Four-spiral silicon carbide rod

Abstract

The utility model provides a four-spiral silicon carbide rod, relates to the technical field of high-temperature components, solves the problem of low heating efficiency of a silicon carbide rod in use in the prior art, and comprises a heating part, the heating part is provided with four first slots in a spiral extending manner along the axis direction, and the four first slots are arranged on the heating part. Each first open slot is uniformly wound along the axis direction of the heating part; the conductive part is coaxially connected with the heating part, two second open grooves are formed in the conductive part in the axis direction in an opposite mode, and the conductive part is divided into semicircular arc bodies with the same shape through the two second open grooves; and the insulating sleeving piece is arranged on the side, far away from the heating part, of the conductive part in a sleeving manner and is used for surrounding and wrapping the conductive part and isolating current conduction between the conductive part and a power supply from the outside. Compared with the prior art, the heating device has the advantage of higher heating efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature components, in particular to a quad-helix silicon-carbon rod. Background Art

[0002] Silicon carbon rods are a material composed of silicon and carbon elements. They are usually used in high-temperature applications, such as electrodes in electric arc furnaces and melting furnaces. Silicon carbon rods have excellent high-temperature resistance and chemical stability, and can work under extreme conditions, so they are widely used in metallurgy, chemical industry and other industrial fields. In electric arc furnaces, silicon carbon rods are used as electrodes to conduct current and generate high temperatures to melt metals. They can withstand arc erosion and chemical erosion at high temperatures and have a long service life. At the same time, silicon carbon rods have good electrical conductivity and can effectively convert electrical energy into thermal energy. In addition to industrial applications, silicon carbon rods can also be used in some special scientific research experiments and high-temperature reactions, such as laboratory melting, chemical vapor deposition, etc. Due to its stability and high-temperature resistance, silicon carbon rods also play an important role in these fields.

[0003] At present, the double-helix silicon carbon rod is commonly used. The double-helix silicon carbon rod has two parallel spiral grooves at the conductive end of the hollow silicon carbon rod. However, since the double-helix silicon carbon rod heats up slowly during use and requires a high voltage for heating, the existing silicon carbon rod has low heating efficiency during use. Utility Model Content

[0004] The utility model aims to design a four-helix silicon carbon rod, which can improve the problem of low heating efficiency of the silicon carbon rod when in use.

[0005] The utility model is realized by the following technical solutions:

[0006] A quadruple helix silicon carbon rod, comprising:

[0007] A heating part, wherein the heating part is provided with a first slot extending spirally along the axial direction, wherein four first slots are provided, and each first slot is evenly wound along the axial direction of the heating part;

[0008] A conductive part is coaxially connected to the heating part, and the conductive part is provided with two second slots along the axial direction, and the two second slots divide the conductive part into semicircular arcs of the same shape;

[0009] The insulating sleeve is sleeved on the side of the conductive part away from the heating part, and is used to surround and cover the conductive part while isolating the current conduction between the conductive part and the power source from the outside world.

[0010] Optionally, the first ends of the four first slots are located on the same cross section of the heat generating portion; and / or,

[0011] The ends of the four first slots are located on the same cross section of the heat generating portion.

[0012] Optionally, an angle between an extension line formed by the first groove on the side of the heat-generating portion and a cross section of the heat-generating portion is greater than or equal to 30°.

[0013] Optionally, the spiral pitch between two adjacent first grooves is at least 4 times the groove width of the first groove.

[0014] Optionally, one end of the second slot is connected to an end of one of the first slots.

[0015] Optionally, the insulating sleeve comprises:

[0016] At least two insulating parts are provided in close contact with the conductive part in the circumferential direction;

[0017] The wrapping portion is sleeved on the periphery of the plurality of insulating portions so that the plurality of insulating portions are evenly distributed in the circumferential direction of the conductive portion, and the wrapping portion itself can undergo elastic deformation.

[0018] Optionally, the number of the insulating parts is set to 4.

[0019] Optionally, gaps are formed between adjacent insulating portions, wherein two radially opposite gaps are opposite to two second slots respectively.

[0020] Optionally, the insulating portion has an outer curved surface and an inner curved surface; wherein,

[0021] The curvature of the inner curved surface matches the curvature of the outer periphery of the conductive portion;

[0022] The outer arc surface is located on the insulating part at a position away from the inner arc surface. Both sides of the outer arc surface are provided with protrusions, and a locking groove for the wrapping part to be placed is formed between the two protrusions.

[0023] Optionally, a plurality of holes are formed on the circumferential surface of the wrapping portion.

