CN219809164U - Non-contact dry gas sealing device for lead bismuth pump - Google Patents
Non-contact dry gas sealing device for lead bismuth pump Download PDFInfo
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- CN219809164U CN219809164U CN202321203609.XU CN202321203609U CN219809164U CN 219809164 U CN219809164 U CN 219809164U CN 202321203609 U CN202321203609 U CN 202321203609U CN 219809164 U CN219809164 U CN 219809164U
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- 238000007789 sealing Methods 0.000 title claims abstract description 276
- 229910052797 bismuth Inorganic materials 0.000 title claims abstract description 30
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 230000003068 static effect Effects 0.000 claims abstract description 121
- 238000003825 pressing Methods 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 147
- 239000000306 component Substances 0.000 description 52
- 238000000034 method Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 8
- 239000010687 lubricating oil Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Mechanical Sealing (AREA)
Abstract
The utility model discloses a non-contact dry gas sealing device for a lead bismuth pump, which relates to the field of dry gas sealing and comprises a shaft sleeve, a dry gas sealing component and a parking sealing component, wherein the dry gas sealing component and the parking sealing component are arranged on the shaft sleeve, the parking sealing component comprises a parking sealing static ring and a parking sealing static ring seat, an elastic element and a pressing sleeve are arranged on the parking sealing static ring, the pressing sleeve is arranged on the atmosphere side of the parking sealing static ring, one end of the elastic element is fixed on one side of a dry gas sealing component medium, the other end of the elastic element is a free end and protrudes towards the parking sealing static ring, the dry gas sealing component comprises a dry gas medium side static ring seat arranged on one side of the medium, a third sealing ring is arranged between the dry gas sealing medium side static ring seat and the parking sealing static ring, and the cross section of the parking sealing static ring is in a T shape.
Description
Technical Field
The utility model relates to a dry gas sealing device, in particular to a non-contact dry gas sealing device for a lead bismuth pump.
Background
The medium conveyed by the lead bismuth pump is high Wen Qianbi alloy, the pump is used as a main circulating pump of the lead bismuth cooling fast reactor, and the safe operation of the pump is critical to the safety of the lead bismuth cooling fast reactor. The seal is used as one of core components of the lead bismuth pump, and has the function of sealing the high-temperature medium in the lead bismuth pump from leaking outwards, preventing the heat of the high-temperature medium from being dissipated, and simultaneously preventing the external atmosphere from entering the pump. In order to solve the problems that the conventional mechanical seal structure is complex in design and large in external dimension, and is in contact type seal, the sealing surfaces of the movable ring and the static ring are mutually contacted in the operation process, so that the power consumption of the whole equipment is increased, and meanwhile, cooling liquid is required for cooling the sealing end face in the type of seal, a novel non-contact type gas seal structure is adopted in the market to replace the mechanical seal structure.
Although the above problems are solved by combining the dry gas seal and the parking seal, since the parking seal stationary ring of the existing parking seal structure is generally designed to have a structure with an axial cross section similar to a Z shape, such as the published patent document CN214007590U, when the parking seal is closed, a plurality of air seals also have gas pressure, and at this time, the elastic element needs to overcome the resistance of the parking seal stationary ring seal ring, and also needs to overcome the gas pressure of the dry gas seal, and at this time, the spring force of the elastic element needed is very large, so that the parking seal can be opened. Meanwhile, the spring force to be overcome before the parking seal is closed is very large, the needed parking seal air source pressure is directly high, in addition, the elastic element is designed to overcome the resistance of the sealing ring and the dry air seal without pressure according to the requirement, and once the dry air seal is introduced into pressure during field misoperation, the risk that the parking seal cannot be opened exists after the parking seal is closed. The "Z" configuration of the parking seal dead ring does not detect whether the parking seal has been opened, which could directly result in failure of the parking seal if the pump is activated.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model aims to provide a non-contact dry gas sealing device for a lead bismuth pump, which comprises a dry gas sealing component and a parking sealing component, and solves the problem that the opening or closing state of a parking sealing static ring can be controlled by the excessive elasticity or air source pressure by forming a T-shaped section by a first section and a second section of the parking sealing static ring along the cross section of a rotating shaft.
