JP5503191B2 - Outside air purification device - Google Patents

Description

  The present invention relates to an outside air purification device, and more particularly to a configuration of an outside air purification device in which a main exhaust fan is installed on a downstream side of an air purification means.

  The outside air contains particulate substances such as pollen and dust, and gaseous chemical substances such as nitrogen oxides, sulfur oxides, and malodorous components. In order to remove indoor air pollutants generated from these outdoor air-derived pollutants and residential building materials, an outside air purification apparatus using water is known.

  The outside air purification system described in Non-Patent Document 1 has a double housing structure including an internal housing in which an outside air purifying unit is housed and an external housing that covers the internal housing. Air flows in from the outside air inlet provided on the upper side surface of the external housing, falls in the space between the external housing and the internal housing, and enters the internal housing from the air intake portion provided on the lower side surface of the internal housing. Flows into the inside. Since the main exhaust fan is provided in the upper part of the internal casing, air is drawn by negative pressure, and the interior of the internal casing rises from the air intake portion toward the main exhaust fan. A circulation tank in which water is stored is provided at the bottom of the inner casing, and the water is sprinkled by a pump to a gas-liquid contact section provided in the inner casing. The air rising from below makes gas-liquid contact at the gas-liquid contact portion, and particulate matter and gaseous chemical substances in the outside air are removed. Since the purified air passes through the gas-liquid contact portion and becomes high humidity, the humidity is adjusted by a humidity control mechanism using a desiccant rotor and is discharged from the internal housing by the main exhaust fan. The air is further discharged to the outside from the air outlet of the outer casing through a duct connecting the inner casing and the outer casing.

  Such an outside air purification device does not require maintenance such as replacement and regeneration of the filtration filter and adsorbent provided in the conventional outside air purification device, and can easily maintain the necessary purification performance. Moreover, since the main exhaust fan is installed in the downstream of the gas-liquid contact part, the purified air is sent to the main exhaust fan. For this reason, the contamination of the main exhaust fan is minimized.

Masashi Fujita and two others, “Development of a home introduction outdoor air purification system using water”, Proceedings of the Air Conditioning and Sanitary Engineering Conference, August 27, 2008, p. 1257-1260

  In general, it is sufficient that the inner casing defines an air flow path and can accommodate necessary equipment such as a gas-liquid contact portion, a circulation tank, and a humidity control mechanism. Moreover, it is desirable that the internal housing can be easily disassembled for installation of equipment and internal maintenance. For these reasons, the internal casing is configured to assemble a plurality of metal frames by a simple method such as bolting. For this reason, the airtightness of the internal housing is not necessarily sufficient. By the way, since the main exhaust fan is installed on the downstream side of the gas-liquid contact portion, the inner side of the inner casing has a negative pressure. For this reason, the air flowing in from the outside air inlet is attracted not only by the air intake portion of the internal housing but also by the negative pressure of the internal housing, and flows into the internal housing from the joint of the internal housing. As a result, a phenomenon occurs in which unpurified air bypasses the air purifying means, and a mixed gas of purified air and unpurified air is discharged from the main exhaust fan, and air purification performance deteriorates. Furthermore, the effect of installing the main exhaust fan on the downstream side of the gas-liquid contact portion in order to minimize the contamination of the main exhaust fan is reduced.

  An object of the present invention is to provide a structure capable of suppressing deterioration of air purification performance and contamination of a main exhaust fan in an outside air purification apparatus in which the main exhaust fan is installed downstream of the air purification means. .

In order to solve the above-described problems, an outside air purification device of the present invention includes an air intake unit and an air extraction unit, an air purification unit that purifies air introduced from the air intake unit, an air purification unit, and an air extraction unit. A main exhauster that discharges purified air to an air take-out part, an outer housing that contains an outside housing that includes an outside air inlet and an air outlet, and surrounds the inside housing An air introduction path connecting the outside air introduction port and the air intake portion is formed in the space between the outer surface of the inner housing and the inner surface of the outer housing, and the air discharge port takes out air through the first duct. An outer casing that is in direct communication with the section, and negative pressure forming means for maintaining the space between the casings at a negative pressure. The negative pressure forming means is an auxiliary exhaust device that is installed in the space between the enclosures and exhausts a part of the air flowing in from the outside air introduction port to the outside of the outer enclosure.

