Heating system and annealing furnace adopting same

Abstract

The invention discloses a heating system and an annealing furnace. The heating system comprises a fan, an air inlet pipe and a heater. The air inlet direction of the fan is vertically upward, the air outlet direction of the fan is horizontal, the heater is provided with a tangential air inlet through the cylindrical inner shell, and airflow enters in the tangential direction, spirally flows along the inner wall and then is vertically discharged downwards. The air outlet of the fan is directly communicated with the air inlet of the heater, an elbow connecting pipe does not need to be arranged, the pipeline structure is simplified, and airflow pressure loss is reduced. The device structure is simplified, energy consumption is reduced, the airflow heat exchange effect is enhanced, and the device is suitable for heating devices such as an annealing furnace.

Description

Technical Field

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

[0002] In the heating system of the annealing furnace, it is usually necessary to use a fan to transport the airflow to the heater for heating, and then transport the heated airflow into the furnace body. In the prior art, an elbow connecting pipe is usually required between the fan and the heater to change the direction of the airflow, but this structure has problems such as large airflow pressure loss, complex structure and high installation cost. Therefore, how to provide a heating system with a simplified structure, low pressure loss and good heat exchange effect has become a technical problem that needs to be solved by those skilled in the art.

[0003] Application Contents

[0004] The present application provides a heating system and an annealing furnace, which can simplify the pipeline structure, reduce airflow pressure loss, and enhance the heat exchange effect of the heater.

[0005] The heating system provided in this application includes:

[0006] The fan comprises a casing having an air inlet and an air outlet, wherein the air inlet direction of the casing is perpendicular to the air outlet direction of the casing;

[0007] The air inlet pipe is connected to the air inlet of the casing, and the air inlet direction of the casing is consistent with the axial direction of the air inlet pipe;

[0008] The heater comprises a cylindrical inner shell, a heating component is arranged in the inner shell, an air inlet is arranged on the peripheral wall of the inner shell, the first end of the inner shell is closed, the second end of the inner shell is arranged with an air outlet, the air outlet of the casing is connected with the air inlet of the inner shell, the air flow output by the casing enters the inner shell in a tangential direction and flows in a spiral along the inner wall of the inner shell, and is discharged from the air outlet of the inner shell, the air inlet direction of the inner shell is perpendicular to the air outlet direction of the inner shell, and the air inlet direction of the casing is parallel to but opposite to the air outlet direction of the inner shell.

[0009] Preferably, the second end of the inner shell is connected to an air outlet shell, and the diameter of the air outlet shell gradually decreases from the air inlet end to the air outlet end.

[0010] Preferably, the heating assembly comprises a plurality of heating rods, the heating parts of the heating rods being located in the inner shell and extending along the axial direction of the inner shell, so that the airflow can always contact the heating rods when spirally flowing in the inner shell.

[0011] Preferably, the heater also includes an outer shell, an inner shell is arranged in the outer shell, the outer shell has a second end plate, the first end of the inner shell has a first end plate, a plurality of connecting sleeves are connected between the first end plate and the second end plate to form a plurality of through channels between the first end plate and the second end plate, the heating rods and the connecting sleeves are arranged one by one, each heating rod is fixed to the second end plate, and each heating rod passes through the corresponding connecting sleeve and extends into 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, the fan also includes a drive motor and a bracket, the bracket is arranged on the casing, the drive motor is arranged on the bracket, the extension direction of the drive motor output shaft is parallel to the air inlet direction of the casing, and the output shaft of the drive motor drives the wind wheel in the casing to rotate through a transmission mechanism.

[0015] The annealing furnace provided in the present application includes the heating system.

