JP6967704B2 - Spray system - Google Patents

Description

The present invention relates to a method of sterilizing the inside of a mist pipe installed in a spray system that sprays mist to cool an outdoor space.

When the summer temperature is high, the temperature near the road surface may become very high due to the reflection from the road surface. In this case, the sensible temperature of the passerby rises, and the discomfort of the passerby increases.

In order to reduce such discomfort, a technique relating to a cooling device including at least one spray nozzle for spraying water in the form of a mist and a ventilation hole for blowing an air flow toward the mist sprayed from the spray nozzle is disclosed. ing.

Further, in such a cooling device, the environment formed by the airflow space surrounding the mist sprayed from the spray nozzle can be efficiently cooled by utilizing the cooling action by the heat of vaporization of the mist. There is one using a two-fluid spray nozzle capable of spraying fine particles. FIG. 3 illustrates a conventional spraying system. As shown in FIG. 3, in the conventional spray system, a valve 21 for switching flow / shutoff to the first compressed air supply path 11 by electrically opening / closing is provided, and compression from the compressor 2 to the two-fluid spray nozzle 4 is provided. Switching between air flow and shutoff. Further, a valve 22 for switching between flow and shutoff to the pressurized water supply path 12 by electrically opening and closing is provided, and the flow and shutoff of the pressurized water from the water pump 3 to the two-fluid spray nozzle 4 are switched. Then, the two-fluid spray nozzle 4 sprays a mist that is a mixture of the supplied compressed air and pressurized water.

However, in the conventional spray system using a two-fluid spray nozzle, when not used for a long period of time, various germs such as Legionella bacteria propagate in the residual water in the pressurized water supply path and are ejected from the spray nozzle at the start of mist operation. , May be unsanitary. Therefore, Patent Document 1 includes a heat exchanger for mist for heat sterilizing the water supplied to the spray nozzle with hot water from a heat source machine.

Japanese Patent No. 4829774

However, the prior art described in Patent Document 1 aims to sterilize only the sprayed water by using a heat exchanger for mist, and the temperature region inside the pipe of the water supply path is not sufficient for heat sterilization. There is a risk that the sprayed water will be contaminated by the biofilm or the like generated at that location.

The present invention solves the above-mentioned conventional problems, and by circulating high-temperature water in a temperature range sufficient for sterilization inside a water pipe for a predetermined time or longer, the water sprayed from a two-fluid spray nozzle and the pressurized water supply path are used. It is an object of the present invention to provide a spraying system capable of heat-sterilizing both of the above and preventing unsanitary water from being sprayed from a two-fluid spray nozzle.

In order to solve the above-mentioned conventional problems, in the spray system of the present invention, in a spray system using a two-fluid nozzle that mixes compressed air and pressurized water and sprays mist, compressed air is circulated to the two-fluid spray nozzle. A compressed air supply path, an air shutoff valve provided on the compressed air supply path that switches between the flow and shutoff of compressed air by electrical opening and closing, a pressurized water supply path that allows pressurized water to flow to a two-fluid spray nozzle, and a pressurized water supply path. A hot water circulation path that connects the water shutoff valve that switches between the flow and shutoff of compressed air by electrically opening and closing, and the water supply path on the upstream side of the water shutoff valve on the pressurized water supply path and the upstream side of the water pump. A hot water circulation valve that is installed on the hot water circulation path and switches the flow and shutoff of water to the hot water circulation path by electrically opening and closing, and a hot water circulation valve that is installed on the hot water circulation path and water from the water supply path to the hot water circulation path. A check valve that blocks flow, a pressure reducing valve that holds the differential pressure between the suction pressure and discharge pressure of the water pump, and high-temperature compressed air that is installed on the compressed air supply path and the pressurized water supply path and compressed by a compressor. Is equipped with a heat exchanger that cools with compressed water. When spraying mist, the water shutoff valve is open, the hot water circulation valve is closed, and mist is sprayed from a two-fluid spray nozzle. With the hot water circulation valve open, the exhaust heat of the high-temperature compressed air on the air path side is received by the pressurized water through the heat exchanger and circulated inside the water pipe.

