JP2012075331A - Ventilation system for plant cultivation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pollution of air taken into the interior from the exterior.SOLUTION: The ventilation system (10) for plant cultivation facilities includes a casing (11) in which an inlet (12) for taking in exterior air and an air outlet (13) are formed, and a blower fan (15). Exterior air is taken into the casing (11) and treated, and the treated air is fed into a greenhouse (1) for plant cultivation facilities from the outlet (13). The ventilation system also includes: a dust collection device (20) disposed within the casing (11) for removing dust in the taken-in air; a discharge device (60) having a water storage tank (61) for storing water, an electrode pair (64 and 65) for generating streamer discharge under water in the water storage tank (61) and a power supply (70) for applying the direct voltage to the electrode pair (64 and 65), and configured to generate hydrogen peroxide under water in the water storage tank (61) by the streamer discharge; and a spray unit (30) for feeding water containing hydrogen peroxide within the water storage tank (61) to a dust collection part (25).

Description

    The present invention relates to a ventilation device for a plant cultivation facility, and particularly relates to a means for sterilizing air supplied to a plant cultivation facility room.

    2. Description of the Related Art Conventionally, a cultivation means for performing cultivation by providing a cultivation floor such as a plant (crop) in a cultivation room such as a vinyl house is known. The house used for such a cultivation means takes outdoor air into the house by a ventilator for the purpose of efficient cultivation of plants (crop) and the like (Patent Document 1). However, such outdoor air may contain dust and the like.

    For such a problem, a method of collecting and removing dust by attaching a filter to an outdoor air intake port or the like can be considered.

JP 2009-244731 A

    However, in the conventional ventilator, bacteria may remain or propagate in the filter in which dust is collected, and such bacteria again adhere to newly taken outdoor air and enter the room. There was a problem.

    This invention is made | formed in view of such a point, and it aims at preventing the adhesion | attachment of the microbe to intake air in the ventilation apparatus for plant cultivation facilities provided with the dust collector.

    The first invention includes a casing (11) in which an outdoor air inlet (12) and an air outlet (13) are formed, and an inlet fan (15, 82a) accommodated in the casing (11) The outdoor air is taken into the casing (11) from the suction port (12) by the suction fan (15, 82a), and the treated air is treated and planted from the blowout port (13). A ventilation device that supplies the house (1) for cultivation facilities, the dust collector (20) that is provided in the casing (11) and removes dust in the intake air, and stores water A storage tank (61), an electrode pair (64, 65) that generates streamer discharge in the water of the storage tank (61), and a DC power source (70) that applies a DC voltage to the electrode pair (64, 65). A discharge device (60) for generating hydrogen peroxide in the water of the water storage tank (61) by the streamer discharge; The water containing hydrogen peroxide serial cistern (61) in comprises supplying device (30) supplied to the dust collector (20).

    In the first aspect, when the suction fan (15, 82a) is driven, outdoor air is sucked into the casing (11) from the suction port (12). In the casing (11), the dust collector (20) collects dust in the intake air. The intake air from which dust has been removed by the dust collector (20) is supplied to the room as treated air.

    In the discharge device (60), a DC voltage is applied from the DC power source (70) to the electrode pair (64, 65). Thereby, streamer discharge occurs in the water of the water storage tank (61). Along with the streamer discharge, hydrogen peroxide is generated in the water in the water storage tank (61). Hydrogen peroxide tends to remain in water even under relatively high temperature conditions. Specifically, hydrogen peroxide is decomposed only at a concentration of about 4% even when about 1 hour has passed under a condition where the water temperature is about 40 ° C. or higher. Therefore, in the ventilator of the present invention, even if the water temperature of the water storage tank (61) is relatively high, the dust collector (20) can be sufficiently sterilized and purified with water containing hydrogen peroxide.

    Further, in the water, active species such as hydroxyl radicals are also generated with the occurrence of streamer discharge. For this reason, harmful substances (for example, sulfur compounds) contained in water are oxidatively decomposed and removed by active species.

    Further, in the present invention, streamer discharge is performed using the DC power supply (70), so that the power supply unit can be simplified, reduced in cost, and reduced in size compared with, for example, a pulse power supply. Moreover, when a pulse power supply is used, the shock wave and noise which generate | occur | produce in water with discharge will become large. On the other hand, when a DC power source (70) is used, such shock waves and noise can be reduced.

    The supply device (30) supplies water containing hydrogen peroxide in the water storage tank (61) to the dust collector (20). Thereby, the dust collector (20) is sterilized and purified.

    In a second aspect based on the first aspect, the casing (11) is formed with an exhaust air inlet (83) for taking in indoor air and an exhaust outlet (84) for exhausting the indoor air, An exhaust fan (82b) that exhausts the indoor air taken in from the exhaust suction port (83) from the exhaust air outlet (84) is housed inside, and the suction fan (15, 82a) and the exhaust fan (82b) are: The intake amount of the outdoor air is configured to be larger than the exhaust amount of the indoor air.

    In the second aspect, when the suction fan (15, 82a) is driven, outdoor air is sucked into the casing (11) from the suction port (12). In the casing (11), the dust collector (20) collects dust in the intake air. The intake air from which dust has been removed by the dust collector (20) is supplied to the room as treated air. Further, when the exhaust fan (82b) is driven, room air is sucked into the casing (11) from the exhaust suction port (83) and exhausted to the outside from the exhaust air outlet (84).