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

[0017] The air inlet direction of the fan is vertically upward, the air outlet direction is horizontal, and the air inlet direction of the heater is horizontally tangential. The airflow rotates in the inner shell and is discharged vertically downward into the furnace body. In this way, the heater plays a role in heat exchange and changes the direction of the airflow. There is no need to set an elbow connecting pipe between the air inlet end of the fan and the air outlet end of the heater to change the airflow direction, which simplifies the pipeline structure and reduces wind pressure loss. At the same time, the heat exchange effect between the airflow and the heater is enhanced through the swirl effect, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a heating system of an embodiment;

[0019] Figure 2 is a front view of a heating system according to an embodiment;

[0020] Figure 3 for Figure 2 AA section view in the figure;

[0021] Figure 4 is a cross-sectional view of the heater;

[0022] Figure 5 Cutaway view of the heater with all the heating rods removed.

[0023] Explanation of the reference numerals: 10. fan; 11. casing; 12. drive motor; 13. bracket; 20. air inlet duct; 30. heater; 31. inner casing; 311. first end plate; 32. outer casing; 321. second end plate; 322. pressure plate; 323. threaded column; 33. air outlet casing; 34. heating rod; 341. annular protrusion. DETAILED DESCRIPTION

[0024] 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.

[0025] like Figure 1 to Figure 5 As shown, the heating system of this embodiment includes a fan 10 , an air inlet pipe 20 and a heater 30 .

[0026] The fan 10 includes a casing 11, a driving motor 12 and a bracket 13. The bracket 13 is arranged on the casing 11, and the driving motor 12 is arranged on the bracket 13. The casing 11 has an air inlet and an air outlet. The casing 11 is in an involute shape. A wind wheel is arranged in the casing 11. The driving motor 12 drives the wind wheel in the casing 11 to rotate through a transmission mechanism to generate airflow in the casing 11. The air inlet direction of the casing 11 is vertically upward, and the air outlet direction of the casing 11 is horizontal.

[0027] The air inlet pipe 20 is vertically arranged, and the upper end of the air inlet pipe 20 is connected to the air inlet of the casing 11 . The air inlet direction of the casing 11 is consistent with the axial direction of the air inlet pipe 20 .

[0028] The heater 30 includes a cylindrical inner shell 31, an outer shell 32, a heating rod 34 and a connecting sleeve 35. A heating component is arranged in the inner shell 31. A tangential air inlet is arranged on the peripheral wall of the inner shell 31. The upper end of the inner shell 31 is closed. An air outlet is arranged at the lower end of the inner shell 32. The lower end of the inner shell 31 is connected to an air outlet shell 33. The air inlet end of the air outlet shell 33 is connected to the lower end of the inner shell 31. The air outlet shell 33 discharges air vertically downward. The diameter of the air outlet shell 33 gradually decreases from top to bottom, thereby increasing the exhaust flow rate of the heater 30.

[0029] The air outlet of the casing 11 is connected with the air inlet of the inner casing 31. The airflow output by the casing 11 enters the inner casing 31 in a tangential direction and spirally flows along the inner wall of the inner casing 31, and is then discharged vertically downward from the air outlet of the inner casing 31. The air inlet direction of the inner casing 31 is perpendicular to the air outlet direction of the inner casing 31. The air inlet direction of the casing 11 is parallel to but opposite to the air outlet direction of the inner casing 31. That is to say, the casing 11 takes in air vertically upward, and the inner casing 31 discharges air vertically downward.

[0030] There are multiple heating rods 34, and the heating parts of the heating rods 34 are all located in the inner shell 31 and extend along the axial direction of the inner shell 31, so that the airflow can always contact the heating rods 34 when spirally flowing in the inner shell 31, thereby improving the heating efficiency of the airflow in the inner shell 31.

