JP7521156B2 - Clean outside air supply device - Google Patents

Description

It relates to air conditioning technology, specifically the technology to purify the air taken in from outdoors during construction.

Construction work such as demolition of a building may take place next to a building that is currently in use. Although the construction area is fenced off to prevent dust from scattering and measures to prevent noise are taken, some dust still scatters.
In particular, preventing fungal infections such as Aspergillus is a major issue during demolition and renovation work on hospitals. Spores of fungi such as Aspergillus pose a major risk. It is known that immunocompromised patients are prone to developing invasive pulmonary aspergillosis when they inhale Aspergillus spores that are dispersed in large quantities during construction, and this disease has a high mortality rate.
During demolition work, measures to prevent dust are taken such as sprinkling water and installing dustproof sheets, but some of the large amount of dust generated will spread, and air containing higher concentrations of dust than the general air may be drawn in through the outside air intakes of nearby hospitals, putting a strain on the hospital's filters.
Each room in a hospital is classified according to cleanliness level depending on whether it is an operating room, ICU, or general hospital room, and it is required to maintain an air cleanliness level appropriate for that purpose. The Hospital Equipment Design Guidelines (Non-Patent Document 1) created by the Japan Medical Welfare Equipment Association is widely used. In the guidelines, each room is classified according to cleanliness level, and ventilation conditions such as minimum air volume guidelines (outdoor air volume and indoor circulating air volume), indoor pressure (positive or negative pressure), and efficiency of the final air supply filter are given. Therefore, air intakes for air conditioning may be installed in the building according to the class.
The hospital's air conditioning system must maintain the air quality required for health, safety, and comfort. The amount of outside air and the amount of indoor circulating air required to meet the air quality requirements in each room must be specified and maintained.

Because air conditioning is so meticulously managed in operating hospitals, it is difficult for operating hospitals to take measures against dust and mold caused by demolition work, due to various constraints. For example, the work must be carried out in operating hospitals (each building including examination and hospital wards), the installation of filters and other means of removing dust and mold increases pressure loss and the need to increase the capacity of existing fans, measures to prevent noise and vibration, and removal after demolition work all have a significant impact not only on facility management but also on medical activities and patients. Therefore, measures against dust and mold caused by demolition work that do not place a burden on the hospital are needed.

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

The objective is to adjust the air supply so that outside air containing dust, fungi, etc., caused by demolition work on hospitals, etc., does not affect the intake air of adjacent buildings, such as hospitals, that are in operation.

The present inventors have proposed, in Japanese Patent Application No. 2019-3471, an outside air supply device that adjusts filtered clean air and untreated air and supplies the adjusted air to an operating hospital, etc. In the present invention, an outside air supply device with improved adjustment capability for clean air and untreated air is proposed.
1. An outside air supply device having a blower with a filter and an outside air intake mechanism,
The outside air intake mechanism is an outside air supply device characterized by having a clean air blowing duct through which air that has passed through a filter from a blower flows, an outside air inlet, and an air blowing adjustment mechanism that adjusts the opening degree of the clean air blowing duct and the outside air inlet.
2. The outside air supply device according to 1., characterized in that the air flow adjustment mechanism is provided with a rotatable air flow control plate that opens and closes the clean air blowing duct and the outside air inlet, and is provided with an air flow control plate that is common to both the clean air blowing duct and the outside air inlet, or with separate air flow control plates that open and close each of them.
3. The airflow adjustment mechanism has a rotatable airflow control plate that opens and closes the clean air blowing duct and the outside air introduction part, and an air pressure transmission mechanism;
3. The outside air supply device according to 1 or 2, wherein the wind pressure transmission mechanism includes a wind pressure control plate that controls (amplifies) the wind pressure on the clean air blowing passage side received by the air volume control plate.
4. The outside air supply device according to 3., wherein the air pressure control plate is connected to the blower side of the air volume control plate via a connecting member that can adjust the attitude of the air pressure control plate.
5. The outside air supply device according to any one of 1. to 4., characterized in that the building having the air intake is a hospital, and the device is a temporary device used during construction of an adjacent building.
6. A method for supplying outside air to a building, characterized in that the outside air supply device described in any one of 1. to 5. operates at a high air volume exceeding the intake volume of the building during construction, and operates at a low air volume during suspension of construction.

1. The outside air supply device of the present invention allows operating buildings such as hospitals to take in outside air containing dust, fungi, etc., caused by demolition work on hospitals, etc., without affecting the intake of air by adjacent buildings such as hospitals that are in operation. The outside air supplied is clean air that has passed through a filter during construction, and is a mixture of clean air and untreated air during construction stoppages such as at night when dust, etc., is not generated, so that outside air containing dust, fungi, etc., caused by construction is not taken into the building.
The opening adjustment mechanism adjusts the amount of mixed air supplied by the air supplied through the filter on the blower side and the amount of outside air supplied from the outside air inlet. In other words, if the amount of air supplied from the blower is insufficient for the amount of intake air required by the building when the blower is operating at a low air volume or is stopped, the outside air inlet is opened to introduce untreated outside air to make up for the shortage, and during normal operation of the blower, the clean air blowing duct is opened and the outside air inlet is closed to supply clean air to the building side such as a hospital.
The outside air intake mechanism that is attached to the air intake of a building can take the form of a duct type, a chamber type, or a chamber type with a built-in duct.
2. The air volume control plate rotates according to the pressure of the air being blown, and is a mechanism for adjusting the opening of the air passage, so no motor or other power source is required. The air pressure transmission mechanism is a mechanism that supplements the air pressure on the blower side that the air volume control plate receives. For example, as the opening angle of the air volume control plate increases, the air pressure it receives decreases. However, by installing an air pressure control plate that receives air on the windward side on the air volume control plate, the air pressure can be supplemented to open the air volume control plate and the opposite outside air inlet side can be closed, improving the opening and closing adjustment of the clean air supply passage and the untreated outside air supply passage. In other words, when the supply of clean air from the blower is sufficient, it is possible to prevent the intrusion of untreated outside air.
In other words, by providing an air pressure control plate that transmits the wind pressure of the clean air to the air volume control plate, it is possible to minimize the mixing of untreated air into the clean air supplied during construction. The air pressure control plate efficiently transmits the supply wind pressure of the clean air to the air volume control plate during normal operation, blocking the outside air intake section and suppressing the mixing of untreated outside air.
In addition, by operating the blower at a low air volume during the suspension of construction, untreated outside air does not flow back to the blower side, and the wind pressure received by the wind pressure transmission mechanism and the air volume control plate is small, so that the amount of intake air required by the building can be supplied from the opening on the outside air introduction side. As a result, even if the untreated outside air contains dust, fungi, etc., it does not contaminate the filter on the blowing side of the blower. And, by operating at a low air volume, it is possible to reduce the influence of the motor rotation sound and the wind noise caused by the blowing directly or through the intake port on the room inside the building. In particular, it is possible to maintain quietness at night, and provide an environment where nervous hospitalized patients can stay calm. Quietness is further improved by using a blower with soundproofing measures. For example, it is possible to suppress the increase in the number of times hospitalized patients get on and off the bed or go to the toilet due to the difficulty of falling asleep or the inability to get a good night's sleep, and the associated increase in the risk of falling. It is possible to prevent the increase in the burden on nurses due to these patient actions.
3. Furthermore, the attitude and position of the air pressure control plate can be adjusted using a connection member that allows for adjustment of the attitude, thereby adjusting the air pressure received by the air volume control plate. When observed cross-sectionally, the air flow flowing through the air duct is not uniform due to the influence of the curvature of the duct, etc., so the attitude and position of the air pressure control plate are adjusted according to the characteristics of the air flow associated with the structure of each outside air supply device. The area of the air pressure control plate can also be adjusted to adjust the air pressure.
4. The outside air supply device of the present invention operates at a high air volume that exceeds the intake volume of the building during construction (the high air volume is an amount that ensures that at least the static pressure at the connection with the intake port is positive, and the excess is exhausted from the excess air exhaust port) to supply clean air to the building intake port, and operates at a low air volume during construction suspension, preventing the filter side of the blower from being contaminated by outside air while reducing the driving noise and vibration of the outside air supply device entering from the building intake port. This prevents contamination of an operating hospital adjacent to the hospital under construction, and keeps the hospital quiet during construction suspension periods such as at night. During construction suspension, outside air similar to normal outside air is taken in, so the normal air conditioning equipment of the operating hospital can be used to adequately prevent external contamination.
5. Therefore, the present invention can reduce the noise caused by the supply of outside air, and prevent secondary contamination caused by air blowing because the blower (especially the downstream surface of the filter) is not contaminated by backflow. In particular, reconstruction and renovation work of hospitals, which require strict management, can be carried out safely.
In addition, this outside air supply device has a simple mechanism and can be realized at low cost. Since it does not require electricity other than for the fan, it is less susceptible to the effects of rain or temperature changes.

