A fast-conversion air conditioning system

Abstract

The present invention provides an air conditioning system that can be quickly switched, and the ward is divided into a clean area, a semi-contaminated area and a contaminated area, including an indoor circulating air conditioning terminal, a first fresh air system, a second fresh air system and a third fresh air system. The clean area, the semi-contaminated area and the contaminated area are respectively provided with indoor circulating air conditioning terminals, the first fresh air system, the second fresh air system and the third fresh air system are respectively provided in the clean area, the semi-contaminated area and the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipe; in normal times, the indoor circulating air conditioning terminals are all enabled, the first fresh air system is enabled, any one of the second fresh air system and the third fresh air system is enabled, and the connecting pipe is connected; in the event of an epidemic, the indoor circulating air conditioning terminals are all disabled, the first fresh air system, the second fresh air system and the third fresh air system are enabled at the same time, and the connecting pipe is disconnected. By reasonably dividing the air conditioning system and switching the connecting pipe, the rapid switching of the air conditioning system is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning systems, and in particular to an air conditioning system capable of rapid conversion. Background Art

[0002] At present, negative pressure isolation wards are very limited in my country and even in the world, and there are many areas that do not have negative pressure wards that meet the standards and specifications. In response to sudden outbreaks, it is difficult and expensive to temporarily build new infectious disease wards or renovate existing buildings, which wastes resources seriously. In addition, passive response in an emergency will inevitably lead to various imperfect problems.

[0003] How to establish an air-conditioning system that can be quickly switched is of great prevention and control significance. Summary of the invention

[0004] The purpose of the present invention is to provide an air-conditioning system that can be quickly converted. It can be operated as an ordinary ward at ordinary times to meet the low energy consumption of ordinary wards. When an epidemic breaks out, it can be converted into a negative pressure isolation ward in a short time to meet the process requirements of negative pressure wards.

[0005] In order to achieve the above-mentioned object, the present invention provides an air-conditioning system capable of rapid conversion, wherein the ward is divided into a clean area, a semi-contaminated area and a contaminated area, and comprises an indoor circulation air-conditioning terminal, a first fresh air system, a second fresh air system and a third fresh air system, wherein the clean area, the semi-contaminated area and the contaminated area are respectively provided with the indoor circulation air-conditioning terminal, the first fresh air system, the second fresh air system and the third fresh air system are respectively provided in the clean area, the semi-contaminated area and the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipe;

[0006] In normal times, the indoor circulation air conditioning terminals of the clean area, the semi-contaminated area and the contaminated area are all enabled, the first fresh air system is enabled, any one of the second fresh air system and the third fresh air system is enabled, and the connecting pipeline is connected;

[0007] During an epidemic, the indoor circulation air-conditioning terminals in the clean area, semi-contaminated area and the contaminated area are all disabled, the first fresh air system, the second fresh air system and the third fresh air system are enabled at the same time, and the connecting pipeline is disconnected.

[0008] Optionally, the contaminated area includes a ward contaminated area and a corridor contaminated area, and both the ward contaminated area and the corridor contaminated area are provided with the indoor circulation air-conditioning terminal and the third fresh air system.

[0009] Optionally, the first fresh air system, the second fresh air system and the third fresh air system all include a fresh air unit and an exhaust air unit, and the fresh air units of different fresh air systems are independent of each other, and the exhaust air units of different fresh air systems are independent of each other, and the fresh air unit of the second fresh air system is connected to the fresh air unit of the third fresh air system through the connecting pipeline.

[0010] Optionally, the connecting pipeline is provided with an electric sealing valve for controlling the conduction and disconnection of the connecting pipeline.

[0011] Optionally, the exhaust fan unit includes two variable frequency exhaust fans running in parallel. In normal times, any one exhaust fan in the exhaust fan unit is running, and during an epidemic, the two exhaust fans of the exhaust fan unit are running at the same time.

[0012] Optionally, the fans in the fresh air unit and the exhaust air unit are both variable frequency set.

[0013] Optionally, the operating frequency of the fresh air unit is adapted to the operating frequency of the exhaust air unit.

[0014] Optionally, the rapidly convertible air-conditioning system also includes a zero-leakage and high-efficiency exhaust device disposed at the lower exhaust vent of the ward and the exhaust vent of the bathroom. During an epidemic, the indoor air is discharged into the main exhaust duct by the zero-leakage and high-efficiency exhaust device through the terminal sealed fan, and then discharged by the exhaust unit on the roof.

