CN116045675A - A return air chamber and pre-oxidation stove for filter screen is changed - Google Patents

Abstract

The invention relates to a return air cavity for replacing a filter screen and a pre-oxidation furnace, wherein the return air cavity comprises: the device comprises an unreeling mechanism (10), an unreeling sealing shell (20), a reeling mechanism (30), a reeling sealing shell (40) and a return air cavity (60); the winding mechanism (30) is accommodated in the winding sealing shell (40), and the unwinding mechanism (10) is accommodated in the unwinding sealing shell (20); meanwhile, the rolling sealing shell (40) and the unreeling sealing shell (20) are respectively arranged at two sides of the air return cavity (60); when the winding structure winds the return air filter screen (50) which needs to be replaced, the unreeling mechanism (10) unreels the temporary-stored return air filter screen (50) which needs to be replaced under the driving of the winding mechanism (30), so that the replacement of the return air filter screen (50) in the return air cavity (60) is realized. Through improvement and design to return air chamber structure, can improve the change efficiency of return air filter screen, can also guarantee simultaneously that the return air filter screen is not destroyed the stability and the homogeneity of temperature of circulation air flow field in receipts, unreeling in-process.

Description

A return air chamber and pre-oxidation stove for filter screen is changed

Technical Field

The invention relates to the field of carbon fiber production, in particular to a return air cavity for filter screen replacement and a pre-oxidation furnace.

Background

The carbon fiber is fibrous carbon material with carbon content over 90% and is produced through carbonizing various organic fibers in inert gas at high temperature. With the increasing maturity of carbon fiber manufacturing technology, today, a carbon fiber manufacturing process mostly includes two steps, a first step of manufacturing fiber precursors, and a second step of performing pre-oxidation and carbonization treatment on the fiber precursors. The pre-oxidation treatment aims to convert the linear molecular chains of the fiber precursor into a heat-resistant trapezoid structure, so that the fiber precursor is not melted and not burnt during high-temperature carbonization, and the fiber state is maintained.

Meanwhile, a pre-oxidation furnace is generally used for the pre-oxidation treatment of the carbon fibers. In the current carbon fiber generation and manufacturing field, the pre-oxidation furnaces are divided into a cross-flow type, a horizontal flow type and a forward flow type. Wherein, a tow channel is arranged in the horizontal flow type carbon fiber pre-oxidation furnace, an air inlet cavity and an air return cavity are respectively arranged at two ends of the tow channel, an internal flow field enters the tow channel through the air inlet cavity after being heated, and then the yarn bundle passes through the yarn bundle channel to reach the return air cavity, and the return air cavity circulates under the negative pressure formed by the circulating fan and flows to the air inlet cavity after being heated, so that the flow field circulation is formed. And carbon fiber is easy to produce the broken filament in the preoxidation process, can influence subsequent carbon fiber's preoxidation at cyclic process, so be provided with the return air filter screen in the position of return air chamber to collect the broken filament of preoxidation process, avoid causing the influence to carbon fiber's preoxidation.

In order to ensure uniform flow field temperature and stable flow velocity in the pre-oxidation treatment process of the carbon fiber, a return air cavity of the pre-oxidation furnace and a tow channel are arranged in the same closed space. And the existing return air filter screen at the position of the return air cavity is replaced by adopting a drawing type structure. Therefore, in the working process of the pre-oxidation furnace, after the function of the return air filter screen for collecting the hair bundles fails, the return air filter screen needs to be replaced without stopping. At this time, the return air filter screen is drawn out from the position of the return air cavity, so that external cold air is easily sucked into the pre-oxidation furnace due to internal and external pressure difference, and the flow field in the tow channel is disturbed, and the pre-oxidation treatment quality of the carbon fiber is further reduced. It should be explained that the shutdown of the replacement of the return air filter will result in an affected ageing of the carbon fibre pre-oxidation treatment step, resulting in a reduced carbon fibre yield.

In addition, because the temperature in the pre-oxidation furnace is higher, the structure of the pull-type return air filter screen is influenced by high temperature, the thermal deformation of the pull-type track is easy to occur, and further the shell blocking is caused in the replacement process of the return air filter screen, so that the production progress is delayed.

Disclosure of Invention

According to the prior art, the pre-oxidation furnace adopts a structure of drawing type to replace a return air filter screen, so that the problems of carbon fiber quality and thermal deformation and shell blocking are easily affected.

