An end cap assembly and electric machine

Abstract

The application provides an end cover assembly and a motor. The end cover assembly comprises an end cover body, a rotating shaft and a sheath. The rotating shaft is arranged in the end cover body and has a shaft extension section which extends out of the end cover body. The sheath is arranged on the shaft extension section. The first end of the sheath is detachably connected with the end cover body. The second end of the sheath extends along the axial direction of the shaft extension section. The outer wall surface of the sheath is provided with an external drainage groove. The external drainage groove guides the fluid falling on the end cover body to the shaft extension section. Since the outer wall surface of the sheath is provided with the external drainage groove, the water and the silt will flow along the external drainage groove under the action of gravity, so that the water and the silt will not accumulate on the end cover body, thereby avoiding the water and the silt from entering the inside of the motor.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to an end cover assembly and an electric machine. BACKGROUND

[0002] Different electric machine application fields are different, and different use environments are also different, and the requirements for waterproof and dustproof of electric machines are also different. In the application environment, the use environment of some electric machines is relatively harsh, and there are often cases of splashing water and mud. The current processing method is generally to increase an oil seal structure outside the bearing of the electric machine to prevent water and mud from splashing, but since the mud is a solid small particle, if it adheres to the rotor shaft or partially enters between the rotor shaft and the oil seal, after a long time of wear, the shaft is easily worn, resulting in a gap between the shaft and the oil seal, causing the oil seal to fail. SUMMARY

[0003] The application provides an end cover assembly and an electric machine, which can solve the technical problem that water and mud adhere to the rotor shaft or enter between the rotor shaft and the oil seal, and after wear, the oil seal fails.

[0004] The application provides an end cover assembly, which comprises an end cover body, a rotating shaft and a sheath.

[0005] The rotating shaft is arranged in the end cover body, and the rotating shaft has a shaft extension section which extends out of the end cover body.

[0006] The sheath is arranged on the shaft extension section, a first end of the sheath is detachably connected to the end cover body, a second end of the sheath extends along the axial direction of the shaft extension section, and an outer wall surface of the sheath is provided with an external drainage groove, which guides the fluid falling on the end cover body to the shaft extension section.

[0007] In some embodiments, the outer wall surface of the sheath is a curved surface, and the diameter of the first end of the sheath is greater than the diameter of the second end of the sheath.

[0008] In some embodiments, the outer wall surface of the sheath is provided with a plurality of external drainage grooves, one end of each external drainage groove extends to the first end of the sheath, and the other end of each external drainage groove extends to the second end of the sheath.

[0009] In some embodiments, an internal drainage groove is formed in the sheath, one end of the internal drainage groove penetrates through the first end of the sheath and communicates with an oil seal chamber of the end cover body, and the other end of the internal drainage groove penetrates through the second end of the sheath.

[0010] In some embodiments, the sheath comprises a first shell and a second shell, the first shell is sleeved on the rotating shaft, the first shell is located radially inside the second shell; one end of the second shell is detachably connected with the end cover body, the other end of the second shell extends along the axial direction of the shaft extension section, a drainage gap is formed between the outer wall surface of the first shell and the inner wall surface of the second shell, and the drainage gap is in communication with the oil seal chamber of the end cover body.

[0011] In some embodiments, in a longitudinal section of the sheath as a projection plane, the wall surface of the first shell and the wall surface of the second shell are both curved surfaces.

[0012] In some embodiments, in the axial direction of the rotating shaft, the axial length of the first shell is greater than or equal to the axial length of the second shell; the radial length of the first shell and the second shell close to the end cover body is greater than the radial length of the first shell and the second shell away from the end cover body.

[0013] In some embodiments, the first end of the sheath is clamped with the end cover body.

[0014] In some embodiments, in some embodiments, the sheath is provided with an annular protrusion towards the end surface of the end cover body, the end surface of the end cover body is provided with an annular groove, and the annular protrusion is installed in the annular groove.

[0015] A motor comprises an end cover assembly, and the end cover assembly is the end cover assembly described above.

