JP2023047271A - Local ventilation system for store - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a local ventilation system for a store to prevent infection in consideration of a proper suction position, an airflow, an amount of ventilation, etc. for preventing diffusion of droplets and the like in a space at customer seats in restaurants and the like which are used by many and unspecified persons, and tend to be crowded.

SOLUTION: A dedicated suction port is arranged at each seat for sucking breath discharged by each person forcedly before it diffuses in a space. Fresh air is taken in from an outdoor suction instrument 2, conveyed by an outside air duct 5, and supplied from a ceiling surface blowout port 7 by using, as a power source, a conveyance device of a ventilation instrument 4 consisting of an existing ventilation device, a newly installed total enthalpy heat exchanger, or an air blower/exhauster. As for exhaust, exhaust of an exhaust air duct 6 collected from each counter side locally and exhaust of an exhaust air duct 6 collected from each table side locally are merged, and the merged exhaust is discharged outdoors from an exhaust port 3 for ventilation through the ventilation instrument 4 consisting of a total enthalpy heat exchanger or an air blower/exhauster.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

Each seat has its own air intake.
TECHNICAL FIELD The present invention relates to a local ventilation system for a store for reducing the risk of infection to other people living in an indoor living space by installing an exhaust air inlet for each seat in a restaurant or the like.

Conventionally, in a yakiniku restaurant where an iron plate is attached to the table, a local exhaust system is known for locally ventilating the heat, oily smoke, and contaminated air generated by cooking heating before they diffuse into the room.
In factories, it is important to keep the concentration of harmful substances ingested by workers low when working with organic solvents and chemical substances. Prevention standards are stipulated by the Industrial Safety and Health Law.

The air supply and exhaust system in a typical living room has an outside air outlet and an exhaust air inlet installed in the ceiling, and fresh air is blown downward from the ceiling, taken in by the human body, etc. It is sucked into the exhaust port and discharged to the outside through a duct and an exhaust fan.

Japanese Patent Laid-Open No. 56-100240

FIG. 15 shows the arrangement of the air outlet and the air inlet installed on a general ceiling surface. It is the mainstream method in the ventilation method in the living room.

However, there are risks from the perspective of preventing the spread of infection. In terms of airflow methods for air conditioning and ventilation, this method is a “turbulent flow method,” in which fresh air blows from the ceiling to the bottom and air rises in the direction of the ceiling-mounted intake to discharge polluted air. The air currents were turbulent due to collisions. For this reason, the exhaled breath will diffuse in the space until it reaches the suction port on the ceiling, and there is a high risk of being inhaled by people who are irregularly active. Simple partitions such as acrylic plates are used for simple partitions, but the final destination must go toward the ceiling, so as a result, it leads to diffusion in the space, resulting in a complete space. It was a situation that did not lead to risk improvement.

Equipment and design are separated from the industry itself, so it is difficult to harmonize the design, and it is difficult to install ready-made suction equipment on counters and tables, making it difficult to appeal local exhaust ventilation.

In order to prevent infection in spaces such as restaurants, each seat has a dedicated suction port for each person. A local ventilation system for a store characterized by forced suction at a place located in front of a seated person.

The basic power and duct configuration that form this local exhaust system will now be described.
FIG. 1 is a schematic ventilation flow diagram showing a local ventilation system for a store.
Regarding the intake of fresh air, fresh air is introduced from an outside air intake 1 for ventilation installed on the outer wall through a ventilation device 4 consisting of a total heat exchanger or a blower/exhaust fan, and from an outside air intake 2 for ventilation installed on the outer wall. Fresh air is introduced into the room from above through an outside air duct 5 through an indoor air supply port 7 installed on the ceiling surface. Regarding the introduction of outside air, it is a structure that blows from the ceiling.
Regarding the exhaust, the exhaust ducts 6 locally collected from each counter side and the locally collected exhaust ducts 6 from each table side are merged and passed through a ventilation device 4 consisting of a total heat exchanger or a blower and an exhaust vent for ventilation. 3 is discharged to the outside.

The exhaust structure inside the counter takes in air from a slit-shaped counter suction port 12 shown in FIG. It is desirable to set an opening height that facilitates wiping off dust, foreign matter, and the like. Although exhaled breath exhaled by a person is sucked through the opening, a rising wall 14 inside the counter suction is installed so that foreign matter and solid matter are not sucked into the suction device 15 inside the counter to prevent contamination with foreign matter. Exhaust air is taken into the counter internal suction device 15 by such a complicated flow like a crank, and is connected to the exhaust duct 6 .

