A multi-stage waterproof sealing assembly of a direct current motor suitable for marine unmanned equipment

Abstract

The application belongs to the technical field of marine robot equipment, and particularly relates to a multi-stage waterproof sealing assembly of a direct current motor suitable for marine unmanned equipment, which comprises a threading bolt, a tail end cover, a direct current motor, a main shell, a front end cover, a Gley cover and a shaft sleeve. One end of the tail end cover is fully open, and the other end is provided with a threaded hole II. The threading bolt is connected with the tail end cover by penetrating the threaded hole II. The rear end of the main shell is fully open, and the front end is provided with a flange hole. The tail end cover is connected with the main shell. The direct current motor is installed in the main shell by penetrating the flange hole in the front end of the main shell. One end of the front end cover is connected with the main shell, and the other end is provided with the Gley cover. One end of the Gley cover is provided with a through hole, and the other end is provided with a flange hole. The shaft sleeve is provided with a stepped surface in the inside, and the shaft sleeve is fixed on the output shaft of the direct current motor in the main shell by penetrating the through hole and the flange hole of the Gley cover. The assembly improves the sealing reliability of the high-pressure seawater under long-term immersion, is convenient to maintain and replace in the later period, and can be adapted to different installation scenes with different transmission distances.

Description

Technical Field

[0001] This application belongs to the field of marine robot equipment technology, specifically relating to a multi-stage waterproof sealing assembly for DC motors suitable for marine unmanned equipment. Background Technology

[0002] With the rapid development of marine resource exploration and development, marine environmental monitoring, and deep-sea operations, the application scenarios of various marine unmanned equipment, such as autonomous underwater robots and unmanned surface vessels, are continuously expanding, leading to a continuous increase in market size and engineering demand. As a core component of the power system and electromechanical transmission system of marine unmanned equipment, the DC motor's operational reliability directly determines the overall operational stability and service life of the equipment. Unlike land-based operating conditions, seawater in the marine environment is highly conductive and corrosive. Once water enters the motor, it can cause an electrical short circuit, burning out the core windings and associated control circuits, resulting in permanent damage.

[0003] Currently, the sealing solutions for DC motors used in underwater applications generally adopt single-stage oil seal technology, relying on fluororubber sealing rings to complete the initial sealing at the front end of the motor; however, this type of solution still has the following technical problems in actual marine environment applications:

[0004] (1) The single-stage sealing structure lacks a secondary protection mechanism. Under long-term high-pressure seawater immersion, the seals are prone to aging and failure. There is no redundant protection mechanism, and the overall reliability decreases.

[0005] (2) For customized motors that require special applications, the cost of mold opening is high and it is difficult to match them with existing commercial motors on the market.

[0006] (3) The waterproof sealing and extension of the output shaft of most DC motors have not been fully considered in the overall sealing scheme.

[0007] Therefore, there is an urgent need for a new multi-level waterproof sealing component for DC motors suitable for marine unmanned equipment, which can make the sealing solution have the characteristics of multiple protection levels, high degree of standardization and reusability, and strong sealing reliability. Summary of the Invention

[0008] To address the aforementioned technical problems in the existing technology, the purpose of this invention is to provide a multi-level waterproof sealing assembly for DC motors suitable for marine unmanned equipment. This assembly offers a sealing solution with multiple protection levels, high standardization and reusability, and strong sealing reliability. The technical solution is as follows:

[0009] A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment includes a threaded bolt, a tail end cap, a DC motor, a main housing, a front end cap, a glide cover, and a bushing. One end of the tail end cap is fully open, and the other end has a threaded hole II, through which the threaded bolt passes and connects to the tail end cap. The rear end of the main housing is fully open, and the front end has a flange hole. The tail end cap is connected to the main housing. The DC motor passes through the flange hole at the front end of the main housing and is installed inside the main housing. One end of the front end cap is connected to the main housing, and the other end is fitted with a glide cover. One end of the glide cover has a through hole, and the other end has a flange hole. The bushing has a stepped surface inside, and the bushing passes through the through hole and flange hole of the glide cover and is fixed to the output shaft of the DC motor inside the main housing.

[0010] Furthermore, both the tail end cover and the front end cover adopt a stepped disc structure, and both the tail end cover and the front end cover have threaded holes I on the outer circumferential direction of the disc for installing tapered fastener screws, and are rigidly connected to the main housing through the tapered fastener screws. Both the tail end cover and the front end cover have stop bosses on the inner side for fitting and installing with the groove ends of the front and rear ends of the main housing.

