Sampling and collecting device of living environment fresh air introduction system

Abstract

The invention discloses a sampling and collecting device of a human settlement environment fresh air introduction system, which comprises a system air pipe and a fixing frame arranged on one side of the outer wall of the air pipe, a sampling assembly is cooperatively arranged on the inner wall of the system air pipe close to the front end of the system air pipe, and one end of the sampling assembly is detachably connected with a filtering assembly. The rear end of the filtering assembly is detachably connected with a condensation dehumidification assembly, the rear end of the condensation dehumidification assembly is detachably connected with a three-way flow dividing pipe, the vertical end of the three-way flow dividing pipe is a particulate matter collecting branch, the other horizontal end of the three-way flow dividing pipe is a VOCs collecting branch, and the rear end of the VOCs collecting branch is detachably connected with an activated carbon adsorption pipe. A control assembly is arranged between the two ends of the three-way flow dividing pipe and one side of the rear end of the outer wall of the system air pipe in a matched mode, a control cabinet is arranged on one side of the upper end of the fixing frame, and a control panel, a wireless communication module and a voltage stabilizing module are installed in the control cabinet. When the fresh air environment is sampled, multi-point sampling can be achieved, interference of dust and water vapor can be reduced, and the sampling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of human settlement environment testing technology, and in particular to a sampling and collection device for a fresh air introduction system in a human settlement environment. Background Technology

[0002] The human settlement system is a complex system integrating "ecology-society-human settlement". The human settlement environment in plateau mountainous areas has typical characteristics of "low air pressure-low oxygen-strong ultraviolet radiation-large diurnal temperature range-easy accumulation of local pollutants". In the past 20 years, with the rapid advancement of tourism development and relocation projects in northwestern Yunnan, western Sichuan and Tibet and the Sanjiangyuan area of ​​Qinghai, a large number of homestays, health and wellness towns and scientific research stations have emerged in areas with an altitude of 2000-4000m.

[0003] Modern buildings are highly airtight, and people spend most of their time working and living indoors. Therefore, the quality of the indoor environment is receiving increasing attention. Maintaining good ventilation is crucial for human health. However, existing fresh air system sampling devices have three major drawbacks: 1) Single-point sampling cannot reflect the differences in pollutant concentrations caused by uneven airflow distribution within the duct, resulting in poor sample representativeness; 2) They lack pretreatment mechanisms, and dust and moisture in the fresh air can easily clog the sampling channel or interfere with the detection results; 3) They cannot collect particulate matter and VOCs simultaneously, requiring multiple samplings, which is inefficient and complex to operate. Summary of the Invention

[0004] The purpose of this invention is to provide a sampling and collection device for a fresh air introduction system in a residential environment. When sampling the fresh air environment, it can not only achieve multi-point sampling, but also reduce the interference of dust and water vapor and improve sampling efficiency.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A sampling and collection device for a fresh air introduction system for residential environments includes a system duct, a fixing bracket installed on one side of the outer wall of the duct, and a sampling component connected to the duct and extending out of the outer wall at one end, located near the front end of the duct. The end of the sampling component extending out of the duct is detachably connected to a filter component. The rear end of the filter component is detachably connected to a condensation and dehumidification component. The rear end of the condensation and dehumidification component is detachably connected to a polytetrafluoroethylene (PTFE) tube. The rear end of the PTFE tube is detachably connected to a three-way branch pipe. The vertical end of the three-way branch pipe is a particulate matter collection branch, and the other horizontal end is a VOCs collection branch. A miniature weighing sensor is installed on one side of the inner wall of the particulate matter collection branch near its opening. A fixing clip for fixing the glass fiber filter membrane is provided on one side of the upper end of the miniature weighing sensor. An activated carbon adsorption tube is detachably connected to the rear end of the VOCs collection branch. Both ends of the activated carbon adsorption tube are threaded with sealing caps that match them. Support frames for supporting the filter assembly and the three-way diversion pipe are respectively provided on the upper end of the fixing frame. A control component is provided between the rear end of the activated carbon adsorption tube, the upper end of the particulate matter collection branch and one side of the rear end of the outer wall of the system duct. A control cabinet is provided on one side of the upper end of the fixing frame. The control cabinet is equipped with a control panel, a wireless communication module and a voltage stabilizing module. The control panel communicates with the control terminal via the wireless communication module.

