A dual-station enclosed railway locomotive testing exhaust system
By designing a dual-station enclosed railway locomotive test exhaust equipment and adopting protective and adjustment components, the problems of easy collision and scratching during docking and poor sealing self-adaptation of existing equipment have been solved. This enables dual-station parallel testing and exhaust gas purification, improving equipment stability and environmental compliance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA HUAXI ENG DESIGN CONSTR CO LTD
- Filing Date
- 2026-05-27
- Publication Date
- 2026-06-30
AI Technical Summary
Existing exhaust equipment for railway locomotive testing is mostly single-station and open-structure, which cannot be compatible with dual-station parallel testing. It has problems such as easy collision and scratching during docking, poor sealing and self-adaptation, and easy leakage of exhaust gas, resulting in insufficient equipment stability and service life.
A dual-station enclosed railway locomotive test exhaust device was designed, employing protective and adjusting components, including fixed columns, sliding columns, rotating columns, and protective sleeves, to achieve adaptive protection and sealing during the docking process. The coaxiality and sealing of the docking are ensured through the cooperation of arc-shaped sliding grooves and annular grooves. Furthermore, dual-station simultaneous testing and exhaust gas purification are achieved through independent exhaust channels and functional module components.
It improves the stability and service life of the equipment, reduces the risk of exhaust gas leakage, enhances the safety and environmental compliance of testing operations, and strengthens the versatility and efficiency of the equipment.
Smart Images
Figure CN224435799U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of environmental protection ventilation equipment for rail transit, specifically a dual-station enclosed railway locomotive testing exhaust device. Background Technology
[0002] During factory testing, routine maintenance, and performance testing of railway locomotives, the engines need to operate under no-load or load, continuously generating large amounts of high-temperature exhaust gas, carbon black particles, and high noise. If these gases directly diffuse into the testing workshop, they will severely pollute the working environment and affect the accuracy of testing. Therefore, dedicated exhaust equipment is usually required to centrally collect, purify, and safely discharge the exhaust gases, ensuring that testing work is carried out safely, environmentally friendly, and efficiently.
[0003] Existing locomotive testing exhaust equipment is mostly single-station, open-structure, and generally suffers from many defects: the system only supports single-station operation and cannot be compatible with dual-station parallel testing, resulting in low overall operating efficiency; the exhaust gas docking device lacks a dedicated protective structure, making it prone to rigid collisions, eccentric misalignment, and surface scratches when docking with the locomotive exhaust pipe, directly causing damage to the pipeline and sealing joint; the sealing structure has weak self-adjustment capability, making it difficult to adapt to different pipe diameters and docking deviations, and easily causing exhaust gas leakage due to uneven gaps and poor fit, resulting in decreased equipment sealing performance, loss of negative pressure, and accelerated component wear, significantly reducing the equipment's operational stability and service life.
[0004] In view of this, we propose a dual-station enclosed railway locomotive testing exhaust device. Utility Model Content
[0005] The purpose of this utility model is to provide a dual-station enclosed railway locomotive test exhaust device. This dual-station enclosed railway locomotive test exhaust device solves the problems of low efficiency of single station, easy collision and scratch during docking, poor sealing and self-adaptation, easy leakage of exhaust gas, and insufficient equipment stability and service life of traditional locomotive test exhaust devices.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A dual-station enclosed railway locomotive testing exhaust device includes an exhaust device body, which comprises: an enclosed soundproof chamber, an exhaust channel assembly, a docking sealing mechanism, a functional module assembly, an exhaust assembly, and a damper switching mechanism; it also includes a protection component for surface protection during quick connection of the exhaust channel and the locomotive exhaust pipe; and an adjustment component for pressure adjustment at the connection between the exhaust channel and the locomotive exhaust pipe; the protection component includes: a fixing column installed on the surface of the exhaust channel, with a sliding column slidably connected inside the fixing column, the sliding column being installed on the surface of the docking sealing mechanism, and a fixing rod installed inside the sliding column. A rotating column is slidably connected to the surface of the fixed rod. The rotating column is rotatably connected to the inner side of the sliding column. A connecting column is installed on the outer wall of the rotating column. A sliding plate is slidably connected to the surface of the connecting column. The sliding plate is slidably connected to the inside of the fixed column. A limiting column is slidably connected to the inside of the connecting column. A limiting block is installed on the outer side of the limiting column. The limiting block is slidably connected to the inner wall of the fixed column. A threaded column is installed inside the limiting block. A sliding sleeve is threadedly connected to the inner side of the threaded column. A connecting rod is installed on the outer side of the sliding sleeve. The connecting rod is slidably connected to the inside of the fixed column. A protective sleeve is installed on the outer side of the connecting rod. The protective sleeve is disposed on the surface of the exhaust channel.
