CN114540986A - Carbon fiber pre-oxidation furnace with airflow rectification function - Google Patents
Carbon fiber pre-oxidation furnace with airflow rectification function Download PDFInfo
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- CN114540986A CN114540986A CN202210187989.6A CN202210187989A CN114540986A CN 114540986 A CN114540986 A CN 114540986A CN 202210187989 A CN202210187989 A CN 202210187989A CN 114540986 A CN114540986 A CN 114540986A
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
Abstract
The invention relates to the technical field of carbon fiber production equipment, in particular to a carbon fiber pre-oxidation furnace with an airflow rectification function, which comprises: one end of the pre-oxidation chamber is provided with an air inlet, and the other end of the pre-oxidation chamber is provided with an air return inlet; the rectifiers are arranged in the pre-oxidation chamber; each rectifier comprises a rectifying shell, an upper rectifying surface and a lower rectifying surface; the rectifying shell is provided with an air inlet and an air outlet; the upper rectifying surface and the lower rectifying surface are symmetrically arranged at the upper end and the lower end in the rectifying shell; the tows penetrate through the space between the upper rectifying surface and the lower rectifying surface; wherein, the upper rectification surface comprises an upper air inlet surface and an upper air outlet surface; the lower rectification surface comprises a lower air inlet surface and a lower air outlet surface; the interval between the upper air inlet surface and the lower air inlet surface is gradually folded from outside to inside, and the interval between the upper air outlet surface and the lower air outlet surface is gradually folded from outside to inside. The invention provides a carbon fiber pre-oxidation furnace with an airflow rectification function, which effectively reduces the vibration amplitude of carbon fiber tows in the furnace and avoids broken filaments and broken filaments.
Description
Technical Field
The invention relates to the technical field of carbon fiber production equipment, in particular to a carbon fiber pre-oxidation furnace with an airflow rectification function.
Background
The pre-oxidation is an important intermediate process for producing carbon fibers, and plays a role in converting precursor into the carbon fibers, and in the conversion process, linear molecular chains of the precursor are converted into pre-oxidized fibers with a heat-resistant ladder structure; and the carbon fiber is converted into the carbon fiber with a turbostratic graphite structure in a high-temperature carbonization environment. Therefore, this step is very important because it is closely related to the performance of the carbon fiber.
The carbon fiber tows are easy to have broken filaments and broken filaments in the pre-oxidation stage, one of the main reasons is that the air flow in the furnace is more prone to generate disorder as the air flow flows backwards under the influence of parts and tows in the furnace, and the tows form vibration under the blowing of the disorder air flow, so that friction is generated between the tows and the wall surface of the parts in the furnace, and accordingly the broken filaments or broken filaments are caused.
In view of the above problems, the designer designs a carbon fiber pre-oxidation furnace with airflow rectification function based on practical experience and professional knowledge which are abundant for years in engineering application of such products and by cooperating with the application of theory, so as to effectively reduce the vibration amplitude of carbon fiber tows in the furnace and avoid broken filaments and broken filaments.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a carbon fiber pre-oxidation furnace with an airflow rectification function aiming at the defects in the prior art, and solves the problems that the carbon fiber tows vibrate and rub in the furnace and are easy to generate broken filaments or broken filaments due to unstable airflow in the prior pre-oxidation furnace.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method comprises the following steps: the pre-oxidation chamber is provided with an air inlet at one end and an air return inlet at the other end, and airflow enters from the air inlet and flows to the air return inlet; the tows pass through the pre-oxidation chamber along the length direction of the pre-oxidation chamber;
a plurality of rectifiers disposed within the pre-oxidation chamber; each rectifier comprises a rectifying shell, an upper rectifying surface and a lower rectifying surface; one side of the rectifying shell facing the air inlet and the air return inlet is respectively provided with an air inlet and an air outlet; the upper rectifying surface and the lower rectifying surface are symmetrically arranged at the upper end and the lower end in the rectifying shell; the tows pass between the upper and lower fairing surfaces;
the upper rectifying surface comprises an upper air inlet surface close to the air inlet and an upper air outlet surface close to the air outlet; the lower rectifying surface comprises a lower air inlet surface close to the air inlet and a lower air outlet surface close to the air outlet; the interval between the upper air inlet surface and the lower air inlet surface gradually converges from outside to inside, and the interval between the upper air outlet surface and the lower air outlet surface gradually converges from outside to inside.
