Molybdenum electrode cooling device of basalt fiber smelting furnace
By designing cooling components inside the cylinder and wrapping the molybdenum electrode with an inorganic thermally conductive powder layer, combined with inert gas protection, the problem of easy oxidation of the molybdenum electrode was solved, temperature control and depth adjustment were achieved, and the service life of the molybdenum electrode was extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JUSHI TECHNOLOGY (XINJIANG) CO LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-05-19
AI Technical Summary
In existing basalt fiber melting furnaces, the portion of the molybdenum electrode not covered by the melt is prone to oxidation, resulting in a shortened service life, and the depth of penetration into the melt cannot be adjusted.
A molybdenum electrode cooling device was designed, comprising a cylinder, a first cooling component, and a second cooling component. The molybdenum electrode is wrapped with a cooling water jacket, a spiral coil, and an inorganic thermally conductive powder layer, combined with inert gas protection, to achieve temperature control and axial movement of the molybdenum electrode.
It effectively reduces the temperature of the molybdenum electrode, delays oxidation, extends its service life, and allows for adjustment of the depth of the molybdenum electrode into the melt.
Smart Images
Figure CN224258493U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of basalt fiber processing equipment, and in particular to a molybdenum electrode cooling device for a basalt fiber furnace. Background Technology
[0002] Basalt fiber has attracted much attention due to its excellent properties such as high strength, high chemical stability, high thermal stability, and good electrical insulation, making it suitable for a wide range of applications in various industrial fields. Currently, basalt fiber is mostly prepared by melting basalt ore through electric heating with molybdenum electrodes to create continuous fibers.
[0003] In basalt furnaces, the portion of the molybdenum electrode not covered by the melt is extremely prone to oxidation at high temperatures (≥400℃), significantly shortening its lifespan. Therefore, during use, the portion of the molybdenum electrode not covered by the melt must be cooled to maintain a temperature below 400℃. For example, a Chinese utility model (title: "Cooling Device for Molybdenum Electrode," publication number: CN216863975U, authorization announcement date: 20220701) discloses a cooling device for a molybdenum electrode. The cooling device includes a housing, an inlet pipe, and an outlet pipe. The housing has a coolant reservoir. The inlet pipe and the outlet pipe are located within the housing (1) and both communicate with the coolant reservoir. The housing has a blind hole for inserting the end of the molybdenum electrode. This cooling device can quickly and effectively cool the molybdenum electrode, preventing oxidation.
[0004] Furthermore, the connection hole in the cooling device for the molybdenum electrode, which is only inserted into the end of the molybdenum electrode, can only protect the area near the end of the molybdenum electrode, and the depth of the molybdenum electrode into the melt cannot be adjusted. Utility Model Content
[0005] The present invention aims to provide a molybdenum electrode cooling device for a basalt fiber furnace, which can cool the corresponding part of the molybdenum electrode and the depth of the molybdenum electrode into the melt is adjustable.
[0006] The technical solution adopted in this utility model is:
[0007] A molybdenum electrode cooling device for a basalt fiber furnace includes:
[0008] A cylindrical body, wherein one end of the cylindrical body has an annular mounting cavity on its inner side;
[0009] A first cooling assembly is disposed within the annular mounting cavity;
[0010] A second cooling assembly is disposed inside the cylinder and located above the first cooling assembly;
[0011] The upper end of the molybdenum electrode is located inside the cylinder and is enclosed by the first cooling component and the second cooling component.
[0012] Furthermore, the cylindrical body includes:
[0013] The outer cylinder has an open end and a closed end; a through hole is provided in the middle of the closed end face of the outer cylinder.
[0014] The inner cylinder has two through-holes; the inner cylinder is located inside the outer cylinder, and the axial centers of the two coincide; the inner diameter of the inner cylinder and the inner diameter of the through hole are the same as the diameter of the cylindrical molybdenum electrode, and the edge of the through hole is connected at one end; the corresponding parts of the inner cylinder and the outer cylinder form the annular mounting cavity.