[0008] Preferably, the rotating column has an arc-shaped groove on its surface, and the connecting rod has a cross-shaped cross section.
[0009] Preferably, the fixing column has an annular groove one inside, and a strip groove and an annular groove two inside, and the strip groove and annular groove two are interconnected.
[0010] Preferably, the adjusting component includes a fixing ring, which is installed on the inner wall of the protective sleeve. A locking block is installed on the inner side of the fixing ring, and a sealing block is slidably connected inside the locking block. An adjusting spring is installed on the outer side of the sealing block, and the adjusting spring is installed on the inner wall of the locking block.
[0011] Preferably, the exhaust channel assembly includes two sets of independent exhaust channels arranged symmetrically on the left and right sides. The axes of the two sets of independent exhaust channels are parallel to the symmetrical center line of the enclosed soundproof cabin, and the air inlet end of each set of independent exhaust channels extends to the side wall opening of the enclosed soundproof cabin. The exhaust end is sealed and connected to the exhaust assembly through a manifold.
[0012] Preferably, the functional module components are connected in series in the middle section of the independent exhaust channel, including a muffler module and a particulate filter module connected in parallel. The damper switching mechanism is an electric three-way reversing valve, whose input end is connected to the independent exhaust channel, and whose output end is sealed and connected to the input ends of the muffler module and the particulate filter module respectively. The output ends of the muffler module and the particulate filter module are connected to the manifold.
[0013] Preferably, the exhaust assembly includes a shared centrifugal induced draft fan and a main exhaust system. The input end of the centrifugal induced draft fan is sealed to the manifold, and the output end is fixedly connected to the main exhaust system. The end of the main exhaust system extends to the outside of the enclosed soundproof chamber and is bent upward.
[0014] By employing the above technical solution, this utility model provides a dual-station enclosed railway locomotive testing exhaust device. It possesses at least the following beneficial effects:
[0015] (1) Through the setting of the protective components, when the docking sealing mechanism extends to dock with the locomotive exhaust pipe, the sliding column slides forward along the fixed column and drives the fixed rod and rotating column to move axially, and the connecting column drives the sliding plate to slide. After the sliding plate enters the position where the strip groove and the annular groove are connected, it rotates with the annular groove due to circumferential contact, which in turn drives the rotating column to rotate. The arc-shaped sliding groove provides guidance and limit. The rotating column drives the limiting column and the limiting block to rotate, so that the threaded column drives the sliding sleeve to feed axially. The sliding sleeve pushes the connecting rod and the protective sleeve to cover the exhaust channel, realizing guidance, centering and sealing fit, reducing leakage and wear, and improving the stability and service life of the equipment.