[0006] By adopting the above technical solution, during use, the sampling component is first installed at an appropriate position at the front end of the system duct using a fixing clip. Then, all components are installed, connected, and fixed. Next, the device is powered on, and after testing, it can be used normally. Operate the control panel in the control cabinet to start the operation of each component. The control component and sampling component sample the air in the system duct. As the air continues to flow, it passes through the filter component to remove dust, and then enters the condensation and dehumidification component for dehumidification. The sampled air is then divided into two branches through a three-way diversion pipe. The sampled air passes through the particulate matter collection branch, where particulate matter is intercepted by the glass fiber filter membrane, and the weighing sensor records the weight gain value in real time. In the VOCs collection branch, VOCs are adsorbed by the activated carbon adsorption tube, thus completing the sampling work. During sampling, the airflow of the two branches can be distributed by the control component. After sampling, the data information is transmitted to the control terminal through the wireless communication module. Finally, the activated carbon adsorption tube is removed and stored with a sealed cap to complete the sampling work, which is convenient for subsequent laboratory testing.

[0007] A further configuration of the present invention is as follows: the sampling assembly includes a sampling main tube arranged in a ring, a plurality of sampling holes opened at equal intervals at the rear end of the outer wall of the sampling main tube, a plurality of sampling branch tubes inclined upward and connected to the rear end of the outer wall of the sampling main tube at equal intervals, and a connecting tube connected to one side of the outer wall of the sampling main tube, wherein the sampling branch tubes and the sampling holes are arranged alternately.

[0008] By adopting the above technical solution, the airflow in the system duct can be sampled from multiple directions and angles during sampling, thereby improving the accuracy of sampling.

[0009] A further feature of the present invention is that the angle between each sampling hole and the axis of the main sampling pipe is 30°, and the angle between each sampling branch pipe and the axis of the main sampling pipe is 45°.

[0010] A further provision of the present invention is that a sampling auxiliary component is provided behind the sampling component and communicates with it. The sampling auxiliary component includes an auxiliary ring, a plurality of air inlets equally spaced on the outer wall of the auxiliary ring, an auxiliary pipe communicating with one side of the outer wall of the auxiliary ring and inclined downward, and an auxiliary rod provided on the other side of the outer wall of the auxiliary ring.

[0011] By adopting the above technical solutions, the sampling range can be increased, thereby improving the accuracy of the sampling results.

[0012] A further embodiment of the present invention is that the filter assembly includes a tube with openings at both ends, a nylon filter membrane detachably connected to the front end of the inner wall of the tube, and a support mesh detachably connected to the inner wall of the tube and disposed behind the nylon filter membrane.

[0013] A further feature of the present invention is that the nylon filter membrane is of the Whatman 7405-004 type with a pore size of 5μm, and the support mesh is made of stainless steel with a mesh count of 100 and a wire diameter of 0.12mm.

[0014] A further embodiment of the present invention is: the condensation dehumidification assembly includes a housing with openings at both the front and rear ends, a temperature and humidity sensor installed at the front end of the housing axis, heat dissipation fins disposed between the left and right sides of the inner wall of the housing, and semiconductor cooling chips respectively installed at the upper and lower ends of the heat dissipation fins with their cold ends in contact with them.

[0015] By adopting the above technical solution, when airflow passes through the heat dissipation fins, water vapor condenses on the surface of the low-temperature heat dissipation fins, thereby completing the dehumidification work.

[0016] A further embodiment of the present invention is that the activated carbon adsorption tube includes a fixed tube, quartz wool respectively disposed at both ends of the fixed tube, coconut shell activated carbon filled between the two quartz wools, and a fixing ring connected to both ends of the fixed tube and used to fix the corresponding quartz wool.

