Electric motor and underwater robot

Abstract

This application discloses an electric motor and an underwater robot, relating to the field of electric motor technology. The electric motor includes a housing, a rotor, a stator, a shaft, and a column. The housing has a first accommodating cavity and a first opening. The rotor is disposed inside the first accommodating cavity and has a second accommodating cavity and a second opening, the second opening having an opposite opening direction to the first opening. At least a portion of the stator is disposed inside the second accommodating cavity. The shaft passes through the second accommodating cavity and is fixedly connected to the rotor to drive the rotor to rotate. The column is disposed inside the second accommodating cavity, sleeved on the shaft, and positioned between the shaft and the stator, and is closely connected to the stator to receive heat generated by the stator. One end of the column is connected to the housing to conduct the heat generated by the stator to the housing. This application can directly conduct the heat generated by the stator to the housing for heat dissipation, improving the heat dissipation efficiency of the stator as a heat source.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to an electric motor and an underwater robot. Background Technology

[0002] Underwater external rotor motors typically use water that enters directly into the motor's interior for cooling. However, prolonged use underwater can lead to corrosion of the motor.

[0003] In the prior art, the problem of motor corrosion is improved by adding an outer casing to the external rotor motor. However, the inventors found that adding an outer casing to the external rotor motor results in low efficiency of heat transfer between the heat source and the casing through the air, causing the motor to be unable to operate at high power.

[0004] The content of the background section is merely technology known to the public and does not necessarily represent existing technology in the field. Summary of the Invention

[0005] This application aims to provide an electric motor and an underwater robot to solve at least one of the above-mentioned technical problems.

[0006] According to one aspect of this application, an electric motor is provided. The electric motor includes a housing, a rotor, a stator, a shaft, and a column; wherein the housing has a communicating first receiving cavity and a first opening; the rotor is disposed inside the first receiving cavity, and the rotor has a communicating second receiving cavity and a second opening, the second opening having an opening direction opposite to the first opening; at least a portion of the stator is disposed inside the second receiving cavity; the shaft passes through the second receiving cavity and is fixedly connected to the rotor to drive the rotor to rotate; the column is disposed inside the second receiving cavity, the column is sleeved on the shaft, the column is disposed between the shaft and the stator, and is closely connected to the stator for receiving heat generated by the stator; one end of the column is connected to the housing to conduct the heat generated by the stator to the housing.

[0007] According to some embodiments of this application, the length of the column is not less than the length of the stator in the extension direction along the axis of rotation.

[0008] According to some embodiments of this application, a heat-conducting element is also included; the heat-conducting element is disposed between the stator and the bottom wall of the housing, and is used to conduct the heat generated by the stator to the housing.

[0009] According to some embodiments of this application, the motor further includes a top cover and a sealing assembly; wherein the top cover is disposed at the first opening for sealing the first opening; the sealing assembly is disposed on the side of the top cover away from the first receiving cavity; and the rotating shaft passes through the top cover and the sealing assembly in sequence.

[0010] According to some embodiments of this application, the sealing assembly includes a sealing body, a first gland and a second gland; the first gland is fitted and connected to the side of the sealing body opposite to the first receiving cavity; the second gland is fitted and connected to the side of the sealing body facing the first receiving cavity.

[0011] According to some embodiments of this application, the sealing body includes a first annular groove; the first annular groove is disposed on the side of the sealing body facing the first pressure cap; the first pressure cap includes a first annular protrusion and a second annular protrusion; the first annular protrusion is disposed on the side of the first pressure cap facing the sealing body; the second annular protrusion is disposed on the side of the first pressure cap facing the sealing body and is disposed within the first annular protrusion, the second annular protrusion being embedded in the interior of the first annular groove; wherein, the outer wall of the first annular groove is embedded between the first annular protrusion and the second annular protrusion.

