A multi-pipe exhaust device

Abstract

The utility model provides a kind of multi-tube exhaust device, including gas collector, protective cover, exhaust pipe etc., by 3 and above exhaust pipe around the periphery of gas collector, the air hole provided on the sidewall of gas collector and the air hole provided on the sidewall of exhaust pipe are directly or through communication pipe one-to-one correspondence communication.The device can make full use of wind power, thermal buoyancy or photovoltaic power, etc.Exhaust, large exhaust capacity;At the same time, it solves the existing problems of air flow backflow, rain and snow leakage, easy to block, high noise, low wind resistance and other problems.The device can be used in places where exhaust, dehumidification, ventilation, heat dissipation or light transmission and illumination are required.

Description

Technical Field

[0001] This utility model relates to the fields of aerodynamics, thermal and solar energy utilization, and in particular to an exhaust device that utilizes natural wind energy, thermal pressure difference energy inside and outside a structure and solar energy. Background Technology

[0002] With the depletion of fossil fuels and their environmental pollution, people are paying more and more attention to the use of renewable energy, which has been promoted and applied to some extent in ventilation, exhaust and lighting.

[0003] Currently, several common exhaust devices that utilize natural wind and solar energy include: (1) Rotary non-powered wind hood. This type of exhaust device uses natural wind to drive the wind turbine to rotate, generating centrifugal force on the gas. Combined with the buoyancy of the hot air in the building space, it exhausts indoor polluted air. Its advantages are: firstly, it has a beautiful and dynamic appearance; secondly, it automatically adapts to wind from all directions without the need for a wind-blocking device. Its disadvantages are: firstly, the continuously rotating bearing is easily damaged and generates a lot of noise; secondly, the exhaust volume is low; thirdly, the manufacturing process is more complex and the amount of materials used is more; fourthly, when the wind hood is stationary, it is easy for airflow to backflow and rainwater to enter the wind hood; fifthly, it does not have the function of exhausting air using solar energy and providing light transmission. (2) Venturi tube exhaust device. This device uses the low-pressure zone generated when natural wind passes through the nozzle or Laval nozzle to draw in indoor polluted air. Its advantages are: firstly, it has a simple structure; secondly, it has a low cost. Its disadvantages are: firstly, it requires the installation of a wind direction tracking device; secondly, it does not have the function of exhausting air using solar energy and providing light transmission; thirdly, rainwater is easy to enter the exhaust device with the wind. (3) Airfoil exhaust device, for example: a ventilation device in patent 201010594258.0. Its advantages are: firstly, the structure is relatively simple; secondly, it does not require high-speed rotation and basically does not require maintenance. Its disadvantages are: firstly, a wind direction tracking device needs to be installed; secondly, it does not have the function of using solar energy for exhaust and light transmission; thirdly, rainwater is easy to enter the exhaust device. (4) Wind-gathering suction exhaust device, for example: a device for generating orderly flow in patent number 201010241209.9. One of its structures has a ventilation function. Its advantages are: firstly, the structure is relatively simple and does not require a wind-gathering device; secondly, it has no rotating parts and does not require maintenance. Its disadvantages are: small exhaust volume, relatively complex process, large amount of material used, and it does not have the function of using solar energy for exhaust and light transmission. (5) Straight pipe + protective cover exhaust cap: This is the most traditional exhaust device. Its advantage is that the structure is very simple. Disadvantages: First, backflow and rain leakage will occur when the incoming wind is obliquely cut or the installation direction is not appropriate; second, the exhaust efficiency is low and it does not have the function of using solar energy for exhaust and light transmission. (6) Cylindrical wind cap: The exhaust volume is large; but the structure is complex, and rainwater will enter the exhaust cap with the wind, and it does not have the function of using solar energy for exhaust and light transmission. (7) Umbrella-shaped wind cap: The structure is simple, but because a large flow space needs to be left between the bottom outer edge of the umbrella-shaped protective cover and the air outlet of the ventilation tube, the rain and snow protection and insect protection effects are poor; backflow will occur when the incoming wind is obliquely cut or the installation direction is not appropriate, and it does not have the function of using solar energy for exhaust and light transmission. (8) Conical wind cap: The structure and process are complex, the insect protection, bird protection and debris protection effects are poor, a water collection device needs to be set up, and it does not have the function of using solar energy for exhaust and light transmission. (9) Louver type: Advantages: No rotating parts, long service life, but it is easy to cause backflow and rain leakage, poor ventilation effect, and does not have the function of using solar energy for exhaust and light transmission.(10) Louvered + windproof fence type: The advantage is that there are no rotating parts, but this structure is easy to accumulate debris, has a large volume, uses a lot of materials, and is expensive. It also does not have the function of using solar energy for exhaust and light transmission. (11) Exhaust cap with streamlined body hood: The advantage is that it can effectively utilize external wind and indoor thermal pressure for exhaust, and can effectively prevent backflow, rain and snow, has no rotating parts, and has a long service life. However, it does not have the function of using solar energy for exhaust and light transmission. For example, the "Exhaust Device" in application number 202120414621.X. (12) Electric roof ventilator: There are currently many types of electric roof ventilators. They can use solar photovoltaic or combine with grid power to drive the ventilator. However, they cannot effectively utilize external wind energy for exhaust. Examples include patent application number 202222151671.0, "A Roof Fan", patent application number 202111583949.5, "A Solar Roof Fan and Its Operation Control Method", and patent application number 202122250966.9, "An Energy-Saving and Environmentally Friendly Roof Fan".

