JPH1176906A - Liquid chemical mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid chemical mixing device capable of diluting.mixing the liquid chemical and a diluent water in a prescribed ratio by a small-sized and simple constitution. SOLUTION: In the liquid chemical mixing device 1, liquid chemical tanks 2 and 3 respectively storing the liquid chemical A and the liquid chemical B, a forcibly feeding pump 4 sucking up the liquid chemicals A and B and the diluent water, a cock 8 interrupting or communicating a discharging port 6 of the forcibly feeding pump 4 and a spray nozzle 7, suction passages 9 and 10 communicating the liquid chemical tanks 2 and 3 and a suction port 5 of the forcibly feeding pump 4, a water suction passage 11 communicating the suction port 5 of the forcibly feeding pump 4 and a water source of the diluent water W, a flowing back passage 12 communicating the discharging port 6 and the suction port 5 of the forcibly feeding pump 4 and a relief valve 14 communicating the flowing back passage 12 by opening a valve when the cock 8 is opened and interrupting the flowing back passage 12 by closing the valve when the cock 8 is closed in a driving state of the forcibly feeding pump 4 are provided, and a first orifice 20 having an opening diameter of D1 is provided in the water suction passage 11 and second orifices 21 and 22 respectively having the opening diameter of D2 and D3 are provided in the liquid suction passages 9 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid mixing apparatus used for diluting and mixing a chemical sprayed on a field or injected into soil with a diluent such as water.

[0002]

2. Description of the Related Art Heretofore, when spraying pesticides, a chemical solution preparation tank is prepared in advance, and a chemical solution and another liquid such as water are diluted and mixed in the chemical solution preparation tank. Was pumped up by a pressure pump and supplied to a spray nozzle or an underground injector for use. In the above-mentioned use mode, a relatively large-capacity chemical solution preparation tank used for a spray nozzle or a soil injector is required, and a large site must be secured on a ridge or the like. In addition, when the mixed solution in the chemical solution preparation tank reaches the bottom during the spraying or the like, the spraying operation must be temporarily interrupted to prepare the mixed solution again, and the workability deteriorates. Also, when multiple types of chemicals are used in combination, if the time is too long after dilution and mixing in the chemical preparation tank,
The efficacy of these drugs may be reduced.

Therefore, the present inventor has developed a chemical solution mixer for solving the above-mentioned problems, and has filed a patent application (Japanese Unexamined Patent Publication No.
317327). This chemical mixer forms a chemical supply path and a chemical return path branched from the casing in the casing, connects the chemical inlet of the chemical supply path to the chemical tank, and connects the chemical outlet of the chemical supply path to the suction port of the pressure pump. The chemical liquid return path is connected to the chemical liquid tank, and the chemical liquid supply path and the chemical liquid return path are selectively opened / closed by a valve element operated by the discharge port pressure of the pressure pump. Has become. In the chemical liquid mixing apparatus using this chemical liquid mixer, a dilution water supply path is directly connected to the suction port of the pressure feed pump, and a chemical liquid supply pump is provided in the chemical liquid supply path. When the spraying is stopped while the pump is being driven, the liquid supply path of the liquid mixer is closed and the liquid return path is opened, and the liquid supply path is opened and the liquid return path is closed during distribution. It has become. Such a chemical mixing apparatus has an advantage that the chemical can be diluted and mixed immediately before use such as spraying.

[0004]

However, the chemical mixing apparatus disclosed in the above publication requires a plurality of pumps such as a pressure pump and a chemical supply pump, and the mixing ratio of the chemical and the dilution water is provided in the chemical supply path. It is necessary to adjust and set the amount of chemical solution supplied by the flow control valve provided. Therefore, the device is large and complicated, and the manufacturing cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a small size and a simple structure, and is capable of diluting and mixing a chemical solution and dilution water at a desired ratio. The purpose is to provide.

[0006]

In order to achieve the above object, a chemical solution mixing device according to the present invention comprises a chemical solution tank storing a chemical solution, a pressure pump for pumping the chemical solution and its dilution water, and a discharge port of the pressure pump. A cock that connects or disconnects the discharge port and the outside, a liquid suction path that connects the chemical liquid tank with the suction port of the pressure pump, and a suction port of the pressure pump that is arranged in parallel with the liquid suction path. A suction passage communicating the water with the water source of the dilution water, a return line communicating the discharge port and the suction port of the pressure pump, and a return line interposed therebetween, are opened when the cock is closed while the pressure pump is being driven. A relief valve for closing the valve when the cock is opened by closing the cock when the valve is connected to the return path, and a first orifice is provided in the water suction path and a second orifice is provided in the liquid suction path. With the opening diameter of the first orifice And the opening diameter of the second orifice, are a configuration set respectively depending on the intended mixing ratio of the chemical liquid and dilution water.

