Waterproof motor and electric tool

Abstract

The utility model discloses a waterproof motor and an electric tool. The waterproof motor comprises a stator assembly, a rotor assembly and two cover plates, the stator assembly comprises a stator iron core, a coil wound on the stator iron core and a wrapping body which at least partially wraps the stator iron core and is tightly jointed with the stator iron core, and the stator iron core is provided with a through channel; the rotor assembly is arranged in the channel and comprises a rotating shaft, and the rotating shaft extends out of the two ends of the channel; the two cover plates are arranged at the two ends of the channel respectively and connected with the channel in a sealed mode. According to the waterproof motor, the wrapping body which completely wraps the stator iron core and the coil is adopted to replace a traditional base, so that the stator iron core and the coil are completely isolated from water, and the overall sealing performance of the motor is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electric tools, and specifically relates to an improved waterproof motor, and an electric tool using the waterproof motor. Background Art

[0002] Power tools are commonly used tools in daily life and work, and their application scenarios are very wide. When used in a water environment, the motor part of the tool needs to be waterproofed. At present, power tools do not have special protection in terms of waterproofing. They are only waterproofed by simple methods such as winding varnishing and powder coating. This can ensure that the coil does not leak electricity to a certain extent, but the stator and rotor themselves are not effectively waterproofed. Therefore, after long-term use, the stator and rotor may rust, seriously affecting the performance and life of the motor. In addition, the existing motors usually have the stator core set in the base. Since the sealing of the base itself is not good enough, it is easy for water to enter and damage the inside of the motor.

[0003] Therefore, in view of the above technical problems, it is necessary to provide an improved waterproof motor to solve the above problems.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0005] Application Contents

[0006] The purpose of the present application is to provide a waterproof motor, which has an improved waterproof design to improve the waterproof effect of the motor and ensure long-term operation of the motor.

[0007] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the present application is as follows:

[0008] The present application provides a waterproof motor, comprising a stator assembly, a rotor assembly and two cover plates, wherein the stator assembly comprises a stator core, a coil wound around the stator core, and a sheath at least covering the stator core and tightly engaging with the stator core, wherein the stator core has a through channel; the rotor assembly is arranged in the channel, and the rotor assembly comprises a rotating shaft, and the rotating shaft extends out of both ends of the channel; the two cover plates are respectively arranged at both ends of the channel, and the two cover plates are sealed and connected to both ends of the channel.

[0009] In one or more embodiments of the present application, the cladding body is integrally formed on the outer surface of the stator core.

[0010] In one or more embodiments of the present application, the coating is formed by injection molding, and the coating is a potting glue coating the stator core and the coil.

[0011] In one or more embodiments of the present application, the surface of the stator core is covered with a waterproof layer, and the waterproof layer is formed by powder coating or injection molding.

[0012] In one or more embodiments of the present application, the cover plate includes an annular support member and a shell covering the support member, the shell includes a first fitting portion formed on the outer circle of the support member, and the first fitting portion is tightly fitted with the inner wall of the channel; the cover plate is formed with a through hole for the rotating shaft to pass through, and the shell also includes a second fitting portion formed on the inner circle of the support member, and the second fitting portion is tightly fitted with the rotating shaft.

[0013] In one or more embodiments of the present application, the shell is made of elastic material, and / or the support member is made of hard material.

[0014] In one or more embodiments of the present application, the shell further includes a connecting portion connected to the first fitting portion and the second fitting portion, and the size of the first fitting portion and / or the second fitting portion in the axial direction of the through hole is larger than the size of the connecting portion in the axial direction of the through hole.

[0015] In one or more embodiments of the present application, the support member extends into the first fitting portion and / or the second fitting portion.

[0016] In one or more embodiments of the present application, lubricating oil is coated between the inner wall of the second fitting portion and the outer wall of the rotating shaft, and the lubricating oil and water are immiscible with each other.

[0017] The present application also provides an electric tool, comprising the waterproof motor and housing as described above, wherein the housing accommodates the waterproof motor, and the coating is at least partially in contact with the housing; or, the surface of the stator core is covered with a waterproof layer, and the waterproof layer is at least partially in contact with the housing.

[0018] Compared with the prior art, the waterproof motor of the present application uses a coating body to completely cover the wound stator core, so that the entire stator core and coil are completely covered and isolated from moisture, thereby preventing moisture erosion and short circuit problems, thereby improving stability during operation and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of a waterproof motor in one embodiment of the present application;

[0021] Figure 2 A cross-sectional view of a waterproof motor in one embodiment of the present application;

[0022] Figure 3 A side view of a waterproof motor in one embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of a cover plate in one embodiment of the present application;

[0024] Figure 5 A cross-sectional view of a cover plate in one embodiment of the present application;

[0025] Figure 6 It is a cross-sectional view of a cover plate in another embodiment of the present application.

