CN218440636U - End face seal assembly - Google Patents

Abstract

The utility model discloses an end face seal assembly, end face seal assembly includes: a first seal ring formed with a first end face; the second sealing ring is provided with a second end face opposite to the first end face, and a sealing gap is formed between the first end face and the second end face; at least one of the first end face and the second end face is provided with a circumferential groove, at least one of the first end face and the second end face is provided with a radial groove, and the circumferential groove and the radial groove are used for controlling potential positions of fluid phase change in the sealing gap. According to the utility model discloses a terminal surface seal assembly can reduce the terminal surface specific pressure, improves sealed bearing capacity, and restriction vaporization region is running at low-speed simultaneously and is opening and stop stage and different direction of rotation and all have better sealed effect.

Description

End face seal assembly

Technical Field

The utility model belongs to the technical field of the mechanical seal technique and specifically relates to a face seal subassembly is related to.

Background

The mechanical seal face structure is a key component of the foundation in various rotary fluid machines. The mechanical seal is a device which keeps the seal rings in contact with each other and relatively slides under the combined action of end face fluid pressure perpendicular to the rotation axis, the action of the compensation element and the auxiliary seal, and is less in fluid leakage. The common mechanical end face seal has relatively mature sealing end face and structure design for sealing gas medium and liquid medium. With the development of sealing technology and the extension of sealing application media, related designs also have shortcomings and gaps for media applications where phase changes may occur on both sides of the seal due to differences in pressure and temperature. Such application scenarios are basically that the medium is kept in a liquid state in a sealed cavity under certain conditions of temperature and pressure, and changes to a vapor phase under conditions outside the seal. Therefore, phase change usually occurs on the sealing end face, and if the phase change is not controlled by a targeted design, the sealing cannot work effectively, and even failure or accidents occur. In this case, it is more common to have a contact-type mechanical face seal, the face of which is not provided with any groove-type, substantially flat face. The design has the disadvantages that the abrasion of the sealing end surface is large, the service life is relatively short, and therefore some designs adopt non-contact end surface sealing of taper and local deep grooves, and the purpose is to improve the opening force by using the hydrostatic pressure effect and further improve the friction and abrasion condition. However, such static type seals have fewer controllable design parameters and tend to have higher leakage rates. Some end face designs utilize the fluid dynamic pressure effect, and often set dynamic pressure shallow grooves, such as spiral shallow grooves with the depth of several micrometers to dozens of micrometers, according to the rotation direction of the end face, so that the advantages of both the improvement of frictional wear and the control of leakage rate can be considered. However, the dynamic pressure grooves are directional, and the advantage of the dynamic pressure grooves is lost even at low speed when the rotational direction is not constant, and the processing cost of the shallow grooves is high. The present application is directed to an end face seal assembly to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide an end face seal assembly can improve the pressure distribution in the seal clearance, and the potential position that the control phase transition takes place reduces sealed terminal surface specific pressure, improves sealed bearing capacity, at low-speed operation and open and stop the stage and also can protect the terminal surface, reduce the unnecessary wearing and tearing.

According to the utility model discloses end face seal assembly, include: a first seal ring formed with a first end face; the second sealing ring is provided with a second end face opposite to the first end face, and a sealing gap is formed between the first end face and the second end face; at least one of the first end face and the second end face is provided with a circumferential groove, at least one of the first end face and the second end face is provided with a radial groove, and the circumferential groove and the radial groove are used for controlling potential positions of fluid phase change in the sealing gap.

The utility model relates to an end face seal assembly, the fluid in the terminal surface outside flows in the terminal surface clearance along radial groove to through the circumference groove, all keep all regions beyond the circumference groove under higher pressure, make sealed actual terminal surface than the pressure and reduce, sealed bearing capacity has been improved, simultaneously, the circumference groove can avoid fluid partial pressure to reduce and take place the phase transition under fluidic saturated vapor pressure, thereby the potential position that the restriction phase transition takes place effectively reduces the evaporation zone and in the shared proportion in whole sealed clearance, improves sealed effect, in addition, the utility model provides an end face seal assembly also has better performance at low-speed operation and opening the stop stage, protects the terminal surface, reduces unnecessary wearing and tearing.

