Heater and annealing furnace adopting same

Abstract

The invention discloses a heater and an annealing furnace, the heater comprises: a housing having a heating cavity, a limiting seat arranged in the heating cavity, and a limiting groove formed in the limiting seat; the heating rod is fixed on the shell and extends into the heating cavity, a limiting rod is arranged on the part, located in the heating cavity, of the heating rod, the limiting rod extends into the limiting groove, gaps are formed between the limiting rod and the groove wall and the groove bottom face of the limiting groove, and the limiting groove is used for limiting large-amplitude shaking of the heating rod and is matched with the axial swelling amount of the heating rod after heating. According to the invention, the heating expansion amount of the heating rod can be adapted, large-amplitude shaking of the heating rod is limited, and the stability and the service life of the heater are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of heating equipment, and in particular to a heater and an annealing furnace. Background Art

[0002] In the industrial production process, annealing furnaces are widely used in the heating and heat treatment process of metal materials. Existing annealing furnaces generally include a furnace body and a heater. The product to be annealed is placed in the furnace body, and a heating rod is arranged in the heater. Then, a circulating airflow is formed between the furnace body and the heater through a fan, so that the heat of the heating rod is transferred to the product in the furnace body through the circulating airflow.

[0003] Since there is a circulating airflow flowing through the heater, and the circulating airflow needs to contact the heating rod for heat exchange, the heating rod is easily impacted by the circulating airflow and shakes, which easily leads to the instability of the heating rod. Therefore, some heaters currently directly fix the two ends of the heating rod to prevent the heater from shaking. However, according to the principle of thermal expansion and contraction, the heating rod will expand after heating, so that the heating rod will stretch to a certain extent, and the current heating rod fixing structure cannot adapt to the thermal expansion of the heating rod, which easily causes the heating rod to deform due to thermal expansion, affecting its service life. Therefore, there is an urgent need for a heater that can adapt to the thermal expansion of the heating rod and limit its shaking, so as to improve the reliability and service life of the equipment.

[0004] Application Contents

[0005] The present application provides a heater and an annealing furnace, which can adapt to the heat expansion of the heating rod while limiting the large-scale shaking of the heating rod, thereby ensuring the stability and service life of the heater.

[0006] The heater provided in this application comprises:

[0007] The shell has a heating chamber, a limiting seat is arranged in the heating chamber, and a limiting groove is arranged on the limiting seat;

[0008] The heating rod is fixed on the shell and extends into the heating chamber. The part of the heating rod located in the heating chamber is provided with a limit rod, which extends into the limit groove. There is a gap between the limit rod and the groove wall and groove bottom of the limit groove. The limit groove is used to limit the large shaking of the heating rod and adapt to the axial expansion of the heating rod after heating.

[0009] Preferably, the limiting rod is arranged on the end surface of the heating rod, and the limiting rod extends along the axial direction of the heating rod.

[0010] Preferably, the limiting groove is in a truncated cone shape, the limiting groove and the limiting rod are coaxially arranged, and the diameter of the limiting groove gradually decreases in the direction away from the heating rod.

[0011] Preferably, the shell includes an inner shell and an outer shell, the heating chamber is located in the inner shell, one end of the inner shell has a first end plate, one end of the outer shell has a second end plate, a connecting sleeve is connected between the first end plate and the second end plate to form a through channel between the first end plate and the second end plate, the heating rod is fixed to the second end plate, and the heating rod passes through the connecting sleeve and extends into the heating chamber in the inner shell.

[0012] Preferably, an annular protrusion is fixedly provided on the heating rod, the second end plate is located between the first end plate and the annular protrusion, and the second end plate is also provided with a pressing plate for pressing and fixing the annular protrusion on the end surface of the second end plate.

[0013] Preferably, a threaded column is provided on the end surface of the second end plate, the pressing plate is movably sleeved on the threaded column, and the nut is screwed on the threaded column to press and fix the pressing plate on the end surface of the heating rod.

[0014] Preferably, a first support rod is provided in the inner shell body, and the limit seat includes a tray and a limit block. The tray is fixed on the first support rod, and the limit block is detachably placed on the tray. In the direction perpendicular to the axis of the limit rod, the tray limits the limit block, and the limit groove passes through the limit block. The bottom surface of the limit groove is a part of the bottom surface of the tray.

[0015] The annealing furnace provided in the present application includes the heater described above.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0017] 1. By reserving a gap between the limit rod and the limit groove, the shaking of the heating rod can be effectively limited, and the problem of unstable fixation of the heating rod due to the impact of the circulating airflow can be prevented, thereby ensuring the stability of the heater. At the same time, it can provide appropriate activity space for the heating rod when the heating rod heats up and expands, avoiding deformation or damage of the heating rod due to expansion obstruction, thereby extending the service life of the heating rod.

