CN111677872B

CN111677872B - Double-channel radial distributed expandable mechanical sealing device

Info

Publication number: CN111677872B
Application number: CN202010553135.6A
Authority: CN
Inventors: 张幼安; 胡长明; 魏忠良; 刘进; 张正兵
Original assignee: CETC 14 Research Institute
Current assignee: CETC 14 Research Institute
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-02-12
Anticipated expiration: 2040-06-17
Also published as: CN111677872A

Abstract

The invention discloses a double-channel radial distributed expandable mechanical sealing device, which relates to the technical field of mechanical dynamic sealing and comprises a shell, an inner ring, a ceramic sealing ring and a flexible dynamic sealing mechanism, wherein under the condition that the size of an external structure is not changed, a pair of liquid inlet and return expansion ports are arranged on the device and are distributed at an angle of 180 degrees with the original liquid inlet and return ports, so that the flow resistance is reduced, the through-flow capacity of the device is expanded, the through-flow capacity is obviously increased, and the relative position of the liquid inlet and return ports can be periodically changed due to the fact that the device can rotate when working normally, so that the fluctuation of the liquid flow in the rotating process is reduced; meanwhile, a flexible dynamic sealing structure is arranged in the device, so that the reliability and the service life of the flexible dynamic sealing are improved, a proper composite flexible sealing form and a proper mounting structure are selected, meanwhile, the surface of a metal piece matched with the flexible dynamic sealing structure is sprayed with a ceramic material to improve the hardness and the wear resistance of the metal piece, and a set of double-channel radial distributed expandable mechanical sealing device capable of adapting to severe environments such as vibration, impact, wide temperature range and the like is provided.

Description

Double-channel radial distributed expandable mechanical sealing device

Technical Field

The invention relates to the technical field of mechanical dynamic sealing, in particular to a double-channel radial distributed expandable mechanical sealing device.

Background

The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to the rotation axis, keeping fit and relatively sliding under the action of fluid pressure and a compensation mechanism (or magnetic force) and the cooperation of an auxiliary seal. The mechanical dynamic seal using the ceramic material sealing ring has the advantages of good sealing performance, long service life and strong corrosion resistance, and is widely and mature applied in industries such as nuclear power, petrochemical industry and ships. Under the environmental conditions of temperature impact, wide temperature range and mechanical vibration impact, the ceramic seal is easy to be stressed and damaged. The product design is developing towards high integration, miniaturization and flattening.

The prior mechanical sealing devices for cooling are all in an up-down layout, the radial dimension of the layout is small, but the axial dimension is large, and the structural layout is not suitable for equipment with tense axial dimension. For this reason, change the structural configuration, change the mechanical seal ring of arranging from top to bottom for the first time and arrange radially. Under the condition of ensuring the same flow area, the axial size of the whole mechanical sealing device is greatly reduced, and double-channel fluid rotary transmission under the condition of lack of axial installation space is realized; in order to improve the flow capacity of the mechanical sealing device as much as possible on the premise of the same structure size, the flow capacity is innovatively increased by reserving the expansion interface, and the flow capacity is improved by more than 70% after simulation analysis and test data comparison.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a double-channel radial distributed expandable mechanical sealing device capable of adapting to vibration, impact and wide temperature range change, and solves the equipment installation problem and the environmental adaptability problem with strict limitation on height and size.

In order to achieve the purpose, the invention provides the following technical scheme: the flexible dynamic sealing device comprises a shell, an inner ring, a ceramic sealing ring and a flexible dynamic sealing mechanism, wherein the inner ring is rotatably arranged in the shell, and two pairs of ceramic sealing rings with different sizes are radially arranged between the inner ring and the shell; the ceramic sealing ring is composed of a group of wide rings and narrow rings, the wide ring I and the wide ring I are symmetrically installed at the top of the inner ring, the narrow ring I and the narrow ring II are correspondingly installed at the bottoms of the wide ring I and the wide ring II, meanwhile, a liquid outlet is fixedly formed in one side wall, close to the wide ring I, of the inner ring, a liquid inlet cavity is formed in a corresponding shell, a liquid inlet is formed in the side wall of the shell of the liquid inlet cavity, a liquid return opening II is formed in one side wall, close to the wide ring II, of the inner ring, a liquid return cavity is formed in the same corresponding shell, a liquid return opening I is formed in the outer wall of the shell corresponding to the liquid return cavity, and meanwhile, the sealing isolation of the two cavities is achieved through a flexible dynamic sealing mechanism between the liquid inlet.

