Annular exhaust device for pit type heat treatment furnace

Abstract

The utility model discloses an annular exhaust device for a pit type heat treatment furnace. The annular exhaust device comprises an exhaust pipeline arranged on a furnace cover, the exhaust pipeline comprises an annular air pipe, an exhaust main pipe rotating section and an exhaust main pipe fixing section which are communicated in sequence; a main support fixed to the ground is arranged on one side of the exhaust pipeline, and the top of the main support supports the exhaust main pipe fixing section. The exhaust main pipe rotating section is connected with the main support through a first rotating connecting mechanism. An air pipe header is arranged between the annular air pipe and the rotating section of the exhaust main pipe, and the air pipe header is connected with the main support through a second rotating connecting mechanism; and the rotating center of the first rotary connecting mechanism, the rotating center of the second rotary connecting mechanism and the rotating shaft of the furnace cover are coaxially arranged. According to the utility model, through symmetrical shunting of the annular air pipe and the rotary connecting mechanism, the exhaust efficiency is improved, the maintenance period is prolonged, the operation process is simplified, and the stability in the synchronous rotating process of the exhaust pipeline and the furnace cover is improved.

Description

Technical Field

[0001] This utility model relates to the field of industrial heat treatment technology, specifically to an annular exhaust device for a pit-type heat treatment furnace. Background Technology

[0002] Pit-type heat treatment furnaces utilize a pit-shaped structure to fully utilize the furnace space, ensuring uniform temperature distribution and improving heat treatment efficiency. Their heating system employs electric heating elements or gas burners, and protective gases or controlled atmospheres are introduced according to process requirements to regulate the microstructure and properties of the metal materials. After heat treatment, the mechanical properties, corrosion resistance, and fatigue life of the metal materials will be significantly improved.

[0003] When the furnace lid is opened and the workpiece is removed after heating, the high-temperature harmful gases inside the pit furnace will escape into the factory building. This escape will cause the ambient temperature inside the factory to rise, requiring additional air conditioning and ventilation equipment to maintain a comfortable temperature, thus increasing construction costs. Furthermore, the harmful gases inside the furnace will affect the health of the operators.

[0004] Chinese utility model patent CN214244523U discloses an annular slotted gas collection hood for a heat treatment pit furnace. This device captures oil fumes through slotted openings at the bottom of the annular hood and discharges them directionally via a rotating flange and vertical ventilation duct, achieving synchronous rotation between the gas collection hood and the furnace cover, thus avoiding manual disassembly. However, the right-angle airflow path from the annular cavity to the vertical duct creates turbulent vortices, significantly increasing airflow resistance and leading to higher energy consumption. It also easily causes soot buildup, increasing maintenance costs. Furthermore, the exhaust pipe lacks stable support, making it prone to swaying during operation, resulting in lower safety and instability. Utility Model Content

[0005] The present invention aims to provide an annular exhaust device for a pit-type heat treatment furnace, which can simplify the operation process and improve the gas collection efficiency.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An annular exhaust device for a pit-type heat treatment furnace includes an exhaust pipe installed on the furnace cover; the exhaust pipe includes an annular duct, a rotating section of the main exhaust pipe, and a fixed section of the main exhaust pipe connected in sequence.

[0008] The exhaust pipe is provided with a main support fixed to the ground on one side, and the top of the main support supports the fixed section of the exhaust pipe.

[0009] The rotating section of the exhaust main pipe is connected to the main support through a first rotating connection mechanism;

[0010] A duct header is provided between the annular duct and the rotating section of the main exhaust duct, and the duct header is connected to the main support through a second rotating connection mechanism.

[0011] The rotation center of the first rotary connection mechanism and the rotation center of the second rotary connection mechanism are coaxially arranged with the rotation axis of the furnace cover.

[0012] During operation, the annular exhaust device optimizes the airflow path and improves exhaust efficiency by employing an annular duct and header for airflow guidance. The combination of the first and second rotary connecting mechanisms enables synchronous rotation of the exhaust pipe and the furnace cover, simplifying the workflow. Once the furnace cover begins to rotate, the first and second rotary connecting mechanisms rotate synchronously around the same axis of rotation, further simplifying the operation and improving work efficiency.

