JPS6113862B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection dilution device for injecting and diluting pesticides and the like into a main water supply pipe in a pipeline system for spraying pesticides and the like.

Most conventional continuous dilution devices for pesticides, etc. use the water pressure of the main water pipe to inject the pesticide, etc. The differential pressure between the front and rear is used as the driving source for the diluter. Therefore, it is necessary to increase the pump capacity by the difference in pressure, and it is also necessary to increase the diameter of the pipeline in order to minimize pressure loss. Furthermore, if such equipment is installed in an existing pipeline system, the discharge pressure of the sprinkler at the end will decrease, making it impossible to achieve uniform spraying in each spraying block, and attempting to compensate for this will result in unnecessary overspraying. In some cases, this was virtually impossible.

The present inventor has already improved this point and has filed an application for an injection dilution device for pesticides, etc. that uses compressed air, which is easily required in the field, without relying on water supply pressure for the driving force for injecting chemical solutions. This has been improved to ensure more reliable operation.

Hereinafter, the present invention will be explained in detail with reference to the drawings.
The drawing is a schematic diagram of an embodiment of an injection dilution device according to the invention. In the figure, 1 indicates the main water supply pipe, A indicates the water source side, and B indicates the distribution side.

2 is a flow meter installed in the middle of the main water supply pipe 1; 3 is a chemical liquid metering tank whose bottom and top cover are each formed into a conical shape; one end of a chemical liquid injection pipe 4 is attached to the top corner of the tank bottom; The other end of the chemical injection pipe 4 is the main water pipe 1
The flow meter 2 is connected to the dispersion side via a check valve 5. An air vent pipe 6 is attached to the top corner of the upper lid of the tank, and a compressed air pipe 7 communicating with the compressor 8 is attached to the conical surface thereof.

Reference numerals 9 and 10 indicate on-off valves provided in the air vent pipe 6 and the compressed air pipe 7, respectively.

Furthermore, the chemical solution supply pipe 12 of the chemical solution tank 11 is connected to the chemical solution injection pipe 4 that communicates between the lower bottom of the chemical solution metering tank 3 and the check valve 5.
Install. 13 is a check valve provided in the pipe.

15 is a signal wiring connecting the flow meter 2 and the compressor 8, and 16 is a signal wiring connecting the flow meter 2 and the on-off valves 9 and 10, respectively. 14 is chemical liquid quantitative tank 3
The float fits in the top corner of the bottom of the tank when it is empty, and in the top corner of the top lid when the tank is filled with chemical solution.

The action and effect will be explained.

Under normal conditions, the on-off valve 10 is closed and the on-off valve 9 is open, so that the chemical liquid in the chemical liquid tank 11 pushes open the check valve 13 and float 14 from the chemical liquid supply pipe 12 due to the natural head, and flows into the chemical liquid metering tank. 3 is filled.

At this time, the check valve 5 is not pushed open by the pressure equal to the natural head, so the chemical solution does not enter the main water pipe 1. As the chemical solution is filled, the float 14 floats up and finally fits into the top corner of the upper lid of the tank, closing the opening of the air vent pipe 6.

Next, when a certain amount of water flows through the main water supply pipe 1, the flowmeter 2 detects this and issues a signal, which opens the on-off valve 10 and closes the on-off valve 9.

As a result, the compressed air from the compressor 8 is introduced into the tank through the compressed air pipe 7, and the pressure of this compressed air is sufficient to push open the check valve 5 and overcome the water pressure in the main water pipe 1. Therefore, the chemical solution filled in the chemical solution metering tank 3 is pushed out from the tank and injected into the water supply main pipe 1 via the chemical solution injection pipe 4. When all the chemical solutions in the same tank have been injected, the float 14
sinks into the bottom corner of the tank bottom and closes the opening of the injection pipe 4. Therefore, compressed air will not be mixed into the main water pipe 1. When injecting the chemical solution into the main water supply pipe 1, pressurized air acts on the chemical solution metering tank 3, so the chemical solution does not flow into the metering tank 3 from the chemical solution tank 11, and the action of the check valve 13 is prevented. This prevents the chemical liquid from flowing back into the chemical liquid tank 11.

