JP4359758B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system, and more particularly to an air conditioning system that reduces airborne bacteria and adherent bacteria existing indoors in food or pharmaceutical facilities or hospitals that are required to be hygienic.

  In hygienic facilities such as food and pharmaceutical factories and hospitals, there is a possibility of invading the room as people and things come in and out as airborne bacteria and adherent bacteria. There was a problem that the room was contaminated by adhering to the apparatus and growing. If there is indoor contamination, the quality of the product deteriorates, and in the case of food, it causes food poisoning.

  Conventionally, as a countermeasure for this problem, many methods have been adopted in which circulating air and outside air are filtered through a filter and then blown into the room. In addition, a method of sterilizing the room with a sterilizer using ultraviolet rays or ozone in an unmanned state, a method of sterilizing circulating air and outside air flowing through the duct by installing the sterilizer in the duct, and the like are also used. On the other hand, a method of applying an antibacterial agent such as titanium oxide indoors is used as a method for suppressing the growth of the attached bacteria attached to the room.

In patent document 1, the automatic sterilization apparatus of the domestic air conditioning equipment which sprays the chemical | medical solution used for a food additive in the room | chamber interior and air conditioning equipment is disclosed. As a result, microorganisms such as fungi, viruses and bacteria can be reduced without causing harm to the human body.
Japanese Patent Laid-Open No. 11-159787

  However, in the conventional method of sterilizing using a filter, it is necessary to replace an expensive filter at a high frequency in order to increase the sterilization rate, and the blast power is increased to reduce pressure loss due to the filter. There is a problem that the equipment cost and the running cost increase. In addition, the indoor sterilization method using ultraviolet rays and ozone generation cannot be used in the presence of humans, and it cannot treat microorganisms from dust brought in by humans. Is impossible. As for hospitals, in order to remove airborne bacteria, the number of indoor ventilation is required, but this leads to an increase in operating costs. Furthermore, in the conventional method of installing a sterilizer in a duct, the air flowing in the duct is fast and it is difficult to sterilize all the floating bacteria.

  Moreover, since the automatic sterilization apparatus of patent document 1 is for home use, and the food additive used as a chemical solution has low antibacterial activity, the hygienic facilities such as food and pharmaceutical factories and hospitals can be used only with the automatic sterilization apparatus. It is very difficult to keep it hygienic.

  This invention is made | formed in view of such a situation, and it aims at providing the air-conditioning system which can reduce effectively the airborne microbe and adherent microbe which penetrate | invaded through the person and the thing.

For a first aspect of the present invention to achieve the above object, a circulation system for circulating indoor air, and ventilation system for ventilating the indoor air, provided in the circulation system and ventilation system be less, the An air-conditioning system comprising microorganism reducing means for reducing microorganisms present in indoor air, wherein the circulation system and the ventilation system are respectively formed at an upper position and a lower position in the indoor space, An up-flow operation mode in which air is supplied into the room from the air supply / exhaust port at the upper position and exhausted from the air supply / exhaust port at the upper position, and air is supplied into the room from the air supply / exhaust port at the upper position. An operation switching means for switching between a downward flow operation mode exhausted from an exhaust port is provided, and an ultraviolet irradiation device that irradiates ultraviolet rays in the air flow of the upward flow operation mode as an antimicrobial agent as the microorganism reduction means A first microorganism reducing means arranged on the upstream side of the antibacterial agent spraying device to be sprayed; and a second microorganism arranging the ultraviolet irradiation device on the upstream side of the antibacterial agent jetting device in the air flow in the downward flow operation mode. The operation switching means drives only the first microorganism reduction means in the upward flow operation mode, and the second switching means in the downward flow operation mode. Only the microorganism reducing means is driven.

According to claim 1 , when the operation switching means is switched to the upward flow operation mode, an upward flow is generated in the room, and the first and second microorganism reducing means provided in the circulation system and the ventilation system, respectively. Of these, only the first microorganism reducing means is driven. Due to this upward flow, the floating bacteria are sucked from the upper air supply / exhaust port without falling and adhering to the floor and walls, and the attached bacteria already attached to the floor and walls are peeled off and become upward flow. It is sucked together from the upper air supply / exhaust port and sterilized by the ultraviolet irradiation device, so that adherent bacteria in the room can be rapidly reduced. Moreover, since the air supplied from the circulation system and the ventilation system contains an antibacterial agent, the antibacterial agent can be sprayed into the room and the room can be maintained in an antibacterial atmosphere, so that adherent bacteria in the room can be reduced. In this case, since only the first microorganism reducing means is driven, the order of spraying the antibacterial agent after the ultraviolet sterilization is performed, and the effect of the antibacterial agent is not reduced by the ultraviolet ray.

