Air duct system of a vehicle and city sightseeing vehicle using the same

Abstract

This invention discloses a vehicle air duct system and its application in urban sightseeing vehicles. An air conditioning unit is installed at the outer end of the vehicle body, located between the passenger compartment and the connecting air duct module. The passenger compartment air duct module includes an air supply duct, which comprises a front arm air duct unit and a rear arm air duct unit located between the vehicle body top frame and the top interior trim, at both ends of the passenger compartment. The left and right sides of the front arm air duct unit and the rear arm air duct unit are connected by a middle arm air duct unit. The front arm air duct unit and the rear arm air duct unit are each provided with a lateral air outlet for supplying air into the passenger compartment. This invention improves the standing comfort of vehicle passengers, enhances the passenger experience under current limited space conditions, significantly reduces vehicle failure rate, and saves maintenance costs. Furthermore, the air duct scheme proposed in this invention allows for a large central area to be reserved in the vehicle body top trim, thereby diversifying the interior use of the passenger compartment and meeting various needs.

Description

Technical Field

[0001] This invention belongs to the field of vehicle air ducts, specifically relating to a vehicle air duct system, and also to an urban tourist sightseeing vehicle using this air duct system. Background Technology

[0002] In existing technologies, to facilitate installation and maintenance, the air conditioning units for urban tourist sightseeing vehicles are generally mounted on the roof. As a result, the height of the air conditioning units and air ducts occupies a significant amount of vertical space inside the vehicle's passenger compartment. Due to existing line clearance limitations, the roof cannot be raised, which in turn affects the standing comfort of the passengers. Furthermore, in existing technologies, the air from the bottom of the air conditioning unit enters the air duct and then passes through the air outlet grille before finally entering the interior. When problems occur inside the air conditioning unit or between the air conditioning unit and the vehicle body, condensate or rainwater located at the top of the vehicle body frequently enters the passenger compartment, making maintenance inconvenient and resulting in a high failure rate.

[0003] The applicant conducted further technical searches and found that even with the improved technologies proposed in the urban sightseeing vehicle air duct schemes, such as CN203047271U, CN207510186U, and CN109968946A, the air conditioning units still adopt the roof-mounted installation scheme, and therefore the aforementioned technical problems still exist.

[0004] Therefore, based on the inventor's many years of research and development experience and accumulated theoretical knowledge in this field, this application seeks to find a technical solution to solve the above technical problems. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a vehicle air duct system and its application in urban tourist sightseeing vehicles, which does not occupy much vertical space in the vehicle's passenger compartment, improves the standing comfort of vehicle passengers under existing limited space conditions, and the condensate generated by the air conditioning unit is directly discharged from the external end, while rainwater will not enter the vehicle body, thus improving the passenger riding experience, significantly reducing the vehicle's failure rate, and saving maintenance costs; in addition, the air duct scheme proposed in this invention allows for the reservation of a large central area in the roof decoration, which can meet the needs of installing large areas of transparent glass or multi-shaped and multi-functional LED colored lights on the roof, thereby diversifying the interior use of the passenger compartment and meeting various needs.

[0006] The technical solution adopted in this invention is as follows:

[0007] A vehicle air duct system is disclosed, the vehicle comprising a body with a passenger compartment and a driver's compartment respectively separated, the passenger compartment having a passenger compartment air duct module, and the driver's compartment having a driver's compartment air duct module, the passenger compartment air duct module being connected to the driver's compartment air duct module via a transfer air duct module; wherein an air conditioning unit is provided at the outer end of the vehicle body located between the passenger compartment and the transfer air duct module, the passenger compartment air duct module including an air supply duct, the air supply duct including a front arm air duct unit and a rear arm air duct unit located between the top frame of the vehicle body and the top interior trim and at both ends of the passenger compartment, the left and right sides of the front arm air duct unit and the rear arm air duct unit being connected via a middle arm air duct unit, and the front arm air duct unit and the rear arm air duct unit each having a lateral air outlet for supplying air to the interior of the passenger compartment.