    In the present invention, for example, the capacity of the intake fan (15, 82a) can be made larger than the capacity of the exhaust fan (82b) so that the intake amount of outdoor air can be made larger than the exhaust amount of indoor air. By doing so, since the indoor air pressure becomes higher than the outside air pressure, it is possible to prevent the outdoor air from flowing into the room through a gap in the room or the like. As a result, it is possible to prevent the dust contained in the outdoor air from entering the room.

    The intake fan (15, 82a) or the exhaust fan (82b) may be controlled using a controller or the like so that the intake amount of the outdoor air is larger than the exhaust amount of the indoor air. According to this, since the indoor air pressure becomes higher than the external air pressure, the inflow of outdoor air into the room from the gap or the like can be prevented. As a result, it is possible to prevent the dust contained in the outdoor air from entering the room.

    According to a third aspect of the present invention, there is provided a heat exchanger (87) provided in the casing (11), for exchanging heat between the taken-in indoor air and outdoor air.

    In the third invention, the heat exchanger (87) exchanges heat between the outdoor air taken in from the suction port (12) and the indoor air taken in from the exhaust suction port (83). Thereby, if the temperature of the outdoor air is higher than the temperature of the indoor air, the outdoor air is cooled to be treated air, and is blown out into the room from the outlet (13). On the other hand, if the temperature of the outdoor air is lower than the temperature of the indoor air, the outdoor air is heated to become treated air, and is blown out into the room from the outlet (13).

    According to a fourth invention, in any one of the first to third inventions, the dust collector (20) includes a charging unit (22) for charging the dust in the intake air, and the charging unit. A dust collecting part (25) for electrically collecting the dust charged in (22), and the supply device (30) supplies water containing hydrogen peroxide to the dust collecting part (25). It is configured to

    In the fourth aspect of the invention, the dust in the intake air is charged to a positive or negative charge in the charging unit (22). The dust charged by the charging unit (22) is attracted to the dust collecting unit (25) and is electrically captured. Thereby, dust in the intake air is removed. The supply device (30) supplies water containing hydrogen peroxide in the water storage tank (61) to the dust collecting section (25). Thereby, the dust collection part (25) where dust was collected is sterilized and purified.

    According to a fifth invention, in any one of the first to third inventions, the dust collector (20) includes a filter member (81) for capturing dust in the intake air, and the supply The device (30) is configured to supply water containing hydrogen peroxide to the filter member (81).

    In the fifth aspect, when the intake air passes through the filter member (81), dust in the intake air is captured by the filter member (81). The supply device (30) supplies water containing hydrogen peroxide generated by the discharge device (60) to the filter member (81). Thereby, the filter member (81) in which dust is collected is sterilized and purified.

    According to the first aspect of the invention, since water containing hydrogen peroxide is supplied to the dust collector (20), the dust collector (20) can be sterilized and purified. That is, in the dust collecting device (20) in which dust is collected, bacteria may remain or propagate, and these bacteria may adhere to the taken-in outdoor air again. However, in the present invention, since the dust collector (20) is sterilized and purified, it is possible to reliably prevent bacteria from remaining or breeding in the dust collector (20). Thereby, it can prevent that microbe adheres to the process air supplied indoors. As a result, it is possible to prevent bacteria from entering the room.

    In the present invention, streamer discharge is performed to generate hydrogen peroxide. Hydrogen peroxide is not easily decomposed even when the water temperature rises, compared to hypochlorous acid. For this reason, it is possible to reliably sterilize and purify the dust collector (20) while sufficiently sterilizing and purifying water supplied to the dust collector (20) with hydrogen peroxide. Further, in the streamer discharge, a large amount of active species are generated in the water, so that the dust collector (20) can be surely sterilized and purified while effectively removing harmful substances in the water by the active species.

    According to the second aspect, since the intake amount of the outdoor air is made larger than the exhaust amount of the room air, the indoor air pressure can be made higher than the outside air pressure. Accordingly, since outdoor air can be prevented from entering the room through a gap between the rooms and the like, dust in the outdoor air can be prevented from entering the room.

    According to the third aspect, since the heat exchanger (87) is provided, heat can be exchanged between the outdoor air and the indoor air. Thereby, intake air can be heated or cooled using indoor air. As a result, the indoor temperature can be adjusted.

    According to the fourth aspect of the present invention, since the dust collector (20) including the charging unit (22) and the dust collecting unit (25) is used, for example, the dust collection performance associated with long-term operation compared to the filter is improved. A drop can be prevented, and further an increase in pressure loss due to clogging or the like can be prevented. In addition, since water containing hydrogen peroxide is supplied to the dust collection section (25), the dust collection section (25) that collects the dust can be sterilized and purified.

    According to the fifth aspect, since the dust collector (20) provided with the filter member (81) is used, the dust collector (20) can be formed easily and inexpensively. In addition, since water containing hydrogen peroxide is supplied to the filter member (81), the filter member (81) collecting dust can be sterilized and purified.