[0017] A further configuration of the present invention is as follows: the control component includes an air pump, a three-way pipe connected to the air inlet of the air pump, air inlet pipes connected to both ends of the three-way pipe, a rotor flow meter connected to the free ends of the two air inlet pipes and detachably connected thereto, and an air outlet pipe connected to the air outlet of the air pump. The air outlet pipe is inclined to the system duct and its outlet direction is consistent with the airflow direction.

[0018] By adopting the above technical solution, not only can the air flow of the two branches be controlled by the rotor flow meter, but the sampled airflow can also be returned to the system duct, and the return airflow can be prevented from impacting the main airflow and causing airflow turbulence in the sampling area.

[0019] In summary, the present invention has the following beneficial effects: Firstly, when sampling fresh air environments, this invention can not only achieve multi-point sampling, but also reduce the interference of dust and water vapor, thereby improving sampling efficiency. Secondly, the sampling component and sampling aid of the present invention can not only improve the sampling range, but also achieve full-section sampling with sampling holes and sampling branches at a certain angle, avoiding local eddy current interference and reducing the deviation between the sampling concentration and the actual concentration in the duct. Thirdly, this invention not only allows the airflow to flow back into the system duct during sampling, but also prevents the backflowing airflow from impacting the main airflow and causing airflow turbulence in the sampling area. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 It is mainly used to show the positional connection relationship of each component; Figure 3 This is a schematic diagram of the sampling component of the present invention; Figure 4 This is a schematic diagram of the structure of the filter component of the present invention; Figure 5 This is a schematic diagram of the structure of the condensation dehumidification component of the present invention; Figure 6 It is mainly used to showcase the three-way shunt pipe and the miniature weighing sensor; Figure 7 This is a schematic diagram of the activated carbon adsorption tube of the present invention; Figure 8 This is a schematic diagram of the structure of the control component of the present invention.

[0021] In the diagram: 1. System duct; 11. Mounting bracket; 12. Sampling assembly; 13. Main sampling pipe; 14. Sampling port; 15. Sampling branch pipe; 16. Connecting pipe; 2. Sampling auxiliary assembly; 21. Auxiliary ring; 22. Air inlet; 23. Auxiliary pipe; 24. Auxiliary rod; 3. Filter assembly; 31. Pipe body; 32. Nylon filter membrane; 33. Support mesh; 4. Condensation dehumidification assembly; 41. Housing; 42. Temperature and humidity sensor; 43. Heat dissipation fins; 44. Semiconductor cooling chip; 45. PTFE tube; 5. T-junction diverter pipe 51. Particulate matter collection branch; 52. VOCs collection branch; 53. Miniature weighing sensor; 54. Fixing clamp; 55. Glass fiber filter membrane; 6. Activated carbon adsorption tube; 61. Fixing tube; 62. Quartz wool; 63. Coconut shell activated carbon; 64. Fixing ring; 65. Sealing cap; 7. Control components; 71. Air pump; 72. T-joint; 73. Inlet pipe; 74. Rotor flow meter; 75. Outlet pipe; 8. Control cabinet; 81. Control panel; 82. Wireless communication module; 83. Voltage stabilizing module; 84. Support frame. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example, refer to Figure 1-8The sampling and collection device for the fresh air introduction system for human living environment includes a system duct 1, a fixing frame 11 set on one side of the outer wall of the duct, and a sampling component 12 connected to the system duct 1 and extending out of its outer wall at one end, located on the inner wall of the system duct 1 near its front end. The sampling component 12 includes a sampling main pipe 13 arranged in a ring, a number of sampling holes 14 opened at the rear end of the outer wall of the sampling main pipe 13 and distributed at equal intervals, a number of sampling branch pipes 15 inclined upward and connected to the rear end of the outer wall of the sampling main pipe 13 and distributed at equal intervals, and a connecting pipe 16 connected to one side of the outer wall of the sampling main pipe 13 and extending out of the system duct 1. The sampling branch pipes 15 and the sampling holes 14 are staggered. The angle between each sampling hole 14 and the axis of the sampling main pipe 13 is 30°, and the angle between each sampling branch pipe 15 and the axis of the sampling main pipe 13 is 45°.

