CN118224308B - Moving ring and double-cavity mechanical seal - Google Patents
Moving ring and double-cavity mechanical sealInfo
- Publication number
- CN118224308B CN118224308B CN202410446081.1A CN202410446081A CN118224308B CN 118224308 B CN118224308 B CN 118224308B CN 202410446081 A CN202410446081 A CN 202410446081A CN 118224308 B CN118224308 B CN 118224308B
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- Prior art keywords
- movable ring
- cavity
- seal
- ring body
- long
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring
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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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Sealing (AREA)
Abstract
本发明公开了一种动环，包括动环本体，动环本体的一侧设有安装部，另一侧为带有齿轮环状摩擦面的齿轮环形槽，齿轮环形槽的环状内壁面为粗糙壁面，齿轮环形摩擦面下方设有长短式叶片散热片，散热片截面均为梯形，根据弧度大小沿轴向由小到大依次叠加，符合肋片设计原理。还公开了一种双腔机械密封，所述双腔机械密封为双腔双端面密封结构，具有双密封腔室及动环冲洗密封隔离腔，极大的提高了密封性能及冲洗效率，压缩弹簧与补偿弹簧相互作用，使该密封结构能承受一定的轴向及径向跳动，其结构简单、便于拆卸维护、寿命长久。
This invention discloses a rotating ring, including a rotating ring body. One side of the rotating ring body has a mounting portion, and the other side has a gear annular groove with a gear-shaped friction surface. The annular inner wall of the gear annular groove has a rough surface. Below the gear annular friction surface are long and short blade heat sinks, all with trapezoidal cross-sections, stacked sequentially from small to large along the axial direction according to the curvature, conforming to the rib design principle. A dual-chamber mechanical seal is also disclosed. The dual-chamber mechanical seal is a dual-chamber, dual-end-face sealing structure with dual sealing chambers and a rotating ring flushing and sealing isolation chamber, greatly improving sealing performance and flushing efficiency. The interaction between the compression spring and the compensation spring allows the sealing structure to withstand a certain amount of axial and radial runout. Its structure is simple, easy to disassemble and maintain, and has a long service life.
Description
Technical Field
The invention relates to the technical field of mechanical sealing, in particular to a movable ring and a double-cavity mechanical seal.
Background
The mechanical seal is a device for rotating the shaft seal of the fluid machinery, mainly comprises a compensation spring, a movable ring, a stationary ring seat and the like, wherein the movable ring and the stationary ring are mutually matched to form a dynamic friction pair, and how to effectively cool a dynamic friction surface is a necessary condition for ensuring the normal operation of the mechanical seal, so that the prior art cannot solve the problem.
The mechanical seal can be divided into single-end face seal and multi-end face seal according to the pair of seal faces, the single-end face seal is composed of a pair of seal faces, an external liquid sealing system is not needed, a self-flushing system is needed, the manufacturing, the dismounting and the mounting are convenient, the structure is simple, the multi-end face seal is provided with two or more pairs of seal faces, sealing liquid is needed to be introduced for sealing, lubrication, flushing and cooling, compared with the single-end face mechanical seal, the multi-end face seal has the greatest advantages that one more seal face is added, the leakage quantity is reduced, the stress of the seal face is more reasonable, the manufacturing difficulty is high, the structure is complex, the volume is large, and once the seal leakage phenomenon occurs, the investigation difficulty is extremely high.
Disclosure of Invention
The invention provides a movable ring and a double-cavity mechanical seal, which can wash and cool a movable friction pair of a movable ring and an isolation cavity in rotation, can improve washing efficiency and perform better sealing, and has the advantages of simple structure, convenient disassembly and maintenance and long service life.
The technical scheme adopted for achieving the purposes of the invention is as follows:
The utility model provides a rotating ring, one side of rotating ring body is equipped with the installation department, and the installation department is equipped with flat keyway and compression spring chamber, and compression spring intracavity can set up compression spring, and flat key and compression spring are used for forming fixed connection with the rotating ring seat, the opposite side of rotating ring body is the annular friction surface of gear, and the annular friction surface of gear has two sets of gear ring grooves, and the annular inner wall of gear ring groove is rough wall, and the annular friction surface of gear ring below is equipped with the radial evenly distributed's of following the rotating ring body long and short type blade fin, and long and short type blade fin adopts rib design principle design and stack.
