Air inlet device and optical fiber drawing cooling equipment

Abstract

The utility model discloses an air inlet device. The air inlet device comprises an air inlet pipeline, a transition cylinder and a Venturi pipe fitting, the outlet end of the air inlet pipeline is communicated with the interior of the transition barrel; the venturi pipe fitting is fixed in the transition cylinder, an air inlet cavity is formed between the outer wall of the venturi pipe fitting and the inner wall of the transition cylinder, and the upper part and the lower part of the air inlet cavity are sealed; the Venturi pipe fitting comprises an upper pipe section and a lower pipe section which are connected with each other; an upper channel is arranged in the upper pipe section; a plurality of air inlet holes communicated with the upper channel are formed in the lower portion of the upper pipe section in the circumferential direction, and the air inlet holes incline upwards from outside to inside. A lower channel is formed in the lower pipe section of the Venturi pipe fitting, and the lower channel and the upper channel are coaxially arranged and vertically communicated. The utility model also discloses optical fiber drawing cooling equipment. The beneficial effects of the utility model are that the helium enters the gas inlet cavity through the gas inlet pipeline, then enters the Venturi pipe fitting through the gas inlet hole in an inclined upward manner, and is purged and filled in the cooling pipe section in the upper channel, thereby greatly reducing the helium amount brought out from the lower optical fiber outlet by the optical fiber which continuously moves downwards, reducing the helium loss, and reducing the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber preparation, in particular to an air intake device and optical fiber drawing cooling equipment. Background Art

[0002] After the optical fiber preform is melted in a high-temperature furnace at 2000 degrees, it is pulled into a φ124.5um optical fiber and needs to be quickly cooled to room temperature. At present, the commonly used cooling equipment is made of aluminum alloy. After the cooling tube is closed, the inner cavity is filled with helium to conduct heat and cool the optical fiber. When the optical fiber is produced at a high speed, the helium in the cooling tube will be carried out of the cooling tube equipment by the optical fiber produced at a high speed, resulting in a large waste of helium and increasing production costs.

[0003] Therefore, it is necessary to improve the prior art. Summary of the invention

[0004] The utility model aims to provide an air intake device and an optical fiber drawing cooling device to reduce the loss of helium and lower the production cost in view of the shortcomings of the prior art.

[0005] The technical solution adopted by the utility model is: an air intake device, including an air intake pipeline, a transition cylinder and a venturi pipe;

[0006] The outlet end of the air intake duct is in communication with the interior of the transition cylinder;

[0007] The venturi tube is fixed in the transition cylinder, an air inlet cavity is formed between the outer wall of the venturi tube and the inner wall of the transition cylinder, and the upper and lower parts of the air inlet cavity are sealed;

[0008] The venturi tube comprises an upper tube section and a lower tube section connected to each other; an upper channel is arranged in the upper tube section; a plurality of air inlet holes connected to the upper channel are opened in the circumferential direction of the lower part of the upper tube section, and the direction of the air inlet holes is inclined upward from the outside to the inside;

[0009] The lower pipe section of the venturi tube is provided with a lower channel, and the lower channel is coaxially arranged with the upper channel and is connected up and down.

[0010] According to the above solution, the upper channel of the Venturi tube is a tapered channel with a small upper opening and a large lower opening.

[0011] According to the above solution, the upper part of the Venturi tube is fixed in the transition cylinder through a through-hole nut, and the through-hole of the through-hole nut is coaxial with and communicated with the upper channel of the Venturi tube.

[0012] According to the above scheme, the outer wall surface of the through hole nut is threadedly connected to the inner wall surface of the transition cylinder; the bottom of the through hole nut is provided with a step hole, which is adapted to the step at the upper end of the Venturi tube.

[0013] According to the above scheme, a through hole is opened in the center of the lower end of the transition cylinder, and the through hole at the lower end of the transition cylinder is connected to the lower opening of the lower channel of the Venturi tube.

[0014] According to the above scheme, an inner upper sealing ring is provided at the upper part of the air inlet cavity, and the inner upper sealing ring is located at the connection between the through-hole nut and the upper end of the Venturi tube fitting; the bottom of the Venturi tube fitting is provided with a step adapted to the outer wall of the lower pipe section of the Venturi tube fitting, and an inner lower sealing ring is provided at the step.

