CN111229029A

CN111229029A - Photocatalytic fiber air purification device and use method thereof

Info

Publication number: CN111229029A
Application number: CN202010126939.8A
Authority: CN
Inventors: 张国基; 张希兰; 汤燕雯; 赵甜
Original assignee: Foshan Jinjingchuang Environmental Protection Technology Co ltd
Current assignee: Foshan Jinjingchuang Environmental Protection Technology Co ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-06-05

Abstract

The invention discloses a photocatalytic fiber air purification device, which purifies air through photocatalytic fibers and comprises a frame body, a plurality of photocatalytic fibers arranged in the frame body, a stretching assembly connected with the photocatalytic fibers, and an ultraviolet lamp facing the irradiation of the photocatalytic fibers, wherein the photocatalytic fibers at least comprise fiber-forming high polymers and nano titanium dioxide particles mixed in the fiber-forming high polymers, the fiber-forming high polymers are mixed with the nano titanium dioxide particles to directly perform spinning to generate the photocatalytic fibers, the free ends of the photocatalytic fibers are fixed with a stretching plate, and the stretching plate can move along the length direction of the photocatalytic fibers. According to the invention, the photocatalytic fibers arranged in the frame body purify the air, titanium dioxide particles are not easy to lose, relatively fixed and not easy to agglomerate, and meanwhile, the exposure rate of the titanium dioxide particles can be improved by stretching the photocatalytic fibers, the air can be continuously purified within a certain time, and the catalytic reaction can be controlled to a certain extent.

Description

Photocatalytic fiber air purification device and use method thereof

Technical Field

The invention relates to the technical field of air purification, in particular to a photocatalytic fiber air purification device and a using method thereof.

Background

The air purification is to sterilize and disinfect the indoor air, remove dust and haze, remove harmful decoration residues, remove peculiar smell and the like, improve the quality of home life and protect the health of people.

The photocatalyst is a substance that does not change itself but promotes a chemical reaction under irradiation of light. The photocatalyst converts light energy into energy of chemical reaction to generate catalytic action, so that surrounding water molecules and oxygen are excited into hydroxyl free radicals and superoxide ion free radicals with strong oxidizing power, organic substances and partial inorganic substances harmful to human bodies and the environment can be decomposed, the reaction is accelerated, no resource waste is caused, and no new pollution product is formed.

The catalytic reaction process is that the reactant reacts around the catalyst, and the peripheral reactant continuously diffuses towards the catalyst (because the reactant is continuously consumed and the concentration is reduced), and the product continuously diffuses towards the periphery, namely the process comprises the seven steps of ① raw material molecules diffuse towards the catalyst from the main gas flow, ② raw material molecules close to the catalyst diffuse towards the inner surface of the micropores, ③ raw material molecules close to the surface of the catalyst are adsorbed by the catalyst, ④ adsorbed molecules perform chemical reaction under the action of the catalyst, ⑤ product molecules are desorbed from the catalyst, ⑥ desorbed product molecules diffuse outwards from the micropores, and ⑦ product molecules diffuse into the main gas flow from the outer surface of the catalyst and then leave the reactor.

At present, because of the pollution-free and sustainable properties of photocatalysts, photocatalysts have been used for air purification, for example, the most extensive nano titanium dioxide particles, but nano powder is easy to run off and agglomerate, and has health risks to human bodies, so that the nano titanium dioxide particles are generally loaded on a carrier, but the conventional surface coating is easy to be adhered by dirt, so that the catalytic efficiency is reduced, and the catalytic efficiency is uncontrollable. Therefore, it is necessary to provide a further solution to the above problems.