As a result, when various germs such as Legionella bacteria propagate in the residual water in the pressurized water supply path, high-temperature water in a temperature range sufficient for sterilization is circulated inside the water pipe for a predetermined time or longer to supply the residual water and pressurized water. Heat sterilize the inside of the route.

According to the spray system of the present invention, when the spray system is not used for a long period of time and various bacteria such as Regionella bacteria propagate in the residual water in the pressurized water supply path, high temperature water in a temperature range sufficient for sterilization is supplied to the water pipe. Since it circulates inside for a predetermined time or longer, both the water sprayed from the two-fluid spray nozzle and the pressurized water supply path can be sterilized by heating to prevent unsanitary water from being sprayed from the two-fluid spray nozzle.

The figure which shows the structure of the spray system which concerns on Embodiment 1. The figure which shows the structure of the spray system which concerns on Embodiment 2. The figure which shows the structure of the conventional spraying system.

The first invention is in a spray system using a two-fluid nozzle that mixes compressed air and pressurized water and sprays mist, on a compressed air supply path for circulating compressed air to the two-fluid spray nozzle and on a compressed air supply path. It is provided on an air shutoff valve that switches between the flow and shutoff of compressed air by electrically opening and closing, a pressurized water supply path that allows pressurized water to flow to a two-fluid spray nozzle, and a pressurized water supply path that is provided on the pressurized water supply path. A water shutoff valve that switches between flow and shutoff, a hot water circulation path that connects the upstream side of the water shutoff valve on the pressurized water supply path, and a water supply path on the upstream side of the water pump, and an electrical that is provided on the hot water circulation path. A hot water circulation valve that switches the flow and shutoff of water to the hot water circulation path by opening and closing, a check valve that is installed on the hot water circulation path and blocks the flow of water from the water supply path to the hot water circulation path, and a water pump. It is equipped with a pressure reducing valve that holds the differential pressure between the suction pressure and the discharge pressure, and a heat exchanger that is provided on the compressed air supply path and the pressurized water supply path and cools the high-temperature compressed air compressed by the compressor with the pressurized water. When spraying mist, the water shutoff valve is open and the hot water circulation valve is closed, and mist is sprayed from the two-fluid spray nozzle. During heat sterilization, the water shutoff valve is closed and the hot water circulation valve is open. The exhaust heat of the high-temperature compressed air on the air path side is received by the pressurized water through a heat exchanger and circulated inside the water pipe.

According to this configuration, when there is a risk that various germs such as Legionella bacteria are growing in the residual water in the pressurized water supply path, high-temperature water in a temperature range sufficient for sterilization is put inside the water pipe with a simple configuration. Since it circulates for a predetermined time or longer, both the water sprayed from the two-fluid spray nozzle and the pressurized water supply path can be sterilized by heating to prevent unsanitary water from being sprayed from the two-fluid spray nozzle.

A second aspect of the present invention is the first aspect of the present invention, which comprises a temperature sensor for monitoring the water temperature in the pressurized water path and a control mechanism for stopping the compressor when the water temperature reaches a predetermined temperature or higher.

According to this configuration, the temperature of the high-temperature compressed air compressed by the compressor is abnormally high, and the water temperature in the pressurized water path during heat sterilization becomes a boiling point or a temperature that leads to damage to equipment such as a solenoid valve. However, by stopping the compressor, the water temperature does not rise above a predetermined temperature, and heat sterilization can be safely continued.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment.

(Embodiment 1)
[Configuration of spray system 1A]
FIG. 1 is a diagram showing a configuration of a spray system according to the first embodiment.

As shown in FIG. 1, a compressor 2 for generating compressed air to be circulated to the two-fluid spray nozzle 4 is provided on the upstream side of the compressed air supply path 11 of the spray system according to the first embodiment of the present invention. Further, the compressed air path 11 is provided with a heat exchanger 5 for cooling the high-temperature compressed air compressed by the compressor 2, and an air shutoff valve 21 for switching the flow and shutoff of the compressed air by electrically opening and closing. .. Unless otherwise specified below, control of each device, for example, control of opening / closing a valve or stopping operation of the compressor 2 is performed by a command of a control means (not shown).

