JP6874025B2 - Clean outside air supply device - Google Patents

Description

Regarding air conditioning technology. In particular, it is a technology that purifies the air taken in from the outdoors.

Construction work such as demolition of the building may be carried out next to the building in use. In the construction area, an enclosure is provided to prevent dust from scattering and soundproofing measures are taken, but dust is not a little scattered.
In particular, prevention of infectious diseases caused by fungi such as Aspergillus is a major issue during the dismantling and renovation work of hospitals. Fungal spores such as Aspergillus pose an important risk. It is known that when immunocompromised patients inhale a large amount of aspergillus spores scattered during construction, they are more likely to develop invasive pulmonary aspergillosis and have a high case fatality rate.
During the dismantling work, dust measures such as sprinkling water and installing a dustproof sheet are taken, but a part of the dust generated in large quantities diffuses, and the outside air intake of the surrounding hospital contains dust with a higher concentration than the general atmosphere. Air may be inhaled, which puts a load on the hospital filter.
Each room in the hospital is classified according to the operating room, ICU, general hospital room, etc., and it is required to maintain the air cleanliness suitable for the purpose, created by the Japan Medical Welfare Equipment Association. The hospital equipment design guidelines (Non-Patent Document 1) have been widely used. Each room is classified into cleanliness class, and the ventilation conditions such as the minimum air volume (outside air volume and indoor circulation air volume), room pressure (positive pressure or negative pressure), efficiency of the final air supply filter, etc. are shown. There is. Therefore, the air-conditioning intake port corresponding to the air-conditioning may be provided in the building.
Hospital air conditioning equipment must maintain the air quality conditions required for health, safety and pleasure. The amount of outside air and the amount of circulating air in the room required to satisfy the air quality conditions in each room are indicated and need to be maintained.

Since air conditioning is finely controlled in operating hospitals, it is difficult for the operating hospitals to take measures against dust and mold caused by demolition work due to various restrictions. For example, construction must be done in operating hospitals (each building unit including medical wards and wards), increased pressure loss due to the installation of dust and mold removal means such as filters, increased existing fan capacity, and noise.・ Vibration countermeasures and removal after dismantling work have a considerable impact not only on facility management but also on medical activities and patients. Therefore, it is necessary to take measures against dust and mold derived from demolition work that does not burden the hospital.

Hospital Equipment Design Guidelines (Air Conditioning Equipment) 2013.10.28 Japan Medical Welfare Equipment Association New Nosocomial Infection Prevention Measures Handbook 2007.2.20 Edited by ICHG Study Group, Infection Control Committee, National Hospital Organization Osaka Medical Center

The subject is to prevent the outside air containing dust and fungi from the dismantling work of hospitals and the like from affecting the intake air on the side of adjacent buildings such as operating hospitals.

1. 1. It is an outside air supply device equipped with a blower equipped with a filter facing the outside air and an outside air intake mechanism.
The outside air intake mechanism is equipped with an outside air introduction part for introducing untreated outside air and a blower adjustment damper provided between the ducts.
One end of the duct of the outside air intake mechanism is connected to the blower side, and the other end is connected to the intake port side of the building.
The blower adjustment damper adjusts the opening degree of the clean air blower path and the outside air introduction section where the air that has passed through the filter from the blower flows, and is a rotatable air volume control that opens and closes the clean air blower path and the outside air introduction section. An outside air supply device having a plate, wherein the air volume control plate is rotated by wind pressure.
2. 1 which is a temporary device for use during the construction of the adjacent building buildings having an inlet. The described outside air supply device.
3. 3. The air volume control plate includes a clean air control plate that opens and closes the clean air air passage and an outside air control plate that opens and closes the outside air introduction part.
The clean air control plate is characterized by having a small opening with a backflow prevention opening / closing plate. Or 2 . The described outside air supply device.
4 . The blower is characterized by including a base having an anti-vibration stand, a fan drive motor, a fan, and a filter. ~ 3 . The outside air supply device according to any one of.
5 . 1. 1. ~ 4 . The outside air supply device according to any one of, during the construction of the adjacent building performs large volume operation exceed the amount of intake air of the building, during construction resting adjacent building performed Teikazeryou operation, is under construction was purified A method of supplying outside air to a building, characterized in that air is supplied to the intake port of the building and the driving noise of an outside air supply device entering from the intake port of the building is reduced during construction suspension.

1. 1. In the outside air supply device of the present invention, the outside air containing dust, fungi, etc. associated with the demolition work of a hospital or the like takes in the outside air without affecting the intake air on the side of the adjacent building such as an operating hospital. can do. The outside air supplied is clean air that has passed through the filter during construction, and is a mixture of clean air and untreated air during construction suspension such as at night when dust is not generated, so dust and fungi associated with construction The outside air including the above is not taken into the building.
2. By providing an air volume control plate that rotates by wind pressure and can adjust the opening of the air passage, the air pressure of clean air and untreated air is used, so the air volume control plate does not require power such as a motor, and the blower can operate. The amount of intake air in the building can be secured even if an emergency stop is made.
3. 3. By adjusting the opening of the clean air air passage and operating the blower at a low air volume during the construction suspension, the untreated outside air does not flow back to the blower side, and the untreated outside air contains dust and fungi. Even if it does, it will not contaminate the filter on the blowout side of the blower. Then, by operating with a low air volume, it is possible to reduce the influence of the rotation noise of the motor and the wind noise accompanying the blowout on the interior of the building directly or through the intake port. In particular, it is possible to maintain quietness at night and provide an environment in which nervous inpatients and the like can maintain rest. Quietness is further improved by using a soundproof blower. For example, it is possible to suppress an increase in the number of times of getting on and off the bed and the number of toilets due to poor sleep of the inpatient and the inability to obtain good sleep, and an increase in the risk due to a fall. It is possible to prevent an increase in the burden on nurses due to the behavior of these patients.
4. Therefore, according to the present invention, the outside air in the state before the construction can be supplied to the operating building, the influence of the noise due to the outside air supply is reduced, and the blower (particularly, the downstream surface of the filter) is not backflow contaminated. Secondary pollution can also be prevented. In particular, it is possible to safely carry out rebuilding and renovation work of hospitals that require strict management.
Further, since this outside air supply device has a simple mechanism, it can be realized at low cost, and since it can be implemented without using electricity other than a fan, it is not easily affected by rainfall and temperature.
5. The outside air supply device of the present invention performs a large air volume operation exceeding the intake air volume of the building during construction (the large air volume is an amount that secures a situation where at least the static pressure at the connection with the intake port becomes +). , Purified air is supplied to the building intake port 110 during construction, and low air volume operation is performed during construction suspension to prevent the filter side of the blower from being contaminated with outside air, and the outside air entering from the building intake port 110. Realize a method of supplying outside air to a building where the driving noise and vibration of the supply device are reduced. As a result, it is possible to prevent contamination of the operating hospital adjacent to the hospital to be constructed and to maintain the quietness in the hospital during the construction suspension period such as at night. During construction suspension, the same outside air as normal outside air is taken in, so it is possible to sufficiently take measures against external pollution with the normal air conditioning equipment of an operating hospital.

