CN119934239A - A leak-free sealing device - Google Patents
A leak-free sealing device Download PDFInfo
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- CN119934239A CN119934239A CN202510421519.5A CN202510421519A CN119934239A CN 119934239 A CN119934239 A CN 119934239A CN 202510421519 A CN202510421519 A CN 202510421519A CN 119934239 A CN119934239 A CN 119934239A
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Abstract
The invention provides a leakage-free sealing device which is used for sealing a shaft structure and comprises a mechanical seal inner sealing component sleeved on the periphery of the shaft, wherein a leakage absorbing component is sleeved on the periphery of the mechanical seal inner sealing component, the leakage absorbing component comprises a cavity gland provided with a hollow cavity, the cavity gland is annular, the side wall of the cavity gland is provided with a drainage structure for communicating the hollow cavity with an oil way of the mechanical seal inner sealing component, a polymer filling block for absorbing liquid is arranged in the hollow cavity of the cavity gland, and the conventional leakage oil liquid of the mechanical seal inner sealing component under normal working conditions is led into the cavity of the cavity gland to be absorbed through the arrangement of the drainage structure, so that observable leakage does not occur outside the shaft structure in a certain period of time or in a maintenance period of equipment, and the polymer filling block for absorbing liquid is cleaned or replaced during fixed period maintenance.
Description
Technical Field
The invention relates to the technical field of sealing structures of aerospace or deep sea operation equipment, in particular to a leakage-free sealing device.
Background
At present, in various detection operation machines related to the aerospace field and the deep sea operation field, a rotating shaft or other similar revolving body structures such as a speed reducer, auxiliary power equipment, a starter, a detection device driving motor and the like of a turboshaft turboprop are easy to cause problems in sealing when the detection operation machines face severe working conditions.
For example, the aero-engine is easy to generate micro deformation due to high temperature in the later stage of the service life, the leakage condition of the sealing part is easy to occur, trace medium leakage can be found at the machine shell during maintenance, a wiping step is required to be added, and the maintenance flow is increased. In deep sea mechanical equipment, the mechanical seal of the driving device is generally only suitable for the pressure working condition of 6MPa to 15MPa, the seawater is arranged on the outer side of the motor, the mechanical seal plays a role of isolating the seawater from the rotor inside the motor, if the mechanical seal leaks, particularly under the high pressure working condition, the seawater enters the motor cavity to cause the motor to be burnt out in a short circuit, and in order to avoid the situation, the structure nearby the motor shaft is required to be cleaned frequently, so that the maintenance frequency and the maintenance procedure of the motor are increased.
The traditional mechanical seal allows visible leakage according to national standard requirement GB/T4127, and the allowable leakage value is that when the medium is liquid, the allowable leakage flow rate range of a sealing structure with the environmental pressure range of 0-5Mpa and the shaft diameter of less than 50mm is within 3ml/h, and when the shaft diameter range of the sealing structure is 50mm less than or equal to d less than or equal to 120mm, the allowable leakage flow rate is 3ml/h-5ml/h. When the environment pressure is 5MPa-10MPa and the shaft diameter of the sealing structure is less than 50mm, the allowable leakage flow rate is within 15ml/h, and when the shaft diameter of the sealing structure is more than or equal to 50mm and less than or equal to 120mm, the allowable leakage flow rate is within 15ml/h-20 ml/h. Obviously, the conventional national standard requirement cannot meet the requirement of high tightness of mechanical equipment in the fields of aerospace and deep sea, and in the two fields, due to the consideration of system safety, the technical requirement of no macroscopic leakage in a certain inspection and maintenance period exists.
In summary, the sealing design of the existing mechanical equipment rotating piece has the problem that the technical requirement of no visible leakage in the inner period in the aerospace and deep sea fields is difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problem that the sealing design of the existing mechanical equipment rotating piece is difficult to meet the technical requirement of no visible leakage in the inner period in the aerospace and deep sea fields.
In order to solve the problems, the invention provides a leakage-free sealing device which is used for sealing a shaft structure and comprises a mechanical seal inner sealing component sleeved on the periphery of the shaft, wherein a leakage absorption component is sleeved on the outer periphery of the mechanical seal inner sealing component, the leakage absorption component comprises a cavity gland provided with a hollow cavity, the cavity gland is annular, the inner peripheral wall of the cavity gland is provided with a drainage structure which is used for communicating the hollow cavity with an oil way of the mechanical seal inner sealing component, and a polymer filling block used for absorbing liquid is arranged in the hollow cavity.
The novel sealing design mainly comprises a mechanical sealing inner sealing component and a leakage absorbing component which are sleeved on the periphery of a shaft, wherein the mechanical sealing inner sealing component and the leakage absorbing component are connected with each other, through a polymer filling block in a cavity gland structure of the leakage absorbing component and the arrangement of a drainage structure, conventional leakage oil liquid of the mechanical sealing inner sealing component under normal working conditions is introduced into a cavity of the cavity gland to be absorbed, when normal engine oil liquid leakage on the periphery of shaft equipment in the aerospace field reaches a position where the outer wall of the shaft is easy to store and leak, the oil liquid enters the cavity gland structure through the drainage structure, and the phenomenon that impurities on the surface of the shaft store or permeate into the inside of a motor and the position where the oil liquid should not exist is avoided.