First aspect

The invention provides a return air cavity for replacing a return air filter screen, which comprises: the device comprises an unreeling mechanism, an unreeling sealing shell, a reeling mechanism, a reeling sealing shell and a return air cavity;

the winding mechanism is accommodated in the winding sealing shell, and the unwinding mechanism is accommodated in the unwinding sealing shell; meanwhile, the rolling sealing shell and the unreeling sealing shell are respectively arranged at two sides of the air return cavity;

when the winding structure winds the return air filter screen to be replaced, the unreeling mechanism unreels the temporary-stored return air filter screen to be replaced under the driving of the winding mechanism, so that the replacement of the return air filter screen in the return air cavity is realized.

Specifically, one of the concepts of the invention is to realize the replacement of the return air filter screen in a winding mode, namely the return air cavity provided by the invention comprises an unreeling mechanism and a winding mechanism, wherein the unreeling mechanism is used for temporarily storing a clean return air filter screen to be replaced, and the winding mechanism is used for winding the failed return air filter screen. Through the cooperation of winding mechanism and unreeling mechanism, realize the swift change of return air filter screen. Meanwhile, the invention has the other conception that the winding mechanism and the unwinding mechanism are respectively accommodated in the winding sealing shell and the unwinding sealing shell, so that the interaction of the inside air and the outside air of the winding mechanism and the unwinding mechanism when the return air filter screen is wound is isolated, and further, the temperature uniformity change of circulating air and the flow field change are avoided. In practice, it is worth understanding that after the drawing type return air filter screen replacement mode is changed into the winding and unwinding type return air filter screen replacement mode, a relatively obvious defect exists, and in the normal operation process of the equipment, the drawing type return air filter screen replacement mode directly places the drawing box in the return air cavity, basically can be regarded as a sealed whole with the return air cavity, and the influence on the uniformity and stability of the circulating air temperature is avoided, and the defect is that the flow field of the circulating air is disturbed due to the fact that cold air is easily brought in when the equipment is replaced without stopping; if the wind cavity return air filter screen replacement mode of the winding and unwinding type return wind provided by the invention is adopted, the winding mechanism and the unwinding mechanism are arranged outside the return air cavity, so that the risk of cold air invasion exists. Therefore, the rolling seal shell and the unreeling seal shell are used for respectively guaranteeing the tightness of the rolling mechanism and the unreeling mechanism, isolating the contact with external cold air, thereby avoiding the cold air from entering the return air cavity in the rolling and unreeling process and causing the turbulence of a flow field and the change of temperature uniformity, namely, the scheme provided by the embodiment is that the improvement of the sealing type rolling and unreeling mechanism is used for the replacement of the return air filter screen, and the convenient replacement of the return air filter screen is realized under the premise of guaranteeing the stability of the flow field in the return air cavity and the temperature uniformity, so that the quality and the efficiency of the carbon fiber in the pre-oxidation treatment process are guaranteed.

It is appreciated that the present invention selects the external placement of the take-up and pay-off mechanisms without increasing the complexity of the mechanical mechanism. Because the winding mechanism can store clean return air filter screens which are limited, the situation of replacement needs to be faced, and the unwinding mechanism collects the invalid return air filter screens with the broken filaments, so that pollution to the interior of the return air cavity needs to be avoided. However, based on the present concept, the built-in winding mechanism and unreeling mechanism (which needs to balance the cost and the complexity of the mechanism) can also be selected under the support of the technology that the mechanism can be controlled electrically and the return air filter screen can be replaced independently.

In a further possible embodiment of the first aspect, a guide groove is arranged in the return air cavity;

the unreeling mechanism comprises an unreeling shaft and a first filter screen guide rod; the winding mechanism comprises a winding shaft and a second filter screen guide rod;

when the return air filter screen is rolled and replaced, the return air filter screen is rolled into the rolling shaft sequentially through the unreeling shaft, the first filter screen guide rod, the guide groove and the second filter screen guide rod; the first filter screen guide rod, the guide groove and the second filter screen guide rod enable the return air filter screen to be kept flush in the return air cavity.