Example of outside air supply device Example of outside air intake mechanism Other examples of outside air supply equipment The figure which shows the example of the air volume control board Arrangement example of outside air introduction part The figure which shows the example which made the air volume control board a double structure The figure which shows another example which made the air volume control board a double structure The figure which shows the example of the outside air supply device which arranged the clean air air passage and the outside air introduction part in series. The figure which shows the installation example of the outside air supply device

The present invention is an outside air supply device that prevents outside air containing dust, fungi, etc. associated with demolition work of a hospital or the like from affecting the intake air on the building side of an operating hospital or the like. During construction, clean air that has passed through the filter can be supplied, and during construction suspension such as at night when dust is not generated, mixed air of clean air and untreated air can be supplied to the operating building, so dust from construction can be supplied. It is a device that does not allow outside air containing dust and fungi to be taken into the building. In this patent application, the hospital refers to the building of each building including the ward and the clinic.
The outside air supply device of the present invention includes a blower provided with a filter and an outside air intake mechanism for connecting the blower and the intake port of the building. The outside air intake mechanism is provided with an outside air introduction part and a blower adjustment damper provided between the ducts, and this blower adjustment damper depends on the amount of clean air supplied to the intake port of the building and the amount of untreated outside air. It functions to adjust the opening of the clean air air passage and the outside air introduction section. The blower adjustment damper is a mechanism that is composed of a plate-like body or the like that is attached to the rotation shaft in a rotation-free manner, and the rotation angle is changed by the wind pressure of clean air and the wind pressure of untreated outside air.
The amount of air sucked into the building is determined by the intake fan of the air conditioner installed on the building side, and if the amount of clean air supplied by the blower exceeds the amount of air required by the building, the air blown from the blower is sufficient. .. That is, the air supply is maintained so that the static pressure at the connection portion with the intake port becomes + by the supplied air. However, the blower generates motor noise and vibration noise, which may cause discomfort to the residents in the building at night and the like. In particular, inpatients may not be able to keep their rest, so it is desirable to operate or stop the operation of the blower at night, etc., and the amount of air required for intake of the insufficient building is untreated outside air. I need to make up for it. If the operation of the blower is stopped, fungi contained in the outside air may adhere to the air outlet and the outlet side of the filter, and if the blower is restarted with the adhered fungus growing, the fungus will be supplied to the building. , May have the opposite effect. Therefore, it is necessary to operate the blower at least at a low air volume at night, etc., but the outside air to make up for the insufficient air volume fluctuates in wind speed and direction, and may fluctuate depending on the installation location, so the amount of outside air introduced is temporary. It becomes excessive for a certain period of time, and there is a concern that the downstream surface of the filter will be contaminated due to backflow. The present invention has developed an adjustment mechanism that supplements the amount of air required for intake of a building with untreated outside air, which is insufficient when operating at a low air volume. Then, we have developed a mechanism that can prevent the influence of backflow due to untreated outside air, which may fluctuate due to the influence of the installation environment, and prevent contamination of the lower surface of the filter.
Since fungi such as mold can invade even a small gap, we are proposing an adjustment mechanism with enhanced invasion prevention function.
The present invention is an outside air supply device that does not adversely affect the intake air of a hospital or the like, which is an operating building in the vicinity of the construction work. In the present invention, when the dust / mold removing means is normally operated during the construction period and the low air volume is operated during the construction suspension, fluctuating outside air is introduced to compensate for the insufficient air volume, and the downstream surface of the filter is contaminated by the backflow of the outside air. It is a device that can prevent and maintain cleanliness.
The present invention is a device that is installed outdoors during demolition work and used temporarily to remove dust and mold and supply air, and realizes a simple mechanism that reduces costs and is less likely to cause failures due to rainfall or temperature. ing.

The blower is equipped with a motor driven fan and filter. As the filter, a fine HEPA filter that filters fungi and bacteria such as mold, a high-performance filter, and a bug filter are used. The gantry and housing are preferably of a quiet type using a vibration-proof structure in order to suppress vibration.

The outside air intake mechanism includes an outside air introduction section for introducing outside air and a blower adjustment damper provided between the ducts.
The duct can be made of a plate-shaped body or a flexible body, but the intermediate portion where the adjusting damper is provided is formed of a plate-shaped body. One end of the duct has a mechanism for connecting to the air outlet of the blower, and the other end has a mechanism for connecting to the air intake of the building. As the connection mechanism, well-known means such as screwing via a flange or a rubber band can be used, but it is preferable that the connection mechanism is brought into close contact with the packing so as not to form a gap.

