阅读说明：本技术 一种密封结构及水泵 (Sealing structure and water pump ) 是由 曹恒超 滕帅 王伟 李正现 于 2019-11-19 设计创作，主要内容包括：本发明涉及密封装置技术领域,具体公开了一种密封结构及水泵,该密封结构包括静密封组件和动密封组件：静密封组件套设于轴件且与轴件间隙配合,静密封组件与安装孔的孔壁密封配合,轴件静止时,静密封组件的第一配合面与动密封组件的第二配合面贴合,轴件转动时,第二配合面上设置的第一动压槽产生动压效应,使第一配合面和第二配合面分离,且第一动压槽能够将动密封组件外侧的流体介质向其内侧且位于第二配合面上的第一回液槽泵送,第一回液槽通过与其连通的第一回液通道返回至动密封组件外部,从而流体介质形成循环,可以防止动密封组件升温,保证密封效果,同时动密封组件和静密封组件不接触,可避免磨损。水泵包括上述密封结构。(The invention relates to the technical field of sealing devices, and particularly discloses a sealing structure and a water pump, wherein the sealing structure comprises a static sealing assembly and a dynamic sealing assembly: the static sealing assembly is sleeved on the shaft and is in clearance fit with the shaft, the static sealing assembly is in sealing fit with the hole wall of the mounting hole, when the shaft is static, a first matching surface of the static sealing assembly is attached to a second matching surface of the dynamic sealing assembly, when the shaft rotates, a first dynamic pressure groove arranged on the second matching surface generates a dynamic pressure effect, the first matching surface is separated from the second matching surface, the first dynamic pressure groove can pump fluid media outside the dynamic sealing assembly to a first liquid returning groove arranged on the inner side of the first dynamic pressure groove and on the second matching surface, the first liquid returning groove returns to the outside of the dynamic sealing assembly through a first liquid returning channel communicated with the first liquid returning groove, so that the fluid media form circulation, the temperature rise of the dynamic sealing assembly can be prevented, the sealing effect is ensured, meanwhile, the dynamic sealing assembly is not in contact with the static sealing assembly, and abrasion. The water pump comprises the sealing structure.)

1. A sealing structure is used for connecting a shaft piece and a hole piece, and a mounting hole is arranged on the hole piece, and is characterized by comprising a static sealing assembly (100) and a dynamic sealing assembly (200):

the static seal assembly (100) is sleeved on the shaft and in clearance fit with the shaft, the static seal assembly (100) is in sealing fit with the hole wall of the mounting hole, and the static seal assembly (100) comprises a first fitting surface (101);

the dynamic seal assembly (200) is hermetically sleeved on the shaft, the dynamic seal assembly (200) comprises a second matching surface (201), a first liquid return groove (21) and a plurality of first dynamic pressure grooves (22) are arranged on the second matching surface (201), the first dynamic pressure grooves (22) are uniformly distributed in the circumferential direction of the dynamic seal assembly (200) and along the radial direction of the dynamic seal assembly (200), the first dynamic pressure grooves (22) are positioned on the outer side of the first liquid return groove (21), a first liquid return channel communicated with the first liquid return groove (21) is arranged in the dynamic seal assembly (200), and an opening of the first liquid return channel is arranged on the peripheral surface of the dynamic seal assembly (200);

the shaft piece has a static state and a rotating state, when the shaft piece is located in the static state, the first matching surface (101) and the second matching surface (201) are jointed along the axial direction of the dynamic seal assembly (200), when the shaft piece is located in the rotating state, the first matching surface (101) and the second matching surface (201) are separated, and the first dynamic pressure groove (22) can pump the fluid medium outside the dynamic seal assembly (200) to the first liquid return groove (21).

2. The seal structure according to claim 1, wherein the first dynamic pressure groove (22) includes a first closed end (221) and a first open end (222), the first open end (222) being provided to an outer circumferential surface of the dynamic seal assembly (200), the first closed end (221) being located between the first liquid return groove (21) and the outer circumferential surface of the dynamic seal assembly (200).

3. The sealing structure according to claim 1, wherein a second liquid return groove (31) and a plurality of second dynamic pressure grooves (32) are further disposed on the second mating surface (201), the plurality of second dynamic pressure grooves (32) are uniformly distributed in the circumferential direction of the dynamic seal assembly (200), along the radial direction of the dynamic seal assembly (200), the second liquid return groove (31) is located outside the second dynamic pressure groove (32) and inside the first liquid return groove (21), a second liquid return channel communicated with the second liquid return groove (31) is disposed in the dynamic seal assembly (200), and an opening of the second liquid return channel is disposed on the inner circumferential surface of the dynamic seal assembly (200); when the shaft is in a rotating state, the second dynamic pressure groove (32) can pump the fluid medium inside the dynamic seal assembly (200) to the second liquid return groove (31).

4. The seal structure according to claim 3, wherein the second dynamic pressure groove (32) includes a second closed end (321) and a second open end (322), the second open end (322) being provided to the inner peripheral surface of the dynamic seal assembly (200), the second closed end (321) being located between the second liquid return groove (31) and the inner peripheral surface of the dynamic seal assembly (200).

5. The sealing structure according to claim 3, wherein the dynamic seal assembly (200) includes a dynamic ring seat (11), and an outer dynamic ring (12), an intermediate dynamic ring (13) and an inner dynamic ring (14) which are all disposed on the dynamic ring seat (11), the dynamic ring seat (11) is disposed on the shaft member in a sealing manner, the outer dynamic ring (12) is sleeved on the intermediate dynamic ring (13), the intermediate dynamic ring (13) is sleeved on the inner dynamic ring (14), and the second fitting surface (201) is formed by the axial end surfaces of the outer dynamic ring (12), the intermediate dynamic ring (13) and the inner dynamic ring (14) facing the static seal assembly (100).

6. The seal structure of claim 5, characterized in that the hardness of the outer rotating ring (12), the intermediate rotating ring (13) and the inner rotating ring (14) is gradually reduced.