According to some embodiments of the invention, the radial slot is located on a high pressure side of the circumferential slot.

According to some embodiments of the present invention, the radial groove is configured to be plural, and plural the radial groove is in a circumferential interval arrangement of the first end surface and/or the second end surface, and plural the radial groove is respectively communicated with the circumferential groove.

According to some embodiments of the invention, the circumferential groove comprises a plurality of circumferentially spaced connecting sections, each connecting section communicating with one or more of the radial grooves.

According to some embodiments of the invention, the circumferential groove is configured in a wave shape around a center of rotation of the first sealing ring, each of the radial grooves communicates with an end of the circumferential groove radially closest to the high pressure side.

According to some embodiments of the invention, the radial groove comprises: a plurality of first radial grooves configured adjacent to a high pressure side, the plurality of first radial grooves being circumferentially spaced apart; a plurality of second radial grooves configured to be adjacent to a low pressure side, the plurality of second radial grooves being arranged at intervals in a circumferential direction, the first radial grooves being arranged to be staggered in the circumferential direction with respect to the second radial grooves.

According to some embodiments of the invention, the circumferential groove is configured as a plurality of concentric circles around the first sealing ring rotation center.

According to some embodiments of the invention, the circumferential groove comprises a high pressure side circumferential groove and a low pressure side circumferential groove, the radial groove being provided in the high pressure side of the high pressure side circumferential groove and/or the high pressure side circumferential groove with between the low pressure side circumferential grooves and/or the low pressure side of the low pressure side circumferential groove.

According to some embodiments of the invention, the high pressure side circumferential groove and/or the low pressure side circumferential groove are configured as waves surrounding a rotational center of the first sealing ring.

According to some embodiments of the present invention, the depth of the circumferential groove is d1, the depth of the radial groove is d2, and satisfies: d1 is more than or equal to 0.05mm and less than or equal to 2mm, and d2 is more than or equal to 0.05mm and less than or equal to 2mm.

According to some embodiments of the present invention, the width of the circumferential groove is D1, the width of the radial groove is D2, and satisfies: d1 is more than or equal to 0.1mm and less than or equal to 2mm, and D2 is more than or equal to 0.1mm and less than or equal to 2mm.

According to some embodiments of the invention, the circumferential groove is configured as a plurality of wave segments, broken line segments or curves that are continuous in the circumferential direction.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of an end face seal assembly according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an end face seal assembly according to another embodiment of the present invention;

fig. 3 is a schematic structural view of an end face seal assembly according to another embodiment of the present invention;

FIG. 4 is a schematic structural view of an end face seal assembly according to another embodiment of the present invention;

FIG. 5 is a schematic plan view of circumferential and radial slots of an embodiment of the present invention;

fig. 6 is a schematic plan view of circumferential and radial grooves of another embodiment of the present invention;

fig. 7 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;

fig. 8 is a schematic plan view of circumferential and radial grooves of another embodiment of the present invention;

fig. 9 is a schematic plan view of circumferential and radial grooves of another embodiment of the present invention;

fig. 10 is a schematic illustration of the result of local deformation of the end face of an end face seal assembly according to an embodiment of the present invention;

FIG. 11 is a pressure profile within a seal gap of an end face seal assembly in accordance with an embodiment of the present invention;

fig. 12 is a phase distribution diagram within a seal gap of an end face seal assembly in accordance with an embodiment of the present invention.

Reference numerals:

1: a shaft; 2: a housing; 3: a first seal ring; 4: a second seal ring; 5: a first radial slot; 6: a high pressure side circumferential groove; 7: sealing the dam; 8: a second radial slot; 9: a low pressure side circumferential groove.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically connected, electrically connected or can communicate with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating 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. An end face seal assembly according to an embodiment of the present invention is described below with reference to fig. 1-10.