The structure ensures that observable oil leakage does not occur outside the shaft structure in a certain time period or in the overhaul period of equipment, and only the polymer filling blocks for absorbing liquid are cleaned or replaced when constant period overhaul is carried out, so that the problem that the sealing design of the rotating piece of the traditional mechanical equipment is difficult to meet the technical requirement of no visible leakage in the inner period in the aerospace and deep-sea fields is effectively solved.
As the preferable scheme, the mechanical seal inner sealing assembly comprises a first shaft sleeve, a first movable ring and a first static ring, wherein the first movable ring and the first static ring are sleeved on the first shaft sleeve, an annular protruding part is arranged on the outer peripheral wall of the first shaft sleeve, the first movable ring is fixedly installed on the protruding part through a first pin, the first static ring is circumferentially positioned and connected with the inner peripheral wall of the cavity gland, the first static ring is elastically matched with the inner peripheral wall of the cavity gland through an axially arranged compression spring, and the first movable ring and the first static ring are abutted against the end face of the elastic force provided by the compression spring.
The structure of the mechanical inner sealing assembly is optimized by the design, the mechanical inner sealing assembly mainly comprises a first movable ring and a first static ring part which are sleeved on the first shaft sleeve, one of the first movable ring and the first static ring part is fixedly arranged on the opening edge of an annular mounting groove on the outer peripheral surface of the first shaft sleeve, the other of the first movable ring and the first static ring part is fixedly arranged by uniformly distributed pins, the other of the first movable ring and the cavity gland are elastically matched with each other, the first static ring and the cavity gland are circumferentially positioned through pins to prevent relative rotation, and a compression spring is arranged between the first static ring and the cavity gland to provide elasticity to mutually support the end faces of the first static ring and the first movable ring to tightly obtain a basic mechanical sealing effect.
As the preferable scheme, the inner peripheral wall of cavity gland is provided with annular heavy groove, be provided with annular ring seat structure in the heavy groove, ring seat structure passes through second pin and cavity gland circumference location cooperation, compression spring's both ends respectively with ring seat structure terminal surface with heavy groove offsets, first quiet ring is fixed in the terminal surface that ring seat structure deviates from compression spring one side through the installation of third pin. The design optimizes the matching mode between the first stationary ring and the cavity gland, and an annular ring seat structure is arranged between the inner side edge of the cavity gland, namely the cavity gland and the first shaft sleeve and is used for installing the first stationary ring, and the ring seat and the first stationary ring are circumferentially fixed through pins.
Preferably, one end of the hollow cavity of the cavity gland is closed, the other end of the hollow cavity is open, and a gland cover plate for closing the hollow cavity is detachably arranged at the open end of the hollow cavity. This design optimizes the structure of cavity gland, and cavity gland is one end closure other end open-ended structure to cooperation open-ended size shape sets up the gland apron and is used for closing the opening, and the gland apron is demountable installation, and concrete accessible screw etc. mode is carried out, and this design can be convenient overhauls the change to the polymer filling block that fills in the cavity gland, greatly reduced the maintenance degree of difficulty.
The cavity gland is characterized in that the cavity gland cover plate is provided with a cavity gland cover plate, the cavity gland cover plate is provided with a cavity gland, the cavity gland is axially positioned, and the cavity gland is axially positioned. The design optimizes the matching mode between the cavity gland and the first shaft sleeve, and sets an annular sealing plate structure aiming at the gland cover plate, the installation and fixation position of the gland cover plate can be stabilized through the design, the annular sealing plate structure is directly fixed with the cavity gland through screw installation, a positioning ring is sleeved at the corresponding position of the outer peripheral surface of the first shaft sleeve, the end face of the positioning ring is propped against the annular sealing plate structure to axially position the cavity gland, the positioning ring is preferably arranged with the shaft through the structure of a pin or a screw, the structure of a through hole on the side wall of the first shaft sleeve can be further adopted, the pin or the screw device for positioning the positioning ring is directly fixed with the shaft body in the first shaft sleeve, and the first shaft sleeve can be axially positioned through the mode.
As a preferable scheme, an annular blocking sealing structure is arranged between the two axial ends of the cavity gland and the first shaft sleeve, the blocking sealing structure at one end of the gland cover plate is a lip-shaped sealing piece, one sealing surface of the lip-shaped sealing piece is attached to the peripheral surface of the first shaft sleeve, and the other sealing surface of the lip-shaped sealing piece is attached to a gap between the cavity gland and the annular sealing plate structure. The sealing leakage-proof design of the two axial ends of the whole sealing device is designed and optimized, the key position of sealing is that a blocking sealing structure at one end of a cavity gland is a lip-shaped sealing piece at the joint position of a first shaft sleeve and the cavity gland, two adjacent sealing end faces of the lip-shaped sealing piece are respectively attached to the outer peripheral face of the first shaft sleeve and the inner end face of an annular sealing plate structure to achieve sealing, namely, the arrangement mode of the lip-shaped sealing piece is just opposite to the conventional arrangement direction of the lip-shaped sealing piece, the blocking sealing piece at the closed end of the cavity gland is a framework oil seal structure, and a baffle ring or annular gasket type structure is preferably arranged at the side edge of the corresponding end of the cavity gland to facilitate the matching of the end faces and the oil seal structure.