[0015] Optionally, the second fresh air system and the third fresh air system both adopt a DC fresh air system.

[0016] Optionally, the indoor circulation air-conditioning terminal is a fan coil or a multi-split indoor unit, and the indoor circulation air-conditioning terminal is covered by a closed cover when not in use, and the air supply and return air outlets of the indoor circulation air-conditioning terminal are sealed to ensure a closed indoor environment.

[0017] In the rapidly convertible air-conditioning system provided by the present invention, by reasonably dividing the air-conditioning system and switching connecting pipes, the system can be operated as an ordinary ward at ordinary times to meet the low energy consumption of ordinary wards. When an epidemic breaks out, the system can be converted into a negative pressure isolation ward in a short time to meet the process requirements of negative pressure wards, so as to make up for the shortage of negative pressure isolation wards in various regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an air conditioning system capable of rapid conversion provided by an embodiment of the present invention;

[0019] In the attached figure:

[0020] 10-indoor circulation air conditioning terminal; 21-first fresh air unit; 22-second fresh air unit; 23-third fresh air unit; 24-fourth fresh air unit; 31-first exhaust fan unit; 32-second exhaust fan unit; 33-third exhaust fan unit; 34-fourth exhaust fan unit; 40-connecting pipeline; 50-sealed valve; 60-zero leakage high-efficiency exhaust device; 70-terminal sealed fan;

[0021] A-clean area; B-semi-contaminated area; C-contaminated ward area; D-contaminated corridor area. DETAILED DESCRIPTION

[0022] The core idea of ​​the present invention is to provide an air-conditioning system that can be quickly switched, and the ward is divided into a clean area, a semi-contaminated area and a contaminated area. The air-conditioning system that can be quickly switched includes an indoor circulation air-conditioning terminal, a first fresh air system, a second fresh air system and a third fresh air system. The clean area, the semi-contaminated area and the contaminated area are respectively provided with the indoor circulation air-conditioning terminal, the first fresh air system, the second fresh air system and the third fresh air system are respectively provided in the clean area, the semi-contaminated area and the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipeline;

[0023] In normal times, the indoor circulation air conditioning terminals of the clean area, the semi-contaminated area and the contaminated area are all enabled, the first fresh air system is enabled, any one of the second fresh air system and the third fresh air system is enabled, and the connecting pipeline is connected;

[0024] During an epidemic, the indoor circulation air-conditioning terminals in the clean area, semi-contaminated area and the contaminated area are all disabled, the first fresh air system, the second fresh air system and the third fresh air system are enabled at the same time, and the connecting pipeline is disconnected.

[0025] By reasonably dividing the air-conditioning system and switching connecting pipes, it can be operated as a general ward at ordinary times to meet the low energy consumption of general wards. When an epidemic breaks out, it can be converted into a negative pressure isolation ward in a short time to meet the technological requirements of negative pressure wards, so as to make up for the shortage of negative pressure isolation wards in various regions.

[0026] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0027] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, unless the content clearly indicates otherwise. As used in the present invention, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. As used in the present invention, the term "several" is generally used in a sense that includes "at least one", unless the content clearly indicates otherwise. As used in the present invention, the term "at least two" is generally used in a sense that includes "two or more", unless the content clearly indicates otherwise. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features.

[0028] Please refer to Figure 1 , Figure 1 A schematic diagram of an air-conditioning system capable of rapid conversion provided by an embodiment of the present invention. This embodiment provides an air-conditioning system capable of rapid conversion, wherein the ward is divided into a clean area A, a semi-contaminated area B and a contaminated area, and comprises an indoor circulation air-conditioning terminal 10, a first fresh air system, a second fresh air system and a third fresh air system. The clean area A, the semi-contaminated area B and the contaminated area are respectively provided with the indoor circulation air-conditioning terminal 10, the first fresh air system, the second fresh air system and the third fresh air system are respectively provided in the clean area A, the semi-contaminated area B and the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipe 40;

[0029] In normal times, the indoor circulation air conditioning terminals 10 of the clean area A, the semi-contaminated area B and the contaminated area are all enabled, the first fresh air system is enabled, any one of the second fresh air system and the third fresh air system is enabled, and the connecting pipe 40 is connected;

[0030] During an epidemic, the indoor circulation air-conditioning terminals 10 in the clean area A, the semi-contaminated area B and the contaminated area are all disabled, the first fresh air system, the second fresh air system and the third fresh air system are enabled at the same time, and the connecting pipe 40 is disconnected.