[0018] 2. The limit groove is designed as an inverted truncated cone structure, which can better adapt to the thermal expansion of the heating rod. The more the heating rod expands and elongates, the closer the end of the heating rod is to the groove wall of the limit groove, so that the limit groove can better provide a stable limiting effect on the heating rod, further improving the reliability of the heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a heater in an embodiment;

[0020] Figure 2 is a top view of the heater of the embodiment;

[0021] Figure 3 for Figure 2AA section view in the figure;

[0022] Figure 4 for Figure 3 BB section view in the figure;

[0023] Figure 5 It is the combined view of the limit seat and the limit rod.

[0024] Description of reference numerals: 10, housing; 11, heating chamber; 111, limiting seat; 1111, tray; 1112, limiting block; 112, limiting groove; 1121, groove wall; 1122, groove bottom; 12, inner housing; 121, first end plate; 122, first support rod; 13, outer housing; 131, second end plate; 1311, pressing plate; 1312, threaded column; 132, second support rod; 14, connecting sleeve; 20, heating rod; 21, limiting rod; 22, annular protrusion; DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 to Figure 5 As shown, the heater of this embodiment includes a shell 10 and a heating rod 20.

[0027] The shell 10 includes an inner shell 12 and an outer shell 13, both of which are cylindrical structures and are coaxially arranged. There is a gap between the inner shell 12 and the outer shell 13, and the inner shell 12 and the outer shell 13 are connected by a plurality of second support rods 132. The inner shell 12 contains a heating chamber 11, and a tangential air inlet is arranged on the peripheral wall of the inner shell 12. The lower end of the inner shell 12 is an air outlet. The heating rod 20 is fixed on the shell 10 and extends into the heating chamber 11. In this way, the airflow enters the heating chamber 11 from the air inlet and then rotates and flows along the heating chamber 11. The heating rod 20 heats the airflow in the heating chamber 11, and the heated airflow is discharged from the air outlet.

[0028] A limiting seat 111 is arranged in the heating chamber 11, a limiting groove 112 is arranged on the limiting seat 111, a limiting rod 21 is arranged on the portion of the heating rod 20 located in the heating chamber 11, the limiting rod 21 extends into the limiting groove 112, and there is a gap between the limiting rod 21 and the groove wall 1121 and the groove bottom surface 1122 of the limiting groove 112. Through the cooperation of the limiting groove 112 and the limiting rod 21, the heating rod 20 can be prevented from shaking and the length change of the heating rod 20 generated during the thermal expansion process can be adapted, thereby avoiding the problem of the heating rod 20 being damaged due to expansion obstruction, thereby greatly improving the overall service life and operation reliability of the heater.

[0029] The limiting rod 21 is fixedly arranged on the end face of the heating rod 20, and the limiting rod 21 extends along the axial direction of the heating rod 20. The limiting rod 21 is coaxially arranged with the heating rod 20. The limiting groove 112 is in the shape of a truncated cone, and the limiting groove 112 is coaxially arranged with the limiting rod 21. The diameter of the limiting groove 112 gradually decreases in the direction away from the heating rod 20, that is, the limiting groove 112 is in the shape of an inverted truncated cone. As the heating rod 20 expands axially, the limiting rod 21 gradually moves in the limiting groove 112 in the direction away from the heating rod 20, further increasing the activity space, being able to better adapt to the expansion amount of the heating rod 20, and always maintaining a stable limiting effect during the expansion process.

[0030] The upper end of the inner shell 12 has a first end plate 121, and the upper end of the outer shell 13 has a second end plate 131. The first end plate 121 and the second end plate 131 are parallel to each other. A connecting sleeve 14 is connected between the first end plate 121 and the second end plate 131 to form a through channel between the first end plate 121 and the second end plate 131. The heating rod 20 is fixed to the second end plate 131, and the heating rod 20 passes through the connecting sleeve 14 and extends into the heating chamber 11 in the inner shell 12. In this way, a through channel is formed between the first end plate 121 and the second end plate 131 through the connecting sleeve 14, and the heating rod 20 is fixedly installed through the connecting sleeve 14, which not only ensures the stable installation of the heating rod 20, but also allows the heating rod 20 to freely extend during the thermal expansion process, further improving the stability and durability of the heating rod 20.

[0031] An annular protrusion 22 is fixedly provided on the upper end of the heating rod 20, and the second end plate 131 is located between the first end plate 121 and the annular protrusion 22, that is, the annular protrusion 22 is located above the second end plate 131, and the second end plate 131 is also provided with a pressing plate 1311 for pressing and fixing the annular protrusion 22 on the end surface of the second end plate 131, and a threaded column 1312 is provided on the end surface of the second end plate 131, and the pressing plate 1311 is movably sleeved on the threaded column 1312, and the nut is screwed on the threaded column 1312, so that the nut can move downward by rotating on the threaded column 1312, so that the nut can press and fix the pressing plate 1311 on the end surface of the heating rod 20. This structure not only ensures the stable installation of the heating rod 20, but also facilitates installation and disassembly, further improving the maintenance convenience and service life of the equipment.