The embodiment of the utility model is realized by the following technical scheme: the non-contact dry gas sealing device for the lead bismuth pump comprises a shaft sleeve, a dry gas sealing component and a parking sealing component, wherein the dry gas sealing component and the parking sealing component are arranged on the shaft sleeve, the parking sealing component is arranged on one side of a medium, the dry gas sealing component is arranged on one side of the atmosphere, the parking sealing component comprises a parking sealing static ring and a parking sealing static ring seat, a first sealing ring is arranged between the parking sealing static ring and the parking sealing static ring seat, the parking sealing static ring seat is arranged on one side of the medium, an elastic element and a pressing sleeve are arranged on the parking sealing component, the pressing sleeve is arranged on one side of the atmosphere of the parking sealing static ring, one end of the elastic element is fixed on one side of the medium of the dry gas sealing component, and the other end of the elastic element is a free end and protrudes towards the parking sealing static ring;
the dry gas sealing component comprises a dry gas sealing medium side static ring seat arranged on one side of the medium, a third sealing ring is arranged between the parking sealing static ring and the dry gas sealing medium side static ring seat, the cross section of the parking sealing static ring is in a T shape, the cross section of the parking sealing static ring is composed of a first section and a second section, the second section is attached to the shaft sleeve, the first section is perpendicular to the second section and far away from the rotating shaft, the free end of the elastic element protrudes towards the first section, the parking sealing static ring seat, the parking sealing static ring and the dry gas sealing component form a closed space, the first section is arranged in the closed space, and the closed space is communicated with the parking sealing air inlet.
Preferably, the parking seal member includes a parking seal ring provided on an atmosphere side, the parking seal ring and the pressing sleeve being provided as a common member.
Preferably, the dry gas seal member is disposed above the parking seal member, and the parking seal ring is disposed above the parking seal stationary ring.
Preferably, the parking seal stationary ring adopts an unbalanced structure.
Preferably, the dry gas seal component comprises a drive ring assembly and an atmospheric side stationary ring assembly, the drive ring assembly is disposed on one side of the atmosphere, the atmospheric side stationary ring assembly comprises an atmospheric side stationary ring seat, and the atmospheric side stationary ring seat and the drive ring assembly form a labyrinth structure.
Preferably, the parking seal component is provided with a parking seal air inlet, and the dry gas seal component is provided with a main seal air inlet.
Preferably, the dry gas seal component comprises a dry gas seal media side seal assembly and a dry gas seal atmosphere side seal assembly, the dry gas seal media side seal assembly being disposed on a media side, the dry gas seal atmosphere side seal assembly being disposed on an atmosphere side.
Preferably, the dry gas sealing medium side sealing assembly comprises a dry gas sealing medium side moving ring, the dry gas sealing atmosphere side sealing assembly comprises a dry gas sealing atmosphere side moving ring, and microscopic grooves are formed in the dry gas sealing medium side moving ring sealing end face and the dry gas sealing atmosphere side moving ring sealing end face.
Preferably, the thickness of the gas film formed on the sealing end surface of the dry gas sealing assembly is 2-5 μm.
Preferably, the dry gas sealing medium side moving ring and the dry gas sealing atmosphere side moving ring are both made of ceramics; the dry gas sealing medium side sealing assembly comprises a dry gas sealing medium side static ring, the dry gas sealing atmosphere side sealing assembly comprises a dry gas sealing atmosphere side static ring, and the dry gas sealing medium side static ring and the dry gas sealing atmosphere side static ring are both made of graphite.
Compared with the prior art, the embodiment of the utility model has the following advantages and beneficial effects:
1. the embodiment of the utility model has the structural characteristics that the inner diameter and the outer diameter of the end face of the parking seal static ring are the same as the effective outer diameter of the back of the parking seal static ring acted by the pressure of the parking seal air, and after the parking seal static ring is closed, the parking seal static ring can be opened by the elasticity of the elastic element only by overcoming the friction resistance of the sealing ring under the structure.