[0012] According to some embodiments of this application, the sealing body further includes a groove and a second annular groove; the groove is disposed on the side of the sealing body facing the second pressure cap, and the opening direction of the groove faces the second pressure cap; the second annular groove is disposed on the bottom wall of the groove; the second pressure cap includes a third annular protrusion; the third annular protrusion is disposed on the side of the second pressure cap facing the sealing body; wherein, the third annular protrusion is embedded in the interior of the second annular groove; the second pressure cap is embedded in the interior of the groove.

[0013] According to some embodiments of this application, the second cover further includes a cover body; the cover body is connected to a third annular protrusion; wherein, in the extension direction along the axis of rotation, the thickness of the cover body is less than the depth of the groove.

[0014] According to some embodiments of this application, the top cover includes a third annular groove; the third annular groove is disposed on the side facing the sealing body; the sidewall of the groove is embedded in the interior of the third annular groove; the inner sidewall of the third annular groove is embedded in the interior of the groove.

[0015] According to some embodiments of this application, the sealing body further includes at least one fourth annular groove and at least one sealing ring; the at least one fourth annular groove is disposed inside the sealing body; and at least one sealing ring is disposed one-to-one inside the at least one fourth annular groove.

[0016] According to another aspect of this application, an underwater robot is provided. The underwater robot includes the motor of any of the above-mentioned types.

[0017] According to the technical solution of this application, a column is provided between the rotating shaft and the stator. The column is closely connected to the stator, and one end of the column is connected to the outer casing. This application can directly conduct the heat generated by the stator to the outer casing for heat dissipation through the column, thereby improving the heat dissipation efficiency of the stator as a heat source. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A cross-sectional schematic diagram of a motor according to an embodiment of this application is shown; Figure 2 A cross-sectional schematic diagram of the housing in an electric motor according to an embodiment of this application is shown; Figure 3 A schematic cross-sectional view of the rotor in an electric motor according to an embodiment of this application is shown; Figure 4 A cross-sectional schematic diagram of a sealing assembly in an electric motor according to an embodiment of this application is shown; Figure 5 An exploded view of a sealing assembly in an electric motor according to an embodiment of this application is shown; Figure 6 A cross-sectional schematic diagram of the top cover of an electric motor according to an embodiment of this application is shown.

[0020] Explanation of reference numerals in the attached figures: 1. Outer shell; 11. First receiving cavity; 12. First opening; 2. Rotor; 21. Second receiving cavity; 22. Second opening; 3. Stator; 4. Shaft; 5. Column; 6. Thermal conductive components; 7. Top cover; 71. Third annular groove; 8. Sealing assembly; 81. First gland; 811. First annular protrusion; 812. Second annular protrusion; 82. Second gland; 821. Third annular protrusion; 822. Gland body; 83. Sealing body; 831. First annular groove; 832. Second annular groove; 833. Groove; 834. Fourth annular groove. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0022] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0023] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0024] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order.

[0025] In existing technologies, electric motors utilize the principles of electromagnetic induction or electromagnetic force to convert electrical energy into mechanical energy, outputting this mechanical energy in the form of rotational or linear motion. The function of electric motors is to provide a power source and motion control for other mechanical equipment. For example, they provide power and motion control for equipment such as fans, pumps, compressors, conveyor belts, machine tools, and robot joints.

[0026] An external rotor motor is a type of electric motor. The main difference between an external rotor motor and an internal rotor motor is that the rotor rotates externally, while the stator is fixed internally. External rotor motors are characterized by low speed and high torque, large moment of inertia, and compact structure. The rotor of an external rotor motor can be directly used as the mounting surface for the load. For example, a propeller can be directly mounted on the rotating rotor, the hub can be directly used as part of the wheel, and fan blades can be directly fixed to the rotor.

[0027] An underwater external rotor motor is a type of motor designed for underwater propulsion systems. The external rotor rotates while the internal stator remains stationary, thus driving underwater equipment.

[0028] The inventors discovered that the outer rotor of an underwater external rotor motor operates exposed to water, and that water directly enters the motor's interior to dissipate heat, thereby achieving high power and high thrust. However, this heat dissipation method has the following problems: 1) If the motor runs in water for a long time, it will be corroded, and the service life of the motor will be shortened.

