JP3014299B2 - Chemical mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical mixing device used in an automatic irrigation system and the like, and more particularly, to a function for automatically cleaning a portion required to be cleaned such as a flow meter or a strainer provided in a chemical supply line. The present invention relates to a chemical mixing device provided.

[0002]

2. Description of the Related Art In a conventional chemical mixing apparatus having a function of cleaning a required cleaning site, a cleaning water supply flow path provided downstream of the required cleaning site and a cleaning water supply channel provided upstream of the required cleaning site are provided. A manual valve is provided in each of the discharge channels, and when cleaning is required, the operator opens both manual valves, and pressurizes the cleaning water from the cleaning water supply channel to a location requiring cleaning and discharges the cleaning water from the cleaning water discharge channel. As a result, the parts that need to be cleaned were cleaned.

[0003]

In the above-mentioned conventional chemical mixing apparatus, the mixing operation of the chemical can be performed automatically.
After the supply of the chemical solution, it is necessary to flush the washing water to the required location in order to flush the remaining chemical solution at the cleaning required location to make it clean so that the next chemical mixing operation can be started smoothly. The operator had to open both manual valves provided in the water supply flow path and the wash water discharge flow path.

[0004] The same applies to the case where an abnormality has occurred in the chemical liquid supply line due to foreign matter being caught in the flow meter or dust accumulated on the strainer. In particular, when the installation location of the chemical mixing device is far away, the operator has to go to the installation location to open the manual valve.

Further, since the chemical liquid mixing apparatus is automatically controlled, the frequency of going to the installation site is reduced, and it may not be possible to confirm the occurrence of abnormality in the chemical liquid supply line early. As a result, accurate chemical liquid mixing work cannot be performed. If the operation is continued, the accuracy of the mixing ratio may be reduced, or if the operation is performed unreasonably, a load may be applied to a flow meter or a pump of the chemical supply line, which may cause a failure or damage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to automatically perform not only mixing of a chemical solution in a ratio but also cleaning of a chemical liquid supply line where cleaning is required. It is an object to provide a mixing device.

[0007]

According to a first aspect of the present invention, there is provided a chemical mixing apparatus having an automatic cleaning function for achieving the above object, comprising connecting a main pipe flow meter to a main pipe and a chemical supply line for mixing a chemical into the main pipe. In addition, a chemical flow meter and a flow control valve are installed in the chemical supply line, and a setting device for inputting a ratio of the flow rate of the main pipe to the flow rate of the chemical supply line to a control device is provided to control the flow rate of the chemical supply line. In a chemical liquid mixing device that automatically adjusts the flow rate control valve so that a flow rate of a predetermined ratio is obtained by the device, an automatic cleaning water connected to an appropriate portion of a main pipe is provided downstream of a cleaning liquid supply line at a required cleaning position. A branch flow path having a valve is provided, and a three-way switching valve having a discharge flow path is provided on an upstream side of the washing required portion, and the automatic valve for cleaning water and the three-way switching valve are also controlled by the control device. That And it features.

In a second aspect of the present invention, the main pipe is connected with a main pipe flow meter and a chemical liquid supply line for mixing a chemical liquid into the main pipe, and a chemical liquid flow meter and a flow control valve are installed in the chemical liquid supply line. A setter for inputting the ratio of the flow rate of the chemical liquid supply line to the flow rate of the chemical liquid supply line is provided to the control device, and the flow control valve is automatically adjusted so that the flow rate of the chemical liquid supply line becomes a predetermined ratio flow rate by the control device. In a chemical solution mixing device,
A branch channel having an automatic valve for washing water connected to an appropriate portion of the main pipe is provided on the downstream side of the required location of the chemical liquid supply line, and a branch having a discharge channel on the upstream side of the required location for cleaning. An automatic valve for chemical solution and an automatic valve for drainage are respectively provided in an upstream channel and a drain channel of the branch point, and the automatic valve for washing, the automatic valve for chemical solution, and the automatic valve for drainage. Is also controlled by the control device.

