, and this application does not limit it. The protruding feature on the inner sidewall of the housing 210 extends in a direction that is substantially parallel to the output shaft 220 of the motor 200.

[0058] In some embodiments, the rotary stop assembly 400 can be detachably mounted to the inside of the housing 210, and the rotary stop assembly 400 and the housing 210 are formed separately. The rotary stop assembly 400 includes both a blocking portion 410 and a fixing portion 420, which is used to fix the rotary stop assembly 400 to the inside of the housing 210. In some embodiments, the fixing portion 420 and the blocking portion 410 can be integrally formed. Figure 6 As shown, the fixing part 420 can be arranged around the inner side of the housing 210 and fixedly installed on the housing 210. Optionally, the fixing part 420 can be fixedly installed on the housing 210 by screws. Optionally, the fixing part 420 can be press-fitted onto the housing 210 by the motor 200. Optionally, the blocking part 410 can be directly installed on the housing 210 based on the fixing part 420. Optionally, as... Figure 7 As shown, a groove 211 is formed on the inner sidewall and / or bottom of the housing 210 to mate with the blocking part 410, which, together with the fixing part 420, mounts the blocking part 410 onto the housing 210. Figure 6 As shown, the blocking portion 410 includes ribs installed on the inner sidewall of the housing 210 to form the blocking portion 410. Multiple blocking portions 410 can be connected to the fixing portion 420 at equal intervals or at irregular intervals. The extending direction of the multiple blocking portions 410 within the housing 210 is substantially parallel to the output shaft 220 of the motor 200.

[0059] In some embodiments, the fixing part 420 and the blocking part 410 are separately provided. A groove 211 is formed on the inner sidewall and / or bottom of the housing 210 to mate with the blocking part 410, and the blocking part 410 is inserted into the groove 211 for initial fixation. A fixing part 420 is then provided around the inner side of the housing 210, abutting against the upper part of the blocking part 410, and together with the groove 211, to complete the fixation of the blocking part 410. The fixing part 420 can be fixed to the housing 210 by screws, or it can be press-fitted to the housing 210 by the motor 200.

[0060] In some embodiments, the motor 200 further includes a pump structure 500 for pumping coolant 300 from a first end of the motor 200 to a second end of the motor 200 to dissipate heat from the motor 200. Specifically, the pump structure 500 includes a suction assembly 510 for pumping coolant 300 from the bottom end of the motor 200 to the top end of the motor 200 to dissipate heat from the windings and other structures of the motor 200. Optionally, the suction assembly 510 can be a suction pipe. Figure 8 As shown, the pump structure 500 pumps coolant 300 from the lower end of the motor 200 to the upper end of the motor 200. Optionally, the pump structure 500 can be driven by the motor 200 itself. Optionally, the pump structure 500 can also be driven by a motor other than the motor 200 in the outdoor walking device 100. Optionally, an additional motor can be added to the outdoor walking device 100 to drive the pump structure 500.

[0061] like Figure 8 As shown, the pump structure 500 also includes a liquid outlet assembly 520, and the motor 200 includes a collection assembly 530 and a spraying assembly 540. Both the collection assembly 530 and the spraying assembly 540 are disposed within the mounting space formed by the housing 210. The liquid outlet assembly 520 is used to discharge the coolant 300 pumped from the suction assembly 510 to the second end of the motor 200. The collection assembly 530 is used to collect the coolant 300 flowing out of the liquid outlet assembly 520. The spraying assembly 540 is fixed to the retainer of the motor 200 and cooperates with the collection assembly 530 to receive the coolant 300 from the collection assembly 530. Optionally, the collection assembly 530 can be an annular structure to match the structure of the motor 200. Optionally, the spraying assembly 540 can be an annular structure to match the structures of the collection assembly 530 and the motor 200.

[0062] like Figure 9 As shown, the collecting assembly 530 is disposed below the liquid outlet assembly 520. The collecting assembly 530 consists of a base plate 531 and a side wall 532, and is used to restrict the flow direction and flow position of the coolant 300 flowing out of the liquid outlet assembly 530. Optionally, as shown... Figure 10As shown, the bottom plate 531 of the collecting assembly 530 comprises a first limiting structure 533 which is concave downward, so that the cooling liquid 300 can be confined in the first limiting structure 533 after flowing into the collecting assembly 530. As shown in Figure 8 and Figure 10 As shown, the collecting assembly 530 comprises at least one hole 534 for flowing out the cooling liquid 300 downward. The at least one hole 534 is arranged on the first limiting structure 533 for flowing out the cooling liquid 300 downward.

