Multi-stage pressure control plug structure for capillary tube

Abstract

The application provides a multi-stage pressure control plug structure for capillary tubes, which comprises a primary plug body, a secondary plug body and a tertiary plug body which are sequentially sleeved, a secondary sealing ring cover is arranged between the primary plug body and the secondary plug body for sealing, the secondary plug body and the tertiary plug body are provided with a tertiary sealing ring cover for sealing, so as to form a first separation chamber, a second separation chamber and a third separation chamber, a primary capillary tube passes through the secondary sealing ring cover, a secondary capillary tube passes through the tertiary sealing ring cover, the first separation chamber is communicated with a cladding tube, the second separation chamber is communicated with the primary capillary tube, the third separation chamber is communicated with the secondary capillary tube, and the first separation chamber, the second separation chamber and the third separation chamber are each provided with a control air hole, so that the problem that multiple layers of nested capillary tubes are independently connected to positive pressure without leakage is solved.

Description

Technical Field

[0001] This utility model relates to the field of photonic crystal fiber, and in particular to a multi-stage pressure control plug structure for capillary tubes. Background Technology

[0002] Photonic crystal fiber preforms are generally composed of an outer cladding and an inner capillary core layer arranged in a specific pattern. More complex preforms may have an additional layer of capillary tubes nested within the inner capillary tubes. When drawing photonic crystal fibers from these preforms, it is crucial to ensure that the capillary tubes do not collapse, deform, or rupture under high-temperature molten conditions. This requires controlling the micro-positive pressure within each layer of the preform, ensuring stable pressure without any leakage points.

[0003] Since multi-layered nested capillaries require providing positive pressure to each stage of the capillary based on the number of nested layers, there is an urgent need for a plug device that can connect to multi-layered nested capillaries, allowing each capillary to be independently connected to positive pressure. Utility Model Content

[0004] This invention provides a multi-stage pressure control plug structure for capillary tubes, which solves the problem of multi-layer nested capillary tubes being independently connected to positive pressure without leakage.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a multi-stage pressure control plug structure for capillary tubes, comprising a first-stage plug body, a second-stage plug body, and a third-stage plug body sequentially connected. A second-stage sealing ring cap is provided between the first-stage plug body and the second-stage plug body for sealing, and a third-stage sealing ring cap is provided between the second-stage plug body and the third-stage plug body for sealing, thereby forming a first partition chamber, a second partition chamber, and a third partition chamber. The first-stage capillary tube passes through the second-stage sealing ring cap, and the second-stage capillary tube passes through the third-stage sealing ring cap. The first partition chamber is connected to the cladding tube, the second partition chamber is connected to the first-stage capillary tube, and the third partition chamber is connected to the second-stage capillary tube. Each of the first, second, and third partition chambers is provided with a control vent.

[0006] In the preferred embodiment, a first-stage locking nut is provided, which is sleeved on the outside of the multi-layer capillary tube. The first-stage plug body is provided with a second sleeve end, which is threadedly sleeved with the first-stage locking nut.

[0007] In the preferred embodiment, a sealing ring is also fitted on the outside of the multi-layer capillary tube, a bottom stop is provided at the second sleeve end, and a first-level sealing ring is provided between the first-level locking nut and the sealing ring, as well as between the sealing ring and the bottom stop.

[0008] In the preferred embodiment, the primary plug body is provided with a first sleeve end, and a rotatable first fixing ring is also sleeved on the outside of the primary plug body. The secondary plug body is provided with a first external end, and the first fixing ring is threadedly sleeved with the first external end. The first fixing ring is provided with a first concave edge, and a first annular flange is provided on the outside of the first sleeve end. The first annular flange is used to stop the first concave edge.

[0009] In the preferred embodiment, the inner side of the first socket end is provided with a first stop inner edge, and a secondary sealing ring is provided on the first stop inner edge. The inner side of the first outer end is provided with a second stop inner edge. The secondary sealing ring cover is located between the second stop inner edge and the first stop inner edge. A secondary gasket is provided between the secondary sealing ring and the secondary sealing ring cover. The secondary gasket is located between the sealing ring retainer and the secondary sealing ring cover. A secondary capillary sealing ring is provided between the secondary gasket and the primary capillary.