[0029] 2) Heat dissipation is achieved by adding an outer casing to the motor, i.e., covering the rotor with an outer casing. While this method can extend the motor's operating time and lifespan in water, the heat transfer efficiency is low because heat is only transferred from the heat source to the casing through the air, which is not effective in heat dissipation. Therefore, the motor can only operate at low power and cannot meet the requirements of high thrust.

[0030] In this external rotor motor, Joule heating is generated by the current passing through the internal conductors, and losses occur in the iron core due to the alternating magnetic field. The stator is both the input side of electrical energy and the core of electromagnetic energy conversion. Therefore, the stator bears most of the energy loss during motor operation. Thus, the stator is one of the main heat sources in an external rotor motor.

[0031] Furthermore, the stator of an external rotor motor is located inside the motor, resulting in a longer heat dissipation path and greater thermal resistance compared to an internal rotor motor.

[0032] Therefore, this application provides an electric motor. The electric motor of this application improves the heat dissipation efficiency by having a column connected to the housing inside the housing, and the column being in direct contact with the heat source, thereby directly conducting the heat generated by the heat source to the housing for heat dissipation.

[0033] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Please refer to the above. Figures 1 to 3 , Figure 1 A cross-sectional schematic diagram of a motor according to an embodiment of this application is shown. Figure 2 A cross-sectional schematic diagram of the housing in an electric motor according to an embodiment of this application is shown. Figure 3 A cross-sectional schematic diagram of the rotor in an electric motor according to an embodiment of this application is shown.

[0035] According to an example embodiment, this application provides an electric motor. For example... Figure 1 As shown, the motor includes a housing 1 and a rotor 2, a stator 3, a shaft 4, and a column 5 disposed inside the housing 1.

[0036] The outer shell 1 serves to house and install other components, protect the internal components from impact, compression, and corrosion, and also transfer heat. The specific structure of the outer shell 1 is not limited in this embodiment; it can be any cylindrical structure with an internal cavity. For example, the outer shell 1 can be a cylindrical structure with an internal cavity, a triangular prism cylindrical structure with an internal cavity, a square prism cylindrical structure with an internal cavity, a pentagonal prism cylindrical structure with an internal cavity, a hexagonal prism cylindrical structure with an internal cavity, etc. In this embodiment, a cylindrical structure with an internal cavity is used as an example for illustration.

[0037] Specifically, such as Figure 2 As shown, the outer casing 1 has a first receiving cavity 11 and a first opening 12 that are connected. The rotor 2, stator 3 and column 5 are installed inside the first receiving cavity 11, and part of the structure of the rotating shaft 4 is disposed inside the first receiving cavity 11.

[0038] In this embodiment, rotor 2 specifically refers to one of the rotating components in the motor. Rotor 2 converts electrical energy into mechanical energy for rotational motion through electromagnetic induction or electromagnetic force.

[0039] Specifically, the rotor 2 is disposed inside the first receiving cavity 11. The rotor 2 has a communicating second receiving cavity 21 and a second opening 22, the second opening 22 having an opening direction opposite to that of the first opening 12. The column 5 is installed inside the second receiving cavity 21, and at least a portion of the stator 3 is disposed inside the second receiving cavity 21.

[0040] In this embodiment, stator 3 specifically refers to a stationary component in the motor. Stator 3 is one of the components in the motor that generates a rotating magnetic field. Stator 3 cooperates with rotor 2 to achieve the conversion of electrical energy into mechanical energy through electromagnetic induction or electromagnetic force.

[0041] Specifically, at least part of the stator 3 is disposed inside the second receiving cavity 21, and the rotor 2 rotates on the outer periphery of the stator 3.

[0042] The rotating shaft 4 is one of the rotating components in the motor. The functions of the rotating shaft 4 include transmitting torque (transmitting the rotational force generated by the rotor 2), supporting rotation (supporting the rotor 2 and ensuring that the rotor 2 is coaxial with the stator 3), and bearing load (bearing the weight of the rotor 2, electromagnetic force, and bending moments and torques from external loads). The specific structure of the rotating shaft 4 is not limited in this application; it can be a long metal rod, a stepped metal rod, etc. In this embodiment, a stepped metal rod is used as an example for illustration.