[0016] (2) By adjusting the configuration of the components, when the protective sleeve covers the exhaust channel and is connected, the fixing ring moves synchronously, the inner locking block provides radial support for the sealing block, and the sealing block abuts against the outer wall of the locomotive exhaust pipe under the thrust of the adjusting spring. It automatically adapts to pipe diameter differences, docking eccentricity and depth deviation by relying on elastic expansion and contraction, and compensates for docking gap in real time. Multiple sets of sealing blocks form an encircling annular sealing band, which reliably blocks exhaust gas leakage, maintains a closed negative pressure state in the exhaust passage, ensures stable docking sealing effect, and improves the safety of testing operations and environmental compliance. Attached Figure Description
[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:
[0018] Figure 1 This is a schematic diagram of the overall front view of the present invention;
[0019] Figure 2 This is a schematic diagram of the overall front structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the structure for removing the enclosed soundproof chamber in this utility model;
[0021] Figure 4 This is a schematic diagram of the connection structure of the protection component and the adjustment component in this utility model;
[0022] Figure 5 This is a front view schematic diagram of the protective component in this utility model;
[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the protective sleeve in this utility model;
[0024] Figure 7 This is a schematic diagram of the cross-sectional structure of the fixed column in this utility model;
[0025] Figure 8 This is a front view schematic diagram of the adjustment component in this utility model.
[0026] In the diagram: 1. Exhaust equipment body; 11. Enclosed soundproof chamber; 12. Exhaust channel assembly; 13. Docking sealing mechanism; 14. Functional module assembly; 15. Exhaust assembly; 16. Damper switching mechanism; 2. Protection assembly; 21. Fixed column; 22. Sliding column; 23. Fixed rod; 24. Rotating column; 25. Connecting column; 27. Slide plate; 28. Limiting column; 213. Limiting block; 29. Threaded column; 210. Sliding sleeve; 211. Connecting rod; 212. Protective sleeve; 240. Arc-shaped slide groove; 2100. Annular groove one; 2101. Strip groove; 2102. Annular groove two; 3. Adjustment assembly; 31. Fixed ring; 32. Locking block; 33. Sealing block; 34. Adjusting spring; 141. Silencing module; 142. Particle filter module; 151. Centrifugal induced draft fan; 152. Main pipe exhaust system. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] Example 1
[0029] A dual-station enclosed railway locomotive testing exhaust system, such as Figure 1 - Figure 7 As shown, the exhaust equipment body 1 includes: a closed soundproof chamber 11, an exhaust channel assembly 12, a docking sealing mechanism 13, a functional module assembly 14, an exhaust assembly 15, and a damper switching mechanism 16.
[0030] It also includes protective component 2, which protects the surface of the exhaust passage when it is quickly connected to the locomotive exhaust pipe;
[0031] Adjustment component 3 is used for pressure adjustment at the connection between the exhaust passage and the locomotive exhaust pipe;
[0032] First, the protective component 2 includes: a fixed post 21, which is mounted on the surface of the exhaust channel; a sliding post 22 is slidably connected inside the fixed post 21; the sliding post 22 is mounted on the surface of the docking sealing mechanism 13; a fixed rod 23 is installed inside the sliding post 22; a rotating post 24 is slidably connected to the surface of the fixed rod 23; the rotating post 24 is rotatably connected to the inner side of the sliding post 22; a connecting post 25 is mounted on the outer wall of the rotating post 24; a sliding plate 27 is slidably connected to the surface of the connecting post 25; the sliding plate 27 is slidably connected to the inside of the fixed post 21; a limiting post 28 is slidably connected inside the connecting post 25; and a limiting post 28 is slidably connected to the outside of the limiting post 28. A limiting block 213 is installed on the side, and the limiting block 213 is slidably connected to the inner wall of the fixed column 21. A threaded column 29 is installed inside the limiting block 213, and a sliding sleeve 210 is threadedly connected to the inner side of the threaded column 29. A connecting rod 211 is installed on the outer side of the sliding sleeve 210, and the connecting rod 211 is slidably connected to the inside of the fixed column 21. A protective sleeve 212 is installed on the outer side of the connecting rod 211. The protective sleeve 212 is set on the surface of the exhaust channel. By setting the protective sleeve 212, the docking process is automatically covered and protected to avoid pipeline collision, scratching and eccentric misalignment, and improve the docking coaxiality and the sealing performance of the docking.
[0033] Secondly, the rotating column 24 has an arc-shaped groove 240 on its surface, and the connecting rod 211 has a cross-shaped cross section. The arc-shaped groove 240 limits the rotation trajectory, and the cross-shaped connecting rod 211 improves the stability of the protective sleeve 212 connection, prevents jamming and displacement, and ensures accurate and reliable operation.