It is the schematic which shows the house and ventilation apparatus which concern on this Embodiment 1. FIG. 1 is a schematic cross-sectional view showing a ventilation device according to a first embodiment. It is a whole block diagram of the discharge device which concerns on this Embodiment 1, and shows the state before starting the production | generation operation | movement of hydrogen peroxide. It is a perspective view of the insulation casing which concerns on this Embodiment 1. FIG. It is a whole block diagram of the discharge device which concerns on this Embodiment 1, and the state which started the production | generation operation | movement of hydrogen peroxide and the bubble was formed is shown. It is a whole block diagram of the discharge device which concerns on the modification of this Embodiment 1. It is a perspective view of the insulation casing which concerns on the modification of this Embodiment 1. FIG. It is a whole block diagram of the discharge device which concerns on this Embodiment 2, and shows the state before starting the production | generation operation | movement of hydrogen peroxide. It is a whole block diagram of the discharge device which concerns on this Embodiment 2, and the state which started the production | generation operation | movement of hydrogen peroxide and the bubble was formed is shown. It is a top view of the lid part of the insulation casing which concerns on the modification of this Embodiment 2. It is the schematic which shows the house and ventilation apparatus which concern on this Embodiment 3. It is general | schematic sectional drawing which shows the ventilation apparatus which concerns on this Embodiment 3. FIG. It is a schematic diagram which shows the ventilation apparatus which concerns on this Embodiment 4. It is general | schematic sectional drawing which shows the ventilation apparatus which concerns on this Embodiment 4.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
As shown in FIG.1 and FIG.2, the ventilation apparatus (10) which concerns on this Embodiment 1 ventilates the house (1) for plant cultivation facilities. In the following description, “indoor” means “inside of house (1)”, and “outside” means “outside of house (1)”. The ventilation device (10) includes a casing (11), a blower fan (15), a dust collection unit (20), a discharge device (60), and a spray unit (30).

    The casing (11) is formed in a vertically long rectangular box and is installed near the side surface of the house (1). And the casing (11) is installed so that the back surface may oppose the side surface of a house (1). The casing (11) has a suction port (12) for taking in outside air (outdoor air) in the lower part of the front surface, and the outdoor air (hereinafter referred to as intake air) taken in from the suction port (12) in the upper part on the back side (house) 1) A blower outlet (13) is formed to be fed into the inside. Note that an air port for allowing processing air to flow in is formed on the surface of the house (1) facing the air outlet (13) (not shown).

    The inside of the casing (11) is configured as a flow passage (14) through which air flows from the suction port (12) toward the blowout port (13). The blower fan (15) and the dust collection unit (20) are arranged along the air flow in the flow passage (14) inside the casing (11).

    The blower fan (15) is for supplying intake air taken into the casing (11) into the room, and constitutes a suction fan according to the present invention. The blower fan (15) constitutes a fan unit for intake air, and is disposed substantially at the upper part of the casing (11).

    The dust collection unit (20) removes dust in the air passing through the flow passage (14) in the casing (11), and constitutes a dust collector according to the present invention. The dust collection unit (20) is provided between the suction port (12) and the blower fan (15) in the flow passage (14) in the casing (11). The dust collection unit (20) includes a pre-filter (21), a charging unit (22), and a dust collection unit (25) arranged in order toward the upstream side of the air, and constitutes an electric dust collection device. ing.

    The pre-filter (21) constitutes a filter for collecting relatively large dust contained in the intake air taken into the casing (11).

    The charging unit (22) charges relatively small dust that has passed through the prefilter (21). The charging section (22) is composed of a plurality of discharge electrodes (23) and a plurality of counter electrodes (24), and a DC voltage is applied between the discharge electrodes (23) and the counter electrodes (24) to take It is configured to charge dust in the air.

    The discharge electrode (23) is made up of ionization lines, is provided across the left and right ends of the charging portion (22), and a plurality of electrodes are arranged in parallel in the depth direction. The counter electrode (24) is provided across the left and right ends of the charging unit (22), and a plurality of the counter electrodes (24) are arranged in parallel in the depth direction. The discharge electrode (23) is disposed between the two counter electrodes (24). Therefore, the space between the discharge electrode (23) and the counter electrode (24) in the charging part (22) is along the air flow in the casing (11) from the suction port (12) toward the blowout port (13). An air passage extending in the direction is configured. That is, an air passage parallel to the flow passage (14) in the casing (11) is formed between the discharge electrode (23) and the counter electrode (24).

    The dust collection part (25) adsorbs and collects the dust charged by the charging part (22), and includes a dust collection electrode (26) as a ground electrode. The dust collection electrodes (26) are provided across the left and right ends of the dust collection section (25), and a plurality of the dust collection electrodes (26) are arranged in parallel in the depth direction. The dust collection section (25) may include a high voltage electrode and a dust collection electrode, and a DC voltage may be applied between them to generate an electric field so that charged dust is adsorbed to the dust collection electrode.

    The spray unit (30) sprays water containing hydrogen peroxide generated by a discharge device (60), which will be described later, onto the dust collection part (25), and constitutes a supply device according to the present invention. is doing. The spray unit (30) includes a spray unit (31) and a pump (32). The spray unit (30) is configured to suck up water containing hydrogen peroxide in a water storage tank (61), which will be described later, by a pump (32) and spray it from the spray section (31) toward the dust collection section (25). Has been.

<Detailed structure of discharge device>
The ventilation device (10) includes a discharge device (60). The discharge device (60) generates a purification component such as hydrogen peroxide in water by streamer discharge in water, and generates water containing hydrogen peroxide (hereinafter, water containing hydrogen peroxide). The discharge device (60) includes a water storage tank (61) and a discharge unit (62) (see FIG. 3).