The flat key grooves and the compression spring cavities are four groups, the flat key grooves and the compression spring cavities are uniformly distributed along the radial direction of the movable ring body, the gear annular grooves are two groups, and the axial lead of the gear annular grooves is coincident with the axial lead of the movable ring.
Further, the ratio of the depth of the annular groove of the gear to the width of the movable ring is 1:3. The ratio of the inner diameter of the annular groove of the gear to the diameter of the movable ring body is 5:6. The ratio of the outer diameter of the annular groove of the gear to the diameter of the movable ring body is 9:10. The ratio of the depth of the gear annular groove to the width of the movable ring body is 2:5.
A long and short type blade cooling fin is arranged below the gear annular friction surface of the movable ring body, and the long and short type blade cooling fin is designed according to the rib principle.
Further, the ratio of the blade heel width of the long and short type blade cooling fins to the width of the movable ring body is 1:70, the ratio of the blade tip width of the long and short type blade cooling fins to the blade root width is 1:4, the thickness of the long and short type blade cooling fins uniformly changes along the bending direction of the blade, the long and short type blade cooling fins are sequentially overlapped along the axial direction of the movable ring body in the sequence of radian from large to small to form long and short type blade cooling fin groups, the ratio of the overlapping spacing of the long and short type blade cooling fin groups to the width of the movable ring is 1:34, eight long and short type blade cooling fin groups are provided, each long and short type blade cooling fin group comprises nine long and short type blades, the long and short type blade cooling fin groups formed after the long and short type blade cooling fin groups are uniformly distributed along the radial direction of the movable ring body, the angle beta=50 DEG of each overlapping blade is formed by overlapping the angle alpha=45 DEG between each long and short type blade cooling fin groups.
Further, the ratio of the radius of the long and short type blade cooling fin to the width of the movable ring is 2:3-1:1, the radian of the long and short type blade cooling fin is 2.5-16rad, the angle of the long and short type blade cooling fin is 15-69 degrees, and the ratio of the installation diameter of the long and short type blade cooling fin to the diameter of the movable ring is 4:5.
A double-cavity mechanical seal comprises the movable ring, an impeller gland, a seal shell, a seal gland, a shaft sleeve, a transmission shaft, a stationary ring and a movable ring assembly. The transmission shaft is arranged between the impeller gland and the sealing gland and extends out of the sealing gland, the double-cavity mechanical seal space is bilaterally symmetrical, an isolation cavity is formed among the static ring, the movable ring and the shaft sleeve, and two sealing cavities are formed among the static ring, the shaft sleeve, the movable ring component, the sealing gland and the sealing shell.
The double-cavity mechanical seal comprises a double-cavity mechanical seal body, a sealing gland, a rotating ring assembly, a rotating ring gear annular friction surface, a rotating shaft sleeve, a rotating sealing friction pair, a rotating ring assembly and a driving shaft, wherein the end, far away from the sealing gland, of the double-cavity mechanical seal body is provided with the rotating ring and the rotating ring assembly, the rotating ring side of the rotating ring is close to the sealing gland, the annular friction surface of the rotating ring gear is in direct contact with the static friction surface of the rotating ring to form a movable sealing friction pair capable of rotating relatively, the rotating ring assembly is fixedly connected with the shaft sleeve relatively through a second fixing bolt, and the rotating ring assembly is fixedly connected with the shaft sleeve relatively through the fixing bolt.
The movable ring body, the flat key, the compression spring, the movable ring gasket, the compensation spring and the compensation spring gasket are sequentially arranged along the transmission shaft from left to right. The annular friction surface of gear is kept away from to the moving ring subassembly, is close to sealing gland's one end and has formed secondary seal chamber on the axle sleeve through the bolt fastening, with quiet ring, axle sleeve and casing between, the one end of moving ring subassembly has the slip mounting groove that is used for installing moving ring, compensation spring, flush key, moving ring gasket and compensation spring gasket, is equipped with the flush key groove on the slip mounting groove, moving ring body and moving ring seat form relative static fixed connection through the flush key, and the flush key below is equipped with compression spring chamber.
