Intensive care unit disinfection and ventilation fresh air system

Abstract

The invention discloses an intensive care unit disinfection and ventilation fresh air system, and particularly relates to the technical field of hospital ventilation equipment.The intensive care unit disinfection and ventilation fresh air system comprises a fresh air box, an air inlet pipe fixedly communicates with one side of the fresh air box, an air outlet pipe fixedly communicates with the portion, close to the bottom of the air inlet pipe, of one side of the fresh air box, and a first connecting pipeline fixedly communicates with the other side of the fresh air box; an exhaust fan is fixedly mounted at the bottom of the first connecting pipeline; a fresh air treatment box is arranged on one side of the fresh air box. By arranging the temperature control mechanism and the rotary disinfection mechanism, entering of dust, impurities, germs and viruses is reduced from the source, the problem of bacterium breeding caused by too high humidity is avoided through the humidity adjusting function, the excellent air quality is further guaranteed, accurate control over the air temperature is achieved, and the air quality is improved. According to the intensive care unit, a proper temperature can be provided for a patient no matter in hot summer or cold winter, so that air in the intensive care unit is always kept in a high-cleanliness state, and an ideal environment is created for rehabilitation of the patient.

Description

Technical Field

[0001] The present invention relates to the technical field of hospital ventilation equipment, and more specifically, to a disinfection ventilation fresh air system for an intensive care unit. Background Art

[0002] The intensive care unit is a specialized ward in the hospital for centralized monitoring and treatment of critically ill patients. It provides highly specialized medical care services for patients with serious conditions, unstable vital signs, and potentially life-threatening conditions. In the intensive care unit, the quality of air plays a vital role in the patient's recovery, and the fresh air system needs to ensure the purification and disinfection effect of the intensive care unit.

[0003] During use, the existing fresh air equipment is inconvenient to adjust the air temperature and humidity in real time according to the specific needs of the intensive care unit. Too high or too low temperature, too high or too low humidity may cause discomfort to patients and affect their recovery process. In the hot summer, the temperature of the incoming fresh air is too high, and patients may become irritable and restless. The quality of the fresh air is easily polluted by using air conditioning for cooling, and the air conditioning is likely to cause indoor dryness and cause discomfort to patients. In a humid environment, bacteria are easy to breed, increasing the possibility of infection. At the same time, spraying disinfectant to disinfect the fresh air is likely to increase the humidity of the fresh air, further causing bacteria to grow. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a disinfection ventilation fresh air system for an intensive care unit to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a fresh air system for disinfection and ventilation of an intensive care unit, comprising a fresh air box, one side of the fresh air box is fixedly connected to an air inlet pipe, one side of the fresh air box is fixedly connected to an air outlet pipe near the bottom of the air inlet pipe, the other side of the fresh air box is fixedly connected to a first connecting pipe, and an exhaust fan is fixedly installed at the bottom of the first connecting pipe;

[0006] A fresh air treatment box is provided on one side of the fresh air box, and an exhaust fan is provided at the bottom of one side of the fresh air treatment box. A second connecting pipe is fixedly connected between the fresh air box, the fresh air treatment box and the exhaust fan, and the exhaust fan is installed at the bottom of the second connecting pipe. A temperature control mechanism is provided between the fresh air box and the fresh air treatment box, and a rotating disinfection mechanism is provided between the fresh air treatment box and the second connecting pipe.

[0007] Preferably, the temperature control mechanism includes a sealed isolation plate, which is fixed inside the fresh air box, a dust net is fixedly installed between the sealed isolation plate and the inner wall of the fresh air box, a first temperature sensor is fixedly installed on the top of the sealed isolation plate, and a wind shield is fixedly installed on the top of the sealed isolation plate close to the first temperature sensor.

[0008] Preferably, a semiconductor refrigeration plate is fixedly installed on the top of the inner wall of the new air box, the top of the semiconductor refrigeration plate passes through the new air box and extends to the top of the new air box, the cooling end of the semiconductor refrigeration plate is located inside the new air box, and the heating end of the semiconductor refrigeration plate is located outside the new air box.