[0024] The utility model has the following advantages and beneficial effects:

[0025] 1. Since there are four first slots on the quad-helix silicon carbon rod, that is, under the same opening area, the resistance on the surface of the heating part will be smaller than that of the double-helix silicon carbon rod. Therefore, when the quad-helix silicon carbon rod is heated, the quad-helix silicon carbon rod will heat faster and more efficiently than the double-helix silicon carbon rod under the same voltage.

[0026] 2. Since the four-helix silicon carbon rod is placed vertically during use, when the heating temperature is above 1000°C, the surface of the four-helix silicon carbon rod will expand and contract due to heat and cold, and the four-helix silicon carbon rod may sag due to its own gravity, causing the rod body to break and be damaged. On this basis, the angle between the extension line formed by the first slot on the side of the heating part and the cross section of the heating part is set to be greater than or equal to 30°, and the spiral pitch of the first slot is set to at least 4 times the slot width of the first slot, so that the four-helix silicon carbon rod is not easy to sag during heating and use, similar to a stretched spring, and thus the four-helix silicon carbon rod is not easy to break and be damaged during use;

[0027] 3. The four insulating parts are wrapped around the conductive part in the circumferential direction through the wrapping part, and the surrounding wrapping degree can be flexibly adjusted when the conductive part expands or contracts due to heat, so that the insulating sleeve is not easy to loosen or break, thereby improving the adaptability of the insulating sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a front view of an embodiment of the present application;

[0030] Figure 2 is a cross-sectional schematic diagram for illustrating a heating portion in an embodiment of the present application;

[0031] Figure 3 is a cross-sectional schematic diagram for illustrating a conductive portion in an embodiment of the present application;

[0032] Figure 4 It is a schematic diagram of the structure of an embodiment of the present application;

[0033] Figure 5 yes Figure 4 A magnified view of part A in FIG.

[0034] Figure 6 It is a cross-sectional schematic diagram for illustrating the connection relationship between the insulating sleeve and the conductive part of an embodiment of the present application.

[0035] The markings in the figure are:

[0036] 100, heating part; 110, first slot; 200, conductive part; 210, second slot; 300, insulating sleeve; 310, insulating part; 311, outer arc surface; 3110, protrusion; 3120, locking slot; 312, inner arc surface; 320, wrapping part; 321, hole body. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0038] In the description of the present utility model, it should be noted that, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or component 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 utility model. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] The technical solutions disclosed in various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0041] In the relevant technology, silicon carbon rods have high operating temperatures, and are resistant to high temperatures, oxidation, corrosion, fast heating, long life, small deformation at high temperatures, easy installation and maintenance, and have good chemical stability. When matched with an automated electronic control system, it can obtain an accurate constant temperature, and can automatically adjust the temperature according to the curve as required by the production process. Using silicon carbon rods for heating is convenient, safe and reliable. It is now widely used in high-temperature fields such as electronics, magnetic materials, powder metallurgy, ceramics, glass, semiconductors, analytical testing, scientific research, etc., and has become an electric heating element for tunnel kilns, roller kilns, glass kilns, vacuum furnaces, muffle furnaces, smelting furnaces and various heating equipment. At present, there are double-helix silicon carbon rods on the market, but the resistance of double-helix silicon carbon rods is relatively large, and a voltage of 220V is required to reach 900-1000 degrees Celsius. Not only is the voltage required for heating high, but the heating efficiency is also low.

[0042] For the above problems, refer to Figures 1 to 6 The embodiment of the present application provides a four-helix silicon carbon rod, which has the advantage of improving the heating efficiency of the silicon carbon rod when in use.

[0043] like Figure 1 As shown, the quadruple-helix silicon carbon rod disclosed in the embodiment of the present application includes a heating portion 100, a conductive portion 200 and an insulating sleeve 300. The heating portion 100 and the conductive portion 200 are actually an integrated coaxial connection structure, and the two are respectively part of a separate cylindrical silicon carbon rod, wherein:

[0044] The heating portion 100 is provided with a first slot 110 extending spirally along the axial direction. Figure 2 , Figure 3Exemplarily, there are four first slots 110, and the four first slots 110 are spirally wound on the surface of the heating part 100, that is, each first slot 110 is evenly wound along the axial direction of the heating part 100. Under the same opening area, compared with the two slots on the double-helix silicon carbon rod, the arrangement of the four first slots 110 will increase the number of branches after the slot body is opened on the surface of the heating part 100 and make the slot body thinner, so that the resistance on the surface of the heating part 100 is smaller, and then under the same voltage, the heating speed of the heating part 100 of the present application is faster and more efficient. In a further embodiment, the conductive part 200 is provided with two second slots 210 opposite to each other along the axial direction, and the two second slots 210 divide the conductive part 200 into semicircular arcs of the same shape. Exemplarily, the insulating sleeve 300 is sleeved on the side surface of the conductive part 200 away from the heating part 100. The insulating sleeve 300 is used to surround and cover the conductive part 200 while isolating the current conduction between the conductive part 200 and the power supply from the outside world. That is, the insulating sleeve 300 not only plays an insulating role, but also can surround and wrap the conductive part 200 when the conductive part 200 is conducting electricity and thermal expansion and contraction occur, so as to prevent the four-helix silicon carbon rod from being easily damaged.

