CN110822098A - Shaft seal failure protection structure and application method thereof - Google Patents
Shaft seal failure protection structure and application method thereof Download PDFInfo
- Publication number
- CN110822098A CN110822098A CN201911286296.7A CN201911286296A CN110822098A CN 110822098 A CN110822098 A CN 110822098A CN 201911286296 A CN201911286296 A CN 201911286296A CN 110822098 A CN110822098 A CN 110822098A
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- Prior art keywords
- protective cover
- shaft seal
- cover
- air
- protection
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 98
- 239000007789 gas Substances 0.000 claims abstract description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 6
- 239000001301 oxygen Substances 0.000 abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 description 5
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
-
- 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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention relates to the field of shaft seal, in particular to a shaft seal failure protective structure and a using method thereof, wherein the shaft seal failure protective structure comprises a protective cover; the failed shaft seal is positioned inside the protective cover; the protection cover is connected with a gas supply part for supplying nitrogen gas to the interior of the protection cover. The invention discloses a shaft seal failure protection structure, which can protect a failed shaft seal again by additionally arranging a protection cover structure; in addition, the invention is particularly suitable for the annealing furnace cooling fan, because the annealing furnace cooling fan is used for a long time, the leakage caused by serious seal abrasion often occurs at the sealing part of the fan shaft, but the fan with shaft seal replaced can not be overhauled and disassembled in a short time; the relatively closed space in the protective cover is filled with nitrogen gas higher than the atmospheric pressure, so that positive pressure is formed in the protective cover, and external air is isolated from entering the furnace from the failed shaft seal, so that the stability of the oxygen content in the furnace can be well maintained.
Description
Technical Field
The invention relates to the field of shaft seal, in particular to a shaft seal failure protective structure and a use method thereof,
background
The shaft seal motor side contacts with the outside, and the inside is kept apart internal and external gas by means of a split seal ring. The sealing device is arranged at the fan cover and is fixed.
The dynamic seal of the fan shaft forms positive pressure, so that the aim of preventing external air from entering the furnace is fulfilled (the inside of the fan cover is directly communicated with the annealing furnace).
However, in the long-term and continuous operation process of the fan, abrasion gradually exists at the contact position of the fan shaft sleeve and the sealing ring, so that the gap is too large, and the outside air is sucked into the furnace through the gap after the sealing fails.
Direct impact:
the oxygen content in the annealing furnace is high, the maximum oxygen content reaches over 1000ppm, which is far away from the upper limit value of 30ppm required by the process, and the requirement of normal production cannot be met.
Indirect influence:
the oxygen content of high concentration leads to belted steel can't carry out surface oxidation reduction in the stove, causes the continuous annealing board face colour to turn dark, and galvanized sheet zinc layer adhesive force descends, brings serious influence to the normal production of board strip product, and not only product quality can't satisfy the requirement, can cause the delivery date to delay moreover, causes harmful effects to the reputation of board strip manufacturing enterprise.
Meanwhile, leakage is caused to the serious abrasion of the fan seal, the fan with the shaft seal replaced cannot be overhauled in a short period, the shaft seal is required to be treated, and the exchange of internal and external gases at the cooling fan of the annealing furnace is avoided.
Disclosure of Invention
The present invention aims to overcome the disadvantages of the prior art and to provide a protective structure which has a protective effect when a shaft seal fails.
In order to achieve the purpose, the invention adopts the technical scheme that
A shaft seal failure protection structure comprises a protection cover; the failed shaft seal is positioned inside the protective cover; the protection cover is connected with a gas supply part for supplying nitrogen gas to the interior of the protection cover.
The protective cover is provided with a gas supply pipeline for supplying gas, and the gas supply pipeline is communicated with the gas supply part; and a gas one-way valve is arranged in the gas supply pipeline.
The gas supply pipeline comprises a pipeline body, a gas supply channel is arranged on the pipeline body, and the gas supply channel is in an inverted frustum shape; the opening of one end of the air supply channel close to the interior of the protective cover is smaller.
The protective cover comprises an inner protective cover and an outer protective cover, and the inner protective cover is arranged inside the outer protective cover; a first sealed cavity is formed inside the inner-layer protective cover, and a second sealed cavity is formed between the outer-layer protective cover and the inner-layer protective cover; after the nitrogen is filled, the internal pressure of the second sealing cavity is greater than the internal pressure of the first sealing cavity; the pressure inside the first sealing cavity is higher than the external atmospheric pressure.
The gas supply pipeline is connected with a main pipeline for supplying gas to the second sealed cavity and a branch pipeline for supplying gas to the first sealed cavity; the main pipeline and the branch pipeline are provided with air inlet regulating valves; and a pressure gauge for measuring air pressure is arranged on the outer-layer protective cover.
