A piston air duct structure and ventilation and air-conditioning system for an underground rail transit station

Abstract

The present application relates to a piston air duct structure of a rail transit underground station and its ventilation and air conditioning system, which includes: a first piston air duct, a second piston air duct and a structural mid-plate, wherein the first piston air duct is located above the second piston air duct, and the first piston air duct and the second piston air duct are separated by a sandwich plate; the structural mid-plate is arranged at the bottom end of the second piston air duct, and the bottom end of the structural mid-plate is used to be flush with the bottom end of the bottom plate of the track top air duct. The present invention partially sinks the structural mid-plate to be flush with the bottom end of the bottom plate of the track top air duct, and increases the floor height of the station hall at the piston air duct without encroaching on the limit of the track area; using the increased floor height, the conventional horizontal parallel arrangement of the double piston air ducts is changed to the first piston air duct and the second piston air duct being stacked up and down. At this time, although the width of the first piston air duct and the second piston air duct is increased, the overall width of the piston air duct is reduced, thereby shortening the length of the station body.

Description

Technical Field

[0001] The present application relates to the field of rail transit station structure and ventilation and air conditioning, and in particular to a piston air duct structure of a rail transit underground station and a ventilation and air conditioning system thereof. Background Art

[0002] The length of the main structure of an underground rail transit station is generally controlled by the size of the equipment area at the concourse level. The more compact and rational the equipment area layout, the shorter the main structure of the station, and the lower the construction costs. Piston air ducts are large in scale and occupy a significant proportion of the total station floor area. For example, a conventional standard two-story underground station with 6B train formations has a main structure length of approximately 210 meters. The width of the twin piston air ducts at one end of the station is approximately 14 to 16 meters. The total width of the piston air ducts accounts for approximately one-seventh of the total station length, significantly impacting the overall station size.

[0003] Conventional double-piston air ducts are arranged horizontally in parallel, and some corner spaces and local vertical spaces cannot be fully utilized. This is inevitable. Excellent designers can minimize space waste by optimizing the layout, but it cannot be completely eliminated.

[0004] Furthermore, in typical underground stations, after exhaust air from the platform-level track-top duct enters the exhaust duct, the track-top duct terminates below the exhaust duct. Therefore, a track-top duct is not necessary on the platform level below the piston duct. The track-top duct typically has a clear height of 1.2m and a plate thickness of 0.2m. Approximately 1.4m of platform height below the piston duct remains unused, resulting in waste. Summary of the Invention

[0005] The present application provides a piston air duct structure for an underground rail transit station and a ventilation and air-conditioning system thereof, which can solve the space waste problem existing in double-piston air duct stations in the related art.

[0006] In a first aspect, an embodiment of the present application provides a piston air duct structure of a rail transit underground station, comprising: a first piston air duct, a second piston air duct and a structural mid-plate, wherein the first piston air duct is located above the second piston air duct, and the first piston air duct and the second piston air duct are separated by a sandwich plate; the structural mid-plate is arranged at the bottom end of the second piston air duct, and the bottom end of the structural mid-plate is used to be flush with the bottom end of the bottom plate of the rail top air duct.

[0007] In combination with the first aspect, in one embodiment, the sandwich panel has a stepped structure.

[0008] In combination with the first aspect, in one embodiment, a first internal muffler installation space, a first external muffler installation space and a first air duct are provided between the top end of the sandwich plate and the first piston air duct.

[0009] In combination with the first aspect, in one embodiment, the height of the first built-in muffler installation space is greater than the height of the first external muffler installation space;

[0010] The height of the first external muffler installation space is greater than the height of the first air duct.

[0011] In combination with the first aspect, in one embodiment, the bottom end of the first built-in muffler installation space is located below the bottom end of the first external muffler installation space;

[0012] The bottom end of the first external muffler installation space is located below the bottom end of the first air duct.

[0013] In combination with the first aspect, in one embodiment, a second internal muffler installation space, a second external muffler installation space and a second air duct are provided between the bottom end of the sandwich plate and the second piston air duct.

