A type of smoke exhaust rack for a roasting furnace

Abstract

This utility model discloses a smoke exhaust rack for a roasting furnace, comprising: a smoke exhaust unit, which includes a main smoke exhaust pipe and branch smoke exhaust pipes, with one end of a plurality of branch smoke exhaust pipes spaced apart on the main smoke exhaust pipe, and the other end of the branch smoke exhaust pipes being connected to the roasting furnace; and a leakage prevention unit, comprising a pipe joint, a positioning head, a limiting ring, and a positioning pipe, wherein the pipe joint is installed at a predetermined inclined angle at the bottom of the main smoke exhaust pipe, one end of the positioning head is inserted into the interior of the pipe joint, the limiting ring is fixed to that end of the positioning head and fits against the inner wall of the pipe joint, and the other end of the positioning head is connected to the branch smoke exhaust pipes through the positioning pipe, and the outer surface of the positioning head is sequentially wrapped with a thermal expansion layer and a sealing rubber layer from the inside to the outside; this utility model can solve the problem in the prior art that, under the high-temperature operating conditions of the roasting furnace, the sealing material is prone to aging and deformation, and is prone to loosening under thermal stress, further aggravating the risk of leakage.

Description

Technical Field

[0001] This utility model relates to a smoke exhaust rack for a roasting furnace, belonging to the field of smoke exhaust technology for roasting furnaces. Background Technology

[0002] The flue gas rack is one of the key pieces of equipment in the roasting combustion system of the roasting furnace. Its function is to collect the flue gas in the roasting furnace fire channel and discharge it into the flue gas rack pipe before it enters the annular flue. Traditional pipe connection structures mostly use a single sealing method (such as rubber gasket seal). Under the high temperature (180-600℃) conditions of the roasting furnace, the sealing material is prone to aging and deformation, and is prone to loosening under thermal stress, further increasing the risk of leakage. Utility Model Content

[0003] Based on the above, this utility model provides a smoke exhaust rack for a roasting furnace to solve the problem in the prior art that the sealing material is prone to aging and deformation under high temperature (180-600℃) conditions in the roasting furnace, and is prone to loosening under thermal stress, which further aggravates the risk of leakage.

[0004] The technical solution of this utility model is: a smoke exhaust rack for a roasting furnace, comprising:

[0005] The smoke exhaust unit includes a main smoke exhaust pipe and branch smoke exhaust pipes. One end of a plurality of branch smoke exhaust pipes is spaced apart on the main smoke exhaust pipe, and the other end of the branch smoke exhaust pipes is used to connect to the roasting furnace.

[0006] The anti-leakage unit includes a pipe joint, a positioning head, a limiting ring, and a positioning pipe. The pipe joint is installed at the bottom of the main exhaust pipe at a predetermined inclined angle. One end of the positioning head is inserted into the interior of the pipe joint. The limiting ring is fixed to the same end of the positioning head and fits against the inner wall of the pipe joint. The other end of the positioning head is connected to the branch exhaust pipe through the positioning pipe. The outer surface of the positioning head is wrapped with a thermal expansion layer and a sealing rubber layer from the inside to the outside.

[0007] In one example, it also includes:

[0008] The fastening unit includes a positioning plate, a threaded rod, and a nut. There are two positioning plates, which are detachably and fixedly installed on the outside of the pipe joint and the positioning head, respectively. One end of the multiple threaded rods is fixed on one of the positioning plates, and the other end of the threaded rod passes through the other positioning plate. The nuts are sleeved on both sides of the positioning plate corresponding to the threaded rods.

[0009] In one example, the pipe joint and the positioning head have an externally expanding interface structure and are installed opposite each other, and their internal channels are frustum-shaped. The positioning plate is located in the middle of the externally expanding part of the pipe joint and the positioning head.

[0010] In one example, the thermal expansion layer is made of nickel-titanium alloy, polypropylene, brass Invar alloy, or thermal expansion ceramic.

[0011] In one example, the end of the main exhaust duct is connected to the exhaust system via an arc-shaped pipe.