On the other hand, on the upstream side of the pressurized water supply path 12, a water pump 3 for generating pressurized water to be distributed to the two-fluid spray nozzle 4 is provided. Further, the pressurized water supply path 12 is provided with a heat exchanger 5 for cooling the high-temperature compressed air compressed by the compressor 2, and a water shutoff valve 22 for switching the flow and shutoff of the pressurized water by mechanically opening and closing. These devices and the two-fluid spray nozzle 4 are connected to each other via a pressurized water supply path 12.

Further, a hot water circulation path 13 for returning the pressurized water is piped from the pressurized water supply path 12 to the water supply path 14 which is branched on the upstream side of the water shutoff valve 22 and is piped on the upstream side of the water pump 3. On the hot water circulation path 13, a check valve 31 for blocking the flow of water from the water supply path 14 to the hot water circulation path 13 and a pressure reducing valve 32 for holding the differential pressure between the suction pressure and the discharge pressure of the water pump 3 are provided. Has been done.

Here, the heat exchanger 5 is a gas and a liquid capable of raising the temperature of the pressurized water flowing through the pressurized water passage 12 by the heat of the high-temperature compressed air when the high-temperature compressed air is generated by the compressor 2. The temperature of the pressurized water at the time of heat sterilization is determined by the temperature of the high-temperature compressed air and the performance of the heat exchanger 5.

Further, in the spray system according to the embodiment of the present invention, the pressurized water path 12 is formed by circulating high temperature water having a temperature determined by the temperature of the high temperature compressed air and the performance of the heat exchanger 5 inside the pressurized water supply path 12 for a predetermined time or longer. It is configured to heat sterilize the inside of the.

[motion]
Hereinafter, the operation and operation of the spray system 1A according to the first embodiment will be described with reference to FIG.

At the start of operation of the spray system, the air shutoff valve 21 is opened and the compressor 2 is started by sending an electric input signal to the air shutoff valve 21 that switches between the flow and shutoff of compressed air by electrically opening and closing. As a result, high-temperature compressed air is circulated through the heat exchanger 5, the temperature of the heat exchanger 5 rises, and the compressed air is discharged from the two-fluid spray nozzle 4 to the outside of the system.

After the start of operation, the hot water circulation valve 24 is opened and the water pump 3 is started by sending an electric input signal to the hot water circulation valve 24 that switches between the flow and cutoff of water to the hot water circulation path 13 by electrically opening and closing. do. As a result, pressurized water is circulated through the heat exchanger 5, and by taking heat from the heat exchanger 5, the pressurized water path 12 and the hot water circulation path 13 are circulated while gradually raising the water temperature.

After a lapse of a certain period of time from the start of operation, the temperature of the pressurized water rises to a value determined by the temperature of the high-temperature compressed air and the performance of the heat exchanger 5, and the temperature becomes constant. Normally, the temperature of the high-temperature compressed air is around 100 ° C., so that the pressurized water is heated to a temperature of 70 ° C. or higher. By circulating this pressurized water for a predetermined time or longer, the inside of the pipes of the pressurized water path 12 and the hot water circulation path 13 and the pressurized water are sterilized by heating.

When spraying mist, the water shutoff valve 22 that switches between the flow and shutoff of pressurized water by opening and closing electrically is opened, and the hot water circulation valve 24 that switches between the flow and shutoff of water to the hot water circulation path 13 by electrically opening and closing is closed. The water supply path 14 is opened to spray mist, but the pressurized water remaining in the pipe has already been heat-sterilized, so that unsanitary water spraying from the two-fluid spray nozzle 4 can be prevented. ..

(Embodiment 2)
[Configuration of spray system 1B]
FIG. 2 is a diagram showing a configuration of a spray system according to a second embodiment.

The difference between the spray system 1B according to the embodiment of the present invention and the spray system 1A according to the embodiment of the invention is that hot water circulating on the pressurized water supply path 12 or the hot water circulation path 13 is shown in FIG. A temperature sensor 33 for detecting the temperature of the above and a control mechanism 41 for stopping the compressor 2 based on the temperature information from the temperature sensor 33 are provided.

[motion]
Hereinafter, the operation and operation of the spray system 1B according to the second embodiment will be described with reference to FIG.