The outside air introduction portion is formed by providing an opening in the middle of the duct. A duct for introducing outside air can be further connected to the opening. The opening is provided on the side or bottom. If it is installed on the upper surface, it may cause rain to blow in or rainwater to enter, so avoid it.

The adjustment damper is a mechanism that can open and close the clean air air passage or the outside air introduction passage.
As the opening / closing means, means for rotating or sliding the air volume control plate, which is a plate-shaped body having a size capable of closing each ventilation path, can be used.
The rotating means is composed of, for example, a rotating shaft and an air volume control plate which is a plate-like body attached to the rotating shaft so as to be freely rotatable. The rotating shaft is attached to the upstream side of the opening for introducing outside air, and the air volume control plate rotates so that the clean air air passage and the outside air introduction passage can be closed. The height of the air volume control plate is based on the same length as the clean air air passage, and the width is the same as or slightly longer than the clean air air passage so that the air passage can be completely blocked. This size has the same relationship with the outside air introduction path, and the outside air introduction path is designed so that the outside air introduction path can be completely blocked. As the air volume control plate, one or two plates can be installed on the rotating shaft. In the case of two sheets, the plate-shaped body is attached in the shape of a "he" around the rotation axis. The angle between the two plate-like bodies shall be within 90 degrees.
Further, in the rotating means, the air passage can be opened and closed by the divided plate body.
Further, it is also possible to provide a rotating plate body in the front-rear direction and open / close in an interlocking manner.

A receiving structure that is in close contact with the air volume control plate so as not to create a gap can be provided at a position where the air flow path and the outside air introduction path are closed. This receiving mechanism also serves as a stopper for the air volume control plate.
Further, the air volume control plate may be provided with a small opening through which the low air volume passes when the blower has a low air volume. Providing a backflow prevention structure in the small opening further improves the safety of preventing fungal invasion. The backflow prevention structure is simply realized by providing an opening / closing plate larger than the small opening on the downstream side of the opening so as not to open more than 90 °.

(Embodiment 1)
FIG. 1 shows an example of a basic configuration of an outside air supply device. FIG. 1 (a) shows an overall configuration diagram, FIG. 1 (b) shows a schematic diagram of an outside air intake mechanism, and FIG. 1 (c) shows an outline of an equipment configuration of a blower.
The outside air supply device includes a blower 1 and an outside air intake mechanism 2 attached to the blowout side of the blower 1. The outside air intake mechanism 2 has a duct-like shape, one end 31 is attached to the blower 1 side, the blower adjustment damper 5 is in the middle part, and the other end 32 is an intake port from which a building such as a hospital takes in outside air. Connected to 110. The outside air intake mechanism 2 has a tubular shape, a quadrangular or circular cross section, the blower adjustment damper portion may be formed of a plate-like body that does not deform, and the others may be flexible so that they can be easily adjusted. An adjusting device such as a connecting duct may intervene according to the distance from the blower 1 to the outside air intake mechanism 2. The outside air intake mechanism 2 is provided with a blower adjustment damper 5 in the middle of the clean air air passage 33 and the duct 3 inside the duct 3, and the blower adjustment damper 5 has an air volume control plate 51 and an outside air introduction unit 4 that communicates with the outside. There is an opening leading to. The blower 1 includes a motor 13, a fan 14, and a filter 11 on a base 12 as basic components. It is preferable that the motor 13 and the fan 14 are attached via the vibration isolator member 15.

FIG. 2 shows a structural example of the outside air intake mechanism 2 shown in FIG. FIG. 2A shows a plan view, and FIG. 2B shows a three-dimensional structure diagram.
The outside air intake mechanism 2 has a clean air air passage 33 on the upstream side of the air blow adjustment damper 5 in the middle portion, and a supply air passage 36 on the downstream side of the air air adjustment damper 5. The clean air air passage 33 is a portion where clean air that has passed through the filter is sent out from one end 31, and the supply air passage 36 is the other end 32 through which clean air, untreated outside air, or a mixed air of both passes. It is a part that supplies outside air to the intake port 110 of the building.
In this example, the blower adjustment damper 5 includes an air volume control plate 51 provided freely rotatably on a rotation shaft 53 provided along the side wall. There is a clean air side opening 34 on the clean air air passage 33 side of the adjustment damper 5.
An untreated outside air opening 35 is provided on the side wall on the downstream side of the rotating shaft 53, and continues to the outside air introduction portion 4. The air volume control plate 51 can rotate between the clean air side opening 34 and the untreated outside air opening 35, and has a size capable of closing both openings.
The clean air side opening 34 is provided with a direct passage or a receiving portion as it is. The receiving portion can be provided with a stopper with a frame material with packing, a slit material, a mesh material, or the like to provide a detent function and a close contact function. When a packing or the like is provided to provide a close contact function, the function of preventing the invasion of fungi through the gap is improved. The untreated outside air opening 35 can also be provided with a detent function and a close contact mechanism. The untreated outside air opening 35 can be exposed to the outside air as it is, but in this example, the outside air is communicated through the outside air introduction unit 4.