Further, a flat key angle gamma is formed in the upper left corner of the flat key, and the flat key angle gamma=5-15 degrees,
Further, three groups of compression springs are uniformly arranged in the compression spring cavity, mounting threaded holes are formed in the contact part of the upper side of the flat key and the movable ring seat, four groups of mounting threaded holes are formed in total, and the four groups of compression springs are uniformly distributed along the radial direction of the movable ring body.
The compression spring is used for providing radial force for the flat key, so that the flat key always keeps accurate fit with the inner wall surface of the movable ring seat, leakage mediums are prevented from entering the compensation spring cavity through the installation threaded hole, the compensation spring is ensured to be in a relative sealing state, the compression spring is used for providing axial compensation for the dynamic sealing friction surface, and simultaneously providing axial force for the dynamic sealing friction surface, the movable ring body and the movable ring seat are ensured to always keep relative static state in the rotating process along with the transmission shaft, and meanwhile, the annular friction surface of the gear of the movable ring body and the static friction surface of the static ring can be ensured to always keep abutting connection in the relative rotating process. The dynamic seal friction surface comprises the annular gear friction surface and the static friction surface. The interaction of the compression spring and the compensation spring can also enable the double-cavity mechanical seal to adapt to certain axial runout and radial runout.
The static ring is directly fixedly connected with the sealing shell through the fixing bolts, the sealing cavity is divided into a left cavity and a right cavity, the left sealing cavity is a first sealing cavity, the right sealing cavity is a second sealing cavity, the left sealing cavity is a main sealing cavity, the right sealing cavity is a secondary sealing cavity, leakage media are arranged in the left sealing cavity, and the right sealing cavity can serve as auxiliary sealing when forming second sealing protection to prevent external impurities from entering the main sealing cavity.
The static ring, the movable ring and the shaft sleeve form an isolation cavity, flushing holes communicated with the isolation cavity are formed in the static ring and the sealing shell, and the dynamic sealing friction surface and the long and short type blade cooling fins can be flushed directly through the flushing holes, so that flushing efficiency is greatly improved.
By the technical scheme, the invention has the following beneficial effects:
1. The movable ring provided by the invention has the gear annular friction surface, so that the area of the dynamic seal friction surface is reduced, the gear annular groove wall surface is a rough wall surface, the heat exchange area is increased, and a better cooling effect can be achieved;
2. the movable ring provided by the invention is provided with the long and short type blade radiating fins which are axially overlapped and uniformly distributed along the radial direction, and the cross section of the blade is designed into a trapezoid structure, so that the movable ring has a good heat conduction effect and can rapidly take away heat generated by the movable friction pair;
3. according to the invention, the movable ring is fixedly connected with the movable ring seat through the flat key, the compression spring is arranged below the flat key and is matched with the compensation spring, the compensation spring can axially and radially compensate the friction surface while fixing the movable ring, so that a good sealing effect is achieved, particles can be prevented from entering a compensation spring sealing cavity to cause accumulation, the interaction of the compression spring and the compensation spring can also enable the device to adapt to certain radial and axial runout, the sealing surface is always kept to be attached, and the mechanical sealing is prevented from being invalid;
4. the double-cavity double-end-face sealing structure provided by the invention is bilaterally symmetrical, simple and portable in structure, convenient to maintain and capable of achieving a good sealing effect;
5. In the invention, a sealed isolation cavity is formed among the movable ring, the static ring and the shaft sleeve, and the static ring and the sealed shell are provided with flushing holes communicated with the isolation cavity, so that auxiliary flushing can be directly carried out on the movable sealing friction surface and the long and short type blade cooling fins, and a better cooling effect is achieved.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a moving ring structure provided by the present invention;
FIG. 2 is a semi-sectional view of a moving ring provided by the present invention;
FIG. 3 is an enlarged schematic view of the structure shown in FIG. 2A;
FIG. 4 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 5 is an enlarged schematic view of the structure at C in FIG. 2;
FIG. 6 is a semi-sectional view of a dual chamber mechanical seal provided by the present invention;
fig. 7 is an enlarged schematic view of the structure at D in fig. 6.