7. The seal structure according to claim 5, wherein the first dynamic pressure groove (22) is provided to the outer rotating ring (12), the second dynamic pressure groove (32) is provided to the inner rotating ring (14), the first liquid return groove (21) is provided between the intermediate rotating ring (13) and the outer rotating ring (12), the second liquid return groove (31) is provided between the inner rotating ring (14) and the intermediate rotating ring (13), the first liquid return passage includes a first liquid hole (232) penetrating an inner peripheral surface and an outer peripheral surface of the outer rotating ring (12), and a first liquid return gap (231) is provided between the outer rotating ring (12) and the intermediate rotating ring (13), the first liquid return gap (231) communicates the first liquid hole (232) and the first liquid return groove (21), the second liquid return passage includes a second liquid hole (332) penetrating the inner peripheral surface and the outer peripheral surface of the inner rotating ring (14), and a second liquid return gap (331) arranged between the middle movable ring (13) and the inner movable ring (14), wherein the second liquid return gap (331) is communicated with the second liquid hole (332) and the second liquid return groove (31).

8. The seal structure of claim 7, wherein the dynamic seal assembly (200) further comprises an outboard seal ring (41), a mid seal ring (42), and an inboard seal ring (43), the outer sealing ring (41) is arranged between the outer peripheral surfaces of the movable ring seat (11) and the outer movable ring (12), the middle sealing ring (42) is arranged between the inner circumferential surface of the outer rotating ring (12) and the outer circumferential surface of the middle rotating ring (13), the inner seal ring (43) is arranged between the inner peripheral surface of the middle rotating ring (13) and the outer peripheral surface of the inner rotating ring (14), the middle sealing ring (42) is far away from the second matching surface (201) relative to the first liquid return gap (231), the inner side sealing ring (43) is far away from the second matching surface (201) relative to the second liquid return gap (331).

9. The seal structure according to claim 5, wherein the rotating ring seat (11) is provided with a first receiving groove (111), the opening of the first receiving groove (111) faces the static seal assembly (100), and the outer rotating ring (12), the middle rotating ring (13) and the inner rotating ring (14) are all arranged in the first receiving groove (111);

the dynamic seal assembly (200) further comprises a first elastic assembly, a second elastic assembly and a third elastic assembly which are arranged in the first accommodating groove (111), the first elastic assembly is arranged between the bottom wall of the first accommodating groove (111) and the outer side movable ring (12), the second elastic assembly is arranged between the bottom wall of the first accommodating groove (111) and the middle movable ring (13), and the third elastic assembly is arranged between the bottom wall of the first accommodating groove (111) and the inner side movable ring (14).

10. The seal structure of claim 9, wherein the spring constant of the first resilient component, the spring constant of the second resilient component, and the spring constant of the third resilient component decrease in sequence.

11. The seal structure of claim 9, wherein said dynamic seal assembly (200) further comprises a first support (51), a second support (52) and a third support (53), said first support (51) abutting said first elastic assembly and said outer dynamic ring (12), respectively, said second support (52) abutting said second elastic assembly and said intermediate dynamic ring (13), respectively, said third support (53) abutting said third elastic assembly and said inner dynamic ring (14), respectively.

12. The sealing structure according to claim 11, wherein the first elastic assembly includes a plurality of first compression springs (61) distributed along a circumferential direction of the dynamic sealing assembly (200), the second elastic assembly includes a plurality of second compression springs (62) distributed along the circumferential direction of the dynamic sealing assembly (200), the third elastic assembly includes a plurality of third compression springs (63) distributed along the circumferential direction of the dynamic sealing assembly (200), a first guide column (121) is disposed on a bottom wall of the first accommodating groove (111) corresponding to each first compression spring (61), each first compression spring (61) is sleeved on the corresponding first guide column (121), a second guide column (113) is disposed on a bottom wall of the first accommodating groove (111) corresponding to each second compression spring (62), each second compression spring (62) is sleeved on the corresponding second guide column (113), third guide columns (114) are arranged on the bottom wall of the first accommodating groove (111) corresponding to the third pressure springs (63), and the third pressure springs (63) are sleeved on the corresponding third guide columns (114).

13. The seal structure of claim 9, wherein along the axial direction of the dynamic seal assembly (200), the dynamic ring seat (11), the outer dynamic ring (12), the middle dynamic ring (13) and the inner dynamic ring (14) are abutted in sequence, and the dynamic ring seat (11) presses the outer dynamic ring (12) towards the direction close to the bottom wall of the first receiving groove (111).

14. The seal structure of claim 5, wherein the dynamic seal assembly (200) further comprises an axial seal ring (44), the axial seal ring (44) being disposed between the dynamic ring seat (11) and the outer dynamic ring (12) in an axial direction of the dynamic seal assembly (200).

15. The seal structure of claim 5, wherein the static seal assembly (100) includes a static ring seat (71), a second accommodating groove (711) is formed in the static ring seat (71), a notch of the second accommodating groove (711) faces the dynamic sealing assembly (200), the static seal assembly (100) further comprises an outer static ring (72), a middle static ring (73) and an inner static ring (74) which are all arranged in the second accommodating groove (711), the static ring seat (71) is arranged in the mounting hole in a sealing way and is in clearance fit with the shaft part, the outer static ring (72) is sleeved on the middle static ring (73), the middle static ring (73) is sleeved on the inner static ring (74), the first mating surface (101) is formed by axial end surfaces of the outer stationary ring (72), the intermediate stationary ring (73), and the inner stationary ring (74) facing the dynamic seal assembly (200).

16. The seal structure according to claim 15, wherein the static seal assembly (100) further includes a first seal ring (75) and a second seal ring (76), the first seal ring (75) being disposed between an outer peripheral surface of the outer static ring (72) and a groove wall of the second receiving groove (711), the second seal ring (76) being disposed between an inner peripheral surface of the inner static ring (74) and a groove wall of the second receiving groove (711).

17. The seal structure according to claim 15, characterized in that the outer stationary ring (72), the intermediate stationary ring (73) and the inner stationary ring (74) are successively reduced in hardness.

18. A water pump comprising a seal structure according to any one of claims 1 to 17.

Technical Field

The invention relates to the technical field of sealing devices, in particular to a sealing structure and a water pump.

Background

At present, a sealing structure is commonly used for sealing a rotating shaft piece and a matched hole piece, and is applied to a water pump, an oil pump, a water pump and a crankshaft of a diesel engine.