Furthermore, the plurality of rectifiers are respectively arranged at the middle section which is close to the air inlet, the interval between the air inlet and the air return inlet and the air outlet, and are respectively determined as an upwind position rectifier, a middle rectifier and a downwind position rectifier.
Further, in the upper air position rectifier, the length of the upper air inlet surface in the extension direction of the tows is smaller than that of the upper air outlet surface in the extension direction of the tows.
Further, in the middle rectifier, the length of the upper air inlet surface in the extension direction of the tows is equal to the length of the upper air outlet surface in the extension direction of the tows.
Furthermore, in the middle rectifier, the upper rectifying surface and the lower rectifying surface are both elastic structures, an air supplementing port is arranged on the end face of the middle rectifier, and air flow enters from the air supplementing port and jacks up the upper rectifying surface and the lower rectifying surface.
Further, in the lower wind position rectifier, the length of the upper wind inlet surface in the extension direction of the tows is larger than that of the upper wind outlet surface in the extension direction of the tows.
Further, the upper rectification surface and the lower rectification surface are symmetrically arranged on two sides of the extension direction of the tows.
Further, the upper rectifying surface and the lower rectifying surface are both curved surface structures.
Further, each rectifier independently slides in the pre-oxidation chamber along the extension direction of the tows.
Furthermore, in the pre-oxidation chamber, a fresh air duct is arranged on the outer sides of the air return opening and the air inlet opening, and an air curtain is arranged on one side of the fresh air duct facing to the outer side.
Through the technical scheme of the invention, the following technical effects can be realized:
the carbon fiber pre-oxidation furnace with the airflow rectification function can quickly and effectively rectify the airflow in the furnace; if the carbon fiber vibrates, the vibration amplitude of the carbon fiber in the oxidation furnace can be accurately reduced through the rectifier, and the occurrence probability of broken fibers and broken fibers in the oxidation furnace is reduced; the rectifier has little influence on the main stream of the circulating air in the oxidation furnace, and the operation stability and the safety of the oxidation furnace are effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a top view of a carbon fiber pre-oxidation furnace with a flow straightening function according to an embodiment of the present invention;
FIG. 2 is a side view of a carbon fiber pre-oxidation furnace having a flow straightening function according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of an upwind rectifier according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the inflated state of the center rectifier in an embodiment of the present invention;
FIG. 5 is a sectional view of the structure of the middle rectifier in the deflated state in the embodiment of the present invention;
FIG. 6 is a cross-sectional view of a lower wind level rectifier in accordance with an embodiment of the present invention;
reference numerals: the air inlet 1, the air return inlet 2, the rectifier 3, the rectifying shell 31, the air inlet 311, the air outlet 312, the upper rectifying surface 32, the upper air inlet surface 321, the upper air outlet surface 322, the lower rectifying surface 33, the lower air inlet surface 331, the lower air outlet surface 332, the air supplementing port 34, the upper air level rectifier 3a, the middle rectifier 3b, the lower air level rectifier 3c, the fresh air duct 4 and the air curtain 5.
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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or 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.
A carbon fiber pre-oxidation furnace with airflow rectification function, as shown in figures 1-6, comprises:
the system comprises a pre-oxidation chamber, a gas inlet 1 is arranged at one end of the pre-oxidation chamber, a return air inlet 2 is arranged at the other end of the pre-oxidation chamber, gas flow enters from the gas inlet 1 and flows to the return air inlet 2, the gas flow flows back to the gas inlet 1 from the return air inlet 2 at the outer side of the pre-oxidation chamber, and the gas flow is heated in the process of flowing back to the gas inlet 1, so that the circulation of the gas flow is realized, the specific structures for realizing the circulation and the heating of the gas flow are the prior art, and the detailed description is omitted; the tows penetrate through the pre-oxidation chamber along the length direction of the pre-oxidation chamber; therefore, the arrangement direction of the tows in the pre-oxidation chamber is parallel to the direction of the air flow, and a better pre-oxidation effect can be obtained;
a plurality of rectifiers 3 arranged in the pre-oxidation chamber; each rectifier 3 comprises a rectifying shell 31, an upper rectifying surface 32 and a lower rectifying surface 33; one side of the rectifying shell 31 facing the air inlet 1 and the air return 2 is respectively provided with an air inlet 311 and an air outlet 312; the upper rectifying surface 32 and the lower rectifying surface 33 are symmetrically arranged at the upper end and the lower end in the rectifying shell 31; the tows pass between the upper fairing surface 32 and the lower fairing surface 33;
the upper rectifying surface 32 includes an upper air inlet surface 321 close to the air inlet 311 and an upper air outlet surface 322 close to the air outlet 312; the lower rectifying surface 33 comprises a lower air inlet surface 331 close to the air inlet 311 and a lower air outlet surface 332 close to the air outlet 312; the interval between the upper air inlet surface 321 and the lower air inlet surface 331 gradually converges from the outside to the inside, and the interval between the upper air outlet surface 322 and the lower air outlet surface 332 gradually converges from the outside to the inside.
