JP2023020253A - Cleaning system - Google Patents

Abstract

To provide a cleaning system which can efficiently discharge air having low cleanliness from an indoor space while reducing running costs by returning air flowing through the indoor space.SOLUTION: A cleaning system is used to keep cleanliness of air in an indoor space and includes: an air supply part 2 which supplies air from the ceiling 11 side of the indoor space 10 to a floor surface; floor suction ports 3 provided on the floor surface of the indoor space; gas-water separation parts each of which is disposed at the outer side of a floor area, where a floor 12 of the indoor space is provided, and separates water and air taken from the floor suction port from each other; an air return path 5 for returning the air separated in the gas-water separation parts to the indoor space; a filter part 6 which cleans air to be sent to the air supply part; and a pressure control unit 512 having a differential pressure damper connected to the floor suction port to control a pressure of the indoor space.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cleaning system for keeping indoor air clean.

As disclosed in Patent Literatures 1 and 2, there are clean rooms such as food factories that require washing of the floor with water. In a clean room where such a large amount of water flows to the floor, multiple drains and gutters are provided on the floor surface, so the exhaust port is generally provided on the wall, but it is necessary to control the flow of air. There is a problem that air with low cleanliness tends to accumulate in the lower part of the room.

On the other hand, as disclosed in Japanese Unexamined Patent Application Publication No. 2002-100000, there is also known a structure capable of taking in not only water but also indoor air from a drain port provided on the floor surface. That is, in the drainage system of Patent Document 1, air and water that flow in from a plurality of drainage ports on the floor flow down to a steam separation tank provided outside the clean room through a single pipe under the floor.

The water stored in the steam-water separation tank is discharged laterally, and exhausted from the top of the steam-water separation tank. In this way, when trying to flow down the water and air flowing from a plurality of drain ports, large-diameter pipes are buried under the floor, and the floor of the building becomes thick (see paragraphs 0003 and 0004 of Patent Document 2). ).

On the other hand, in the exhaust system disclosed in Patent Document 2, about 90% of the indoor air is exhausted from the exhaust port provided on the wall, and the remaining about 10% of the air is sucked and exhausted from the drain port. By doing so, the thickness of the underfloor pipes is about the same as that of conventional drainage pipes.

JP-A-11-293732 JP-A-2004-84993

However, in the clean rooms described in Patent Literatures 1 and 2, the air once flowing inside the room is released as it is as exhaust gas. That is, since the air whose temperature and humidity have been adjusted by the air conditioner is released as it is after one use, the running cost increases.

Also, in a clean room where it is required to maintain a positive pressure inside the room, exhaust is performed by a differential pressure damper installed on the upper part of the wall. Therefore, there is a problem that air with low cleanliness is not exhausted from the room and accumulates.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cleaning system capable of suppressing running costs by returning air that has flowed in a room and efficiently discharging low-clean air from the room. there is

In order to achieve the above object, a cleaning system of the present invention is a cleaning system for maintaining the cleanliness of indoor air, and comprises an air supply supplying air from the ceiling side of the room toward the floor surface. a plurality of floor suction ports provided on the floor surface of the room; and a steam-water separator disposed outside the floor area where the floor of the room is provided to separate water and air taken in from the floor suction ports. a return air path for returning the air separated by the air-water separation part to the room; a filter part for purifying the air sent to the air supply part; and a differential pressure damper connected to the floor suction port.

Here, a suction port connected to the return air path may be provided at a lower portion of the wall of the room. Further, it is preferable that air is separated upward and water is separated downward by the air-water separator.

Further, a box-shaped portion may be arranged at the floor suction port, and a plurality of pipes may be used to connect between the box-shaped portion and the air-water separation portion. Moreover, it is preferable to have a dust stopping part for preventing dust from flowing into the pipe from the box-shaped part. An air volume control valve can be provided in the return air path.

Further, a configuration may be adopted in which part of the air flowing through the return air path is routed through an air conditioner. Moreover, it is preferable that the amount of air taken in from the floor suction port is 20% or more of the amount of air discharged from the room.

In the cleaning system of the present invention configured as described above, water and air taken in from a plurality of floor suction ports provided on the floor surface of the room are separated by the air-water separator arranged outside the floor area. . Then, the air cleaned by the filter section is supplied again into the room through the return air path. Additionally, a differential pressure damper is connected to the at least one floor inlet for controlling the pressure in the chamber.