The reference numerals of the drawings comprise 1, a movable ring body, 2, a mounting part, 3, a gear annular friction surface, 4, a gear annular groove, 5, an annular inner wall surface, 6, a long and short type blade radiating fin, 7, a shaft axis, 8, a static friction surface, 9, an anti-rotation pin, 10, a static ring, 11, an isolation cavity, 12, a shaft sleeve, 13, a movable ring gasket, 14, a compensation spring, 15, a first fixing bolt, 16, a movable ring seat, 17, a second fixing bolt, 18, a flat key groove, 19, a compression spring, 20, a compression spring cavity, 21, a sliding mounting groove, 22, a compensation spring gasket, 23, a sealing gland, 24, a third fixing bolt, 25, a sealing shell, 26, a fourth fixing bolt, 27, a flushing fluid inlet, 28, a fifth fixing bolt, 29, an impeller gland, 30, a transmission shaft, 31, a flushing fluid outlet, 32, a left sealing cavity and a right sealing cavity.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the embodiment, as shown in connection with fig. 1-7, in the first embodiment, a mounting part 2 is arranged on one side of a moving ring body 1, a flat key groove 18 and a compression spring cavity 20 are arranged on the mounting part 2, a gear annular friction surface 3 is arranged on the other side of the moving ring body 1, two groups of gear annular grooves 4 are formed in the gear annular friction surface 3, an annular inner wall surface 5 of the gear annular groove 4 is a rough wall surface, and long and short type blade cooling fins 6 which are designed and overlapped by adopting a rib design principle and are uniformly distributed along the radial direction of the moving ring are arranged below the gear annular friction surface 3.
As shown in fig. 7, the mounting portion 2 of the moving ring body 1 is provided with a flat key groove 18 and a compression spring cavity 20, and optionally, the flat key groove 18 and the compression spring cavity 20 are distributed uniformly along the radial direction of the moving ring body 1 in four groups.
As shown in fig. 3, the annular inner wall surface 5 of the gear annular groove 4 is a rough wall surface, and the gear annular groove 4 is formed on the gear annular friction surface 3, so that the area of the gear annular friction surface 3 can be reduced, and the heat dissipation area can be increased due to the fact that the annular inner wall surface 5 is a rough wall surface, and the effect of enhancing heat conduction can be achieved. Two groups of gear annular grooves 4 are formed in the gear annular friction surface 3, and the axial lead 7 of the two groups of gear annular grooves 4 is coincident with the axial lead of the movable ring.
Optionally, the ratio of the depth of the gear annular groove 4 to the width of the moving ring body 1 is 1:3. The ratio of the inner diameter of the gear annular groove 4 to the diameter of the movable ring body is 5:6. The ratio of the outer diameter of the gear annular groove 4 to the diameter of the movable ring body is 9:10. The ratio of the width to the depth of the gear annular groove 4 is 2:5.
As shown in fig. 4, long and short type blade cooling fins 6 uniformly distributed along the radial direction of the movable ring body 1 are arranged below the gear annular friction surface 3, and the long and short type blade cooling fins 6 are designed according to the rib principle and the impeller design principle.
Optionally, the ratio of the radius of the long and short blade cooling fins 6 to the width of the movable ring is 2:3-1:1. The radian of the long and short blade cooling fins 6 is 2.5-16rad. The angle of the long and short blade cooling fins 6 is 15-69 degrees. The ratio of the mounting diameter of the long and short blade fins 6 to the diameter of the moving ring is 4:5.
The ratio of the width of the leaf heel of the long and short type blade cooling fin 6 to the width of the movable ring body 1 is 1:70, the ratio of the leaf tip width to the leaf root width is 1:4, the thickness of the long and short type blade cooling fin 6 in the bending direction of the blade is uniformly changed, the long and short type blade cooling fin 6 is sequentially overlapped in the axial direction of the movable ring body 1 from big to small in radian order to form long and short type blade cooling fin groups, the ratio of the overlapping interval of the long and short type blade cooling fin 6 to the width of the movable ring is 1:34, eight groups of long and short type blade cooling fin groups are total, nine long and short type blade cooling fin groups formed after the overlapping of the long and short type blade cooling fin groups are uniformly distributed in the radial direction of the movable ring body, the angle beta=50 DEG of each group of overlapped blades, and the angle alpha=45 DEG between each group of overlapped blades. The long and short type blade cooling fins 6 rotate along with the transmission shaft 30 while enhancing the heat conducting performance, so that the heat exchange efficiency between the annular friction surface 3 of the rotating ring gear and the flushing fluid can be increased, the cross section of the long and short type blade cooling fins 6 is trapezoidal, the cooling fins are driven by the friction pair to start, and are arranged from large to small along the axial direction according to the radian, so that the heat exchange efficiency conforms to the rib design principle, and the convection heat exchange capacity can be increased.
