All-metal screen high-temperature tank sinking furnace

Abstract

The utility model discloses an all-metal screen high-temperature tank sinking furnace which comprises a furnace body assembly, an upper screen assembly, a side screen assembly, a bottom screen assembly, a middle heating body, a supporting assembly and a bottom screen heating body. The furnace body assembly comprises an upper furnace cover, a middle furnace shell, a lower furnace shell and a water-cooled electrode; the upper screen assembly comprises an upper heat insulation screen, an upper protection plate, a division bar A and a connecting pull rod A; the side screen assembly comprises a side protection plate, a middle heat insulation screen, a division bar B and a connecting pull rod B; the middle heating body is located in the side screen assembly, and the bottom screen heating body and the supporting assembly are both arranged on the bottom screen assembly. The inner part of the device is of a metal structure, the overall strength is high, the production cycle of products is shortened, and the production efficiency of the products is improved; the thermal uniformity is good, and no graphite felt dust falls at high temperature; the cleanliness is better, and the product quality can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sinking trough furnaces, in particular to a full-metal screen high-temperature sinking trough furnace. Background Art

[0002] Quartz glass is prepared by melting billets in a high-temperature furnace and then cooling them to form high-purity quartz glass. However, traditional trough-sinking furnace equipment uses a combined insulation structure consisting of a metal screen and insulation wool. During the quartz glass preparation process, when vacuuming, the insulation wool will pulverize and fall at high temperatures, entering the furnace cavity through gaps and falling onto the surface of the quartz glass, forming tiny suspended matter and bubbles, resulting in a low production yield. In addition, this structure has a good insulation effect, but it also has high power loss, long cooling time, and low continuous production efficiency. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a full metal screen high-temperature trough sink furnace, thereby improving the cleanliness inside the furnace, reducing energy consumption and improving continuous production capacity.

[0004] The technical solution adopted in this utility model is:

[0005] A full metal screen high temperature tank sink furnace, comprising a furnace body assembly, an upper screen assembly, a side screen assembly, a bottom screen assembly, a middle heating element, a support assembly and a bottom screen heating element;

[0006] The furnace body assembly includes an upper furnace cover, an intermediate furnace shell, a lower furnace shell, and water-cooled electrodes; the upper furnace cover is a dome structure, and an inspection flange plate is provided in the center of the upper furnace cover; the intermediate furnace shell is open at both ends, and the upper furnace cover and the intermediate furnace shell are connected by bolts; the lower furnace shell is circular and is movably arranged at the bottom of the intermediate furnace shell; a plurality of water-cooled electrodes are evenly spaced and arranged on the upper furnace cover on the same circumference;

[0007] The upper screen assembly includes an upper heat insulation screen, an upper guard plate, spacers A, and connecting rods A; the upper heat insulation screen includes several layers of tungsten heat insulation screens, several layers of molybdenum-lanthanum alloy heat insulation screens, and several layers of 310S stainless steel heat insulation screens stacked in sequence from bottom to top; several spacers A are evenly arranged between the layers of the upper heat insulation screen in the radial direction; the upper guard plate is arranged on the upper heat insulation screen; and several connecting rods A are evenly distributed and penetrated on the upper heat insulation screen and the upper guard plate, corresponding to the positions of the spacers A.

[0008] The side screen assembly includes side guard plates, a middle heat insulation screen, spacers B and connecting rods B; the side guard plates and the middle heat insulation screen are both cylindrical, and a connecting seat is welded between the outer wall of the side guard plates and the inner wall of the intermediate furnace shell, and the upper end of the side guard plates and the upper guard plates are connected by bolts; the middle heat insulation screen is arranged in the side guard plates, and the middle heat insulation screen includes several layers of tungsten heat insulation screens, several layers of molybdenum-lanthanum alloy heat insulation screens and several layers of 310S stainless steel heat insulation screens arranged concentrically from the inside to the outside; several spacers B are evenly and vertically arranged on the outer walls of each layer of the middle heat insulation screen; several connecting rods B are evenly and horizontally distributed on the side guard plates and the middle heat insulation screen corresponding to the positions of each spacer;

[0009] The bottom screen assembly has the same structure as the upper screen assembly and is relatively arranged on the lower furnace shell. The bottom screen assembly, the upper screen assembly and the side screen assembly together form a cylindrical inner furnace body.

