CN114857272A - End face seal assembly - Google Patents
End face seal assembly Download PDFInfo
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- CN114857272A CN114857272A CN202210344681.8A CN202210344681A CN114857272A CN 114857272 A CN114857272 A CN 114857272A CN 202210344681 A CN202210344681 A CN 202210344681A CN 114857272 A CN114857272 A CN 114857272A
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- face
- pressure side
- radial
- circumferential groove
- groove
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
- Sealing Devices (AREA)
Abstract
The invention discloses an end face seal assembly, which comprises: 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 extending from a high-pressure side to a low-pressure side 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, the circumferential groove and the radial groove are both positioned between a high-pressure side and a low-pressure side to control the position of fluid phase change in the sealing gap, and the radial groove is arranged on the low-pressure side of the circumferential groove. The end face sealing assembly can effectively control the potential position of phase change, enables the phase change to occur in a smaller area, improves the actual end face specific pressure of sealing and improves the bearing capacity of sealing.
Description
Technical Field
The invention relates to the technical field of mechanical sealing, in particular to an end face sealing assembly.
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 some designs adopt non-contact end surface sealing of taper and local deep grooves, and the aim is to improve the opening force by using the hydrostatic pressure effect so as 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 a face seal assembly to address the above-mentioned problems.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide an end face seal assembly, which can improve the pressure distribution in the seal gap, so that the local pressure on the seal end face is kept above the saturated vapor pressure of the fluid in a radially wider range, limit the potential position of the phase change, enable the phase change to occur in a smaller area, reduce the end face specific pressure of the seal, improve the seal bearing capacity, protect the end face in the low-speed operation and start-stop stages, and reduce unnecessary wear.
An end face seal assembly according to an embodiment of the invention 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 extending from a high-pressure side to a low-pressure side 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, the circumferential groove and the radial groove are both positioned between a high-pressure side and a low-pressure side to control the position of fluid phase change in the sealing gap, and the radial groove is arranged on the low-pressure side of the circumferential groove.
The end face seal assembly is characterized in that the radial grooves are arranged on the low-pressure side of the circumferential grooves, and along with the flowing of fluid on the outer side of the seal end face into the seal gap along the radial direction, the pressure in the seal gap is reduced along the radial direction and stops being reduced after the fluid flows into the circumferential deep grooves, and the pressure of the fluid within a certain width is stabilized due to the arrangement of the series of radial grooves. The pressure reduction is limited in such a way that the radial pressure is kept over a wider range above the saturated vapor pressure of the fluid, thereby controlling the potential location where the phase change occurs and allowing the phase change to occur in a smaller area. The pressure reduction is limited, and meanwhile, the actual end face specific pressure of the seal is reduced, so that the bearing capacity of the seal is improved, the seal low-speed operation and the start-stop stage have better performance, the end face is protected, and unnecessary abrasion is reduced.
According to some embodiments of the invention, the circumferential groove is configured in a plurality, the plurality of circumferential grooves surrounds a center of rotation of the first seal ring, and any one of the radial grooves is located on a low pressure side of the circumferential groove adjacent to a high pressure side.
According to some embodiments of the invention, the radial groove is provided between two adjacent circumferential grooves and/or on a low pressure side of the circumferential groove adjacent to the low pressure side.
According to some embodiments of the present invention, the radial grooves are configured in plural sets arranged in the radial direction in sequence, each set of the radial grooves has plural ones arranged at intervals in the circumferential direction, and the circumferential groove is arranged in sequence with the radial grooves in the radial direction.
According to some embodiments of the invention, two adjacent sets of the radial slots are circumferentially staggered.
According to some embodiments of the invention, at least one set of the circumferential grooves is configured in a wave shape that continuously protrudes in the circumferential direction toward the high pressure side or the low pressure side.
According to some embodiments of the invention, the circumferential groove comprises: a high pressure side circumferential groove configured in a wavy shape which continuously protrudes toward a high pressure side in the circumferential direction, and a low pressure side circumferential groove configured in a wavy shape which continuously protrudes toward a low pressure side in the circumferential direction.
