Smoking device for improving optical fiber curing effect

By designing a smoke extraction device with an oil fume separation structure, the problem of incomplete oil fume removal in existing technologies has been solved, thereby improving the fiber curing effect and ensuring the appearance quality.

CN223688250UActive Publication Date: 2025-12-19ZHONGTIAN TECH FIBER OPTICS +2
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Patent Information

Application Number
CN202520112570.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-17
Publication Date
2025-12-19
Estimated Expiration
2035-01-17

AI Technical Summary

Technical Problem

The existing fume extraction devices in curing ovens are not effective in removing oil fumes, which can easily lead to poor fiber curing. Furthermore, excessively high exhaust velocities can affect the appearance and color of the fiber.

Method used

A smoke extraction device was designed, including a housing, a sealing plate, a smoke exhaust column, and a vent pipe plug-in port. It adopts an oil fume separation design, which separates and removes oil fumes through structures such as a condensation channel, a separation chamber, and a smoke exhaust column. Combined with a guide block and smoke blocking holes, the smoke extraction effect is improved.

Benefits of technology

It effectively removes oil and smoke residue from the surface of optical fibers, improves the fiber curing effect, and collects oil stains through the flow guide block, ensuring the appearance quality of the optical fibers and improving smoke extraction efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a smoke exhaust device for improving the optical fiber curing effect. The smoke exhaust device comprises a box body, a sealing plate, a smoke exhaust column and an air exhaust pipe insertion and extraction opening, a condensation channel is coaxially embedded in the upper surface of the box body, a separation cavity is coaxially embedded in the lower surface of the box body, the lower end of the separation cavity is a large-diameter end, the upper end of the separation cavity is a small-diameter end matched with the condensation channel in diameter, and the separation cavity is communicated with the condensation channel; a sealing plate is horizontally screwed on the lower surface of the box body, and a smoke discharge column is coaxially arranged on the upper surface of the sealing plate; a gap is formed between the upper end of the smoke exhaust column and the inclined surface of the separation cavity, a plurality of smoke dispersing holes are uniformly formed in the smoke exhaust column at intervals in a penetrating manner, and smoke blocking holes are formed in the upper surface of the sealing plate in a penetrating manner; one side of the outer circumferential surface of the box body is provided with an exhaust pipe plugging port close to the bottom end, one end of the exhaust pipe plugging port is communicated with the exhaust pipe, and the other end of the exhaust pipe plugging port is communicated with the separation cavity. According to the utility model, oil smoke separation design is adopted, oil smoke generated by curing is separated and removed, and the optical fiber curing effect is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber manufacturing and processing technical field, concretely relates to a smoke extractor that improves optical fiber solidification effect. BACKGROUND

[0002] With the increasingly fierce competition of the optical fiber market, the optical fiber production cost is being continuously reduced to meet the market demand. As a necessary equipment of optical fiber, the power consumption reduction and cost control advantage of the solidification furnace are obvious, and the new type LED solidification furnace also arises at the historic moment with the demand of power consumption reduction. Since the LED is a cold light source with single solidification wavelength, the matched paint is easy to produce oil fume in the solidification process, thereby affecting the optical fiber solidification effect, so the design of the solidification furnace supporting device for removing oil fume has become the research content of each optical fiber manufacturer.

[0003] The existing smoke extractor of the solidification furnace is specially designed with a special air extraction pipeline for oil fume extraction, the plug inside is considered to be opened and is specially designed with a cavity to improve the smoke extraction wind speed effect, but the formed oil stain treatment and effect are not ideal, and if the air extraction wind speed is too large, the optical fiber solidification will be poor, thereby leading to the appearance color. Therefore, the above problems need to be solved. SUMMARY