[0010] In the preferred embodiment, the outer side of the third-stage plug body is also fitted with a rotatable second fixing ring, one end of the second-stage plug body is provided with a second external end, the second fixing ring is threadedly connected to the second external end, the second fixing ring is provided with a second inner concave edge, the third-stage plug body is provided with a second annular flange, and the second annular flange is used to stop the second inner concave edge.

[0011] In the preferred embodiment, the inner side of the second external end is provided with a third stop inner edge, the third stop inner edge is provided with a three-level sealing ring, the body of the three-level plug is provided with a fourth stop inner edge, a three-level gasket is also provided between the fourth stop inner edge and the third stop inner edge, the three-level gasket is provided between the three-level sealing ring and the three-level sealing ring cover, and a three-level capillary sealing ring is provided between the three-level gasket and the two-level capillary.

[0012] The beneficial effects of this utility model are as follows: the plug and sealing ring form three independent sealing spaces, which are used to seal the internal spaces of the photonic crystal preform, the first-stage capillary, and the second-stage capillary, respectively. The whole structure is compact as a whole but is sealed to prevent leakage. When gas is introduced into the three spaces from the outside, different pressures can be controlled to ensure the preparation of qualified photonic crystal fibers. This structure can easily increase or decrease the sealing space, thereby achieving sealing of other levels such as two-stage and four-stage structures. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the end section of a multilayer capillary.

[0015] Figure 2 This is a schematic diagram of the middle section of a multilayer capillary.

[0016] Figure 3 It is a cross-sectional view of a multilayer capillary.

[0017] Figure 4 This is a cross-sectional view of the plug structure.

[0018] Figure 5 This is an exploded view of the plug structure.

[0019] Figure 6 This is a schematic diagram of a primary locking nut.

[0020] Figure 7 This is a schematic diagram of the primary plug body.

[0021] Figure 8 This is a structural diagram of the secondary plug body.

[0022] Figure 9 This is a sectional view of the second fixed locking ring.

[0023] In the figure: multilayer capillary 1; cladding tube 101; primary capillary 102; secondary capillary 103; first support tube section 104; second support tube section 105; third support tube section 106; primary plug body 2; first partition chamber 201; first annular flange 202; first sleeve end 203; second sleeve end 204; first stop inner edge 205; bottom stop part 206; primary locking nut 3; primary sealing ring 4; sealing ring retainer 5; first fixing locking ring 6; first inner concave edge 601; secondary sealing ring 7; secondary gasket 8; secondary... 9. Capillary sealing ring; 10. Secondary sealing ring gland; 11. Secondary plug body; 1101. Secondary partition chamber; 1102. First external end; 1103. Second external end; 1104. Inner edge of second stop; 1105. Inner edge of third stop; 12. Tertiary sealing ring; 13. Tertiary gasket; 14. Tertiary capillary sealing ring; 15. Tertiary sealing ring gland; 16. Tertiary plug body; 1601. Third partition chamber; 1602. Second annular flange; 1603. Inner edge of fourth stop; 17. Control vent; 18. Second fixing locking ring; 1801. Detailed Implementation

[0024] Example 1: like Figure 1-9A multi-stage pressure control plug structure for capillary tubes includes a first-stage plug body 2, a second-stage plug body 11, and a third-stage plug body 16 sequentially connected. A second-stage sealing ring cap 10 for sealing is provided between the first-stage plug body 2 and the second-stage plug body 11. A third-stage sealing ring cap 15 for sealing is provided between the second-stage plug body 11 and the third-stage plug body 16, forming a first-stage partition chamber 201, a second-stage partition chamber 1101, and a third-stage partition chamber 1601. A first-stage capillary tube 102 passes through the second-stage sealing ring cap 10, and a second-stage capillary tube 103 passes through the third-stage sealing ring cap 15. The first-stage partition chamber 201 is connected to the cladding tube 101, the second-stage partition chamber 1101 is connected to the first-stage capillary tube 102, and the third-stage partition chamber 1601 is connected to the second-stage capillary tube 103. Each of the first-stage partition chamber 201, the second-stage partition chamber 1101, and the third-stage partition chamber 1601 is provided with a control vent 17.

