CN111426022A

CN111426022A - Disinfection and sterilization device and disinfection and sterilization method for air conditioning unit

Info

Publication number: CN111426022A
Application number: CN202010255739.2A
Authority: CN
Inventors: 茅俊伟; 吕必金; 刘燕敏; 何焰; 陈尹
Original assignee: Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd; Tongji University; Shanghai Architectural Design and Research Institute Co Ltd
Current assignee: Climaveneta Chatunion Refrigeration Equipment Shanghai Co ltd; Tongji University; Shanghai Architectural Design and Research Institute Co Ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-07-17

Abstract

The invention discloses a disinfection and sterilization device of an air conditioning unit, which comprises: the device comprises a first disinfection air valve, a second disinfection air valve, a circulating air pipe, a VHP disinfection generator with a fan and a PTC electric auxiliary heating device. The invention also discloses a disinfection and sterilization method based on the disinfection and sterilization device. The invention utilizes the principle that VHP can generate a large amount of free hydroxyl and can directly attack cell components of microorganisms to kill the microorganisms, and can effectively disinfect fungi, bacteria, viruses and spores with similar cell structures. The invention can automatically and quickly sterilize on line by using the shutdown time, thereby saving a large amount of labor and time cost and improving the sterilization efficiency.

Description

Disinfection and sterilization device and disinfection and sterilization method for air conditioning unit

Technical Field

The invention relates to the technical field of disinfection and sterilization of air conditioning units.

Background

The main task of the civil building ventilation air conditioner is to ensure the indoor air quality, and the microbial pollution of the ventilation air conditioner unit can influence the health of indoor personnel. The operation and maintenance of the ventilation and air conditioning system are critical to controlling the microbial pollution of the air in the building. At present, the main disinfection and sterilization means of the ventilation air conditioning unit in the market are the following three:

the first is ultraviolet radiation, which is the most used one in the current air conditioning unit disinfection means. The device is simple and convenient, but the disinfection effect is limited, long-time irradiation is needed to effectively sterilize and disinfect, the voltage, the temperature, the humidity, the air dust content and the like can all affect the sterilization effect of ultraviolet radiation, and various functional section accessories arranged in the air conditioning unit can affect the ultraviolet radiation effect, so the method is only commonly used for surface disinfection of the coil pipe in the air conditioning unit.

The second is the application of electrical disinfection apparatus technology in ventilation air conditioning systems, but the united states Environmental Protection Agency (EPA) has objective assessments of this, and is not considered suitable for at least current uses. And two kinds of electric degassing unit that air conditioning unit was comparatively commonly used, electrostatic filter can produce ozone in the use, and nanometer light hydrogen ion purifier can make the efficiency of disinfecting greatly discount when there is the dust cover on the surface titanium dioxide layer. GB50333-2013 building technical Specification of clean surgical department in Hospital 8.3.5 clause: the final-stage purification facility can not generate harmful gas and substances, electromagnetic interference and microorganism mutation. This point can be used as reference for civil buildings.

Also, conventional cleaning and disinfection are used, and chemical disinfectants such as sodium hypochlorite, formaldehyde, ethylene oxide, and the like are commonly used. Although the disinfection effect is good, the air conditioning unit and the pipeline system thereof are damaged, exposure harm is caused to disinfection personnel, and personal protection is needed. And after disinfection, the air conditioning unit and the pipeline system thereof must be thoroughly cleaned and then dried to avoid chemical residue and the system being affected with damp and polluted. Generally, the whole disinfection and cleaning process is very complicated, troublesome and time-consuming, and the labor intensity of workers is high. The whole ventilation air-conditioning system needs to be stopped, and only can be used for seasonal periodic disinfection, so that the disinfection at any time according to needs is difficult to implement.

At present, the ventilation air conditioning unit on the market mainly depends on the three sterilization means, and no other more effective method exists. Any measure for controlling the microbial pollution in the civil building (especially in the air supply system) must not harm the indoor personnel to realize a comfortable and healthy environment. Although the three common methods have a certain effect on controlling the indoor microbial pollution of the civil buildings, the three common methods have respective disadvantages. In order to more effectively control indoor microbial contamination, it is necessary to develop an online operation sterilization technology of a ventilation air conditioning unit.

Disclosure of Invention

The invention aims to provide a disinfection and sterilization device and a disinfection and sterilization method of an air conditioning unit, which can realize online quick disinfection and sterilization, save labor and time and improve the disinfection and sterilization efficiency.

The technical scheme for realizing the purpose is as follows:

the utility model provides an air conditioning unit's disinfection and isolation device, air conditioning unit's air inlet side is provided with the air inlet valve, and the air supply side is provided with air supply valve and exhaust valve, and disinfection and isolation device includes:

the first disinfection air valve is arranged on the air inlet side of the air conditioning unit;

the second disinfection air valve is arranged on the air supply side of the air conditioning unit;

the circulating air pipe is communicated with the first sterilizing air valve and the second sterilizing air valve;

the VHP disinfection and sterilization generator is arranged at the middle section of the circulating air pipe and is provided with a fan; and

and the PTC electric auxiliary heating device is arranged in the circulating air pipe.