[0015] A cylindrical cover, one end of which is open and the other end is closed; the cylindrical cover is located at the open end of the outer cylinder; a threaded hole is formed in the middle of the closed end face of the cylindrical cover, and an adjusting screw that is movably connected to the top of the molybdenum electrode passes through the threaded hole.
[0016] Furthermore, the outer cylinder is connected to the cylinder cover flange.
[0017] Furthermore, the outer diameter of the open end portion of the cap is consistent with the inner diameter of the open end of the outer cylinder, and is inserted into the inner side of the open end of the outer cylinder.
[0018] Further, the first cooling component includes:
[0019] A cooling water jacket, wherein a spiral flow channel is formed inside the cooling water jacket along its axial length;
[0020] A water inlet pipe, one end of which is connected to the starting end of the spiral flow channel, and the other end of which extends outside the cylinder;
[0021] The water outlet pipe has one end connected to the end of the spiral flow channel and the other end extending outside the cylinder.
[0022] Furthermore, the cross-section of the spiral flow channel is rectangular.
[0023] Furthermore, the second cooling component includes:
[0024] A spring-shaped first spiral coil, one end of which extends outside the cylinder;
[0025] A spring-shaped second spiral coil is arranged concentrically with the first spiral coil and located inside the first spiral coil; the diameter of the second spiral coil is larger than the diameter of the columnar molybdenum electrode; one end of the second spiral coil extends outside the cylinder, and the other end is connected in series with the other end of the first spiral coil.
[0026] An inorganic thermally conductive powder layer fills the remaining area inside the cylinder excluding the space occupied by the first cooling component, the first spiral coil, the second spiral coil, the molybdenum electrode, and the adjusting screw.
[0027] Furthermore, the top of the cylinder is provided with a feeding hole and a plug that mates with the feeding hole.
[0028] Furthermore, an inert gas interface is provided on the side wall of the cylinder corresponding to the first cooling component; the inert gas interface is connected to an inert gas storage tank, and a gas flow valve and a check valve are provided on the connecting pipeline.
[0029] Furthermore, an annular air passage is formed on the side wall of the cylinder corresponding to the upper edge of the first cooling component, and the inert gas interface is connected to the annular air passage; a narrow slit with a width of 0.1~0.2mm is provided between the annular air passage and the inner side of the cylinder.
[0030] The beneficial effects of this utility model are:
[0031] This invention designs a molybdenum electrode cooling device for a basalt fiber furnace, comprising a cylindrical body, a first cooling assembly, and a second cooling assembly. The top of the molybdenum electrode is located inside the cylindrical body and is enclosed by the first and second cooling assemblies to reduce the temperature at the top of the molybdenum electrode, delay oxidation, and extend the service life of the molybdenum electrode. Simultaneously, the cylindrical body, the first cooling assembly, and the second cooling assembly have reserved space for axial movement of the molybdenum electrode, meeting the requirements for axial movement and allowing adjustment of the depth of the molybdenum electrode penetrating the melt. Attached Figure Description
[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a front view of the molybdenum electrode cooling device in the basalt fiber furnace in the example.
[0034] Figure 2 for Figure 1 Sectional view along the AA direction.
[0035] Figure 3 This is a schematic diagram of the assembly structure of the first cooling component, the second cooling component, and the molybdenum electrode.
[0036] Figure 4 for Figure 2 A magnified schematic diagram of the structure at point B in the middle.
[0037] The attached figures are labeled as follows:
[0038] 100. Cylinder body; 200. First cooling assembly; 300. Second cooling assembly; 400. Molybdenum electrode;
[0039] 110. Outer cylinder; 111. Inert gas inlet; 112. Annular gas passage; 113. Narrow slit; 120. Inner cylinder; 130. Cylinder cover; 131. Threaded hole; 132. Wire hole; 133. Material filling hole;
[0040] 210. Cold water jacket; 211. Spiral flow channel; 220. Inlet pipe; 230. Outlet pipe;
[0041] 310. First spiral coil; 320. Second spiral coil;
[0042] 410. Adjusting screw. Detailed Implementation
[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0044] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.
[0045] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.