[0016] The end cover assembly and the motor provided by the application have the following beneficial effects:

[0017] When water and silt outside the motor splash on the end cover body, the outer wall surface of the sheath is provided with an external drainage groove, and the water and silt will flow along the external drainage groove under the action of gravity. The external drainage groove guides the water and silt to the second end of the sheath, that is, the direction away from the end cover body, so that the water and silt cannot accumulate on the end cover body, thereby avoiding the water and silt entering the inside of the motor. The drainage groove can prevent water from accumulating on the motor end cover body, reduce the erosion and damage of water to motor parts, and prolong the service life of the motor. The external drainage groove can intercept part of the dust and silt, which is discharged along the drainage groove, reducing the possibility of dust and silt entering the inside of the motor. The external drainage groove is relatively simple to set up, but can effectively realize the functions of drainage and dust prevention. Due to the existence of the external drainage groove, even if a small amount of water and silt enters the motor end cover part, it can also be smoothly discharged through the drainage groove, which is convenient for the maintenance and cleaning of the motor. The sheath and the end cover body are detachably connected to form a relatively closed space, which can effectively prevent dust, silt, water and other foreign matters from entering the inside of the motor. The outer wall surface of the sheath is provided with an external drainage groove, when water and silt fall on the end cover body, they will flow into the external drainage groove under the action of gravity, and then be guided to the second end of the sheath, that is, the direction away from the end cover body, preventing water and silt from entering the inside of the motor. The sheath is added outside the bearing of the motor, and the gap between the sheath and the rotating shaft is small, which can block the solid small particles such as silt from entering the bearing, avoid them from adhering to the rotor shaft or entering between the rotor shaft and the oil seal, reduce the wear and tear, and prolong the service life of the motor. The detachable connection mode of the sheath and the end cover body makes the maintenance of the motor more convenient. When it is necessary to check or replace the bearing and other parts, the sheath only needs to be disassembled, without the need to disassemble the entire end cover assembly, greatly reducing the maintenance time and labor intensity. Through the above synergistic effect, the protection performance and heat dissipation performance of the motor are significantly improved, the failures caused by the invasion of water and silt are reduced, and the damage caused by overheating is reduced, thereby prolonging the service life of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be derived from the provided drawings without creative labor.

[0019] Figure 1 It is a schematic view of the end cover assembly of the embodiment of the present application;

[0020] Figure 2 It is a schematic view of the sheath of the embodiment of the present application;

[0021] Figure 3 It is a sectional view of the sheath of the embodiment of the present application;

[0022] Figure 4 A schematic view of a drain gap of an embodiment of the present application;

[0023] Figure 5 A schematic view of a first housing of an embodiment of the present application;

[0024] Figure 6 A schematic view of a second housing of an embodiment of the present application;

[0025] Figure 7 A schematic view of an external drain groove of an embodiment of the present application;

[0026] Figure 8 A schematic view of an end cap body of an embodiment of the present application;

[0027] Figure 9 A schematic view of a sheath and end cap connection of an embodiment of the present application;

[0028] Figure 10 A schematic view of a drain path of an external drain groove of an embodiment of the present application.

[0029] FIG. 1 - end cap body; 101 - ring groove; 2 - rotating shaft; 3 - sheath; 31 - first housing; 32 - second housing; 301 - external drain groove; 303 - drain gap; 304 - annular protrusion; 4 - shaft extension section. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work, fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0032] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another element or feature as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. The terms "first", "second", "third", etc. do not necessarily signify order or importance, but are used to distinguish one element from another, and the terms "left", "right", "front", "back", "top", "bottom", "over", "under", and the like, are used in relation to the example of the figures as presented, and terms such as "anterior" and "posterior" are used in a relative sense only.

[0033] Reference will now be made to specific embodiments, examples of which are illustrated in the accompanying drawings. Understanding that the following Figures 1 to 10 As shown, according to the embodiment of the present application, a terminal cover assembly is provided, which comprises a terminal cover body 1, a rotating shaft 2 and a sheath 3, the rotating shaft 2 is arranged in the terminal cover body 1, the rotating shaft 2 has a shaft extension 4, the shaft extension 4 extends out of the terminal cover body 1; the sheath 3 is arranged on the shaft extension 4, a first end of the sheath 3 is detachably connected with the terminal cover body 1, a second end of the sheath 3 extends along the axial direction of the shaft extension 4, an outer wall surface of the sheath 3 is provided with an external drainage groove 301, the external drainage groove 301 guides the fluid falling on the terminal cover body 1 to the shaft extension 4.