[0043] Specifically, the rotating shaft 4 is disposed through the second receiving cavity 21 and is fixedly connected to the rotor 2 to drive the rotor 2 to rotate.

[0044] The function of column 5 is to conduct heat. Column 5 is located inside the second receiving cavity 21. Column 5 is sleeved on the rotating shaft 4 and is located between the rotating shaft 4 and the stator 3, and is closely connected to the stator 3 to receive the heat generated by the stator 3.

[0045] The column 5 is connected to one end of the outer shell 1 to conduct the heat generated by the stator 3 to the outer shell 1.

[0046] In existing technologies, heat dissipation is achieved by adding an outer casing to the outside of the external rotor motor, essentially covering the rotor with an outer casing. While this method can extend the motor's operating time and lifespan in water, the heat transfer efficiency is low, as heat is only transferred from the heat source to the casing via air, resulting in ineffective heat dissipation. Therefore, the motor can only operate at low power and cannot meet the demands of high thrust.

[0047] In the above embodiments, this application provides a column 5 between the rotating shaft 4 and the stator 3. The column 5 is closely connected to the stator 3 and is connected to one end of the outer casing 1, which can directly conduct the heat generated by the stator 3 to the outer casing 1 for heat dissipation, thereby improving the heat dissipation efficiency of the stator 3 as a heat source.

[0048] In the embodiments of this application, the length of the column 5 is not less than the length of the stator 3 in the extension direction along the shaft 4, so that the inner side of the stator 3 is completely in contact with the outer side of the column 5, thereby increasing the heat conduction area and improving the heat conduction efficiency.

[0049] In the embodiments of this application, such as Figure 1 As shown, the motor also includes a heat-conducting component 6. The function of the heat-conducting component 6 is to conduct heat. The specific type of the heat-conducting component 6 is not limited in the embodiments of this application, as long as it is a type capable of conducting heat. For example, the specific type of the heat-conducting component 6 can be a thermally conductive silicone pad, a thermally conductive rubber pad, a thermally conductive insulating sheet, a thermally conductive potting compound, a thermally conductive grease pad, etc. In the embodiments of this application, a thermally conductive silicone pad is used as an example for illustration.

[0050] Specifically, the heat-conducting element 6 is disposed between the stator 3 and the bottom wall of the outer casing 1, and is used to conduct the heat generated by the stator 3 to the outer casing 1.

[0051] In the existing technology, there are no other components connecting the heat source and the outer casing to conduct heat; heat is conducted solely through the air, resulting in low heat dissipation efficiency for the heat source.

[0052] In the above embodiments, by providing a heat-conducting element 6 between the stator 3 and the bottom wall of the outer casing 1, the heat generated by the stator 3 is conducted to the outer casing 1 for heat dissipation, further increasing the heat-conducting area of ​​the stator 3. Correspondingly, the heat dissipation efficiency for the stator 3, the heat source, is further improved.

[0053] In the embodiments of this application, such as Figure 1 As shown, the motor also includes a top cover 7 and a sealing assembly 8.

[0054] In the embodiments of this application, the top cover 7 specifically refers to a component installed at the protruding end of the motor shaft 4. The function of the top cover 7 is to seal against water, support the shaft 4, and withstand axial and radial loads.

[0055] Specifically, the top cover 7 is located at the first opening 12 and is used to seal the first opening 12.

[0056] In this embodiment of the application, the sealing assembly 8 specifically refers to a series of components used to prevent external media such as liquids, gases, and dust from entering the motor; and also to prevent internal media such as lubricating oil and grease from leaking out of the motor.

[0057] Specifically, the sealing assembly 8 is disposed on the side of the top cover 7 opposite to the first receiving cavity 11.

