A rotary sealing device

Abstract

The present invention discloses a rotary sealing device, which belongs to the technical field of equipment such as photoelectric and ball cameras that are relatively rotating on high-speed mobile carrier platforms for sea and river transportation, and includes a friction ring A, a retaining ring A, a friction ring B, a retaining ring B, a friction ring and a sealing ring; the friction ring A, the friction ring B and the friction ring are arranged on the azimuth housing in sequence from the outside to the inside; the retaining ring A, the retaining ring B and the sealing ring are arranged on the azimuth flange in sequence from the outside to the inside; the retaining ring A abuts against the friction ring A to form a first-level waterproof structure; the retaining ring B abuts against the friction ring B to form a second-level waterproof structure; the sealing ring and the friction ring are frictionally matched to form a third-level waterproof structure. The present invention realizes waterproof sealing during high-speed movement through a three-level waterproof structure, and solves the problem of water retention inside the equipment and the problem of large friction of the waterproof sealing device, thereby reducing the space required for the rotary sealing device and ensuring the long-term use of the rotary sealing device.

Description

Technical Field

[0001] The present invention belongs to the technical field of equipment such as photoelectric devices and ball cameras that are relatively rotating on high-speed mobile carrier platforms for sea and river transportation, and specifically relates to a rotary sealing device. Background Art

[0002] Relative rotating equipment on sea or river transport carriers, such as optoelectronic equipment and ball camera equipment, is more susceptible to the intrusion of seawater or river water (hereinafter referred to as water flow) than relatively stationary equipment due to the existence of rotating gaps, causing corrosion or damage to the equipment. In addition, on high-speed sea or river transport carriers (such as small speedboats), due to the increase in wind pressure, water pressure and other pressures, seawater or river water hits the product more forcefully, making the intrusion of water flow more serious. Therefore, relatively rotating equipment on high-speed sea or river transport carriers needs to meet higher waterproof sealing requirements to ensure that the equipment can complete its respective functions through rotation.

[0003] In order to meet the waterproof sealing performance of the relatively rotating equipment on the high-speed mobile carrier, a waterproof sealing device is usually set in the relatively rotating gap in the equipment. The devices are roughly divided into two categories: one is used to prevent the equipment from being rained on, that is, it can prevent rainwater from entering the equipment from top to bottom; the other is to set a sealing ring in the rotating gap, and prevent the water flow from scouring the equipment through the sealing effect of the sealing ring, that is, to prevent the water flow from rebounding through the planar structure such as the deck and entering the equipment from bottom to top. However, both methods currently have limitations: the limitation of the first type is that in order to prevent the water flow from entering from bottom to top, the equipment needs to be fixed at a high place, but this method causes the equipment to be highly prominent, which does not meet the requirements of concealment and stealth; the limitation of the second type is that there is a large friction between the sealing ring and the equipment housing, so that the equipment needs to overcome huge friction resistance when rotating, and overcoming the friction resistance requires a high-power drive motor to overcome, which not only increases energy consumption, but also increases the size of the equipment.

[0004] At present, a three-level waterproof structure is disclosed. The three-level waterproof structure is arranged in the gap between the azimuth flange and the azimuth shell, wherein the first-level waterproof structure realizes waterproofing by moving the slices up and down with the surge impact, the second-level waterproof structure reduces the impact pressure of part of the water by setting the height difference between the annular boss and the annular groove, and the third-level waterproof structure blocks the entry of the remaining small part of the water by the friction fit between the graphite ring and the friction ring. However, in the three-level waterproof structure, the way of moving the slices by surge impact is easy to fail. The annular groove of the second-level waterproof structure and the groove with the friction ring in the third-level waterproof structure are easy to cause water stagnation, which is easy to cause equipment corrosion and damage.

[0005] Therefore, a rotary sealing device is needed that can ensure waterproof performance, reduce friction resistance, avoid corrosion and damage caused by water retention inside the equipment, and ensure the long-term use of the rotary sealing device. Summary of the invention

[0006] In view of this, the present invention provides a rotary sealing device, which realizes waterproof sealing during high-speed movement through a three-level waterproof structure, and solves the problem of water retention inside the equipment and the problem of large friction of the waterproof sealing device, thereby reducing the space required for the rotary sealing device while ensuring the long-term use of the rotary sealing device.