Taking the water pump as an example, the water pump plays crucial effect to diesel oil cooling system, and the water seal is the key spare part in the water pump constitution, and it plays sealed effect to the coolant liquid, prevents that the coolant liquid from leaking and leading to the bearing to damage. At present, the water seal adopts rubber materials's seal part usually, including integrative sealed body and the sealing sleeve who sets up, however, because the water seal structure is the contact structure, along with the extension of water pump operating duration, can take place the wearing and tearing and leak the phenomenon, simultaneously, along with the increase of diesel engine operating duration, coolant temperature is higher, not only can cause the water seal great heat altered shape to appear and can take place vaporization phenomenon simultaneously, influences the stability of the sealed effect of seal structure.

Disclosure of Invention

One object of the present invention is: the utility model provides a seal structure to solve the seal structure among the prior art and adopt contact structure, wear and tear and leakage phenomenon take place for a long time to use easily.

Another object of the invention is: the utility model provides a water pump to solve among the prior art seal structure of water pump and use the easy thermal deformation that appears for a long time, lead to the problem of sealed effect variation.

In one aspect, the present invention provides a sealing structure for connecting a shaft member and a bore member, the bore member being provided with a mounting hole, the sealing structure comprising a static sealing assembly and a dynamic sealing assembly:

the static sealing assembly is sleeved on the shaft and in clearance fit with the shaft, the static sealing assembly is in sealing fit with the hole wall of the mounting hole, and the static sealing assembly comprises a first fitting surface;

the dynamic seal assembly is arranged on the shaft piece in a sealing manner and comprises a second matching surface, a first liquid return groove and a plurality of first dynamic pressure grooves are arranged on the second matching surface, the first dynamic pressure grooves are uniformly distributed in the circumferential direction of the dynamic seal assembly and along the radial direction of the shaft piece, the first dynamic pressure grooves are positioned on the outer side of the first liquid return groove, a first liquid return channel communicated with the first liquid return groove is arranged in the dynamic seal assembly, and an opening of the first liquid return channel is arranged on the outer peripheral surface of the dynamic seal assembly;

the shaft piece is provided with a static state and a rotating state, when the shaft piece is located in the static state, the first matching surface and the second matching surface are attached along the axial direction of the shaft piece, when the shaft piece is located in the rotating state, the first matching surface and the second matching surface are separated, and the first dynamic pressure groove can pump the flowing medium outside the dynamic seal assembly to the first liquid return groove.

As a preferable technical solution of the sealing structure, the first dynamic pressure tank includes a first closed end and a first open end, the first open end is disposed on the outer circumferential surface of the dynamic seal assembly, and the first closed end is located between the first liquid return tank and the outer circumferential surface of the dynamic seal assembly.

As a preferred technical solution of the sealing structure, a second liquid returning groove and a plurality of second dynamic pressure grooves are further arranged on the second matching surface, the plurality of second dynamic pressure grooves are uniformly distributed in the circumferential direction of the dynamic seal assembly along the radial direction of the shaft, the second liquid returning groove is located outside the second dynamic pressure groove and inside the first liquid returning groove, a second liquid returning channel communicated with the second liquid returning groove is arranged in the dynamic seal assembly, and an opening of the second liquid returning channel is arranged on the inner circumferential surface of the dynamic seal assembly; when the shaft piece is in a rotating state, the second dynamic pressure groove can pump the fluid medium inside the dynamic seal assembly to the second liquid return groove.

As a preferable technical solution of the sealing structure, the second dynamic pressure tank includes a second closed end and a second open end, the second open end is disposed on the inner circumferential surface of the dynamic seal assembly, and the second closed end is located between the second liquid return tank and the inner circumferential surface of the dynamic seal assembly.

As the preferred technical scheme of seal structure, the dynamic seal subassembly include the rotating ring seat with all set up in outside rotating ring, middle rotating ring and inboard rotating ring on the rotating ring seat, the rotating ring seat seal set up in the axle piece, outside rotating ring overlaps to be located middle rotating ring, middle rotating ring overlaps to be located inboard rotating ring, the second fitting surface by outside rotating ring middle rotating ring and inboard rotating ring orientation the axial terminal surface of static seal subassembly forms.

As a preferable technical means of the seal structure, the hardness of the outer rotating ring, the intermediate rotating ring and the inner rotating ring is gradually reduced.

As a preferable technical scheme of the sealing structure, the first dynamic pressure groove is arranged on the outer dynamic ring, the second dynamic pressure groove is arranged on the inner side rotating ring, the first liquid returning groove is arranged between the middle rotating ring and the outer side rotating ring, the second liquid return groove is arranged between the inner side rotating ring and the middle rotating ring, the first liquid return channel comprises a first liquid hole penetrating through the inner circumferential surface and the outer circumferential surface of the outer side rotating ring, and a first liquid return gap arranged between the outer side rotating ring and the middle rotating ring, wherein the first liquid return gap is communicated with the first liquid hole and the first liquid return groove, the second liquid return channel comprises a second liquid hole which penetrates through the inner circumferential surface and the outer circumferential surface of the inner side rotating ring, and a second liquid return gap arranged between the middle movable ring and the inner movable ring, wherein the second liquid return gap is communicated with the second liquid hole and the second liquid return groove.

As a preferred technical solution of the sealing structure, the dynamic sealing assembly further includes an outer sealing ring, a middle sealing ring and an inner sealing ring, the outer sealing ring is disposed between the dynamic ring seat and the outer circumferential surface of the outer dynamic ring, the middle sealing ring is disposed between the inner circumferential surface of the outer dynamic ring and the outer circumferential surface of the middle dynamic ring, the inner sealing ring is disposed between the inner circumferential surface of the middle dynamic ring and the outer circumferential surface of the inner dynamic ring, the middle sealing ring is away from the second matching surface relative to the first liquid return gap, and the inner sealing ring is away from the second matching surface relative to the second liquid return gap.

As a preferred technical scheme of the sealing structure, a first accommodating groove is formed in the movable ring seat, an opening of the first accommodating groove faces the static sealing assembly, and the outer side movable ring, the middle movable ring and the inner side movable ring are all arranged in the first accommodating groove;

the dynamic seal assembly further comprises a first elastic assembly, a second elastic assembly and a third elastic assembly which are arranged in the first accommodating groove, the first elastic assembly is arranged between the bottom wall of the first accommodating groove and the outer side movable ring, the second elastic assembly is arranged between the bottom wall of the first accommodating groove and the middle movable ring, and the third elastic assembly is arranged between the bottom wall of the first accommodating groove and the inner side movable ring.

