JP7440968B1 - Spraying device equipped with a two-fluid nozzle and its spraying method - Google Patents

Abstract

[Problem to be solved] An internal mixing type two-fluid nozzle can be placed in any position, including ceiling-mounted placement, with a piping configuration of main pipes and branch pipes, and dripping during stoppage can be suitably avoided. The present invention provides a spray device equipped with a two-fluid nozzle that can be used. A spraying device includes two-fluid nozzles 1 and 2, a first fluid supply source 10 for supplying a first fluid to the two-fluid nozzles at a first pressure, and two fluids from the first fluid supply source 10. A first fluid main pipe 11 for sending the first fluid to the nozzles 1 and 2, and a first fluid branch pipe 111 that branches from the first fluid main pipe 11 and sends the first fluid to each of the two fluid nozzles. , 112, a second fluid supply source 20 for supplying a second fluid to the two-fluid nozzles 1, 2, and a second fluid supply source 20 for supplying a second fluid to the two-fluid nozzles 1, 2 from the second fluid supply source 20. A main fluid pipe 21 , second fluid branch pipes 211 and 212 that branch from the second fluid main pipe 21 and send the second fluid to the two-fluid nozzles 1 and 2, respectively, and a pipe upstream from the two-fluid nozzles 1 and 2. The second fluid branch pipes 211 and 212 are provided with second fluid branch pipe valves V1 and V2, respectively. [Selection diagram] Figure 1

Description

The present disclosure relates to a spraying device equipped with a two-fluid nozzle and a spraying method thereof, for example, a spraying device equipped with one or more internal mixing two-fluid nozzles and a spraying method thereof.

The internal mixing type two-fluid nozzles of Patent Documents 1 to 3 can spray fine-grained mist with a lower gas-liquid ratio compared to general external mixing type nozzles.
In order to solve the problem of liquid dripping when the two-fluid nozzle stops spraying, the spray device of Patent Document 4 is provided in a liquid flow path connected to a liquid supply source and a gas flow path connected to a gas supply source. A single gas valve that is equipped with multiple two-fluid nozzles and is installed in the gas flow path connected to the gas supply source after closing the liquid valve installed for each two-fluid nozzle when stopping spraying. It is disclosed that liquid dripping can be prevented by closing the container.
In order to solve the problem of dripping when the two-fluid nozzle stops spraying, the two-fluid spraying device of Patent Document 5 uses a first method that prevents compressed air from flowing when the two-fluid nozzle stops spraying. With the valve and the second valve that prevents the flow of pressurized water closed, the supply of pressurized water from the pressurized water supply system and compressed air from the compressed air supply system is stopped, and the pressurized water in the piping of the pressurized water supply system is stopped. It is disclosed that a third valve that can be discharged to the outside is opened and pressurized water in piping of a pressurized water supply system is drawn in using the siphon principle to prevent liquid from dripping from a two-fluid nozzle.

When taking measures against dripping when spraying starts and stops, it is also necessary to install the main water pipe at a lower position than the two-fluid nozzle. Furthermore, it is necessary to install a separate pipe for each two-fluid nozzle, which requires a significant amount of work and effort, and there is also a spray time lag when restarting spraying due to air flowing into the water pipe, and wasted air due to air blowing. Consumption and wasteful drainage of water when spraying is stopped are unavoidable.
Further, for the already installed two-fluid nozzle spray device, no practical and practical means of installing the two-fluid nozzle such as replacing the two-fluid nozzle or hanging it from the indoor ceiling has been devised.

Patent No. 5140712 Patent No. 5261367 Patent No. 5971640 Japanese Patent Application Publication No. 2019-188290 Patent No. 6171040

In Patent Document 4, the air pressure supplied to the two-fluid nozzle is not used as an index to open/close the water pipe valve, and in practical use, the water pressure and air pressure at the time of stop and start of operation are Depending on the conditions, there are problems such as coarse particles being sprayed for a long period of time, so it is not practical.
The purpose of the present disclosure is to solve the above problems, to make it possible to arrange an internal mixing type two-fluid nozzle in any position, including a ceiling-mounted arrangement, in a piping configuration of a main pipe and a branch pipe, and to stop the nozzle. It is an object of the present invention to provide a spray device equipped with a two-fluid nozzle that can suitably avoid dripping during operation, and a spray method thereof.

The spray control device of the present disclosure includes:
When the measured pressure value (PV) measured by the pressure measuring device (40, 41) exceeds the preset first set pressure value (SV1), the second fluid branch pipe valve (V1, V2 ,...) from a closed state to an open state to control sending the second fluid to the two-fluid nozzle;
When the measured pressure value (PV) measured by the pressure measuring device (40, 41) becomes less than the preset second set pressure value (SV2), the second fluid branch pipe valve (V1, V2 ,...) from the open state to the closed state to cut off the sending of the second fluid to the two-fluid nozzle (1, 2,...), and then switch the second fluid from the second fluid branch valve (V1, V2,...) to the two-fluid nozzle (1, 2,...). Spray stop control means (60) for controlling dripping of the second fluid (residual liquid) remaining in the second fluid branch pipes (211, 212, . . . ) on the downstream side;
may be provided.
The spray control method of the present disclosure includes:
When the measured pressure value (PV) measured by the pressure measuring device (40, 41) exceeds the preset first set pressure value (SV1), the second fluid branch pipe valve (V1, V2 ,...) from a closed state to an open state and controls sending the second fluid to the two-fluid nozzle;
When the measured pressure value (PV) measured by the pressure measuring device (40, 41) becomes less than the preset second set pressure value (SV2), the second fluid branch pipe valve (V1, V2 ,...) from the open state to the closed state to cut off the sending of the second fluid to the two-fluid nozzle (1, 2,...), and then switch the second fluid from the second fluid branch valve (V1, V2,...) to the two-fluid nozzle (1, 2,...). a spray stop control step of controlling dripping of the second fluid (residual liquid) remaining in the second fluid branch pipes (211, 212, . . . ) on the downstream side;
May contain.
The spray stop control step includes:
When the second measured pressure value (PV) measured by the pressure measuring device becomes less than the preset second set pressure value (SV2), the three-way valve shuts off the supply of the first fluid. controlling a valve for a second fluid branch pipe of;
The flow of the second fluid from the first flow path to the second flow path of the second fluid branch pipe valve of the three-way valve is closed to block new feeding, and the flow of the first fluid from the third flow path to the second flow path is closed. The flow may release the second fluid remaining in the downstream second fluid branch and the two-fluid nozzle from the second fluid branch valve.
The spray stop control step includes:
When the measured pressure value (PV) measured by the pressure measuring device becomes less than the preset second set pressure value (SV2), the second fluid is released from the relief pipe and the second fluid branch The second fluid in the second fluid branch pipe downstream from the pipe valve (V1, V2,...) and the second fluid in the two-fluid nozzle is transferred to the second fluid on the upstream side due to the backflow phenomenon of the first fluid returning from the tip of the two-fluid nozzle to the inside of the nozzle. The flow may be reversed into the fluid branch and then a two-way or three-way valve for the second fluid branch may be controlled.
The spray stop control step includes:
When the measured pressure value (PV) measured by the pressure measuring device becomes less than the preset second set pressure value (SV2), the second fluid is released from the relief piping and the pilot signal pressure decreases. The first flow path of the three-way valve is closed, the third flow path and the second flow path are opened, and the spray from the two-fluid nozzle is stopped by the reverse pressure, and then the pressure inside the first fluid branch pipe or the operating pressure (pilot branch pipe) is Due to the residual pressure, the residual liquid of the second fluid in the second fluid branch pipe and the two-fluid nozzle downstream of the second fluid branch pipe valve may be discharged.
The spray control program of the present disclosure includes:
A program that executes each step of the above spray control method on one or more processors.
The spray control device of the present disclosure includes:
Consists of information processing equipment,
The above spray control program is stored in internal or external memory.
The information processing device may be configured to read the spray control program stored in the memory and execute it with a processor.
The information processing device may be, for example, a cloud server, an on-premises server, a general-purpose personal computer, or the like.

The spray device (A1, A2, A3, A4, B1, B2, B3, B4, B5, B6, B7, B8) equipped with the internal mixing type two-fluid nozzle of the present disclosure includes:
one or more two-fluid nozzles (1, 2,...);
a first fluid supply source (10) for supplying a first fluid at a first pressure to the two-fluid nozzles (1, 2, . . . );
a first fluid main (11) for delivering a first fluid from the first fluid supply source (10) to the two-fluid nozzles (1, 2, . . . );
a first fluid branch pipe (111, 112, . . . ) branching from the first fluid main pipe (11) to send a first fluid to each of the two-fluid nozzles;
a second fluid supply source (20) for supplying a second fluid at a second pressure to the two-fluid nozzles (1, 2, . . . );
a second fluid main pipe (21) for sending a second fluid from the second fluid supply source (20) to the two-fluid nozzles (1, 2, . . . );
a second fluid branch pipe (211, 212, . . . ) branching from the second fluid main pipe (21) to send a second fluid to each of the two-fluid nozzles (1, 2, . . . ); ,
Second fluid branch pipe valves (V1, V2,...) provided in each of the second fluid branch pipes (211, 212,...) upstream of the two-fluid nozzle (1, 2,...) and,
A pressure measuring device (40, 41) that measures the pressure of the first fluid (for example, the pressure inside the pipe) at any position from the first fluid supply source (10) to the two-fluid nozzle (1, 2, . . . ). )and,
For example, at the start of operation, if the measured pressure value (PV) measured by the pressure measuring device (40, 41) exceeds the preset first set pressure value (SV1), Spray start control means (50 )and,
For example, when the measured pressure value (PV) measured by the pressure measuring device (40, 41) becomes less than the preset second set pressure value (SV2) when the operation is stopped, the second set pressure value (SV2) is set in advance. The two-fluid branch pipe valves (V1, V2, . . . ) are changed from the open state to the closed state to cut off the sending of the second fluid to the two-fluid nozzles (1, 2, . . . ), and the second fluid Spray stop control means for controlling dripping of the second fluid (residual liquid) remaining in the second fluid branch pipes (211, 212, . . .) downstream from the branch pipe valves (V1, V2, . . . ); (60) and
may be provided.

