A ward air supply and exhaust air curtain system and its use method

Abstract

The present invention discloses an air curtain system for supplying and exhausting air in a ward and a method of using the same, comprising air distribution boxes, room return air outlets and independent exhaust hoods which are arranged opposite to each other on both sides of a hospital bed, wherein the two air distribution boxes have the same structure, an air curtain air supply outlet is provided on the top of the air distribution box, a second air exhaust outlet is provided on the bottom of the air distribution box, a first air exhaust outlet is provided on the side of the air distribution box away from the hospital bed, a horizontal air supply outlet and an air exhaust outlet are provided on the side of the air distribution box close to the hospital bed, all the air outlets are connected through an air duct, a first opening and closing guide valve and a second opening and closing guide valve are provided on the air duct, fans are provided in the air curtain air supply outlet, the second air exhaust outlet and the air exhaust outlet; the air delivered by the air curtain air supply outlet enters the independent exhaust hood or the room return air outlet, the air supply and exhaust air curtain system of the present invention specifically purifies the air around the patient, improves the air quality in the patient's breathing zone, and avoids mutual infection between the patient and medical staff, and can be mainly applied to respiratory infectious disease wards in hospitals.

Description

Technical Field

[0001] The invention belongs to a hospital ventilation system, and in particular relates to a ward air supply and exhaust air curtain system and a use method thereof. Background Art

[0002] The risk of healthcare infection is ubiquitous in healthcare facilities around the world. One-third of healthcare-acquired infections may involve airborne transmission. To reduce the concentration and duration of exposure of patients and healthcare workers to pathogenic microorganisms, ASHRAE Standard 170 and some other guidelines recommend 6-12 ACH for infectious isolation rooms. Hospital heating, ventilation, and air conditioning systems provide continuous indoor air quality in addition to occupant comfort. Therefore, hospital HVAC systems are generally not load-driven, but are based on providing sufficient ventilation air to maintain a wide range of directional airflow relationships (from cleaner to less clean spaces) and air change rates to control, dilute, and eliminate hazards such as volatile medical gases, particulate matter, and airborne disease transmission. Currently, higher air change rates can better dilute the concentration of pollutants in patient rooms.

[0003] In the prior art, traditional ventilation is widely used for hospital bed ventilation, which can dilute the germs, but it cannot purify the air around the patient in a targeted manner, nor can it isolate medical staff from the patient. Especially during the epidemic period, the patient continues to exhale the virus, and doctors and nurses often inhale a large amount of polluted air in the process of diagnosing and treating the patient, which poses a certain threat to the health of medical staff. There are also devices for sterilization and disinfection using ultraviolet rays in hospitals. Ultraviolet rays with a wavelength of 254nm have a sterilizing effect, but this ultraviolet radiation can irritate the skin and eyes and cannot be used around the human body. Therefore, ultraviolet lamps are generally placed on the wall between the head and the ceiling of the personnel, which greatly reduces the sterilization efficiency of the system. The indoor relative humidity also has a significant effect on the sterilization efficiency of ultraviolet lamps. Nielsen et al. have proposed a low-speed personalized ventilation system, which uses chairs, neck pillows, beds, pillows, mattresses, clothes and other surfaces that are in natural contact with the head or body as air outlets to avoid cross infection. According to the current technical situation, it is difficult to set air outlets on irregular surfaces, and the air sent out is too close to the personnel, and the wind speed is not easy to control. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a ward supply and exhaust air curtain system and a method of using the same, which improves the air change rate in the ward, specifically purifies the air around the patient, and solves the problem of cross infection between the patient and medical staff.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an air curtain system for supplying and exhausting air in a ward, comprising air distribution boxes, a room return air outlet and an independent exhaust hood arranged opposite to each other on both sides of a bed, wherein the two air distribution boxes have the same structure, an air curtain air supply outlet is opened at the top of the air distribution box, a second air exhaust outlet is opened at the bottom of the air distribution box, a first air exhaust outlet is opened on the side of the air distribution box away from the bed, a horizontal air supply outlet and an exhaust outlet are opened on the side of the air distribution box close to the bed, the horizontal air supply outlet is arranged above the exhaust outlet, all the air outlets are connected through an air duct, a first opening and closing guide valve is arranged at the connection point between the air duct and the horizontal air supply outlet, a second opening and closing guide valve is arranged at the connection point between the air duct and the exhaust outlet, a first fan is arranged in the air curtain air supply outlet, a second fan is arranged in the second air exhaust outlet, and a third fan is arranged in the exhaust outlet; the air delivered by the air curtain air supply outlet enters the independent exhaust hood or the room return air outlet.