[0031] Specifically, the prerequisite for setting up the air-conditioning system that can be quickly converted is that the air-conditioning system is suitable for newly built wards of relevant hospitals for the purpose of conversion from normal to epidemic situation, and is designed and constructed in accordance with the process requirements of negative pressure isolation wards. The building must be arranged in the form of three zones and two channels of a standard isolation ward, and the interior must be installed in accordance with the airtightness requirements of a standard isolation ward.

[0032] Furthermore, the contaminated area includes a ward contaminated area C and a corridor contaminated area D, and both the ward contaminated area C and the corridor contaminated area D are provided with the indoor circulation air-conditioning terminal 10 and the third fresh air system, and the third fresh air system of the ward contaminated area C and the third fresh air system of the corridor contaminated area D are independent of each other.

[0033] Furthermore, the first fresh air system, the second fresh air system and the third fresh air system all include a fresh air unit and an exhaust air unit, and the fresh air units of different fresh air systems are independent of each other, and the exhaust air units of different fresh air systems are independent of each other, and the fresh air unit of the second fresh air system is connected to the fresh air unit of the third fresh air system through the connecting pipe 40. In this embodiment, the fresh air unit and the exhaust air unit in the ward contaminated area C are independent of the fresh air unit and the exhaust air unit in the corridor contaminated area D, and are respectively connected through the connecting pipe 40. In this embodiment, please combine Figure 1 The first fresh air system includes a first fresh air unit 21 and a first exhaust air unit 31, the second fresh air system includes a second fresh air unit 22 and a second exhaust air unit 32, the third fresh air system of the ward contaminated area C includes a third fresh air unit 23 and a third exhaust air unit 33, the third fresh air system of the corridor contaminated area D includes a fourth fresh air unit 24 and a fourth exhaust air unit 34, the second fresh air unit 22, the third fresh air unit 23 and the fourth fresh air unit 24 are connected through the connecting pipe 40. Under normal circumstances, you only need to start any one group of fresh air units as the fresh air supply system for the entire ward.

[0034] The connecting pipe 40 is provided with an electric airtight valve 50 for controlling the connection and disconnection of the connecting pipe 40. Since the fresh air volume and exhaust air volume of the air conditioning system are only 30%-40% of the total fresh exhaust air volume during the epidemic, by reasonably dividing the fresh air system and the exhaust air system, a fresh air system in the semi-polluted and polluted areas during the epidemic can be used as the fresh air supply system for the entire ward during normal times. The fresh air system realizes the normal-epidemic conversion of the entire air conditioning system by opening and closing the connecting pipe 40 and the electric airtight valve 50.

[0035] Preferably, the exhaust fan unit includes two variable frequency exhaust fans running in parallel. In normal times, any one of the exhaust fans in the exhaust fan unit can be operated. In the event of an epidemic, the two exhaust fans in the exhaust fan unit can be operated simultaneously. The exhaust volume of the exhaust fan unit corresponds to the discharge volume of the fresh air unit. In normal times, the demand for fresh air and exhaust air is relatively small, so only one exhaust fan is required to operate. Of course, this application does not limit the number of exhaust fans in the exhaust fan unit, and it can be selected according to the demand for fresh air volume.

[0036] The fans in the fresh air unit and the exhaust air unit are all variable frequency settings. In this embodiment, the fans in the fresh air unit and the exhaust air unit are all variable frequency fans to meet the needs of different air volumes during normal times and epidemic periods, while reducing the energy consumption of the air conditioning system.

[0037] Preferably, the operating frequency of the fresh air unit is adapted to the operating frequency of the exhaust air unit, that is, when the fresh air unit operates with variable frequency, the exhaust air unit also operates with variable frequency to meet the requirement of indoor supply and exhaust air balance.

[0038] In addition, it should be noted that the matching of the supply and exhaust fans of the air conditioning system capable of rapid conversion provided by this embodiment is not necessarily achieved by frequency conversion, but can also be achieved by matching the different air volumes generated by different combinations of rooms in the system. Also, the fan used at ordinary times can select the fan with the closest parameters to the fan used during the epidemic as the main fan, which is achieved by connecting the pipeline 40 and switching the electric sealing valve 50.

