A waterproof device for an electric motor and its waterproof method

Abstract

The present invention discloses a waterproof device for a motor and a waterproof method in the technical field of motor windshields, which includes a self-fan-cooled motor with a rear end cover and a fan, and a windshield fixedly installed on the rear end cover to cover the fan. The windshield includes a first windshield component installed at the rear of the rear end cover and a second windshield component installed at the rear of the first windshield component. The fan blades of the fan are spiral fan blades, and the material of the fan is a heat-conducting metal capable of exchanging heat with the rotor of the motor. A negative pressure area is created in front of the fan, allowing the air outside the motor to rush into this negative pressure area through the air inlet, accelerating the flow of the air outside the motor, and thus accelerating the heat dissipation of the motor housing. By using the first windshield component and the second windshield component, it can not only prevent the external water liquid from splashing onto the fan, but also filter the air entering the inner cavity of the windshield.

Description

Technical Field

[0001] This invention relates to the field of electric motor shroud technology, specifically to a waterproof device and waterproofing method for electric motors. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy. During this energy conversion, a small portion of the energy is lost and converted into heat, which must be continuously dissipated through the motor casing and the surrounding medium. In a self-ventilated electric motor, the rear shaft of the rotor extends rearward to the rear end cover of the motor to mount a fan. The rear end cover is fitted with a shroud that covers the fan and guides the airflow, supplying cooling air to the motor surface for cooling.

[0003] For example, electric motors with model numbers YBX3 and YBX4 on the market are cooled by a fan located at the tail end of the motor and driven by the motor rotor.

[0004] However, it has the following drawbacks:

[0005] 1. If a thrust fan is used for cooling, the air enters through the ventilation holes on the rear wall of the fan shroud, blows directly onto the rear end cover of the motor, and bounces back. The air driven by the fan only exchanges heat with the rear end cover of the motor. Therefore, the cooling effect on the motor casing is poor. In addition, external water splashes into the fan inside the fan shroud through the ventilation holes on the rear wall of the fan shroud.

[0006] 2. If a centrifugal fan is used for cooling, the air enters through the ventilation holes on the rear wall of the fan shroud, is centrifuged by the fan, and then blown along the inner wall of the shroud (which is curved) towards the cooling fins of the motor housing. Therefore, a ventilation gap is required between the rear end cover of the motor and the fan shroud mounted on it, allowing external water to splash into the fan inside the shroud through this gap, or vice versa.

[0007] Based on this, the present invention designs a waterproof device and waterproofing method for electric motors to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a waterproof device and method for electric motors, in order to solve the problems mentioned in the background art, such as the self-ventilated electric motor having a ventilation hole on the rear wall of the fan cover for introducing air, which allows external water to splash into the inner cavity of the fan cover through the ventilation hole, and the self-ventilated electric motor using a centrifugal fan having a ventilation gap between the rear end cover and the fan cover installed on the rear end cover, which allows external water to splash into the inner cavity of the fan cover through the gap.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A waterproof device for an electric motor includes a self-ventilated electric motor with a rear end cover and a fan, and a fan cover fixedly mounted on the rear end cover to cover the fan. The fan cover includes a fan cover assembly one mounted at the rear of the rear end cover and a fan cover assembly two mounted at the rear of the fan cover assembly one.

[0011] Preferably, the circumferential side of the rear end cover is evenly provided with screw holes for mounting the fan shroud assembly one. The rear shaft end of the motor rotor is located behind the rear end cover, and the fan is fixedly mounted on the rear shaft end of the motor rotor. The fan blades are spiral blades, and the fan material is a thermally conductive metal capable of exchanging heat with the motor rotor.

[0012] Preferably, the hood assembly includes a hood body installed at the rear of the rear end cover for introducing air and providing splash protection, a sealing gasket installed inside the hood body for sealing the connection between the rear end cover and the hood cylinder, and a dust filter installed inside the hood body for dust prevention.

