Permanent magnet direct current motor for underwater operation

Abstract

The utility model provides a permanent magnet DC motor for underwater operation, which comprises a shell, a stator assembly and a rotor assembly, the shell comprises a cylinder and an end cover assembly, the stator assembly is arranged in the cylinder, and the rotor assembly is rotatably arranged on the inner side of the stator assembly; the end cover assembly comprises a front end cover and a rear end cover, and holes or gaps between the front end cover and the cylinder body and between the rear end cover and the cylinder body are sealed through sealing parts. A water leakage detection part comprises a first detection conductive part and a second detection conductive part, the first detection conductive part is arranged in the rear end cover and extends for a certain distance in the circumferential direction of the rear end cover, and the first end of the second detection conductive part is connected with the first detection conductive part; the second end of the second detection conductive member extends into the cylinder. By applying the technical scheme, the permanent magnet direct current motor which can still keep good sealing performance in an underwater environment and has a water inlet detection function can be provided.

Description

Technical Field

[0001] The utility model relates to a permanent magnet DC motor used for underwater operations. Background Art

[0002] Permanent magnet DC motors (PMDCs) are widely used due to their high efficiency and reliability, particularly in a wide range of industrial and consumer products. The basic structure of a PMDC motor consists of several key components: the iron cylinder assembly, the rotor assembly, the stator assembly, and the end cap assembly. These components work together to generate and output mechanical torque, driving various equipment and tools.

[0003] As the application of permanent magnet DC motors expands into more complex environments, particularly underwater operations, existing designs face technical challenges that impact performance and safety. Underwater operations place extremely high demands on the motor's sealing properties. The motor must be able to operate in high-pressure water environments for extended periods without leaking or damaging. Current sealing technologies are not ideal for high pressures or prolonged immersion. If the seal fails, water can seep into the motor, corroding the rotor, stator, and core components, leading to motor failure or even damage.

[0004] More seriously, most permanent magnet DC motors currently lack alarm and automatic protection mechanisms for underwater operation. This means that when a seal fails or water intrudes, the motor fails to generate an alarm, making it difficult for operators to detect the problem in a timely manner. This can cause the equipment to remain in a faulty state for extended periods, potentially leading to safety incidents such as short circuits. Utility Model Content

[0005] The purpose of the present utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a permanent magnet DC motor which can maintain good sealing performance in an underwater environment and has water ingress detection capability.

[0006] In order to solve the above technical problems, the present invention provides a permanent magnet DC motor for underwater operations, comprising a housing, a stator assembly, and a rotor assembly. The housing comprises a barrel and an end cover assembly. The stator assembly is disposed within the barrel, and the rotor assembly is rotatably disposed inside the stator assembly. The end cover assembly comprises a front end cover and a rear end cover. The front end cover is disposed at the front end of the barrel, and the rear end cover is disposed at the rear end of the barrel. The gaps or pores between the front end cover and the rear end cover and the barrel are sealed by a sealing component.

[0007] The permanent magnet DC motor also includes a water leakage detection component, which includes a first detection conductive part and a second detection conductive part. The first detection conductive part is arranged in the rear end cover and extends a distance along the circumference of the rear end cover. The first end of the second detection conductive part is connected to the first detection conductive part, and the second end of the second detection conductive part extends in the cylinder.

[0008] In a more preferred embodiment, it also includes a fixed bracket, which is fixedly connected to the rear end cover, and the fixed bracket includes a first wall and a second wall spaced apart along the radial direction of the rear end cover, and an accommodating space is formed between the first wall and the second wall, and the first detection conductive part is arranged in the accommodating space.

[0009] In a more preferred embodiment, the fixing bracket further includes a placement plane, the placement plane is located on the upper end surface of the first wall, and the first detecting conductive member is fixed on the placement plane by bolts.

[0010] In a more preferred embodiment, the first detection conductive member includes a first conductive fixing ring, the first end of the second detection conductive member is provided with a second conductive fixing ring, a fixing bolt passes through the first conductive fixing ring and the second conductive fixing ring to be fixed on the placement plane, and the first conductive fixing ring and the second conductive fixing ring are conductively connected.