2. According to the embodiment of the utility model, the parking seal movable ring and the dry gas seal compression sleeve are of a shared structure, so that the overall axial dimension length of the seal is reduced, the installation space of the pump is saved, and the structure is applicable to the situation that the axial dimension of the seal installation position of the pump is shorter; the parking seal moving ring is arranged on the shaft sleeve of the dry air seal in a container mode, and the structure is characterized in that the fixing and transmission of the parking seal moving ring can be realized without independently processing a ring groove for fixing the parking seal moving ring on the pump shaft, and the influence on the strength of the pump shaft caused by processing the ring groove on the pump shaft can be avoided.
3. The parking seal movable ring is arranged above the parking seal stationary ring, and the parking seal stationary ring has upward parking seal closing force under the action of parking seal gas, and is just opposite to the gravity direction of the pump shaft.
4. According to the embodiment of the utility model, the labyrinth type oil blocking structure is arranged between the dry gas sealing driving ring assembly and the dry gas sealing atmospheric side static ring seat, so that the influence of leaked lubricating oil in the bearing on the pump on the service life of the dry gas sealing is avoided.
In general, the non-contact dry gas sealing device for the lead-bismuth pump provided by the embodiment of the utility model is simple and convenient in parking sealing control, reduces the overall axial dimension length of the seal, saves the installation space of the pump, and has good sealing effect and long service life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a non-contact dry gas sealing device for a lead bismuth pump according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a side end face groove of a dry gas sealing medium in accordance with an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an end face groove of a dry gas seal atmosphere side dynamic ring provided by an embodiment of the utility model;
in the drawings, the reference numerals and corresponding part names:
1-shaft sleeve, 2-third sealing ring, 4-parking sealing static ring, 5-parking sealing static ring seat, 6-first sealing ring, 7-elastic element, 8-pressing sleeve, 9-second sealing ring, 10-first section, 11-second section, 12-parking sealing dynamic ring, 13-dry gas sealing medium side static ring seat, 14-driving ring component, 15-atmosphere side static ring component, 16-atmosphere side static ring seat, 17-parking sealing air inlet, 18-main sealing air inlet, 19-dry gas sealing medium side sealing component, 20-dry gas sealing atmosphere side sealing component, 21-dry gas sealing medium side dynamic ring, 22-micro groove, 23-dry gas sealing atmosphere side dynamic ring, 24-dry gas sealing medium side static ring and 25-dry gas sealing atmosphere side static ring.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Examples
As shown in fig. 1-3, the utility model provides a non-contact dry gas sealing device for a lead bismuth pump, which comprises a shaft sleeve 1, and a dry gas sealing component and a parking sealing component which are arranged on the shaft sleeve 1, wherein the parking sealing component is arranged on one side of a medium, the dry gas sealing component is arranged on one side of the atmosphere, and the non-contact dry gas sealing structure is adopted, so that the power consumption of the pump can be reduced, and meanwhile, the pollution to a process medium in the pump is avoided by adopting gas sealing. The parking seal component comprises a parking seal static ring 4 and a parking seal static ring seat 5, a first sealing ring 6 is arranged between the parking seal static ring 4 and the parking seal static ring seat 5, the parking seal static ring seat 5 is arranged on one side of a medium, an elastic element 7 and a compression sleeve 8 are arranged on the parking seal component, one end of the compression sleeve 8 is in contact with one end of the parking seal static ring 4 and is coaxially arranged, the compression sleeve 8 is arranged on the atmosphere side of the parking seal static ring, one end of the elastic element 7 is fixed on one side of the dry gas seal component medium, and the other end of the elastic element 7 is a free end and protrudes towards the parking seal static ring 4; the dry gas sealing component comprises a dry gas sealing medium side static ring seat 13 arranged on one side of a medium, a third sealing ring 2 is arranged between a parking sealing static ring 4 and the dry gas sealing medium side static ring seat 13, the cross section of the parking sealing static ring 4 is in a T shape, the cross section of the parking sealing static ring is composed of a first section 10 and a second section 11, the second section 11 is attached to the shaft sleeve 1, the first section 10 is perpendicular to the second section 11 and is far away from a rotating shaft, the free end of the elastic element 7 protrudes towards the first section 10, the parking sealing static ring seat 5, the parking sealing static ring 4 and the dry gas sealing component form a closed space, the first section 10 is arranged in the closed space, and the closed space is communicated with the parking sealing air inlet 17. The direction of the rotation axis here is along the direction of the medium side to the atmosphere side, and the sealing device is a columnar structure, and the rotation axis coincides with the axial center line of the columnar structure.