  When the operation switching means is switched to the downward flow operation mode, a downward flow is generated in the room, and the second microorganism among the first and second microorganism reducing means provided in the circulation system and the ventilation system, respectively. Only the reduction means are driven. This downward flow causes the air containing the antibacterial agent to flow down from the upper part of the room and efficiently disperse the antibacterial agent, so that the room can be quickly maintained in an antibacterial atmosphere.

  Therefore, for example, immediately after a person or an object enters the room, the operation switching means is switched to the upward flow operation mode to form an upward flow in the room, and dust that has intruded together with the person or the object Remove from the upper air supply / exhaust port with the upward flow before dropping or adhering to the wall. Then, when the upward flow is performed for a certain period of time and dust that has entered along with people or objects is removed from the room, the operation switching means may be switched to the downward flow operation mode to form a downward flow in the room. Since the antibacterial agent is efficiently dispersed by this downward flow, the room can be maintained in an antibacterial state. In this way, by switching the operation of the air conditioning system between the upward flow operation mode and the downward flow operation mode by the operation switching means, it is possible to appropriately reduce the floating bacteria and adherent bacteria present in the room according to the situation. .

  As described above, according to the air conditioning system of the present invention, it is possible to effectively reduce indoor floating bacteria and adherent bacteria that have entered through a person or an object.

  Hereinafter, preferred embodiments of an air conditioning system according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram of an air conditioning system 10 according to the first embodiment of the present invention, which is an example of forming an upward flow in a clean room 25.

  The air conditioning system 10 is mainly composed of a clean room 25, a circulation system 27, a ventilation system 29, a microorganism reducing means that includes an ultraviolet irradiation device 18 and an antibacterial agent spraying device 20.

  The circulation system 27 includes a circulation duct 12 that connects the exhaust port 11 formed on the ceiling surface 25 </ b> A of the clean room 25 and the air supply port 13 formed below the side wall 25 </ b> B, and a blower fan 22 installed inside the circulation duct 12. The air in the clean room 25 is circulated by the blower fan 22.

  The ventilation system 29 includes an exhaust duct 14 connected to the exhaust port 11 formed in the ceiling surface 25A, an air supply duct 16 formed in the air supply port 13 below the side wall 25B, and the exhaust duct 14 and the air supply duct 16. A pair of blower fans 22 and 22 provided inside each of the interiors of the interior of the interior of the interior of the interior of the clean room 25 is supplied with outside air and the air in the clean room 25 is discharged.

  The ultraviolet irradiation device 18 of the microorganism reducing means is installed inside the circulation duct 12 and the air supply duct 16 and irradiates ultraviolet rays into the air. The antibacterial agent spraying device 20 is installed in the side wall 25B of the clean room 25, in the vicinity of the air supply port 13 of the circulation duct 12, and in the vicinity of the air supply port 13 of the air supply duct 16, and vaporizes the antibacterial agent in the air. Spray with antibacterial agent. As the antibacterial agent, hinokitiol and chlorine dioxide are preferably used, and spraying into the air is performed either alone, at the same time, or alternately.

  Further, a control device 24 is provided in the clean room 25, and controls the operation of the blower fans 22, 22,..., The ultraviolet irradiation devices 18, 18, and the antibacterial agent spray devices 20, 20,.

  Next, the operation of the air conditioning system according to the first embodiment of the present invention configured as described above will be described.

  By circulating and ventilating air using the circulation duct 12, the exhaust duct 14, and the air supply duct 16, a sanitary atmosphere is maintained in the clean room 25.

  However, when a person or an object enters or leaves the clean room 25, the floating bacteria and attached bacteria may enter the clean room 25 along with the entry and exit, and may adhere to the floor or wall of the clean room 25. If the adherent bacteria in the clean room 25 remain and multiply, the clean room 25 may be contaminated with microorganisms.