[0013] Preferably, the first fan cover includes a cylindrical tube with its front end tightly fitted onto the rear end cover, an annular splash guard installed in the tube cavity, and an annular air inlet ring installed on the outer wall of the tube. Lugs corresponding to the screw holes are evenly distributed at the front end of the tube. A circular through hole aligned with the screw hole is formed on the lug, and the circular through hole is fastened to the screw hole by a screw. Air inlets for drawing in air are evenly distributed on the front part of the tube. Threads for connecting the second fan cover assembly are provided on the rear part of the tube. The splash guard has a concave cross-section. The circumferential wall of the front wing of the splash guard is welded to the cavity wall of the hood. A clamping cavity for installing the dust filter is provided between the circumferential wall of the rear wing of the splash guard and the cavity wall of the hood. The cavity of the air inlet is connected to the cavity of the splash guard. A notch for installing the dust filter is provided at the top of the rear wing of the splash guard. The air inlet ring has an L-shaped cross-section and is welded to the hood. The planar concave corner of the air inlet ring faces forward, and the air inlet is covered by the air inlet ring.

[0014] Preferably, the sealing gasket is sandwiched between the rear wall of the rear end cover and the front wing plate of the splash guard.

[0015] Preferably, the dust filter element includes a filter frame made of a metal mesh, which is circular in shape and has an L-shaped cross-section, and a locking block in the shape of a semi-circular disc. The locking block is integrally connected to the arc-shaped inner corner surface of the filter frame, and a clamping cavity is left between the locking block and the flat inner corner surface of the filter frame for locking onto the rear wing plate of the splash guard.

[0016] Preferably, the second hood assembly includes a second hood body installed at the rear of the first hood body for venting air, and a second dust filter installed on the rear cavity wall of the second hood body for dust prevention.

[0017] Preferably, the second hood includes a round cover with its opening threaded to the hood cylinder, and a cylindrical retaining post bonded to the cover cavity. The cover opening has a threaded groove for threading with the threaded section, and the rear wall of the cover has evenly spaced ventilation holes for airflow. The rear bottom surface of the retaining post is fixedly bonded to the middle of the rear cavity wall of the cover cavity.

[0018] Preferably, the second dust filter element includes a filter frame made of a metal mesh with an L-shaped cross-section, a circular plate-shaped anti-splash plate blocking the front of the ventilation hole, and a circular retaining ring with an annular cavity for inserting the retaining post. The rear wall surface of the anti-splash plate is bonded to the annular opening at the front of the second filter frame. The annular opening at the front of the retaining ring is bonded to the middle of the rear wall surface of the anti-splash plate.

[0019] A waterproofing method, applicable to the aforementioned waterproofing device for an electric motor, includes the following waterproofing methods:

[0020] Method 1: The connection between the rear end cover and the shroud is sealed with a sealing gasket to prevent water from outside the motor from splashing into the inner cavity of the shroud from the connection between the rear end cover and the shroud, thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan installed thereon.

[0021] Method 2: The cover opening and the tube body at the rear of the cover cylinder are connected by a tight thread to prevent water from the outside of the motor from splashing into the inner cavity of the fan cover from the connection between the cover and the cover cylinder, thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan installed thereon.

[0022] Method 3: Water from outside the motor splashes into the inner cavity of the fan shroud through the air inlet. It is then intercepted by the splash guard and drips down along the groove under gravity. The water then flows out of the inner cavity of the fan shroud through the air inlet on the bottom tube of the shroud, thus preventing water from splashing onto the rear shaft end of the motor rotor and the fan on which it is installed.

[0023] Method 4: Water from outside the motor splashes into the inner cavity of the shroud through the ventilation holes in the cover. It is then intercepted by the splash guard and the second filter frame. Under the action of gravity, it drips down along the plate of the splash guard and the frame of the second filter frame, and flows out of the inner cavity of the shroud through the air inlet on the tube at the bottom of the shroud. This prevents water from splashing onto the rear shaft end of the motor rotor and the fan installed thereon.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] I. The fan of this invention uses spiral blades and creates a negative pressure zone in front of the fan, allowing air from outside the motor to rush into the negative pressure zone through the air inlet, thereby accelerating the airflow outside the motor and thus speeding up the heat dissipation of the motor casing, solving the problem of poor heat dissipation effect of traditional thrust-type heat dissipation methods.