[0014] In combination with the first aspect, in one embodiment, the height of the second internal muffler installation space is less than the height of the second external muffler installation space;

[0015] The height of the second air duct is smaller than the height of the second built-in muffler installation space.

[0016] In combination with the first aspect, in one embodiment, the top of the second internal muffler installation space is located below the top of the second external muffler installation space;

[0017] The top of the second air duct is located below the top of the second built-in muffler installation space.

[0018] In combination with the first aspect, in one embodiment, the second built-in muffler installation space is located below the first external muffler installation space.

[0019] In a second aspect, an embodiment of the present application provides a ventilation and air-conditioning system, characterized in that it includes: the piston air duct structure as described above; wherein, the first piston air duct and the second piston air duct are both provided with a built-in silencer and an external silencer.

[0020] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0021] An embodiment of the present application provides a piston air duct structure and a ventilation and air-conditioning system for an underground rail transit station, in which the middle plate of the structure is moved downward to be flush with the bottom end of the bottom plate of the track-top air duct, thereby increasing the floor height of the station hall at the piston air duct without encroaching on the limit of the track area; utilizing the increased floor height, the conventional horizontal parallel arrangement of the double piston air ducts is changed to the first piston air duct and the second piston air duct being stacked up and down. At this time, although the widths of the first piston air duct and the second piston air duct are increased, since the first piston air duct and the second piston air duct are stacked up and down, the overall width of the piston air duct is reduced, thereby shortening the main length of the station. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A conventional cross-sectional view of a dual-piston air duct provided in an embodiment of the present application;

[0024] Figure 2 A cross-sectional view of the first piston air duct and the second piston air duct provided in an embodiment of the present application (first perspective);

[0025] Figure 3 A cross-sectional view of the first piston air duct and the second piston air duct provided in an embodiment of the present application (second perspective);

[0026] Figure 4 A plan view of the first piston air duct provided in an embodiment of the present application;

[0027] Figure 5 A plan view of the second piston air duct provided in an embodiment of the present application.

[0028] In the figure: 1. First piston air duct; 10. First built-in silencer installation space; 11. First external silencer installation space; 12. First air duct; 13. First piston air valve; 14. First mechanical air valve; 2. Second piston air duct; 20. Second built-in silencer installation space; 21. Second external silencer installation space; 22. Second air duct; 23. Second piston air valve; 24. Second mechanical air valve; 3. Rail top air duct; 4. Structural middle plate; 5. Optimized space; 6. Built-in silencer; 7. External silencer; 8. Sandwich panel; 9. Original structure middle plate setting position. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] See also Figures 2 to 5 The embodiment of the present application provides a piston air duct structure and ventilation and air-conditioning system for an underground rail transit station, which can solve the space waste problem existing in the double-piston air duct station in the related art.

[0031] The piston air duct is divided into three sections: the damper, the fan and muffler, and the duct. Each section has different space requirements. The damper section, where airflow is obstructed through the valve body, generally requires a larger damper to ensure effective ventilation, requiring more space. The fan and muffler section only requires space for the piston air after the equipment is installed, requiring less space. The duct section, devoid of any equipment, requires only a net airflow area of ​​16 square meters, minimizing space requirements. The width of the piston airflow is primarily controlled by a pair of side-by-side piston dampers and mechanical dampers. The piston dampers typically measure 5 x 4 meters (width x height), providing a net airflow area of ​​approximately 16 square meters. The mechanical dampers typically measure 3 x 4 meters (width x height). Considering space for equipment installation and maintenance, a piston duct width of approximately 9-10 meters is achieved. A 5-meter width is typically sufficient for the piston duct outside the dampers, but this space is wasted within the duct. Because this space is within the duct, it often lacks connectivity to the equipment area, hindering effective utilization.