According to some embodiments of the present invention, the high-pressure side circumferential groove has a plurality of first wave trough portions adjacent to the low-pressure side, the low-pressure side circumferential groove has a plurality of second wave trough portions adjacent to the high-pressure side, the first wave trough portions and the second wave trough portions are arranged corresponding to each other in the radial direction, and a radial groove is arranged between each first wave trough portion and each second wave trough portion.
According to some embodiments of the invention, the radial groove is provided in the first end face and/or the second end face.
According to some embodiments of the invention, the circumferential groove has a depth d1, the radial groove has a depth d2, and: 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 2 mm.
According to some embodiments of the invention, 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 2 mm.
According to some embodiments of the invention, the circumferential groove is configured as a plurality of wavy segments, broken line segments or curved lines which 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 one 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 one embodiment of the present invention;
FIG. 6 is a schematic plan view of circumferential and radial slots 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 slots of another embodiment of the present invention;
FIG. 9 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 10 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 11 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 12 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 13 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 14 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 15 is a schematic plan view of circumferential and radial slots of another embodiment of the present invention;
FIG. 16 is a pressure profile of an end face seal assembly according to an embodiment of the present invention;
fig. 17 is a schematic illustration of the phase distribution of an end face seal assembly according to 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; 10: a first circumferential groove; 11: a first wave trough portion; 12: a second trough.
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 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.
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 and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and 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 considered 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 expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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.
In the related art, a mechanical seal end face structure is a basic key component in various rotary fluid machines. 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. 1-17.
The end face sealing assembly comprises a first sealing ring 3 and a second sealing ring 4, wherein a first end face is formed on the first sealing ring 3, a second end face opposite to the first end face is formed on the second sealing ring 4, a sealing gap extending from a high pressure side to a low pressure side is formed between the first end face and the second end face, fluid can flow into the sealing gap to form a fluid film, a circumferential groove is formed in at least one of the first end face and the second end face, a radial groove is formed in at least one of the first end face and the second end face, the circumferential groove and the radial groove are both located between the high pressure side and the low pressure side to control the phase change position of the fluid in the sealing gap, and the radial groove is arranged on the low pressure side of the circumferential groove.
The radial groove referred to herein is provided on the low-pressure side of the circumferential groove, and means that when fluid flows into the seal gap from the outside of the seal end face, the fluid flows into the circumferential groove first and then flows into the radial groove. Referring to fig. 5, when the face seal assembly includes only one circumferential groove and one radial groove, the fluid flows from the outside of the seal face into the seal gap, first into the circumferential groove, then into the radial groove, and finally into the seal dam 7 between R0 and R4, and between R1 and R3; when the end face sealing assembly comprises a plurality of circumferential grooves or a plurality of radial grooves or simultaneously comprises a plurality of circumferential grooves and radial grooves, fluid flows into the circumferential grooves firstly and then flows into the radial grooves when flowing into the sealing gap from the outer side of the sealing end face, and then flows into other groove bodies on the low pressure side of the radial grooves. Note that R0 represents an inner radius of a seal end surface where the first seal ring and the second seal ring are bonded to each other, R1 represents an outer radius of a seal end surface where the first seal ring and the second seal ring are bonded to each other, R2 represents an inner radius of the high-pressure-side circumferential groove 6, and R3 represents an outer radius of the high-pressure-side circumferential groove 6.