Depending on the rotation position of the air volume control plate 51, air from the clean air side opening 34 and air from the untreated outside air opening 35 are supplied. During construction, the air volume that exceeds the intake air volume required by the building is blown from the blower as a large air volume operation, and the inside of the adjustment duct becomes high pressure due to the air pressure of clean air, so the untreated outside air opening is closed by the air volume control plate 51. It becomes a state.
The three-dimensional configuration of the outside air intake mechanism shown in this plan view is shown in FIG. 2 (b).
In addition to the explanation of the plan view, the outside air introduction portion 4 is provided in a hood shape from the untreated outside air opening 35 provided on the side wall on the downstream side of the rotating shaft 53, and is provided on the lower surface of the outside air introduction portion 4. An outside air opening 42 is provided. Further, an excess air exhaust port 37 is provided on the lower surface or the side surface of the supply air passage 36, and the excess air volume required by the intake port 110 is exhausted from the excess air exhaust port 37. The excess air exhaust port 37 is provided with a backflow prevention mechanism such as being urged in the closing direction, and outside air does not enter from this portion. Therefore, even when the fluctuating outside air is introduced temporarily or excessively for a certain period of time, the backflow load on the blower adjusting damper 5 can be reduced.
A small opening 52 is provided on the lower side of the air volume control plate 51. The position where the small opening 52 is provided is preferably a position where the influence of the outside air introduced from the outside air introduction unit 4 on the air volume control plate 51 is small. That is, when the outside air is introduced from the lower surface as shown in FIG. 2B, the influence of the outside air greatly acts on the upper part of the air volume control plate 51, so that the small opening 52 is provided on the lower side. The small opening 52 is an opening portion through which clean air passes when the air volume is low, and it is preferable to provide a small opening opening / closing lid 52a which is a backflow prevention plate. The small opening opening / closing lid 52a may simply be a plate-shaped lid having a rotating hinge at the upper part on the downstream side of the opening. The plate-shaped lid can prevent backflow by giving a weak urgency or preventing it from opening more than 90 °.
Further, when a weak urge is applied to the air volume control plate 51 in the direction of closing the clean air side opening 34, a strong wind blows from the gap between the air volume control plate 51 and the duct, which improves the prevention of backflow. However, when there is a small opening 52, the air volume control plate 51 comes into close contact with the clean air side opening 34, and the low air volume is blown out from the small opening.

The outside air supply device shown in FIGS. 1 and 2 can supply a sufficient amount of clean air to the intake port of the building by operating the blower with a large air volume during construction. By operating the blower at a low air volume during construction suspension such as at night, the influence of noise caused by the blower is reduced, and it is possible to maintain quietness for inpatients and the like. The shortage of low air volume from the blower is taken in from the untreated outside air opening 35. When the air volume control plate 51 receives the blowing pressure and balances, the rotation stops. Since the clean air supplied from the blower side is constantly flowing, it is possible to prevent the fungus from flowing back and adhering to the outlet or the outlet side of the filter and multiplying. Further, by urging the air volume control plate 51 toward closing the clean air air passage 33, the air flow of the clean air is strengthened, the backflow prevention function is strengthened, and the air volume control plate 51 is used for passing a low air volume. By providing the small opening 52, the air volume control plate 51 comes into close contact with the opening 34 on the clean air side, and it is possible to prevent the fungus from flowing back and being contaminated.

(Embodiment 2)
Example 2 of the outside air supply device is shown in FIG.
FIG. 3 shows a schematic configuration diagram of Example 2 of the outside air supply device. The outside air supply device includes a blower 1 composed of a fan and a filter, an outside air intake mechanism 2 provided with means for blowing clean air from the blower and preventing contamination of the downstream surface of the filter due to backflow, and an outside air introduction unit 4. The purification target of the blower 1 includes not only dust and mold, but also fungi, fungi, pollen and allergens. There is an untreated outside air opening 35 between the outside air intake mechanism 2 and the outside air introduction unit 4, and an air volume control plate 51 capable of rotating with the end of the untreated outside air opening 35 on the blower 1 side as a rotation shaft 53 is attached. .. The air volume control plate 51 has a shape in which two plates 51a (“clean air control plate” but omitted) and 51b (“outside air control plate” but omitted) are arranged at right angles. The plate 51a has the same shape as the air passage cross section of the duct 3 and is provided with a small opening 52, and the plate 51b has the same shape as the air passage cross section of the outside air introduction portion 4 and is the size that can be moved. The plates 51a and 51b are fixed at 90 degrees and the angles do not change. The small opening 52 includes a small opening and a small opening opening / closing lid 52a, and the small opening opening / closing lid 52a is sized to cover the small opening 52 and opens only in the same direction as the air blown from the blower 1. Also, it is designed not to open more than 90 degrees (closed when there is no wind). Control plate stoppers 34a and 43 are provided on the inner walls of the outside air intake mechanism 2 and the outside air introduction unit 4 so that the plates 51a and 51b do not rotate by 90 degrees or more, respectively. Further, the control plate stoppers 34a and 43 prevent a gap between the plates 51a and 51b and the cross section of the air passage.
An excess air exhaust port 37 may be provided on the downstream side of the outside air intake mechanism 2. The excess air exhaust port 37 has a structure similar to that of the small opening 52, and is designed to open only from the inside to the outside of the duct 3. It is desirable that the opening area of the excess air exhaust port 37 is larger than that of the small opening 52.

<Operation of outside air supply device example 2>
The operation of the outside air supply device will be described. For example, if two buildings are adjacent to each other, one is an operating hospital, and the other is a hospital scheduled to be dismantled, an outside air supply device is installed at the intake port 110 of the operating hospital before the dismantling of the hospital. Install as shown in FIG. The large air supply amount CA from the blower 1 is set based on the intake amount DA of the operating hospital, and the operation is started.
When the demolition work is started, the large air volume is set to normal operation during the construction time (Fig. 3 (a)), and the purified clean air supplied from the outside air supply device passes through the outside air intake mechanism 2 to the intake port 110. Be supplied. At that time, the air volume control plate 51 is at the position shown in FIG. 3A, and the plate 51a is parallel to the air flow path of the adjustment damper 5 and does not act in a direction that blocks the air flow path (pressure loss). Does not rise). Further, the plate 51b is a position that blocks the air flow path of the outside air introduction portion 4, but the outside air opening 42 is in a closed state and no force is acting from the outside air introduction portion 4 side.
On the other hand, during construction suspension such as at night, the outside air opening 42 is opened at the same time as switching to low air volume operation (FIG. 3 (b)), and the amount of outside air is reduced by the amount of low air supply CAmin supplied from the blower 1. Supplement with NA. The outside air NA is introduced, and as the amount of outside air increases, the air volume control plate 51 stops at the position of the control plate stopper 34a provided on the adjustment damper 5 as shown in FIG. 3 (b). Since the supply air amount CAmin is significantly lower than the intake amount CA, the outside air amount increases until the supply air amount CAmin + outside air amount NA = intake amount DA even after the state shown in FIG. 3B is reached. This will result in a low air volume operation state.