[0032] In response to the space waste in double-piston air duct stations, on the first hand, an embodiment of the present application provides a piston air duct structure for a rail transit underground station, which includes: a first piston air duct 1, a second piston air duct 2 and a structural mid-plate 4, wherein the first piston air duct 1 is located above the second piston air duct 2, and the first piston air duct 1 and the second piston air duct 2 are separated by a sandwich plate 8; the structural mid-plate 4 is arranged at the bottom end of the second piston air duct 2, and the bottom end of the structural mid-plate 4 is used to be flush with the bottom end of the bottom plate of the rail top air duct 3.

[0033] In this application, the structural middle plate 4 is partially sunken and flush with the bottom end of the bottom plate of the track top air duct 3. Under the premise of not encroaching on the limit of the track area, the station hall floor height at the piston air duct is increased; using the increased floor height, Figure 1 The conventional double piston air duct horizontal parallel arrangement shown is changed to Figure 2As shown, the first piston air duct 1 and the second piston air duct 2 are stacked up and down. At this time, although the width of the first piston air duct 1 and the second piston air duct 2 is increased, the overall width of the piston air duct is reduced because the first piston air duct 1 and the second piston air duct 2 are stacked up and down, thereby shortening the main length of the station.

[0034] like Figure 2 As shown, the original structural middle plate setting position 9 is set above the bottom end of the track top air duct 3, so that the space between the bottom end of the original structural middle plate setting position 9 and the bottom end of the track top air duct 3 is wasted. After the structural middle plate 4 is moved down from the original structural middle plate setting position 9 to be flush with the bottom end of the bottom plate of the track top air duct 3, the first piston air duct 1 and the second piston air duct 2 can be stacked up and down; using the space from the bottom end of the bottom plate of the platform level track top air duct 3 to the bottom of the structural middle plate 4, the structural middle plate 4 at the piston air duct is partially sunken, and the bottom of the structural middle plate 4 is flush with the elevation of the bottom of the track top air duct 3. Under the premise of not encroaching on the limit of the track area, the station hall floor height at the piston air duct is increased. And when the original double piston air ducts were arranged horizontally and side by side, the overall required width was larger in order to meet the ventilation requirements of each piston air duct. After the first piston air duct 1 and the second piston air duct 2 are stacked up and down, the overall width of the piston air duct can be saved. At this time, the structural side wall at the piston air duct can be moved toward the inside of the piston air duct to reduce the overall width of the piston air duct. Figure 4 As shown, after the structural side wall at the piston air duct moves, an optimized space 5 is reserved, and the optimized space 5 is the saved space.

[0035] Based on the above embodiment, in this embodiment, see Figure 3 As shown, the sandwich plate 8 is a stepped structure.

[0036] Specifically, according to the different space requirements at different positions of the piston air duct, the sandwich plate 8 is set to a three-step shape to meet the requirements of different equipment heights.

[0037] Among them, there are a first internal muffler installation space 10, a first external muffler installation space 11 and a first air duct 12 between the top end of the sandwich plate 8 and the first piston air duct 1.

[0038] like Figure 3 As shown, the sandwich panel 8 is arranged in a three-step configuration so that the height of the first internal muffler installation space 10 is greater than the height of the first external muffler installation space 11; and the height of the first external muffler installation space 11 is greater than the height of the first air duct 12. It should be noted that the height here refers to the distance between the top of the sandwich panel 8 and the top of the inner wall of the first piston air duct 1.

[0039] At this time, the bottom end of the first internal muffler installation space 10 is located below the bottom end of the first external muffler installation space 11 ; the bottom end of the first external muffler installation space 11 is located below the bottom end of the first air duct 12 .

[0040] The first internal muffler installation space 10 is used to install the internal muffler 6, the first piston air valve 13 and the first mechanical air valve 14; the first external muffler installation space 11 is used to install the external muffler 7. Figure 4 As shown, the first mechanical air valve 14 is arranged on one side of the built-in muffler 6 inside the first built-in muffler installation space 10, and a first piston air valve 13 is arranged at one end of the first mechanical air valve 14.

[0041] On the basis of the above embodiment, in this embodiment, a second internal muffler installation space 20 , a second external muffler installation space 21 and a second air duct 22 are provided between the bottom end of the sandwich plate 8 and the second piston air duct 2 .