[0008] Preferably, the forearm air duct unit includes a forearm main air duct that connects to the intermediate arm air duct unit and the transition air duct module respectively. The bottom of the forearm main air duct is provided with a forearm lateral air outlet, and the forearm main air duct located on the outer periphery of the forearm lateral air outlet is provided with forearm soft elastic cotton. And / or, the rear arm air duct unit includes a rear arm main air duct. The bottom of the rear arm main air duct is provided with a rear arm lateral air outlet, and the rear arm main air duct located on the outer periphery of the rear arm lateral air outlet is provided with rear arm soft elastic cotton.

[0009] Preferably, the top interior is provided with a flow guide grille located below the soft elastic cotton of the forearm or the soft elastic cotton of the rear arm. The flow guide grille and its corresponding soft elastic cotton are installed in a compressed manner to ensure the air delivery rate of the corresponding horizontal air outlet.

[0010] Preferably, the outer end of the main air duct of the forearm extends downward along the end wall profile of the vehicle body to the air inlet, and the air inlet is connected to the air outlet of the air conditioning unit; a return air duct is provided inside the end wall profile of the vehicle body located below the air inlet, and the return air duct is provided with an indoor return air inlet connected to the interior of the passenger compartment and a return air outlet connected to the air conditioning unit.

[0011] Preferably, the forearm main air duct is provided with a middle guide plate and / or a bottom arm guide plate and / or a reverse guide plate and / or a front guide plate. The middle guide plate is arc-shaped and connected to the middle of the air inlet for air diversion. The bottom arm guide plate is arc-shaped and connected to the bottom of the air inlet for reducing local air resistance. The reverse guide plate is arc-shaped and connected to the transition air duct module for reverse airflow guidance. The front guide plate is bent and located at the front end of the forearm main air duct for airflow guidance.

[0012] Preferably, the interior of the rear arm main air duct is provided with an intermediate diversion plate and / or an intermediate partition plate to divide the interior space of the rear arm main air duct.

[0013] Preferably, the forearm lateral air outlet adopts a forearm lateral perforated plate with a number of small holes evenly distributed, and the rear arm lateral air outlet adopts a rear arm lateral perforated plate with a number of small holes evenly distributed, and the diameter of the small holes in the forearm lateral perforated plate is smaller than the diameter of the small holes in the rear arm lateral perforated plate, and the occupancy ratio of the small holes in the rear arm lateral perforated plate is greater than the occupancy ratio of the small holes in the forearm lateral perforated plate.

[0014] Preferably, the air inlet has a protrusion on its outer periphery, and the air outlet has a U-shaped waterproof baffle on its side. A sealing strip is embedded inside the waterproof baffle, and the sealing strip and the protrusion are squeezed together to form a sealed and waterproof structure.

[0015] Preferably, the cab air duct module includes a cab top air duct, a driver's cab leg air duct, and a transition air duct, all located on the top of the cab. The cab top air duct is connected to the transition air duct module via the transition air duct, wherein the transition air duct module is located on the top of the equipment compartment. The cab top air duct has at least one air outlet grille installed at its bottom, and cab air outlets are symmetrically arranged on its left and right sides. The cab air outlets are connected to the driver's cab leg air duct, which delivers airflow to the driver's leg area, thereby improving the comfort of that area.

[0016] Preferably, the air conditioning unit is a vertically mounted air conditioning unit, with vertical vibration dampers fixedly installed symmetrically on the left and right sides of its bottom, and longitudinal vibration dampers fixedly installed symmetrically on the left and right sides of its top. At the same time, secondary anti-detachment ropes are symmetrically connected to the end wall profile of the vehicle body on the left and right sides of its top, which are used to reduce vibration and prevent detachment of the vertically mounted air conditioning unit.

[0017] Preferably, an urban sightseeing vehicle employs the air duct system described above.

