Switchable epidemic prevention combined positive and negative pressure air conditioning device

Abstract

The utility model relates to a switchable epidemic prevention combined positive and negative pressure air conditioning device which is used for air return and air exhaust treatment of a biological laboratory and comprises an air treatment unit, an air exhaust unit, an air supply main pipe, an air outlet pipeline, an air return main pipe and an air exhaust main pipe. The other end of the air handling unit is communicated with one end of the air return main pipe; one end of the main air supply pipe away from the air handling unit communicates with an air supply outlet in the top of the biological laboratory; the air outlet pipeline is provided with four ports, two ports are respectively communicated with air outlets at the bottoms of two sides of the biological laboratory, the other two ports are respectively communicated with the air return main pipe and the air exhaust main pipe, a first valve is arranged at the communication part of the air return main pipe and the air outlet pipeline, and a second valve is arranged at the communication part of the air exhaust main pipe and the air outlet pipeline. According to the device, by controlling opening and closing of the first valve and the second valve, an air circulation path can be optimized; and a positive pressure operation mode or a negative pressure operation mode can be easily switched according to needs, and the flexibility is high.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a switchable flat-pressure combined positive and negative pressure air conditioning device. Background Art

[0002] In biological laboratory environments, especially those handling non-highly pathogenic microorganisms, the design and operation of air conditioning systems play a vital role, and biological laboratories are usually required to maintain a certain temperature, humidity and air quality to ensure the accuracy of experimental results and the safety of experimenters.

[0003] After searching, it is known that in existing patents, for example, CN201520392077.8 discloses an operating room with positive and negative pressure conversion function, which includes: an air circulation purification device; an air supply box, which is installed on the top of the operating room; an air supply pipe, one end of which is connected to the air outlet of the air circulation purification device, and the other end is connected to the air supply box; a return air duct, the inlet end of which is installed in the lower part of the operating room, close to the floor of the operating room; the outlet end is connected to the air inlet of the air circulation purification device; a first exhaust duct, one end of which is connected to the operating room, and the other end leads to the outside; an exhaust fan is provided in the exhaust duct; a first regulating valve, which is installed in the return air duct; a control device, which controls the operation or stop of the first regulating valve and the exhaust fan. The above-mentioned operating room with positive and negative pressure conversion function still has the following defects in actual application:

[0004] Its positive and negative pressure conversion function is composed of an air circulation purification device, an air supply box, an air supply duct, a return air duct, a first exhaust duct, a first regulating valve and a control device, and is realized by controlling the switch of the first regulating valve and the exhaust fan through the control device. In the negative pressure operation mode, it is necessary to continuously run high-energy-consuming equipment (such as exhaust fans) to maintain the negative pressure state in the room, which leads to an increase in overall energy consumption. If the return air and exhaust system are not designed reasonably, it may cause the system resistance to increase, thereby affecting the operating efficiency of the air handling unit; due to the fixed nature of each device, it has low flexibility in responding to different usage scenarios and needs. For example, when it is necessary to quickly switch between positive and negative pressure modes, it may not be able to respond quickly, making it impossible to meet the need to quickly switch the operating room or ward to negative pressure operation mode to control the risk of cross infection. Utility Model Content

[0005] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present disclosure is to provide a switchable normal and epidemic combined positive and negative pressure air-conditioning device. The switchable normal and epidemic combined positive and negative pressure air-conditioning device can optimize the air circulation path and reduce unnecessary energy loss by controlling the opening and closing of the first valve and the second valve. It is in positive pressure mode during normal operation. After being processed by the air handling unit, the air is sent to the biological laboratory through the air supply pipe, and then flows back to the air handling unit through the air outlet duct and the return air pipe, forming an efficient circulation loop; it is in negative pressure mode during epidemic work. The polluted air flows through the exhaust pipe to the exhaust unit for treatment and is directly discharged, avoiding mixing with clean air and improving air purification efficiency.