As a preferable embodiment of the seal structure, the elastic modulus of the first elastic member, the elastic modulus of the second elastic member, and the elastic modulus of the third elastic member are decreased in this order.

As a preferred technical solution of the sealing structure, the dynamic sealing assembly further includes a first supporting member, a second supporting member and a third supporting member, the first supporting member is respectively abutted to the first elastic assembly and the outer dynamic ring, the second supporting member is respectively abutted to the second elastic assembly and the middle dynamic ring, and the third supporting member is respectively abutted to the third elastic assembly and the inner dynamic ring.

As a preferable technical scheme of the sealing structure, the first elastic assembly comprises a plurality of first compression springs distributed along the circumferential direction of the dynamic sealing assembly, the second elastic component comprises a plurality of second compressed springs distributed along the circumferential direction of the dynamic seal component, the third elastic assembly comprises a plurality of third pressure springs distributed along the circumferential direction of the dynamic seal assembly, the bottom wall of the first accommodating groove is provided with first guide posts corresponding to the first pressure springs, the first pressure springs are sleeved on the corresponding first guide posts, second guide posts are arranged on the bottom wall of the first accommodating groove corresponding to the second pressure springs, the second pressure springs are sleeved on the corresponding second guide posts, and third guide posts are arranged on the bottom wall of the first accommodating groove corresponding to the third pressure springs, and the third pressure springs are sleeved on the corresponding third guide posts.

As a preferred technical scheme of the sealing structure, along the axial direction of the dynamic sealing assembly, the dynamic ring seat, the outer dynamic ring, the middle dynamic ring and the inner dynamic ring are sequentially abutted, and the dynamic ring seat abuts and presses the outer dynamic ring to be close to the bottom wall of the first accommodating groove.

As a preferred technical scheme of the sealing structure, the dynamic sealing assembly further comprises an axial sealing ring, and the axial sealing ring is arranged between the dynamic ring seat and the outer dynamic ring along the axial direction of the dynamic sealing assembly.

As the preferred technical scheme of seal structure, quiet seal assembly includes quiet ring seat, be equipped with the second holding tank on the quiet ring seat, the notch orientation of second holding tank move seal assembly, quiet seal assembly still including all set up in quiet ring in the outside in the second holding tank, middle quiet ring and inboard quiet ring, quiet ring seat seal set up in the mounting hole and with shaft piece clearance fit, the quiet ring cover in the outside is located middle quiet ring, middle quiet ring cover is located inboard quiet ring, first fitting surface by the quiet ring in the outside middle quiet ring and inboard quiet ring orientation move seal assembly's axial end face and form.

As a preferable technical solution of the sealing structure, the static sealing assembly further includes a first sealing ring and a second sealing ring, the first sealing ring is disposed between the outer circumferential surface of the outer static ring and the groove wall of the second accommodating groove, and the second sealing ring is disposed between the inner circumferential surface of the inner static ring and the groove wall of the second accommodating groove.

As a preferable aspect of the seal structure, the outer stationary ring, the intermediate stationary ring, and the inner stationary ring have hardness decreasing in this order.

In another aspect, the present disclosure provides a water pump including the sealing structure according to any one of the above aspects.

The invention has the beneficial effects that:

the invention provides a sealing structure, which comprises a static sealing assembly and a dynamic sealing assembly: the static sealing assembly is sleeved on the shaft and in clearance fit with the shaft, the static sealing assembly is in sealing fit with the hole wall of the mounting hole, and the static sealing assembly comprises a first fitting surface; the dynamic seal assembly is sleeved on the shaft piece in a sealing manner, the dynamic seal assembly comprises a second matching surface, a first liquid return groove and a plurality of first dynamic pressure grooves are formed in the second matching surface, the first dynamic pressure grooves are uniformly distributed in the circumferential direction of the dynamic seal assembly and are positioned on the outer side of the first liquid return groove along the radial direction of the shaft piece, a first liquid return channel communicated with the first liquid return groove is formed in the dynamic seal assembly, and an opening of the first liquid return channel is formed in the peripheral surface of the dynamic seal assembly; the shaft part has a static state and a rotating state, when the shaft part is in the static state, the first matching surface and the second matching surface are attached along the axial direction of the shaft part, when the shaft part is in the rotating state, the first matching surface and the second matching surface are separated, and the first dynamic pressure groove can pump the fluid medium outside the dynamic seal assembly to the first liquid return groove. When the shaft element rotates, the dynamic pressure groove generates a dynamic pressure effect to separate the first matching surface and the second matching surface, so that friction cannot be generated between the static sealing assembly and the dynamic sealing assembly, the sealing structure can be effectively prevented from being abraded, and the sealing effect is ensured. And, through set up first fluid return groove and first fluid return passageway on the second fitting surface, when the shaft member rotated, the first dynamic pressure groove will produce the pumping action to the inboard, and the fluid medium outside the dynamic seal subassembly can be pumped to first fluid return groove, then flows back to the dynamic seal subassembly outside through first fluid return passageway to make fluid medium form the outside circulation, can effectively reduce the temperature of dynamic seal subassembly, prevent that the dynamic seal subassembly from excessively rising temperature, guarantee sealed effect.

The invention provides a water pump, which comprises the sealing structure, when the water pump runs, a movable sealing component rotates relative to a static sealing component, a first dynamic pressure groove can generate an inward pumping action to pump cooling liquid on the outer side of the movable sealing component to a first liquid return groove, the cooling liquid entering the first liquid return groove flows back to the outer side of the movable sealing component through a first liquid return channel, so that the cooling liquid forms outer circulation, excessive temperature rise of the movable sealing component is prevented, and the sealing effect is ensured.

Drawings

FIG. 1 is a schematic structural view of a seal structure in an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a seal configuration in an embodiment of the present invention;

FIG. 3 is an exploded view of a dynamic seal assembly in an embodiment of the present invention;

FIG. 4 is an exploded view of a static seal assembly in an embodiment of the present invention;

FIG. 5 is an enlarged view taken at A in FIG. 1;

FIG. 6 is an enlarged view at B of FIG. 2;

fig. 7 is an enlarged view at C in fig. 2.