[0006] Furthermore, the room has two return air vents, which are arranged on the ceiling directly above the air curtain air supply vents; and the independent exhaust hood is arranged above the head of the hospital bed.

[0007] Furthermore, the first fan is a normally-on fan, and the second fan and the third fan are both on-off fans.

[0008] Furthermore, it also includes an infrared camera and a controller, wherein the infrared camera is arranged on a side of the air distribution box close to the bed, and the controller is arranged in the air distribution box. The infrared camera is used to capture the patient's posture, and the controller is used to control the opening and closing of the duct fan and the positions of the first opening and closing guide valve and the second opening and closing guide valve according to the patient's posture.

[0009] Furthermore, the air duct includes a main air duct and a branch air duct, the second air exhaust port is connected to the air curtain air supply port through the main air duct, a section of the main air duct close to the air curtain air supply port is provided with a first air exhaust port, two branch air ducts are connected to the main air duct, the two branch air ducts are respectively connected to the horizontal air supply port and the exhaust port, and the first opening and closing guide valve and the second opening and closing guide valve are respectively provided at the connection points between the two branch air ducts and the main air duct.

[0010] Furthermore, the first on-off guide valve and the second guide valve are connected to the air duct via flanges, and the main components of the first on-off guide valve and the second guide valve are streamlined valve plates.

[0011] Furthermore, filters are provided in the first air outlet and the second air outlet, and the filters are medium efficiency or high efficiency filters.

[0012] Furthermore, the air curtain air supply outlet, horizontal air supply outlet and air exhaust outlet are all slit-type grille air outlets, and the grille angle is adjustable, and the horizontal air supply outlet and the air exhaust outlet are the same in size.

[0013] Furthermore, the wind speed of the air curtain air supply outlet is 1.5m / s-2.0m / s, and the wind speed of the horizontal air supply outlet is 0.15m / s-0.22m / s.

[0014] The present invention also provides a method for using an air curtain system for supplying and exhausting air in a ward. Taking a patient lying on the right side as an example, when using the system, in the left side air distribution box, the second fan is turned on, and the second fan draws indoor air to the second exhaust port, and the air enters the air duct, and the second opening and closing guide valve is adjusted to close the air duct leading to the exhaust port, and the third fan is turned off; the first opening and closing guide valve is adjusted to open the air duct leading to the horizontal air supply port, and the air in the air duct is sent out from the horizontal air supply port, and the first fan is turned on, and the first fan draws indoor air from the first exhaust port, and the air is sent out from the air curtain air supply port to the independent exhaust hood or the room return air port, so as to form an air curtain on the left side of the bed; the right side air distribution box In the process, the first fan and the third fan are turned on, the second opening and closing guide valve is adjusted, the air duct leading to the exhaust port is opened, the first opening and closing guide valve is adjusted, and the air duct leading to the horizontal air supply port is closed; the first fan draws indoor air, and the third fan draws the air delivered from the horizontal air supply port of the left air distribution box and the harmful gases exhaled by the human body into the right air duct, and the air delivered from the horizontal air supply port of the left air distribution box and the harmful gases exhaled by the human body as well as the indoor air are all delivered from the air curtain supply port to the independent exhaust hood or the room return air port, forming an air curtain on the right side of the bed; when the patient lies on his left side, the air operation conditions in the air distribution boxes on both sides of the bed are opposite to those when the patient lies on the right side.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] The present invention discloses an air curtain air supply and exhaust system for a sickbed, comprising air distribution boxes on both sides of a sickbed, a room return air port and an independent exhaust hood. The air distribution box on one side of the sickbed extracts fresh air from an indoor air lake from a first air exhaust port, and delivers the fresh air to a breathing area of ​​a person on the sickbed from a horizontal air supply port, so that the patient can breathe fresh air and blow the exhaled air of the human body to the air distribution box on the other side, thereby greatly reducing the CO in the patient's breathing area. 2 The concentration improves the air quality in the patient's breathing area; the gas exhaled by the human body is extracted by the bellows on the other side and quickly merges into the vertical air curtain. The air curtain plays the role of isolating the airflow and specifically purifies the air around the patient to avoid mutual infection between the patient and medical staff. It can be mainly used in the respiratory infectious disease ward of the hospital.