[0015] The utility model also discloses an optical fiber drawing cooling device, comprising a plurality of cooling pipe sections and a plurality of air intake devices as described above for introducing helium, wherein the plurality of cooling pipe sections are arranged in sequence from top to bottom; an air intake device is arranged between two upper and lower adjacent cooling pipe sections, the lower end of an upper cooling pipe section is butted against an upper port of the air intake device, the interior of the upper cooling pipe section is communicated with an upper channel of a venturi tube of the air intake device, the upper end of a next cooling pipe section is butted against a lower through hole of the air intake device, the interior of the next cooling pipe section is communicated with a lower channel of the venturi tube of the air intake device; the optical fiber passes through each cooling pipe section and each air intake device in sequence from top to bottom.

[0016] According to the above scheme, the upper end of the transition cylinder of the air intake device is connected to the cooling pipe section through a clamping piece; bosses are respectively provided at both ends of the cooling pipe section, and the bosses are provided with through holes connected to the interior of the cooling pipe section; the outer walls of the upper and lower ends of the transition cylinder are respectively provided with an outer upper sealing ring and an outer lower sealing ring; one end of the clamping piece is provided with a groove adapted to the boss, and the other end of the clamping piece is adapted to and pressed with the outer upper sealing ring or the outer lower sealing ring.

[0017] According to the above solution, the cooling pipe section is a split structure, including two pipe section monomers, and the two pipe section monomers are spliced ​​together to form the cooling pipe section.

[0018] According to the above scheme, the outer upper sealing ring and the outer lower sealing ring are both O-type sealing rings.

[0019] The beneficial effects of the utility model are:

[0020] In the utility model, a venturi tube is provided in the transition cylinder, and the air inlet of the venturi tube is designed to face upward. After the helium enters the air inlet cavity through the air inlet pipe, it enters the venturi tube obliquely upward through the air inlet. Since the upper channel of the venturi tube is designed to be a cone with a small upper opening and a large lower opening, the helium is swept upward in the upper channel and filled into the cooling pipe section, which greatly reduces the amount of helium brought out from the optical fiber outlet below by the optical fiber that continuously moves downward, reduces the loss of helium, and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the air intake device in the utility model.

[0022] Figure 2 Schematic diagram of the structure of the Venturi tube.

[0023] Figure 3 This is a schematic diagram of the disassembled intake device.

[0024] Figure 4 Schematic diagram of the flow of gas into the intake device.

[0025] Figure 5 It is a structural schematic diagram of the optical fiber drawing cooling device in the utility model.

[0026] Figure 6 It is a schematic diagram of the structure of the cooling pipe section.

[0027] Figure 7 The structure of the card connector is shown in FIG. Figure 1 .

[0028] Figure 8 The structure of the card connector is shown in FIG. Figure 2 .

[0029] Fig. 9 This is a schematic diagram of the structure of the recycling card.

[0030] Fig.10 It is a schematic diagram of the connection between the clamp, transition cylinder and cooling pipe section.

[0031] Among them: 1. air inlet pipe; 2. outer upper sealing ring; 3. through-hole nut; 4. transition cylinder; 5. inner upper sealing ring; 6. Venturi pipe fitting; 6.1. upper pipe section; 6.1.1. upper channel; 6.1.2. air inlet hole; 6.2. lower pipe section; 6.2.1. lower channel;

[0032] 7. Air inlet cavity; 8. Inner lower sealing ring; 9. Outer lower sealing ring; 10. Optical fiber; 11. Cooling pipe section; 11.1. Pipe section monomer; 11.2. Boss; 12. Connector; 13. Recovery card; 14. Recovery air pipe. DETAILED DESCRIPTION

[0033] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 3 An air intake device shown includes an air intake pipe 1, a transition cylinder 4 and a venturi tube 6;

[0035] The outlet end of the air intake pipe 1 is in communication with the interior of the transition cylinder 4;

[0036] The venturi tube 6 is fixed in the transition cylinder 4, and an air inlet cavity 7 is formed between the outer wall of the venturi tube 6 and the inner wall of the transition cylinder 4, and the upper and lower parts of the air inlet cavity 7 are sealed; the outlet end of the air inlet pipe 1 is connected to the air inlet cavity 7;

[0037] The venturi tube 6 comprises an upper tube section 6.1 and a lower tube section 6.2 connected to each other; an upper channel 6.1.1 is provided in the upper tube section 6.1; a plurality of air inlet holes 6.1.2 connected to the upper channel 6.1.1 are provided in the circumferential direction of the lower part of the upper tube section 6.1, and the air inlet holes 6.1.2 are inclined upward from the outside to the inside;

[0038] The lower pipe section 6.2 of the Venturi tube is provided with a lower channel 6.2.1, and the lower channel 6.2.1 is coaxially arranged with the upper channel 6.1.1 and is connected up and down.