[0018] This application proposes a vehicle air duct system structure consisting of a passenger compartment air duct module, a transfer air duct module, and a driver's cab air duct module. Specifically, an air conditioning unit is installed at the exterior end of the vehicle body, located between the passenger compartment and the transfer air duct module. During operation, the air conditioning unit delivers air to the passenger compartment air duct module via side ventilation. The air outlets of the passenger compartment air duct module are horizontal (i.e., airflow is directed across the width of the passenger compartment), ensuring that the air duct system does not occupy excessive vertical space within the vehicle's passenger compartment. Under existing space constraints, this improves the standing comfort of vehicle passengers (especially tourists in urban sightseeing vehicles). Furthermore, condensate generated by the air conditioning unit is directly discharged from the exterior end, preventing rainwater from entering the vehicle body, thus improving the passenger experience, significantly reducing vehicle failure rates, and saving maintenance costs. In addition, the proposed air duct scheme allows for a large central area to be reserved on the vehicle's roof, accommodating the installation of large transparent glass or multi-functional LED lights, thereby diversifying the interior use of the passenger compartment and meeting various needs. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the vehicle's air duct system along the length of the vehicle body according to a specific embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A magnified view of the local structure;

[0021] Figure 3 yes Figure 2 Sectional view along the AA direction;

[0022] Figure 4 yes Figure 2 A magnified view of the local structure;

[0023] Figure 5 This is a top view of the vehicle's air duct system along the length of the vehicle body according to a specific embodiment of the present invention;

[0024] Figure 6 yes Figure 5 A magnified view of a portion of the structure;

[0025] Figure 7 yes Figure 6 Enlarged view of the structure at point A or A';

[0026] Figure 8 yes Figure 5 Another enlarged view of the local structure;

[0027] Figure 9 This is a schematic diagram of the air supply surface structure of the vertically installed air conditioning unit 5 according to a specific embodiment of the present invention. Detailed Implementation

[0028] This embodiment discloses a vehicle air duct system. The vehicle includes a body that is divided into a passenger compartment and a driver's compartment. The passenger compartment is provided with a passenger compartment air duct module, and the driver's compartment is provided with a driver's compartment air duct module. The passenger compartment air duct module is connected to the driver's compartment air duct module through a transfer air duct module. An air conditioning unit is provided at the outer end of the vehicle body between the passenger compartment and the transfer air duct module. The passenger compartment air duct module includes an air supply duct. The air supply duct includes a front arm air duct unit and a rear arm air duct unit located between the top frame of the vehicle body and the top interior trim and at both ends of the passenger compartment. The left and right sides of the front arm air duct unit and the rear arm air duct unit are connected through a middle arm air duct unit. At the same time, the front arm air duct unit and the rear arm air duct unit are each provided with a lateral air outlet for supplying air to the passenger compartment.

[0029] The embodiments of this invention disclose technical solutions that, in order to enable those skilled in the art to better understand the technical solutions of this invention, will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0030] Please see Figure 1 and Figure 5 As shown, a vehicle air duct system is described, specifically for an urban sightseeing vehicle. The vehicle includes a body 1 with a passenger compartment 1a and a driver's cab 1b separated from each other. The passenger compartment 1a has a passenger compartment air duct module 2, and the driver's cab 1b has a driver's cab air duct module 3. The passenger compartment air duct module 2 is connected to the driver's cab air duct module 3 via a connecting air duct module 4. An air conditioning unit 5 is installed at the outer end of the vehicle body (also commonly referred to as the "two ends of the vehicle body") between the passenger compartment 1a and the connecting air duct module 4. Please refer to [further details omitted]. Figure 6 As shown, preferably, in this embodiment, the air conditioning unit 5 is a vertically mounted air conditioning unit located below the transfer duct module 4. Vertical vibration dampers 51 are symmetrically fixed at its bottom, and longitudinal vibration dampers 52 are symmetrically fixed at its top. Simultaneously, secondary anti-detachment ropes 57 are symmetrically connected to the two end wall profiles 1c of the vehicle body at its top, used for vibration damping and anti-detachment of the vertically mounted air conditioning unit 5. Preferably, in this embodiment, the transfer duct module 4 is a highly flexible structure with telescopic, vertical, horizontal, and torsional functions, facilitating vehicle swaying during driving. Specifically, it can be made of locally flexible materials with water-proof and heat-insulating functions. To facilitate installation, during actual installation, it is specifically connected to the duct module via a flange structure.