[0013] Based on the embodiments of this utility model, further optimizations can be made to this utility model. The optimized technical solutions are as follows:

[0014] In one preferred embodiment, the annular duct and the duct header are connected by a flexible hose and an exhaust branch pipe, and the flexible hose achieves displacement compensation when the furnace cover is raised and lowered.

[0015] In one preferred embodiment, two sets of retractable flexible hoses are symmetrically arranged on both sides of the annular duct, and the two sets of retractable flexible hoses are connected to the duct header through corresponding exhaust branch pipes. Thus, by symmetrically diverting the airflow through the annular duct and guiding it through the duct header, soot accumulation is avoided, and exhaust efficiency is improved.

[0016] In one preferred embodiment, the first rotary connection mechanism includes a rotary sleeve bracket and a rotary sleeve fitted on the rotary section of the exhaust main pipe. The rotary sleeve is connected to the top of the main bracket through the rotary sleeve bracket, which provides stable support for the rotary section of the exhaust main pipe.

[0017] In one preferred embodiment, the second rotary connection mechanism includes a rotating shaft, a header branch pipe fixing bracket, and a header branch pipe rotating bracket. One end of the header branch pipe rotating bracket is connected to one end of the header branch pipe fixing bracket via the rotating shaft, and the other end of the header branch pipe rotating bracket is fixed to the air duct header. The other end of the header branch pipe fixing bracket is fixed to the main bracket. Thus, the second rotary connection mechanism not only enables the exhaust pipe to rotate coaxially with the furnace cover, but also provides a certain degree of support for the exhaust pipe.

[0018] In one preferred embodiment, the end of the header branch pipe rotating support away from the main support is provided with a steering support whose lower end is fixed on the furnace cover, and the steering support constrains the horizontal displacement of the header branch pipe rotating support.

[0019] This invention proposes an annular exhaust device for a pit-type heat treatment furnace. The invention employs a first rotary connection mechanism and a second rotary connection mechanism to achieve synchronous lifting and rotation of the exhaust pipe and the furnace cover, simplifying the intermediate operation process and improving work efficiency. At the same time, the optimization of the airflow path also improves the exhaust efficiency, and the symmetrical design of the pipeline avoids the accumulation of soot and extends the service life.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The annular duct symmetrical flow splitting and header guiding structure of this utility model reduces airflow disturbance, reduces pressure difference fluctuation, and reduces effective air volume loss through uniform flow splitting, thereby improving exhaust efficiency; at the same time, the symmetrical layout also avoids local soot accumulation and extends the maintenance cycle.

[0022] 2. By setting the first rotary connection mechanism, the second rotary connection mechanism and the rotating shaft of the furnace cover coaxially, this utility model not only realizes the synchronous rotation of the exhaust pipe and the furnace cover, but also improves the stability of the exhaust pipe and the furnace cover during synchronous rotation, simplifies the operation process, improves work efficiency, and is suitable for complex pipeline scenarios.

[0023] 3. This utility model reduces the shaking caused by airflow in the exhaust pipe during operation by using a rotating sleeve support, a fixed support for the manifold branch pipe, and a rotating support for the manifold branch pipe. This improves the stability of the exhaust pipe during the lifting and rotation of the furnace cover, thereby increasing the safety and reliability of the exhaust pipe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the annular exhaust device of a well-type heat treatment furnace according to this utility model.

[0025] Figure 2 yes Figure 1 A top-view structural diagram.

[0026] Figure 3 This is a partial structural diagram of the connection between the ring duct, flexible hose, and exhaust branch pipe.

[0027] Figure 4 This is a schematic diagram of the distribution of the ring-shaped duct support.

[0028] In the diagram: 1. Annular duct; 2. Strip air inlet; 3. Flexible hose; 4. Exhaust branch pipe; 5. Duct header; 6. Rotating section of main exhaust pipe; 7. Fixed section of main exhaust pipe; 8. Rotating sleeve; 9. Annular duct support; 10. Main support; 11. Rotating sleeve support; 12. Rotating support for header branch pipe; 13. Rotating shaft; 14. Steering support; 15. Fixed support for header branch pipe; 16. Reinforcing rib; 17. Ground; 18. Exhaust outlet; 19. Heat treatment furnace; 20. Furnace cover; 21. Reducing pipe; 22. Motor; 23. Rotating shaft; 24. Exhaust pipeline. Detailed Implementation