[0004] In conclusion, all kinds of structures require ventilation. How to make full use of renewable energy, increase the ventilation capacity of ventilation devices, and solve the problems of backflow, rain and snow leakage, low typhoon resistance, short lifespan, and high noise of current ventilation devices is an important issue. Summary of the Invention

[0005] The technical problem solved by this utility model is to find an exhaust device that can utilize natural wind power, indoor and outdoor thermal pressure difference and solar energy, has a simple structure, strong wind resistance, large exhaust volume, is protected against rain and snow, freezing or debris blockage, does not backflow, has low noise and long service life.

[0006] To achieve the above objectives and solve the above technical problems, the technical solution proposed by this utility model is as follows: A multi-pipe exhaust device includes a gas collecting pipe, a protective cover, and an exhaust pipe. The gas collecting pipe is a pipe with an open lower end and three or more ventilation holes on its side wall. The protective cover is a functional cover that is rainproof, allows light transmission while being rainproof, or can generate electricity while being rainproof. The protective cover is closed on the upper end of the gas collecting pipe or located above the upper end of the gas collecting pipe at a spatial distance. The exhaust pipe is a pipe with three or more open upper and lower ends and ventilation holes on its side wall, surrounding the gas collecting pipe. The ventilation holes on the side wall of the gas collecting pipe and the ventilation holes on the side wall of the exhaust pipe are directly connected or connected through a connecting pipe. Having three or more exhaust pipes around the gas collecting pipe results in a more balanced overall structure, a more aesthetically pleasing appearance, more uniform wind distribution in all directions, and a larger exhaust volume. The top of the gas collecting pipe is easily fitted with a concentrator or solar photovoltaic panel, making the concentrator or solar photovoltaic panel integrated with the exhaust device body.

[0007] In this technical solution, when an incoming horizontal wind simultaneously passes over the upper and lower ports of each exhaust pipe, according to Bernoulli's principle, it creates a negative pressure in the gas inside the exhaust pipe, thereby drawing out polluted gas from the structure through the gas collection pipe. When an incoming oblique wind or an upward or downward vertical wind blows towards the upper or lower port of a certain exhaust pipe, the horizontal component of the oblique wind can still pass over the exhaust ports of each exhaust pipe and draw in the gas inside the exhaust pipe. Its vertical component or vertical wind is discharged through the other port of the exhaust pipe. At the same time, when its vertical component or vertical wind flows through the exhaust pipe and passes through the side vents of the gas collection pipe, it can draw in some gas inside the gas collection pipe at the side vents of the gas collection pipe. Especially when the exhaust pipe is long enough, wind or rainwater from any direction will not enter the gas collection pipe. In addition, when the temperature inside the structure is higher than the temperature outside the structure, exhaust can also be achieved by relying on the temperature difference. This technical solution has no moving parts, will not generate wear, and will not produce mechanical noise. The exhaust pipe has open upper and lower ports, allowing for simultaneous exhaust and a large exhaust volume; the connected upper and lower ports prevent the accumulation of debris or ice and snow.