[0034] Furthermore, the fixed post 21 has an annular groove 2100 inside, which allows the limiting block 213 to rotate and restricts its movement. The fixed post 21 also has a strip groove 2101 and an annular groove 2102 inside, which are interconnected. This interconnection allows the sliding plate 27 to perform a composite motion of first linear movement and then rotation, so that the protective sleeve 212 can unfold and retract according to a preset trajectory.
[0035] In this embodiment, with the setting of the protection component 2, when the docking sealing mechanism 13 extends to dock with the locomotive exhaust pipe, the sliding column 22 slides forward along the fixed column 21, and drives the fixed rod 23 and the rotating column 24 to move axially. The connecting column 25 drives the sliding plate 27 to slide. After the sliding plate 27 enters the position where the strip groove 2101 and the annular groove 2102 are connected, it rotates with the annular groove 2102 due to circumferential contact, thereby driving the rotating column 24 to rotate. The arc-shaped sliding groove 240 provides guidance and limitation. The rotating column 24 drives the limiting column 28 and the limiting block 213 to rotate, so that the threaded column 29 drives the sliding sleeve 210 to feed axially. The sliding sleeve 210 pushes the connecting rod 211 and the protective sleeve 212 to cover the exhaust channel, realizing guidance, centering and sealing fit, reducing leakage and wear, and improving equipment stability and life.
[0036] Example 2
[0037] like Figure 8 As shown, the adjusting component 3 includes a fixing ring 31, which is installed on the inner wall of the protective sleeve 212. A locking block 32 is installed on the inner side of the fixing ring 31. A sealing block 33 is slidably connected inside the locking block 32. An adjusting spring 34 is installed on the outer side of the sealing block 33. The adjusting spring 34 is installed on the inner wall of the locking block 32. Through the elastic adaptive structure, automatic compensation of docking pressure and gap sealing are realized, adapting to the difference in trolley pipe diameter and docking eccentricity, and improving sealing reliability.
[0038] Furthermore, the exhaust channel assembly 12 includes two sets of independent exhaust channels arranged symmetrically on the left and right. The axes of the two sets of independent exhaust channels are parallel to the symmetrical center line of the enclosed soundproof chamber 11, and the air inlet end of each set of independent exhaust channels extends to the side wall opening of the enclosed soundproof chamber 11. The exhaust end is sealed and connected to the exhaust assembly 15 through a manifold. Through the symmetrical layout of the two independent channels, the simultaneous testing of two workstations can be achieved without interference, thereby improving work efficiency and ensuring stable airflow delivery.
[0039] Furthermore, the functional module component 14 is connected in series in the middle section of the independent exhaust channel, including a muffler module 141 and a particulate filter module 142 connected in parallel. The damper switching mechanism 16 is an electric three-way reversing valve, whose input end is connected to the independent exhaust channel, and whose output end is sealed and connected to the input ends of the muffler module 141 and the particulate filter module 142 respectively. The output ends of the muffler module 141 and the particulate filter module 142 are connected to the manifold. Through the switchable functional module component 14, the muffler and filter modes can be quickly switched to adapt to different test conditions and improve the versatility of the equipment.
[0040] Finally, the exhaust assembly 15 includes a shared centrifugal induced draft fan 151 and a main exhaust system 152. The input end of the centrifugal induced draft fan 151 is sealed to the manifold, and the output end is fixedly connected to the main exhaust system 152. The end of the main exhaust system 152 extends to the outside of the enclosed soundproof chamber 11 and bends upward. Through centralized ventilation and high-altitude discharge, the exhaust gas is collected under negative pressure, does not overflow, and does not backflow, thus meeting the requirements for environmental protection emissions and noise control.
