Waterproof structure of motor for rotorcraft

Abstract

The invention relates to the technical field of brushless motors, in particular to a waterproof structure of a motor for a rotorcraft, which comprises a base, a rotor assembly, a stator assembly, an insertion ring, a water absorption expansion piece and a sealing piece, the base is provided with a center hole and a first annular groove, and the first annular groove is provided with a ventilation hole; the rotor assembly comprises a front cover, and the front cover is provided with a containing cavity and an air opening. The stator assembly is arranged in the containing cavity, the insertion ring is arranged in the first annular groove in a lifting mode, the insertion ring is provided with a circulation channel communicated with the air opening and is close to the front cover, the water absorption expansion part is arranged on the base and abuts against the insertion ring, and when the water absorption expansion part absorbs water to expand, the insertion ring moves in the direction away from the air opening; according to the motor, when it rains, the water absorption expansion part expands, the insertion ring moves downwards, the sealing part seals the air opening under the action of centrifugal force, and the advantages that the stator iron core and the coil are not exposed, and heat dissipation and water prevention are achieved at the same time are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of brushless motors, and more specifically to a waterproof structure of a motor for a rotorcraft. Background Art

[0002] Brushless motors are widely used in rotorcraft. Currently, the main components of a brushless motor are the rotor, armature, and base. Bearings are mounted on the base, which plays an important role in supporting the rotor's rotation. In practical applications, when brushless motors are used in dusty and rainy environments, their internal bearings are susceptible to corrosion, significantly shortening the bearing's lifespan, and thus the lifespan of the brushless motor.

[0003] Patent document CN214480015U discloses a waterproof structure for a brushless motor. The structure includes a front cover with an annular inner retaining ring on its lower surface. The inner retaining ring is located outside the base, with a gap between the inner retaining ring and the base. The lower end of the inner retaining ring extends to the side of the base. The inner retaining ring and the front cover together cover the top of the base. The inner retaining ring reduces the risk of rainwater passing through the inner retaining ring and seeping into the bearing. However, to ensure heat dissipation, the front cover has many hollow areas. Although the coils on the stator core are insulated with enameled wire, the long-term exposure of the coils may affect their service life.

[0004] Therefore, there is a need to provide a waterproof structure for a rotorcraft motor that does not leak the stator core and coil and has both heat dissipation and waterproofing. Summary of the Invention

[0005] The main purpose of the present application is to provide a waterproof structure for a motor for a rotorcraft, wherein the waterproof structure for the motor for a rotorcraft includes a base, a rotor assembly, a stator assembly, an insert ring, several water-absorbing expansion members and several closing members, the base having a center hole and a first annular groove located outside the center hole, the bottom wall of the first annular groove having several ventilation holes; the rotor assembly includes a front cover, a main shaft and a rotor core, the main shaft passes through the front cover and the center hole and is rotatably mounted on the base, the front cover is fixedly connected to the main shaft, the front cover has a accommodating cavity, the rotor core is placed on the cavity wall of the accommodating cavity, and the front cover has several air outlets; the stator assembly is placed in the accommodating cavity and is located on the inner side of the rotor core, the stator assembly includes a stator core and a coil, the stator core is sleeved on the base, and the coil is wound on the stator core; the insert ring can be lifted and lowered In the first annular groove, the insert ring has a circulation channel running through it, one end of the insert ring is close to the front cover, and the circulation channel is connected to each of the air outlets; the water absorption expansion member is provided at one end of the base close to the air outlet and abuts against the insert ring, and when the water absorption expansion member absorbs water and expands, the insert ring moves in a direction away from the air outlet; the closing member corresponds to the air outlet one by one, and the closing member is slidably arranged in the circumference of the front cover. When the front cover rotates circumferentially, the closing member slides in a direction away from the main axis and abuts against or closes the corresponding air outlet on the inner wall of the insert ring. Under normal circumstances, the air outlet, the circulation channel of the insert ring and the ventilation hole form a ventilation channel to facilitate heat dissipation. When it rains, the water absorption expansion member expands and the insert ring moves downward, and the closing member closes the air outlet under the action of centrifugal force to prevent rainwater from entering the accommodating cavity. Compared with the existing technology, it has the advantages of not leaking the stator core and coil, and both heat dissipation and waterproofing.