[0027] Sampling auxiliary component 2 is provided behind sampling component 12 and is connected to it. Sampling auxiliary component 2 includes auxiliary ring 21, several air inlets 22 that are equally spaced and opened at the rear end of the outer wall of auxiliary ring 21, auxiliary pipe 23 that is connected to one side of the outer wall of auxiliary ring 21 and is inclined downward and connected to connecting pipe 16, and auxiliary rod 24 that is provided on the other side of the outer wall of auxiliary ring 21. One end of connecting pipe 16 that extends out of system air duct 1 is detachably connected to a filter component 3 that is connected to it. Filter component 3 includes tube body 31 that is open at both ends, nylon filter membrane 32 of model Whatman 7405-004 with 5μm pore size that is detachably connected to the front end of the inner wall of tube body 31, and support mesh 33 made of stainless steel with 100 mesh and 0.12mm wire diameter that is detachably connected to the inner wall of tube body 31 and provided behind nylon filter membrane 32.

[0028] The rear end of the filter assembly 3 is detachably connected to a condensing dehumidification assembly 4. The condensing dehumidification assembly 4 includes a housing 41 with openings at both the front and rear ends, a temperature and humidity sensor 42 installed at the front end of the housing 41 along its axis, heat dissipation fins 43 located between the left and right sides of the inner wall of the housing 41, and semiconductor cooling chips 44 installed at the upper and lower ends of the heat dissipation fins 43 with their cold ends in contact with them. There is space between the hot ends of the two semiconductor cooling chips 44 and the inner wall of the housing 41 to facilitate heat dissipation. The rear end of the condensing dehumidification assembly 4 is detachably connected to a polytetrafluoroethylene (PTFE) tube 45. The rear end of the PTFE tube 45 is detachably connected to a three-way diverter pipe 5. The filter assembly 3, the condensing dehumidification assembly 4, and the three-way diverter pipe 5 are all located at the same axial height. The vertical end of the three-way diverter pipe 5 is a particulate matter collection branch 51, and the other horizontal end is a VOCs collection branch 52. The airflow of the particulate matter collection branch 51 is 30%, and the airflow of the VOCs collection branch 52 is 70%.

[0029] A miniature weighing sensor 53 is installed on one side of the inner wall of the particulate matter collection branch 51 near its opening. A fixing clip 54 for fixing the glass fiber filter membrane 55 is provided on one side of the upper end of the miniature weighing sensor 53. The rear end of the VOCs collection branch 52 is detachably connected to an activated carbon adsorption tube 6. The activated carbon adsorption tube 6 includes a fixing tube 61, quartz wool 62 respectively set at both ends of the fixing tube 61, coconut shell activated carbon 63 filled between the two quartz wool 62, and a fixing ring 64 connected to both ends of the fixing tube 61 for fixing the corresponding quartz wool 62. Both ends of the activated carbon adsorption tube 6 are threadedly connected to a sealing cap 65 that matches it.

[0030] The upper end of the fixed frame 11 is provided with a support frame 84 for supporting the filter assembly 3 and the three-way diversion pipe 5. A control component 7 is provided between the rear end of the activated carbon adsorption pipe 6, the upper end of the particulate matter collection branch 51 and one side of the rear end of the outer wall of the system air duct 1. The control component 7 includes an air pump 71, a three-way pipe 72 connected to the air inlet of the air pump 71, air inlet pipes 73 connected to both ends of the three-way pipe 72, a rotor flow meter 74 connected to the free ends of the two air inlet pipes 73 and detachably connected to them, and an air outlet pipe 75 connected to the air outlet of the air pump 71. The air outlet pipe 75 is inclined to the system air duct 1 and its outlet direction is consistent with the airflow direction. A control cabinet 8 is provided on one side of the upper end of the fixed frame 11. The control cabinet 8 is equipped with a control panel 81, a wireless communication module 82 and a voltage stabilizing module 83. The control panel 81 communicates with the control terminal via the wireless communication module 82.