Even if excessive outside air NA is introduced during low air volume operation and the air volume control plate 51 is overloaded ([outside air NA volume-hospital intake volume DA]> [blower air supply volume CAmin]), the control plate stopper 34a Since it does not rotate any more, the possibility of excess outside air NA flowing back is limited to the small opening 52.
When the small opening 52 is [blower air supply amount CAmin]> [outside air amount NA-hospital intake amount DA], the small opening opening / closing lid 52a opens and the air supply passes through, and [outside air amount NA-hospital intake amount DA]. In the case of DA]> [Amount of air supplied from the feeder CAmin], the small opening opening / closing lid 52a closes quickly, so that the backflow of the outside air NA does not occur or only slightly invades through the small opening 52.
Even if the outside air NA penetrates very slightly, it does not reach the downstream of the filter because there is air from the blower 1. Further, since the air volume control plate 51 operates (reverse rotation) from the position of the control plate stopper 34a in the case of [air supply amount CAmin from the blower]> [outside air amount NA-hospital intake amount DA], the outside air No backflow of NA occurs.
To further reliably suppress the backflow of the outside air NA, an excess air exhaust port 37 is provided. As a result, when a backflow occurs, the excess inflowing outside air is first exhausted to the outside from the excess air exhaust port 37, so that the backflow can be further prevented.
Before the start of construction, the blower was switched to normal operation and at the same time the outside air introduction lid 44 was closed, the air volume control plate 51 returned to the position shown in FIG. 3 (a), and the plate 51b stopped at the position of the stopper 43 of the outside air introduction unit 4. To do. When the blower 1 is operated with a large air volume, the plate 51a is opened, the plate 51b comes into contact with the stopper 43 and is closed, so that the intrusion of outside air is stopped, and then the outside air introduction lid 44 is closed. Is also good.
By simply operating the air volume of the blower and the outside air introduction unit 4 in this way, it is possible to switch between normal operation and low air volume operation, and to prevent contamination of the downstream surface of the filter due to backflow of outside air NA during low air volume operation.

<How to install the outside air supply device>
The outside air supply device shown in FIGS. 1 to 3 has been mainly described as a stationary type on the ground, but depending on the position of the intake port of the building, the installation position of the blower may be changed to the rooftop, the middle floor, or a high temporary stand as necessary. There is a need. The shape of the outside air supply mechanism is appropriately redesigned accordingly. As shown in FIG. 9, an example in which the outside air intake mechanism 2 is directly attached to the blower 1 and connected to the intake port 110 via a connection duct, or when the position of the intake port is on the outer wall of the lower floor or in the machine room on the roof. Etc. are applicable. On the other hand, if the position of the intake port is on a higher floor and the blower 1 cannot be installed on the roof, the blower 1 will be installed on the ground, but if the outside air intake mechanism 2 is also installed on the ground, it will be connected to the intake port. The distance is too long. In such a case, as shown in FIGS. 9C and 9D, the outside air intake mechanism 2 is installed near the intake port and is connected to the blower 1 on the ground by a connecting duct. In addition, it is also possible to install a temporary stand. It is set appropriately according to the position of the air intake of the building and the surrounding environment.

<Details and applications of outside air supply device>
(Air volume control board)
The air volume control plate 51 can rotate around the rotation shaft 53, and can close the air flow path of the outside air introduction unit 4 without interfering with the air blown from the blower 1 in normal operation, and the outside air introduction unit in low air volume operation. It is a structure that can prevent the backflow of outside air by closing the air passage of clean air without obstructing the air flow path of No. 4.
For example, FIG. 4 shows various aspects. FIG. 4A is an example (two-blade right-angled type) in which the blower control plate 51 is composed of plates 51a and 51b arranged at right angles. An example of this is disclosed in FIG. A clean air air passage and an outside air introduction part air passage are provided side by side in the adjustment damper 5, and the air blow control plate having the plates 51a and 51b arranged at right angles rotates 90 degrees to make one air passage. It is a structure that opens and closes the other air passage.
FIG. 4B has a shape in which a plate 51a wider than the cross section of the clean air air passage 33 and a plate 51b wider than the cross section of the air passage of the outside air introduction portion 4 are fixed at an angle of less than 90 degrees. This is an example of the air volume control plate 51 (two-blade acute angle type). The fact that this cross section is wide means that the height in the rotation direction is almost the same as the height of the air passage so that the rotation can be shared, and the length direction is longer than the air passage.
FIG. 4C is an example (one-blade right-angled type) in which the air volume control plate 51 is configured by one plate on the rotating shaft 53. In this example, the closed portion of the clean air air passage 33 and the closed portion of the outside air introduction portion 4 are arranged at 180 degrees. An example of arranging at 90 degrees is as shown in FIG. The duct shape of the rotating portion will be designed accordingly.
FIG. 4D shows a configuration in which both air passages shown in FIG. 4B are opened and closed controlled by an air volume control plate 51 composed of one sheet.