[0010] The intermediate heating element is located in the side screen assembly and includes a plurality of tungsten plates and tungsten heating rods. The ends of each two tungsten plates are connected to form a heating element. Two heating elements are connected in parallel as a group. The lower end of each heating rod is connected to the middle of the upper end of each group of heating elements. The upper end of the heating rod passes through the upper screen assembly and is connected to the electrode rod of the corresponding water-cooled electrode on the upper furnace cover. The lower end of each group of heating elements is connected in series through a tungsten plate ring.

[0011] The bottom screen heating element and support assembly are both on the bottom screen assembly. The support assembly includes support columns, fire baffles and support strips. The support columns are arranged in several rows on the bottom plate of the furnace shell. The upper ends of the support columns pass through the bottom screen assembly. Fire baffles are provided between the support columns and each heat insulation screen. Support strips are respectively provided on the upper ends of the support columns in each row.

[0012] The bottom screen heating element includes a ceramic insulating column, a support seat and a tungsten heating rod. The ceramic insulating column and the support column are arranged correspondingly. The ceramic insulating column also passes through the bottom screen assembly and is arranged on the bottom plate of the furnace body. The support seats are respectively arranged on the upper ends of the ceramic insulating columns. The tungsten heating rod is S-shaped and surrounds the support column and is arranged on the support seat. The two ends of the tungsten heating rod respectively pass through the bottom screen assembly and the bottom plate of the furnace shell and are connected to the external heating electrode.

[0013] Specifically, the upper furnace cover, the middle furnace shell and the lower furnace shell are all double-layer structures, and a circulating water inlet for cooling is also provided at the bottom of the lower furnace shell.

[0014] Specifically, the upper guard plate is concentrically arranged with several reinforcing rib rings from the center of the circle to the outside. The outermost reinforcing rib ring is arranged on the lower side of the circumference of the upper guard plate and wrapped around the circumference of the heat insulation screen of the upper screen assembly. Reinforcing ribs are evenly arranged between the reinforcing rib rings on the upper guard plate along the radial direction. The upper guard plate and the reinforcing rib rings are both made of stainless steel.

[0015] Specifically, the side guard plate includes a cylindrical guard plate, a circumferential reinforcing rib ring arranged along the circumference of the cylindrical guard plate, and vertical reinforcing ribs arranged between the circumferential reinforcing rib rings.

[0016] Specifically, the spacer bars A and B are both tungsten-molybdenum spacers with U-shaped cross-sections.

[0017] Specifically, spiral springs are provided along the circumference at the upper and lower ends between each layer of the central heat insulation screen.

[0018] Specifically, the side shields of the side screen assembly and the upper and lower ports of the middle heat shield are provided with circular edging rings composed of a number of U-shaped clips along the circumference, and the edging rings are connected to the side shields and the middle heat shield by screws.

[0019] Specifically, a thermocouple passing through the furnace shell and the bottom screen assembly is further provided at the bottom of the furnace body.

[0020] Due to the adoption of the above-mentioned technical solution, the utility model has the following advantages:

[0021] The interior of the utility model is entirely made of metal structure with high structural coordination. The heat insulation screens are compactly connected. U-shaped spacers made of tungsten-molybdenum materials are used between each layer for heat insulation treatment, which effectively prevents heat from overflowing and also prevents the tungsten-molybdenum materials from softening and collapsing at high temperatures, and has high overall strength. After the process is completed, the natural cooling time is short, and a water cooling cycle is set at the bottom, which further improves the cooling efficiency, shortens the product production cycle, and improves the product production efficiency. The full metal screen structure has a similar material expansion coefficient, so when the equipment is running at high temperature, the thermal uniformity is good and the expansion size is basically the same, which increases the service life of the equipment, and no graphite felt dust falls at high temperatures; the cleanliness is better, and the product quality can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial cross-sectional schematic diagram of the utility model as a whole.