Specifically, the airflow in the pre-oxidation chamber enters the rectifier 3 from the air inlet 1, then the airflow is concentrated under the action of the upper air inlet surface 321 and the lower air inlet surface 331, the tows pass through the rectifier 3, therefore, when the airflow is concentrated and flows, the airflow above the tows is deflected downwards, so that a downward thrust is generated on the tows, the airflow below the tows is deflected upwards, so that an upward thrust is generated on the tows, the tows are not easy to vibrate under the action of the upper thrust and the lower thrust, the upper rectifying surface 32 and the lower rectifying surface 33 are preferably symmetrically arranged on two sides of the extending direction of the tows, so that the intervals between the upper rectifying surface 32 and the lower rectifying surface 33 and the tows are the same, the upper thrust and the lower thrust on the tows can be kept consistent as much as possible in terms of values, the tows can reach a force balance state, and further no vibration is generated, the friction of the tows caused by vibration is avoided, so that the probability of broken filaments and broken filaments in the oxidation furnace is reduced. And then the concentrated airflow is dispersed through the interval between the upper air outlet surface 322 and the lower air outlet surface 332 which is gradually increased from inside to outside, so that the airflow returns to the state before entering the rectifier 3, the influence on the main flow of the circulating air in the oxidation furnace is avoided as much as possible, and the operation stability and the safety of the oxidation furnace are improved.
Because the airflow states of various parts in the furnace have certain differences, the plurality of rectifiers 3 are respectively arranged at the positions close to the air inlet 1, the middle sections at intervals of the air inlet 1 and the air return 2 and the positions close to the air outlet 312 and are respectively defined as an upwind level rectifier 3a, a middle rectifier 3b and a downwind level rectifier 3c, and the rectifiers 3 at each part need to be designed independently according to the airflow states of corresponding parts in the furnace.
Because the upwind level rectifier 3a is close to the air inlet 1, the air inlet 1 is usually provided with a fixed distributor, which can guide the air flow uniformly into the furnace, so that the air flow entering the upwind level rectifier 3a is not too turbulent as shown in fig. 3, but the tow at this place is firstly contacted with the air flow, and the air flow has a sudden change in the force applied to the tow by the air flow, so that the vibration is easily generated at this place, and if the vibration is generated, the air flow at the upwind level and the whole tow are affected, and the vibration must be rapidly reduced at this place, therefore, in the upwind level rectifier 3a, the length of the upwind inlet face 321 in the direction of the tow extension is set to be smaller than the length of the upwind outlet face 322 in the direction of the tow extension, corresponding to the length of the downwind inlet face 331 in the direction of the tow extension is also smaller than the length of the downwind outlet face 332 in the direction of the tow extension, the structure ensures that the structure of concentrated airflow formed by the upper air inlet surface 321 and the lower air inlet surface 331 is shorter, and the consistency of the entering airflow is better, so that the airflow can be quickly concentrated, and the vibration of tows can be quickly reduced; meanwhile, the structure enables the structure of the dispersed airflow formed by the upper air outlet surface 322 and the lower air outlet surface 332 to be longer, because the airflow flows for a longer distance behind the upper air level rectifier 3a, the airflow can be uniformly dispersed by the longer path as much as possible, and the interference to the backward airflow is reduced.