The outer layer protective cover and the inner layer protective cover are formed by assembling two semicircular cover bodies.
And the inner layer protective cover are both provided with exhaust pipelines.
The use method of the cooling fan shaft seal failure effect protection structure is characterized by comprising the following steps:
(1) firstly, determining the position and the size of a failed shaft seal;
(2) respectively manufacturing an inner layer protective cover and an outer layer protective cover according to the shaft seal size;
(3) after the inner protection cover and the outer protection cover are manufactured, the inner protection cover is installed on the outer side of the shaft seal, then the outer protection cover is installed on the outer side of the inner protection cover, and the protection cover and the peripheral structure are sealed;
(4) respectively supplying nitrogen into the inner-layer protective cover and the outer-layer protective cover, wherein the amount of the continuously supplied nitrogen reaches a set value; thus, the method is completed.
And (4) supplying gas to the inner-layer protective cover in the gas supply sequence of the step (4) and supplying gas to the outer-layer protective cover.
Before the step (4), an exhaust operation is needed, the inner protective cover is supplied with air firstly to discharge the air in the inner protective cover, then the outer protective cover is supplied with air, so that the air in the area between the outer protective cover and the inner protective cover is discharged, and the air is reduced to the greatest extent and enters the annealing furnace through the shaft sealing position.
The invention has the advantages that:
the invention discloses a shaft seal failure protection structure, which can protect failed shaft seals again by additionally arranging a protection cover structure and has good use significance; in addition, the invention is particularly suitable for the annealing furnace cooling fan, because the annealing furnace cooling fan is used for a long time, the leakage caused by serious seal abrasion often occurs at the sealing part of the fan shaft, but the fan with shaft seal replaced can not be overhauled and disassembled in a short time; therefore, the protection structure disclosed by the invention is needed, and by adopting the protection structure disclosed by the invention, the relatively closed space inside the protection cover is filled with nitrogen gas higher than the atmospheric pressure, so that positive pressure is formed inside the protection cover, and external air is isolated from entering the furnace from the failed shaft seal, so that the stability of the oxygen content in the furnace can be well maintained.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side view of the outer shield of the present invention.
Fig. 3 is a partially enlarged view of the area a in fig. 1.
The labels in the above figures are:
1. protective cover, 2, shaft seal, 3, fan axle.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
A shaft seal failure protection structure comprises a protection cover 1; the failed shaft seal 2 is inside the protective cover 1; the protective cover 1 is connected with a gas supply part for supplying nitrogen gas to the interior of the protective cover 1; the invention discloses a protective structure for shaft seal 2 failure, which can protect the failed shaft seal 2 again by adding a protective cover 1 structure and has good use significance; in addition, the invention is particularly suitable for the annealing furnace cooling fan, because the annealing furnace cooling fan is used for a long time, the leakage caused by serious seal abrasion often appears at the fan shaft seal 2, but the fan with shaft seal replacement can not be dismantled and maintained in a short time; therefore, the protection structure disclosed by the invention is adopted, and the relatively closed space in the protection cover 1 is filled with nitrogen gas higher than the atmospheric pressure to form positive pressure in the protection cover so as to isolate external air from entering the furnace from the failed shaft seal 2, so that the stability of the oxygen content in the furnace can be well maintained; the gas supply means herein may employ gas supply technology such as a conventional air pump or the like as long as the nitrogen gas delivery is achieved and can be connected to the gas supply line 1-1 hereinafter.
The protective cover is fixedly arranged, the protective cover is sleeved on the fan shaft, the side face of the protective cover is connected with the fan cover in a specified mode, and the fan cover is not drawn on a drawing because the invention of the application is not in the connection mode of the protective cover.
Preferably, an air supply pipeline 1-1 for supplying air is arranged on the protective cover 1, and the air supply pipeline 1-1 is communicated with an air supply part; a gas one-way valve 1-2 is arranged in the gas supply pipeline 1-1; the setting of the one-way valve avoids gas from overflowing from the gas supply pipeline 1-1, and in addition, as a larger optimization, the gas supply pipeline 1-1 can be provided with a control valve which can be selected automatically or manually and can be specifically set according to needs.
Preferably, the gas supply pipeline 1-1 comprises a pipeline body 1-11, a gas supply channel 1-12 is arranged on the pipeline body 1-11, and the gas supply channel 1-12 is in an inverted frustum shape; one end of the gas supply channel 1-12 close to the interior of the protective cover 1 is provided with a small opening; this arrangement provides a difference in area of the gas supply channels 1-12, which, when nitrogen enters the interior of the shield 1 from the gas supply channels 1-12, increases the flow rate of nitrogen entering the shield 1 from the gas supply channels 1-12, because the openings of the gas supply channels 1-12 near the end of the shield 1 are smaller, which is more favorable for the diffusion of nitrogen within the shield 1.