The above-mentioned discharge flow path may be connected to a downstream side of the main pipe to which the chemical liquid supply line is connected,
A pipe may be provided to the water source of the washing water.

According to the present invention, the control device is provided downstream of the cleaning-needed portion when the cleaning is started, which is stored in advance in the program of the control device, such as after the supply of the chemical solution or the time set by the timer. The automatic valve for washing water in the branched flow path is opened, and the flow path of the three-way switching valve provided on the upstream side is switched to the discharge flow path. The washing water from the main pipe is discharged from the discharge passage through the branch passage through a portion requiring washing. In this manner, the portions requiring cleaning are cleaned.

In addition, a branch point having a discharge flow path is provided on the upstream side of the location requiring cleaning, and an automatic drain valve and a chemical liquid automatic valve are provided in the discharge flow path and the upstream flow path of the branch point, respectively. In such a case, the controller opens the automatic valve for washing water and the automatic valve for drainage in the branch flow path and the discharge flow path when necessary, and closes the automatic valve for chemical liquid in the upstream flow path at the branch point. In this way,
As in the case described above, the portions requiring cleaning are cleaned.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a chemical liquid mixing apparatus having an automatic cleaning function according to the present invention; FIG.

FIG. 1 shows an example in which the first invention is used in an automatic liquid fertilizer mixing and irrigation apparatus. In the figure, reference numeral 1 denotes a main pipe which is connected from a water source 20a to an irrigation site connected to a main pipe pump 2 for pumping the water 20. The main pipe 1 is connected to a main pipe flow meter 3 and has a downstream connection point 55. In the main pipe 1
The liquid supply line 4 for mixing the liquid fertilizer 10 is connected to the liquid supply line 4. The main pipe flow meter 3 is connected to the control device 11 and has a function of detecting the flow rate of the water 20 pressure-fed by the main pipe pump 2 from the water source 20a and transmitting a detection signal to the control device 11. The chemical supply line 4 has a chemical tank 1 from the upstream side.
0a, the three-way switching valve 16 whose flow path is switched by the control device 11, the strainer 9, the chemical solution pump 8 driven by the control device 11, and the flow rate of the chemical solution supply line 4 are detected and the detection signal is sent to the control device 11. Chemical flow meter 7, control device 11
The flow control valve 6 for adjusting the opening degree in response to the output signal from the controller and adjusting the flow rate of the chemical liquid supply line 4 and the check valve 5 are connected in order. In the present example, the strainer 9, the chemical pump 8, the chemical flow meter 7, and the flow control valve 6 are included in the washing required portion 50, and the three-way switching valve 16 is provided upstream thereof as described above. The remaining mouth has a discharge channel 15
Is provided. On the other hand, a branch flow path 13 branched from the upstream side of the main pipe flow meter 3 of the main pipe 1 is connected to the downstream side of the washing required point 50, and the branch flow path 13 is provided with an automatic cleaning water opening and closing by the control device 11. A valve 14 is provided. Reference numeral 12 denotes a setting device for inputting the dilution ratio of the liquid fertilizer 10 to the control device 11, and is connected to the control device 11.

Next, the operation of mixing liquid fertilizer of the present embodiment will be described. Water 2 pumped by main pipe pump 2 from water source 20a
0 indicates a liquid fertilizer 1 indicated by a solid arrow at a connection point 55 of the main pipe 1.
0 is mixed into the liquid fertilizer dilution water 30, which is irrigated by the plant 21 from the irrigation pipe 19 through the branch pipe 17 and the on-off valve 18 provided at the terminal irrigation site of the main pipe 1. The liquid fertilizer 10 to be mixed is pressurized by the chemical liquid pump 8 and the setting device 12
The flow rate is adjusted by the flow rate control valve 6 so that the dilution ratio set in the above is achieved. At this time, the control device 11 takes in the detected flow rate signal of the main pipe flow meter 3 and the detected flow rate signal of the chemical liquid flow meter 7, calculates the actual measured dilution rate, compares it with the set dilution rate input from the setting unit 12, and compares it. If the measured dilution ratio is larger than the set dilution ratio, an open signal is sent to the flow control valve 6, and if the measured dilution ratio is smaller, a close signal is sent to the flow control valve 6 to adjust the flow to approach the set dilution ratio. I have.