An example of the basic configuration (duct type) of an outside air supply device. (a) Overall schematic diagram. (b) Plan schematic diagram of an air volume adjustment duct. Basic configuration example of an outside air supply device using a chamber A diagram showing an example of an airflow adjustment mechanism applied to an adjustment duct. FIG. 1 shows an example of an airflow adjustment mechanism applied to an adjustment chamber. A diagram showing an example of adjusting the wind pressure transmission mechanism A diagram showing an example of adjusting the size of the wind pressure control plate FIG. 13 shows an example 1 of the operation of the airflow control plate (in the case of one plate-shaped body). FIG. 1 shows an example of operation of the airflow control plate 1 (an example of operation of the airflow control plate provided in the chamber). A diagram showing an example 2 of the operation of the airflow control plate (parallel airflow duct type adjustment duct) FIG. 3 shows an example 3 of the operation of the air volume control plate (an example of a double-type air volume control plate). FIG. 4 shows an example 4 of the operation of the air volume control plate (an example in which the air pressure control plate is also provided on the outside air intake side). 1A is a schematic diagram of the airflow adjustment mechanism applied to the conditioning chamber, in which (a) shows the state before the duct-type airflow passage is installed, and (b) shows the state after the installation (simulation of the airflow adjustment mechanism applied to the conditioning duct). 1A is a vertical cross-sectional view of the clean air blowing duct side, FIG. 1B is a vertical cross-sectional view of the outside air intake side, and FIG. 1C is a horizontal cross-sectional view showing an air blowing adjustment mechanism applied to an adjustment chamber. 1A and 1B are diagrams showing an airflow adjustment mechanism applied to an adjustment chamber in which a duct-type airflow duct is installed, in which (a) is a vertical cross-sectional view of the clean air airflow duct side, (b) is a vertical cross-sectional view of the outside air intake side, and (c) is a horizontal cross-sectional view. 1A and 1B are cross-sectional views showing the airflow around the airflow adjustment mechanism and an indicator of the opening degree of the airflow control plate, where FIG. 1A is before the installation of a duct-type airflow duct, and FIG. FIG. 13 is a schematic diagram showing an airflow adjustment mechanism in which two airflow control plates are connected at a position away from the rotation axis and applied to an adjustment chamber, in which (a) shows the state in which the airflow control plates close the opening for untreated outside air, and (b) shows the state in which the airflow control plates close the opening for clean air. FIG. 13 is a schematic diagram of an airflow adjustment mechanism in which two airflow control plates are connected at a position away from the rotation axis and offset vertically, the mechanism being applied to an adjustment chamber; (a) shows the state in which the airflow control plate closes the opening for untreated outside air, and (b) shows the state in which the airflow control plate closes the opening for clean air. FIG. 13 is a schematic diagram of an airflow adjustment mechanism in which two air volume control plates are connected to a position away from the rotation axis and an air pressure control plate is provided on the air volume control plate on the clean air side, the mechanism being applied to an adjustment chamber. (a) shows the state in which the air volume control plate closes the opening for untreated outside air, and (b) shows the state in which the air volume control plate closes the opening on the clean air side. FIG. 1 is a schematic diagram showing an example of a blower.

The present invention is an outside air supply device that prevents outside air containing dust, fungi, etc., caused by demolition work of a hospital or the like from affecting the intake air of an operating building such as a hospital. This device supplies clean air that has passed through a filter during construction, and can supply a mixture of clean air and untreated air to the operating building during construction stoppages such as at night when dust, etc., is not generated, so that outside air containing dust, fungi, etc., caused by construction is not taken into the building. Note that in this patent application, a hospital refers to a building unit including a hospital ward and a medical examination building.
The fresh air supply device of the present invention includes a blower equipped with a filter, and an fresh air intake mechanism that connects the blower to the air intake of a building. The fresh air intake mechanism includes a connection duct that connects to the blower, an fresh air intake section that introduces fresh air, an air volume adjustment mechanism, and a connection duct that connects to the air intake of the building as necessary. The air volume adjustment mechanism adjusts the opening of the clean air blowing duct and the fresh air intake section according to the amount of clean air and the amount of untreated fresh air supplied to the air intake of the building.
The air volume adjustment mechanism is composed of a pressure receiver (air volume control plate) such as a plate-like body that rotates when it receives air pressure from the blower, and an air pressure transmission mechanism that assists the air pressure that hits the pressure receiver, etc. The pressure receiver is, for example, a plate-like body that is freely rotatably attached to a rotating shaft, and the plate-like body is a mechanism that changes the rotation angle θ depending on the air pressure of the clean air and the air pressure of the untreated outside air.

The wind pressure transmission mechanism has a function of urging the plate-like body, etc. that rotates under the wind pressure of the blower, to rotate under the wind pressure when the wind speed in the air passage is generally slower near the side compared to the center, or when the wind receiving angle θ becomes small. Also, the wind pressure transmission mechanism has a function of supplementing the wind pressure according to the air blowing conditions, since the air flow flowing through the air passage may be slow at the periphery and fast on the curved outer surface side, or may be non-uniform, depending on the installation state of the outside air supply mechanism, etc.
For example, in the case of an outside air intake mechanism, the air flow passing through the connection part is often biased, and the wind speed distribution is often large. For example, since a blower is generally installed at a position lower than the air intake of a building, when it is connected with a duct, there is a bend in front of the air intake, and the wind speed distribution inside the duct becomes large (the wind speed outside the bend is faster than the inside). In addition, since the horizontal wind speed distribution inside the duct is slower near the side than the center, the air volume control plate installed on the side operates in the direction to block the opening for untreated outside air of the outside air intake part during normal operation, but the wind speed acting on the air volume control plate slows down as it approaches the opening for untreated outside air. Furthermore, if an outside air intake mechanism is installed after the bend in the duct, the vertical wind speed acting on the air volume control plate is not uniform and is concentrated at the top.
As such, the wind speed acting on the air volume control plate is not uniform across the entire plate, and the horizontal wind speed slows down the closer it is to the untreated outside air opening, so the air volume control plate alone may not be able to completely block the outside air intake section, and therefore the present invention provides a wind pressure transmission mechanism.
The housing of the airflow control mechanism can be a duct, a chamber, or a chamber with a built-in duct. When a chamber is used, it is connected to a clean air blowing path (duct) through which air that has passed through a filter from a blower flows, and when an outside air intake is provided on the chamber side, it becomes difficult to close the outside air intake with only the airflow control plate, so the role of the wind pressure transmission mechanism becomes more important. For example, when a chamber is provided that is directly connected to the air intake port of a building, the space expands when clean air enters the chamber, but the wind pressure from the opening on the outside air intake side may increase due to the influence of the air intake of the building, and it may be difficult to close the opening of the outside air intake with only the wind pressure hitting the airflow control plate. When it is difficult to directly connect a duct to the air intake port of a building, or when a duct is extended into the inside of the chamber to connect the chamber, the type of chamber with a built-in duct is used.

The amount of air drawn into a 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 blower is sufficient. In other words, the blower is maintained so that the static pressure at the connection with the intake port is positive by the air supplied. However, the blower generates motor noise and vibration noise, which may cause discomfort to the residents in the building at night. In particular, since hospitalized patients may not be able to stay still, it is desirable to operate the blower at a low air volume or stop it at night, and the amount of air required for the insufficient intake of the building needs to be supplemented with untreated outside air. When the operation of the blower is stopped, there is a risk that fungi contained in the outside air will adhere to the blower port or the blowing side of the filter, and if the attached fungi grow, restarting the blower will supply fungi to the building, which may be counterproductive. In particular, the risk of growth of attached fungi increases in high humidity environments such as the rainy season. Therefore, it is desirable to operate the blower at least at a low air volume to prevent contamination due to backflow even at night. The present invention has developed an air volume adjustment mechanism that uses untreated outside air to supplement the amount of air required for intake of the building, which is insufficient when operating at a low air volume. The present invention has also 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 underside of the filter.
Since mold and other fungi can enter through even the smallest gaps, we are proposing an adjustment mechanism that has improved prevention capabilities.
The present invention is an outside air supply device that does not adversely affect the intake air of buildings in operation, such as hospitals, located nearby during construction work. The present invention operates normally during construction to supply clean air, and when operating at low air volume during construction stoppages, it introduces outside air to make up for the lack of air volume, while preventing contamination of the downstream surface of the filter due to backflow of outside air, and can maintain the cleanliness of the filter.
The present invention is a device that is installed outdoors for temporary use during demolition work, removes dust and mold, and supplies air. It has a simple mechanism that keeps costs down and is less susceptible to breakdowns caused by rain or temperature changes.
Furthermore, during periods when construction is down, such as at night, no dust or other particles are generated, so even if untreated outside air is supplied, it can be treated by the normal air conditioning equipment installed in the building.