[0006] Another object of the present application is to provide a waterproof structure for a motor for a rotorcraft, wherein the waterproof structure for the motor for a rotorcraft also includes a rotor assembly, the closure member abuts against the inner wall of the insert ring through the rotor assembly, the rotor assembly includes a sealing shaft, a first rotating shaft and a second rotating shaft, the closure member has a through hole, one end of the sealing shaft extends into the through hole and is fixedly connected to the closure member, and the sealing shaft closes the through hole, the first rotating shaft is sleeved on the end of the sealing shaft away from the accommodating cavity, the side wall of the first rotating shaft has a plurality of rotor blades, the second rotating shaft is sleeved on the end of the sealing shaft close to the accommodating cavity, and the second rotating shaft is sleeved on the end of the sealing shaft close to the accommodating cavity. The side wall of the shaft has a plurality of air inlet blades, and a circular ring is fixedly connected to the outer side of the air inlet blade, a first magnetic ring is provided at the bottom of the first rotating shaft, and a second magnetic ring is provided at the top of the second rotating shaft, the first magnetic ring and the second magnetic ring are magnetically coupled, the closing part has a first liquid flow hole, the center hole is provided with a guide cavity at one end close to the front cover, and the base also has a second liquid flow hole at both ends extending to the guide cavity and the circulation channel respectively, when the insert ring is close to the air outlet, the circular ring rolls in contact with the inner wall of the insert ring, and the inflowing rainwater is used to drive the rotor blades to rotate, so that the air inlet blades blow air to the water absorption expansion part, and at the same time, water flows into the circulation channel of the insert ring to realize liquid cooling.

[0007] In order to achieve at least one of the above-mentioned invention objectives, the present application provides a waterproof structure for a motor for a rotorcraft, wherein the waterproof structure for the motor for a rotorcraft comprises: A base having a central hole and a first annular groove located outside the central hole, wherein a bottom wall of the first annular groove has a plurality of ventilation holes; A rotor assembly, comprising a front cover, a main shaft, and a rotor core. The main shaft passes through the front cover and the center hole and is rotatably mounted on the base. The front cover is fixedly connected to the main shaft. The front cover has an accommodating cavity. The rotor core is placed on the cavity wall of the accommodating cavity. The front cover has a plurality of air vents. a stator assembly, the stator assembly being placed in the accommodating cavity and located inside the rotor core, the stator assembly comprising a stator core and a coil, the stator core being sleeved on the base, and the coil being wound on the stator core; an insert ring, the insert ring being movably disposed in the first annular groove, the insert ring having a circulation passage therethrough, one end of the insert ring being close to the front cover, and the circulation passage being in communication with each of the air vents; A plurality of water-absorbing expansion members, each of which is provided at one end of the base close to the air outlet and abuts against the insert ring. When the water-absorbing expansion member absorbs water and expands, the insert ring moves away from the air outlet; A plurality of closing parts, each corresponding to the air outlet, are slidably arranged on the circumference of the front cover. When the front cover rotates circumferentially, the closing parts slide in a direction away from the main axis and abut against or close the corresponding air outlet against the inner wall of the insert ring.

[0008] In one or more embodiments of the present application, the waterproof structure of the rotorcraft motor also includes a rotor assembly, the closure member abuts against the inner wall of the insert ring through the rotor assembly, the rotor assembly includes a sealing shaft, a first rotating shaft and a second rotating shaft, the closure member has a through hole, one end of the sealing shaft extends into the through hole and is fixedly connected to the closure member, and the sealing shaft closes the through hole, the first rotating shaft is sleeved on the end of the sealing shaft away from the accommodating cavity, the side wall of the first rotating shaft has a plurality of rotor blades, and the second rotating shaft is sleeved on the sealing shaft Near one end of the accommodating cavity, the side wall of the second rotating shaft has a plurality of air inlet blades, and the outer side of the air inlet blade is fixedly connected to a circular ring, the bottom of the first rotating shaft is provided with a first magnetic ring, and the top of the second rotating shaft is provided with a second magnetic ring, the first magnetic ring and the second magnetic ring are magnetically coupled, the closing member has a first liquid flow hole, the end of the center hole near the front cover is provided with a guide cavity, the base also has a second liquid flow hole with two ends extending to the guide cavity and the circulation channel respectively, when the insert ring is close to the air outlet, the circular ring rolls in contact with the inner wall of the insert ring.