[0046] Figure 1 This is a front view of the molybdenum electrode cooling device in the basalt fiber furnace in the example. Figure 2for Figure 1 Sectional view along line AA. (See attached image) Figure 1 and 2 As shown, the molybdenum electrode cooling device for the basalt fiber furnace includes a cylinder 100, a first cooling component 200, and a second cooling component 300. The first cooling component 200 and the second cooling component 300 are arranged within the cylinder 100 along its inner height, with the first cooling component 200 located below the second cooling component 300. The top end of the molybdenum electrode 400 is located within the cylinder 100 and is enclosed by the first cooling component 200 and the second cooling component 300 to reduce the temperature of the top end of the molybdenum electrode 400 (e.g., to 350°C), delaying oxidation and extending the service life of the molybdenum electrode 400. Simultaneously, space is reserved within the cylinder 100, the first cooling component 200, and the second cooling component 300 for axial movement of the molybdenum electrode 400, allowing for adjustment of the depth of the portion of the molybdenum electrode 400 that penetrates the melt (the portion of the molybdenum electrode 400 located outside the cylinder 100).
[0047] Specifically, such as Figure 2As shown, the cylinder 100 includes an outer cylinder 110, an inner cylinder 120, and a cylinder cover 130. The outer cylinder 110 is open at one end and closed at the other end; a through hole is provided in the middle of the closed end face of the outer cylinder 110, and a flange is formed on the outside of the open end of the outer cylinder 110. The inner cylinder 120 has two through-holes and is located inside the outer cylinder 110; the axial center of the inner cylinder 120 coincides with the axial center of the outer cylinder 110; the inner diameter of the inner cylinder 120 is the same as the diameter of the through hole on the closed end of the outer cylinder 110, and one end of the inner cylinder 120 is connected to the inner side of the closed end of the outer cylinder 110, thereby forming an annular mounting cavity between the corresponding parts of the inner cylinder 120 and the outer cylinder 110, and the first cooling assembly 200 is fitted and disposed in the annular mounting cavity; at the same time, the inner diameter of the inner cylinder 120 is also the same as the diameter of the columnar molybdenum electrode 400, and the molybdenum electrode 400 is slidably disposed inside the inner cylinder 120, and a part of the molybdenum electrode 400 is located outside the outer cylinder 110. One end of the cap 130 is open, and the other end is closed. The outer diameter of the open end of the cap 130 is the same as the inner diameter of the open end of the outer cylinder 110, so that the open end of the cap 130 can be inserted into the inside of the open end of the outer cylinder 110 to improve the sealing performance when the cap 130 and the outer cylinder 110 are combined. A flange is also formed on the outer wall of the cap 130, so that a flange connection can be achieved between the cap 130 and the outer cylinder 110. A threaded hole 131 is formed in the middle of the closed end face of the cap 130, which is movably connected to the top of the molybdenum electrode 400. The adjusting screw 410 is fitted into the threaded hole 131. Rotating the adjusting screw 410 allows the molybdenum electrode 400 to move axially along the inner cylinder 120. A wire hole 132 and a feed hole 133 are also provided on the closed end face of the cylinder cover 130 adjacent to the threaded hole 131. The wire connected to the molybdenum electrode 400 passes through the wire hole 132 and is properly sealed. The length of the wire must meet the requirements for axial movement of the molybdenum electrode 400. A matching plug (not shown in the figure) is provided at the feed hole 133. In this embodiment, there is a certain distance between the closed end face of the cylinder cover 130 and the top of the molybdenum electrode 400, thereby meeting the requirements for axial movement of the molybdenum electrode 400 within the cylinder 100.