[0034] Specifically, when the motor is started, the rotating shaft 2 rotates, the terminal cover body 1 and the sheath 3 remain stationary, the gap between the sheath 3 and the rotating shaft 2 is small, which blocks most of the water and sand from directly entering the inside of the motor. After the water and sand fall off the terminal cover body 1, the sheath 3 is connected with the terminal cover body 1, the outer wall of the sheath 3 is provided with the external drainage groove 301, the water and sand will flow into the external drainage groove 301 under the action of gravity, the second end of the sheath 3 extends along the axial direction of the shaft extension 4, the external drainage groove 301 guides the water and sand to the second end of the sheath 3, i.e. the direction away from the terminal cover body 1. Figure 10 At the second end of the sheath 3, the water and sand continue to fall under the action of gravity, the rotating shaft 2 is rotating, the water and sand falling off contact the rotating shaft 2, which are thrown to both sides under the action of centrifugal force, the water and sand will not flow back to the terminal cover body 1.

[0035] In this embodiment, when water and silt outside the motor splash on the end cover body 1, due to the outer wall surface of the sheath 3 is provided with an external drainage groove 301, water and silt will flow along the external drainage groove 301 under the action of gravity. The external drainage groove 301 guides the water and silt to the second end of the sheath 3, that is, away from the end cover body 1, so that the water and silt do not accumulate on the end cover body 1, thereby avoiding the water and silt into the motor interior, the drainage groove can prevent water accumulation on the motor end cover body 1, reduce the erosion and damage of water to the motor parts, prolong the service life of the motor. The external drainage groove 301 can intercept part of the dust and silt, so that it is discharged along the external drainage groove 301, reducing the possibility of dust and silt entering the motor interior. The setting of the external drainage groove 301 is relatively simple, but can effectively realize the functions of drainage and dust prevention. Due to the existence of the external drainage groove 301, even if a small amount of water and silt enters the motor end cover part, it can also be smoothly discharged through the drainage groove, facilitating the maintenance and cleaning of the motor. The sheath 3 and the end cover body 1 are detachably connected to form a relatively closed space, which can effectively prevent dust, silt, water and other foreign matters from entering the motor interior. The outer wall surface of the sheath 3 is provided with an external drainage groove 301, when water and silt fall on the end cover body 1, they will flow into the external drainage groove 301 under the action of gravity, thereby being guided to the second end of the sheath 3, that is, away from the end cover body 1, preventing water and silt from entering the motor interior. The sheath 3 is added outside the bearing of the motor, and the gap between the sheath 3 and the rotating shaft 2 is small, which can block the silt and other small solid particles from entering the bearing, avoid them from adhering to the rotor shaft or entering between the rotor shaft and the oil seal, reduce wear and tear, and prolong the service life of the motor. The detachable connection mode of the sheath 3 and the end cover body 1 makes the maintenance of the motor more convenient. When it is necessary to check or replace the bearing and other parts, the sheath 3 only needs to be disassembled, without the need to disassemble the entire end cover assembly, greatly reducing the maintenance time and labor intensity. Through the above synergistic effect, the protection performance and heat dissipation performance of the motor are significantly improved, the failures caused by water and silt invasion and the damage caused by overheating are reduced, thereby prolonging the service life of the motor.

[0036] In this embodiment, the end cover body 1 serves as the first line of defense for the motor, which can block most of the direct impact of water and silt, and the sheath 3 serves as the second line of defense, which is provided with an outer wall surface and a diameter change, so that water and silt are difficult to adhere and stay, further reducing the possibility of entering the motor interior. This multi-layer protection structure greatly improves the water and dust resistance of the motor. The detachable connection mode of the sheath 3 and the end cover body 1 makes the sealing between them more tight, so that even if a small amount of water and silt passes through the end cover body 1, the sheath 3 can effectively block it from further penetrating, ensuring the cleanliness of the motor interior.

[0037] For reference Figures 2 to 7As shown, the outer wall surface of the sheath 3 is curved, and the first end diameter of the sheath 3 is greater than the second end diameter of the sheath 3.