[0045] In some embodiments, the first ends of the four first slots 110 are located on the same cross section of the heating portion 100; and / or, the tail ends of the four first slots 110 are located on the same cross section of the heating portion 100. With this arrangement, the stress-bearing areas at the first and tail ends of the heating portion 100 where the first slots 110 are provided are distributed more evenly, and stress concentration is less likely to occur, thereby preventing the heating portion 100 from being damaged during long-term use.

[0046] Exemplarily, the angle between the extension line formed by the first slot 110 on the side of the heating part 100 and the cross section of the heating part 100 is greater than or equal to 30°. After such a setting, since the four-helix silicon carbon rod is used in a vertical direction, the heating part 100 on the four-helix silicon carbon rod will be affected by gravity. At the same time, in an environment where the heating temperature is greater than 1000°C, the four-helix silicon carbon rod itself will be affected by thermal expansion and contraction and elongated. At this time, the solid part between the two adjacent first slots 110 has a relatively large inclination angle, and has good ductility during the process of elongation, so it is not easy to break or damage, which improves the damage resistance of the four-helix silicon carbon rod during the heating process.

[0047] In some other embodiments, the spiral pitch between two adjacent first slots 110 is at least 4 times the slot width of the first slot 110. For example, if the total length of the four-helix silicon carbon rod is designed to be 900mm, the inner diameter is 24mm, and the outer diameter is 40mm; wherein the total length of the corresponding heating portion 100 on the four-helix silicon carbon rod is designed to be 300mm, the total length of the conductive portion 200 is designed to be 600mm, and the slot width of the first slot 110 on the heating portion 100 is 5mm, then the spiral distance between the two adjacent first slots 110 is 20mm. After such a setting, since the spiral distance between the two adjacent first slots 110 is greater than the slot width of the first slot 110, the structural stability of the entity part between the two adjacent first slots 110 is better, and the four-helix silicon carbon rod is less likely to be damaged and broken during vertical use, further improving the damage resistance of the four-helix silicon carbon rod.

[0048] It is worth noting that the above length and width data are obtained after the total length of the four-helix silicon carbon rod is designed to be 900 mm. Of course, the example data is only applicable to the current four-helix silicon carbon rod. If the raw materials of the four-helix silicon carbon rod are replaced, the above data will be changed accordingly, and the number of spirals of the first slot 110 also needs to be adjusted according to the corresponding equipment.

[0049] In some embodiments, one end of the second slot 210 is connected to the end of one of the first slots 110. That is, among the four first slots 110, the ends of two first slots 110 are respectively connected to the end of one second slot 210. After such an arrangement, the resistance of the four-helix silicon carbon rod can be further reduced, thereby improving the heating efficiency of the four-helix silicon carbon rod during the heating process.

[0050] like Figure 4 , 5 As shown, the insulating sleeve 300 includes an insulating portion 310 and a wrapping portion 320; wherein, at least two insulating portions 310 are provided in an axially-fitted manner on the conductive portion 200; the wrapping portion 320 is sleeved on the periphery of a plurality of insulating portions 310, so that the plurality of insulating portions 310 are evenly distributed in the circumferential direction of the conductive portion 200, and the wrapping portion 320 itself can undergo elastic deformation. Exemplarily, the insulating portion 310 is configured as a ceramic insulating sheet, and the insulating portion 310 is preferably 4. Further, the wrapping portion 320 is configured as a stainless steel ferrule, which has a certain elastic deformation capacity, and can adaptively change the tension corresponding to the deformation of the conductive portion 200 during the heating process.

[0051] In the above technical solution, when the four-helix silicon carbon rod is in the heating working state, its own expansion coefficient will increase due to the influence of thermal expansion and contraction, so that the conductive part 200 itself will be deformed to a certain extent during the heating process, and the four ceramic insulating sheets can form a surrounding combination with a better arc matching in the circumferential direction of the conductive part 200, and the elastic deformation ability of the stainless steel ring makes the entire insulating sleeve 300 not easy to loosen and break. That is, the insulating sleeve 300 has higher flexibility and surrounding wrapping after being sleeved on the conductive part 200.