The exhaust structure inside the table is a slit-shaped table suction port 25 shown in FIG. A portion that serves as a duct for conveying exhaust air is formed by a simple structure in which the covering U-shaped member and the table local exhaust unit 22 are combined, and the table exhaust unit is formed.
The exhaust air conveyed inside the table exhaust unit 22 is connected to the exhaust duct 6 by a bellows duct 20 connected to a duct connection flange plate 28 installed on the wall surface.

By arranging the above-mentioned intake position in front of the person's seat, it is possible to realize a "laminar flow system" from the "turbulent flow system" of the ceiling intake opening, which is general ventilation, to the ceiling surface outlet and the lower surface intake opening. However, although the general laminar flow system satisfies the requirements as a laminar flow system by arranging the suction port on the bottom surface, if the suction ports placed on the bottom surface are aggregated, the space until it reaches the suction port spread inside. The slit-shaped counter suction port 12 and the slit-shaped table suction port 25 are arranged individually for each seat to provide an ideal arrangement and airflow for preventing diffusion.

The intake air volume is also increased. Instead of the 20m3/h/person indicated by the Building Standards Act (Article 20-2 of the Enforcement Order of the Building Standards Act) used for general ventilation, the Ministry of Health, Labor and Welfare recommends it (ventilation method to improve closed spaces with poor ventilation). ) as a countermeasure against coronavirus, by securing 30m3/h/person, a local ventilation system for stores that can secure ventilation air volume and airflow for more effective infection prevention and can collect locally will be realized.

In the present invention, it is possible to effectively collect particles before they spread into space, thereby reducing the risk of infection.

This ventilation system can make effective use of existing store guest room ventilation equipment (exhaust fan, total heat exchanger).

This ventilation system makes effective use of existing tables.

This ventilation system can provide a ventilation system with improved ventilation efficiency by installing a suction port that secures the recommended ventilation air volume per person for each seat.

This ventilation system airflow is a "laminar flow system", and it is possible to provide a ventilation system that prevents diffusion in the space and has high repair efficiency in the immediate vicinity.

This ventilation system is easy to match with the design of any type of business, and is expected to be effective for stores that emphasize space design and atmosphere.

The local ventilation unit for the table is fixed with hinges, etc., so it can be removed and can be easily restored to its original state when the risk of infection subsides. In that case, it is a ventilation system that can be switched to a wall suction device.

Local ventilation units for tables can also be used for tables at large banquets, etc., and can reduce the risk of large group tables.

Since the table system is used in various industries, it can be deployed in various industries such as office spaces and conference rooms, not limited to the restaurant industry.

The system of blowing upward and sucking downward also has the advantage of improving the heating effect.

By adopting a system of air-conditioning equipment that blows air upward and draws air downward, the effect of the "laminar flow system" is further improved, and the risk reduction effect is enhanced.

Due to the declaration of a state of emergency due to the corona virus, it is expected that the voluntary restraint of eating and drinking will continue for several years. Some restaurants are making capital investments such as increasing ventilation and taking various measures to prevent infection. feel out of proportion. In order to dispel the anxiety of the prolonged economic stagnation of the restaurant industry, we expect that the government will set a certain standard, and that it will be possible to operate depending on the degree of countermeasures taken by the store. It is suggested that the targeted ventilation system contributes.

The risk of infectious diseases is not limited to corona, but the unforeseen risk of colds, influenza, and other new infectious diseases that may occur in the future cannot be denied. For all of them, it is assumed that the basic preventive measures that are currently being taken to avoid the "three Cs" will continue to be necessary in the future. We propose that the ventilation system for the purpose of preventing infection in this store will also contribute to measures for .

It is a ventilation system flow diagram of an example of a restaurant customer seat according to the present invention. FIG. 2 is an elevational view showing the flow of air currents in an example of seating in a restaurant according to the present invention; FIG. 2 is a plan view of an example of seating in a restaurant according to the present invention; It is a side view in the single-sided counter which concerns on this invention. FIG. 3 is a side view of the double-sided counter according to the present invention; It is a front view in the counter which concerns on this invention. It is a table side view (long side) which concerns on this invention. It is a table side view (short side) which concerns on this invention. FIG. 4 is an exploded view of the table local exhaust unit according to the present invention; FIG. 4 is a front view of a duct connection flange plate when the table local exhaust unit according to the present invention is used; It is a front view of a wall-mounted standard suction port used for normal ventilation. FIG. 4 is a plan view of the table when using the table local exhaust unit according to the present invention. It is a side view (long side) of the table during normal ventilation. It is a table side view (short side) at the time of normal ventilation. It shows a conventional technique.