[0023] Figure 2 It is a half-section schematic diagram of the interior of the utility model.

[0024] Figure 3 It is a schematic diagram of the side screen assembly of the present invention without the side guard plate.

[0025] Figure 4 It is a schematic diagram of the connection between the intermediate heating element and the water-cooled electrode of the utility model.

[0026] Figure 5 It is a schematic diagram of the edging ring of the present invention.

[0027] In the figure: 1-furnace body assembly, 11-upper furnace cover, 111-maintenance flange plate, 12-middle furnace shell, 13-lower furnace shell, 14-water-cooled electrode, 2-upper screen assembly, 21-upper heat insulation screen, 22-upper guard plate, 221-reinforcement rib ring, 23-spacer A, 24-connecting rod A, 3-side screen assembly, 31-side guard plate, 311-circumferential reinforcement rib ring, 312-connecting seat, 32-middle heat insulation screen, 321-spiral spacer spring, 33-spacer B, 34-connecting rod B, 35-edge ring, 4-bottom screen assembly, 5-middle heating element, 51-tungsten plate, 52-tungsten heating rod, 6-support assembly, 61-support column, 62-fire baffle, 63-support strip, 7-bottom screen heating element, 71-ceramic insulating column, 72-support seat, 73-tungsten heating rod. DETAILED DESCRIPTION

[0028] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0029] Combined with attachment Figure 1-5 The shown embodiment is a full metal screen high temperature trough sink furnace, comprising a furnace body assembly 1, an upper screen assembly 2, a side screen assembly 3, a bottom screen assembly 4, an intermediate heating element 5, a support assembly 6 and a bottom screen heating element 7.

[0030] The furnace body assembly 1 includes an upper furnace cover 11, an intermediate furnace shell 12, a lower furnace shell 13 and water-cooled electrodes 14; the upper furnace cover 11 is a dome structure, and an inspection flange plate 111 is provided in the center of the upper furnace cover 11; the intermediate furnace shell 12 is open at both ends, and the upper furnace cover 11 and the intermediate furnace shell 12 are connected by bolts; the lower furnace shell 13 is circular and is movably arranged at the bottom of the intermediate furnace shell 12; 9 water-cooled electrodes 14 are located on the same circumference and are evenly spaced on the upper furnace cover 11.

[0031] The upper screen assembly 2 includes an upper heat insulation screen 21, an upper guard plate 22, a spacer A23 and a connecting rod A24; the upper heat insulation screen 21 includes 4 layers of tungsten heat insulation screens, 8 layers of molybdenum-lanthanum alloy heat insulation screens and 3 layers of 310S stainless steel heat insulation screens stacked in sequence from bottom to top; the spacer A23 is a tungsten-molybdenum spacer with a U-shaped cross section, and a plurality of spacers A23 are evenly arranged between the layers of the upper heat insulation screen 21 in the radial direction; the upper guard plate 22 is arranged on the upper heat insulation screen 21, and the upper guard plate 22 is arranged from A number of reinforcing rib rings 221 are concentrically arranged outward from the center of the circle. The outermost reinforcing rib ring 221 is arranged on the lower side of the circumference of the upper guard plate 22 and wrapped around the circumference of the heat insulation screen of the upper screen assembly 2. Reinforcing ribs are evenly arranged between the reinforcing rib rings 221 on the upper guard plate 22 along the radial direction. The upper guard plate 22 and the reinforcing rib rings 221 are both made of stainless steel; a number of connecting rods A24 are evenly dispersed on the upper heat insulation screen 21 and the upper guard plate 22 corresponding to the positions of the partition bars A23.

