A motor sealing and waterproof device for underwater robot

Abstract

The present invention discloses a motor sealing and waterproof device for an underwater robot, comprising an integrated sealing shell, an inner cavity of the integrated sealing shell being connected to a rotor shell, an end of the rotor shell close to the end of the integrated sealing shell being connected to a positioning ring, a middle portion of the positioning ring being connected to a rotating shaft, and the entire motor body being sealed by the integrated sealing shell, thereby reducing the areas requiring sealing and increasing the reliability of the sealing; at the same time, the integrated shell can increase the pressure-bearing capacity of the entire motor underwater, and allow the motor to maintain internal and external air pressure balance within 6 meters underwater, without forming an internal and external air pressure difference due to shell deformation, thereby improving the working efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically to a motor sealing and waterproof device for an underwater robot. Background Art

[0002] Underwater robots are essential tools for human beings to explore and develop the ocean, and play a key role in the development and utilization of the ocean. As part of the underwater robot's drive device, the waterproof performance of the motor determines the operating depth of the underwater robot.

[0003] The motors currently used in underwater robots do not have an integrated sealed shell, so each joint of the motor shell needs to be sealed. This not only increases the sealing position, but also reduces the underwater bearing capacity of the entire motor. As a result, the motor may cause an imbalance in internal and external air pressure when it is 6 meters underwater, which may cause the motor shell to deform, causing water to flow into the motor, and ultimately causing the internal parts of the motor to rust and lose function. Summary of the invention

[0004] The object of the present invention is to provide a motor sealing and waterproof device for an underwater robot to solve the problems raised in the above background technology.

[0005] A motor sealing and waterproof device for an underwater robot comprises an integrated sealing shell, the inner cavity of the integrated sealing shell is connected to a rotor shell, one end of the rotor shell close to the end of the integrated sealing shell is connected to a positioning ring, and the middle part of the positioning ring is connected to a rotating shaft.

[0006] Preferably, the end of the positioning ring away from the end of the integrated sealing shell is connected to the first bearing, the outer side of the first bearing is connected to a support, the outer side of the end of the support close to the first bearing is connected to the stator core, and the stator core is an important component of the motor magnetic circuit, and it, together with the rotor core and the air gap between the stator and the rotor, constitute the complete magnetic circuit of the motor.

[0007] Preferably, a magnet is connected to the outer surface of the stator core, a PCB board is connected to one end of the rotor shell away from the positioning ring, a wire is connected to one end of the PCB board away from the rotor shell, a screw is connected to the connection between the support and the integrated sealing shell, the positioning rings are made by turning from bar stock, and are assembled on the central shaft before the armature is sprayed with glue, the thickness of the positioning ring is axial, and can provide blocking thrust, and is mainly suitable for motors working in vibration or impact environments.

[0008] Preferably, the end of the support away from the first bearing is connected to the second bearing, the end of the second bearing away from the first bearing is connected to a skeleton oil seal, the end of the skeleton oil seal away from the second bearing is connected to an oil seal pressure plate, the outer surface of the support is provided with a wire outlet hole, and the skeleton oil seal mainly seals the surface of the rotating shaft.

[0009] Preferably, a thread groove is formed at one end of the rotating shaft away from the positioning ring, and the thread groove formed at one end of the rotating shaft is located outside the integrated sealing shell, and the first bearing and the second bearing are installed in the inner cavity of the support.

[0010] Preferably, the wire is located on the outside of the support through the wire outlet hole, the gap between the PCB board and the support is sealed by silicone, and the wire outlet hole opened by the support is sealed by sealant, so that two layers of sealing are required at the wire outlet hole, one layer of sealing is the glue seal between the PCB board and the support, and the other layer is the glue seal of the entire wire outlet hole, which can prevent water from penetrating into the motor through the wire outlet hole.