For the application of media which are possibly subjected to phase change at two sides of the seal due to different pressures and temperatures, the contact type mechanical end face seal is more common, most end faces are not provided with any groove type and are basically flat end faces, the seal mode has larger abrasion of the seal end faces and shorter service life, and therefore some non-contact type end face seals adopting taper and local deep grooves are designed, and the aim of improving opening force by using hydrostatic pressure effect is to improve the friction abrasion condition. However, such hydrostatic seals have fewer controllable design parameters and tend to have higher leakage rates. Some end face designs utilize the fluid dynamic pressure effect, and often set dynamic pressure shallow grooves, such as spiral shallow grooves with the depth of several microns to dozens of microns, according to the rotation direction of the end face, so that the advantages of both the improvement of friction wear and the control of leakage rate can be taken into consideration. However, the dynamic pressure grooves are directional, and the advantage of the dynamic pressure grooves is lost even at low speed when the rotational direction is not constant, and the processing cost of the shallow grooves is high. The present application is directed to an end face seal assembly to address the above technical problems to some extent.

An end face seal assembly according to an embodiment of the present invention is described below with reference to fig. 1-12.

According to the utility model discloses an end face seal assembly, referring to fig. 1, this end face seal assembly includes: the sealing structure comprises a first sealing ring 3 and a second sealing ring 4, wherein the first sealing ring 3 is provided with a first end surface, the second sealing ring 4 is provided with a second end surface which is opposite to the first end surface, a sealing gap is formed between the first end surface and the second end surface, and fluid flows from a high-pressure side to a low-pressure side in the sealing gap; at least one of the first end face and the second end face is provided with a circumferential groove, at least one of the first end face and the second end face is provided with a radial groove, and the circumferential groove and the radial groove are used for controlling the position of fluid phase change in the sealing gap.

The high-pressure side can be located on the radial inner side of the first sealing ring and the radial inner side of the second sealing ring, the low-pressure side can be located on the radial outer side of the first sealing ring and the radial outer side of the second sealing ring, and the high-pressure side and the low-pressure side can be determined according to the environment and the specific scene where the end face sealing assembly is applied.

It is known to the person skilled in the art that for a fluid flowing in the sealing gap there will be an on-way pressure decrease in the direction of flow, the degree of pressure decrease being inversely proportional to the dimension of the sealing gap, the greater the dimension of the sealing gap, the smaller the degree of pressure decrease. The utility model provides an end face seal assembly, owing to be formed with the circumference groove on at least one in first terminal surface and second terminal surface, be formed with radial groove on at least one in first terminal surface and the second terminal surface, the circumference groove can be constructed for the ring channel that encircles 3 centers of rotation of first sealing ring or 4 centers of rotation of second sealing ring, behind fluid inflow radial groove and the circumference groove in the sealing end face outside, radial groove and the regional higher pressure that all can keep in the circumference groove outside, make sealed terminal surface specific pressure reduce, and then improve sealed bearing capacity. Meanwhile, because the areas outside the radial groove and the circumferential groove are kept under higher pressure, the phenomenon that the local pressure of the fluid is reduced to be lower than the saturated vapor pressure to cause phase change can be avoided, therefore, the potential position of the phase change is limited, and the phase change position is limited in a limited area. Meanwhile, the technical personnel in the field know that when the end face sealing assembly is used for rotary mechanical sealing, the speed of the start-stop stage is low, the circumferential groove and the radial groove are simultaneously arranged on the end face sealing assembly, the end face specific pressure can be small under the condition of no rotation, and certain bearing capacity is also provided, so that the end face can be protected in the sealing start-stop stage by arranging the radial groove, friction is avoided, and the end face sealing assembly is suitable for various low, medium and high rotating speeds while effectively controlling the leakage rate through the parameterized design. Meanwhile, due to the symmetrical design of the circumferential groove and the radial groove, the end face sealing assembly can be suitable for various rotating directions and is not limited by a single rotating direction.