[0058] Among them, the rotating shaft 4 passes through the top cover 7 and the sealing assembly 8 in sequence.

[0059] In existing technology, no sealing element is installed at the end cover of the motor, allowing external media such as liquids, gases, and dust to easily enter the motor, causing a decrease in motor performance or even damage. Simultaneously, internal media such as lubricating oil and grease can easily leak out of the motor, also resulting in reduced performance.

[0060] In the above embodiments, this application provides a sealing component 8 on the side of the top cover 7 away from the first receiving cavity 11, which can prevent external media such as liquids, gases, and dust from entering the motor; and can also prevent internal media such as lubricating oil and grease from leaking out of the motor, thus maintaining the performance of the motor and extending its service life.

[0061] refer to Figure 4 , Figure 4 A cross-sectional schematic diagram of a sealing assembly in an electric motor according to an embodiment of this application is shown.

[0062] In the embodiments of this application, such as Figure 4 As shown, the sealing assembly 8 includes a sealing body 83, a first gland 81, and a second gland 82 that are fitted together.

[0063] In this embodiment of the application, the sealing body 83 specifically refers to the structure that undertakes the main sealing function.

[0064] The first pressure cap 81 is fitted and connected to the side of the sealing body 83 away from the first receiving cavity 11 to improve the sealing effect of the side of the sealing body 83 away from the first receiving cavity 11.

[0065] The second pressure cap 82 is fitted and connected to the side of the sealing body 83 facing the first receiving cavity 11 to improve the sealing effect of the side of the sealing body 83 facing the first receiving cavity 11.

[0066] In existing technologies, the planar bonding of multiple components results in a short gap between the components, meaning a short leakage path and poor sealing performance.

[0067] In the above embodiments, the present application uses a first pressure cap 81 fitted onto the side of the sealing body 83 opposite to the first receiving cavity 11, and a second pressure cap 82 fitted onto the side of the sealing body 83 facing the first receiving cavity 11. This transforms the gap between the sealing body 83, the first pressure cap 81, and the second pressure cap 82 into a complex maze path, requiring the fluid to change direction multiple times as it passes through. During the process of turning and colliding, the fluid's kinetic energy is consumed, its flow velocity decreases, and the difficulty of traversing the entire sealing structure increases. Therefore, the sealing performance is improved.

[0068] refer to Figure 5 , Figure 5 An exploded view of a sealing assembly in an electric motor according to an embodiment of this application is shown.

[0069] In the embodiments of this application, such as Figure 5 As shown, the sealing body 83 includes a first annular groove 831, which is disposed on the side of the sealing body 83 facing the first pressure cap 81.

[0070] The first pressure cap 81 includes a first annular protrusion 811 and a second annular protrusion 812.

[0071] The first annular protrusion 811 is located on the side of the first pressure cap 81 facing the sealing body 83.

[0072] The second annular protrusion 812 is disposed on the side of the first pressure cap 81 facing the sealing body 83, and is disposed within the first annular protrusion 811. The second annular protrusion 812, together with the first annular protrusion 811 and part of the structure of the first pressure cap 81, together form a concave groove. The second annular protrusion 812 is embedded in the interior of the first annular groove 831.

[0073] The outer wall of the first annular groove 831 is embedded between the first annular protrusion 811 and the second annular protrusion 812. That is, the outer wall of the first annular groove 831 is embedded between the first annular protrusion 811, the second annular protrusion 812 and part of the structure of the first pressure cap 81 together form the interior of a concave groove.

[0074] In existing technologies, the planar bonding of multiple components results in a short gap between the components, meaning a short leakage path and poor sealing performance.

[0075] In the above embodiments, the second annular protrusion 812 is embedded inside the first annular groove 831. The outer wall of the first annular groove 831, together with the first annular protrusion 811, the second annular protrusion 812, and a portion of the first pressure cap 81, forms the interior of a concave groove. This transforms the gap between the sealing body 83 and the first pressure cap 81 into a complex labyrinthine path, requiring the fluid to change direction multiple times as it passes through. During the process of turning and colliding, the fluid's kinetic energy is consumed, its flow velocity decreases, and the difficulty of passing through the entire sealing structure increases. Therefore, the sealing performance is improved.