The blower is equipped with a fan driven by a motor and a filter as disclosed in the earlier application, Patent Application No. 2019-3471 (see Figure 19). The filter used is a fine HEPA filter that filters out fungi such as mold and bacteria, a high-performance filter, a bag filter, etc. In order to suppress vibration, it is preferable that the stand and housing are of a quiet type with an anti-vibration structure. By providing an anti-vibration structure, the vibration noise of the blower that enters the building can be reduced.

The outside air intake system includes an airflow adjustment mechanism that supplies clean air and untreated outside air to the building, and includes a connecting duct on the blower side and a connecting duct on the air intake side of the building. Note that if the airflow adjustment mechanism is directly connected to the supply port, the connecting duct is not required.
The housing of the airflow adjustment mechanism may take the form of a duct or a chamber.
The connection duct of the airflow adjustment mechanism can be made of a plate-like body or a flexible body. The adjustment duct constituting the airflow adjustment mechanism is suitably formed of a plate-like body. The connection mechanism between the adjustment duct or adjustment chamber constituting the airflow adjustment mechanism and the front and rear connection dampers can be made by well-known means such as screw fastening via a flange or rubber band, and it is preferable to make them tightly attached so that no gaps are formed using a packing or the like.

The outside air intake section is formed by providing an opening in the middle of the adjustment duct or adjustment chamber that forms the airflow adjustment mechanism. A duct for introducing outside air can also be connected to the opening. The opening should be provided on the side or bottom. An opening on the top should be avoided as it may allow rain to blow in or rainwater to get in.

The air volume adjustment mechanism is a mechanism that can adjust the opening and closing of the clean air blowing duct or the outside air introduction duct. The air volume adjustment mechanism is provided in the adjustment duct or the adjustment chamber.
The opening and closing means may be a means for rotating or sliding an air volume control plate, which is a plate-like body having a size large enough to close each of the ventilation passages.
The rotating means is, for example, composed of a rotating shaft and an air volume control plate, which is a plate-like body attached to the rotating shaft so that it can rotate freely. 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 it can close the clean air blowing duct and the outside air introduction duct. The height of the air volume control plate is basically the same length as the clean air blowing duct, and the width is the same as or slightly longer than the clean air blowing duct, so that it is large enough to completely block the blowing duct. This size has a similar relationship with the outside air introduction duct, and the outside air introduction duct is designed in a shape that allows the opening for introducing outside air to be completely blocked by the air volume control plate. The air volume control plate can be one or two plates attached to the rotating shaft. In the case of two plates, the plates are attached in a "V" shape around the rotating shaft. The angle between the two plates is within 90 degrees.
Also, the rotating means can open and close the air passage with a divided plate.
Furthermore, it is also possible to provide a rotating plate at the front and rear to open and close in an interlocking manner. The rotating mechanism such as the rotating shaft and the air volume control plate can also be provided separately via a connecting member.

A support structure can be provided at the location where the air flow control plate closes the air passage or the outside air intake passage to fit snugly so that no gaps are formed. This support structure also serves as a stopper for the air flow control plate.
The air volume control plate can also be provided with a small opening that allows a low volume of air to pass when the blower is at a low volume. If a backflow prevention structure is provided in the small opening, safety in preventing fungal intrusion is further improved. The backflow prevention structure can be realized simply by providing a lid-like opening and closing plate that is larger than the small opening on the downstream side of the opening and does not open more than 90 degrees.

The wind pressure transmission mechanism is a mechanism that assists the wind pressure when the rotation of the air volume control plate brings it closer to the side part where the wind speed is slower than the center part of the air passage, so that the wind speed is slower and the angle is smaller, and the wind pressure that rotates the air volume control plate is smaller. For example, the air pressure control plate is attached to the upwind side of the air volume control plate (usually the clean air passage side) with a connecting member.
The connecting members can be two or more. For example, depending on the size and shape of the wind pressure control plate, the wind pressure acting on the wind pressure control plate may be distributed, and it may be more stable to use two connecting members.
The wind pressure control plate is installed at an angle so that the wind speed hitting the air volume control plate is slow and the wind angle is small, so that the wind hitting the air pressure control plate is large. As described in paragraph (0010), since the airflow distribution in the air duct is not uniform, it is necessary to adjust the size and attitude of the wind pressure control plate according to the structure of the specific outside air intake mechanism.
The posture can be adjusted by adjusting the angle of the wind pressure control plate, adjusting the size of the wind pressure control plate, adjusting the expansion and contraction of the connecting member, adjusting the angle of the connecting member, adjusting the mounting position of the connecting member, etc. These means can also be combined.

(Embodiment 1)
An example of the basic configuration of an outside air supply device is shown in Fig. 1. Fig. 1(a) is a schematic diagram of the overall configuration, and Fig. 1(b) is a schematic plan view of an air volume adjustment mechanism equipped with a wind pressure transmission mechanism.
The outside air supply device includes a blower 1 and an outside air intake mechanism 2 that is attached to the blowing side of the blower 1 via a connecting duct 16 and is connected to an air intake port 110 on the building side via a connecting duct 17. The outside air intake mechanism 2 includes an adjustment duct 31 having a duct-like housing shape, one end of the adjustment duct 31 is attached to the blower 1 side via the connecting duct 16, an air supply adjustment mechanism 5 is located inside the adjustment duct 31, and the other end is connected directly or via the connecting duct 17 to the air intake port 110 through which a building such as a hospital takes in outside air.
In this example, the air flow adjustment mechanism 5 is provided inside the adjustment duct 31 .
The outside air intake mechanism 2 is cylindrical with a square or circular cross section, the air flow adjustment mechanism 5 is provided in an adjustment duct 31 made of a non-deformable plate-like body, and the other connection ducts 16, 17 may be flexible for easy adjustment. The air flow adjustment mechanism 5 is provided with an air volume control plate 51 and an outside air intake section 4 that communicates with an opening 35 for untreated outside air. The blower 1 is provided with a motor 13, a fan 14, and a filter 11 mounted on a base 12 as basic components, as shown in the schematic configuration in Figure 19. The motor 13 and the fan 14 are preferably attached via vibration-proof members 15.

The outside air intake mechanism 2 has a clean air blowing duct 33 upstream of the air blowing adjustment mechanism 5 in the middle, and a supply air duct 36 downstream of the air blowing adjustment mechanism 5. The clean air blowing duct 33 is an air blowing duct through which clean air that has passed through a filter is blown out, and the supply air duct 36 is an air blowing duct through which the clean air, untreated outside air, or a mixture of both passes and is supplied to the air intake 110 of the building.
In this embodiment, the airflow adjustment mechanism 5 includes an airflow control plate 51 rotatably mounted on a rotation shaft 53 provided along the side wall. An air pressure transmission mechanism 7 is provided on the clean air blowing duct 33 side of the airflow control plate 51.
The adjustment duct 31 has a clean air side opening 34 on the clean air blowing passage 33 side.
An untreated outside air opening 35 is provided on the side wall downstream of the rotating shaft 53, and is connected to the outside air inlet 4. An outside air opening 42 is provided at the tip of the outside air inlet 4. The outside air opening 42 is suitably a downward opening to prevent rain and dust from entering. 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 that allows it to close both openings.
The clean air side opening 34 may be left open or may be provided with a control plate stopper 34a as a receiving part. The control plate stopper 34a may be provided with a framed stopper with a packing, a slit material, a mesh material, or the like, to provide a rotation prevention function and a tight contact function. When a packing or the like is provided to provide a tight contact function, the function of preventing fungi from entering through gaps is improved. The untreated outside air opening 35 may also be provided with a rotation prevention function and a tight contact mechanism. The untreated outside air opening 35 may be exposed to the outside air as is, but in this example it is connected to the outside air through the outside air intake part 4.

Depending on the rotational position of the air volume control plate 51, air is supplied from the clean air side opening 34 and from the untreated outside air opening 35. During construction, the blower blows air at a high volume, exceeding the intake volume required by the building, and the air pressure of the clean air becomes high, so the air volume control plate 51 rotates in a direction that closes the untreated outside air opening 35. The wind pressure that the air volume control plate 51 receives decreases as it rotates toward the untreated outside air opening 35, making it difficult to completely close the untreated outside air opening 35. A wind pressure control plate 71 is attached as a mechanism to assist the wind pressure received by the air volume control plate 51. In addition, an excess air exhaust port 37 is provided to exhaust air when the air volume from the blower is large and excessive pressure is generated inside the adjustment duct 31.