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. In the end face seal assembly provided by the invention, the circumferential groove is formed on at least one of the first end face and the second end face, the radial groove is formed on at least one of the first end face and the second end face, and the radial groove is arranged on the low-pressure side of the circumferential groove, referring to fig. 16, along with the fact that fluid on the outer side of the seal end face flows into the seal gap along the radial direction, the pressure in the seal gap is reduced along the radial direction, and the reduction is stopped after the fluid flows into the circumferential deep groove, and because the arrangement of a series of radial grooves enables the pressure of the fluid within a certain width to be stable. The manner in which the pressure drop is limited is such that the radial pressure remains above the fluid saturation vapor pressure over a wider range, see fig. 17, thereby controlling the potential location at which the phase change occurs, causing the phase change to occur in a smaller area. It should be noted that if phase change occurs in the seal gap, the area ratio of the vapor phase is relatively large, since the viscosity of the gas is much less than that of the liquid, the large-area vaporization region is not favorable for sealing and maintaining the working state, and the phase change is limited in the limited region, which is equivalent to enlarging the lubrication region, thereby effectively reducing the abrasion caused by the contact between the first end face and the second end face, and remarkably prolonging the service life of the end face seal assembly. The pressure reduction is limited, and meanwhile, the actual end face specific pressure of the seal is reduced, so that the bearing capacity of the seal is improved, the seal low-speed operation and the start-stop stage have better performance, the end face is protected, and unnecessary abrasion is reduced.
According to some embodiments of the present invention, when the end face seal assembly is used for sealing a rotary machine, the rotary machine further includes a shaft 1 and a housing 2, the bottom of the housing 2 is provided with a hole, the shaft 1 of the rotary machine penetrates through the hole, the housing 2 is fixedly connected with a first seal ring 3, the first seal ring 3 is formed with a first end face, a second seal ring 4 is connected to the shaft 1 and can rotate around the shaft 1, the second seal ring 4 is formed with a second end face, and the first end face of the first seal ring 3 is in face fit with the second end face of the second seal 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 seal ring are not particularly limited, for example, referring to fig. 1, the first radial groove 5 and the high-pressure side circumferential groove 6 may be both provided on the second seal ring 4; referring to fig. 2, the first radial groove 5 and the high pressure side circumferential groove 6 may be both provided on the first seal ring 3; referring to fig. 3, a first radial groove 5 is provided on the second seal ring 4, and a high-pressure side circumferential groove 6 is provided on the first seal ring 3; referring to fig. 4, a first radial groove 5 is provided on the first seal ring 3 and a high-pressure side circumferential groove 6 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 invention, the circumferential groove may be a continuous groove or a discontinuous groove, and referring to fig. 6, the circumferential groove comprises a plurality of circumferentially spaced connecting segments, each connecting segment communicating with one or more radial grooves on the low pressure side. Specifically, the circumferential groove on the sealing ring may be formed by a plurality of mutually disconnected connecting segments, each connecting segment is a segment of groove, and one end of the radial groove may communicate with the low-pressure side of each circumferential groove connecting segment to form a circumferentially arranged T-shaped groove.
According to some embodiments of the invention, the circumferential groove may be configured in a plurality surrounding a center of rotation of the first seal ring, any one of the radial grooves being located on a low pressure side of the circumferential groove adjacent to the high pressure side. For example, referring to FIG. 8, two circumferential grooves are configured on the face seal assembly, and referring to FIG. 12, three circumferential grooves are configured on the face seal assembly. It should be noted that, there is a pressure loss along the way when the fluid flows into the seal gap from the outside of the seal end face, during the whole flowing process, the pressure is in a decreasing trend, the pressure of the fluid stops decreasing after flowing into the circumferential groove, and the pressure of the fluid is stabilized in a certain range due to the arrangement of a series of radial grooves, that is, the pressures on both sides of the circumferential groove are different, the upstream direction of the fluid is the high pressure side of the circumferential groove, the downstream direction of the fluid is the low pressure side of the circumferential groove, and one or more sets of radial grooves are all located on the low pressure side of the circumferential groove into which the fluid first flows. Therefore, when the fluid flows on the sealing end surface, the plurality of circumferential grooves are arranged on the sealing end surface, so that the area of the fluid with the pressure above the saturated vapor pressure of the fluid is enlarged, namely, a high-pressure area in the sealing gap is increased, the potential position of the phase change is further controlled, and the area of the phase change is reduced.