Specifically, through ventilation of the parking seal air inlet 17, the air pressure acts on the annular area formed by the first section 10 of the parking seal static ring 4 to generate the air pressure of the parking seal static ring 4 along the air side direction, after the air pressure overcomes the reverse axial force generated by the medium in the pump acting on the sealing end face of the parking seal static ring 4, the friction resistance of the first sealing ring 6 and the third sealing ring 2 and the spring force of the elastic element 7, the parking seal static ring 4 is pushed to the parking seal static ring 4 along the air side direction until the parking seal static ring is attached to the end face of the pressing sleeve 8, at the moment, the parking seal is closed, and the sealing of the parking seal end face is realized through the sealing ring on the sealing end face of the parking seal static ring 4, so that the medium in the pump is prevented from leaking to the air environment from the sealing end face of the parking seal static ring 4, and the air environment is prevented from leaking into the pump. The elastic element 7 is used for controlling the floatability of the parking seal static ring 4 and controlling the opening of the parking seal static ring 4, because after the parking seal gas is decompressed, no matter whether the pressure exists in the pump and the atmosphere side, the friction resistance of the first sealing ring 6 and the third sealing ring 2 needs to be overcome, and the end face of the parking seal static ring 4 and the end face of the pressing sleeve 8 can be separated from each other, so that the normal opening of the parking seal is realized. In the embodiment of the present utility model, further, the first sealing ring 6 and the third sealing ring 2 are O-shaped sealing rings, in other embodiments, the O-shaped sealing rings are not necessarily required as long as the sealing effect can be achieved, meanwhile, in the embodiment of the present utility model, a plurality of sealing rings are used, the use of the sealing rings is a conventional technical means of those skilled in the art, and other sealing rings except the first sealing ring 6 and the third sealing ring 2 will not be distinguished and described in detail.
The parking seal stationary ring 4 is arranged to be similar to a T-shaped structure, and the structure is characterized in that the inner diameter and the outer diameter of the end face of the parking seal stationary ring 4 are the same as the effective outer diameter of the back of the parking seal stationary ring 4 under the condition that the parking seal stationary ring 4 is closed, and the elastic force of the elastic element 7 only needs to overcome the friction resistance of the first sealing ring 6 and the third sealing ring 2 to push the parking seal stationary ring 4 to an axial medium side at the moment under the structure, so that the parking seal stationary ring 4 is opened. The advantage of this construction is that the parking seal can be opened by the action of the resilient element 7, irrespective of the pressure in the pump and the dry gas seal, as long as the parking seal gas source pressure is let down.
Further, the parking seal member includes a parking seal ring 12 disposed on the atmosphere side, the parking seal ring 12 and the compression sleeve 8 are disposed as a common member, in this embodiment, the parking seal ring 12 and the compression sleeve 8 sealed by dry gas are of a common structure, the structural design can reduce the overall axial dimension of the seal while saving the installation space of the pump, and the structure of this embodiment is applicable to the case where the axial dimension of the seal installation position of the pump is relatively short, but in other embodiments, the parking seal ring 12 may also be disposed as a non-common structure, and this structure is applicable to the case where the axial dimension of the seal installation position of the pump is sufficiently long. Returning to the embodiment of the utility model, the parking seal moving ring 12 is assembled on the shaft sleeve 1 of the dry gas seal, and the structure is characterized in that the fixing and the transmission of the parking seal moving ring 12 can be realized without separately processing a ring groove for fixing the parking seal moving ring 12 on the pump shaft, and compared with the fixing and the transmission of the parking seal moving ring 12 in other embodiments by clamping a resolution snap ring in the ring groove on the pump shaft, the structure can avoid influencing the strength of the pump shaft by processing the ring groove on the pump shaft.