Preferably, the protective cover 1 of the present invention comprises an inner protective cover 12 and an outer protective cover 11, wherein the inner protective cover 12 is disposed inside the outer protective cover 11; a first sealed cavity is formed inside the inner protective cover 12, and a second sealed cavity is formed between the outer protective cover 11 and the inner protective cover 12; the arrangement of the inner and outer protective covers 11 ensures that the failed shaft seal 2 has double-layer protection; in addition, after the nitrogen is filled, the internal pressure of the second sealing cavity is required to be greater than the internal pressure of the first sealing cavity; the pressure inside the first sealing cavity is higher than the external atmospheric pressure; due to the arrangement, even if leakage occurs at the edge of the protective cover 1, the inner protective cover 12 can be ensured not to enter air at the first time due to the movement of pressure intensity, and the problem that the air enters the annealing furnace from the shaft seal 2 is basically avoided; in addition, the inner protective cover 12 and the outer protective cover are connected through connecting columns 1-5, the connecting columns 1-5 can be connected in a welding mode and the like, and the connecting columns can be specifically arranged according to requirements.
Preferably, the air supply pipeline 1-1 is connected with a main branch pipeline 121 for supplying air to the second sealed cavity and a branch pipeline 111 for supplying air to the first sealed cavity; the main pipeline 121 and the branch pipeline 111 are both provided with an air inlet regulating valve 113; the main pipeline 121 and the branch pipeline 111 are arranged, so that the connection between the inner-layer protective cover 12 and the outer-layer protective cover 11 is facilitated, and the main pipeline 121, the branch pipeline 111 and the gas supply pipeline 1-1 can be connected with each other in a welding or other fixing mode; for greater optimization, the outer protective cover 11 is provided with a pressure gauge 1-4 for measuring air pressure; the pressure gauge 1-4 is used for detecting the air pressure in the area between the outer protection cover 11 and the inner protection cover 1, and as a larger optimization, the pressure gauge can be matched with a control system and can be used for reminding an operator of the pressure change between the outer protection cover 11 and the inner protection cover 12.
Preferably, the outer protective cover 11 and the inner protective cover 12 are formed by assembling two semicircular cover bodies; the design mode facilitates the production and assembly of the outer protection cover 11 and the inner protection cover 12, and meanwhile, the integral structures of the outer protection cover 11 and the inner protection cover 12 are similar and only have differences from pipelines, and the difference between the two covers is the difference in size; meanwhile, no matter the outer-layer protective cover 11 or the inner-layer protective cover 12 is adopted, the main body is formed by assembling two semicircular cover bodies, the assembling can be carried out by adopting a bolt to match with a sealing gasket, the assembling can be specifically arranged according to the requirement, meanwhile, the design of the cover bodies cannot interfere with the fan shaft 3 and other parts, and therefore, certain areas of the cover bodies need to be additionally provided with avoidance holes and the like, and the avoidance holes belong to the known technology and are not described herein.
Preferably, the inner protection cover 12 and the inner protection cover 12 are both provided with exhaust pipelines 1-3; the arrangement of the exhaust pipelines 1-3 can facilitate the exhaust of the gas in the first sealing cavity and the second sealing cavity; the exhaust pipeline 1-3 is also provided with a one-way valve 1-31, so as to ensure that air in the second sealing cavity cannot enter the first sealing cavity when the second sealing cavity is exhausted.
The use method of the protective structure for the failure of the seal 2 of the cooling fan shaft 3 is characterized by comprising the following steps:
(1) first determining the location and size of the failed shaft seal 2;
(2) respectively manufacturing an inner layer protective cover 12 and an outer layer protective cover 11 according to the size of the shaft seal 2;
(3) after the inner protection cover 12 and the outer protection cover 11 are manufactured, the inner protection cover 12 is firstly installed on the outer side of the shaft seal 2, then the outer protection cover 11 is installed on the outer side of the inner protection cover 12, and the protection cover 1 is ensured to be sealed with the peripheral structure;
(4) respectively supplying nitrogen into the inner-layer protective cover 12 and the outer-layer protective cover 11, wherein the amount of the continuously supplied nitrogen reaches a set value; thus, the method is completed.
As a greater optimization, in the present invention, the air supply sequence of step (4) is to supply air to the inner protective cover 12 first and to supply air to the outer protective cover 11; complete evacuation of the air from the inner shield 12 can be ensured; ensuring the purity of the gas in the inner shield 12.
As a greater optimization, before the step (4), an exhaust operation is required to be added, air is firstly supplied to the inner shield 12 to exhaust the air inside the inner shield, and then the outer shield 11 is supplied, so that the air in the area between the outer shield 11 and the inner shield 12 is exhausted, and the air entering the annealing furnace through the shaft seal 2 is reduced to the greatest extent.