[0042] Specifically, such as Figure 3 As shown, because the sandwich panel 8 is arranged in a three-stepped shape, the height of the second internal muffler installation space 20 is smaller than the height of the second external muffler installation space 21; the height of the second air duct 22 is smaller than the height of the second internal muffler installation space 20. It should be noted that the height here refers to the distance between the top of the inner wall of the second piston air duct 2 and the bottom of the sandwich panel 8.

[0043] At this time, the top of the second built-in muffler installation space 20 is located below the top of the second external muffler installation space 21 ; the top of the second air duct 22 is located below the top of the second built-in muffler installation space 20 .

[0044] The second external muffler installation space 21 is used to install the external muffler 7, the second piston air valve 23 and the second mechanical air valve 24; the second internal muffler installation space 20 is used to install the internal muffler 6. Figure 5 As shown, the second mechanical air valve 24 is arranged on one side of the external muffler 7 inside the second external muffler installation space 21, and a second piston air valve 23 is arranged at one end of the second mechanical air valve 24.

[0045] Furthermore, the second built-in silencer installation space 20 is located below the first external silencer installation space 11, and the first piston air valve 13 and the first mechanical air valve 14 inside the first piston air duct 1 and the second piston air valve 23 and the second mechanical air valve 24 inside the second piston air duct 2 are staggered.

[0046] For example, a two-story underground island platform station with a 6B train set and AC overhead line power supply has a platform width of 12m, a standard section width of 20.9m, a 5.4m clearance in the concourse public area, a 5.5m clearance at the piston air duct, and a 3m cover. Structural center plate 4 of the piston air duct is sunk 1.4m, resulting in a 6.9m clearance at the concourse level and a 4.5m distance from the platform track surface to the bottom of structural center plate 4, meeting the running clearance requirements.

[0047] The clearances of the first internal muffler installation space 10, the first external muffler installation space 11 and the first air duct 12 of the first piston air duct 1 are 4.35m, 3.3m and 2.3m respectively;

[0048] The clearances of the second built-in muffler installation space 20, the second external muffler installation space 21 and the second air duct 22 of the second piston air duct 2 are 3.3m, 4.35m and 2.3m respectively.

[0049] In this embodiment, the built-in silencer 6 inside the first built-in silencer installation space 10 is adjusted to 3×4m (width×height), and the external silencer 7 inside the first external silencer installation space 11 is adjusted to 4×3m (width×height). The first mechanical air valve 14 is set on the side of the built-in silencer 6 inside the first built-in silencer installation space 10, and the size of the first mechanical air valve 14 is set to 3×4m (width×height), and the size of the first piston air valve 13 is set to 5×4m (width×height). A 0.3m installation and maintenance space is set between the first mechanical air valve 14 and the first piston air valve 13 and the side wall of the first piston air duct 1, and a 0.4m gap is set between the first mechanical air valve 14 and the first piston air valve 13. Therefore, it is recommended that the width of the first piston air duct 1 be 9m wide to meet the requirements.

[0050] The built-in silencer 6 inside the second built-in silencer installation space 20 is adjusted to 4×3m (width×height), and the external silencer 7 inside the second external silencer installation space 21 is adjusted to 3×4m (width×height). The second mechanical air valve 24 is set on the side of the external silencer 7 inside the second external silencer installation space 21, and the size of the second mechanical air valve 24 is set to 3×4m (width×height), and the size of the second piston air valve 23 is set to 5×4m (width×height). A 0.3m installation and maintenance space is set between the second mechanical air valve 24 and the second piston air valve 23 and the side wall of the second piston air duct 2, and a 0.4m gap is set between the second mechanical air valve 24 and the second piston air valve 23. Therefore, it is recommended that the width of the second piston air duct 2 be 9m wide to meet the requirements.

[0051] In a second aspect, an embodiment of the present application provides a ventilation and air-conditioning system, comprising:

[0052] The piston air duct structure provided in any of the above embodiments of the present application; wherein, a built-in muffler 6 and an external muffler 7 are provided inside the first piston air duct 1 and the second piston air duct 2.