[0012] In one example, the bend angle of the arc-shaped pipe is set to 60° to 20° and its channel diameter is larger than that of the main exhaust pipe. The bend angle of the upper part of the exhaust branch pipe is set to 30° to 60°.

[0013] In one example, the axis of the pipe joint is inclined at an angle of 15° to 30° to the horizontal plane.

[0014] In one example, the main exhaust duct is mounted on a support frame, which includes a positioning sleeve and a positioning plate. The positioning sleeve is fixedly mounted on the outside of the main exhaust duct, and the positioning plate is fixedly mounted on the bottom of the positioning sleeve.

[0015] The beneficial effects of this invention are as follows: During the smoke extraction process, due to the inclined design of the pipe joint, the flue gas can smoothly flow from the branch pipe into the main pipe. Simultaneously, the thermal expansion material layer on the outer surface of the positioning head expands under the action of the high-temperature flue gas, compressing the sealing rubber layer and ensuring a tight fit with the pipe joint, effectively preventing high-temperature flue gas leakage. Furthermore, the fastening unit reinforces the assembly strength of the anti-leakage unit, ensuring the sealing and stability of the connection, further preventing air leakage during smoke extraction, reducing energy waste and environmental pollution, and protecting the health and safety of operators. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the flue gas rack for the roasting furnace;

[0017] Figure 2 This is a structural schematic diagram of the support frame;

[0018] Figure 3 This is a schematic diagram of the fastening unit.

[0019] Figure 4 This is a schematic diagram of the leak-proof unit.

[0020] Figure 5 This is a schematic diagram of a pipe joint.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10 Smoke Exhaust Unit: 11 Main Smoke Exhaust Pipe, 12 Branch Smoke Exhaust Pipe, 13 Support Frame, 131 Positioning Sleeve, 132 Positioning Plate, 14 Curved Pipe;

[0023] 20 Leakage prevention unit: 21 Pipe joint, 22 Positioning head, 23 Limiting ring, 24 Positioning pipe, 25 Thermal expansion layer, 26 Sealing rubber layer;

[0024] 30 Fastening unit: 31 Positioning plate, 32 Threaded rod, 33 Nut. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] Please see Figures 1 to 5 This embodiment provides a smoke exhaust rack for a roasting furnace, including a smoke exhaust unit 10 and a leak prevention unit 20.

[0027] The exhaust unit 10 includes a main exhaust duct 11 and branch exhaust ducts 12. One end of each branch exhaust duct 12 is spaced apart and installed on the main exhaust duct 11, while the other end connects to the roasting furnace. The branch exhaust ducts 12 introduce the flue gas generated by the roasting furnace into the main exhaust duct 11. The main exhaust duct 11 serves as the primary flue gas transmission channel for the entire exhaust system, collecting the flue gas from the branch exhaust ducts 12 and transmitting it to the subsequent exhaust system.

[0028] The anti-leakage unit 20 includes a pipe joint 21, a positioning head 22, a limiting ring 23, and a positioning pipe 24. The pipe joint 21 is installed at a certain angle (15°-30°) at the bottom of the main exhaust pipe 11. One end of the positioning head 22 is inserted into the interior of the pipe joint 21, forming a fit with the inner wall of the pipe joint 21, which not only achieves precise connection and positioning but also maintains structural stability under high-temperature conditions. The limiting ring 23 is fixed to this end of the positioning head 22 and fits against the inner wall of the pipe joint 21, positioning the positioning head 22 and effectively forming a seal to prevent flue gas leakage. The other end of the positioning head 22 is connected to the exhaust branch pipe 12 through the positioning pipe 24. A thermal expansion layer 25 and a sealing rubber layer 26 are sequentially wrapped around the outer surface of the positioning head 22 from the inside to the outside.

[0029] In one example, the two ends of the positioning pipe 24 are connected to the positioning head 22 and the exhaust branch pipe 12 by quick-release clamps, respectively. The connection is equipped with a metal corrugated compensator, which can effectively absorb the displacement caused by thermal expansion and ensure the long-term stable operation of the flue gas transmission system.