[0026] II. By using the splash guard and dust filter in the first fan shroud assembly, this invention can prevent external water from splashing onto the fan through the air inlet and filter the air entering the inner cavity of the fan shroud. By using the second dust filter in the second fan shroud assembly, it can prevent external water from splashing onto the fan through the ventilation hole and filter the air entering the inner cavity of the fan shroud.

[0027] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a top view of the right front of the present invention;

[0030] Figure 2 This is a top view of the right rear of the present invention;

[0031] Figure 3 In this invention Figure 2 Exploded view of the structure;

[0032] Figure 4 This is a top view of the right front of the wind shield in this invention;

[0033] Figure 5 This is an exploded view of the structure of the wind shield assembly one in this invention;

[0034] Figure 6 This is a top view from the right front of the partially cut-out wind shield body in this invention.

[0035] Figure 7 In this invention Figure 6 Enlarged view of point A;

[0036] Figure 8 In this invention Figure 6 Enlarged view of point B;

[0037] Figure 9 This is a top view of the right front of the cover cylinder in this invention;

[0038] Figure 10 This is a top view of the right front of the sealing gasket in this invention, which has been partially cut out.

[0039] Figure 11 This is a top view from the right front of the dust filter element 1, which has been partially cut out in this invention.

[0040] Figure 12 This is an exploded view of the structure of the second wind shield assembly in this invention;

[0041] Figure 13 This is a top view from the right front of the partially cut-out wind shield body 2 in this invention;

[0042] Figure 14 This is a top view of the right front of the dust filter element two, which has been partially cut out in this invention;

[0043] Figure 15 This is a top view of the right rear of the dust filter element two in this invention;

[0044] Figure 16 This is a top view of the right front of the partially cut-out wind shield in this invention;

[0045] Figure 17 In this invention Figure 16 Enlarged view of point C;

[0046] Figure 18 In this invention Figure 16 Enlarged view of point D;

[0047] Figure 19 In this invention Figure 16 Enlarged view of point E;

[0048] Figure 20 This is a wind direction diagram for heat dissipation using the shroud in this invention;

[0049] Figure 21 In this invention Figure 20 Enlarged view of point F.

[0050] The attached diagram lists the components represented by each number as follows:

[0051] 01-Rear cover, 02-Fan, 1-Fan cover;

[0052] 100-Windshaft assembly one, 200-Windshaft assembly two;

[0053] 110-Wind cover body one, 111-Cover cylinder, 101-Air inlet hole, 112-Splash guard, 102-Notch one, 113-Air inlet ring;

[0054] 120 - Sealing gasket;

[0055] 130 - Dust filter component 1; 131 - Filter frame 1; 132 - Clip 1;

[0056] 210-Wind cover body two, 211-Cover, 212-Clamping post;

[0057] 220-Dust filter element two, 221-Filter frame two, 222-Splash guard, 223-Snap ring. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Example 1

[0060] Please see Figures 1-4 The present invention provides a waterproof device for an electric motor, comprising a self-ventilated electric motor whose rotor extends rearward to the rear of its rear end cover 01, wherein a fan 02 for cooling the electric motor is fixedly installed on the rear end of the rotor, and a fan cover 1 for covering the fan 02 is fixedly installed on the rear end cover 01 of the electric motor.

[0061] The motor body and its rear end cover 01 are fastened together with bolts. Screw holes for mounting the fan shroud 1 are evenly distributed on the circumferential side of the rear end cover 01. The fan blades of the fan 02 are spiral blades, made of thermally conductive metal, and capable of exchanging heat with the rotor of the motor. The fan shroud 1 adopts a modular design and is divided into two modules: fan shroud assembly one 100 and fan shroud assembly two 200.

[0062] Please see Figures 5-11 The hood assembly 100 provided by the present invention includes a hood body 110, a sealing gasket 120 and a dust filter element 130.

[0063] The hood body 110 includes a cylindrical hood 111, an annular splash guard 112, and an annular air inlet ring 113.