[0039] In the present invention, the upper opening of the upper channel 6.1.1 of the Venturi tube 6 is connected to the outside, and the lower opening of the lower channel 6.2.1 of the Venturi tube 6 is connected to the outside; more specifically, the upper channel 6.1.1 and the lower channel 6.2.1 of the Venturi tube 6 are respectively connected to the inside of the cooling pipe section 11 described later.

[0040] In the utility model, the axis of the air intake pipe 1 is perpendicular to the axis of the transition cylinder 4, and the air intake pipe is made of PET or other plastic materials.

[0041] The gas introduced into the air inlet pipe 1 enters the air inlet cavity 7 of the transition cylinder 4, and then enters the Venturi pipe 6 obliquely upward through the air inlet hole 6.1.2 of the Venturi pipe 6. Figure 4 shown.

[0042] Preferably, the upper channel 6.1.1 of the Venturi tube 6 is a tapered channel with a small upper opening and a large lower opening.

[0043] In the utility model, Figure 2 As shown, the air inlet hole 6.1.2 is located at the bottom of the tapered channel and is connected to the tapered channel. After the airflow enters the air inlet cavity 7 and forms pressure in the air inlet cavity 7 (i.e., between the inner wall of the transition cylinder 4 and the outer wall of the venturi tube 6), it enters the interior of the venturi tube 6 through the air inlet hole 6.1.2 of the venturi tube 6, forming an upward airflow. Figure 4 shown.

[0044] Preferably, the upper portion of the Venturi tube 6 is fixed in the transition cylinder 4 via a through-hole nut 3 , and the through-hole of the through-hole nut 3 is coaxial with and connected to the upper channel 6 . 1 . 1 of the Venturi tube 6 .

[0045] In the utility model, the outer wall surface of the through hole nut 3 is threadedly connected to the inner wall surface of the transition cylinder 4; the bottom of the through hole nut 3 is provided with a step hole, which is adapted to the step at the upper end of the venturi tube 6.

[0046] In the present invention, a through hole is opened at the center of the lower end of the transition cylinder 4, and the through hole at the lower end of the transition cylinder 4 is communicated with the lower opening of the lower channel 6.2.1 of the Venturi tube 6.

[0047] Preferably, an inner upper sealing ring 5 is provided at the upper part of the air inlet chamber 7, and the inner upper sealing ring 5 is located at the connection between the through-hole nut 3 and the upper end of the Venturi tube fitting 6. After the through-hole nut 3 is tightened, the inner upper sealing ring 5 is pressed to seal the upper end of the air inlet chamber 7; the bottom of the Venturi tube fitting 6 is provided with a step that is adapted to the outer wall of the lower pipe section 6.2 of the Venturi tube fitting 6, and an inner lower sealing ring 8 is provided at the step for sealing the lower end of the air inlet chamber 7.

[0048] In the present invention, the inner upper sealing ring 5 and the inner lower sealing ring 8 are both O-type sealing rings; the two inner sealing rings play a sealing role in the transition cylinder 4, which can ensure the air tightness inside the transition cylinder 4 and prevent gas from escaping.

[0049] In this embodiment, the transition cylinder 4 is made of metal, and a thread matching the through-hole nut 3 is provided inside the upper end of the transition cylinder 4, and a step is provided at the lower end of the transition cylinder 4 to facilitate the installation of the venturi tube 6. Both inner sealing rings are made of rubber, and the inner diameters are smaller than the outer diameter of the transition cylinder 4. The through-hole nut 3 is made of metal and is threadedly connected to the upper part of the filter cylinder. The outer diameter of the step hole of the through-hole nut 3 matches the outer diameter of the step at the upper end of the venturi tube 6, and the inner upper sealing ring 5 is provided at the connection between the two.

