Large electric heating radiant tube core and radiant tube

Abstract

The utility model provides a large-scale electric heating radiant tube core, the radiant tube core comprises a cover plate and a radiant tube core main body, the radiant tube core main body comprises a heat preservation part, a partition plate and a heating part, the heat preservation part is arranged between the cover plate and the partition plate, and the other side of the partition plate is provided with the heating part; the heating part comprises a center pull rod, a plurality of guide pull rods are uniformly arranged around the center pull rod in the circumferential direction at intervals, the center pull rod and the guide pull rods are sleeved with a plurality of limiting partition plates, the center pull rod penetrates through polygonal pull rod holes in the middles of the limiting partition plates, and the limiting partition plates divide the heating part into a plurality of heating sections; an electrode bar penetrates through the heat preservation part; a heating resistance wire is wound on the guide pull rod of each heating section, and the adjacent heating resistance wires on the same guide pull rod are connected through the end parts of the resistance wires; according to the utility model, the tube core is convenient to install, maintain and replace, the heating efficiency is high, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating radiant tubes for industrial furnaces, in particular to a large electric heating radiant tube core and a radiant tube with the radiant tube core. Background Art

[0002] Electric heating radiant tubes are widely used in industrial heating furnaces, such as heat treatment furnaces for steel and metal parts. They are the main heating elements of industrial heating furnaces. Radiant tubes are generally divided into two categories: gas radiant tubes and electric heating radiant tubes. Among them, electric heating radiant tubes are suitable for furnaces with protective atmosphere and corrosive atmosphere. For environmental protection, production cost, heating efficiency and other considerations, the heating method of industrial furnaces has changed from coal burning to gas, and then from gas to electric heating. At present, electric heating radiant tubes have become the main components for industrial furnace heating. Electric heating radiant tubes are generally composed of a radiant tube shell and a radiant tube core. The radiant tube core is a heating tube core installed inside the radiant tube. The radiant tube core usually includes an insulation part and a heating part.

[0003] For the metal processing industry, in addition to requiring electric heating radiant tubes to reach a higher heating temperature, it is necessary to control production costs to maintain continuous production, and the maintenance of various heating furnaces is also relatively troublesome. Therefore, electric heating radiant tubes are also required to have a relatively long service life in a high temperature environment, generally ensuring that they can be used continuously for more than 1 year, or even longer. The radiant tube core of the prior art is generally small in size, not long enough, and has low heating power, so the heating efficiency is low and the service life is short, which cannot meet the use requirements of large metal processing heating furnaces. Therefore, it is necessary to make technical improvements to the radiant tube core of the prior art to greatly improve the heating efficiency and extend the service life. Summary of the invention

[0004] The utility model aims to solve the shortcomings of the radiation tube core in the prior art, such as small volume, low heating efficiency and short service life, and proposes a large electric heating radiation tube core and an electric heating radiation tube having the radiation tube core.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A large electric heating radiation tube core, the radiation tube core comprises a cover plate and a radiation tube core body, the cover plate comprises a cover plate body, a through pull rod groove is provided in the middle of the cover plate, a pair of electrode mounting grooves are provided on the cover plate, and a through temperature sensing groove is also provided on the cover plate; the radiation tube core body comprises a heat preservation part, a partition and a heating part, the heat preservation part is arranged between the cover plate and the partition, and a heating part is arranged on the other side of the partition; the heating part comprises a central pull rod, and a plurality of guide rods are arranged circumferentially around the central pull rod and are evenly spaced. Pull rod, the center pull rod and the guide pull rod are sleeved with multiple limiting partitions, the center pull rod passes through the polygonal pull rod hole in the middle of the limiting partition, and the limiting partition divides the heating part into multiple heating sections; the electrode rod passes through the insulation part, one end of the electrode rod passes through the electrode mounting groove to form an electrode lead-out rod, and the other end passes through the partition to connect with the heating section, a heating resistance wire is wound on the guide pull rod of each heating section, and adjacent heating resistance wires on the same guide pull rod are connected by using the end of the resistance wire to pass through the wire groove of the limiting partition.