[0009] In one or more embodiments of the present application, the front cover has a plurality of slide grooves, the closing piece is slidably arranged in the slide grooves, and the waterproof structure of the rotorcraft motor also includes a block, which is slidably arranged at one end of the slide groove away from the closing piece. When the circular ring contacts the inner wall of the insert ring, the closing piece and the block are respectively located on the inner and outer sides of the insert ring.

[0010] In one or more embodiments of the present application, the waterproof structure of the rotorcraft motor further includes a plurality of heat-conducting rods, the heat-conducting rods passing through the base, and the two ends of the heat-conducting rods respectively abut against the stator core and the insert ring.

[0011] In one or more embodiments of the present application, the front cover has a plurality of notches at one end facing away from the stator assembly, and the waterproof structure of the rotorcraft motor also includes a plurality of heat dissipating fins and a heat dissipating ring. The heat dissipating ring is fixedly connected to the bottom wall of the accommodating cavity, one end of the heat dissipating fin extends into the notch, and the other end of the heat dissipating fin passes through the front cover and is connected to the top surface of the heat dissipating ring. The heat dissipating fin is fixedly connected to the front cover, and the projection of the heat dissipating fin along the axial direction of the main shaft is located on the outside of the stator core.

[0012] In one or more embodiments of the present application, the rotor assembly also includes two semicircular rear covers, and the end of the base facing away from the front cover has a second annular groove. The two semicircular rear covers are fixedly connected to the front cover, and the inner side of the semicircular rear cover extends into the second annular groove.

[0013] In one or more embodiments of the present application, the waterproof structure of the rotorcraft motor also includes a pressure relief assembly, the pressure relief assembly includes a lifting column and a fourth elastic member, the semicircular rear cover has a lifting hole, the lifting column is lifted and lowered in the lifting hole, the lifting column has an air inlet channel and an air outlet hole, the air inlet channel is connected to the accommodating cavity, and when the fourth elastic member is in an undeformed state, the opening of the air outlet hole is closed by the hole wall of the lifting hole.

[0014] In an embodiment of the present application, a waterproof structure of a motor for a rotorcraft includes a base, a rotor assembly, a stator assembly, an insert ring, several water-absorbing expansion parts and several closing parts. The base has a center hole and a first annular groove located outside the center hole, and the bottom wall of the first annular groove has several ventilation holes; the rotor assembly includes a front cover, a main shaft and a rotor core. The main shaft passes through the front cover and the center hole and is rotatably installed on the base. The front cover is fixedly connected to the main shaft. The front cover has a accommodating cavity. The rotor core is placed on the cavity wall of the accommodating cavity. The front cover has several air outlets; the stator assembly is placed in the accommodating cavity and is located on the inner side of the rotor core. The stator assembly includes a stator core and a coil. The stator core is sleeved on the base, and the coil is wound on the stator core; the insert ring can be lifted and lowered in the first annular groove. The insert ring has a through-hole. The circulation channel is passed through, and one end of the insert ring is close to the front cover, and the circulation channel is connected to each air outlet; the water absorption expansion member is provided at one end of the base close to the air outlet and abuts against the insert ring. When the water absorption expansion member absorbs water and expands, the insert ring moves away from the air outlet; the closing member corresponds to the air outlet one by one, and the closing member is slidably arranged on the circumference of the front cover. When the front cover rotates circumferentially, the closing member slides in the direction away from the main axis and abuts against the inner wall of the insert ring or closes the corresponding air outlet. Under normal circumstances, the air outlet, the circulation channel of the insert ring and the ventilation hole form a ventilation channel to facilitate heat dissipation. When it rains, the water absorption expansion member is expanded and the insert ring is moved downward, and the closing member closes the air outlet under the action of centrifugal force to prevent rainwater from entering the accommodating cavity. Compared with the existing technology, it has the advantages of not leaking the stator core and coil, and both heat dissipation and waterproofing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] These and / or other aspects and advantages of the present application will become more clear and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which: Figure 1 FIG2 shows a cross-sectional view of a waterproof structure of a motor for a rotorcraft according to the present application; Figure 2 Pictured Figure 1A local enlarged view of point C; Figure 3 Pictured Figure 2 A local enlarged view of point D; Figure 4 Pictured Figure 1 A local enlarged view of point E. DETAILED DESCRIPTION

[0016] The terms and words used in the following description and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.