In this way, the running cost can be suppressed by returning the air that has flowed in the room. In addition, since it is equipped with a differential pressure damper connected to the floor suction port, it is easy to maintain positive pressure in the room. Air with a low temperature can be efficiently discharged from the room.

In addition, by providing an air intake connected to the return air path at the bottom of the room wall, it is not necessary to exhaust all of the room air from the floor air intake, so the diameter of the pipe under the floor becomes thicker and the floor It is possible to prevent the thickness of the film from increasing.

Furthermore, if the air-water separation unit is configured to separate air upward and water downward, the contact time between the air discharged from the room and the waste water can be shortened, and the cleanliness of the returned air can be improved. can be prevented from becoming too low.

Also, if the box-shaped part of the floor suction port and the air-water separation part are connected by a plurality of pipes, it is possible to reduce the flow rate of each pipe, so the diameter of the pipe under the floor can be reduced. It can prevent you from getting fat. And if the diameter of the pipe is small, it can be buried inside the concrete floor.

In addition, by providing a dust stopper to prevent dust from flowing into the pipe from the box-shaped part, the air and water flowing into the floor suction port are quickly separated from dust such as residue, so it is hygienic. Administratively, the desired state can be maintained.

Further, if an air volume adjustment valve is provided in the return air path, the volume of air drawn from the floor air intake or the wall air intake can be adjusted. For example, by adjusting the amount of air drawn into the floor inlet to 20% or more, it becomes possible to easily perform control such as improving the cleanliness of the room. Furthermore, by passing part of the air flowing through the return air path through the air conditioner, the temperature and humidity of the return air can be adjusted to appropriate conditions.

1 is an explanatory diagram illustrating the overall configuration of a cleaning system according to an embodiment; FIG. 1 is a plan view for explaining the configuration of a cleaning system according to an embodiment; FIG. It is a perspective view which fracture|ruptures a part of floor suction port, and demonstrates a structure. It is a figure explaining the structure of a floor suction port and piping, (a) is a top view, (b) is a side view. It is a perspective view explaining the structure of an air-water separation part. It is a perspective view explaining the structure of a pressure control part. It is a top view explaining the situation of a laboratory. Fig. 10 is a diagram for explaining the effect of discharge by the floor suction port, (a) is the result of an experiment when the ratio of wall suction is 0% and the ratio of floor suction is 100%, and (b) is the result when the ratio of wall suction is 20%. This is the result of an experiment in which the rate of floor suction is 80%. Fig. 3 is a diagram for explaining the effect of discharge by the floor suction port, (a) is the result of an experiment in which the ratio of wall suction is 40% and the ratio of floor suction is 60%; This is the result of an experiment in which the rate of floor suction is 40%. Fig. 10 is a diagram for explaining the effect of discharge by the floor suction port, (a) is the result of an experiment in which the wall suction ratio is 80% and the floor suction ratio is 20%, and (b) is the wall suction ratio of 90%. This is the result of an experiment in which the rate of floor suction is 10%. FIG. 3 is a diagram for explaining the cleanliness class (JIS standard) obtained by the clean system of the present embodiment, and is an explanatory diagram of the experimental results in which the ratio of wall suction is 0% and the ratio of floor suction is 100%. be. FIG. 4 is a diagram for explaining the cleanliness class (JIS standard) obtained by the clean system of the present embodiment, and is an explanatory diagram of the experimental results in which the ratio of wall suction is 80% and the ratio of floor suction is 20%. be. FIG. 10 is an explanatory diagram of experimental results in which the ratio of wall suction is 90% and the ratio of floor suction is 10%; FIG. 5 is an explanatory diagram of experimental results when the ratio of wall suction is set to 100% for reference.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram illustrating the overall configuration of the cleaning system of this embodiment. FIG. 2 is a plan view for explaining the configuration of the cleaning system of this embodiment.

The cleaning system of the present embodiment is applied to clean rooms 1 of industries that require drainage facilities for water generated by washing the floor 12 with water, such as food factories, pharmaceutical factories, cosmetics factories, machine processing factories, and painting factories. be done. Food factories include side dish factories, boxed lunch factories, dairy product factories, meat processing factories, marine product processing factories, agricultural product processing factories, canning factories, and beverage processing factories.

In the clean room 1 of these industries, not only is the cleanliness of the air in the room 10 maintained, but also cleaning and drainage by washing with water are performed periodically. It is necessary to install a drainage system.

