An underwater outer rotor sand-proof motor and propeller

Abstract

The present invention discloses an underwater outer rotor sand-proof motor and propeller, and relates to the technical field of underwater outer rotor motors. The motor includes a front cover, a yoke, a rear cover and a rotating shaft, one end of the rotating shaft is fixedly connected to one end of the front cover, and the other end is fixed in the hollow shaft of the rear cover through a bearing, the other end of the front cover is fixedly connected to one end of the yoke, and a wear-resistant ring is arranged at the end of the rear cover, the other end of the yoke is located in the wear-resistant ring, and the outer wall of the yoke is adapted to the inner wall of the wear-resistant ring. The underwater propeller includes the above-mentioned motor, and also includes a propeller connected to the front cover and a propeller housing connected to the rear cover. The opening gap between the stator and the rotor of the motor is reduced by the wear-resistant ring, and the small friction coefficient of the wear-resistant ring is utilized. Under the premise that there are no additional special requirements for the processing and assembly of the motor parts, the assembly gap is greatly reduced, and the service life of the wear-resistant ring is guaranteed, so that the motor has a good sand-proof effect, and there will be no phenomenon of sand damage and jamming.

Description

Technical Field

[0001] The invention relates to the technical field of underwater outer rotor motors, and in particular to an underwater outer rotor anti-sand motor and a propeller. Background Art

[0002] Underwater thrusters are important power components of underwater equipment, especially ROVs, which usually achieve various underwater movements by carrying multiple thrusters. The thrusters are mainly composed of propellers and motors. They are widely used in various small and medium-sized submersibles and thrusters because of their simple and compact structure, small size, light weight, simple and reliable sealing, etc. Under the same volume conditions, the power and torque provided by the outer rotor motor are greater than other types of motors, which has obvious advantages, so most of them use outer rotor motors as the power source of the thruster. In order to prevent the motor from being damaged by water ingress, the stator and winding are potted, and the easily corrosive parts are treated with anti-corrosion to obtain an underwater outer rotor motor used in deeper waters.

[0003] In order to facilitate the mutual movement between the motor rotor and stator, there is enough assembly gap between the two. When underwater, water will enter the motor from the gap, especially the air gap between the stator core and the magnet. In order to make the motor drive more powerful, this air gap is usually small, generally around 0.4mm-1.5mm. The assembly gap between the rotor and the stator is usually 0.5mm-1mm. In particular, the stator material is generally unable to cope with the friction of large sand and gravel. After the sand and gravel enter, it will soon wear out, causing damage to the stator and further increase the gap between the rotor and the stator. When running underwater in a more complex environment, sand and gravel will enter the motor with the water flow. Larger sand and gravel will scratch the internal anti-corrosion layer of the motor, causing the components to be corroded and fail, and some sand and gravel will directly enter the air gap and cause the motor to jam. The above situation can be reduced by reducing the opening gap between the rotor and the stator, but it also requires the stator and rotor to have higher processing accuracy and assembly accuracy, which greatly increases the cost and affects production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide an underwater outer rotor sand-proof motor and a propeller, so as to solve the problem that the existing motor is damaged and stuck due to sand intrusion.

[0005] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: an underwater outer rotor sand-proof motor, characterized in that it includes a front end cover, a yoke, a rear end cover and a rotating shaft, one end of the rotating shaft is fixedly connected to one end of the front end cover, and the other end is fixed in the hollow shaft of the rear end cover through a bearing, the other end of the front end cover is fixedly connected to one end of the yoke, a wear-resistant ring is provided at the end of the rear end cover, the other end of the yoke is located in the wear-resistant ring, and the outer wall of the yoke is adapted to the inner wall of the wear-resistant ring.

[0006] A further technical solution is that the single-side gap between the outer wall of the yoke and the inner wall of the wear-resistant ring is ≤0.1 mm.

[0007] A further technical solution is that the rear end cover is composed of a hollow shaft and a rear cover fixing plate, a fixing hole is provided on the rear cover fixing plate, one end of the hollow shaft is fixedly connected to the fixing hole, and a wire passing hole is provided on the rear cover fixing plate.