It should be noted here that the bearing capacity includes two parts, which are the integral of the pressure distribution of the fluid in the gap and the contact force when the fluid contacts, and the end face specific pressure is the ratio of the solid contact force to the seal bearing capacity.

According to some embodiments of the utility model, when the end face seal subassembly is used for the rotating machinery to seal, the rotating machinery further includes axle 1 and casing 2, 2 bottom trompils of casing, the axle 1 of rotating machinery is worn out from the hole, the first sealing ring 3 of fixed connection on the casing 2, first sealing ring 3 is formed with first terminal surface, second sealing ring 4 is connected on axle 1 and can rotate around axle 1, second sealing ring 4 is formed with the second terminal surface, the first terminal surface of first sealing ring 3 is just to laminating with the second terminal surface of second sealing ring 4. It should be noted here that the operation states of the first seal ring 3 and the second seal ring 4 are not particularly limited, and the second seal ring may also be fixedly connected to the housing 2, the first seal ring 3 rotates around the shaft 1, a high pressure region is formed outside the first seal ring 3 and the second seal ring 4 in the housing 2, a low pressure region is formed between the shaft body and the first seal ring 3 and the second seal ring 4, and a medium in the high pressure region in the housing 2 may enter the low pressure region through the seal gap to lubricate when the first seal ring 3 and the second seal ring 4 rotate relatively, and to improve the bearing capacity between the first seal ring 3 and the second seal ring 4.

According to some embodiments of the present invention, the positions of the radial groove and the circumferential groove on the sealing ring are not particularly limited, for example, referring to fig. 1, both the radial groove and the circumferential groove may be provided on the second sealing ring 4; referring to fig. 2, both radial and circumferential grooves may be provided on the first seal ring 3; with reference to fig. 3, the radial groove is provided on the second sealing ring 4 and the circumferential groove is provided on the first sealing ring 3; referring to fig. 4, the radial groove is provided on the first seal ring 3 and the circumferential groove is provided on the second seal ring 4, which can be selected by those skilled in the art according to actual needs.

According to some embodiments of the present invention, the relative positional relationship of the radial groove and the circumferential groove is not particularly limited, and the radial groove may be located on the low-pressure side of the circumferential groove, or, referring to fig. 1 and 5, the radial groove may be located on the high-pressure side of the circumferential groove. When the radial groove is located on the high pressure side of the circumferential groove, the radial groove diverts the sealing fluid from upstream to downstream in the direction of arrow G under the action of the higher sealing pressure. In addition, a flat ring zone, i.e., a ring zone between R0 and R2, is provided on the inner side, i.e., the low pressure side, of the circumferential groove to function as a throttling and parking seal, and may be referred to as a sealing dam 7. As shown in the pressure profile of fig. 11, the pressure of the high pressure exhibits a higher pressure beyond the sealing dam both through the guidance of the radial groove and the retention of the circumferential groove. The design can effectively reduce the end face specific pressure by increasing the liquid lubrication ratio under the condition of keeping the balance ratio unchanged, cope with the condition of phase change in the sealing end face, control a vaporization region which possibly occurs within a narrow range, effectively reduce the abrasion of the first end face and the second end face and obviously improve the service life of the end face sealing assembly.

According to some embodiments of the present invention, referring to fig. 5, the radial groove may be configured to be plural, and the plural radial grooves are arranged at intervals in the circumferential direction of the first end surface and/or the second end surface, and the plural radial grooves are respectively communicated with the circumferential groove. Specifically, when the radial groove is located on the high-pressure side of the circumferential groove, one end, close to the circumferential groove, of the radial groove is communicated with the circumferential groove, fluid can flow into the circumferential groove directly through diversion of the radial groove, all the areas outside the circumferential groove are kept under high pressure, the end face specific pressure of the seal is reduced, and the bearing capacity of the seal is improved.