  In the outside air purification apparatus configured as described above, air flows from the outside air introduction port of the outer housing, passes through the space between the housings, and is introduced into the inner housing from the air intake portion of the inner housing. By the main exhaust fan located between the air purification means and the air extraction part, the inside of the inner casing is maintained at a negative pressure state at least between the air purification means and the main exhaust fan. Further, the negative pressure is maintained by the negative pressure forming means. Therefore, unpurified air can be prevented from flowing from the space between the enclosures to the downstream side of the air purification means through the joint of the internal enclosure, and deterioration of the air purification performance can be suppressed. Moreover, since it becomes difficult for a main exhaust fan to contact directly with unpurified air, it becomes easy to suppress the contamination of a main exhaust fan.

  As described above, according to the present invention, in the outside air purification device in which the main exhaust fan is installed on the downstream side of the air purification means, the inflow of unpurified air to the downstream side of the air purification means is suppressed. Deterioration of air purification performance and contamination of the main exhaust fan can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of 1st Embodiment of the external air purification apparatus of this invention. It is a typical perspective view which shows the outline | summary of a desiccant rotor. It is a schematic diagram which shows the structure of 2nd Embodiment of the external air purification apparatus of this invention. It is a schematic diagram which shows the structure of 3rd Embodiment of the external air purification apparatus of this invention. It is a schematic diagram which shows the structure of 4th Embodiment of the external air purification apparatus of this invention.

  Hereinafter, a first embodiment of an outside air purification apparatus of the present invention will be described with reference to the drawings.

  The outside air purification apparatus 1 includes an inner casing 2 and an outer casing 3 that surrounds and accommodates the inner casing 2. The inner housing 2 is a housing that defines an air flow path and accommodates the equipment described below. The inner casing 2 is preferably made of metal, but other materials such as resin can be used as long as appropriate strength can be secured. The inner casing 2 has a structure that can be disassembled for installation and maintenance of the equipment inside the inner casing 2. The structure is not particularly limited as long as the installation and maintenance of the equipment is possible, and may be a form in which a plurality of metal frames are connected to each other vertically, or a form in which each surface of the inner casing 2 is constituted by separate metal plates. . In order to make the structure decomposable, it is desirable that these metal frames or metal plates can be separated from each other by bolts or the like.

  A circulation tank 4 that constitutes a part of the air purification means 5 is installed at the bottom of the inner casing 2, and above that, a packed tower 13 and a watering nozzle 14 that constitute another part of the air purification means 5, 1 heat exchanger 6, a desiccant rotor 7 (humidity adjusting means), a second heat exchanger 8, and a main exhaust fan 9 are installed in this order. An air intake portion 21 is provided on the lower side surface of the inner housing 2, and an air extraction portion 22 is provided on the upper side surface, and the air introduced from the air intake portion 21 is given a driving force by the main exhaust fan 9. Flows from the bottom to the top toward the air outlet 22. A space from the air intake unit 21 to the air extraction unit 22 in which air flows upward is hereinafter referred to as an outside air processing space 23.

  The outer casing 3 is provided for the purpose of preventing splashing of cleaning water to the outside of the apparatus, protecting the inner casing 2, and imparting a suitable appearance. An outside air introduction port 31 is provided on the upper side surface of the outer casing 3, and an air discharge port 32 is provided on the upper side surface on the opposite side. The air discharge port 32 may be connected to a duct (not shown) extending to the supply destination of the purified air.