Preferably, the method further comprises the following steps: the VHP concentration monitoring device is arranged in the air conditioning unit.

Preferably, a temperature and humidity sensor is installed in the air conditioning unit.

Preferably, the temperature and humidity sensor is externally connected with the DDC controller.

The sterilization method of the above sterilization apparatus of the present invention includes:

step S1, closing the air inlet valve, the air supply valve and the air exhaust valve, and opening the first disinfection air valve and the second disinfection air valve;

step S2, adjusting the relative humidity in the air conditioning unit to a preset humidity value, and starting the VHP disinfection generator and a fan thereof;

step S3, when the concentration of VHP in the air conditioning unit reaches 100PPM, stopping the VHP disinfection generator from generating VHP gas, and continuously operating a fan of the VHP disinfection generator for a first preset time;

step S4, shutting down a fan of the VHP disinfection generator, and allowing the VHP gas in the air conditioning unit to stand still for a second preset time;

step S5, starting a fan of the VHP disinfection generator for a third preset time;

step S6, shutting down a fan of the VHP disinfection generator, opening an air inlet valve and an air outlet valve, and starting the fan in the air conditioning unit to exhaust VHP gas;

step S7, closing the first disinfection air valve, the second disinfection air valve and the exhaust valve; and opening the air inlet valve and the air supply valve.

Preferably, the method further comprises the following steps: and step S8, collecting and detecting the bacteria on the surface of the object in the air conditioning unit.

Preferably, when the moisture content in the air conditioning unit is greater than the preset moisture content value, the refrigeration coil of the air conditioning unit is opened until the moisture content is equal to the preset moisture content value, the refrigeration coil of the air conditioning unit is closed, and the heating coil of the air conditioning unit or the PTC electric auxiliary heating device is opened until the relative humidity reaches the preset humidity value;

and when the moisture content in the air conditioning unit is less than or equal to the preset moisture content value, starting a heating coil of the air conditioning unit or the PTC electric auxiliary heating device until the relative humidity reaches the preset humidity value.

Preferably, the predetermined humidity value is 40%; the first preset time is 10 minutes; the second preset time is 20 minutes; the third preset time is 90 minutes to 120 minutes.

The invention has the beneficial effects that: the invention utilizes low-concentration gaseous H₂O₂Can be sterilized at 4-80 deg.C, has stable performance and broad-spectrum bactericidal effect, and is suitable for sterilizing fungi, bacteria, viruses and spores. And little residue in the disinfection process (no need for cleaning after disinfection), gaseous H₂O₂After the disinfection is finished, the water vapor and the oxygen are automatically decomposed (no toxic by-products). Meanwhile, the arranged rapid sterilization circulating pipeline saves cost and is easy to verify the sterilization effect. Has better material compatibility (no damage to devices, electronic components and building materials). Since the air conditioning cabinet is generally placed between equipment or in an equipment interlayer, a great deal of labor and time are consumed to distinguish from the conventional disinfection and sterilization in the prior art. The invention can realize automatic on-line quick disinfection and sterilization by using the shutdown time, can save a large amount of manpower and time cost, and improves the disinfectionThe toxic sterilization efficiency is high.

Drawings

FIG. 1 is a block diagram of a sterilization apparatus for an air conditioning unit according to the present invention;

FIG. 2 is a flow chart of the sterilization process of the present invention.

Detailed Description

The invention will be further explained with reference to the drawings.

Referring to fig. 1, in the disinfection apparatus for an air conditioning unit according to the present invention, an air inlet valve 101 is disposed on an air inlet side of the air conditioning unit 100, and an air supply valve 102 and an air exhaust valve 103 are disposed on an air supply side. The disinfection and sterilization device comprises: a first disinfection air valve 1, a second disinfection air valve 2, a circulating air pipe 3, a VHP disinfection and sterilization generator 4, a PTC electric auxiliary heating device 5 and a VHP concentration monitoring device (not shown).

The first disinfection air valve 1 is arranged on the air inlet side of the air conditioning unit 100. The second sterilizing air valve 2 is arranged on the air supply side of the air conditioning unit 100. The circulating air pipe 3 is communicated with the first disinfection air valve 1 and the second disinfection air valve 2 and is an anti-corrosion pipeline. The VHP disinfection and sterilization generator 4 is arranged in the middle section of the circulating air pipe 3 and is provided with a fan. The PTC electric auxiliary heating device 5 is disposed inside the circulating air duct 3. The VHP concentration monitoring device is arranged in the air conditioning unit 100.