The first pressure is, for example, from 300 kPa to 600 kPa.
The second pressure is a pressure lower than the first pressure, for example, from 250 kPa to 550 kPa.
The first fluid supply source (10) and the second fluid supply source (20) may include a regulator (R) that keeps the pressure on the secondary side constant.
The pressure measuring devices (40, 41) may be, for example, gas pressure sensors.
The operation may be started, for example, after the first fluid is sent from the first fluid supply source (10) to the first fluid main pipe (11). The supply valve of the first fluid supply source (10) may be opened, or a gate valve provided in the first fluid main pipe may be opened.
The operation may be shut down, for example, after stopping sending the first fluid from the first fluid supply source (10) to the first fluid main pipe (11). The supply valve of the first fluid supply source (10) may be closed, or the gate valve provided in the first fluid main pipe may be closed.
The first set pressure value (SV1) may be set, for example, to a value lower than the first pressure by, for example, 5 to 50 kPa.
The second set pressure value (SV2) may be set, for example, to a value lower than the first pressure by, for example, 5 to 50 kPa.
The first set pressure value (SV1) and the second set pressure value (SV2) may be the same or different.
The spray start control means (50) and the spray stop control means (60) may be configured with the same pressure switch, and may be configured using a dedicated electronic circuit, a controller such as a PLC, a computer (processor, memory, and cooperation of programs stored in the memory). It may also consist of functions such as
The spray stop control means (60) is executed at scheduled operation stop (for example, timer automatic stop, manual stop), emergency stop, stop due to pressure fluctuation (large drop, etc.) of the first fluid or the second fluid, etc. may be done.
By operating the second fluid branch pipe valves (V1, V2, . . . ), the second fluid can be sent to the two-fluid nozzle after the pressure of the first fluid sent to the two-fluid nozzle becomes sufficiently high. This makes it possible to suppress coarse particles at the start of spraying.

The spray device includes:
A first fluid control valve (30) is provided for cutting off the supply of the first fluid at any position from the first fluid supply source (10) to the two-fluid nozzle (1, 2, . . . ). Good too. The first fluid control valve (30) may be provided in the first fluid main pipe (11) or may be provided in each first fluid branch pipe (111, 112, . . . ). The first fluid control valve (30) may be an air-driven valve or an electromagnetically-driven valve.
For example, the first fluid control valve (30) may be opened or closed by an electrical command from a humidification controller (70) that controls humidification (spraying) according to humidity measured by a hygrometer.

The second fluid branch pipe valve and the two-fluid nozzle may be configured as a one-to-one set, and the second fluid branch pipe valve (V1, V2, . . . ) and the two-fluid nozzle may be configured as a one-to-one set. It may be composed of a set of two or more pairs.
The second fluid branch pipe valves (V1, V2, . . . ) may be, for example, two-way valves or three-way valves.

The second fluid branch pipe valves (V1, V2, . . . ) may be, for example, air-driven valves or electromagnetically-driven valves.
When the second fluid branch pipe valves (V1, V2, . . . ) are air-driven valves, pilot branch pipes (1131, 1132) branch from a pilot pipe (113) branching from the first fluid main pipe (11). ,...) to the second fluid branch pipe valves (V1, V2,...) as a pilot signal pressure.
When the second fluid branch pipe valves (V1, V2, . . . ) are air-driven valves, the second fluid branch pipes (1141, 1142, . . . ) branching from the first fluid main pipe (11) are The first fluid may be configured to be sent as a pilot signal pressure to the fluid branch pipe valves (V1, V2, . . . ).
The pressure measuring device (40, 41) is connected to the first fluid main pipe (11), the pilot pipe (113), the pilot branch pipe (1131, 1132,...), the pilot branch pipe (1141, 1142,...) Of these, one or more may be provided at any point.
The pilot pipe (113) may be provided with a pilot signal pressure control valve (45), and each of the pilot branch pipes (1131, 1132, . . . ) may be provided with a pilot signal pressure control valve. Good too. A pilot signal pressure control valve may be provided in each of the pilot branch pipes (1141, 1142, . . . ). The pilot signal pressure control valve (45) may be an air-driven valve or an electromagnetically-driven valve.

The pressure measuring device (40) may include a pressure switch that is turned on when the measured pressure value is equal to or higher than a set value and turned off when the measured pressure value is less than the set value. The pressure switch may be configured as a spray start control means (50) and a spray stop control means (60).
One side of the pressure switch is connected to the power supply, and the other side of the pressure switch is electrically connected to the pilot signal pressure control valve (45), and when the measured pressure value is equal to or higher than the set value, the switch is turned on and an electric signal is sent. The pilot signal pressure control valve (45) is in the ON state (the first flow path V01 and the second flow path V02 are open), and when the measured pressure value is less than the set value, the switch is turned OFF, and an electric signal is sent to control the pilot signal pressure. The valve (45) is in the OFF state (the second flow path V02 and the third flow path V03 are opened).
The pressure measuring device (41) may include a pressure switch that is turned on when the measured pressure value is equal to or higher than a set value and turned off when the measured pressure value is less than the set value. One side of the switch is connected to the power supply, and the other side of the switch is electrically connected to the relief gate valve (262), and when the measured pressure value is equal to or higher than the set value, the switch is turned on, an electric signal is sent, and the relief gate valve (262) is turned on. 262) is closed, and when the measured pressure value is less than the set value, the switch is turned off and an electrical signal is sent to open the relief gate valve (262).
The pressure measuring device (41) may include a pressure switch that is turned on when the measured pressure value is equal to or higher than a set value and turned off when the measured pressure value is less than the set value. One side of the switch is connected to the power supply, and the other side of the switch is electrically connected to the second fluid branch pipe valve (V1, V2,...), and when the measured pressure value exceeds the set value, the switch is turned on and an electric signal is output. The valves for the second fluid branch pipes (V1, V2, etc.) open, and when the measured pressure value is less than the set value, the switch turns OFF. ,...) closes.

The spray start control means (50) includes:
When the measured pressure value (PV) measured by the pressure measuring device (40) exceeds a preset first set pressure value (SV1), the pilot signal pressure control valve (45) is opened. (ON state), the first fluid (gas) as a pilot signal pressure may be sent to control the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve.
The spray start control means (50) includes:
The supply of the first fluid is started by means for starting the supply of the first fluid (opening of the first fluid supply source (10) and the first fluid control valve (30)), and the pressure measuring device (40) When the measured pressure value (PV) measured at is equal to or higher than the preset first set pressure value (SV1), the pilot signal pressure control valve (45) is opened (ON state) and the pilot signal is The first fluid (gas) as pressure may be sent in to control the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve.
In this configuration, by feeding the first fluid (gas), the pilot signal pressure changes from OFF to ON state almost immediately when it exceeds the ON/OFF switching setting value, and the second fluid branch pipe valves (V1, V2,...) , the second fluid (liquid) flows from the first flow path (upper valve V11 in FIG. 1) to the second flow path (lower valve V12 in FIG. 1), and is internally mixed with the first fluid (gas) in the two-fluid nozzle. , fine particles are injected.

The spray stop control means (60)
When the second measured pressure value (PV) measured by the pressure measuring device (40) becomes less than the preset second set pressure value (SV2), the pilot signal pressure control valve (45) by closing the first fluid (gas) as the pilot signal pressure, and opening the pilot pressure of the three-way valve of the pilot signal pressure control valve (45) to atmospheric pressure, the second fluid of the three-way valve Branch pipe valves (V1, V2, . . . ) may also be controlled.
In this configuration, the first fluid (gas) is no longer fed, the pilot signal pressure changes from ON to OFF, and the first flow path (V11, V21) of the second fluid branch pipe valve (V1, V2, ...) of the three-way valve Close the flow of the second fluid (liquid) from the to the second flow path (V12, V22) to cut off new feeding, and from the third flow path (V13, V23) to the second flow path (V12, V22) Due to the flow of the first fluid (residual pressure in the first fluid main pipe (11)), the second fluid branch pipes (211, 212, . . . ) downstream from the second fluid branch pipe valves (V1, V2, . . .) The second fluid (residual liquid) remaining in the two-fluid nozzle can be discharged (blown away), and the spraying of coarse particles can also be suppressed. When the operation is resumed, there is no liquid pool and the second liquid has reached the second fluid branch pipe valves (V1, V2, . . . ), so the operation can be resumed quickly. Note that the flow of the first fluid (air) from the first flow path (V01) to the second flow path (V02) of the pilot signal pressure control valve (45) is closed, and the flow of the first fluid (air) from the first flow path (V01) to the second flow path (V02) is closed. Open road (V03) and lower the pilot signal pressure to atmospheric pressure.