Next, the cleaning operation will be described. When the mixing of the predetermined liquid fertilizer is completed, the control device 11 outputs a washing signal as previously stored in the program of the control device 11 to stop the chemical liquid pump 8 to stop the supply of the liquid fertilizer to the main pipe 1 and to branch. The washing water automatic valve 14 provided in the flow path 13 is opened, and the flow path of the three-way switching valve 16 provided in the upstream flow path of the washing required point 50 is changed to the discharge flow path 15
Switch to the side. Then, the water 20 that is pressurized by the main pipe pump 2 and passes through the main pipe 1 becomes the cleaning water 35 indicated by the dotted arrow.
As a result, the portion 50 requiring cleaning is passed through the branch channel 13 and the automatic valve 14 for cleaning water, and is discharged from the discharge channel 15 through the three-way switching valve 16. The above cleaning is continued until a predetermined time stored in the program of the control device 11.

On the other hand, at the time of occurrence of an abnormality, when the control device 11 detects an abnormality detection signal from the abnormality detection device, the control device 1
1 forcibly outputs a cleaning signal to start cleaning. The operation of the cleaning is the same as described above, and will not be described. As a practical example of the abnormality detecting device, as shown in FIG. 1, a differential pressure gauge 22 for detecting a differential pressure across the strainer 9 to detect an abnormality in the flow rate of the chemical supply line 4 may be provided.

Further, the control device 11 can detect the occurrence of an abnormality based on the detected flow signal sent from the chemical liquid flow meter 7 (for example, the foreign matter is caught in the chemical liquid flow meter 7 even though the liquid fertilizer supply is in operation). 10 cannot be supplied, and the liquid fertilizer detection flow rate is zero, etc.), so that the chemical liquid flow meter 7 also functions as an abnormality detection device.

FIG. 2 shows an example in which the second invention is used in an automatic liquid fertilizer mixing and irrigation apparatus. The difference from the above-described example is that the cleaning required portion 50 is only the chemical solution flow meter 7 and the branch point 77 having the discharge flow path 23 instead of the three-way switching valve 16 on the upstream side thereof.
And an automatic drain valve 24 and a chemical liquid automatic valve 25 under the control of the control device 11 are provided in the discharge channel 23 and the upstream channel of the branch point 77.

The operation of mixing the liquid fertilizer is the same as that of the first embodiment of the present invention, and a description thereof will be omitted. Hereinafter, the operation of the cleaning will be described. When the mixing of the predetermined liquid fertilizer is completed, the control device 1 is stored in advance as stored in the program of the control device 11.
1 outputs a washing signal to stop the chemical liquid pump 8 to stop the supply of liquid fertilizer to the main pipe 1, and to provide an automatic washing water valve 14 provided in the branch passage 13 and a drainage provided in the discharge passage 23. The automatic valve 24 for chemicals is opened, and the automatic valve 25 for chemicals provided in the flow path on the upstream side of the branch point 77 is closed. Then, the washing water 35 indicated by the dotted arrow passes through the branch flow path 13 and the automatic valve 14 for cleaning water to wash the required cleaning point 50, and then passes through the branch point 77 and the automatic drainage valve 24 to be discharged from the discharge flow path 23. Is discharged. In this way, the cleaning is performed until the predetermined time stored in the program of the control device 11 is reached.

As described above, the cleaning may be started after the completion of the mixing of the liquid fertilizer, or may be started from the time stored as the cleaning start time in the program of the controller 11.
One program may be changed.

[0021]

As described above, according to the present invention, not only the mixing of the chemical solution ratio but also the management of the chemical solution supply line such as the cleaning of the remaining chemical solution, the detection of the occurrence of abnormality and the cleaning process, etc. are performed automatically.
The following effects can be obtained.