    The water storage tank (61) is a rectangular box tank in which water is stored. The water storage tank (61) of the first embodiment is formed in a sealed container shape, and an air hole is formed, although not shown. In addition, you may comprise a part inside water storage tank (61) with a copper member. By generating copper ions from the copper member, copper ions can be supplied to the water storage tank (61).

    The discharge unit (62) includes an electrode pair (64, 65) including a discharge electrode (64) and a counter electrode (65), and a power supply unit (70) for applying a voltage to the electrode pair (64, 65). And an insulating casing (71) for accommodating the discharge electrode (64) therein.

    The electrode pair (64, 65) is for generating a streamer discharge in water. The discharge electrode (64) is disposed inside the insulating casing (71). The discharge electrode (64) is formed in a flat plate shape up and down. The discharge electrode (64) is connected to the positive electrode side of the power supply unit (70). The discharge electrode (64) is made of a conductive metal material such as stainless steel or copper.

    The counter electrode (65) is disposed outside the insulating casing (71). The counter electrode (65) is provided above the discharge electrode (64). The counter electrode (65) has a flat plate shape in the vertical direction, and is configured in a mesh shape or a punching metal shape having a plurality of through holes (66) in the vertical direction. The counter electrode (65) is disposed substantially parallel to the discharge electrode (64). The counter electrode (65) is connected to the negative electrode side of the power supply unit (70). The counter electrode (65) is made of a conductive metal material such as stainless steel or brass.

    The power supply unit (70) is constituted by a DC power supply that applies a predetermined DC voltage to the electrode pair (64, 65). That is, the power supply unit (70) is not a pulse power supply that repeatedly applies a high voltage instantaneously to the electrode pair (64, 65), but is always a few kilovolts of direct current to the electrode pair (64, 65). Apply voltage. Of the power supply unit (70), the negative electrode side to which the counter electrode (65) is connected is connected to the ground. The power supply unit (70) is provided with a constant power control unit (not shown) that controls the discharge power of the electrode pair (64, 65) to be constant.

    The insulating casing (71) is installed at the bottom of the water storage tank (61). The insulating casing (71) is made of an insulating material such as ceramics. The insulating casing (71) has a container-like case body (72) whose one surface (upper surface) is open, and a plate-like lid (73) that closes the open portion above the case body (72). is doing.

    The case body (72) has a square cylindrical side wall (72a) and a bottom (72b) that closes the bottom of the side wall (72a). The discharge electrode (64) is laid on the upper side of the bottom (72b). In the insulating casing (71), the vertical distance between the lid (73) and the bottom (72b) is longer than the thickness of the discharge electrode (64). That is, a predetermined interval is ensured between the discharge electrode (64) and the lid (73). Thereby, a space (S) is formed between the discharge electrode (64), the case main body (72), and the lid portion (73) inside the insulating casing (71).

    As shown in FIGS. 3 and 4, the lid (73) of the insulating casing (71) is formed with one opening (74) penetrating the lid (73) in the thickness direction. This opening (74) allows the formation of an electric field between the discharge electrode (64) and the counter electrode (65). The inner diameter of the opening (74) of the lid (73) is preferably 0.02 mm or more and 0.5 mm or less. The opening (74) as described above constitutes a current density concentration portion that increases the current density of the current path between the electrode pair (64, 65).

    As described above, the insulating casing (71) accommodates only one electrode (discharge electrode (64)) of the electrode pair (64, 65) inside, and the opening (74) as a current density concentration portion. The insulating member which has this is comprised.

    In addition, in the opening (74) of the insulating casing (71), the current density of the current path increases, so that water is vaporized by Joule heat and bubbles (B) are formed. That is, the opening (74) of the insulating casing (71) functions as a gas phase forming part that forms bubbles (B) as a gas phase part in the opening (74).

-Driving action-
Next, the ventilation operation of the ventilation device (10) described above will be described.

    First, when the blower fan (15) is driven, outdoor air is sucked into the casing (11) from the suction port (12). The intake air taken into the casing (11) flows toward the dust collection unit (20) through the flow passage (14). In the dust collection unit (20), a DC voltage is applied between the discharge electrode (23) and the counter electrode (24) of the charging unit (22).

    The intake air passes through the prefilter (21), and relatively large dust contained in the intake air is collected. The intake air that has passed through the prefilter (21) flows to the charging section (22). In the charging unit (22), relatively small dust that has passed through the prefilter (21) is charged. For example, the dust is charged to the positive electrode, and the charged dust flows downstream.

    The charged dust flows into the dust collecting portion (25), and the dust charged on the positive electrode is adsorbed on the surface of the dust collecting portion (25) by the dust collecting portion (25) serving as the ground electrode.

    When dust is removed from the intake air, it becomes clean process air, flows through the blower fan (15), and blows out into the room from the blowout port (13).

-Operation of discharge device-
In the ventilator (10) of the present embodiment, when the discharge device (60) is operated, water containing hydrogen peroxide is generated in the water storage tank (61). The operation of the discharge device (60) will be described in detail.

    At the start of the operation of the discharge device (60), as shown in FIG. 3, the space (S) in the insulating casing (71) is in a flooded state. When a predetermined DC voltage (for example, 1 kV) is applied from the power supply unit (70) to the electrode pair (64, 65), an electric field is formed between the electrode pair (64, 65). The periphery of the discharge electrode (64) is covered with an insulating casing (71). For this reason, the leakage current between the electrode pair (64, 65) is suppressed, and the current density of the current path in the opening (74) is increased.