[0048] Figure 3 This is a schematic diagram of the assembly structure of the first cooling component, the second cooling component, and the molybdenum electrode. Figure 2 and Figure 3As shown, the first cooling assembly 200 includes a water jacket 210, an inlet pipe 220, and an outlet pipe 230. The water jacket 210 is annular, and its inner and outer diameters are the same as the inner and outer diameters of the annular mounting cavity formed between the outer cylinder 110 and the inner cylinder 120, respectively. The axial length of the water jacket 210 is the same as the axial length of the annular mounting cavity formed between the outer cylinder 110 and the inner cylinder 120, thus allowing the water jacket 210 to be fitted into the annular mounting cavity formed between the outer cylinder 110 and the inner cylinder 120. A spiral flow channel 211 is formed along its axial length inside the water jacket 210, and the cross-section of the spiral flow channel 211 is rectangular. One end of the inlet pipe 220 and the outlet pipe 230 are connected to the vicinity of the starting end and the ending end of the spiral flow channel 211, respectively. The other end of the inlet pipe 220 and the outlet pipe 230 pass through the cylinder cover 130. Cooling water (temperature <50℃) is continuously introduced into the spiral flow channel 211 of the cold water jacket 210 through the inlet pipe 220. This can continuously remove part of the heat transferred from the molybdenum electrode 400 wrapped by the inner cylinder 120 to the cold water jacket 210, thereby reducing the temperature of the corresponding part of the molybdenum electrode 400 and delaying oxidation. The cooled water after heat exchange is discharged from the outlet pipe 230.
[0049] like Figure 2 and Figure 3As shown, the second cooling assembly 300 includes an inorganic thermally conductive powder layer, a spring-shaped first spiral coil 310, and a spring-shaped second spiral coil 320. The first spiral coil 310 and the second spiral coil 320 are arranged in a concentric circle, with the second spiral coil 320 located inside the first spiral coil 310. The inner diameter of the second spiral coil 320 is larger than the diameter of the molybdenum electrode 400. The lower adjacent ends of the first spiral coil 310 and the second spiral coil 320 are connected to achieve a series connection. The upper ends of the first spiral coil 310 and the second spiral coil 320 respectively protrude from the cylinder cover 130. The inorganic thermally conductive powder layer is laid in the remaining space inside the outer cylinder 110 and the cylinder cover 130, excluding the space occupied by the first cooling component 200, the molybdenum electrode 400, the adjusting screw 410, the first spiral coil 310, and the second spiral coil 320. It is directly filled with commercially available inorganic thermally conductive powders such as alumina, aluminum nitride, boron nitride, and magnesium oxide, without the need for separate modification of the inorganic thermally conductive powder. In this embodiment, the inorganic thermally conductive powder constituting the inorganic thermally conductive powder layer has a certain thermal conductivity. The cooling water (temperature <50℃) introduced through the first spiral coil 310 and the second spiral coil 320 can remove the heat transferred from the molybdenum electrode 400 to the inorganic thermally conductive powder. In conjunction with the first cooling component 200, it can ultimately achieve cooling of the corresponding part of the molybdenum electrode 400 located in the cylinder 100 (for example, reducing it to 350℃), delaying oxidation and extending the service life of the molybdenum electrode 400. On the other hand, the filling properties of the inorganic thermally conductive powder can squeeze out most of the air (especially oxygen) inside the cylinder 100, which is beneficial to delaying oxidation and will not affect the axial movement of the molybdenum electrode 400. Furthermore, the inorganic thermally conductive powder has a certain fluidity, which can maintain the covering of the molybdenum electrode 400 even when the top position of the molybdenum electrode 400 changes, which is equivalent to building an oxygen barrier layer. As the molybdenum electrode 400 gradually moves axially out of the cylinder 100, if the amount of inorganic thermally conductive powder is insufficient to fill the corresponding cavity, it can be appropriately supplemented through the feeding hole 133.
[0050] In this embodiment, to further alter the gas atmosphere within the cylinder 100, an inert gas interface 111 is provided on the side wall of the outer cylinder 110 above the first cooling assembly 200. The inert gas interface 111 is connected to an inert gas storage tank, and a gas flow valve and a check valve are provided on the connecting pipeline. Thus, inert gas (nitrogen, argon, etc.) can flow unidirectionally into the cylinder 100 according to a preset flow rate. It should be noted that those skilled in the art should recognize that before the initial addition of inorganic thermally conductive powder, gas can be purged first for replacement, and then the gas supply should be paused before adding powder. Similarly, when subsequently replenishing inorganic thermally conductive powder, the gas supply should also be paused first.