[0007] Preferably, the heat-insulating part is an asbestos block arranged between the cover plate and the partition plate, which can play a good heat-insulating role and also prevent the temperature of the heating part from leaking out.

[0008] Preferably, the limiting partition includes a partition body, and a pull rod hole is provided at the central axis of the partition body to facilitate the center pull rod to pass through the limiting partition. The pull rod hole is a square hole or a polygonal hole, which can prevent the ceramic limiting partition from rotating around the center pull rod. A plurality of wire grooves are evenly spaced around the pull rod hole on the partition body near the outer edge. A plurality of cylindrical pull rod limiting blocks are also evenly spaced around the pull rod hole on the partition body to facilitate the limiting of the porcelain tube II and the wire tube groove. A cylindrical hole is provided on the central axis of the pull rod limiting block to facilitate guiding the pull rod to pass through. A cylindrical temperature sensing hole is also provided on the partition body to facilitate the insertion of the temperature sensor.

[0009] Preferably, the first end of the center pull rod is fixed to the cover plate by a fixing bolt, and the second end of the center pull rod passes through the pull rod holes of the insulation part, the partition, the heating part and multiple limit partitions to extend to the bottom end of the heating part. The second end of the center pull rod is fixed to the limit plate I by welding, and the limit plate I abuts against one end of the short porcelain tube, and the other end of the short porcelain tube abuts against the partition body of the limit partition at the bottom end of the heating part. By setting the limit plate I, the installation, maintenance and replacement of the radiation tube core can be facilitated.

[0010] Preferably, the first end of the guide rod is connected to the cover plate, the second end of the guide rod passes through the heating part and the rod limit blocks of multiple limit partitions and extends to the bottom end of the heating part, the second end of the guide rod is fixed to the limit plate II by welding, and the limit plate II abuts against the rod limit block of the limit partition at the bottom end of the heating part. By setting the limit plate II, the installation, maintenance and replacement of the heating element can be facilitated.

[0011] Preferably, the outer periphery of the center pull rod is provided with a ceramic tube I, and the two ends of the ceramic tube I are respectively abutted against the partition bodies of the two limit partitions; the outer periphery of the guide pull rod is provided with a ceramic tube II, and the two ends of the ceramic tube II are respectively abutted against the pull rod limit blocks of the two limit partitions. By arranging ceramic tube I and ceramic tube II, an insulation effect can be achieved.

[0012] Preferably, the heating section also includes a wire tube groove, which is provided with a spiral groove. The heating resistance wire is wound and installed in the spiral groove of the wire tube groove, which can avoid short circuit caused by adjacent coils contacting each other after the heating resistance wire expands during the heating process. The wire tube groove is sleeved on the outer periphery of the ceramic tube II, and the ceramic tube II can support and fix the wire tube groove.

[0013] Preferably, the electrode lead-out rods include a positive electrode lead-out rod and a negative electrode lead-out rod, and the heating section can be electrically heated by connecting the positive electrode lead-out rod and the negative electrode lead-out rod to electricity.

[0014] Preferably, adjacent heating resistance wires on the same guide pull rod can be connected through the ends of the resistance wires, and the ends of the resistance wires cross the wire grooves of the limiting partitions, and the adjacent heating resistance wires are connected by means such as welding.

[0015] Preferably, the electric heating radiation tube core forms a large electric heating radiation tube after the sleeve is installed. The length of the radiation tube can reach 2 meters, the diameter can reach 40 centimeters, and the heating power is about 60KW, which meets the use requirements of large, high-temperature heat treatment furnaces.