[0052] On this basis, the insulating sleeve 300 also has the function of effectively isolating the conductive part 200, and can prevent the conductive part of the conductive part 200 from contacting the external conductive part 200, thereby reducing the risk of current leakage and electrical short circuit. And because the insulating part 310 is configured as a ceramic insulating sheet, in a high-temperature working environment, the four ceramic insulating sheets can provide a certain degree of thermal isolation for the conductive part 200, reduce the ability of the four-helix silicon carbon rod to conduct heat to the surrounding environment, and reduce the possibility of thermal damage to personnel or other objects that touch the four-helix silicon carbon rod.

[0053] In some embodiments, gaps are formed between adjacent insulating portions 310 , wherein two radially opposite gaps are respectively opposite to the two second slots 210 . This arrangement ensures that the four insulating portions 310 will not block the second slots 210 on the conductive portion 200 after being sleeved on the conductive portion 200 .

[0054] Exemplary, combined Figure 5 , Figure 6 The insulating part 310 has an outer arc surface 311 and an inner arc surface 312; wherein the curvature of the inner arc surface 312 matches the curvature of the outer periphery of the conductive part 200, thereby improving the fit of the insulating part 310 after installation; the outer arc surface 311 is located on the insulating part 310 away from the inner arc surface 312, and protrusions 3110 are provided on both sides of the outer arc surface 311, and a locking groove 3120 for the wrapping part 320 to be placed is formed between the two protrusions 3110, and the wrapping part 320 is not easy to fall off after being sleeved on the four insulating parts 310, thereby improving the connection stability of the insulating sleeve 300 after installation. In some embodiments, a plurality of holes 321 are opened circumferentially on the wrapping part 320, thereby increasing the elastic deformation capacity of the wrapping part 320.

[0055] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention.

Claims

1. A quadruple helix silicon carbon rod, characterized in that: include: A heating portion (100), wherein the heating portion (100) is provided with a first slot (110) extending spirally along the axial direction, wherein four first slots (110) are provided, and each first slot (110) is evenly wound along the axial direction of the heating portion (100); The conductive part (200) is coaxially connected to the heating part (100), and the conductive part (200) is provided with two second slots (210) facing each other along the axial direction, and the two second slots (210) divide the conductive part (200) into semicircular arcs of the same shape; The insulating sleeve (300) is sleeved on the side of the conductive part (200) away from the heating part (100) and is used to surround and cover the conductive part (200) while isolating the current conduction between the conductive part (200) and the power source from the outside world.

2. The quadruple helix silicon carbon rod according to claim 1, characterized in that: The starting ends of the four first slots (110) are located on the same cross section of the heat-generating portion (100); and / or the ending ends of the four first slots (110) are located on the same cross section of the heat-generating portion (100).

3. The quadruple helix silicon carbon rod according to claim 2, characterized in that: The angle between an extension line of the first slot (110) formed on the side surface of the heat-generating portion (100) and a cross section of the heat-generating portion (100) is greater than or equal to 30°.

4. The quadruple helix silicon carbon rod according to claim 3, characterized in that: The spiral pitch between two adjacent first slots (110) is at least 4 times the slot width of the first slot (110).

5. The quadruple helix silicon carbon rod according to any one of claims 1 to 4, characterized in that: One end of the second slot (210) is connected to an end of one of the first slots (110).

6. The quadruple helix silicon carbon rod according to any one of claims 1 to 4, characterized in that: The insulating sleeve (300) comprises: At least two insulating parts (310) are provided in a circumferentially bonded manner to the conductive part (200); The wrapping portion (320) is sleeved on the periphery of the plurality of insulating portions (310) so that the plurality of insulating portions (310) are evenly distributed in the circumferential direction of the conductive portion (200), and the wrapping portion (320) itself can undergo elastic deformation.

7. The quadruple helix silicon carbon rod according to claim 6, characterized in that: The number of the insulating parts (310) is set to 4.

8. The quadruple helix silicon carbon rod according to claim 7, characterized in that: Gaps are formed between adjacent insulating portions (310), wherein two radially opposite gaps are opposite to two second slots (210) respectively.

9. The quadruple helix silicon carbon rod according to claim 6, characterized in that: The insulating portion (310) has an outer arc surface (311) and an inner arc surface (312); wherein the curvature of the inner arc surface (312) matches the curvature of the outer periphery of the conductive portion (200); The outer arc surface (311) is located on the insulating portion (310) at a position away from the inner arc surface (312), and protrusions (3110) are provided on both sides of the outer arc surface (311), and a locking groove (3120) for the wrapping portion (320) to be placed is formed between the two protrusions (3110).

10. The quadruple helix silicon carbon rod according to claim 9, characterized in that: The wrapping portion (320) is provided with a plurality of holes (321) in the circumferential direction.

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