According to some embodiments of the present invention, the circumferential groove may be a continuous groove or a discontinuous groove, and referring to fig. 6, the circumferential groove includes a plurality of connecting sections arranged at intervals in the circumferential direction, and each connecting section is communicated with one or more radial grooves. Specifically, the circumferential groove on the sealing ring may be formed by a plurality of mutually disconnected connecting sections, each connecting section is a section of groove, and one end of the radial groove may communicate with the connecting section to form a circumferentially arranged T-shaped groove.

According to some embodiments of the invention, referring to fig. 7, the circumferential groove is configured in a wave shape surrounding the rotation center of the first sealing ring 3, each radial groove communicating with the end of the circumferential groove radially closest to the high pressure side. Specifically, the positions, farthest away from the rotation center, of the wavy circumferential grooves are communicated with the radial grooves, fluid flows into the circumferential grooves through the diversion of the radial grooves, the fluid flowing into the circumferential grooves through the radial grooves can keep high pressure after flowing into the circumferential grooves, the outer sides of the circumferential grooves are high-pressure areas, end face specific pressure is reduced, and sealing bearing capacity is improved.

According to some embodiments of the present invention, after the fluid flows into the circumferential groove through the radial groove diversion, the end face specific pressure of the end face seal assembly can be reduced, the seal bearing capacity is improved, in order to further limit the area where the phase change occurs, radial grooves can be provided on both the high pressure side and the low pressure side of the circumferential groove, referring to fig. 8, the radial grooves can further include a first radial groove 5 and a second radial groove 8, the first radial groove 5 is configured to be a plurality of grooves adjacent to the high pressure side, the first radial grooves 5 are circumferentially spaced, the second radial grooves 8 are configured to be a plurality of grooves adjacent to the low pressure side, the second radial grooves 8 are circumferentially spaced, that is, the first radial groove and the second radial groove are respectively located on both sides of the circumferential groove, the first radial groove communicates with the radially closest end of the high pressure side of the circumferential groove, the second radial groove communicates with the radially closest end of the low pressure side of the circumferential groove, the first radial groove 5 and the second radial groove 8 are circumferentially staggered, that is, that the second radial groove 8 can just form a gap adjacent to the first radial groove 5.

According to some embodiments of the present invention, the fluid can be prevented from continuously decreasing in pressure after flowing into the circumferential groove, and the local pressure of the fluid is stabilized above the saturated vapor pressure of the fluid, so as to limit the area where the phase change occurs, and in order to further reduce the area where the vaporization may occur, referring to fig. 8, the circumferential groove may also be configured in plurality, and the plurality of circumferential grooves are configured as concentric circles around the rotation center of the first seal ring 3.

According to some embodiments of the present invention, the circumferential groove includes a high pressure side circumferential groove 6 and a low pressure side circumferential groove 9, it should be noted that the high pressure side and the low pressure side referred to herein are opposite, the pressure is gradually decreased along the whole fluid flowing direction, the high pressure side circumferential groove 6 refers to the circumferential groove disposed upstream of the fluid flowing direction, the low pressure side circumferential groove 9 refers to the circumferential groove disposed downstream of the fluid flowing direction, and the radial groove is disposed between the high pressure side of the high pressure side circumferential groove 6 and/or the high pressure side circumferential groove 6 and the low pressure side circumferential groove 9 and/or the low pressure side of the low pressure side circumferential groove 9. Specifically, the radial grooves may be provided only on the high pressure side of the high pressure side circumferential groove 6; or, the radial groove is provided only between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9; or, the radial grooves are provided only on the low pressure side of the low pressure side radial grooves 9; or, the radial grooves include a first radial groove 5 and a second radial groove 8, the first radial groove 5 is arranged on the high-pressure side of the high-pressure side circumferential groove 6, and the second radial groove 8 is arranged between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9; or, the radial grooves include a first radial groove 5 and a second radial groove 8, the first radial groove 5 is disposed between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9, and the second radial groove 8 is disposed on the low-pressure side of the low-pressure side circumferential groove 9; or, the radial grooves include a first radial groove 5 and a second radial groove 8, the first radial groove 5 is arranged on the high-pressure side of the high-pressure side circumferential groove 6, and the second radial groove 8 is arranged on the low-pressure side of the low-pressure side circumferential groove 9; or, the radial grooves include a first radial groove 5, a second radial groove 8 and a third radial groove (not shown in the figure), the first radial groove 5 is arranged on the high-pressure side of the high-pressure side circumferential groove 6, the second radial groove 8 is arranged between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9, and the third radial groove is arranged on the low-pressure side of the low-pressure side circumferential groove 9, so that the end face specific pressure of the end face seal assembly is further reduced, the seal bearing capacity is improved, and the area where the phase change occurs is limited.