In addition, from June 2021, all food manufacturers will be required to implement hygiene management based on HACCP (Hazard Analysis Critical Control Point), and the cleanliness, temperature and humidity of the manufacturing area (room 10) Room pressure must be reliably controlled.

The cleaning system of the present embodiment is a system capable of maintaining cleanliness of the air in the room 10 of the clean room 1 and having a drainage function. Furthermore, the system can save energy by supplying the air discharged from the room 10 to the room 10 again by return air (RA).

The cleaning system of the present embodiment includes an air supply unit 2 that supplies air from the ceiling 11 side of the room 10 toward the floor surface of the floor 12, a plurality of floor suction ports 3 provided on the floor surface, and a 2), a return air path 5 for returning the air separated by the air-water separation unit 4 to the room 10, and a filter unit 6 for cleaning the air. be done.

In the clean room 1 , highly clean air (SA: Supply Air) supplied from an air supply section 2 arranged near the ceiling 11 flows toward the floor 12 as a downward flow DA. It is desirable that this air flow (air flow) be a laminar flow (vertical laminar flow) that does not cause air unevenness in the room 10 . The downward flow DA is smoothly discharged from the room 10, so that the clean room 1 can be made to have a low concentration of suspended particles and a high degree of cleanliness.

In the clean room 1 illustrated in FIG. 1 , air sent from an air supply duct 21 serving as an air supply path for clean air to a distribution unit 22 on the side of the room 10 is distributed through a plurality of air outlets distributed on the ceiling 11 . sent to 23.

In FIG. 1, the air outlet 23 is arranged so that air is discharged upward, and the air that bounces off the ceiling 11 passes through the ceiling surface material 111 such as a perforated plate and descends in a simple laminar flow or the like. formed in the stream DA. The configuration of the air supply unit 2 and the ceiling surface material 111 for making the downward flow DA laminar is not limited to this drawing, and various air supply methods can be applied.

The clean room 1 described in this embodiment includes, as exhaust equipment, a plurality of floor suction ports 3 provided on the floor 12 of the room 10 and a suction port 131 provided below the wall 13 of the room 10 . Depending on the amount of circulating air required in the clean room 1, the suction port 131 of the wall 13 may be omitted.

The air discharged from the floor suction port 3 flows into the return air path 5 through the post-separation duct 51 which will be described later. Also, the air discharged from the suction port 131 of the wall 13 flows into the return air path 5 through the wall duct 52 . Here, the amount of air flowing into the post-separation duct 51 and the wall duct 52 (intake air volume) can be adjusted by the air volume control valves 511 and 521 .

The air discharged from the room 10 in this manner is subjected to a process for supplying it to the room 10 again through the return air path 5 . In the cleaning system described in this embodiment, the return air path 5 is branched into two routes.

A first route is formed by a direct return air duct 53 for direct return air. The amount of air flowing into the direct return air duct 53 can be adjusted by an air volume adjustment valve 531 provided near the branch point.

A second route is formed by an air conditioning via duct 54 for passing the air conditioner 8 . The air conditioner 8 is an air conditioner that adjusts the temperature and humidity of air taken in through a filter.

The return air taken into the air conditioner 8 from the air conditioning via duct 54 is adjusted to the set temperature and humidity by the control of the air conditioner 8, and then sent toward the mixing section 63 by the fan of the air conditioner 8. The outside air processor 7 is also connected to the mixing section 63 .

The outside air processor 7 takes in outside air and sends out air filtered by a filter (SOA: Supply Outdoor Air) toward the mixing section 63 through an outside air duct 71 serving as an outside air path by a built-in fan.

In the mixing section 63, the air flowing from the outside air duct 71, the air flowing from the air conditioner 8, and the air flowing from the direct return air duct 53 are mixed and sent to the filter section 6 that cleans the air.

The filter unit 6 is a fan-equipped high-performance filter unit (FFU: Fan Filter Unit) mainly composed of a high-performance filter 61 and a blower fan 62 . The high-performance filter 61 includes a HEPA (High Efficiency Particulate Air) filter, an ULPA (Ultra Low Particulate Air) filter, and the like.

By passing air through a HEPA filter, 99.97% or more of fine particles with a particle size of 0.3 μm can be collected. In addition, the ULPA filter can collect 99.9995% or more of fine particles with a particle size of 0.15 μm. Note that depending on the use of the clean room 1, a medium efficiency filter can also be used.