In the figure:

100. a static seal assembly; 101. a first mating surface; 200. a dynamic seal assembly; 201. a second mating surface;

11. a movable ring seat; 111. a first accommodating groove; 112. a first guide post; 113. a second guide post; 114. a third guide post; 12. an outer rotating ring; 121. a first avoidance hole; 13. a middle movable ring; 131. a second avoidance hole; 14. an inner movable ring; 141. a third avoidance hole;

21. a first liquid returning groove; 22. a first dynamic pressure groove; 221. a first closed end; 222. a first open end; 231. A first liquid return gap; 232. a first liquid hole;

31. a second liquid return tank; 32. a second dynamic pressure groove; 321. a second closed end; 322. a second open end; 331. A second liquid return gap; 332. a second liquid hole;

41. an outer seal ring; 42. a middle seal ring; 43. an inner side seal ring; 44. an axial seal ring;

51. a first support member; 511. a first through hole; 52. a second support member; 512. a second through hole; 53. a third support member; 513. a third through hole;

61. a first pressure spring; 62. a second pressure spring; 63. a third pressure spring;

71. a stationary ring seat; 711. a second accommodating groove; 72. an outer stationary ring; 73. a middle stationary ring; 74. an inner stationary ring; 75. a first seal ring; 76. and a second seal ring.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a sealing structure in an embodiment of the present invention; figure 2 is a cross-sectional view of a seal configuration in an embodiment of the present invention. The embodiment provides a sealing structure, this sealing structure is used for connecting shaft piece and hole piece, is equipped with the mounting hole on the hole piece, and sealing structure includes static seal assembly 100 and dynamic seal assembly 200: the static seal assembly 100 is sleeved on the shaft and in clearance fit with the shaft, the static seal assembly 100 is in sealing fit with the hole wall of the mounting hole, and the static seal assembly 100 comprises a first fitting surface 101; the dynamic seal assembly 200 is hermetically sleeved on the shaft member, the dynamic seal assembly 200 comprises a second matching surface 201, the second matching surface 201 is provided with a first liquid return groove 21 and a plurality of first dynamic pressure grooves 22, the plurality of first dynamic pressure grooves 22 are uniformly distributed in the circumferential direction of the dynamic seal assembly 200 and along the radial direction of the shaft member, the first dynamic pressure grooves 22 are positioned at the outer side of the first liquid return groove 21, a first liquid return channel communicated with the first liquid return groove 21 is arranged in the dynamic seal assembly 200, and an opening of the first liquid return channel is arranged on the peripheral surface of the dynamic seal assembly 200; the shaft member has a stationary state and a rotating state, when the shaft member is in the stationary state, the first mating face 101 and the second mating face 201 are fitted in the axial direction of the shaft member, when the shaft member is in the rotating state, the first mating face 101 and the second mating face 201 are separated, and the first dynamic pressure groove 22 is capable of pumping the fluid medium outside the dynamic seal assembly 200 to the first liquid return groove 21.

The sealing structure provided by the present embodiment, when the shaft member rotates, the first dynamic pressure groove 22 will generate dynamic pressure effect to separate the first mating surface 101 and the second mating surface 201, so that no friction is generated between the static sealing assembly 100 and the dynamic sealing assembly 200, and the sealing structure can be effectively prevented from being worn, and the sealing effect is ensured. Moreover, by arranging the first fluid returning groove 21 and the first fluid returning channel on the second matching surface 201, when the shaft rotates, the first dynamic pressure groove 22 generates an inward pumping action, and the fluid medium outside the dynamic seal assembly 200 can be pumped to the first fluid returning groove 21 and then flows back to the outside of the dynamic seal assembly 200 through the first fluid returning channel, so that the fluid medium forms an outside circulation, the temperature of the dynamic seal assembly 200 can be effectively reduced, the dynamic seal assembly 200 is prevented from being excessively heated, and the sealing effect is ensured. It should be noted that the dynamic pressure generating groove generates dynamic pressure effect as the prior art, and will not be described in detail herein.

It will be appreciated that the first mating face 101 and the second mating face 201 are both planar and that the plane is perpendicular to the axial direction of the shaft member. It should be noted that, in other embodiments, the first mating surface 101 may be disposed on the dynamic seal assembly 200, the second mating surface 201 may be disposed on the dynamic seal assembly 200, and accordingly, the first dynamic pressure groove 22, the first liquid return groove 21 and the first liquid return channel are also disposed on the static seal assembly 100.

Optionally, referring to fig. 5, fig. 5 is an enlarged view of a point a in fig. 1. The first dynamic pressure groove 22 includes a first closed end 221 and a first open end 222, the first open end 222 is disposed on the outer circumferential surface of the dynamic seal assembly 200, the first closed end 221 is located between the first liquid return groove 21 and the outer circumferential surface of the dynamic seal assembly 200, and a connection line between the center of the second matching surface 201 and any point of the first open end 222 and a connection line between the center of the second matching surface 201 and any point of the first closed end 221 are disposed at an acute angle. The first dynamic pressure grooves 22 may be provided to extend in a linear direction or in an arc direction, and when they extend in the arc direction, the central angle of the corresponding arc is an acute angle. Preferably, the side wall of the first opening end 222 is a circular arc surface, and a center line corresponding to the side wall of the first opening end 222 coincides with a center line corresponding to the dynamic seal assembly 200. When the shaft member rotates, the first dynamic pressure groove 22 can generate a dynamic pressure effect, and simultaneously generate a pumping action toward the center of the dynamic seal assembly 200.

Optionally, referring to fig. 5 again, the second matching surface 201 is further provided with a second liquid returning groove 31 and a plurality of second dynamic pressure grooves 32, the plurality of second dynamic pressure grooves 32 are uniformly distributed in the circumferential direction of the dynamic seal assembly 200 along the radial direction of the shaft, the second liquid returning groove 31 is located outside the second dynamic pressure groove 32 and inside the first liquid returning groove 21, the dynamic seal assembly 200 is provided with a second liquid returning channel communicated with the second liquid returning groove 31, and an opening of the second liquid returning channel is disposed on the inner circumferential surface of the dynamic seal assembly 200; when the shaft member is in a rotating state, the second dynamic pressure groove 32 can pump the fluid medium inside the dynamic seal assembly 200 to the second liquid return groove 31. The second dynamic pressure groove 32 can generate an outward pumping action, the cooling liquid at the inner side of the dynamic seal assembly 200 is pumped to the second liquid return groove 31, and the cooling liquid entering the second liquid return groove 31 flows back to the inner side of the dynamic seal assembly 200 through a second liquid return channel, so that the cooling liquid forms an inner circulation; the temperature of the dynamic seal assembly 200 can be effectively reduced, the dynamic seal assembly 200 is prevented from being excessively heated, and the sealing effect is ensured.