[0011] Preferably, the support is connected to the integrated sealing shell by screws, and the connection between the screws, the support and the integrated sealing shell is sealed with silicone.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1) In the present invention, the entire motor body is sealed by an integrated sealing shell, thereby reducing the places that need to be sealed and increasing the reliability of the seal. At the same time, the integrated shell can increase the pressure-bearing capacity of the entire motor underwater and allow the motor to maintain internal and external air pressure balance within 6 meters underwater. The internal and external air pressure difference will not be formed due to the deformation of the shell, thereby improving the working efficiency of the motor.

[0014] 2) In the present invention, the rotating shaft is sealed by using a skeleton oil seal, and then the gap between the PCB board and the support and the wire outlet hole are sealed by using silicone. In this way, the entire motor is sealed by the skeleton oil seal and the silicone seals at the other two locations, so that the interior of the entire motor is fully separated from the external water environment, thereby preventing water from entering the interior of the motor due to water pressure and causing the internal parts of the motor to rust and lose their functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the overall split structure of the present invention;

[0017] Figure 3 It is a schematic side view of a part of the structure of the present invention;

[0018] Figure 4 It is a schematic front view of part of the structure of the present invention.

[0019] Explanation of the numbers in the figure: 1. Integrated sealing shell; 2. Rotor shell; 3. Magnet; 4. Positioning ring; 5. Rotating shaft; 6. Stator core; 7. First bearing; 8. Support; 9. PCB board; 10. Wire; 11. Second bearing; 12. Skeleton oil seal; 13. Oil seal pressure plate; 14. Screw; 15. Wire outlet hole. DETAILED DESCRIPTION

[0020] Example: See Figure 1-2 A motor sealing and waterproof device for an underwater robot includes an integrated sealing shell 1, the inner cavity of which is tightly connected to a rotor shell 2. A positioning ring 4 is mounted at one end of the rotor shell 2 close to the end of the integrated sealing shell 1, and a rotating shaft 5 is firmly connected to the middle portion of the positioning ring 4.

[0021] If you view Figure 1-2 It will be found that the end of the locating ring 4 away from the end of the integrated sealing shell 1 is carefully connected to the first bearing 7, and a support 8 is provided on the outside of the first bearing 7, and the outside of the support 8 close to the first bearing 7 is connected to the stator core 6.

[0022] Look again Figure 2 , Figure 3 and Figure 4 , a magnet 3 is installed on the outer surface of the stator core 6, the end of the rotor shell 2 away from the positioning ring 4 is connected to the crucial PCB board 9, and the end of the PCB board 9 away from the rotor shell 2 is connected to the wire 10. The connection between the support 8 and the integrated sealed shell 1 is fixed with screws 14. It is worth mentioning that the PCB board, namely the printed circuit board, is a key support body of electronic components and an important provider of electrical connections, and is made using electronic printing technology.

[0023] Continue watching Figure 1 , Figure 3 and Figure 4 , the end of the support 8 away from the first bearing 7 is connected to the second bearing 11, and the end of the second bearing 11 away from the first bearing 7 is installed with a skeleton oil seal 12, and the end of the skeleton oil seal 12 away from the second bearing 11 is connected to the oil seal pressure plate 13. In addition, a wire outlet hole 15 is deliberately opened on the outer surface of the support 8. It should be noted that the skeleton oil seal 12 is mainly responsible for sealing the surface of the rotating shaft. The sealing principle is that there is an oil film controlled by the oil seal edge between the oil seal and the shaft, and this oil film has fluid lubrication properties. Under the action of the surface tension of the liquid, the stiffness of the oil film just makes the oil film form a crescent surface at the contact end with the air, which effectively prevents the leakage of the working medium, thereby successfully realizing the sealing of the rotating shaft.

[0024] Looking at the details, a thread groove is formed at one end of the rotating shaft 5 away from the positioning ring 4, and the thread groove is located outside the integrated sealing shell 1. At the same time, the first bearing 7 and the second bearing 11 are precisely installed in the inner cavity of the support 8.

[0025] observe Figure 3 and Figure 4 , the wire 10 extends to the outside of the support 8 through the outlet hole 15. To ensure the sealing effect, the gap between the PCB board 9 and the support 8 is sealed by silicone, and the outlet hole 15 opened by the support 8 is also sealed by sealant. In other words, two layers of sealing are implemented at the outlet hole 15, one layer is the glue seal between the PCB board 9 and the support 8, and the other layer is the glue seal of the entire outlet hole 15, so that water can be effectively prevented from penetrating into the motor through the outlet hole 15.