[0029] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0030] Please see Figures 1-4 As shown, this embodiment provides an annular exhaust device for a pit-type heat treatment furnace, including an exhaust pipe 24 installed on the furnace cover 20; the exhaust pipe 24 includes an annular air duct 1, a retractable flexible hose 3, an exhaust branch pipe 4, an air duct manifold 5, an exhaust main rotating section 6, and an exhaust main fixed section 7 connected in sequence; a main support 10 fixed to the ground 17 is provided on one side of the exhaust pipe 24, and the top of the main support 10 supports the exhaust main fixed section 7; the exhaust main rotating section 6 is connected to the main support 10 through a first rotating connecting mechanism; an air duct manifold 5 is provided between the annular air duct 1 and the exhaust main rotating section 6, and the air duct manifold 5 is connected to the main support 10 through a second rotating connecting mechanism; the rotation center of the first rotating connecting mechanism and the rotation center of the second rotating connecting mechanism are coaxially arranged with the rotation axis 23 of the furnace cover 20.

[0031] The annular duct 1 and the duct header 5 are connected by a flexible hose 3 and an exhaust branch pipe 4; two sets of flexible hoses 3 are symmetrically arranged on both sides of the annular duct 1, and the two sets of flexible hoses 3 are connected to the duct header 5 through corresponding exhaust branch pipes 4; the annular duct 1 and the flexible hoses 3 are connected by a reducing pipe 21; the first rotating connection mechanism includes a rotating sleeve bracket 11 and a rotating sleeve 8 fitted on the rotating section 6 of the exhaust main pipe, and the rotating sleeve 8 is connected to the upper part of the main support 10 through the rotating sleeve bracket 11; the second rotating connection mechanism includes a rotating shaft 13, a header branch pipe fixing bracket 15 and a header branch pipe rotating bracket 12; one end of the header branch pipe rotating bracket 12 is connected to one end of the header branch pipe fixing bracket 15 through the rotating shaft 13, the other end of the header branch pipe rotating bracket 12 is fixed to the duct header 5, and the other end of the header branch pipe fixing bracket 15 is fixed to the main support 10. A motor 22 is installed above the furnace cover, and the motor 22 drives the furnace cover 20 to rotate in a plane around the rotating shaft 23. The rotating shaft 13 can be a cylindrical pin, and the retractable hose 3 can be a titanium silicate hose.

[0032] The header branch pipe rotating support 12, located away from the main support 10, has a swivel support 14 whose lower end is fixed to the furnace cover 20. The swivel support 14 is welded to the furnace cover 20. Parallel vertically spaced angle steels are used to horizontally limit the end of the header branch pipe rotating support 12 away from the main support 10, placing the end of the header branch pipe rotating support 12 away from the main support 10 in the gap between the two angle steels of the swivel support 14. The header branch pipe rotating support 12 is not welded to the swivel support 14 and can move up and down.

[0033] The annular duct support 9 is radially distributed around the furnace cover 20 and welded to it. The annular duct 1 is placed above the annular duct support 9, and the annular duct 1 and the annular duct support 9 are connected by welding. The annular duct support 9 is made of stainless steel angle steel. Reinforcing ribs 16 are provided at the fixed connection between the upper part of the main support 10 and the rotating sleeve support 11, and at the fixed connection between the middle part of the main support 10 and the rotating support 12 of the header branch pipe.

[0034] Specific embodiments of this utility model:

[0035] When the heat treatment furnace 19 is opened, the furnace cover 20 moves upward, and the annular air duct 1 and the steering bracket 14 move upward accordingly. Since one end of the manifold branch pipe rotating bracket 12 is connected to the manifold branch pipe fixed bracket 15 via a cylindrical pin, it can rotate but cannot move up or down. The manifold branch pipe fixed bracket 15 is fixed in the middle of the main bracket 10, and the middle part of the manifold branch pipe rotating bracket 12 is fixed below the air duct manifold 5. The other end of the manifold branch pipe rotating bracket 12 is not welded to the steering bracket 14 and can move between the two angle steels of the steering bracket 14. Therefore, during the raising and lowering of the furnace cover 20, the position of the manifold branch pipe rotating bracket 12 remains unchanged, the annular exhaust duct 1 moves upward, and the titanium silicate flexible hose shortens to compensate for the displacement. At this time, the high-temperature harmful gases escaping from the furnace cover 20 are drawn into the annular air duct 1 through the strip-shaped air inlet 2. The high-temperature harmful gases flow to both sides in the annular air duct 1, and converge into the air duct manifold 5 via the titanium silicate flexible hose and the exhaust branch pipe 4. Finally, the exhaust gas is discharged to the designated emission area via the rotating section 6 of the exhaust main pipe and the fixed section 7 of the exhaust main pipe.