[0063] As shown in Figure 9 and Figure 10 The spraying assembly 540 is arranged below the collecting assembly 530, and the spraying assembly 540 comprises a top plate 541 and a second limiting structure 542 which is a structure concave downward arranged on the spraying assembly 540. In the up-down direction of the motor 200, the second limiting structure 542 is below the top plate 541. The top plate 541 is used for receiving the cooling liquid 300 flowing out from the hole 534 of the collecting assembly 530, and the second limiting structure 542 is used for receiving the cooling liquid 300 from the top plate 541. The spraying assembly 540 comprises at least one spraying hole 543 for spraying the cooling liquid 300 to the motor 200. As shown in Figure 11 the spraying hole 543 is arranged on the second limiting structure 542 for flowing out the cooling liquid 300 downward, so that the cooling liquid 300 can flow to the winding of the motor 200.

[0064] Optionally, in order to facilitate the cooperation between the spraying assembly 540 and the collecting assembly 530, the diameter of the ring of the spraying assembly 540 can be the same as the diameter of the ring of the collecting assembly 530. Optionally, in the up-down direction of the motor 200, the second limiting structure 542 corresponds to the first limiting structure 533, and the second limiting structure 542 and the first limiting structure 533 pass through the same circle in the up-down direction of the motor 200. Optionally, the circle in the up-down direction of the motor 200 passed by the second limiting structure 542 is larger than the circle in the up-down direction of the motor 200 passed by the first limiting structure 533, that is, the second limiting structure 542 is closer to the housing 210 than the first limiting structure 533, and the first limiting structure 533 is closer to the output shaft 220 of the motor 200 than the second limiting structure 542.

[0065] In some embodiments, the motor 200 comprises at least one liquid flow path 600, and the liquid flow path 600 comprises a liquid inlet 610 and a liquid outlet 620 which are open inside the motor 200. Optionally, the liquid inlet 610 is arranged inside the lower side of the motor 200, and the liquid outlet 620 is arranged inside the upper side of the motor 200. Optionally, the liquid flow path 600 is a spiral channel.

[0066] In some embodiments, the housing 210 of the motor 200 is internally formed with a plurality of limiting structures (i.e., third limiting structures), and a liquid flow path 600 is formed between adjacent limiting structures of the plurality of third limiting structures. The plurality of third limiting structures are outwardly protruded from the inner side of the housing 210 and integrally formed with the housing. In the up-down direction of the motor 200, the third limiting structures are in a spiral shape. The motor 200 further comprises fourth limiting structures matched with the third limiting structures, and the fourth limiting structures are arranged at the upper portion of the inner side of the housing 210. When the motor 200 is in operation, the liquid flow path 600 formed by the third limiting structures guides the cooling liquid 300 from the liquid inlet 610 at the lower portion to the liquid outlet 620 at the upper portion, and then the fourth limiting structures limit the cooling liquid 300 at the liquid outlet 620, so that the cooling liquid 300 falls from the top of the motor 200 to spray on the winding of the motor 200, thereby further improving the heat dissipation effect of the cooling liquid 300 on the winding of the motor 200.

[0067] In some embodiments, the motor 200 comprises a second guide 700 arranged at the inner side of the housing 210 for forming the liquid flow path 600. Optionally, the second guide 700 is detachably mounted to the inner side of the housing 210. Optionally, the second guide 700 is fixedly mounted to the inner side of the housing 210. As shown in FIG. 7, the second guide 700 comprises a first guide portion 710 arranged at the inner side of the housing 210 and a second guide portion 720 arranged at the upper portion of the inner side of the housing 210, and the first guide portion 710 and the second guide portion 720 are integrally formed. Figure 12 The first guide portion 710 is in a spiral shape, so that a spiral-shaped liquid flow path 600 is formed between adjacent first guide portions 710. Optionally, the number of the first guide portions 710 can be any number greater than 1. The second guide portion 720 is used to guide the cooling liquid 300 to the winding of the motor 200 via the liquid flow path 600 to the upper portion of the motor 200. Optionally, the second guide 700 is further mounted to the inner side of the housing 210 through the second guide portion 720. The second guide portion 720 can be mounted to the inner side of the housing 210 by screws. When the motor 200 is in operation, the liquid flow path 600 formed by the first guide portion 710 guides the cooling liquid 300 from the liquid inlet 610 at the lower portion to the liquid outlet 620 at the upper portion, and then the second guide portion 720 guides the cooling liquid 300 at the liquid outlet 620, so that the cooling liquid 300 falls from the top of the motor 200 to spray on the winding of the motor 200.