[0017] The present invention arranges an opening and closing guide valve at the connection point between the main air duct and the branch air duct. The opening and closing guide valve can not only adjust the working condition and change the direction of the airflow, but also guide the airflow, reduce the local resistance of the air duct, and reduce the noise. The air curtain system of the present invention achieves the purpose of adjusting the working condition by adjusting the position of the opening and closing guide valve and the opening and closing of the fan. During the epidemic, the air delivered from the vertical air curtain air outlet is directly drawn away by the independent exhaust hood, and the air curtain formed thereby can also isolate the airflow and avoid cross infection.

[0018] The air distribution box of the present invention is provided with an infrared camera, which can identify the change of the patient's sleeping posture and automatically adjust the wind direction according to the change of the sleeping posture, so that the exhaled gas of the human body is always in the downstream area of ​​the air supply airflow, ensuring CO 2 The high-concentration area is always closest to the exhaust port and farthest from the supply port, creating a patient breathing zone with extremely high local air quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the air curtain system for supplying and exhausting air to the ward during normal use;

[0020] Figure 2 Schematic diagram of the air curtain system for supplying and exhausting air to the ward during the epidemic period;

[0021] Figure 3 The overall schematic diagram of the internal structure of the bellows on both sides of the bed;

[0022] Figure 4 Left view of the bellows for the left side of the bed;

[0023] Figure 5 Right view of the bellows for the left side of the bed;

[0024] Figure 6 It is a workflow diagram of the lateral airflow control system based on computer vision monitoring;

[0025] Among them: 1 is the air curtain supply outlet, 2 is the first exhaust outlet, 3 is the second exhaust outlet, 4 is the room return outlet, 5 is the main air duct, 6 is the branch air duct, 7 is the horizontal air supply outlet, 8 is the air distribution box, 9 is the exhaust outlet, 10 is the first opening and closing guide valve, 11 is the second opening and closing guide valve, 12 is the first fan, 13 is the second fan, 14 is the third fan, 15 is an independent exhaust hood, and 16 is an infrared camera. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 3As shown, the room background air supply mode of the present invention is displacement ventilation, and a ward air supply and exhaust air curtain system is provided, including an ordinary bed, an air distribution box 8, an independent exhaust hood 15 and a room return air outlet 4 fixedly arranged on both sides of the bed by a bracket, the air distribution box 8 is hollow inside, and the two air distribution boxes 8 are arranged opposite to each other and have the same structure. Each air distribution box 8 is provided with 5 air outlets, including:

[0028] like Figure 4 and Figure 5 As shown, an air curtain air supply port 1 is arranged on the top of the air distribution box 8, and the air supply port is a grille air supply port, which is used to supply air in a vertical direction to form an air curtain, and the air supply angle can be adjusted;

[0029] The first air outlet 2 arranged on the side of the air distribution box 8 away from the bed is used to provide the main air volume for the vertical air curtain.

[0030] A second air outlet 3 is arranged at the bottom of the air distribution box 8. A second fan 13 is arranged in the second air outlet 3. The second air outlet 3 is connected to an external air duct. The fresh air in the room air lake is extracted by the second fan 13 and sent into the air distribution box 8.

[0031] A horizontal air supply port 7 and an air exhaust port 9 are arranged on one side of the air distribution box 8 close to the bed. The horizontal air supply port 7 is arranged above the air exhaust port 9. The horizontal air supply port 7 and the air exhaust port 9 have the same size. The horizontal air supply port 7 is a grille air port with an adjustable air supply angle, which is used to supply processed indoor air to the patient's breathing area, blow away the harmful gases exhaled by the human body and bring them to the air exhaust port 9 of the air distribution box 8 on the other side;

[0032] The air outlet 9 is a grille air outlet, the direction of which can be adjusted to receive harmful gases blown to the vicinity of the air outlet 9 by the horizontal air supply port 7 of the air box 8 on the other side.