[0036] After a large amount of high-temperature harmful gases inside the furnace are completely discharged, the furnace cover 20 of the heat treatment furnace 19 rotates and opens around the rotation axis 23. The cylindrical pin in the manifold branch pipe rotating bracket 12 is on the same axis as the rotation axis 23 of the furnace cover 20. At this time, the manifold branch pipe rotating bracket 12 rotates synchronously with the furnace cover 20 due to the restriction of the steering bracket 14. Because the air duct manifold 5 is fixed in the middle of the manifold branch pipe rotating bracket 12, the air duct manifold 5 and the exhaust branch pipe 4 connected to it can also rotate synchronously with the furnace cover. At the same time, the exhaust main pipe rotating section 6 can also rotate synchronously with the furnace cover 20 because the rotation axis of the rotating sleeve 8 is on the same axis as the rotation axis 23 of the furnace cover 20. In summary, when the furnace cover 20 starts to rotate, the annular exhaust device, except for the exhaust main pipe fixed section 7, can rotate synchronously with the furnace cover 20. The exhaust main pipe fixed section 7 is located at the top of the main bracket 10, discharging the exhaust gas to the designated discharge area.

[0037] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the embodiments by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

Claims

1. An annular exhaust device for a pit-type heat treatment furnace, comprising an exhaust pipe (24) installed on the furnace cover (20); the exhaust pipe (24) comprising an annular duct (1), a rotating section (6) of the main exhaust pipe, and a fixed section (7) of the main exhaust pipe connected in sequence; characterized in that: The exhaust pipe (24) has a main support (10) with its bottom fixed to the ground (17) on one side, and the top of the main support (10) supports the fixed section (7) of the exhaust pipe. The exhaust main rotating section (6) is connected to the main support (10) through the first rotating connecting mechanism; A duct header (5) is provided between the annular duct (1) and the rotating section (6) of the exhaust main pipe. The duct header (5) is connected to the main support (10) through a second rotating connection mechanism. The rotation center of the first rotary connection mechanism and the rotation center of the second rotary connection mechanism are coaxially arranged with the rotation axis (23) of the furnace cover (20).

2. The annular exhaust device for a pit-type heat treatment furnace according to claim 1, characterized in that: The annular duct (1) and the duct header (5) are connected by a flexible hose (3) and an exhaust branch pipe (4).

3. The annular exhaust device for a pit-type heat treatment furnace according to claim 2, characterized in that: Two sets of retractable hoses (3) are symmetrically arranged on both sides of the annular duct (1). The two sets of retractable hoses (3) are connected to the duct header (5) through corresponding exhaust branch pipes (4).

4. The annular exhaust device for a pit-type heat treatment furnace according to claim 1, characterized in that: The first rotating connection mechanism includes a rotating sleeve bracket (11) and a rotating sleeve (8) fitted on the rotating section (6) of the exhaust main pipe. The rotating sleeve (8) is connected to the top of the main support (10) through the rotating sleeve bracket (11).

5. The annular exhaust device for a pit-type heat treatment furnace according to claim 1, characterized in that: The second rotating connection mechanism includes a rotating shaft (13), a manifold branch pipe fixing bracket (15), and a manifold branch pipe rotating bracket (12); one end of the manifold branch pipe rotating bracket (12) is connected to one end of the manifold branch pipe fixing bracket (15) through the rotating shaft (13), the other end of the manifold branch pipe rotating bracket (12) is fixed on the air duct manifold (5), and the other end of the manifold branch pipe fixing bracket (15) is fixed on the main bracket (10).

6. The annular exhaust device for a pit-type heat treatment furnace according to claim 5, characterized in that: The rotating support (12) of the manifold branch pipe has a turning support (14) at the end away from the main support (10), with its lower end fixed on the furnace cover (20).

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