[0006] The switchable positive and negative pressure air conditioning device disclosed in the present invention is used for return air and exhaust air treatment in biological laboratories, and includes an air handling unit, an exhaust fan unit, an air supply pipe, an air outlet duct, a return air pipe and an exhaust pipe;

[0007] One end of the air handling unit is connected to one end of the air supply pipe, and the other end is connected to one end of the return air pipe;

[0008] One end of the air supply main away from the air handling unit is connected to the air supply outlet on the top of the biological laboratory;

[0009] The air outlet duct has four ports, two of which are connected to the exhaust ports at the bottom of both sides of the biological laboratory, and the other two ports are connected to the return air main and the exhaust air main, respectively. A first valve is provided at the connection between the return air main and the air outlet duct, and a second valve is provided at the connection between the exhaust air main and the air outlet duct.

[0010] One end of the return air main away from the air outlet duct is connected to the air handling unit, and one end of the exhaust air main away from the air outlet duct is connected to the exhaust unit;

[0011] By opening the first valve and closing the second valve, the air handling unit, the air supply main, the biological laboratory, the air outlet duct and the return air main are connected to form a circulating return air flow in a positive pressure operation;

[0012] By opening the second valve and closing the first valve, the air handling unit, the air supply main, the biological laboratory, the air outlet duct, the exhaust main and the exhaust unit are connected to form an exhaust circulation with negative pressure operation.

[0013] Preferably, a biological filtering device is provided at the exhaust port where the air outlet duct is connected to the biological laboratory.

[0014] Preferably, the biological filtration device is provided with a filter element, and the filter element is detachably arranged in the biological filtration device.

[0015] Preferably, there are at least three air supply outlets evenly spaced apart on the top of the biological laboratory, and each of the air supply outlets is connected to the air supply main pipe.

[0016] Preferably, the first valve and the second valve are both electric air valves.

[0017] Preferably, the switchable positive and negative pressure air-conditioning device further includes a regulating switch, and the air handling unit, the exhaust unit, the first valve and the second valve are all electrically connected to the regulating switch.

[0018] The advantages of the switchable positive and negative pressure air conditioning device disclosed in the present invention are:

[0019] 1. A switchable positive and negative pressure air conditioning device disclosed herein is used for return air and exhaust air treatment in a biological laboratory, comprising an air handling unit, an exhaust unit, an air supply pipe, an air outlet duct, a return air pipe and an exhaust pipe; one end of the air handling unit is connected to one end of the air supply pipe, and the other end is connected to one end of the return air pipe; the end of the air supply pipe away from the air handling unit is connected to the air supply outlet at the top of the biological laboratory; the air outlet duct has four ports, two of which are respectively connected to the exhaust outlets at the bottom of both sides of the biological laboratory, and the other two ports are respectively connected to the return air pipe and the exhaust pipe, and the return air pipe is connected to the air outlet duct A first valve is provided at the vent, and a second valve is provided at the connection between the exhaust pipe and the outlet duct; the end of the return air pipe away from the outlet duct is connected to the air handling unit, and the end of the exhaust pipe away from the outlet duct is connected to the exhaust unit; by opening the first valve and closing the second valve, the air handling unit, the supply air pipe, the biological laboratory, the outlet duct and the return air pipe are connected to form a circulating return air circulation with positive pressure operation; by opening the second valve and closing the first valve, the air handling unit, the supply air pipe, the biological laboratory, the outlet duct, the exhaust pipe and the exhaust unit are connected to form an exhaust circulation with negative pressure operation. By controlling the opening and closing of the first valve and the second valve, the device can optimize the air circulation path and reduce unnecessary energy loss. During normal operation, it is in positive pressure mode. After being processed by the air handling unit, the air is sent to the biological laboratory through the supply air pipe, and then returns to the air handling unit through the outlet duct and the return air pipe, forming an efficient circulation loop; during epidemic operation, it is in negative pressure mode, and the polluted air flows through the exhaust pipe to the exhaust unit for treatment and is directly discharged, avoiding mixing with clean air and improving air purification efficiency; and the device can be easily switched to positive pressure or negative pressure operation mode as needed, with high flexibility and easier operation and maintenance; it can be switched between normal and epidemic times to avoid the single use of circulating return air during an epidemic, which may endanger the personal safety of experimental personnel and may damage experimental samples.