[0017] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0018] Although ordinal numbers such as "first," "second," and the like will be used to describe various components, these are not intended to limit those components. The terms are used solely to distinguish one component from another. For example, a first component could be referred to as a second component, and similarly, a second component could be referred to as a first component without departing from the teachings of the inventive concept. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0019] The terms used herein are for the purpose of describing various embodiments only and are not intended to be limiting. As used herein, the singular is intended to include the plural, unless the context clearly indicates otherwise. It will also be understood that the terms "comprising" and / or "having" when used in this specification specify the presence of a stated feature, number, step, operation, component, element, or combination thereof, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.

[0020] Schematic diagram of the waterproof structure of the rotorcraft motor, reference Figures 1 to 4 According to a preferred embodiment of the present invention, a waterproof structure of a motor for a rotorcraft includes a base 10, a rotor assembly 20, and a stator assembly 30.

[0021] Specifically, if Figure 1As shown, the base 10 has a center hole 101, and the rotor assembly 20 includes a front cover 201, a main shaft 202 and a rotor core 203. The main shaft 202 passes through the front cover 201 and the center hole 101 and is rotatably mounted on the base 10 by a bearing placed in the center hole 101. The front cover 201 is fixedly connected to the main shaft 202. The front cover 201 has a receiving cavity 2011, and the rotor core 203 is placed on the cavity wall of the receiving cavity 2011. The stator assembly 30 is placed in the receiving cavity 2011 and is located on the inner side of the rotor core 203. The stator assembly 30 includes a stator core 301 and a coil 302. The stator core 301 is sleeved on the base 10, and the coil 302 is wound on the stator core 301.

[0022] It should be noted that when the coil 302 is energized, the front cover 201 and the main shaft 202 rotate synchronously around the central axis of the main shaft 202 in the circumferential direction; in addition, the main shaft 202 is equipped with a rotor.

[0023] Furthermore, since the coil 302 generates heat after being energized, and the heat is transferred to the stator core 301, the base 10 and the air in the accommodating cavity 2011, in order to improve the heat dissipation, Figure 1 and Figure 2 As shown, the base 10 also has a first annular groove 102 located outside the center hole 101, and the bottom wall of the first annular groove 102 has a plurality of ventilation holes 103. The front cover 201 has a plurality of air outlets 2012. The waterproof structure of the rotorcraft motor also includes an insert ring 40, which can be lifted and lowered in the first annular groove 102. The insert ring 40 has a penetrating flow channel 401. The inner and outer parts of the insert ring 40 are connected by a plurality of ribs with holes. One end of the insert ring 40 is close to the front cover 201, and the flow channel 401 is connected to each of the air outlets 2012.

[0024] It should be noted that under normal circumstances, external air can pass through the ventilation holes 103, the circulation channel 401 of the insert ring 40, and the air inlet 2012, and carry away heat transferred to the outside of the front cover 201. Furthermore, while the insert ring 40 is normally close to the air inlet 2012, a slight gap still exists between the top of the insert ring 40 and the air inlet 2012, allowing for air circulation between the accommodating cavity 2011 and the air inlet 2012. If a sudden downpour occurs during flight of the rotorcraft, rainwater can easily flow along the air inlet 2012 into the circulation channel 401 of the insert ring 40 and be discharged from the ventilation holes 103. However, due to the slight gap between the top of the insert ring 40 and the air inlet 2012, some rainwater may seep toward the inner and outer walls of the insert ring 40.

