Underwater motor sealing device

Abstract

The present invention relates to the technical field of underwater motors, and specifically to an underwater motor sealing device, comprising a motor housing, a rear cover is provided at one end of the motor housing, a front cover is provided at one end of the motor housing away from the rear cover, a stator and a rotor are provided inside the motor housing, a trigger assembly is provided on the motor housing, a central axis is provided in the middle of the rotor, the central axis is rotatably connected to the rear cover, a sealing assembly is slidably connected to the central axis, a sealing cover is provided at one end of the motor housing away from the front cover, the sealing assembly comprises a connecting plate, and a first elastic member is provided on the connecting plate. The beneficial effects of the present invention are as follows: when used underwater, the pressure difference between the inside and outside of the motor housing is reduced, and water leakage caused by a large pressure difference between the inside and outside of the motor housing is avoided. At the same time, the sealing effect can be adaptively improved according to the different underwater depths and water pressures of the underwater motor. The deeper the underwater depth and the greater the water pressure, the stronger the sealing effect.

Description

Technical Field

[0001] The invention relates to the technical field of underwater motors, and in particular to an underwater motor sealing device. Background Art

[0002] The seals of underwater motors are divided into static seals and dynamic seals. Static seals refer to the seals between the housing and the end cover, usually by adding an O-ring. Dynamic seals refer to the seals for the rotational motion of the motor output shaft. When the motor is running, as long as the motor output shaft rotates, there will be a gap between it and the housing. In addition, when the motor output shaft rotates at high speed, the seal ring between the motor output shaft and the housing will wear, heat up, or even deform, and it will easily leak under high water pressure.

[0003] A dynamic sealing device for an underwater motor disclosed in Chinese patent CN220629031U includes a motor mounting seat, a motor is fixed on the motor mounting seat, a sealing housing is sealed at one end of the motor mounting seat, a sealing gland is sealed at the other end of the motor mounting seat, a motor output shaft extends out of the motor mounting seat and the sealing gland, and a skeleton oil seal and a Gly ring sealing assembly are sequentially arranged along the extending direction of the motor output shaft.

[0004] However, compared with the prior art and the comparative scheme, it can be seen that the dynamic sealing device of the underwater motor still has the following problems during actual use:

[0005] The deeper the underwater motor is, the greater the pressure difference between the inside and outside of the casing will be due to the water pressure. When the motor is running, the sealing ring between the motor output shaft and the casing will not only be subjected to the water pressure in the axial direction of the motor output shaft due to the pressure difference between the inside and outside of the casing, but will also be subjected to the friction force on the circumference of the motor output shaft generated by the relative movement of the motor output shaft with the casing during rotation. This makes it more likely that the sealing ring will be deformed, and water leakage will occur. Summary of the invention

[0006] The present invention provides an underwater motor sealing device to solve the above technical problems.

[0007] An underwater motor sealing device of the present invention adopts the following technical scheme: comprising a motor housing, a rear cover is arranged at one end of the motor housing, a front cover is arranged at the end of the motor housing away from the rear cover, a stator and a rotor are arranged inside the motor housing, a trigger assembly is arranged on the motor housing, a central shaft is arranged in the middle of the rotor, the central shaft is rotatably connected to the rear cover, a sealing assembly is slidably connected to the central shaft, and a sealing cover is arranged at the end of the motor housing away from the front cover;

[0008] The sealing assembly includes a connecting disk, a first elastic member is arranged on the connecting disk, a sealing disk is arranged at one end of the first elastic member away from the connecting disk, a first spline shaft is arranged on one side of the sealing disk, and a second spline shaft is arranged at one end of the sealing disk away from the first spline shaft;

[0009] The sealing disk is provided with a second conical surface, and the sealing disk is provided with a receiving groove, wherein a second elastic member and a second ball are provided inside the receiving groove.

[0010] Furthermore, a connecting groove is provided on the motor housing, and a hollow cover is provided on the motor housing.