[0038] Specifically, the curved outer wall surface of the sheath 3 helps guide the flow of water and sediment along its surface. When water and sediment fall on the sheath 3, due to the guiding effect of the curved surface, they will flow along the curved surface to the second end of the sheath 3. Since the first end diameter of the sheath 3 is greater than the second end diameter, the water and sediment accelerate during the flow. When the water and sediment reach the second end of the sheath 3 and contact the rotating shaft 2, due to the centrifugal force generated by the rotation of the shaft 2, the water and sediment will be thrown to both sides of the shaft 2, thereby moving away from the end cover body 1 and the motor interior. On the outer wall surface of the sheath 3, the water and sediment naturally flow downward under the action of gravity, from the first end to the second end of the sheath 3, and finally leave the sheath 3.

[0039] In this embodiment, the curved outer wall surface of the sheath 3 helps guide the flow of water and sediment along its surface. When water and sediment fall on the sheath 3, due to the guiding effect of the curved surface, they will flow along the curved surface to the second end of the sheath 3. Since the first end diameter of the sheath 3 is greater than the second end diameter, this structure makes the water and sediment flow with a certain acceleration during the flow, improving the discharge efficiency. The small gap between the sheath 3 and the shaft 2 can effectively reduce the entry of small particles such as sediment into the shaft 2 and the oil seal, reduce the wear of the shaft 2 and the oil seal, prolong the service life of the motor, keep the motor interior clean and dry by effectively discharging water and sediment, maintain the normal operating performance of the motor, and improve the reliability of the motor. The outer wall surface of the sheath 3 is provided with an external drainage groove 301, which, in combination with the curved surface and the diameter change setting, can efficiently guide the flow of water and sediment to the second end of the sheath 3. The structure of the end cover body 1 also cooperates with the sheath 3, so that the water and sediment can smoothly flow from the end cover body 1 to the external drainage groove 301 of the sheath 3, avoiding accumulation on the end cover body 1. When the water and sediment reach the second end of the sheath 3 and contact the rotating shaft 2, the centrifugal force generated by the shaft 2 will throw the water and sediment to both sides, making them move away from the end cover body 1 and the motor interior. This centrifugal effect, combined with the drainage setting of the sheath 3, ensures that water and sediment will not flow back into the motor interior.

[0040] For reference Figures 2 to 7 As shown, the outer wall surface of the sheath 3 is provided with a plurality of external drainage grooves 301, one end of the external drainage groove 301 extends to the first end of the sheath 3, and the other end of the external drainage groove 301 extends to the second end of the sheath 3. It is preferred to set more than or equal to six external drainage grooves 301.

[0041] Specifically, when water and sand splashed from outside the motor onto the sheath 3, the water and sand will be collected into the external drainage grooves 301 due to the external wall surface of the sheath 3 being provided with a plurality of external drainage grooves 301, the extension direction of the drainage grooves being consistent with the axial direction of the sheath 3, extending from the first end to the second end, providing a clear flow path for the water and sand. The external drainage grooves 301 will guide the collected water and sand along the axial direction of the sheath 3 from the first end to the second end, due to the first end of the sheath 3 having a larger diameter than the second end, this structure causes the water and sand to be squeezed during the flow process, thereby accelerating the flow and improving the discharge efficiency. When the water and sand reach the second end of the sheath 3, due to the action of gravity and the centrifugal force generated by the rotating shaft 2, the water and sand will be thrown to both sides of the rotating shaft 2, thereby moving away from the end cover body 1 and the inside of the motor, achieving effective discharge.

[0042] In this embodiment, the provision of the external drainage grooves 301 increases the roughness of the surface of the sheath 3, which helps the attachment and flow of water and sand, at the same time, the extension direction of the drainage grooves is consistent with the axial direction of the sheath 3, so that the water and sand can be smoothly discharged and will not be retained on the surface of the sheath 3. The provision of a plurality of external drainage grooves 301 increases the flow channel of the water and sand, improves the drainage efficiency, even in harsh environments, such as heavy rain or sand splashing, the water and sand can be quickly discharged, ensuring the normal operation of the motor.