[0039] In this embodiment, the air conditioning system capable of rapid conversion further includes a zero-leakage high-efficiency exhaust device 60 arranged at the lower exhaust port of the ward and the exhaust port of the bathroom. During an epidemic, the indoor air is discharged from the zero-leakage high-efficiency exhaust device 60 into the main exhaust duct through the terminal sealed fan 70, and then discharged by the exhaust unit on the roof. The terminal sealed fan 70 is mainly used to provide continuous exhaust power to ensure the negative pressure environment of the isolation ward. Usually, the ward exhaust system opens the sealed valve 50 arranged on the bypass exhaust pipe of the ward, closes the terminal sealed fan 70 and the sealed valve 50 at the entrance of the terminal sealed fan 70, so that the ward exhaust is only discharged into the exhaust main duct through the bathroom exhaust port, and then discharged through the roof single fan. The floor-standing high-efficiency filter device and the exhaust riser of the ward are all removed, and the riser is removed to the ceiling, and a sealing plate is installed at the ceiling. The high-efficiency filter exhaust ports at the top of the room are all replaced with ordinary exhaust ports. Since the size of the ordinary exhaust port is smaller than that of the high-efficiency filter device, a sealing plate can be installed around the ordinary exhaust port.

[0040] The indoor circulation air conditioning terminal 10 installed in the room, such as a fan coil unit or a multi-split indoor unit, can be covered by a sealed cover when not in use, and the supply and return air outlets of the indoor circulation air conditioning terminal 10 should be sealed to ensure a closed indoor environment. The indoor circulation air conditioning terminal 10 needs to be activated at ordinary times, and the sealing plate at the supply and return air outlets of the indoor circulation air conditioning terminal 10 is removed, and a conventional supply air outlet (diffuser) and a return air outlet that meets the requirements of the "General Hospital Building Design Code" GB51039 can be installed.

[0041] Preferably, the second fresh air system and the third fresh air system both adopt a direct current fresh air system. By adopting a direct current fresh air system, each area can achieve negative pressure control during an epidemic, meeting the process requirements of the isolation ward for pressure gradient.

[0042] In this embodiment, the indoor circulation air-conditioning terminal 10 is a fan coil unit or a multi-split indoor unit, and each indoor circulation air-conditioning terminal 10 is independent of each other.

[0043] Next, taking a hospital in Shanghai as an example, the air-conditioning system that can be quickly converted is introduced through a specific embodiment. The hospital usually serves as a regional community health service center. During an epidemic, it needs to be quickly converted into an isolation ward that can treat confirmed cases of respiratory infectious diseases. The ward with a complete standard ward floor is used as an example.

[0044] Standard negative pressure isolation three-zone two-channel wards must strictly follow the requirements of "Infectious Disease Hospital Architectural Design Code" GB50849 and "Hospital Negative Pressure Isolation Ward Environmental Control Requirements" GB-T35428. Semi-contaminated area B and contaminated area must be equipped with independent fresh air systems, and the air conditioning fresh and exhaust ventilation frequency is large;

[0045] The clean area is equipped with a conventional air-conditioning system, an indoor circulation air-conditioning terminal 10 (fan coil units, multi-split indoor units, etc.) plus a fresh air system. The fresh air system operates normally both in normal times and during epidemics.

[0046] An independent direct-current fresh air system (10 times / h) with variable frequency fan is set in the semi-polluted area;

[0047] An independent DC fresh air system (10 times / h) with variable frequency fan is installed in the contaminated area of ​​the ward;

[0048] An independent DC fresh air system (10 times / h) with a variable frequency fan is set in the contaminated area of ​​the corridor.

[0049] During the epidemic, the semi-contaminated area and contaminated area are considered as a whole ward in normal times, and the air conditioning system is set up as a conventional air conditioning system, such as indoor circulation air conditioning terminal (fan coil, multi-split indoor unit, etc.) plus fresh air system. The fresh air volume of the ward in normal times only needs to meet the requirements of the "General Hospital Building Design Code" GB51039-2014, 40m per person. 3 / h or 2 times / h, whichever is greater. The fresh air volume is greatly reduced compared to that during the epidemic (10 times / h during the epidemic). The fresh air can be supplied by one fresh air unit during the epidemic by switching the air ducts. Through appropriate frequency conversion control, the fresh air supply of the entire ward can be met.

[0050] The exhaust system division form corresponds to the fresh air system one by one. The exhaust systems in semi-polluted areas and polluted areas are equipped with dual fans in parallel (each fan 6 times / h). The fan frequency conversion setting can realize the operation of only a single fan in normal times. Through the fan frequency conversion control, the exhaust duct system is opened and closed through the connecting air duct and the electric sealing valve to match the normal fresh and exhaust air volume balance, thereby realizing the normal and epidemic conversion of the exhaust system.