Disclosure of Invention

The invention aims to provide a photocatalytic fiber air purification device and a using method thereof, so as to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a photocatalytic fiber air purification device purifies air through photocatalytic fibers, and comprises a frame body, a plurality of photocatalytic fibers arranged in the frame body, a stretching assembly connected with the photocatalytic fibers, and an ultraviolet lamp facing the photocatalytic fibers;

the frame body is formed by enclosing a first group of plates, a second group of plates and a third group of plates, the first group of plates comprise two fixing plates which are oppositely arranged, one end of each photocatalytic fiber is fixed with one fixing plate, the other end of each photocatalytic fiber extends towards the other fixing plate, the second group of plates comprise two light blocking plates which are oppositely arranged, the two light blocking plates are respectively arranged on the side edges of the fixing plates and are fixed with the fixing plates, the ultraviolet lamps are arranged on the light blocking plates and irradiate towards the photocatalytic fibers, the third group of plates comprise two ventilation plates which are oppositely arranged, and the two ventilation plates are respectively arranged on the side edges of the fixing plates and are fixed with the fixing plates and the corresponding light blocking plates;

the stretching assembly comprises a stretching plate, the stretching plate is arranged between the two fixing plates, the free ends of the photocatalytic fibers are fixed with the stretching plate, and the stretching plate can move along the length direction of the photocatalytic fibers;

the photocatalytic fiber at least comprises a fiber-forming high polymer and nano titanium dioxide particles mixed in the fiber-forming high polymer, and the fiber-forming high polymer is mixed with the nano titanium dioxide particles to directly perform spinning to generate the photocatalytic fiber.

Preferably, the photocatalytic fiber is of a sheath-core structure and comprises a sheath layer and a core layer coated in the sheath layer, wherein the sheath layer at least comprises a fiber-forming high polymer and nano titanium dioxide particles mixed in the fiber-forming high polymer.

Preferably, an air guide assembly is arranged between the two fixed plates, the air guide assembly comprises a plurality of air guide plates which are arranged in a staggered mode, the plurality of air guide plates form a Z-shaped air flow path, the air guide plates are fixed with the fixed plates or the light barrier, and the stretching plate is provided with a position avoiding hole corresponding to the air guide plates and can move along the length direction of the air guide plates.

Preferably, the stretching assembly further comprises a pulling rope connected with the stretching plate and a rope winder, the rope winder is fixed on the fixing plate far away from the photocatalytic fibers, and the pulling rope is connected to one surface, back to the photocatalytic fibers, of the stretching plate and connected with the rope winder.

Preferably, a sliding groove is formed in the light barrier, two ends of the stretching plate are respectively provided with a sliding block matched with the sliding groove, and the stretching rope pulls the stretching plate to slide in the sliding groove. .

Preferably, the device further comprises a filter screen arranged at the tail end of the air flow direction.

Preferably, the photocatalytic fibers have an axial direction perpendicular to the direction of air flow.

Preferably, the cross section of the photocatalytic fiber is of a flat sheet structure.

The invention also provides a using method of the photocatalytic fiber air purification device, which comprises the following steps:

adjusting the distance between the stretching plate and the fixing plate to be proper;

starting the ultraviolet lamp;

and moving the stretching plate to stretch the photocatalytic fiber at regular time or according to the air environment condition, so that a crack structure is generated on the surface of the photocatalytic fiber.

Preferably, the suitable distance is such that the photocatalytic fiber is naturally vertically in a non-stretched state.

Preferably, the draw sheet is moved 2-5cm away from the photocatalytic fiber every 160-200 hours.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the photocatalytic fibers arranged in the frame body purify the air, titanium dioxide particles are not easy to lose, relatively fixed and not easy to agglomerate, and meanwhile, the exposure rate of the titanium dioxide particles can be improved by stretching the photocatalytic fibers, the air can be continuously purified within a certain time, and the catalytic reaction can be controlled to a certain extent.

(2) The invention adopts the fiber-forming high polymer to polymerize the nanometer titanium dioxide particles and adopts the direct spinning production, namely the fiber is not required to be stretched in a pre-orientation degree, the production cost of the fiber is low, and simultaneously, the fiber which is not subjected to the pre-orientation treatment has low structural strength and low structural stability, so the fiber is easy to be stretched and deformed in the subsequent use, namely, higher cracking degree can be generated with smaller pulling force, and the manufacturing cost of the equipment is reduced.