[0032] A first support rod 122 is provided in the inner shell body 12, and the first support rod 122 is arranged in a direction perpendicular to the axis of the inner shell body 12. The limit seat 111 includes a tray 1111 and a limit block 1112. The tray 1111 is welded and fixed on the first support rod 122, and the limit block 1112 is detachably placed in the lower recess of the tray 1111, so that the tray 1111 forms a limit for the limit block 1112 in the direction perpendicular to the axis of the limit rod 21. The limit groove 112 passes through the limit block 1112, and the groove bottom surface 1122 of the limit groove 112 is a part of the bottom surface of the tray 1111. In this way, the limit block 1112 is placed in the lower recess of the tray 1111, and the limit block 1112 can be fixed firmly by the limit of the tray 1111, and it is convenient to install, disassemble and replace the limit block 1112.

[0033] In this embodiment, there are multiple heating rods 20, and correspondingly, there are also multiple connecting sleeves 14 and limit seats 111 matching the heating rods 20. They are in a one-to-one correspondence. By setting multiple heating rods 20, the heating efficiency of the airflow in the heating chamber 11 can be higher and the heating can be more uniform.

[0034] The annealing furnace of this embodiment includes a furnace body and the heater. Products to be annealed are placed in the furnace body, and then a circulating airflow is formed between the furnace body and the heating chamber 11 of the heater through a fan to transfer the heat of the heating rod 20 to the products in the furnace body through the circulating airflow.

[0035] This specification and drawings are merely exemplary illustrations of the present application and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, a person skilled in the art may make various modifications and variations to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalents, the present application intends to include these modifications and variations.

Claims

1. A heater, characterized in that: include: The housing (10) has a heating chamber (11), a limiting seat (111) is arranged in the heating chamber (11), and a limiting groove (112) is arranged on the limiting seat (111); The heating rod (20) is fixed on the shell (10) and extends into the heating chamber (11). The portion of the heating rod (20) located in the heating chamber (11) is provided with a limiting rod (21). The limiting rod (21) extends into the limiting groove (112). There is a gap between the limiting rod (21) and the groove wall (1121) and the groove bottom surface (1122) of the limiting groove (112). The limiting groove (112) is used to limit the large-scale shaking of the heating rod (20) and to adapt to the axial expansion of the heating rod (20) after heating.

2. The heater according to claim 1, characterized in that The limiting rod (21) is arranged on the end surface of the heating rod (20), and the limiting rod (21) extends along the axial direction of the heating rod (20).

3. The heater according to claim 1, characterized in that The limiting groove (112) is in the shape of a truncated cone. The limiting groove (112) and the limiting rod (21) are arranged coaxially. The diameter of the limiting groove (112) gradually decreases in a direction away from the heating rod (20).

4. The heater according to claim 1, characterized in that The shell (10) comprises an inner shell (12) and an outer shell (13); the heating chamber (11) is located in the inner shell (12); one end of the inner shell (12) has a first end plate (121); one end of the outer shell (13) has a second end plate (131); a connecting sleeve (14) is connected between the first end plate (121) and the second end plate (131) to form a through channel between the first end plate (121) and the second end plate (131); the heating rod (20) is fixed to the second end plate (131); the heating rod (20) passes through the connecting sleeve (14) and extends into the heating chamber (11) in the inner shell (12).

5. The heater according to claim 4, characterized in that The heating rod (20) is fixedly provided with an annular protrusion (22), the second end plate (131) is located between the first end plate (121) and the annular protrusion (22), and the second end plate (131) is also provided with a pressing plate (1311) for pressing and fixing the annular protrusion (22) on the end surface of the second end plate (131).

6. The heater according to claim 5, characterized in that A threaded column (1312) is provided on the end surface of the second end plate (131), the pressing plate (1311) is movably sleeved on the threaded column (1312), and the nut is screwed on the threaded column (1312) to press and fix the pressing plate (1311) on the end surface of the heating rod (20).

7. The heater according to claim 4, characterized in that A first support rod (122) is arranged in the inner shell body (12); the limiting seat (111) comprises a tray (1111) and a limiting block (1112); the tray (1111) is fixed on the first support rod (122); the limiting block (1112) is detachably placed on the tray (1111); in a direction perpendicular to the axis of the limiting rod (21), the tray (1111) limits the limiting block (1112); the limiting groove (112) passes through the limiting block (1112); and the groove bottom surface (1122) of the limiting groove (112) is a part of the bottom surface of the tray (1111).

8. An annealing furnace, characterized in that: A heater comprising the heater according to any one of claims 1 to 7.

Images