Next, details of the floor suction port 3 and the air/water separator 4 will be described with reference to FIGS. 2 to 6. FIG. In the clean room 1 illustrated in FIG. 2, six floor suction ports 3 are arranged on the floor 12 forming the floor area of the room 10 .

In this figure, three floor inlets 3 are arranged in a line parallel to the wall 13 at a position closer to the wall 13 than the center of the room 10 . It should be noted that the layout of the floor suction port 3 as described above is merely an example, and can be appropriately designed according to the size and application of the clean room 1 .

Here, FIG. 3 is a diagram for explaining a part of the floor suction port 3. As shown in FIG. The floor suction port 3 is mainly composed of a rectangular parallelepiped box-shaped part 31 and a grating 32 installed on the top opening of the box-shaped part 31 .

A plurality of pipes 33 are connected to side surfaces 312 of the box-shaped portion 31 . FIG. 3 is a perspective view of one pipe 33 broken at a position where it is split in half. The adapter 35 that connects the pipe 33 to the side surface 312 of the box-shaped portion 31 is provided with a dust stop portion 34 that prevents dust from flowing into the pipe 33 from the box-shaped portion 31 .

The dust stopping part 34 is a member that prevents dust such as residue that has flowed into the box-shaped part 31 from flowing into the pipe 33. can be formed. That is, mainly only water and air flow into the pipe 33 by the dust stop portion 34 .

A water gradient is formed on the bottom surface 311 of the box-shaped portion 31, as shown in FIG. 4(a). FIG. 4 illustrates a configuration in which three pipes 33 are connected to the side surface 312 of the single box-shaped portion 31 . For example, a pipe 33 with a diameter of about 100 mm can be used.

The inner bottom surface 311 of the box-shaped portion 31 supported by the support portion 36 is provided with a water gradient so that water can quickly flow toward each pipe 33 . That is, water does not accumulate on the bottom surface 311 of the box-shaped part 31, and the waste water flows into the pipe 33 connected near the bottom surface 311 in a short period of time, which is hygienic.

In addition, the pipe 33 can also form a drainage gradient for flowing water within the range of the height difference that can be secured according to the height of the support part 36, and can quickly flow toward the air-water separation part 4 described later. is drained.

Since three pipes 33 are connected to one box-shaped portion 31 of the present embodiment, the flow rate of each pipe 33 can be reduced. That is, the diameter of the pipe 33 can be made thinner than when one pipe is connected to one box-shaped portion 31 .

The thinner the pipe 33, the smaller the thickness of the floor 12 and the height of the space under the floor. For example, when the pipe 33 is buried inside the concrete floor 12, the thinner the pipe 33, the thinner the floor 12 can be. In addition, the smaller the diameter of the pipe 33, the longer the flowing distance that can be secured according to the height of the support portion 36.

As shown in FIG. 2, in the clean room 1 described in this embodiment, three pipes 33 are connected to all six floor suction ports 3, respectively. This pipe 33 is laid in the floor area where the floor 12 of the room 10 is provided, and outside the floor area, the air-water separation section 4 for separating air and water taken in from the floor suction port 3 is arranged. .

FIG. 5 is a perspective view illustrating an example of the configuration of the air/water separator 4. As shown in FIG. Water and air taken in from the floor suction port 3 flow into the air-water separator 4 through three pipes 33, and the air-water separator 4 separates the air upward and the water downward.

The air-water separation unit 4 described in the present embodiment includes a cylindrical main body 41 to which the ends of the three pipes 33 are connected, a discharge pipe 42 rising from the upper surface of the main body 41, a main body It is mainly composed of a drain pipe 43 hanging from the lower surface of the 41 .

The body part 41 is a cavity in which the openings on both sides of a cylindrical tube turned sideways are closed, and the water and air flowing therein can freely move inside. Since the upper end of the drain pipe 43 is connected to the approximate center of the main body 41, the water that has flowed into the main body 41 is drained through the drain pipe 43 without remaining there.

On the other hand, the air separated from the water rises through the discharge pipe 42 and flows into the post-separation duct 51 connected to the discharge pipe 42 . The amount of air flowing into the duct 51 after separation can be adjusted by the air volume control valve 511 .