The second embodiment discloses a double-cavity mechanical seal, as shown in fig. 6, the mechanical seal is installed between a transmission shaft 30 and a sealing gland 23 and is arranged on a shaft sleeve 12, the transmission shaft 30 is installed between an impeller gland 29 and the sealing gland 23 and extends out of the sealing gland 23, and the double-cavity mechanical seal comprises a movable ring body 1, a movable ring assembly and a stationary ring 10. An isolation cavity 11 is formed among the stationary ring 10, the movable ring body 1 and the shaft sleeve 12, and two sealing cavities are formed among the stationary ring 10, the shaft sleeve 12, the movable ring body 1, the movable ring assembly, the sealing gland 23 and the sealing shell 25.
The end of the sealing gland 23 far away from the double-cavity mechanical seal is provided with a stationary ring 10, one side of the stationary ring 10 close to the sealing gland 23 is provided with a movable ring and a movable ring assembly, and the movable ring assembly is sequentially provided with a movable ring body 1, a flat key 18, a compression spring 19, a movable ring gasket 13, a compensation spring 14 and a compensation spring gasket 22 from left to right along a transmission shaft. The moving ring assembly is fixedly connected with the shaft sleeve 12 in a relatively static manner through the second fixing bolt 17, and the moving ring assembly is fixedly connected with the shaft sleeve 12 through the first fixing bolt 15 and the transmission shaft 30.
One end of the moving ring assembly is provided with a sliding mounting groove 21 for mounting the moving ring body 1 and the compensating spring 14, the mounting part 2 and the sliding mounting groove 21 are provided with flat key grooves 18, and the moving ring body 1 and the moving ring seat 16 form relatively static fixed connection through the flat keys 18.
Optionally, the upper left corner of the flat key 18 is provided with a flat key angle γ, said flat key angle γ=5-15°
The compression spring cavity 20 is arranged below the flat key 18, three groups of compression springs 19 are uniformly arranged in the compression spring cavity 20, mounting threaded holes are formed in the contact part of the upper side of the flat key 18 and the movable ring seat 16, four groups of mounting threaded holes are uniformly distributed in the radial direction, three groups of compression springs are uniformly arranged in the compression spring cavity and used for providing radial force for the flat key 18, so that the flat key 18 always keeps precisely attached to the inner wall surface of the movable ring seat 16, leakage mediums are prevented from entering the compensation spring cavity 20 through the mounting threaded holes, the mediums and particles can be prevented from entering, accumulation is caused, the compensation springs 14 are ensured to be in a relatively sealed state, the compression springs 19 are used for providing axial compensation for a movable seal friction surface, and simultaneously providing an axial force for the movable seal friction surface, so that the movable ring body 1 and the movable ring seat 16 always keep a relatively static state in the process of rotating along with the transmission shaft 30, and simultaneously, the gear annular friction surface 3 of the movable ring body 1 and the static friction surface 8 of the movable ring 10 can always keep abutting in the process of rotating relatively, wherein the movable seal friction surface comprises the gear annular friction surface 3 and the static friction surface 8. The interaction of the compression spring 19 with the compensation spring 14 also enables the seal to accommodate certain axial runout and radial runout.
The stationary ring 10 is directly fixedly connected with the seal housing 25 through the fourth fixing bolt 26, the seal cavity is divided into a left cavity 32 and a right cavity 33, the left seal 32 is a first seal cavity, the right seal cavity 33 is a second seal cavity, the left seal cavity 32 is a main seal cavity, the right seal cavity 33 is a secondary seal cavity, leakage media are arranged in the left seal cavity 32, and the right seal cavity 33 can serve as an auxiliary seal to prevent external impurities from entering the main seal cavity while forming a second seal protection. The gear annular friction surface 3 of the movable ring body 1 is connected with the static friction surface 8 of the static ring 10 in an abutting mode to form a movable friction pair capable of rotating relatively, an isolation cavity 11 is formed among the movable ring body 1, the static ring 10 and the shaft sleeve 12, flushing holes 27 communicated with the isolation cavity 11 are formed in the static ring 10 and the sealing shell 25, and the mechanical seal can flush the movable seal friction surface 3 and the long and short type blade cooling fins 6 directly through the flushing holes, so that flushing efficiency is greatly improved.