Specifically, under the conception that the return air filter screen is replaced in a winding and unwinding mode, the risk of cold air entering is faced, and vibration is caused by the requirement of the return air filter screen on the rolling degree of freedom. It is easy to understand that the existing mode of pulling-out type replacement return air filter screen, the pull plate can also be used for fixing the degree of freedom of the return air filter screen. In the winding and unwinding mode of replacing the return air filter screen, vibration and bending are generated in the process of blowing circulating air after the return air filter screen loses a fixed support, so that the circulating air flow field is easy to be disturbed. Therefore, the guiding and limiting functions of the first filter screen guide rod, the guide groove and the second filter screen guide rod are adopted in the embodiment, so that the return air filter screen is prevented from vibrating greatly in the winding process, and the circulation airflow field is prevented from being disturbed. The guide groove is used for limiting a guide rail and radial freedom degrees of the return air filter screen, and in addition, radial wide discharge amount is preset in the guide groove in order to avoid the clamping shell of the return air filter screen caused by heat influence; the first filter screen guide rod and the second filter screen guide rod are used for forming support and orientation in the direction of the guide groove. In fact, if the return air filter screen is directly guided by the winding shaft and the unwinding shaft, the return air filter screen may be retracted and loosened, which is not beneficial to the filtering of the filament bundles and the stabilization of the circulating air flow field.

In a further possible embodiment of the first aspect, the take-up shaft and the second screen guide bar are provided with a drive chain, the first screen guide bar and the second screen guide bar are provided with a first driven chain, and the first screen guide bar and the take-up shaft are provided with a second driven chain.

Specifically, because the return air filter screen is through the 5 advancing parts of take-up reel, second filter screen guide bar, guide way, first filter screen guide bar and unreel axle, the heat influence that receives the circulation wind to bring, probably produce thermal deformation and lead to the return air filter screen to block the shell at the rolling in-process of changing, consequently this embodiment adopts drive chain, first driven chain and second driven chain to link to above-mentioned mechanism to eliminate the influence of card shell factor, keep the smoothness of return air filter screen in the rolling in-process of changing.

In a further possible embodiment of the first aspect, the first driven chain is arranged below the guide slot in a hidden manner and is spaced apart from the guide slot.

Specifically, because the unreeling shaft and the first filter screen guide rod are contained in the unreeling sealing shell, the reeling shaft and the second filter screen guide rod are contained in the reeling sealing shell, and the transmission chain and the second driven chain can not be protected. However, the first transmission chain spans the whole return air cavity, so as to avoid the influence on the filtering effect of the return air filter screen and the influence on the complexity of the mechanism, and is often used as a hidden mechanism and hidden below the guide groove.

In a further possible embodiment of the first aspect, the winding mechanism further comprises a pressing plate, a first connecting rod, a second connecting rod and a rotating shaft;

one end of the pressing plate is connected with the second filter screen guide rod, and the other end of the pressing plate is connected with the first connecting rod;

the second connecting rod and the door opening Guan Gujie of the rolling seal shell;

the rotating shaft is respectively connected with the free ends of the first connecting rod and the second connecting rod, so that transmission between the two is realized;

when the door switch is opened, the second filter screen guide rod is driven to be separated from the working state under the transmission action of the first connecting rod, the rotating shaft and the second connecting rod;

when the door switch is closed, the second filter screen guide rod is driven to enter a working state under the transmission action of the first connecting rod, the rotating shaft and the second connecting rod.

Specifically, the return air filter screen is in a tensioning state in the structure under the support of the first filter screen guide rod and the second filter screen guide rod. Therefore, the door switch of the rolling seal shell is linked with the second filter screen guide rod. When the door switch is turned on, the second filter screen guide rod is driven to relax, so that the return air filter screen is convenient to replace; when the door switch is closed, the air return filter is pressed under the drive of the second filter screen guide rod, so that the air return filter screen is in a tensioning state in the air return cavity.

In a further possible embodiment of the first aspect, a plurality of groups of filter screen fixing rods are symmetrically arranged on two sides of the guide groove in the return air cavity.

Specifically, because the length overlength and the width problem of return air filter screen in the return air cavity, realize radial fixed to return air filter screen in the guide way through multiunit filter screen dead lever, avoid the vibration of return air filter screen to the influence of circulation wind flow field.

In a further possible embodiment of the first aspect, the unreeling shaft is fixed by a detachable latch arranged outside the unreeling sealing shell.

Specifically, the detachable bolt is used for detaching the unreeling shaft.

In yet another possible embodiment, the winding shaft is fixed by a removable stem disposed outside the winding seal housing, while the stem also provides a manual rotation function.

In a further possible embodiment of the first aspect, a diversion channel is arranged between the winding seal shell and the return air cavity, and the diversion channel is arranged before the circulating air passes through the return air filter screen;

and when the circulating air enters the rolling sealing shell through the diversion channel before blowing to the return air filter screen.