As shown in FIG. 2, the air separated by the air-water separator 4 outside the floor 12 of the clean room 1 becomes return air and passes through the post-separation duct 51, which is a part of the return air path, to return air. It flows into the main of line 5. On the other hand, the water separated by the air-water separator 4 is drained through the drain pipe 43 .

On the other hand, as shown in FIGS. 1 and 2 , a pressure control section 512 is provided in the air-water separation section 4 connected to at least one of the plurality of floor suction ports 3 . In FIG. 2, the pressure control unit 512 is connected to two of the six floor suction ports 3 at the center of the room.

FIG. 6 is a perspective view illustrating an example of the configuration of the pressure control section 512 having the differential pressure damper 512a. The lower end of the discharge pipe 42A of the pressure control section 512 is connected to the body section 41 of the air/water separation section 4 similar to that shown in FIG.

A post-separation duct 51 that forms a part of the return air path 5 is connected to the discharge pipe 42A in the middle of the upward extension. Also, the upper portion of the discharge pipe 42A is bent at a right angle and connected to an external connection pipe 512b for discharging air to the outside.

A differential pressure damper 512a is provided in the middle of the external connection pipe 512b. The differential pressure damper 512a is a valve for controlling the pressure in the room 10 of the clean room 1. When the pressure in the room 10 is controlled to be positive, the differential pressure damper 512a exhausts part of the air that has flowed into the discharge pipe 42A to the outside. That is, part of the low-clean air sucked from the floor suction port 3 passes through the differential pressure damper 512a of the pressure control section 512 and is exhausted to the outside.

Also, the air in the room 10 sucked from the suction port 131 of the wall 13 flows into the main pipe of the return air passage 5 through the wall duct 52 which is a part of the return air passage. That is, the air that has passed through the post-separation duct 51 and the air that has passed through the wall duct 52 are sent in a mixed state in the return air path 5 and flow into the direct return air duct 53 and the air conditioning passage duct 54 .

Next, the results of experiments on the effect of the cleaning system of this embodiment will be described with reference to FIGS. 7 to 14. FIG.
The experiment was conducted by installing an aerosol generator in the center of a laboratory modeled on clean room 1 shown in Fig. 7 and measuring the dust emitted from the aerosol generator at 12 measurement points in the room. . Three heaters were installed in the laboratory. The heater was installed to imitate indoor heat generation, and was installed on the assumption that there is a possibility that an upward air current due to heat generation may block a downward air current from the ceiling 11 of the clean room 1 .

The 12 measurement points are indicated by enclosing numbers in squares in FIG. The measurement points are distributed in the center of the room (measurement points 1-3, 8) and around the floor inlet 3 (measurement points 4-7, 9-12). The measurement was carried out by sequentially moving the particle counter placed on the movable carriage from the measurement point 1 . The measurement with the particle counter was performed at each height from the floor to 2500 mm, 1500 mm, and 500 mm at each measurement point, and the average value of the measurement points was calculated from the measured values at each height.

FIGS. 8 to 10 show the measurement results of airborne particle concentrations (particles/m ³ ) measured at measurement points 1-12. The experiment was conducted by changing the ratio of the amount of suction air between the floor suction port 3 provided in the clean room 1 and the suction port 131 of the wall 13 . Other conditions such as the amount of air supplied from the air supply unit 2 to the clean room 1 were the same.

First, FIG. 8(a) shows the results of an experiment in which the ratio of wall suction (the amount of air drawn in from the suction port 131 of the wall 13) is 0% and the ratio of the floor suction (the amount of air drawn in from the floor suction port 3) is 100%. is shown. That is, this is the experimental result when air is not sucked from the suction port 131 of the wall 13 . Looking at the results of this experiment, at all of the 12 measurement points, the airborne particle concentration was below 100,000 (particles/m ³ ) regardless of the size of the dust (particle diameter D (μm)). It was confirmed that a high degree of cleanliness can be maintained by

FIG. 8(b) shows the results of an experiment in which the ratio of wall suction is 20% and the ratio of floor suction is 80%. Looking at the results of this experiment, the concentration of airborne particulates is less than 100,000 (particles/m ³ ) at all measurement points. was confirmed.