According to some embodiments of the invention, the radial groove may be arranged between two adjacent circumferential grooves and/or on the low pressure side of a circumferential groove adjacent to the low pressure side. Specifically, referring to fig. 11, the first radial groove 5 is provided between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9, or the radial groove is provided on the low-pressure side (not shown in the drawings) of the low-pressure side circumferential groove, or, referring to fig. 8, the first radial groove 5 is provided between the high-pressure side circumferential groove 6 and the low-pressure side circumferential groove 9, and the second radial groove 6 is provided on the low-pressure side of the low-pressure side circumferential groove 9. Therefore, the radial grooves can keep the pressure of fluid flowing out of the circumferential grooves within a certain width range, even if the fluid is kept above the saturated vapor pressure, the potential position of phase change is controlled, the area of the phase change is reduced, the sealing effect is improved, the areas of the phase change can be further reduced by the arrangement of the plurality of groups of radial grooves, the area of the fluid in the liquid state is increased, the lubrication area is increased, the specific pressure of the end face is effectively reduced, the abrasion caused by contact between the first end face and the second end face is reduced, and the service life of the end face sealing assembly is remarkably prolonged.
According to some embodiments of the present invention, referring to fig. 12, the radial grooves are configured in plural sets arranged in sequence in the radial direction, each set having a plurality of the radial grooves arranged at intervals in the circumferential direction, the circumferential grooves being arranged in sequence with the radial grooves in the radial direction. Specifically, the radial grooves and the circumferential grooves are arranged in this order in the radial direction, that is, after the fluid flows into the seal gap from the outside of the seal end face, the fluid flows into the high-pressure-side circumferential groove 6, the first radial groove 5, the first circumferential groove 10, the second radial groove 8, the low-pressure-side circumferential groove 9, and the like in this order.
Therefore, potential areas of phase change can be further reduced by the multiple groups of radial grooves and the multiple groups of circumferential grooves, the area of a liquid area of fluid is increased, a lubricating area is increased, abrasion caused by contact between the first end face and the second end face is effectively reduced, and the service life of the end face sealing assembly is remarkably prolonged.
According to some embodiments of the invention, with reference to fig. 8, two adjacent sets of radial slots are circumferentially staggered, i.e. the first radial slots 5 are directly opposite the gaps formed by two adjacent second radial slots 8, the second radial slots 8 being also directly opposite the gaps formed by two adjacent first radial slots 5. Specifically, the first radial groove 5 is provided between two adjacent circumferential grooves, the second radial groove 8 is provided on the low pressure side of the low pressure side circumferential groove 9, and the seal dam 7 is formed between R0 and R4, and between R1 and R3, and functions as a throttle and a parking seal.
According to some embodiments of the invention, at least one set of circumferential grooves is configured in a wave shape that continuously protrudes in the circumferential direction towards the high-pressure side or the low-pressure side, in particular, with reference to fig. 7, the face seal assembly is provided with only one circumferential groove, which may be considered as a high-pressure side circumferential groove 6, the high-pressure side circumferential groove 6 may be configured in a wave shape that continuously protrudes in the circumferential direction towards the high-pressure side, or the high-pressure side circumferential groove 6 may be configured in a wave shape that continuously protrudes in the circumferential direction towards the low-pressure side (not shown in the figure); according to other embodiments of the present invention, referring to fig. 9, the end face seal assembly is provided with two circumferential grooves, one being the high pressure side circumferential groove 6 and the other being the low pressure side circumferential groove 9, both of which are configured in a wave shape continuously protruding toward the high pressure side in the circumferential direction; according to other embodiments of the present invention, referring to fig. 10, the end face seal assembly is provided with two circumferential grooves, one being a high pressure side circumferential groove 6 and the other being a low pressure side circumferential groove 9, the high pressure side circumferential groove 6 being configured in a wave shape continuously protruding toward the high pressure side in the circumferential direction, or the low pressure side circumferential groove 9 being configured in a wave shape continuously protruding toward the high pressure side in the circumferential direction (not shown in the figure); according to other embodiments of the present invention, referring to fig. 14, the end face seal assembly is provided with three circumferential grooves, a high pressure side circumferential groove 6, a low pressure side circumferential groove 9, and a first circumferential groove 10, respectively, the high pressure side circumferential groove 6 being configured in a wave shape that continuously protrudes in the circumferential direction toward the high pressure side.