[0031] Preferably, in this embodiment, in order to facilitate installation and subsequent maintenance, the passenger compartment air duct module 2, the driver's cab air duct module 3, and the transfer air duct module 4 can all be installed and disassembled for maintenance independently.

[0032] More preferably, to facilitate installation, in this embodiment, the passenger compartment air duct module 2, the driver's cab air duct module 3, and the transfer air duct module 4 are fixed to the vehicle body 1 by brackets and bolts. In specific implementation, the passenger compartment air duct module 2 can supply air to a single passenger compartment independently, or it can be combined with the driver's cab air duct module 3 for air supply. These are all within the scope of this application, and this embodiment does not impose any special limitations on them. In addition, the lateral and longitudinal dimensions of the passenger compartment air duct module 2 can be adjusted according to actual needs to meet actual application requirements, and this embodiment does not impose any special limitations on them.

[0033] In this embodiment, please refer to the following further details. Figure 6 , Figure 7 As shown, the passenger compartment air duct module 2 includes an air supply duct connected to the vertically mounted air conditioning unit 5. The air supply duct includes a front arm air duct unit 21 and a rear arm air duct unit 22 located between the top frame of the vehicle body and the top interior trim 1d and at both ends of the passenger compartment 1a. The left and right sides of the front arm air duct unit 21 and the rear arm air duct unit 22 are connected through a middle arm air duct unit 23, respectively. At the same time, the front arm air duct unit 21 and the rear arm air duct unit 22 are respectively provided with transverse air outlets for supplying air into the passenger compartment 1a. Specifically, preferably, in this embodiment, the middle arm air duct 23 adopts a rectangular pipe with a uniform cross-section and an inner cross-section size of 150*60mm. The overall length L2, width W2, and height H2 of the air supply duct are 4398*1220*350mm.

[0034] Preferably, please see further details. Figure 2 , Figure 3As shown, in this embodiment, the forearm air duct unit 21 includes a forearm main air duct 21a that connects to the intermediate arm air duct unit 23 and the transfer air duct module 4 respectively. The bottom of the forearm main air duct 21a has a forearm lateral air outlet 21b, and a forearm soft elastic cotton 21c is provided inside the forearm main air duct 21a located on the outer periphery of the forearm lateral air outlet 21b. The rear arm air duct unit 22 includes a rear arm main air duct (see the forearm main air duct 21a shown), the bottom of the rear arm main air duct has a rear arm lateral air outlet 22b, and a rear arm soft elastic cotton (see the forearm soft elastic cotton 21c shown) is provided inside the rear arm main air duct located on the outer periphery of the rear arm lateral air outlet 22b. Preferably, the soft elastic cotton 21c for the forearm and the soft elastic cotton for the rear arm used in this embodiment are specifically slow-rebound small-hole cotton, which are respectively pasted to the bottom of the corresponding main air ducts 21a and 22a. They are soft and elastic, and are used to eliminate the gap between the main air duct and the rigid surface of the guide grille. More preferably, the top interior lining 1d is provided with a guide grille 1e located below the soft elastic cotton 21c for the forearm and a guide grille (not shown in the figure) located below the soft elastic cotton for the rear arm. The guide grille 1e and its corresponding soft elastic cotton are installed in a compressed manner to ensure the air delivery rate of its corresponding horizontal air outlets 21b and 22b, which can theoretically reach 100% air delivery rate.

[0035] Preferably, to ensure uniform airflow, in this embodiment, the forearm lateral air outlet 21b adopts a forearm lateral perforated plate with a plurality of small holes evenly distributed, and the rear arm lateral air outlet 22b adopts a rear arm lateral perforated plate with a plurality of small holes evenly distributed; more preferably, since the installation position of the forearm lateral perforated plate is close to the fan, the dynamic pressure is greater, the wind speed is higher, and the noise is higher during operation. Therefore, in order to balance the airflow of the forearm air duct unit 21 and the rear arm air duct unit 22 and reduce noise, the diameter of the small holes in the forearm lateral perforated plate is smaller than that in the rear arm lateral perforated plate, and the duty cycle of the small holes in the rear arm lateral perforated plate is greater than that in the forearm lateral perforated plate; specifically preferably, in this embodiment, the length L of the forearm lateral perforated plate is... 21b It is 754mm long and has a width of W. 21b The length of the forearm duct unit 21 is 100mm, the diameter of the small hole is 3mm, and the occupancy ratio of the small hole is less than 27%; the length of the transverse small hole plate of the rear arm is 754mm, the width is 150mm, the diameter of the small hole is 4.3mm, and the occupancy ratio of the small hole is greater than 30%. Of course, in other embodiments, other preferred solutions can also be adopted to balance the air volume of the forearm duct unit 21 and the rear arm duct unit 22, and this application does not impose a particularly unique limitation on its implementation.