Further, the dry gas sealing component is arranged above the parking sealing component, the parking sealing movable ring 12 is arranged above the parking sealing stationary ring 4, namely, the parking sealing movable ring 12 is arranged above the parking sealing stationary ring 4, and the parking sealing stationary ring 4 is upwards in parking sealing closing force under the action of parking sealing gas, and is just opposite to the gravity direction of the pump shaft. In other embodiments, if the parking seal ring 12 is located below the parking seal stationary ring 4, the force of the pump shaft on the upper end bearing of the pump will be increased when the parking seal closing force is downward, which is the same as the gravity direction of the pump shaft, and the bearing capacity requirement is higher. Of course, there are also embodiments that are not arranged in an up-down configuration, i.e. the parking seal ring 12 and the parking seal stationary ring 4 may be arranged in the same horizontal plane, so that the above-mentioned problems do not exist.
Furthermore, the parking seal stationary ring 4 adopts an unbalanced structure, so that the parking seal can still be normally opened and closed under any state, and the leakage of a process medium of the lead-bismuth pump is avoided.
Further, the dry gas seal component comprises a drive ring component 14 and an atmosphere side static ring component 15, the drive ring component 14 is arranged on one atmosphere side, the atmosphere side static ring component 15 comprises an atmosphere side static ring seat 16, the atmosphere side static ring seat 16 and the drive ring component form a labyrinth structure, the purpose is to prevent lubricating oil in a bearing above a pump from being transferred to a bearing position through pump shaft heat conduction due to high temperature in the pump, and the lubricating oil in the bearing is heated and then flows downwards into the dry gas seal atmosphere side seal position along the pump shaft, so that the dry gas seal operation is ensured to be stable and reliable.
Further, a parking seal air inlet 17 is arranged on the parking seal component, a main seal air inlet 18 is arranged on the dry air seal component, and the parking seal and the dry air seal adopt independent air inlet interfaces, so that the parking seal air is introduced from the parking seal air inlet as shown in fig. 1, and the dry air seal air is introduced from the main seal air inlet, so that the parking seal can still be normally used after the dry air seal fails.
Further, the dry gas sealing component comprises a dry gas sealing medium side sealing component 19 and a dry gas sealing atmosphere side sealing component 20, the dry gas sealing medium side sealing component 19 is arranged on one side of the medium, the dry gas sealing atmosphere side sealing component 20 is arranged on one side of the atmosphere, in the embodiment of the utility model, the dry gas sealing medium side sealing component comprises a dry gas sealing medium side moving ring 21, the dry gas sealing atmosphere side sealing component comprises a dry gas sealing atmosphere side moving ring, microscopic grooves 22 are formed in the sealing end face of the dry gas sealing medium side moving ring 21 and the sealing end face of the dry gas sealing atmosphere side moving ring, and the thickness of a gas film formed by the sealing end face of the dry gas sealing component is 2-5 μm.
Specifically, in the embodiment of the present utility model, the non-contact dry gas seal structure is a cartridge type structure, that is, the parking seal ring 12 is not required to be separately mounted or dismounted, so that the convenience of mounting and dismounting the parking seal is increased. The working height of the parking seal is not required to be measured during field installation, and meanwhile, the axial adjustment of the pump shaft does not influence the normal working height of the parking seal moving ring 12, so that the sealing performance of the parking seal is not influenced, the dry gas sealing medium side moving ring 21 and the dry gas sealing atmosphere side moving ring 23 are both made of ceramics, the ceramic has high heat conductivity, excellent heat conductivity, small thermal expansion coefficient, high hardness, good wear resistance, good thermal shock resistance and thermal shock resistance, high limit working temperature, small density and small rotary inertia, and the sealing ring is an ideal rotary ring material for the dry gas seal of the lead bismuth pump. The seal end surfaces of the dry gas seal medium side moving ring 21 and the dry gas seal atmosphere side moving ring 23 are engraved with microscopic grooves 22.