[0025] In view of this, if Figure 2 As shown, the waterproof structure of the rotorcraft motor also includes a plurality of water-absorbing expansion members 402, a plurality of closing members 50, a first elastic member and a second elastic member. The water-absorbing expansion member 402 is provided at one end of the base 10 close to the air outlet 2012 and abuts against the insert ring 40. When the water-absorbing expansion member 402 absorbs water and expands, the insert ring 40 moves away from the air outlet 2012; the closing member 50 corresponds to the air outlet 2012 one by one, and the closing member 50 is slidably provided in the circumference of the front cover 201. When the front cover 201 rotates circumferentially, the closing member 50 slides in the direction away from the main shaft 202 and abuts against or closes the corresponding air outlet 2012 with the inner wall of the insert ring 40. The two ends of the first elastic member are respectively connected to the insert ring 40 and the base 10, and the two ends of the second elastic member are respectively connected to the closing member 50 and the front cover 201. By arranging the first elastic member and the second elastic member, the insert ring 40 is normally close to the air outlet 2012, and the closing member 50 is normally located on the inner side of the insert ring 40. The material of the water-absorbing and expanding member 402 includes but is not limited to water-absorbing and expanding rubber or highly absorbent resin.

[0026] It should be noted that, when the rotorcraft is in motion, that is, the front cover 201 rotates circumferentially, the closing member 50 is subjected to a centrifugal force and slides toward the outside of the front cover 201. However, when it is not raining outside, since the insert ring 40 is close to the air outlet 2012, the closing member 50 no longer slides outward after contacting the inner wall of the insert ring 40, that is, at this time, the air outlet 2012 is still connected to the flow channel 401 of the insert ring 40; when a part of the rainwater seeps toward the inner and outer walls of the insert ring 40, the rainwater contacts the water-absorbing expansion member 402, and the water-absorbing expansion member 402 expands in volume after absorbing water, and since the end of the water-absorbing expansion member 402 close to the air outlet 2012 is subjected to Due to the restriction of the seat body, the water-absorbing expansion member 402 expands downward and causes the insert ring 40 to be subjected to a downward force. This force overcomes the elastic force of the first elastic member, causing the insert ring 40 to move downward a predetermined distance and move the insert ring 40 away from the air outlet 2012. As the insert ring 40 withdraws, the insert ring 40 no longer blocks the closing member 50 from sliding toward the outside of the front cover 201. The closing member 50 overcomes the elastic force of the second elastic member under the action of centrifugal force and slides outward and closes the air outlet 2012, thereby preventing external rainwater from seeping into the accommodating cavity 2011 along the air outlet 2012, and effectively avoiding the risk of the stator core 301, the coil 302 and the bearing being corroded by rainwater. At this time, although the air vent 2012 is closed and the sealing of the accommodating chamber 2011 becomes stronger, which is not conducive to heat dissipation, due to the continuous rain outside, the rainwater will carry away the heat transferred to the front cover 201 after contacting the front cover 201, thereby extending the service life of the rotorcraft in the external rainy environment. It should also be pointed out that when the rotorcraft stops, the front cover 201 no longer rotates circumferentially, and the closing member 50 will be reset to the initial position under the elastic force of the second elastic member and will no longer close the air vent 2012. When the water-absorbing expansion member 402 dries and shrinks, the insert ring 40 will move upward under the elastic force of the first elastic member and approach the air vent 2012 again. It is obvious that compared with the prior art, the present application has the advantages of not leaking the stator core and coil, and having both heat dissipation and waterproofing.

[0027] Furthermore, if Figure 2 and Figure 3As shown, the waterproof structure of the rotorcraft motor also includes a rotor assembly 60, the closure 50 is against the inner wall of the insert ring 40 through the rotor assembly 60, the rotor assembly 60 includes a sealing shaft 601, a first rotating shaft 602 and a second rotating shaft 603, the closure 50 has a through hole, one end of the sealing shaft 601 extends into the through hole and is fixedly connected to the closure 50, and the sealing shaft 601 closes the through hole, the first rotating shaft 602 is sleeved on the end of the sealing shaft 601 away from the accommodating cavity 2011, the side wall of the first rotating shaft 602 has a plurality of rotor blades 6021, the second rotating shaft 603 is sleeved on the end of the sealing shaft 601 close to the accommodating cavity 2011, the first rotating shaft 602 is sleeved on the end of the sealing shaft 601 close to the accommodating cavity 2011, and the second rotating shaft 603 is sleeved on the end of the sealing shaft 601 close to the accommodating cavity 2011. The side walls of the second rotating shaft 603 have a plurality of air inlet blades 6031, and a circular ring 6032 is fixedly connected to the outer side of the air inlet blade 6031. A first magnetic ring 6022 is fixedly provided at the bottom of the first rotating shaft 602, and a second magnetic ring is fixedly provided at the top of the second rotating shaft 603. The first magnetic ring 6022 is magnetically coupled with the second magnetic ring. The closure 50 has a first liquid flow hole 501, and a guide cavity 104 is provided at one end of the center hole 101 close to the front cover 201. The base 10 also has a second liquid flow hole 105 with two ends extending to the guide cavity 104 and the circulation channel 401 respectively. When the insert ring 40 is close to the air outlet 2012, the circular ring 6032 rolls in contact with the inner wall of the insert ring 40.