As a further scheme of the invention: inner ring and shell are under the unchangeable condition of appearance structure size, be provided with feed liquor expansion mouth, return liquid expansion mouth one, stock solution expansion mouth and return liquid expansion mouth two on the inner ring, wherein feed liquor expansion mouth (301) and return liquid expansion mouth (401) and inlet (3) and the shape of returning liquid mouth (4) correspond the same respectively, and stock solution expansion mouth (501) and return liquid expansion mouth two (601) correspond the same respectively with the shape of liquid outlet (5) and return liquid mouth two (6), feed liquor expansion mouth (301) and return liquid expansion mouth one (401) and inlet (3) and return liquid mouth one (4) are 180 and distribute simultaneously, and stock solution expansion mouth (501) and return liquid expansion mouth two (601) and liquid outlet (5) and return liquid mouth two (6) are 180 and distribute.

As a further scheme of the invention: chamfers with the angle of 10-30 degrees with the vertical axis are designed on the ceramic sealing ring and the shell.

As a further scheme of the invention: the flexible dynamic sealing mechanism comprises a lining, a flexible sealing ring and a sealing ring cover plate, wherein ceramic is sprayed on the inner side of the lining, an inner ring is installed after the lining is processed, the lining and the shell are sealed together through the flexible sealing ring, and the upper end of the flexible sealing ring is provided with the sealing ring cover plate.

As a further scheme of the invention: the top ends of the inner ring and the outer shell adopt a connecting bearing as a rotary support of the device, and the inner ring and the outer ring of the connecting bearing are respectively connected with the inner ring and the outer shell through screws.

As a further scheme of the invention: the first narrow ring and the second narrow ring are in floating connection with the shell.

As a further scheme of the invention: narrow ring one and narrow ring two constitute by lower narrow ring and last narrow ring, and wherein the mounting groove has been seted up to the bottom of last narrow ring, and lower narrow ring is installed in the mounting groove of last narrow ring, and the upper surface of narrow ring is seted up flutedly down simultaneously, and fixed mounting has the dabber in the recess, and the last fixed surface of dabber installs compensating spring to go up and correspond equally on the narrow ring and seted up flutedly, compensating spring's the other end is connected in the recess that last narrow ring corresponds.

As a further scheme of the invention: the lower narrow ring and the shell are sealed through an auxiliary sealing ring.

As a further scheme of the invention: the first wide ring, the second wide ring and the inner ring are stirred to rotate through an anti-rotation mechanism arranged on the inner ring.

As a still further scheme of the invention: the shell and the inner ring are made of high-strength and high-elasticity-modulus anticorrosive materials such as stainless steel or titanium alloy.

Compared with the prior art, the invention has the beneficial effects that:

1. in order to prevent the ceramic material from being damaged due to different thermal expansion coefficients of dissimilar materials, the invention innovatively designs an integral ceramic ring structure and reduces the matching of structural parts made of different materials;

2. in order to adapt to severe working environments such as vibration impact, wide temperature range and the like, the device is made of anticorrosive materials with high strength and high elastic modulus, and the mechanical seal can be ensured to stably operate without maintenance for a long time;

3. the mechanical sealing device is also provided with a flexible dynamic sealing structure, so that in order to improve the reliability and the service life of the flexible dynamic sealing, the surface of a metal piece matched with the mechanical sealing device is sprayed with a ceramic material to improve the hardness and the wear resistance of the metal piece while selecting a proper composite flexible sealing form and a proper mounting structure;

4. the invention provides a set of double-channel radial distributed expandable mechanical sealing device which can adapt to severe environments such as vibration, impact, wide temperature range and the like, the service life of the device can reach 20000 hours or 5 years, and the problems that the axial installation size is short and the fluid needs to be transmitted in a rotating manner are solved.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention.

Fig. 2 is a bottom view of the present invention.

Fig. 3 is a top view of the present invention.

FIG. 4 is a schematic view of a flow channel of the present invention in partial detail.