According to some embodiments of the present invention, the projecting direction of the waves of the plurality of wavy circumferential grooves may be non-uniform, and referring to fig. 13, the circumferential grooves include a high pressure side circumferential groove 6 and a low pressure side circumferential groove 9, the high pressure side circumferential groove 6 may be configured in a wavy shape that continuously projects toward the high pressure side in the circumferential direction, and the low pressure side circumferential groove 9 may be configured in a wavy shape that continuously projects toward the low pressure side in the circumferential direction. The high pressure side and the low pressure side referred to herein are opposed to each other, and the pressure tends to gradually decrease as a whole in the fluid flow direction, the high pressure side circumferential groove 6 means a circumferential groove provided upstream in the fluid flow direction, the low pressure side circumferential groove 9 means a circumferential groove provided downstream in the fluid flow direction, and the high pressure side circumferential groove 6 is configured in a wave shape protruding toward the high pressure side.
According to some embodiments of the present invention, referring to fig. 13, the high-pressure side circumferential groove 6 has a plurality of first wave trough portions 11 adjacent to the low-pressure side, the low-pressure side circumferential groove 9 has a plurality of second wave trough portions 12 adjacent to the high-pressure side, the first wave trough portions 11 and the second wave trough portions 12 are arranged corresponding to each other in the radial direction, and a radial groove is provided between each of the first wave trough portions 11 and the second wave trough portions 12. Specifically, the high-pressure-side circumferential groove 6 may be configured to be a wave shape continuously protruding toward the high-pressure side in the circumferential direction, both ends of each wave of the high-pressure-side circumferential groove 6 are first wave trough portions 11, the low-pressure-side circumferential groove 9 may be configured to be a wave shape continuously protruding toward the low-pressure side in the circumferential direction, both ends of each wave of the low-pressure-side circumferential groove 9 are second wave trough portions 12, when the first wave trough portions 11 and the second wave trough portions 12 are radially arranged correspondingly, the first wave trough portions 11 and the second wave trough portions 12 may communicate with each other through the first radial grooves 4, the communicated high-pressure-side circumferential groove 6, low-pressure-side circumferential groove 9, and first radial grooves 5 may form a circular groove body, and the continuous waves may form a plurality of circular rings communicating with each other.
According to some embodiments of the present invention, the radial grooves are disposed on the first end surface and/or the second end surface, specifically, the radial grooves may be disposed only on the first end surface, or the radial grooves may be disposed only on the second end surface, or both the first end surface and the second end surface are provided with radial grooves, it should be noted that the radial grooves disposed on the first end surface and the second end surface may be connected or not connected, and those skilled in the art can design according to actual needs.
According to some embodiments of the invention, referring to fig. 3, the depth d1 of the circumferential groove may be constant or may vary. Alternatively, the circumferential groove may be of the same depth in the entire circumferential direction, in which case the depth d1 of the circumferential groove is constant; the depth of the circumferential groove in the circumferential direction may also vary periodically, for example, every 60 degrees with a waviness variation, and according to some embodiments of the invention, the depth d1 of the circumferential groove satisfies 0.05mm ≦ d1 ≦ 2 mm. 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 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 flat, in which case the depth d2 of the radial groove is constant; the bottom surface of the radial groove may also be a slope, where the depth of the radial groove varies, and according to some embodiments of the present invention, the depth d2 of the radial groove satisfies 0.05mm < d2 < 2 mm. 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 invention, referring to fig. 8, the width D1 of the circumferential groove may be constant or may vary. Optionally, the circumferential groove has a uniform width in the entire circumferential direction, or the bottom to the mouth of the circumferential groove is closed or open, wherein the width of the circumferential groove in the radial direction varies, and according to some embodiments of the invention, the width D1 of the circumferential groove satisfies 0.1mm < D1 < 2 mm.