Further, in the embodiment of the utility model, the dry gas sealing medium side static ring 24 and the dry gas sealing atmosphere side static ring 25 are both made of graphite, and the graphite has the excellent characteristics of good self-lubricating performance, low friction coefficient, good corrosion resistance, good heat conductivity, low linear expansion coefficient, good temperature resistance and the like. The carbon graphite has high thermal conductivity, can timely guide out heat generated by friction on the friction surface, avoids rapid aggregation and temperature rise of the friction surface due to friction, and ensures normal operation of the system. In addition, the carbon graphite has low expansibility, small thermal deformation when the temperature is changed, can effectively maintain the shape of the sealing surface, and avoids the problem of medium leakage caused by thermal deformation. Meanwhile, the carbon graphite material has good thermal stability, and is not easy to generate defects due to the change of internal stress when bearing the severe change of temperature.
In the embodiment of the utility model, the non-contact dry gas seal adopts gas film seal, and the seal gas adopts inert gas argon, so that the gas does not pollute a process medium in the lead bismuth pump. Under the action of rotation of the micro groove 22, the sealing end face of the air film seal is in a non-contact running state, the thickness of the air film is about 2-5 mu m, and a friction pair formed by a dynamic ring and a static ring of the dry gas seal is free from abrasion, so that the dry gas seal has low power consumption, about 5% of that of a contact mechanical seal, and meanwhile, the stable and reliable sealing running and long-time service life are ensured.
Further, the driving ring assembly 14 in the non-contact dry gas seal in the embodiment of the utility model adopts a wedge structure, so that the reliability of transmission is ensured; meanwhile, an O-shaped sealing ring is arranged on the driving ring assembly 14, and a labyrinth structure is designed between the driving ring assembly 14 and the dry gas sealing atmospheric side static ring seat 16, so that lubricating oil in a bearing above a pump is prevented from being transferred to a bearing position through pump shaft heat conduction due to high temperature in the pump, and the lubricating oil in the bearing is heated and then flows downwards into a dry gas sealing atmospheric side friction pair position along the pump shaft, and the dry gas sealing operation is ensured to be stable and reliable.
In the embodiment of the utility model, the parking seal stationary ring 4 and the parking seal cavity form a container type. The parking seal friction pair adopts a hard seal and a hard seal assembly. The parking seal moving ring 12 and the compressing sleeve 8 at the dry gas sealing medium side are mutually shared parts, so that the sealing outline size and the installation space of the pump can be reduced, and the cost is saved for customers. The parking seal stationary ring 4 adopts an unbalanced running structure, and even if the dry gas seal fails, the parking seal can still be installed to be closed and opened.
Further, the parking seal static ring 4 and the O-shaped sealing ring are arranged in a dry gas seal static ring seat, the floatability of the parking seal static ring 4 is controlled through an elastic element 7, the parking seal static ring 4 and the end face of a compression sleeve 8 are in a non-closed state, the parking seal static ring seat 5 and the O-shaped sealing ring are arranged on the parking seal static ring 4, the O-shaped sealing ring is arranged in a groove of the parking seal static ring, and the parking seal static ring seat 5 and the dry gas seal static ring seat are connected into a whole through an inner hexagon screw to form a container type parking seal. The parking seal gas enters into a closed space formed by the parking seal static ring seat 5, the parking seal static ring 4 and the dry gas seal component through the parking seal gas inlet, and the parking seal static ring 4 is pushed to the end face of the pressing sleeve 8 under the action of the parking seal gas pressure until the parking seal static ring 4 is attached to the end face of the pressing sleeve 8.
Further, the shaft sleeve 1 is mounted on the rotary shaft, and the dry gas sealing medium side moving ring 21 is fitted into the shaft sleeve 1, and the dry gas sealing medium side moving ring 21 is adjusted to center and back seal by the O-ring. The compression sleeve 8 is installed in the shaft sleeve 1 and is used for limiting the downward movement of the dry gas sealing medium side movable ring 21. The two sealing rings are respectively arranged in the pressing sleeve 8 and the shaft sleeve 1, so that the process medium in the pump is prevented from leaking to the atmosphere from the rotating shaft, and the process gas in the pump is prevented from leaking into the dry gas sealing cavity when the stopping sealing end face is closed.