The spray device includes:
a relief pipe (26) for discharging the second fluid branched from the second fluid main pipe (21) and sent to the two-fluid nozzle (1, 2, . . . );
A relief control unit (260) may be provided to provide relief of the second fluid discharged from the relief pipe (26). By controlling the relief control unit (260), the second fluid is released from the relief pipe (26), and the pressure of the second fluid sent to the two-fluid nozzle (1, 2,...) is relatively adjusted. descend.
The relief control section (260) includes a relief valve (261) that opens at a relief set pressure and adjusts the pressure on the primary side, and a relief gate valve (262) provided downstream of the relief valve (261). Good too. The relief setting pressure of the relief valve (261) is lower than the supply pressure (second pressure) of the second fluid supply source (20). In addition, the relief set pressure must be a pressure value that satisfies the condition where the reverse phenomenon occurs in the two-fluid nozzle when spraying is stopped, which will be described later. It may be lower than the OFF switching setting value (eg, 150 to 200 kPa), and may be, for example, 80 kPa to 120 kPa.
The spray start control means (50) includes:
The supply of the first fluid is started by means for starting the supply of the first fluid (opening of the first fluid supply source (10) and the first fluid control valve (30)), and the pressure measuring device (41) The relief gate valve (262) may be controlled to be closed when the measured pressure value (PV) exceeds a preset first set pressure value (SV1).
The spray stop control means (60) includes:
When the measured pressure value (PV) measured by the pressure measuring device (41) becomes less than the preset second set pressure value (SV2), the gate valve (262) is opened and the second fluid is released from the relief pipe (26), and the second fluid branch pipes (211, 212, . . . ) downstream from the second fluid branch pipe valves (V1, V2, . . . ) and the second fluid branch pipe in the second fluid nozzle are released from the relief pipe (26). Due to the backflow phenomenon of the first fluid returning from the tip of the two-fluid nozzle to the inside of the nozzle (piping for the second fluid), the second fluid is The fluid may flow backward into the branch pipes (211, 212, . . . ), and then the second fluid branch pipe valves (V1, V2, . . . ), which are two-way valves or three-way valves, may be controlled.
The reverse phenomenon is a phenomenon that occurs when the pressure of the first fluid (for example, the residual pressure of 250 kPa or more to 400 kPa) is higher than the pressure of the second fluid (for example, the relief setting pressure of 80 kPa to 120 kPa).

The relief control unit (260) may include a pressure gauge and a pressure control valve that is provided downstream from the pressure gauge and controls the valve opening so that the measured value of the pressure gauge becomes the relief set pressure.
During spraying, the pressure control valve is not driven and the second fluid is not released from the relief pipe (26). When the spraying is stopped, the pressure control valve starts driving, the valve opening is controlled so that the measured value of the pressure gauge (primary side pressure) becomes the relief set pressure, and the second fluid is released.
The spray stop control means (60) includes:
Control is performed to start driving the pressure control valve when the measured pressure value (PV) measured by the pressure measuring device (41) becomes less than a preset second set pressure value (SV2). You may.

When the second fluid branch pipe valves (V1, V2, . . . ) are three-way valves, the pilot signal is ON and the pilot signal is ON to cause the flow to flow backwards. ), and after the reverse flow is completed, the pilot signal is turned OFF, and the first fluid flows from the third flow path (V13, V23) to the second flow path (V12, V22).
When the second fluid branch pipe valves (V1, V2,...) are two-way valves, when making the reverse flow, the pilot signal is ON and the first fluid flows from the second flow path (secondary side downstream of the valve). The first fluid flows into the channel (primary side upstream from the valve), and after the reverse flow is completed, the pilot signal is turned OFF.

The spray device includes:
The second fluid main pipe (21) may be provided with a second fluid main pipe control valve (25) upstream of the relief pipe (26). The second fluid main control valve (25) may be an air-driven valve or an electromagnetically-driven valve. The spray stop control means (60), when the measured pressure value (PV) measured by the pressure measuring device (40, 41) becomes less than a second preset pressure value (SV2), The second fluid main control valve (25) may be controlled to close.
The spray device includes:
A storage tank (80) connected to the relief pipe (26) and for storing the second fluid may be provided.
The storage tank (80) may include a liquid level meter (81), and may be configured to be replenished with the second fluid from a second fluid replenishment pipe (84) when the liquid level falls below a predetermined level.
The storage tank (80) includes a pump (P) for pumping the second fluid, and may be used as the second fluid supply source (20) or for replenishing the second fluid supply source (20).

The spray device includes:
A check valve (check valve) may be provided in the first flow path (primary side) of the second fluid branch pipe valve (V1, V2, . . . ).
The spray stop control means (60) controls the relief control section (260) when the measured pressure value (PV) measured by the pressure measuring device becomes less than a second preset pressure value (SV2). ) may be controlled to release the second fluid from the relief pipe (26). As a result, the first flow path of the three-way valve is closed due to the pilot signal pressure drop, the third flow path and the second flow path are opened, and the spray from the two-fluid nozzle is stopped due to the reverse pressure. Due to the residual pressure of the operating pressure (pilot branch pipe), the residual liquid of the second fluid in the second fluid branch pipe and the two-fluid nozzle downstream of the second fluid branch pipe valve (V1, V2,...) is released. Good too.

The spraying method of the spraying device equipped with the internal mixing type two-fluid nozzle of the present disclosure includes:
The spray device includes:
one or more two-fluid nozzles (1, 2,...);
a first fluid supply source (10) for supplying a first fluid at a first pressure to the two-fluid nozzles (1, 2, . . . );
a first fluid main (11) for delivering a first fluid from the first fluid supply source (10) to the two-fluid nozzles (1, 2, . . . );
a first fluid branch pipe (111, 112, . . . ) branching from the first fluid main pipe (11) to send a first fluid to each of the two-fluid nozzles;
a second fluid supply source (20) for supplying a second fluid at a second pressure to the two-fluid nozzles (1, 2, . . . );
a second fluid main pipe (21) for sending a second fluid from the second fluid supply source (20) to the two-fluid nozzles (1, 2, . . . );
a second fluid branch pipe (211, 212, . . . ) branching from the second fluid main pipe (21) to send a second fluid to each of the two-fluid nozzles (1, 2, . . . ); ,
Second fluid branch pipe valves (V1, V2,...) provided in each of the second fluid branch pipes (211, 212,...) upstream of the two-fluid nozzle (1, 2,...) and,
a pressure measuring device (40) that measures the pressure of the first fluid (for example, the pressure inside the pipe) at any position from the first fluid supply source (10) to the two-fluid nozzle (1, 2, . . . ); , comprising;
The spraying method is
When the measured pressure value (PV) measured by the pressure measuring device (40) exceeds a preset first set pressure value (SV1), the second fluid branch pipe valves (V1, V2 ,...) from a closed state to an open state, and controlling to send the second fluid to the two-fluid nozzle (1, 2,...);
When the measured pressure value (PV) measured by the pressure measuring device (40) becomes less than the preset second set pressure value (SV2), the second fluid branch pipe valves (V1, V2 ,...) from the open state to the closed state to cut off the sending of the second fluid to the two-fluid nozzles (1, 2,...), and the second fluid branch pipe valves (V1, V2,...) a spray stop control step of controlling dripping of the second fluid (residual liquid) remaining in the second fluid branch pipes (211, 212, . . . ) downstream from ・);
May contain.

The spray stop control step includes:
When the second measured pressure value (PV) measured by the pressure measuring device (40) becomes less than the preset second set pressure value (SV2), the pilot signal pressure control valve (1135) The second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve may be controlled by closing the valve and blocking the supply of the first fluid.

The operation stop control step includes:
The spray device includes a relief pipe (26) for discharging the second fluid that is branched from the second fluid main pipe (21) and sent to the two-fluid nozzle (1, 2, . . . ); a relief control section (260) that controls the release of the second fluid in the piping (26);
When the measured pressure value (PV) measured by the pressure measuring device (40) becomes less than a preset second set pressure value (SV2), the relief control unit (260) is controlled to The two fluids are released from the relief piping (26), and the second fluid branch pipes (211, 212, . . .) downstream from the second fluid branch pipe valves (V1, V2, . . .) and the two fluid nozzles are discharged. The second fluid is transferred to the second fluid branch pipe (211, 212, . . .), and then the second fluid branch valves (V1, V2, . . .) of a two-way valve or a three-way valve may be controlled.