[0036] Preferably, please refer to [see also...] Figure 9As shown, to improve air delivery, in this embodiment, the outer end of the forearm main air duct 21a extends downward along the two-position end wall profile 1c of the vehicle body to the air inlet 24, and the air inlet 24 is connected to the air outlet 53 of the air conditioning unit 5; specifically, preferably, in this embodiment, the forearm main air duct 21a adopts an aluminum alloy structure, and its inner cross-section length L 21a =1200mm, height H 21a =60mm, and its outer surface is covered with 21d of thermal insulation cotton, the thickness of which can be specifically selected as 10mm; two symmetrical air inlets 24 are provided on the outdoor side of the structure between the two end wall profiles 1c of the vehicle body, and each air inlet 24 is connected to the air outlet 53 of the air conditioning unit 5. The specific length and width dimensions L of each air inlet 24 are as follows. 24 *W 24 Specifications are 325*125mm, D 24a =162mm, D 24b =148mm and D 24c =500mm.

[0037] More preferably, please refer to [see also...] Figure 4 As shown, in this embodiment, the outer periphery of the air inlet 24 is provided with a boss 25, the height of which is 7.6mm; the side of the air outlet 53 is provided with a U-shaped waterproof baffle 54, and a rectangular sealing strip 55 (specifically made of rubber) is embedded inside the waterproof baffle 54. The sealing strip 55 and the boss 25 are squeezed together to form a sealed waterproof structure; more preferably, the top and sides of the air outlet 53 are further provided with inverted U-shaped rectangular rubber strips 56, the cross-sectional size of which is 30*20mm, which are adhered to the outer wall of the passenger room air duct module 2. When the air conditioning unit 5 is installed, it automatically forms a waterproof structure with the rectangular rubber strips 56.

[0038] Preferably, please refer to [see also...] Figure 2 and Figure 9 As shown, to facilitate the return air effect, in this embodiment, a return air duct 6 is provided inside the two-position end wall profile 1c of the vehicle body located below the air inlet 24. The return air duct 6 has an indoor return air inlet 62 that communicates with the interior of the passenger compartment 1a, and a return air outlet 62 that communicates with the vertically installed air conditioning unit 5. Specifically, preferably, in this embodiment, the return air duct 6 is rectangular in shape; wherein, the length and width dimensions L of the indoor return air inlet 61 are... 61 *W 61 The dimensions (L) of the return air outlet are 840*150mm and 62mm. 62 *W 62 The dimensions are 737*117mm; and the distance D between the return air outlet 62 and the air inlet 24 is... 60 It is 153mm.

[0039] Preferably, the forearm main air duct 21a is provided with a middle guide plate 71, a bottom arm guide plate 72, a reverse guide plate 73, and a forward guide plate 74. The middle guide plate 71 is arc-shaped and connected to the middle of the air inlet 24 for air diversion. Specifically, preferably, the dimensions of the middle guide plate 71 are H... 71a =67mm, L 71 =27mm, H 71b =60mm and R30mm (chamfer radius); the bottom arm guide plate 72 is arc-shaped and connects to the bottom of the air inlet 24 to reduce local air supply resistance. Specifically, preferably, the specific dimensions of the bottom arm guide plate 72 are 120mm (the distance between the bottom arm guide plate 72 and the bottom of the forearm main air duct 21a) and R60mm (chamfer radius); the reverse guide plate 73 is arc-shaped and connects to the transition air duct module 4 to guide air supply in the opposite direction. Specifically, preferably, the specific dimensions of the reverse guide plate 73 are 14mm (the distance between the reverse guide plate 73 and the side of the forearm main air duct 21a) and R60mm (chamfer radius); the front guide plate 74 is bent and located at the front end of the forearm main air duct 21a for guiding air supply. Specifically, preferably, the specific guiding angle α74 of the front guide plate 74 is 170° and the bending radius R 74 R60mm (chamfer radius).