[0009] Preferably, a humidity sensor is fixedly installed on the top of the inner wall of the fresh air processing box, a second temperature sensor is fixedly installed on the bottom of the inner wall of the fresh air processing box, heating pipes are fixedly installed on the top and bottom of the inner wall of the fresh air processing box, and a controller is fixedly installed on one side of the fresh air processing box.

[0010] Preferably, the controller is electrically connected to the first temperature sensor, the semiconductor refrigeration sheet, the humidity sensor, the second temperature sensor and the heating tube.

[0011] Preferably, the rotating disinfection mechanism includes a disinfectant tank, which is fixedly installed on the top of the fresh air treatment box. A refilling pipe is fixedly connected to the top of the disinfectant tank. A connecting pipe is fixedly connected to one side of the disinfectant tank. A rotating pipe is provided at one end of the connecting pipe, and a rotating joint is fixedly installed between the connecting pipe and the rotating pipe.

[0012] Preferably, a first gear is provided on the outer fixed sleeve of the rotating tube, a second gear is meshed on one side of the first gear, a motor is installed on one side of the second gear, a fixing plate is fixedly connected to the bottom of the motor, one end of the fixing plate is fixedly connected to one side of the fresh air treatment box, and the second gear is fixed at the output end of the motor.

[0013] Preferably, a plurality of liquid outlet holes are evenly opened on the outer surface of the rotating tube, the rotating tube is rotatably connected to the fresh air processing box, a plurality of rotating fan blades are fixedly connected to the outer side of the rotating tube, and a fixed sleeve is provided on the outer side of the rotating tube.

[0014] Preferably, a plurality of drainage holes are evenly formed on the outer surface of the fixed sleeve, and a bearing is fixedly installed between the fixed sleeve and the rotating tube.

[0015] Preferably, the cross-sectional shapes of the air inlet pipe, the air outlet pipe and the first connecting pipe are all set to be L-shaped.

[0016] Technical effects and advantages of the present invention:

[0017] 1. By setting up a temperature control mechanism and a rotating disinfection mechanism, the rotating fan blades rotate to break up the discharged disinfectant into atomized form. Due to the centrifugal force generated by the rotation, the atomized disinfectant diffuses to the surroundings, increasing the contact area between the disinfectant and the fresh air, and can efficiently disinfect the air. The atomized disinfectant is in full contact with the fresh air, which greatly improves the disinfection effect and further reduces the bacteria and viruses in the air, creating a safer recovery environment for patients. The system is equipped with a first temperature sensor and a second temperature sensor, which can monitor the air temperature in the fresh air box and the fresh air treatment box in real time. When the temperature is too high, the semiconductor refrigeration sheet starts to cool down; when the temperature is too low, the heating tube starts to heat up, ensuring that fresh air with a suitable temperature is provided to the intensive care unit. Accurate temperature control helps the patient's comfort and recovery. For some seriously ill patients, a stable temperature environment can reduce the body's stress response and is conducive to the recovery of body functions.

[0018] 2. The humidity sensor can monitor the air humidity in real time. When the humidity is too high, the controller controls the heating tube to heat up and evaporate the disinfectant, thereby reducing the air humidity. This avoids the problem of bacteria breeding in the ICU due to excessive humidity in the fresh air. A suitable humidity environment helps reduce bacterial growth and the possibility of infection in patients, providing patients with a relatively dry and clean air environment. The setting of the exhaust fan and exhaust fan ensures efficient ventilation in the ICU. Good ventilation helps reduce the concentration of carbon dioxide in the indoor air, increase the oxygen content, provide patients with sufficient oxygen supply, and promote the recovery of their respiratory function.