[0016] The beneficial effects of the utility model are that the utility model has a large volume and a length of 2 meters, and can heat a large radiation tube with high heating efficiency and long service life; the wire tube groove of the heating part is provided with a spiral groove, which can avoid the expansion of the resistance wire during the heating process, thereby causing a short circuit caused by the contact between the resistance wires, and can greatly improve the service life of the radiation tube core; the adjacent heating resistance wires on the same guide pull rod can be connected through the ends of the resistance wires, which can greatly improve the structural strength of the radiation tube core on the one hand, facilitate assembly, and facilitate partial replacement once a certain section of the resistance wire has a problem and needs to be replaced; at the same time, the wire tube groove is sleeved on the outer periphery of the ceramic tube, and the ceramic tube can support and fix the wire tube groove and the resistance wire; the insulation part is provided with asbestos blocks of different thicknesses, which can play a good insulation role on the one hand, and can also avoid the temperature leakage of the heating part on the other hand; the central pull rod and the guide pull rod are provided to facilitate the installation, maintenance and replacement of the heating element and the heating part, and the porcelain tube is provided on the periphery of the central pull rod and the guide pull rod, which can play an insulating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of a large electric heating radiation tube core according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0019] Figure 3 A schematic diagram of the three-dimensional structure of a large-scale electric heat radiation tube core in one embodiment of the utility model from a viewing direction;

[0020] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of a large electric heating radiation tube core in another viewing direction of an embodiment of the utility model;

[0022] Figure 6 It is a structural schematic diagram of the cover plate of the large electric heating radiation tube core of the utility model;

[0023] Figure 7 It is a structural schematic diagram of the limiting partition of the large electric heating radiation tube core of the utility model;

[0024] Figure 8 It is a structural schematic diagram of the wire tube groove and heating resistance wire of the large electric heating radiation tube core of the utility model;

[0025] Fig. 9 This is a structural schematic diagram of a bottom limiting baffle of a large electric heating radiation tube core according to another embodiment of the utility model;

[0026] Figure numbers: 1-cover plate; 101-cover plate body; 102-pull rod slot; 103-electrode mounting slot; 104-temperature sensing slot; 2-insulation part; 3-heating section; 4-partition; 5-limiting partition; 501-partition body; 502-wire slot; 503-pull rod limiting block; 504-pull rod hole; 505-temperature sensing hole; 506-cylindrical hole; 507-short limiting porcelain tube; 6-center pull rod; 7-ceramic tube I; 8-fixing bolt; 9-short porcelain tube; 10-limiting piece I; 11-guide pull rod; 12-ceramic tube II; 13-wire tube slot; 14-heating resistance wire; 15-resistance wire end; 16-limiting piece II; 17-positive electrode lead rod; 18-negative electrode lead rod. DETAILED DESCRIPTION

[0027] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0028] like Figure 1-Figure 9 A large electric heating radiation tube core shown in the figure comprises a cover plate 1 and a radiation tube core body, the cover plate comprises a cover plate body 101, a through pull rod groove 102 is provided in the middle of the cover plate 1, a pair of electrode mounting grooves 102 are provided on the cover plate 1, a through temperature sensing groove 104 is provided on the side of the pull rod groove 102, the radiation tube core body comprises a heat preservation part 2, a partition 4 and a heating part, one end of the heat preservation part 2 is connected to the cover plate 1, and the other end of the heat preservation part is connected to one side of the partition 4, an electrode rod is provided in the heat preservation part, one end of the electrode rod passes through the electrode mounting groove 102 to form an electrode lead-out rod, and the other end of the electrode rod passes through the partition 4 and is connected to the heating section 3, the electrode The lead-out rods include a positive electrode lead-out rod 17 and a negative electrode lead-out rod 18, and the heating section 3 can be electrically heated by connecting the positive electrode lead-out rod 17 and the negative electrode lead-out rod 18; the other side of the partition 4 is connected to the heating part; the heating part includes a central pull rod 6, and a plurality of guide pull rods 11 are arranged circumferentially around the central pull rod 6 and are evenly spaced, and the central pull rod 6 and the guide pull rod 11 are respectively sleeved with a ceramic tube I7 and a ceramic tube II 12, and a plurality of limiting partitions 5 are sleeved on the central pull rod 6 and the guide pull rod 11 to divide the heating part into a plurality of heating sections 3; a heating resistance wire 14 is wound around the guide pull rod 11 of each heating section 3; Figure 4 and Figure 7 The limiting partition plate 5 is provided with a wire groove 502 for connecting the resistance wires 14 on adjacent heating sections on the same guide rod 11 in series. Figure 7As shown, the limiting partition 5 is provided with a rod hole 504 for the central rod 6 to pass through. In a preferred embodiment, the rod hole 504 is a square hole or a polygonal hole, which can prevent the limiting partition 5 from rotating around the central rod 6. On the one hand, it can facilitate the installation and positioning of multiple limiting partitions 5 and the central rod 6 and the assembly of the components of the entire radiation tube core. On the other hand, it can also prevent the limiting partition 5 from rotating around the central rod 6 and causing the ceramic tube Ⅰ7 and ceramic tube Ⅱ12 with a relatively brittle material inserted in the limiting partition 5 to break.