[0041] In this embodiment, by adjusting the configuration of component 3, when the protective sleeve 212 covers the exhaust channel and is connected, the fixing ring 31 moves synchronously, and the inner locking block 32 provides radial support for the sealing block 33. Under the thrust of the adjusting spring 34, the sealing block 33 presses against the outer wall of the locomotive exhaust pipe, automatically adapting to differences in pipe diameter, docking eccentricity, and depth deviation through elastic expansion and contraction, and compensating for docking gaps in real time. Multiple sets of sealing blocks 33 form an encircling annular sealing band, reliably blocking exhaust gas leakage, maintaining a closed negative pressure state in the exhaust passage, ensuring stable docking sealing effect, and improving the safety and environmental compliance of testing operations.
[0042] Working principle: The entire equipment is based on the exhaust equipment body 1. All functional components are integrated and installed inside the closed soundproof chamber 11. Through the coordinated action of the exhaust channel assembly 12, docking sealing mechanism 13, functional module assembly 14, exhaust assembly 15 and damper switching mechanism 16, and in conjunction with the protection component 2 and adjustment component 3, safe, sealed and adjustable exhaust gas collection, purification, noise reduction and centralized emission are achieved.
[0043] After the equipment is started, the exhaust pipes of the railway locomotives at the two test stations quickly connect with the docking sealing mechanism 13. The fixed column 21, sliding column 22, and protective sleeve 212 in the protection component 2 move synchronously, forming a protective layer on the surface of the exhaust channel during the docking process to prevent collision and wear. The adjustment component 3 automatically adjusts the sealing pressure at the docking position through the fixed ring 31, the locking block 32, the sealing block 33, and the adjusting spring 34 to ensure a tight and leak-proof connection.
[0044] When the docking sealing mechanism 13 extends to dock with the locomotive exhaust pipe, the sliding column 22 fixed on the docking sealing mechanism 13 slides forward synchronously along the inner wall of the fixed column 21; the sliding column 22 drives the internal fixed rod 23 to move axially together with the rotating column 24; the connecting column 25 on the outer wall of the rotating column 24 drives the sliding plate 27 to slide along the inside of the fixed column 21. When the connecting column 25 slides, it slides relative to the surface of the limiting column 28; when the sliding plate 27 slides laterally in the strip groove 2101 opened inside the fixed column 21 to the position where the strip groove 2101 and the second annular groove 2102 are connected, the side wall of the second annular groove 2102 forms a circumferential abutment against the sliding plate 27, forcing the sliding plate 27 to rotate circumferentially along the second annular groove 2102, and then drives the rotating column 24 to rotate around the fixed rod 23 through the connecting column 25. During the rotation of the rotating column 24, the arc-shaped groove 240 on its surface provides guidance and limit for the rotation trajectory, ensuring smooth and reliable rotation. As the rotating column 24 rotates, the connecting column 25 synchronously drives the limiting column 28 and the limiting block 213 to rotate along the inner wall of the fixed column 21. The limiting block 213 drives the internal threaded column 29 to rotate, causing the sliding sleeve 210 to make axial feed motion along the threaded column 29. The sliding sleeve 210 pushes the connecting rod 211 to make axial movement. The connecting rod 211 drives the protective sleeve 212 to move along the surface of the exhaust channel, completely covering the outside of the exhaust channel. Through precise guidance and flexible covering, the coaxiality and sealing fit of the docking are improved, ensuring the sealing of the docking, reducing the risk of exhaust gas leakage, and improving the stability and service life of the equipment.
[0045] When the protective sleeve 212 covers the outside of the exhaust passage and connects with the locomotive exhaust pipe, the fixing ring 31 installed on the inner wall of the protective sleeve 212 moves along with it. The evenly distributed locking blocks 32 on the inner side of the fixing ring 31 provide radial support for the sealing block 33. Under the elastic thrust of the adjusting spring 34, the sealing block 33 extends inward along the inner wall of the locking block 32 and presses tightly against the outer wall of the locomotive exhaust pipe. By adjusting the elastic extension and contraction characteristics of the adjusting spring 34, it automatically adapts to different pipe diameters, different docking eccentricities, and different docking depths, and compensates for the docking gap in real time. At the same time, through the circumferential fit of multiple sets of sealing blocks 33, a continuous and reliable annular sealing strip is formed at the docking position, effectively blocking the leakage of exhaust gas from the docking gap and ensuring that the entire exhaust passage is in a closed negative pressure state.