[0043] As a specific implementation (not shown in the figure), internal drainage grooves are provided in the sheath 3, one end of the internal drainage grooves penetrates the first end of the sheath 3 and communicates with the oil seal chamber of the end cover body 1, the other end of the internal drainage grooves penetrates the second end of the sheath 3.

[0044] Specifically, the accumulated water in the oil seal chamber (for example, due to a small amount of water seeping into the oil seal chamber) will be collected in the oil seal chamber, the accumulated water flows into the internal drainage grooves through one end of the internal drainage grooves (the part penetrating the first end of the sheath 3 and communicating with the oil seal chamber), the accumulated water flows along the internal drainage grooves from the first end to the second end of the sheath 3, the accumulated water is discharged from the sheath 3 through the other end of the internal drainage grooves (penetrating the second end of the sheath 3), and finally leaves the motor. After the water and sand splashed from outside onto the external wall surface of the sheath 3 are collected by the external drainage grooves 301, the water and sand flow along the external drainage grooves 301 from the first end to the second end of the sheath 3, the water and sand are discharged from the sheath 3 through the other end of the external drainage grooves 301, and finally leave the motor. When the water and sand reach the second end of the sheath 3 and come into contact with the rotating shaft 2, the centrifugal force generated by the rotating shaft 2 will throw the water and sand to both sides, causing them to move away from the end cover body 1 and the inside of the motor, the accumulated water in the oil seal chamber is discharged through the internal drainage grooves, the water and sand splashed from outside are discharged through the external drainage grooves 301, all the discharged water and sand finally leave the motor under the combined action of gravity and centrifugal force, ensuring the dryness and cleanliness of the inside of the motor.

[0045] In the present embodiment, the internal drainage groove communicates the oil seal chamber with the outside of the sheath 3, when there is water in the oil seal chamber, the water can flow out through the internal drainage groove, avoiding accumulation in the oil seal chamber, if the accumulated water stays in the oil seal chamber for a long time, it is easy to cause the oil seal to age and deform, thereby reducing the sealing effect, making it easier for water and sediment to enter the motor interior. By timely draining the accumulated water through the internal drainage groove, it can effectively prevent such a situation from occurring, maintaining the good sealing performance of the oil seal. The internal drainage groove and the external drainage groove 301 work together to form a double drainage system, the external drainage groove 301 is mainly responsible for draining the water and sediment that falls on the outer wall of the sheath 3, while the internal drainage groove is responsible for draining the accumulated water in the oil seal chamber, the two work together to ensure that the motor will not be damaged by water and sediment at different parts, when the water in the oil seal chamber is drained through the internal drainage groove, if the water contacts the rotating shaft 2, it will be thrown to both sides under the action of centrifugal force, thereby far away from the end cover body 1 and the motor interior, further preventing water from entering the motor interior. The internal drainage groove is relatively simple to set up, but it can effectively achieve the function of draining water, due to the existence of the internal drainage groove, even if a small amount of water enters the oil seal chamber, it can also be smoothly drained through the drainage groove, facilitating the maintenance and cleaning of the motor. By effectively draining the accumulated water in the oil seal chamber, preventing water and sediment from entering the motor interior, protecting the internal parts of the motor from damage, maintaining the normal operating performance of the motor, reducing the damage caused by the invasion of water and sediment, and the damage caused by overheating or pressure imbalance, thereby prolonging the service life of the motor.

[0046] For reference Figures 2 to 7 As shown in the figure, the sheath 3 includes a first shell 31 and a second shell 32, the first shell 31 is sleeved on the shaft 2, and the first shell 31 is located on the radially inner side of the second shell 32; one end of the second shell 32 is detachably connected with the end cover body 1, and the other end of the second shell 32 extends along the axial direction of the shaft extension section 4, the water drainage gap 303 is formed between the outer wall surface of the first shell 31 and the inner wall surface of the second shell 32, the water drainage gap 303 communicates with the oil seal chamber of the end cover body 1, and the size of the water drainage gap 303 is within the range of 0.3-0.5mm.