[0029] The large electric heating radiation tube core of the present application is provided with a plurality of guide pull rods 11 evenly spaced around the central pull rod 6, and a ceramic tube Ⅱ 12 is sleeved on the guide pull rod 11, on which a heating resistance wire 14 is wound. The size of the radiation tube core can be made relatively large, so that the outer diameter of the manufactured radiation tube can reach 30-40cm, the length can reach 2m, and the heating power can reach 60KW, which meets the use requirements of large-scale, high-temperature heat treatment furnaces.

[0030] In the large electric heating radiation tube core of the present application, a plurality of limiting partitions 5 are used to divide the radiation tube core into a plurality of heating sections 3, and each heating section 3 is separated by a plurality of limiting partitions 5. A ceramic tube Ⅱ 12 is provided on the guide pull rod 11 between adjacent limiting partitions 5, and a heating resistance wire 14 is wound on the ceramic tube Ⅱ 12. Adjacent heating resistance wires 14 on the same guide pull rod 11 can be connected by a wire groove 502 to connect the resistance wire ends 15. The resistance wire ends 15 cross the wire groove 52, and the adjacent heating resistance wires 14 are connected by welding. This structural form can greatly improve the structural strength of the radiation tube core on the one hand, and is convenient for assembly on the other hand. Third, once a certain section of the heating resistance wire 14 has a problem and needs to be replaced, only a partial replacement is required. If a heating resistor 14 is wound around a longer guide rod 11, firstly, when the heating resistor 14 is too long, it is easy to get loose and deform when used for a long time under high temperature, and contact will occur between adjacent coils or between the heating resistors 14 on adjacent guide rods 11, which will directly damage the radiation tube core. In addition, when maintaining the radiation tube core, if the heating resistor 14 needs to be replaced, it needs to be replaced as a whole, which has a higher maintenance cost.

[0031] In another preferred embodiment, Figure 8 The heating element on the guide pull rod 11 between the adjacent limiting partitions 5 also includes a wire tube groove 13, on which a spiral groove is provided, and a heating resistance wire 14 is wound and installed in the spiral groove of the wire tube groove 13, so as to avoid a short circuit caused by the contact between adjacent coils after the heating resistance wire 14 expands during the heating process. The wire tube groove 13 is sleeved on the outer periphery of the ceramic tube II 12, and the ceramic tube II 12 can support and fix the wire tube groove 13.