[0030] In one example, the thermal expansion layer 25 can be made of materials such as nickel-titanium alloy, polypropylene, brass Invar alloy, or thermal expansion ceramics, with a Shore hardness of 65±5HA, maintaining good flexibility and resilience at high temperatures. In actual flue gas conditions of 180-600℃ in the roasting furnace, the thermal expansion material undergoes radial expansion as the temperature rises, with an expansion amount reaching 8%-12% of its original size. Through uniform circumferential extrusion, it pushes the sealing rubber to form an interference fit of 0.3-0.8mm, increasing the pressure on the sealing contact surface to 0.8-1.2MPa. Combined with the micron-level wavy texture design on the surface of the sealing rubber layer 26, multiple sealing barriers are formed, effectively preventing high-temperature flue gas from leaking along the gap between the pipe joint 21 and the positioning head 22.

[0031] During operation, the exhaust system is activated, creating negative pressure inside the main exhaust duct 11 and the branch exhaust duct 12. With a fan power of 150kW, the negative pressures inside the main exhaust duct 11 and the branch exhaust duct 12 are -2000pa and -250pa, respectively, and the flue gas inside the roasting furnace is discharged under the action of negative pressure. During the exhaust process, due to the inclined setting of the pipe joint 21, the flue gas can flow smoothly from the branch exhaust duct 12 into the main exhaust duct 11. At the same time, the thermal expansion material layer on the outer surface of the positioning head 22 expands under the action of high-temperature flue gas, compressing the sealing rubber layer 26 and making it tightly fit with the pipe joint 21, which can effectively prevent high-temperature flue gas leakage.

[0032] To improve the leak prevention effect, a fastening unit 30 is also included, which includes a positioning plate 31, a threaded rod 32, and a nut 33. There are two positioning plates 31, which are detachably and fixedly installed on the outside of the pipe joint 21 and the positioning head 22, respectively. Multiple threaded rods 32 are arranged at intervals around the circumference of the positioning plates 31. One end of the threaded rod 32 is fixed on one of the positioning plates 31, and the other end of the threaded rod 32 passes through the corresponding through hole on the other positioning plate 31. Nuts 33 are sleeved on the corresponding threaded rods 32 on both sides of the positioning plate 31. The outer side of the nut 33 is provided with anti-slip knurling to facilitate manual rotation operation.

[0033] By using a wrench or special tool to rotate the nut 33, the extension length of the threaded rod 32 can be precisely adjusted, thereby applying tension to the two positioning discs 31. When the tension reaches the set value, it can cause the pipe joint 21 and the positioning head 22 to fit tightly, ensuring the sealing and stability of the connection, preventing air leakage during the smoke exhaust process, reducing energy waste and environmental pollution, and protecting the health and safety of operators.

[0034] For ease of installation, both the pipe joint 21 and the positioning head 22 adopt an expanding interface structure on the outside and are installed opposite each other (i.e., the large ends are set opposite each other). The internal channel is truncated cone-shaped. The positioning plate 31 is installed on the outer expanding middle of the pipe joint 21 and the positioning head 22. When the rotating nut 33 applies a pulling force to the two positioning plates 31, the two positioning plates 31 can drive the pipe joint 21 and the positioning head 22 to move towards each other, ensuring a tight connection between the pipe joint 21 and the positioning head 22.

[0035] To improve flue gas extraction efficiency, the end of the main flue gas duct 11 is connected to the flue gas system via an arc-shaped duct 14. The bend angle of the arc-shaped duct 14 is set to 60°–20°, and its diameter is larger than that of the main flue gas duct 11. The bend angle of the upper part of the branch flue gas duct 12 is set to 30°–60°. The angle settings of the branch flue gas duct 12 and the arc-shaped duct 14 reduce the flow resistance of flue gas at the bends, allowing the flue gas to enter the flue gas system more smoothly, improving the flue gas extraction efficiency, ensuring that the flue gas generated by the roasting furnace can be discharged in a timely manner, and guaranteeing the normal operation of the roasting furnace.