The material of the air volume control plate 51 is arbitrary, but it is preferably made of a lightweight resin in order to speed up the operation (rotation) timing and the time required for the operation (to prevent backflow). Further, it is preferable to apply antibacterial and antifungal treatment. If it is made of metal, there is a concern that metal corrosion may occur due to the passage of outside air and that metal noise may occur, so countermeasures are required. If it is made of metal, it should be made of a material that does not easily corrode, and a cushioning material should be provided to prevent metal noise.
In order to soften the noise and impact when the air volume control plate 51 and the control plate stoppers 34a and 43 come into contact with each other, it is desirable to provide a packing material at the contact portion or the stopper of the air volume control plate 51 with the stopper. If possible, this cushioning material is also preferably antibacterial and antifungal.
An example is shown in which the air volume control plate 51 operates (rotates) horizontally, but since the influence of its own weight can be reduced if it is a lightweight material such as resin, it is also possible to use a method that operates (rotates) in the vertical direction. is there. In this case, the outside air introduction portion 4 is arranged above or below the duct 3.

(Outside air introduction part)
The outside air introduction portion 4 is formed in a tubular shape between the untreated outside air opening 35 provided in the duct 3 and the outside air opening 42 at the tip portion. It is provided with a stopper 43 that prevents the air volume adjusting plate 51 from hitting, an outside air introduction lid 44 that serves as a lid for the outside air opening 42, and the like. The shape in front of the untreated outside air opening 35 provided in the duct 3 is arbitrary, but the R shape is desirable in order to suppress the pressure loss. As shown in FIG. 4, the untreated outside air opening 35 is provided with an opening wider than the air volume control plate 51 so that the outside air NA can be supplied during low air volume operation in the case of a two-blade right-angled type or a two-wing acute-angled type. In the case of a one-blade right-angled type or a one-blade acute-angled type, the opening may be wider than that of the air volume control plate 51, or the size may be just barely large.
The place where the air volume adjusting plate 51 rotates in the part connected to the untreated outside air opening 35 has a square cross section so that the air volume adjusting plate can pass or close, and the other part has an arbitrary duct shape such as a round duct. Can be done.
The outside air opening 42 is provided on the bottom surface in order to avoid the influence of rainfall, or if it is provided on the side surface, a weather cover is installed. Further, it is desirable to attach a bird net to the outside air opening 42.

In the example in which the outside air opening 42 is provided on the bottom surface, as shown in FIG. 5, the outside air introduction lid 44 can be divided into one or a plurality of pieces. As each opening / closing means, means for rotating one side as a rotation axis, sliding means, and the like can be adopted. Further, the outside air introduction portion 4 may be arranged at an angle such as a right angle with respect to the duct 3. Various examples are shown in FIG.
5 (a) shows an example in which the lid rotates outward to open, FIG. 5 (b) shows an example in which the lid rotates inward to open, and FIGS. 5 (c) and 5 (d) show the lid slides in parallel. 5 (e) is an example of opening by rotating 90 degrees inside the 1/4 cylinder, and FIG. 5 (f) is an example of opening by sliding sideways. FIG. 5 (g) is an example in which the tip shape of the outside air introduction portion 4 is R-shaped. In this example, it is suitable for installation in a place that is not easily affected by the air volume of the outside air. The lid can adopt the structure shown in FIGS. 5 (a) to 5 (f).
FIG. 5 (h) shows an example in which a lid divided into a plurality of plates is rotated to open the lid, and FIGS. 5 (i) and 5 (j) show an example in which the outside air introduction portion 4 is arranged at an angle with respect to the duct 3. As shown in FIGS. 5 (a) to 5 (h), various methods can be adopted for the structure of the lid and the shape of the outside air introduction portion 4 to be R-shaped.

The opening area of the outside air opening 42 is preferably an area capable of supplying all the intake air amount DA. When adjusting the opening and closing of the outside air opening 42 during low air volume operation, a wind speed sensor can be installed in front of the intake port 110 and CVA control can be performed based on the information. Further, it can be opened manually and controlled by the air volume control plate 51. In this case, the external opening 42 opening method is preferably a method as shown in FIGS. 5 (c), (d), (f), and (h) in which the inflow direction of the outside air and the air flow direction in the outside air introduction portion 4 do not match. This is to alleviate the degree of excessive outside air introduction when a strong wind blows for a long time while the open state is maintained.
When the outside air introduction lid 44 of the air volume control plate 51 and the outside air opening 42 is made of a light material such as resin, the clean air air volume CAmin is insufficient with respect to the intake air volume DA when operating at a low air volume, and the pressure in front of the intake port 110 is negative. As a result, the outside air introduction lid 44 naturally opens and the outside air NA flows in, and is controlled by the air volume control plate 51 to compensate for the insufficient air volume.
Various examples have been introduced in which the duct 3 and the outside air introduction unit 4 are arranged in parallel, but both can be arranged at an angle such as a right angle. Further, as long as the air volume control plate 51 does not rotate toward the outside air introduction path 4, the installation shape of the outside air introduction path 4 can be arbitrarily designed according to the local situation.

(Embodiment 3)
FIG. 6 shows an example in which the air volume control plate has a double structure. FIG. 6A shows the state of the air volume control plate when the blower is operated with a large air volume, and FIG. 6B shows the state of the air volume control plate when the blower is operated with a low air volume.
This device is an example in which the air volume control plate 51 is doubled in order to more reliably prevent the backflow of outside air during low air volume operation. The configuration is such that a two-blade right-angled air volume control plate in which the air volume control plates 51a and 51b are arranged at right angles and an upstream air volume control plate 51c having a small opening on the upstream side of the duct 3 are provided. The upper and lower ends of the air volume control plate 51c on the upstream side and the upper and lower ends of the air volume control plate 51b are connected by a linear pulling member 56. A relay hole 57 is provided in the side wall portion of the duct 3 near the control plate stopper 34b of the air volume control plate 51c on the upstream side, and is passed through the linear pulling member 56. With this configuration, the air volume control plates 51a and 51b arranged at right angles and the air volume control plate 51c open and close in conjunction with each other. The small openings are provided in the air volume control plates 51a and 51c, and are not provided in the air flow control plates 51b.