Hereinafter, a local ventilation system for a store according to the present invention will be described with reference to the drawings, assuming general restaurant seating as an example of the present invention.

FIG. 1 is a schematic ventilation flow diagram showing a local ventilation system for a store.
Fresh air is introduced into the room from above from an indoor air supply port 7 installed on the ceiling surface through an external air duct 5 through a ventilation device 4 consisting of a total heat exchanger or a blower/exhaust fan from an external air intake port 1 for ventilation installed on the outer wall. The air introduced by a person is discharged as exhaled air and is sucked into a slit-shaped counter suction port 12 or a slit-shaped table suction port 25, and is collected without diffusing to the surroundings if there is no influence of disturbance or the like. The counter-side exhaust and the table-side exhaust are combined by the exhaust duct 6 and discharged to the outside from the ventilation exhaust port 3 installed on the outer wall using the transport power of the ventilator 4 .

FIG. 2 is a diagram showing the flow of air currents showing a local ventilation system for a store.
Fresh air is introduced from above through an indoor air supply port 7 installed on the ceiling surface. The air introduced by a person is exhaled and is sucked into the slit-shaped counter suction port 12 or the slit-shaped table suction port 25 . Compared to the conventional ventilation system shown in FIG. 15, the exhaust air from the human body is efficiently collected without diffusing in the space.

FIG. 3 is a plan view of an example of seating at a restaurant.
The air intakes are arranged one for each seat without being aggregated. By arranging the suction port close to the front side of each person, a laminar flow type air flow is realized, which leads to prevention of diffusion into the space and enables an efficient exhaust system.

4, 5 and 6 are a side view and a front view of the counter, and a detailed description of the structure inside the counter is given below.

Since an exhaust duct 6 connected to a ventilation device 4 consisting of a total heat exchanger or a blower/exhaust fan is lowered from the ceiling surface into the inside of the counter, the duct is covered with a decorative wall 17 for blinding the duct so that the duct is not exposed.

As for the duct space inside the counter, in the case of the single-sided counter shown in FIG.
In the case of the double-sided counter in FIG. 5, the space between both sides of the counter rising wall (audience seat side) 11 is used as the duct space.

The flow of exhaled breath exhaled by a person will be described with reference to FIGS. 4 and 5. FIG.
The counter internal exhaust duct is connected to a counter internal suction device 15 installed for each seat and serves as a port through which the exhaust is sucked. However, if the appliance itself is placed in a conspicuous position, it may be contaminated with dust and other foreign matter, and the design is lacking. A crank-shaped structure is formed in the inside of the counter by installing the counter suction part falling wall 13 from the counter top plate 9, and the effect of enhancing the effect of silencing the suction noise is also obtained. A slit-shaped counter suction port 12 is formed in the front where a person sits by opening a clearance between a counter suction part descending wall 13 and the upper part of the counter table 8 from the counter top plate 9. - 特許庁It is desirable that the slit has a sufficient height for easy cleaning. A local ventilation system for a store is provided, characterized in that this suction opening is provided for each seat.

A slit-shaped counter air intake 12 is installed at one place for each seat, and a plurality of intake air is joined by a duct inside the counter, and an exhaust duct 6 passes through a ventilation device 4 consisting of a total heat exchanger or a blower and exhaust fan for ventilation. It is discharged to the outside through the exhaust port 3 .

4, 5 and 6 in order to prevent the air volume balance of each suction port from being disturbed due to the pressure loss of the duct, etc. due to the length of each duct, the number of bends, etc. An air volume adjustment damper (VD) 16 is installed for each branch to adjust the air volume. The air volume is adjusted to 30 m3/h per person, which is recommended by the Ministry of Health, Labor and Welfare.

The slit-shaped counter suction port 12 shown in FIGS. 4, 5 and 6 is an opening (suction port) for taking in an air volume of 30 m 3 /h adjusted by an air volume adjusting damper (VD) 16 and a person. The intake air velocity is adjusted to about 1 to 2 m/s in order to keep the noise generated by wind noise low. Specifically, the opening degree of the air volume adjustment damper (VD) 16 is adjusted while observing the required air volume and generated noise on site.
The opening area of the slit is calculated by the following formula.
Suction area (m2) = Air volume (m3/h) ÷ 3600 (s) ÷ Suction wind speed (m/s)
The height of the opening ensures easy cleaning.

The suction port shown in FIGS. 4, 5, and 6 is represented by the slit-shaped counter suction port 12, but the shape of the suction port can be freely selected according to the spatial design. In order to prevent foreign matter from entering through the slit opening, the suction shape is free as long as the required suction air volume can be secured, such as installing a net or slit, setting a round shape opening, iron plate with punching holes, etc.