[0007] The present invention is achieved through the following technical solutions:

[0008] A rotary sealing device is arranged in the gap between the azimuth flange and the azimuth housing which are relatively rotating;

[0009] Including: friction ring A, retaining ring A, friction ring B, retaining ring B, friction ring and sealing ring;

[0010] The friction ring A, friction ring B and friction ring are arranged on the azimuth housing in sequence from outside to inside;

[0011] The retaining ring A, retaining ring B and sealing ring are arranged on the azimuth flange in sequence from outside to inside;

[0012] The retaining ring A abuts against the friction ring A to form a first-level waterproof structure;

[0013] The retaining ring B abuts against the friction ring B to form a second-level waterproof structure;

[0014] The sealing ring and the friction ring are friction-matched to form a third-level waterproof structure;

[0015] The contact surface between the friction ring B and the retaining ring B is higher than the contact surface between the friction ring A and the retaining ring A; the upper end surface of the friction ring is higher than the contact surface between the friction ring B and the retaining ring B.

[0016] Furthermore, an annular boss A extends downward from the front side of the lower end of the retaining ring A; the lower end surface of the annular boss A abuts against the upper end surface of the friction ring A.

[0017] Furthermore, the first-level waterproof structure further includes: a support ring A;

[0018] The retaining ring A is pressed against the lower end surface of the azimuth flange through the support ring A.

[0019] Furthermore, the friction ring A is divided into a fixed area a and a suspended area a;

[0020] The fixed area a and the suspended area a are both annular structures, and the suspended area a is located at the periphery of the fixed area a;

[0021] The azimuth housing comprises: an inclined portion a which is higher inside and lower outside and a horizontal portion a, and the highest point of the inclined portion a is connected to the outer periphery of the horizontal portion a;

[0022] The fixed area a of the friction ring A is fixedly connected to the horizontal part a of the azimuth shell, and the suspended area a is located above the inclined part a of the azimuth shell;

[0023] The annular boss A of the retaining ring A abuts against the upper end surface of the suspended area a of the friction ring A.

[0024] Furthermore, the second-level waterproof structure further includes: a cushion block;

[0025] The pad is an annular structure and is coaxially fixed to the horizontal portion a of the azimuth housing;

[0026] The outer circumference of the cushion block has a shoulder a, and the upper end surface of the cushion block includes: an inclined portion b which is higher inside and lower outside, and a horizontal portion b;

[0027] The fixing area a of the friction ring A is pressed against the horizontal part a of the azimuth housing through the shoulder a;

[0028] The friction ring B is mounted on the horizontal portion b of the pad.

[0029] Furthermore, the friction ring B is divided into a fixed area b and a suspended area b. The fixed area b of the friction ring B is fixedly connected to the horizontal portion b of the cushion block, and the suspended area b is located above the inclined portion b of the cushion block.

[0030] Furthermore, an annular boss B extends downward from the front side of the lower end face of the retaining ring B; the lower end face of the annular boss B abuts against the upper end face of the suspended area b of the friction ring B.

[0031] Furthermore, the second-level waterproof structure further includes: a support ring B;

[0032] The retaining ring B is pressed against the lower end surface of the azimuth flange through the support ring B.

[0033] Furthermore, the outer circumference of the friction ring has a shoulder b;

[0034] The fixed area b of the friction ring B is pressed against the horizontal part b of the pad through the shaft shoulder b;

[0035] The sealing ring is pressed against the lower end surface of the azimuth flange plate through a clamping ring.

[0036] Furthermore, it is characterized in that the friction ring A, the retaining ring A, the friction ring B and the retaining ring B are all made of self-lubricating plastic material.

