Blow burner mechanism for OVD process, deposition equipment and control method

Abstract

The invention relates to a blowtorch mechanism for an OVD process, deposition equipment and a control method, the blowtorch mechanism comprises a plurality of blowtorch rows, and each blowtorch row comprises a plurality of blowtorches distributed at equal intervals. According to the invention, the distribution diameter of the working gas at the outermost ring of the blowtorch, the radius of the powder rod corresponding to the flame drop point of the blowtorch on the powder rod, and the equally divided number and included angle of the distance L1 between the flame drop points of two vertically adjacent blowtorches in the blowtorch row on the powder rod are introduced; calculating the value of the distance L2 between the flame drop points of the nearest two blowtorches in the two adjacent blowtorch rows on the powder rod and the value of the distance L3 between the flame drop points of the nearest two blowtorches in the two adjacent blowtorch rows on the powder rod, and limiting the values of the distances L1, L2 and L3 between the flame drop points of the upper and lower adjacent blowtorches in the blowtorch rows on the powder rod; and flame interference and mutual influence among the blowtorches can be avoided, so that the collection rate is increased, the deposition rate is increased, and the deposition time is shortened.

Description

Technical Field

[0001] The present application relates to the field of communication optical fiber manufacturing, and in particular to a blowtorch mechanism, deposition equipment and control method for an OVD process. Background Art

[0002] The most mainstream process flow for manufacturing optical fiber preforms is to use the VAD process to manufacture the core rod and the OVD process to manufacture the cladding. In the cladding manufacturing process, OVD traditionally uses a single row of torches to deposit on a single core rod. As the preform is deposited, its outer diameter becomes larger and larger, the deposition time becomes longer and longer, and the process becomes more and more difficult. Therefore, a technology of using multiple rows of torches to deposit on a single core rod has been gradually developed. When multiple rows of torches are deposited on a single core rod, flames easily interfere with each other, causing unstable airflow and the inability of the flame to spray according to the ideal flow field, which in turn makes it difficult to proceed with deposition production or significantly reduces the collection rate. Summary of the invention

[0003] The embodiments of the present application provide a blowtorch mechanism, deposition equipment and control method for an OVD process to solve the problem of flame interference and fighting between blowtorches in the related art, thereby improving the collection rate and shortening the deposition time.

[0004] In a first aspect, a blowtorch mechanism for an OVD process is provided, comprising:

[0005] A plurality of torch arrays, each of the torch arrays comprising a plurality of torches distributed at equal intervals;

[0006] One of the three vertical planes passing through the central axis of the powder rod is a first plane, and the other two are second planes and are symmetrically arranged on both sides of the first plane. The torch array is arranged on the second plane, and the central axis of each torch is perpendicular to the central axis of the powder rod;

[0007] Each of the torch arrays satisfies a first condition, wherein the first condition includes:

[0008] L 1 ≥4D 0 , L 2 ≥4D 0 ;

[0009]

[0010] Among them, L 1 The distance between the flame points of two adjacent torches in the torch array on the powder rod;

[0011] L 2 is the distance between the flame points of the two nearest torches in two adjacent torch rows on the powder rod;

[0012] D 0 is the distribution diameter of the working gas in the outermost circle of the blowtorch;

[0013] α is the angle between the first plane and the second plane;

[0014] r is the radius of the powder rod corresponding to the point where the flame of the blowtorch falls on the powder rod;

[0015] n is the projection of the flame point of one torch array onto the straight line formed by the flame point of the other torch array in two adjacent torch arrays. 1 The number of equal parts.

[0016] In some embodiments, L 1 ≤8D 0 , L 2 ≤8D 0 .

[0017] In some embodiments, the value range of α is α≤35°.

[0018] In some embodiments, 20°≤α≤35°.

[0019] In some embodiments, the torch array is arranged on the first plane;

[0020] The first condition also includes:

[0021] L 3 ≥4D 0 ,

[0022] Among them, L 3 It is the distance between the flame landing points of the two nearest torches in the two alternate rows of torches on the powder rod.

[0023] In some embodiments, L 3 ≤8D 0 .

[0024] In some embodiments, the torch columns located on the two second planes are aligned.

[0025] In a second aspect, a deposition device is provided, which includes a blowtorch mechanism for an OVD process as described above.

[0026] In a third aspect, a control method for a blowtorch mechanism for an OVD process as described above is provided, comprising:

[0027] Turning on each of the torches in one of the torch arrays;

[0028] Real-time measurement of the radius of the powder rod to calculate L 2 ;

[0029] If L 2 ≥4D 0 , then turn on each of the torches in another torch array.