[0033] All air outlets are connected through the air ducts arranged in the air distribution box 8. The air ducts include a main air duct 5 and a branch air duct 6. The second air exhaust port 3 is connected with the air curtain air supply port 1 through the main air duct 5. A first air exhaust port 2 is arranged at a section of the main air duct 5 close to the air curtain air supply port 1. Two branch air ducts 6 are connected to the main air duct 5. The two branch air ducts 6 are respectively connected with the horizontal air supply port 7 and the exhaust port 9. A first opening and closing guide valve 10 is arranged at the connection point between the branch air duct 6 connected with the horizontal air supply port 7 and the main air duct 5. A second opening and closing guide valve 11 is arranged at the connection point between the branch air duct 6 connected with the exhaust port 9 and the main air duct 5.

[0034] A room return air vent 4 is arranged on the room ceiling directly above the air curtain air supply outlet 1. One air distribution box 8 is correspondingly provided with one room return air vent 4. The room return air vent 4 is used in normal times when there is no epidemic situation, and the air blown out of the air curtain air supply outlet 1 is sucked in, which can be used for the return air of the normal air conditioning system;

[0035] An independent exhaust hood 15 is arranged just above the middle of the head of the bed. An independent exhaust hood 15 is arranged corresponding to the two air distribution boxes 8. The independent exhaust hood 15 is only used during the epidemic. During the epidemic, by adjusting the air supply angle of the vertical air curtain air supply port 1, the independent exhaust hood 15 can completely absorb the air delivered by the air curtain air supply port 1, and discharge it to the outside after centralized processing.

[0036] The air curtain air supply port 1, the first air exhaust port 2 and the air exhaust port 9 are all provided with duct fans, which include a first fan 12, a second fan 13 and a third fan 14. The duct fans are the main power for airflow organization, wherein a first fan 12 is provided in the air curtain air supply port 1, and the first fan 12 is a normally open fan, which is used to provide power for air supply to form an air curtain; a second fan 13 is provided in the second air exhaust port 3, and the second fan 13 is an on-off fan, which is used to provide a stable wind speed for the air supply port; a third fan 14 is provided in the air exhaust port 9, and the third fan 14 is an on-off fan, which sucks the harmful gas exhaled by the human body near the air exhaust port 9 into the air exhaust port 9, and the two on-off fans cannot be used at the same time;

[0037] Preferably, the air distribution box 8 of the present invention is a box body, the outer surface of which is relatively regular, which is convenient for setting up air outlets, and a fan is also provided in the air outlet to facilitate adjusting the wind speed on the air outlet side to avoid people having a feeling of being blown by the wind.

[0038] Preferably, the duct fan adopts a fan that meets the noise standard, or a muffler is arranged in the air duct to achieve noise-free processing of the duct fan.

[0039] Preferably, the sizes of the horizontal air supply port 7 and the exhaust port 9 are both 0.2m*0.1m, the size of the air curtain supply port 1 is 0.3m*0.1m, and the size of the first air exhaust port 10 is 0.2m*0.1m.

[0040] Preferably, the wind speed at the air curtain outlet 1 is 1.5 m / s, and the wind speed at the horizontal air supply outlet 7 and the air exhaust outlet 9 is 0.2 m / s.

[0041] Preferably, the first opening and closing guide valve 10 and the second opening and closing guide valve 11 are connected to the air duct through a flange. The main component of the first opening and closing guide valve 10 and the second opening and closing guide valve 11 is a streamlined valve plate, which is rotated by a rotating shaft. The present invention sets the rotating shaft on the inner wall surface of the air duct section instead of crossing the air duct section. The opening and closing guide valve of the present invention can not only adjust the working conditions and change the direction of the airflow, but also guide the airflow, reduce the local resistance of the air duct, and reduce the noise.

[0042] Preferably, filters are provided in the first air outlet 2 and the second air outlet 3, and the filters are medium efficiency or high efficiency filters; the main function of the filters is to filter out pollutants such as dust and fly ash, keep the fan and the pipeline clean, and avoid polluting the air in the breathing zone.

[0043] Preferably, the independent exhaust hood 15 is a spherical exhaust hood, and the exhaust air is discharged to the outside after centralized treatment and cannot be used as return air.