[0019] 3. In summary, through the mutual influence of the above-mentioned multiple effects, the special design of the air inlet duct combined with the preliminary filtration of the dustproof net and the efficient disinfection of the rotating disinfection mechanism, the entry of dust, impurities and pathogens and viruses is reduced from the source, providing extremely clean air for the intensive care unit. At the same time, the humidity adjustment function avoids the problem of bacteria breeding due to excessive humidity, further ensures the excellent air quality, and realizes precise control of air temperature. Whether in hot summer or cold winter, it can provide patients with suitable temperature. This series of measures work together to keep the air in the intensive care unit in a high cleanliness state, creating an ideal environment for the patient's recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the connection between the disinfectant tank and the fixed sleeve of the present invention.

[0023] Figure 4 For the present invention Figure 3 Rear view structural diagram.

[0024] Figure 5 It is a schematic structural diagram of the connection between the disinfectant tank and the rotating tube of the present invention.

[0025] Figure 6 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0026] Figure 7 It is a schematic diagram of the internal structure of the new air box of the present invention.

[0027] Figure 8 It is a schematic diagram of the internal structure of the fresh air processing box of the present invention.

[0028] The accompanying drawings are marked as follows: 1. fresh air box; 2. air inlet pipe; 3. air outlet pipe; 4. first connecting pipe; 5. exhaust fan; 6. fresh air treatment box; 7. exhaust fan; 8. second connecting pipe; 9. dust net; 10. first temperature sensor; 11. wind shield; 12. semiconductor refrigeration plate; 13. humidity sensor; 14. second temperature sensor; 15. heating tube; 16. controller; 17. disinfectant tank; 18. refilling tube; 19. connecting pipe; 20. rotating tube; 21. rotating joint; 22. first gear; 23. second gear; 24. fixing plate; 25. motor; 26. liquid outlet; 27. rotating fan blade; 28. fixing sleeve; 29. ​​drainage hole; 30. bearing; 31. sealing isolation plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As attached Figure 1-8 A fresh air system for disinfection and ventilation of an intensive care unit shown in the figure comprises a fresh air box 1, one side of the fresh air box 1 is fixedly connected to an air inlet pipe 2, one side of the fresh air box 1 is fixedly connected to an air outlet pipe 3 near the bottom of the air inlet pipe 2, the other side of the fresh air box 1 is fixedly connected to a first connecting pipe 4, and an exhaust fan 5 is fixedly installed at the bottom of the first connecting pipe 4;

[0031] A fresh air treatment box 6 is provided on one side of the fresh air box 1, and an exhaust fan 7 is provided at the bottom of one side of the fresh air treatment box 6. A second connecting pipe 8 is fixedly connected between the fresh air box 1, the fresh air treatment box 6 and the exhaust fan 7. The exhaust fan 7 is installed at the bottom of the second connecting pipe 8. A temperature control mechanism is provided between the fresh air box 1 and the fresh air treatment box 6, and a rotating disinfection mechanism is provided between the fresh air treatment box 6 and the second connecting pipe 8.

[0032] As attached Figure 7 As shown, the temperature control mechanism includes a sealed isolation plate 31, which is fixed inside the fresh air box 1, a dustproof net 9 is fixedly installed between the sealed isolation plate 31 and the inner wall of the fresh air box 1, a first temperature sensor 10 is fixedly installed on the top of the sealed isolation plate 31, and a wind shield 11 is fixedly installed on the top of the sealed isolation plate 31 close to the first temperature sensor 10, so as to facilitate preliminary temperature monitoring and filtering of the fresh air.

[0033] As attached Figure 1 , 7 As shown, a semiconductor refrigeration sheet 12 is fixedly installed on the top of the inner wall of the fresh air box 1. The top of the semiconductor refrigeration sheet 12 penetrates the fresh air box 1 and extends to the top of the fresh air box 1. The cooling end of the semiconductor refrigeration sheet 12 is located inside the fresh air box 1, and the heating end of the semiconductor refrigeration sheet 12 is located outside the fresh air box 1, so that the semiconductor refrigeration sheet 12 can cool down the high-temperature fresh air to avoid discomfort to patients due to the high temperature of the discharged fresh air.