[0032] The side screen assembly 3 includes a side guard plate 31, a middle heat insulation screen 32, a partition bar B33 and a connecting rod B34; the side guard plate 31 and the middle heat insulation screen 32 are both cylindrical, and a connecting seat 312 is welded between the outer wall of the side guard plate 31 and the inner wall of the intermediate furnace shell 12. The side guard plate 31 includes a cylindrical guard plate and a circumferential reinforcing rib ring 311 arranged along the circumference of the cylindrical guard plate and vertical reinforcing ribs arranged between the circumferential reinforcing rib ring 311. The circumferential reinforcing ribs at the upper end of the side guard plate 31 are connected to the reinforcing rib ring of the upper guard plate 22. 221 are fastened together by bolts; the central heat insulation screen 32 is arranged in the side guard plate 31, and the central heat insulation screen 32 includes 4 layers of tungsten heat insulation screens, 8 layers of molybdenum-lanthanum alloy heat insulation screens and 3 layers of 310S stainless steel heat insulation screens arranged concentrically from the inside to the outside; the partition bar B33 is a tungsten-molybdenum partition bar with a U-shaped cross-section, and several partition bars B33 are evenly and vertically arranged on the outer wall of each layer of the central heat insulation screen 32; several connecting rods B34 are evenly dispersed and horizontally passed through the side guard plate 31 and the central heat insulation screen 32 corresponding to the position of each partition bar.

[0033] The bottom screen assembly 4 has the same structure as the upper screen assembly 2 and is relatively arranged on the lower furnace shell 13. The bottom screen assembly 4, the upper screen assembly 2 and the side screen assembly 3 together form a cylindrical inner furnace body.

[0034] The intermediate heating element 5 is located in the side screen assembly 3. The intermediate heating element 5 includes 36 tungsten plates 51 and 9 tungsten heating rods 52. The ends of every two tungsten plates 51 are connected to form a heating element. The two heating elements are connected in parallel as a group. The lower end of each heating rod 52 is respectively connected to the middle of the upper end of each group of heating elements. The upper end of the heating rod 52 passes through the upper screen assembly 2 and is connected to the electrode rod of the corresponding water-cooled electrode 14 on the upper furnace cover 11; the lower end of each group of heating elements is connected in series through a tungsten plate ring.

[0035] The bottom screen heating element 7 and the support assembly 6 are both on the bottom screen assembly 4. The support assembly 6 includes support columns 61, fire baffles 62 and support strips 63. The support columns 61 are arranged in several rows on the bottom plate of the furnace shell. The upper ends of the support columns 61 are arranged through the bottom screen assembly 4. Fire baffles 62 are arranged between the support columns 61 and each insulation screen, and the support strips 63 are respectively arranged at the upper ends of the support columns 61 in each row.

[0036] The bottom screen heating element 7 includes a ceramic insulating column 71, a support seat 72 and a tungsten heating rod 73. The ceramic insulating column 71 is arranged corresponding to the support column 61. The ceramic insulating column 71 also passes through the bottom screen assembly 4 and is arranged on the bottom plate of the furnace body. The support seats 72 are respectively arranged on the upper ends of the ceramic insulating columns 71. The tungsten heating rod 73 is S-shaped and surrounds the support column 61 and is arranged on the support seat 72. The two ends of the tungsten heating rod 73 respectively pass through the bottom screen assembly 4 and the bottom plate of the furnace shell and are connected to the external heating electrode.

[0037] Preferably, the upper furnace cover 11, the middle furnace shell 12 and the lower furnace shell 13 are all double-layer structures, and a circulating water inlet for cooling is further provided at the bottom of the lower furnace shell 13.