[0037] Beneficial effects:

[0038] (1) In a rotary sealing device of the present invention, retaining ring A abuts against friction ring A to form a first-level waterproof structure, retaining ring B abuts against friction ring B to form a second-level waterproof structure, and the sealing ring and the friction ring cooperate with each other to form a third-level waterproof structure. The first-level waterproof structure and the second-level waterproof structure can block all water flows except water vapor, thereby reducing the friction resistance required in the third-level waterproof structure. At the same time, the contact surface between friction ring B and retaining ring B is higher than the contact surface between friction ring A and retaining ring A, and the upper end surface of the friction ring is higher than the contact surface between friction ring B and retaining ring B, which can avoid water flow retention in the device, avoid corrosion and damage caused by water flow retention, and ensure the long-term use of the rotary sealing device.

[0039] (2) In a rotary sealing device of the present invention, an annular boss A extends downward from the front side of the lower end of the retaining ring A to reduce the friction area, thereby further reducing the friction resistance between the retaining ring A and the friction ring A.

[0040] (3) In a rotary sealing device of the present invention, the retaining ring A is pressed against the lower end surface of the azimuth flange by the support ring A, which can ensure that there is no gap between the retaining ring A and the azimuth flange, further avoiding corrosion and damage to the rotary sealing device caused by water retention.

[0041] (4) In a rotary sealing device of the present invention, the suspended area a of the friction ring A is located above the inclined surface a of the azimuth shell, and the annular boss A of the retaining ring A is against the upper end surface of the suspended area a of the friction ring A, which can avoid excessive squeezing of the retaining ring A on the friction ring A due to processing errors or measurement errors, thereby alleviating the friction resistance between the retaining ring A and the friction ring A.

[0042] (5) A rotary sealing device of the present invention has an inclined portion a of an azimuth shell with a structure that is higher inside and lower outside, so that water can flow out through the inclined portion, thereby avoiding water retention; the fixed area a of the friction ring A is pressed against the horizontal portion a of the azimuth shell by the shoulder a, which can ensure that there is no gap between the friction ring A and the azimuth shell, further avoiding corrosion and damage to the rotary sealing device caused by water retention; the friction ring B is installed on the horizontal portion b of the gasket, so that the contact surface between the friction ring B and the retaining ring B is higher than the contact surface between the friction ring A and the retaining ring A, which is beneficial to improving the waterproof effect.

[0043] (6) In a rotary sealing device of the present invention, the suspended area b of the friction ring B is located above the inclined portion b of the pad, which can avoid excessive squeezing of the friction ring B by the retaining ring B due to processing errors or measurement errors, thereby alleviating the friction resistance between the retaining ring B and the friction ring B.

[0044] (7) In a rotary sealing device of the present invention, an annular boss B extends downward from the front side of the lower end face of the retaining ring B, and the lower end face of the annular boss B abuts against the upper end face of the suspended area b of the friction ring B, which can reduce the friction area, thereby further reducing the friction resistance between the retaining ring A and the friction ring A.

[0045] (8) In a rotary sealing device of the present invention, the retaining ring B is pressed against the lower end surface of the azimuth flange by the support ring B, which can ensure that there is no gap between the retaining ring B and the azimuth flange, further avoiding corrosion and damage to the rotary sealing device caused by water retention.

[0046] (9) In a rotary sealing device of the present invention, the fixed area b of the friction ring B is pressed against the horizontal part b of the gasket by the shaft shoulder b, which can ensure that there is no gap between the friction ring B and the gasket, and further avoid corrosion and damage to the rotary sealing device caused by water retention.

[0047] (10) In a rotary sealing device of the present invention, retaining ring A, retaining ring B, friction ring A and friction ring B are made of self-lubricating plastic material, which can reduce the friction resistance caused by the first-level waterproof structure and the second-level waterproof structure, and effectively reduce the friction resistance required for waterproofing, thereby reducing the energy consumption required for the rotary sealing device, and can reduce the space occupied by the relatively rotating equipment while ensuring the waterproof sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the structure of the present invention;

[0049] Figure 2 It is an enlarged view A of the structural composition of the present invention;

[0050] Figure 3 It is an enlarged view B of the structural composition of the present invention;

[0051] Among them, 1-friction ring A, 2-retaining ring A, 3-friction ring B, 4-retaining ring B, 5-friction ring, 6-sealing ring, 7-azimuth flange, 701-inclined portion a, 702-horizontal portion a, 8-bearing, 9-motor, 10-azimuth housing, 11-support ring A, 12-support ring B, 13-pad, 1301-inclined portion b, 1302-horizontal portion b, 14-clamping ring. DETAILED DESCRIPTION

[0052] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0053] This embodiment provides a rotary sealing device, which adopts a three-level waterproof structure to gradually weaken the impact force generated by sea water or river water during high-speed movement, thereby achieving a waterproof sealing effect.