[0044] Such as 3 and Figure 6 As shown, an infrared camera 16 is also provided on the side of the air distribution box 8 close to the bed, and a controller is provided in the air distribution box 8. The infrared camera 16 is used to capture the patient's posture. Based on the Euler video amplification technology, it can detect the patient's posture, including left-side lying, right-side lying and supine lying. The controller processes the information obtained through the Euler video amplification technology, outputs instructions to the actuator, changes the opening and closing of the second fan 13 and the third fan 14 in the air distribution box 8 and the position state of the first opening and closing guide valve 10 and the second opening and closing guide valve 11, thereby changing the supply and return air state of the air distribution boxes 8 on both sides of the bed, so as to achieve the purpose of autonomously adjusting the working conditions.

[0045] Specifically, if it is detected that the patient is lying on the right side, the air supply of the air distribution box 8 on the left side is started, the exhaust is closed, and the air supply of the air distribution box 8 on the right side is closed and the exhaust is opened by adjusting the first opening and closing guide valve 10 and the second opening and closing guide valve 11. If it is detected that the patient is lying on the left side, the air supply of the air distribution box 8 on the left side is closed, the exhaust is opened, and the air supply of the air distribution box 8 on the right side is opened and the exhaust is closed by adjusting the first opening and closing guide valve 10 and the second opening and closing guide valve 11. If it is detected that the patient is lying flat, the current operating state of the system is maintained unchanged.

[0046] When the present invention is used daily, the air distribution boxes 8 and the room return air outlet 4 on both sides of the bed are opened. When an infectious disease occurs (during an epidemic), the room return air outlet 4 is closed, and the air distribution box 8 and the independent exhaust hood 15 are opened to directly extract the air flow ejected from the air curtain supply outlet 1, and no return air is set.

[0047] by Figure 3 Taking the example of the present invention, the status of various structures inside the air boxes on both sides of the bed are introduced in detail when the air is supplied on the left side and exhausted on the right side.

[0048] In the left air distribution box 8, the second fan 13 is turned on. The second fan 13 draws indoor air of higher quality from the indoor air lake from the second air inlet 3 and enters the main air duct 5 after being filtered through a filter.

[0049] The first opening and closing guide valve 10 and the second opening and closing guide valve 11 on the two branch air ducts 6 are adjusted to open the horizontal air supply port 7 and close the air outlet 9, and the third fan 14 is turned off.

[0050] Adjust the grille angle of the horizontal air supply vent 7 to adjust the wind direction, CO 2 The density is greater than that of air and it is easy to settle in a lower position. Therefore, in general, the grille angle is set to face downward and at an angle of 10° to the horizontal line. Higher quality indoor air is extracted from the indoor air lake and delivered from the horizontal air supply port 7 at a speed of 0.2m / s.

[0051] The first air outlet 2 is in a normally open state, and the first fan 12 is turned on. The first fan 12 delivers the indoor air extracted from the first air outlet 2 through the air curtain air outlet 1 at a speed of 1.5 m / s, forming an air curtain on the left side of the bed.

[0052] At the same time, in the right air distribution box 8, the second fan 13 is turned off, and the first opening and closing guide valve 10 and the second opening and closing guide valve 11 on the two branch air ducts 6 are adjusted to make the horizontal air supply port 7 in a closed state and the exhaust port 9 in an open state, and the second fan 13 is turned on to remove the harmful gases (CO2) exhaled by the human body near the exhaust port 9. 2 ) is sucked into the main air duct 5 from the branch air duct 6.

[0053] The first fan 12 is in a normally open state. The first fan 12 takes in indoor air from the first air inlet 2 and extracts the harmful gases sucked in from the exhaust port 9 together, and sends them out from the air curtain air supply port 1 at a speed of 1.5m / s, forming a vertical air curtain on the right side of the bed. It is worth noting that the air volume of the air curtain on the right side of the bed mainly comes from the indoor air extracted from the first air inlet 2, and the air volume extracted from the exhaust port 9 accounts for only a small part.

[0054] Similarly, when the system supplies air from the right and exhausts air from the left, the status of the opening and closing fan and the opening and closing valve inside the air distribution box is completely opposite to the above-mentioned left air supply and right exhaust status, and the normally open fan is in the normally open state.

[0055] by Figure 1 Taking this as an example, the air flow directions of the system during normal times when there is no epidemic are introduced in detail (taking left supply and right exhaust as an example).

[0056] In the left air distribution box 8 , the second fan 13 of the second air outlet 3 is turned on to extract relatively high-quality indoor air from the indoor air lake and enter the main air duct 5 after being filtered through the filter.