The wind pressure transmission mechanism 7 includes a wind pressure control plate 71 and a connecting member 72 , and the wind pressure control plate 71 is attached via the connecting member 72 to the clean air blowing duct 33 side of the air volume control plate 51 .
The function of the wind pressure transmission mechanism 7 is shown in FIG.
The air volume control plate 51 rotates by receiving wind pressure from the blower 1 through the clean air blowing duct 33. If the state where the clean air blowing duct 33 is fully opened (the state where the untreated outside air opening 35 is completely closed) is taken as a rotation angle of 0°, the position of the air volume control plate 51 where the clean air side opening 34 of the clean air blowing duct 33 is completely closed is a rotation angle of 90°. As the rotation angle θ of the air volume control plate 51 becomes smaller by receiving the wind pressure of the clean air, the wind pressure becomes smaller, and the pressure becomes insufficient to close the untreated outside air opening 35. For this reason, there is a risk of untreated outside air being mixed in even during normal operation of the blower, so an air pressure transmission mechanism 7 is provided as a means of supplementing the pressure.
For example, when the angle of the air pressure control plate 71 is set to 45° with respect to the air volume control plate 51, the air pressure that the air pressure control plate 71 receives directly from the blown clean air is maximized when the rotation angle θ of the air volume control plate 51 is 45°. Also, when the angle of the air pressure control plate 71 is set to 90° with respect to the air volume control plate 51, the air pressure that the air pressure control plate 71 receives from the blown clean air is maximized when the rotation angle θ at which the air volume control plate 51 receives the smallest air pressure is near 0°, so that the air pressure received by the air pressure control plate 71 can be sufficiently used to rotate the air volume control plate 51 to seal the untreated outside air opening 35, thereby preventing the intrusion of untreated outside air.
By attaching this wind pressure transmission mechanism 7 to the air volume control plate 51, when the blower 1 is operated at high output during construction, it is possible to prevent the intrusion of untreated outside air, and when the blower 1 is operated at low output during construction stoppages such as at night, the shortage can be made up for with untreated outside air.

During construction, this outside air supply device operates the blower at a high volume, supplying sufficient clean air to the building's air intake without mixing in untreated outside air. During construction stoppages, such as at night, the blower operates at a low volume, reducing the impact of noise caused by the blower and maintaining quietness for hospitalized patients. Any air that is insufficient due to the low volume of air from the blower is taken in through the untreated outside air opening 35. The wind pressure control plate 71 and the air volume control plate 51 receive the blowing pressure, and when the blower is operating at low power, the rotation stops at the point where the balance is reached. Clean air supplied from the blower side is constantly flowing, preventing fungi from flowing back and adhering to the outlet or the blowing side of the filter and multiplying. Furthermore, by biasing the airflow control plate 51 in the direction that closes the clean air blowing duct 33, the blowing of clean air is strengthened and the backflow prevention function is enhanced. Also, by providing a small opening in the airflow control plate 51 for low airflow, the airflow control plate 51 is in close contact with the clean air side opening 34, preventing fungi from flowing back and causing contamination.

(Embodiment 2)
FIG. 2 shows an example 2 of an outside air supply device using a chamber.
Fig. 2 shows a schematic diagram of the configuration of Example 2 of the outside air supply device. In this example, instead of the adjustment duct 31 of the embodiment 1 shown in Fig. 1, a conditioning chamber 32 is adopted, and the conditioning chamber 32 is directly connected to the air intake 110 of the building. The other configurations are the same as those of the embodiment 1. Explanation of the configurations common to the embodiment 1 will be omitted.
The housing of the conditioning chamber 32 is larger than the connecting duct 16. The clean air side opening 34 provided in the conditioning chamber 32 is smaller than the blower side surface of the conditioning chamber 32. The untreated outside air opening 35 is about the same size as the clean air side opening 34 and is provided on the outer surface of the conditioning chamber 32. The untreated outside air opening 35 leads to the outside air introduction path 41 of the outside air introduction section 4. In this example, an excess air exhaust port 37 is provided on the opposite surface to the clean air side opening 34. The building side side of the conditioning chamber 32 is formed to be about the same size as the air intake 110.
A rotating shaft 53 is provided at the corner where the clean air side opening 34 and the untreated outside air opening 35 are provided, and an air volume control plate 51 is provided so as to be freely rotatable on the rotating shaft 53. An air pressure control plate 71 is provided on the connecting duct 16 side of the air volume control plate 51 on the blower side.

When an adjustment chamber 32 wider than the connecting duct 16 on the blower side is used, the air flow entering the wide chamber from the clean air side opening 34 is likely to diffuse, the air pressure from the clean air blowing duct 33 received by the air volume control plate 51 decreases, and it becomes difficult to block the untreated outside air opening 35 (see FIG. 9(b)).
In this example, even if the air volume control plate 51 rotates, the air pressure control plate 71 receives the wind pressure, which allows the air volume control plate 51 to further rotate. When a large volume of air is supplied from the blower, this wind pressure can be received to close the untreated outside air opening 35, thereby preventing the intrusion of untreated outside air during construction (see FIG. 9(a)).

<Air flow adjustment mechanism>
Examples of the airflow adjustment mechanism are shown in Figures 3 and 4. Figure 3 shows an example in which the airflow adjustment mechanism is applied to a regulated duct, and Figure 4 shows an example in which the airflow adjustment mechanism is applied to a regulated chamber.
3, (a) shows the state where the air volume control plate 51 of the adjusting duct 31 closes the clean air blowing passage 33, (b) shows the state where the air volume control plate 51 is rotated to the middle position, and (c) shows the state where the air volume control plate 51 closes the untreated outside air opening 35. In addition, in FIG. 3, a three-dimensional view is shown in the upper part, and a plan view is shown in the lower part. The adjusting duct is mainly applied to the embodiment 1 shown in FIG. 1. The structural explanation is the same as that in FIG. 1 and is described in the embodiment 1, so the details are omitted.

The airflow adjustment mechanism 5 is equipped with an airflow control plate 51 that can rotate to close the clean air side opening 34 and the untreated outside air opening 35, and an air pressure transmission mechanism 7 attached to the airflow control plate 51. The air pressure transmission mechanism 7 is composed of an air pressure control plate 71 that receives air pressure (dynamic pressure) from the blower 1, and a connecting member 72 that is attached to the airflow control plate 51 and connects the air pressure control plate 71.

In the state (a) in which the air volume control plate 51 closes the clean air blowing passage 33, the air volume control plate 51 comes into contact with a control plate stopper 34a to close the clean air blowing passage 33. The air pressure control plate 71 is attached at an angle to the clean air blowing passage 33 via a connecting member 72.
When the air volume control plate 51 is rotated to the intermediate position (b), the air pressure control plate 71 faces the clean air blowing duct 33 and is subjected to a large amount of wind pressure from the blower, urging the air volume control plate 51 in the direction of rotation toward the untreated outside air opening 35.
In the state (c) in which the air volume control plate 51 is blocking the opening 35 for untreated outside air, the air pressure control plate 71 is at an angle to the clean air blowing duct 33 and receives the wind pressure of the air sent from the blower (particularly when the set angle of the air pressure control plate 71 approaches 90°, the air pressure of the air sent from the blower is greater), and the air volume control plate 51 applies pressure to block the opening 35 for untreated outside air.
In particular, in the state (c), the air volume control plate 51 cannot receive the wind pressure from the clean air blowing duct 33, so it is susceptible to gaps being formed under the pressure of untreated outside air, increasing the risk of untreated outside air entering through the gaps, but the air pressure control plate 71 presses the air volume control plate 51 against the untreated outside air opening 35, so that the air volume control plate 51 comes into close contact with the control plate stopper 43, preventing outside air from entering. By providing the air pressure transmission mechanism 7, it is possible to prevent the risk of untreated outside air being supplied to the building during construction work to blow clean air at a large volume from the blower.

In FIG. 4, (a) shows the conditioning chamber 32 in a state where the air volume control plate 51 closes the clean air blowing duct 33, (b) shows the air volume control plate 51 in a rotated intermediate position, and (c) shows the air volume control plate 51 in a state where it blocks the untreated outside air opening 35. Also, in FIG. 4, a three-dimensional view is shown at the top and a plan view is shown at the bottom. The conditioning chamber is mainly applied to embodiment 2 shown in FIG. 2. The structural explanation is the same as in FIG. 2 and is described in embodiment 2, so details will be omitted.