[0064] At the front end of the shroud 111, evenly distributed forward-extending lugs are integrally connected to the shroud 111. The number of lugs matches the number of screw holes on the circumferential side of the rear end cover 01. Each lug has a circular through hole aligned with the screw holes on the circumferential side of the rear end cover 01. The front section of the shroud 111 has circumferentially arrayed air inlets 101 for introducing air into the shroud cavity. The rear section of the shroud 111 has threads for connecting the second shroud assembly 200.

[0065] The splash guard 112 has a concave cross-section, and the diameter of the front wing plate of the splash guard 112 is larger than the diameter of the rear wing plate. The axis of the splash guard 112 is on the same straight line as the axis of the shroud 111. The circumferential wall of the front wing plate of the splash guard 112 is welded to the cavity wall of the shroud 111, and the front wing plate is located in front of the air inlet 101. The cavity of the air inlet 101 communicates with the cavity of the splash guard 112. A circular cavity is left between the circumferential wall of the rear wing plate of the splash guard 112 and the cavity wall of the shroud 111 for installing the dust filter element 130. In addition, a notch 102 is opened at the top of the rear wing plate of the splash guard 112 for installing the dust filter element 130.

[0066] The centerline of the air inlet ring 113 is on the same straight line as the centerline of the shroud 111. The groove cross-section of the air inlet ring 113 is L-shaped, and the air inlet ring 113 is welded to the shroud 111. The planar internal corner surface of the air inlet ring 113 faces forward, and the air inlet hole 101 is covered by the air inlet ring 113.

[0067] The sealing gasket 120 is a sealing rubber ring, and the centerline of the sealing gasket 120 is on the same straight line as the centerline of the splash groove 112. The cross-section of the sealing gasket 120 is an L-shaped cross-section, and the external corner surface formed by the front flange and the web of the splash groove 112 is covered by the internal corner surface of the sealing gasket 120.

[0068] The dust filter element 130 includes a ring-shaped filter frame 131 and a semi-circular disc-shaped locking block 132. The frame of the filter frame 131 is made of metal filter mesh. The axis of the filter frame 131 is on the same straight line as the axis of the splash guard 112. The frame of the filter frame 131 has an L-shaped cross-section, and the planar internal corner surface of the filter frame 131 faces forward. The locking block 132 is integrally connected to the arc-shaped internal corner surface of the filter frame 131, and the locking block 132 can be inserted into the cavity of the splash guard 112 through the notch 102. A clamping cavity is left between the locking block 132 and the planar internal corner surface of the filter frame 131 for locking onto the rear wing plate of the splash guard 112.

[0069] It is understood that the card block 132 is arc-shaped, the first side and the second side form the first filter frame 131, and its cross-section is L-shaped. The card block 132 is connected to the end face of the first side and is parallel to the second side. A clamping cavity is provided on the connection surface between the card block 132 and the second side, and the opening direction of the clamping cavity is perpendicular to the plane where the first side is located.

[0070] In this invention, the tube opening at the front end of the cover 111 is tightly fitted onto the cover body at the rear end of the rear end cover 01. Then, the cover 111 is adjusted so that the notch 102 is positioned upwards, and the circular through hole of the lug connected to the cover 111 is aligned with the screw hole on the rear end cover 01. Then, the screw used to install the cover 111 is inserted into the circular through hole, and the screw is screwed into the screw hole aligned with the circular through hole. The screw is tightened so that the cover 111 is fixedly installed on the cover body at the rear end of the rear end cover 01.

[0071] In this invention, before the cover 111 is fixedly installed on the cover body at the rear of the rear end cover 01, the sealing gasket 120 is first installed in the cover 111 at the position where the sealing gasket 120 is placed. Thus, after the cover 111 is fixedly installed on the cover body at the rear of the rear end cover 01, the sealing gasket 120 is clamped between the rear wall of the rear end cover 01 and the front wing plate of the splash guard 112, so that the sealing gasket 120 seals the connection between the rear end cover 01 and the cover 111.