Optionally, the second dynamic pressure groove 32 includes a second closed end 321 and a second open end 322, the second open end 322 is disposed on the inner circumferential surface of the dynamic seal assembly 200, the second closed end 321 is located between the second liquid return groove 31 and the inner circumferential surface of the dynamic seal assembly 200, and a connection line between a circle center of the second matching surface 201 and any point on the second open end 322 and a connection line between a circle center of the second matching surface 201 and any point on the second closed end 321 form an acute angle. The second dynamic pressure grooves 32 may be provided to extend in a linear direction or in an arc direction, and when they extend in the arc direction, the central angle of the corresponding arc is an acute angle. Preferably, the side wall of the second opening end 322 is a circular arc surface, and a center line corresponding to the side wall of the second opening end 322 coincides with a center line corresponding to the dynamic seal assembly 200. When the shaft member rotates, the second dynamic pressure groove 32 can generate a dynamic pressure effect, and simultaneously generate a pumping action toward the outside of the dynamic seal assembly 200.

Optionally, referring to fig. 2 and 3, fig. 3 is an exploded view of a dynamic seal assembly according to an embodiment of the present invention. The dynamic seal assembly 200 includes a dynamic ring seat 11, and an outer dynamic ring 12, a middle dynamic ring 13 and an inner dynamic ring 14 which are all disposed on the dynamic ring seat 11, the dynamic ring seat 11 is disposed on the shaft member in a sealing manner, the outer dynamic ring 12 is sleeved on the middle dynamic ring 13, the middle dynamic ring 13 is sleeved on the inner dynamic ring 14, and a second fitting surface 201 is formed by the outer dynamic ring 12, the middle dynamic ring 13 and the inner dynamic ring 14 facing the axial end surface of the static seal assembly 100. When the dynamic seal assembly 200 is used, the angular velocity of the outer dynamic ring 12 is high relative to the angular velocities of the middle dynamic ring 13 and the inner dynamic ring 14, and is relatively easy to damage.

Alternatively, the hardness of the outer rotating ring 12, the intermediate rotating ring 13 and the inner rotating ring 14 is gradually reduced. Since the outer rotating ring 12 is most easily damaged and the inner rotating ring 14 is least easily damaged, the outer rotating ring 12 and the intermediate rotating ring 13 can be further prevented from being damaged by making the hardness of the outer rotating ring 12 the highest and the hardness of the inner rotating ring 14 the lowest. It should be noted that the specific hardness of the outer rotating ring 12, the middle rotating ring 13 and the inner rotating ring 14 can be selected according to actual requirements.

Alternatively, referring to fig. 5 and 6, fig. 6 is an enlarged view of B in fig. 2. The first dynamic pressure groove 22 is disposed on the outer rotating ring 12, the second dynamic pressure groove 32 is disposed on the inner rotating ring 14, the first liquid return groove 21 is disposed between the middle rotating ring 13 and the outer rotating ring 12, the second liquid return groove 31 is disposed between the inner rotating ring 14 and the middle rotating ring 13, the first liquid return channel includes a first liquid hole 232 penetrating through the inner circumferential surface and the outer circumferential surface of the outer rotating ring 12, and a first liquid return gap 231 disposed between the outer rotating ring 12 and the middle rotating ring 13, the first liquid return gap 231 communicates the first liquid hole 232 with the first liquid return groove 21, the second liquid return channel includes a second liquid hole 332 penetrating through the inner circumferential surface and the outer circumferential surface of the inner rotating ring 14, and a second liquid return gap 331 disposed between the middle rotating ring 13 and the inner rotating ring 14, and the second liquid return gap 331 communicates the second liquid hole 332 with the second liquid return groove 31. When the dynamic seal assembly 200 is in use, the fluid medium outside the dynamic seal assembly 200 is pumped into the first fluid return groove 21 by the first dynamic pressure groove 22, then flows to the first fluid hole 232 through the first fluid return gap 231 between the outer dynamic ring 12 and the middle dynamic ring 13, and then flows outside the dynamic seal assembly 200. The fluid medium inside the dynamic seal assembly 200 is pumped into the second liquid returning groove 31 by the second dynamic pressure groove 32, then flows to the second liquid hole 332 through the second liquid returning gap 331 between the inner dynamic ring 14 and the middle dynamic ring 13, and then flows to the inside of the dynamic seal assembly 200. Preferably, along the circumferential direction of the outer rotating ring 12, the outer rotating ring 12 is provided with a plurality of first liquid holes 232, and the plurality of first liquid holes 232 are all communicated with the first liquid return gap 231, along the circumferential direction of the inner rotating ring 14, the inner rotating ring 14 is provided with a plurality of second liquid holes 332, and the plurality of second liquid holes 332 are all communicated with the second liquid return gap 331. Further preferably, the plurality of first liquid holes 232 are uniformly distributed in the circumferential direction of the outer rotating ring 12, and the plurality of second liquid holes 332 are uniformly distributed in the circumferential direction of the inner rotating ring 14.

Optionally, referring to fig. 3 and fig. 6, the dynamic seal assembly 200 further includes an outer seal ring 41, an intermediate seal ring 42, and an inner seal ring 43, the outer seal ring 41 is disposed between the dynamic ring seat 11 and the outer peripheral surface of the outer dynamic ring 12, the intermediate seal ring 42 is disposed between the inner peripheral surface of the outer dynamic ring 12 and the outer peripheral surface of the intermediate dynamic ring 13, the inner seal ring 43 is disposed between the inner peripheral surface of the intermediate dynamic ring 13 and the outer peripheral surface of the inner dynamic ring 14, the intermediate seal ring 42 is far from the second mating surface 201 relative to the first liquid return gap 231, and the inner seal ring 43 is far from the second mating surface 201 relative to the second liquid. In this embodiment, the second liquid return gap 331 is sealed by the inner seal ring 43, thereby preventing leakage. Similarly, the first liquid return gap 231 is sealed by the outer seal ring 41, thereby preventing leakage. By providing the outer seal ring 41, the fluid medium located outside the dynamic seal assembly 200 and the fluid medium located inside the dynamic seal assembly 200 can be prevented from being mixed. It is understood that the outer seal ring 41 is away from the first mating surface 101 relative to the first fluid hole 232, and does not obstruct the fluid medium from flowing from the first fluid hole 232 to the outside of the dynamic seal assembly 200.