In the middle position in the furnace, the tows at the position are far away from the power rollers at both sides, so that the supporting force is the smallest, vibration is easy to generate, and therefore the middle rectifier 3b is arranged at the position for vibration reduction, in the middle rectifier 3b, the length of the upper air inlet surface 321 in the extending direction of the tows is set to be equal to the length of the upper air outlet surface 322 in the extending direction of the tows, and the length of the corresponding lower air inlet surface 331 in the extending direction of the tows is also equal to the length of the lower air outlet surface 332 in the extending direction of the tows, so that the lengths of the structures for concentrating air flow and the structures for dispersing air flow are the same, and the influence on the air flow is minimized. Preferably, in the middle rectifier 3b, the upper rectifying surface 32 and the lower rectifying surface 33 are both elastic structures, an air supplement port 34 is arranged on the end surface of the middle rectifier 3b, and when rectification is required, as shown in fig. 4, high-pressure gas enters from the air supplement port 34 and jacks up the upper rectifying surface 32 and the lower rectifying surface 33, so that a rectification function is realized; when rectification is not required, as shown in fig. 5, high-pressure gas inside the rectifier 3 is discharged from the gas supply port 34, and the elastic upper rectifying surface 32 and the elastic lower rectifying surface 33 are in contact with the rectifying case 31 by the elastic force, thereby reducing interference with the gas flow.
At a position close to the air return opening 2, because the air flow is at the position of the lower air opening of the air flow, as shown in fig. 6, the air flow is relatively turbulent after blowing through the tows and a large distance in the furnace, and the tows at the position are also easily vibrated by the influence of the turbulent air flow, a lower air position rectifier 3c is arranged to reduce the vibration of the tows at the position, and in the lower air position rectifier 3c, the length of an upper air inlet surface 321 in the extension direction of the tows is set to be greater than that of an upper air outlet surface 322 in the extension direction of the tows, and correspondingly, the length of a lower air inlet surface 331 in the extension direction of the tows is also greater than that of a lower air outlet surface 332 in the extension direction of the tows, so that the structure of the concentrated air flow is longer, the air flow which is more turbulent can be collected, and the turbulent air flow can be gradually guided, and finally the air flow can be uniformly concentrated together to realize the vibration damping function; the rear of the lower air level rectifier 3c is close to the return air inlet 2, and the air flow can be rapidly collected, so that the structure for dispersing the air flow can be set to be shorter, and a space is reserved for the structure for concentrating the air flow as far as possible.
Go up fairing 32 and lower fairing 33 and all preferably set up to the curved surface structure to guarantee that the air current is at concentrating, the ground in-process is more gentle dispersedly, avoid the edges and corners to produce the influence to the air current.
Preferably, each rectifier 3 is independently arranged to slide in the pre-oxidation chamber along the extension direction of the tows, so that the position of each rectifier 3 is adjusted to a certain extent, and thus the rectifiers 3 can be adjusted to the place where the tows vibrate most according to different vibration conditions of each tow, and the vibration reduction effect on the tows is increased.
In the pre-oxidation chamber, a fresh air duct 4 is arranged at the outer sides of the air return opening 2 and the air inlet opening 1, and the fresh air duct 4 is used for supplementing a certain air flow into the circulating air flow and preventing the air flow in the pre-oxidation chamber from leaking; and an air curtain 5 is arranged on one side of the fresh air duct 4 facing to the outside and used for preventing external impurities from entering the air flow of the fresh air duct 4.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A carbon fiber pre-oxidation furnace with airflow rectification function is characterized by comprising a furnace body;
one end of the pre-oxidation chamber is provided with an air inlet (1), the other end of the pre-oxidation chamber is provided with an air return inlet (2), and air flow enters from the air inlet (1) and flows to the air return inlet (2); the tows pass through the pre-oxidation chamber along the length direction of the pre-oxidation chamber;
a plurality of rectifiers (3) arranged in the pre-oxidation chamber; each rectifier (3) comprises a rectifying shell (31), an upper rectifying surface (32) and a lower rectifying surface (33); an air inlet (311) and an air outlet (312) are respectively formed in one side, facing the air inlet (1) and the air return inlet (2), of the rectifying shell (31); the upper rectifying surface (32) and the lower rectifying surface (33) are symmetrically arranged at the upper end and the lower end in the rectifying shell (31); the tows pass between the upper and lower rectification surfaces (32, 33);
the upper rectifying surface (32) comprises an upper air inlet surface (321) close to the air inlet (311) and an upper air outlet surface (322) close to the air outlet (312); the lower rectifying surface (33) comprises a lower air inlet surface (331) close to the air inlet (311) and a lower air outlet surface (332) close to the air outlet (312); the interval between the upper air inlet surface (321) and the lower air inlet surface (331) gradually converges from outside to inside, and the interval between the upper air outlet surface (322) and the lower air outlet surface (332) gradually converges from outside to inside.