Furthermore, Fig. 9(a) shows the experimental results with a wall suction ratio of 40% and a floor suction ratio of 60%, and Fig. 9(b) shows a wall suction ratio of 60% and a floor suction ratio Experimental results with a percentage of 40% are shown. Also, FIG. 10(a) shows the results of an experiment in which the ratio of wall suction is 80% and the ratio of floor suction is 20%. From these experimental results, it can be said that the airborne particle concentration is below 100,000 (particles/m ³ ) at all measurement points, and high cleanliness can be maintained.

On the other hand, FIG. 10(b) shows the results of an experiment in which the ratio of wall suction is 90% and the ratio of floor suction is 10%. Looking at the results of this experiment, the amount of dust with a particle diameter D of 0.3 μm exceeds 100,000 (particles/m ³ ) at measurement point 2, and the ratio of air intake from the suction port 131 of the wall 13 is 90%. It has been found that there is a possibility that the desired degree of cleanliness cannot be maintained in such a case. In other words, the cleanliness of the room 10 can be improved by performing suction from the floor suction port 3 at a rate of a certain amount (for example, 20%) or more.

11 to 14 are diagrams for explaining cleanliness classes obtained when the cleaning system of the present embodiment is applied. Here, the horizontal axis indicates the particle size D (μm) of suspended particles, and the vertical axis indicates the concentration of suspended particles (particles/m ³ ). Circular plots in the figure indicate the measurement results. In addition, the cleanliness classes (class 1 to class 9) based on JIS standards are shown together with a polygonal line.

Here, FIG. 11 shows the experimental results when the ratio of wall suction is 0% and the ratio of floor suction is 100%, and FIG. 12 shows the experimental results when the ratio of wall suction is 80% and the ratio of floor suction is 20%. is shown. On the other hand, FIG. 13 shows the experimental results with a wall suction ratio of 90% and the floor suction ratio of 10%, and FIG. 14 shows the experimental results with a wall suction ratio of 100% and a floor suction ratio of 0%. showing.

Looking at these measurement results, if the rate of floor suction shown in FIGS. It was found that when the ratio of is 10% or less, the cleanliness becomes Class 7 cleanliness class at the particle size D of 0.3 μm. In other words, it can be considered that it is difficult to maintain cleanliness with only return air sucked into the wall in chemical factories, food factories, and machine precision factories where class 6 is required.

In addition, if you try to improve the cleanliness only by wall suction, you will increase the circulation air volume, which will increase the running cost. It becomes possible to secure a stable cleanliness space.

Next, the operation of the cleaning system of this embodiment will be described.
In the cleaning system of the present embodiment configured as described above, water and air taken in from a plurality of floor suction ports 3 provided on the floor surface of the room 10 are separated by 4. Then, the air cleaned by the filter unit 6 through the return air path 5 is supplied to the room 10 again. Furthermore, a differential pressure damper 512a for controlling the pressure in the room 10 is connected to at least one floor suction port 3.

By returning the air that has flowed through the room 10 in this manner, the amount of electricity required for air conditioning can be reduced, and the running cost can be suppressed. Further, since the differential pressure damper 512a connected to the floor suction port 3 is provided, it is possible to easily perform control such as keeping the room 10 at a positive pressure.

Furthermore, by adopting a configuration in which the air in the room 10 is sucked from the floor suction port 3 on the floor surface, as shown in the above-described experimental results, air with low cleanliness is efficiently discharged from the room 10, and the air inside the room 10 is discharged. Cleanliness can be improved. In addition, by sucking air from the floor suction port 3, a high degree of cleanliness can be achieved with a small amount of circulating air.

Further, by providing the suction port 131 connected to the return air path 5 at the lower portion of the wall 13 of the room 10, it is not necessary to exhaust all the air in the room 10 from the floor suction port 3. Depending on the size and use of the clean room 1, the amount of circulating air may increase. It can prevent you from getting bored.

Furthermore, if the air-water separation unit 4 is configured to separate air upward and water downward, the contact time between the air discharged from the room 10 and the waste water can be shortened, and the air to be returned can be shortened. can reduce the risk of contamination by bacteria and the like contained in wastewater.

In the floor suction port 3 of the present embodiment, water quickly flows into the pipe 33 without accumulating water in the box-shaped portion 31, and in the air-water separation unit 4 connected to the pipe 33, water can be quickly discharged without accumulating. It is even more hygienic because the water is drained.

Further, if the box-shaped portion 31 of the floor suction port 3 and the air-water separation portion 4 are connected by a plurality of pipes 33, the flow rate of each pipe 33 can be reduced. It is possible to prevent the diameter of the pipe 33 from increasing.