As a preferable scheme, a protruding first shaft shoulder structure is arranged at the position, adjacent to the lip-shaped sealing piece, of the outer peripheral surface of the first shaft sleeve, the first shaft shoulder structure is opposite to the drainage structure, and leakage liquid is introduced into the drainage structure through an oil way of the outer peripheral surface of the first shaft sleeve by the first shaft shoulder structure. The design optimizes the inner space in the blocking sealing structure at two ends, optimizes the structure of the surface structure of the first shaft sleeve in the space, and sets a first shaft shoulder structure which is suitable for high protrusion to block the leakage oil path on the outer peripheral surface of the first shaft sleeve, so that the leakage medium at the end face can be effectively blocked, enters the cavity of the cavity gland through a small hole slot or other forms of drainage structures, and is latched by the polymer filling block.
As the preferable scheme, the mechanical seal inner seal assembly comprises a second sleeve, a second movable ring, a second stationary ring and a stationary ring seat, wherein the second sleeve and the second movable ring are sleeved on the periphery of the shaft, one end of the cavity gland is provided with a stepped annular slot, the stationary ring seat is sleeved on the periphery of the second sleeve and inserted in the annular slot of the cavity gland, one side end face of the stationary ring seat is provided with an annular mounting groove, the periphery wall of the second stationary ring is in interference fit with the inner peripheral wall of the mounting groove, a compression spring is arranged in the annular slot of the cavity gland, two ends of the compression spring are respectively abutted against the cavity gland and the stationary ring seat along the axial direction, and the end faces of the second stationary ring and the second movable ring are used for providing elasticity to be abutted against.
The design provides another optional mechanical seal inner sealing assembly, the design is suitable for an aerospace working environment, a second movable ring is directly sleeved on the outer peripheral surface of a shaft, one side end face of the second movable ring is simultaneously propped against the end face of a shaft sleeve and the end face of a stationary ring at different positions, the stationary ring is inserted into an annular groove formed between a stationary ring seat and the shaft sleeve, an annular slot is formed in the inner edge of one side of a cavity gland, which is attached to the second shaft sleeve, of the stationary ring seat, one end of the cavity gland, which is smaller in radial dimension, is inserted into the slot, one end of the cavity gland, which is larger in radial dimension, is provided with an annular mounting groove, the stationary ring is inserted into the slot, a plurality of spring seats are arranged on the end face of the cavity gland at intervals at preset intervals so as to set compression springs, and elasticity for propping the stationary ring against the movable ring is provided.
As a preferable scheme, a runner groove for guiding leakage is arranged between the inner peripheral surface of each of the second stationary ring and the stationary ring seat and the second sleeve, and a convex second shoulder structure is arranged on the outer peripheral surface of the second sleeve at a position corresponding to the drainage structure on the cavity gland and used for blocking an oil way of the outer peripheral surface of the second sleeve.
The design further optimizes the design of leaking guiding inside the mechanical seal inner sealing assembly, optimizes the design of introducing leaking liquid into the inner space of the cavity gland, sets up runner grooves at the inner edge positions of the second stationary ring and the stationary ring seat which are connected with the second sleeve, and is used for guiding oil, the runner grooves are arranged on the extending track of the outer peripheral surface of the second sleeve and correspond to the position of the cavity gland guiding structure, so as to block the leaking oil way on the second sleeve, further enable the end face leaking medium to be effectively blocked, and be helpful for oil to enter the cavity in the cavity gland through the small holes of the guiding structure.
As a preferable scheme, the inner side wall of the hollow cavity of the cavity gland is integrally connected with a supporting rib or a supporting grid structure for enhancing the bearing capacity of the cavity gland. The design further optimizes the cavity internal structure of the cavity gland, the inner side wall of the cavity is provided with a supporting structure for supporting rib plates or a honeycomb-shaped and three-dimensional grid-shaped structure for supporting the cavity in a filling manner, the design is mainly used for enhancing the bearing strength of the cavity gland with the hollow thin wall, the compression damage is avoided, and the structure occupies the volume of a polymer filling block in the cavity as little as possible.