[0034] As attached Figure 1 , 2 As shown in Figure 8, a humidity sensor 13 is fixedly installed on the top of the inner wall of the fresh air treatment box 6, a second temperature sensor 14 is fixedly installed on the bottom of the inner wall of the fresh air treatment box 6, a heating tube 15 is fixedly installed on the top and bottom of the inner wall of the fresh air treatment box 6, and a controller 16 is fixedly installed on one side of the fresh air treatment box 6. The controller 16 is electrically connected to the first temperature sensor 10, the semiconductor refrigeration sheet 12, the humidity sensor 13, the second temperature sensor 14 and the heating tube 15. The first temperature sensor 10 and the second temperature sensor 14 transmit temperature information to the controller 16, and the start-up of the semiconductor refrigeration sheet 12 and the heating tube 15 is controlled by the controller 16. At the same time, the humidity can be sensed by the humidity sensor 13. After disinfection, the humidity is sensed by the humidity sensor 13. When the humidity is too high, it is dried by the heating tube 15 to reduce the humidity of the fresh air.

[0035] As attached Figure 1-6As shown, the rotating disinfection mechanism includes a disinfectant tank 17, which is fixedly installed on the top of the fresh air treatment box 6. A replenishing tube 18 is fixedly connected to the top of the disinfectant tank 17. A connecting tube 19 is fixedly connected to one side of the disinfectant tank 17. A rotating tube 20 is arranged at one end of the connecting tube 19. A rotating joint 21 is fixedly installed between the connecting tube 19 and the rotating tube 20, so that the disinfectant can enter the rotating tube 20 through the connecting tube 19, and the rotating tube 20 can rotate at the same time.

[0036] As attached Figure 1-6 As shown, a first gear 22 is fixedly sleeved on the outer side of the rotating tube 20, a second gear 23 is meshed with one side of the first gear 22, a motor 25 is installed on one side of the second gear 23, a fixing plate 24 is fixedly connected to the bottom of the motor 25, one end of the fixing plate 24 is fixedly connected to one side of the fresh air treatment box 6, and the second gear 23 is fixed to the output end of the motor 25 to facilitate driving the rotating tube 20 to rotate.

[0037] As shown in Figures 3-5, a plurality of liquid outlet holes 26 are evenly provided on the outer surface of the rotating tube 20, the rotating tube 20 is rotatably connected to the fresh air treatment box 6, a plurality of rotating fan blades 27 are fixedly connected to the outer side of the rotating tube 20, a fixed sleeve 28 is provided on the outer side of the rotating tube 20, a plurality of liquid discharge holes 29 are evenly provided on the outer surface of the fixed sleeve 28, a bearing 30 is fixedly installed between the fixed sleeve 28 and the rotating tube 20, the sprayed disinfectant is dispersed by the rotating fan blades 27, the disinfectant is atomized, the contact area between the disinfectant and the fresh air is increased, and the disinfection effect is improved.

[0038] As attached Figure 1 , 2 As shown in 7, the cross-sectional shapes of the air inlet pipe 2, the air outlet pipe 3 and the first connecting pipe 4 are all set to be L-shaped, which is convenient for the entry of fresh air and the exhaust of indoor air.

[0039] Working principle of the present invention: During the use of the fresh air system for disinfection and ventilation of an intensive care unit provided by the present invention, fresh air is drawn into the air inlet pipe 2 through the exhaust fan 7, and then enters the fresh air box 1. The L-shaped design of the air inlet pipe 2 helps to guide the air to flow smoothly into the fresh air box 1. At the same time, its specific shape may also reduce the direct entry of external debris to a certain extent. In the fresh air box 1, the sealed isolation plate 31 and the dustproof net 9 play a role in preliminary filtering of the air, blocking larger particles of dust and impurities. The sealed isolation plate 31 divides the internal space of the fresh air box 1 to ensure the orderly flow of air. The air inside the intensive care unit is drawn out through the exhaust fan 5 and discharged through the fresh air box 1 and the air outlet pipe 3.