[0057] The air extracted from the indoor air lake is delivered from the horizontal air supply port 7 through the air duct in the air distribution box 8, and the angle of the grille of the horizontal air supply port 7 is adjusted to adjust the air supply angle to a suitable angle, about 10° downward.

[0058] The air delivered from the horizontal air supply port 7 blows the harmful gases exhaled by the human body toward the exhaust port 9 of the right-side air distribution box 8, and due to the action of the third fan 14 in the exhaust port 9, the gas near the exhaust port 9 of the right-side air distribution box 8 is sucked into the right-side air distribution box 8, and is discharged from the air port of the air curtain supply port 1 of the right-side air distribution box 8 through the air duct in the right-side air distribution box 8.

[0059] The air curtain air supply ports 1 of the air distribution boxes 8 on the left and right sides deliver the air drawn in from the first air inlets 2 on both sides at a speed of 1.5 m / s in a vertical direction, forming an air curtain on both sides of the bed. The air delivered vertically by the right air distribution box 8 includes not only the air drawn in from the first air inlets 2 but also the surrounding gas of the human breathing zone sucked in from the air outlet 9.

[0060] Two room return air vents 4 are arranged on the ceiling directly above the air curtain air supply vents 1 with air boxes 8 on the left and right sides. The air delivered by the air curtain air supply vents 1 with air boxes 8 on the left and right sides enters the room return air vents 4 as return air of a conventional air-conditioning system.

[0061] Preferably, the independent exhaust hood 15 is not activated during normal times when there is no epidemic.

[0062] by Figure 2 Taking this as an example, the air flow directions of the system during the epidemic are introduced in detail (taking left supply and right exhaust as an example).

[0063] In the left air distribution box 8 , the second fan 13 of the second air outlet 3 is turned on to extract relatively high-quality indoor air from the indoor air lake and enter the main air duct 5 after being filtered through the filter.

[0064] The air extracted from the indoor air lake is delivered from the horizontal air supply port 7 through the air duct pipeline in the air distribution box 8, and the angle of the grille of the horizontal air supply port 7 is adjusted to adjust the air supply angle to a suitable angle, about 10° downward.

[0065] The air delivered from the horizontal air supply port 7 blows the harmful gases exhaled by the human body toward the exhaust port 9 of the right-side air distribution box 8, and due to the action of the third fan 14 in the exhaust port 9, the gas near the exhaust port 9 of the right-side air distribution box 8 is sucked into the right-side air distribution box 8, passes through the air duct pipeline in the right-side air distribution box 8, and is discharged from the air curtain supply port 1 of the right-side air distribution box 8.

[0066] The air curtain air supply ports 1 of the air distribution boxes 8 on the left and right sides deliver the air drawn in from the first air inlets 2 on both sides at a speed of 1.5 m / s in a vertical direction, forming an air curtain on both sides of the bed. The air delivered vertically by the right air distribution box 8 includes not only the air drawn in from the first air inlets 2 but also the surrounding gas of the human breathing zone sucked in from the air outlet 9.

[0067] An independent exhaust hood 15 is arranged in the middle above the head of the bed, and the air sent out from the air curtain air supply port 1 equipped with bellows 8 on the left and right sides will be sucked in by the independent exhaust hood 15 and discharged into the room after centralized treatment.

[0068] Preferably, during the epidemic, the return air vents 4 of the two rooms are closed and the air conditioning system does not use return air.