[0072] In this invention, no air inlet 101 is provided around the notch 102, so as to prevent external water from splashing into the anti-splash groove 112 through the cavity of the air inlet 101 and then flowing directly out of the anti-splash groove 112 through the notch 102, thereby preventing water from dripping onto the rear shaft end of the motor rotor and the fan 02 installed on the rear shaft end, so as to prevent water from corroding the rear shaft end of the rotor and the fan 02 installed on the rear shaft end.

[0073] In this invention, after the cover 111 is fixedly installed on the cover body at the rear of the rear end cover 01, the dust filter element 130 is installed in the cover 111 at the position where the dust filter element 130 is placed. The dust filter element 130 is installed by first inserting the filter frame 131 into the cavity of the cover 111 from the tube opening at the rear end of the cover 111, then rotating the filter frame 131 so that the locking block 132 is aligned with the notch 102, and pushing the locking block 132 from the notch 102 into the cavity of the splash guard 112, and rotating the filter frame 131 again so that the locking block 132 in the cavity of the splash guard 112 is misaligned with the notch 102, and the dust filter element 131 is installed in the cavity of the cover 111.

[0074] In this invention, before the filter frame 131 is inserted into the cavity of the shroud 111 from the port at the rear end of the shroud 111, the locking block 132 needs to be adjusted to face the shroud 111 before the filter frame 131 is inserted into the cavity of the shroud 111. After the dust filter element 131 is installed in the cavity of the shroud 111, the clamping cavity formed between the locking block 132 and the planar internal corner surface of the filter frame 131 is engaged with the plate of the rear wing plate of the splash guard 112. The planar internal corner surface of the filter frame 131 abuts against the rear wing plate of the splash guard 112, and the arc-shaped external corner surface of the filter frame 131 abuts against the cavity wall of the shroud 111.

[0075] Please see Figures 12-15 The hood assembly 200 provided by the present invention includes a hood body 210 and a dust filter 220.

[0076] The second type of hood 210 includes a dome-shaped cover 211 and a cylindrical retaining post 212, with the axis of the retaining post 212 and the axis of the cover 211 being on the same straight line. The opening of the cover 211 faces forward, and the opening of the cover 211 has a threaded groove for threading with the thread on the tube at the rear of the hood cylinder 111. The rear wall of the cover 211 has evenly spaced ventilation holes for air to be discharged. The retaining post 212 is a cylindrical rubber material, and its rear bottom surface is fixedly bonded to the rear cavity wall of the cover cavity of the cover 211.

[0077] The second dust filter element 220 includes a ring-shaped filter frame 221, a circular plate-shaped splash guard 222, and a ring-shaped retaining ring 223. The centerlines of the filter frame 221, the splash guard 222, and the retaining ring 223 are all on the same straight line. The frame of the filter frame 221 is made of metal mesh, and its cross-section is L-shaped, with the planar external corner facing rearward. The rear wall of the splash guard 222 is fixedly bonded to the annular opening at the front of the filter frame 221 to seal the opening. The annular opening at the front of the retaining ring 223 is fixedly bonded to the rear wall of the splash guard 222 to insert the retaining post 212.

[0078] In this invention, after installing the first shroud assembly 100 onto the cover at the rear of the rear end cover 01, the second shroud assembly 200 is then installed onto the first shroud assembly 100. The second shroud assembly 200 is installed by first inserting the retaining pin 212 into the annular cavity of the retaining ring 223, and then screwing the cover opening of the cover 211 onto the tube at the rear of the cover cylinder 111, thus completing the installation of the second shroud assembly 200.

[0079] In this invention, after the retaining pin 212 is tightly inserted into the annular cavity of the retaining ring 223, the planar external corner surface of the filter frame 221 abuts against the rear cavity wall of the cover 211, and the ventilation holes opened on the rear wall of the cover 211 are covered by the dust filter element 220. In addition, the circumference of the rear cavity wall of the cover 211 is arc-shaped to guide airflow.