Drawings
FIG. 1 is a schematic cross-sectional view of a leak-free sealing apparatus according to the present invention;
FIG. 2 is a schematic view of a partially enlarged cross-sectional structure of the leak-free sealing apparatus of FIG. 1;
FIG. 3 is a schematic cross-sectional view of another leak-free sealing apparatus according to the present invention;
FIG. 4 is a schematic view of a partially enlarged cross-sectional structure of the leak-free sealing apparatus of FIG. 3;
wherein, in fig. 1-4:
1. The sealing device comprises a cavity gland, 1-1, a drainage structure, 1-2, a gland cover plate, 1-3, an annular sealing plate structure, 1-4, a hollow cavity, 1-5, a countersink, 2, a first shaft sleeve, 2-1, a protruding part, 2-2, a second shaft sleeve, 3, a first movable ring, 3-2, a second movable ring, 4, a first static ring, 4-2, a second static ring, 5, a ring seat structure, 5-2, a static ring seat, 6, a compression spring, 7, a positioning ring, 8, a blocking sealing structure, 9-1, a first pin, 9-2, a second pin, 9-3, a third pin, 10-1, a first shaft shoulder structure, 10-2, a second shaft shoulder structure, 11, a clamping ring, 12, a screw, 13, a runner groove, 14 and a sealing collar.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Before describing the working principle of the present invention in detail, it should be further explained that in the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have specific orientations, be configured and operated in specific orientations, 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.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "configured to," "connected," and the like are to be construed broadly as meaning, for example, "connected," either permanently connected, detachably connected, or integrally connected, mechanically connected, directly connected, indirectly connected via an intervening medium, or welded together. It will be understood by those of ordinary skill in the art that the terms described above are in the specific sense of the present invention.
Referring to fig. 1 and 2, the following embodiments are described, in which fig. 1 is a schematic cross-sectional structure of a leak-free sealing device provided by the present invention, and fig. 2 is a schematic cross-sectional partial enlarged structure of the leak-free sealing device in fig. 1.
The embodiment of the invention provides a leakage-free sealing device, which is used for sealing a shaft structure and comprises a mechanical seal inner sealing component sleeved on the periphery of the shaft, wherein a leakage absorption component is sleeved on the periphery of the mechanical seal inner sealing component, the leakage absorption component comprises a cavity gland 1 provided with a hollow cavity body 1-4, the cavity gland 1 is annular, the inner peripheral wall of the cavity gland is provided with a drainage structure 1-1 which is used for communicating the hollow cavity body 1-4 with an oil way of the mechanical seal inner sealing component, and a polymer filling block used for absorbing liquid is arranged in the hollow cavity body 1-4.
The novel sealing design mainly comprises a mechanical sealing inner sealing assembly sleeved on the periphery of a shaft and a leakage absorbing assembly, wherein the mechanical sealing inner sealing assembly and the leakage absorbing assembly are connected with each other, and conventional leakage oil liquid of the mechanical sealing inner sealing assembly under normal working conditions is introduced into a cavity of the cavity gland 1 for absorption through a polymer filling block in the cavity gland 1 structure of the leakage absorbing assembly and the arrangement of the drainage structure 1-1, so that observable oil liquid leakage condition is not generated outside the shaft structure in a certain period of time or in a maintenance period of equipment, and only the polymer filling block for absorbing liquid is cleaned or replaced when fixed period maintenance is carried out, thereby effectively solving the problem that the sealing design of the traditional mechanical equipment rotating member is difficult to meet the technical requirement of no visible leakage in the inner period in the aerospace and deep sea fields.
The technical scheme that this embodiment provided is applicable to the sealing application under the deep sea operating mode, mechanical seal inner seal subassembly includes first axle sleeve 2 and cover locates the first rotating ring 3 and the first quiet ring 4 of first axle sleeve 2, the outer perisporium of first axle sleeve 2 sets up annular protruding portion 2-1, first rotating ring 3 is fixed with protruding portion 2-1 installation through first pin 9-1, first quiet ring 4 is connected with cavity gland 1's inner circumference wall circumference location to through the compression spring 6 elastic fit of axial setting, the terminal surface of the elasticity that first rotating ring 3 and first quiet ring 4 provided through compression spring 6 offsets.
On the basis of the structure, the matching structure between the first static ring 4 and the cavity gland 1 is further optimized. The inner peripheral wall of the cavity gland 1 is provided with an annular sinking groove 1-5, an annular ring seat structure 5 is arranged in the sinking groove 1-5, the ring seat structure 5 is in circumferential positioning fit with the cavity gland 1 through a second pin 9-2, two ends of a compression spring 6 are respectively propped against the end face of the ring seat structure 5 and the sinking groove 1-5, and a first stationary ring 4 is fixedly installed on the end face of one side, deviating from the compression spring 6, of the ring seat structure 5 through a third pin 9-3.