[0007] In addition to the above configuration, the valve opens when the discharge port pressure of the pressure pump becomes higher than the first predetermined pressure, and closes when the discharge port pressure becomes lower than the first predetermined pressure. The pressure reducing stop valve to be valved is interposed in the liquid suction path.

Further, in addition to the above-mentioned respective structures, the valve is opened when the pressure in the return passage becomes lower than a second predetermined pressure, and is opened when the pressure in the return passage becomes higher than the second predetermined pressure. The pressure reducing valve is closed in the suction path.

As the chemical liquid tank in each of the above configurations, a liquid tank that is formed in a hollow container that can float in dilution water while containing a chemical liquid and that is used while floating in a water source of dilution water may be adopted.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1. FIG. 1 is a piping diagram showing a chemical mixing apparatus according to one embodiment of the present invention. In the figure, a chemical mixing device 1 comprises a chemical tank 2 storing a chemical A and a chemical B
, A pump 3 for pumping chemicals A and B and their dilution water W;
Liquid passages 9 and 1 that communicate the suction port 3 with the suction port 5 of the pressure pump 4.
0 and the pressure pump 4 arranged in parallel with the suction paths 9 and 10.
Water passage 11 which communicates the suction port 5 of the water and the water source of the dilution water W.
And a return path 12 that communicates the discharge port 6 and the suction port 5 of the pressure pump 4.

An accumulator 24 and a pressure gauge 25 are connected to a discharge pipe 6a provided at the discharge port 6 of the pressure feed pump 4. A cock 8 is provided at the tip of the discharge pipe 6a.
The spray nozzle 7 is connected to the cock 8 as an external device. Suction port 5 of pressure feed pump 4
A negative pressure gauge 26 is provided in the vicinity. In addition, a relief valve 14 that opens and communicates with the recirculation path 12 when the cock 8 is closed while the pump 8 is driven, and closes and shuts off the recirculation path 12 when the cock 8 is opened. Is interposed. A pressure reducing stop valve 1 that opens and closes based on the pressure at the discharge port 6 of the pressure pump 4 is provided in the liquid suction passages 9 and 10.
7A and 17B are interposed. Pressure reducing stop valve 17
The pressure guiding passage 13 connected to A and 17B is connected to the discharge pipe 6a, and a cock 23 is provided in the pressure guiding passage 13 as well. Downstream of the relief valve 14 of the return path 12, pressure reducing valves 15 A, 1 that shut off the liquid suction paths 9, 10 when the pressure at the time of return is reached.
5B, and a flow control valve 19 for adjusting the reflux amount of the mixed liquid of the chemicals A and B and the dilution water W is provided. still,
The water source of the dilution water W may be water stored in a vehicle-mounted 500-liter tank or the like, or may be water for agricultural use in fields and rivers.

In particular, in this chemical liquid mixing apparatus 1, the water absorption passage 1
1, a first orifice 20 is provided, and liquid suction passages 9 and 10 are provided.
The inside is provided with second orifices 21 and 22. In this case, the opening diameter D ₁ of the first orifice 20 (D ₁ = 5.
6 mmφ), the opening diameter D of the second orifice 21
₂ (D ₂ = 0.8 mmφ) (or second orifice 22
The opening diameter D ₃ (D ₃ = 0.8 mmφ) is set according to the desired mixing ratio BR (for example, BR = 1/49) between the chemical solution A (or the chemical solution B) and the dilution water W. .

As shown in FIG. 2, a relief valve 14 is provided in a casing 40 with a pressure guiding passage 46 connected to the discharge pipe 6a of the pressure feed pump 4 via a recirculating passage 12, and a pressure guiding passage 46. The housing space such as the piston 41 and the outlet side passage 45 are formed so as to be orthogonal to. A valve element 48 is fixed to the upper end of the piston 41 with a screw 49 so as to open and close a valve seat 47 below the outlet passage 45. The piston 41 is movably disposed in the accommodation space, and is constantly urged toward the valve seat 47 by the coil spring 42 provided therein. The biasing force of the coil spring 42 is adjusted by moving the receiving seat 43 up and down with a thumb screw 44 screwed into a lower portion of the casing 40. In this case, when the pressure in the pressure guiding passage 46 becomes 25 kg / cm ² ,
The urging force of the coil spring 42 is adjusted such that the piston 41 is pushed into the housing space.