[0076] In the embodiments of this application, such as Figure 5 As shown, the sealing body 83 also includes a communicating groove 833 and a second annular groove 832.

[0077] The groove 833 is provided on the side of the sealing body 83 facing the second pressure cover 82, and the opening direction of the groove 833 faces the second pressure cover 82.

[0078] The second annular groove 832 is provided on the bottom wall of the groove 833.

[0079] The second pressure cap 82 includes a third annular protrusion 821. The third annular protrusion 821 is disposed on the side of the second pressure cap 82 facing the sealing body 83.

[0080] The third annular protrusion 821 is embedded inside the second annular groove 832. The second pressure cap 82 is embedded inside the groove 833.

[0081] In existing technologies, the planar bonding of multiple components results in a short gap between the components, meaning a short leakage path and poor sealing performance.

[0082] In the above embodiments, the third annular protrusion 821 is embedded inside the second annular groove 832, and the second pressure cap 82 is embedded inside the groove 833. This transforms the gap between the sealing body 83 and the second pressure cap 82 into a complex labyrinthine path, requiring the fluid to change direction multiple times as it passes through. During the process of turning and colliding, the fluid's kinetic energy is consumed, its flow velocity decreases, and the difficulty of traversing the entire sealing structure increases. Therefore, the sealing performance is improved.

[0083] In embodiments of this application, the second pressure cap 82 further includes a pressure cap body 822. The pressure cap body 822 is connected to the third annular protrusion 821.

[0084] In the direction of extension along the pivot 4, the thickness of the cap body 822 is less than the depth of the groove 833, so that the cap body 822 is completely embedded in the interior of the groove 833.

[0085] refer to Figure 6 , Figure 6 A cross-sectional schematic diagram of the top cover of an electric motor according to an embodiment of this application is shown.

[0086] In an embodiment of this application, the top cover 7 includes a third annular groove 71. The third annular groove 71 is disposed on the side facing the sealing body 83.

[0087] The sidewall of the groove 833 is embedded into the interior of the third annular groove 71.

[0088] Since the thickness of the cap body 822 is less than the depth of the groove 833 in the extension direction along the rotating shaft 4, the inner wall of the third annular groove 71 is embedded into the interior of the groove 833.

[0089] In existing technologies, the planar bonding of multiple components results in a short gap between the components, meaning a short leakage path and poor sealing performance.

[0090] In the above embodiment, the present application is embedded into the interior of the third annular groove 71 through the sidewall of the groove 833, and the inner sidewall of the third annular groove 71 is embedded into the interior of the groove 833. This transforms the gap between the sealing body 83 and the top cover 7 into a complex labyrinthine path, requiring the fluid to change direction multiple times as it passes through. During the process of turning and colliding, the fluid's kinetic energy is consumed, its flow velocity decreases, and the difficulty of passing through the entire sealing structure increases. Therefore, the sealing performance is improved.

[0091] In embodiments of this application, the sealing body 83 further includes at least one fourth annular groove 834 and at least one sealing ring (not shown in the figures).

[0092] In this embodiment, at least one fourth annular groove 834 specifically refers to two or more fourth annular grooves 834. For example, two fourth annular grooves 834, three fourth annular grooves 834, four fourth annular grooves 834, five fourth annular grooves 834, six fourth annular grooves 834, etc. In this embodiment, three fourth annular grooves 834 are used as an example for illustration.

[0093] Specifically, at least one fourth annular groove 834 is disposed inside the sealing body 83. The at least one fourth annular groove 834 is arranged at intervals inside the sealing body 83 along the extending direction of the rotating shaft 4.

[0094] In this embodiment, "at least one sealing ring" specifically refers to two or more sealing rings. For example, two sealing rings, three sealing rings, four sealing rings, five sealing rings, six sealing rings, etc. This embodiment uses three sealing rings as an example for illustration.