[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A dual-station enclosed railway locomotive testing exhaust device, comprising an exhaust device body (1), characterized in that: The exhaust equipment body (1) includes: a closed soundproof chamber (11), an exhaust channel assembly (12), a docking sealing mechanism (13), a functional module assembly (14), an exhaust assembly (15), and a damper switching mechanism (16). It also includes a protective component (2) for protecting the surface of the exhaust passage when it is quickly connected to the locomotive exhaust pipe; Adjustment component (3) is used to adjust the pressure at the connection between the exhaust passage and the locomotive exhaust pipe; The protective component (2) includes: a fixed column (21), which is installed on the surface of the exhaust channel. A connecting column (25) is provided inside the fixed column (21). A sliding plate (27) is slidably connected to the surface of the connecting column (25). The sliding plate (27) is slidably connected inside the fixed column (21). A limiting column (28) is slidably connected inside the connecting column (25). A limiting block (213) is installed on the outside of the limiting column (28). The limiting block (213) is slidably connected to the inner wall of the fixed column (21). A threaded column (29) is installed inside the limiting block (213). A sliding sleeve (210) is threadedly connected to the inside of the threaded column (29). A connecting rod (211) is installed on the outside of the sliding sleeve (210). The connecting rod (211) is slidably connected inside the fixed column (21). A protective sleeve (212) is installed on the outside of the connecting rod (211). The protective sleeve (212) is provided on the surface of the exhaust channel.
2. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The fixed column (21) is slidably connected to a sliding column (22), which is installed on the surface of the docking sealing mechanism (13). A fixed rod (23) is installed inside the sliding column (22), and a rotating column (24) is slidably connected to the surface of the fixed rod (23). The rotating column (24) is rotatably connected to the inner side of the sliding column (22), and the rotating column (24) is installed on the connecting column (25). An arc-shaped sliding groove (240) is opened on the surface of the rotating column (24), and the cross section of the connecting rod (211) is cross-shaped.
3. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The fixed column (21) has an annular groove 1 (2100) inside, and a strip groove (2101) and an annular groove 2 (2102) inside, which are connected to each other.
4. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The adjusting component (3) includes a fixing ring (31) which is installed on the inner wall of the protective sleeve (212). A locking block (32) is installed on the inner side of the fixing ring (31). A sealing block (33) is slidably connected inside the locking block (32). An adjusting spring (34) is installed on the outer side of the sealing block (33). The adjusting spring (34) is installed on the inner wall of the locking block (32).
5. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The exhaust channel assembly (12) includes two sets of independent exhaust channels arranged symmetrically on the left and right. The axes of the two sets of independent exhaust channels are parallel to the center line of the symmetry of the enclosed soundproof chamber (11), and the air inlet end of each set of independent exhaust channels extends to the side wall opening of the enclosed soundproof chamber (11). The exhaust end is sealed and connected to the exhaust assembly (15) through a manifold.
6. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The functional module component (14) is connected in series in the middle section of the independent exhaust channel, including a muffler module (141) and a particulate filter module (142) connected in parallel. The damper switching mechanism (16) is an electric three-way reversing valve. Its input end is connected to the independent exhaust channel, and its output end is sealed and connected to the input ends of the muffler module (141) and the particulate filter module (142) respectively. The output ends of the muffler module (141) and the particulate filter module (142) are connected to the manifold.
7. The dual-station enclosed railway locomotive testing exhaust equipment according to claim 1, characterized in that: The exhaust assembly (15) includes a shared centrifugal induced draft fan (151) and a main exhaust system (152). The input end of the centrifugal induced draft fan (151) is sealed to the manifold, and the output end is fixedly connected to the main exhaust system (152). The end of the main exhaust system (152) extends to the outside of the enclosed soundproof chamber (11) and is bent upward.