The first fluid supply source (10) may include a compressor for pressurizing the first fluid (compressed air) to a supply pressure.
The internal mixing type two-fluid nozzle includes a gas-liquid injection section at the tip of the nozzle, and at least one gas injection section and at least one liquid injection section provided within the gas-liquid injection section, and the injection section of the liquid injection section It has a structure in which the gas flow from the gas injection part flows into the inside of the liquid injection part when the pressure is lower than the injection pressure of the gas injection part. The gas-liquid injection section may have a gas-liquid mixing region in which the gas from the gas injection section and the liquid from the liquid injection section collide.
The internal mixing type two-fluid nozzle includes:
It may include at least two gas injection parts that eject the first fluid (compressed air) and one liquid injection part that ejects the second fluid (liquid).
The collision part (gas-liquid mixing region) formed by colliding the first fluid (compressed air) injected from the gas injection part in front of the tip of the liquid injection part or the part containing the collision part is a part inside the nozzle. It is configured to atomize the liquid by colliding with the liquid injected by the liquid injection part.
The internal mixing type two-fluid nozzle is preferably configured with a device disclosed in Japanese Patent No. 5140712, Japanese Patent No. 5261367, and Japanese Patent No. 5971640.

The first fluid is not particularly limited, and examples thereof include air, dry air, clean air, nitrogen, and inert gas, and can be appropriately set depending on the purpose of use.
The second fluid is not particularly limited, and examples thereof include water, ionized water, deodorizing liquid, moisturizing liquid, beauty water, cosmetic liquid such as lotion, and chemical liquid such as sterilizing liquid and disinfecting liquid.

1 is a configuration diagram of a spray device according to a first embodiment; FIG. FIG. 3 is an operation flow diagram at the time of starting and stopping the operation of the first embodiment. FIG. 2 is a diagram for explaining an internal mixing type two-fluid nozzle (cross needle structure). FIG. 2 is a configuration diagram of a spray device according to another example 1 of the first embodiment. FIG. 3 is a configuration diagram of a spray device according to another example 2 of the first embodiment. FIG. 2 is a configuration diagram of a spray device according to a second embodiment. FIG. 7 is an operation flowchart when starting and stopping operation in Embodiment 2. FIG. FIG. 7 is a configuration diagram of a spray device according to another example 1 of the second embodiment. FIG. 7 is a configuration diagram of a spray device according to another example 2 of the second embodiment. FIG. 7 is a configuration diagram of a spray device according to another example 3 of the second embodiment. FIG. 6 is a configuration diagram of a spray device according to another example 4 of the second embodiment. FIG. 7 is a configuration diagram of a spray device according to another example 5 of the second embodiment. FIG. 7 is a configuration diagram of a spray device according to another example 6 of the second embodiment.

Some embodiments of the present invention will be described below. The embodiment described below describes an example of the present invention. The present invention is not limited to the following embodiments, but also includes various modifications that may be implemented within the scope of the invention. "Upstream" and "downstream" are defined based on the direction of fluid flow. The upstream side of the valve is called the primary side, and the downstream side is called the secondary side.

(Embodiment 1)
1 to 3, the configuration and operation flow of the spray device A1 of the first embodiment will be explained.
The spray device A1 includes one or more two-fluid nozzles (1, 2, . . . ) and a first fluid (air) to the two-fluid nozzles (1, 2, . . . ) at a first pressure (for example, 500 kPa). a first fluid supply source 10 for supplying a first fluid, a first fluid main pipe 11 for sending a first fluid (air) from the first fluid supply source 10 to the two fluid nozzles (1, 2, . . . ); A second fluid supply source 20 for supplying a second fluid (water) at a second pressure (for example, 450 kPa) to the fluid nozzles (1, 2, . . . ); 1, 2,...) for sending a second fluid (water) to the second fluid main pipe 21. Although two two-fluid nozzles are shown in FIG. 1, the present invention is not limited to this, and three or more two-fluid nozzles may be provided.

The first fluid branch pipe 111 is a branch pipe for branching from the first fluid main pipe 11 and sending the first fluid (air) to the two-fluid nozzle 1. The first fluid branch pipe 112 is a branch pipe for branching from the first fluid main pipe 11 and sending the first fluid (air) to the two-fluid nozzle 2 . First fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.
The third flow path branch pipe 1111 branches from the first fluid branch pipe 111 connected to the two-fluid nozzle 1 and is connected to the third flow path (right side valve V13) of the second fluid branch pipe valve V1. . The third flow path branch pipe 1121 branches from the first fluid branch pipe 112 connected to the two-fluid nozzle 2 and is connected to the third flow path (right side valve V23) of the second fluid branch pipe valve V2. . Branch piping for the third flow path is also provided in accordance with the number of two-fluid nozzles.

The second fluid branch pipe 211 is a branch pipe for branching from the second fluid main pipe 21 and sending the second fluid (water) to the two-fluid nozzle 1. The second fluid branch pipe 212 is a branch pipe for branching from the second fluid main pipe 21 and sending the second fluid (water) to the two-fluid nozzle 2. Second fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.

The second fluid branch pipe valve V1 is a three-way valve provided in the second fluid branch pipe 211 upstream of the two-fluid nozzle 1. The second fluid branch pipe valve V2 is a three-way valve provided in the second fluid branch pipe 212 upstream of the two-fluid nozzle 2. Valves for second fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.

The first fluid (air) control valve 30 is an electromagnetically driven valve provided in the first fluid main pipe 11. The first fluid (air) control valve 30 is opened and closed in response to electrical commands from a humidification controller 70 that controls humidification (spraying) according to humidity measured by a hygrometer.
The pilot pipe 113 is a branch pipe that branches from the first fluid main pipe 11 downstream of the first fluid (air) control valve 30 and sends the first fluid (air) as a pilot signal pressure to the two-fluid nozzle. . The pilot branch pipe 1131 is a branch pipe that branches from the pilot pipe 113 and sends the first fluid (air) to the two-fluid nozzle 1 as a pilot signal pressure. The pilot branch pipe 1132 is a branch pipe that branches from the pilot pipe 113 and sends the first fluid (air) to the two-fluid nozzle 2 as a pilot signal pressure. Pilot branch piping is also provided in accordance with the number of two-fluid nozzles.

The pressure measuring device 40 is provided in the pilot pipe 113 and measures the pressure (inside pipe pressure) of the first fluid (air).
The pilot signal pressure control valve 45 is provided in the pilot pipe 113 upstream from the position of the pressure measuring device 40. The pilot signal pressure control valve 45 controls feeding of the first fluid (air) flowing into the pilot pipe 113 downstream thereof.
In addition, as another embodiment, the pressure measuring device 40 is not provided in the pilot pipe 113 but in the first fluid main pipe 11 or the first fluid branch pipes 111 and 112 downstream from the first fluid (air) control valve 30. It may be provided in either.

When the second fluid branch pipe valves (V1, V2,...) are three-way valves, when the pilot signal pressure is equal to or higher than the ON/OFF switching setting value (for example, 200 kPa) and the state changes from OFF to ON, the third flow (right side valve V13 in Fig. 1) is closed, the second flow path (lower valves V12, V22 in Fig. 1) is opened from the first flow path (upper valves V11, V21 in Fig. 1), and the second fluid (water ) flows from the first flow path (upper valves V11, V21) to the second flow path (lower valves V12, V22). When the pilot signal pressure is less than the ON/OFF switching setting value and the state changes from ON to OFF, the first flow path (upper valves V11, V21) is closed, and the third flow path (right side valves V13, V23) is switched from the second flow path to the ON/OFF switching setting value. (Lower valves V12, V22) are opened and the first fluid (air) flows.

The spray start control means 50 activates the pilot signal pressure control valve 45 when the measured pressure value (PV) measured by the pressure measuring device 40 exceeds a preset first set pressure value (SV1). It is opened, the first fluid (air) is sent in as a pilot signal pressure, and the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve are controlled. The spray start control means 50 includes, for example, a pressure switch, and controls when the measured pressure value (PV) measured by the pressure measuring device 40 becomes equal to or higher than a preset first set pressure value (SV1). In this case, the switch changes from OFF to ON, and the electromagnetically driven valve of the pilot signal pressure control valve 45 may be driven to open the valve. The electromagnetically driven valve of the pilot signal pressure control valve 45 may be a two-way valve.

The spray stop control means 60 controls the pilot signal pressure control valve 45 when the measured pressure value (PV) measured by the pressure measuring device 40 becomes less than a second preset pressure value (SV2). By closing and blocking the supply of the first fluid (air) as a pilot signal pressure, the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve are controlled. The spray stop control means 60 is configured with, for example, a pressure switch, and is configured to control when the measured pressure value (PV) measured by the pressure measuring device 40 becomes less than a second preset pressure value (SV2). In this case, the switch changes from ON to OFF, and the electromagnetically driven valve of the pilot signal pressure control valve 45 may be driven to close the valve.
The first set pressure value (SV1) and the second set pressure value (SV2) may be the same value, and the spray start control means 50 and the spray stop control means 60 may be configured with the same pressure switch.
Note that the electromagnetically driven valve of the pilot signal pressure control valve 45 may be a two-way valve.

(Operation flow)
The operation flow when starting and stopping spraying will be described with reference to FIG. 2.
(S1) The first fluid (air) control valve 30 and the pilot signal pressure control valve 45 are in a closed state. The second fluid branch pipe valves (V1, V2, . . . ) are in an OFF state (the third flow path and the second flow path are in an open state). Air at a predetermined pressure of 500 kP is supplied from the first fluid (air) supply source 10 to the first fluid main pipe 11, and is shut off by the first fluid (air) control valve 30. Water at a predetermined pressure of 450 kPa is supplied from the second fluid (water) supply source 20 through the second fluid main pipe 21 to the second fluid branch pipes 211, 212, etc., and the second fluid branch pipe valves (V1, V2,...・) are blocked by the first flow paths V11 and V22.