The airflow adjustment mechanism 5 includes an airflow control plate 51 that can rotate to close the clean air side opening 34 and the untreated outside air opening 35, and an air pressure transmission mechanism 7 attached to the airflow control plate 51. The air pressure transmission mechanism 7 is composed of an air pressure control plate 71 that receives air pressure (dynamic pressure) from the blower 1, and a connecting member 72 that is attached to the airflow control plate 51 and connects the air pressure control plate 71.
The explanation of the air volume control plate 51 and the air pressure control plate 71 shown in Figs. 4(a), 4(b) and 4(c) is omitted since they are the same as those in Figs. 3(a), 3(b) and 3(c).
However, since a chamber is used, the air that enters from the clean air side opening 34 and the untreated outside air opening 35 spreads inside the large chamber, and the wind tends to diffuse and the wind pressure that hits the air volume control plate 51 tends to weaken (see FIG. 8). Therefore, it is more effective to provide an air pressure control plate 71 to bias the rotation of the air volume control plate 51.
In particular, in the state (c), the air volume control plate 51 cannot receive the air pressure from the clean air blowing duct 33, so the air pressure control plate 71 presses the air volume control plate 51 against the untreated outside air opening 35, causing the air volume control plate 51 to adhere to the control plate stopper 43, thereby preventing outside air from entering. By providing the air pressure transmission mechanism 7, it is possible to prevent the risk of untreated outside air being supplied to the building during construction work in which clean air is blown at a large volume from the blower.
In the conditioning chamber, untreated outside air that is supplied when the clean air supply is low or stopped flows in through the outside air intake, passes through the larger chamber, and travels almost straight to the building's air intake. Therefore, even if the clean air supply stops, as long as the intake from the air intake does not stop, it is sufficient to rotate the air volume control plate toward the clean air supply duct to prevent backflow into the clean air supply duct, and it does not necessarily have to be closed.

<Wind pressure transmission mechanism>
The wind pressure transmission mechanism 7 will be described with reference to FIGS.
The air pressure transmission mechanism 7 has an air pressure control plate 71 attached to the clean air blowing passage side of the air volume control plate 51 by using a rod-shaped connecting member 72 .
5 shows an example of adjusting the position and posture of the wind pressure control plate 71 by adjusting the mounting angle and expanding/contracting the connecting member 72. Fig. 5(a) shows a state in which the angle at which the connecting member 72 is mounted to the wind pressure control plate 71 can be adjusted, (b) shows a state in which the rod member of the connecting member 72 is expanded and contracted to adjust the wind pressure control plate 71, and (c) shows a state in which the mounting angle of the connecting member 72 and the wind pressure control plate 71 can be adjusted. These structures (a), (b), and (c) can be combined. Furthermore, multiple wind pressure control plates can be provided, and by combining the structures (a), (b), and (c), more situations can be accommodated.

The connecting member 72 connecting the air pressure control plate 71 and the air volume control plate 51 is preferably a rod-shaped member so as to minimize resistance to airflow, and may be of an articulated type, or may be of multiple joints. The connecting member 72 may be a rod-shaped member whose length can be adjusted, with one end having a mechanism for connecting to the air volume control plate 51, and the other end having a mechanism for connecting to the air pressure control plate 71. The connecting mechanism with the air volume control plate 51 may be, for example, a rod-shaped member with a tip attached to a base plate screwed to the air volume control plate 51, and may be attached so as to be movable up, down, left, and right when a load is applied.
Alternatively, the tip of the rod-shaped body can be attached to a magnetic platform and fixed by magnetic force to a thin iron plate attached to a specified position on the air volume control board; if a neodymium magnet with strong magnetic force is used, the fixation can be made even more stable.
The connection mechanism with the wind pressure control plate 71 is fixed, for example, via an auxiliary jig attached to the tip of a rod-shaped body. The auxiliary jig can be equipped with a means for moving up, down, left, and right when a load is applied to the tip of the rod-shaped body, thereby changing the angle of the wind pressure control plate 71. The auxiliary jig can be fixed to the wind pressure control plate 71 by known means such as clamping or screwing.

The air pressure transmission mechanism 7 is provided on the surface of the air volume control plate 51 facing the clean air blowing duct 33, and is positioned so as not to come into contact with the receiving structure (stoppers 34a, 43) provided at the location that closes the clean air blowing duct 33 or the opening 35 for untreated outside air when the air volume control plate 51 is in operation.
However, since the clean air side opening does not necessarily have to be closed in the conditioning chamber, contact with the receiving structure provided in the clean air blowing path of the wind pressure transmission mechanism 7 is permitted.
The wind pressure transmission mechanism 7 can be provided on the surface of the air volume control plate 51 on the side of the clean air blowing duct 33 as well as on the side of the outside air introduction duct 41 (see FIG. 11). When the wind pressure transmission mechanism 7 is provided on the side of the outside air introduction duct, it receives wind pressure from the untreated outside air opening 35, so that the power to close the clean air blowing duct 33 when the blower stops operating can be increased, and it is possible to prevent untreated outside air from flowing back to the blower side and causing fungi to adhere to the filter.

The air pressure transmission mechanism 7 can freely change the position and angle of the air pressure control plate 71 by moving the connecting member 72 up, down, left, and right and expanding and contracting, changing the attachment position to the air volume control plate, and adjusting the angle of the air pressure control plate 71 up, down, left, and right.
When installing the outside air supply device of the present invention, the wind speed distribution in the clean air supply duct 33 is simulated or measured to identify the range of strong wind speeds, and the position and angle of the wind pressure control plate are changed so that the wind pressure control plate 71 receives the strong wind in an optimal position, and the force with which the air volume control plate 51 blocks the outside air introduction path 41 can be strengthened.
An inspection door can be provided in the adjustment duct or adjustment chamber to allow the position of the air pressure control plate to be checked and adjusted.

FIG. 6 illustrates a mechanism for changing the size of the wind pressure control plate 71.
Figure 6 (a) shows the state in which the wind pressure control plate 71 can be stretched horizontally to adjust the size, (b) shows the state in which the wind pressure control plate 71 can be stretched vertically to adjust the size, and (c) shows the state in which the wind pressure control plate 71 can be stretched vertically and horizontally to adjust the size.
The wind pressure control plate 71 can be provided with a mechanism for adjusting its size in the horizontal and vertical directions, and the size can be adjusted by sliding or opening and closing.
For example, by providing a horizontal size adjustment mechanism on one side and a vertical size adjustment mechanism on the other side, it is possible to adjust the size in three ways: horizontal only, vertical only, or both directions. It is also possible to adjust the size by replacing wind pressure control plates 71 of different sizes and shapes. Furthermore, by making the size adjustment mechanism openable and closable, the opening and closing angle can be adjusted, so that the wind pressure can be received more efficiently.

<Operation of air volume adjustment mechanism>
7 to 11 show the operation of various air volume adjustment mechanisms equipped with an air pressure control mechanism. They show the difference in the movement of the air volume control plate 51 during low air volume operation and high air volume operation depending on whether the air pressure control plate 71 is present or not, and show that there are cases where the air volume control plate alone cannot completely block the outside air introduction passage even during high air volume operation due to the large distribution of wind speed of the blown air, and that the air pressure control plate assists the air volume control plate to stably block the outside air introduction passage.
It is preferable that the angle between the air pressure control plate and the air volume control plate be as close to 90° as possible.

<Air volume control plate operation 1>
7 shows an example of the operation of the adjusting duct 31 shown in FIG. 1 in which the air pressure control plate 71 is attached to the air volume control plate 51. Fig. 7(a) shows the case with the air pressure control plate, and Fig. 7(b) shows the case without the air pressure control plate.
When the air pressure control plate 71 is provided, the wind pressure of the clean air supplied from the blower is weak at low air volume, so that untreated outside air can enter through the outside air introduction passage depending on the air intake demand of the building, and the air volume control plate 51 can rotate to a position where the wind pressures of both are balanced. When clean air is supplied from the blower at a high volume, the air pressure control plate 71 urges the air volume control plate 51 to rotate, so that the air volume control plate 51 can seal the outside air introduction passage 41, preventing the intrusion of untreated outside air.
In contrast, if the air pressure control plate is not provided, when the volume of air supplied from the clean air supply duct 33 is low, the air volume control plate 51 will rotate to a position where the two air pressures are balanced, regardless of the presence of the air pressure control plate. However, when a large volume of air is supplied from the blower, the air pressure weakens as the air volume control plate 51 rotates more, and a gap Δd is likely to occur due to the air pressure entering the outside air introduction duct 41, creating the risk of untreated outside air being mixed in.