[0026] Last look Figure 1 The support 8 is connected to the integrated sealing shell 1 through screws 14, and silicone is used to seal the connection between the screws 14, the support 8 and the integrated sealing shell 1.

[0027] The working principle of the device is as follows: First, the first bearing 7 and the second bearing 11 are accurately installed in the inner cavities at both ends of the support 8. Next, the PCB board 9 is installed on the outer side of the support 8 near the end of the first bearing 7, and one end of the wire 10 is passed through the outlet hole 15 so that it is located on the outer side of the support 8. At this time, the gap between the support 8 and the PCB board 9 is sealed with a sealant, and then the outlet hole 15 is also sealed. After the sealing work is completed, the stator core 6 is installed on the outer surface of the support 8 near the end of the first bearing 7. After the installation of the stator core 6 is completed, the thread groove opened at one end of the rotating shaft 5 is passed through the first bearing 7 and the second bearing 11 in sequence, and is located on the outer side of the support 8. Then, the positioning ring 4 is installed at the other end of the rotating shaft 5. At this time, the skeleton oil seal 12 is installed in the inner cavity of the support 8 near the second bearing 11, and the rotating shaft 5 is sealed. After that, the oil seal pressure plate 13 is installed on the outer side of the skeleton oil seal 12. When the oil seal pressure plate 13 is installed, the positioning ring 4 is installed at the end of the rotor shell 2. At this time, the magnet 3 installed in the inner cavity of the rotor shell 2 is just located on the outer surface of the stator core 6. Next, the rotor shell 2 is installed in the inner cavity of the integrated sealing shell 1. Finally, the support 8 and the integrated sealing shell 1 are fixed together by screws 14, and the connection between the screws 14 and the support 8 and the integrated sealing shell 1 is sealed with silicone. At this point, a complete motor is assembled.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A motor sealing and waterproof device for an underwater robot, comprising an integrated sealing shell (1), characterized in that: The inner cavity of the integrated sealing shell (1) is connected to a rotor shell (2), one end of the rotor shell (2) close to the end of the integrated sealing shell (1) is connected to a positioning ring (4), and the middle part of the positioning ring (4) is connected to a rotating shaft (5); The end of the positioning ring (4) away from the end of the integrated sealing shell (1) is connected to a first bearing (7), the outer side of the first bearing (7) is connected to a support (8), and the outer side of the end of the support (8) close to the first bearing (7) is connected to a stator core (6); The outer surface of the stator core (6) is connected to a magnet (3); the end of the rotor shell (2) away from the positioning ring (4) is connected to a PCB board (9); the end of the PCB board (9) away from the rotor shell (2) is connected to a wire (10); and a screw (14) is connected to the connection between the support (8) and the integrated sealing shell (1); The end of the support (8) away from the first bearing (7) is connected to the second bearing (11), the end of the second bearing (11) away from the first bearing (7) is connected to the skeleton oil seal (12), the end of the skeleton oil seal (12) away from the second bearing (11) is connected to the oil seal pressure plate (13), and the outer surface of the support (8) is provided with a wire outlet hole (15); The wire (10) is located outside the support (8) by passing through the wire outlet hole (15), the gap between the PCB board (9) and the support (8) is sealed by silicone, and the wire outlet hole (15) opened in the support (8) is sealed by sealant.

2. The motor sealing and waterproof device of an underwater robot according to claim 1, characterized in that: A thread groove is formed at one end of the rotating shaft (5) away from the positioning ring (4), and the thread groove formed at one end of the rotating shaft (5) is located outside the integrated sealing shell (1), and the first bearing (7) and the second bearing (11) are installed in the inner cavity of the support (8).

3. The motor sealing and waterproof device of an underwater robot according to claim 1, characterized in that: The support (8) is connected to the integrated sealing shell (1) via screws (14).

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