[0053] In the present application, the structural mid-plate 4 is partially sunken and flush with the bottom end of the bottom plate of the track top air duct 3, thereby increasing the floor height of the station hall at the piston air duct without encroaching on the limit of the track area; utilizing the increased floor height, the conventional horizontal parallel arrangement of the double piston air ducts is changed to the first piston air duct 1 and the second piston air duct 2 being stacked up and down. At this time, although the width of the first piston air duct 1 and the second piston air duct 2 is increased, the overall width of the piston air duct is reduced due to the stacking of the first piston air duct 1 and the second piston air duct 2, thereby shortening the main length of the station.

[0054] According to the different space requirements at different positions of the piston air duct, the sandwich plate 8 is set to a three-step shape to meet the requirements of different equipment heights.

[0055] Among them, there are a first internal muffler installation space 10, a first external muffler installation space 11 and a first air duct 12 between the top end of the sandwich plate 8 and the first piston air duct 1.

[0056] like Figure 3 As shown, the sandwich panel 8 is arranged in a three-step configuration so that the height of the first internal muffler installation space 10 is greater than the height of the first external muffler installation space 11; and the height of the first external muffler installation space 11 is greater than the height of the first air duct 12. It should be noted that the height here refers to the distance between the top of the sandwich panel 8 and the top of the inner wall of the first piston air duct 1.

[0057] At this time, the bottom end of the first internal muffler installation space 10 is located below the bottom end of the first external muffler installation space 11 ; the bottom end of the first external muffler installation space 11 is located below the bottom end of the first air duct 12 .

[0058] The first internal muffler installation space 10 is used to install the internal muffler 6, the first piston air valve 13 and the first mechanical air valve 14; the first external muffler installation space 11 is used to install the external muffler 7. Figure 4 As shown, the first mechanical air valve 14 is arranged on one side of the built-in muffler 6 inside the first built-in muffler installation space 10, and a first piston air valve 13 is arranged at one end of the first mechanical air valve 14.

[0059] On the basis of the above embodiment, in this embodiment, a second internal muffler installation space 20 , a second external muffler installation space 21 and a second air duct 22 are provided between the bottom end of the sandwich plate 8 and the second piston air duct 2 .

[0060] Specifically, such as Figure 3As shown, because the sandwich panel 8 is arranged in a three-stepped shape, the height of the second internal muffler installation space 20 is smaller than the height of the second external muffler installation space 21; the height of the second air duct 22 is smaller than the height of the second internal muffler installation space 20. It should be noted that the height here refers to the distance between the top of the inner wall of the second piston air duct 2 and the bottom of the sandwich panel 8.

[0061] At this time, the top of the second built-in muffler installation space 20 is located below the top of the second external muffler installation space 21 ; the top of the second air duct 22 is located below the top of the second built-in muffler installation space 20 .

[0062] The second external muffler installation space 21 is used to install the external muffler 7, the second piston air valve 23 and the second mechanical air valve 24; the second internal muffler installation space 20 is used to install the internal muffler 6. Figure 5 As shown, the second mechanical air valve 24 is arranged on one side of the external muffler 7 inside the second external muffler installation space 21, and a second piston air valve 23 is arranged at one end of the second mechanical air valve 24.

[0063] Furthermore, the second built-in silencer installation space 20 is located below the first external silencer installation space 11, and the first piston air valve 13 and the first mechanical air valve 14 inside the first piston air duct 1 and the second piston air valve 23 and the second mechanical air valve 24 inside the second piston air duct 2 are staggered.

[0064] For example, a two-story underground island platform station with a 6B train set and AC overhead line power supply has a platform width of 12m, a standard section width of 20.9m, a 5.4m clearance in the concourse public area, a 5.5m clearance at the piston air duct, and a 3m cover. Structural center plate 4 of the piston air duct is sunk 1.4m, resulting in a 6.9m clearance at the concourse level and a 4.5m distance from the platform track surface to the bottom of structural center plate 4, meeting the running clearance requirements.