An example of the operation of the adjustment chamber 32 shown in FIG. 2 is shown in FIG. 8. FIG. 8(a) shows the case with the wind pressure control plate, and (b) shows the case without the wind pressure control plate. The operation of the air volume control plate 51 with and without the wind pressure control plate 71 is basically the same as that of the adjustment duct shown in FIG. 7, but since air that has entered the chamber diffuses, the instability of the air volume control plate 51 increases if the wind pressure control plate 71 is not provided. In contrast, if the wind pressure control plate 71 is provided, the wind pressure control plate 51 can be biased during times of high air volume to prevent outside air from entering.

<Operation of the air volume control plate 2>
9 and 10 show an example in which a plurality of air volume control plates 51 are provided. Note that the structure of this outside air intake mechanism is common to the mechanism introduced in Figures 3, 4, 6, and 8 of the prior patent application, Japanese Patent Application No. 2019-3471.
Fig. 9 shows an example in which an adjustment duct 31 is used, and a clean air blowing duct 33 and an outside air introduction duct 41 are provided in parallel. Fig. 9(a) shows an example in which an air flow control plate 51 is composed of plates 51a and 51b arranged at a right angle (two-blade right-angle type). Fig. 9(b) shows an example in which the length of the air pressure control plate is made larger than the cross-sectional length of the clean air blowing duct, the blocking position is on the downstream side of the blowing duct, and the plates 51a and 51b, which are the air flow control plates 51, are arranged at an acute angle (two-blade acute-angle type).
When the air volume is low, the plate 51a rotates to a position where the wind pressure it receives from the clean air supply duct 33 and the wind pressure on the plate 51b from the outside air introduction passage 41 are balanced, but when the air volume is high, the wind pressure received by the wind pressure control plate 71 biases the plate 51a, so that the plate 51b can close the outside air introduction passage 41.

The influence of the air volume control plate on the sealing stability of the outside air introduction passage, depending on whether or not there is an air pressure control plate 71, is similar to that of the mechanism shown in Figures 7 and 8, so here an example in which a air pressure control plate is provided is shown.
The same applies to the conditioning chamber.

<Air volume control plate operation 3>
Fig. 10 shows an example in which two air flow control plates are provided. Although an example using an adjustment duct is shown, the same effect can be obtained even if an adjustment chamber is used.
10(a) shows a configuration in which the clean air blowing duct 33 and the outside air introduction duct 41 are installed in parallel, a two-blade right-angle type air volume control plate with air volume control plates 51a and 51b arranged at right angles is installed on the downwind side, and an air volume control plate 51c is provided on the upstream side of the clean air blowing duct 33. The tip of the upstream air volume control plate 51c and the tip of the air volume control plate 51b are connected by a linear tension 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.
An air pressure control plate 71 is attached to the upstream air volume control plate 51c.
When the air volume is low, the air volume control plate 51b receives the pressure of the outside air supplied from the outside air introduction passage, and the two-blade right-angled air volume control plate rotates to the middle position. When the air volume is high, the upstream air volume control plate 51c receives the force of the air pressure control plate 71, rotates widely, and the air volume control plate 51b can completely close the outside air introduction passage 41 via the linear tension member 56.

10B shows a configuration in which the outside air introduction passage 41 is connected to the downwind side of the clean air blowing passage 33, an outside air introduction passage opening/closing plate 61 is provided at this connection portion to close the outside air introduction passage 41, and an air volume control plate 51c is provided on the upstream side of the clean air blowing passage 33. Air pressure control plates 71e and 71f are attached to the outside air introduction passage opening/closing plate 61 and the upstream air volume control plate 51c. The outside air introduction passage opening/closing plate 61 is attached so as to rotate toward the clean air blowing passage side, and the air pressure control plate 71 is attached to the upwind side of the clean air blowing passage 33 of the outside air introduction passage opening/closing plate 61. The tip of the upstream air volume control plate 51c and the tip of the outside air introduction passage opening/closing plate 61 are connected by a linear pulling member 56, and the outside air introduction passage opening/closing plate 61 and the air volume control plate 51c open and close in conjunction with each other.
When the air volume is low, the outside air introduction path opening/closing plate 61 receives the outside air supplied from the outside air introduction path and rotates toward the clean air blowing path 33 to introduce the outside air. When the air volume is high, the upstream air volume control plate 51c is biased by the wind pressure control plate 71e, and the wind pressure of the wind pressure control plate 71f is also applied to the outside air introduction path opening/closing plate 61, so that the outside air introduction path opening/closing plate 61 can completely close the outside air introduction path 41.

10(c), an outside air introduction passage 41 is provided on the opposite side of the adjustment duct, and a supply air passage 36 is provided in the middle that leads to an air intake port on the building side. An upstream air volume control plate 51c with an air pressure control plate 71 attached is provided in the clean air blowing passage 33, and an outside air introduction passage opening/closing plate 62 is provided on the outside air introduction passage 41 side. The tip of the upstream air volume control plate 51c and the tip of the outside air introduction passage opening/closing plate 62 are connected by a linear tension member 56, and the outside air introduction passage opening/closing plate 62 and the air volume control plate 51c open and close in conjunction with each other.
When the air volume is low, the outside air introduction path opening/closing plate 62 receives the outside air supplied from the outside air introduction path and rotates toward the clean air blowing path 33 to introduce the outside air. When the air volume is high, the upstream air volume control plate 51c rotates significantly under the force of the air pressure control plate 71, and the outside air introduction path opening/closing plate 62 rotates through the linear tension member 56 to completely close the outside air introduction path 41.

<Operation of the air volume control plate 4>
FIG. 11 shows an example in which air pressure control plates are provided on both the clean air blowing passage side and the outside air intake passage side.
FIG. 11( a) shows an example of an adjustable damper type in which a clean air blowing duct 33 and an outside air introduction duct 41 are installed in parallel, a two-blade right-angled air volume control plate with air volume control plates 51 a, 51 b arranged at a right angle is installed at the junction end, and an air pressure control plate 71 e is provided on the air volume control plate 51 a on the upwind side of the clean air blowing duct 33, and an air pressure control plate 71 g is provided on the air volume control plate 51 b on the upwind side of the outside air introduction duct 41.
When the air volume is low, the air volume control plate 51b receives the pressure of the outside air supplied from the outside air introduction passage, and the two-blade right-angled air volume control plate rotates to the middle position. If the air pressure on the clean air blowing passage 33 side is unexpectedly greater than the air pressure on the outside air introduction passage 41 side, the outside air introduction may be insufficient, and excessive burden may be placed on the intake power on the building side. However, the air pressure control plate 71g biases the air volume control plate 51b, so that the degree of opening on the outside air introduction passage 41 side increases, and the outside air is smoothly introduced.
When the air volume is large, the air volume control plate 51 a is biased by the air pressure control plate 71 e and rotates widely, so that the air volume control plate 51 b can completely close the outside air introduction passage 41 .

11(b) shows an adjusted chamber type in which the clean air blowing duct 33 and the outside air introduction duct 41 are installed at right angles, and an air volume control plate 51 is installed at the joining end, with air pressure control plates 71e and 71g provided on both sides of the air volume control plate 51. The air pressure control plate 71e faces the clean air blowing duct 33, and the air pressure control plate 71g faces the outside air introduction duct 41.
When the air volume is low, the air volume control plate 51 receives the pressure of the outside air supplied from the outside air inlet passage. If the wind pressure on the clean air supply duct 33 side is unexpectedly greater than the wind pressure on the outside air inlet passage 41 side, the introduction of outside air may be insufficient, which may cause an excessive burden on the intake power on the building side. However, the wind pressure control plate 71g biases the air volume control plate 51, so that the degree of opening on the outside air inlet passage 41 side increases, and outside air is introduced smoothly.
When the air volume is large, the air volume control plate 51 is biased by the air pressure control plate 71 e and rotates widely, so that the air volume control plate 51 b can completely close the outside air introduction passage 41 .

<Design and operation of outdoor air supply equipment>
The present invention is an air purification system that can supply air from which dust and fungi (mold) have been largely removed during normal operation, in which clean air is supplied from a blower at a large volume to the outside air intake during intake, and can prevent contamination of the downstream surface of the filter due to backflow even if the fluctuating amount of outside air introduced is temporarily or for a certain period of time excessive, while introducing outside air to make up for the lack of air volume during low air volume operation, so that even when normal operation and low air volume operation are repeated, the intake volume is secured and air from which dust and fungi have been largely removed during normal operation can be supplied. In particular, even when the air pressure received by the air volume control plate which has been rotated greatly becomes small during high air volume operation, and the pressure to close the outside air introduction path becomes unstable, the air pressure control plate biases the air volume control plate in the direction to close the outside air introduction path, so that the blocking of the outside air introduction path is stable and the mixing of untreated outside air can be prevented.
In addition, since the mechanism is simple, it can be implemented at low cost, and since it can be implemented without using electricity other than the fan, it is less susceptible to the effects of rain or temperature changes.