Further, as shown in FIG. 3, the integral valve 16 has a single casing 60 in which a pressure reducing valve 15A and a pressure reducing valve 15B are integrally formed. First, the pressure reducing valve 15
A is a pressure guiding passage 6 communicating with the outlet side passage 45 of the relief valve 14.
6 is provided through the inside of the casing 60. A space for accommodating the piston 61A and the coil spring 62A is formed so as to be orthogonally branched from the pressure guide path 66. Piston 61A
Is fitted with one end of a valve shaft 63A. Valve shaft 63
The other end of A faces an entrance side passage 65A formed separately from the above-mentioned accommodation space, and a valve body 68A is fixed to a tip end of a valve shaft 63A. An O-ring 67A is provided at a lower portion of the entrance-side passage 65A, and the valve body 68A comes into close contact with and separates from the O-ring 67A, so that the liquid suction passage 9A is provided.
The outlet passage 64A connected to the inlet passage 65A and the entrance passage 65A are cut off and communicated with each other. On the other hand, pressure reducing valve 1
The piston 61B, the coil spring 62B, the valve shaft 63B, the outlet passage 64B, the inlet passage 65B, the O-ring 67B, and the valve body 68B that constitute the 5B are configured similarly to the elements of the pressure reducing valve 15A. In this case, when the pressure in the pressure guiding path 66 exceeds, for example, about 5 kg / cm ² (the pressure at the time of reflux and corresponds to the second predetermined pressure), the pistons 61A and 61B are pushed into the respective accommodation spaces. The valve body 68A, 68
The biasing force of the coil springs 62A and 62B is set so that B is closed.

As shown in FIG. 4, the integral type valve 18 uses a single casing 70 to reduce the pressure of the pressure reducing stop valve 17.
A and the pressure reducing stop valve 17B are integrally formed.
First, in the pressure reducing stop valve 17A, a pressure guiding path 76 communicating with the pressure guiding path 13 from the discharge pipe 6a is provided across the inside of the casing 70. A space for accommodating the piston 71A and the coil spring 72A is formed so as to be orthogonally branched from the pressure guiding path 76. One end of a valve shaft 73A is attached to the piston 71A. The other end of the valve shaft 73A faces an entrance-side passage 74A formed separately from the housing space, and a valve body 78A is fixedly provided at the tip of the valve shaft 73A.
An O-ring 77A is provided above the inlet passage 74A. The valve body 78A comes into close contact with and separates from the O-ring 77A, so that the outlet passage 75 connected to the liquid suction passage 9 is provided.
A and the above-mentioned entrance side passage 74A are cut off and communicated. A piston 71B, a coil spring 72B, a valve shaft 73B, an inlet passage 74 constituting the pressure reducing stop valve 17B.
B, outlet side passage 75B, O-ring 77B, valve body 78B,
The configuration is the same as that of the pressure reducing stop valve 17A.
In this case, when the pressure in the pressure guiding path 76 becomes higher than about 5 kg / cm ² (corresponding to the first predetermined pressure), the piston 7
The coil springs 72A, 7B are pushed so that the valve bodies 1A, 71B are pushed into the respective accommodating spaces to open the valve bodies 78A, 78B.
The urging force of 2B is set.

As shown in FIG. 5, the flow control valve 19 has an orifice 82 attached to one end of an L-shaped passage formed in a casing 80, and an orifice opening 84 (opening diameter = A tapered valve shaft 83 is provided in the L-shaped passage so as to increase or decrease the diameter of the valve shaft 3 mmφ). An adjustment knob 81 screwed to the outer surface of the casing 80 is attached to the other end of the valve shaft 83. By rotating the adjustment knob 81, the valve shaft 83 moves forward and backward,
The outlet passage 85 connected to the suction port 6 and the orifice opening 8
4 and the flow rate of the diluting water W and the chemicals A and B are adjusted. The orifice 82 is held by attaching the casing 80 to the socket 50 of the pressure reducing valve 15B indicated by a two-dot chain line.

The operation of diluting and mixing the chemicals A and B by the chemical mixing device 1 will be described below. Here, a case where an acidic aqueous solution is used as the chemical solution A and an alkaline aqueous solution is used as the chemical solution B is exemplified. First, after bleeding air from all the passages of the chemical liquid mixing device 1, the pressure feed pump 4 is started. Then, open the cock 8 and spray nozzle 7
In the state in which the dilution water W is sprayed, the discharge amount of the pressure feed pump 4 is adjusted by, for example, the engine speed, and the discharge pipe 6a,
20k inside the recirculation path 12 to the relief valve 14 and the pressure guide path 13
The pressure is maintained at about g / cm ² . Then, when the cock 8 is closed, the pressure on the discharge side of the pressure feed pump 4 temporarily becomes 25 k.
g / cm ² . Then, the valve element 48 of the relief valve 14 opens, and the pressure on the discharge side of the pressure feed pump 4 becomes 15 to 1
Drops to 8 kg / cm ² . In this way, the dilution water W on the discharge side of the pressure pump 4 passes through the recirculation path 12 and the relief valve 14,
It returns to the suction side of the pressure feed pump 4 via the pressure reducing valves 15A, 15B and the flow regulating valve 19.