[0036] For ease of installation, the main exhaust duct 11 is mounted on a support frame 13, which includes a positioning sleeve 131 and a positioning plate 132. The positioning sleeve 131 is fixedly installed on the outside of the main exhaust duct 11. The inner wall of the positioning sleeve 131 has anti-slip textures, and with the help of a ring-shaped fastening bolt structure, it can achieve a stable connection with the main exhaust duct 11. The positioning plate 132 is fixedly installed on the bottom of the positioning sleeve 131, ensuring that the positioning plate 132 is in close contact with the ground or other supporting surface, providing stable and reliable support for the entire exhaust frame. At the same time, the positioning plate 132 has pre-drilled mounting holes around its perimeter, facilitating secondary fixing to the foundation ground using anchor bolts, enhancing structural stability. Multiple support frames 13 stably support the main exhaust duct 11, ensuring the stability of the entire exhaust frame during operation.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A baking grate, characterized in that include: The exhaust unit (10) includes a main exhaust pipe (11) and exhaust branch pipes (12). One end of a plurality of exhaust branch pipes (12) is spaced apart on the main exhaust pipe (11), and the other end of the exhaust branch pipes (12) is used to connect to the roasting furnace. The anti-leakage unit (20) includes a pipe joint (21), a positioning head (22), a limiting ring (23), and a positioning pipe (24). The pipe joint (21) is installed at a predetermined inclined angle at the bottom of the main exhaust pipe (11). One end of the positioning head (22) is inserted into the inside of the pipe joint (21). The limiting ring (23) is fixed to the end of the positioning head (22) and fits against the inner wall of the pipe joint (21). The other end of the positioning head (22) is connected to the exhaust branch pipe (12) through the positioning pipe (24). The outer surface of the positioning head (22) is wrapped with a thermal expansion layer (25) and a sealing rubber layer (26) from the inside to the outside.

2. The calcining furnace exhaust rack according to claim 1, characterized in that, Also includes: The fastening unit (30) includes a positioning plate (31), a threaded rod (32), and a nut (33). There are two positioning plates (31), which are detachably and fixedly installed on the outside of the pipe joint (21) and the positioning head (22), respectively. One end of a plurality of threaded rods (32) is fixed on one of the positioning plates (31), and the other end of the threaded rod (32) passes through the other positioning plate (31). The nuts (33) are sleeved on both sides of the positioning plate (31) corresponding to the threaded rods (32).

3. The calcining furnace exhaust rack according to claim 2, characterized in that, The pipe joint (21) and the positioning head (22) adopt an expanding interface structure on the outside and are installed opposite each other. Their internal channels are truncated cone-shaped. The positioning plate (31) is located in the expanding middle part on the outside of the pipe joint (21) and the positioning head (22).

4. The calcining furnace exhaust rack according to claim 1, characterized in that, The thermal expansion layer (25) is made of nickel-titanium alloy, polypropylene, brass Invar alloy or thermal expansion ceramic.

5. The exhaust rack for the roasting furnace according to claim 1, characterized in that, The end of the main exhaust pipe (11) is connected to the exhaust system via an arc-shaped pipe (14).

6. The calcining furnace exhaust rack according to claim 5, characterized in that, The bend angle of the arc-shaped pipe (14) is set to 60° to 20° and its channel diameter is larger than that of the main exhaust pipe (11). The bend angle of the upper part of the exhaust branch pipe (12) is set to 30° to 60°.

7. The calcining furnace exhaust rack according to claim 1, characterized in that, The axis of the pipe joint (21) is inclined at an angle of 15° to 30° to the horizontal plane.

8. The calcining furnace exhaust rack according to claim 1, characterized in that, The main exhaust pipe (11) is installed on the support frame (13). The support frame (13) includes a positioning sleeve (131) and a positioning plate (132). The positioning sleeve (131) is fixedly installed on the outside of the main exhaust pipe (11), and the positioning plate (132) is fixedly installed on the bottom of the positioning sleeve (131).

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