    As the current density in the opening (74) increases, the Joule heat in the opening (74) increases. As a result, in the insulating casing (71), the vaporization of water is promoted in the vicinity of the opening (74) to form bubbles (B). As shown in FIG. 5, the bubbles (B) cover almost the entire area of the opening (74), and are formed between the water on the negative electrode side conducting to the counter electrode (65) and the discharge electrode (64) on the positive electrode side. Air bubbles (B) are interposed between them. Therefore, in this state, the bubble (B) functions as a resistance that prevents conduction through water between the discharge electrode (64) and the counter electrode (65). Thereby, the leakage current between the discharge electrode (64) and the counter electrode (65) is suppressed, and a desired potential difference is maintained between the electrode pair (64, 65). Then, streamer discharge is generated in the bubble (B) due to dielectric breakdown.

    As described above, when streamer discharge is performed with the bubbles (B), active species such as hydroxyl radicals, hydrogen peroxide, and the like are generated in the water in the water storage tank (61). Active species such as hydroxyl radicals and hydrogen peroxide are convected in the water storage tank (61) by the heat accompanying the streamer discharge. This promotes diffusion of active species and hydrogen peroxide in water. Further, when streamer discharge is performed with the bubbles (B), an ion wind is easily generated with the bubbles (B) along with the streamer discharge. Therefore, in the water storage tank (61), the diffusion effect of active species and hydrogen peroxide can be further improved by using this ion wind.

    Further, as described above, when a part of the water storage tank (61) is formed of a copper member, copper ions eluted from the copper member are supplied. In the presence of hydrogen peroxide and copper ions, copper ions act catalytically by the Fenton reaction to promote the generation of hydroxyl radicals. Thereby, the purification efficiency of the water and the dust collection part (25) by a hydroxyl radical improves. In addition, since copper ions have the effect of suppressing the growth of bacteria, the bactericidal action in water and in the dust collecting part (25) is also increased.

    As described above, active species such as hydroxyl radicals diffused in water are used to purify water by oxidizing and decomposing components to be treated (for example, ammonia) contained in water. In addition, hydrogen peroxide diffused in water is used for water sterilization. Further, water in which hydrogen peroxide is generated (water containing hydrogen peroxide) is sucked up by the pump (32) of the spray unit (30) and sprayed from the spray section (31) to the dust collection section (25). Thereby, since water containing hydrogen peroxide is given to the dust collection part (25) which collected dust, the dust collection part (25) is sterilized and the propagation of bacteria is controlled.

-Effect of Embodiment 1-
According to Embodiment 1 described above, since water containing hydrogen peroxide is supplied to the dust collection part (25), the dust collection part (25) can be sterilized and purified. That is, in the dust collection part (25) where dust was collected, bacteria may remain or propagate, and the bacteria may adhere to the intake air again. However, in the first embodiment, since the dust collecting part (25) is sterilized and purified, it is possible to prevent bacteria from remaining or breeding. Thereby, it can prevent that microbe adheres to the process air supplied in the house (1). As a result, it is possible to prevent bacteria from entering the house (1).

    In the first embodiment, streamer discharge is performed to generate hydrogen peroxide. Hydrogen peroxide is not easily decomposed even when the water temperature rises, compared to hypochlorous acid. For this reason, it is possible to reliably sterilize and purify the dust collecting part (25) while sufficiently sterilizing and purifying water supplied to the dust collecting part (25) with hydrogen peroxide. In addition, since a large amount of active species is generated in the water in the streamer discharge, the dust collection part (25) can be sterilized and purified while effectively removing harmful substances in the water by the active species.

    In addition, since the dust collection unit (20) provided with the charging unit (22) and the dust collection unit (25) is used, it is possible to prevent a decrease in dust collection performance associated with long-term operation compared to, for example, a filter. An increase in pressure loss due to clogging or the like can also be prevented.

<Modification of Embodiment 1>
In the first embodiment, one opening (74) is formed in the lid (73) of the insulating casing (71). However, for example, as shown in FIGS. 6 and 7, a plurality of openings (74) may be formed in the lid portion (73) of the insulating casing (71). In this modification, the lid portion (73) of the insulating casing (71) is formed in a substantially square plate shape, and a plurality of openings (74) are arranged in a grid pattern in the lid portion (73) at regular intervals. Has been. On the other hand, the discharge electrode (64) and the counter electrode (65) are formed in a square plate shape over all the openings (74).

    Also in this modification, each opening (74) functions as a current density concentration part and a gas phase formation part. As a result, when a DC voltage is applied from the power supply unit (70) to the electrode pair (64, 65), the current density of each opening (74) increases, and bubbles (B) are formed in each opening (74). The As a result, streamer discharge is generated in each bubble (B), and active species such as hydroxyl radicals and hydrogen peroxide are generated.

<Embodiment 2 of the invention>
The ventilation device (10) according to the second embodiment is different from the first embodiment described above in the configuration of the discharge unit (62). In the following, differences from the first embodiment will be mainly described.

    As shown in FIG. 8, the discharge unit (62) of the second embodiment is configured as a so-called flange unit type that is inserted and fixed from the outside to the inside of the water storage tank (61). In the discharge unit (62) of the second embodiment, the discharge electrode (64), the counter electrode (65), and the insulating casing (71) are integrally assembled.

    The insulating casing (71) of Embodiment 2 has a substantially outer shape that is cylindrical. The insulating casing (71) has a case body (72) and a lid (73).