According to some embodiments of the present invention, referring to fig. 8, the width D2 of the radial slot may be constant or may vary. Alternatively, the width of the bottom of the radial slot to the width of the slot opening may be uniform, or the width of the bottom of the radial slot to the slot opening may be convergent or open, in which case the width of the radial slot varies, and according to some embodiments of the invention, the width D2 of the radial slot satisfies 0.1mm < D1 < 2 mm.
According to some embodiments of the present invention, the shape and configuration of the circumferential groove are not particularly limited, and may be a plurality of wave segments, broken line segments or curved lines which are continuous in the circumferential direction to adapt to different working conditions. As shown in fig. 9, 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, the efficiency of machining the wavy circumferential groove is high compared with the efficiency of machining the annular circumferential groove and the radial groove simultaneously.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 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 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 (12)
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 extending from a high-pressure side to a low-pressure side is formed between the first end face and the second end face; wherein
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, the circumferential groove and the radial groove are both positioned between a high-pressure side and a low-pressure side to control the position of fluid phase change in the sealing gap, and the radial groove is arranged on the low-pressure side of the circumferential groove.
2. The face seal assembly of claim 1 wherein said circumferential groove is configured in a plurality, said plurality surrounding said first seal ring center of rotation, any one of said radial grooves being located on a low pressure side of said circumferential groove adjacent a high pressure side.
3. The face seal assembly of claim 2 wherein said radial slots are disposed between adjacent two of said circumferential slots and/or on a low pressure side of said circumferential slots adjacent a low pressure side.
4. The face seal assembly of claim 3 wherein said radial slots are configured in radially sequential groups, each group of said radial slots having a plurality thereof spaced circumferentially, said circumferential slots being radially sequential with said radial slots.
5. The face seal assembly of claim 4 wherein adjacent sets of said radial slots are staggered circumferentially.
6. The face seal assembly of claim 5 wherein at least one of said circumferential grooves is configured in a wave shape that continuously projects in a circumferential direction toward either the high pressure side or the low pressure side.
7. The face seal assembly of claim 2 wherein said circumferential groove comprises: the high pressure side circumferential groove is configured in a wave shape continuously protruding toward the high pressure side in the circumferential direction, and the low pressure side circumferential groove is configured in a wave shape continuously protruding toward the low pressure side in the circumferential direction.
8. The face seal assembly according to claim 7, wherein the high-pressure-side circumferential groove has a plurality of first wave trough portions adjacent to a low-pressure side, the low-pressure-side circumferential groove has a plurality of second wave trough portions adjacent to a high-pressure side, the first wave trough portions and the second wave trough portions are arranged to radially correspond to each other, and a radial groove is provided between each of the first wave trough portions and the second wave trough portions.
9. The face seal assembly of claim 1 wherein the radial groove is disposed in the first face and/or the second face.
10. 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 2 mm.
11. The face seal assembly of claim 1 wherein the circumferential groove has a width D1 and the radial groove has a width 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 2 mm.
12. The face seal assembly of claim 1 wherein said circumferential groove is configured as a plurality of undulating, broken or curved segments that are circumferentially continuous.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344681.8A CN114857272B (en) | 2022-03-31 | 2022-03-31 | End face seal assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210344681.8A CN114857272B (en) | 2022-03-31 | 2022-03-31 | End face seal assembly |
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| CN114857272A true CN114857272A (en) | 2022-08-05 |
| CN114857272B CN114857272B (en) | 2023-06-02 |
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| CN209444814U (en) * | 2019-01-16 | 2019-09-27 | 东营海森密封技术有限责任公司 | A kind of seal face structure of bi-directional rotational device |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07260009A (en) * | 1994-03-22 | 1995-10-13 | Nippon Pillar Packing Co Ltd | Non-contact-type shaft sealing device |
| JPH08277941A (en) * | 1995-04-03 | 1996-10-22 | Mitsubishi Heavy Ind Ltd | Mechanical seal |
| US20020093141A1 (en) * | 2001-01-18 | 2002-07-18 | Yuming Wang | Bi-direction rotatable face seal with spiral grooves |
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| CN114857272B (en) | 2023-06-02 |
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