[0011] Furthermore, a bearing is provided on the front cover, and the front cover is rotatably connected to the output shaft through the bearing. A first spline groove is provided at one end of the output shaft, a skeleton oil seal is provided between the front cover and the output shaft, a slot is provided on the front cover, the sealing disk is adapted to the slot, and a first conical surface and an O-ring are provided inside the slot.

[0012] Furthermore, the trigger assembly includes a connecting piece, a piston is arranged on the connecting piece, the piston is slidably connected in the connecting groove, and a first ball is arranged at one end of the connecting piece.

[0013] Furthermore, a limiting ring is arranged at one end of the central shaft, and a second spline groove is arranged at one end of the central shaft close to the limiting ring.

[0014] Furthermore, the connecting disk includes two limiting plates and a third conical surface sandwiched between the two limiting plates, and the first ball is in contact with the third conical surface on the connecting disk.

[0015] Furthermore, the first spline shaft is slidably connected to the output shaft via the first spline groove.

[0016] Furthermore, the second spline shaft is slidably connected to the central shaft via the second spline groove.

[0017] Furthermore, the taper of the second conical surface is greater than the taper of the first conical surface, and the O-ring is arranged between the first conical surface and the second conical surface.

[0018] Furthermore, there are multiple receiving grooves, and the multiple receiving grooves are distributed on the sealing disk in a circular array.

[0019] The beneficial effects of the present invention are as follows: when used underwater, the pressure difference between the inside and outside of the motor housing is reduced, thereby avoiding water leakage caused by a large pressure difference between the inside and outside of the motor housing. At the same time, the sealing effect can be adaptively improved according to the different underwater depths and water pressures of the underwater motor. The deeper the underwater depth and the greater the water pressure, the stronger the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0022] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of the present invention;

[0023] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0024] Figure 4 is a schematic cross-sectional structural diagram of a first state of an embodiment of the present invention;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure enlarged at B in the middle;

[0026] Figure 6 is a schematic cross-sectional structural diagram of a second state of an embodiment of the present invention;

[0027] Figure 7 for Figure 6 A schematic diagram of the structure enlarged at C in the middle;

[0028] Figure 8 It is a schematic cross-sectional structural diagram of a front cover of an embodiment of the present invention;

[0029] Fig. 9 for Figure 8 A schematic diagram of the structure at D in the middle is enlarged;

[0030] Fig.10 A schematic diagram of the structure of a trigger component according to an embodiment of the present invention;

[0031] Fig.11 It is a schematic diagram of a partial cross-sectional structure of a shaft in an embodiment of the present invention;

[0032] Fig.12 is a schematic cross-sectional structural diagram of a sealing assembly according to an embodiment of the present invention;

[0033] Fig.13 for Fig.12 Enlarged schematic diagram of the structure at E in the middle.

[0034] In the figure: 1. motor housing; 101. connecting groove; 102. hollow cover; 2. rear cover; 3. front cover; 301. bearing; 302. output shaft; 303. first spline groove; 304. skeleton oil seal; 305. slot; 306. first cone surface; 307. O-ring; 4. stator; 5. rotor; 6. trigger assembly; 601. connecting piece; 602. piston; 603. first ball; 7. middle shaft; 701. limit ring; 702. second spline groove; 8. sealing assembly; 81. connecting disk; 82. first elastic member; 83. sealing disk; 831. second cone surface; 832. receiving groove; 833. second elastic member; 834. second ball; 84. first spline shaft; 85. second spline shaft; 9. sealing cover. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] An embodiment of an underwater motor sealing device of the present invention is as follows Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, it comprises a motor housing 1, a rear cover 2 is arranged at one end of the motor housing 1, a front cover 3 is arranged at the end of the motor housing 1 away from the rear cover 2, a stator 4 and a rotor 5 are arranged inside the motor housing 1, a trigger assembly 6 is arranged on the motor housing 1, the number of the trigger assemblies 6 is multiple, and the multiple trigger assemblies 6 are distributed in a circular array on the motor housing 1, a central axis 7 is arranged in the middle of the rotor 5, the central axis 7 is rotatably connected to the rear cover 2, a sealing assembly 8 is slidably connected to the central axis 7, and a sealing cover 9 is arranged at the end of the motor housing 1 away from the front cover 3;