Specifically, although the winding sealing shell realizes the separation of the air inside and outside the return air cavity, circulating air can enter at the outlet of the winding sealing shell through the return air filter screen, so that convection of the circulating air at the inlet and the outlet is caused. Therefore, the small circulation of circulating air in the winding sealing shell is realized through the diversion channel, so that the opposite impact of the air flow direction between the return air cavity and the winding sealing shell can not be generated, and the circulating air is disturbed. In addition, the shunt channel can unify the temperature between the winding sealing shell and the return air cavity, so that the influence of the exchange of cold air and hot air on the uniformity of the temperature of the flow field during unreeling is avoided.

In a further possible embodiment of the first aspect, a converging channel is arranged between the unreeling sealing shell and the return air cavity, and the converging channel is arranged after circulating air passes through the return air filter screen;

when circulating air enters the unreeling sealing shell through the opening of the unreeling sealing shell for moving the air return filter screen, the circulating air enters the air return cavity through the converging channel.

Specifically, the effect of the converging channel on the unreeling sealing shell is similar to the effect of the diverging channel on the reeling sealing shell, and the description is omitted here. In fact, the winding sealing shell and the unreeling sealing shell are arranged relative to the return air filter screen, so that smoothness of the winding process is guaranteed, and the problem that the return air filter screen is blocked due to the fact that the same-side winding is easy is avoided.

In a second aspect, the present invention provides a pre-oxidation oven comprising any one of the possible return air chambers described in the first aspect above.

Specifically, the return air cavity provided by the invention is mainly used for improving the replacement mode of the return air filter screen of the pre-oxidation furnace, and the application main body of the return air cavity is mainly the pre-oxidation furnace for producing carbon fibers.

In summary, the invention provides a return air cavity for replacing a return air filter screen and a pre-oxidation furnace, which at least have the following advantages by adopting a retractable return air filter screen replacement mode and a balance and seal design of circulating air, 1, the replacement efficiency of the return air filter screen is improved, and the productivity of carbon fiber pre-oxidation treatment is further improved; 2. the sealing structure is adopted to improve the defects that the existing drawing type return air filter screen replacement mode is easy to cause flow field disorder and temperature uniformity change, so that the quality of pre-oxidation treatment is better.

Drawings

The invention will be described in further detail below in connection with the drawings and the preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the invention. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is a schematic view of a return air chamber for screen replacement according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of an unreeling mechanism provided by an embodiment of the present invention;

FIG. 3 is a schematic structural view of a winding mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an opening and closing structure of a winding mechanism according to an embodiment of the present invention;

10. an unreeling mechanism; 20. unreeling the sealing shell; 30. a winding mechanism; 40. rolling the sealing shell; 50. a return air filter screen; 60. a return air cavity; 70. a tow channel; 11. a reel is unreeled; 12. a first screen guide bar; 21. unreeling towards the mouth; 31. a winding shaft; 32. a second screen guide bar; 33. a rotating handle; 34. a pressing plate; 35. a first link; 36. a rotating shaft; 37. a second link; 38. a door switch; 41. winding the orientation port; 61. a guide groove; 62. a filter screen fixing rod.

Detailed Description

The present invention will be described in detail with reference to fig. 1 to 4.

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1, a schematic diagram of a return air chamber for replacing a filter screen is provided in the embodiment of the present invention in fig. 1.

Specifically, the air return cavity provided in this embodiment includes an unreeling mechanism 10, an unreeling sealed shell 20, a reeling mechanism 30, a reeling sealed shell 40 and an air return cavity 60. The unreeling mechanism 10 is accommodated in the unreeling sealed shell 20, the reeling mechanism 30 is accommodated in the reeling sealed shell 40, the unreeling sealed shell 20 and the reeling sealed shell 40 are respectively arranged at two sides of the air return cavity 60, and butt joint of the unreeling port of the air return filter screen 50 of the unreeling sealed shell 20 and the reeling port of the air return filter screen 50 of the reeling sealed shell 40 is realized in the air return cavity 60.

The winding mechanism 30 is used for temporarily storing the clean return air filter 50, the unwinding mechanism 10 is used for temporarily storing the return air filter 50 which is out of filter, and the return air filter 50 in a working state is arranged in the return air cavity 60. However, when the detecting mechanism for the pre-oxidation treatment of the carbon fiber detects that the number of the broken filaments is increased or the quality of the pre-oxidation treatment of the carbon fiber is reduced, the pre-warning is performed, and the return air filter screen 50 needs to be replaced. At this time, the air return filter screen 50 is wound by the winding mechanism 30, and the unwinding mechanism 10 is driven by the winding mechanism 30 to synchronously unwind, so that the replacement of the air return filter screen 50 in the air return cavity 60 is completed, and the filter screen replacement efficiency is improved. Meanwhile, as the unreeling sealing shell 20 and the reeling sealing shell 40 are formed by encircling heat-insulating plates, the unreeling sealing shell 20, the air return cavity 60 and the reeling sealing shell 40 form a heat-insulating whole, and the heat exchange with external cold air is avoided, so that the flow field of circulating air is not broken in the replacement process of the air return filter screen 50, and the stability and the temperature uniformity of the flow field of the circulating air are ensured.