2. The carbon fiber pre-oxidation furnace with airflow rectification function according to claim 1, wherein a plurality of rectifiers (3) are respectively arranged at a position close to the air inlet (1), a middle section of the air inlet (1) and the air return (2) and a position close to the air outlet (312), and are respectively defined as an upwind rectifier (3 a), a middle rectifier (3 b) and a downwind rectifier (3 c).
3. The carbon fiber preoxidation furnace with airflow rectification function according to claim 2 characterized in that in the upwind position rectifier (3 a), the length of the upwind inlet surface (321) in the extending direction of the tows is smaller than the length of the upwind outlet surface (322) in the extending direction of the tows.
4. The carbon fiber pre-oxidation furnace with the airflow rectification function according to claim 2, wherein in the middle rectifier (3 b), the length of the upper air inlet surface (321) in the extending direction of the tows is equal to the length of the upper air outlet surface (322) in the extending direction of the tows.
5. The carbon fiber pre-oxidation furnace with the gas flow rectification function according to claim 4, wherein in the middle rectifier (3 b), the upper rectification surface (32) and the lower rectification surface (33) are both of an elastic structure, an air supplement port (34) is arranged on the end surface of the middle rectifier (3 b), and high-pressure gas enters from the air supplement port (34) and jacks up the upper rectification surface (32) and the lower rectification surface (33).
6. The carbon fiber pre-oxidation furnace with the airflow rectification function according to claim 2, wherein in the lower air level rectifier (3 c), the length of the upper air inlet surface (321) in the extending direction of the tows is larger than the length of the upper air outlet surface (322) in the extending direction of the tows.
7. The carbon fiber pre-oxidation furnace with the airflow rectification function according to any one of claims 1 to 6, wherein the upper rectification surface (32) and the lower rectification surface (33) are symmetrically arranged on both sides in the extending direction of the tows.
8. The carbon fiber preoxidation furnace with airflow straightening function according to any one of claims 1 to 6, characterized in that the upper straightening surface (32) and the lower straightening surface (33) are both curved structures.
9. The carbon fiber pre-oxidation oven with the airflow rectification function according to claim 1, characterized in that each rectifier (3) independently slides in the pre-oxidation chamber along the extension direction of the tows.
10. The carbon fiber pre-oxidation furnace with the airflow rectification function according to claim 1, wherein a fresh air duct (4) is arranged outside the air return opening (2) and the air inlet opening (1) in the pre-oxidation chamber, and an air curtain (5) is arranged on one side of the fresh air duct (4) facing to the outside.
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| CN202210187989.6A CN114540986B (en) | 2022-02-28 | 2022-02-28 | Carbon fiber pre-oxidation furnace with airflow rectification function |
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| CN212128362U (en) * | 2020-02-25 | 2020-12-11 | 广州赛奥碳纤维技术有限公司 | Double-parallel efficient pre-oxidation furnace |
| CN212335378U (en) * | 2020-05-12 | 2021-01-12 | 天华化工机械及自动化研究设计院有限公司 | Carbon fiber oxidation furnace |
| EP3859060A1 (en) * | 2018-09-28 | 2021-08-04 | Toray Industries, Inc. | Method of manufacturing stabilized fiber bundle, and method of manufacturing carbon fiber bundle |
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2022
- 2022-02-28 CN CN202210187989.6A patent/CN114540986B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103352274A (en) * | 2013-06-25 | 2013-10-16 | 合肥日新高温技术有限公司 | Pre-oxidization furnace airflow purification and rectification device |
| CN206109616U (en) * | 2016-08-30 | 2017-04-19 | 赵飘然 | Preoxidation furnace |
| EP3859060A1 (en) * | 2018-09-28 | 2021-08-04 | Toray Industries, Inc. | Method of manufacturing stabilized fiber bundle, and method of manufacturing carbon fiber bundle |
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