(S2: Start of spraying) The first fluid (air) control valve 30 is opened in response to a command from the humidification controller 70. Note that the first fluid (air) control valve 30 may be opened in response to a command from the spray start control means 50, a manual switch, a wireless switch, or the like.
A first fluid (air) is sent from the first fluid main pipe 11 to the first fluid branch pipes (111, 112, . . . ). As a result, the first fluid (air) passes from the third flow path (V13, V23) of the second fluid branch pipe valve (V1, V2, . . . ) to the second flow path (V12, V22) to the second fluid nozzle (1 , 2), and the first fluid (air) is sent to the gas injection section of the two-fluid nozzle. A first fluid (air) is sent from the first fluid main pipe 11 to the pilot pipe 113.
The pressure is measured by a pressure measuring device 40.

(S3) The operation start control means 50 controls the pilot signal pressure when the pressure measurement value (PV) of the pressure measuring device 40 becomes equal to or higher than the first set pressure value (SV1: 470 kPa, higher than the second pressure). A command is given to the valve 45 to control the valve to open.
(S4) Pilot signal pressure control valve 45 opens. As a result, the pilot signal pressure is sent to the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve. When the pilot signal pressure of the three-way valve is equal to or higher than the ON/OFF switching setting value and changes from OFF to ON, the third flow path (right side valves V13, V23) is closed, and the first flow path (upper valves V11, V21) is The two flow paths (lower valves V12, V22) are opened, the second fluid (water) flows from the first flow path (upper valves V11, V21) to the second flow path (lower valves V12, V22), and the second fluid nozzle ( 1, 2,...) is sent to the liquid agent injection section.

(S5) In the two-fluid nozzles (1, 2, . . . ), the second fluid (water) and the first fluid (air) are internally mixed and fine particles are injected.
(S6) Steady operation is maintained.

(S7: Stop spraying) The first fluid (air) control valve 30 is closed in response to a command from the humidification controller 70. The first fluid (air) control valve 30 may be closed in response to a command from the spray stop control means 60, a manual switch, a wireless switch, or the like. The supply of the first fluid (air) from the first fluid main pipe 11 to the first fluid branch pipes (111, 112, . . . ) is blocked. The supply of the first fluid (air) from the first fluid main pipe 11 to the pilot pipe 113 is cut off. The pressure is measured by a pressure measuring device 40.

(S8) When the pressure measurement value (PV) of the pressure measuring device 40 becomes less than the second set pressure value (SV2: 470 kPa), the spray stop control means 60 instructs the pilot signal pressure control valve 45 to control to close.
(S9) Close the pilot signal pressure control valve 45. The feeding of the first fluid (air) as the pilot signal pressure is cut off, and the pilot pressure of the three-way valve of the pilot signal pressure control valve 45 is released to atmospheric pressure. As a result, the pilot signal pressure to the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve disappears.
When the pilot signal pressure of the three-way valve of the second fluid branch pipe valve (V1, V2,...) changes from ON to OFF state when it is less than the ON/OFF switching setting value, ), the first flow path (upper valves V11, V21) is closed, and the second flow path (lower valves V12, V22) is opened from the third flow path (right side valves V13, V23) to the first fluid (air). flows from the third flow path (right side valves V13, V23) to the second flow path (lower valves V12, V22), and is sent to the liquid agent injection part of the two-fluid nozzle (1, 2, . . . ).

(S10) The first fluid (first Due to the flow of the residual pressure in the fluid main pipe 11, the second fluid branch pipes (211, 212, ...) downstream from the second fluid branch pipe valves (V1, V2, ...) and the two-fluid nozzle (1 The second fluid (residual water) remaining in the liquid injection part and the liquid pipe of the parts (2, . . . ) is discharged (blown away).

(cross needle nozzle)
The basic concept structure of a two-fluid nozzle is shown with reference to FIG.
The two-fluid nozzle 1 has two gas injection sections 1a and 1b and one liquid agent injection section 1c that injects liquid. The two gas injection parts 1a and 1b are connected to an internal air pipe that is connected to the first fluid branch pipe 111, and compressed air is ejected from the two gas injection parts 1a and 1b. One liquid agent injection part 1c is connected to an internal liquid flow path connected to a pipe downstream of the second fluid branch pipe valve V1, and water is injected therein. A collision part E formed by colliding both compressed air 1a1 and 1b1 injected from the two gas injection parts 1a and 1b in front of the tip of the liquid agent injection part 1c, or a part including the collision part E, and the liquid agent injection part 1c. The mist F that is atomized by colliding with the liquid 1c1 injected in is sprayed forward in the spraying direction. The angle formed by the injection directions of the two gas injection parts 1a and 1b is preferably 45 degrees or more and 180 degrees or less.

(Spray device of alternative example 1 of embodiment 1)
With reference to FIG. 4, the configuration of a spray device A2 according to another example 1 of the first embodiment will be described. In the spraying device A2, the components having the same reference numerals as those in the spraying device A1 (FIG. 1) of the first embodiment have the same functions, so the explanation will be omitted or simply explained.
In the spray device A1 of Embodiment 1, the two-fluid branch pipe valve and the two-fluid nozzle were configured as a one-to-one set. In the spray device A2 of Example 1, two two-fluid nozzles (1A, 1B, 2A, 2B) were connected to one second fluid branch pipe valve (V1, V2, . . . ) downstream thereof. It is the composition. Note that a set of three or more two-fluid nozzles may be used.
A branch pipe 111a branching from the first fluid branch pipe 111 is connected to the pipe of the gas injection part of the two-fluid nozzle 1A, and a branch pipe 111b is connected to the pipe of the gas injection part of the two-fluid nozzle 1B. The first fluid branch pipe 111 may also serve as one of the branch pipes.
A branch pipe 211a branching from the second fluid branch pipe 211 downstream of the second fluid branch pipe valve V1 is connected to the pipe of the liquid injection part of the two-fluid nozzle 1A, and a branch pipe 211b is connected to the pipe of the liquid injection part of the two-fluid nozzle 1B. Connected to piping. The second fluid branch pipe 211 may also serve as one of the branch pipes.
A branch pipe 112a branching from the first fluid branch pipe 112 is connected to the pipe of the gas injection part of the two-fluid nozzle 2A, and a branch pipe 112b is connected to the pipe of the gas injection part of the two-fluid nozzle 2B. The first fluid branch pipe 112 may also serve as one of the branch pipes.
A branch pipe 212a branching from the second fluid branch pipe 212 downstream of the second fluid branch pipe valve V2 is connected to the pipe of the liquid injection part of the two-fluid nozzle 2A, and a branch pipe 212b is connected to the pipe of the liquid injection part of the two-fluid nozzle 2B. Connected to piping. The second fluid branch pipe 212 may also serve as one of the branch pipes.
The operational flow at the start of spraying and during spraying is the same.

(Spray device of alternative example 2 of embodiment 1)
Referring to FIG. 5, the configuration of a spray device A3 according to another example 2 of the first embodiment will be described. In the spray device A3, the components having the same reference numerals as those in the spray devices A1 and A2 (FIGS. 1 and 4) of the first embodiment have the same functions, so the explanation will be omitted or only briefly explained.
In the spray device A3, a second fluid main pipe control valve 25 is provided in the second fluid main pipe 21 upstream of each of the second fluid branch pipes 211 and 212. The second fluid main control valve 25 is an electromagnetically driven valve.
At the start of spraying, the second fluid main control valve 25 is opened and the second fluid (water) is sent to the second fluid branch pipes 211 and 212. The valve of the second fluid main control valve 25 may be opened in response to a command from the humidification controller 70, or the valve may be opened in response to a command from the spray start control means 50, a manual switch, a wireless switch, etc. Good too.
The spray stop control means 60 controls the second fluid main control valve when the measured pressure value (PV) measured by the pressure measuring device 40 becomes less than a second preset pressure value (SV2). 25, and the pilot signal pressure control valve 45 is controlled to be closed at the same timing or later.
Thereby, even if the second fluid branch pipe valves (V1, V2, . . . ) are out of order, it is possible to prevent the second fluid (water) from being sent to the two-fluid nozzle.

(Spraying device of alternative example 3 of embodiment 1)
Another example 3 is a combination configuration of other examples 1 and 2. In other words, one second fluid branch pipe valve (V1, V2, . . . ) is connected to two two-fluid nozzles (1A, 1B, 2A, 2B) downstream thereof, and the second fluid main This configuration includes a pipe control valve 25.

(Embodiment 2)
6 and 7, the configuration and operation flow of the spray device B1 of the second embodiment will be explained. In the spray device B1, the components having the same reference numerals as those in the spray device A1 (FIG. 1) of the first embodiment have the same functions, so the explanation will be omitted or will be briefly explained.