[0030] In a fourth aspect, a control method for a blowtorch mechanism for an OVD process as described above is provided, comprising:

[0031] Turning on each of the torches in the torch array on the first plane;

[0032] Real-time measurement of the radius of the powder rod to calculate L 2 and L 3 ;

[0033] If L 2 ≥4D 0 , and L 3 ≥4D 0 , then turn on each of the torches in the torch array on the second plane.

[0034] The beneficial effects of the technical solution provided by this application include:

[0035] The embodiment of the present application provides a torch mechanism, deposition equipment and control method for an OVD process. The present application introduces a distribution diameter D of the working gas at the outermost circle of the torch. 0 , the radius r of the powder rod corresponding to the flame landing point of the blowtorch on the powder rod, and the distance L between the flame landing points of two adjacent blowtorches in the blowtorch array on the powder rod 1 The number of equal parts n and the angle α to calculate L 2 The value of L 1 , L 2 The value of can avoid the flame interference between the blowtorches, thereby improving the collection rate, increasing the deposition rate and shortening the deposition time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of the arrangement of a blowtorch mechanism provided in an embodiment of the present application (two columns);

[0038] Figure 2 for Figure 1 A top view of

[0039] Figure 3 A schematic diagram of a blowtorch provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the arrangement of a blowtorch mechanism provided in an embodiment of the present application (three columns);

[0041] Figure 5 for Figure 4 Top view of the .

[0042] In the figure: 1, blowtorch; 2, powder stick; 3, first plane; 4, second plane. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] See also Figure 1 , Figure 2 , Figure 3 As shown, the embodiment of the present application provides a torch mechanism for an OVD process, which includes a plurality of torch arrays, each of which includes a plurality of torches 1 distributed at equal intervals; for example, Figure 1 Medium 1 Point, P 2 Point, P 3 Point, P 4 Point, P 5 Point is the flame landing point formed by each blowtorch 1 on the powder rod 2, P 1 Point, P 3 Point, P 5 The points form a blowtorch array, P 2 Point, P 4 The dots form another blowtorch column.

[0045] One of the three vertical planes passing through the central axis of the powder rod 2 is a first plane 3, and the other two are second planes 4 and are symmetrically arranged on both sides of the first plane 3. The torch array is arranged on the second plane 4, and the central axis of each of the torches 1 is perpendicular to the central axis of the powder rod 2; each of the torch arrays meets the first condition, which includes:

[0046] 4D 0 ≤L 1 ≤8D 0 , 4D 0 ≤L 2 ≤8D 0 ;

[0047]

[0048] Among them, L 1 is the distance between the flame points of two adjacent torches 1 in the torch array on the powder rod 2; see Figure 1 As shown, P 1 Point and P 3 The spacing of points, P 3 Point and P 5 The spacing of points, P 2 Point and P 4 The distance between the points is L 1 .

[0049] L 2 is the distance between the flame points of the two nearest torches 1 in the two adjacent torch rows on the powder rod 2; see Figure 1 As shown, since the powder rod 2 is cylindrical, L 2 For a spiral curve, such as P 1 Point and P 2 The spacing of the points, P 3 Point and P 4 The distance between the points is L 1 .

[0050] See also Figure 3 As shown, D 0 is the distribution diameter of the working gas in the outermost circle of the blowtorch 1;

[0051] See also Figure 2 As shown, α is the angle between the first plane 3 and the second plane 4;

[0052] See also Figure 2 As shown, r is the radius of the powder rod 2 corresponding to the flame landing point of the blowtorch 1 on the powder rod 2;

[0053] n is the projection of the flame point of the torch 1 in one of the two adjacent torch arrays onto the straight line formed by the flame point of the torch 1 in the other torch array. 1 The number of equal divisions, n is a positive integer. The value range of n is preferably 1≤n≤2.

[0054] It is understood that in the present application, the burners 1 of two adjacent burner arrays may be staggered in the vertical direction so that the flame points are staggered, for example, see Figure 1 As shown, P 1 Point, P 3 Point, P 5 Point and P 2 Point, P 4 The points are staggered in the vertical direction so that P 2 The height of the point is P 1 Point, P 3 Between points, P4 The height of the point is P 3 Point, P 4 The points can also be aligned and staggered. This alignment or staggered distribution allows n to take different values.

[0055] For example, if the distribution is aligned, then L 1 is divided into one equally, that is, n=1.

[0056] For example, if the distribution is staggered, it can be divided into two equal parts, three equal parts, etc. For example, see Figure 1 As shown, P 2 Point at P 1 Point, P 3 Point, P 5 The projection of the point onto the straight line will be L 1 Divide into two equally, that is, n=2.

[0057] It is understandable that the number of torches in each torch array may be the same or different, and the number of torches in each torch array may be the same or different. 1 and L between the columns of blowtorches 1 equal.

[0058] Among them, the size of α needs to be optimized. If α is too small, basically after finishing one stick, the condition for starting the second row of blowtorches cannot be met. If α is too large, the situation of airflow blowing the flame is more serious, and the flame should follow the airflow of the cavity. Comprehensively considered, the value range of α is α≤35°, preferably, 20°≤α≤35°.