[0031] Usage: When using, first install the sampling component at an appropriate position at the front end of the system duct 1 using the fixing buckle. Then, install and fix each component. Next, power on the device. After the test is completed, it can be used normally. Operate the control panel 81 in the control cabinet 8 to start each component. The voltage stabilizing module 83 can ensure the stability of each component's operation. Then, operate the control component 7 to make the air pump 71 work, and allow the sampling component 12 to sample the air in the system duct 1 through the air inlet pipe 73. The air in the system duct 1 will be sampled through the sampling hole 14 and sampling branch pipe 15 on the sampling main pipe 13. Since the sampling hole 14 and the sampling branch pipe 15 form a certain angle with the sampling main pipe 13, the sampling can not only achieve full-section sampling and avoid local eddy interference, but also reduce the deviation between the sampled concentration and the actual concentration in the duct. At the same time, the sampling auxiliary component 2 can also cooperate to sample the airflow from different positions in the system duct 1, and then converge into the connecting pipe 16 through the auxiliary ring 21 and the auxiliary pipe 23.

[0032] As the sampled air continues to flow, it passes through the filter assembly 3 on the support frame 84 to remove dust. The air then enters the tube 31 and passes through the nylon filter membrane 32 and the support mesh 33 to remove dust. It then enters the condensation and dehumidification assembly 4 for dehumidification. The temperature and humidity sensor 42 detects the temperature and humidity content in the air. The semiconductor cooling chip 44 then operates, and the cooling generated is conducted to the heat dissipation fins 43. As the airflow flows, water vapor condenses on the surface of the low-temperature heat dissipation fins 43, thus completing the dehumidification. The dehumidified airflow flows out from the rear end of the housing 41, and the heat generated by the semiconductor cooling chip 44 during cooling flows backward with the airflow. At the same time, the airflow dissipates heat from the hot end of the semiconductor cooling chip 44.

[0033] Next, the sampled air is divided into two branches through the three-way diverter 5. The sampled air passes through the particulate matter collection branch 51, where the particulate matter is intercepted by the glass fiber filter membrane 55, and the weighing sensor records the weight gain value in real time. In the VOCs collection branch 52, VOCs are adsorbed by the activated carbon adsorption tube 6, thus completing the sampling work. During sampling, the rotor flow meter 74 collects the flow signal in real time. After sampling, the data information is transmitted to the control terminal through the wireless communication module 82. Finally, the activated carbon adsorption tube 6 is removed and stored under the sealing cap 65, thus completing the sampling and collection work for subsequent laboratory testing.

[0034] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make inventive modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A sampling and collection device for a fresh air introduction system for residential environments, comprising a system duct (1) and a fixing frame (11) disposed on one side of the outer wall of the duct, characterized in that: A sampling component (12) is provided on the inner wall of the system duct (1) near its front end, and one end of the sampling component (12) extends out of the outer wall. The end of the sampling component (12) extending out of the system duct (1) is detachably connected to a filter component (3). The rear end of the filter component (3) is detachably connected to a condensation dehumidification component (4). The rear end of the condensation dehumidification component (4) is detachably connected to a polytetrafluoroethylene pipe (45). The rear end of the polytetrafluoroethylene pipe (45) is detachably connected to a three-way diversion pipe (5). The vertical end of the three-way diversion pipe (5) is a particulate matter collection branch (51), and the other horizontal end is a VOCs collection branch (52). A miniature weighing sensor (53) is installed on one side of the inner wall of the particulate matter collection branch (51) near its opening. A fixing clip (54) for fixing the glass fiber filter membrane (55) is provided on one side of the upper end of the miniature weighing sensor (53). An activated carbon adsorption tube (6) is detachably connected to the rear end of the VOCs collection branch (52). Both ends of the activated carbon adsorption tube (6) are threaded with sealing caps (65) that match them. The upper end of the fixing frame (11) is also provided with a support for the filter assembly. 3) and the support frame (84) of the three-way diversion pipe (5), a control component (7) is provided between the rear end of the activated carbon adsorption pipe (6), the upper end of the particulate matter collection branch (51) and one side of the outer wall of the system duct (1), and a control cabinet (8) is provided on one side of the upper end of the fixed frame (11). The control cabinet (8) is equipped with a control panel (81), a wireless communication module (82) and a voltage stabilizing module (83). The control panel (81) communicates with the control terminal via the wireless communication module (82).