In yet another possible embodiment, the return air chamber provided in this embodiment is applied to a multi-layered pre-oxidation oven. As shown in fig. 1, the return air chamber 60 is provided with a plurality of layers at intervals, a space is reserved between the upper layer and the lower layer, and tow channels 70 are arranged in the space between the upper layer and the lower layer, so that circulating air is filtered by the return air filter screen 50 after passing through the return air chamber 60 and then enters the tow channels 70 in a circulating way. The efficiency of the carbon fiber pre-oxidation treatment is improved through the arrangement of the pre-oxidation furnace with the multilayer structure.

It should be noted that the structural design of the return air chamber provided by the invention is quite suitable for the multi-layer pre-oxidation furnace, and the pre-oxidation furnace can be directly arranged at two sides of the return air chamber 60 in groups.

In yet another possible embodiment, guide slots 61 are oppositely disposed in the single layer return air chamber 60 where the return air filter screen 50 is disposed, and the axial and radial degrees of freedom of the return air filter screen 50 are limited by the oppositely disposed guide slots 61. In practice, the guide slots 61 will be used in conjunction with the first screen guide bar 12 and the second screen guide bar 32, as shown in fig. 2 and 3. The unreeling mechanism 10 comprises an unreeling shaft 11 and a first filter screen guide rod 12, and a clean return air filter screen 50 is temporarily stored in the unreeling shaft 11 in a winding mode. The winding mechanism 30 comprises a winding shaft 31 and a second filter screen guide rod 32, and the filter screen recovered by winding is wound on the winding shaft 31 for temporary storage. When the return air filter screen 50 needs to be replaced due to filtration failure, the winding shaft 31 drives the winding of the return air filter screen 50 through rotation. The first filter screen guide rod 12, the second filter screen guide rod 32 and the guide groove 61 have supporting, guiding and direction limiting effects on the return air filter screen 50, so that the return air filter screen 50 is prevented from curling and vibrating greatly in the winding and replacing process, and the stability of the flow field of circulating air and the uniformity of temperature are ensured. It should be understood that if the return air filter 50 is changed, the return air filter 50 vibrates and bends in the return air chamber 60, which affects the collection of the filament bundles, and the flow of the circulating air will cause the return air filter 50 to vibrate back and forth in the return air chamber 60, so that the flow field of the circulating air is disturbed and the uniformity of the temperature is damaged. In addition, the first screen guide bar 12 and the second screen guide bar 32 also have the function of tightening the return air screen 50.

In a further possible embodiment, the winding shaft 31 and the second screen guide bar 32 are provided with a transmission chain, the first screen guide bar 12 and the second screen guide bar 32 are provided with a first driven chain, and the first screen guide bar 12 and the unwinding shaft 11 are provided with a second driven chain.

Specifically, because the return air filter 50 is thermally influenced by the circulating air through the winding shaft 31, the second filter guide rod 32, the guide groove 61, the first filter guide rod 12 and the 115 advancing parts of the unwinding shaft, thermal deformation may occur to cause the return air filter 50 to be blocked in the winding and replacing process, and therefore, the driving chain, the first driven chain and the second driven chain are adopted to link the mechanisms, thereby eliminating the influence of blocking factors and keeping the smoothness of the return air filter 50 in the winding and replacing process.

In fact, with the restriction of the degree of freedom of the return air filter 50 in the first filter guide bar 12, the second filter guide bar 32 and the guide slot 61. Although the guide slot 61 is preset with a radial width for sliding the return air filter 50, due to the high temperature in the return air chamber, under the thermal deformation of the return air filter 50, the first filter guide rod 12 and the second filter guide rod 32 may be blocked due to the supporting function. Therefore, the linkage among the winding shaft 31, the first filter screen guide rod 12, the second filter screen guide rod 32 and the unwinding shaft 11 is realized through the action of the transmission chain, the first driven chain and the second driven chain, so that the smoothness of the return air filter screen 50 in the winding process is ensured, and the reliability of a mechanical structure is improved.

In yet another possible embodiment, the first driven chain is hidden under the guide groove 61 and spaced apart from the guide groove 61.