The design optimizes the structure of the mechanical inner sealing assembly and mainly comprises a first movable ring 3 and a first static ring 4 which are sleeved on a first shaft sleeve 2, wherein the first shaft sleeve 2 is connected with the first movable ring 3 and provided with annular protruding parts 2-1, the caliber of the first movable ring 3 is larger than the outer diameter of the first shaft sleeve 2 and matched with the radial size of the protruding parts, the first movable ring 3 is sleeved outside the first shaft sleeve 2, the end faces of the movable ring are jointed with the end faces of the protruding parts 2-1 and fixed by first pins 9-1, and the first pins 9-1 are axially arranged and uniformly distributed along the circumference of the first movable ring 3; the first stationary ring 4 is elastically matched with the cavity gland 1, and the particularly preferred design is that an annular sinking groove 1-5 is arranged on the inner peripheral wall of the cavity gland 1 at the position corresponding to the protruding part 2-1, the central axis of the sinking groove 1-5 coincides with the central axis of the cavity gland 1, the sinking groove 1-5 and the outer peripheral wall of the first shaft sleeve 2 form an annular inner cavity, the annular sinking groove 1-5 is matched with the shape, a ring seat structure 5 is axially arranged, the opening edge of the sinking groove 1-5 and the inner Zhou Bigou of the cavity gland 1 form a step shape, the outer peripheral wall of the ring seat structure 5 takes the shape of which one end is large in outer diameter and the other end is small in outer diameter and the middle is in step transition, the annular seat structure 5 and the opening edge shape of the sinking groove 1-5 of the cavity gland 1 form axial interference limit fit through the shape, the ring seat structure 5 is provided with the first stationary ring 4 at one end face towards the first movable ring 3, the end face of the first stationary ring 4 is fixedly arranged with the end face of the ring seat structure 5 through a third pin 9-3, the other end face of the ring seat structure 5 is provided with a compression spring 6 which is abutted against, the compression spring 6 is axially arranged, the other end of the compression spring 6 is abutted against the inner end face of the sinking groove 1-5 in the axial direction, so that the movement trend of the ring seat structure 5 and the first stationary ring 4 fixed on the ring seat structure 5 along the axial direction to one end of the first movable ring 3 can be provided through the compression spring 6, and the first stationary ring 4 is abutted against the end face of the first movable ring 3. A good mechanical sealing effect is obtained by such a structure.
In the technical scheme provided by the embodiment, one axial end of a hollow cavity body 1-4 of the cavity gland 1 is closed, the other axial end of the hollow cavity body is opened, and a gland cover plate 1-2 for closing the hollow cavity body 1-4 is detachably arranged at the opening end of the hollow cavity body. The structure of the cavity gland 1 is optimized by the design, the cavity gland 1 is of a structure with one end closed and the other end open, the gland cover plate 1-2 is arranged to be used for closing the opening in cooperation with the size and shape of the opening, the gland cover plate 1-2 is detachably mounted, and particularly, the design can be implemented in a mode of bolts 12 and the like, and the maintenance and replacement of polymer filling blocks filled in the cavity gland 1 can be conveniently carried out by the design, so that the maintenance difficulty is greatly reduced.
In the technical scheme provided by the embodiment, an annular sealing plate structure 1-3 is arranged on the outer side of a gland cover plate 1-2 of a cavity gland 1, the annular sealing plate structure 1-3 is fixedly arranged on the cavity gland 1 through screws 12, a positioning ring 7 is fixedly arranged on the outer peripheral surface of a first shaft sleeve 2, and the positioning ring 7 abuts against one side end face of the annular sealing plate structure 1-3, which is away from the gland cover plate 1-2, and is used for axially positioning the cavity gland 1. The design optimizes the matching mode between the cavity gland 1 and the first shaft sleeve 2, an annular sealing plate structure 1-3 is arranged for the gland cover plate 1-2, the installation and fixation position of the gland cover plate 1-2 can be stabilized through the design, the annular sealing plate structure is directly fixed with the cavity gland 1 through screws 12, a positioning ring 7 is sleeved at the corresponding position of the outer peripheral surface of the first shaft sleeve 2, the end face of the positioning ring 7 abuts against the annular sealing plate structure 1-3 to axially position the cavity gland 1, the installation positions of the positioning ring 7 and the screws 12 are located at different radial positions of the annular sealing plate structure 1-3, firm positioning is ensured, the positioning ring 7 is preferably installed with a shaft through a pin or screw structure, a structure with through holes on the side wall can be further adopted, the pin or the screw for fixing the positioning ring 7 directly penetrates through the through holes to be fixed with the shaft body in the first shaft sleeve 2, and the first shaft sleeve 2 can be axially positioned through the mode.
In the technical scheme provided by the embodiment, an annular blocking sealing structure 8 is arranged between two axial end parts of the cavity gland 1 and the first shaft sleeve 2, the blocking sealing structure 8 at one end of the gland cover plate 1-2 is a lip-shaped sealing piece, one sealing surface of the lip-shaped sealing piece is attached to the peripheral surface of the first shaft sleeve 2, and the other sealing surface of the lip-shaped sealing piece is attached to the joint position of the annular sealing plate structure 1-3 and the cavity gland 1. The sealing leakage-proof design of the two axial ends of the whole design optimization sealing device is characterized in that the sealing key position is at the joint position of a first shaft sleeve 2 and a cavity gland 1, a blocking sealing structure 8 at one end of the cavity gland 1 is a lip-shaped sealing element, two adjacent sealing end faces of the lip-shaped sealing element are respectively attached to the outer peripheral surface of the first shaft sleeve 2 and the inner end face of an annular sealing plate structure to achieve sealing, namely, the arrangement mode of the lip-shaped sealing element is just opposite to the conventional arrangement direction of the lip-shaped sealing element, the blocking sealing element at the closed end of the cavity gland 1 is a framework oil sealing structure, and in order to assist the installation of the oil sealing structure, a baffle ring or an annular gasket structure is preferably arranged at the side edge of the corresponding end of the cavity gland 1 degree so that the end faces are matched with the oil sealing structure.