[0050] In this embodiment, the installation process of the air intake device is: connect the air intake pipe 1 with the transition cylinder 4, place the inner lower sealing ring 8 on the bottom step inside the transition cylinder 4, then place the Venturi tube 6 on the inner lower sealing ring 8, then place the inner upper sealing ring 5, and then tighten the through hole nut 3 to complete the sealing.

[0051] like Figure 2 The optical fiber drawing cooling device shown includes a plurality of cooling pipe segments 11 and a plurality of air intake devices for introducing helium, wherein the plurality of cooling pipe segments 11 are arranged in sequence from top to bottom; an air intake device is arranged between two adjacent cooling pipe segments 11, the lower end of the upper cooling pipe segment 11 is connected to the upper port of the air intake device, the interior of the upper cooling pipe segment 11 is connected to the upper channel 6.1.1 of the Venturi tube 6 of the air intake device, the upper end of the next cooling pipe segment 11 is connected to the lower end through hole of the air intake device, and the interior of the next cooling pipe segment 11 is connected to the lower channel 6.2.1 of the Venturi tube 6 of the air intake device; the optical fiber 10 passes through each cooling pipe segment 11 and each air intake device in sequence from top to bottom.

[0052] In the utility model, the air intake device is used to introduce helium, and the helium enters each cooling pipe section 11. The optical fiber 10 passes through each cooling pipe section 11 and each air intake device from top to bottom while exchanging heat with the helium for cooling.

[0053] Preferably, the upper end of the transition cylinder 4 of the air intake device is connected to the cooling pipe section 11 via a clamping piece 12 .

[0054] Specifically, bosses 11.2 (which may be truncated cone-shaped) are respectively provided at both ends of the cooling pipe section 11, and the bosses 11.2 are provided with through holes connected to the interior of the cooling pipe section 11; the outer walls of the upper and lower ends of the transition cylinder 4 are respectively provided with an outer upper sealing ring 2 and an outer lower sealing ring 9; the clamping member 12 is provided with screw holes along the circumferential direction, and one end of the clamping member 12 is provided with a groove matched with the boss 11.2. After the boss 11.2 is inserted into the groove, the clamping member 12 is connected to the cooling pipe section 11 through the bolts in the screw holes; the other end of the clamping member 12 is matched with the outer upper sealing ring 2 or the outer lower sealing ring 9 and pressed.

[0055] In the present invention, the outer upper sealing ring 2 and the outer lower sealing ring 9 are both O-type sealing rings.

[0056] In the utility model, the boss 11.2 at the lower end of the previous cooling pipe section 11 is assembled in the groove at one end of the clamping piece 12, the upper end of the transition cylinder 4 of the air intake device at the other end of the clamping piece 12 is inserted into the clamping piece 12, and the inner wall of the clamping piece 12 presses the outer upper sealing ring 2 of the transition cylinder 4 to achieve the sealing of the cooling pipe section 11; the connection method of the next cooling pipe section 11 with the transition cylinder 4 through the clamping piece 12 is the same as above.

[0057] In the present invention, the clamping member 12 is made of Teflon.

[0058] In the present invention, the cooling pipe section 11 is a split structure, including two pipe section monomers 11.1. The two pipe section monomers 11.1 are spliced ​​to form the cooling pipe section 11, and the clamping parts 12 at both ends play a sealing role for the cooling pipe section 11.

[0059] In the utility model, the lower end of the bottommost cooling pipe section 11 of the optical fiber drawing cooling device is connected with a recovery card 13, and the optical fiber 10 passes through the lower end of the recovery card 13. A connected recovery air pipe 14 is provided on the outside of the recovery card 13, and the gas brought here by the optical fiber 10 is connected to a special recovery device at the recovery card 13 along with the recovery air pipe 14 for recovery. Specifically, the outer end of the recovery air pipe 14 is connected to a vacuum pump. After the vacuum pump is started, the helium at the recovery card 13 is captured through the recovery air pipe.

[0060] In this embodiment, the structure of the recovery card 13 is the same as that of the card connector 12 , except that a connecting hole is provided on the side of the recovery card 13 for connecting the inside of the recovery card 13 with the recovery air pipe 14 .