[0008] A further technical solution is that a stator winding is sleeved on the outer side wall of the hollow shaft.

[0009] A further technical solution is that a through hole is opened on the front end cover, a shaft fixing hole is opened on the side wall of the through hole, one end of the shaft is inserted into the through hole, and the shaft is fixedly connected to the front end cover by a set screw through the shaft fixing hole.

[0010] A further technical solution is that magnets are evenly arranged in an annular direction on the front end cover, and the magnets are adapted to the magnetic yoke.

[0011] The present invention also adopts the following technical solution: an underwater propeller, characterized in that it includes the above-mentioned underwater outer rotor sand-proof motor, and also includes a propeller fixedly connected to the front end cover and a propeller shell fixedly connected to the rear end cover.

[0012] A further technical solution is that the thruster housing is composed of a fixing frame and a conduit, the fixing frame is provided with a rear cover fixing hole, the bottom of the rear cover fixing hole protrudes outward to form a boss, and the height of the boss is adapted to the thickness of the wear-resistant ring.

[0013] A further technical solution is that connecting rods are evenly distributed circumferentially on the outer side wall of the fixing frame, and the connecting rods are connected to the inner side wall of the catheter.

[0014] A further technical solution is that the propeller consists of a fixed guide part, a blade fixing tube and blades, the fixed guide part is fixed to the front end cover by fasteners, the end of the fixed guide part extends outward to form a blade fixing tube, the blade fixing tube is coaxially arranged with the yoke, and the blades are evenly distributed circumferentially on the outer side wall of the blade fixing tube.

[0015] Working principle: Fix the rotating shaft with the hollow shaft of the rear end cover through the bearing and seal it at the end, fit the wear-resistant ring at the end of the rear end cover by interference, connect the stator winding outside the hollow shaft, and then install the rotor consisting of the front end cover, magnet and yoke from one end of the rotating shaft. After it is installed in place, press the rotating shaft on the front end cover by the set screw to ensure the assembly clearance between the wear-resistant ring and the yoke, and complete the assembly of the outer rotor anti-sand motor. Then install the blade fixing tube of the propeller along the yoke, and fix it to the front end cover by fasteners after it is in place. Install the guide tube of the propeller housing along the blade, and fix it to the rear end cover by fasteners after it is in place, and complete the assembly of the underwater propeller.

[0016] When working, the rotor rotates around the stator, driving the propeller to rotate, and the blades and water produce relative motion. The reverse force of the water is used to drive the equipment equipped with the underwater propeller to move underwater.

[0017] During this process, due to the presence of the wear-resistant ring, the assembly gap between the inner wall of the wear-resistant ring and the outer wall of the yoke is smaller than the air gap, less than 0.1mm, so that large sand and gravel cannot enter the motor with the water flow. Sand particles with a particle size smaller than the assembly gap enter the motor and then flow out with the water flow. They will not be stuck in the air gap and cause the motor to jam. In addition, sand particles with small particle size have limited scratches on the anti-corrosion layer, which greatly improves the service life of the outer rotor motor.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: by using a wear-resistant ring made of wear-resistant material, the opening gap between the stator and the rotor of the motor is reduced, and by utilizing the small friction coefficient of the wear-resistant ring, the assembly gap can be greatly reduced without any additional special requirements for the processing and assembly of motor parts, and the service life of the wear-resistant ring can also be guaranteed. The reduction in the assembly gap enables the motor to have a good anti-sand effect, and the phenomenon of damage and jamming caused by sand intrusion will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the assembly diagram of the underwater outer rotor anti-sand motor.

[0020] Figure 2 It is a schematic diagram of the structure of the rear end cover.

[0021] Figure 3 It is a structural schematic diagram of the front end cover.

[0022] Figure 4 This is a schematic diagram of the assembly of the underwater thruster.

[0023] Figure 5 A schematic diagram of the structure of the thruster casing.

[0024] Figure 6 This is a schematic diagram of the propeller structure.