[0004] The utility model solves the technical problem to provide a smoke extractor that improves optical fiber solidification effect, adopts oil fume separation design, separates and removes the oil fume generated in solidification, thereby having good removal effect on the optical fiber surface oil fume adhesion, and improves the optical fiber solidification effect.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: the utility model discloses a kind of improve the solidification effect of optical fiber smoking device, its innovation point is at: including box, sealing plate, smoke column and exhaust pipe plug-in opening;The box is vertically arranged cylindrical structure, and coaxially vertical embedding is opened with circular condensation passage on its upper surface, the lower end of the condensation passage vertically extends to the inside intermediate position of the box, and coaxially vertical embedding is opened with circular-truncated cone-shaped separation cavity on the lower surface of the box, the lower end of the separation cavity is large-diameter end smaller than the diameter of box, and its upper end is small-diameter end matched with the diameter of condensation passage, and it is communicated with the condensation passage;Matching sealing plate is also horizontally arranged coaxially and screwed on the lower surface of the box, and hollow cylindrical smoke column is also vertically arranged coaxially on the upper surface of the sealing plate;The upper end of the smoke column and the inclined surface between the separation cavity form gap, and a plurality of smoke holes are also uniformly distributed and spaced inclinedly embedded and opened through on the outer circumferential surface of the smoke column along its circumferential direction, and smoke hole matched with the inner diameter of smoke column is also coaxially vertically embedded and opened through on the upper surface of the sealing plate in the middle position, and then solidified smoke and oil stain separated are extracted through exhaust pipe.

[0006] Preferably, curing furnace mounting flange matched with the box is also coaxially sleeved and fixed on the outer circumferential surface of the box near its top end, the curing furnace mounting flange is annular structure, and its upper surface is flush with the upper surface of the box and is integrally formed with the box, and then the box and the curing furnace are connected together by screwing through the curing furnace mounting flange.

[0007] Preferably, glass tube mounting block is also vertically arranged coaxially on the upper surface of the box in the middle position, and the diameter of the glass tube mounting block is greater than the diameter of the condensation passage and is integrally formed with the box;Glass tube mounting groove for mounting glass tube is also coaxially vertically embedded and opened on the upper surface of the glass tube mounting block, the diameter of the glass tube mounting groove is greater than the diameter of the condensation passage, and the upper end of the condensation passage vertically extends to the inside of the glass tube mounting block and is communicated with the glass tube mounting groove.

[0008] Preferably, a circular cooling liquid cavity is coaxially embedded in the inner part of the box relative to the condensing channel position, which is coaxially and spacedly sleeved on the condensing channel, and the wall thickness of the condensing channel and the cooling liquid cavity ensures that the condensing channel can be cooled by heat exchange with the cooling liquid in the cooling liquid cavity, and then the oil stains generated in the solidification process are condensed by the condensing channel; an inlet pipe and an outlet pipe are vertically fixed and spaced on one side of the outer circumferential surface of the box relative to the cooling liquid cavity position, the inlet pipe is arranged at the top end of the cooling liquid cavity, and the outlet pipe is arranged at the bottom end of the cooling liquid cavity; one end of the inlet pipe extends vertically into the inner part of the box and communicates with the cooling liquid cavity, so that the cooling liquid is sent into the cooling liquid cavity through the inlet pipe; one end of the outlet pipe extends vertically into the inner part of the box and communicates with the cooling liquid cavity, so that the cooling liquid in the cooling liquid cavity is discharged through the outlet pipe and forms a circulation loop.

[0009] Preferably, the inclination angle of the inclined surface of the separation cavity is 30°-45°, and the small diameter end of the inclined surface is chamfered to transition with the lower end of the condensing channel, so as to ensure that the separated oil stains flow along the inclined surface of the separation cavity.

[0010] Preferably, a chamfer is coaxially provided on the outer circumferential surface of the smoke exhaust column near the top end, and the gap between the top end of the smoke exhaust column and the inclined surface of the separation cavity is 5-10 mm.

[0011] Preferably, each smoke exhaust hole is inclined along the radial direction of the smoke exhaust column, and the end close to the center of the smoke exhaust column is the upper end and communicates with the inner part of the smoke exhaust column; the end away from the center of the smoke exhaust column is inclined downward and communicates with the separation cavity, so as to facilitate the extraction of the solidified smoke in the smoke exhaust column through the smoke exhaust hole.

[0012] Preferably, the smoke blocking hole is a circular truncated cone structure, and the upper end is a large diameter end matched with the inner diameter of the smoke exhaust column; the taper angle of the smoke blocking hole is 90°-135°, and the lower end is a small diameter end matched with the optical fiber and vertically extends out of the lower surface of the sealing plate.