[0020] 2. A switchable normal and epidemic combined positive and negative pressure air conditioning device disclosed in the present invention is provided with a biological filter device at the exhaust port where the air outlet duct is connected to the biological laboratory; the biological filter device is provided with a filter element, and the filter element is detachably provided in the biological filter device. By providing a biological filter device at the exhaust port, and the biological filter device is provided with a filter element, it can be ensured that aerosols and other pollutants generated in the biological laboratory during epidemic work have been processed the moment they leave the room and will not enter the air outlet duct, thus avoiding the possibility of aerosols and other pollutants in other main pipes; the filter element is detachably provided in the biological filter device, that is, the filter element is not installed during normal work. Compared with the situation where the filter is provided in the exhaust box, the resistance of the entire circulating return air circulation circuit can be low, and the gas flow in the circulating return air circulation circuit can be smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the assembly of an air conditioning device and a biological laboratory of a switchable flat and epidemic combined positive and negative pressure air conditioning device described in the present invention.

[0022] Description of reference numerals:

[0023] 10- Air handling unit;

[0024] 20-Exhaust fan unit;

[0025] 30-air supply supervisor;

[0026] 40-air outlet duct;

[0027] 50-return air main;

[0028] 60-Exhaust supervisor;

[0029] 70-air outlet;

[0030] 80-biological filtration device;

[0031] 90-adjustment switch;

[0032] 100-Biological Laboratory;

[0033] 110-first valve;

[0034] 120-Second valve. DETAILED DESCRIPTION

[0035] like Figure 1 As shown, the switchable positive and negative pressure air conditioning device described in the present disclosure is used for return air and exhaust air treatment of a biological laboratory 100, including an air handling unit 10, an exhaust fan unit 20, an air supply pipe 30, an air outlet duct 40, a return air pipe 50 and an exhaust pipe 60;

[0036] One end of the air handling unit 10 is connected to one end of the air supply main 30, and the other end is connected to one end of the return air main 50;

[0037] One end of the air supply main 30 away from the air handling unit 10 is connected to the air supply port 70 at the top of the biological laboratory 100;

[0038] The air outlet duct 40 has four ports, two of which are connected to the exhaust ports at the bottom of both sides of the biological laboratory 100, and the other two ports are connected to the return air main 50 and the exhaust air main 60, respectively. A first valve 110 is provided at the connection between the return air main 50 and the air outlet duct 40, and a second valve 120 is provided at the connection between the exhaust air main 60 and the air outlet duct 40.

[0039] The end of the return air duct 50 away from the air outlet duct 40 is connected to the air handling unit 10, and the end of the exhaust air duct 60 away from the air outlet duct 40 is connected to the exhaust unit 20;

[0040] By opening the first valve 110 and closing the second valve 120, the air handling unit 10, the air supply pipe 30, the biological laboratory 100, the air outlet duct 40 and the return air pipe 50 are connected to form a circulating return air circulation with positive pressure operation; that is, by opening the air handling unit 10 to supply air to the air supply pipe 30, the air supply pipe 30 introduces air from the air supply port 70 at the top of the biological laboratory 100, flows through the biological laboratory 100, and then enters the air outlet duct 40 through the exhaust ports at the bottom of both sides of the biological laboratory 100 and flows out. The first valve 110 is open and the second valve 120 is closed, so the gas entering the air outlet duct 40 flows to the return air pipe 50, flows back to the air handling unit 10 through the return air pipe 50, is processed by the air handling unit 10, and then supplied to the air supply pipe 30, forming a circulating return air circulation. At this time, the biological laboratory is in a positive pressure state, that is, a circulating return air circulation with positive pressure operation;

[0041] By opening the second valve 120 and closing the first valve 110, the air handling unit 10, the air supply main 30, the biological laboratory 100, the air outlet duct 40, the exhaust main 60 and the exhaust unit 20 are connected to form a negative pressure exhaust circulation; that is, by opening the air handling unit 10 to supply air to the air supply main 30, the air supply main 30 introduces air from the air supply port 70 at the top of the biological laboratory 100, flows through the biological laboratory 100, and then enters the air outlet duct 40 through the exhaust ports at the bottom of both sides of the biological laboratory 100 and flows out. The second valve 120 is open and the first valve 110 is closed, so the gas entering the outlet duct 40 flows to the exhaust main 60, and then flows from the exhaust main 60 to the exhaust unit 20 for treatment and then discharged to the outside. At this time, the biological laboratory is in a negative pressure state, that is, a negative pressure exhaust circulation;