7 and 8 are a side view (longer side) and a side view (shorter side) showing the table portion of the store local ventilation system, and the detailed explanation of local ventilation in the table is given below.

Since an exhaust duct 6 connected to a ventilation device 4 consisting of a total heat exchanger or an air blower is lowered from the ceiling surface to the inside of the counter, the duct is covered with a decoration wall 17 for hiding the duct so that the duct is not exposed.

The exhaust duct 6 descends from the ceiling surface to the lower part of the inner wall surface, is connected to the suction box 32 installed in the wall surface of the decorative wall 17 for blinding the duct, and is connected to the flange plate 28 for duct connection. Attached to the duct connection flange plate 28 . The duct connection flange 29 is a connection port of the wall, but it is desirable to connect with the flexible bellows duct 20 in order to connect with the workable table with the duct. The bellows duct and the duct ventilation space 31 on the table side are connected to carry exhaust air. After that, a space is secured inside the table local exhaust unit internal duct with punching hole 23 to be incorporated in the table local exhaust unit 22, and a slit-shaped table suction port 25 exhausts the exhaust air. Inhale.

Since the table local exhaust unit 22 is manufactured according to the shape of the table to be installed, it is easy to harmonize the design by matching the same texture and color as the table. In addition, it can be easily fixed by using fixing metal fittings such as hinges, and can be easily removed.

By installing an acrylic panel 26 or the like on the table local exhaust unit 22, it is possible to efficiently prevent diffusion of discharged air such as exhaled breath. Increasing the height of the acrylic panel enhances the effect. Any material can be used as long as it has a shielding shape, such as wood, iron plate, and glass.

FIG. 9 is an exploded view of the table local exhaust unit.
Exhaust with a simple structure combining a U-shaped member having a punching hole, a table local exhaust unit internal duct with punched holes 23, a U-shaped member covering it from above, and a table local exhaust unit 22 A portion serving as a duct for conveying is formed, and a table exhaust unit is formed.
A cushion material 33 is attached to the portion where the upper and lower members are engaged to prevent leakage of air and to maintain high airtightness.

The table local exhaust unit 22 has a slit-shaped table suction port 25 arranged at each seat, and the suction portion of the table suction port 25 serves as an opening for sucking exhaled air. The air volume balance of each suction port tends to be disturbed due to duct resistance due to distance. In order to adjust the air volume balance due to the duct resistance, it is normal to install a ready-made damper or the like to adjust the air volume, but it does not fit in the space on the table. Therefore, a duct punching hole 23 inside the table local exhaust unit is installed. The structure has a plurality of punching holes 24 for ventilation. By closing the punching hole 24 with a punching hole closing cap 27 made of rubber or the like, it is possible to easily secure an air volume of 30 m<3>/h per person in a well-balanced manner.

The slit-shaped table suction port 25 is an opening (suction port) for taking in an adjusted air volume of 30 m3/h and a person by closing a plurality of punched holes 24 with a punching hole closing cap 27 made of rubber or the like. As for the suction air velocity, the air velocity on the suction surface of the table suction port 25 is adjusted to about 1 to 2 m/s in order to suppress the noise caused by wind noise.
The opening area of the table suction port 25 is based on the following formula.
Suction area (m2) = Air volume (m3/h) ÷ 3600 (s) ÷ Suction wind speed (m/s)
The height of the opening ensures easy cleaning.

The suction port shown in FIGS. 7, 8, and 9 is represented by the slit-shaped table suction port 25, but the suction shape can be freely selected according to the space design. In order to prevent foreign matter from entering from the slit opening, the shape is free as long as the required suction air volume can be secured, such as installing a net or slit, round opening, iron plate with punching holes, etc.

10 and 11 are members that enable switching between local exhaust and normal operation.
The duct connection flange plate 28 is used when the table local exhaust unit 22 is installed. A duct connection flange 29 incorporated therein is installed to which the bellows duct 20 can be connected to complete the local ventilation system for the store.
In addition, when the risk of infection subsides and the table local exhaust unit 22 is not required, the duct connection flange plate 28 can be removed and replaced with the standard suction port 19 so that it can be used as a space for general ventilation.
With this structure, it is a member that allows easy switching between the local exhaust mode and the normal mode.

In order to provide a structure that can be used by an unspecified number of people, the table local exhaust unit 22 can be easily attached and detached using fixing metal fittings 30 such as hinges.