In addition, the invention also comprises a temperature and humidity sensor arranged in the air conditioning unit 100 and a matched DDC (direct digital control) control system. Whether the moisture content and the relative humidity in the unit meet the requirements required by disinfection is detected through a temperature and humidity sensor and a matched DDC control system, and if the moisture content and the relative humidity do not meet the requirements required by disinfection, the heat and humidity treatment equipment in the unit can be opened to adjust so as to achieve the conditions required by disinfection. Besides, the DDC control system can also provide BA or 485 communication interfaces and the like, and is connected with a building automatic control system to achieve the functions of remote control and automatic online disinfection.

Because the relative humidity of air has requirements in the VHP disinfection process, the required temperature and humidity can be achieved by utilizing heat and humidity treatment equipment in the four-pipe air treatment unit. In the two-pipe air conditioning unit, the coil pipe can only provide cold water in summer, and the relative humidity required by disinfection and sterilization can not be achieved by heating through the coil pipe after dehumidification. Therefore, a PTC electric auxiliary heating device 5 can be added in the system according to the requirement, and the system is reheated after dehumidification, so that the relative humidity is reduced, and an ideal sterilization temperature and humidity state point is achieved.

Referring to fig. 2, the sterilization method based on the above sterilization apparatus of the present invention includes the following steps:

and step S1, closing the air inlet valve 101, the air supply valve 102 and the air exhaust valve 103, and opening the first disinfection air valve 1 and the second disinfection air valve 2.

Step S2, the relative humidity in the air conditioning unit 100 is adjusted to a predetermined humidity value (40% in this embodiment), and the VHP disinfection generator 4 and its own fan are started to generate VHP gas. And starting the self-circulation mode in the air conditioning box.

The relative humidity is detected by a temperature and humidity sensor, and then the moisture content in the air is calculated by a DDC control system. As the VHP air conditioning unit has good adaptability to temperature and only has certain requirement on relative humidity, the aim is mainly to control the moisture content in the unit by the refrigeration coil. Generally, the following two cases are distinguished:

1) when the moisture content in the air conditioning unit 100 is greater than the predetermined moisture content value, the refrigeration coils of the air conditioning unit 100 are turned on until the moisture content is equal to the predetermined moisture content value (i.e., a steady state is reached: the air humidity in the unit reaches a state point required for disinfection, when the air humidity reaches a preset humidity value required for disinfection, the heating device is started to reduce the relative humidity), the refrigeration coil of the air conditioning unit 100 is closed, and the heating coil or the PTC electric auxiliary heating device 5 of the air conditioning unit 100 is started until the relative humidity reaches the preset humidity value. This is typically done during the summer season.

2) When the moisture content in the air conditioning unit 100 is less than or equal to the predetermined moisture content value, the heating coil or the PTC electric auxiliary device 5 of the air conditioning unit 100 is turned on until the relative humidity reaches the predetermined humidity value. This is typically done during the winter season. When the moisture content is higher in spring and autumn, the first disinfection process can be referred; if the moisture content is low, the second sterilization procedure may be referred to.

In the above sea area 10000CMH unit as an example, the air volume is about 1500CMH when the unit is self-circulated, and the internal circulation can be carried out by using a small air volume fan of the VHP disinfection generator 4. In summer, the self-circulation air volume of the unit is 1500CMH, and the cold and heat volumes are as follows (four pipe units can simultaneously supply cold and heat in summer; two pipe units only have cold water in summer, and the heat supply needs to be realized by a PTC electric auxiliary heat device 5 which is additionally arranged):

1) if the air conditioning unit is a fresh air conditioning unit, the summer inlet air temperature is 34.4/27.9 ℃, and the relative humidity is 61%; firstly, cooling and dehumidifying are carried out, the temperature is reduced to 18 ℃, the relative humidity is about 95%, and the cooling capacity is about 20 kW; the PTC electric auxiliary heating device 5 is then turned on (a four-tube system of machines can turn on the hot water coil), raising the temperature to 33 ℃, the relative humidity to 40%, and the heat requirement to about 8 kW.

2) If according to the return air conditioning unit, the inlet air temperature in summer is 27/19.5 ℃ as an example, and the relative humidity is 50 percent; the air return unit can be directly heated to reduce the relative humidity due to lower temperature; the PTC electric auxiliary heating device 5 is directly started (a four-pipe making unit can start a hot water coil), the temperature is raised to 31 ℃, the relative humidity is 40 percent, and the heat is required to be about 2 kW; (heat may be appropriately reserved to prevent the return air from being relatively high in humidity).