(1) If stored in advance in the program of the control device, the cleaning can be automatically performed each time the supply of the chemical solution is completed, so that the residual chemical solution and dust adhering to the flow meter or the strainer of the chemical solution supply line can always be removed. It is less likely to occur. (2) If the occurrence of an abnormality can be constantly monitored, the detection of the abnormality can be quickly performed, and after the abnormality is detected, the washing is automatically performed. Therefore, it is possible to prevent a burden on a flow meter, a pump, and the like of the chemical supply line. As a result, such failures and damages are less likely to occur. (3) In particular, since the countermeasures against the occurrence of the abnormality are quick, a decrease in the accuracy of the dilution ratio is prevented, and stable operation can be continued. (4) It is not necessary to go to the installation site of the chemical solution mixing device only for cleaning as in the related art, and the work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an automatic liquid fertilizer mixing and irrigation apparatus using a chemical liquid mixing apparatus according to the first invention of the present invention.

FIG. 2 is a configuration diagram of an automatic liquid fertilizer mixing and irrigation apparatus using the chemical liquid mixing apparatus according to the second invention of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main pipe 2 ... Main pipe pump 3 ... Main pipe flow meter 4 ... Chemical liquid supply line 5 ... Check valve 6 ... Flow control valve 7 ... Chemical liquid flow meter 8 ... Chemical liquid pump 9 ... Strainer 10 ... Liquid fertilizer 10a ... Chemical liquid tank 11 ... Control device DESCRIPTION OF SYMBOLS 12 ... Setting device 13 ... Branch flow path 14 ... Automatic valve for washing water 15 ... Discharge flow path 16 ... Three-way switching valve 17 ... Branch pipe 18 ... On / off valve 19 ... Irrigation pipe 20 ... Water 20a ... Water source 21 ... Plant 22 ... Difference Pressure gauge 23 ... Discharge flow path 24 ... Automatic valve for drainage 25 ... Automatic valve for chemical liquid 30 ... Diluted water for liquid fertilizer 35 ... Washing water 50 ... Where to be washed 55 ... Connection point 77 ... Branch point

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 5-53455 (JP, U) JP-A 5-53454 (JP, U) JP-A 64-429 (JP, U) JP-A 64-64 9522 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01C 23/04 A01G 25/00-27/00

Claims (2)

(57) [Claims] 1. A main pipe flow meter is connected to a main pipe, and a chemical liquid supply line for mixing a chemical liquid is connected to the main pipe. A chemical liquid flow meter and a flow control valve are installed in the chemical liquid supply line. Provide a setter to input the ratio to the flow rate of the control device, in the chemical liquid mixing device that automatically adjusts the flow rate control valve so that the flow rate of the chemical liquid supply line is a predetermined ratio flow rate in the control device, A branch channel having an automatic valve for washing water connected to an appropriate portion of the main pipe is provided on the downstream side of the washing point of the chemical supply line, and a discharge passage is provided on the upstream side of the washing point. A chemical liquid mixing device, wherein a three-way switching valve is provided, and the automatic valve for washing water and the three-way switching valve are also controlled by the control device. 2. A main pipe flow meter is connected to the main pipe, and a chemical liquid supply line for mixing a chemical liquid is connected to the main pipe. A chemical liquid flow meter and a flow control valve are installed in the chemical liquid supply line. Provide a setter to input the ratio to the flow rate of the control device, in the chemical liquid mixing device that automatically adjusts the flow rate control valve so that the flow rate of the chemical liquid supply line is a predetermined ratio flow rate in the control device, A branch channel having an automatic valve for washing water connected to an appropriate portion of the main pipe is provided on the downstream side of the washing point of the chemical supply line, and a discharge passage is provided on the upstream side of the washing point. A branch point is provided, an automatic valve for chemical solution and an automatic valve for drainage are respectively provided in an upstream channel and a discharge channel of the branch point, and the automatic valve for water purification, the automatic valve for chemical solution, and the automatic valve for drainage are also provided. Being controlled by the control device Chemical contamination and wherein.