[0059] It is understandable that the above is 4D 0 As the condition for opening the blowtorch, if the value is lower than this, the two columns of blowtorch will interfere with each other when they are opened at the same time. The above further limits it to less than 8D 0 In fact, it can continue to work normally without the flames interfering with each other. However, if the spacing is too large, the space utilization rate of the equipment will be reduced. Therefore, the spacing is limited to less than 8D. 0 , making better space utilization of the equipment.

[0060] It can be understood that the various torch arrays are usually arranged on the same cylindrical surface, with the powder rod 2 as the central axis of the cylindrical surface.

[0061] See also Figure 4 and Figure 5 As shown, further, the torch array is arranged on the first plane 3; the first condition also includes:

[0062] 4D 0 ≤L 3 ≤8D 0 ,

[0063] Among them, L 3 is the distance between the flame points of the two nearest torches 1 in the two torch rows in the alternate row on the powder rod 2, see Figure 4 As shown, since the powder rod 2 is cylindrical, L 3 For a curve, such as P 6 Point and P 2 The spacing of points, P 7 Point and P 4 The distance between the points is L 3 .

[0064] Furthermore, the torch arrays located on the two second planes 4 are aligned and arranged, as shown in FIG. Figure 4 As shown, P 6 Point and P 2 The height of the points is consistent, P 7 Point and P 4 The points are of the same height.

[0065] Furthermore, an embodiment of the present application also provides a deposition device, which includes a blowtorch mechanism for the OVD process as described above.

[0066] Furthermore, the embodiment of the present application also provides a control method for a torch mechanism for an OVD process, which method is applicable to a case where two torch arrays are provided, and specifically, includes:

[0067] 101: Turn on each of the torches 1 of one of the torch arrays.

[0068] 102: Real-time measurement of the radius of the powder stick 2 to calculate L 2 .

[0069] 103: If L 2 ≥4D 0 , then turn on each of the torches 1 of another torch array.

[0070] Furthermore, the embodiment of the present application also provides a control method for a burner mechanism for an OVD process, which method is applicable to a case where there are three burner arrays, and specifically, includes:

[0071] 201 : Turn on each of the torches 1 in the torch array on the first plane 3 .

[0072] 202: Real-time measurement of the radius of the powder stick 2 to calculate L 2 and L 3 .

[0073] 203: If L 2 ≥4D 0 , and L 3 ≥4D 0 , then turn on each of the torches 1 in the torch array on the second plane 4.

[0074] Specifically, each torch 1 of the torch array on the first plane 3 is turned on, and the radius of the powder rod 2 is measured in real time to calculate L 2 , when L 2 ≥4D 0 , then turn on each torch 1 of the torch array on one of the second planes 4; measure the radius of the powder rod 2 in real time to calculate L 3 , when L 3 ≥4D 0 , then turn on each of the torches 1 in another torch row on the second plane 4 .

[0075] Embodiment 1:

[0076] See also Figure 4 and Figure 5 As shown in Table 1 below, the L under various conditions is shown in Table 1 below. The L under various conditions is shown in Table 1 below. The L under various conditions is shown in Table 1 below. The L under various conditions is shown in Table 1 below. The L under various conditions is shown in Table 1 below. 1 , L 2 and L 3 According to this result, combined with the working gas distribution diameter (D 0 =38mm, 4D 0 =152mm), select L 1 =300mm, angle α = 30°, when the powder rod r = 150mm, L 2 =158.9mm, L 3 =157mm, so that L 1 , L 2 and L 3 All greater than or equal to 4D 0 At this time, the two rows of blowtorches on the side can be turned on. At this time, the distance between any two blowtorches in the three rows is greater than 4D. 0 At any time after exceeding this diameter, the torch should increase the power without flame interference. The ratio of the surface area of ​​the heating zone in all torch working conditions is calculated according to the following formula. At this time, the ratio of the surface area of ​​the heating zone reaches 24.7% when all torches start working, and gradually decreases to 20.7% when the deposition ends.

[0077]

[0078] Table 1

[0079]

[0080] Embodiment 2:

[0081] See also Figure 1 and Figure 2As shown in Table 2 below, the L under various conditions is shown when two rows of torches are arranged alternately and the lamp spacing is divided equally (i.e., n=2). 1 , L 2 According to this result, combined with the working gas distribution diameter (D 0 =38mm, 4D 0 =152mm), select L 1 =250mm, angle α = 30°, when the powder rod r = 165mm, L 2 =151.9mm≈152mm, so that L 1 , L 2 All greater than or equal to 4D 0 At this time, you can turn on the blowtorch on the side. At this time, the distance between any two blowtorches in the two columns is greater than 4D. 0 . At any time after exceeding this diameter, the torch will not have flame interference. According to the above formula, the proportion of the surface area of ​​the heating zone in all working conditions of the torch is calculated. At this time, the proportion of the surface area of ​​the heating zone reaches 15.6% when all torches start working, and slowly decreases to 10.4% when the deposition ends. As the diameter of the powder rod increases, the power of the torch needs to be gradually increased, but it will not cause the occurrence of flame interference.