When one injection is completed in this way, the on-off valves 9 and 10 are switched, valve 9 is opened and valve 10 is closed, and the metering tank 3 is filled with the chemical solution again.
Prepare for the next drug injection.

When filling this chemical solution, the chemical solution injection pipe 4 is in communication with the chemical solution supply pipe 12, so that the inside of the chemical solution injection tube 4 does not become negative pressure, and therefore, the float 14 is moved by the negative pressure into the chemical solution metering tank. 3, and can be moved smoothly and freely.

Then, in response to the next signal from the flow meter 2, the valve 9 is closed and the valve 10 is opened, and the chemical liquid injection is repeated.

In this way, by operating the on-off valves 9 and 10 in accordance with the signal emitted from the flowmeter 2 every time the amount of water fed through the main water pipe 1 is constant, it is possible to inject an amount of chemical liquid proportional to the amount of water fed.

Note that the check valve 5 can of course be an on-off valve operated by a signal from the flow meter 2.

As described above, the present invention does not require any consideration such as increasing the diameter of the water main pipe in order to reduce the pressure loss as in the past, and has a simple mechanism that utilizes compressed air, which is easily available on site. This purpose can be achieved, and even if there is no compressed air equipment, a small compressor is sufficient, and furthermore, even if it is attached to an existing chemical spraying device, it will not affect the spraying at all.

This device has a simple configuration, which makes it easy to clean the chemical solution and to easily apply corrosion-resistant treatment.Also, since the on-off valve used in this device controls air, it is relatively small and easy to use. It also consumes less power and can be operated remotely and automatically.

Moreover, since the entire device can be made small and lightweight, and there is no possibility of failure during operation, maintenance and inspection are easy, continuous operation is possible, and there are no restrictions on the spraying area.

Moreover, this device has a built-in float that opens and closes the air vent pipe and the chemical injection pipe in the chemical liquid metering tank, so it not only automatically stops the chemical supply when the chemical liquid metering tank is full, but also It is possible to reliably prevent pressurized air from entering the main injection pipe after the injection of the chemical liquid into the main injection pipe is completed.

Therefore, poor water flow due to air remaining in the main water pipe does not occur.

[Brief explanation of drawings]

The drawing is a schematic diagram of an embodiment of an injection dilution device according to the invention. 1... Water supply main pipe, 3... Chemical solution metering tank, 4... Chemical solution injection pipe, 5... Check valve, 6... Air vent pipe, 7
... Pressure air pipe, 9, 10 ... Opening/closing valve, 11 ... Chemical liquid tank, 12 ... Chemical liquid supply pipe, 14 ... Float.

Claims (1)

[Claims] 1 An air vent pipe 6 is connected to the upper end of the chemical liquid metering tank 3, and a chemical liquid injection pipe 4 leading to the main water supply pipe 1 is connected to the check valve 5 at the lower end.
A compressed air pipe 7 from a compressed air source is connected to the chemical liquid metering tank 3, and a chemical liquid injection pipe 4 communicating between the lower end of the chemical liquid metering tank 3 and the check valve 5 is connected to a pressure air pipe 7 from the chemical liquid tank 11. A chemical solution supply pipe 12 is connected thereto, and a float 14 for opening and closing the air vent pipe 6 and the chemical solution injection pipe 4 is built in the metering tank 3, and an on-off valve 9 is provided in the compressed air pipe 7 and the air vent pipe 6, respectively. , 10 and a flow meter 2 provided in the main water pipe 1 are connected with a signal wiring 16, and the on-off valves 9, 10 are activated by a signal from the flow meter 2 every time a certain amount of water flows through the main water pipe 1. An injection dilution device for pesticides, etc. that opens and closes.