[0080] Example 2

[0081] Please see Figures 16-21 Based on the waterproof device for an electric motor provided in Embodiment 1, the present invention also provides a waterproofing method, which includes the following waterproofing methods:

[0082] Method 1: The nozzle at the front end of the cover 111 is tightly fitted onto the cover body at the rear of the rear end cover 01, and the sealing gasket 120 is clamped between the rear wall of the rear end cover 01 and the front wing plate of the splash guard 112, so that the sealing gasket 120 seals the connection between the rear end cover 01 and the cover 111. In this way, water from outside the motor cannot splash into the inner cavity of the fan cover 1 through the connection between the rear end cover 01 and the cover 111, and thus cannot drip onto the rear shaft end of the motor rotor covered by the fan cover 1 and the fan 02 installed on the rear shaft end, thereby avoiding corrosion of the rear shaft end of the motor rotor and the fan 02 installed on the rear shaft end by water.

[0083] Method 2: The threaded groove at the opening of the cover 211 is tightly connected to the threaded section on the tube at the rear of the cover 111, and the cover 211 is screwed onto the tube at the rear of the cover 111. In this way, water from outside the motor cannot splash into the inner cavity of the fan cover 1 through the connection between the cover 211 and the cover 111, and thus cannot drip onto the rear shaft end of the motor rotor covered by the fan cover 1 and the fan 02 installed on the rear shaft end, thereby preventing water from corroding the rear shaft end of the motor rotor and the fan 02 installed on the rear shaft end.

[0084] Method 3: Water from outside the motor splashes into the inner cavity of the shroud 1 through the air inlet 101. It is then intercepted by the splash guard 112 and, under gravity, drips down along the groove of the splash guard 112 to the bottom wall of the shroud cylinder 111. It then flows out of the inner cavity of the shroud 1 through the air inlet 101 located on the bottom of the shroud cylinder 111. This prevents the water splashed into the inner cavity of the shroud 1 from dripping onto the rear shaft end of the motor rotor covered by the shroud 1 and the fan 02 mounted on that rear shaft end, thus avoiding corrosion of the rear shaft end of the motor rotor and the fan 02 mounted on that rear shaft end.

[0085] Method 4: Water from outside the motor splashes into the inner cavity of the shroud 1 through the ventilation holes on the rear wall of the cover 211. It is then intercepted by the splash guard 222 and the filter frame 221, and under gravity, drips down along the plate of the splash guard 222 and the frame of the filter frame 221 to the bottom wall of the cover cavity of the cover 211. It then flows to the bottom wall of the shroud cylinder 111 and exits the inner cavity of the shroud 1 through the air inlet 101 located on the bottom tube of the shroud cylinder 111. This prevents water from splashing into the inner cavity of the shroud 1 onto the rear shaft end of the motor rotor covered by the shroud 1 and the fan 02 mounted on that rear shaft end, thus avoiding corrosion of the rear shaft end of the motor rotor and the fan 02 mounted on that rear shaft end.

[0086] In this invention, when the rotor of the electric motor rotates, it drives the fan 02 mounted on the rear shaft end of the rotor to rotate. The fan 02 pushes the air in front of it towards the rear cavity wall of the cover 211. The air pushed to the rear cavity wall of the cover 211 is guided by the arc surface of the rear cavity wall to the filter frame 221, and enters the space behind the splash guard 222 through the filter holes of the filter frame 221. Finally, it is discharged from the inner cavity of the shroud 1 through the ventilation holes opened in the rear wall of the cover 211. The heat on the rotor of the electric motor is transferred to the fan 02 mounted on the rear shaft end of the rotor. When the air in front of the fan 02 is pushed towards the rear cavity wall of the cover 211 by the fan 02, this air carries away the heat of the fan 02, thereby achieving the purpose of cooling the electric motor.