    The case main body (72) of Embodiment 2 is made of an insulating material made of glass or resin. The case body (72) includes a cylindrical base portion (76), a cylindrical wall portion (77) projecting from the base portion (76) toward the water storage tank (61), and the cylindrical wall portion (77). And an annular convex part (78) projecting further toward the water storage tank (61) side. The case body (72) is integrally formed with a distal end cylindrical portion (79) on the distal end side of the annular convex portion (78). A cylindrical insertion port (76a) is formed in the axial center portion of the base portion (76) so as to extend in the axial direction. A cylindrical space (S) that is coaxial with the insertion port (76a) and has a larger diameter than the insertion port (76a) is formed inside the cylindrical wall (77).

    The lid portion (73) of the second embodiment is formed in a substantially disc shape and is fitted inside the annular convex portion (78). The lid (73) is made of a ceramic material. As in the first embodiment, one circular opening (74) penetrating the lid (73) up and down is formed at the axis of the lid (73).

    The discharge electrode (64) is a vertically long rod-shaped electrode having a circular cross section perpendicular to the axis. The discharge electrode (64) is fitted in the insertion opening (76a) of the base (76). Thereby, the discharge electrode (64) is accommodated in the insulating casing (71). In the second embodiment, the end of the discharge electrode (64) opposite to the water storage tank (61) is exposed to the outside of the water storage tank (61). For this reason, the power supply part (70) arrange | positioned outside the water storage tank (61) and the discharge electrode (64) can be easily connected by electrical wiring.

    The end (64a) on the water storage tank (61) side of the discharge electrode (64) faces the space (S) inside the insulating casing (71). In the example shown in FIG. 8, the end portion (64a) of the discharge electrode (64) protrudes above the opening surface of the insertion port (76a) (on the water storage tank (61) side). The distal end surface of (64a) may be substantially flush with the opening surface of the insertion port (76a), or the end (64a) may be recessed below the opening surface of the insertion port (76a). In addition, the discharge electrode (64) has a predetermined gap between the discharge electrode (64) and the lid (73) having the opening (74), as in the first embodiment.

    The counter electrode (65) has a cylindrical electrode body (65a) and a flange (65b) projecting radially outward from the electrode body (65a). The electrode body (65a) is externally fitted to the case body (72) of the insulating casing (71). The flange part (65b) constitutes a fixed part that is fixed to the wall part of the water storage tank (61) and holds the discharge unit (62). In a state where the discharge unit (62) is fixed to the water storage tank (61), a part of the electrode body (65a) of the counter electrode (65) is submerged.

    The counter electrode (65) includes an inner cylindrical portion (65c) having a smaller diameter than the electrode main body (65a) and a connecting portion (65d) formed between the inner cylindrical portion (65c) and the electrode main body (65a). ). The inner cylinder part (65c) and the connecting part (65d) are immersed in the water in the water storage tank (61). The inner cylinder part (65c) forms the cylindrical space (67) in the inside. One end of the inner cylinder portion (65c) in the axial direction constitutes a holding portion that contacts the lid portion (73) and holds the lid portion (73). Further, the tip cylinder part (79) of the case body (72) is fitted between the electrode body (65a), the inner cylinder part (65c), and the connecting part (65d). On the other end side in the axial direction of the inner cylinder portion (65c), a mesh-shaped leakage preventing material (68) is provided so as to cover the cylindrical space (67). The leakage preventive material (68) is substantially grounded by contacting the counter electrode (65). Thereby, the leakage preventive material (68) prevents leakage from the inside to the outside of the cylindrical space (67) in the space (underwater) inside the water storage tank (61).

    The counter electrode (65) is in a state where a part of the electrode body (65a) is exposed to the outside of the water storage tank (61). For this reason, a power supply part (70) and a counter electrode (65) can be easily connected by electrical wiring.

-Operation of discharge device-
Also in the ventilation device (10) of the second embodiment, when the discharge device (60) is operated, water containing hydrogen peroxide is generated in the water storage tank (61).

    At the start of the operation of the discharge device (60), as shown in FIG. 8, the space (S) in the insulating casing (71) is in a flooded state. When a predetermined DC voltage (for example, 1 kV) is applied from the power supply unit (70) to the electrode pair (64, 65), the current density inside the opening (74) increases.

    When a DC voltage is continuously applied to the electrode pair (64, 65) from the state shown in FIG. 8, water in the opening (74) is vaporized to form bubbles (B) (see FIG. 9). reference). In this state, the bubble (B) covers almost the entire area of the opening (74), and resistance due to the bubble (B) is present between the water on the negative electrode side in the cylindrical space (67) and the discharge electrode (64). Is granted. As a result, the potential difference between the discharge electrode (64) and the counter electrode (65) is maintained, and streamer discharge is generated in the bubbles (B). As a result, hydroxyl radicals and hydrogen peroxide are generated in water, and these components are used for water purification and sterilization / purification in the dust collection section (25).

<Modification of Embodiment 2>
In the second embodiment, one opening (74) is formed in the axis of the disc-shaped lid (73). However, even if a plurality of openings (74) are formed in the lid (73). Good. In the example shown in FIG. 10, five openings (74) are arranged at equal intervals on a virtual pitch circle centered on the axis of the lid (73). By forming a plurality of openings (74) in the lid (73) in this way, streamer discharge can be caused in the vicinity of each opening (74).