[0042] According to the above structure, the device can optimize the air circulation path and reduce unnecessary energy loss by controlling the opening and closing of the first valve 110 and the second valve 120. During normal operation, it is in positive pressure mode. After being processed by the air handling unit, the air is sent to the biological laboratory 100 through the air supply pipe, and then flows back to the air handling unit through the outlet duct 40 and the return air pipe 50, forming an efficient circulation loop; during epidemic operation, it is in negative pressure mode, and the polluted air flows through the exhaust pipe 60 to the exhaust unit 20 for treatment and then is directly discharged, avoiding mixing with clean air and improving air purification efficiency; and the device can be easily switched to positive pressure or negative pressure operation mode as needed, with high flexibility and easier operation and maintenance; it can be switched between normal and epidemic use to avoid the use of single circulating return air during the epidemic, which may endanger the personal safety of the experimenters and may damage the experimental samples.

[0043] Furthermore, in this embodiment, a biological filter device 80 is provided at the exhaust port where the air outlet duct 40 communicates with the biological laboratory 100; the biological filter device 80 may be a HEPA filter, and the filtration efficiency of the HEPA filter can reach H14, with an efficiency greater than 99.99%.

[0044] Furthermore, in this embodiment, the biological filter device 80 is provided with a filter element, and the filter element is detachably disposed in the biological filter device 80;

[0045] By arranging a biological filter device 80 at the exhaust port, and the biological filter device 80 is provided with a filter element, it can be ensured that aerosols and other pollutants generated in the biological laboratory during epidemic work have been processed the moment they leave the room and will not enter the air outlet duct 40, thereby avoiding the situation where aerosols and other pollutants may exist in other main pipes; the filter element is detachably arranged in the biological filter device 80, that is, the filter element is not installed during normal work. Compared with the situation where the filter is arranged in the exhaust box, the resistance of the entire circulating return air circulation circuit can be low, and the gas flow in the circulating return air circulation circuit is smoother.

[0046] Furthermore, in this embodiment, there are at least three air supply outlets 70 evenly spaced apart on the top of the biological laboratory 100 , and each air supply outlet 70 is connected to the air supply main 30 ; three air supply outlets 70 are selected as the optimal number.

[0047] Furthermore, in this embodiment, the first valve 110 and the second valve 120 are both electric air valves; the electric air valve is driven by an electric motor to drive the actuator, so that the disc plate can rotate freely within a 90° range to achieve the purpose of opening and closing or adjusting the medium flow. The electric actuator can drive the rotation of the valve blade through the received control signal (such as current or voltage), thereby changing the cross-sectional area of ​​the air duct and realizing the adjustment of the air volume.

[0048] Furthermore, in this embodiment, the switchable positive and negative pressure combined air-conditioning device also includes a regulating switch 90, and the air handling unit 10, the exhaust fan unit 20, the first valve 110 and the second valve 120 are all electrically connected to the regulating switch 90; the start and stop of the air handling unit 10 and the exhaust fan unit 20 are controlled by the regulating switch 90, as well as the opening and closing of the first valve 110 and the second valve 120.

[0049] The following will combine the above content to fully explain the working process of a switchable flat-pressure combined positive and negative pressure air-conditioning device of this embodiment.

[0050] During normal operation of the biological laboratory 100, the first valve 110 is opened and the second valve 120 is closed by adjusting the switch 90. The air handling unit 10 is then turned on by adjusting the switch 90 to supply air to the air supply main 30. The air supply main 30 introduces air from the air supply port 70 at the top of the biological laboratory 100. After flowing through the biological laboratory 100, the air passes through the exhaust ports at the bottom of both sides of the biological laboratory 100 and enters the air outlet duct 40 for outflow. The gas entering the air outlet duct 40 flows to the return air main 50, flows back to the air handling unit 10 through the return air main 50, is processed by the air handling unit 10, and then is supplied to the air supply main 30, forming a circulating return air.