[0087] In this invention, when the rotor of the electric motor rotates, it drives the fan 02 mounted on the rear shaft end of the rotor to rotate. The fan 02 pushes the air in front of it towards the rear cavity wall of the cover cavity of the cover 211, creating a negative pressure zone in front of the fan 02. This allows air from outside the electric motor to enter the cavity of the splash guard 112 through the air inlet 101 and flow through the filter holes of the filter frame 131 to the negative pressure zone in front of the fan 02. When the air from outside the electric motor rushes into the inner cavity of the fan cover 1 through the air inlet 101, it accelerates the flow of air from outside the electric motor. This flowing air contacts the outer wall of the electric motor and carries away the heat from the motor casing, thereby achieving the purpose of cooling the electric motor. Among them, the air around the heat dissipation fins of the electric motor, under the influence of the heat dissipation fins and the air inlet ring 113, flows along the heat dissipation fins towards the inner corner cavity of the air inlet ring 113 and enters the fan cover 1 through the air inlet 101. In addition, if it is necessary to change the direction of rotation of the motor rotor, in order to ensure that the fan 02 installed at the rear shaft end of the rotor can dissipate heat properly, the fan 02 needs to be removed and a spiral fan is selected and installed at the rear shaft end of the rotor, and the direction of rotation of the spiral fan blades is opposite to that of the fan 02 blades.

[0088] In this invention, dust in the air outside the fan shroud 1 is blocked by filter frame 131 and filter frame 221, which helps reduce the amount of dust entering the inner cavity of the fan shroud 1, thus preventing excessive dust from adhering to the fan blades of the fan 02 and affecting their heat dissipation. Regularly checking the dust accumulation on the fan blades, filter frame 131, and filter frame 221 and cleaning them facilitates the entry of air from outside the motor into the inner cavity of the fan shroud 1 and the exhaust of air from the inner cavity of the fan shroud 1, and also helps with the heat dissipation of the fan blades. When it is necessary to check the dust accumulation on the fan blades, filter frame 131, and filter frame 221, simply unscrew the cover 211 from the tube at the rear end of the cover cylinder 111 to observe the dust accumulation on the fan blades, filter frame 131, and filter frame 221. By observing the dust accumulation, if it is necessary to clean the filter frame 131 and filter frame 221, first remove the filter frame 131 and filter frame 221, and then use the dust cleaning tool to clean the filter frame 131 and filter frame 221; if it is necessary to clean the fan blades of fan 02, the dust cleaning tool can be used directly to clean the fan blades, or the cover 111 can be removed from the rear cover 01 first, and then the dust cleaning tool can be used to clean the fan blades.

[0089] In the foregoing, exemplary embodiments of the proposed solution of the present invention have been described in detail with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A waterproof device for electric motor comprising a self-fan cooled electric motor with a rear end cover (01), a fan (02) and a fan cover (1), characterized in that: The wind shield (1) includes a wind shield assembly one (100) installed at the rear of the rear end cover (01) and a wind shield assembly two (200) installed at the rear of the wind shield assembly one (100). The hood assembly (100) includes a hood body (110) installed at the rear of the rear end cover (01) for introducing air and providing splash protection, a sealing gasket (120) installed inside the hood body (110) for sealing the connection between the rear end cover (01) and the hood cylinder (111), and a dust filter (130) installed inside the hood body (110) for dust prevention. The rear end cover (01) has screw holes evenly provided on its circumferential side for installing the wind cover body (110). The fan (02) is installed behind the rear end cover (01), the fan blades of the fan (02) are spiral fan blades, and the material of the fan (02) is thermally conductive metal; The wind shield cover (110) includes a cylindrical tube (111) with its front end tightly fitted onto the rear cover of the rear end cover (01), an annular splash guard (112) installed in the cavity of the tube (111), and an annular air inlet ring (113) installed on the outer wall of the tube (111). The front end of the cover (111) is uniformly provided with ear blocks corresponding to the screw holes of the rear end cover (01). The ear blocks are provided with circular through holes aligned with the screw holes, and the circular through holes are fastened to the screw holes by screws. The front part of the cover (111) is uniformly provided with air inlet holes (101) for drawing in air, and the rear part of the cover (111) is provided with threads for threading the second fan cover body (210). The air outside the motor enters the cavity of the splash guard (112) through the air inlet hole (101) and flows to the front of the fan (02) through the filter holes of the first filter frame (131) to form a negative pressure zone. The splash guard (112) has a concave cross-section. The circumferential wall of the front wing plate of the splash guard (112) is welded to the cavity wall of the cover (111). A clamping cavity for installing the dust filter component (130) is left between the circumferential wall of the rear wing plate of the splash guard (112) and the cavity wall of the cover (111). A notch (102) for installing the dust filter component (130) is opened at the top of the rear wing plate of the splash guard (112). The cavity of the air inlet (101) is connected to the cavity of the splash guard (112). The groove of the air inlet ring (113) has an L-shaped cross section, and the air inlet ring (113) is welded to the cover (111). The planar internal corner of the air inlet ring (113) faces forward, and the air inlet hole (101) is covered by the air inlet ring (113). The second hood assembly (200) includes a second hood body (210) installed at the rear of the first hood body (110) for venting air, and a second dust filter (220) installed at the rear cavity wall of the second hood body (210) for dust prevention.

