A low-carbon and energy-saving green roof

Abstract

The application discloses a low-carbon and energy-saving building green roof, and belongs to the technical field of buildings. The building green roof comprises a roof board, a water storage tank arranged on the roof board and used for adjusting the temperature of the roof board, a heat collecting plate fixedly arranged on the top surface of the water storage tank and used for adjusting the temperature of the water storage tank, symmetrical slidingly arranged on the roof board and used for covering the heat collecting plate so as to adjust the illumination of the heat collecting plate, a circulating unit arranged on the roof board and used for circulating the liquid in the water storage tank and the drainage pipe, and a driving assembly arranged on the roof board and used for driving two solar panels to move away from or close to each other. The two solar panels are fixedly arranged on the upper side and the lower side of a toothed belt rotatably arranged on the roof board, so that the temperature in the room is effectively adjusted, and the energy emission and the energy consumption are further reduced.

Description

Technical Field

[0001] This invention belongs to the field of building technology, and in particular relates to a low-carbon and energy-saving green roof for buildings. Background Technology

[0002] With the rapid development of society and economy, low carbon and energy conservation are receiving increasing attention. Green, low carbon, and energy-saving buildings are being effectively promoted and widely used. There are various types of buildings, including prefabricated and concrete structures. The roof is an essential part of all buildings. Traditionally, roofs are simply covered directly. However, due to the increasing height of buildings and the fact that roofs are simply covered directly without any improvement, residents on the top floor often experience high temperatures in summer and low temperatures in winter. To improve the indoor temperature, residents typically use air conditioners or other appliances. However, the excessive use of appliances not only increases carbon emissions but also leads to increased electricity consumption, resulting in energy waste and air pollution. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a low-carbon and energy-saving green roof for buildings, which solves the problem that excessive indoor temperature, the inability of the roof to regulate the indoor temperature, leads to excessive electricity consumption and high carbon emissions.

[0004] This invention is implemented as follows: a low-carbon, energy-saving green roof for buildings, comprising a roof panel, and further comprising:

[0005] A water storage tank installed on the roof panel to regulate the roof panel temperature;

[0006] A heat collection plate fixedly installed on the top surface of the water storage tank to adjust the temperature of the water storage tank;

[0007] Symmetrically sliding installations are provided on the roof panel to cover the solar collectors, thereby adjusting the sunlight exposure of the solar collectors, as well as the two solar panels that convert sunlight into electrical energy, and the batteries used for storing the energy of the solar panels.

[0008] The drainage pipes are installed at an angle inside the roof panel to facilitate the flow and heat transfer of the liquid in the water storage tank, and the drainage pipes are arranged in a serpentine pattern.

[0009] The circulation unit, installed on the roof panel, is used to circulate the liquid in the drainage pipe and the water storage tank.

[0010] A drive assembly, mounted on the roof panel, is used to drive two solar panels to move away from and closer to each other, including rotating a toothed belt mounted on the roof panel, wherein the solar panels are respectively fixedly mounted on the upper and lower sides of the toothed belt.

[0011] As a preferred embodiment of the present invention, the circulation unit includes a power component and a circulation component. The power component includes a circulation box installed on the lower side of the water storage tank and communicating with the water storage tank. A first transmission shaft is rotatably arranged inside the circulation box. A turbine blade is installed at one end of the first transmission shaft, and the turbine blade is located at the drain outlet of the water storage tank draining into the circulation box. The other end of the first transmission shaft is connected to a first gearbox, and a half gear is provided at the output end of the first gearbox.

[0012] As a preferred embodiment of the present invention, the circulation assembly includes a circulation pipe fixedly mounted on the roof panel, one end of the drain pipe being connected to the circulation pipe and the other end being connected to the circulation tank; one end of the circulation pipe being connected to the water storage tank, and a second solenoid valve being provided at the connection points of the circulation pipe, the water storage tank, and the drain pipe, with a first solenoid valve slidably disposed inside the second solenoid valve, and a lifting assembly for moving the first solenoid valve being provided inside the circulation pipe.