[0047] Specifically, the accumulated water (e.g., due to a small amount of water seeping into the oil seal chamber) in the oil seal chamber is collected in the oil seal chamber, flows into the drainage gap 303 through one end (the part close to the end cover body 1) of the drainage gap 303, and flows along the drainage gap 303 from the end cover body 1 to the second end of the sheath 3. Since the first shell 31 rotates with the rotating shaft 2, while the second shell 32 does not rotate, the drainage gap 303 rotates and forms an air film, the accumulated water in the drainage gap 303 is subjected to a certain centrifugal force, the airflow hits the helical angle, the entire airflow direction is outward, accelerating its flow to the second end of the sheath 3, and the accumulated water is discharged from the second end of the sheath 3 and finally leaves the motor. After the external water and mud splashes onto the outer wall surface of the sheath 3 (i.e., the outer wall surface of the second shell 32), it is collected by the external drainage groove 301, and the water and mud flow along the external drainage groove 301 from the first end to the second end of the sheath 3, and are discharged from the other end (the second end of the sheath 3) of the external drainage groove 301 and finally leave the motor. When the water and mud reach the second end of the sheath 3 and contact the rotating rotating shaft 2, the centrifugal force generated by the rotating shaft 2 throws the water and mud to both sides, away from the end cover body 1 and the inside of the motor. The accumulated water in the oil seal chamber is discharged through the drainage gap 303, and the external water and mud are discharged through the external drainage groove 301. All the discharged water and mud finally leave the motor under the joint action of gravity and centrifugal force, ensuring the dryness and cleanliness of the inside of the motor.

[0048] In this embodiment, the accumulated water in the oil seal chamber is discharged through the drainage gap 303, avoiding the accumulation of water in the chamber, preventing the oil seal from aging and deforming due to long-term contact with water, thereby reducing the sealing effect and ensuring the reliable operation of the oil seal. The external water and mud are collected by the external drainage groove 301 and discharged to the second end of the sheath 3 to prevent them from entering the inside of the motor. The first shell 31 rotates with the rotating shaft 2, and the accumulated water in the drainage gap 303 is subjected to a centrifugal force, accelerating its flow to the second end of the sheath 3 and being discharged, thereby improving the drainage efficiency. The drainage gap 303 is in communication with the oil seal chamber, which can discharge the accumulated water in the oil seal chamber in time, reducing the risk of water and mud entering the inside of the motor, protecting internal components such as bearings and windings, and avoiding motor failure caused by the entry of foreign matter. The scheme of this embodiment can realize the drainage function through the drainage gap 303 between the first shell 31 and the second shell 32, compared to the internal drainage groove in the sheath 3, which has a simple structure and is easy to manufacture and assemble. Through effective drainage and protection, the motor failure caused by the invasion of water and mud is reduced, the reliability of the motor in harsh environments is improved, and the service life of the motor is prolonged.

[0049] As a specific implementation, in order to accelerate the discharge of water and mud, an internal drainage groove can also be provided on the first shell 31 or the second shell 32, i.e., the drainage of the oil seal chamber is realized under the joint action of the internal drainage groove and the drainage gap 303.

[0050] As a specific embodiment, the outer wall surface of the first shell 31 is a curved surface and is provided with a spiral groove. Different lead and pitch ratios are set according to the rotational speed. When the rotational speed is low, a larger lead is required to increase the exhaust volume. When the rotational speed is low, the lead can be reduced.

[0051] See also Figures 2 to 7 As shown, taking the longitudinal section of the sheath 3 as the projection surface, the wall surface of the first shell 31 and the wall surface of the second shell 32 are both curved surfaces.

[0052] In this embodiment, the first shell 31 rotates with the rotating shaft 2, and a dynamic drainage gap 303 is formed between its curved wall and the curved wall of the second shell 32. Under the action of centrifugal force, the accumulated water is thrown to the second end of the sheath 3 and discharged. At the same time, the curved wall guides the accumulated water to flow smoothly, improving the drainage efficiency. The fitting setting of the curved wall reduces the path for water and sediment to enter the interior of the motor, thereby enhancing the sealing effect. Even under dynamic conditions, it can effectively prevent the intrusion of foreign matter. The curved wall can effectively block the intrusion of external water and sediment, reduce the risk of damage to the internal components of the motor, prevent the accumulation of accumulated water on the surface and inside of the shell, reduce corrosion, and extend the service life of the motor. The curved surface setting reduces the accumulation of accumulated water and dirt, making the sheath 3 easier to clean and reducing the difficulty of maintenance.