The spray device B1 includes one or more two-fluid nozzles (1, 2, . . . ) and a first fluid (air) to the two-fluid nozzles (1, 2, . . . ) at a first pressure (for example, 500 kPa). a first fluid supply source 10 for supplying a first fluid, a first fluid main pipe 11 for sending a first fluid (air) from the first fluid supply source 10 to the two fluid nozzles (1, 2, . . . ); A second fluid supply source 20 for supplying a second fluid (water) at a second pressure (for example, 450 kPa) to the fluid nozzles (1, 2, . . . ); 1, 2,...) for sending a second fluid (water) to the second fluid main pipe 21. Although two two-fluid nozzles are shown in FIG. 6, the present invention is not limited to this, and three or more two-fluid nozzles may be provided.

The first fluid branch pipe 111 is a branch pipe for branching from the first fluid main pipe 11 and sending the first fluid (air) to the two-fluid nozzle 1. The first fluid branch pipe 112 is a branch pipe for branching from the first fluid main pipe 11 and sending the first fluid (air) to the two-fluid nozzle 2 . First fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.
The third flow path branch pipe 1111 branches from the first fluid branch pipe 111 connected to the two-fluid nozzle 1 and is connected to the third flow path (right side valve V13) of the second fluid branch pipe valve V1. . The third flow path branch pipe 1121 branches from the first fluid branch pipe 112 connected to the two-fluid nozzle 2 and is connected to the third flow path (right side valve V23) of the second fluid branch pipe valve V2. . Branch piping for the third flow path is also provided in accordance with the number of two-fluid nozzles.

The second fluid branch pipe 211 is a branch pipe for branching from the second fluid main pipe 21 and sending the second fluid (water) to the two-fluid nozzle 1. The second fluid branch pipe 212 is a branch pipe for branching from the second fluid main pipe 21 and sending the second fluid (water) to the two-fluid nozzle 2. Second fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.

The second fluid branch pipe valve V1 is a three-way valve provided in the second fluid branch pipe 211 upstream of the two-fluid nozzle 1. The second fluid branch pipe valve V2 is a three-way valve provided in the second fluid branch pipe 212 upstream of the two-fluid nozzle 2. Valves for second fluid branch pipes are also provided in accordance with the number of two-fluid nozzles.

The pilot branch pipe 1141 is a branch pipe that branches from the first fluid main pipe 11 and sends the first fluid (air) to the two-fluid nozzle 1 as a pilot signal pressure. The pilot branch pipe 1142 is a branch pipe that branches from the first fluid main pipe 11 and sends the first fluid (air) to the two-fluid nozzle 2 as a pilot signal pressure. Pilot branch piping is also provided in accordance with the number of two-fluid nozzles.

The first fluid (air) control valve 30 is provided in the first fluid main pipe 11 . The first fluid (air) control valve 30 is an electromagnetically driven valve.
The pressure measuring device 41 is provided in the first fluid main pipe 11 downstream of the first fluid (air) control valve 30 and measures the pressure (inside pipe pressure) of the first fluid (air).

When the second fluid branch pipe valves (V1, V2,...) are three-way valves, when the pilot signal pressure is equal to or higher than the ON/OFF switching setting value (for example, 200 kPa) and the state changes from OFF to ON, the third flow (right side valve V13 in FIG. 6) is closed, the second flow path (lower valves V12, V22 in FIG. 6) is opened from the first flow path (upper valves V11, V21 in FIG. 6), and the second fluid (water ) flows from the first flow path (upper valves V11, V21) to the second flow path (lower valves V12, V22). When the pilot signal pressure is less than the ON/OFF switching setting value and the state changes from ON to OFF, the first flow path (upper valves V11, V21) is closed, and the third flow path (right side valves V13, V23) is switched from the second flow path to the ON/OFF switching setting value. (Lower valves V12, V22) are opened and the first fluid (gas) flows.

The relief pipe 26 is a pipe for branching from the second fluid main pipe 21 upstream of the second fluid branch pipes 211, 212, . . . and discharging the second fluid (water).
The relief valve 261 is provided in the relief piping 26, opens at a relief set pressure, and adjusts the pressure on the primary side to the relief set pressure.
The relief gate valve 262 is provided in the relief piping 26 downstream from the relief valve 261. The relief gate valve 262 is an electromagnetically driven valve.

Humidification controller 70 sends an electrical command to open first fluid (air) control valve 30 at the start of spraying.
The spray start control means 50 starts the supply of the first fluid by means for starting the supply of the first fluid (air) (driving the first fluid supply source 10, opening the first fluid control valve 30), and , the relief gate valve 262 is closed when the measured pressure value PV measured by the pressure measuring device 41 exceeds a preset first set pressure value (SV1).
Before starting spraying, the relief valve 261 is activated and the relief gate valve 262 is open. In this state, the second fluid (water) is being released from the relief pipe 26, and the second fluid branch pipe valves (V1, V2,...) are OFF, so the second fluid main pipe 21 is , the hydraulic pressure is maintained at a relief set pressure (for example, 100 kPa). When the first fluid control valve 30 is opened and the measured pressure value (PV) of the pressure measuring device 41 increases, and the measured pressure value (PV) exceeds the first set pressure value (SV1), the relief gate valve 262 Close. Since the relief gate valve 262 is closed, substantially no second fluid (water) is released from the relief pipe 26. The pressure of the first fluid (air) becomes sufficiently large before the pressure of the second fluid (water) increases. In this state, when the second fluid branch pipe valves (V1, V2, . . . ) are switched to the ON state, fine mist can be generated.

Humidification controller 70 sends an electrical command to close first fluid control valve 30 when spraying is stopped.
The spray stop control means 60 opens the relief gate valve 262 when the measured pressure value (PV) measured by the pressure measuring device 41 becomes less than a second preset pressure value (SV2).
The relief gate valve 262 opens, and the second fluid (water) sent from the relief valve 261 is released through the relief gate valve 262. Thereby, the immediate response of discharge from the relief pipe 26 can be improved.
With this configuration, the second fluid (water) is released from the relief pipe 26, and the second fluid (water) pressure in the second fluid main pipe 21 downstream of the relief pipe 26 is rapidly reduced. The pressure of the first fluid (air) in the gas injection parts 1a and 1b of the two-fluid nozzle suddenly becomes higher than the pressure of the second fluid (water) in the liquid injection part 1c of the two-fluid nozzle (for example, when During operation, the pressure difference of 50 kPa decreases more rapidly with water pressure, resulting in a pressure difference of 200 kPa or more), and a backflow phenomenon occurs in which the first fluid (air) from the gas injection parts 1a and 1b flows to the liquid injection part 1c. . In other words, the second fluid (water) in the second fluid branch pipes 211, 212, ... downstream from the second fluid branch pipe valves V1, V2, ... and the second fluid nozzles 1, 2, ... Due to the backflow phenomenon of the first fluid (air) returning from the fluid nozzle tip to the inside of the nozzle (reverse pressure is, for example, 150 to 250 kPa), the second fluid branch valves V1, V2, etc. on the upstream side The water is allowed to flow back into the pipes 211, 212, . Next, as the pilot pressure decreases, the first flow paths V11, V21 of the second fluid branch pipe valves V1, V2, . . . of the three-way valve are closed.
The first set pressure value (SV1) and the second set pressure value (SV2) may be the same value, and the spray start control means 50 and the spray stop control means 60 may be configured with the same pressure switch.

(Operation flow)
The operation flow at the time of starting and stopping the operation will be explained with reference to FIG.
(S21) The first fluid (air) control valve 30 is closed. The relief valve 261 is in operation, and the relief gate valve 262 is in an open state. The second fluid branch pipe valves (V1, V2, . . . ) are in the OFF state (the third flow paths V13, V23 and the second flow paths V12, V22 are in the open state). Air at a predetermined pressure of 500 kP is supplied from the first fluid (air) supply source 10 to the first fluid main pipe 11, and is shut off by the first fluid (air) control valve 30. Water is supplied from the second fluid (water) supply source 20 to the second fluid branch pipes 211, 212, etc. through the second fluid main pipe 21, and the relief valve 261 causes the upstream second fluid main pipe 21, second fluid The pressure in the branch pipes 211 and 212 is maintained at a relief set pressure of 100 kPa. The first flow paths V11 and V22 of the second fluid branch pipe valves (V1, V2, . . . ) are blocked.
In addition, as another embodiment, the relief pipe 26 may be connected to a circulation pipe returning to the second fluid main pipe 21, or may be connected to a drain pipe, and may be configured to be sent to the second fluid supply source 20. It may be.

(S22: Start of spraying) The first fluid (air) control valve 30 is opened in response to a command from the humidification controller 70. The first fluid (air) control valve 30 may be opened in response to a command from the spray start control means 50, a manual switch, a wireless switch, or the like.
A first fluid (air) is sent from the first fluid main pipe 11 to the first fluid branch pipes (111, 112, . . . ). As a result, the first fluid (air) passes from the third flow path (V13, V23) of the second fluid branch pipe valve (V1, V2, . . . ) to the second flow path (V12, V22) to the second fluid nozzle (1 , 2), and the first fluid (air) is sent to the gas injection section of the two-fluid nozzle.
A first fluid (air) is sent from the first fluid main pipe 11 to pilot branch pipes 1141 and 1142.
The pressure is measured by a pressure measuring device 41.