Embodiment 3 of the Invention
Next, a third embodiment of the present invention will be described. As shown in FIGS. 11 and 12, the third embodiment differs from the first embodiment in the arrangement of the casing (11) and the configuration of the dust collection unit (20).

    Specifically, the casing (11) of the third embodiment is formed in a horizontally-long rectangular box and is disposed near the side surface in the width direction of the ceiling of the house (1). The casing (11) has a suction port (12) that takes in outside air (outdoor air) on the front surface, and outdoor air (hereinafter referred to as intake air) that is taken in from the suction port (12) on the back side into the house (1). A supply outlet (13) is formed. Note that an air port for allowing processing air to flow in is formed on the surface of the house (1) facing the air outlet (13) (not shown). The said blower outlet (13) is connected with the inside of a house (1) through several duct (13a).

    The inside of the casing (11) is configured as a flow passage (14) through which air flows from the suction port (12) toward the blowout port (13). The blower fan (15) and the dust collection unit (20) are arranged along the air flow in the flow passage (14) inside the casing (11).

    The dust collection unit (20) includes a filter (81). The filter (81) is disposed between the blower fan (15) and the suction port (12) in the casing (11) so as to cover the flow passage (14). And it is comprised so that the dust contained in the intake air which passes the flow path (14) in a casing (11) may be collected and removed. The spray unit (30) sprays water containing hydrogen peroxide generated by the discharge device (60) toward the filter (81). Thereby, in the filter (81) in which dust is collected, bacterial residue or propagation can be suppressed.

    According to the third embodiment, since the dust collection unit (20) is configured by the filter (81), dust can be collected and removed with an inexpensive and simple configuration. Other configurations, operations and effects are the same as those of the first embodiment.

<Embodiment 4 of the Invention>
Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, as shown in FIGS. 13 and 14, a total heat exchanger (87) is added to the configuration of the third embodiment.

    Specifically, the ventilation device (10) according to the fourth embodiment includes a casing (11), a centrifugal fan (82), a dust collection unit (20), and a total heat exchanger (87). Since the configuration of the dust collection unit (20) is the same as that of the third embodiment, the description is omitted.

    The casing (11) is formed in a horizontally long rectangular box, and is disposed in the vicinity of the side surface in the width direction of the ceiling of the house (1). The casing (11) has a suction port (12) for taking outside air (outdoor air) in the lower part of the front surface, and the outdoor air (hereinafter referred to as intake air) taken from the suction port (12) on the back side is house (1). An air outlet (13) for supplying the air into the inside is formed. In addition, the casing (11) is formed with an exhaust suction port (83) for taking in indoor air in the approximate center of the bottom surface and an exhaust outlet (84) for exhausting the exhaust air taken in at the upper part of the front surface. In addition, an air port for allowing process air to flow in is formed on a surface of the house (1) that faces the air outlet (13) of the casing (11) (not shown).

    Inside the casing (11), a total heat exchanger (87) is arranged at the center, and a centrifugal fan (82) is arranged between the total heat exchanger (87) and the outlet (13). . Therefore, the inside of the casing (11) has a flow passage (air flows from the suction port (12) through the total heat exchanger (87) and the upper part of the centrifugal fan (82) toward the outlet (13). 14), an exhaust passage (85) through which air flows from the exhaust inlet (83) to the exhaust outlet (84) via the total heat exchanger (87) and the lower part of the centrifugal fan (82). ).

    The centrifugal fan (82) includes an upper fan (82a) and a lower fan (82b), and is disposed between the total heat exchanger (87) and the blower outlet (13). The upper fan (82a) constitutes a suction fan according to the present invention, and the lower fan (82b) constitutes an exhaust fan according to the present invention. The upper fan (82a) is formed so that the fin outer diameter is larger than that of the lower fan (82b), and the air flow rate is larger than that of the lower fan (82b). As a result, the amount of air supplied into the house (1) is larger than the amount of exhaust, so the air pressure in the house (1) becomes higher than the external pressure. Thereby, intrusion of outside air into the house (1) can be prevented. The suction fan and the exhaust fan of the present invention are configured by separate sirocco fans, etc., and the amount of air supplied into the house (1) is larger than the amount of exhaust by controlling the air volume of each fan by the controller. It may be made to become.

    The total heat exchanger (87) exchanges heat between intake air and exhaust air, and constitutes a heat exchanger according to the present invention. The total heat exchanger (87) has a vent hole through which the intake air taken from the outside into the flow passage (14) can flow and a vent hole through which the exhaust air taken from the room into the exhaust passage (85) can flow. It is partitioned. In the total heat exchanger (87), both sensible heat and latent heat of the intake air and the exhaust air from the room exchange heat. That is, the total heat exchanger (87) constitutes an air conditioning means for adjusting both the temperature and humidity of the intake air.

-Driving action-
When the ventilator (10) is operated, the centrifugal fan (82) is driven. Thereby, outdoor air is taken into the flow passage (14) in the casing (11), while indoor air (exhaust air) is taken into the exhaust passage (85). The intake air passes through the dust collection unit (20) and then passes through the total heat exchanger (87). For example, in summer, the intake air flowing through the total heat exchanger (87) is cooled by the exhaust air on the exhaust passage (85) side. In addition, moisture in the intake air is imparted to the exhaust air on the exhaust passage (85) side. As a result, relatively low temperature and low humidity intake air can be supplied into the house (1) as process air. For example, in winter, the intake air flowing through the total heat exchanger (87) is heated by the exhaust air on the exhaust passage (85) side. Further, moisture in the exhaust air on the exhaust passage (85) side is imparted to the intake air. As a result, relatively high temperature and high humidity intake air can be supplied into the house (1) as process air.