[0051] When the biological laboratory 100 is working during an epidemic, the second valve 120 is opened and the first valve 110 is closed by adjusting the switch 90, and then the air handling unit 10 is turned on to supply air to the air supply pipe 30. The air supply pipe 30 introduces air from the air supply port 70 at the top of the biological laboratory 100. After flowing in the biological laboratory 100, the air passes through the exhaust ports at the bottom of both sides of the biological laboratory 100 and enters the air outlet duct 40 and flows out. The gas entering the air outlet duct 40 flows to the exhaust pipe 60, and then flows from the exhaust pipe 60 to the exhaust unit 20. The adjustment switch 90 turns on the exhaust unit 20, and the exhaust unit 20 processes the gas flowing into the exhaust pipe 60 and discharges it to the outside, forming exhaust circulation.

[0052] The above working process can be switched between normal times and epidemic times, avoiding the sole use of circulating return air during an epidemic, which may endanger the personal safety of experimental personnel and may damage experimental samples.

[0053] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure.

[0054] As can be apparent to those skilled in the art, based on the technical solutions and concepts described above, various corresponding changes and modifications can be made, and all these changes and modifications shall fall within the protection scope of the present disclosure.

Claims

1. A switchable positive and negative pressure air conditioning device for return air and exhaust air treatment in a biological laboratory (100), characterized in that: It includes an air handling unit (10), an exhaust unit (20), an air supply pipe (30), an air outlet duct (40), a return air pipe (50) and an exhaust pipe (60); One end of the air handling unit (10) is connected to one end of the air supply main pipe (30), and the other end is connected to one end of the return air main pipe (50); One end of the air supply main (30) away from the air handling unit (10) is connected to the air supply port (70) at the top of the biological laboratory (100); The air outlet duct (40) has four ports, two of which are respectively connected to the exhaust ports at the bottom of both sides of the biological laboratory (100), and the other two ports are respectively connected to the return air main (50) and the exhaust air main (60), and a first valve (110) is provided at the connection point between the return air main (50) and the air outlet duct (40), and a second valve (120) is provided at the connection point between the exhaust air main (60) and the air outlet duct (40); One end of the return air main pipe (50) away from the air outlet duct (40) is in communication with the air handling unit (10), and one end of the exhaust air main pipe (60) away from the air outlet duct (40) is in communication with the exhaust unit (20); By opening the first valve (110) and closing the second valve (120), the air handling unit (10), the air supply main (30), the biological laboratory (100), the air outlet duct (40) and the return air main (50) are connected to form a circulating return air flow in a positive pressure operation; By opening the second valve (120) and closing the first valve (110), the air handling unit (10), the air supply main (30), the biological laboratory (100), the air outlet duct (40), the exhaust main (60) and the exhaust unit (20) are connected to form an exhaust flow with negative pressure operation.

2. The switchable positive and negative pressure air conditioning device according to claim 1 is characterized in that: A biological filtering device (80) is provided at the air outlet where the air outlet duct (40) communicates with the biological laboratory (100).

3. The switchable positive and negative pressure air conditioning device according to claim 2 is characterized in that: The biological filtering device (80) is provided with a filter element, and the filter element is detachably arranged in the biological filtering device (80).

4. The switchable positive and negative pressure air conditioning device according to claim 1 is characterized in that: The air supply ports (70) have at least three evenly spaced portions arranged on the top of the biological laboratory (100), and each of the air supply ports (70) is connected to the air supply main pipe (30).

5. The switchable positive and negative pressure air conditioning device according to claim 1 is characterized in that: The first valve (110) and the second valve (120) are both electric air valves.

6. The switchable positive and negative pressure air conditioning device according to claim 1 is characterized in that: It also includes a regulating switch (90), and the air handling unit (10), the exhaust unit (20), the first valve (110) and the second valve (120) are all electrically connected to the regulating switch (90).

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