Claims

1. A ward air supply and exhaust air curtain system, characterized in that: The invention comprises an air distribution box (8), a room air return port (4) and an independent exhaust hood (15) arranged opposite to each other on both sides of a hospital bed, wherein the two air distribution boxes have the same structure, an air curtain air supply port (1) is provided on the top of the air distribution box, a second air exhaust port (3) is provided on the bottom of the air distribution box, a first air exhaust port (2) is provided on the side of the air distribution box away from the hospital bed, and a horizontal air supply port (7) and an air exhaust port (9) are provided on the side of the air distribution box close to the hospital bed, wherein the horizontal air supply port (7) is arranged above the air exhaust port (9), and all the air outlets are connected by setting an air distribution box. The air duct in the box (8) is connected, a first opening and closing guide valve (10) is provided at the connection point between the air duct and the horizontal air supply port (7), a second opening and closing guide valve (11) is provided at the connection point between the air duct and the exhaust port (9), a first fan (12) is provided in the air curtain air supply port (1), a second fan (13) is provided in the second air exhaust port (3), and a third fan (14) is provided in the exhaust port (9); the air delivered from the air curtain air supply port (1) enters an independent exhaust hood (15) or a room return air port (4); The first fan (12) is a normally-on fan, and the second fan (13) and the third fan (14) are both on-off fans; It also includes an infrared camera (16) and a controller, wherein the infrared camera (16) is arranged on a side of the air distribution box (8) close to the bed, and the controller is arranged in the air distribution box (8). The infrared camera (16) is used to capture the posture of the patient, and the controller is used to control the opening and closing of the duct fan and the positions of the first opening and closing guide valve (10) and the second opening and closing guide valve (11) according to the posture of the patient; The air duct comprises a main air duct (5) and a branch air duct (6); the second air exhaust port (3) is connected to the air curtain air supply port (1) through the main air duct (5); a section of the main air duct (5) close to the air curtain air supply port (1) is provided with a first air exhaust port (2); two branch air ducts (6) are connected to the main air duct (5); the two branch air ducts (6) are respectively connected to the horizontal air supply port (7) and the air exhaust port (9); and a first opening and closing guide valve (10) and a second opening and closing guide valve (11) are respectively provided at the connection points between the two branch air ducts (6) and the main air duct (5).

2. The ward air supply and exhaust air curtain system according to claim 1, characterized in that: There are two room return air vents (4), and the room return air vents (4) are arranged on the ceiling directly above the air curtain air supply vents (1); the independent exhaust hood (15) is arranged above the head of the hospital bed.

3. The ward air supply and exhaust air curtain system according to claim 1, characterized in that: The first on-off flow guide valve (10) and the second on-off flow guide valve (11) are connected to the air duct via flanges, and the main components of the first on-off flow guide valve (10) and the second on-off flow guide valve (11) are streamlined valve plates.

4. The ward air supply and exhaust air curtain system according to claim 1, characterized in that: The first air outlet (2) and the second air outlet (3) are both provided with filters, and the filters are medium efficiency or high efficiency filters.

5. The ward air supply and exhaust air curtain system according to claim 1, characterized in that: The air curtain air supply outlet (1), the horizontal air supply outlet (7) and the air exhaust outlet (9) are all slit-type grille air outlets, and the grille angle is adjustable. The horizontal air supply outlet (7) and the air exhaust outlet (9) are of the same size.

6. The ward air supply and exhaust air curtain system according to claim 1, characterized in that: The wind speed of the air curtain air supply outlet (1) is 1.5 m / s-2.0 m / s, and the wind speed of the horizontal air supply outlet (7) is 0.15 m / s-0.22 m / s.

7. A method for using a ward air supply and exhaust air curtain system according to any one of claims 1 to 6, characterized in that: Taking the patient lying on the right side as an example, when in use, in the left side air distribution box, the second fan (13) is turned on, and the second fan (13) draws indoor air to the second exhaust port (3), and the air enters the air duct, and the second opening and closing guide valve (11) is adjusted to close the air duct leading to the exhaust port (9), and the third fan (14) is turned off; the first opening and closing guide valve (10) is adjusted to open the air duct leading to the horizontal air supply port (7), and the air in the air duct is sent out from the horizontal air supply port (7), and the first fan (12) is turned on. The first fan (12) draws indoor air from the first exhaust port (2), and the air is sent out from the air curtain air supply port (1) to the independent exhaust hood (15) or the room return air port (4), forming an air curtain on the left side of the bed; in the right side air distribution box, the first fan (1) is turned on. 2) and the third fan (14), adjust the second opening and closing guide valve (11) to open the air duct leading to the exhaust port (9), adjust the first opening and closing guide valve (10) to close the air duct leading to the horizontal air supply port (7); the first fan (12) draws indoor air, the third fan (14) draws air delivered from the horizontal air supply port (7) of the left air distribution box and harmful gases exhaled by the human body into the right air duct, and the air delivered from the horizontal air supply port (7) on the left air distribution box and the harmful gases exhaled by the human body as well as the indoor air are all delivered from the air curtain air supply port (1) to the independent exhaust hood (15) or the room return air port (4), forming an air curtain on the right side of the bed; when the patient lies on the left side, the air flow in the air distribution boxes (8) on both sides of the bed is opposite to that when the patient lies on the right side.

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