[0028] It should be noted that when the closure member 50 closes the air outlet 2012, the two ends of the first liquid flow hole 501 are connected to the air outlet 2012 and the guide cavity 104 respectively. After the external rainwater flows into the air outlet 2012, it flows along the upper surface of the closure member 50 to the rotor blade 6021, and drives the rotor blade 6021 and the first rotating shaft 602 to rotate circumferentially. Since the first rotating shaft 602 is magnetically coupled with the second rotating shaft 603, the second rotating shaft 603 follows the circumferential rotation. Since the insert ring 40 is away from the air outlet 2012 at this time due to the volume expansion of the water absorption expansion member 402, the flow gap between the accommodating cavity 2011 and the air inlet blade 6031 becomes larger. Therefore, when the second rotating shaft 603 rotates circumferentially, the air inlet blade 6 031 rotates circumferentially, creating a negative pressure zone on the side of the air inlet blade 6031 near the air outlet 2012. This accelerates the flow of higher-temperature air within the accommodating chamber 2011 into this negative pressure zone, where it passes through the air inlet blade 6031 and blows toward the water-absorbing expansion member 402, accelerating the drying of the water-absorbing expansion member 402. It should also be noted that at this time, because the sealing member 50 seals the air outlet 2012, even if the water-absorbing expansion member 402 becomes partially dried by the higher-temperature air and causes the insert ring 40 to move upward under the elastic force of the first elastic member, the insert ring 40 will be prevented from moving further upward by the sealing member 50. At the same time, the insert ring 40 can also provide upward pressure on the sealing member 50, forcing it to fit more closely to the front cover 201. Furthermore, rainwater flows along the first liquid flow hole 501 into the guide cavity 104 and the second liquid flow hole 105, cooling the flow channel 401 of the insert ring 40. In addition, in order to prevent rainwater from flowing into the accommodating chamber 2011 along the through hole of the closure 50, the present application connects the first rotating shaft 602 and the second rotating shaft 603 by magnetic coupling, and after the sealing shaft 601 passes through the through hole, it is connected to the hole wall of the through hole by welding or gluing, and closes the gap between the side wall of the sealing shaft 601 and the hole wall of the through hole, thereby ensuring the sealing performance and realizing that when the first rotating shaft 602 rotates circumferentially, the second rotating shaft 603 follows the circumferential rotation, and vice versa. Under normal circumstances, that is, when it is not raining, during the circumferential rotation of the front cover 201, the ring 6032 rolls relative to the inner wall of the insert ring 40, thereby driving the first rotating shaft 602 and the rotor blade 6021 to rotate circumferentially. The circumferential rotation of the rotor blade 6021 will also generate a negative pressure area and promote the inflow of external air.

[0029] Furthermore, in order to avoid the gap between the insert ring 40 and the air outlet 2012 being too large under normal conditions, Figure 2As shown, the front cover 201 has a plurality of slide grooves 2013, and the closing member 50 is slidably disposed in the slide grooves 2013. The waterproof structure of the rotorcraft motor also includes a stopper 2014 and a third elastic member. The stopper 2014 is slidably disposed at the end of the slide groove 2013 away from the closing member 50. The two ends of the third elastic member are respectively connected to the third elastic member and the front cover 201. When the circular ring 6032 contacts the inner wall of the insert ring 40, the closing member 50 and the stopper 2014 are respectively located on the inner and outer sides of the insert ring 40. Under normal conditions, the third elastic member causes the stopper 2014 to approach the insert ring 40. It should be noted that when the closing member 50 closes the air outlet 2012 under the action of centrifugal force, the closing member 50 applies a thrust to the stopper 2014, causing it to move in a direction away from the closing member 50.