[0011] In a more preferred embodiment, the first wall body includes a first extension wall extending a distance along the axial direction of the cylinder, and the second wall body includes a second extension wall extending a distance along the axial direction of the cylinder.

[0012] In a more preferred embodiment, a fixing seat is further included, wherein the fixing seat is fixedly disposed on the cylinder, and the fixing seat includes a through-hole extending along the axial direction, and the second detection conductive sheet passes through the through-hole.

[0013] In a more preferred embodiment, a first sealing ring is sealed between the front end cover and the front end of the cylinder; and a second sealing ring is sealed between the rear end cover and the rear end of the cylinder.

[0014] In a more preferred embodiment, the front end cover is fixedly connected to the front end of the cylinder by a plurality of first bolts, and the front end cover includes a plurality of first countersunk holes for accommodating the heads of the first bolts; the permanent magnet DC motor also includes a plurality of first sealing gaskets.

[0015] In a more preferred embodiment, the rear end cover is fixedly connected to the rear end of the cylinder by a plurality of second bolts, and the rear end cover includes a plurality of second countersunk holes for accommodating the heads of the second bolts; the permanent magnet DC motor also includes a plurality of second sealing gaskets.

[0016] In a more preferred embodiment, the rear end cover includes a lead interface, a lead assembly includes a power cord, a rubber sheath, a sealing sleeve and a connecting sleeve; the sealing sleeve is hot-melt-fitted onto the rubber sheath, and the connecting sleeve is hot-melt-fitted onto the sealing sleeve and the rubber sheath respectively; the lead assembly is plugged into the lead interface, the sealing sleeve is sealed and connected to the inner wall of the lead interface, and the connecting sleeve is fixedly connected to the lead interface.

[0017] Compared with the existing technology, the technical solution of the utility model has the following beneficial effects:

[0018] The pores or gaps between the front and rear covers and the cylinder are sealed by sealing components. The provision of the sealing components ensures that the various components of the motor are tightly connected, leaving no unsealed gaps, thereby effectively preventing moisture from penetrating into the interior of the motor. The water leakage detection component includes a first detection conductive member and a second detection conductive member, wherein the first detection conductive member is disposed in the rear cover and extends a distance along the circumference of the rear cover to form a detection area surrounding the rear of the motor. The first end of the second detection conductive member is connected to the first detection conductive member, and the second end of the second detection conductive member extends into the cylinder, thereby being able to detect water leakage in the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the three-dimensional schematic diagrams of a permanent magnet DC motor in a preferred embodiment of the present utility model;

[0020] Figure 2 This is the second three-dimensional schematic diagram of the permanent magnet DC motor in the preferred embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of a permanent magnet DC motor in a preferred embodiment of the present utility model;

[0022] Figure 4 for Figure 3 A partial enlarged view of

[0023] Figure 5 This is an exploded view of the water leakage detection component in the preferred embodiment of the present utility model;

[0024] Figure 6 This is a three-dimensional schematic diagram of a water leakage detection component in a preferred embodiment of the present utility model;

[0025] Figure 7It is a three-dimensional schematic diagram of the rear end cover in a preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] See Figure 1-Figure 7 A permanent magnet DC motor for underwater operations includes a housing, a stator assembly 2, and a rotor assembly 3. The housing includes a barrel 11 and an end cap assembly. The stator assembly 2 is disposed within the barrel 11, and the rotor assembly 3 is rotatably disposed inside the stator assembly 2. The end cap assembly includes a front end cap 121 and a rear end cap 122. The front end cap 121 covers the front end of the barrel 11, and the rear end cap 122 covers the rear end of the barrel 11. The gaps between the front and rear ends of the barrel 11 are sealed by sealing components. To accommodate underwater operations, the permanent magnet DC motor is designed to seal the gaps between the front and rear ends of the barrel 11. This sealing component ensures that the motor's components are tightly connected, leaving no unsealed gaps, thereby effectively preventing moisture from penetrating the motor. The sealing component can be made of a high-strength rubber ring or other material suitable for high-pressure environments, capable of maintaining a seal for extended periods underwater. This design allows the motor to withstand external water pressure during operation and prevents motor failure or short circuits caused by water ingress. This excellent sealing performance makes the motor particularly suitable for underwater operating environments, ensuring stable operation in high-humidity and high-pressure environments and extending the service life of the equipment.