  Between the outer surface 2 a of the inner housing 2 and the inner surface 3 a of the outer housing 3, an inter-housing space 11 is formed. The inter-body space 11 constitutes an air introduction path that connects the outside air introduction port 31 and the air intake portion 21. The air discharge port 32 communicates directly with the air extraction portion 22 through the duct 12 without passing through the inter-frame space 11.

  Air is introduced from the outside air inlet 31 of the outer casing 3, descends the inter-body space 11 that functions as an air introduction path, and is introduced into the inner casing 2 from the air intake portion 21 of the inner casing 2. Air that has undergone air conditioning such as purification and humidity adjustment is discharged from the air take-out portion 22 of the inner housing 2 and purified from the air discharge port 32 of the outer housing 3 through the duct 12 that connects the inner housing 2 and the outer housing 3. It is discharged to the outside of the device 1.

  Hereinafter, each element of the outside air purification apparatus 1 will be described in more detail.

  The air purifying means 5 purifies the air introduced from the air intake 21 into the inner casing 2 by bringing it into contact with the washing water. For this reason, the air purifying means 5 circulates the washing water, the packed tower 13 constituting the gas-liquid contact portion, the circulation tank 4 for storing the washing water, the watering nozzle 14 provided above the filling tower 13, and the washing water. And a circulation pump 15.

  The packed tower 13 is filled with Raschig rings. Other fillers that are commonly used in packed towers, such as a lessing ring, a pole ring, a saddle, and a sulzer packing, can also be used. A plate column can be used instead of the packed column 13. The washing water sprayed from the water spray nozzle 14 adheres to the surface of the Raschig ring, and the gas-liquid contact with the air rising from below is performed on the surface of the Raschig ring.

  The circulation tank 4 is provided at the bottom of the inner casing 2 and is connected to the circulation pump 15 via a pipe 51 provided on the side surface. A heater 10 for adjusting the water temperature is provided inside the circulation tank 4 and is connected to an external heat source 17. The heater 10 is used, for example, for preventing freezing of washing water in winter. A drain port 18 for draining water is provided on the bottom surface of the circulation tank 4. Washing water can be replenished and replaced from the external water source 19 through the pipe 52 under the control of the valve 71.

  The discharge side of the circulation pump 15 is connected to the watering nozzle 14 via pipes 53 and 54. The watering nozzle 14 is, for example, a pipe having a large number of holes, and the cleaning water is sprinkled into the packed tower 13 through the holes. The shape of the pipe is not particularly limited, and any shape of pipe such as a plurality of straight or concentric pipes or spiral pipes can be selected as long as the washing water is uniformly sprinkled into the packed tower 13. The watering nozzle 14 can be appropriately used from known watering nozzles such as a sprinkler, a shower, a sprinkler, and a spray type, but is preferably a spray type. In the spray type, the sprayed water is mist-like and the particle size is fine. Therefore, not only can the filler in the packed tower 13 be wetted efficiently, but the mist-like water sprayed from the spray itself can contact the treated air and purify the treated air. The liquid contact efficiency is increased. Moreover, since water can be sprayed over a wide area from one nozzle, the number of parts can be reduced.

  A first heat exchanger 6 (temperature adjusting means) is provided above the air purification means 5. The first heat exchanger 6 uses the wash water of the circulation tank 4 as a heat exchange medium via the pipes 53 and 55. The temperature of the air purified by the air purification means 5 is adjusted by the first heat exchanger 6 to achieve an appropriate supply air temperature. By appropriately controlling the water temperature in the circulation tank 4, the purified air is cooled in summer and the purified air is heated in winter. The wash water heat-exchanged by the first heat exchanger 6 is collected in the circulation tank 4 via the pipes 56 and 57. Note that the external water source 19 can be used as the heat exchange medium, and the circulation tank 4 and the external water source 19 can be appropriately switched according to the water temperature by controlling the valve 72.