Under the working condition in winter, the self-circulation air volume of the unit is 1500CMH, and the heat quantity is as follows (because the moisture content in the air in winter is lower, the relative humidity can be reduced by directly heating):

1) if the air conditioning unit is a full fresh air conditioning unit, the inlet air temperature in winter is-2.2/-3.4 ℃ as an example, and the relative humidity is 76%; the PTC electric auxiliary heating device 5 (or hot water coil) is directly turned on to raise the temperature to 7 ℃, the relative humidity is 40%, and the heat is about 5 kW.

2) If according to the return air conditioning unit, the inlet air temperature in winter is 21/14.6 ℃ as an example, and the relative humidity is 50 percent; directly starting the PTC electric auxiliary heating device 5 (or a hot water coil), raising the temperature to 25 ℃, and increasing the relative humidity to 40 percent, wherein the heat is about 2 kW; (heat may be appropriately reserved to prevent the return air from being relatively high in humidity).

Step S3, when the VHP concentration in the air conditioner set 100 reaches 100PPM, the VHP disinfection generator 4 is stopped generating VHP gasThe fan of the VHP sanitizer generator 4 is continuously operated for a first preset time (10 minutes in this example). Using low-concentration gaseous H₂O₂The principle that a large amount of free hydroxyl groups can be generated and cell components (including lipids, proteins and DNA) of microorganisms can be directly attacked to be killed can effectively disinfect fungi, bacteria, viruses and spores with similar cell structures. It is harmless to human exposure, and can be used for most materials and even sensitive electronic devices. These properties make VHP a relatively ideal sterilant.

Step S4, the blower of the VHP disinfection and sterilization generator 4 is turned off, and the VHP gas in the air conditioning unit 100 is stationary for a second preset time (20 minutes in this embodiment).

Step S5, the blower of the VHP disinfection and sterilization generator 4 is turned on for a third preset time (90 minutes to 120 minutes), so that the VHP self-circulation process is repeated for 90 minutes to 120 minutes to achieve the disinfection and sterilization effect.

And step S6, shutting down the fan of the VHP disinfection and sterilization generator 4, opening the air inlet valve 101 and the air outlet valve 103, starting the fan in the air conditioning unit 100 and running for half an hour at low frequency to exhaust VHP gas.

Step S7, the first sterilizing air flap 1, the second sterilizing air flap 2 and the air exhaust valve 103 are closed. The inlet valve 101 and the supply valve 102 are opened. And (5) the machine set enters a normal standby state, and the disinfection and sterilization process is finished.

Step S8, after the disinfection, opening the access door of the air conditioning unit 100, using ATP (adenosine triphosphate is formed by connecting adenine, ribose and 3 phosphate groups, releases more energy during hydrolysis, and is the most direct energy source in the organism. the ATP swab uses ATP to react with luciferin-luciferase to generate photons, under the condition of excessive luciferin and luciferase, the quantity of the photons is positively correlated with the quantity of ATP, and is in an absolute linear relation in a certain range, the quantity of the photons can be calculated by using a luminometer to detect the light value of the ATP, thereby calculating the quantity of the microorganisms, obtaining the pollution degree of the detected object), quickly detecting the swab to collect the object surface bacteria in the air conditioning box, placing the swab in a fluoroscope, reading out the bacterial colony number after 10 seconds, the removal rate of natural bacteria is more than 90%, the total number of bacteria and fungi on the inner surface of the box body is less than 100CFU/m2, and pathogenic microorganisms cannot be detected.

The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.

Claims

1. The utility model provides an air conditioning unit's disinfection and isolation device, air conditioning unit's air inlet side is provided with the air inlet valve, and the air supply side is provided with air supply valve and exhaust valve, and its characterized in that, disinfection and isolation device includes:

2. A sterilization apparatus for an air conditioning unit according to claim 1, further comprising: the VHP concentration monitoring device is arranged in the air conditioning unit.

3. A disinfecting and sterilizing apparatus for an air conditioning unit as recited in claim 1, characterized in that a temperature and humidity sensor is installed in said air conditioning unit.

4. A sterilizer of an air conditioning unit according to claim 3, wherein the temperature and humidity sensor is externally connected to the DDC controller.

5. A sterilization method based on the sterilization apparatus according to claim 1, comprising:

6. The sterilization method according to claim 5, further comprising: and step S8, collecting and detecting the bacteria on the surface of the object in the air conditioning unit.

7. The sterilization method according to claim 5, wherein in the step S2,

when the moisture content in the air conditioning unit is greater than the preset moisture content value, starting a refrigeration coil of the air conditioning unit until the moisture content is equal to the preset moisture content value, closing the refrigeration coil of the air conditioning unit, and starting a heating coil of the air conditioning unit or the PTC electric auxiliary heating device until the relative humidity reaches the preset humidity value;

8. A sterilisation method according to claim 5, characterised in that the predetermined humidity value is 40%; the first preset time is 10 minutes; the second preset time is 20 minutes; the third preset time is 90 minutes to 120 minutes.