[0032] like Figure 7 As shown, the limiting partition 5 includes a partition body 501, and a pull rod hole 504 is provided at the center axis of the partition body 501 to facilitate the central pull rod 6 to pass through the limiting partition 5. A plurality of wire grooves 502 are evenly spaced around the pull rod hole near the outer edge of the partition body 501, and the resistance wire end 15 can pass through the wire groove 502 to connect the heating resistance wires 14 on two adjacent heating sections 3 through a process such as welding; a plurality of columnar pull rod limiting blocks 503 are evenly spaced around the pull rod hole 504 on the partition body 501 to facilitate the limiting of the porcelain tube II 12 and the wire tube groove 13, and a through hole is provided on the center axis of the pull rod limiting block 503. The cylindrical hole 506 is convenient for guiding the pull rod 11 to pass through; a cylindrical temperature-sensing hole 505 is also provided on the partition body 501 to facilitate the insertion of the temperature sensor; it should be understood that the temperature sensor does not need to pass through the entire radiation tube core, but only needs to be inserted into 2-3 limit partitions 5 that are closer to the partition 4, that is, the temperature-sensing groove 505 only needs to be set on the 2-3 limit partitions 5 that are closer to the partition 4, but in order to reduce costs, improve the standardization of components, facilitate the management of winding components, and simplify the assembly process, temperature-sensing grooves 505 can be set on all limit partitions 5, and there is no need to perform differentiated management of the limit partitions 5 during production.

[0033] like Figure 1 , Figure 5 As shown, the heat preservation part 2 is an asbestos block arranged between the cover plate 1 and the partition plate 4, which can play a good heat preservation role and also prevent the temperature of the heating part from leaking out.

[0034] like Figure 2 , Figure 3 As shown, the first end of the central tie rod 6 of the radiation tube core is fixed to the cover plate 1 by a fixing bolt 8, and the second end of the central tie rod 6 passes through the tie rod holes 504 of the heat preservation part 2, the partition 4, the heating part and a plurality of limit partitions 5 and extends to the bottom end of the heating part. The second end of the central tie rod 6 is fixed to the limit plate Ⅰ10 by welding, and the limit plate Ⅰ10 abuts against one end of the short porcelain tube 9, and the other end of the short porcelain tube 9 abuts against the partition body 501 of the limit partition 5 at the bottom end of the heating part. By setting the limit plate Ⅰ10, the installation, maintenance and replacement of the radiation tube core can be facilitated. Similarly, as Figure 1 , Figure 2 As shown, the first end of the guide rod 11 is connected to the partition 4, the second end of the guide rod 11 passes through the heating part and the rod limit block 503 of multiple limit partitions 5 and extends to the bottom end of the heating part, the second end of the guide rod 11 is fixed to the limit plate II 16 by welding, and the limit plate II abuts against the rod limit block 503 of the limit partition 5 at the bottom end of the heating part. By setting the limit plate II 16, the installation, maintenance and replacement of the heating element can be facilitated.

[0035] like Figure 7, Fig. 9 As shown, in another embodiment, the partition body 501 of the bottom limiting partition 5 is integrated with the short limiting porcelain tube 507 , and the other limiting partitions 5 are not provided with the short limiting porcelain tube 507 .

[0036] A ceramic tube Ⅰ7 is sleeved on the outer periphery of the center pull rod 6, and the two ends of the ceramic tube Ⅰ7 are respectively abutted against the partition body 501 of the two limit partitions 5; the ceramic tube Ⅱ12 is sleeved on the guide pull rod 11, and the two ends of the ceramic tube Ⅱ12 are respectively abutted against the pull rod limit blocks 503 of the two limit partitions 5. By arranging the ceramic tube Ⅰ7 and the ceramic tube Ⅱ12, an insulation effect can be achieved.

[0037] The large electric heating radiation tube core of the present application forms a large electric heating radiation tube after the sleeve is installed. The length of the radiation tube can reach 2 meters, the diameter can reach 40 centimeters, and the heating power is about 60KW; in addition, according to the actual use requirements of the industrial furnace, different numbers of heating sections 3 can be set to obtain electric heating radiation tubes of different specifications, which can meet the continuous and long-term use requirements of industrial heating furnaces with higher temperatures; and the tube core structure inside the radiation tube has high strength, high safety, and easy maintenance.