  Humidity adjusting means is provided above the first heat exchanger 6. Since the air purified by the gas-liquid contact method contains a large amount of moisture, the moisture is removed by the humidity adjusting means. In this embodiment, the desiccant rotor 7 is used as the humidity adjusting means. FIG. 2 shows a conceptual perspective view of the desiccant rotor 7. A desiccant (not shown) is held in the rotating rotor 71 of the desiccant rotor 7, and a certain angular range α is a moisture absorption region 72 with respect to the rotation center C-C of the rotor 71. The air containing a large amount of moisture that has passed through the air purifying means 5 is drawn upward (direction D1) to the moisture absorption region 72, and passes through the rotor 71 in the thickness direction of the rotor 71, and enters the inside of the rotor 71. Moisture is absorbed by the retained desiccant. On the other hand, the remaining angle range β is a regeneration region 73, and high-temperature air from the regeneration heater 16 is blown downward (direction D2) to the moisture-absorbing desiccant to remove moisture contained in the desiccant. . Since the rotor 71 rotates at a constant rotational speed, each angular position of the rotor 71 is switched between the moisture absorption area 72 and the regeneration area 73 at regular intervals. Since the regeneration heater 16 is housed in the regeneration heater chamber 24 that is spatially separated from the outside air processing space 23, the regeneration high temperature air does not come into contact with the desiccant that is absorbing moisture.

  For the high-temperature air for regeneration of the desiccant rotor, a part of the dried air that has exited the desiccant rotor 7 is taken into the regeneration heater chamber 24 by the branch fan 41, and the air taken into the regeneration heater chamber 24 is used for regeneration of the regeneration heater chamber 24. It is obtained by heating with the heater 16. Part of the moisture of the desiccant rotor 7 absorbed by the high-temperature air is collected in the packed tower 13 and reused as washing water. The rest is returned to the regenerative heater chamber 24, a part of which is released to the atmosphere, and the rest is recovered by the heat source 17 to reuse the waste heat, and is used to adjust the temperature of the wash water in the circulation tank 4.

  A second heat exchanger 8 (temperature adjusting means) is provided on the upper portion of the desiccant rotor 7. Similar to the first heat exchanger 6, the second heat exchanger 8 uses the wash water of the circulation tank 4 as a heat exchange medium via the pipes 53 and 58. Since the temperature of the air whose humidity has been adjusted by the desiccant rotor 7 rises due to various factors, the temperature is further adjusted by the second heat exchanger 8 to achieve an appropriate supply air temperature. As factors for the temperature rise of the air, heat generation due to the operation of the main exhaust fan 9 and the branch fan 41 and adsorption heat of the desiccant rotor 7 (adsorption heat generated during water absorption) can be considered. The influence of the regenerating operation of the desiccant rotor 7 is also conceivable. That is, the moisture absorption area 72 of the desiccant rotor that has absorbed moisture in the outside air processing space 23 enters the regeneration heater chamber 24 by the rotation of the desiccant rotor 7 to become the regeneration area 73, is heated and regenerated in the regeneration heater chamber 24, and enters the outside air treatment space 23. Returning to the moisture absorption region 72 again, in the course of such a regeneration operation, heat is entrained from the regeneration heater chamber 24 to the outside air treatment space 23, so that the air is warmed. The wash water heat-exchanged by the second heat exchanger 8 is collected in the circulation tank 4 via the pipes 59 and 57. As the heat exchange medium, an external water source 19 can be used as in the first heat exchanger 6.

  The main exhaust fan 9 is installed above the air purifying means 5, the desiccant rotor 7, and the first and second heat exchangers 6, 8 and in front of the air extraction unit 22. It discharges to the take-out part 22.