Fig. 5 is a schematic structural diagram of the flexible dynamic sealing mechanism of the invention.

Fig. 6 is a schematic view of a narrow ring structure according to the present invention.

As shown in the figure: 1. the flexible dynamic sealing device comprises a liquid inlet cavity, 2, a liquid return cavity, 3, a liquid inlet, 301, a liquid inlet expansion port, 4, a liquid return port I, 401, a liquid return expansion port I, 5, a liquid outlet, 501, a liquid storage expansion port, 6, a liquid return port II, 601, a liquid return expansion port II, 7, a narrow ring I, 8, a wide ring I, 9, a narrow ring II, 10, a wide ring II, 11, a flexible dynamic sealing mechanism, 12, a connecting bearing, 13, an inner ring, 14, a shell, 15, a compensating spring, 16, an auxiliary sealing ring, 17, a chamfer, 18, a bushing, 19, a flexible sealing ring, 20, a sealing ring cover plate, 21, a lower narrow ring, 22, an upper narrow ring, 23 and a mandrel.

Detailed Description

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

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 6, in the embodiment of the present invention, the two-channel radial distributed expandable mechanical sealing device includes a housing 14, an inner ring 13, a ceramic sealing ring, and a flexible dynamic sealing mechanism 11, where the inner ring 13 is rotatably installed inside the housing 14, and two pairs of different ceramic sealing rings are radially arranged between the inner ring 13 and the housing 14 to realize the rotary dynamic sealing of the device to an outer boundary; wherein the ceramic sealing ring consists of a group of wide rings and narrow rings, a first wide ring 8 and a second wide ring 10 are symmetrically arranged at the top of an inner ring 13, and the narrow ring I7 and the narrow ring II 9 are correspondingly arranged at the bottom of the wide ring I8 and the wide ring II 10, thereby forming a ceramic sealing ring whole body, the inner ring 13 and the outer shell 14 are sealed, a liquid outlet 5 is fixedly arranged on one side wall of the inner ring 13 close to the first wide ring 8, a liquid inlet cavity 1 is arranged on the corresponding shell 14, a liquid inlet 3 is arranged on the side wall of the shell 14 of the liquid inlet cavity 1, meanwhile, one side wall of the inner ring 13 close to the wide ring II 10 is provided with a liquid return port II 6, the same corresponding shell 14 is provided with a liquid return cavity 2, and the outer wall of the shell 14 corresponding to the liquid return cavity 2 is provided with a liquid return port I4, and meanwhile, the liquid inlet cavity 1 and the liquid return cavity 2 are sealed and isolated by a flexible dynamic sealing mechanism 11.

Referring to fig. 2 to 3, under the condition that the external structural size of the inner ring 13 and the outer shell 14 is not changed, the inner ring 13 is provided with a liquid inlet expansion port 301, a liquid return expansion port 401, a liquid storage expansion port 501 and a liquid return expansion port 601, wherein the shapes of the liquid inlet expansion port 301 and the liquid return expansion port 401, the liquid inlet 3 and the liquid return port 4 are respectively corresponding to the same, the shapes of the liquid storage expansion port 501 and the liquid return expansion port 601, the liquid outlet 5 and the liquid return port 6 are respectively corresponding to the same, the liquid inlet expansion port 301 and the liquid return expansion port 401, the liquid inlet 3 and the liquid return port 4 are distributed at 180 °, the liquid storage expansion port 501 and the liquid return expansion port 601, the liquid outlet 5 and the liquid return port 6 are distributed at 180 °, so as to reduce the flow resistance and expand the flow capacity of the device, the medium flow direction is shown by the arrow in fig. 2, and only one pair of arrows originally flows, after increasing the extension mouth, become two pairs of arrow heads and flow, the through-flow capacity obviously increases, simultaneously because the device can rotate when normally working, advances back the liquid mouth relative position and can the periodic variation, consequently in order to reduce to rotate in-process liquid flow undulant, the extension mouth is 180 distributions with original feed liquor or back the liquid mouth, and the opening size is the same with original advance back the liquid mouth.