[0013] Preferably, the setting position of the exhaust pipe plug-in opening does not interfere with the screw connection of the sealing plate and the box body, and a circular truncated cone-shaped flow guide block is coaxially and horizontally sleeved on the bottom end of the smoke exhaust column, and the flow guide block does not interfere with the smoke exhaust hole; the flow guide block is matched with the large diameter end of the separation cavity, and is coaxially and fixedly arranged on the upper surface of the sealing plate, and does not interfere with the screw connection of the sealing plate and the box body, so that when the sealing plate and the box body are coaxially screwed, the outer circumferential surface of the flow guide block is attached to the inclined surface of the separation cavity; an inclined surface is embedded on the upper surface of the flow guide block, the inclined surface is inclined downward to the exhaust pipe plug-in opening, and the lower end of the inclined surface is arranged in a straight line with the lower end of the exhaust pipe plug-in opening, so that the separated oil stains are guided and collected to the exhaust pipe plug-in opening through the inclined surface of the flow guide block.

[0014] The beneficial effects of the utility model are as follows:

[0015] (1) The utility model discloses an oil fume separation design, which separates and removes the solidified oil fume, thereby having a good removal effect on the oil fume attached to the surface of the optical fiber and improving the optical fiber solidification effect.

[0016] (2) The utility model discloses a flow guide block, which is convenient for collecting the separated oil stains and discharging the oil stains through the exhaust pipe plug-in opening.

[0017] (3) The utility model discloses a smoke exhaust column and a smoke exhaust hole, which are convenient for discharging the solidified smoke through the exhaust pipe plug-in opening.

[0018] (4) The utility model discloses a smoke blocking hole, which has a certain smoke blocking effect, thereby improving the smoking effect. DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can be obtained according to the drawings without creative labor for those skilled in the art.

[0020] Figure 1 It is a structural schematic view of the utility model discloses a kind of smoking device for improving optical fiber solidification effect.

[0021] Figure 2 It is Figure 1 Local enlarged schematic view of middle smoke exhaust column part.

[0022] Wherein, 1 - box body; 2 - solidification furnace mounting flange; 3 - glass tube mounting block; 4 - glass tube mounting groove; 5 - cooling liquid cavity; 6 - condensation passage; 7 - separation cavity; 8 - liquid inlet pipe; 9 - liquid outlet pipe; 10 - sealing plate; 11 - smoke exhaust column; 12 - smoke exhaust hole; 13 - flow guide block; 14 - smoke blocking hole; 15 - exhaust pipe plug-in opening; 16 - optical fiber. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be described clearly and completely by specific embodiments.

[0024] The smoke extraction device for improving the curing effect of optical fiber of the utility model, including box body 1, sealing plate 10, smoke exhaust column 11 and exhaust pipe plug-in opening 15, the specific structure is as shown in Figure 1 、 Figure 2 Box body 1 is vertically arranged cylindrical structure, and the upper surface is coaxially and vertically embedded with circular condensation passage 6, the lower end of condensation passage 6 vertically extends to the inside lower position of box body 1, and the lower surface of box body 1 is coaxially and vertically embedded with circular-truncated-cone-shaped separation cavity 7, the lower end of separation cavity 7 is large-diameter end smaller than the diameter of box body 1, and the upper end is small-diameter end matched with the diameter of condensation passage 6, and is communicated with condensation passage 6, wherein the inclination angle of separation cavity 7 is 30 ° ~ 45 °, and the joint of small-diameter end and the lower end of condensation passage 6 needs to be chamfered, so as to ensure that the separated oil stains are guided along the inclined surface of separation cavity 7.

[0025] As shown in Figure 1 The upper surface of solidification furnace mounting flange 2 is flush with the upper surface of box body 1 and is integrally formed with box body 1, so that box body 1 and solidification furnace are connected together by screwing through solidification furnace mounting flange 2.

[0026] As shown in Figure 1 The upper surface of box body 1 is vertically and coaxially provided with glass tube mounting block 3, and the diameter of glass tube mounting block 3 is greater than the diameter of condensation passage 6 and is integrally formed with box body 1, and the upper surface of glass tube mounting block 3 is coaxially and vertically embedded with glass tube mounting groove 4 for mounting glass tube, the diameter of glass tube mounting groove 4 is greater than the diameter of condensation passage 6, and the upper end of condensation passage 6 vertically extends to the inside of glass tube mounting block 3 and is communicated with glass tube mounting groove 4.