(S23) The first fluid (air) sent from the pilot branch pipes 1141 and 1142 is sent to the second fluid branch pipe valves (V1, V2, . . . ) of the three-way valve. When the pilot signal pressure of the three-way valve is equal to or higher than the ON/OFF switching setting value (for example, 150 to 200 kPa) and changes from OFF to ON, the third flow path (right side valves V13 and V23) is closed, and the first flow path (upper The second flow path (lower valves V12, V22) is opened from the valves V11, V21).
(S24) Furthermore, when the pressure of the first fluid main pipe 11 increases and the measured pressure value (PV) of the pressure measuring device 41 becomes equal to or higher than the first set pressure value (SV1, 470 kPa), the spray start control means 50 Relief gate valve 262 is closed. As a result, the pressure of the second fluid main pipe 21 rises to the second pressure (450 kPa) of the second fluid supply source 20, and the second fluid branch pipes 211, 212 and the second fluid branch pipe valves (V1, V2 The second fluid (water) is sent to the liquid agent injection part of the two-fluid nozzle (1, 2, . . . ) through the first flow paths V11, V21 and the second flow paths V12, V22 of the two-fluid nozzles (1, 2, . . . ).

(S25) In the two-fluid nozzles (1, 2, . . . ), the second fluid (water) and the first fluid (air) are internally mixed and fine particles are injected.
(S26) Steady operation is maintained.

(S27: Stop spraying) The humidification controller 70 closes the first fluid (air) control valve 30. The first fluid (air) control valve 30 may be closed in response to a command from the spray stop control means 60, a manual switch, a wireless switch, or the like. The supply of the first fluid (air) from the first fluid main pipe 11 to the first fluid branch pipes (111, 112, . . . ) and the pilot branch pipes 1141, 1142 is cut off. The pressure is measured by a pressure measuring device 41.

(S28) The spray stop control means 60 opens the relief gate valve 262 when the pressure measurement value (PV) of the pressure measuring device 41 becomes less than the second set pressure value (SV2: 470 kPa), and the second fluid ( water) is released from the relief pipe 26.
(S29) The second fluid (water) pressure in the second fluid main pipe 21 downstream of the relief pipe 26 is rapidly reduced. (For example, the relief set pressure is lowered to, for example, 100 kPa.) The pressure of the first fluid (air) in the gas injection parts 1a and 1b of the two-fluid nozzle becomes relatively suddenly higher than the pressure of the second fluid (water) in the liquid injection part 1c of the two-fluid nozzle, A reverse phenomenon (backflow phenomenon) occurs in which the first fluid (air) from the gas injection parts 1a, 1b flows to the liquid agent injection part 1c. The second fluid (water) is pushed back by the backflow of the first fluid (air), and no dripping occurs.
Backflow (reverse flow) occurs when the second fluid (water) decreases to the relief set pressure (for example, 100 kPa) earlier than the pilot signal pressure becomes less than the ON/OFF switching set value (for example, 150 to 200 kPa), and then This phenomenon is caused by the first fluid (air) having a pressure (ON/OFF switching setting value) greater than that of the first fluid (air).

(S30) When the pilot signal pressure decreases and becomes less than the ON/OFF switching setting value (for example, 150 to 200 kPa), the three-way valve changes from ON to OFF, and the first flow paths V11 and V12 close. The third flow paths V13 and V23 and the second flow paths V12 and V22 are opened.

(Spray device of alternative example 1 of embodiment 2)
Referring to FIG. 8, the configuration of a spray device B2 according to another example 1 of the second embodiment will be described. In the spray device B2, the components having the same reference numerals as those in the spray device B1 (FIG. 6) of the second embodiment have the same functions, so the explanation will be omitted or simply explained.
In the spray device B1 of the second embodiment, the two-fluid branch pipe valve and the two-fluid nozzle were configured in a one-to-one set. In the spray device B2 of Example 1, two two-fluid nozzles (1A, 1B, 2A, 2B) were connected downstream of one second fluid branch pipe valve (V1, V2, . . . ). It is the composition. Note that a set of three or more two-fluid nozzles may be used.
A branch pipe 111a branching from the first fluid branch pipe 111 is connected to the pipe of the gas injection part of the two-fluid nozzle 1A, and a branch pipe 111b is connected to the pipe of the gas injection part of the two-fluid nozzle 1B. The first fluid branch pipe 111 may also serve as one of the branch pipes.
A branch pipe 211a branching from the second fluid branch pipe 211 downstream of the second fluid branch pipe valve V1 is connected to the pipe of the liquid injection part of the two-fluid nozzle 1A, and a branch pipe 211b is connected to the pipe of the liquid injection part of the two-fluid nozzle 1B. Connected to piping. The second fluid branch pipe 211 may also serve as one of the branch pipes.
A branch pipe 112a branching from the first fluid branch pipe 112 is connected to the pipe of the gas injection part of the two-fluid nozzle 2A, and a branch pipe 112b is connected to the pipe of the gas injection part of the two-fluid nozzle 2B. The first fluid branch pipe 112 may also serve as one of the branch pipes.
A branch pipe 212a branching from the second fluid branch pipe 212 downstream of the second fluid branch pipe valve V2 is connected to the pipe of the liquid injection part of the two-fluid nozzle 2A, and a branch pipe 212b is connected to the pipe of the liquid injection part of the two-fluid nozzle 2B. Connected to piping. The second fluid branch pipe 212 may also serve as one of the branch pipes.
The operational flow is the same when spraying starts and when spraying stops.

(Spray device of alternative example 2 of embodiment 2)
Referring to FIG. 9, the configuration of a spray device B3 according to another example 2 of the second embodiment will be described. In the spray device B3, the components having the same reference numerals as those in the spray devices B1 and B2 (FIGS. 6 and 8) of the second embodiment have the same functions, so the explanation will be omitted or only briefly explained.
In the spray device B3, a second fluid main pipe control valve 25 is provided in the second fluid main pipe 21 upstream of each second fluid branch pipe 211, 212. The second fluid main control valve 25 is an electromagnetically driven valve.
At the start of spraying, the second fluid main control valve 25 is opened and the second fluid (water) is sent to the second fluid branch pipes 211 and 212. The valve of the second fluid main control valve 25 may be opened in response to a command from the humidification controller 70, or the valve may be opened in response to a command from the spray start control means 50, a manual switch, a wireless switch, etc. Good too.
The spray stop control means 60 controls the second fluid main control valve when the measured pressure value (PV) measured by the pressure measuring device 41 becomes less than a second preset pressure value (SV2). 25 is closed, and the relief gate valve 262 is controlled to be opened at the same timing or earlier.
Thereby, even if the second fluid branch pipe valves (V1, V2, . . . ) or the relief gate valve 262 are out of order, it is possible to prevent the second fluid (water) from being sent to the two-fluid nozzle.

(Spraying device of alternative example 3 of embodiment 2)
Referring to FIG. 10, the configuration of a spray device B4 according to another example 3 of the second embodiment will be described. In the spray device B4, the components having the same reference numerals as those in the spray devices B1, B2, and B3 (FIGS. 6, 8, and 9) of the second embodiment have the same functions, so the explanation will be omitted or briefly explained.
The spray device B4 is connected to the relief pipe 26 and includes a storage tank 80 for storing the second fluid (water). The storage tank 80 includes a floating liquid level gauge 81.
When the liquid level in the storage tank 80 falls below a predetermined level as measured by the floating liquid level meter 81, the second fluid (water) is replenished from the second fluid replenishment pipe 84. The second fluid replenishment pipe 84 is connected to a second fluid (water) supply source.
The storage tank 80 includes a pump P that pumps the second fluid (water) to the second fluid supply source 20 or the second fluid main pipe 21 . The storage tank 80 may be used as the second fluid source 20 or for replenishing the second fluid source 20 .
It can be collected from the relief pipe 26 to the storage tank 80. It is possible to recycle the second fluid and there is no need to install drainage channels.

(Spray device of alternative example 4 of embodiment 2)
With reference to FIG. 11, the configuration of a spray device B5 according to another example 4 of the second embodiment will be described. In the spray device B5, the components having the same reference numerals as those in the spray devices B1, B2, B3, and B4 (FIGS. 6, 8, 9, and 10) of the second embodiment have the same functions, so explanations may be omitted or omitted. Explain briefly.
The spray device B5 is provided with check valves (check valves) C1 and C2 in the first flow path (primary side) or the second flow path branch pipes 211 and 212 of the second fluid branch pipe valves V1, V2, . ing.
The spray device B5 opens the relief gate valve 262 when the measured pressure value (PV) measured by the pressure measuring device 41 becomes less than a second preset pressure value when spraying is stopped. The second fluid (water) is released from the relief piping 26, the first flow path of the three-way valve is closed due to the pilot signal pressure drop, the third flow path and the second flow path are opened, and the spraying from the two-fluid nozzle is stopped due to the reverse pressure. let Thereafter, due to the residual pressure in the first fluid branch pipe, the remainder of the second fluid (water) in the second fluid branch pipe and the two-fluid nozzle downstream of the second fluid branch pipe valves V1, V2, etc. is released ( It is a composition of blowing away).
When the operation (spraying) is stopped, the backflow of the first fluid (air) is eliminated, and the time lag when the next operation (spraying) is started can be reduced.