The sealing device is symmetrical in space left and right, is provided with fourteen groups of sealing rubber rings, is distributed at key positions such as the movable ring body 1, the stationary ring 10, the shaft sleeve 12 and the like, can effectively prevent medium leakage, and is simple and compact in structure and convenient to detach and maintain.
The working process of the invention is as follows:
The motor connected with the transmission shaft 30 is started, the transmission shaft 30 drives the shaft sleeve 12, the movable ring body 1 and the movable ring assembly which are fixedly connected with the transmission shaft 30 to start rotating, and the static ring anti-rotation pin 9 is arranged on the transmission shaft 30, so that the static ring 10 can be further prevented from sliding relatively. The stationary ring 10 is directly fixedly connected with the seal housing 25 through the fourth fixing bolt 26, the seal cavity is divided into a left cavity 32 and a right cavity 33, the left seal 32 is a first seal cavity, the right seal cavity 33 is a second seal cavity, the left seal cavity 32 is a main seal cavity in the working process, the right seal cavity 33 is a secondary seal cavity, the left seal cavity 32 is a leakage medium seal cavity, when the left seal cavity 32 fails, the right seal cavity 33 forms a secondary seal cavity on the basis of auxiliary seal, a second seal guarantee is formed, and when internal medium leakage is prevented, external air and other impurities can be ensured to enter the main seal cavity.
The movable ring body 1 rotates along with the transmission shaft 30, the gear annular friction surface 3 of the movable ring body 1 is in abutting connection with the static friction surface 8 of the static ring 10, a relatively rotating dynamic friction pair is formed, lubricating oil is filled in the gear annular groove 4, and the lubricating oil is used for ensuring that an oil film on the dynamic seal friction surface is always complete when the movable ring body 1 and the static ring 10 relatively rotate, so that the service life of the sealing device is prolonged.
The isolation cavity 11 is formed among the movable ring body 1, the stationary ring 10 and the shaft sleeve 12, when the movable ring rotates relatively, heat generated by the relative rotation of the movable ring and the stationary ring can be directly led into the movable ring isolation cavity 11 through the long and short type blade cooling fins below the gear annular friction surface 3 of the movable ring body 1, the stationary ring 10 and the sealing shell 25 are provided with the 27 communicated with the isolation cavity 11, flushing fluid enters the movable ring isolation cavity 11 through the flushing holes 27 during operation, directly flushes the movable sealing friction surface 3 and the long and short type blade cooling fins 6, and after flowing out through the flushing fluid outlet 31, enters the external heat exchange device to cool, enters the isolation cavity 11 from the flushing fluid inlet 27 for heat exchange, and circulates reciprocally, so that the flushing efficiency is greatly improved.
In the running process, the compression spring 19 always provides a radial thrust for the flat key 18, the upper surface of the flat key is always kept precisely attached to the movable ring seat 16, the compensation spring 14 always provides an axial thrust for the movable ring body 1 and the flat key 18, the end face of the movable ring mounting part 2 and the right end face of the flat key 18 are always kept attached to the movable ring gasket 13, the compensation spring cavity 20 always maintains a self-sealing state, when the dynamic seal friction surface is worn, the axial thrust provided by the compensation spring 14 can push the flat key 18 to axially move along the oblique angle of the flat key, the compression spring 19 is further compressed to push the movable ring body 1 to axially compensate, when axial runout or radial runout occurs, the compensation spring 14 and the compression spring 19 can also rapidly react, the compensation spring 14 provides axial compensation, the radial thrust provided by the compression spring 19 is gradually increased along with the gradual increase of the abrasion quantity of the dynamic seal friction surface, and the sealing failure caused by medium leakage due to abrasion of the sealing surface can be effectively prevented.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
While the principles and embodiments of the present invention have been described in detail in the foregoing application of the principles and embodiments of the present invention, the above examples are provided for the purpose of aiding in the understanding of the principles and concepts of the present invention and may be varied in many ways by those of ordinary skill in the art in light of the teachings of the present invention, and the above descriptions should not be construed as limiting the invention.