Further, the dry gas seal atmosphere side moving ring 23 is installed in the shaft sleeve 1, the dry gas seal atmosphere side moving ring 23 is adjusted to be centered and back sealed through the O-shaped sealing ring, and the driving ring is installed in the shaft sleeve 1 and used for limiting upward movement of the dry gas seal atmosphere side moving ring 23. The O-shaped sealing ring is arranged in the groove of the driving ring, so that lubricating oil in the bearing at the upper end of the lead bismuth pump is prevented from flowing from the inner surface and the outer surface of the shaft sleeve 1 to the end face of the dry gas sealing atmosphere side moving ring 23. The drive ring is pressed into the drive ring by tightening the outer hex screw and constitutes the drive ring assembly 14. The driving ring assembly 14 with the wedge-shaped structure tightly holds the shaft sleeve 1 to the rotating shaft by tightening the outer hexagon screw, so that the shaft sleeve 1 and the rotating shaft rotate together. A labyrinth type oil blocking structure is arranged between the driving ring and the dry gas seal atmosphere side static ring seat 16, lubricating oil on the surface of the driving ring is thrown out through centrifugal force generated by the operation of the driving ring, and the lubricating oil is prevented from flowing into the end face of the dry gas seal atmosphere side dynamic ring 23 through the labyrinth type oil blocking structure.
Further, an elastic element 7, an O-shaped sealing ring and a dry gas sealing medium side static ring 24 are sequentially arranged in the dry gas sealing medium side static ring 24 seat; the floating property of the static ring 24 at the side of the dry gas sealing medium is regulated by the elastic element 7; the dry gas sealing medium side static ring 24 and the dry gas sealing medium side static ring 24 seat are subjected to axial and radial bidirectional static sealing through the push ring and the O-shaped sealing ring.
Further, the elastic element 7, the push ring, the O-shaped sealing ring and the dry gas sealing atmospheric static ring 25 are sequentially arranged in the dry gas sealing atmospheric static ring seat 16, the floating property of the dry gas sealing atmospheric static ring 25 is regulated through the elastic element 7, and the axial and radial bidirectional static sealing is carried out on the dry gas sealing atmospheric static ring 25 and the dry gas sealing atmospheric static ring seat 16 through the push ring and the O-shaped sealing ring. The dry gas seal atmosphere side static ring seat 16 and the dry gas seal medium side static ring 24 seat are connected into a whole through socket head cap screws. The driving ring and the dry gas seal atmosphere side static ring seat 16 are connected into a whole through the positioning block and the outer hexagon screw, and the dry gas seal rotating piece and the dry gas seal static piece form a container type dry gas seal part at the moment. And the container type dry gas seal with the parking seal structure is fixedly connected with the equipment flange through the screw rod and the outer hexagon nut.
In the embodiment of the utility model, the pressure maintaining and leakage preventing functions are realized. When the lead bismuth pump is in normal operation and stop state, the parking seal is in an open state, namely the end face of the parking movable ring and the end face of the parking seal stationary ring 4 are in a non-contact state. When the lead bismuth pump cavity needs to be vacuumized, pressure maintaining or abnormal failure of dry gas sealing occurs, the parking seal is in a closed state, namely, the end face of the parking movable ring and the end face of the parking seal stationary ring 4 are in a complete contact state, so that external atmosphere is prevented from entering the pump and process media in the pump are prevented from leaking outwards.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and that descriptions of well-known components and processing techniques and procedures are omitted so as not to unnecessarily limit the present utility model.