At the construction site to which the present invention is applied, it is necessary to respond to the following conditions, and the present invention is suited to these demands.
As a temporary measure to be used only during the demolition work, one possible method would be to install a dust and mold removal device equipped with a filter and fan on the outdoor side of the outside air intake, and connect it via a duct or other means to supply clean air (air that has had dust and mold largely removed) to the outside air intake.
The dust and mold removal means is equipped with a fan, which generates direct noise and vibration from the unit when in operation, as well as indirect noise and vibration through the duct. Because hospitals cater to patients who must remain quiet for long periods of time, they are required to be more considerate about noise and vibration than ordinary buildings, and noise and vibration can be disruptive to medical procedures such as examinations and consultations. For these reasons, measures are only necessary during demolition work hours, when a lot of dust and mold is scattered. As these measures are only necessary during demolition work hours, it is permissible to introduce outside air during work halts, when there is less scattering of dust and mold.
When the fan is stopped, mold spores that have entered through the openings of the opening/closing mechanism installed to ensure the amount of air supplied to the hospital adhere to the downstream side of the filter of the fan (the side opposite the filter side that removes dust and mold during normal operation) and may grow on the filter surface, especially in high humidity conditions such as rainy weather. Since normal operation with this fungus adhering will result in contaminated air being supplied from the contaminated filter, it is necessary to avoid stopping the fan and operate it at a low air volume (as it will be used outdoors, there is also a concern that the risk of condensation increasing when the fan is turned on and off in winter, etc.).

Since the air intakes are located in various places such as the upper floors of the building, an outside air intake mechanism is installed at the connection (duct, etc.) between the blower and the building's air intake, but the air flow passing through the connection is often biased and the wind speed distribution is often large. For example, since the blower is generally installed at a lower position than the building's air intake, if it is connected with a duct, there is a bend in front of the air intake, and the wind speed distribution inside the duct becomes large (the wind speed outside the bend is faster than the inside). In addition, since the horizontal wind speed distribution inside the duct is slower near the side than the center, the air volume control plate of the outside air intake mechanism installed on the side moves in the direction of blocking the outside air intake during normal operation, but the wind speed acting on the air volume control plate slows down as it approaches the outside air intake. Furthermore, if the outside air intake mechanism is installed at the rear of the duct bend, the vertical wind speed acting on the air volume control plate is not uniform and is concentrated at the top.
As such, the wind speed acting on the air volume control plate is not uniform across the entire plate, and the horizontal wind speed slows down the closer it is to the outside air inlet. Therefore, the air volume adjustment mechanism is designed to adjust the wind pressure control mechanism and control the air volume control plate to completely block the outside air inlet.

[experiment]
During normal operation, the effect of blocking the outside air intake was verified by adjusting the opening angle of the air volume control plate using the air pressure control plate.

[Air flow adjustment mechanism applied to the conditioning chamber]
As shown in Figures 12(a) and 13, a chamber 32 equipped with an air flow adjustment mechanism 5 was connected to an air intake 110 on the exterior wall of the building. The chamber 32 had a height of 1100 mm, a long side of 2400 mm, and a short side of 700 mm, and a clean air side opening 34 was provided on the short side to which a fan equipped with a filter was connected via a 400 mm diameter flexible duct (connection duct 16), allowing clean air that passed through the filter to rise and be supplied into the chamber.
On the long side of the chamber 32, a 500mm x 500mm opening 35 for untreated outside air is provided at a position 50mm from the duct connection side, and an outside air intake section 4 is installed. In application to the conditioning chamber 32, when the blowing of clean air is low or stopped, the untreated outside air that is supplied flows in from the outside air intake section 4, passes through the wider chamber space, and advances almost straight to the air intake 110 of the building and is sucked in. Therefore, even if the blowing of clean air stops, as long as the intake from the air intake 110 does not stop, it is sufficient to force the rotation of the air volume control plate 51 toward the clean air blowing path to prevent backflow to the clean air blowing path, and it is not necessarily necessary to close it. In addition, as a duct connection to the clean air side opening, a clean air side opening 34 of the same size as the opening 35 for untreated outside air may be provided, and a square duct, a round duct, or a flexible duct may be connected via a square elbow or the like.
A rotatable 520 mm x 520 mm air volume control plate 51 for opening and closing the outside air inlet was attached to the opening 35 for introducing untreated outside air, and an air pressure control plate 71 was provided on the clean air blowing duct side of the air volume control plate 51 via two connecting members 72 arranged 80 mm apart.
The air pressure control plate 71 is fixed in a straight line to the connecting member 72 by a clip-type clamping mechanism provided at the tip of the connecting member 72, and a magnetic platform is provided at the base of the connecting member 71, and the plate is fixed by magnetic force so as to be perpendicular to a thin iron plate affixed to a predetermined position on the air volume control plate 51. The air pressure control plate 71 can also be fixed at an angle by the clip-type clamping mechanism.

[Air flow adjustment mechanism applied to adjustment duct]
12(b) and 14, a duct-type air passage (adjustment duct 31) with a height of 580 mm, long sides of 730 mm, and short sides of 600 mm was provided in the adjustment chamber on the side of the air volume control plate 51. The surface of the duct-type air passage on the side of the air volume control plate is open only by a support rod, so there is no hindrance to opening and closing the air volume control plate.

[Air flow]
Although the air volume at the intake port 110 fluctuates slightly, the total air volume measured at the clean air side opening 34 and the untreated outside air opening 35 of the chamber 32 was approximately 3100 to 3200 m ³ /h, so the air volume at the blower outlet was set to 3240 m ³ /h.

[Vertical wind speed around the airflow adjustment mechanism]
In this embodiment, the chamber 32 is located higher than the blower, so the clean air rises and turns 90 degrees just before the chamber entrance before being supplied, but when the vertical wind speed around the air flow adjustment mechanism inside the chamber 32 was checked by holding a hand over the outside air opening, it was found to increase significantly above the center of the clean air side opening 34 (the center of the air volume control plate 51) regardless of whether a duct-type air flow duct was present.

[Connecting member length]
The length a of the connecting member 72 was set to 90 mm and 140 mm.

[Vertical position of wind pressure control plate]
As shown in Figures 13 and 14, the vertical position of the air pressure control plate 71 is represented by the distance b between the center of the air pressure control plate and the lower end of the air volume control plate 51, and is set to 250 mm and 290 mm.

[Horizontal position of wind pressure control plate]
As shown in Figs. 13 and 14, the horizontal position of the air pressure control plate 71 is represented by the distance c from the rotation axis 53 of the air volume control plate 51, and is set to 250 mm and 330 mm.

[Size of wind pressure control plate]
The dimensions d×e of the wind pressure control plate 71 are common to 200 mm×200 mm, 245 mm×163 mm, and 163 mm×245 mm, as well as larger common areas of 250 mm×250 mm, 306 mm×204 mm, and 204 mm×306 mm.

[Air volume control plate opening evaluation test]
As shown in FIG. 15, the index representing the opening degree of the air volume control plate 51 (opening degree from the opening for untreated outside air) is the distance x between the tip of the air volume control plate 51 and the opening for untreated outside air 35, and was measured by inserting a scale into the opening for untreated outside air.
The value of x is
0 (airflow control plate completely closed) is rated ◎;
If it is less than 20mm, it is rated 〇.
If it is between 20mm and 40mm, it is rated △.
If it is 40mm or more, it is rated ×.
It was decided.

[Experiment 1]
For the airflow adjustment mechanism applied to the adjustment duct 31, an experiment was conducted on opening and closing the airflow control plate by changing the length of the connecting member, the position of the airflow control plate, and the size and shape of the airflow control plate. The results of the opening degree of the airflow control plate under each condition are shown in Table 1. When there was no airflow control plate, it was 150 mm (opening degree about 15°).

[summary]
The air pressure control plate 71 of all sizes and shapes was able to completely close the air volume control plate 51, and in particular, the larger area shape of each shape was able to close the air volume control plate 51 under almost all conditions.
When it is desired to reduce the resistance to airflow, air volume control plate 51 can be closed by adjusting the vertical position or length of plate 51 upward even if the area is smaller.
When comparing only the difference in b, the opening angle was kept equal to or less for 290 mm than for 250 mm under all conditions.
That is, shifting the position of the air pressure control plate 71 upward by 40 mm increased the effect of reducing the opening degree. Furthermore, under the condition that the air volume control plate 51 was closed, the same effect was obtained even if the air pressure control plate 71 was tilted 5 degrees forward or backward with respect to the connecting member 72.
In the air flow adjustment mechanism applied to the adjustment duct 31, when the air pressure control plate 71 was not present, the index representing the opening degree of the air volume control plate 51 was 150 mm, but it was confirmed that providing the air pressure control plate 71 has the advantageous effect of allowing the air volume control plate 51 to be completely closed.