[0095] The function of the sealing ring is to undergo elastic deformation after being pressed into the groove and compressed, thereby allowing it to fit more tightly against irregular positions on the contact surface and achieving a better sealing effect. The specific type of sealing ring is not limited in this application embodiment, as long as it can undergo elastic deformation. For example, the specific type of sealing ring can be an O-ring, a star-shaped ring, etc. This application embodiment uses a star-shaped sealing ring as an example for illustration.

[0096] Specifically, at least one sealing ring is disposed one-to-one inside at least one fourth annular groove 834. It should be understood that the number of sealing rings is equal to the number of fourth annular grooves 834.

[0097] According to another aspect of this application, an underwater robot is provided. The underwater robot includes the motors found in any of the foregoing embodiments.

[0098] Finally, it should be noted that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric machine characterized in that, include: The outer casing has a communicating first receiving cavity and a first opening; A rotor is disposed inside the first receiving cavity, the rotor having a communicating second receiving cavity and a second opening, the second opening having an opening direction opposite to that of the first opening; The stator, at least a portion of which is disposed inside the second receiving cavity; A rotating shaft is disposed through the second receiving cavity and is fixedly connected to the rotor to drive the rotor to rotate; A column is disposed inside the second receiving cavity. The column is sleeved on the rotating shaft and is located between the rotating shaft and the stator, and is in close contact with the stator to receive the heat generated by the stator. The column is connected to one end of the outer casing to conduct the heat generated by the stator to the outer casing.

2. The electric machine of claim 1, wherein, The length of the column is not less than the length of the stator in the direction of extension along the axis of rotation.

3. The motor according to claim 1, characterized in that, Also includes: A heat-conducting component is disposed between the stator and the bottom wall of the housing, for conducting the heat generated by the stator to the housing.

4. The motor according to claim 1, characterized in that, The motor also includes: A top cover is provided at the first opening to seal the first opening; A sealing assembly is disposed on the side of the top cover opposite to the first receiving cavity; The rotating shaft passes through the top cover and the sealing assembly in sequence.

5. The motor according to claim 4, characterized in that, The sealing assembly includes: Sealing body; The first pressure cap is fitted and connected to the side of the sealing body opposite to the first receiving cavity; The second pressure cap is fitted and connected to the side of the sealing body facing the first receiving cavity.

6. The motor according to claim 5, characterized in that, The sealing body includes: A first annular groove is provided on the side of the sealing body facing the first gland; The first pressure cap includes: The first annular protrusion is disposed on the side of the first gland facing the sealing body; The second annular protrusion is disposed on the side of the first pressure cap facing the sealing body and is disposed within the first annular protrusion; the second annular protrusion is embedded in the interior of the first annular groove. The outer wall of the first annular groove is embedded between the first annular protrusion and the second annular protrusion.

7. The motor according to claim 5, characterized in that, The sealing body further includes: A groove is provided on the side of the sealing body facing the second pressure cover, and the opening direction of the groove faces the second pressure cover; The second annular groove is provided on the bottom wall of the groove; The second pressure cap includes: The third annular protrusion is located on the side of the second gland facing the sealing body; The third annular protrusion is embedded inside the second annular groove; The second pressure cap is embedded inside the groove.

8. The motor according to claim 7, characterized in that, The second pressure cap also includes: The pressure cap body is connected to the third annular protrusion; Wherein, in the extending direction along the axis of rotation, the thickness of the gland body is less than the depth of the groove.

9. The motor according to claim 8, characterized in that, The top cover includes: The third annular groove is provided on the side facing the sealing body; The sidewall of the groove is embedded into the interior of the third annular groove; The inner wall of the third annular groove is embedded inside the groove.

10. The motor according to any one of claims 5-9, characterized in that, The sealing body further includes: At least one fourth annular groove is disposed inside the sealing body; At least one sealing ring is disposed inside the at least one fourth annular groove.

11. An underwater robot, characterized in that, The motor includes any one of claims 1-10.

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