Claims (10)
1. The non-contact dry gas sealing device for the lead bismuth pump comprises a shaft sleeve (1), a dry gas sealing component and a parking sealing component, wherein the dry gas sealing component and the parking sealing component are arranged on the shaft sleeve (1), the parking sealing component is arranged on one side of a medium, and one end of the elastic component (7) is fixed on one side of the dry gas sealing component medium;
the dry gas sealing component comprises a dry gas sealing medium side static ring seat (13) arranged on one side of a medium, a third sealing ring (2) is arranged between a parking sealing static ring (4) and the dry gas sealing medium side static ring seat (13), the cross section of the parking sealing static ring (4) is in a T shape, the cross section of the parking sealing static ring is composed of a first section (10) and a second section (11), the second section (11) is attached to the shaft sleeve (1), the first section (10) is perpendicular to the second section (11) and is far away from a rotating shaft, the free end of the elastic element (7) protrudes towards the first section (10), the parking sealing static ring seat (5), the parking sealing static ring (4) and the dry gas sealing component form a closed space, the first section (10) is arranged in the closed space, and the closed space is communicated with a parking sealing air inlet (17).
2. A non-contact dry gas sealing device for a lead bismuth pump according to claim 1, wherein the parking seal member comprises a parking seal ring (12) provided on the atmosphere side, the parking seal ring (12) and the pressing sleeve (8) being provided as a common piece.
3. The non-contact dry gas sealing device for the lead bismuth pump according to claim 2, wherein the dry gas sealing component is arranged above a parking sealing component, and the parking sealing movable ring (12) is arranged above the parking sealing stationary ring (4).
4. A non-contact dry gas sealing device for a lead bismuth pump according to claim 3, wherein the parking seal stationary ring (4) adopts an unbalanced structure.
5. The non-contact dry gas sealing device for a lead bismuth pump according to claim 1, wherein the dry gas sealing component comprises a driving ring assembly (14) and an atmosphere side static ring assembly (15), the driving ring assembly (14) is arranged on one atmosphere side, the atmosphere side static ring assembly (15) comprises an atmosphere side static ring seat (16), and the atmosphere side static ring seat (16) and the driving ring assembly (14) form a labyrinth structure.
6. The non-contact dry gas sealing device for the lead-bismuth pump according to claim 1, wherein a parking seal air inlet (17) is arranged on the parking seal part, and a main seal air inlet (18) is arranged on the dry gas seal part.
7. The non-contact dry gas seal device for a lead bismuth pump according to claim 1, wherein the dry gas seal member includes a dry gas seal medium side seal assembly (19) provided on a medium side and a dry gas seal atmosphere side seal assembly (20) provided on an atmosphere side.
8. The non-contact dry gas sealing device for the lead bismuth pump according to claim 7, wherein the dry gas sealing medium side sealing assembly (19) comprises a dry gas sealing medium side moving ring (21), the dry gas sealing atmosphere side sealing assembly (20) comprises a dry gas sealing atmosphere side moving ring (23), and microscopic grooves (22) are formed in the sealing end face of the dry gas sealing medium side moving ring (21) and the sealing end face of the dry gas sealing atmosphere side moving ring (23).
9. The non-contact dry gas sealing device for a lead bismuth pump according to claim 8, wherein the thickness of the gas film formed on the sealing end surface of the dry gas sealing assembly is 2 μm-5 μm.
10. The non-contact dry gas sealing device for the lead bismuth pump according to claim 8, wherein the dry gas sealing medium side moving ring (21) and the dry gas sealing atmosphere side moving ring (23) are made of ceramics; the dry gas sealing medium side sealing assembly (19) comprises a dry gas sealing medium side static ring (24), the dry gas sealing atmosphere side sealing assembly (20) comprises a dry gas sealing atmosphere side static ring (25), and the dry gas sealing medium side static ring (24) and the dry gas sealing atmosphere side static ring (25) are made of graphite.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321203609.XU CN219809164U (en) | 2023-05-18 | 2023-05-18 | Non-contact dry gas sealing device for lead bismuth pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321203609.XU CN219809164U (en) | 2023-05-18 | 2023-05-18 | Non-contact dry gas sealing device for lead bismuth pump |
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| CN219809164U true CN219809164U (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321203609.XU Active CN219809164U (en) | 2023-05-18 | 2023-05-18 | Non-contact dry gas sealing device for lead bismuth pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469370A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
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2023
- 2023-05-18 CN CN202321203609.XU patent/CN219809164U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469370A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
| CN117469370B (en) * | 2023-12-27 | 2024-03-08 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
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