[0025] The capillary tube is temporarily supported at both ends by the shorter first support tube section 104, second support tube section 105 and third support tube section 106 as shown in the figure. Then, one end of the capillary tube is melted to form a cone shape, and the plug structure in this case is installed at the other end.

[0026] The control gas path outputs a small pressure through microfluidic control technology and is connected to each control gas port 17 through gas tubes and connectors to maintain a stable pressure in the first partition chamber 201, the second partition chamber 1101 and the third partition chamber 1601. Since the first partition chamber 201, the second partition chamber 1101 and the third partition chamber 1601 are divided into independent chambers, different pressures can be provided to them according to process requirements. When the preform is melted, the gas pressure supports the internal space of the cladding tube 101, the primary capillary tube 102 and the secondary capillary tube 103 to prevent the tube wall from collapsing.

[0027] In the preferred embodiment, a primary locking nut 3 is also provided, which is sleeved on the outside of the multi-layer capillary tube 1. The primary plug body 2 is provided with a second sleeve end 204, which is threadedly sleeved with the primary locking nut 3.

[0028] In the preferred embodiment, a sealing ring 5 is also fitted on the outside of the multilayer capillary tube 1, and a bottom stop 206 is provided on the second sleeve end 204. A first-level sealing ring 4 is provided between the first-level locking nut 3 and the sealing ring 5, as well as between the sealing ring 5 and the bottom stop 206.

[0029] The primary locking nut 3 is rotated to compress the primary sealing ring 4 and the sealing ring retainer 5 between the primary sealing ring 4 and the bottom stop 206. The primary sealing ring 4 forms two seals on the outside of the multilayer capillary tube 1.

[0030] In the preferred embodiment, the primary plug body 2 is provided with a first sleeve end 203, and a rotatable first fixing ring 6 is also sleeved on the outside of the primary plug body 2. The secondary plug body 11 is provided with a first external end 1102, and the first fixing ring 6 is threadedly sleeved with the first external end 1102. The first fixing ring 6 is provided with a first concave edge 601, and a first annular flange 202 is provided on the outside of the first sleeve end 203. The first annular flange 202 is used to stop the first concave edge 601.

[0031] In the preferred embodiment, the inner side of the first socket end 203 is provided with a first stop inner edge 205, and a secondary sealing ring 7 is provided on the first stop inner edge 205. The inner side of the first outer end 1102 is provided with a second stop inner edge 1104. The secondary sealing ring cover 10 is located between the second stop inner edge 1104 and the first stop inner edge 205. A secondary gasket 8 is provided between the secondary sealing ring 7 and the secondary sealing ring cover 10. The secondary gasket 8 is located between the sealing ring retainer 5 and the secondary sealing ring cover 10. A secondary capillary sealing ring 9 is provided between the secondary gasket 8 and the primary capillary 102.

[0032] After the primary plug body 2 and the secondary plug body 11 are aligned, the first external end 1102 is inserted into the first socket end 203. The first fixing locking ring 6 is rotated, and the secondary plug body 11 is pulled towards the primary plug body 2. Under the squeezing force of the two sides of the secondary gasket 8 and the inner edge of the second stop 1104 and the inner edge of the first stop 205, the sealing ring retainer 5 and the secondary sealing ring cover 10 are gradually pressed together, completing the two seals.