[0051] Figure 4 for Figure 2 A magnified structural diagram of section B in the middle. (See attached diagram) Figure 4As shown, in order to further improve the uniformity of inert gas release, an annular gas channel 112 is opened on the side wall of the outer cylinder 110 corresponding to the upper edge of the first cooling component 200, and the inert gas interface 111 is connected to the annular gas channel 112; a narrow slit 113 with a width of 0.1~0.2mm is provided between the annular gas channel 112 and the inner side of the outer cylinder 110, so that the inert gas can be uniformly released in the circumferential direction of the inner wall of the outer cylinder 110, and the narrow slit 113 has a small slit width, which can also reduce the amount of inorganic heat-conducting powder entering the annular gas channel 112.
Claims
1. A molybdenum electrode cooling device for a basalt fiber furnace, characterized in that, include: A cylindrical body, wherein one end of the cylindrical body has an annular mounting cavity on its inner side; A first cooling assembly is disposed within the annular mounting cavity; A second cooling assembly is disposed inside the cylinder and located above the first cooling assembly; The upper end of the molybdenum electrode is located inside the cylinder and is enclosed by the first cooling component and the second cooling component.
2. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 1, characterized in that, The cylindrical body includes: The outer cylinder has an open end and a closed end; a through hole is provided in the middle of the closed end face of the outer cylinder. The inner cylinder has two through-holes; the inner cylinder is located inside the outer cylinder, and the axial centers of the two coincide; the inner diameter of the inner cylinder and the inner diameter of the through hole are the same as the diameter of the cylindrical molybdenum electrode, and the edge of the through hole is connected at one end; the corresponding parts of the inner cylinder and the outer cylinder form the annular mounting cavity. A cylindrical cover, one end of which is open and the other end is closed; the cylindrical cover is located at the open end of the outer cylinder; a threaded hole is formed in the middle of the closed end face of the cylindrical cover, and an adjusting screw that is movably connected to the top of the molybdenum electrode passes through the threaded hole.
3. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 2, characterized in that, The outer cylinder is connected to the cylinder cover flange.
4. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 2 or 3, characterized in that, The outer diameter of the open end of the cap is the same as the inner diameter of the open end of the outer cylinder, and it is inserted into the inside of the open end of the outer cylinder.
5. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 1, characterized in that, The first cooling component includes: A cooling water jacket, wherein a spiral flow channel is formed inside the cooling water jacket along its axial length; A water inlet pipe, one end of which is connected to the starting end of the spiral flow channel, and the other end of which extends outside the cylinder; The water outlet pipe has one end connected to the end of the spiral flow channel and the other end extending outside the cylinder.
6. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 5, characterized in that, The cross-section of the spiral flow channel is rectangular.
7. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 1, characterized in that, The second cooling component includes: A spring-shaped first spiral coil, one end of which extends outside the cylinder; A spring-shaped second spiral coil is arranged concentrically with the first spiral coil and located inside the first spiral coil; the diameter of the second spiral coil is larger than the diameter of the columnar molybdenum electrode; one end of the second spiral coil extends outside the cylinder, and the other end is connected in series with the other end of the first spiral coil. An inorganic thermally conductive powder layer fills the remaining area inside the cylinder excluding the space occupied by the first cooling component, the first spiral coil, the second spiral coil, the molybdenum electrode, and the adjusting screw.
8. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 7, characterized in that, The top of the cylinder is provided with a feeding hole and a plug that mates with the feeding hole.
9. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 1, characterized in that, An inert gas interface is provided on the side wall of the cylinder above the first cooling component; the inert gas interface is connected to an inert gas storage tank, and a gas flow valve and a check valve are provided on the connecting pipeline.
10. The molybdenum electrode cooling device for a basalt fiber furnace according to claim 9, characterized in that, An annular air passage is formed on the side wall of the cylinder corresponding to the upper edge of the first cooling component, and the inert gas interface is connected to the annular air passage; a narrow slit with a width of 0.1~0.2mm is provided between the annular air passage and the inner side of the cylinder.