[0013] As a preferred embodiment of the present invention, the lifting assembly includes a rotating sleeve rotatably disposed within a circulation pipe, a lead screw being threadedly connected to the rotating sleeve, the first solenoid valve being located at the end of the lead screw, a full gear being mounted on the rotating sleeve, the full gear and the half gear being movably meshed, a torsion spring for resetting being sleeved on the rotating sleeve, and a limiting bracket for guiding being provided on the lead screw.

[0014] As a preferred embodiment of the present invention, the cooling component is mounted on a solar panel, and when two solar panels are close together, it is used to cool the liquid circulating in the circulation tank. It includes a fan mounted on the circulation tank, the fan being located on one side of the turbine blades. A second drive shaft is rotatably mounted on one of the solar panels, and a conical tooth is mounted at the end of the second drive shaft. Another conical tooth is mounted on the drive shaft of the fan, and the two conical teeth are movably meshed. A second gearbox is mounted on the solar panel, and the end of the second drive shaft is fixedly connected to the input end of the second gearbox. The input end of the second gearbox is provided with a fan blade for driving it.

[0015] As a preferred embodiment of the present invention, a duct is provided through the circulation box, and a filter is provided at the end of the duct, and the filter is located at the bottom of the roof panel, for delivering the gas discharged by the fan into the circulation box to the room.

[0016] As a preferred embodiment of the present invention, the driving component includes a connecting frame fixedly mounted on a solar panel, the solar panel being fixedly mounted on a toothed belt via the connecting frame, the toothed belt being driven by a driving source, and the driving source being electrically connected to a battery.

[0017] As a preferred embodiment of the present invention, a brush plate is provided between the solar panel and the collector plate for cleaning the collector plate.

[0018] As a preferred embodiment of the present invention, a thermostat is provided at the bottom of the roof panel and the thermostat is located inside the room, and the gaps inside the roof panel are filled with sound insulation cotton.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention effectively converts solar heat into electrical energy through solar panels, eliminating the need for additional electricity and further reducing energy consumption. During operation, the solar panels move according to the indoor temperature, functioning not only as energy collectors but also as shaders to protect the heat collection components. This allows the device to adjust the roof temperature based on ambient temperature, thus regulating the indoor environment and reducing air conditioning usage. This saves energy and reduces emissions, making the device more practical and effective. Furthermore, the recycling of water resources prevents water waste during operation, further minimizing carbon emissions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the front view structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure from the lower side view of the present invention;

[0023] Figure 3 This is a schematic diagram of the front-view cross-sectional structure of the present invention. Figure 1 ;

[0024] Figure 4 This is a schematic diagram of the front-view cross-sectional structure of the present invention. Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the internal structure of the invention from a partial lower view.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure from a partial frontal view of the present invention;

[0027] Figure 7 This is a schematic diagram of the top-view opening structure of the present invention.

[0028] In the picture:

[0029] 1. Roof panel; 2. Water storage tank; 3. Heat collector plate; 4. Solar panel; 5. Drainage pipe; 6. Circulation box; 7. First drive shaft; 8. Turbine blade; 9. First gearbox; 10. Half gear; 11. Circulation pipe; 12. Rotating sleeve; 13. Lead screw; 14. Full gear; 15. Torsion spring; 16. First solenoid valve; 17. Second solenoid valve; 18. Battery; 19. Fan; 20. Second drive shaft; 21. Bevel gear; 22. Second gearbox; 23. Fan blade; 24. Air duct; 25. Filter; 26. Toothed belt; 27. Connecting frame; 28. Drive source. Detailed Implementation

[0030] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0031] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] like Figures 1 to 7 As shown, an embodiment of the present invention provides a low-carbon and energy-saving green roof for buildings, including a roof panel 1, and further comprising:

[0033] A water storage tank 2 is installed on the roof panel 1 to adjust the temperature of the roof panel 1;

[0034] A heat collection plate 3 is fixedly installed on the top surface of the water storage tank 2 to adjust the temperature of the water storage tank 2;

[0035] Symmetrically sliding arrangement on roof panel 1 is used to cover the heat collector 3, thereby adjusting the illumination of the heat collector 3, as well as the two solar panels 4 that convert sunlight into electrical energy, and the battery 18 for storing the energy of the solar panels 4.