  The inter-body space 11 is provided with negative pressure forming means for maintaining the inter-body space 11 at a negative pressure. The negative pressure forming means only needs to be able to maintain the negative pressure in at least the region 43 between the outside air inlet 31 and the air intake portion 21 in the inter-body space 11. As the negative pressure forming means, for example, a small auxiliary exhaust fan 42a can be used. The auxiliary air exhaust 42 a is provided in a region 43 between the outside air introduction port 31 and the air intake part 21, and a part of the air flowing in from the outside air introduction port 31 is exhausted to the outside of the outer casing 3. As a result, the region 43 between the outside air inlet 31 and the air intake 21 is in the third type ventilation state, and the region 43 of the inter-body space 11 can be maintained at a negative pressure. If a large-capacity exhaust fan is used as the negative pressure forming means, most of the air introduced from the outside air inlet 31 is exhausted as it is, which may hinder the supply of air to the inner housing 2. As the negative pressure forming means, it is desirable to use a small capacity exhaust fan. Although the outside air processing space 23 of the inner housing 2 is negative pressure due to the operation of the main exhaust fan 9, the region 43 of the inter-body space 11 is also maintained at a negative pressure. The inflow of unpurified air into the outside air processing space 23 of the housing 2 is suppressed. In particular, it is preferable that the negative pressure on the outlet side of the packed tower 13 and the negative pressure in the space 11 between the outer sides of the packed column 13 substantially coincide. As a result, mixing of the purified air and unpurified air is prevented, and the backflow of the purified air to the inter-body space 11 is also prevented, so that a reduction in air purification performance is suppressed. Further, the purified air is further subjected to humidity adjustment and temperature adjustment to become air of appropriate temperature and humidity, but humidity adjustment performance and temperature adjustment performance due to air in the interframe space 11 being mixed into the inner housing 2. Is also prevented. Furthermore, by providing the auxiliary exhaust fan 42a, it is possible to exhaust the heat generated inside the inner casing 2 through the inter-frame space 11, and the first heat exchanger 6 and the second heat exchange. The heat exchange capacity of the vessel 8 can be reduced.

  In FIG. 3, the outline | summary of 2nd Embodiment of the external air purification apparatus of this invention is shown. This embodiment is the same as the first embodiment except for the configuration of the negative pressure forming means. In the present embodiment, the negative pressure forming means is an auxiliary blower 42 b that is installed in the inter-body space 11 and pushes the air that flows in from the outside air introduction port 31 into the inner housing 2 from the air intake portion 21. Since the entire amount of air introduced from the outside air inlet 31 can be supplied to the inner casing 2, the purification efficiency of the outside air is increased. In this embodiment, the inter-body space 11 is in a state corresponding to the third type ventilation as in the first embodiment, but the outside air treatment space 23 has increased pressure in the region on the inlet side of the packed tower 13. It is in a state close to the first type ventilation. For this reason, the pressure on the outlet side of the packed tower 13 is also higher than in the first embodiment, and the inflow of untreated air into the inner casing 2 can be more reliably suppressed.

  In FIG. 4, the outline | summary of 3rd Embodiment of the external air purification apparatus of this invention is shown. This embodiment is the same as the first embodiment except for the configuration described below. The inter-body space 11 is provided with a duct 61 that connects the outside air inlet 31 and the air intake 21 as an air introduction path. The outer casing 3 is formed with an opening 3b such as a small hole and a slit that communicates the inner surface 3a and the outer surface 3d of the outer casing 3. The untreated air is sent directly from the outside air inlet 31 to the air intake unit 21 without passing through the inter-frame space 11. On the other hand, when the auxiliary exhaust fan 42a operates, air flows into the inter-frame space 11 from the outside of the outer casing 3 through the opening 3b and is discharged by the auxiliary exhaust fan 42a. As a result, the inter-frame space 11 becomes a negative pressure with respect to the external space of the outer casing 3 by the amount of pressure loss in the opening 3b. The size and number of the openings 3b are set so that the space 11 between the bodies is maintained at a necessary negative pressure and the capacity and power cost of the auxiliary exhaust fan 42a are not excessive.