[0026] Description of main reference numerals:

[0027] 100 - waterproof motor, 11 - stator core, 12 - coil, 13 - covering body, 14 - cover plate, 141 - support member, 142 - first fitting part, 143 - through hole, 144 - second fitting part, 145 - connecting part, 15 - channel, 21 - rotating shaft. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0029] like Figure 1-5 As shown, a waterproof motor 100 in an embodiment of the present application includes a stator assembly, a rotor assembly and two cover plates 14. The stator assembly includes a stator core 11 and a coil 12 wound around the stator core 11, and a coating 13 at least partially coated on the stator core 11 and tightly joined to the stator core 11. The stator core 11 is formed with a through channel 15. The rotor assembly is disposed in the channel 15, and includes a rotating shaft 21 extending outwardly to the outside of the channel 15. The two cover plates 14 are respectively disposed at both ends of the channel 15 and are sealed and connected to the channel 15.

[0030] The conventional motor has a base, and the stator core is detachably arranged in the base, and the base is provided with a plurality of mounting parts for mounting other components, which inevitably leads to a large number of gaps or free spaces, which easily leads to water ingress. The present application takes a different approach, abandoning the conventional base, and adopts a sheath 13 that at least partially covers the stator core 11 and is tightly joined to the stator core 11 to replace the conventional base, and the sheath 13 at least wraps the end portion of the stator core 11 to improve the waterproof performance of the waterproof motor 100.

[0031] It should be understood that the coating 13 can also completely cover the stator core 11 and / or the coil 12 at the same time, so that the stator core 11 and the coil 12 are completely isolated from water, further improving the sealing of the motor, as well as the stability and safety during operation.

[0032] In addition, two covers 14 are used to seal both ends of the channel 15 , thereby further improving the waterproof effect and preventing moisture from entering the channel 15 .

[0033] In one embodiment, the covering body 13 is integrally formed on the outer surface of the stator core 11 , and completely covers the stator core 11 and the coil 12 without any gap.

[0034] Specifically, the coating 13 is formed by injection molding, for example, after the stator core 11 wound with the coil 12 is placed in a mold that can be formed into a certain shape, the electronic potting glue is poured in, and the coating 13 is formed after the electronic potting glue is cured. After curing, the electronic potting glue can play the role of waterproof, moisture-proof, dust-proof, insulating, heat-conductive, confidential, anti-corrosion, temperature-resistant and shock-proof, and can well protect the internal stator core 11 and coil 12, and improve the use range of the waterproof motor 100 and the stability during use.

[0035] Optionally, the end portion of the stator core 11 may be coated with the coating 13, and the middle portion may be treated with a waterproof layer, so that the coating 13 and the waterproof layer can jointly waterproof the surface of the stator core 11. Furthermore, a waterproof layer (not shown) may be covered on the surface of the stator core 11 to give the stator core 11 a double waterproof effect. In this case, even if the coating 13 is damaged or causes water seepage due to other reasons, the waterproof layer can continue to prevent moisture from corroding the stator core 11, thereby further improving the overall waterproof performance.

[0036] In one embodiment, the waterproof layer is formed by powder coating or spraying, and a dense waterproof coating is formed by coating or spraying powder on the surface of the stator core 11 to improve the waterproof and rust-proof effect of the stator core 11. Of course, in other embodiments, the stator core 11 can be coated by injection molding to form a waterproof layer, and then the coil 12 is formed by winding, and finally the electronic potting glue is poured to form the coating 13.

[0037] See also Figure 4 As shown, in one embodiment, the cover plate 14 is in a hollow circular shape and is arranged at both ends of the opening of the channel 15. The cover plate 14 includes an annular support member 141 and a shell wrapped around the support member 141, wherein the shell includes a first fitting portion 142 formed on the outer circle of the support member 141, and the first fitting portion 142 is tightly fitted with the inner wall of the channel 15 to prevent moisture from penetrating into the interior along the inner wall of the channel 15.

[0038] It is easy to imagine that the cover plate 14 is formed with a through hole 143 for the rotating shaft 21 to pass through. In order to prevent moisture from penetrating into the interior along the gap between the through hole 143 and the rotating shaft 21, the shell is formed with a second fitting portion 144 on the outer wall of the through hole 143 (the inner circle of the support member 141). The second fitting portion 144 is tightly against the rotating shaft 21 to prevent moisture from penetrating.

[0039] In one embodiment, the shell is made of elastic material (such as rubber, etc.), so the two can produce a certain degree of deformation, and can fit more closely with the inner wall of the channel 15 and the outer wall of the shaft 21, thereby increasing the contact area and preventing moisture from penetrating.

[0040] It is conceivable that if all rubber materials are used, the entire cover plate 14 is soft and prone to overall deformation, which is not conducive to stability during operation. Therefore, in one embodiment, the support member 141 can be made of a hard material (such as nylon, etc.) to increase the hardness of the main body and prevent excessive deformation.