[0038] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A large electric heating radiation tube core, characterized in that: The radiation tube core includes a cover plate and a radiation tube core body, the cover plate includes a cover plate body, a through pull rod groove is provided in the middle of the cover plate, a pair of electrode mounting grooves are provided on the cover plate, and a through temperature sensing groove is also provided on the cover plate; the radiation tube core body includes a heat preservation part, a partition and a heating part, the heat preservation part is arranged between the cover plate and the partition, and the heating part is arranged on the other side of the partition; the heating part includes a central pull rod, and a plurality of guide pull rods are arranged circumferentially around the central pull rod and are evenly spaced, and a plurality of limiting partitions are sleeved on the central pull rod and the guide pull rod, the central pull rod passes through the polygonal pull rod hole in the middle of the limiting partition, and the limiting partition divides the heating part into a plurality of heating sections; the electrode rod passes through the heat preservation part, one end of the electrode rod passes through the electrode mounting groove to form an electrode lead-out rod, and the other end passes through the partition to be connected with the heating section, a heating resistance wire is wound on the guide pull rod of each heating section, and adjacent heating resistance wires on the same guide pull rod are connected by using the end of the resistance wire to pass through the wire groove of the limiting partition.

2. A large electric heating radiation tube core according to claim 1, characterized in that: The heat-insulating part is an asbestos block arranged between the cover plate and the partition plate.

3. A large electric heating radiation tube core according to claim 1, characterized in that: The limiting partition includes a partition body, a through pull rod hole is provided at the central axis of the partition body for the central pull rod to pass through, the pull rod hole is a square hole or a polygonal hole, a plurality of wire grooves are evenly spaced around the pull rod hole on the partition body near the outer edge, a plurality of cylindrical pull rod limiting blocks are also evenly spaced around the pull rod hole on the partition body, a through cylindrical hole is provided on the central axis of the pull rod limiting block, and a cylindrical temperature sensing hole is also provided on the partition body.

4. A large electric heating radiation tube core according to claim 1, characterized in that: The first end of the center pull rod is fixed to the cover plate by a fixing bolt, and the second end of the center pull rod passes through the pull rod holes of the insulation part, the partition, the heating part and multiple limit partitions and extends to the bottom end of the heating part. The second end of the center pull rod is fixed to the limit plate I by welding, and the limit plate I abuts against one end of the short porcelain tube, and the other end of the short porcelain tube abuts against the partition body of the limit partition at the bottom end of the heating part.

5. The large electric heating radiation tube core according to claim 1, characterized in that: The first end of the guide rod is connected to the cover plate, and the second end of the guide rod passes through the heating part and the rod limit blocks of multiple limit partitions and extends to the bottom end of the heating part. The second end of the guide rod is fixed to the limit plate II by welding, and the limit plate II abuts against the rod limit block of the limit partition at the bottom end of the heating part.

6. A large electric heating radiation tube core according to claim 1, characterized in that: The outer periphery of the central pull rod is provided with a ceramic tube I, and the two ends of the ceramic tube I respectively abut against the partition bodies of the two limit partitions; the outer periphery of the guide pull rod is provided with a ceramic tube II, and the two ends of the ceramic tube II respectively abut against the pull rod limit blocks of the two limit partitions.

7. The large electric heating radiation tube core according to claim 1, characterized in that: The heating section also includes a wire tube groove, on which a spiral groove is provided, and the heating resistance wire is wound and installed in the spiral groove of the wire tube groove, and the wire tube groove is sleeved on the outer circumference of the ceramic tube II.

8. The large electric heating radiation tube core according to claim 1, characterized in that: The electrode lead-out rods include a positive electrode lead-out rod and a negative electrode lead-out rod. The heating section is energized and heated by connecting the positive electrode lead-out rod and the negative electrode lead-out rod to electricity.

9. The large electric heating radiation tube core according to claim 1, characterized in that: Adjacent heating resistance wires on the same guide pull rod can be connected through the ends of the resistance wires. The ends of the resistance wires cross the wire grooves of the limiting partitions, and the adjacent heating resistance wires are connected by welding.

10. The large electric heating radiation tube core according to claim 1, characterized in that: The electric heating radiation tube core forms a large electric heating radiation tube after the sleeve is installed. The length of the radiation tube can reach 2 meters, the diameter can reach 40 centimeters, and the heating power is about 60KW.

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