[0028] The permanent magnet DC motor also includes a water leakage detection component 4, which includes a first detection conductive member 41 and a second detection conductive member 42. The first detection conductive member 41 is disposed within the rear end cover 122 and extends a distance along the circumference of the rear end cover 122 to form a detection area surrounding the rear of the motor. The first end of the second detection conductive member 42 is connected to the first detection conductive member 41, and the second end of the second detection conductive member 42 extends within the cylinder 11, thereby detecting water leaks within the cylinder 11. When the motor seal fails and external water seeps into the motor, the water, as a conductive medium, affects the resistance between the two detection conductive members, causing the voltage between them to change. This voltage change can be quickly detected and trigger an alarm system, alerting the operator to take timely action. Furthermore, the system can use this signal to automatically shut down the motor to prevent further damage caused by continued operation. This design not only detects water leaks at an early stage but also effectively prevents electrical leakage accidents, greatly improving the safety and reliability of the motor in underwater operating environments.

[0029] The permanent magnet DC motor also includes a fixed bracket 5, which is fixedly connected to the rear end cover 122. The fixed bracket 5 includes a first wall 51 and a second wall 52 spaced apart along the radial direction of the rear end cover 122. An accommodating space 53 is formed between the first wall 51 and the second wall 52, and the first detection conductive member 41 is arranged in the accommodating space 53. The accommodating space 53 not only effectively isolates the first detection conductive member 41 from the rest of the motor components, preventing damage to the detection conductive member due to external impact or interference from moving parts, but also can limit the first detection conductive member 41 to ensure its stable position and avoid displacement or loosening due to vibration or external force. This design improves the service life of the detection component and the reliability of detection.

[0030] The fixing bracket 5 also includes a placement plane 54 located on the upper end surface of the first wall 51. The first detection conductive member 41 is fixed to the placement plane 54 via bolts. The first detection conductive member 41 is fixed to the placement plane 54 via bolts. This fixing method is both simple and convenient, ensuring that the first detection conductive member 41 is not easily loosened during operation, and enhancing the reliability and stability of the installation.

[0031] The first detection conductive member 41 includes a first conductive fixing ring 411, and the first end of the second detection conductive member 42 is provided with a second conductive fixing ring 421. A fixing bolt passes through the first conductive fixing ring 411 and the second conductive fixing ring 421 to secure the first conductive fixing ring 411 to the placement plane 54, and the first conductive fixing ring 411 and the second conductive fixing ring 421 are electrically connected. The first conductive fixing ring 411 and the second conductive fixing ring 421 are fixed to the placement plane 54 by a fixing bolt, maintaining an electrically conductive connection. This structural design ensures a secure and reliable connection between the two conductive members, preventing circuit interruption caused by loosening while ensuring the stability of the entire detection circuit, contributing to the efficient operation of the water leakage detection system.

[0032] The first wall 51 includes a first extension wall 511 extending a distance along the axial direction of the cylinder 11, and the second wall 52 includes a second extension wall 512 extending a distance along the axial direction of the cylinder 11. This design not only increases the structural strength of the fixing bracket 5, but also effectively protects the first detection conductive member 41 located in the accommodating space 53. During the operation of the motor, the carbon brushes in the rear end cover 122 generate carbon powder when they come into contact with the commutator. This carbon powder is easily scattered and may affect other components inside the motor, especially the detection conductive member. The provision of the first extension wall 511 and the second extension wall 512 forms a protective barrier to prevent carbon powder from falling onto the detection conductive member. In this way, the carbon powder will not directly contact the first detection conductive member 41, thereby avoiding the situation where the detection conductive member generates false alarms due to the conductivity of the carbon powder. This physical isolation not only improves the accuracy of the water leakage detection system, but also extends the service life of the detection conductive member, reduces the frequency of routine maintenance, and ensures the reliability and stability of the motor during underwater operation.