[Experiment 2]
For the airflow adjustment mechanism applied to the conditioning chamber 32, an experiment was conducted on opening and closing the airflow control plate 71 by changing the length of the connecting member 72, the position of the airflow control plate 71, and the size and shape of the airflow control plate 71. The opening degree results of the airflow control plate 51 under each condition are shown in Table 2. When there was no airflow control plate 71, it was 160 mm (opening degree about 16°).

[summary]
It was possible to completely close the air volume control plate 51 with all sizes and shapes of the air pressure control plate 71, and in particular, the larger area of each shape was able to close the air volume control plate 51 under all conditions. If it is desired to reduce the air flow resistance, it is possible to close the air volume control plate 51 even with the smaller area by adjusting the vertical position upward so that the horizontal position is away from the rotation axis.
In other words, since there is no duct-type air passage, the clean air supplied into the chamber 32 is easily affected by the air intake 110, but it was confirmed that the air volume control plate 51 can be closed by adjusting the horizontal position of the air pressure control plate 71.
When comparing only the difference in b, the opening angle was kept equal to or less for 290 mm than for 250 mm under all conditions.
That is, shifting the position of the air pressure control plate 71 upward by 40 mm increased the effect of reducing the opening degree. Furthermore, under the condition that the air volume control plate 51 was closed, the same effect was obtained even if the air pressure control plate 71 was tilted 5 degrees forward or backward with respect to the connecting member 72.
In the air flow adjustment mechanism applied to the adjustment chamber 32, when the air pressure control plate 71 was not present, the index representing the opening degree of the air volume control plate 51 was 160 mm, but it was confirmed that providing the air pressure control plate 71 has the advantageous effect of allowing the air volume control plate 51 to be completely closed.

[Comparison between Experiments 1 and 2]
From a comparison between Experiments 1 and 2, it was confirmed that the effect of closing the air volume control plate 51 was assisted by providing a duct-type air passage (adjustment duct 31) in the air flow adjustment mechanism 5 applied to the adjustment chamber 32.

[Embodiment 3]
An example of the airflow adjustment mechanism applied to the conditioning chamber 32 is shown in Figures 16 to 18. In Figure 16, for the airflow adjustment mechanism 5 having two airflow control plates 51a, 51b connected at a position away from the rotation shaft, (a) shows the state in which the airflow control plate 51b closes the untreated outside air opening 35, and (b) shows the state in which the airflow control plate 51a closes the clean air side opening 34.
The airflow adjustment mechanism 5 is equipped with air volume control plates 51a, 51b that can be rotated to close the clean air side opening 34 and the untreated outside air opening 35, which are located at positions away from the ends of the chamber 32 (not necessarily at the same length).
The air volume control plates 51a, 51b, the air volume control plate 51a which closes the clean air side opening and the air volume control plate 51b which closes the untreated outside air opening, are attached to the rotating shaft 53 via a connecting member 54. A rod-shaped body is suitable for the connecting member 54 so as not to cause airflow resistance and also from the viewpoint of light weight, and an example is shown in which it is attached to the upper and lower sides of the air volume control plates 51a, 51b.
The number and positions of the rods are arbitrary, but they have the function of keeping the angle of the air volume control plates 51 a, 51 b constant. The rods may be of any length as long as they are positioned so that the air volume control plates 51 a, 51 b can close the clean air side opening 34 and the untreated outside air opening 35, respectively.
From the results of experiment 2, in the conditioning chamber 32 to which the airflow adjustment mechanism 5 is applied, the opening angle of the airflow control plate 51 (opening angle from the untreated outside air opening) without the air pressure control plate 71 during normal operation was 16°. The position of the rotation shaft 53 and the number of airflow control plates 51 are different from those in this embodiment, but it is possible to rotate the airflow control plate 51a during normal operation to supply clean air, and the airflow control plate 51b to close the untreated outside air opening 35. In this embodiment, the connecting duct 16 to the clean air blowing duct is a round duct or a flexible duct connected via a square elbow, but the clean air side opening 34 can also be made circular and a flexible duct can be directly connected.

[effect]
Even if the clean air side opening 34 and the untreated outside air opening 35 are located away from the end of the chamber 32 (they do not have to be at the same distance), the clean air supply duct can be opened during normal operation of the blower, the outside air intake section can be blocked, and clean air can be supplied to the building's air intake.
When the clean air side opening 34 and the untreated outside air opening 35 are provided adjacent to the ends of the chamber 32, and the rotating shaft 53 and air volume control plate 51 (one piece) are provided between these openings, the maximum opening angle of the air volume control plate 51 (opening angle from the clean air side opening) is 90°. In this embodiment, the opening angle is smaller than this, but since a space is created between the clean air side opening 34 and the air volume control plate 51, it is possible to compensate for the amount of air blown.

In Figure 17, the air flow adjustment mechanism has two air volume control plates 51a, 51b connected at a position away from the rotation shaft 53 and shifted vertically. FIG. 17(a) shows the state in which the air volume control plate 51b closes the opening 35 for untreated outside air, and FIG. 17(b) shows the state in which the air volume control plate 51a closes the opening 34 for clean air.
The structural explanation is the same as that in FIG. 16, except that the air volume control plates 51a, 51b are shifted vertically away from the rotation shaft 53, and since this is described in embodiment 3, details will be omitted.

In Fig. 18, two air volume control plates 51a, 51b are connected at a position away from the rotating shaft 53, and an air pressure control plate 71 is provided on the clean air side air volume control plate 51a. For the air flow adjustment mechanism 5, (a) shows the state in which the air volume control plate 51b closes the untreated outside air opening 35, and (b) shows the state in which the air volume control plate 51a closes the clean air side opening 34. The structural explanation other than the attachment of the air pressure control plate 71 is the same as in Fig. 16 and is described in embodiment 3, so details will be omitted, but by attaching the air pressure control plate 71 to the air volume control plate 51a, the outside air opening can be sealed more reliably.

1 Blower 11 Filter 12 Base 13 Motor 14 Fan 15 Vibration-proof member 16 Blower-side connection duct 2 Outside air intake mechanism 31 Adjustment duct 32 Adjustment chamber 33 Clean air blowing duct 34 Clean air side opening 34a Control plate stopper 35 Opening for untreated outside air 36 Supply air duct 37 Excess air exhaust port 4 Outside air intake section 41 Outside air intake path 42 Outside air opening 43 Control plate stopper 5 Airflow adjustment mechanism 51, 51a, 51b, 51c Air volume control plate 53 Rotating shaft 54 Connection member 56 Linear tension member 61, 62 Outside air intake path opening/closing plate

7 Wind pressure transmission mechanism 71, 71e, 71f, 71g Wind pressure control plate 72 Connection member

110 Air intake

Claims (5)

A fresh air supply device that is connected to an air intake of a building and has a blower with a filter and an fresh air intake mechanism,
The outside air intake mechanism includes a clean air blowing duct through which air that has passed through a filter from a blower flows, an outside air introduction section having an untreated outside air opening that is provided downstream of the filter and that introduces untreated outside air, and an air blowing adjustment mechanism that adjusts the opening of the clean air blowing duct and the untreated outside air opening ;
The airflow adjustment mechanism has a rotatable airflow control plate that opens and closes the clean air blowing passage and the untreated outside air opening, and an air pressure transmission mechanism;
The outside air supply device is characterized in that the wind pressure transmission mechanism includes a wind pressure control plate that controls (amplifies) the wind pressure on the clean air blowing passage side that the air volume control plate receives . The outside air supply device according to claim 1, characterized in that the air flow adjustment mechanism is provided with a rotatable air volume control plate which opens and closes the clean air supply duct and the opening for untreated outside air , and is provided with an air volume control plate which is common to both the clean air supply duct and the opening for untreated outside air, or a separate air volume control plate which opens and closes each of them and is formed so that they can be linked together. 3. The outside air supply device according to claim 1, wherein the air pressure control plate is connected to the blower side of the air volume control plate via a connecting member capable of adjusting the attitude of the air pressure control plate. 4. The outside air supply device according to claim 1, wherein the building having the air intake is a hospital, and the device is a temporary device used during construction of an adjacent building. A method for supplying outside air to a building, comprising the steps of: (1) operating at a high air volume exceeding the intake volume of the building when construction work on an adjacent building is underway; and (2) operating at a low air volume when construction work on the adjacent building is suspended.