[0036] The drainage pipe 5 is inclinedly installed inside the roof panel 1 and is used to flow and transfer heat to the liquid in the water storage tank 2. The drainage pipe 5 is arranged in a serpentine pattern.

[0037] A circulation unit, installed on the roof panel 1, is used to circulate the liquid in the drainage pipe 5 and the water storage tank 2.

[0038] A drive assembly, mounted on the roof panel 1, is used to drive two solar panels 4 to move away from and closer to each other, including rotating a toothed belt 26 mounted on the roof panel 1, with the solar panels 4 respectively fixedly mounted on the upper and lower sides of the toothed belt 26.

[0039] During operation, the equipment operates in two modes: one is to cool roof panel 1, lowering the indoor temperature (see reference). Figure 1 Another method is to heat the roof panel 2 to raise the indoor temperature (see reference). Figure 7 All of these are aimed at reducing the use of air conditioning and achieving energy conservation and emission reduction when using roof panel 1. The specific work is as follows:

[0040] When the indoor temperature is high, this is the reference. Figure 1 Two solar panels 4 are placed close to each other, simultaneously shielding the heat collector 3 on the water storage tank 2 to prevent the heat collector 3 from accumulating heat, thereby preventing the water temperature inside the water storage tank 2 from rising. (Reference) Figure 4 At this time, the water in the water storage tank 2 enters the circulation unit, and the circulation unit introduces the water into the serpentine drainage pipe 5. Since the water in the drainage pipe 5 is low temperature water, the water will fully cool the roof panel 1. At the same time, the water flows back into the water storage tank 2 through the circulation unit. The water forms a circulation during the flow, which can keep the temperature of the roof panel 1 and the water flow lower.

[0041] When the indoor temperature is low, this is the reference. Figure 7 The two solar panels 4 are driven to move away from each other by the drive component. When the solar panels 4 move away from each other, the heat collector 3 is exposed. At this time, the heat collector 3 collects heat through sunlight and heats the liquid in the water tank 2, so that the liquid in the water tank 2 rises steadily. When the liquid rises steadily, when the liquid passes through the circulation unit and the drainage pipe 5, its temperature will act on the roof panel 1, thereby achieving the effect of heating the inside of the roof panel 1.

[0042] During use, solar panel 4 can effectively convert solar heat into electrical energy to power the drive components, further reducing energy consumption;

[0043] This invention effectively converts solar heat into electrical energy through the solar panel 4 in the device, eliminating the need for additional electrical energy and further reducing energy consumption. During operation, the device controls the movement of the solar panel 4 according to the indoor temperature, allowing it to function not only as an energy collection component but also as a shading component to shield the heat collection components. This enables the device to adjust the temperature of the roof panel 1 based on the indoor temperature, thereby reducing the need for air conditioning. This saves energy and reduces emissions, making the device more practical and effective. Furthermore, the device utilizes water recycling, preventing water waste during operation and achieving temperature regulation while minimizing carbon emissions.

[0044] As a preferred embodiment of the present invention, the circulation unit includes a power component and a circulation component. The power component includes a circulation box 6 installed on the lower side of the water storage tank 2 and communicating with the water storage tank 2. A first transmission shaft 7 is rotatably arranged inside the circulation box 6. A turbine blade 8 is installed at one end of the first transmission shaft 7 and the turbine blade 8 is located at the drain outlet of the water storage tank 2 to drain water into the circulation box 6. The other end of the first transmission shaft 7 is connected to a first gearbox 9. A half gear 10 is provided at the output end of the first gearbox 9.

[0045] refer to Figure 4 When the liquid in the water tank 2 flows downward, it impacts the turbine blade 8, causing the turbine blade 8 to rotate. The impact force of the liquid drives the turbine blade 8 to rotate, which can effectively reduce the use of electricity and reduce carbon emissions. When the turbine blade 8 drives the first transmission rod to rotate, the first transmission shaft 7 drives the first gearbox 9 to rotate in the forward direction. The first gearbox 9 then drives the half gear 10 to rotate. At this time, the half gear 10 can drive the full gear 14 in the lifting assembly to rotate, thereby further improving the efficiency of the equipment during operation and reducing the use of electricity.