[0030] Furthermore, in order to facilitate the heat transfer from the stator core 301 to the insert ring 40, as shown in FIG. Figure 1 As shown, the waterproof structure of the rotorcraft motor further includes a plurality of heat-conducting rods 105 . The heat-conducting rods 105 pass through the base 10 , and both ends of the heat-conducting rods 105 abut against the stator core 301 and the insert ring 40 , respectively.

[0031] Furthermore, since the heat conducting rod 105 can more easily transfer the temperature inside the stator core 301 to the insert ring 40, in order to improve the heat dissipation outside the stator core 301, as shown in FIG. Figure 1 As shown, the front cover 201 has a plurality of notches at one end facing away from the stator assembly 30. The waterproof structure of the rotorcraft motor also includes a plurality of heat dissipation fins 106 and a heat dissipation ring 107. The heat dissipation ring 107 is fixedly connected to the bottom wall of the accommodating cavity 2011. One end of the heat dissipation fin 106 extends into the notch, and the other end of the heat dissipation fin 106 passes through the front cover 201 and is connected to the top surface of the heat dissipation ring 107. The heat dissipation fin 106 is fixedly connected to the front cover 201. The projection of the heat dissipation fin 106 along the axial direction of the main shaft 202 is located on the outside of the stator core 301.

[0032] To further improve the waterproofness, Figure 1As shown, the rotor assembly 20 further includes two semicircular rear covers 204. The end of the base 10 facing away from the front cover 201 has a second annular groove 108. The two semicircular rear covers 204 are fixedly connected to the front cover 201, and the inner sides of the semicircular rear covers 204 extend into the second annular groove 108. It should be noted that during installation, the two semicircular rear covers 204 are first inserted into the second annular groove 108, and then the semicircular rear covers 204 are fixedly connected to the front cover 201. In addition, the semicircular rear covers 204 and the second annular groove 108 form an effect similar to a labyrinth seal.

[0033] Furthermore, in order to prevent the air in the accommodating cavity 2011 from becoming too hot and damaging the stator core 301 and the coil 302, Figure 1 and Figure 4 As shown, the waterproof structure of the rotorcraft motor further includes a pressure relief assembly 205, which includes a lifting column 2051 and a fourth elastic member. The semicircular rear cover 204 has a lifting hole, and the lifting column 2051 is arranged to be lifted and lowered within the lifting hole. The lifting column 2051 has an air inlet channel and an air outlet 2052. The air inlet channel is connected to the accommodating chamber 2011. When the fourth elastic member is in an undeformed state, the opening of the air outlet 2052 is sealed by the wall of the lifting hole. When the air pressure in the accommodating chamber 2011 exceeds a predetermined value, the lifting column 2051 moves downward a predetermined distance under the action of the air pressure, and the air in the accommodating chamber 2011 can be discharged through the air outlet 2052, thereby reducing the air pressure in the accommodating chamber 2011.

[0034] Furthermore, if Figure 1 As shown, the waterproof structure of the rotorcraft motor further includes a sealing cover 60 , which is connected to the base 10 and closes the central hole 101 .

[0035] In summary, the waterproof structure of the rotorcraft motor according to the embodiment of the present application is explained, which provides the advantages of preventing the stator core and coil from leaking out, and achieving both heat dissipation and waterproofing.

[0036] It is worth mentioning that in the embodiments of the present application, the waterproof structure of the rotorcraft motor is simple in structure, does not involve complex manufacturing processes and expensive materials, and is highly economical. Furthermore, for manufacturers, the waterproof structure of the rotorcraft motor provided in the present application is easy to produce and is low in cost, which is more conducive to controlling production costs and further promoting product promotion and use.

[0037] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from these principles.