[0011] Furthermore, the middle part of the front end cover has a stepped shaft hole structure, including three areas: a Glyd ring mounting cavity, a Glyd cover mounting cavity, and a bushing positioning cavity. The Glyd ring mounting cavity is used to place the rotating Glyd ring for the shaft, providing installation space and axial positioning for the dynamic sealing element. The surface of the Glyd cover mounting cavity is provided with a countersunk threaded hole I for installing the Glyd cover. The bushing positioning cavity is used to provide installation space for the bushing.

[0012] Furthermore, the outer surface of the front cover is also provided with stepped holes for resealing and protection by installing a rotary sealing plug.

[0013] Furthermore, the main housing has a cylindrical structure, and both the front and rear ends of the main housing are provided with sealing grooves and locking grooves, which are used to install O-ring seals and tapered fasteners, respectively.

[0014] Furthermore, the sealing groove has a rectangular cross-section, the locking groove has a semi-circular cross-section, and the depth of both the sealing groove and the locking groove does not exceed the wall thickness of the main housing.

[0015] Furthermore, the flange hole at the front end of the main housing is uniformly provided with countersunk threaded holes I along the circumferential direction. The flange hole and the countersunk threaded holes I are used to realize the axial positioning and radial centering of the DC motor and the main housing.

[0016] Furthermore, one end of the flange hole of the Gladgow is provided with a countersunk threaded hole II for installing a locking screw; threaded holes IV are provided intersectingly next to the adjacent countersunk threaded holes II for mounting the sealed assembly on the bracket.

[0017] Furthermore, the bushing is provided with a threaded hole III, and the bushing has a stepped surface inside. The bushing is fastened to the output shaft of the DC motor with a flat-bottomed tapered fastening screw, thereby extending the transmission distance of the DC motor.

[0018] Furthermore, the threaded bolt passes through the threaded hole II and is bonded to the tail cap using AB adhesive specifically designed for underwater sealing.

[0019] Beneficial effects: (1) The present invention adopts a multi-level sealing protection structure with static and dynamic sealing working together. It forms multiple protections through two independent static seals and one dynamic seal, replacing the traditional single-level oil seal sealing scheme. Even if a sealing ring is worn and leaks, the other sealing layers can still form an effective barrier, which greatly improves the sealing reliability under long-term immersion in high-pressure seawater. (2) The sealing components designed in the present invention are independent complete structures, which do not require customized modification and mold opening of the DC motor body and can be directly adapted to the mainstream DC motors on the market. The components are highly modular and the sealing elements are more convenient to maintain and replace later. (3) It can be adapted to installation scenarios with different transmission distances. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the multi-stage waterproof sealing assembly for DC motors applicable to marine unmanned equipment of the present invention.

[0021] Figure 2 This is an exploded view of the overall structure of the DC motor multi-stage waterproof sealing assembly of the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the structure of the multi-stage waterproof sealing assembly for DC motors of the present invention;

[0023] Figure 4 This is a side view of the main housing of the DC motor multi-stage waterproof sealing assembly of the present invention;

[0024] Figure 5 This is a side view of the front cover of the DC motor multi-stage waterproof sealing assembly of the present invention;

[0025] Figure 6 This is a side view of the tail end cap of the DC motor multi-stage waterproof sealing assembly of the present invention;

[0026] Figure 7 This is a Glaeger side view of the multi-stage waterproof sealing assembly for DC motors of the present invention;

[0027] Figure 8 This is a side view of the bushing of the multi-stage waterproof sealing assembly for DC motors according to the present invention.

[0028] The meanings of the labels in the attached figures are as follows: 1-Threading bolt, 2-Tail end cap, 3-Tapered fastener screw, 4-Main housing, 5-Front end cap, 6-Rotary seal plug, 7-Locking screw, 8-Gledgren's cap, 9-Shaft sleeve, 10-Stepped hole, 11-Flange hole, 12-Sealing groove, 13-Locking groove, 14-Counterhead threaded hole I, 15-Gledgren's cap mounting cavity, 16-Gledgren's ring mounting cavity, 17-Threaded hole I, 18-Threaded hole II, 19-Threaded hole III, 20-Counterhead threaded hole II, 21-Threaded hole IV, 22-O-ring seal, 23-Rotary Gledgren's ring, 24-DC motor, 25-Flat-bottomed fastener screw, 26-Shaft sleeve positioning cavity. Detailed Implementation

[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] like Figures 1-3 As shown, the present invention provides a multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment, comprising a threading bolt 1, a tail end cover 2, a DC motor 24, a main housing 4, a front end cover 5, a glide cover 8, and a bushing 9.

[0031] like Figure 4 As shown, the main housing 4 is a cylindrical structure. A flange hole 11 is provided at the front end of the main housing 4, and countersunk threaded holes I14 are evenly spaced along the circumference of the flange hole 11. The flange hole 11 and the countersunk threaded holes I14 are used to achieve axial positioning and radial centering of the DC motor 24 and the main housing 4. The rear end of the main housing 4 is fully open for inserting the DC motor 24. After passing through the flange hole 11 at the front end of the main housing 4, the DC motor 24 can be fixedly installed inside the main housing 4 by locking screws 7.