At the start of operation of the spray system, the air shutoff valve 21 is opened and the compressor 2 is started by sending an electric input signal to the air shutoff valve 21 that switches between the flow and shutoff of compressed air by electrically opening and closing. As a result, high-temperature compressed air is circulated through the heat exchanger 5, the temperature of the heat exchanger 5 rises, and the compressed air is discharged from the two-fluid spray nozzle 4 to the outside of the system.

After the start of operation, the hot water circulation valve 24 is opened and the water pump 3 is started by sending an electric input signal to the hot water circulation valve 24 that switches between the flow and cutoff of water to the hot water circulation path 13 by electrically opening and closing. do. As a result, pressurized water is circulated through the heat exchanger 5, and by taking heat from the heat exchanger 5, the pressurized water path 12 and the hot water circulation path 13 are circulated while gradually raising the water temperature.

The temperature of the pressurized water is raised to a value determined by the temperature of the high-temperature compressed air and the performance of the heat exchanger 5, but when the temperature exceeds the heat-resistant temperature of the equipment provided in the pressurized water path 12 and the hot water circulation path 13. Since the temperature information from the temperature sensor 33 may cause damage to the equipment, the operation of the compressor 2 is stopped before the control mechanism 41 exceeds the heat resistant temperature of the equipment. Normally, the temperature required for heat sterilization of sporeless bacteria and fungi is 50 to 60 ° C. Therefore, it is desirable that the temperature at which the compressor 2 is stopped is 60 ° C. and the heat resistant temperature of the device is 65 ° C. or higher.

When spraying mist, first check the operation stop state of the compressor 2, and if the compressor 2 is stopped, restart the operation and then switch the flow and shutoff of pressurized water by electrical opening and closing. The valve 22 is opened, the hot water circulation valve 24 that switches between the flow and shutoff of water to the hot water circulation path 13 by electrical opening and closing is closed, and the water supply path 14 is opened to spray mist.

The above embodiments are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from its gist or its main features.

The present invention is suitable for in-pipe sterilization of a spray system that uses a two-fluid spray nozzle to eject mist into an outdoor space to cool the outdoor space.

1A, 1B spray system 2 compressor 3 water pump 4 2 fluid spray nozzle 5 heat exchanger 11 compressed air supply route 12 pressurized water supply route 13 hot water circulation route 14 water supply route 21 air shutoff valve 22 water shutoff valve 24 hot water circulation valve 31 reverse Stop valve 32 Pressure reducing valve 33 Temperature sensor 41 Control mechanism

Claims (2)

In a spray system using a two-fluid spray nozzle that mixes compressed air and pressurized water and sprays mist.
A compressed air supply path for circulating compressed air to the two fluid spray nozzles,
An air shutoff valve provided on the compressed air supply path that switches between the flow and shutoff of compressed air by electrically opening and closing.
A pressurized water supply path for circulating pressurized water to the two fluid spray nozzles,
A water shutoff valve provided on the pressurized water supply path that switches between flow and shutoff of pressurized water by electrically opening and closing.
A hot water circulation path connecting the upstream side of the water shutoff valve on the pressurized water supply path and the water supply path on the upstream side of the water pump,
A hot water circulation valve provided on the hot water circulation path that switches between flow and shutoff of water to the hot water circulation path by electrically opening and closing.
A check valve provided on the hot water circulation path to block the flow of water from the water supply path to the hot water circulation path,
A pressure reducing valve provided on the hot water circulation path to maintain the differential pressure between the suction pressure and the discharge pressure of the water pump.
It is provided with a heat exchanger provided on the compressed air supply path and the pressurized water supply path and cooling the high-temperature compressed air compressed by the compressor with the pressurized water.
At the time of mist spraying, the water shutoff valve is opened, the hot water circulation valve is closed, and pressurized water obtained by cooling high-temperature compressed air is sprayed from the two-fluid spray nozzle.
During heat sterilization inside the pipe, the water shutoff valve is closed and the hot water circulation valve is open, and the waste heat of the high-temperature compressed air on the air path side is received by the pressurized water through the heat exchanger to receive the heat in the water pipe. A spray system characterized by circulating inside. The spray system according to claim 1, further comprising a temperature sensor for monitoring the water temperature in the pressurized water path and a control mechanism for stopping the compressor when the water temperature reaches a predetermined temperature or higher. ..

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