  In FIG. 5, the outline | summary of 4th Embodiment of the external air purification apparatus of this invention is shown. This embodiment is also the same as the first embodiment except for the configuration described below. In the present embodiment, as in the third embodiment, a duct 61 that connects the outside air inlet 31 and the air intake portion 21 is provided as an air introduction path. Unlike the third embodiment, an opening 3c such as a small hole is formed in the outer housing 3, and the opening 3c and a duct 62 connected downstream of the air discharge port 32 are connected to a flow path such as a pipe or a duct. 63 is connected. Only the purified and humidity-adjusted air is introduced into the inter-body space 11. For this reason, even if the air in the inter-body space 11 flows into the internal housing 2, there is no adverse effect on the air in the internal housing 2 or the air after the processing. In the present embodiment, it is only necessary to provide a means for returning the purified air to the inter-body space 11 on the downstream side of the air extraction unit 22. That is, it is only necessary that the flow path on the downstream side of the air extraction portion 22 and the inter-body space 11 are connected by a predetermined flow path. Therefore, instead of providing the duct 62, for example, an opening may be provided in a part of the duct 12 so that the duct 12 and the inter-frame space 11 communicate directly.

  In the present embodiment, an opening 3b that communicates the inner surface 3a and the outer surface 3d of the outer casing 3 may be further formed, as in the third embodiment. In this case, an air-fuel mixture of untreated air and treated air is discharged by the auxiliary exhaust fan 42a. Since the air in the inter-body space 11 is in a better state than the untreated outside air by introducing purified and humidity-adjusted air, the air in the inter-body space 11 is Even if it flows into (a section on the downstream side of the air intake portion 21), adverse effects on the air being processed in the internal housing 2 or the air after the processing are reduced.

DESCRIPTION OF SYMBOLS 1 Outside air purification device 2 Inner housing 3 Outer housing 4 Circulating tank 5 Air purification means 6 First heat exchanger 7 Desiccant rotor (humidity adjustment means)
DESCRIPTION OF SYMBOLS 8 2nd heat exchanger 9 Main blower 11 Space between frames 13 Packing tower 14 Sprinkling nozzle 15 Circulation pump 21 Air intake part 22 Air extraction part 31 Outside air introduction port 32 Air discharge port 42a Auxiliary exhaust fan (negative pressure formation means)
42b Auxiliary blower (negative pressure forming means)

Claims (7)

And an air purifying unit that purifies the air introduced from the air intake unit, and the purified air positioned between the air purification unit and the air extraction unit. A main blower that discharges to the take-out section;
An outer housing that includes an outside air inlet and an air outlet, and that accommodates the inner housing, wherein the outside air inlet and the air intake are inserted into a space between the outer surface of the inner housing and the inner surface of the outer housing. An air introduction path is formed to connect the air outlet, and the air outlet is in direct communication with the air outlet through a first duct ;
Negative pressure forming means for maintaining at least a region between the outside air introduction port and the air intake portion in the space between the enclosures, and
I have a,
The negative pressure generating means, wherein disposed in the housing between the space, wherein a portion of the air flowing from the air introduction port Ru auxiliary exhaust fan der for exhausting to the outside of the outer casing, the outside air purifier. The space between the enclosures is provided with a second duct connecting the outside air introduction port and the air intake portion as the air introduction path, and the outer enclosure communicates the inner surface and the outer surface of the outer enclosure. The outside air purification apparatus according to claim 1 , wherein an opening is provided. The space between the casings is provided with a second duct that connects the outside air inlet and the air intake part as the air introduction path, and the flow path on the downstream side of the air extraction part and the space between the casings The outside air purification apparatus according to claim 1 , wherein a flow path for connecting the two is provided. The outside air purification apparatus according to any one of claims 1 to 3 , wherein the air purification means includes a gas-liquid contact portion that brings the air introduced from the air intake portion into contact with cleaning water. The outside air purification apparatus according to claim 4 , wherein the inner casing accommodates a humidity adjusting means positioned between the main exhaust fan and the air purification means. The outside air purification device according to claim 5 , wherein the humidity adjusting means is a desiccant rotor. The outside air purification apparatus according to any one of claims 1 to 6 , wherein the inner casing accommodates a temperature adjusting means positioned between the main exhaust fan and the air purification means.

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