(3) The equipment enables the outer surface of the photocatalytic fiber to be cracked by stretching the photocatalytic fiber, on one hand, the cracks enable dirt or reactant covered on the surface of the fiber to at least partially fall off, a certain cleaning effect is achieved, the titanium dioxide particles on the exposed surface are recovered, on the other hand, the titanium dioxide particles inside are exposed inwards from the cracking positions, therefore, the phenomenon that catalytic reaction is slowed down or stopped is avoided at two points, and the catalytic reaction process can be controlled to a certain degree by controlling the exposure rate of the titanium dioxide particles.

(4) The invention forms a Z-shaped air circulation path through the air guide assembly, so that air flows through more photocatalytic fibers in a limited space, and the purification efficiency is improved.

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 schematic perspective view of the present invention, wherein the photocatalytic fibers are not shown;

FIG. 2 is a schematic perspective view of FIG. 1 with a ventilation board and a light barrier removed;

FIG. 3 is a schematic top view of the fixing plate of FIG. 1 with a fixing plate removed;

FIG. 4 is a schematic perspective view of the structure of FIG. 1 with a ventilation board, a portion of the air deflector, and a portion of the photocatalytic fibers removed;

FIG. 5 is a schematic cross-sectional view of a photocatalytic fiber in one embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a photocatalytic fiber in another embodiment of the present invention.

Specifically, 10-frame, 11-fixing plate, 12-light barrier, 13-ventilation plate, 131-ventilation area, 132-covering area, 1311-ventilation hole,

20-photocatalytic fiber, 21-skin layer, 22-core layer,

30-stretching component, 31-stretching plate, 311-avoiding hole, 32-pulling rope, 33-rope winder,

40-an ultraviolet lamp, wherein the ultraviolet lamp,

50-wind guide assembly, 51-first wind guide plate, 52-second wind guide plate 51.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Fig. 1 shows a schematic perspective view of a photocatalytic fiber air purification device, wherein the photocatalytic fiber is not shown for clarity of illustration.

As shown in fig. 1, a photocatalytic fiber air purification device for purifying air through photocatalytic fiber comprises a frame body 10, a plurality of photocatalytic fibers 20 disposed in the frame body 10, a stretching assembly 30 connected to the plurality of photocatalytic fibers 20, and an ultraviolet lamp 40 irradiating toward the plurality of photocatalytic fibers 20. Through the inside photocatalytic fiber 20 air-purifying that sets up of framework 10, the titanium dioxide granule is difficult for running off to relatively fixed, difficult reunion can be through the tensile to photocatalytic fiber 20 simultaneously, realize the improvement to the naked rate of titanium dioxide granule, continuous air-purifying in a certain time, and realize the control to catalytic reaction to a certain extent.

Specifically, framework 10 is enclosed to establish by first group board, second group board and third group board and forms, and first group board is including two fixed plates 11 of relative setting, and second group board is including two light baffles 12 of relative setting, and two light baffles 12 set up respectively in the side of fixed plate 11 to rather than fixed, and third group board is including two ventilation board 13 of relative setting, and two ventilation board 13 set up respectively in the side of fixed plate 11, and rather than fixed with corresponding barn door 12. The frame body 10 forms a relatively closed space by a plurality of plates, so that air flows in through one ventilation plate and flows out through the other ventilation plate, and the inner space is purified. In order to improve the air circulation efficiency, an air extractor or a blower may be disposed inside or outside the frame 10 as required, and further, an air extractor or a blower of appropriate power may be selected in cooperation to generate a large wind force, providing a function similar to a fan. Further, a humidifying device may be further provided in the housing 10 to deliver humidified and clean air.

The fixed plate 11, the light barrier 12 is preferably a non-through-hole plate to provide a convenient and flexible mounting location for the internal components. The ventilation plate 13 is provided with a ventilation hole 1311 penetrating the thickness direction to allow air to freely flow, and the diameter of the ventilation hole 1311 is preferably 2 to 5 cm. To reduce the contact between the internal components and the outside while ensuring the air circulation, the ventilation board 13 may be configured to include two regions, one is a ventilation region 131 and the other is a covering region 132, the ventilation hole 1311 is disposed in the ventilation region 131 to realize the air circulation, and other components, such as a rope winder 33 (to be described later), are disposed behind the covering region 132 to reduce the direct contact with the outside, thereby prolonging the service life of the device.