Specifically, since the unreeling shaft 11 and the first filter screen guiding rod 12 are accommodated in the unreeling sealing shell 20, the reeling shaft 31 and the second filter screen guiding rod 32 are accommodated in the reeling sealing shell 40, and the driving chain and the second driven chain may not be protected. However, the first driving chain spans the whole return air cavity 60, so as to avoid the influence on the filtering effect of the return air filter screen 50 and the influence on the complexity of the mechanism, and often the first driving chain is used as a hidden mechanism and is hidden below the guide slot 61.

In fact, the first driven chain spans the entire return air cavity 60, employing a hidden design without affecting the return air screen 50 filtration integrity and circulating air contact area.

In a further possible embodiment, the first driven chain is replaced by a cyclically rolling ball. While the first driven chain may provide a drive between first screen guide bar 12 and second screen guide bar 32, it may squeeze the volume of tow channel 70. Therefore, in this embodiment, the space volume occupied by the transmission of the first filter screen guide rod 12 and the second filter screen guide rod 32 by means of the balls makes the structural design of the whole return air cavity more reasonable.

In yet another possible embodiment, multiple sets of filter fixing rods 62 are symmetrically disposed on both sides of the guide slot 61 of the return air chamber 60, as shown in fig. 1.

Specifically, in this embodiment, considering the radial width of the guide slot 61, when the length of the whole return air filter 50 in the return air cavity 60 is too long, the loosening and the front-back vibration are still not avoided, and the filter fixing rod 62 is used for keeping the straightness of the return air filter 50 in the return air cavity 60, so as to avoid the problem that the stability and the temperature uniformity of the circulating wind field are affected by the large vibration.

Referring to fig. 2, a schematic structural diagram of an unreeling mechanism 10 provided in the embodiment of the invention in fig. 2 is shown.

Specifically, the unreeling sealing shell 20 is composed of a square sealed heat-insulating plate, and the unreeling direction opening 21 of the unreeling sealing shell faces the air return cavity 60. The insulation board at the unreeled containment vessel 20 has been removed for clarity of illustration. In practice, the unreeling sealed housing 20 is provided with an opening at the passing position of the return air filter screen 50 for unreeling the return air filter screen 50.

In yet another possible embodiment, a diversion channel is provided between the winding seal shell 40 and the return air cavity 60, the diversion channel being provided before the circulating air passes through the return air filter screen 50;

the circulating air enters the wrap seal case 40 through the bypass passage before being blown toward the return air filter screen 50.

Specifically, although the winding seal shell 40 separates the air inside and outside the return air cavity 60, the circulating air can enter at the outlet of the winding seal shell 40 through the return air filter screen 50, thereby causing convection of the circulating air at the inlet and outlet. Therefore, the small circulation of the circulating air in the winding seal shell 40 is realized through the diversion channel, so that the opposite impact of the air flow direction between the return air cavity and the winding seal shell 40 can not be generated, and the disturbance of the circulating air is caused. In addition, the diversion channel can unify the temperature between the winding sealing shell 40 and the return air cavity 60, so that the uniformity of the flow field temperature is prevented from being influenced by the exchange of cold air and hot air during unreeling.

In practice, the pass through openings of the wrap seal housing 40 and the return air chamber 60 effect the wrap of the return air filter 50. The existence of the opening can lead circulating wind to flow in and out along the opening, so that convection and heat exchange are generated, and the stability and the temperature uniformity of the flow field of the circulating wind can be influenced. Therefore, a shunt channel is arranged at the different side of the winding direction opening 41 of the winding seal shell 40 and the second filter screen guide rod 32 for circulating air to enter the winding seal shell 40, so that the temperature consistency of the winding seal shell 40 and the return air cavity 60 is ensured, and the temperature change caused by air exchange between the winding seal shell and the return air cavity 60 is avoided. In addition, the shunt channel and the winding opening of the winding seal shell 40 for winding the return air filter screen 50 form circulation, so that the stability of the flow field of the return air cavity 60 during air flow exchange with the winding seal shell 40 is ensured.

Further, the flow of the diversion channel is consistent with the flow of the opening of the winding seal shell 40 for winding the return air filter screen 50, so as to ensure the flow balance of the wind circulation of the winding seal shell.

Further, a winding filter screen is further disposed in the winding seal shell 40, and is used for separating the wound return air filter screen from the shunt channel and the winding opening of the return air filter screen 50, so that the situation that the wound filter screen collects broken filaments when the winding seal shell is subjected to wind circulation is avoided, and pollution is caused in the return air cavity.