[0065] The clearances of the first internal muffler installation space 10, the first external muffler installation space 11 and the first air duct 12 of the first piston air duct 1 are 4.35m, 3.3m and 2.3m respectively;

[0066] The clearances of the second built-in muffler installation space 20, the second external muffler installation space 21 and the second air duct 22 of the second piston air duct 2 are 3.3m, 4.35m and 2.3m respectively.

[0067] In this embodiment, the built-in silencer 6 inside the first built-in silencer installation space 10 is adjusted to 3×4m (width×height), and the external silencer 7 inside the first external silencer installation space 11 is adjusted to 4×3m (width×height). The first mechanical air valve 14 is set on the side of the built-in silencer 6 inside the first built-in silencer installation space 10, and the size of the first mechanical air valve 14 is set to 3×4m (width×height), and the size of the first piston air valve 13 is set to 5×4m (width×height). A 0.3m installation and maintenance space is set between the first mechanical air valve 14 and the first piston air valve 13 and the side wall of the first piston air duct 1, and a 0.4m gap is set between the first mechanical air valve 14 and the first piston air valve 13. Therefore, it is recommended that the width of the first piston air duct 1 be 9m wide to meet the requirements.

[0068] The built-in silencer 6 inside the second built-in silencer installation space 20 is adjusted to 4×3m (width×height), and the external silencer 7 inside the second external silencer installation space 21 is adjusted to 3×4m (width×height). The second mechanical air valve 24 is set on the side of the external silencer 7 inside the second external silencer installation space 21, and the size of the second mechanical air valve 24 is set to 3×4m (width×height), and the size of the second piston air valve 23 is set to 5×4m (width×height). A 0.3m installation and maintenance space is set between the second mechanical air valve 24 and the second piston air valve 23 and the side wall of the second piston air duct 2, and a 0.4m gap is set between the second mechanical air valve 24 and the second piston air valve 23. Therefore, it is recommended that the width of the second piston air duct 2 be 9m wide to meet the requirements.

[0069] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0070] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0071] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A piston air duct structure for an underground rail transit station, characterized in that: It includes: First piston air duct (1); a second piston air duct (2), wherein the first piston air duct (1) is located above the second piston air duct (2), and the first piston air duct (1) and the second piston air duct (2) are separated by a sandwich plate (8); A structural middle plate (4), wherein the structural middle plate (4) is arranged at the bottom end of the second piston air duct (2), and the bottom end of the structural middle plate (4) is used to be flush with the bottom end of the bottom plate of the rail top air duct (3); The sandwich plate (8) has a stepped structure; A first internal muffler installation space (10), a first external muffler installation space (11) and a first air duct (12) are provided between the top end of the sandwich plate (8) and the first piston air duct (1); The height of the first built-in muffler installation space (10) is greater than the height of the first external muffler installation space (11); The height of the first external muffler installation space (11) is greater than the height of the first air duct (12); A second internal muffler installation space (20), a second external muffler installation space (21) and a second air duct (22) are provided between the bottom end of the sandwich plate (8) and the second piston air duct (2); The height of the second built-in muffler installation space (20) is smaller than the height of the second external muffler installation space (21); The height of the second air duct (22) is less than the height of the second built-in muffler installation space (20); The second internal muffler installation space (20) is located below the first external muffler installation space (11).

2. The piston air duct structure for an underground rail transit station according to claim 1, characterized in that: The bottom end of the first built-in muffler installation space (10) is located below the bottom end of the first external muffler installation space (11); The bottom end of the first external muffler installation space (11) is located below the bottom end of the first air duct (12).

3. The piston air duct structure for an underground rail transit station according to claim 1, characterized in that: The top of the second internal muffler installation space (20) is located below the top of the second external muffler installation space (21); The top end of the second air duct (22) is located below the top end of the second built-in muffler installation space (20).

4. A ventilation and air conditioning system, characterized in that: It includes: The piston air duct structure according to any one of claims 1 to 3; Wherein, a built-in silencer (6) and an external silencer (7) are both provided inside the first piston air duct (1) and the second piston air duct (2).

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