[0054] like Figure 1As shown, the rotary sealing device is arranged in the rotation gap of relatively rotating equipment on a sea or river transport vehicle, such as between the azimuth flange 7 and the azimuth shell 10 of the optoelectronic detection optical cabin of an unmanned ultra-high-speed ship.

[0055] The relatively rotating equipment includes: an azimuth flange 7, a bearing 8, a motor 9 and an azimuth housing 10.

[0056] The azimuth housing 10 is fixedly connected to the stator of the motor 9, and the azimuth flange 7 is fixedly connected to the rotor of the motor 9. The azimuth housing 10 and the azimuth flange 7 are supported by the bearing 8 and can rotate relative to each other. The disk surface of the azimuth flange 7 is located on the upper end surface of the azimuth housing 10, and a gap is formed between the two. Figure 3 As shown, the upper end surface of the azimuth housing 10 includes: an inclined portion a701 with a high inner side and a low outer side and a horizontal portion a702, and the highest point of the inclined portion a701 is connected to the outer periphery of the horizontal portion a702. The inclined portion a701 is used to allow the water hitting the upper end surface of the azimuth housing 10 to flow out by itself.

[0057] like Figure 2 As shown, the rotary sealing device comprises: a first-level waterproof structure, a second-level waterproof structure and a third-level waterproof structure. The first-level waterproof structure, the second-level waterproof structure and the third-level waterproof structure are sequentially arranged in the gap from outside to inside.

[0058] The first-level waterproof structure includes: a friction ring A1, a retaining ring A2 and a support ring A11.

[0059] The friction ring A1 is coaxially fixed to the horizontal portion a702 of the azimuth shell 10. As an example, the friction ring A1 is divided into a fixed area a and a suspended area a. The fixed area a and the suspended area a are both annular structures, and the suspended area a is located outside the fixed area a. The fixed area a of the friction ring A1 is fixedly connected to the upper end surface of the azimuth shell 10. The suspended area a of the friction ring A1 is located above the inclined portion a701, that is, there is a gap between the suspended area a of the friction ring A1 and the upper end surface of the azimuth shell 10.

[0060] The retaining ring A2 is coaxially fixed to the lower end surface of the azimuth flange 7, and the retaining ring A2 rotates with the azimuth flange 7. Figure 1 An annular boss A extends downward (left side in the figure). The lower end surface of the annular boss A abuts against the upper end surface of the suspended area a of the friction ring A1. The annular boss A can reduce the friction area between the retaining ring A2 and the friction ring A1, thereby alleviating the friction resistance.

[0061] The support ring A11 is located at the lower end surface of the retaining ring A2 where the annular boss A does not extend. The support ring A11 and the retaining ring A2 are fastened to the azimuth flange 7 by fasteners. The support ring A11 presses the retaining ring A2 to the lower end surface of the azimuth flange 7, so that the upper end surface of the retaining ring A2 fits tightly with the lower end surface of the azimuth flange 7 without any gap, thereby preventing water from entering the gap and causing corrosion of the equipment, thereby ensuring the sealing performance and durability of the first-level waterproof structure. The ring width of the support ring A11 is not less than half of the ring width of the retaining ring A2.

[0062] The friction ring A1 and the retaining ring A2 are both made of self-lubricating plastic material, which can reduce the friction resistance between the retaining ring A2 and the friction ring A1. In this embodiment, the material of the retaining ring A2 and the friction ring A1 is preferably polytetrafluoroethylene, which has self-lubricating properties and can further reduce the required friction resistance. At the same time, polytetrafluoroethylene is not easy to wear, corrode, and is not easy to stick to impurities in river water or sea water, which can ensure that the friction force of the rotary sealing device is constant and can be used for a long time.