[0032] The front and rear ends of the main housing 4 are provided with two sealing grooves 12 and one locking groove 13, which are used to install O-ring seals 22 and tapered fasteners 3, respectively. The sealing groove 12 has a rectangular cross-section, and the locking groove 13 has a semi-circular cross-section. The depth of both the sealing groove 12 and the locking groove 13 does not exceed the wall thickness of the main housing 4.

[0033] like Figure 6As shown, the tail cap 2 adopts a stepped disc structure, serving as a channel connecting the DC motor 24 to the external environment, and simultaneously cooperating with the main housing 4 to achieve a static seal. One end of the tail cap 2 is fully open, and the other end has a threaded hole II18 for accommodating the threaded bolt 1. The threaded bolt 1 passes through the threaded hole II18 and needs to be bonded to the tail cap 2 with AB glue specifically designed for underwater sealing. The outer side of the tail cap 2 has a disc structure with threaded holes I17 along the circumference for installing tapered fastener screws 3, achieving a rigid connection with the main housing 4 through the tapered fastener screws 3. The inner side of the tail cap 2 has a stop boss for fitting and installing with the grooved ends of the front and rear ends of the main housing 4.

[0034] like Figure 5 As shown, the front cover 5 adopts a stepped disc structure. Threaded holes I17 are provided on the outer circumference of the disc for installing tapered fasteners 3, which are rigidly connected to the main housing 4 through the tapered fasteners 3. The inner side of the front cover 5 is provided with a stop boss for fitting and installing with the groove ends of the front and rear ends of the main housing 4.

[0035] One end of the front cover 5 is connected to the front end of the main housing 4, and the other end is fitted with a glyph 8. The middle part of the front cover 5 has a stepped shaft hole structure, including three areas: a glyph mounting cavity 15, a glyph ring mounting cavity 16, and a bushing positioning cavity 26. The glyph ring mounting cavity 16 is used to place the rotating glyph 23 for the shaft, providing installation space and axial positioning for the dynamic sealing element. The surface of the glyph mounting cavity 15 is provided with a countersunk threaded hole I14 for installing the glyph 8, thereby pressing the rotating glyph 23. The bushing positioning cavity 26 is used to provide installation space for the bushing 9.

[0036] like Figure 7 As shown, the cover 8 has a through hole at one end and a flange hole 11 at the other end, allowing the bushing 9 to be inserted and installed. The flange hole 11 has an end face, which is designed to axially position the bushing 9 and prevent it from loosening. One end of the cover 8 with the flange hole 11 is provided with a countersunk threaded hole II 20 for installing a locking screw 7; adjacent to the countersunk threaded holes II 20, there are intersecting threaded holes IV 21 for mounting the fully sealed assembly onto the bracket.

[0037] like Figure 8 As shown, the bushing 9 is provided with a threaded hole Ⅲ19. Meanwhile, considering that the output shaft of most DC motors 24 is not a smooth shaft, a stepped surface is provided inside the bushing 9. The bushing 9 passes through the through hole and flange hole 11 of the cover 8 and is fixed to the output shaft of the DC motor 24 inside the main housing 4 by locking screws 7, thereby extending the transmission distance of the DC motor 24.

[0038] In addition, the coaxiality of the shaft hole of the front cover 5 needs to be controlled within a certain range to provide precision assurance for the low-friction rotation and dynamic sealing of the bushing 9. In order to install the flat-bottomed fastener screw 25, a stepped hole 10 is provided on the outer circumference of the front cover 5 for installing the rotary seal plug 6 for secondary sealing protection.

[0039] The installation principle of the multi-stage waterproof sealing assembly for DC motors applicable to marine unmanned equipment of the present invention is as follows:

[0040] First, insert the output shaft of the DC motor 24 into the flange hole 11 of the main housing 4, and then tighten the two together with the locking screws 7. According to the double-layer sealing grooves 12 at the front and rear ends of the main housing 4, select appropriate O-rings 22 according to the dimensions specified by national standards, apply special grease to the four O-rings 22 and then install them into the sealing grooves 12 at both ends.