    The spray unit (30) sprays water containing hydrogen peroxide generated by the discharge device (60) toward the filter (81). Thereby, in the filter (81) in which dust is collected, bacterial residue or propagation can be suppressed.

-Effect of Embodiment 4-
According to the fourth embodiment, the capacity of the upper fan (82a) is made larger than that of the lower fan (82b) so that the intake amount of outdoor air is larger than the exhaust amount of indoor air. For this reason, since the air pressure in the house (1) is higher than the outside air pressure, it is possible to prevent outside air from entering the house (1) through a gap or the like. Thereby, intrusion of dust or the like contained in the outside air into the room can be prevented.

    Moreover, since the total heat exchanger (87) is provided, the humidity can be adjusted at the same time as the heat exchange between the outdoor air and the indoor air. Thereby, the temperature and humidity in the house (1) can be adjusted. Other configurations, operations and effects are the same as those of the third embodiment.

<Other embodiments>
The present invention may be configured as follows with respect to the above embodiment.

<Discharge unit configuration>
The power supply unit (70) of each embodiment described above uses a constant power control unit that controls the discharge power of the streamer discharge to be constant. However, instead of the constant power control unit, a constant current control unit for controlling the discharge current at the time of streamer discharge to be constant may be provided. When this constant current control is performed, the discharge is stabilized regardless of the water conductivity, so that the occurrence of sparks can be avoided.

    In each of the above-described embodiments, the discharge electrode (64) is connected to the positive electrode of the power supply unit (70), and the counter electrode (65) is connected to the negative electrode of the power supply unit (70). However, by connecting the discharge electrode (64) to the negative electrode of the power supply unit (70) and connecting the counter electrode (65) to the positive electrode of the power supply unit (70), so-called between the electrode pair (64,65). Negative discharge may be performed.

<Configuration of ion supply unit>
In each embodiment mentioned above, copper ion can be supplied by using a part of water storage tank (61) as a copper member. However, for example, an iron member that generates iron ions can be used. Since iron ions, like copper ions, promote the Fenton reaction in the presence of hydrogen peroxide, the amount of hydroxyl radicals generated can be increased. Further, for example, by immersing a copper piece or an iron piece in the water storage tank (61), ions can be supplied by these.

    In the above embodiment, the spray unit (30) is used as the supply device. However, the supply device of the present invention is not limited to this, and can be applied to other supply devices.

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

    As described above, the present invention is useful for a ventilation device for plant cultivation facilities.

DESCRIPTION OF SYMBOLS 1 House 11 Casing 12 Intake port 13 Outlet 15 Blower fan 20 Dust collection unit 22 Charging part 25 Dust collection part 30 Spray unit 61 Water storage tank 64,65 Electrode pair 64 Discharge electrode 65 Counter electrode 70 Power supply part 81 Filter 82 Centrifugal fan 82a Upper fan 82b Lower fan 83 Exhaust air inlet 84 Exhaust air outlet

Claims (5)

A casing (11) in which an outdoor air inlet (12) and an air outlet (13) are formed, and an inlet fan (15, 82a) accommodated in the casing (11);
A plant that takes in the outdoor air from the suction port (12) into the casing (11) by the suction fan (15, 82a), processes the intake air, and supplies treated air to the room from the blowout port (13) A ventilation device for cultivation facilities,
A dust collector (20) provided in the casing (11) for removing dust in the intake air;
A water storage tank (61) for storing water, an electrode pair (64,65) for generating a streamer discharge in the water of the water storage tank (61), and a DC power source for applying a DC voltage to the electrode pair (64,65) ( 70), and a discharge device (60) for generating hydrogen peroxide in the water of the water storage tank (61) by the streamer discharge;
A ventilation device for a plant cultivation facility, comprising a supply device (30) for supplying water containing hydrogen peroxide in the water storage tank (61) to the dust collector (20). In claim 1,
The casing (11) is formed with an exhaust air inlet (83) for taking in indoor air and an exhaust air outlet (84) for exhausting the indoor air, while the indoor air taken in from the exhaust air inlet (83) An exhaust fan (82b) exhausted from the exhaust outlet (84) is housed inside,
The suction fan (15, 82a) and the exhaust fan (82b) are configured so that the intake amount of outdoor air is larger than the exhaust amount of the indoor air. apparatus. In claim 2,
A ventilation device for plant cultivation facilities, comprising a heat exchanger (87) provided in the casing (11) for exchanging heat between the taken-in indoor air and outdoor air. In any one of Claims 1-3,
The dust collector (20) includes a charging unit (22) for charging dust in the intake air, and a dust collecting unit (25) for electrically collecting dust charged by the charging unit (22). With
The said supply apparatus (30) is comprised so that the water containing hydrogen peroxide may be supplied with respect to the said dust collection part (25), The ventilation apparatus for plant cultivation facilities characterized by the above-mentioned. In any one of Claims 1-3,
The dust collector (20) includes a filter member (81) for capturing dust in the intake air,
The said supply apparatus (30) is comprised so that the water containing hydrogen peroxide may be supplied with respect to the said filter member (81), The ventilation apparatus for plant cultivation facilities characterized by the above-mentioned.

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