In the technical scheme provided by the embodiment, the protruding first shaft shoulder structure 10-1 is arranged at the position, adjacent to the lip-shaped sealing piece, of the outer peripheral surface of the first shaft sleeve 2, the first shaft shoulder structure 10-1 is opposite to the axial position of the drainage structure 1-1, and leakage oil paths on the outer peripheral surface of the first shaft sleeve 2 along the axial direction are blocked through the first shaft shoulder structure 10-1, so that leakage liquid is introduced into the drainage structure 1-1. The design optimizes the inner space in the two-end blocking sealing structure 8, optimizes the structure of the surface structure of the first shaft sleeve 2 in the space, and sets a first shaft shoulder structure 10-1 which is suitable for high protrusion to block the leakage oil path on the outer peripheral surface of the first shaft sleeve 2, so that the end face leakage medium can be effectively blocked, the rotation of the shaft is utilized to drive the oil on the surface of the shaft to the outside, and then the blocked oil is introduced into the cavity of the cavity gland 1 through a small hole slotting or other forms of drainage structures 1-1 and is latched by a polymer filling block.
Referring to fig. 3 and 4, an embodiment is illustrated, in which fig. 3 is a schematic cross-sectional structure of another leak-free sealing device provided by the present invention, and fig. 4 is a schematic cross-sectional partial enlarged structure of the leak-free sealing device in fig. 3.
In the technical scheme with the same sealing design structure as the embodiment, the mechanical seal inner sealing assembly comprises a second shaft sleeve 2-2, a second movable ring 3-2, a second stationary ring 4-2 and a stationary ring seat 5-2, wherein the second shaft sleeve 2-2 and the second movable ring 3-2 are sleeved on the periphery of the shaft, one end of a cavity gland 1 is provided with a stepped annular slot, the stationary ring seat 5-2 is sleeved on the periphery of the second shaft sleeve 2-2 and inserted in the annular slot of the cavity gland 1, one side end surface of the stationary ring seat 5-2 is provided with an annular mounting groove, the periphery wall of the second stationary ring 4-2 is in interference fit with the inner peripheral wall of the mounting groove, a compression spring 6 is arranged in the annular slot of the cavity gland 1, and two ends of the compression spring 6 are respectively abutted against the cavity gland 1 and the stationary ring seat 5-2 in the axial direction for providing elasticity to prop up the end surfaces of the second stationary ring 4-2 and the second movable ring 3-2.
The design provides another optional mechanical seal inner sealing component, the design is suitable for the working environment of aerospace, the specific structure is different from the technical scheme of the embodiment, the utilized principle is consistent, and the design is specific:
The cavity gland 1 has a ring-shaped main body structure, and a closed cavity is formed between the inner wall side and the mechanical seal inner seal assembly and is drained through the drainage structure 1-1. The cavity gland 1 is adapted to the structures of the second stationary ring 4-2 and the stationary ring seat 5-2, a stepped annular slot is arranged between the inner peripheral wall and the end face of the cavity gland, and a transition structure between the inner peripheral wall and the end face is formed through the stepped structure.
The second sleeve 2-2 is sleeved outside the shaft to be optimally sealed, the second movable ring 3-2 is directly sleeved on the outer circumferential wall of the shaft, the second stationary ring 4-2 is sleeved on the outer circumferential wall of the second sleeve 2-2, the end face of one end of the second movable ring 3-2 abuts against a bearing outside the shaft, and the other end face of the second movable ring abuts against the end face of the second sleeve 2-2 and the end face of the second stationary ring 4-2 at different radial positions.
The shape of the outer peripheral wall of the static ring seat 5-2 is an annular structure with one end with large radial dimension and the other end with small radial dimension, one end with small radial dimension of the outer peripheral wall of the static ring seat 5-2 is inserted into an annular slot of the cavity gland 1, the end face of the static ring seat 5-2, which is used for butt joint of the second static ring 4-2, is provided with an annular mounting groove, and the outer peripheral wall of the second static ring 4-2 is directly in interference fit with the inner peripheral wall of the mounting groove without being fixed through a pin.