The photocatalytic fiber 20 at least comprises a fiber-forming high polymer and nano titanium dioxide particles mixed in the fiber-forming high polymer, and the fiber-forming high polymer mixed with the nano titanium dioxide particles is directly spun to generate the photocatalytic fiber 20. The fiber-forming polymer may be a polyester material, but is not limited thereto. In the manufacturing process, nano titanium dioxide particles are pre-added into the polyester fiber spinning solution and are directly spun without pre-orientation degree stretching, only the spun nascent fiber is needed, the process requirement on the raw material fiber is limited only by preliminary preparation, and therefore, the fiber production cost is low. Meanwhile, because a large number of non-orderly arranged macromolecular chains or chain segments exist in the fibers which are not subjected to pre-orientation treatment, the fibers are low in structural strength and structural stability, and are easy to stretch and deform during subsequent use, namely, higher cracking degree can be generated with smaller pulling force, and the equipment manufacturing cost is reduced. In the using process, the outer surface of the photocatalytic fiber 20 is cracked through stretching, on one hand, the cracks enable dirt or reactants covered on the fiber surface to at least partially fall off to play a certain cleaning role and recover the titanium dioxide particles exposed on the surface, on the other hand, the titanium dioxide particles in the fiber are exposed inwards from the cracking positions, so that the phenomenon that the catalytic reaction is slowed down or stopped is avoided at two points, and the catalytic reaction process can be controlled to a certain extent by controlling the exposure rate of the titanium dioxide particles.

Fig. 2 is a schematic perspective view of a photocatalytic fiber air purification apparatus, in which a ventilation plate and a light blocking plate are omitted to show the internal structure thereof.

As shown in fig. 2, the specific arrangement of the photocatalytic fibers 20 in the frame 10 is: one end of the plurality of photocatalytic fibers 20 is fixed to one fixing plate 11, and the other end extends in the direction of the other fixing plate 11, i.e., the photocatalytic fibers 20 are naturally straightened along the axis thereof. The plurality of photocatalytic fibers 20 are generally arranged in an array along both the length and the width of the fixing plate 11, and further, the photocatalytic fibers 20 may be densely arranged in hundreds or thousands to improve the purification efficiency. Preferably, the photocatalytic fiber 20 has an axial direction perpendicular to the direction of air flow to ensure adequate contact of the air with the crack sites of the photocatalytic fiber 20.

The UV lamp 40 is disposed on the light barrier 12 and irradiates toward the photocatalytic fiber 20, and the wavelength range thereof is preferably 250-380 nm. Further, the ultraviolet lamp 40 is embedded in the light barrier 12 to reduce the protruding parts, thereby realizing a smooth surface of the light barrier 12 and facilitating the installation and movement of other parts.

The stretching assembly 30 comprises a stretching plate 31, the stretching plate 31 is arranged between the two fixing plates 11, the free ends of the photocatalytic fibers 20 are fixed with the stretching plate 31, and the stretching plate 31 can move along the length direction of the photocatalytic fibers 20 to drive the photocatalytic fibers 20 to stretch to generate cracks. And the same stretching plate 31 can ensure that a plurality of photocatalytic fibers 20 connected to the same stretching plate are subjected to the same tensile force, so that the uniform cracking degree is achieved, namely the exposure rate of titanium dioxide particles is kept the same, and the control of the catalytic process is realized.

Fig. 3 is a schematic top view of a photocatalytic fiber air purification device, in which a fixing plate is omitted to show internal components.

Fig. 4 is a schematic perspective view of a photocatalytic fiber air purification device, in which a ventilation plate and a part of the air deflector, photocatalytic fiber are omitted.