Therefore, by installing the ultraviolet irradiation devices 18 and 18 inside the circulation duct 12 and the air supply duct 16, the air passing through the circulation duct 12 and the air supply duct 16 is irradiated with ultraviolet rays, and the floating bacteria in the air are irradiated with ultraviolet rays. Can be sterilized. Further, by installing the antibacterial agent spraying devices 20, 20... Inside the side wall 25 </ b> B, the circulation duct 12, and the air supply duct 16 of the clean room 25, the antibacterial agent is added to the clean room 25 by circulation and ventilation of the air containing the antibacterial agent. Can be sprayed and kept in an antibacterial atmosphere, so that the bacteria attached to the clean room 25 can be antibacterial. Thereby, the floating microbe and the adherent microbe which have entered the clean room 25 can be reduced. Since the antibacterial agent is oxidatively decomposed when irradiated with ultraviolet rays and the antibacterial action is greatly reduced, both the circulation duct 12 and the air supply duct 16 are provided with the antibacterial agent spraying devices 20 and 20 below the ultraviolet irradiation devices 18 and 18. It is preferable to install in the vicinity of the air supply port 13 which blows out air, preferably air.

  The control device 24 operates the blower fans 22, 22... So as to circulate and ventilate air in the direction of the white arrow shown in FIG. 1, thereby generating an upward flow in the clean room 25. Due to this upward flow, the floating bacteria are sucked into the circulation duct 12 from the exhaust port 11 without falling and adhering to the floor surface 25C and the side wall 25B, and the attached bacteria already adhering to the floor surface 25C and the side wall 25B Since it is peeled and sucked into the circulation duct 12 from the exhaust port 11 together with the upward flow and sterilized by the ultraviolet irradiation device 18, the adherent bacteria in the clean room 25 can be rapidly reduced.

  FIG. 2 is a schematic configuration diagram of an air conditioning system 30 according to the second embodiment of the present invention, which is an example of forming a downward flow in the clean room 25. The same members and devices as those in the first embodiment are described with the same reference numerals, and the description thereof is omitted. The same applies to the description of the third embodiment.

  The configuration of the air conditioning system 30 is substantially the same as that of the first embodiment of the present invention, but the air supply port 13 of the air supply duct 16 is formed in the ceiling surface 25A and the exhaust port 11 of the exhaust duct 14 is formed. It is formed under the side wall 25B of the clean room 25. In addition, the air supply port 13 of the circulation duct 12 is formed in the ceiling surface 25A, and the exhaust port 11 is formed in the lower portion of the side wall 25B.

  In such an air conditioning system 30, the blower fan 22 of the circulation duct 12 blows air from the air supply port 13 of the ceiling surface 25A, and forms a circulation air flow that sucks the blown air into the circulation duct 12 from the exhaust port 11 below the side wall 25B. To do. Further, in the exhaust duct 14 and the air supply duct 16, the blower fan 22 of the air supply duct 16 blows out air from the air supply port 13 of the ceiling surface 25 </ b> A, and the blown air is exhausted below the side wall 25 </ b> B by the blower fan 22 of the exhaust duct. An air flow sucked into the exhaust duct 14 from the mouth 11 is formed. As a result, a downward flow in the direction of the black arrow shown in FIG. Therefore, the air that has been sterilized with ultraviolet rays by the circulation duct 12 and the air supply duct 16 and sprayed with the antibacterial agent is downflowed from the upper part of the clean room 25, so that the antibacterial agent can be efficiently sprayed into the clean room 25. Thereby, since the clean room 25 is rapidly hold | maintained in an antibacterial atmosphere, the adhesion microbe of the clean room 25 can be reduced effectively.

  FIG. 3 is a schematic configuration diagram of an air conditioning system 40 according to the third embodiment of the present invention, which allows switching between an upward flow and a downward flow in the clean room 25.

  The configuration of the air conditioning system 40 is a configuration in which the first and second embodiments are combined, and the air supply / exhaust port 15 of the upper ventilation duct 26A is formed in the ceiling surface 25A as the ventilation system 29, and the lower side The air supply / exhaust port 15 of the ventilation duct 26B is formed below the side wall 25B. Inside the upper and lower ventilation ducts 26A and 26B, the antibacterial agent spraying devices 20 and 20, the ultraviolet irradiation devices 18 and 18 and the blower fans 22 and 22 that can rotate forward and backward are installed in order from the air supply / exhaust port 15, The operation of these devices 18, 20, and 22 is controlled by the operation switching device 24.