[0008] One possible technical solution for the aforementioned multi-pipe exhaust device is that an electric turbine is installed inside the gas collecting pipe. The motor of the electric turbine is fixed to the inner wall of the gas collecting pipe by a support body. The motor of the electric turbine is connected to a power source directly or through a controller and a battery. The power source is a solar photovoltaic cell, wind power, mains electricity, or a hybrid power source.

[0009] One possible technical solution for the aforementioned multi-pipe exhaust device is that the protective cover is a solar photovoltaic panel, and the power output from the solar photovoltaic panel is directly connected to the motor of the electric turbine or connected through a controller and a battery. The solar photovoltaic panel also has rain and snow protection capabilities.

[0010] One possible technical solution for the aforementioned multi-pipe exhaust device is that the protective cover is a flat plate, which is closed on the upper port of the gas collecting pipe. A solar photovoltaic panel is installed above the flat plate, and the power output by the solar photovoltaic panel is directly connected to the motor of the electric turbine or connected through a controller and a battery.

[0011] One possible technical solution for the aforementioned multi-pipe exhaust device is that the protective cover is a light-concentrating hood, and the inner surface of the gas collecting pipe is provided with a reflective layer. The light-concentrating hood can both gather outdoor light and guide it into the structure through the reflective layer on the inner surface of the gas collecting pipe, and prevent rain and snow from entering the structure. The light-concentrating hood may include a planar light-transmitting plate, a parabolic light-concentrating hood, a hemispherical light-concentrating hood, a diamond-shaped light-concentrating hood, or a Fresnel light-concentrating plate, etc.

[0012] For any of the aforementioned multi-pipe exhaust devices, a possible technical solution is to install protective nets on the upper and lower ends of each exhaust pipe or on the vent holes on the side wall of the gas collecting pipe. The protective nets can prevent insects and debris from entering the structure.

[0013] For any of the aforementioned multi-pipe exhaust devices, a possible technical solution is to install an airflow control valve inside the air collection pipe or at its lower port. The airflow control valve can adjust the exhaust volume as needed.

[0014] For any of the aforementioned multi-pipe exhaust devices, a suitable technical solution is to install a fire damper at the lower part of the gas collecting pipe or at its lower port. The fire damper's on / off temperature value can be set according to national standards.

[0015] In any of the aforementioned multi-pipe exhaust devices, a possible technical solution is that the gas collecting pipe is a transparent pipe or a pipe with a light-concentrating and light-guiding structure. The transparent pipe can concentrate external light and guide it into the structure.

[0016] In any of the aforementioned multi-pipe exhaust devices, a possible technical solution is that the vent holes on the side of the gas collecting pipe and the vent holes on the side of the exhaust pipe are connected one-to-one by a connecting pipe. The axis of the connecting pipe is inclined downwards at an angle of 0° to 60° relative to the horizontal axis, and the sum of the inner diameter cross-sectional areas of each exhaust pipe is greater than or equal to the inner diameter cross-sectional area of ​​the gas collecting pipe. Using a connecting pipe inclined downwards at a certain angle allows for a reduction in the height of each exhaust pipe and a decrease in material usage, provided that wind and rainwater from any direction do not enter the gas collecting pipe. Having the sum of the inner diameter cross-sectional areas of each exhaust pipe greater than the inner diameter cross-sectional area of ​​the gas collecting pipe increases the exhaust volume.

[0017] In any of the above-mentioned multi-pipe exhaust devices, an optional technical solution is that an LED lighting strip is installed on the pipe wall at the air inlet of the gas collecting pipe, and the LED lighting is connected to a power source via a switch.

[0018] In any of the above-mentioned multi-pipe exhaust devices, a possible technical solution is to provide a solar photovoltaic film on the outer surface of the exhaust pipe or the outer surface of the gas collecting pipe, and the solar photovoltaic film is directly connected to the motor of the electric turbine or connected through a controller or a battery.

[0019] In any of the above-mentioned multi-pipe exhaust devices, a suitable technical solution is to coat the inner surfaces of the gas collecting pipe, connecting pipe, and exhaust pipe with a high-temperature resistant coating material to facilitate the discharge of high-temperature flue gas.