[0033] The permanent magnet DC motor further includes a fixing base 6, which is fixedly mounted on the cylinder 11. The fixing base 6 includes a through-hole extending along the axial direction, through which the second detection conductive sheet passes. The fixing base 6 can stabilize the second detection conductive sheet.

[0034] A first sealing ring 1211 is sealed between the front end cover 121 and the front end of the cylinder 11. A second sealing ring 1221 is sealed between the rear end cover 122 and the rear end of the cylinder 11. The front end cover 121 is fixedly connected to the front end of the cylinder 11 via a plurality of first bolts. The front end cover 121 includes a plurality of first countersunk holes 1212 for accommodating the heads of the first bolts. The permanent magnet DC motor also includes a plurality of first sealing gaskets 1213.

[0035] The rear end cover 122 is fixedly connected to the rear end of the cylinder 11 by a plurality of second bolts. The rear end cover 122 includes a plurality of second countersunk holes 1222 for accommodating the heads of the second bolts. The permanent magnet DC motor also includes a plurality of second sealing gaskets 1223.

[0036] In this embodiment, two first sealing rings 1211 are provided. One first sealing ring 1211 is disposed between the outer wall of the front end cover 121 and the inner wall of the barrel 11, providing a radial seal to prevent external moisture from penetrating radially into the motor interior. The other first sealing ring 1211 is disposed between the front end face of the barrel 11 and the front end cover 121, primarily providing an axial seal to prevent water leakage at the junction of the front end cover 121 and the barrel 11.

[0037] In this embodiment, two second sealing rings 1221 are provided. One second sealing ring 1221 is disposed between the outer wall of the rear end cover 122 and the inner wall of the cylindrical body 11, providing a radial seal to prevent external moisture from penetrating radially into the interior of the motor. The other second sealing ring 1221 is disposed between the rear end face of the cylindrical body 11 and the rear end cover 122, primarily providing an axial seal to prevent water leakage at the junction of the front end cover 121 and the cylindrical body 11.

[0038] These sealing rings provide multiple layers of protection for the motor in both axial and radial directions, preventing moisture from entering the motor from any direction. Furthermore, by fastening the front and rear covers 121 and 122 to the cylinder 11 with first and second bolts, the axial contact between the three components is even closer, further enhancing the effectiveness of the seal. This tightening of the bolts not only strengthens the mechanical connection but also ensures that the sealing rings are firmly pressed against the joints, significantly reducing the gaps through which moisture could penetrate and ensuring the motor's excellent waterproof performance during underwater operation.

[0039] The rear end cover 122 includes a lead interface 123, and a lead assembly 7 includes a power cord 71, a rubber sheath 72, a sealing sleeve 73 and a connecting sleeve 74; the sealing sleeve 73 is hot-melt-fitted onto the rubber sheath 72, and the connecting sleeve 74 is hot-melt-fitted onto the sealing sleeve 73 and the rubber sheath 72 respectively; the lead assembly 7 is plugged into the lead interface 123, the sealing sleeve 73 is sealedly connected to the inner wall of the lead interface 123, and the connecting sleeve 74 is fixedly connected to the lead interface 123. The sealing sleeve 73 is tightly fitted onto the rubber sheath 72 through a hot-melt process, forming a tight protective barrier that effectively prevents moisture or corrosive substances from penetrating into the interior of the motor from the connection point. The hot-melt connection between the sealing sleeve 73 and the rubber sheath 72 can maintain long-term stability in a high-pressure underwater environment and is not prone to loosening or failure. In addition, the connecting sleeve 74 is connected to the sealing sleeve 73 and the rubber sleeve 72 respectively through the same hot-melt process. This double hot-melt connection further enhances the overall sealing effect and connection firmness.

[0040] When lead assembly 7 is plugged into lead interface 123, sealing sleeve 73 forms a tight seal with the inner wall of lead interface 123, thereby preventing the ingress of moisture. Simultaneously, connecting sheath 74 is securely connected to lead interface 123, ensuring that lead assembly 7 will not loosen or fall off under stress or vibration. This multi-seal design significantly enhances the product's waterproof and corrosion resistance, making it particularly suitable for permanent magnet DC motors operating underwater, ensuring long-term, reliable operation in harsh environments.