In addition, a sealing collar 14 is preferably arranged on the shaft surface matched with the outer peripheral wall of the static ring seat 5-2 to form good sealing, an annular slot is arranged on the inner edge of one side of the cavity gland 1, which is attached to the second shaft sleeve, the static ring seat 5-2 is provided with a stepped structure, one end with smaller radial dimension is inserted into the slot, the other end with larger radial dimension is provided with an annular mounting groove, a second static ring is inserted into the slot, axial limit between the static ring seat 5-2 and the cavity gland 1 is provided through a clamping ring 11, a plurality of spring slots are arranged on the annular slot of the cavity gland 1 at intervals of preset intervals towards the end surface of one end of the second static ring 4-2 so as to set a compression spring 6, and elastic force for enabling the second static ring 4-2 to be abutted against the second dynamic ring 3-2 is provided.
In the technical scheme provided by the embodiment, a flow channel groove 13 for guiding leakage is arranged between the inner peripheral surface of each of the second stationary ring and the stationary ring seat 5-2 and the second sleeve 2-2, and a convex second shoulder structure 10-2 is arranged on the outer peripheral surface of the second sleeve 2-2 at a position corresponding to the drainage structure 1-1 on the cavity gland 1 and used for blocking an oil way of the outer peripheral surface of the second sleeve 2-2. The design further optimizes the design of leakage guiding in the mechanical seal inner sealing assembly, optimizes the design of introducing leakage liquid into the inner space of the cavity gland 1, and the second stationary ring 4-2 and the stationary ring seat 5-2 are provided with a runner groove 13 at the inner edge position of the joint second sleeve for guiding oil, the runner groove 13 is provided with a convex second shoulder structure 10-2 on the track extending from the outer peripheral surface of the second sleeve 2-2 and corresponding to the position of the cavity gland 1 drainage structure 1-1 so as to block the leakage oil path on the second sleeve 2-2, thereby enabling the end face leakage medium to be effectively blocked and facilitating the oil to enter the cavity in the cavity gland 1 through the small hole of the drainage structure 1-1.
In the technical scheme provided by the embodiment, the inner side walls of the hollow cavities 1-4 of the cavity gland 1 are integrally connected with supporting ribs or supporting grid structures for enhancing the bearing capacity of the cavity gland 1. The design further optimizes the cavity internal structure of the cavity gland 1, the inner side walls of the hollow cavities 1-4 are provided with support structures for supporting rib plates or honeycomb-shaped and three-dimensional grid-shaped structures for supporting the cavity in a filling mode, the design is mainly used for enhancing the bearing strength of the hollow thin-wall cavity gland 1 and avoiding compression damage, and the structures occupy the volume of polymer filling blocks in the cavities as little as possible.
Although the present disclosure is disclosed above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (8)
1. The leakage-free sealing device is used for sealing a shaft structure and is characterized by comprising a mechanical seal inner sealing component sleeved on the periphery of the shaft, wherein a leakage absorption component is sleeved on the periphery of the mechanical seal inner sealing component, the leakage absorption component comprises a cavity gland (1) provided with a hollow cavity (1-4), the cavity gland (1) is annular, the inner peripheral wall of the cavity gland (1) is provided with a drainage structure (1-1) for communicating the hollow cavity (1-4) with an oil way of the mechanical seal inner sealing component, and a polymer filling block for absorbing liquid is arranged in the hollow cavity (1-4);
The mechanical seal inner sealing assembly comprises a first shaft sleeve (2), and a first movable ring (3) and a first static ring (4) which are sleeved on the first shaft sleeve (2), wherein an annular protruding part (2-1) is arranged on the outer peripheral wall of the first shaft sleeve (2), the first movable ring (3) is fixedly installed on the protruding part (2-1) through a first pin (9-1), the first static ring (4) is circumferentially positioned and connected with the inner peripheral wall of the cavity gland (1), and is elastically matched with the first movable ring (3) through a compression spring (6) which is axially arranged, and the end faces of elastic force provided by the compression spring (6) are propped against the first static ring (4);
Or the mechanical seal inner sealing assembly comprises a second shaft sleeve (2-2), a second movable ring (3-2), a second stationary ring (4-2) and a stationary ring seat (5-2), wherein the second shaft sleeve (2-2) and the second movable ring (3-2) are sleeved on the periphery of the shaft, one end of the cavity gland (1) is provided with a stepped annular slot, the stationary ring seat (5-2) is sleeved on the peripheral wall of the second shaft sleeve (2-2) and inserted in the annular slot of the cavity gland (1), an annular mounting groove is formed in one side end face of the stationary ring seat (5-2), the peripheral wall of the second stationary ring (4-2) is in interference fit with the inner peripheral wall of the mounting groove, a compression spring (6) is arranged in the annular slot of the cavity gland (1), and the two ends of the compression spring (6) are respectively abutted against the cavity gland (1) and the stationary ring seat (5-2) and are used for providing elasticity to prop against the second stationary ring (4-2) and the second end face (3-2).