[0053] See also Figures 2 to 7 As shown, in the axial direction of the rotating shaft 2, the axial length of the first shell 31 is greater than or equal to the axial length of the second shell 32; the radial length of the first shell 31 and the second shell 32 close to the end cover body 1 is greater than the radial length of the first shell 31 and the second shell 32 away from the end cover body 1.

[0054] In the present embodiment, the first shell 31 is longer in the axial direction, which can more effectively cover the rotating shaft 2 and provide more comprehensive protection for the rotating shaft 2, preventing water and sand from entering the motor from the axial direction. The radial length near the side of the end cover body 1 is larger, which can better fit the end cover body 1 and form a tighter seal, preventing water and sand from entering the motor from the radial direction. The axial length of the first shell 31 is greater than or equal to the second shell 32, so that the drainage gap 303 has sufficient length in the axial direction, which is conducive to the smooth flow of accumulated water from the end cover body 1 to the second end of the sheath 3 along the drainage gap 303 and then discharged. The larger radial length near the side of the end cover body 1 helps to guide the accumulated water to enter the drainage gap 303 more quickly, while preventing the accumulation of water near the end cover body 1. The longer axial length can provide better support, reduce vibration and shaking of the rotating shaft 2 during rotation, and improve the stability of the motor operation. The larger radial length near the side of the end cover body 1 can enhance the connection strength of the sheath 3 and the end cover body 1, making the sheath 3 more stable during motor operation. The present embodiment enhances the protection performance and optimizes the drainage effect, reducing the opportunity for water and sand and other foreign matter to enter the motor, thereby reducing the wear of internal components, prolonging the service life of the motor, preventing water and sand from accumulating in the motor, reducing the possibility of corrosion, and further improving the reliability and durability of the motor.

[0055] As a specific implementation, whether it is the sheath 3 or when the sheath 3 includes the first shell 31 and the second shell 32, the structure is in the shape of a horn, that is, the first end is large in diameter and the other end is small in diameter.

[0056] For reference Figures 1 to 10 As shown, the first end of the sheath 3 is clamped with the end cover body 1.

[0057] In this embodiment, the clamping connection between the protective sleeve 3 and the end cover body 1 is stable and reliable, even if the motor is running in a vibrating and impacting environment, the protective sleeve 3 is not easy to loosen or fall off, the clamping structure limits the relative displacement between the protective sleeve 3 and the end cover body 1, ensures the position accuracy of the two during the motor operation, thereby improving the stability and reliability of the entire motor system. The clamping structure usually has good sealing performance, can form a sealing barrier between the protective sleeve 3 and the end cover body 1, effectively prevent water, sand and other foreign matters from invading the motor interior from the connection, enhance the protection performance of the motor, cooperate with other sealing structures (such as oil seal, etc.) on the end cover body 1, further improve the sealing effect of the motor, provide more reliable protection for the operation of the motor in harsh environment. The clamping connection makes the protective sleeve 3 and the end cover body 1 become a whole, enhances the rigidity of the overall structure of the motor, improves the anti-deformation ability of the motor, helps to maintain the operation accuracy and performance of the motor, the clamping structure can disperse the stress between the protective sleeve 3 and the end cover body 1 to a larger contact area, avoid the structure damage caused by excessive local stress, prolong the service life of the protective sleeve 3 and the end cover body 1.

[0058] For reference Figures 1 to 10 As shown in the figure, the end face of the protective sleeve 3 towards the end cover body 1 is provided with an annular protrusion 304, and the end face of the end cover body 1 is provided with an annular groove 101. Specifically, the end face of the second shell 32 towards the end cover body 1 is provided with an annular protrusion 304, and the annular protrusion 304 is installed in the annular groove 101.