[0027] As shown in Figure 1As shown in the box 1 in the interior relative to the condensation channel 6 position is still coaxially embedded with circular cooling liquid cavity 5, cooling liquid cavity 5 coaxially spaced sleeve set on the condensation channel 6, and its wall thickness with the condensation channel 6 need to ensure that the cooling liquid in the cooling liquid cavity 5 can be through the condensation channel 6 to carry out heat exchange cooling, and then through the condensation channel 6 to the solidification process of oil stain condensation; In the outer circumferential surface of the box 1 side relative to the cooling liquid cavity 5 position is still vertically fixed with the liquid inlet pipe 8 and the liquid outlet pipe 9, the liquid inlet pipe 8 is set at the top end of the cooling liquid cavity 5, and the liquid outlet pipe 9 is set at the bottom end of the cooling liquid cavity 5; The one end of the liquid inlet pipe 8 extends vertically to the inside of the box 1, and is communicated with the cooling liquid cavity 5, and then the cooling liquid is sent into the cooling liquid cavity 5 through the liquid inlet pipe 8; The one end of the liquid outlet pipe 9 extends vertically to the inside of the box 1, and is communicated with the cooling liquid cavity 5, and then the cooling liquid in the cooling liquid cavity 5 is discharged through the liquid outlet pipe 9, and forms a circulating loop.

[0028] The utility model discloses still horizontal coaxial alignment screw in the lower surface of the box 1 is provided with the sealing plate 10 that is matched with it, and the hollow cylindrical shape of the smoke exhaust column 11 is vertically arranged on the upper surface of the sealing plate 10. Figure 1 、 Figure 2 As shown in the figure, the gap is formed between the upper end of the smoke exhaust column 11 and the inclined surface of the separation cavity 7, and a plurality of smoke dispersing holes 12 are uniformly distributed and spaced apart and inclinedly embedded and penetrated on the outer circumferential surface of the smoke exhaust column 11 along the circumferential direction thereof, and a smoke blocking hole 14 matched with the inner diameter of the smoke exhaust column 11 is coaxially and vertically embedded and penetrated on the upper surface of the sealing plate 10 at the middle position thereof; The air extraction pipe plug-in opening 15 is vertically fixed on one side of the outer circumferential surface of the box 1 near the bottom end thereof, one end of the air extraction pipe plug-in opening 15 is communicated with the air extraction pipe, and the other end thereof is communicated with the separation cavity 7, so that the separated solidified smoke and oil stains can be extracted through the air extraction pipe; wherein, a chamfer is coaxially arranged on the outer circumferential surface of the smoke exhaust column 11 near the top end thereof, and the size of the gap between the top end of the smoke exhaust column 11 and the inclined surface of the separation cavity 7 is 5-10 mm.

[0029] As shown in the figure, Figure 1 、 Figure 2 Each smoke dispersing hole 12 is inclinedly arranged along the radial direction of the smoke exhaust column 11, one end of each smoke dispersing hole 12 near the center of the smoke exhaust column 11 is the upper end, and the other end of each smoke dispersing hole 12 away from the center of the smoke exhaust column 11 is inclinedly arranged downward and communicated with the separation cavity 7, so that the solidified smoke in the smoke exhaust column 11 can be extracted through the smoke dispersing hole 12 and the air extraction pipe.

[0030] As shown in the figure, Figure 1 、 Figure 2As shown, the smoke blocking hole 14 is a circular truncated cone structure, and its upper end is a large diameter end matched with the inner diameter of the smoke exhaust column 11; the taper angle of the smoke blocking hole 14 is 90°-135°, and its lower end is a small diameter end matched with the optical fiber 16 and vertically extends out of the lower surface of the sealing plate 10.

[0031] As shown in the drawings, Figure 1 , Figure 2 The setting position of the exhaust pipe plug-in opening 15 does not interfere with the screw connection of the sealing plate 10 and the box body 1, and a circular truncated cone-shaped flow guide block 13 is coaxially and horizontally sleeved on the smoke exhaust column 11 at the bottom end thereof, and the flow guide block 13 does not interfere with the smoke exhaust hole 12; the flow guide block 13 is matched with the large diameter end of the separation cavity 7, and is coaxially and fixedly arranged on the upper surface of the sealing plate 10, and does not interfere with the screw connection of the sealing plate 10 and the box body 1, so that when the sealing plate 10 and the box body 1 are coaxially screwed, the outer circumferential surface of the flow guide block 13 is in contact with the inclined surface of the separation cavity 7; an inclined surface is also embedded on the upper surface of the flow guide block 13, which is inclined downward towards the exhaust pipe plug-in opening 15, and the lower end of the inclined surface is arranged in a straight line with the lower end of the exhaust pipe plug-in opening 15, so that the separated oil stains are guided and collected to the exhaust pipe plug-in opening 15 through the inclined surface of the flow guide block 13.