[0031] There are multiple connecting sleeves 35, the inner shell 31 is arranged in the outer shell 32, the outer shell 32 is also cylindrical, the upper end of the outer shell 32 is closed and the lower end is open, the upper end of the outer shell 32 has a second end plate 321, the upper end of the inner shell 31 has a first end plate 311, the first end plate 311 and the second end plate 321 are parallel, and multiple connecting sleeves 35 are connected between the first end plate 311 and the second end plate 321 to form a plurality of through channels between the first end plate 311 and the second end plate 322, the heating rods 34 and the connecting sleeves 35 are arranged one by one, and the upper end of each heating rod 34 is connected to the second end plate 3 21 are fixed, and each heating rod 34 passes through the corresponding connecting sleeve 35 and extends into the inner shell body 31. This structure can increase the total number of heating elements and expand the contact area between the airflow and the heating elements through the arrangement of multiple heating rods 34, thereby significantly improving the heat exchange efficiency; at the same time, a through channel is formed between the first end plate 311 and the second end plate 321 through the connecting sleeve 35, and the heating rod 34 is fixedly installed through the connecting sleeve 35, which not only ensures the stable installation of the heating rod 34, but also allows the heating rod 34 to stretch freely during the thermal expansion process, further improving the stability and durability of the heating rod 34.

[0032] The heating rod 34 is fixedly provided with an annular protrusion 341, the second end plate 321 is located between the first end plate 311 and the annular protrusion 341, the annular protrusion 341 is located above the second end plate 321, and the second end plate 321 is also provided with a pressing plate 322 for pressing and fixing the annular protrusion 341 on the end surface of the second end plate 321.

[0033] Specifically, a threaded column 323 is provided on the end face of the second end plate 321, and the pressure plate 322 is movably sleeved on the threaded column 323. The nut is screwed on the threaded column 323, so that the nut can move downward by rotating on the threaded column 323, so that the nut can press and fix the pressure plate 322 on the end face of the heating rod 34. This structure can ensure the reliability of fixing the heating rod 34 through the cooperation of the annular protrusion 341 and the pressure plate 322, and facilitate the disassembly, assembly and replacement of the heating rod 34, which is beneficial to the maintenance and overhaul of the equipment.

[0034] The casing 11 is horizontally arranged, the bracket 13 is installed on the upper surface of the casing 11, the drive motor 12 is installed on the bracket 11, the drive motor 12 is located above the casing 11, and the extension direction of the output shaft of the drive motor 12 is parallel to the air inlet direction of the casing 11, that is, the output shaft of the drive motor 12 is arranged vertically upward, and the output shaft of the drive motor 12 drives the wind wheel in the casing 11 to rotate through the transmission mechanism, that is, the output shaft of the drive motor 12 drives the drive shaft to rotate through the pulley transmission structure, the drive shaft is parallel to the output shaft of the drive motor 12, and the drive shaft is connected to the wind wheel in the casing 11. In this way, the installation method and installation direction of the drive motor 12 reduce the overall volume of the fan 10 to reduce the space occupied by the fan 10.

[0035] The annealing furnace of this embodiment includes a heating chamber and the heating system. The product to be annealed is placed in the heating chamber. The lower end of the air inlet pipe 20 is connected to the air outlet of the heating chamber. The lower end of the air outlet shell 33 is connected to the air inlet of the heating chamber. The airflow flows from the heating chamber into the inner shell 31 through the fan 10. The heating rod 34 is powered on to generate heat to heat the airflow in the inner shell 31. The heated airflow returns to the heating chamber through the air outlet shell 33, thereby forming a circulating airflow. The circulating airflow continuously transfers the heat of the heating rod 34 to the product in the heating chamber.

[0036] The heating system of this embodiment eliminates the elbow connecting pipe, making the airflow path shorter during the transportation process, reducing the pressure loss of the airflow at the elbow, thereby reducing the energy consumption of the system. In traditional heating systems, the existence of elbow connecting pipes easily causes turbulence of the airflow, increases the pressure loss of the airflow, and interferes with the flow rate and flow direction of the airflow. The present invention reasonably designs the connection method between the fan 10 and the heater 30, so that the airflow can complete the direction change while maintaining a stable flow, thereby effectively reducing the pressure loss of the airflow.