In yet another possible embodiment, a converging channel is disposed between the unreeling sealed shell 20 and the return air cavity 60, and the converging channel is disposed after the circulating air passes through the return air filter screen 50; when circulating air enters the unreeling sealing shell 20 through the opening of the unreeling sealing shell 20 for the return air filter screen 50 to move, the circulating air enters the return air cavity 60 through the confluence channel.

Specifically, the function of the converging channel in the unreeling seal case 20 is similar to that of the diverging channel in the reeling seal case 40, and will not be described again here.

Further, the flow rate of the converging channel is consistent with the flow rate of the opening of the unreeling sealing shell 20 for unreeling the return air filter screen, so as to ensure the flow balance of the wind circulation of the unreeling sealing shell.

Further, an unreeling filter screen is further disposed in the unreeling sealed shell 20, and is used for separating the unreeled air return filter screen from the converging channel and the unreeled opening of the air return filter screen 50, so that the air return filter screen 50 is prevented from being brought into the unreeled air return filter screen 50 by the wool filaments in the air return cavity when the unreeled sealed shell is subjected to air circulation, and pollution is caused to the clean air return filter screen 50.

It should be noted that, the winding sealing shell 40 and the unreeling sealing shell 20 are arranged opposite to the return air filter screen 50, so that smoothness of the winding process is ensured, and the problem that the return air filter screen 50 is blocked due to the same-side winding is avoided. And the arrangement of the converging and diverging passages is largely dependent upon the position of the wrap 40 and unwrap 20 relative to the return air screen 50. As shown in fig. 1, the unreeling sealing case 20 is located downstream of the circulating air, and thus, a confluence passage is provided such that the circulating air in the return air chamber 60 enters the unreeling sealing case 20 through the opening at the first filter screen guide bar 12, and only the confluence passage circulates into the return air chamber 60 again. And the upstream of the circulating air in the winding seal shell 40 is provided with a diversion channel, so that the circulating air in the return air cavity 60 enters the winding seal shell 40 through the diversion channel, and then circulates into the return air cavity 60 through the opening of the return air filter screen 50 arranged at the second filter screen guide rod 32.

In yet another possible embodiment, the unreeled containment vessel 20 includes a containment door open on either side of the return air removal cavity 60, and a removable latch. When the filter screen needs to be replaced, the unreeling shaft 11 is taken out of the sealing door through a detachable bolt, so that the unreeling of the return air filter screen 50 is performed.

Referring to fig. 3, a schematic structural diagram of a winding mechanism 30 according to the embodiment of the present invention is shown in fig. 3.

Specifically, the winding mechanism 30 is similar to the unwinding mechanism 10 in structure, and includes a winding seal housing 40 having a winding facing port 41 facing the return air chamber 60.

In yet another possible embodiment, the take-up reel 31 is secured by a removable stem 33 disposed outside the take-up seal housing 40, with the stem 33 also providing a manual rotation function. Wherein the handle 33 is detachably designed to facilitate removal of the take-up spool 31 from the door switch 38.

In another possible embodiment, the winding mechanism 30 further includes a pressing plate 34, a first link 35, a second link 37 and a rotating shaft 36, and when the door switch 38 is opened, the second filter screen guide rod 32 is driven to be separated from the working state under the transmission action of the first link 35, the rotating shaft 36 and the second link 37; when the door switch 38 is closed, the second filter screen guide rod 32 is driven to enter the working state under the transmission action of the first connecting rod 35, the rotating shaft 36 and the second connecting rod 37.

Specifically, the return air filter 50 is under tension in the structure, supported by the first filter guide rod 12 and the second filter guide rod 32. Thus, this embodiment links the door switch 38 of the roll-up seal housing 40 with the second screen guide bar 32. When the door switch 38 is opened, the second filter screen guide rod 32 is driven to relax, so that the return air filter screen 50 is convenient to replace; when the door switch 38 is closed, the second filter screen guide rod 32 is driven to press tightly, so that the return air filter screen 50 is ensured to be in a tensioning state in the return air cavity. Wherein, fig. 4 is an open-close state, and fig. 3 is a tensioning state.

In a further possible implementation aspect, the present invention provides a pre-oxidation oven comprising any one of the possible return air chambers described in the first aspect above.

Specifically, the return air cavity provided by the invention is mainly used for improving the replacement mode of the return air filter screen 50 of the pre-oxidation furnace, and the application main body of the return air cavity is mainly the pre-oxidation furnace for producing carbon fibers.

