Shaft seal failure protection structure and application method thereof
阅读说明:本技术 一种轴密封失效用防护结构及其使用方法 (Shaft seal failure protection structure and application method thereof ) 是由 汪红兵 苗斌 许翔 周晟 王辉 于 2019-12-13 设计创作,主要内容包括:本发明涉及轴密封领域,具体来说是一种轴密封失效用防护结构及其使用方法,包括防护罩;失效的轴密封处于防护罩内部;所述防护罩连接有用于为防护罩内部供给氮气的供气部件。本发明公开了一种轴密封失效用防护结构,通过增设防护罩结构,可以对已失效的轴密封进行再次防护;另外,本发明特别适用于退火炉冷却风机,因为退火炉冷却风机长时间使用,风机轴密封处常出现密封磨损严重已经导致泄露,但是短期内无法进行开炉检修拆卸更换轴封的风机;通过对防护罩内部相对密闭空间充入高于大气压的氮气,使其内部形成正压,以此隔绝外界空气从失效的轴密封进入炉内,从而可以很好的维持炉内氧含量的稳定。(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.)
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.
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
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
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
Preferably, the
Preferably, the air supply pipeline 1-1 is connected with a
Preferably, the outer
Preferably, the
The use method of the protective structure for the failure of the
(1) first determining the location and size of the failed
(2) respectively manufacturing an inner layer
(3) after the
(4) respectively supplying nitrogen into the inner-layer
As a greater optimization, in the present invention, the air supply sequence of step (4) is to supply air to the inner
As a greater optimization, before the step (4), an exhaust operation is required to be added, air is firstly supplied to the
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.
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