[0046] As a preferred embodiment of the present invention, the circulation assembly includes a circulation pipe 11 fixedly mounted on the roof panel 1, one end of a drain pipe 5 being connected to the circulation pipe 11 and the other end being connected to the circulation tank 6; one end of the circulation pipe 11 being connected to the water storage tank 2, and a second solenoid valve 17 being provided at the connection points of the circulation pipe 11 with the water storage tank 2 and the drain pipe 5, a first solenoid valve 16 being slidably mounted inside the second solenoid valve 17, and a lifting assembly for moving the first solenoid valve 16 being provided inside the circulation pipe 11;

[0047] refer to Figure 4 , 5 After the liquid enters the circulation tank 6, the circulation tank 6 delivers the liquid to the guide pipe 5. At this time, the guide pipe 5 can act as either a refrigerant or a heating element (depending on the temperature of the liquid). Simultaneously, the liquid flows into... Figure 5 In the circulation pipe 11, when liquid enters the circulation pipe 11, refer to Figure 6The process of liquid entering the circulation pipe 11 is as follows: First, two second solenoid valves 17 are opened, allowing the liquid to enter the bottom of the circulation pipe 11. As the liquid in the circulation pipe 11 gradually rises, the first solenoid valve 16 is opened and simultaneously lowered. When the first solenoid valve 16 descends to a certain position, the liquid is located above the first solenoid valve 16. Then, the first solenoid valve 16 is closed, and then driven to rise. The first solenoid valve 16 can push the liquid above it upward, allowing it to be discharged through the upper second solenoid valve 17 (the upper second solenoid valve 17 is connected to the water storage tank 2, and the lower second solenoid valve 17 is connected to the drainage pipe 5). This circulates the liquid back into the water storage tank 2, thus achieving liquid circulation and allowing it to replace electric heating and cooling.

[0048] As a preferred embodiment of the present invention, the lifting assembly includes a rotating sleeve 12 rotatably disposed within the circulation pipe 11, a lead screw 13 threadedly connected to the rotating sleeve 12, a first solenoid valve 16 located at the end of the lead screw 13, a full gear 14 mounted on the rotating sleeve 12, the full gear 14 and the half gear 10 being movably meshed, a torsion spring 15 for resetting the rotating sleeve 12 is sleeved on the rotating sleeve 12, and a limiting bracket for guiding the lead screw 13 is provided on the lead screw 13.

[0049] refer to Figure 6 When the half gear 10 drives the full gear 14 to rotate in the forward direction, the rotating sleeve 12 rotates simultaneously. When the rotating sleeve 12 rotates, the lead screw 13 moves upward under the limit of the limit frame. At the same time, the lead screw 13 drives the first solenoid valve 16 to rise, thereby transporting the liquid in the circulation pipe 11 to the water storage tank 2. When the rotating sleeve 12 rotates, the torsion spring 15 is compressed simultaneously. When the half gear 10 and the full gear 14 disengage, the torsion spring 15 drives the rotating sleeve 12 to rotate in the reverse direction, which causes the first solenoid valve 16 to descend. When the half gear 10 meshes with the full gear 14 again, the above steps will be repeated. Thus, during the operation of the equipment, mechanical energy can be effectively converted into kinetic energy, and the equipment can still achieve circulation without using electrical energy, thereby further realizing energy saving and emission reduction of the equipment.

[0050] As a preferred embodiment of the present invention, the cooling component is disposed on the solar panel 4, and when the two solar panels 4 are close together, it is used to cool the liquid circulating in the circulation tank 6. It includes a fan 19 mounted on the circulation tank 6, the fan 19 being located on one side of the turbine blade 8. A second drive shaft 20 is rotatably disposed on one of the solar panels 4, and a conical tooth 21 is mounted on the end of the second drive shaft 20. Another conical tooth 21 is disposed on the drive shaft of the fan 19. The two conical teeth 21 are movably meshed. A second gearbox 22 is mounted on the solar panel 4, and the end of the second drive shaft 20 is fixedly connected to the input end of the second gearbox 22. A fan blade 23 for driving the second gearbox 22 is disposed on the input end of the second gearbox 22.