Optionally, referring to fig. 3, fig. 6 and fig. 7, the movable ring seat 11 is provided with a first receiving groove 111, an opening of the first receiving groove 111 faces the static seal assembly 100, and the outer movable ring 12, the middle movable ring 13 and the inner movable ring 14 are all disposed in the first receiving groove 111; the dynamic seal assembly 200 further comprises a first elastic assembly, a second elastic assembly and a third elastic assembly which are arranged in the first accommodating groove 111, the first elastic assembly is arranged between the bottom wall of the first accommodating groove 111 and the outer side dynamic ring 12, the second elastic assembly is arranged between the bottom wall of the first accommodating groove 111 and the middle dynamic ring 13, and the third elastic assembly is arranged between the bottom wall of the first accommodating groove 111 and the inner side dynamic ring 14. When the dynamic seal assembly 200 is driven by the shaft element to rotate, under the dynamic pressure provided by the dynamic pressure groove, the outer dynamic ring 12 retracts into the first receiving groove 111 against the elastic force of the first elastic assembly, the middle dynamic ring 13 retracts into the first receiving groove 111 against the elastic force of the second elastic assembly, and the inner dynamic ring 14 retracts into the first receiving groove 111 against the elastic force of the third elastic assembly. In this embodiment, one end of the first engagement surface 101 formed by the outer movable ring 12, the middle movable ring 13 and the inner movable ring 14 is located outside the first receiving groove 111, and the other end is located inside the first receiving groove 111. The first liquid hole 232 and the second liquid hole 332 are also located outside the first accommodation groove 111. And the inner rotating ring 14 is in clearance fit with the shaft.

Optionally, the elastic coefficient of the first elastic assembly, the elastic coefficient of the second elastic assembly and the elastic coefficient of the third elastic assembly decrease in sequence. Because the dynamic pressure borne by the outer moving ring 12, the middle moving ring 13 and the inner moving ring 14 is gradually reduced when the dynamic seal assembly 200 rotates, the axial stress of the outer moving ring 12, the axial stress of the middle moving ring 13 and the axial stress of the inner moving ring 14 are relatively balanced through the arrangement, so that the first elastic assembly, the second elastic assembly and the third elastic assembly have the same deformation amount when the dynamic pressure of the static seal assembly 100 and the dynamic seal assembly 200 is opened. It should be noted that the elastic modulus of the first elastic component, the elastic modulus of the second elastic component and the elastic modulus of the third elastic component can be set according to actual needs.

Optionally, referring to fig. 3, fig. 6 and fig. 7 again, the dynamic seal assembly 200 further includes a first supporting member 51, a second supporting member 52 and a third supporting member 53, the first supporting member 51 abuts against the first elastic member and the outer dynamic ring 12, the second supporting member 52 abuts against the second elastic member and the middle dynamic ring 13, and the third supporting member 53 abuts against the third elastic member and the inner dynamic ring 14. By providing the first support 51, the second support 52, and the third support 53, the outer rotating ring 12, the middle rotating ring 13, and the inner rotating ring 14 can be subjected to a stable elastic force.

Optionally, referring to fig. 2, fig. 6 and fig. 7, along the axial direction of the dynamic seal assembly 200, the dynamic ring seat 11, the outer dynamic ring 12, the middle dynamic ring 13 and the inner dynamic ring 14 are abutted in sequence, and the dynamic ring seat 11 presses the outer dynamic ring 12 toward the bottom wall of the first receiving groove 111. In this embodiment, the notch of the first receiving groove 111 is provided with a first protruding clip inside the first receiving groove 111, and the outer peripheral surface of the outer rotating ring 12 is provided with a first shoulder, and the first protruding clip can abut against the first shoulder. The inner peripheral surface of the outer side rotating ring 12 is provided with a second clamping protrusion, the outer peripheral surface of the middle rotating ring 13 is provided with a second shaft shoulder, the second clamping protrusion can abut against the second shaft shoulder, the inner peripheral surface of the middle rotating ring 13 is provided with a third clamping protrusion, the outer peripheral surface of the inner side rotating ring 14 is provided with a third shaft shoulder, the third clamping protrusion can abut against the third shaft shoulder, the inner peripheral surface of the inner side rotating ring 14 is provided with a fourth clamping protrusion, the inner side groove wall of the first accommodating groove 111 is provided with a fourth shaft shoulder, and the fourth clamping protrusion can abut against the fourth shaft shoulder. Along the axial direction of the dynamic seal assembly 200, the first snap projection, the second snap projection, the third snap projection and the fourth snap projection are gradually away from the first mating face 101. By sequentially abutting the movable ring seat 11, the outer movable ring 12, the middle movable ring 13 and the inner movable ring 14, when the dynamic seal assembly 200 and the static seal assembly 100 are opened at dynamic pressure, the synchronous movement of the outer movable ring 12, the middle movable ring 13 and the inner movable ring 14 can be ensured.

Optionally, referring to fig. 6, the dynamic seal assembly 200 further includes an axial seal ring 44, and the axial seal ring 44 is disposed between the dynamic ring seat 11 and the outer dynamic ring 12 along the axial direction of the dynamic seal assembly 200. Specifically, the axial sealing ring 44 is located at the notch of the first receiving groove 111, the first clamping protrusion clamps the axial sealing ring 44 on the first shaft shoulder, and the axial sealing ring 44 is located between the outer side sealing ring 41 and the first liquid hole 232, so that the fluid medium outside the dynamic seal assembly 200 can be further prevented from entering the first receiving groove 111, and further the fluid medium outside the dynamic seal assembly 200 can be prevented from entering the inner side of the dynamic seal assembly 200.