[0040] Preferably, in this embodiment, the interior of the main air duct of the rear arm is provided with a middle diverter plate 81 and a middle partition plate 82 to divide the interior space of the main air duct of the rear arm; more preferably, the interior space of the main air duct of the rear arm is evenly divided by the middle diverter plate 81 and the middle partition plate 82. Specifically, preferably, in this embodiment, the chamfer radius of the middle diverter plate 81 is R90mm.

[0041] Preferably, please refer to [see also...] Figure 8 As shown, the cab air duct module 3 includes a cab top air duct 31, a driver's cab leg air duct 32, and a transition air duct 33, all located on the top of the cab 1b. The cab top air duct 31 is connected to the transfer air duct module 4 via the transition air duct 33. The transition air duct module 33 is located on the top of the equipment compartment 1f. The cab top air duct 31 has four parallel air outlet grilles installed at its bottom (the specific number of air outlet grilles 34 can be selected according to actual application requirements, but this embodiment does not impose any particular limitation on this). At the same time, cab air outlets 35 are symmetrically arranged on its left and right sides, and the cab air outlets 35 are connected to the driver's cab leg air supply duct 32. The airflow is delivered to the driver's leg area 36 through the driver's cab leg air supply duct 32, thereby improving the comfort of this area 36.

[0042] It should be noted that the structural dimensions proposed in this embodiment are one specific preferred implementation. Those skilled in the art can select specific dimensions based on the implementation content described in this application and in combination with actual application needs. These are not considered as special limitations of this application.

[0043] Preferably, this embodiment also proposes an urban sightseeing vehicle that adopts the air duct system described above in this embodiment; of course, those skilled in the art can apply the air duct system provided in this embodiment to other types of vehicles according to actual needs, and this embodiment does not impose any particular limitation on this.