In fact, the invention can also be used for the return air cavity reconstruction project of the pre-oxidation furnace, and the return air cavity structure provided by the invention is modified to improve the replacement efficiency of the return air filter screen 50 and ensure the flow field stability and uniformity of the pre-oxidation furnace.

The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present invention may be better understood. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (10)

1. A return air chamber for screen replacement, the return air chamber comprising: the device comprises an unreeling mechanism (10), an unreeling sealing shell (20), a reeling mechanism (30), a reeling sealing shell (40) and a return air cavity (60);

the winding mechanism (30) is accommodated in the winding sealing shell (40), and the unwinding mechanism (10) is accommodated in the unwinding sealing shell (20); meanwhile, the rolling sealing shell (40) and the unreeling sealing shell (20) are respectively arranged at two sides of the air return cavity (60);

when the winding structure winds the return air filter screen (50) which needs to be replaced, the unwinding mechanism (10) unwinds the temporary-stored return air filter screen (50) to be replaced under the driving of the winding mechanism (30), so that the replacement of the return air filter screen (50) in the return air cavity (60) is realized.

2. A return air chamber for filter screen replacement as claimed in claim 1, wherein a guide slot (61) is provided in the return air chamber (60);

the unreeling mechanism (10) comprises an unreeling shaft (11) and a first filter screen guide rod (12); the winding mechanism (30) comprises a winding shaft (31) and a second filter screen guide rod (32);

when the return air filter screen (50) is rolled and replaced, the return air filter screen (50) is rolled into the rolling shaft (31) sequentially through the unreeling shaft (11), the first filter screen guide rod (12), the guide groove (61) and the second filter screen guide rod (32); the first filter screen guide rod (12), the guide groove (61) and the second filter screen guide rod (32) enable the return air filter screen (50) to be kept flush in the return air cavity (60).

3. A return air compartment for filter screen replacement as claimed in claim 2, characterized in that said winding shaft (31) and second filter screen guide bar (32) are provided with a transmission chain, said first filter screen guide bar (12) and second filter screen guide bar (32) are provided with a first driven chain, and said first filter screen guide bar (12) and unwinding shaft (11) are provided with a second driven chain.

4. A return air compartment for a filter screen change as claimed in claim 3 wherein said first driven chain is concealed below said guide slot (61) and spaced from said guide slot (61).

5. A return air compartment for filter screen replacement as claimed in claim 2, wherein said winding mechanism (30) further comprises a pressure plate (34), a first link (35), a second link (37) and a rotating shaft (36);

one end of the pressing plate (34) is connected with the second filter screen guide rod (32), and the other end of the pressing plate is connected with the first connecting rod (35);

the second connecting rod (37) is fixedly connected with a door switch (38) of the rolling seal shell (40);

the rotating shaft (36) is respectively connected with the free ends of the first connecting rod (35) and the second connecting rod (37) to realize transmission between the two;

when the door switch (38) is opened, the second filter screen guide rod (32) is driven to be separated from the working state under the transmission action of the first connecting rod (35), the rotating shaft (36) and the second connecting rod (37);

when the door switch (38) is closed, the second filter screen guide rod (32) is driven to enter a working state under the transmission action of the first connecting rod (35), the rotating shaft (36) and the second connecting rod (37).

6. A return air chamber for filter screen replacement as claimed in claim 2, characterized in that a plurality of groups of filter screen fixing rods (62) are symmetrically arranged on both sides of the guide groove (61) in the return air chamber (60).

7. A return air compartment for filter screen replacement as claimed in claim 2, characterized in that said unwinding shaft (11) is fixed by means of a removable latch arranged outside the unwinding sealing housing (20).

8. A return air chamber for filter screen replacement as claimed in claim 1, characterized in that a shunt channel is provided between the winding seal shell (40) and the return air chamber (60), said shunt channel being provided before the circulating air passes through the return air filter screen (50);

and circulating air enters the rolling sealing shell (40) through the diversion channel before being blown to the return air filter screen (50).

9. A return air chamber for filter screen replacement as claimed in claim 1, characterized in that a converging channel is provided between the unreeling sealed shell (20) and the return air chamber (60), said converging channel being provided after the circulating air passes through the return air filter screen (50);

when circulating air enters the unreeling sealing shell (20) through an opening of the unreeling sealing shell (20) for moving the air return filter screen (50), the circulating air enters the air return cavity (60) through the confluence channel.

10. A pre-oxidation oven provided with a return air compartment for screen replacement as claimed in any one of claims 1 to 9.

Images