FIG. 6A shows a normal operation performed during construction or the like, and since a large air volume flows through the duct 3, the air volume control plate 51c on the upstream side receives a large wind pressure and rotates around the rotation shaft 53b to blow air. Since the linear pulling member 56 pulls the air volume control plate 51b in the closing direction and the air volume control plate 51a is exposed to a large air volume, the outside air introduction path 4 is further urged in the direction in which the path opens. It will be blocked by 51b.
FIG. 6B shows a low air volume operation performed at night or the like, in which untreated outside air flows into the duct 3 side from the untreated outside air opening 35 more than the air volume supplied from the blower. As a result, the air volume control plates 51a and 51c move in the closing direction. In this case, even if the outside air slightly flows backward at the timing of closing the air volume control plate 51a on the duct 3 side, it is blocked by the air volume control plate 51c on the upstream side. The low air volume supplied from the blower side can be ventilated through a small opening.
FIG. 6C shows the movement of the three air volume control plates due to the change in air volume from the blower. "Normal large air volume (CA) operation-> low air volume (CAmin) operation switching such as at night-> low air volume (CAmin) operation such as nighttime-> normal operation switching such as at the start of construction" is shown. “CA” indicates a large amount of air supplied from the blower 1, “CAmin” indicates a low amount of air supplied from the blower 1, and “NA” indicates the amount of outside air sucked. When switching from normal operation (CA) → low air volume operation (CAmini) → normal operation (CA), the air volume control plates 51a, 51b, 51c and the linear tension member 56 operate, and during normal operation, from the blower. The air volume control plates 51a and 51c serve as a double barrier in the duct 3 during low air volume operation without interfering with the air supply. At this time, since the plates 51a and 51c are provided with small openings, air supply can pass through.

FIG. 7 shows a structure of a double air volume control plate different from the configuration shown in FIG. FIG. 7A shows an example of a two-blade acute-angled air volume control plate, and FIG. 7B shows an example of a one-blade right-angled type.
In FIG. 7A, the length of the air volume control plate 51c on the upstream side is longer than the width of the duct 3, and when rotated by the rotating shaft 53b, it comes into contact with the side wall on the opposite side of the duct 3, and the amount of rotation is increased. It will be less than 90 °. Further, on the downstream side, an air volume control plate 51b having a length longer than the width of the outside air introduction portion 4 and an air volume control plate 51a having a length longer than the width of the duct 3 are attached to the rotating shaft 53a. The amount of rotation of the air volume control plates 51a and 51b is also less than 90 °. The tip of the air volume control plate 51c and the tip of the air volume control plate 51b are connected by a linear tension member 56, and rotate in conjunction with each other.
In FIG. 7B, the duct 3 and the outside air introduction portion 4 are arranged at right angles. The untreated outside air opening 35 provided on the side wall of the duct 3 is smaller than the cross section of the duct 3. An upstream air volume control plate 51c is arranged on the rotating shaft 53b, and a downstream air volume control plate 51d is arranged on the rotating shaft 53. The air volume control plate 51d is large enough to block both the duct 3 and the untreated outside air opening 35. The tip of the air volume control plate 51c on the upstream side and the air volume control plate 51d on the downstream side are connected by a linear tension member 56. In the two air volume control plates 51c and 51d, the air volume control plate 51c opens in the large air volume operation state of the blower, and in conjunction with this, the air volume control plate 51d closes the untreated outside air opening 35. In the low air volume operating state of the blower, the air volume control plate 51d is rotated by the suction on the building side to open the untreated outside air opening 35, and the untreated outside air is introduced into the duct. Accordingly, the air volume control plates 51c and 51d rotate in the direction of blocking the duct 3. The air volume control plates 51c and 51d are provided with small openings through which clean air with a low air volume passes.

(Embodiment 4)
FIG. 8 shows an example of an outside air supply device in which a duct 3 and an outside air introduction portion 4 are arranged in series as an outside air intake mechanism 2 and a connection end to an intake port 110 on the building side is provided in the middle.
A linear tension member 56 provided with an air volume control plate 51a having a small opening on the blower side of the duct 3 and an air volume control plate 51e on the outside air introduction portion 4 side, and attached to the upper and lower ends of the air volume control plates 51a and 51e on the opening and closing side. Are attached and connected to each other through hooking members 57a and 57b for relay guidance.
During normal operation with a large air volume, as shown in FIG. 8A, the air blown from the blower 1 is supplied to the intake port 110 of the building. During low air volume operation, as shown in FIG. 8B, at the same time as the outside air introduction lid 44 opens, the air volume control plate 51e opens and the air volume control plate 51a closes, and outside air is introduced into the intake port 110. It is supplied and backflow is suppressed. When the air volume control plate 51 and the outside air introduction lid 44 are made of a light material such as resin, when the outside air introduction lid 44 is opened and closed on the upper side, the outside air introduction lid 44 is pulled up by the intake air of the intake port 110 during low air volume operation. It opens naturally and the outside air flows in.

(Embodiment 5)
FIG. 9 shows various installation examples of the outside air supply device. Since hospitals in building buildings also have air intakes at high places, it is necessary to supply outside air corresponding to those air intakes. For example, a form in which a connection duct is extended from a blower arranged on the ground or a form in which the connection duct is arranged on the roof is required. There is also a form in which a connection duct is branched from one blower and connected to a plurality of supply ports.
As shown in FIG. 9A, when the intake port 110 is located in the lower part of the outer wall, the blower 1, the duct 3 and the outside air introduction part 4 are connected and installed on the ground, and the air intake port 110 is connected to the intake port 110. Connect with a connection duct. On the other hand, when the intake port 110 is located in a high-rise portion of the outer wall, as shown in FIG. 9B, the blower 1, the duct 3 and the outside air introduction portion 4 are connected and installed on the roof, and the intake port 110 is connected to the intake port 110. A connecting duct is used to connect the two, or as shown in FIG. 9C, a duct 3 and an outside air introduction unit 4 are installed in the immediate vicinity of the intake port 110, and a connecting duct is used to connect the air to the blower 1 installed on the ground. Connecting. As shown in FIG. 9D, the duct 3 and the outside air introduction unit 4 may be installed in the immediate vicinity of the intake port 110 separately, and may be connected to the blower 1 installed on the ground by a connecting duct. Further, in FIGS. 9 (c) and 9 (d), the blower 1 may be installed on the roof.