[0044] This embodiment proposes a ventilation system structure for an urban sightseeing vehicle, consisting of a passenger compartment ventilation module 2, a transfer ventilation module 4, and a driver's cab ventilation module 3. Specifically, a vertically mounted air conditioning unit 5 is installed at the exterior end of the vehicle body, located between the passenger compartment 1a and the transfer ventilation module 4. During operation, the air conditioning unit delivers air to the passenger compartment ventilation module via the side. Furthermore, the air outlets 21b and 22b of the passenger compartment ventilation module 2 are horizontal (i.e., airflow is directed along the width of the passenger compartment), ensuring that the ventilation system does not occupy excessive vertical space within the passenger compartment 1a (specifically increasing the vehicle's vertical height by 178mm). Under current space constraints, this improves the passenger's comfort and safety. The standing comfort is improved, and the condensate generated by the vertically installed air conditioning unit 5 is automatically discharged directly to the station from the outside (the internal drain of the vertically installed air conditioning unit 5 can be equipped with a solenoid valve to control drainage). At the same time, rainwater will not enter the vehicle body. Under the current limited conditions, the passenger riding experience is improved, and the vehicle failure rate is reduced by more than 95%, saving maintenance costs. In addition, the air duct scheme proposed in this embodiment allows for the reservation of a large central area in the roof decoration, which can meet the needs of installing a large area of ​​transparent glass or multi-shaped and multi-functional LED colored lights on the roof, thereby diversifying the interior use of the passenger compartment and meeting various needs.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment includes only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A ventilation system for a vehicle, the vehicle comprising a body separately provided with a passenger compartment and a driver's compartment, characterized in that, The passenger compartment is equipped with a passenger compartment air duct module, and the driver's cab is equipped with a driver's cab air duct module. The passenger compartment air duct module is connected to the driver's cab air duct module through a transfer air duct module. An air conditioning unit is installed at the outer end of the vehicle body between the passenger compartment and the transfer air duct module. The passenger compartment air duct module includes an air supply duct. The air supply duct includes a front arm air duct unit and a rear arm air duct unit located between the top frame of the vehicle body and the top interior trim and at both ends of the passenger compartment. The left and right sides of the front arm air duct unit and the rear arm air duct unit are connected through a middle arm air duct unit. At the same time, the front arm air duct unit and the rear arm air duct unit are each provided with a lateral air outlet for supplying air to the interior of the passenger compartment. The forearm air duct unit includes a forearm main air duct that connects to the intermediate arm air duct unit and the transition air duct module respectively. The bottom of the forearm main air duct is provided with a forearm lateral air outlet, and the forearm main air duct located on the outer periphery of the forearm lateral air outlet is provided with forearm soft elastic cotton; and / or, the rear arm air duct unit includes a rear arm main air duct, the bottom of the rear arm main air duct is provided with a rear arm lateral air outlet, and the rear arm main air duct located on the outer periphery of the rear arm lateral air outlet is provided with rear arm soft elastic cotton. The outer end of the main air duct of the forearm extends downward along the end wall profile of the vehicle body to the air inlet, and the air inlet is connected to the air outlet of the air conditioning unit; a return air duct is provided inside the end wall profile of the vehicle body located below the air inlet, and the return air duct is provided with an indoor return air inlet connected to the interior of the passenger compartment and a return air outlet connected to the air conditioning unit. The forearm main air duct is internally provided with a middle guide plate and / or a bottom arm guide plate and / or a reverse guide plate and / or a front guide plate. The middle guide plate is arc-shaped and connected to the middle of the air inlet for air diversion. The bottom arm guide plate is arc-shaped and connected to the bottom of the air inlet to reduce local airflow resistance. The reverse guide plate is arc-shaped and connected to the transition duct module for reverse airflow guidance. The front guide plate is bent and located at the front end of the forearm main air duct for airflow guidance. And / or, the rear arm main air duct is internally provided with a middle diversion plate and / or a middle partition plate to divide the internal space of the rear arm main air duct. The cab air duct module includes a cab top air duct, a driver's cab leg air duct, and a transition air duct. The cab top air duct is connected to the transition air duct module via the transition air duct, which is located on the top of the equipment vehicle compartment. The cab top air duct has at least one air outlet grille installed at its bottom, and cab air outlets are symmetrically arranged on its left and right sides. The cab air outlets are connected to the driver's cab leg air duct, which delivers airflow to the driver's leg area, thereby improving the comfort of that area.

2. The air duct system according to claim 1, characterized in that, The top interior is equipped with a flow guide grille located below the soft elastic cotton of the forearm or the soft elastic cotton of the rear arm. The flow guide grille and its corresponding soft elastic cotton are installed in a compressed manner to ensure the air delivery rate of the corresponding horizontal air outlet.

3. The air duct system according to claim 1, characterized in that, The forearm lateral air outlet adopts a forearm lateral perforated plate with a number of small holes evenly distributed, and the rear arm lateral air outlet adopts a rear arm lateral perforated plate with a number of small holes evenly distributed. The diameter of the small holes in the forearm lateral perforated plate is smaller than that in the rear arm lateral perforated plate, and the occupancy ratio of the small holes in the rear arm lateral perforated plate is greater than that in the forearm lateral perforated plate.

4. The air duct system according to claim 1, characterized in that, The air inlet has a protrusion on its outer periphery, and the air outlet has a U-shaped waterproof baffle on its side. A sealing strip is embedded inside the waterproof baffle, and the sealing strip and the protrusion are squeezed together to form a sealed and waterproof structure.

5. The air duct system according to claim 1, characterized in that, The air conditioning unit is a vertically installed air conditioning unit, with vertical vibration dampers fixedly installed symmetrically on the left and right sides of its bottom, and longitudinal vibration dampers fixedly installed symmetrically on the left and right sides of its top. At the same time, secondary anti-detachment ropes are symmetrically connected to the end wall profile of the vehicle body on the left and right sides of its top, which are used to reduce vibration and prevent detachment of the vertically installed air conditioning unit.

6. A city sightseeing vehicle, characterized in that, The air duct system described in any one of claims 1-5 is adopted.

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