In addition, after actual installation, need be to carry out sealing treatment to 1 edge of protection casing, the sealing measure such as rubber pad, sealed mud is used commonly, specifically sets up according to actual need, and the main objective reduces unnecessary nitrogen gas consumption and ensures sealed effect.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. A shaft seal failure protection structure is characterized by comprising a protection cover; the failed shaft seal is positioned inside the protective cover; the protection cover is connected with a gas supply part for supplying nitrogen gas to the interior of the protection cover.
2. The shaft seal failure protection structure according to claim 1, wherein a gas supply pipeline for supplying gas is arranged on the protection cover, and the gas supply pipeline is communicated with a gas supply part; and a gas one-way valve is arranged in the gas supply pipeline.
3. The shaft seal failure protection structure according to claim 2, wherein the gas supply duct comprises a duct body, a gas supply channel is arranged on the duct body, and the gas supply channel is in an inverted frustum shape; the opening of one end of the air supply channel close to the interior of the protective cover is smaller.
4. The shaft seal defeat protective structure of claim 1, wherein said shield comprises an inner shield and an outer shield, the inner shield being disposed inside the outer shield; a first sealed cavity is formed inside the inner-layer protective cover, and a second sealed cavity is formed between the outer-layer protective cover and the inner-layer protective cover; after the nitrogen is filled, the internal pressure of the second sealing cavity is greater than the internal pressure of the first sealing cavity; the pressure inside the first sealing cavity is higher than the external atmospheric pressure.
5. The shaft seal failure protection structure according to claim 4, wherein a main branch pipeline for supplying air to the second seal cavity and a branch pipeline for supplying air to the first seal cavity are connected to the air supply pipeline; the main pipeline and the branch pipeline are provided with air inlet regulating valves; and a pressure gauge for measuring air pressure is arranged on the outer-layer protective cover.
6. The shaft seal failure protection structure of claim 4, wherein the outer shield and the inner shield are assembled from two semicircular shields.
7. The shaft seal defeat protective structure of claim 4, wherein an exhaust duct is provided in both the inner protective cover and the inner protective cover.
8. Use of a protective structure against failure of a shaft seal of a cooling fan according to any of claims 1 to 7, characterized in that it comprises the following steps:
(1) firstly, determining the position and the size of a failed shaft seal;
(2) respectively manufacturing an inner layer protective cover and an outer layer protective cover according to the shaft seal size;
(3) after the inner protection cover and the outer protection cover are manufactured, the inner protection cover is installed on the outer side of the shaft seal, then the outer protection cover is installed on the outer side of the inner protection cover, and the protection cover and the peripheral structure are sealed;
(4) respectively supplying nitrogen into the inner-layer protective cover and the outer-layer protective cover, wherein the amount of the continuously supplied nitrogen reaches a set value; thus, the method is completed.
9. The method for using the protective structure for the shaft seal failure of the cooling fan as claimed in claim 1, wherein the air supply sequence of the step (4) is that air is firstly supplied to the inner protective cover and then air is supplied to the outer protective cover.
10. The method for using the protective structure for the shaft seal failure of the cooling fan as claimed in claim 1, wherein before the step (4), an additional air exhausting operation is required, air in the inner protective cover is exhausted by supplying air to the inner protective cover, and then air is supplied to the outer protective cover, so that air in the area between the outer protective cover and the inner protective cover is exhausted, and air is maximally reduced from entering the annealing furnace through the shaft seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911286296.7A CN110822098A (en) | 2019-12-13 | 2019-12-13 | Shaft seal failure protection structure and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911286296.7A CN110822098A (en) | 2019-12-13 | 2019-12-13 | Shaft seal failure protection structure and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110822098A true CN110822098A (en) | 2020-02-21 |
Family
ID=69545504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911286296.7A Pending CN110822098A (en) | 2019-12-13 | 2019-12-13 | Shaft seal failure protection structure and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110822098A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606159A (en) * | 2021-07-02 | 2021-11-05 | 光大环境科技（中国）有限公司 | Fully-sealed fan for flue gas recirculation and sealing monitoring method |
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2019
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| CN2208627Y (en) * | 1994-04-21 | 1995-09-27 | 齐鲁石油化工公司胜利炼油厂 | Gas membrane float-ring oil sealing for air compressor |
| CN2214564Y (en) * | 1995-03-10 | 1995-12-06 | 鞍山钢铁公司 | Dynamic sealing protecting device for fan shaft |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606159A (en) * | 2021-07-02 | 2021-11-05 | 光大环境科技（中国）有限公司 | Fully-sealed fan for flue gas recirculation and sealing monitoring method |
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