According to a preferred embodiment of the present invention, as shown in fig. 2-4, an air guiding assembly 50 is disposed between the two fixing plates 11, the air guiding assembly 50 includes a plurality of air guiding plates arranged in a staggered manner, and the plurality of air guiding plates form a Z-shaped air flow path, so that the air flows through more photocatalytic fibers 20 in a limited space, thereby improving the purification efficiency.

Specifically, the air guiding plate includes a plurality of first air guiding plates 51 and a plurality of second air guiding plates 52, one side of the first air guiding plate 51 is tightly attached to one air shielding plate 12, the opposite side is separated from another air shielding plate 12 by a distance, and the second air guiding plates 52 are opposite to the first air guiding plates 51 and are arranged at intervals one by one. When the fixing device is fixed, the air deflector is fixed with the fixing plate 11 or the light barrier 12, preferably fixed with the fixing plate 11 to form an integrated replaceable core together with the fixing plate, the stretching plate and the photocatalytic fiber, and the replaceable core is detachably connected with the light barrier 12, so that consumable materials can be replaced, and replacement cost is reduced.

The length of the air deflection plates is preferably set to be the same as the stretched length of the photocatalytic fibers 20 to ensure that the air flow path is always Z-shaped during the useful life of the purifier. In order to match with the air deflector, the stretching plate 31 is provided with a position-avoiding hole 311 (as shown in fig. 4) corresponding to the air deflector, and can move along the length direction of the air deflector, so as to stretch the photocatalytic fiber 20. Meanwhile, the plurality of air deflectors further limit the movement of the stretching plate 31, and prevent the uneven force application to the photocatalytic fiber 20 above the stretching plate 31 due to the inclined plate surface when the stretching plate 31 moves and influence the cracking effect of the photocatalytic fiber 20. Further, the width of the avoiding hole 311 is slightly larger than the thickness of the air guide plate, so as to reduce friction during movement and reduce required tension.

According to a preferred embodiment of the present invention, as shown in fig. 2 and 4, the stretching assembly 30 further comprises a pulling rope 32 connected to the stretching plate 31, and a rope winder 33, wherein the rope winder 33 is fixed on the fixing plate 11 far away from the photocatalytic fiber 20, and the pulling rope 32 is connected to a surface of the stretching plate 31 far away from the photocatalytic fiber 20 and connected to the rope winder 33 to realize the movement of the stretching plate 31. Preferably, in order to reduce the influence of the clearance holes 311 on the pulling, a plurality of pulling ropes 32 are provided on the stretching plate 31. Preferably, the tensile board 31 back is provided with colludes the ring, and the stay cord 32 is connected with colluding the ring through the couple, makes things convenient for the dismouting to the core is replaced to the cooperation quick replacement.

According to a preferred embodiment of the present invention, the light barrier 12 is provided with a sliding slot, two ends of the stretching plate 31 are respectively provided with a matching sliding block, and the pulling rope 32 pulls the stretching plate 31 to slide in the sliding slot, so as to reduce the friction between the stretching plate 31 and the light barrier 12, make the movement smoother, and reduce the required pulling force.

According to a preferred embodiment of the present invention, the apparatus further comprises a filter net disposed at the end of the air flowing direction, i.e., at one side of the ventilation board 13 in the air flowing out direction, to intercept large particles and unpurified particles in the air.

FIG. 5 shows a schematic cross-sectional view of a photocatalytic fiber in a photocatalytic fiber air purification device.

According to a preferred embodiment of the present invention, the photocatalytic fiber 20 is a skin-core structure, and includes a skin layer 21 and a core layer 22 coated in the skin layer 21, the skin layer 21 at least includes a fiber-forming polymer and nano titanium dioxide particles mixed in the fiber-forming polymer to participate in a catalytic reaction and form cracks to increase the bare rate of the titanium dioxide particles, and the core layer mainly plays a role of connection, and generally does not generate cracks, so that the titanium dioxide particles do not need to be doped to reduce the fiber production cost. Further preferably, cortex thickness is 1 times of core thickness at least, and in the tensile process, the cortex extends at first and produces preliminary fissure to along with further drawing, by preliminary fissure inward extension for the degree of depth fissure, cortex thickness reduces step by step, and final cortex thickness can reduce to about 1/2 of original thickness.