[0041] The above is only a preferred specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A permanent magnet DC motor for underwater operation, characterized in that: The invention comprises a housing, a stator assembly and a rotor assembly, wherein the housing comprises a cylinder and an end cover assembly, the stator assembly is arranged in the cylinder, and the rotor assembly is rotatably arranged inside the stator assembly; the end cover assembly comprises a front end cover and a rear end cover, the front end cover is arranged at the front end of the cylinder, and the rear end cover is arranged at the rear end of the cylinder, and the gaps or clearances between the front end cover and the rear end cover and the cylinder are sealed by a sealing component; The permanent magnet DC motor also includes a water leakage detection component, which includes a first detection conductive part and a second detection conductive part. The first detection conductive part is arranged in the rear end cover and extends a distance along the circumference of the rear end cover. The first end of the second detection conductive part is connected to the first detection conductive part, and the second end of the second detection conductive part extends in the cylinder.

2. A permanent magnet DC motor for underwater operation according to claim 1, characterized in that: It also includes a fixed bracket, which is fixedly connected to the rear end cover. The fixed bracket includes a first wall and a second wall spaced apart along the radial direction of the rear end cover. An accommodating space is formed between the first wall and the second wall, and the first detection conductive part is arranged in the accommodating space.

3. A permanent magnet DC motor for underwater operation according to claim 2, characterized in that: The fixing bracket further includes a placement plane, which is located on the upper end surface of the first wall body, and the first detecting conductive member is fixed on the placement plane by bolts.

4. A permanent magnet DC motor for underwater operation according to claim 3, characterized in that: The first detection conductive member includes a first conductive fixing ring, and the first end of the second detection conductive member is provided with a second conductive fixing ring. A fixing bolt passes through the first conductive fixing ring and the second conductive fixing ring to be fixed on the placement plane, and the first conductive fixing ring and the second conductive fixing ring are conductively connected.

5. A permanent magnet DC motor for underwater operation according to claim 2, characterized in that: The first wall body includes a first extension wall extending a distance along the axial direction of the cylinder body, and the second wall body includes a second extension wall extending a distance along the axial direction of the cylinder body.

6. A permanent magnet DC motor for underwater operation according to claim 1, characterized in that: It also includes a fixing seat, which is fixedly arranged on the cylinder. The fixing seat includes a through-hole extending along the axial direction, and the second detection conductive sheet passes through the through-hole.

7. A permanent magnet DC motor for underwater operation according to any one of claims 1 to 6, characterized in that: Two first sealing rings are sealed between the front end cover and the front end of the cylinder; two second sealing rings are sealed between the rear end cover and the rear end of the cylinder; One of the first sealing rings is arranged between the outer wall of the front end cover and the inner wall of the cylinder, and the other first sealing ring is arranged between the front end surface of the cylinder and the front end cover; One of the second sealing rings is arranged between the outer wall of the rear end cover and the inner wall of the cylinder, and the other second sealing ring is arranged between the rear end surface of the cylinder and the rear end cover.

8. A permanent magnet DC motor for underwater operation according to claim 7, characterized in that: The front end cover is fixedly connected to the front end of the cylinder by a plurality of first bolts. The front end cover includes a plurality of first countersunk holes for accommodating the heads of the first bolts. The permanent magnet DC motor also includes a plurality of first sealing gaskets.

9. A permanent magnet DC motor for underwater operation according to claim 7, characterized in that: The rear end cover is fixedly connected to the rear end of the cylinder by a plurality of second bolts. The rear end cover includes a plurality of second countersunk holes for accommodating the heads of the second bolts. The permanent magnet DC motor also includes a plurality of second sealing gaskets.

10. A permanent magnet DC motor for underwater operation according to claim 7, characterized in that: The rear end cover includes a lead interface, A lead assembly includes a power cord, a rubber sheath, a sealing sleeve and a connecting sleeve; the sealing sleeve is hot-melt-fitted onto the rubber sheath, and the connecting sleeve is hot-melt-fitted onto the sealing sleeve and the rubber sheath respectively; the lead assembly is plugged into the lead interface, the sealing sleeve is sealed and connected to the inner wall of the lead interface, and the connecting sleeve is fixedly connected to the lead interface.

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