  Also, as the circulation system 27, the air supply / exhaust ports 15, 15, 15 of the circulation duct 12 are formed in the ceiling surface 25A and the lower portion of the side wall 25B, respectively, and in the vicinity of each air supply / exhaust port 15, 15, 15 there is an antibacterial agent spraying device. 20, 20... Are installed, and a pair of ultraviolet irradiation devices 18, 18 are installed inside the duct with respect to the antibacterial agent spraying devices 20, 20, and can be rotated forward and backward between the pair of ultraviolet irradiation devices 18, 18. An air blowing fan 22 is provided, and the operation of these devices 18, 20, 22 is controlled by an operation switching device 24.

  Further, the operation switching device 24 includes an upward flow operation mode for generating an upward flow in the clean room 25 and a downward flow operation mode for generating a downward flow in the clean room 25. By switching the operation to the mode, the operation of each device 18, 20, 22 provided in the clean room 25 is controlled.

  Next, the operation of the air conditioning system 40 according to the third embodiment of the present invention configured as described above will be described.

  When the operation switching device 24 switches the operation of the air conditioning system 40 to the upward flow operation mode, the antibacterial agent spraying device 20 in the clean room 25 is operated, and the air flow passing through the blower fan 22 of the circulation duct 12 is lowered from above. The antibacterial agent spraying device 20 and the ultraviolet irradiation device 18 installed on the air supply / exhaust port 15 side below the side wall 25B in the circulation duct 12 are operated. Further, the blower fan 22 of the upper ventilation duct 26A operates in the direction of exhausting the air in the clean room 25, but the ultraviolet irradiation device 18 and the antibacterial agent spraying device 20 of the upper ventilation duct 26A do not operate. On the other hand, the blower fan 22 of the lower ventilation duct 26B operates in a direction to supply outside air, and the ultraviolet irradiation device 18 and the antibacterial agent spraying device 20 of the lower ventilation duct 26B operate. Thereby, since the air of the clean room 25 flows in the direction shown by the white arrow in FIG. 3 and an upward flow is generated, the floating bacteria in the clean room 25 can be sterilized with ultraviolet rays, and the inside of the clean room 25 can be maintained in a suitable atmosphere. Further, the adhering bacteria in the clean room are peeled off by the upward flow and are sterilized with ultraviolet rays in the circulation duct 12, so that the adhering bacteria can be rapidly reduced.

  On the other hand, when the operation switching device 24 switches the operation of the air conditioning system 40 to the downward flow operation mode, the antibacterial agent spraying device 20 of the clean room 25 is operated so that the air flow is upward from below in the circulation duct 12. While the blower fan 22 of the circulation duct 12 operates, the ultraviolet irradiation device 18 and the antibacterial agent spraying device 20 installed on the ceiling surface side in the circulation duct 12 operate. In the upper ventilation duct 26 </ b> A, the blower fan 22 is operated in the direction of supplying outside air, and the ultraviolet irradiation device 18 and the antibacterial agent spraying device 20 are operated. On the other hand, in the lower ventilation duct 26B, the blower fan 22 is operated in the direction of exhausting the air in the clean room 25, but the ultraviolet irradiation device 18 and the antibacterial agent spraying device 20 are not operated. As a result, the air in the clean room 25 flows in the direction indicated by the black arrow in FIG. 3 and a downward flow is generated, so that the floating bacteria in the clean room 25 are sterilized with ultraviolet rays and an antibacterial agent is effectively applied to the clean room 25. Since it can spray, the antimicrobial atmosphere of the clean room 25 can be hold | maintained rapidly.

  In this way, by switching the operation of the air conditioning system to the upward flow operation mode and the downward flow operation mode by the operation switching device 24, appropriately reduce the floating bacteria and adherent bacteria in the clean room 25 according to the situation. Can do.

  In the air conditioning system described above, the number, shape, material, and the like of each member and device are not particularly limited. The control device 24 is installed inside the clean room 25, but is not particularly limited and may be installed outside.