2. The sampling and collection device for the fresh air introduction system in the living environment according to claim 1, characterized in that: The sampling assembly (12) includes a sampling main tube (13) arranged in a ring, a plurality of sampling holes (14) opened at the rear end of the outer wall of the sampling main tube (13) and distributed at equal intervals, a plurality of sampling branch tubes (15) inclined upward and connected to the rear end of the outer wall of the sampling main tube (13) and distributed at equal intervals, and a connecting tube (16) connected to one side of the outer wall of the sampling main tube (13). The sampling branch tubes (15) and the sampling holes (14) are arranged alternately.

3. The sampling and collection device for the fresh air introduction system in the living environment according to claim 2, characterized in that: The angle between each sampling hole (14) and the axis of the main sampling pipe (13) is 30°, and the angle between each sampling branch pipe (15) and the axis of the main sampling pipe (13) is 45°.

4. The sampling and collection device for the fresh air introduction system in the living environment according to claim 3, characterized in that: The sampling component (12) is provided with a sampling auxiliary component (2) connected to it. The sampling auxiliary component (2) includes an auxiliary ring (21), a number of air inlets (22) that are equally spaced and opened on the outer wall of the auxiliary ring (21), an auxiliary tube (23) that is connected to one side of the outer wall of the auxiliary ring (21) and is inclined downward, and an auxiliary rod (24) that is provided on the other side of the outer wall of the auxiliary ring (21).

5. The sampling and collection device for the fresh air introduction system in a residential environment according to claim 1, characterized in that: The filter assembly (3) includes a tube (31) with openings at both ends, a nylon filter membrane (32) detachably connected to the front end of the inner wall of the tube (31), and a support mesh (33) detachably connected to the inner wall of the tube (31) and disposed behind the nylon filter membrane (32).

6. The sampling and collection device for the fresh air introduction system in a residential environment according to claim 5, characterized in that: The nylon filter membrane (32) is of the Whatman 7405-004 type and has a pore size of 5μm. The support mesh (33) is made of stainless steel and has a mesh size of 100 and a wire diameter of 0.12mm.

7. The sampling and collection device for the fresh air introduction system in a residential environment according to claim 1, characterized in that: The condensation dehumidification assembly (4) includes a housing (41) with openings at both the front and rear ends, a temperature and humidity sensor (42) installed at the front end of the housing (41) along its axis, heat dissipation fins (43) disposed between the left and right sides of the inner wall of the housing (41), and semiconductor cooling chips (44) installed at the upper and lower ends of the heat dissipation fins (43) respectively, with their cold ends in contact with them.

8. The sampling and collection device for the fresh air introduction system in the living environment according to claim 1, characterized in that: The activated carbon adsorption tube (6) includes a fixed tube (61), quartz wool (62) respectively disposed at both ends of the fixed tube (61), coconut shell activated carbon (63) filled between the two quartz wools (62), and a fixing ring (64) connected to both ends of the fixed tube (61) and used to fix the corresponding quartz wools (62).

9. The sampling and collection device for the fresh air introduction system in a residential environment according to claim 1, characterized in that: The control component (7) includes an air pump (71), a three-way pipe (72) connected to the air inlet of the air pump (71), an air inlet pipe (73) connected to both ends of the three-way pipe (72), a rotor flow meter (74) connected to the free ends of the two air inlet pipes (73) and detachably connected thereto, and an air outlet pipe (75) connected to the air outlet of the air pump (71). The air outlet pipe (75) is inclined to the system duct (1) and its outlet direction is consistent with its airflow direction.

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