2. A waterproofing arrangement for an electric motor according to claim 1, characterised in that: The sealing gasket (120) is sandwiched between the rear wall of the rear end cover (01) and the front wing plate of the splash guard (112).

3. A waterproofing arrangement for an electric motor according to claim 1, characterised in that: The dust filter element (130) includes a filter frame (131) made of a metal mesh in a circular shape with an L-shaped cross section and a locking block (132) in a semi-circular shape. The first locking block (132) is integrally connected to the arc-shaped inner corner surface of the first filter frame (131), and there is a clamping cavity between the first locking block (132) and the plane-shaped inner corner surface of the first filter frame (131) for locking onto the rear wing plate of the splash guard (112).

4. A waterproofing arrangement for an electric motor according to claim 1, characterised in that: The second wind shield (210) includes a cover (211) that is round and whose opening is threaded to the cover cylinder (111) and a cylindrical retaining post (212) that is glued to the cover cavity of the cover (211).

5. A waterproofing arrangement for an electric motor according to claim 4, characterised in that: The cover (211) has a threaded groove at the opening for threading with the thread on the tube body at the rear of the cover (111), and the rear wall of the cover (211) is evenly provided with ventilation holes for air to be discharged. The rear bottom surface of the locking post (212) is fixedly bonded to the middle of the rear cavity wall of the cover cavity (211).

6. A waterproof device for an electric motor according to claim 5, characterized in that: The second dust filter (220) includes a filter frame (221) made of metal mesh with an annular cross section of L-shaped cross section, a splash guard (222) in the shape of a circular plate that shields the ventilation hole opened in the cover (211), and a retaining ring (223) in the shape of an annular cavity for inserting the retaining post (212). The rear wall of the splash guard (222) is bonded to the annular opening at the front of the filter frame (221); The annular opening at the front of the retaining ring (223) is bonded to the middle of the rear wall surface of the splash guard (222).

7. A waterproofing method applicable to a waterproofing device for an electric motor according to claim 6, characterized in that, Including the following waterproofing methods: Method 1: The connection between the rear end cover (01) and the cover (111) is sealed by a sealing gasket (120) to prevent water from outside the motor from splashing into the inner cavity of the fan cover (1) from the connection between the rear end cover (01) and the cover (111), thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan (02) installed thereon. Method 2: The cover (211) and the tube at the rear of the cover (111) are connected by a tight thread to prevent water from the outside of the motor from splashing into the inner cavity of the fan cover (1) from the connection between the cover (211) and the cover (111), thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan (02) installed thereon. Method 3: Water from outside the motor splashes into the inner cavity of the fan cover (1) through the air inlet (101), is intercepted by the splash guard (112), and then drips down along the groove of the splash guard (112) under the action of gravity, and flows out of the inner cavity of the fan cover (1) through the air inlet (101) on the bottom tube of the cover (111), thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan (02) installed thereon. Method 4: Water from outside the motor splashes into the inner cavity of the shroud (1) through the ventilation holes in the cover (211). It is then intercepted by the splash guard (222) and the second filter frame (221). Under the action of gravity, it drips down along the plate of the splash guard (222) and the frame of the second filter frame (221), and flows out of the inner cavity of the shroud (1) through the air inlet (101) on the bottom tube of the shroud (111), thereby preventing water from splashing onto the rear shaft end of the motor rotor and the fan (02) installed thereon.

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