  In order to confirm the antibacterial effect of the attached bacteria by the antibacterial agent spraying device 20, the present inventor conducted an antibacterial test by the antibacterial agent spraying device 20 using the air conditioning system according to the first embodiment of the present invention. .

  The fungus was used as an antibacterial target, and the antibacterial effect was confirmed by measuring the growth of mycelia. As the antibacterial agent, 5% hinokitiol and 0.1 ppm chlorine dioxide were used. Furthermore, as spraying conditions, spraying of hinokitiol only, spraying of chlorine dioxide only, alternating spraying of hinokitiol and chlorine dioxide, and simultaneous spraying of hinokitiol and chlorine dioxide were always performed. For comparison, an operation in which no antibacterial agent was sprayed was performed.

  The result is shown in FIG. FIG. 4 is a graph showing changes in the growth rate of mold mycelium with respect to time in the antibacterial agent spray device 20 under each spray condition. As can be seen from FIG. 4, spraying with hinokitiol alone can suppress mycelial growth until after 20 hours, and spraying with chlorine dioxide alone, alternating spraying with hinokitiol and chlorine dioxide, and simultaneous spraying with hinokitiol and chlorine dioxide completely eliminate the mycelium. Growth was suppressed. On the other hand, in the operation in which no antibacterial agent was sprayed, mycelial growth increased after 13 hours.

  Moreover, in order to confirm the sterilization effect of the floating bacteria by the ultraviolet irradiation device 18, the sterilization test of the floating bacteria by the ultraviolet irradiation device 18 at each wind speed is performed using the air conditioning system according to the first embodiment of the present invention. went. Note that a medium output germicidal lamp (90 W) was used as the ultraviolet irradiation device.

  The result is shown in FIG. FIG. 5 is a graph showing the change in the sterilization efficiency of airborne bacteria with respect to the wind speed in the ultraviolet irradiation device 18. As can be seen from FIG. 5, 90% or more of the floating bacteria could be sterilized at a wind speed of 2 m / s or less.

The schematic block diagram of the clean room which used the air-conditioning system which is the 1st Embodiment of this invention suitably The schematic block diagram of the clean room which used the air-conditioning system which is the 2nd Embodiment of this invention suitably The schematic block diagram of the clean room which used the air-conditioning system which is the 3rd Embodiment of this invention suitably The graph which showed the change of the growth rate of mold mycelium with respect to time in each spraying condition of the antibacterial agent spraying device in the present invention The graph which showed the change of the sterilization efficiency of floating bacteria with respect to the wind speed in the ultraviolet irradiation device in this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10, 30, 40 ... Air conditioning system, 11 ... Exhaust port, 12 ... Circulation duct, 13 ... Air supply port, 14 ... Exhaust duct, 15 ... Supply / exhaust port, 16 ... Air supply duct, 18 ... Ultraviolet irradiation device, 20 ... Antibacterial agent spray device, 22 ... Blower fan, 24 ... Control device or operation switching device, 25 ... Clean room, 25A ... Ceiling surface, 25B ... Side wall, 25C ... Floor surface, 26A ... Upper ventilation duct, 26B ... Lower ventilation duct

Claims (1)

A circulation system that circulates indoor air; a ventilation system that ventilates the indoor air; and a microorganism reduction means that is provided in at least the circulation system and the ventilation system, and reduces microorganisms present in the indoor air; An air conditioning system comprising:
  Forming the air supply and exhaust ports of the circulation system and the ventilation system at the upper position and the lower position in the room,
  An upward flow operation mode in which air is supplied into the room from the air supply / exhaust port at the lower position and exhausted from the air supply / exhaust port at the upper position; An operation switching means for switching between a downward flow operation mode for exhausting air from the air supply / exhaust port,
  As the microorganism reducing means, a first microorganism reducing means in which an ultraviolet irradiation device that irradiates ultraviolet rays in the air flow in the upward flow operation mode is arranged upstream of an antibacterial agent spraying device that sprays an antibacterial agent; In the air flow in the countercurrent operation mode, the ultraviolet irradiation device is configured with second microorganism reducing means arranged on the upstream side of the antibacterial agent injection device,
  The operation switching means drives only the first microorganism reducing means in the upward flow operation mode, and drives only the second microorganism reduction means in the downward flow operation mode. An air conditioning system characterized by

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