[0040] The first temperature sensor 10 monitors the air temperature in the fresh air box 1 in real time, provides data for subsequent temperature control, and transmits the temperature information to the controller 16. The wind shield 11 can adjust the flow direction of the air to make it closer to the position of the semiconductor refrigeration plate 12 in the fresh air box 1, so that when cooling is needed, the air is closer to the semiconductor refrigeration plate 12 to ensure the cooling effect. If the first temperature sensor 10 detects that the air temperature is too high, the controller 16 will start the semiconductor refrigeration plate 12 for cooling according to the preset temperature range. The cooling end of the semiconductor refrigeration plate 12 is located inside the fresh air box 1, absorbs heat from the air to reduce the air temperature, and the heating end is located outside the fresh air box 1, dissipates heat to the external environment, and avoids secondary heating of the air in the fresh air box 1. , when the first temperature sensor 10 detects that the fresh air temperature is too low and needs to be heated, the air in the fresh air box 1 will enter the fresh air treatment box 6 through the first connecting pipe 4, and the controller 16 will start the heating pipe 15. The heating pipe 15 is located at the top and bottom of the inner wall of the fresh air treatment box 6, and can evenly heat the air. The second temperature sensor 14 in the fresh air treatment box 6 monitors the air temperature in real time, and stops heating when the air temperature rises to a suitable range. At the same time, during the disinfection process, the disinfectant may cause the fresh air humidity to increase, which is monitored by the humidity sensor 13. When the humidity is too high, the controller 16 controls the heating pipe 15 to heat, so that the disinfectant evaporates to a certain extent, reduces the air humidity, and avoids the problem of bacteria easily growing inside the monitoring due to excessive fresh air humidity;

[0041] The temperature-regulated air, under the action of the exhaust fan 7, enters the rotating disinfection mechanism between the fresh air treatment box 6 and the second connecting pipe 8 through the second connecting pipe 8 for disinfection. The disinfectant in the disinfectant tank 17 flows into the rotating tube 20 through the connecting pipe 19. The rotating tube 20 is connected to the connecting pipe 19 through a rotating joint 21, so that the rotating tube 20 can rotate freely under the drive of the motor 25. The motor 25 is fixed to one side of the fresh air treatment box 6 through a fixing plate 24, and its output end drives the second gear 23 to rotate. The second gear 23 is meshed with the first gear 22 on the outer side of the rotating tube 20, thereby driving the rotating tube 20 to rotate. When the rotating tube 20 rotates, the disinfectant is discharged through the liquid outlet 26 thereon, and at the same time The rotating blades 27 on the outside of the rotating tube 20 rotate together with the rotating tube 20 to break up the discharged disinfectant into atomized form. Due to the centrifugal force generated by the rotation, the atomized disinfectant diffuses to the surroundings and is discharged through the drainage holes 29 on the outer surface of the fixed sleeve 28. The fixed sleeve 28 is connected to the rotating tube 20 through a bearing 30 to ensure that the rotating tube 20 can rotate smoothly. The atomized disinfectant is in full contact with the fresh air passing through, which greatly increases the contact area between the disinfectant and the fresh air, thereby effectively disinfecting the fresh air. The air after disinfection and temperature adjustment is finally discharged from the fresh air system through the air outlet pipe 3, providing clean fresh air with suitable temperature for the intensive care unit to meet the ventilation needs of the intensive care unit.

[0042] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0043] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fresh air system for disinfection and ventilation of an intensive care unit, comprising a fresh air box (1), characterized in that: One side of the fresh air box (1) is fixedly connected to an air inlet pipe (2), one side of the fresh air box (1) near the bottom of the air inlet pipe (2) is fixedly connected to an air outlet pipe (3), the other side of the fresh air box (1) is fixedly connected to a first connecting pipe (4), and an exhaust fan (5) is fixedly installed at the bottom of the first connecting pipe (4); A fresh air treatment box (6) is arranged on one side of the fresh air box (1), an exhaust fan (7) is arranged at the bottom of one side of the fresh air treatment box (6), a second connecting pipe (8) is fixedly connected between the fresh air box (1), the fresh air treatment box (6) and the exhaust fan (7), the exhaust fan (7) is installed at the bottom of the second connecting pipe (8), a temperature control mechanism is arranged between the fresh air box (1) and the fresh air treatment box (6), and a rotating disinfection mechanism is arranged between the fresh air treatment box (6) and the second connecting pipe (8).