[0025] In the figure: 1-front end cover, 101-through hole, 102-rotating shaft fixing hole, 2-magnetic yoke, 3-rear end cover, 301-hollow shaft, 302-rear cover fixing plate, 4-rotating shaft, 5-wear-resistant ring, 6-stator winding, 7-magnet, 8-bearing, 9-propeller, 901-fixed guide part, 902-blade fixing tube, 903-blade, 10-thruster housing, 11-fixing frame, 1101-rear cover fixing hole, 1102-boss, 1103-connecting rod, 12-conduit. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Figure 1 An underwater outer rotor sand-proof motor is shown, comprising a front end cover 1, a yoke 2, a rear end cover 3 and a rotating shaft 4.

[0028] like Figure 3 As shown, a through hole 101 is opened on the front end cover 1, and a shaft fixing hole 102 is opened on the side wall of the through hole 101. During assembly, one end of the shaft 4 is inserted into the through hole 101. After the assembly is in place, the shaft 4 is pressed into the through hole 101 of the front end cover 1 by a set screw through the shaft fixing hole 102, thereby achieving a fixed connection between the shaft 4 and the front end cover 1.

[0029] like Figure 2 As shown, the rear end cover 3 is composed of a hollow shaft 301 and a rear cover fixing plate 302 . The rear cover fixing plate 302 is provided with a fixing hole. One end of the hollow shaft 301 is fixedly connected to the fixing hole. The rear cover fixing plate 302 is provided with a wire passing hole.

[0030] How to assemble the underwater outer rotor sand-proof motor Figure 1 As shown, the rotating shaft 4 is first fixed in the hollow shaft 301 through the bearing 8, and a shaft seal is set on the side close to the rear cover 3. The stator winding 6 is sleeved on the outer wall of the hollow shaft 3, and a wear-resistant ring 5 is fitted at the end of the rear cover fixing plate 302. The magnets 7 are evenly assembled on the front cover 1 along the circumferential direction, and then the yoke 2 is fixed on the front cover 1 to form a rotor. The rotor is installed from one end of the rotating shaft 2 so that the rotating shaft 2 passes through the through hole 101 on the front cover 1. After being assembled in place, the rotating shaft 2 is pressed into the through hole 101 of the front cover 1 by the set screws. After the assembly is completed, the assembly gap between the outer wall of the wear-resistant ring and the outer wall of the yoke is ≤0.1mm on one side.

[0031] Figure 4 An underwater propeller is shown, which uses the above-mentioned outer rotor anti-sand motor, with the propeller 9 fixed on the front cover 1 and the propeller housing 10 fixed on the rear cover 3.

[0032] like Figure 5As shown, the thruster housing 10 is composed of a fixing frame 11 and a conduit 12. The fixing frame 11 is provided with a rear cover fixing hole 1101. The bottom of the rear cover fixing hole 1101 protrudes outward to form a boss 1102. The height of the boss 1102 is adapted to the thickness of the wear-resistant ring 5. A clearance hole for the boss 1102 is provided on the wear-resistant ring 5. The boss 1102 effectively makes way for the wear-resistant ring 5, so that after the thruster housing 10 is fixed to the rear end cover 3, the wear-resistant ring 5 will not be squeezed and deformed. Connecting rods 1103 are evenly distributed on the outer wall of the fixing frame 11 in an annular direction, and the connecting rods 1103 are connected to the inner wall of the conduit 12.

[0033] like Figure 6 The propeller 9 shown in the figure is composed of a fixed guide part 901, a blade fixing tube 902 and blades 903. The fixed guide part 901 is fixed to the front end cover 1 by fasteners. The end of the fixed guide part 901 extends outward to form a blade fixing tube 902. The blade fixing tube 902 is coaxially arranged with the yoke 2. The blades 903 are evenly distributed on the outer wall of the blade fixing tube 902 in an annular direction.

[0034] During assembly, the blade fixing tube 902 of the propeller 9 is installed along the yoke 2, and fixed to the front end cover 1 by fasteners after it is in place. The guide tube 12 of the thruster housing 10 is installed along the blade 903, and fixed to the rear end cover 3 by fasteners after it is in place, thereby completing the assembly of the underwater thruster.