[0063] The second-level waterproof structure includes: a friction ring B3, a retaining ring B4, a support ring B12 and a cushion block 13.

[0064] The pad 13 is an annular structure, coaxially fixed to the horizontal portion a702 of the azimuth shell 10. The outer circumference of the pad 13 has a shoulder a, which presses the fixed area a of the friction ring A1 against the horizontal portion a702 of the azimuth shell 10 to maintain the flatness of the friction ring A1, so that the lower end surface of the fixed area a of the friction ring A1 fits tightly with the upper end surface of the azimuth shell 10 without any gap, thus preventing water from entering the gap and causing corrosion to the equipment. In this embodiment, the width of the shoulder a is not less than half of the ring width of the friction ring A1. Figure 3 As shown, the upper end surface of the pad 13 includes an inclined portion b1301 with a high inner side and a low outer side and a horizontal portion b1302, and the highest point of the inclined portion b1301 is connected to the outer periphery of the horizontal portion b1302. In this embodiment, the inclination angle of the inclined portion b1301 is greater than or equal to 2° and less than 90°.

[0065] The friction ring B3 is coaxially fixed on the horizontal portion b1302 of the cushion block 13. The friction ring B3 is divided into a fixed area b and a suspended area b. The fixed area b of the friction ring B3 is fixed on the horizontal portion b1302 of the cushion block 13, and the suspended area b is located on the inclined portion b1301 of the cushion block 13, that is, there is a gap between the suspended area b of the friction ring B3 and the inclined portion b1301 of the cushion block 13.

[0066] The retaining ring B4 is coaxially fixed to the lower end surface of the azimuth flange 7, and the retaining ring B4 rotates with the azimuth flange 7. An annular boss B extends downward from the front side of the lower end surface of the retaining ring B4. The lower end surface of the annular boss B abuts against the upper end surface of the suspended area b of the friction ring B3. The provision of the annular boss B can reduce the friction area between the retaining ring B4 and the friction ring B3, thereby alleviating the friction resistance. The contact surface between the friction ring A1 and the retaining ring A2 is lower than the contact surface between the friction ring B3 and the retaining ring B4, that is, a gradually ascending stepped structure is formed between the first-level waterproof structure and the second-level waterproof structure, which can effectively block the water flow from passing through the second-level waterproof structure. At the same time, the gradually ascending structure can avoid the corrosion of the azimuth flange 7 or the azimuth shell 10 caused by the retention of water flow.

[0067] The support ring B12 is located at the lower end surface of the retaining ring B4 where the annular boss B does not extend. The support ring B12 and the retaining ring B4 are fastened to the azimuth flange 7 by fasteners. The support ring B12 presses the retaining ring B4 to the lower end surface of the azimuth flange 7, so that the upper end surface of the retaining ring B4 fits tightly with the lower end surface of the azimuth flange 7 without any gap, thereby preventing water from entering the gap and causing corrosion of the equipment, thereby ensuring the sealing performance and durability of the second-level waterproof structure. The ring width of the support ring B12 is not less than half of the ring width of the retaining ring B4.

[0068] The friction ring B3 and the retaining ring B4 are both made of self-lubricating plastic material, which can reduce the friction resistance between the retaining ring B4 and the friction ring B3. In this embodiment, the material of the retaining ring B4 and the friction ring B3 is preferably polytetrafluoroethylene, which has self-lubricating properties and can further reduce the required friction resistance. At the same time, polytetrafluoroethylene is not easy to wear, corrode, and is not easy to stick to impurities in river water or sea water, which can ensure that the friction force of the rotary sealing device is constant and can be used for a long time.

[0069] The third-level waterproof structure includes: a sealing ring 6 , a friction ring 5 and a clamping ring 14 .

[0070] The friction ring 5 is coaxially fixed to the upper end surface of the azimuth housing 10. The outer circumference of the friction ring 5 has a shoulder b, which is used to press the fixed area b of the friction ring B3 onto the horizontal portion b1302 of the cushion block 13, and is used to maintain the flatness of the friction ring B3, so that the lower end surface of the friction ring B3 and the upper end surface of the azimuth housing 10 are tightly fitted without any gap. The upper end surface of the friction ring 5 is higher than the contact surface between the friction ring B3 and the retaining ring B4, that is, a gradually rising stepped structure is formed between the second-level waterproof structure and the third-level waterproof structure, which can effectively prevent water from passing through the third-level waterproof structure.