[0032] The working principle of the utility model is as follows: firstly, the box body 1 is fixedly connected with the curing furnace through the flange 2, then the exhaust pipe is connected with the box body 1 through the exhaust pipe plug-in opening 15, and the glass tube is installed in the glass tube installation groove 4; then the cured optical fiber 16 is sequentially threaded through the condensing pipeline, the smoke exhaust column 11 and the smoke blocking hole 14, and in the process of threading the optical fiber 16, the oil stains generated in the curing process are condensed into liquid in the condensing channel 6, and are guided along the inclined surface of the separation cavity 7 to the flow guide block 13, and then are collected to the exhaust pipe plug-in opening 15 through the inclined surface of the flow guide block 13, and are discharged through the exhaust pipe; at the same time, the cured smoke is collected in the smoke exhaust column 11, and is discharged from the smoke exhaust column 11 through the smoke exhaust hole 12 and the exhaust pipe.

[0033] The utility model has the advantages of:

[0034] (1) The utility model adopts the oil fume separation design, separates and removes the oil fume generated in the curing process, thereby having a good removal effect on the oil fume adhered to the surface of the optical fiber 16, and improving the curing effect of the optical fiber 16;

[0035] (2) The utility model is provided with the flow guide block 13, which is convenient for collecting the separated oil stains and discharging them through the exhaust pipe plug-in opening 15;

[0036] (3) The utility model is provided with the smoke exhaust column 11 and the smoke exhaust hole 12, which are used in cooperation, thereby being convenient for discharging the cured smoke through the exhaust pipe plug-in opening 15;

[0037] (4) The utility model discloses a set up smoke hole 14, can play certain smoke -resisting effect to the effect of smoking is improved.

[0038] The above-described embodiments are merely preferred embodiments of the utility model, and do not limit the design concept and scope of the utility model, and various modifications and improvements to the technical scheme of the utility model made by the ordinary engineering technical personnel in the art without departing from the design concept of the utility model shall fall within the protection scope of the utility model, and the technical content of the utility model claimed for protection has been entirely recorded in the technical requirements.

Claims

1. A smoking device to improve the solidification effect of an optical fiber, characterized by: The utility model provides a smoke separating and solidifying device, which comprises a box, a sealing plate, a smoke discharging column and a smoke exhaust pipe plug-in opening, wherein the box is a vertically arranged cylindrical structure, a circular condensing channel is coaxially and vertically embedded in the upper surface of the box, the lower end of the condensing channel vertically extends to the inside of the box, a circular truncated cone-shaped separation cavity is coaxially and vertically embedded in the lower surface of the box, the lower end of the separation cavity is a large-diameter end smaller than the diameter of the box, the upper end of the separation cavity is a small-diameter end matching the diameter of the condensing channel, and the upper end of the separation cavity communicates with the condensing channel, a sealing plate matching the box is horizontally and coaxially screwed on the lower surface of the box, a hollow cylindrical smoke discharging column is vertically and coaxially arranged on the upper surface of the sealing plate, a gap is formed between the upper end of the smoke discharging column and the inclined surface of the separation cavity, a plurality of smoke discharging holes are uniformly and spaced apart embedded in the outer circumferential surface of the smoke discharging column along the circumferential direction of the smoke discharging column, a smoke blocking hole matching the inner diameter of the smoke discharging column is coaxially and vertically embedded in the upper surface of the sealing plate, a smoke exhaust pipe plug-in opening is vertically fixed on one side of the outer circumferential surface of the box near the bottom end of the box, one end of the smoke exhaust pipe plug-in opening communicates with the smoke exhaust pipe, and the other end of the smoke exhaust pipe plug-in opening communicates with the separation cavity, so that the separated solidified smoke and oil stains are extracted through the smoke exhaust pipe.