[0051] refer to Figure 4 When the two solar panels 4 are close to each other, it means that there is no need to heat the liquid in the water tank 2. At this time, the two conical teeth 21 mesh with each other, and the fan blades 23 are located outside the roof panel 1. The fan blades 23 are driven to rotate by the external wind power. The fan blades 23 transmit power to the second drive shaft 20 through the second gearbox 22, so that the second drive shaft 20 drives the drive shaft of the fan 19 to rotate. At this time, the drive shaft drives the fan 19 to generate airflow. The airflow acts on the falling liquid, thereby cooling the liquid. When it circulates, the temperature is even lower, which further improves the cooling efficiency of the equipment.

[0052] refer to Figure 7 When the two solar panels 4 are far apart, the liquid needs to be heated. At this time, the two conical teeth 21 are far apart, so the operation of the fan 19 can be stopped, thus avoiding the airflow generated by the operation of the fan 19 to cool the liquid.

[0053] As a preferred embodiment of the present invention, a duct 24 is provided through the circulation box 6, and a filter 25 is provided at the end of the duct 24. The filter 25 is located at the bottom of the roof panel 1 and is used to transport the gas discharged into the circulation box 6 by the fan 19 to the room.

[0054] refer to Figure 4 The gas generated by the fan 19 enters the circulation box 6, which can cool the liquid in the circulation box 6 and exhaust the gas through the air duct 24. At the same time, the gas is filtered through the filter 25 before entering the room, thereby effectively accelerating the air circulation in the room and lowering the room temperature.

[0055] As a preferred embodiment of the present invention, the driving component includes a connecting frame 27 fixedly mounted on the solar panel 4. The solar panel 4 is fixedly mounted on the toothed belt 26 via the connecting frame 27. The toothed belt 26 is driven by a driving source 28, and the driving source 28 is electrically connected to the battery 18.

[0056] refer to Figure 1 When the two solar panels 4 are far apart, the battery 18 supplies power to the drive source 28. At the same time, the drive source 28 drives the toothed belt 26 to rotate. When the toothed belt 26 rotates, it pulls the two connecting frames 27 to move. When the two connecting frames 27 are close together, the solar panels 4 close. When the two connecting frames 27 are far apart, the solar panels 4 move away from each other, thereby achieving the adjustment of different liquid temperatures and realizing energy saving and emission reduction efficiency.

[0057] As a preferred embodiment of the present invention, a brush plate is provided between the solar panel 4 and the heat collection plate 3 for cleaning the heat collection plate 3;

[0058] refer to Figure 7Each time the solar panel 4 is moved, the heat collection plate 3 can be cleaned to prevent impurities on the surface of the heat collection plate 3 from affecting its heat collection efficiency.

[0059] As a preferred embodiment of the present invention, a thermostat is provided at the bottom of the roof panel 1, and the thermostat is located inside the room, and the gaps inside the roof panel 1 are filled with sound insulation cotton.

[0060] During operation, the thermostat can control the opening and closing of the solar panel 4, making it more intelligent to use. The sound insulation cotton can effectively prevent noise generated when the liquid flows, thus avoiding any impact on the indoor environment.

[0061] 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.

