Motor waterproof structure and electric tool

Abstract

The utility model discloses a waterproof structure of a motor, which is used for covering a driving plate connected to the motor and comprises a protective cover and a sealing glue layer, the protective cover is detachably arranged on the motor and surrounds part of the driving plate, and a gap is formed between the protective cover and the driving plate; and the sealing glue layer is filled in the gap and covers part of the driving plate. The sealing glue layer is formed through pouring, so that the driving plate is isolated from water, the driving plate is prevented from being affected with damp, short circuit and even corrosion, and the stability and the safety are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power tools, and particularly relates to a waterproof structure on a motor and a power tool having the motor waterproof structure. Background Technique

[0002] If a power tool containing a motor is frequently used in a humid environment, it will inhale water or a water-containing gas mixture. Even in the case of long-term use, humid gas will still enter the motor area. When it accumulates gradually, water droplets will be formed and flow in along the power supply lines and signal lines of the circuit board. The welding part of the power supply line and the circuit board uses protective glue (to prevent short circuit caused by the bifurcation of the power supply line core), so obvious corrosion phenomena rarely occur; while the signal line is directly connected to the circuit board by a terminal. After water flows into the terminal from the signal line and then into the circuit board, the circuit board will show short circuit and corrosion phenomena.

[0003] Therefore, in view of the above technical problems, it is necessary to provide a waterproof structure for the motor.

[0004] The information disclosed in this background art section is only intended to enhance the understanding of the overall background of the utility model and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a motor waterproof structure for preventing short circuit and corrosion of the motor circuit board caused by water or water vapor.

[0006] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0007] The utility model provides a motor waterproof structure for covering a drive board connected to a motor, including a protective cover and a sealing glue layer. The protective cover is detachably mounted on the motor and surrounds part of the drive board, and a gap is formed between the protective cover and the drive board; the sealing glue layer is filled in the gap and covers part of the drive board.

[0008] In one or more embodiments of the utility model, the drive board includes a first surface and a second surface arranged opposite to each other, and the gap is formed between the first surface and the protective cover and between the second surface and the protective cover.

[0009] In one or more embodiments of the utility model, the height of the part of the sealing glue layer covering the first surface and the second surface is less than 1 mm.

[0010] In one or more embodiments of the utility model, the sealing glue layer is formed by curing an electronic potting glue.

[0011] In one or more embodiments of the present utility model, the protective cover is formed with a groove, and the depth of the groove is greater than the thickness of the driving plate.

[0012] In one or more embodiments of the present utility model, the protective cover is a closed cover body.

[0013] In one or more embodiments of the present utility model, a channel for the electronic potting adhesive to flow through is formed between the side wall of the groove and the side wall of the driving plate.

[0014] In one or more embodiments of the present utility model, the curing time of the electronic potting adhesive is not less than 24 hours.

[0015] In one or more embodiments of the present utility model, the driving plate and the protective cover are respectively provided with mating mounting holes.

[0016] The present utility model further provides a power tool, including the motor waterproof structure as described above.

[0017] Compared with the prior art, the motor waterproof structure of the present utility model completely covers the driving plate through the potting adhesive layer, so that the driving plate is completely isolated from moisture to prevent the driving plate from short - circuiting and being corroded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of a motor in an embodiment of the present utility model;

[0020] Figure 2 Partial enlarged view of the motor in an embodiment of the present utility model.

[0021] Main reference numerals description:

[0022] 10 - driving plate, 11 - first surface, 12 - second surface, 20 - protective cover, 21 - groove, 22 - channel, 30 - potting adhesive layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To enable those skilled in the art to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] As Figure 1 and 2 shown, the motor waterproof structure in an embodiment of the present utility model is used to cover the drive board 10 of the motor to prevent the drive board 10 from being corroded by water or water vapor, and it includes a protective cover 20 and a sealant layer 30. The protective cover 20 is installed on the motor and is disposed outside the drive board 10. The protective cover 20 is disposed opposite to the drive board 10, and a gap is formed between them. The sealant layer 30 is filled in the gap, and the sealant layer 30 covers the drive board 10 to isolate moisture.

[0025] Since the drive board 10 includes a circuit board and a plurality of electronic components, and the electronic components protrude from the surface of the circuit board, the overall surface of the drive board 10 is not flat, and an ordinary protective cover cannot completely cover it. Therefore, in this embodiment, the sealant layer 30 is filled into the gap between the protective cover 20 and the drive board 10 to completely isolate the drive board 10 from moisture, which can prevent moisture from corroding the drive board 10, and further avoid the situation of short circuit or even burnout, ensuring the long-term stable operation of the device.

[0026] It should be understood that after the sealant layer 30 is provided, the waterproof and sealing functions are provided by the sealant layer 30, and the protective cover 20 can be removed without damaging the sealant layer 30.

[0027] It can be conceived that the drive board 10 includes a first surface 11 and a second surface 12 that are disposed opposite to each other, wherein the first surface 11 faces the protective cover 20, and the gap is formed between the first surface 11 and the protective cover 20, while the second surface 12 faces away from the protective cover 20. Since solder feet or other components are formed on the second surface 12, the second surface 12 also needs to be covered. Therefore, the sealant layer 30 covers both the first surface 11 and the second surface 12 to achieve comprehensive protection of the drive board 10.