For example, when the pipe 33 is buried in the floor 12 constructed by placing concrete, the thickness of the floor 12 is affected by the diameter of the pipe 33 . The thickness of the floor 12 can be reduced if the diameter of the pipe 33 is within the range of the structurally required thickness of the floor 12, including the drainage gradient, and this is economical. Also, when the pipe 33 is arranged in the underfloor space, the smaller the diameter of the pipe 33, the wider the space in the room 10 becomes.

Furthermore, by providing the dust stop portion 34 that prevents dust from flowing into the pipe 33 from the box-shaped portion 31, the air and water flowing into the floor suction port 3 are quickly separated from dust such as residue. Therefore, it is possible to maintain a desirable state in terms of hygiene management. Moreover, the residue blocked by the dust stopper 34 can be easily removed by removing the grating 32, and maintenance can be easily performed.

Further, if the return air path 5 is provided with air volume control valves 511 , 521 , 531 , the volume of air drawn from the floor air intake 3 and the air intake 131 of the wall 13 can be adjusted. That is, by adjusting the air volume adjustment valve 511 of the post-separation duct 51 and the air volume adjustment valve 521 of the wall duct 52, the air volume sucked from the floor suction port 3 can be arbitrarily adjusted. Control suitable for the size and use of the clean room 1 can be easily performed. For example, the cleanliness of the room 10 can be improved by adjusting the amount of air drawn in through the floor suction port 3 to 20% or more.

Furthermore, by passing part of the air flowing through the return air path 5 through the air conditioner 8 through the air conditioning route duct 54, it is easy to adjust the temperature and humidity of the air returned to the room 10 to an appropriate state. can be In particular, when the circulating air volume is stable, there is no need to operate the air conditioner 8 to the maximum, and the running cost can be reduced.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment. Included in the invention.

For example, in the above-described embodiment, the case where the air volume adjustment valves 511 and 521 are provided in both the post-separation duct 51 and the wall duct 52 connected to the floor suction port 3 has been described. Only one of them may be provided with an air volume control valve. Alternatively, the air volume adjustment valves 511 may be provided only in some of the post-separation ducts 51 that communicate with the plurality of floor suction ports 3 .

Further, in the above-described embodiment, the case of draining water through the floor suction port 3 has been described. can.

Furthermore, the number of pipes 33 per one floor suction port 3 and the configuration of the air-water separator 4 described in the above embodiment are merely examples, and are not limited to these. may be configured to connect a number of pipes other than three.

1 : Clean room 10 : Indoor 11 : Ceiling 12 : Floor 13 : Wall 131 : Suction port 2 : Air supply section 3 : Floor suction port 31 : Box-shaped section 33 : Piping 34 : Dust trap section 4 : Air-water separation section 42, 42A: discharge pipe 43: drainage pipe 5: return air path 511: air volume adjustment valve 512a: differential pressure damper 521: air volume adjustment valve 6: filter unit

Claims (8)

A cleaning system for keeping indoor air clean,
an air supply unit that supplies air from the ceiling side of the room toward the floor;
a plurality of floor suction ports provided on the floor surface of the room;
a steam-water separation unit arranged outside a floor area in which the floor of the room is provided and separating air and water taken in from the floor suction port;
a return air path for returning the air separated by the air-water separator into the room;
a filter unit that purifies the air sent to the air supply unit;
and a differential pressure damper connected to the floor inlet for controlling the pressure in the chamber. 2. A cleaning system according to claim 1, wherein a suction port connected to said return air path is provided at a lower portion of said room wall. 3. The cleaning system according to claim 1, wherein the air is separated upward and water is separated downward by the air-water separator. 4. The floor suction port is provided with a box-shaped portion, and the box-shaped portion and the steam separator are connected by a plurality of pipes. A cleaning system according to item 1. 5. A cleaning system according to claim 4, further comprising a dust stopper for preventing dust from flowing into said pipe from said box-like portion. 6. The cleaning system according to any one of claims 1 to 5, wherein the return air path is provided with an air volume control valve. 7. A cleaning system according to any one of claims 1 to 6, wherein part of the air flowing through said return air path is routed through an air conditioner. 8. A cleaning system according to any one of claims 1 to 7, wherein the amount of air taken in from said floor suction port is 20% or more of the amount of air discharged from said room.

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