2. The smoking device of claim 1, wherein: A solidifying furnace mounting flange matching the box is coaxially and fixedly sleeved on the outer circumferential surface of the box near the top end of the box, the solidifying furnace mounting flange is a circular ring structure, the upper surface of the solidifying furnace mounting flange is flush with the upper surface of the box, and the solidifying furnace mounting flange is integrally formed with the box, so that the box and the solidifying furnace are screw-connected together through the solidifying furnace mounting flange.

3. The smoking device of claim 1, wherein: A glass tube mounting block is vertically and coaxially arranged on the upper surface of the box at the middle position of the box, the diameter of the glass tube mounting block is greater than the diameter of the condensing channel, and the glass tube mounting block is integrally formed with the box, a glass tube mounting groove for mounting a glass tube is coaxially and vertically embedded in the upper surface of the glass tube mounting block, the diameter of the glass tube mounting groove is greater than the diameter of the condensing channel, the upper end of the condensing channel vertically extends to the inside of the glass tube mounting block, and the condensing channel communicates with the glass tube mounting groove.

4. The smoking device of claim 2, wherein: In the interior of the box relative to the condensation channel position also coaxial embedded with annular cooling liquid cavity, the cooling liquid cavity coaxial spacing sleeve set in the condensation channel, and its wall thickness with condensation channel need to ensure that the cooling liquid in the cooling liquid cavity can be through the condensation channel for heat exchange cooling, and then through the condensation channel to the oil stain produced by solidification process is condensed; In the outer circumferential surface of the box one side relative to the cooling liquid cavity position also vertically fixed with inlet pipe and outlet pipe, the inlet pipe is set in the cooling liquid cavity top position, and the outlet pipe is set in the cooling liquid cavity bottom position; The one end of the inlet pipe extends vertically to the interior of the box, and is communicated with the cooling liquid cavity, and then the cooling liquid is sent into the cooling liquid cavity through the inlet pipe; The one end of the outlet pipe extends vertically to the interior of the box, and is communicated with the cooling liquid cavity, and then the cooling liquid in the cooling liquid cavity is discharged through the outlet pipe, and forms a circulating loop.

5. The smoking device of claim 1, wherein: The inclination angle of the inclined surface of the separation cavity is 30°~45°, and the small diameter end of the inclined surface is combined with the lower end of the condensation channel, which needs to be chamfered to ensure that the separated oil stain flows along the inclined surface of the separation cavity.

6. The smoking device of claim 1, wherein: A chamfer is formed on the outer circumferential surface of the smoke exhaust column near the top end, and the gap between the top end of the smoke exhaust column and the inclined surface of the separation cavity is 5~10mm.

7. The smoking device of claim 1, wherein: Each of the smoke holes is inclined along the radial direction of the smoke exhaust column, and the end close to the center of the smoke exhaust column is the upper end, which is communicated with the interior of the smoke exhaust column; The end of each smoke hole away from the center of the smoke exhaust column is inclined downward and communicated with the separation cavity, so that the solidified smoke in the smoke exhaust column can be easily extracted through the smoke hole by the exhaust pipe.

8. The smoking device of claim 1, wherein: The smoke blocking hole is a circular truncated cone structure, and the upper end is a large diameter end matched with the inner diameter of the smoke exhaust column; The taper angle of the smoke blocking hole is 90°~135°, and the lower end is a small diameter end matched with the optical fiber, which extends vertically downward out of the lower surface of the sealing plate.

9. The smoking device of claim 1, wherein: The setting position of the exhaust pipe plug-in opening does not interfere with the screw connection of the sealing plate and the box, and a circular truncated cone shaped flow guide block is horizontally coaxially sleeved on the smoke exhaust column near the bottom end, which ensures that the flow guide block does not interfere with the smoke hole; The flow guide block is matched with the large diameter end of the separation cavity, and is coaxially fixed on the upper surface of the sealing plate, which does not interfere with the screw connection of the sealing plate and the box, so that when the sealing plate and the box are coaxially screwed, the outer circumferential surface of the flow guide block is matched with the inclined surface of the separation cavity; An inclined surface is embedded in the upper surface of the flow guide block, which is inclined downward towards the exhaust pipe plug-in opening, and the lower end of the inclined surface is arranged in a straight line with the lower end of the exhaust pipe plug-in opening, so that the separated oil stain is guided to the exhaust pipe plug-in opening by the inclined surface of the flow guide block.