[0035] During operation, the rotor rotates around the stator, the rotor drives the propeller 9 to rotate, the blades 903 and the water produce relative motion, and the reverse force of the water is used to drive the equipment equipped with the underwater propeller to move underwater.

[0036] During this process, due to the presence of the wear-resistant ring 5, the assembly gap between the inner wall of the wear-resistant ring 5 and the outer wall of the yoke 2 is smaller than the air gap, less than 0.1 mm, so that large sand and gravel cannot enter the motor with the water flow. Sand particles with a particle size smaller than the assembly gap enter the motor and then flow out with the water flow. They will not be stuck in the air gap and will not cause the motor to get stuck. In addition, sand particles with a small particle size have limited scratches on the anti-corrosion layer, which greatly improves the service life of the outer rotor motor.

[0037] Although the present invention is described herein with reference to a number of illustrative embodiments of the present invention, it will be appreciated that those skilled in the art may devise numerous other modifications and implementations that will fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, drawings, and claims, a variety of variations and modifications may be made to the components and / or layouts. In addition to variations and modifications to the components and / or layouts, other uses will also be apparent to those skilled in the art.

Claims

1. An underwater outer rotor sand-proof motor, characterized in that: The invention comprises a front end cover (1), a yoke (2), a rear end cover (3) and a rotating shaft (4); one end of the rotating shaft (4) is fixedly connected to one end of the front end cover (1), and the other end is fixed in a hollow shaft (301) of the rear end cover (3) through a bearing (8); the other end of the front end cover (1) is fixedly connected to one end of the yoke (2); a wear-resistant ring (5) is arranged at the end of the rear end cover (3); the other end of the yoke (2) is located in the wear-resistant ring (5); the outer wall of the yoke (2) is adapted to the inner wall of the wear-resistant ring (5); the single-side gap between the outer wall of the yoke (2) and the inner wall of the wear-resistant ring (5) is ≤0.1 mm; the rear end cover (3) is composed of a hollow shaft (301) and a rear cover fixing plate (302) ), a fixing hole is formed on the rear cover fixing plate (302), one end of the hollow shaft (301) is fixedly connected to the fixing hole, and a wire passing hole is formed on the rear cover fixing plate (302); a stator winding (6) is sleeved on the outer wall of the hollow shaft (301); a through hole (101) is formed on the front cover (1), a rotating shaft fixing hole (102) is formed on the side wall of the through hole (101), one end of the rotating shaft (4) is inserted into the through hole (101), and the rotating shaft (4) is fixedly connected to the front cover (1) by a set screw through the rotating shaft fixing hole (102); magnets (7) are evenly arranged on the front cover (1) in an annular direction, and the magnets (7) are adapted to the magnetic yoke (2).

2. An underwater propeller, characterized in that: The invention comprises the underwater outer rotor sand-proof motor as claimed in claim 1, and further comprises a propeller (9) fixedly connected to the front end cover (1) and a thruster housing (10) fixedly connected to the rear end cover (3).

3. An underwater propeller according to claim 2, characterized in that: The thruster housing (10) is composed of a fixing frame (11) and a guide tube (12); the fixing frame (11) is provided with a rear cover fixing hole (1101); the bottom of the rear cover fixing hole (1101) protrudes outward to form a boss (1102); the height of the boss (1102) is adapted to the thickness of the wear-resistant ring (5).

4. An underwater propeller according to claim 3, characterized in that: Connecting rods (1103) are evenly distributed in an annular direction on the outer wall of the fixing frame (11), and the connecting rods (1103) are connected to the inner wall of the conduit (12).

5. The underwater propeller according to claim 2, characterized in that: The propeller (9) is composed of a fixed guide portion (901), a blade fixing tube (902) and blades (903); the fixed guide portion (901) is fixed to the front end cover (1) by means of a fastener; the end of the fixed guide portion (901) extends outward to form a blade fixing tube (902); the blade fixing tube (902) is coaxially arranged with the yoke (2); and the blades (903) are evenly distributed in an annular direction on the outer side wall of the blade fixing tube (902).

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