[0033] In the preferred embodiment, a rotatable second fixing ring 18 is also fitted on the outer side of the third-stage plug body 16. One end of the second-stage plug body 11 is provided with a second external end 1103. The second fixing ring 18 is threadedly connected to the second external end 1103. The second fixing ring 18 is provided with a second inner concave edge 1801. The third-stage plug body 16 is provided with a second annular flange 1602. The second annular flange 1602 is used to stop the second inner concave edge 1801.

[0034] In the preferred embodiment, the inner side of the second external end 1103 is provided with a third stop inner edge 1105, and a third-level sealing ring 12 is provided on the third stop inner edge 1105. The third-level plug body 16 is provided with a fourth stop inner edge 1603. A third-level gasket 13 is also provided between the fourth stop inner edge 1603 and the third stop inner edge 1105. The third-level gasket 13 is located between the third-level sealing ring 12 and the third-level sealing ring cover 15. A third-level capillary sealing ring 14 is provided between the third-level gasket 13 and the second-level capillary 103.

[0035] After the secondary plug body 11 and the tertiary plug body 16 are aligned, the second external end 1103 is inserted into the second fixing ring 18. The second fixing ring 18 is rotated to press the tertiary sealing ring 12 and the tertiary sealing ring cover 15 to form two seals.

[0036] Example 2: A multi-stage capillary plug mechanism includes a primary plug body, a primary locking nut, a primary sealing ring, a primary sealing retaining ring, a fine-thread fixing nut, a secondary sealing ring, a secondary gasket, a secondary capillary sealing ring, a secondary sealing ring gland, a secondary plug body, a tertiary sealing ring, a tertiary gasket, a tertiary capillary sealing ring, a tertiary sealing ring gland, and a tertiary plug body.

[0037] The primary plug body and the primary locking nut are connected by fine thread. Tightening the primary locking nut will compress the primary sealing ring and the primary sealing ring, so that the primary sealing ring can seal the outer cladding. The above parts constitute the primary seal of the plug, which is used to seal the space of the outer cladding. The primary plug body and the secondary plug body are connected together by a fixing nut. The secondary gasket and the secondary sealing ring cover are used to fix the primary capillary tube. The primary capillary tube will pass through the aforementioned secondary gasket and the secondary sealing ring cover. The secondary sealing ring and the secondary capillary sealing ring seal the gap between the capillary tube and the secondary gasket. The above parts constitute the second-level seal of the plug, which is used to seal the internal space of the primary capillary tube.

[0038] The secondary plug body and the tertiary plug body are connected together by a fixing nut. The tertiary gasket and the tertiary sealing ring are used to fix the secondary capillary tube. The secondary capillary tube will pass through the above-mentioned parts. The tertiary sealing ring and the tertiary capillary sealing ring seal the gap between the capillary tube and the tertiary gasket. The above-mentioned parts constitute the third-level seal of the plug, which is used to seal the internal space of the secondary capillary tube.

[0039] Insert the first-stage locking nut, first-stage sealing ring, and sealing ring retainer ring into the outermost layer of the multi-layer capillary tube in sequence, and then insert the first-stage plug body; then tighten the first-stage locking nut and the first-stage plug body. At this point, the first-stage plug installation is complete. Install the secondary sealing ring on the primary plug body, then install the secondary gasket, and then fit the primary capillary sealing ring and the secondary sealing ring gland. After the above steps are completed, fit the secondary plug body onto the primary plug body and press the plug body against the gland. Finally, tighten the fixing nut to make the primary plug body and the secondary plug body firmly connected. At this time, the assembly of the secondary plug is completed.

[0040] Similarly, install the tertiary sealing ring, tertiary gasket, secondary capillary sealing ring, and tertiary sealing ring gland onto the secondary plug body in sequence, then fit the tertiary plug body onto it, tighten the fixing nut, and the tertiary plug installation is complete.

[0041] The sealing ring is generally made of fluororubber or fluoroelastomer rubber because the plug works in a high-temperature environment. Fluororubber can work at temperatures up to 250°C, and both materials can meet the overall requirements.