Wherein, the liquid flow channel is formed by the sealing ring and the metal structural component together, in order to enlarge the flow area as much as possible and optimize the stress condition of the ceramic ring and the metal structural component, a chamfer 17 with an angle of 10 degrees to 30 degrees with the vertical axis is designed on the ceramic sealing ring and the shell 1; the arrangement of the angle can ensure that the ceramic sealing ring has enough supporting rigidity, can simultaneously expand the flow area to the maximum extent, avoids generating turbulent flow, reduces the resistance when the fluid flows, ensures smooth flow and small flow fluctuation, and simultaneously the chamfer 17 on the shell 1 is also used as a powerful supporting structure of the flexible dynamic sealing mechanism 11 while expanding the flow area and reducing stress concentration.

Preferably, the flexible dynamic sealing mechanism 11 includes a bushing 18, a flexible sealing ring 19 and a sealing ring cover plate 20, since the surface to be painted with ceramic is in the annular groove, this structure cannot be painted with ceramic, therefore, a bushing 18 is added, ceramic is painted on the inner side of the bushing 18, and the inner ring 13 is installed after the processing is completed, thereby solving the problem that ceramic cannot be painted, and meanwhile, the bushing 18 and the housing 14 are sealed together by the flexible sealing ring 19, and the upper end of the flexible sealing ring 19 is provided with a sealing ring cover plate 20, which has two functions: 1) the installation of the flexible sealing ring is changed into open installation, so that the sealing ring is prevented from being damaged in the installation process; 2) because the flexible sealing ring and the inner ring have higher matching precision, if the flexible sealing ring is not positioned in the assembling process, the sealing ring can be sheared and damaged by a metal piece, so that the cover plate can play a role in guiding when the inner ring is assembled, and the sealing ring is prevented from being sheared.

Preferably, the top ends of the inner ring 13 and the outer shell 14 adopt a single connecting bearing 12 capable of eliminating backlash as a rotary support of the device, so that the rigidity and the stability of the rotary support are improved, the ceramic sealing ring is ensured to be reliably attached all the time in the rotary process, and meanwhile, the inner ring and the outer ring of the connecting bearing 12 are respectively connected with the inner ring and the outer shell through screws, so that the rotation between the inner ring and the outer shell is realized.

Preferably, the narrow ring I7 and the narrow ring II 9 are in floating connection with the shell 14, the connection mode ensures that the narrow ring can swing along with the wide ring in the rotation process and is always attached to the narrow ring I7 and the narrow ring II 9, meanwhile, the narrow ring I7 and the narrow ring II 9 consist of a lower narrow ring 21 and an upper narrow ring 22, a mounting groove is formed in the bottom of the upper narrow ring 22, the lower narrow ring 21 is mounted in the mounting groove of the upper narrow ring 22, a groove is formed in the upper surface of the lower narrow ring 21, a mandrel 23 is fixedly mounted in the groove, a compensation spring 15 is fixedly mounted on the upper surface of the mandrel 23, a groove is correspondingly formed in the upper narrow ring 22, the other end of the compensation spring 15 is connected to the groove corresponding to the upper narrow ring 22, and the compensation spring 15 can automatically compensate after the narrow ring is worn and ensures that the wide ring and the narrow ring; at the same time, the lower narrow ring 21 and the outer shell 14 are sealed by the auxiliary sealing ring 16.

Preferably, the first wide ring 8, the second wide ring 10 and the inner ring 13 are poked to rotate through an anti-rotation mechanism arranged on the inner ring 13, so that the relative rotation between the first wide ring and the inner ring is prevented.

Preferably, the outer shell 14 and the inner ring 13 are made of high-strength and high-elasticity-modulus anticorrosive materials such as stainless steel or titanium alloy, the rigidity of the outer shell and the inner ring is improved, the stability problem of the high-precision ceramic sealing ring in the operation process is solved, the sealing ring can be ensured to be always reliably attached, and the mechanical sealing performance and the adverse environment resistance performance are improved. Meanwhile, stainless steel or titanium alloy materials are adopted, so that the corrosion of a sealing medium and the corrosion of the external environment to the device can be resisted.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention without departing from the spirit and scope of the invention.