[0038] Preferably, spiral spacer springs 321 are provided along the circumference at the upper and lower ends between each layer of the central heat insulation screen 32 .

[0039] Preferably, the side guard plate 31 of the side screen assembly 3 and the upper and lower ports of the middle heat insulation screen 32 are provided with a circular edging ring 35 composed of a number of U-shaped clips along the circumference, and the edging ring 35 is connected to the side guard plate 31 and the middle heat insulation screen 32 by screws.

[0040] Preferably, a thermocouple passing through the furnace shell and the bottom screen assembly 4 is also provided at the bottom of the furnace body.

[0041] During assembly, the heat insulation screens of the upper screen assembly 2, side screen assembly 3 and bottom screen assembly 4 of the utility model are all arranged from the inside to the outside in sequence as follows: the first layer is a 1mm tungsten screen, the second and third layers are 0.8mm tungsten screens, the fourth layer is a 0.5mm tungsten screen, the fifth layer is a 0.8mm molybdenum-lanthanum alloy screen, the sixth to twelfth layers are 0.5mm molybdenum-lanthanum alloy screens, the thirteenth to fifteenth layers are 1mm 310S stainless steel, the upper guard plate 22, the side guard plate 31 and the bottom guard plate of the bottom screen assembly 4 are all 1mm thick 316 stainless steel; the middle heating element 5 and the 9 water-cooled electrodes 14 are three-phase star-connected for heating to form the main heating zone in the furnace; the bottom screen heating element 7 is auxiliary heating; when in use, the crucible of the billet to be melted is placed on the support strip 63, the upper furnace cover 11 and the middle furnace shell 12 are aligned and merged with the lower furnace shell 13 by bolts, and the heating electrodes are turned on to heat the furnace.

[0042] The parts not described in detail in this utility model are prior art.

[0043] The embodiments selected herein for the purpose of disclosing the invention of the present utility model are currently considered appropriate. However, it should be understood that the present utility model is intended to include all changes and improvements of the embodiments that fall within the scope of the present concept and utility model.