[0020] Beneficial effects: The beneficial effects of the above-mentioned multi-pipe exhaust device include: (1) In terms of energy utilization, renewable energy can be fully utilized to achieve the goal of energy conservation and emission reduction. When there is wind, thermal pressure difference and no sunlight, the exhaust device can use wind energy and thermal pressure energy to run exhaust; when there is sunlight, the exhaust device can be driven by an electric turbine driven by solar photovoltaic cells to exhaust; when there is no wind, no sunlight and no thermal pressure difference, the exhaust device can be driven by an electric turbine driven by a battery configured with solar photovoltaic cells to exhaust; when there is no battery, exhaust and lighting can be powered by the power grid through the configured automatic transfer switch.

[0021] (2) In terms of structural characteristics, it is resistant to backflow, rain and snow, has low noise, and good resistance to strong winds. Rain and snow from any direction will not enter the structure; there will be no backflow of wind from any direction. It integrates the solar photovoltaic panel and the exhaust device, making installation and maintenance convenient and occupying little space.

[0022] (3) In terms of exhaust performance, the upper and lower ports of each exhaust pipe exhaust at the same time, the exhaust speed is faster, the exhaust volume is increased, and the exhaust efficiency is high.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Appendix Figure 1 This is a longitudinal section diagram of a four-pipe exhaust device with exhaust and light guiding functions according to this utility model.

[0025] Appendix Figure 2 Appendix to this utility model Figure 1 Top view.

[0026] Appendix Figure 3 This is a longitudinal section schematic diagram of a four-pipe exhaust device with a solar photovoltaic panel and an electric turbine according to the present invention.

[0027] Appendix Figure 4 This is a longitudinal section diagram of a three-pipe exhaust device according to the present invention.

[0028] Appendix Figure 5 Appendix to this utility model Figure 4 Top view.

[0029] In the diagram: 1-Gas collection pipe, 2-Protective cover (or concentrator or solar photovoltaic panel), 3-Exhaust pipe, 4-Connecting pipe, 5-Motor, 6-Turbine, 7-Battery, 8-MPPT controller, 9-Power cord, 10-Airflow control valve, 11-Support body.

[0030] In the diagram: solid lines with arrows represent airflow within the structure; double-dotted lines with arrows represent light rays; and dashed lines with arrows represent airflow from outside. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. The following embodiments are intended to illustrate the present invention, rather than to further limit the present invention.

[0032] Example 1: Figure 1 , Figure 2 The illustrated four-pipe exhaust device includes a gas collecting pipe 1, a protective cover 2, an exhaust pipe 3, and a connecting pipe 4. The gas collecting pipe 1 is a pipe with an open lower end serving as an air inlet and four vent holes on its side wall. The protective cover 2 is a light-concentrating cover that is both rainproof and light-transmitting, and it is closed on the upper end of the gas collecting pipe 1. The exhaust pipe 3 is a pipe surrounding the gas collecting pipe 1 with four open upper and lower ends serving as exhaust outlets and four vent holes on its side wall. The four vent holes on the side wall of the gas collecting pipe and the four vent holes on the side wall of the exhaust pipe are connected one-to-one through the connecting pipe 4. The axis of the connecting pipe 4 is angled downwards at 45° relative to the horizontal axis. The sum of the inner cross-sectional areas of all exhaust pipes 3 is 1.6 times the inner cross-sectional area of ​​the gas collecting pipe 1; the sum of the inner cross-sectional areas of all connecting pipes 4 is 1.6 times the inner cross-sectional area of ​​the gas collecting pipe 1.

[0033] During operation, when the incoming wind horizontally passes over the upper and lower ports of each exhaust pipe 3 simultaneously, according to Bernoulli's principle, a negative pressure is generated in the gas inside the exhaust pipe 3, thereby drawing out polluted gas from the structure through the gas collecting pipe 1. When the incoming wind blows obliquely, upward, or downward vertically towards the upper or lower port of a certain exhaust pipe 3, the horizontal component of the incoming wind can still pass over the exhaust ports of each exhaust pipe 3 and draw in the gas inside the exhaust pipe 3, while its vertical component, either upward or downward, is discharged through the other port of the exhaust pipe 3. Simultaneously, as its vertical component flows through the exhaust pipe 3, it passes through the vent holes on the side wall of the gas collecting pipe 1, which can draw in the gas inside the gas collecting pipe 1. In addition, when the temperature inside the structure is higher than the temperature outside the structure, exhaust can also be achieved by relying on the temperature difference. In this embodiment, there are no moving parts, so there is no wear or mechanical noise. Both the upper and lower ports of exhaust pipe 3 are open, allowing exhaust to be released simultaneously from both ports, resulting in a large exhaust volume. The upper and lower ports of exhaust pipe 3 are connected, preventing the accumulation of debris or ice and snow.