[0068] In some embodiments, a liquid flow path 600 is formed on the rotor 240, wherein an inlet 610 of the liquid flow path 600 is formed at one end of the rotor 240, and an outlet 620 of the liquid flow path 600 is formed at the other end of the rotor 240. For example... Figure 13 As shown, a liquid inlet 610 is formed at the lower end of the rotor 240, and a liquid outlet 620 is formed at the upper end of the rotor 240. Thus, when the rotor 240 rotates, coolant 300 flows in from the lower liquid inlet 610 and flows out through the liquid flow path 600 to the upper liquid outlet 620. The number of liquid flow paths 600 can be any number greater than one, and this application does not limit it.

[0069] The motor 200 also includes a first guide 800, which is disposed at the outlet 620 and can at least change the flow direction of the coolant 300 flowing out of the outlet 620. Specifically, the first guide 800 guides the coolant 300 flowing out of the outlet 620 onto the windings of the motor 200, causing the coolant 300 to fall back from the top of the motor 200 and spray onto the windings. Optionally, the first guide 800 can be as follows: Figure 13 The shape of the guide plate is shown. Optionally, the first guide 800 can also be any other shape capable of guiding, which is not limited in this application. Optionally, the first guide 800 can be fixed to the housing 210, specifically fixed to the upper side of the housing 210. Optionally, the number of first guides 800 is greater than or equal to the number of outlets 620, so as to guide the coolant 300 flowing out of the outlets 620. Optionally, the first guides 800 can be arranged on both sides of the outlets 620, so that the coolant 300 can be guided whether it flows to the left or right after flowing out of the outlets 620.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric power tool, comprising: a tool body; at least one motor arranged in the tool body; the motor comprising: a housing; a stator and a rotor arranged in the housing; a cooling liquid arranged in the housing, the cooling liquid being in contact with the rotor; characterized in that the motor further comprises: a rotation blocking assembly arranged in the housing, the rotation blocking assembly comprising at least a blocking part for blocking rotation of the cooling liquid.

2. The power tool of claim 1, wherein, a plurality of the blocking parts are formed on the inner side of the housing by protruding inwardly.

3. The power tool of claim 1, wherein, the rotation blocking assembly is detachably mounted to the inner side of the housing.

4. The power tool of claim 1, wherein, the rotation blocking assembly is fixedly mounted to the inner side of the housing.

5. The power tool of claim 1, wherein, an extension direction of the blocking part in the housing is substantially parallel to an output shaft of the motor.

6. The power tool of claim 1, wherein, the rotation blocking assembly comprises a fixing part, and the rotation blocking assembly is fixedly mounted to the inner side of the housing based on the fixing part.

7. The power tool of claim 1, wherein, the motor further comprises a pump structure arranged to be driven by the motor to pump the cooling liquid from a first end of the motor to a second end of the motor.

8. The power tool of claim 7, wherein, the motor further comprises a collecting assembly arranged to collect the cooling liquid pumped to the second end of the motor.

9. The power tool of claim 8, wherein, the motor further comprises a spraying assembly fixed on a retainer of the motor, the spraying assembly receiving the cooling liquid from the collecting assembly, and the spraying assembly comprising at least one spraying hole for spraying the cooling liquid to the motor.

10. The power tool of claim 1, wherein, a power of the motor is greater than or equal to 2kW and less than or equal to 10kW.

11. The power tool of claim 1, wherein, a rotating speed of the motor is greater than or equal to 2000RPM and less than or equal to 7000RPM.

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