[0028] Preferably, to ensure the heat dissipation effect, the thickness of the sealant layer 30 covering the first surface 11 and the second surface 12 is less than 1 mm to prevent the situation of burnout caused by excessive thickness and too high internal temperature.

[0029] In a preferred embodiment, the potting layer 30 is formed by curing an electronic potting compound. The electronic potting compound is in a liquid state before curing and has fluidity, so it can cover the entire driving board 10. After complete curing, it can play roles such as waterproofing, moisture-proofing, dust-proofing, insulation, heat conduction, confidentiality, anti-corrosion, temperature resistance, and shock resistance.

[0030] To ensure that the electronic potting compound is completely cured to form the potting layer 30, its curing time is not less than 24 hours. Of course, after exceeding the initial curing time, the electronic potting compound is initially cured, and at this time, the electronic potting compound no longer flows, and the posture of the device can be adjusted.

[0031] As Figure 2 shown, the protective cover 20 is formed with a groove 21, and the thickness of the groove 21 is greater than the thickness of the driving board 10. Therefore, after installation, the edge of the protective cover 20 extends outside the second surface 12. Therefore, when pouring the electronic potting compound, the second surface 12 is facing upward. After the electronic potting compound fills the gap between the first surface 11 and the protective cover 20, it overflows to the second surface 12 and completely covers it, and then waits for curing.

[0032] It can be imagined that to ensure that the electronic potting compound stays completely between the protective cover 20 and the driving board 10, the outlet for the wire in the protective cover 20 in this embodiment is cancelled, and a closed cover design is adopted to prevent the leakage of the electronic potting compound.

[0033] To facilitate the upward overflow of the electronic potting compound from one side of the first surface 11 to above the second surface 12, the diameter of the groove 21 is greater than the diameter of the driving board 10. Therefore, a channel 22 is formed between the side wall of the driving board 10 and the inner wall of the groove 21, and the channel 22 is for the electronic potting compound to pass through.

[0034] In an embodiment, the driving board 10 and the protective cover 20 are respectively provided with mating mounting holes, and the protective cover 20 is fixed to the driving board 10 and the motor through bolts.

[0035] It can be imagined that in this embodiment, the protective cover 20 is mainly used to provide a shaping function for the potting layer 30, and the main protection function is provided by the potting layer 30. Therefore, the protective cover 20 can also be fixed to the motor by snap-fastening or other means, and this embodiment does not limit.

[0036] The present utility model also provides an electric tool provided with the above-mentioned motor waterproof structure to achieve all-round protection of the driving board 10.

[0037] Here, in combination with a specific scenario, the motor waterproof structure and the electric tool in this embodiment are further described.

[0038] After the motor is assembled, install the protective cover 20. Then invert the motor so that the second side 12 of the drive board 10 faces upward, and drip in liquid electronic potting glue (here, the model of the electronic potting glue is 6601 black, the initial curing time is 1 hour, and the complete curing time is 24 hours). Control the dripping amount between 15 and 20 g, and the covering height of the first side 11 and the second side 12 is less than 1 mm, so as to prevent the electronic potting glue from overflowing without affecting heat dissipation, and completely cover the drive board 10 and electronic components. Before curing, the electronic potting glue is in a liquid flowing state. Let the motor stand still for 2 to 3 minutes, and the electronic potting glue is in a free leveling state and completely covers the drive board 10 and all electronic components. Finally, let it stand still for no less than 24 hours to make the electronic potting glue completely cured. After hardening, the power tool can operate stably at high temperature for a long time, without cracking, resulting in component damage or desoldering, and can isolate moisture, prevent corrosion and short circuit of the drive board 10, and improve safety and stability.

[0039] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A waterproof structure for a motor, which is used to cover a drive board connected to the motor, characterized in that, Comprising: A protective cover detachably mounted on the motor and surrounding part of the drive board, with a gap formed between the protective cover and the drive board; A potting layer formed by curing an electronic potting compound; The drive board includes a first surface and a second surface disposed opposite to each other, wherein The electronic potting compound overflows to the second surface and completely covers the second surface after filling the gap between the first surface and the protective cover.

2. The motor waterproof structure according to claim 1, characterized in that, The height of the potting layer covering the portions of the first surface and the second surface is less than 1 mm.

3. The motor waterproof structure according to claim 2, characterized in that, The protective cover is formed with a groove, and the depth of the groove is greater than the thickness of the drive board.

4. The motor waterproof structure according to claim 3, characterized in that, The protective cover is a closed cover body.

5. The motor waterproof structure according to claim 4, wherein A channel for the electronic potting compound to flow through is formed between the side wall of the groove and the side wall of the drive board.

6. The motor waterproof structure according to claim 1, characterized in that, The curing time of the electronic potting compound is not less than 24 hours.

7. The motor waterproof structure according to claim 1, characterized in that, Mounting holes are respectively formed on the drive board and the protective cover and are matched with each other.

8. An electric tool, characterized in that, Including the motor waterproof structure according to any one of claims 1-7.

Images