[0051] Specifically, the corresponding relationship between the semi-contaminated and contaminated areas during the epidemic and the normal inpatient wards, and the division and form of the air-conditioning system are shown in Table 1:

[0052]

[0053] Table 1

[0054] The air-conditioning system of the clean area during the epidemic in Table 1 is the air-conditioning system of the auxiliary office area under normal circumstances. Both are conventional air-conditioning systems and no conversion is required.

[0055]

[0056]

[0057] Table 2

[0058] As shown in Table 2, the matching situation of the fresh air system during the epidemic in this case project is compared with the normal fresh air system. From Table 2, it can be seen that during the epidemic, the fresh air volume in the semi-contaminated area, the ward contaminated area and the corridor contaminated area is 3840m 3 / h,1950m 3 / h,3600m 3 / h. After the three zones are combined into one air conditioning system, the fresh air demand in the ward is 1440m 3 / h, the fresh air demand for other corridors and auxiliary rooms is 1488m 3 / h, the total fresh air demand is 2928m 3 / h.

[0059] In this embodiment, the indoor circulation air-conditioning terminal in the room, such as the fan coil unit (multi-split indoor unit, split air conditioner), is not used during the epidemic, and its supply and return air vents are sealed with decorative panels. The sealing panels are replaced with corresponding supply and return air vents at ordinary times.

[0060] Based on this, the present application also provides a normal-to-epidemic conversion process for an air-conditioning system, which is as follows:

[0061] Prerequisites: The system is suitable for newly built hospital wards with the purpose of conversion from normal to epidemic situation. It is designed and constructed in accordance with the process requirements of negative pressure isolation wards. The building needs to be arranged in the form of three zones and two channels of standard isolation wards, and the interior decoration must be installed in accordance with the airtightness requirements of standard isolation wards.

[0062] Air conditioning system design: The air conditioning system is divided according to the air conditioning system during the epidemic. The system air volume needs to be matched according to the air volume during the epidemic and at normal times to ensure that the ventilation and exhaust systems can meet the epidemic conditions at the same time through switching and variable frequency operation; configure relevant ventilation and exhaust fan units, and when setting up the ventilation and exhaust system air ducts, the relevant communication switching air ducts and electric sealing valves need to be in place; reserve a high-efficiency exhaust device installation position in the room (the ward also needs to reserve a high-efficiency lower exhaust port position); the indoor circulation air conditioning terminal is installed in place; and the room pressure difference control system is installed in place.

[0063] After the system is installed and put into use, if you need to switch the air conditioning system during the epidemic:

[0064] 1) Remove the common exhaust vents in semi-contaminated areas and contaminated areas and replace them with zero-leakage high-efficiency exhaust devices;

[0065] 2) The return air vents of the indoor circulation air conditioner terminal (fan coil, indoor multi-split unit, etc.) in the room are removed and sealed with a sealing plate;

[0066] 3) Install a zero-leakage and high-efficiency exhaust device at the lower part of the reserved position in the ward;

[0067] 4) After disinfection and cleaning of the fresh air system, open and close the corresponding switch closed valves to make the fresh air unit operate independently in strict accordance with the semi-contaminated area and contaminated area, and the fan frequency conversion matches the air volume;

[0068] 5) After the exhaust system is disinfected and cleaned, open and close the corresponding switch closed valve, turn on the parallel fan, and make the exhaust fan unit correspond to the fresh air system and operate independently in strict accordance with the semi-contaminated area and contaminated area, and the fan frequency conversion matches the air volume;

[0069] 6) The room pressure difference control system is activated and the supply and exhaust air system is debugged. It can be put into use after meeting the relevant process requirements of the air conditioning in the isolation ward (temperature, humidity, pressure gradient, etc.).

[0070] The peacetime-epidemic conversion air-conditioning system provided in this embodiment is an air-conditioning system that meets the process requirements of isolation wards and can be put into use in the early stage of an epidemic through a small amount of construction, installation and debugging (about one week). When used in normal times, it increases the utilization rate of the ward and reduces the energy consumption of the air-conditioning system.