Claims

1. A waterproof structure for a motor for a rotorcraft, characterized by: The waterproof structure of the motor for the rotorcraft includes: A base having a central hole and a first annular groove located outside the central hole, wherein a bottom wall of the first annular groove has a plurality of ventilation holes; A rotor assembly, comprising a front cover, a main shaft, and a rotor core. The main shaft passes through the front cover and the center hole and is rotatably mounted on the base. The front cover is fixedly connected to the main shaft. The front cover has an accommodating cavity. The rotor core is placed on the cavity wall of the accommodating cavity. The front cover has a plurality of air vents. a stator assembly, the stator assembly being placed in the accommodating cavity and located inside the rotor core, the stator assembly comprising a stator core and a coil, the stator core being sleeved on the base, and the coil being wound on the stator core; an insert ring, the insert ring being movably disposed in the first annular groove, the insert ring having a circulation passage therethrough, one end of the insert ring being close to the front cover, and the circulation passage being in communication with each of the air vents; A plurality of water-absorbing expansion members, each of which is provided at one end of the base close to the air outlet and abuts against the insert ring. When the water-absorbing expansion member absorbs water and expands, the insert ring moves away from the air outlet; A plurality of closing parts, each corresponding to the air outlet, are slidably arranged on the circumference of the front cover. When the front cover rotates circumferentially, the closing parts slide in a direction away from the main axis and abut against or close the corresponding air outlet against the inner wall of the insert ring.

2. The waterproof structure of a rotorcraft motor according to claim 1, characterized in that: The waterproof structure of the motor for the rotorcraft also includes a rotor assembly, the closure member abuts against the inner wall of the insert ring through the rotor assembly, the rotor assembly includes a sealing shaft, a first rotating shaft and a second rotating shaft, the closure member has a through hole, one end of the sealing shaft extends into the through hole and is fixedly connected to the closure member, and the sealing shaft closes the through hole, the first rotating shaft is sleeved on the end of the sealing shaft away from the accommodating cavity, the side wall of the first rotating shaft has a plurality of rotor blades, and the second rotating shaft is sleeved on the sealing shaft close to the accommodating cavity One end of the first rotating shaft, the side wall of the second rotating shaft has a plurality of air inlet blades, and the outer side of the air inlet blade is fixedly connected to a circular ring, the bottom of the first rotating shaft is provided with a first magnetic ring, the top of the second rotating shaft is provided with a second magnetic ring, the first magnetic ring and the second magnetic ring are magnetically coupled, the closure has a first flow hole, the end of the center hole close to the front cover is provided with a guide cavity, the base further has a second flow hole extending at both ends to the guide cavity and the circulation channel respectively, when the insert ring is close to the air outlet, the circular ring rolls in contact with the inner wall of the insert ring.

3. The waterproof structure of the rotorcraft motor according to claim 2, characterized in that: The front cover has a plurality of slide grooves, and the closing piece is slidably arranged in the slide grooves. The waterproof structure of the rotorcraft motor also includes a block, and the block is slidably arranged at one end of the slide groove away from the closing piece. When the circular ring contacts the inner wall of the insert ring, the closing piece and the block are respectively located on the inner and outer sides of the insert ring.

4. The waterproof structure of a rotorcraft motor according to claim 3, characterized in that: The waterproof structure of the rotorcraft motor further includes a plurality of heat-conducting rods, which pass through the base, and the two ends of the heat-conducting rods respectively abut against the stator core and the insert ring.

5. The waterproof structure of the motor for a rotorcraft according to claim 4, characterized in that: The front cover has a plurality of notches at one end facing away from the stator assembly. The waterproof structure of the rotorcraft motor also includes a plurality of heat dissipation fins and a heat dissipation ring. The heat dissipation ring is fixedly connected to the bottom wall of the accommodating cavity. One end of the heat dissipation fin extends into the notch, and the other end of the heat dissipation fin passes through the front cover and is connected to the top surface of the heat dissipation ring. The heat dissipation fin is fixedly connected to the front cover. The projection of the heat dissipation fin along the axial direction of the main shaft is located on the outside of the stator core.

6. The waterproof structure of a motor for a rotorcraft according to claim 3, characterized in that: The rotor assembly also includes two semicircular rear covers. The end of the base facing away from the front cover has a second annular groove. The two semicircular rear covers are fixedly connected to the front cover, and the inner sides of the semicircular rear covers extend into the second annular groove.

7. The waterproof structure of a motor for a rotorcraft according to claim 6, characterized in that: The waterproof structure of the rotorcraft motor also includes a pressure relief assembly, which includes a lifting column and a fourth elastic member. The semicircular rear cover is provided with a lifting hole, and the lifting column is lifted and lowered in the lifting hole. The lifting column has an air inlet channel and an air outlet hole, and the air inlet channel is connected to the accommodating cavity. When the fourth elastic member is in an undeformed state, the opening of the air outlet hole is closed by the hole wall of the lifting hole.

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