[0034] Test results for the exhaust device consisting of a 160mm inner diameter collection pipe 1 and four 110mm inner diameter exhaust pipes 1 are as follows: At an external wind speed of 3 m / s, the exhaust velocity inside the collection pipe 1 is 2.06 m / s; at an external wind speed of 5 m / s, the exhaust velocity is 3.2 m / s; at an external wind speed of 7.3 m / s, the exhaust velocity is 4.15 m / s; and at an external wind speed of 9.5 m / s, the exhaust velocity is 5.51 m / s. Comparative tests show that the exhaust velocity at all wind speeds is significantly higher than that of widely used spherical non-powered exhaust caps of the same specifications. Spherical non-powered exhaust caps require wind speeds exceeding 1.7 m / s to activate exhaust and also generate high noise levels.

[0035] When the external wind speed is 42 m / s, the device can run continuously for 3 hours without any damage to any parts, while the spherical unpowered wind cap breaks and becomes inoperable after only 15 minutes of operation.

[0036] Example 2: Figure 3 The four-pipe exhaust device shown includes a solar photovoltaic panel and an electric turbine, comprising an air collecting pipe 1, a protective cover (solar photovoltaic panel) 2, an exhaust pipe 3, a connecting pipe 4, an electric motor 5, a turbine 6, a battery 7, an MPPT (maximum power point tracking) controller 8, a power cord 9, an airflow control valve 10, and a support body 11. The air collecting pipe 1 is a pipe with an open lower end serving as an air inlet and four ventilation holes on its side wall. The protective cover 2 is a photovoltaic panel that serves as both rain protection and solar power generation; the photovoltaic panel 2 is enclosed at the upper end of the air collecting pipe 1 or located above the upper end of the air collecting pipe 1 at a spatial distance. The exhaust pipe 3 is a pipe surrounding the air collecting pipe 1 with four open upper and lower ends serving as exhaust outlets and four ventilation holes on its side wall. The four ventilation holes on the side wall of the air collecting pipe and the four ventilation holes on the side wall of the exhaust pipe are connected one-to-one via the connecting pipe 4. The axis of the connecting pipe 4 is angled downwards at 45° relative to the horizontal axis. The sum of the inner cross-sectional areas of each exhaust pipe 3 is 1.6 times the inner cross-sectional area of ​​the collecting pipe 1; the sum of the inner cross-sectional areas of each connecting pipe 4 is 1.6 times the inner cross-sectional area of ​​the collecting pipe 1. The motor 5 is fixed to the inner wall of the collecting pipe 1 via the support body 11. The protective cover (solar photovoltaic panel) 2 is connected to the battery 7 and the MPPT controller 8 via the power cable 9. The power terminals of the motor 5 are connected to the MPPT controller 8 via the power cable 9, and the battery 7 is connected to the MPPT controller 8. The motor 5 drives the turbine 6 to exhaust air. The air volume control valve 10 can control the exhaust volume as needed.

[0037] The connection between the protective cover (solar photovoltaic panel) 2, the battery 7, the MPPT controller 8, and the motor 5 via the power line 9 is existing technology. The electrical energy generated by the protective cover (solar photovoltaic panel) 2 can be directly input into the battery 7 for storage. The electrical energy generated by the protective cover (solar photovoltaic panel) 2 can also be directly supplied to the motor via the MPPT controller 8. When the electrical energy generated by the protective cover (solar photovoltaic panel) 2 is insufficient, the electrical energy stored in the battery can supply power to the MPPT controller 8 and the motor 9. Since the structure and connection relationship of each part of the protective cover (solar photovoltaic panel) 2, the battery 7, the MPPT controller 8, and the motor 5 via the power line 9 is existing technology, the detailed connection relationship of its endpoints will not be described in detail.

[0038] During operation, the device can exhaust air when there is external wind; when the temperature inside the structure is higher than the temperature outside the structure, exhaust air can be driven by the temperature difference. When there is sunlight, the electricity generated by the solar photovoltaic panel 2 drives the motor 5 and turbine 6 of the electric turbine to exhaust air; when there is both external wind and temperature difference and sunlight, all three can be used together to exhaust air; at night when there is no wind and no sunlight, the battery 7 can drive the motor 5 and turbine 6 of the electric turbine to exhaust air.