[0062] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-carbon and energy-saving green roof for buildings, comprising a roof board (1), characterized in that: Also include: Set on the roof (1), for adjusting the temperature of the roof (1) water storage tank (2); Fixedly arranged on the top surface of the water storage tank (2), for adjusting the temperature of the water storage tank (2) heat collecting plate (3); Symmetrically slidingly arranged on the roof (1), for covering the heat collecting plate (3), thereby adjusting the light of the heat collecting plate (3), and two solar panels (4) for converting sunlight into electrical energy; Set on the roof (1), for energy storage of solar panels (4) battery (18); Inclinedly arranged in the roof (1), for flow heat transfer of the liquid in the water storage tank (2) flow guide pipe (5), and the flow guide pipe (5) is arranged in a serpentine shape; Circulation unit, arranged on the roof (1), for circulating flow of the liquid in the flow guide pipe (5) and the water storage tank (2); The circulation unit comprises a power assembly and a circulation assembly; the power assembly comprises a circulation tank (6) installed on the lower side of the water storage tank (2) and penetrating the water storage tank (2), a first transmission shaft (7) rotatably arranged in the circulation tank (6), a turbine blade (8) mounted on one end of the first transmission shaft (7), and the turbine blade (8) located at a water outlet of the water storage tank (2) into the circulation tank (6), the other end of the first transmission shaft (7) drivingly connected with a first gear box (9), and a half gear (10) arranged on the output end of the first gear box (9); The circulation assembly comprises a circulation pipe (11) fixedly arranged on the roof (1), one end of the flow guide pipe (5) and the circulation pipe (11) penetratingly connected, the other end and the circulation tank (6) penetratingly connected; one end of the circulation pipe (11) and the water storage tank (2) penetratingly connected, the connection between the circulation pipe (11) and the water storage tank (2) and the flow guide pipe (5) is provided with a second electromagnetic valve (17), a first electromagnetic valve (16) slidingly arranged in the second electromagnetic valve (17), and a lifting assembly for moving the first electromagnetic valve (16) further arranged in the circulation pipe (11); The lifting assembly comprises a rotating sleeve (12) rotatably arranged in the circulation pipe (11), a screw rod (13) threadedly connected in the rotating sleeve (12), the first electromagnetic valve (16) located at the end of the screw rod (13), a full gear (14) mounted on the rotating sleeve (12), the full gear (14) and the half gear (10) movably engaged, a torsional spring (15) sleeved on the rotating sleeve (12) for resetting thereof, and a limiting frame provided on the screw rod (13) for guiding thereof Drive assembly, arranged on the roof (1), for driving the two solar panels (4) to move away from and close to each other, comprising a toothed belt (26) rotatably arranged on the roof (1), and the solar panels (4) are fixedly arranged on the upper and lower sides of the toothed belt (26) respectively.

2. A low-carbon and energy-saving building green roof according to claim 1, characterized in that: The cooling assembly is arranged on the solar panel (4), and when the two solar panels (4) are close, it is used for circulating and cooling the liquid in the circulating box (6), comprising a fan (19) mounted on the circulating box (6), the fan (19) is located on one side of the turbine blade (8), one of the second transmission shaft (20) is rotatably arranged on the solar panel (4), the end of the second transmission shaft (20) is provided with a conical tooth (21), the driving shaft of the fan (19) is provided with another conical tooth (21), the two conical teeth (21) are movably engaged, the second gear box (22) is mounted on the solar panel (4), the end of the second transmission shaft (20) is fixedly connected with the input end of the second gear box (22), the input end of the second gear box (22) is provided with a fan blade (23) for driving.

3. A low-carbon and energy-saving building green roof according to claim 2, characterized in that: A wind pipe (24) is arranged through the circulating box (6), the end of the wind pipe (24) is provided with a filter (25), and the filter (25) is located at the bottom of the roof panel (1), which is used for conveying the gas in the circulating box (6) to the house.

4. A low-carbon and energy-saving building green roof according to claim 3, characterized in that: The driving assembly comprises a connecting frame (27) fixedly arranged on the solar panel (4), the solar panel (4) is fixedly arranged on the toothed belt (26) through the connecting frame (27), the toothed belt (26) is driven by a driving source (28), and the driving source (28) is electrically connected with the storage battery (18).

5. A low-carbon and energy-saving building green roof according to claim 4, characterized in that: A brush plate is arranged between the solar panel (4) and the heat collecting plate (3), which is used for cleaning the heat collecting plate (3).

6. A low-carbon and energy-saving building green roof according to claim 5, characterized in that: A temperature controller is arranged at the bottom of the roof panel (1), and the temperature controller is located in the house, and the gap in the roof panel (1) is filled with sound insulation cotton.

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