(Spray device of alternative example 5 of embodiment 2)
With reference to FIG. 12, the configuration of a spray device B6 according to another example 5 of the second embodiment will be described. In the spray device B6, components with the same symbols as those in the spray device B1, B2, B3, B4, and B5 (FIGS. 6, 8, 9, 10, and 11) of Embodiment 2 have the same functions. Therefore, the explanation will be omitted or briefly explained.
In the spray device B6, the second fluid branch pipe valves V10, V20, . . . are not three-way valves but two-way valves. Even with a two-way valve, when the first fluid backflows when spraying is stopped, the second fluid can be pushed back and dripping can be suppressed.

(Spray device of alternative example 6 of embodiment 2)
With reference to FIG. 13, the configuration of a spray device B7 according to another example 6 of the second embodiment will be described. In the spray device B7, the components with the same symbols as those in the spray device B1, B2, B3, B4, B5, and B6 (FIGS. 6, 8, 9, 10, 11, and 12) of the second embodiment are as follows. Since the functions are the same, the explanation will be omitted or briefly explained.
In the spray device B7, the second fluid branch pipe valves V100, V200, . . . are configured as electromagnetically driven two-way valves.
Even with an electromagnetically driven two-way valve, the backflow of the first fluid occurs when spraying is stopped, pushing back the second fluid and suppressing dripping.

At the time of starting spraying, the spray start control means 50 closes the relief gate valve 262 when the measured pressure value (PV) of the pressure measuring device 41 becomes equal to or higher than the first set pressure value (SV1, 470 kPa).
Similarly, the spray start control means 50 transmits an electrical command to the second fluid when the measured pressure value (PV) measured by the pressure measuring device 41 becomes equal to or higher than the first set pressure value (SV1=470 kPa). Send it to branch pipe valves V100 and V200 and open the valves.
When stopping the spraying, the spraying stop control means 60 opens the relief gate valve 262 when the pressure measurement value (PV) of the pressure measuring device 41 becomes less than the second set pressure value (SV2: 470 kPa). Fluid (water) is released from the relief pipe 26. Next, the spray stop control means 60 issues an electrical command when the measured pressure value (PV) measured by the pressure measuring device 41 becomes less than a preset set pressure value (SV2 = 200 kPa). The fluid is sent to the second branch pipe valves V100 and V200, and the valves are closed. By the time this valve is closed, the second fluid is pushed back due to the backflow phenomenon of the first fluid.

(Another embodiment)
(1) In Embodiment 1, the second fluid branch pipe valves V1, V2, . . . may be configured with two-way valves instead of three-way valves.
(2) In Embodiments 1 and 2, the second fluid branch pipe valves V1, V2, etc. may be configured with electromagnetically driven valves instead of air-driven valves.

Claims (7)

two or more two-fluid nozzles;
a first fluid supply source for supplying a first fluid at a first pressure to the two-fluid nozzle;
a first fluid main for delivering a first fluid from the first fluid source to the two-fluid nozzle;
a first fluid branch pipe branching from the first fluid main pipe to send a first fluid to each of the two-fluid nozzles;
a second fluid supply source for supplying a second fluid at a second pressure to the two-fluid nozzle;
a second fluid main for delivering a second fluid from the second fluid source to the two-fluid nozzle;
a second fluid branch pipe branching from the second fluid main pipe to send a second fluid to each of the two-fluid nozzles;
a second fluid branch pipe valve provided in each of the second fluid branch pipes upstream of the two-fluid nozzle;
a pressure measuring device that measures the pressure of the first fluid at any position from the first fluid supply source to the two-fluid nozzle;
When the measured pressure value (PV) measured by the pressure measuring device becomes equal to or higher than a preset first set pressure value, the second fluid branch pipe valve is changed from the closed state to the open state, and the Spray start control means for controlling sending a second fluid to the two-fluid nozzle;
When the measured pressure value (PV) measured by the pressure measuring device becomes less than a preset second set pressure value, the second fluid branch pipe valve is changed from the open state to the closed state, and the second fluid branch pipe valve is changed from the open state to the closed state. Spray stop control means for blocking the second fluid from being sent to the two-fluid nozzle and controlling dripping of the second fluid remaining in the second fluid branch pipe downstream from the second fluid branch pipe valve; Equipped with
Spraying device. The first fluid branched from the first fluid main pipe is used as a pilot signal pressure for controlling the second fluid branch pipe valve, and the spray stop control means controls the second measurement measured by the pressure measuring device. When the pressure value (PV) becomes less than a preset second set pressure value, the air-driven three-way valve shuts off the supply of the first fluid used for the pilot signal pressure. controls the second fluid branch pipe valve of the three-way valve to close the flow of the second fluid from the first flow path to the second flow path of the second fluid branch pipe valve of the three-way valve to cut off new feeding; The flow of the first fluid from the flow path to the second flow path releases the second fluid remaining in the downstream second fluid branch pipe and the two-fluid nozzle from the second fluid branch valve, or
The spray stop control means controls the electromagnetically driven three-way valve when a second measured pressure value (PV) measured by the pressure measuring device becomes less than a second preset pressure value. controlling the second fluid branch valve to close the flow of the second fluid from the first flow path to the second flow path of the second fluid branch valve of the three-way valve to cut off new feeding; releasing the second fluid remaining in the second fluid branch pipe and the two-fluid nozzle downstream from the second fluid branch pipe valve by the flow of the first fluid from the second fluid branch pipe to the second flow path;
The spray device according to claim 1. The spray device includes:
a relief pipe for discharging the second fluid branched from the second fluid main pipe and sent to the two-fluid nozzle;
further comprising a relief control unit that controls release of the second fluid in the relief piping,
The spray stop control means includes:
When the measured pressure value (PV) measured by the pressure measuring device becomes less than a preset second set pressure value, the relief control section is controlled to release the second fluid from the relief piping. , the second fluid branch downstream from the second fluid branch pipe valve and the second fluid in the two-fluid nozzle are connected to the second fluid branch on the upstream side by a backflow phenomenon of the first fluid returning from the tip of the two-fluid nozzle to the inside of the nozzle. controlling the second fluid branch valve;
The spray device according to claim 1. The spray device includes:
a second fluid main control valve in the second fluid main, upstream of the relief pipe;
a storage tank connected to the relief piping and for storing a second fluid;
a pump that pumps the second fluid from the storage tank to the second fluid supply source;
and/or
further comprising a check valve provided in the first flow path of the second fluid branch pipe valve;
The spray device according to claim 3. A spraying method using the spraying device according to claim 1,
When the measured pressure value (PV) measured by the pressure measuring device becomes equal to or higher than a preset first set pressure value (SV1), the second fluid branch pipe valve is changed from the closed state to the open state, a spray start control step that controls sending the second fluid to the two-fluid nozzle;
When the measured pressure value (PV) measured by the pressure measuring device becomes less than the preset second set pressure value (SV2), change the second fluid branch valve from the open state to the closed state, a spray stop control step of blocking the second fluid from being sent to the two-fluid nozzle and controlling dripping of the second fluid remaining in the second fluid branch pipe downstream from the second fluid branch pipe valve;
including spraying methods. The spray device includes:
The first fluid branched from the first fluid main pipe is used as a pilot signal pressure for controlling the valve for the second fluid branch pipe, and the spray stop control step includes a second measured pressure value ( PV) becomes less than a preset second set pressure value, the second pressure of the air-driven three-way valve is cut off by cutting off the supply of the first fluid used for the pilot signal pressure. The fluid branch pipe valve is controlled to close the flow of the second fluid from the first flow path to the second flow path of the second fluid branch valve of the three-way valve to cut off new feeding, and to close the flow of the second fluid from the third flow path to the second fluid flow path. The flow of the first fluid into the second flow path releases the second fluid remaining in the downstream second fluid branch pipe and the two-fluid nozzle from the second fluid branch valve, or
In the spray stop control step, when a second measured pressure value (PV) measured by a pressure measuring device becomes less than a preset second set pressure value, the spray stop control step stops the electromagnetically driven three-way valve. controlling the two-fluid branch pipe valve, closing the flow of the second fluid from the first flow path to the second flow path of the second fluid branch valve of the three-way valve to cut off new feeding; releasing the second fluid remaining in the downstream second fluid branch pipe and the two-fluid nozzle from the second fluid branch pipe valve by the flow of the first fluid into the second flow path;
The spraying method according to claim 5. The spray device includes:
a relief pipe for discharging a second fluid branched from the second fluid main pipe and sent to the two-fluid nozzle;
further comprising a relief control unit that controls release of the second fluid in the relief piping,
The spray stop control step includes:
When the measured pressure value (PV) measured by the pressure measuring device becomes less than the preset second set pressure value, the relief control section is controlled to release the second fluid from the relief piping, and the second fluid is released from the relief piping. The second fluid in the second fluid branch pipe and the two-fluid nozzle downstream from the two-fluid branch pipe valve flows back to the second fluid branch pipe on the upstream side due to the backflow phenomenon of the first fluid returning from the tip of the two-fluid nozzle to the inside of the nozzle. and then controlling the second fluid branch valve.
The spraying method according to claim 5.