Claims (6)
1. A movable ring is characterized by comprising a movable ring body (1), wherein one side of the movable ring body (1) is provided with a mounting part (2), the other side of the movable ring body is provided with a gear annular friction surface (3), the gear annular friction surface (3) is at least provided with two groups of gear annular grooves (4), an annular inner wall surface (5) of each gear annular groove (4) is a rough wall surface, the mounting part (2) is provided with a flat key (18), a compression spring cavity (20) and mounting grooves of the flat key (18), a plurality of the flat keys (18), the compression spring cavities (20) and the mounting grooves of the flat key (18) are uniformly distributed along the radial direction of the movable ring body (1), the ratio of the depth of each gear annular groove (4) to the width of the movable ring body (1) is 1:3, the axial lines of each gear annular groove (4) are overlapped with the axial lines (7) of the movable ring, the ratio of the diameters of the inner diameters of the gear annular grooves (4) to the diameters of the movable ring body (1) is 5:6, the ratio of the diameters of the outer diameters of the annular grooves to the diameters of the annular grooves (1) to the axial diameters of the annular grooves (1:9), the long and short type blade cooling fins (6) are designed and overlapped by adopting a fin design principle, the ratio of the blade root width of the long and short type blade cooling fins (6) to the width of the movable ring body (1) is 1:70, the ratio of the blade tip width to the blade root width is 1:4, the thickness of the long and short type blade cooling fins (6) in the bending direction of the blades is uniformly changed, the long and short type blade cooling fins (6) are sequentially overlapped along the axial direction of the movable ring body (1) according to the sequence from large radian to small radian, the ratio of the overlapped space of the long and short type blade cooling fins to the width of the movable ring body (1) is 1:34, eight groups of long and short type blade cooling fins are arranged, each group comprises nine long and short blades, the long and short type blade cooling fins (6) are uniformly distributed in the radial direction of the movable ring body (1), the angle beta=50 DEG of each group of overlapped blades is equal to 45 DEG, the radius of the long and short type blade cooling fins (6) and the diameter of the movable ring body (1:1) are equal to 1:6, the radial ratio of the long and short type cooling fins (1:1) is equal to 16.6, and the diameter of the radial ratio of the two long and the radial direction of the movable ring body (1:1 is equal to 1.1:1.
2. The double-cavity mechanical seal is of a double-cavity double-end-face sealing structure and is characterized by comprising a movable ring body (1), an impeller rear cover plate (29), a sealing shell (25), a sealing gland (23), a shaft sleeve (12), a transmission shaft (30), a static ring (10) and a movable ring assembly, wherein the static ring (10) is arranged at one end, far away from the sealing gland (23), of the double-cavity mechanical seal, one side, close to the sealing gland (23), of the movable ring (10) is provided with the movable ring body (1) and the movable ring assembly, a gear annular friction surface (3) of the movable ring body (1) is in direct contact with a static friction surface (8) of the movable ring (10) to form a movable sealing friction pair capable of rotating relatively, the movable ring assembly is fixedly connected with the shaft sleeve (12) through a second fixing bolt (17), and the movable ring assembly is fixedly connected with the shaft sleeve (12) through a first fixing bolt (15) and the transmission shaft (30).
3. The double-cavity mechanical seal according to claim 2, wherein the movable ring assembly comprises a flat key (18), a movable ring gasket (13), a compensation spring (14), a movable ring seat (16) and a compensation spring gasket (22), one end of the movable ring assembly, which is far away from the annular friction surface (3) of the gear, is fixedly connected with the shaft sleeve (12) through a fixing bolt (17), and one end of the movable ring assembly, which is close to the stationary ring (10), is provided with a sliding mounting groove (21) for mounting the movable ring body (1), the compensation spring (14), the flat key (18), the movable ring gasket (13) and the compensation spring gasket (22).