[0037] like Figures 2 to 3 As shown, a connection groove 101 is provided on the motor housing 1, and a hollow cover 102 is provided on the motor housing 1. In this embodiment, the hollow cover 102 is threadedly connected to a position on the motor housing 1 corresponding to the connection groove 101;

[0038] like Figures 8 to 9 As shown, a bearing 301 is provided on the front cover 3, and the front cover 3 is rotatably connected to the output shaft 302 through the bearing 301. A first spline groove 303 is provided at one end of the output shaft 302, and a skeleton oil seal 304 is provided between the front cover 3 and the output shaft 302. A slot 305 is provided on the front cover 3, and a first cone surface 306 and an O-ring 307 are provided inside the slot 305;

[0039] like Figure 3 and Fig.10 As shown, the trigger assembly 6 includes a connecting member 601, a piston 602 and a first ball 603. The connecting member 601 is provided with a piston 602, the piston 602 is slidably connected in the connecting groove 101, and one end of the connecting member 601 is provided with a first ball 603;

[0040] like Figure 4 , Figure 6 and Fig.11 As shown, a limiting ring 701 is provided at one end of the central shaft 7. In this embodiment, the limiting ring 701 is threadedly connected to one end of the central shaft 7, and a second spline groove 702 is provided at one end of the central shaft 7 close to the limiting ring 701;

[0041] like Figures 2 to 7 , Figure 12 to Figure 13 As shown, the sealing assembly 8 includes a connecting disk 81, a first elastic member 82, a sealing disk 83, a first spline shaft 84 and a second spline shaft 85. The connecting disk 81 includes two limit plates and a third cone surface sandwiched between the two limit plates. The first ball 603 contacts the third cone surface on the connecting disk 81. The connecting disk 81 is provided with a first elastic member 82. The end of the first elastic member 82 away from the connecting disk 81 is provided with a sealing disk 83. The sealing disk 83 is adapted to the slot 305. A first spline shaft 84 is provided on one side of the sealing disk 83. The first spline shaft 84 is slidably connected to the output shaft 302 through the first spline groove 303. The end of the sealing disk 83 away from the first spline shaft 84 is provided with a second spline shaft 85. The second spline shaft 85 is slidably connected to the middle shaft 7 through the second spline groove 702.

[0042] like Figure 5 , Figure 7 and Fig.13 As shown, a second conical surface 831 is provided on the sealing disk 83, and the taper of the second conical surface 831 is greater than the taper of the first conical surface 306. The O-ring 307 is arranged between the first conical surface 306 and the second conical surface 831. A receiving groove 832 is opened on the sealing disk 83. There are multiple receiving grooves 832, and the multiple receiving grooves 832 are distributed in a circular array on the sealing disk 83. A second elastic member 833 and a second ball 834 are arranged inside the receiving groove 832.

[0043] The working process is as follows:

[0044] S1. When used underwater, as the underwater motor descends, the water pressure gradually increases. When the pressure outside the motor housing 1 is greater than the pressure inside the motor housing 1, the water pressure pushes the piston 602, causing the piston 602 to move in the connecting groove 101 toward the inside of the motor housing 1.