[0059] In this embodiment, the annular protrusion 304 of the protective sleeve 3 is installed in the annular groove 101 of the end cover body 1, which can form an effective sealing barrier to prevent water, sand and other foreign matters from invading the motor interior from the gap between the protective sleeve 3 and the end cover body 1, and protect the internal components of the motor. The cooperation of the annular protrusion 304 and the annular groove 101 has better sealing performance than the simple plane contact, can adapt to certain mechanical vibration and temperature change, and ensures the long-term reliability of the sealing effect. The cooperation of the annular protrusion 304 and the annular groove 101 provides accurate positioning for the installation of the protective sleeve 3, ensures the accurate connection between the protective sleeve 3 and the end cover body 1, and avoids the deviation or skew of the protective sleeve 3 during the installation process. This structure makes the installation process of the protective sleeve 3 more simple and fast, only needs to align the annular protrusion 304 with the annular groove 101 and insert it, without complex alignment and adjustment steps. The cooperation of the annular protrusion 304 and the annular groove 101 limits the relative movement between the protective sleeve 3 and the end cover body 1, ensures the stability of the connection between them, even if the motor is running in a vibrating and impacting environment, the protective sleeve 3 is not easy to loosen or fall off. This connection method makes the protective sleeve 3 and the end cover body 1 become a whole, enhances the stability of the overall structure of the motor, improves the anti-deformation ability of the motor, and helps to maintain the operation accuracy and performance of the motor.

[0060] For a more complete understanding of the application, reference is made to the following description taken in connection with the accompanying drawings in which: Figures 1 to 10 Referring to the drawings, a motor includes an end cap assembly, the end cap assembly being the end cap assembly described above.

[0061] It is readily apparent to those skilled in the art that the advantageous features described above can be freely combined, superposed, etc. without contradiction.

[0062] The above description is only preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above is only the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be considered as the protection scope of the present application.

Claims

1. An end cap assembly, characterized by, The end cover assembly comprises an end cover body (1), a rotating shaft (2) and a sheath (3). The rotating shaft (2) is arranged in the end cover body (1), and the rotating shaft (2) has a shaft extension section (4) extending out of the end cover body (1). The sheath (3) is arranged on the shaft extension section (4), a first end of the sheath (3) is detachably connected with the end cover body (1), a second end of the sheath (3) extends along an axial direction of the shaft extension section (4), and an outer wall surface of the sheath (3) is provided with an external drainage groove (301) for guiding fluid falling on the end cover body (1) to the shaft extension section (4). The sheath (3) comprises a first shell (31) and a second shell (32), the first shell (31) is arranged on the rotating shaft (2), and the first shell (31) is located on a radially inner side of the second shell (32); one end of the second shell (32) is detachably connected with the end cover body (1), and the other end of the second shell (32) extends along the axial direction of the shaft extension section (4); an outer wall surface of the first shell (31) and an inner wall surface of the second shell (32) form a drainage gap (303), and the drainage gap (303) is in communication with an oil seal chamber of the end cover body (1). An outer wall surface of the second shell (32) is provided with a plurality of external drainage grooves (301), one end of each of the external drainage grooves (301) extends towards the first end of the sheath (3), and the other end of each of the external drainage grooves (301) extends towards the second end of the sheath (3). An annular protrusion (304) is arranged on an end surface of the second shell (32) facing the end cover body (1), and an annular groove (101) is arranged on an end surface of the end cover body (1), and the annular protrusion (304) is arranged in the annular groove (101). An outer wall surface of the sheath (3) is a curved surface, and a diameter of the first end of the sheath (3) is greater than a diameter of the second end of the sheath (3).

2. The end cap assembly of claim 1, wherein, An internal drainage groove is arranged in the sheath (3), one end of the internal drainage groove penetrates through the first end of the sheath (3) and is in communication with the oil seal chamber of the end cover body (1), and the other end of the internal drainage groove penetrates through the second end of the sheath (3).

3. The end cap assembly of claim 1, wherein, In a longitudinal section of the sheath (3), a wall surface of the first shell (31) and a wall surface of the second shell (32) are both curved surfaces.

4. The end cap assembly of claim 1, wherein, In an axial direction of the rotating shaft (2), an axial length of the first shell (31) is greater than or equal to an axial length of the second shell (32); and a radial length of the first shell (31) and the second shell (32) close to the end cover body (1) is greater than a radial length of the first shell (31) and the second shell (32) away from the end cover body (1).

5. The end cap assembly of claim 4, wherein, The end cover assembly is the end cover assembly according to any one of claims 1 to 5.

6. An electrical machine comprising an end cap assembly, characterized in that, ​

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