4. A double-cavity mechanical seal according to claim 3, characterized in that the flat key (18) is provided with a flat key angle γ, the flat key angle γ is 5 ° -15 °, the movable ring assembly is sequentially arranged along the transmission shaft (30), the movable ring body (1) and the movable ring seat (16) form fixed connection through the flat key (18), the inner side of the flat key (18) is provided with a compression spring cavity (20), the contact part of the flat key (18) and the movable ring seat (16) is provided with mounting threaded holes, the mounting threaded holes are provided with four groups, the four groups are uniformly distributed along the radial direction of the movable ring body (1), compression springs (19) are uniformly arranged in the compression spring cavity (20) and are used for providing a radial force for the flat key (18) to be always attached to the inner wall surface of the movable ring seat (16), the compression springs (19) are used for providing axial compensation for dynamic seal friction pairs, and simultaneously providing an axial force for dynamic seal friction pairs, so that the movable ring (1) and the movable ring seat (16) are always kept in a static friction state with respect to the transmission shaft (8), and the static friction surface (3) are always kept in a static friction state in a relative process.
5. The double-cavity mechanical seal according to claim 2, wherein the stationary ring (10) is fixedly connected with the seal housing (25) through a fourth fixing bolt (26), the seal cavity is divided into a left seal cavity (32) and a right seal cavity (33), the left seal cavity (32) is a first seal cavity, the right seal cavity (33) forms a second seal cavity, a leakage medium is arranged in the left seal cavity (32), and the right seal cavity (33) can serve as an auxiliary seal to prevent external impurities from entering the left seal cavity (32) while forming a second seal protection.
6. The double-cavity mechanical seal according to claim 2, wherein an isolation cavity (11) is formed between the stationary ring (10), the movable ring body (1) and the shaft sleeve (12), flushing holes (27) communicated with the isolation cavity (11) are formed in the stationary ring (10) and the seal shell (25), and the movable seal friction pair and the long and short type blade cooling fin (6) can be flushed directly through the flushing holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410446081.1A CN118224308B (en) | 2024-04-15 | 2024-04-15 | Moving ring and double-cavity mechanical seal |
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| CN202410446081.1A CN118224308B (en) | 2024-04-15 | 2024-04-15 | Moving ring and double-cavity mechanical seal |
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| CN118224308B true CN118224308B (en) | 2025-11-21 |
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| CN103574039A (en) * | 2012-07-18 | 2014-02-12 | 苏州立德泵技术研究院有限公司 | Embedded double-sealing device without sealing cover |
| CN105317753A (en) * | 2015-10-19 | 2016-02-10 | 季裕成 | Mechanical seal temperature equalizing device of fluoroplastic pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1334478A (en) * | 1972-05-10 | 1973-10-17 | Filton Ltd | Centrifugal pumps |
| CN108005947B (en) * | 2017-12-12 | 2024-07-02 | 浙江胜发泵业有限公司 | Assembled radial double-end-face mechanical seal for rotary jet pump |
| CN210770244U (en) * | 2019-10-11 | 2020-06-16 | 江苏优耐机械制造有限公司 | Machine seal flushing structure using high-temperature high-pressure static ring belt for cooling |
| CN216199031U (en) * | 2021-11-11 | 2022-04-05 | 辽宁和泉石油装备制造有限公司 | Mechanical seal structure for integrated double-end-face centrifugal slurry pump |
| CN114440684B (en) * | 2022-01-13 | 2024-01-12 | 江苏海鼎电气科技有限公司 | Electronic heat dissipation device with adjustable induced air interval |
| CN217152986U (en) * | 2022-04-18 | 2022-08-09 | 宁波天工机械密封有限公司 | Rotating ring and mechanical seal with same |
| CN114838132B (en) * | 2022-05-25 | 2025-03-14 | 江苏大学 | A non-contact mechanical seal suitable for high temperature media |
| CN219774348U (en) * | 2023-04-11 | 2023-09-29 | 洛普兰机械设备(宁波)有限公司 | Double-end-face mechanical seal for double-screw compressor |
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2024
- 2024-04-15 CN CN202410446081.1A patent/CN118224308B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574039A (en) * | 2012-07-18 | 2014-02-12 | 苏州立德泵技术研究院有限公司 | Embedded double-sealing device without sealing cover |
| CN105317753A (en) * | 2015-10-19 | 2016-02-10 | 季裕成 | Mechanical seal temperature equalizing device of fluoroplastic pump |
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| CN118224308A (en) | 2024-06-21 |
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