[0071] In summary, an embodiment of the present invention provides an air-conditioning system that can be quickly switched, and the ward is divided into a clean area, a semi-contaminated area and a contaminated area, including: a first air-conditioning system, including an indoor circulating air-conditioning terminal and a first fresh air system arranged in the clean area; a second air-conditioning system, including an indoor circulating air-conditioning terminal, a second fresh air system and a third fresh air system, the indoor circulating air-conditioning terminal is arranged in the semi-contaminated area and the contaminated area, the second fresh air system is arranged in the semi-contaminated area, and the third fresh air system is arranged in the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipe; in normal times, the indoor circulating air-conditioning terminal and the indoor circulating air-conditioning terminal are both activated, the first fresh air system is activated, and any one of the second fresh air system and the third fresh air system is activated, and the connecting pipe is connected; during an epidemic, the indoor circulating air-conditioning terminal and the indoor circulating air-conditioning terminal are both deactivated, the first fresh air system, the second fresh air system and the third fresh air system are activated at the same time, and the connecting pipe is disconnected. By reasonably dividing the air-conditioning system and switching connecting pipes, it can be operated as a general ward at ordinary times to meet the low energy consumption of general wards. When an epidemic breaks out, it can be converted into a negative pressure isolation ward in a short time to meet the technological requirements of negative pressure wards, so as to make up for the shortage of negative pressure isolation wards in various regions.

[0072] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. An air conditioning system capable of rapid conversion, which divides the ward into a clean area, a semi-contaminated area and a contaminated area, characterized in that: It includes an indoor circulation air-conditioning terminal, a first fresh air system, a second fresh air system and a third fresh air system, the clean area, the semi-contaminated area and the contaminated area are respectively provided with the indoor circulation air-conditioning terminal, the first fresh air system, the second fresh air system and the third fresh air system are respectively provided in the clean area, the semi-contaminated area and the contaminated area, and the second fresh air system and the third fresh air system are connected through a connecting pipeline; wherein, the first fresh air system, the second fresh air system and the third fresh air system all include a fresh air unit and an exhaust air unit, and the fresh air units of different fresh air systems are independent of each other, and the exhaust air units of different fresh air systems are independent of each other, the fresh air unit of the second fresh air system is connected with the fresh air unit of the third fresh air system through the connecting pipeline, the indoor circulation air-conditioning terminal is a fan coil unit or a multi-split indoor unit, and the indoor circulation air-conditioning terminal is covered by a closed cover when not in use, and the air supply port and the return air port of the indoor circulation air-conditioning terminal are closed to ensure a closed indoor environment; In normal times, the indoor circulation air conditioning terminals of the clean area, the semi-contaminated area and the contaminated area are all enabled, the first fresh air system is enabled, any one of the second fresh air system and the third fresh air system is enabled, and the connecting pipeline is connected; During an epidemic, the indoor circulation air-conditioning terminals in the clean area, semi-contaminated area and the contaminated area are all disabled, the first fresh air system, the second fresh air system and the third fresh air system are enabled at the same time, and the connecting pipeline is disconnected.

2. A rapidly convertible air conditioning system as claimed in claim 1, characterized in that: The contaminated area includes a ward contaminated area and a corridor contaminated area. Both the ward contaminated area and the corridor contaminated area are provided with the indoor circulation air conditioning terminal and the third fresh air system, and the third fresh air systems of the ward contaminated area and the corridor contaminated area are independent of each other.

3. The air conditioning system capable of rapid conversion according to claim 1, characterized in that: The communicating pipeline is provided with an electric sealing valve for controlling the connection and disconnection of the communicating pipeline.

4. The air conditioning system capable of rapid conversion according to claim 1, characterized in that: The exhaust fan unit includes two exhaust fans running in parallel. In normal times, any one exhaust fan in the exhaust fan unit is running. During an epidemic, the two exhaust fans of the exhaust fan unit are running at the same time.

5. The air conditioning system capable of rapid conversion according to claim 1, characterized in that: The fans in the fresh air unit and the exhaust air unit are all variable frequency set.

6. A rapidly switchable air conditioning system as claimed in claim 5, characterized in that: The operating frequency of the fresh air unit is adapted to the operating frequency of the exhaust air unit.

7. The air conditioning system capable of rapid conversion according to claim 1, characterized in that: The rapidly convertible air conditioning system also includes a zero-leakage, high-efficiency exhaust device disposed at the lower exhaust vents of the ward and the exhaust vents of the bathroom. During an epidemic, the indoor air is discharged from the zero-leakage, high-efficiency exhaust device into the main exhaust duct through the terminal sealed fan, and then discharged by the exhaust unit on the roof.

8. A rapidly switchable air conditioning system as claimed in claim 1 or 2, characterized in that: The second fresh air system and the third fresh air system both adopt DC fresh air systems.

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