According to some embodiments of the present invention, the shape of the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9 is not particularly limited, for example, the high-pressure side circumferential groove 6 and/or the low-pressure side circumferential groove 9 are configured in a wavy shape around the rotation center of the first seal ring 33. Specifically, the high-pressure side circumferential groove 6 is configured as a concentric circle around the rotational center of the first seal ring 33, and the low-pressure side circumferential groove 9 is configured as a wave (not shown in the drawings) around the rotational center of the first seal ring 33; or, referring to fig. 9, the high pressure side circumferential groove 6 is configured in a wavy shape around the rotational center of the first seal ring 33, and the low pressure side circumferential groove 9 is configured in a concentric circle around the rotational center of the first seal ring 33; alternatively, referring to fig. 10, the high pressure side circumferential groove 6 and the low pressure side circumferential groove 9 are each configured in a wavy shape around the rotational center of the first seal ring 33. Therefore, the range of the wavy circumferential groove for maintaining the fluid pressure is larger, and the circumferential groove has the effect which can be achieved by a certain radial groove. It should be noted that a wavy circumferential groove protruding radially outward may be provided, and a wavy circumferential groove protruding radially inward may also be provided.

According to some embodiments of the present invention, referring to fig. 3, the depth d1 of the circumferential groove may be constant or may vary. Alternatively, the circumferential groove may have the same depth in the entire circumferential direction, in which case the depth d1 of the circumferential groove is constant; the circumferential groove depth in the circumferential direction may also vary periodically, for example, every 60 degrees, the circumferential groove has a waviness variation, according to some embodiments of the present invention, the circumferential groove depth d1 satisfies 0.05mm ≦ d1 ≦ 2mm. Therefore, the circumferential groove is a deep groove, compared with a shallow groove, the deep groove is processed in a plurality of modes, a plurality of process means can be adopted, the requirement of the deep groove on the precision is relatively wide, and the production cost can be reduced to a certain extent.

According to some embodiments of the present invention, referring to fig. 4, the depth d2 of the radial groove may be constant or may vary. Alternatively, the bottom surface of the radial groove may be a flat surface, in which case the depth d2 of the radial groove is constant; the bottom surface of radial groove can also be the inclined plane, and the degree of depth of radial groove this moment is changed, according to the utility model discloses a some embodiments, the degree of depth d2 of radial groove satisfies 0.05mm and is less than or equal to d2 and is less than or equal to 2mm. Therefore, the radial groove adopts a deep groove, compared with a shallow groove, the deep groove has more processing modes and more available technological means, and the requirement of the deep groove on the precision is relatively wide, so that the production cost can be reduced to a certain extent.

According to some embodiments of the present invention, referring to fig. 5, the width D1 of the circumferential groove may be constant or may vary. Optionally, the circumferential groove is unanimous in whole ascending width in week, perhaps the bottom to the notch of circumferential groove be binding off type or uncovered type, and at this moment, the circumferential groove is radial ascending width to be changed, according to the utility model discloses a some embodiments, the width D1 of circumferential groove satisfies 0.1mm and is less than or equal to D1 and is less than or equal to 2mm.

According to some embodiments of the present invention, referring to fig. 5, the width D2 of the radial groove may be constant or may vary. Optionally, the width of the bottom of radial groove to the width of notch can be unanimous, perhaps the bottom of radial groove to notch be binding off type or uncovered type, and at this moment, the width of radial groove is variable, according to the utility model discloses a some embodiments, the width D2 of radial groove satisfies 0.1mm and is less than or equal to D1 and is less than or equal to 2mm.