Optionally, referring to fig. 3, fig. 6 and fig. 7 again, the first elastic assembly includes a plurality of first compression springs 61 distributed along the circumferential direction of the dynamic seal assembly 200, the second elastic assembly includes a plurality of second compression springs 62 distributed along the circumferential direction of the dynamic seal assembly 200, the third elastic assembly includes a plurality of third compression springs 63 distributed along the circumferential direction of the dynamic seal assembly 200, a first guide column 121 is disposed on the bottom wall of the first accommodating groove 111 corresponding to each first compression spring 61, each first compression spring 61 is sleeved on the corresponding first guide column 121, a second guide column 113 is disposed on the bottom wall of the first accommodating groove 111 corresponding to each second compression spring 62, each second compression spring 62 is sleeved on the corresponding second guide column 113, a third guide column 114 is disposed on the bottom wall of the first accommodating groove 111 corresponding to each third compression spring 63, and each third compression spring 63 is sleeved on the corresponding third guide column 114. Preferably, the first support 51 is provided with a first through hole 511 corresponding to each first guide column 121, the aperture of the first through hole 511 is smaller than that of the first pressure spring 61, the second support 52 is provided with a second through hole 521 corresponding to each second guide column 113, the aperture of the second through hole 521 is smaller than that of the second pressure spring 62, the third support 53 is provided with a third through hole 531 corresponding to each third guide column 114, and the aperture of the third through hole 531 is smaller than that of the third pressure spring 63; meanwhile, the bottom surface of the outer moving ring 12 is provided with first avoidance holes 121 corresponding to the first guide posts 121, the bottom surface of the middle moving ring 13 is provided with second avoidance holes 131 corresponding to the second guide posts 113, the bottom surface of the inner moving ring 14 is provided with third avoidance holes 141 corresponding to the third guide posts 114, the first guide posts 121 sequentially penetrate through the corresponding first compression springs 61 and the corresponding first through holes 511 and extend into the corresponding first avoidance holes 121, and similarly, the second guide posts 113 sequentially penetrate through the corresponding second compression springs 62 and the corresponding second through holes 521 and extend into the corresponding second avoidance holes 131, and the third guide posts 114 sequentially penetrate through the corresponding third compression springs 63 and the corresponding third through holes 531 and extend into the corresponding third avoidance holes 141. When the shaft element drives the movable ring seat 11 to rotate, the movable ring seat 11 can drive the outer movable ring 12, the middle movable ring 13 and the inner movable ring 14 to synchronously rotate through the first guide column 121, the second guide column 113 and the third guide column 114. Of course, in other embodiments, the outer rotating ring 12, the middle rotating ring 13, the inner rotating ring 14, and the rotating ring seat 11 may be sequentially clamped in the radial direction of the dynamic seal assembly 200, and the synchronous rotation of the rotating ring seat 11, the outer rotating ring 12, the middle rotating ring 13, and the inner rotating ring 14 may also be achieved.

Optionally, referring to fig. 2 and 4, fig. 4 is an exploded view of a static seal assembly in an embodiment of the present invention. Quiet seal assembly 100 includes quiet ring holder 71, be equipped with second holding tank 711 on quiet ring holder 71, the notch orientation of second holding tank 711 moves seal assembly 200, quiet seal assembly 100 is still including all setting up the quiet ring 72 in the outside in second holding tank 711, middle quiet ring 73 and inboard quiet ring 74, quiet ring holder 71 is sealed set up in the mounting hole and with shaft piece clearance fit, quiet ring 73 in the middle of the quiet ring 72 cover in the outside is located, inboard quiet ring 74 is located to middle quiet ring 73 cover, first fitting surface 101 is by quiet ring 72 in the outside, middle quiet ring 73 and inboard quiet ring 74 are towards the axial terminal surface formation that moves seal assembly 200. Because the dynamic seal assembly 200 and the static seal assembly 100 are opened at the dynamic pressure, the stress on the outer side dynamic ring 12, the middle dynamic ring 13 and the inner side dynamic ring 14 is gradually reduced, so that the stress on the first matching surface 101 of the static seal assembly 100 is also reduced from the outside to the inside in sequence, and relatively speaking, the outer side part is easily damaged, so that the static ring of the static seal assembly 100 is set into three parts from the outside to the inside, which is beneficial to replacement when the outer side static ring 72 is damaged.

Optionally, the static seal assembly 100 further includes a first seal ring 75 and a second seal ring 76, the first seal ring 75 being disposed between the outer circumferential surface of the outer static ring 72 and the groove wall of the second receiving groove 711, and the second seal ring 76 being disposed between the inner circumferential surface of the inner static ring 74 and the groove wall of the second receiving groove 711. By providing the first seal ring 75 and the second seal ring 76, mixing of the fluid medium inside and outside the static seal assembly 100 can be avoided.

Alternatively, the hardness of the outer stationary ring 72, the intermediate stationary ring 73, and the inner stationary ring 74 decreases in this order. Since the outer stationary ring 72 is most easily damaged and the inner stationary ring 74 is least easily damaged, the outer stationary ring 72 and the intermediate stationary ring 73 can be further prevented from being damaged by making the hardness of the outer stationary ring 72 the highest and the hardness of the inner stationary ring 74 the lowest. It should be noted that the specific hardness of the outer stationary ring 72, the middle stationary ring 73 and the inner stationary ring 74 can be selected according to actual requirements.

The embodiment also provides a water pump, which comprises the sealing structure in the scheme. The water pump can be used for diesel engines. When the diesel engine runs, the dynamic seal assembly 200 rotates relative to the static seal assembly 100, and the first dynamic pressure groove 22 generates a dynamic pressure effect to separate the first matching surface 101 from the second matching surface 201, so that friction cannot be generated between the static seal assembly 100 and the dynamic seal assembly 200, the abrasion of a seal structure can be effectively prevented, and the seal effect is ensured. The first dynamic pressure tank 22 can also generate an inward pumping effect, so that the cooling liquid outside the dynamic seal assembly 200 is pumped to the first liquid return tank 21, and the cooling liquid entering the first liquid return tank 21 flows back to the outside of the dynamic seal assembly 200 through the first liquid return channel, so that the cooling liquid forms an outside circulation; meanwhile, the second dynamic pressure tank 32 can also generate an outward pumping effect, so that the cooling liquid inside the dynamic seal assembly 200 is pumped to the second liquid return tank 31, and the cooling liquid entering the second liquid return tank 31 flows back to the inside of the dynamic seal assembly 200 through the second liquid return channel, so that the cooling liquid forms an inward circulation; the temperature of the dynamic seal assembly 200 can be effectively reduced, the dynamic seal assembly 200 is prevented from being excessively heated, and the sealing effect is ensured. And when pressure pulsation occurs, the impact on the middle movable ring 13 can be weakened through the buffering of the inner side movable ring 14, the outer side movable ring 12 and the buffer ring, and the stability of the sealing operation of the water pump is further improved.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.