[0082] Table 2

[0083]

[0084] Embodiment three:

[0085] Table 3 below shows the L under various conditions when two rows of torches are arranged side by side (n=1). 2 According to this result, combined with the working gas distribution diameter (D 0 =38mm, 4D 0 =152mm), select angle α=35°, then the second row of torches can be turned on when the powder rod r=250mm, at this time the distance between any two torches in the two rows is greater than 4D 0 , at any time after exceeding this diameter, the torches will not have flame interference. However, at this time, the diameter of the powder rod is too large, basically at the end of the deposition stage, and will not contribute more to the entire production process. Therefore, it can be concluded that this plan of side-by-side distribution of torches is not feasible.

[0086] Table 3

[0087]

[0088] This application introduces the distribution diameter D of the working gas in the outermost circle of the blowtorch 0, the radius r of the powder rod corresponding to the flame landing point of the blowtorch on the powder rod, and the distance L between the flame landing points of two adjacent blowtorches in the blowtorch array on the powder rod 1 The number of equal parts n and the angle α to calculate L 2 and L 3 The value of L 1 , L 2 and L 3 The value of can avoid the flame interference between the blowtorches, thereby improving the collection rate, increasing the deposition rate and shortening the deposition time.

[0089] According to L 1 , L 2 and L 3 The value is judged, if it does not meet the requirements and is greater than or equal to 4D 0 , you can turn on the blowtorch at different times.

[0090] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0091] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0092] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A blowtorch mechanism for an OVD process, characterized in that: It includes: A plurality of torch arrays, each of the torch arrays comprising a plurality of torches (1) distributed at equal intervals; One of the three vertical planes passing through the central axis of the powder rod (2) is a first plane (3), and the other two are second planes (4) and are symmetrically arranged on both sides of the first plane (3); the second plane (4) is provided with the torch array, and the central axis of each of the torches (1) is perpendicular to the central axis of the powder rod (2); Each of the torch arrays satisfies a first condition, wherein the first condition includes: L1≥4D0, L2≥4D0; Wherein, L1 is the distance between the flame points of two upper and lower adjacent burners (1) in the burner array and the powder rod (2); L2 is the distance between the flame points of the two nearest torches (1) in two adjacent torch rows and the powder rods (2); D0 is the distribution diameter of the working gas in the outermost circle of the blowtorch (1); α is the angle between the first plane (3) and the second plane (4); r is the radius of the powder rod (2) corresponding to the point where the flame of the blowtorch (1) falls on the powder rod (2); n is the number of equal parts of L1 when the flame points of the torches (1) of one torch row are projected onto the straight line formed by the flame points of the torches (1) of the other torch row in two adjacent torch rows.

2. The blowtorch mechanism for OVD process as claimed in claim 1, characterized in that: L1≤8D0, L2≤8D0.

3. The blowtorch mechanism for OVD process as claimed in claim 1, characterized in that: The value range of α is α≤35°.

4. The blowtorch mechanism for OVD process as claimed in claim 3, characterized in that: 20°≤α≤35°。 5. The blowtorch mechanism for OVD process as claimed in claim 1, characterized in that: The torch array is arranged on the first plane (3); The first condition also includes: L3≥4D0, Wherein, L3 is the distance between the flame points of the two nearest burners (1) in the two alternate burner rows and the powder rods (2).

6. The blowtorch mechanism for OVD process as claimed in claim 5, characterized in that: L3≤8D0.

7. The blowtorch mechanism for OVD process as claimed in claim 5, characterized in that: The columns of torches located on the two second planes (4) are aligned.

8. A deposition device, characterized in that: It comprises a blowtorch mechanism for an OVD process as claimed in any one of claims 1 to 7.

9. A method for controlling a blowtorch mechanism for an OVD process as claimed in claim 1, characterized in that: It includes: Turning on each of the torches (1) of one of the torch arrays; The radius of the powder rod (2) is measured in real time to calculate L2; If L2≥4D0, each torch (1) of another torch array is turned on.

10. A method for controlling a blowtorch mechanism for an OVD process as claimed in claim 5, characterized in that: It includes: Turning on each of the torches (1) in the torch array on the first plane (3); Real-time measurement of the radius of the powder rod (2) to calculate L2 and L3; If L2≥4D0 and L3≥4D0, each torch (1) in the torch array on the second plane (4) is turned on.

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