The ventilation air volume is not 20m3/h per person specified in the Building Standards Act (Article 20-2 of the Enforcement Order of the Building Standards Act), but it is based on the recommendations of the Ministry of Health, Labor and Welfare (ventilation method to improve closed spaces with poor ventilation). As a countermeasure against coronavirus, 30 m3/h/person is recommended, so the ventilation air volume is larger than the legal standard. As a result, the efficiency of air conditioning is poor, which impairs comfort, and energy efficiency deteriorates. Therefore, from the viewpoint of deterioration of comfort and energy conservation, we recommend the "total heat exchanger" method for ventilation equipment.

It has a simple structure and can be easily introduced to any property at a low cost by using existing fans for exhaust equipment and changing the duct route. In the restaurant industry, which is subject to self-restraint, it can be expected to contribute to dispelling the anxiety of users and improving the image of companies.

Since the table system is used in various industries, it can be deployed in various industries such as office spaces and conference rooms, not limited to the restaurant industry.

1. Restaurant building 2 . Outside air intake for ventilation 3 . Ventilation exhaust port 4. 5. Ventilation equipment consisting of a total heat exchanger or a blower/exhaust fan. outside air duct 6 . Exhaust duct 7 . Indoor air supply port 8 . counter table 9 . countertop 10. Counter rising wall (kitchen side)
11. Counter rising wall (audience side)
12. Counter suction port 13 . Counter suction section down wall 14 . counter suction internal riser wall 15 . In-counter suction device 16 . Air volume adjustment damper (VD)
17. Decorative wall for duct blindfolding 18 . Building outer wall 19 . Standard suction port 20 . Bellows duct 21 . Table 22. Table local exhaust unit 23 . 24. With duct punching hole inside local exhaust unit for table. Punching hole 25 . table suction port 26 . acrylic panel 27 . Cap for closing punching hole 28 . Duct connection flange plate 29 . Duct connection flange 30 . Fixing metal fittings such as hinges 31 . Duct ventilation space 32 . suction box 33 . cushion material

Claims (4)

In order to prevent infection in spaces such as restaurants, each seat has a dedicated suction port for each person. is a local ventilation system for stores that forcibly draws air at the place located in front of the seat, and in this local ventilation system for stores, the ventilation equipment 4 consisting of a total heat exchanger and a blower and exhaust fan is used as a power source, and is installed on the outer wall for ventilation Fresh air is introduced from the outside air intake port 2, fresh air is introduced into the room from above through the indoor air supply port 7 installed on the ceiling surface through the outside air duct 5, and the introduction of outside air is equivalent to general ventilation, and is blown out from the ceiling. As for the exhaust, the exhaust ducts locally collected from each counter side and the locally collected exhaust ducts 6 from each table side are merged and passed through the ventilation device 4 to the outdoors from the ventilation exhaust port 3. The exhaust structure of the table, which is discharged and connected to the exhaust duct 6, is connected to a duct connection flange plate 28 installed on the wall surface to form a suction port for each seat, and is connected to the table exhaust unit 22 by the bellows duct 20. A table local exhaust unit internal duct punching hole 23 which is a U-shaped member having a punching hole inside the table exhaust unit and the table local exhaust unit internal duct punching hole 23 are covered from above. The table exhaust unit is formed by forming a part that becomes a duct for conveying the exhaust with a simple structure that combines the table local exhaust unit 22, which is a U-shaped member, and the internal duct for the table local exhaust unit. The table local exhaust unit 22, which is covered from above with a punching hole 23, has a slit-shaped table suction port 25 formed on the front side where a person sits by opening a gap with the table. A local ventilation system for a store, which is provided for each seat. By changing the air intake to the front of the person's seat, the turbulent flow system installed in the ceiling air intake, which is general ventilation, is changed to the laminar flow system with the air outlet on the ceiling and the air intake on the bottom, preventing irregular indoor diffusion. 2. The local ventilation system for stores according to claim 1, wherein counter air inlets 12 and table air inlets 25 are installed individually for each seat to provide an ideal arrangement and airflow for preventing diffusion. In order to increase the intake air volume, instead of the 20m3/h/person used in general ventilation as specified by the Building Standards Act, the Ministry of Health, Labor and Welfare recommends 30m3/h/person as a countermeasure against coronavirus, which is more effective in preventing infection. 2. The local ventilation system for a store according to claim 1, wherein a ventilation system capable of securing ventilation air volume and air flow in the store and collecting air locally is realized. In order to switch the system of the table local exhaust unit 22 used for standard ventilation and for infection control, the standard suction port 19 is removed and replaced with a duct connection flange plate 28, and the table local exhaust unit 22 and 2. A local ventilation system for a store according to claim 1, characterized in that it is a member developed for connecting with a bellows duct 20, and is a member that enables easy switching of the operation method according to the scene.

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