[0061] The working principle of the optical fiber 10 cooling device in the utility model is as follows: during normal production, the optical fiber 10 moves downward at high speed; helium is introduced into the air intake pipe 1, and the helium enters the sealed air intake cavity 7 in the transition cylinder 4, and enters the interior of the Venturi tube 6 obliquely upward through the air intake hole 6.1.2. Since the upper channel 6.1.1 of the Venturi tube 6 is designed to be a cone with a small upper opening and a large lower opening, the helium is swept upward through the air intake hole 6.1.2 of the upper channel and filled into the cooling pipe section 11, which greatly reduces the amount of helium brought out from the outlet of the optical fiber 10 below the optical fiber 10 that continues to move downward, and a small amount of helium brought into the lower airflow is recovered through the recovery air pipe 14 connected to a special recovery equipment, thereby reducing the loss of helium.

[0062] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0063] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air intake device, characterized in that: It includes air intake duct, transition cylinder and venturi fittings; The outlet end of the air intake duct is in communication with the interior of the transition cylinder; The venturi tube is fixed in the transition cylinder, an air inlet cavity is formed between the outer wall of the venturi tube and the inner wall of the transition cylinder, and the upper and lower parts of the air inlet cavity are sealed; The venturi tube comprises an upper tube section and a lower tube section connected to each other; an upper channel is arranged in the upper tube section; a plurality of air inlet holes connected to the upper channel are opened in the circumferential direction of the lower part of the upper tube section, and the direction of the air inlet holes is inclined upward from the outside to the inside; The lower pipe section of the venturi tube is provided with a lower channel, and the lower channel is coaxially arranged with the upper channel and is connected up and down.

2. The air intake device according to claim 1, characterized in that: The upper channel of the Venturi tube is a tapered channel with a small upper opening and a large lower opening.

3. The air intake device according to claim 1, characterized in that: The upper part of the venturi tube is fixed in the transition cylinder through a through-hole nut, and the through hole of the through-hole nut is coaxial with and communicated with the upper channel of the venturi tube.

4. The air intake device according to claim 3, characterized in that: The outer wall surface of the through hole nut is threadedly connected with the inner wall surface of the transition cylinder; the bottom of the through hole nut is provided with a step hole, which is adapted to the step at the upper end of the venturi pipe fitting.

5. The air intake device according to claim 1, characterized in that: A through hole is provided at the center of the lower end of the transition cylinder, and the through hole at the lower end of the transition cylinder is communicated with the lower opening of the lower channel of the venturi tube.

6. The air intake device according to claim 1, characterized in that: An inner upper sealing ring is provided at the upper part of the air inlet cavity, and the inner upper sealing ring is located at the connection between the through-hole nut and the upper end of the venturi pipe fitting; a step adapted to the outer wall of the lower pipe section of the venturi pipe fitting is provided at the bottom of the venturi pipe fitting, and an inner lower sealing ring is provided at the step.

7. An optical fiber drawing cooling device, characterized in that: The invention comprises a plurality of cooling pipe sections and a plurality of air intake devices as claimed in any one of claims 1 to 6 for introducing helium, wherein the plurality of cooling pipe sections are arranged in sequence from top to bottom; an air intake device is arranged between two upper and lower adjacent cooling pipe sections, the lower end of the upper cooling pipe section is butted against the upper port of the air intake device, the interior of the upper cooling pipe section is communicated with the upper channel of the venturi fitting of the air intake device, the upper end of the next cooling pipe section is butted against the lower through hole of the air intake device, the interior of the next cooling pipe section is communicated with the lower channel of the venturi fitting of the air intake device; the optical fiber passes through each cooling pipe section and each air intake device in sequence from top to bottom.

8. The optical fiber drawing cooling device according to claim 7, characterized in that: The upper end of the transition cylinder of the air intake device is connected to the cooling pipe section through a clamping piece; bosses are respectively provided at both ends of the cooling pipe section, and through holes communicating with the interior of the cooling pipe section are opened on the bosses; an outer upper sealing ring and an outer lower sealing ring are respectively provided on the outer walls of the upper and lower ends of the transition cylinder; a groove matching the boss is provided at one end of the clamping piece, and the other end of the clamping piece is matched with and pressed against the outer upper sealing ring or the outer lower sealing ring.

9. The optical fiber drawing cooling device according to claim 7, characterized in that: The cooling pipe section is a split structure, including two pipe section monomers, and the two pipe section monomers are spliced ​​to form the cooling pipe section.

10. The optical fiber drawing cooling device according to claim 8, characterized in that: The outer upper sealing ring and the outer lower sealing ring are both O-type sealing rings.

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