[0042] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A capillary tube multi-stage pressure control plug structure, characterized in that: The device includes a primary plug body (2), a secondary plug body (11), and a tertiary plug body (16) sequentially connected. A secondary sealing ring cap (10) is provided between the primary plug body (2) and the secondary plug body (11) for sealing, and a tertiary sealing ring cap (15) is provided between the secondary plug body (11) and the tertiary plug body (16) for sealing, to form a first partition chamber (201), a second partition chamber (1101), and a third partition chamber (1601). (102) Passing through the secondary sealing ring cover (10), the secondary capillary (103) passes through the tertiary sealing ring cover (15), the first partition chamber (201) is connected to the cladding tube (101), the second partition chamber (1101) is connected to the primary capillary (102), and the third partition chamber (1601) is connected to the secondary capillary (103). The first partition chamber (201), the second partition chamber (1101) and the third partition chamber (1601) are each provided with a control vent (17).

2. The multi-stage pressure control plug structure for capillary tubes according to claim 1, characterized in that: It is also provided with a first-level locking nut (3), which is sleeved on the outside of the multi-layer capillary tube (1). The first-level plug body (2) is provided with a second sleeve end (204), which is threadedly sleeved with the first-level locking nut (3).

3. The multi-stage pressure control plug structure for capillary tubes according to claim 2, characterized in that: The outer side of the multilayer capillary tube (1) is also fitted with a sealing ring (5), the second sleeve end (204) is provided with a bottom stop (206), and a first-level sealing ring (4) is provided between the first-level locking nut (3) and the sealing ring (5) and between the sealing ring (5) and the bottom stop (206).

4. The multi-stage pressure control plug structure for capillary tubes according to claim 1, characterized in that: The primary plug body (2) is provided with a first sleeve end (203), and a rotatable first fixing lock ring (6) is also sleeved on the outside of the primary plug body (2). The secondary plug body (11) is provided with a first external end (1102), and the first fixing lock ring (6) is threadedly connected to the first external end (1102). The first fixing lock ring (6) is provided with a first inner concave edge (601), and a first annular flange (202) is provided on the outside of the first sleeve end (203). The first annular flange (202) is used to stop the first inner concave edge (601).

5. The multi-stage pressure control plug structure for capillary tubes according to claim 4, characterized in that: The first socket (203) has a first stop inner edge (205) on its inner side, and a secondary sealing ring (7) is provided on the first stop inner edge (205). The first outer socket (1102) has a second stop inner edge (1104) on its inner side. The secondary sealing ring cover (10) is located between the second stop inner edge (1104) and the first stop inner edge (205). A secondary gasket (8) is provided between the secondary sealing ring (7) and the secondary sealing ring cover (10). The secondary gasket (8) is located between the sealing ring retainer (5) and the secondary sealing ring cover (10). A secondary capillary sealing ring (9) is provided between the secondary gasket (8) and the primary capillary (102).

6. The multi-stage pressure control plug structure for capillary tubes according to claim 1, characterized in that: The outer side of the third-stage plug body (16) is also fitted with a rotatable second fixing ring (18). One end of the second-stage plug body (11) is provided with a second external end (1103). The second fixing ring (18) is threadedly connected to the second external end (1103). The second fixing ring (18) is provided with a second inner concave edge (1801). The third-stage plug body (16) is provided with a second annular flange (1602). The second annular flange (1602) is used to stop the second inner concave edge (1801).

7. The multi-stage pressure control plug structure for capillary tubes according to claim 6, characterized in that: The inner side of the second external end (1103) is provided with a third stop inner edge (1105), and a third-level sealing ring (12) is provided on the third stop inner edge (1105). The third-level plug body (16) is provided with a fourth stop inner edge (1603). A third-level gasket (13) is also provided between the fourth stop inner edge (1603) and the third stop inner edge (1105). The third-level gasket (13) is located between the third-level sealing ring (12) and the third-level sealing ring cover (15). A third-level capillary sealing ring (14) is provided between the third-level gasket (13) and the second-level capillary (103).

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