2. The intensive care unit disinfection and ventilation system according to claim 1, characterized in that: The temperature control mechanism comprises a sealing isolation plate (31), the sealing isolation plate (31) being fixed inside the fresh air box (1), a dust screen (9) being fixedly installed between the sealing isolation plate (31) and the inner wall of the fresh air box (1), a first temperature sensor (10) being fixedly installed on the top of the sealing isolation plate (31), and a wind shield plate (11) being fixedly installed on the side of the top of the sealing isolation plate (31) close to the first temperature sensor (10).

3. The intensive care unit disinfection and ventilation system according to claim 1, characterized in that: A semiconductor cooling sheet (12) is fixedly mounted on the top of the inner wall of the fresh air box (1); the top of the semiconductor cooling sheet (12) passes through the fresh air box (1) and extends to the top of the fresh air box (1); the cooling end of the semiconductor cooling sheet (12) is located inside the fresh air box (1), and the heating end of the semiconductor cooling sheet (12) is located outside the fresh air box (1).

4. The intensive care unit disinfection and ventilation system according to claim 1, characterized in that: A humidity sensor (13) is fixedly mounted on the top of the inner wall of the fresh air processing box (6), a second temperature sensor (14) is fixedly mounted on the bottom of the inner wall of the fresh air processing box (6), a heating pipe (15) is fixedly mounted on the top and bottom of the inner wall of the fresh air processing box (6), and a controller (16) is fixedly mounted on one side of the fresh air processing box (6).

5. The intensive care unit disinfection and ventilation system according to claim 4, characterized in that: The controller (16) is electrically connected to the first temperature sensor (10), the semiconductor cooling sheet (12), the humidity sensor (13), the second temperature sensor (14) and the heating tube (15).

6. The intensive care unit disinfection and ventilation system according to claim 1, characterized in that: The rotary disinfection mechanism comprises a disinfectant tank (17), the disinfectant tank (17) is fixedly mounted on the top of the fresh air treatment box (6), the top of the disinfectant tank (17) is fixedly connected to a liquid replenishment pipe (18), one side of the disinfectant tank (17) is fixedly connected to a connecting pipe (19), one end of the connecting pipe (19) is provided with a rotating pipe (20), and a rotating joint (21) is fixedly mounted between the connecting pipe (19) and the rotating pipe (20).

7. The intensive care unit disinfection and ventilation system according to claim 6, characterized in that: A first gear (22) is fixedly sleeved on the outer side of the rotating tube (20); a second gear (23) is meshed with one side of the first gear (22); a motor (25) is installed on one side of the second gear (23); a fixing plate (24) is fixedly connected to the bottom of the motor (25); one end of the fixing plate (24) is fixedly connected to one side of the fresh air treatment box (6); and the second gear (23) is fixed to the output end of the motor (25).

8. The intensive care unit disinfection and ventilation system according to claim 7, characterized in that: The outer surface of the rotating tube (20) is evenly provided with a plurality of liquid outlet holes (26); the rotating tube (20) is rotatably connected to the fresh air treatment box (6); the outer side of the rotating tube (20) is fixedly connected with a plurality of rotating blades (27); and the outer side of the rotating tube (20) is sleeved with a fixed sleeve (28).

9. The intensive care unit disinfection and ventilation system according to claim 8, characterized in that: The outer surface of the fixed sleeve (28) is evenly provided with a plurality of drainage holes (29), and a bearing (30) is fixedly installed between the fixed sleeve (28) and the rotating tube (20).

10. The intensive care unit disinfection and ventilation system according to claim 1, characterized in that: The cross-sectional shapes of the air inlet pipe (2), the air outlet pipe (3) and the first connecting pipe (4) are all set to be L-shaped.

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