[0041] The threaded bolt 1 is assembled with the tail cap 2 through the threaded hole, completing the wiring between the DC motor 24 and the extension cable. Epoxy resin AB glue is used to balance the mixture according to the ratio and then fully seal the interface of the threaded bolt 1. The rotating glyph 23 is coated with special grease and then assembled into the glyph mounting cavity 16 of the front cap 5. The glyph 8 is then assembled into the glyph mounting cavity 15 of the front cap 5 using the locking screw 7 to press the rotating glyph 23. The modularly assembled tail cap 2 and front cap 5 are then assembled onto the main housing 4. Specifically, grease is applied to the inner stepped surfaces of both the tail cap 2 and the front cap 5, and both press the O-rings on the main housing 4. The bushing 9 is assembled into the bushing positioning cavity 26 of the front cap 5. The bushing 9 is mounted on the output shaft of the DC motor 24 using the flat-bottomed fastening screw 25, which is tightened through the stepped hole 10 on the outer circumference of the front cap 5 to ensure complete torque transmission. The tapered screws are fitted into the threaded holes I17 on the outer side of the stepped discs of the front cover 5 and the tail cover 2 to achieve a complete fastening connection of the components.

[0042] After the component is installed, it is first manually rotated to test and ensure that the shaft rotation resistance is uniform, there is no jamming or uneven wear, and there are no gaps or looseness at the seals. Then, the fully sealed component is installed on the bracket that needs to transmit power.

Claims

1. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment, comprising a threading bolt (1), a tail end cap (2), a DC motor (24), a main housing (4), a front end cap (5), a glide cover (8), and a bushing (9); characterized in that, The tail cap (2) is fully open at one end and has a threaded hole II (18) at the other end. The threaded bolt (1) passes through the threaded hole II (18) and is connected to the tail cap (2). The rear end of the main housing (4) is fully open and has a flange hole (11) at the front end. The tail cap (2) is connected to the main housing (4). The DC motor (24) passes through the flange hole (11) at the front end of the main housing (4) and is installed inside the main housing (4). The front cap (5) is connected to the main housing (4) at one end and has a glyph cover (8) at the other end. The glyph cover (8) has a through hole at one end and a flange hole (11) at the other end. The bushing (9) has a stepped surface inside. The bushing (9) passes through the through hole and flange hole (11) of the glyph cover (8) and is fixed to the output shaft of the DC motor (24) inside the main housing (4).

2. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, Both the tail end cap (2) and the front end cap (5) adopt a stepped disc structure, and both the tail end cap (2) and the front end cap (5) have threaded holes I (17) on the outer circumferential direction of the disc for installing tapered fasteners (3), and are rigidly connected to the main housing (4) through the tapered fasteners (3). Both the tail end cap (2) and the front end cap (5) have stop bosses on the inner side for fitting and installing with the slots at the front and rear ends of the main housing (4).

3. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The middle part of the front cover (5) is a stepped shaft hole structure, including three areas: the glyd ring mounting cavity (16), the glyd cover mounting cavity (15), and the bushing positioning cavity (26). The glyd ring mounting cavity (16) is used to place the rotating glyd ring (23) for the shaft, providing installation space and axial positioning for the dynamic sealing element. The surface of the glyd cover mounting cavity (15) is provided with a countersunk threaded hole I (14) for installing the glyd cover (8). The bushing positioning cavity (26) is used to provide installation space for the bushing (9).

4. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1 or 3, characterized in that, The front cover (5) is also provided with a stepped hole (10) on its outer surface for resealing and protection by installing a rotary sealing plug (6).

5. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The main housing (4) is a cylindrical structure. The front end and rear end of the main housing (4) are provided with sealing grooves (12) and locking grooves (13), which are used to install O-ring seals (22) and tapered fasteners (3), respectively.

6. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 5, characterized in that, The sealing groove (12) has a rectangular cross-section, and the locking groove (13) has a semi-circular cross-section. The depths of both the sealing groove (12) and the locking groove (13) do not exceed the wall thickness of the main housing (4).

7. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The flange hole (11) at the front end of the main housing (4) is uniformly provided with countersunk threaded holes I (14) along the circumferential direction. The flange hole (11) and the countersunk threaded holes I (14) are used to realize the axial positioning and radial centering of the DC motor and the main housing (4).

8. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The Gladget (8) has a countersunk threaded hole II (20) at one end of the flange hole (11) for installing a locking screw (7); and threaded holes IV (21) are provided at the intersection of the adjacent countersunk threaded holes II (20) for installing the sealed assembly on the bracket.

9. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The bushing (9) is provided with a threaded hole Ⅲ (19) and the bushing (9) has a stepped surface inside. The bushing (9) is fastened to the output shaft of the DC motor (24) with a flat-bottomed fastening screw (25) to extend the transmission distance of the DC motor (24).

10. A multi-stage waterproof sealing assembly for a DC motor suitable for marine unmanned equipment according to claim 1, characterized in that, The threaded bolt (1) passes through the threaded hole II (18) and is bonded to the tail cap (2) by AB glue specifically for underwater sealing.

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