[0041] In addition to the first fitting portion 142 and the second fitting portion 144, the shell also includes a connecting portion 145 connecting the two fitting portions to achieve complete covering of the support member 141. Preferably, the size of the first fitting portion 142 and / or the second fitting portion 144 in the axial direction of the through hole 143 can be larger than the size of the connecting portion 145 in the axial direction of the through hole 143, that is, the first fitting portion 142 and the second fitting portion 144 protrude from the plane where the support member 141 is located to both sides, so that the overall cross-section of the cover plate 14 is I-shaped, and the protruding portions on both sides of the first fitting portion 142 and the second fitting portion 144 can provide a certain support effect to prevent the cover plate 14 from moving or tilting to one side to improve stability. Therefore, the first fitting portion 142 and the second fitting portion 144 can improve the sealing and waterproof effect between the cover plate 14 and the encapsulation body 13 and the rotating shaft 21, and can also increase the contact area to improve the stability of the waterproof motor 100 during operation.

[0042] like Figure 6As shown, in another embodiment, in order to further improve the support and stability of the cover plate 14, the outer circle or inner circle of the support member 141 can be extended to the first fitting portion 142 or the second fitting portion 144 (or extended simultaneously), that is, the support member 141 is set to have an I-shaped cross-section, so that the first fitting portion 142 and the second fitting portion 144 have hard support inside, so as to improve the stability of the two fitting portions and reduce the deformation range.

[0043] In one embodiment, lubricating oil may be applied to the inner wall of the second fitting portion 144 or the outer wall of the shaft 21 to prevent excessive friction from affecting the normal rotation of the shaft 21. Lubricating oil and water are immiscible, which can further prevent moisture from penetrating.

[0044] At the same time, after the cover plate 14 is installed on the covering body 13, in order to facilitate its removal, the first fitting portion 14 can be configured to protrude from the axial surface of the covering body 13 to provide a contact position for the operator or the removal tool to grasp.

[0045] In summary, compared to ordinary motors, the waterproof motor 100 in this embodiment uses a coating body 13 to completely cover the stator core 11 and the coil 12, isolating the stator core 11 and the coil 12 from water, thereby greatly improving the waterproof effect of the stator core 11 and the coil 12, preventing leakage, as well as performance and life degradation due to rust, and improving the use time and stability during use.

[0046] The present application also provides an electric tool using the waterproof motor 100, which has a housing for accommodating the waterproof motor 100, wherein the coating 13 is at least partially in contact with the tool housing, or the surface of the stator core 11 is covered with a waterproof layer, and the waterproof layer is at least partially in contact with the housing. Since the waterproof motor 100 has excellent waterproof performance, the electric tool using it also has excellent waterproof performance, can be used in harsher use environments, and has high stability.

[0047] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0048] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A waterproof motor, characterized in that: include: A stator assembly comprises a stator core (11), a coil (12) wound around the stator core (11), and a covering body (13) at least partially covering the stator core (11) and tightly joined to the stator core (11), wherein the stator core (11) has a through passage (15); a rotor assembly, disposed in the channel (15), the rotor assembly comprising a rotating shaft (21), the rotating shaft (21) extending out of both ends of the channel (15); and Two cover plates (14) are respectively arranged at two ends of the channel (15), and the two cover plates (14) are sealed and connected to the two ends of the channel (15).

2. The waterproof motor according to claim 1, characterized in that: The cladding body (13) is integrally formed on the outer surface of the stator core (11).

3. The waterproof motor according to claim 2, characterized in that: The coating (13) is formed by casting or injection molding, and the coating (13) is a potting glue coating the outside of the stator core (11) and the coil (12).

4. The waterproof motor according to claim 1, characterized in that: The surface of the stator core (11) is covered with a waterproof layer, and the waterproof layer is formed by powder coating or injection molding.

5. The waterproof motor according to claim 1, characterized in that: The cover plate (14) comprises an annular support member (141) and a shell covering the support member (141); the shell comprises a first fitting portion (142) formed on the outer circle of the support member (141); the first fitting portion (142) is tightly fitted with the inner wall of the channel (15); the cover plate (14) is formed with a through hole (143) for the rotating shaft (21) to pass through; the shell further comprises a second fitting portion (144) formed on the inner circle of the support member (141); the second fitting portion (144) is tightly fitted with the rotating shaft (21).

6. The waterproof motor according to claim 5, characterized in that: The shell is made of elastic material, and / or the support member (141) is made of hard material.

7. The waterproof motor according to claim 5, characterized in that: The shell also includes a connecting portion (145) connected to the first fitting portion (142) and the second fitting portion (144), and the axial size of the first fitting portion (142) and / or the second fitting portion (144) in the through hole (143) is larger than the axial size of the connecting portion (145) in the through hole (143).

8. The waterproof motor according to claim 5, characterized in that: The support member (141) extends into the first fitting portion (142) and / or the second fitting portion (144).

9. The waterproof motor according to claim 7, characterized in that: Lubricating oil is coated between the inner wall of the second fitting portion (144) and the outer wall of the rotating shaft (21), and the lubricating oil and water are insoluble in each other.

10. An electric tool, characterized in that: A waterproof motor as claimed in any one of claims 1 to 9; A shell for accommodating the waterproof motor, wherein the encapsulation body (13) is at least partially in contact with the shell; or, The surface of the stator core (11) is covered with a waterproof layer, and at least part of the waterproof layer is in contact with the outer shell.

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