2. The leak-free sealing device according to claim 1, wherein when the mechanical seal inner sealing assembly comprises a first shaft sleeve (2) and a first movable ring (3) and a first stationary ring (4) which are sleeved on the first shaft sleeve (2), an annular sinking groove (1-5) is formed in the inner peripheral wall of the cavity gland (1), an annular ring seat structure (5) is arranged in the sinking groove (1-5), the ring seat structure (5) is circumferentially matched with the cavity gland (1) in a positioning manner through a second pin (9-2), two ends of the compression spring (6) respectively abut against the end face of the ring seat structure (5) and the sinking groove (1-5), and the first stationary ring (4) is fixedly installed on the end face of one side, deviating from the compression spring (6), of the ring seat structure (5) through a third pin (9-3).
3. The leak-free sealing apparatus according to claim 2, wherein one end of the hollow cavity (1-4) in the axial direction is closed and the other end is opened, and the open end of the hollow cavity (1-4) is detachably provided with a gland plate (1-2) for closing the hollow cavity (1-4).
4. The leakage-free sealing device according to claim 3, wherein the cavity gland (1) is provided with an annular sealing plate structure (1-3) on the outer side of the gland cover plate (1-2), the annular sealing plate structure (1-3) is fixedly installed with the cavity gland (1) through screws (12), a positioning ring (7) is fixedly installed on the outer peripheral surface of the first shaft sleeve (2), one side end face, which is on the annular sealing plate structure (1-3) and faces away from the gland cover plate (1-2), abuts against the positioning ring (7), and the positioning ring (7) is used for axially positioning the cavity gland (1).
5. The leakage-free sealing device according to claim 4, wherein the cavity gland (1) is provided with an annular blocking sealing structure (8) between both axial ends of the cavity gland and the first shaft sleeve (2), the blocking sealing structure (8) at one end of the gland cover (1-2) is a lip-shaped sealing element, one sealing surface of the lip-shaped sealing element is attached to the peripheral surface of the first shaft sleeve (2), and the other sealing surface of the lip-shaped sealing element is attached to a gap between the cavity gland (1) and the annular sealing plate structure (1-3).
6. The leakage-free sealing device according to claim 5, wherein a raised first shoulder structure (10-1) is provided on the outer peripheral surface of the first sleeve (2) adjacent to the lip seal, the first shoulder structure (10-1) being opposite to the drainage structure (1-1), and leakage liquid is introduced into the drainage structure (1-1) by blocking an oil passage on the outer peripheral surface of the first sleeve (2) by the first shoulder structure (10-1).
7. The leak-free sealing device according to claim 1, wherein when the mechanical seal inner sealing assembly comprises a second sleeve (2-2), a second movable ring (3-2), a second stationary ring (4-2) and a stationary ring seat (5-2), a flow channel groove (13) for guiding leakage is arranged between the respective inner peripheral surfaces of the second stationary ring (4-2) and the stationary ring seat (5-2) and the second sleeve (2-2), and a convex second shoulder structure (10-2) is arranged on the outer peripheral surface of the second sleeve (2-2) at a position corresponding to the drainage structure (1-1) on the cavity gland (1) for blocking an oil path of the outer peripheral surface of the second sleeve (2-2).
8. The leakage-free sealing device according to claim 1, wherein the inner side walls of the hollow cavities (1-4) of the cavity gland (1) are integrally connected with supporting ribs or supporting grid structures for enhancing the bearing capacity of the cavity gland (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510421519.5A CN119934239A (en) | 2025-04-07 | 2025-04-07 | A leak-free sealing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510421519.5A CN119934239A (en) | 2025-04-07 | 2025-04-07 | A leak-free sealing device |
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| CN119934239A true CN119934239A (en) | 2025-05-06 |
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| CN202510421519.5A Pending CN119934239A (en) | 2025-04-07 | 2025-04-07 | A leak-free sealing device |
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| CN114320966A (en) * | 2021-12-29 | 2022-04-12 | 安徽亚兰密封件股份有限公司 | A mechanical seal structure for a fan |
| CN114542506A (en) * | 2022-03-28 | 2022-05-27 | 江苏核电有限公司 | Mechanical seal of make-up water pump |
| CN217583174U (en) * | 2022-05-26 | 2022-10-14 | 纳诺科技有限公司 | Double-end-face leakage-proof mechanical seal assembly |
| CN221683604U (en) * | 2024-01-31 | 2024-09-10 | 浙江为真密封科技有限公司 | Sanitary-grade double-end-face mechanical sealing structure |
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|---|---|---|---|---|
| US5074568A (en) * | 1989-04-25 | 1991-12-24 | Erich Bertsch | Shaft seal |
| US20130022460A1 (en) * | 2010-04-20 | 2013-01-24 | Flowserve Management Company | Mechanical Seal for Large Pumps |
| CN204153155U (en) * | 2014-09-03 | 2015-02-11 | 上海乐合流体机械有限公司 | Mechanical seal leak-tight seal assembly |
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| CN114542506A (en) * | 2022-03-28 | 2022-05-27 | 江苏核电有限公司 | Mechanical seal of make-up water pump |
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| CN221683604U (en) * | 2024-01-31 | 2024-09-10 | 浙江为真密封科技有限公司 | Sanitary-grade double-end-face mechanical sealing structure |
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