[0039] Example 3: Figure 4 , Figure 5 The three-pipe exhaust device shown includes a gas collecting pipe 1, a protective cover 2, and an exhaust pipe 3. The gas collecting pipe 1 is a pipe with an open lower end serving as an air inlet and three vent holes on its side wall. The protective cover 2 is a rainproof cover plate that seals the upper end of the gas collecting pipe 1. The exhaust pipe 3 is an arc-shaped plate surrounding the gas collecting pipe 1, with three open upper and lower ends serving as exhaust outlets. The arc-shaped plate and the outer wall of the gas collecting pipe 1 it surrounds form a crescent-shaped exhaust pipe 3. The three vent holes on the side wall of the gas collecting pipe 1 are directly connected to the inner cavity of the arc-shaped plate. The sum of the cross-sectional areas of the inner walls of all exhaust pipes 3 is equal to the cross-sectional area of ​​the inner diameter of the gas collecting pipe 1. In this embodiment, the vent holes of the gas collecting pipe 1 are directly connected to the exhaust pipe 3, resulting in a smaller volume and less material usage.

[0040] Although the present invention has been described in conjunction with preferred embodiments, the present invention is not limited to the specific structural forms set forth herein and in the accompanying drawings. Rather, it is intended to cover various alternatives, equivalents and devices derived from recombination of various feature elements within the scope of the present invention as defined in the claims.

Claims

1. A multi-pipe exhaust device, comprising an air collecting pipe, a protective cover, and an exhaust pipe, characterized in that: The gas collecting pipe is a pipe with an open lower end and three or more ventilation holes on its side wall; the protective cover is a functional cover that is waterproof or allows light to pass through, or waterproof and generates electricity, and is closed on the upper end of the gas collecting pipe or located above the upper end of the gas collecting pipe at a spatial distance; the exhaust pipe is a pipe with three or more open upper and lower ends surrounding the gas collecting pipe and ventilation holes on its side wall; the ventilation holes on the side wall of the gas collecting pipe and the ventilation holes on the side wall of the exhaust pipe are directly connected or connected through a connecting pipe.

2. The multi-pipe exhaust device according to claim 1, characterized in that: An electric turbine is installed inside the gas collecting pipe. The motor of the electric turbine is fixed to the inner wall of the gas collecting pipe by a support. The motor of the electric turbine is directly connected to the power supply or connected through a controller.

3. A multi-pipe exhaust device according to claim 2, characterized in that: The protective cover is a solar photovoltaic panel, and the power output from the solar photovoltaic panel is directly connected to the motor of the electric turbine or connected through a controller and a battery.

4. The multi-pipe exhaust device according to claim 1, characterized in that: The protective cover is a light-concentrating cover, and the inner surface of the gas collecting pipe is provided with a reflective layer.

5. A multi-pipe exhaust device according to claim 1, 2, 3, or 4, characterized in that: Protective nets are installed on the upper and lower ports of each exhaust pipe or on the side vents of the gas collecting pipe.

6. A multi-pipe exhaust device according to claim 1, 2, 3, or 4, characterized in that: An air volume control valve is installed inside the air collection pipe or on its lower port.

7. A multi-pipe exhaust device according to claim 1, 2, 3, or 4, characterized in that: A fire damper is installed in the lower part of the gas collection pipe or at its lower port.

8. A multi-pipe exhaust device according to claim 1, 2, or 3, characterized in that: The gas collecting tube is a transparent tube.

9. A multi-pipe exhaust device according to claim 1, 2, 3, or 4, characterized in that: The axis of the connecting pipe is inclined downwards at an angle of 0° to 60° with the horizontal axis as the reference, and the sum of the inner diameter cross-sectional areas of each exhaust pipe is greater than or equal to the inner diameter cross-sectional area of ​​the gas collecting pipe.

10. A multi-pipe exhaust device according to claim 6, characterized in that: The axis of the connecting pipe is inclined downwards at an angle of 0° to 60° with the horizontal axis as the reference, and the sum of the inner diameter cross-sectional areas of each exhaust pipe is greater than or equal to the inner diameter cross-sectional area of ​​the gas collecting pipe.

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