According to a preferred embodiment of the present invention, the photocatalytic fiber 20 can also be a hollow structure, i.e. the core layer 22 is hollow and the skin layer 21 has a circular cross section, so that the weight of the photocatalytic fiber 20 can be greatly reduced, and the photocatalytic fiber also has a larger surface area, and is loaded with more titanium dioxide particles on the surface, and the crack area is increased, thereby providing more pre-exposed titanium dioxide particles.

FIG. 6 shows a schematic cross-sectional view of another photocatalytic fiber in a device for purifying air using photocatalytic fibers.

According to a preferred embodiment of the present invention, as shown in fig. 6, the cross section of the photocatalytic fiber 20 is a flat sheet structure to obtain a larger specific surface area. In the present embodiment, the cross section of the photocatalytic fiber 20 is approximately rectangular, and the long side thereof has undulations.

adjusting the distance between the stretching plate 31 and the fixing plate 11;

starting the ultraviolet lamp 40;

the stretching plate 31 is moved to stretch the photocatalytic fiber 20 at regular time or according to the air environment condition, so that a crack structure is generated on the surface of the photocatalytic fiber 20.

According to a preferred embodiment of the present invention, the suitable distance is such that the photocatalytic fiber 20 is in a non-stretched state after being detoured.

According to a preferred embodiment of the present invention, the drawing plate 31 is moved 2-5cm away from the photocatalytic fiber 20 every 160-200 hours.

In conclusion, the photocatalytic fibers arranged in the frame body purify the air, titanium dioxide particles are not easy to lose, are relatively fixed and are not easy to agglomerate, and meanwhile, the exposure rate of the titanium dioxide particles can be improved by stretching the photocatalytic fibers, the air can be continuously purified within a certain time, and the catalytic reaction can be controlled to a certain degree.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A photocatalytic fiber air purification device is characterized by comprising a frame body, a plurality of photocatalytic fibers arranged in the frame body, a stretching assembly connected with the photocatalytic fibers, and an ultraviolet lamp facing the irradiation of the photocatalytic fibers;

2. The air purifying device of claim 1, wherein the photocatalytic fiber has a core-sheath structure, and comprises a sheath layer and a core layer coated in the sheath layer, wherein the sheath layer comprises at least a fiber-forming polymer and nano-titania particles mixed in the fiber-forming polymer.

3. The photocatalytic fiber air purification device according to claim 1, wherein an air guide assembly is arranged between the two fixing plates, the air guide assembly comprises a plurality of air guide plates which are arranged in a staggered manner, the plurality of air guide plates form a Z-shaped air flow path, the air guide plates are fixed with the fixing plates or the light barrier, and the stretching plate is provided with a position avoiding hole opposite to the air guide plates and can move along the length direction of the air guide plates.

4. The photocatalytic fiber air purification device according to claim 1, wherein the stretching assembly further comprises a pulling rope connected with the stretching plate, and a rope winder fixed on the fixing plate far away from the photocatalytic fiber, wherein the pulling rope is connected with one surface of the stretching plate far away from the photocatalytic fiber and connected with the rope winder.

5. The photocatalytic fiber air purification device according to claim 1, wherein a sliding groove is formed in the light barrier, matching sliding blocks are respectively arranged at two ends of the stretching plate, and the stretching plate is pulled by the pulling rope to slide in the sliding groove.

6. The air purifying device of claim 1, further comprising a filter net disposed at the end of the air flow direction.

7. The air purifying apparatus of claim 1, wherein the photocatalytic fibers are oriented in an axial direction perpendicular to the direction of air flow.

8. The air purifying device of claim 1, wherein the cross-section of the photocatalytic fiber is a flat sheet structure.

9. The use method of the photocatalytic fiber air purification device according to any one of claims 1 to 8, characterized by comprising the steps of:

starting the ultraviolet lamp;

10. The method of using a photocatalytic fiber air purification device according to claim 9, wherein the suitable distance is such that the photocatalytic fiber is naturally vertically in a non-stretched state.