According to the present invention, air can be supplied to the outside air intake port during intake air from which dust, fungi (mold), etc. have been largely removed in normal operation, and outside air is introduced during low air volume operation to compensate for the insufficient air volume. Even if the amount of fluctuating outside air introduced is temporary or excessive for a certain period of time, it is possible to prevent contamination of the downstream surface of the filter due to backflow, so the amount of intake air is secured even when normal operation and low air volume operation are repeated. However, it is an air purification system that can supply air with significantly removed dust and mold during normal operation.
In addition, since it is a simple mechanism, it can be realized at low cost, and since it can be carried out without using electricity other than a fan, it is not easily affected by rainfall and temperature.

At the construction site to which the present invention is applied, it is necessary to deal with the following situations, and the present invention is suitable for these demands.
For temporary support only during the dismantling work period, a dust / mold removing means equipped with a filter and a fan is installed on the outdoor side of the outside air intake, and connected with a duct etc. to clean air (air with significantly removed dust / mold). Can be considered as a method of supplying the outside air to the outside air intake.
Since the dust / mold removing means is equipped with a fan, direct noise / vibration from the main body and indirect noise / vibration through the duct are generated during operation. Since hospitals are intended for patients who have to stay at rest for a long time, they need to be more careful about noise and vibration than general buildings, and when noise and vibration interfere with medical procedures such as examinations and medical examinations. There is. Under these circumstances, it is necessary to take measures only during the demolition work period when a lot of dust and mold are scattered. Since the measures are taken only during the dismantling work time, it is permissible to introduce outside air during the construction suspension, which is less likely to scatter dust and mold. However, if the air volume adjustment damper is throttled for low air volume operation, the problems of noise and vibration cannot be solved. Therefore, the noise of the motor and fan is suppressed by suppressing the power of the fan.
When the fan is stopped, mold spores that have invaded through the opening of the opening / closing mechanism provided to secure the amount of air supplied to the hospital will be seen on the downstream surface of the blower filter (what is the filter surface that removes dust and mold during normal operation? It adheres to the opposite surface) and may grow on the filter surface, especially under high humidity conditions such as rainy weather. If normal operation is performed in this state, mold-containing air will be supplied from the contaminated filter, so it is necessary to avoid stopping the fan (because it is used outdoors, turn the fan on and off, such as in winter). There is also concern that switching will increase the risk of condensation).
When the fan is operated with a low air volume, if the amount of outside air introduced temporarily or for a certain period of time becomes excessive at the opening of the opening / closing mechanism, the backflow of the introduced outside air occurs, which causes the downstream surface of the filter of the dust / mold removal unit. The risk of contamination remains. In the present invention, measures against mold and microbial contamination are taken, such as providing a small opening with a backflow prevention mechanism in the air volume control plate that blocks the air passage, and providing multiple air volume control plates. With these measures, when the dust / mold removing means is operated normally during the construction period and the low air volume is operated during the construction suspension, the amount of outside air introduced is temporarily or temporarily while compensating for the insufficient air volume by introducing fluctuating outside air. We have realized a device that prevents contamination of the downstream surface of the filter due to backflow even if it is excessive for a certain period of time.

1 Blower 11 Filter 12 Base 13 Motor 14 Fan 15 Anti-vibration member 2 Outside air intake mechanism 3 Duct 31 One end 32 One end 33 Clean air air passage 34 Clean air side opening
34a Control plate stopper 35 Untreated outside air opening 36 Supply air passage 37 Excess air exhaust port 4 Outside air introduction part 42 Outside air opening 43 Control plate stopper 44 Outside air introduction lid 5 Blower adjustment damper 51 Air volume control plate 51a Clean air control plate 51b Outside air control Plate 52 Small opening 52b Backflow prevention opening / closing plate 53 Rotating shaft 56 Linear pulling member 57 Relay hole

110 air intake

Claims (5)

It is an outside air supply device equipped with a blower equipped with a filter facing the outside air and an outside air intake mechanism.
The outside air intake mechanism is equipped with an outside air introduction part for introducing untreated outside air and a blower adjustment damper provided between the ducts.
One end of the duct of the outside air intake mechanism is connected to the blower side, and the other end is connected to the intake port side of the building.
The blower adjustment damper adjusts the opening degree of the clean air blower path and the outside air introduction section where the air that has passed through the filter from the blower flows, and is a rotatable air volume control that opens and closes the clean air blower path and the outside air introduction section. An outside air supply device having a plate, wherein the air volume control plate is rotated by wind pressure. Outside air supply apparatus according to claim 1, characterized in that the temporary device used during the construction of the adjacent building buildings having an inlet. The air volume control plate includes a clean air control plate that opens and closes the clean air air passage and an outside air control plate that opens and closes the outside air introduction section.
The outside air supply device according to claim 1 or 2 , wherein the clean air control plate includes a small opening with a backflow prevention opening / closing plate. The outside air supply device according to any one of claims 1 to 3 , wherein the blower includes a base having an anti-vibration stand, a fan drive motor, a fan, and a filter. The outside air supply device according to any one of claims 1 to 4 performs a large air volume operation exceeding the intake air amount of the building during the construction of the adjacent building, and performs a low air volume operation during the construction suspension of the adjacent building. A method of supplying outside air to a building, which is characterized in that purified air is supplied to the intake port of the building inside, and the driving sound of an outside air supply device entering from the intake port of the building is reduced during construction suspension.

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