[0045] S2, the piston 602 drives the first ball 603 to move through the connecting piece 601, and the first ball 603 moves on the third cone surface of the connecting plate 81, pushing the connecting plate 81 to move toward the front cover 3, and the connecting plate 81 pushes the sealing plate 83 through the first elastic member 82, so that the sealing plate 83 and the front cover 3 are more tightly connected;

[0046] S3, at this time, the second elastic member 833 contracts, the second ball 834 is received in the receiving groove 832, and the annular groove formed by the first conical surface 306 and the second conical surface 831 cooperates with the O-ring 307 to improve the sealing effect. Figures 4 to 7 shown);

[0047] S4. When the external water pressure is high and some water infiltrates from the skeleton oil seal 304, the infiltrated water pushes the O-ring 307 toward the junction of the first cone surface 306 and the second cone surface 831. As the space becomes smaller, the O-ring 307 is compressed, thereby further improving the sealing effect between the sealing disk 83 and the front cover 3, and avoiding water leakage or water seepage at the output shaft 302.

[0048] S5. As the water pressure outside the motor housing 1 increases, the portion of the trigger assembly 6 that enters the motor housing 1 increases. As the piston 602 moves, the pressure inside the motor housing 1 also increases, thereby reducing the pressure difference between the inside and outside of the motor housing 1, thereby avoiding water leakage caused by the large pressure difference between the inside and outside of the motor housing 1.

[0049] S6. The greater the water pressure, the more the trigger assembly 6 enters the interior of the motor housing 1, the greater the displacement of the connecting plate 81, the greater the thrust exerted on the first elastic member 82, and the elastic force of the first elastic member 82 and the displacement of the connecting plate 81 make the sealing effect between the sealing plate 83 and the front cover 3 greater.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An underwater motor sealing device, characterized in that: The motor housing comprises a motor housing, a rear cover is arranged at one end of the motor housing, a front cover is arranged at one end of the motor housing away from the rear cover, a stator and a rotor are arranged inside the motor housing, a trigger assembly is arranged on the motor housing, a central shaft is arranged in the middle of the rotor, the central shaft is rotatably connected to the rear cover, a sealing assembly is slidably connected to the central shaft, and a sealing cover is arranged at one end of the motor housing away from the front cover; The sealing assembly comprises a connecting disk, a first elastic member is arranged on the connecting disk, a sealing disk is arranged at one end of the first elastic member away from the connecting disk, a first spline shaft is arranged at one side of the sealing disk, and a second spline shaft is arranged at one end of the sealing disk away from the first spline shaft; The sealing disk is provided with a second conical surface, the sealing disk is provided with a receiving groove, and the receiving groove is provided with a second elastic member and a second ball; The front cover is provided with a bearing, the front cover is rotatably connected to the output shaft through the bearing, one end of the output shaft is provided with a first spline groove, a skeleton oil seal is provided between the front cover and the output shaft, a slot is provided on the front cover, the sealing disk is adapted to the slot, and a first conical surface and an O-ring are provided inside the slot; The trigger assembly comprises a connecting member, a piston is arranged on the connecting member, the piston is slidably connected in the connecting groove, and a first ball is arranged at one end of the connecting member; The connecting plate comprises two limiting plates and a third conical surface sandwiched between the two limiting plates, and the first ball is in contact with the third conical surface on the connecting plate; The taper of the second conical surface is greater than that of the first conical surface, and the O-ring is arranged between the first conical surface and the second conical surface.

2. An underwater motor sealing device according to claim 1, characterized in that: A connecting groove is provided on the motor housing, and a hollow cover is provided on the motor housing.

3. The underwater motor sealing device according to claim 1, characterized in that: A limiting ring is arranged at one end of the central shaft, and a second spline groove is arranged at one end of the central shaft close to the limiting ring.

4. The underwater motor sealing device according to claim 1, characterized in that: The first spline shaft is slidably connected to the output shaft via the first spline groove.

5. The underwater motor sealing device according to claim 3, characterized in that: The second spline shaft is slidably connected to the central shaft via the second spline groove.

6. The underwater motor sealing device according to claim 1, characterized in that: The number of the receiving grooves is multiple, and the multiple receiving grooves are distributed in a circular array on the sealing disk.

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