[0071] The sealing ring 6 is pressed against the lower end surface of the azimuth flange 7 by the clamping ring 14. The sealing ring 6 rotates with the azimuth flange 7. The outer circumferential surface of the sealing ring 6 and the inner circumferential surface of the friction ring 5 are frictionally matched, thereby blocking the entry of water vapor. In this embodiment, the friction ring 5 is preferably a Glay ring, which contains carbon fiber components. When the Glay ring contacts the friction ring 5, the friction resistance is small and a self-lubricating effect can be generated, thereby blocking the entry of water vapor.

[0072] Working principle:

[0073] The rotary sealing device in this embodiment adopts a three-level waterproofing method to gradually waterproof the impact caused by river water or sea water.

[0074] The first-level waterproof structure can block part of the water flow and the impact caused by the water flow. In the first-level waterproof structure, the retaining ring A2 presses against the friction ring A1 to form an extrusion force to block the water flow from entering. The greater the extrusion force between the friction ring A1 and the retaining ring A2, the greater the ability to block the water flow pressure. The extrusion force is adjusted by adjusting the distance between the lower end surface of the disk of the azimuth flange 7 and the azimuth shell 10. The gap between the friction ring A1 and the azimuth shell 10 can form a buffering effect to avoid excessive extrusion of the friction ring A1 due to processing errors or measurement errors, and prevent excessive extrusion from increasing the friction resistance between the retaining ring A2 and the friction ring A1. When the water flow impacts the first-level waterproof structure, most of the water flow is blocked by the first-level waterproof structure, and part of the water flow that cannot be blocked passes through the first-level waterproof structure.

[0075] The second-level waterproof structure blocks part of the water flow that the first-level waterproof structure fails to block. In the second-level waterproof structure, the retaining ring B4 presses against the friction ring B3 to form an extrusion force to block the water flow from entering. Since most of the water flow has been blocked in the first-level waterproof structure, the extrusion force between the friction ring B3 and the retaining ring B4 can be less than the extrusion force between the friction ring A1 and the retaining ring A2. The extrusion force between the friction ring B3 and the retaining ring B4 is adjusted by adjusting the distance between the orientation flange 7 and the orientation shell 10. The gap between the friction ring b3 and the pad 13 can form a buffering effect to avoid excessive extrusion of the friction ring B3 due to processing errors or measurement errors, and prevent excessive extrusion from increasing the friction resistance between the retaining ring B4 and the friction ring B3. Part of the water flow that the first-level waterproof structure fails to block is blocked by the second-level waterproof structure, and only water vapor passes through the second-level waterproof structure.

[0076] The friction fit between the friction ring 5 and the sealing ring 6 in the third-level waterproof structure prevents the remaining water vapor from entering, thereby achieving waterproof sealing.

[0077] The first-level waterproof structure and the second-level waterproof structure block most of the water flow, thereby reducing the friction resistance required by the sealing ring at the third-level waterproof structure, thereby reducing the friction resistance required for waterproofing and reducing the overall occupied area of ​​the rotary sealing device. At the same time, the friction ring A1, the retaining ring A2, the friction ring B3 and the retaining ring B4 are all made of polytetrafluoroethylene, which can reduce the friction resistance generated in the first-level waterproof structure and the friction resistance generated in the second-level waterproof structure, can further reduce the friction resistance, can effectively reduce the required power, and thus reduce the occupied space of the equipment with relative rotation on the sea or river transport carrier. The rotary sealing device in this embodiment occupies a height space of only 9mm, and the waterproof friction force is about 4.4Nm (the waterproof friction force of the sealing device used for equipment with relative rotation is generally not less than 10N.m).