According to some embodiments of the present invention, the shape and the structure of the circumferential groove are not particularly limited, and may be a plurality of wave segments, broken line segments or curves that are continuous in the circumferential direction to adapt to different working conditions. As shown in fig. 7 and 8, the first circumferential groove may be configured in a wave shape, and the second circumferential groove may be configured in a wave shape, and according to the sizes of the first seal ring 3 and the second seal ring 4, and the kinds of different media and the distribution of the high pressure side and the low pressure side, a wave-shaped circumferential groove protruding toward the radially outer portion may be provided, and a wave-shaped circumferential groove protruding toward the radially inner portion may be provided. The circumferential groove is wavy, so that the range of fluid pressure which can be kept by the circumferential groove is larger, the circumferential groove has the effect which can be achieved by a certain radial groove, and the range of fluid pressure change which can be controlled by the circumferential groove is enlarged. In the machining process, machining the wavy circumferential groove is more efficient than machining the annular circumferential groove and the radial groove simultaneously.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. An end face seal assembly, comprising:

a first seal ring formed with a first end face;

the second sealing ring is provided with a second end face opposite to the first end face, and a sealing gap is formed between the first end face and the second end face; wherein

At least one of the first end surface and the second end surface is provided with a circumferential groove, at least one of the first end surface and the second end surface is provided with a radial groove, and the circumferential groove and the radial groove are used for controlling the position of fluid phase change in the sealing gap;

the circumferential groove is configured in plural, and the plural circumferential grooves are configured as concentric circles around the rotation center of the first seal ring.

2. The face seal assembly of claim 1 wherein said radial slot is located on a high pressure side of said circumferential slot.

3. The face seal assembly of claim 2 wherein said radial slots are configured in plurality and a plurality of said radial slots are spaced circumferentially of said first and/or second face, each of said plurality of radial slots communicating with said circumferential slot.

4. The face seal assembly of claim 3 wherein said circumferential groove includes a plurality of circumferentially spaced connecting segments, each communicating with one or more of said radial grooves.

5. The face seal assembly of claim 3 wherein the circumferential groove is contoured to undulate about a center of rotation of the first seal ring, each of the radial grooves communicating with an end of the circumferential groove radially closest to the high pressure side.

6. The face seal assembly of claim 1 wherein said radial slot comprises:

a plurality of first radial grooves configured adjacent to a high pressure side, the plurality of first radial grooves being circumferentially spaced apart;

a second radial groove configured in plurality adjacent to a low pressure side, the second radial grooves being arranged at intervals in a circumferential direction, the first radial groove being arranged circumferentially staggered with respect to the second radial groove.

7. The face seal assembly of claim 1 wherein said circumferential grooves comprise a high pressure side circumferential groove and a low pressure side circumferential groove, said radial grooves being disposed on the high pressure side of said high pressure side circumferential groove and/or between said high pressure side circumferential groove and said low pressure side circumferential groove and/or on the low pressure side of said low pressure side circumferential groove.

8. The face seal assembly of claim 7 wherein the high pressure side circumferential groove and/or the low pressure side circumferential groove are configured in a wave shape surrounding a center of rotation of the first seal ring.

9. The face seal assembly of claim 1 wherein the circumferential groove has a depth d1 and the radial groove has a depth d2 and satisfies: d1 is more than or equal to 0.05mm and less than or equal to 2mm, and d2 is more than or equal to 0.05mm and less than or equal to 2mm.

10. The face seal assembly according to claim 1, wherein the circumferential groove has a width D1, the radial groove has a width D2, and: d1 is more than or equal to 0.1mm and less than or equal to 2mm, and D2 is more than or equal to 0.1mm and less than or equal to 2mm.

11. The face seal assembly of claim 1 wherein the circumferential groove is configured as a plurality of undulating, broken or curved lines that are circumferentially continuous.

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