Claims

1. A full metal screen high temperature tank sink furnace, characterized in that: It includes furnace body assembly, upper screen assembly, side screen assembly, bottom screen assembly, middle heating element, support assembly and bottom screen heating element; The furnace body assembly includes an upper furnace cover, an intermediate furnace shell, a lower furnace shell, and water-cooled electrodes; the upper furnace cover is a dome structure, and an inspection flange plate is provided in the center of the upper furnace cover; the intermediate furnace shell is open at both ends, and the upper furnace cover and the intermediate furnace shell are connected by bolts; the lower furnace shell is circular and is movably arranged at the bottom of the intermediate furnace shell; a plurality of water-cooled electrodes are evenly spaced and arranged on the upper furnace cover on the same circumference; The upper screen assembly includes an upper heat insulation screen, an upper guard plate, spacers A, and connecting rods A; the upper heat insulation screen includes several layers of tungsten heat insulation screens, several layers of molybdenum-lanthanum alloy heat insulation screens, and several layers of 310S stainless steel heat insulation screens stacked in sequence from bottom to top; several spacers A are evenly arranged between the layers of the upper heat insulation screen in the radial direction; the upper guard plate is arranged on the upper heat insulation screen; and several connecting rods A are evenly distributed and penetrated on the upper heat insulation screen and the upper guard plate, corresponding to the positions of the spacers A. The side screen assembly includes side guard plates, a middle heat insulation screen, spacers B and connecting rods B; the side guard plates and the middle heat insulation screen are both cylindrical, and a connecting seat is welded between the outer wall of the side guard plates and the inner wall of the intermediate furnace shell, and the upper end of the side guard plates and the upper guard plates are connected by bolts; the middle heat insulation screen is arranged in the side guard plates, and the middle heat insulation screen includes several layers of tungsten heat insulation screens, several layers of molybdenum-lanthanum alloy heat insulation screens and several layers of 310S stainless steel heat insulation screens arranged concentrically from the inside to the outside; several spacers B are evenly and vertically arranged on the outer walls of each layer of the middle heat insulation screen; several connecting rods B are evenly and horizontally distributed on the side guard plates and the middle heat insulation screen corresponding to the positions of each spacer; The bottom screen assembly has the same structure as the upper screen assembly and is relatively arranged on the lower furnace shell. The bottom screen assembly, the upper screen assembly and the side screen assembly together form a cylindrical inner furnace body. The intermediate heating element is located in the side screen assembly and includes a plurality of tungsten plates and tungsten heating rods. The ends of each two tungsten plates are connected to form a heating element. Two heating elements are connected in parallel as a group. The lower end of each heating rod is connected to the middle of the upper end of each group of heating elements. The upper end of the heating rod passes through the upper screen assembly and is connected to the electrode rod of the corresponding water-cooled electrode on the upper furnace cover. The lower end of each group of heating elements is connected in series through a tungsten plate ring. The support assembly and the bottom screen heating element are both on the bottom screen assembly. The support assembly includes support columns, fire baffles and support strips. The support columns are arranged in several rows on the bottom plate of the furnace shell. The upper ends of the support columns pass through the bottom screen assembly. Fire baffles are provided between the support columns and each insulation screen. Support strips are respectively provided on the upper ends of the support columns in each row. The bottom screen heating element includes a ceramic insulating column, a support seat and a tungsten heating rod. The ceramic insulating column and the support column are arranged correspondingly. The ceramic insulating column also passes through the bottom screen assembly and is arranged on the bottom plate of the furnace body. The support seats are respectively arranged on the upper ends of the ceramic insulating columns. The tungsten heating rod is S-shaped and surrounds the support column and is arranged on the support seat. The two ends of the tungsten heating rod respectively pass through the bottom screen assembly and the bottom plate of the furnace shell and are connected to the external heating electrode.

2. The all-metal screen high-temperature tank sink furnace according to claim 1, characterized in that: The upper furnace cover, the middle furnace shell and the lower furnace shell are all double-layer structures, and a circulating water inlet for cooling is also provided at the bottom of the lower furnace shell.

3. The all-metal screen high-temperature tank sinking furnace according to claim 1, characterized in that: The upper guard plate is concentrically provided with a number of reinforcing rib rings from the center of the circle outward. The outermost reinforcing rib ring is arranged on the lower side of the circumference of the upper guard plate and wrapped around the circumference of the heat insulation screen of the upper screen assembly. Reinforcing ribs are evenly arranged between the reinforcing rib rings on the upper guard plate in the radial direction. The upper guard plate and the reinforcing rib rings are both made of stainless steel.

4. The all-metal screen high-temperature tank sink furnace according to claim 1, characterized in that: The side guard plate comprises a cylindrical guard plate, a circumferential reinforcing rib ring arranged along the circumference of the cylindrical guard plate, and vertical reinforcing ribs arranged between the circumferential reinforcing rib rings.

5. The all-metal screen high-temperature tank sink furnace according to claim 1, characterized in that: The spacer bars A and B are both tungsten-molybdenum spacer bars with U-shaped cross-sections.

6. The all-metal screen high-temperature tank sink furnace according to claim 1, characterized in that: Spiral springs are arranged along the circumference at the upper and lower ends between the layers of the central heat insulation screen.

7. The all-metal screen high-temperature tank sinking furnace according to claim 1, characterized in that: The side shields of the side screen assembly and the upper and lower ports of the middle heat shield are provided with circular edging rings composed of several U-shaped clips along the circumference, and the edging rings are connected to the side shields and the middle heat shield by screws.

8. The all-metal screen high-temperature tank sinking furnace according to claim 1, characterized in that: The bottom of the furnace body is also provided with a thermocouple which passes through the furnace shell and the bottom screen assembly.

Images