Claims

1. The expandable mechanical sealing device with the two channels distributed radially comprises a shell (14), an inner ring (13), a ceramic sealing ring and a flexible dynamic sealing mechanism (11), and is characterized in that: the inner ring (13) is rotatably arranged inside the shell (14), and two pairs of ceramic sealing rings with different sizes are radially arranged between the inner ring (13) and the shell (14); wherein the ceramic sealing ring consists of a group of wide rings and narrow rings, a wide ring I (8) and a wide ring II (10) are symmetrically arranged at the top of the inner ring (13), and the narrow ring I (7) and the narrow ring II (9) are correspondingly arranged at the bottoms of the wide ring I and the wide ring II (10), meanwhile, a liquid outlet (5) is fixedly arranged on one side wall of the inner ring (13) close to the wide ring I (8), a liquid inlet cavity (1) is arranged on the corresponding shell (14), a liquid inlet (3) is arranged on the side wall of the shell (14) of the liquid inlet cavity (1), meanwhile, one side wall of the inner ring (13) close to the wide ring II (10) is provided with a liquid return port II (6), the same corresponding shell (14) is provided with a liquid return cavity (2), a first liquid return port (4) is arranged on the outer wall of the shell (14) corresponding to the liquid return cavity (2), meanwhile, the liquid inlet cavity (1) and the liquid return cavity (2) are sealed and isolated by a flexible dynamic sealing mechanism (11).

2. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: inner ring (13) and shell (14) are under the unchangeable condition of appearance structure size, be provided with feed liquor expansion mouth (301), return liquid expansion mouth (401), stock solution expansion mouth (501) and return liquid expansion mouth two (601) on inner ring (13), feed liquor expansion mouth (301) and return liquid expansion mouth one (401) correspond the same with inlet (3) and the shape of returning liquid mouth one (4) respectively to the shape of stock solution expansion mouth (501) and return liquid expansion mouth two (601) and liquid outlet (5) and return liquid mouth two (6) corresponds the same respectively, and feed liquor expansion mouth (301) and return liquid expansion mouth one (401) are 180 distributions with inlet (3) and return liquid mouth one (4) simultaneously, and stock solution expansion mouth (501) and return liquid expansion mouth two (601) and liquid outlet (5) and return liquid mouth two (6) are 180 distributions.

3. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: chamfers (17) with an angle of 10-30 degrees with the vertical axis are designed on the ceramic sealing ring and the shell (14).

4. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: the flexible dynamic sealing mechanism (11) comprises a lining (18), a flexible sealing ring (19) and a sealing ring cover plate (20), wherein ceramic is sprayed on the inner side of the lining (18), an inner ring (13) is installed after the ceramic is processed, the lining (18) and the shell (14) are sealed together through the flexible sealing ring (19), and the sealing ring cover plate (20) is arranged at the upper end of the flexible sealing ring (19).

5. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: the top ends of the inner ring (13) and the outer shell (14) adopt a connecting bearing (12) as a rotary support of the device, and the inner ring and the outer ring of the connecting bearing (12) are respectively connected with the inner ring and the outer shell through screws.

6. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: the narrow ring I (7) and the narrow ring II (9) are in floating connection with the outer shell (14).

7. The dual channel radially distributed expandable mechanical seal of claim 6, wherein: narrow ring one (7) and narrow ring two (9) are by narrow ring (21) down with go up narrow ring (22) and constitute, wherein the mounting groove has been seted up to the bottom of last narrow ring (22), install in the mounting groove of last narrow ring (22) down narrow ring (21), the upper surface of narrow ring (21) is seted up flutedly down simultaneously, fixed mounting has dabber (23) in the recess, the last fixed surface of dabber (23) installs compensating spring (15), and go up same correspondence on narrow ring (22) and set up flutedly, the other end of compensating spring (15) is connected in the recess that last narrow ring (22) correspond.

8. The dual channel radially distributed expandable mechanical seal of claim 7, wherein: the lower narrow ring (21) and the shell (14) are sealed by an auxiliary sealing ring (16).

9. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: the wide ring I (8), the wide ring II (10) and the inner ring (13) are stirred to rotate through an anti-rotation mechanism arranged on the inner ring (13).

10. The dual channel radially distributed expandable mechanical seal of claim 1, wherein: the shell (14) and the inner ring (13) are made of stainless steel or titanium alloy high-strength and high-elasticity-modulus anticorrosive materials.