[0078] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary sealing device, arranged in the gap between an azimuth flange (7) and an azimuth housing (10) which are in relative rotation; It is characterized in that include: Friction ring A (1), retaining ring A (2), friction ring B (3), retaining ring B (4), friction ring (5) and sealing ring (6); The friction ring A (1), friction ring B (3) and friction ring (5) are arranged on the azimuth housing (10) in sequence from outside to inside; The retaining ring A (2), retaining ring B (4) and sealing ring (6) are arranged on the azimuth flange (7) in sequence from outside to inside; The retaining ring A (2) abuts against the friction ring A (1) to form a first-level waterproof structure; The retaining ring B (4) abuts against the friction ring B (3) to form a second-level waterproof structure; The sealing ring (6) and the friction ring (5) are frictionally matched to form a third-level waterproof structure; The contact surface between the friction ring B (3) and the retaining ring B (4) is higher than the contact surface between the friction ring A (1) and the retaining ring A (2); the upper end surface of the friction ring (5) is higher than the contact surface between the friction ring B (3) and the retaining ring B (4).

2. A rotary sealing device as claimed in claim 1, characterized in that: An annular boss A extends downward from the front side of the lower end of the retaining ring A (2); the lower end surface of the annular boss A abuts against the upper end surface of the friction ring A (1).

3. A rotary sealing device as claimed in claim 1, characterized in that: The first-level waterproof structure further includes: a support ring A (11); The retaining ring A (2) is pressed against the lower end surface of the azimuth flange (7) through the support ring A (11).

4. A rotary sealing device as claimed in claim 2, characterized in that: The friction ring A (1) is divided into a fixed area a and a suspended area a; The fixed area a and the suspended area a are both annular structures, and the suspended area a is located at the periphery of the fixed area a; The azimuth housing (10) comprises: an inclined portion a (701) which is higher inside and lower outside, and a horizontal portion a (702), wherein the highest point of the inclined portion a (701) is connected to the outer periphery of the horizontal portion a (702); The fixed area a of the friction ring A (1) is fixedly connected to the horizontal part a (702) of the azimuth shell (10), and the suspended area a is located above the inclined part a (701) of the azimuth shell (10); The annular boss A of the retaining ring A (2) abuts against the upper end surface of the suspended area a of the friction ring A (1).

5. A rotary sealing device as claimed in claim 4, characterized in that: The second-level waterproof structure further comprises: a cushion block (13); The cushion block (13) is an annular structure and is coaxially fixed to the horizontal portion a (702) of the azimuth housing (10); The outer circumference of the cushion block (13) has a shoulder a, and the upper end surface of the cushion block (13) includes: an inclined portion b (1301) which is higher inside and lower outside, and a horizontal portion b (1302); The fixing area a of the friction ring A (1) is pressed against the horizontal part a (702) of the azimuth housing (10) via the shaft shoulder a; The friction ring B (3) is mounted on the horizontal portion b (1302) of the cushion block (13).

6. A rotary sealing device as claimed in claim 5, characterized in that: The friction ring B (3) is divided into a fixed area b and a suspended area b. The fixed area b of the friction ring B (3) is fixedly connected to the horizontal part b (1302) of the cushion block (13), and the suspended area b is located above the inclined part b (1301) of the cushion block (13).

7. A rotary sealing device as claimed in claim 6, characterized in that: An annular boss B extends downward from the front side of the lower end face of the retaining ring B (4); the lower end face of the annular boss B abuts against the upper end face of the suspended area b of the friction ring B (3).

8. A rotary sealing device as claimed in claim 7, characterized in that: The second-level waterproof structure further comprises: a support ring B (12); The retaining ring B (4) is pressed against the lower end surface of the azimuth flange (7) through the support ring B (12).

9. A rotary sealing device as claimed in claim 6, characterized in that: The outer circumference of the friction ring (5) has a shaft shoulder b; The fixed area b of the friction ring B (3) is pressed against the horizontal part b (1302) of the cushion block (13) through the shaft shoulder b; The sealing ring (6) is pressed against the lower end surface of the azimuth flange (7) through a pressing ring (14).

10. A rotary sealing device according to any one of claims 1 to 8, characterized in that: The friction ring A (1), the retaining ring A (2), the friction ring B (3) and the retaining ring B (4) are all made of self-lubricating plastic material.

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