[0037] In addition, the air inlet end of the fan 10 also directly takes in air through the air inlet pipe 20, and there is no need to set up an elbow connecting pipe, which further simplifies the structure and reduces the airflow pressure loss. The heater 30 adopts a cylindrical inner shell 31 structure, and the airflow enters the inner wall of the inner shell 31 along the tangential direction through the tangential air inlet to form a rotating airflow. The rotating airflow can extend the residence time of the airflow in the heater 30 and increase the contact area between the airflow and the heating rod 34, thereby further improving the heat exchange efficiency. At the same time, the swirl airflow can also suppress the laminar flow phenomenon of hot air to a certain extent, promote the hot air to be evenly distributed in the heater 30, and further enhance the heat exchange effect.

[0038] 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 heating system, characterized in that: include: A fan (10) comprises a casing (11) having an air inlet and an air outlet, wherein the air inlet direction of the casing (11) is perpendicular to the air outlet direction of the casing (11); An air inlet pipe (20) is connected to the air inlet of the casing (11), and the air inlet direction of the casing (11) is consistent with the axial direction of the air inlet pipe (20); The heater (30) comprises a cylindrical inner shell (31), a heating component is arranged in the inner shell (31), an air inlet is arranged on the peripheral wall of the inner shell (31), the first end of the inner shell (31) is closed, the second end of the inner shell (32) is arranged with an air outlet, the air outlet of the casing (11) is connected with the air inlet of the inner shell (31), the air flow output by the casing (11) enters the inner shell (31) in a tangential direction and flows in a spiral along the inner wall of the inner shell (31), and is discharged from the air outlet of the inner shell (31), the air inlet direction of the inner shell (31) is perpendicular to the air outlet direction of the inner shell (31), and the air inlet direction of the casing (11) is parallel to but opposite to the air outlet direction of the inner shell (31).

2. The heating system according to claim 1, characterized in that: The second end of the inner shell (31) is connected to an air outlet shell (33), and the diameter of the air outlet shell (33) gradually decreases from the air inlet end to the air outlet end.

3. The heating system according to claim 1, characterized in that: The heating assembly comprises a plurality of heating rods (34), the heating parts of the heating rods (34) being located inside the inner shell (31) and extending along the axial direction of the inner shell (31), so that the airflow can always contact the heating rods (34) when spirally flowing inside the inner shell (31).

4. The heating system according to claim 3, characterized in that: The heater further comprises an outer shell (32), an inner shell (31) being arranged inside the outer shell (32), the outer shell (32) having a second end plate (321), a first end of the inner shell (31) having a first end plate (311), a plurality of connecting sleeves (35) being connected between the first end plate (311) and the second end plate (321) so as to form a plurality of through-channels between the first end plate (311) and the second end plate (322), the heating rods (34) and the connecting sleeves (35) being arranged in one-to-one correspondence, each heating rod (34) being fixed to the second end plate (321), and each heating rod (34) passing through a corresponding connecting sleeve (35) and extending into the inner shell (31).

5. The heating system according to claim 4, characterized in that An annular protrusion (341) is fixedly provided on the heating rod (34), the second end plate (321) is located between the first end plate (311) and the annular protrusion (341), and the second end plate (321) is also provided with a pressing plate (322) for pressing and fixing the annular protrusion (341) on the end surface of the second end plate (321).

6. The heating system according to claim 5, characterized in that: A threaded column (323) is provided on the end surface of the second end plate (321), the pressing plate (322) is movably sleeved on the threaded column (323), and the nut is screwed on the threaded column (323) to press and fix the pressing plate (322) on the end surface of the heating rod (34).

7. The heating system according to claim 1, characterized in that: The fan (10) further comprises a drive motor (12) and a bracket (13); the bracket (13) is arranged on the casing (11); the drive motor (12) is arranged on the bracket (13); the extension direction of the output shaft of the drive motor (12) is parallel to the air inlet direction of the casing (11); the output shaft of the drive motor (12) drives the wind wheel in the casing (11) to rotate through a transmission mechanism.

8. An annealing furnace, characterized in that: The invention comprises a heating system as claimed in any one of claims 1 to 7.

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