At this time, chattering which is likely to occur in the relief valve 14 can be prevented by the flow regulating valve 19 provided downstream of the relief valve 14, and the inside of the discharge pipe 6a, the recirculation path 12, and the pressure guiding path 13 are prevented. It is stably maintained at 15 to 18 kg / cm ² . As a result, the liquid suction passages 9 and 10 are reliably closed, and the mixing of the chemicals A and B can be prevented. still,
The amount of circulation passing through the flow control valve 19 is previously adjusted by the adjustment knob 81 so as to be equal to the amount of spray from the spray nozzle 7.

On the other hand, the pressure reducing stop valves 17A and 17B also act on the respective valve bodies 78A and 78
8B is opened and the pressure reducing valves 15A, 15
The liquid suction passages 9 and 10 to B are communicated. On the other hand, pressure reducing valve 1
5A and 15B, the valve bodies 68A and 68B are closed during the reflux state. Then, when the cock 8 is opened to make a normal spray state, the relief valve 14 is closed, and the pressure reducing valves 15A, 15B
Are opened. Thereby, the liquid suction paths 9 and 10 communicate with each other. Therefore, water absorption channel 1
1, the dilution water W is sucked up, and the chemicals A and B are sucked up from the liquid suction passages 9 and 10. These are merged and mixed on the suction side of the pressure feed pump 4 and then sprayed through the discharge pipe 6a. It is sprayed from 7 into fields. At this time, the amount of water supplied by the pressure pump 4 is about 10 l / min, and the negative pressure at the suction port 5 is about -40 cmHg.

In this case, the mixing ratio BR between the chemicals A and B and the dilution water W is determined by the opening diameter D ₁ of the first orifice 20 and the opening diameter D ₂ (or D ₃ ) of the second orifice 21 (or 22). Are set by the ratio of
B is 1 liter, and dilution water W is 49 liters, each of which is 1/49. In general, a medicine is handled in a 10-liter container, and the capacity of a water tank that can be mounted on a carrier of a light truck is 500 liters.

When the cock 8 is closed to stop the spraying, the relief valve 14 is opened and the pressure reducing valves 15A, 15B open the suction passages 9, 10 in the same manner as in the above-mentioned initial operation.
Is shut off. In this case, the liquid mixture discharged from the pressure feed pump 4 only circulates through the reflux path 12, and the chemicals A and B
Is stopped by the pressure reducing valves 15A and 15B and cannot be sucked up.

When the pump is stopped, the pressure reducing stop valve 1
Since the liquid suction passages 9 and 10 are shut off by 7A and 17B, it is possible to prevent adverse effects such that different types of chemicals and dilution water flow backward through the liquid suction passages 9 and 10 and flow into the chemical liquid tank. Therefore,
For example, it is suitable for a case where driving and stopping of the pressure feed pump are repeated when spraying periodically by a timer in a greenhouse.

On the other hand, once the pressure feed pump 4 is stopped,
When the cock 23 is closed after confirming that the pressure of 3 has disappeared, the pressure reducing stop valves 17A and 17B close the liquid suction passages 9 and 10, so that only the dilution water W is sprayed for ordinary watering. Can be. That is, in the chemical liquid mixing device 1, the sucked medicine and dilution water are all discharged, and are not returned to the medicine tank or the water source. Therefore, the drug is kept as it is, and the water source of the dilution water is not contaminated.

As described above, according to the chemical mixing apparatus 1 of this embodiment, the chemical A or the chemical B can be diluted and mixed immediately before spraying. Incidentally, if the chemical solution A (acidic aqueous solution) and the chemical solution B (alkaline aqueous solution) are mixed and left to stand, the medicinal effect may be remarkably reduced. It can be used without. In addition, the mixing ratio of the chemical solution and the dilution water can be set by an orifice having a simple structure, and a diluent having a desired mixing ratio can be obtained by a simple operation such as appropriately replacing the orifice with a different opening diameter. . Also, when the pump 4 is stopped,
When the hose is damaged, when the pressure guide path 13 is closed by the cock 23, etc., the pressure reducing stop valves 17A and 17B are connected to the liquid suction paths 9 and 10.
When the spraying is stopped while the pressure pump 4 is driven, the pressure reducing valves 15A and 15B block the suction paths 9 and 10, respectively, so that the other chemical solution or the diluting water W flows into the chemical solution tanks 2 and 3. You can stop doing that.

[Embodiment 2. In the above description, the chemical liquid tanks A and B, which can be placed on a light truck bed or the like, have been exemplified as the chemical liquid tanks, but the present invention is not limited thereto, and the chemical liquid tank 2a (3a) shown in FIG. 6 can be used. The chemical liquid tank 2a is made of, for example, polyethylene and is molded into a hollow container that can float on the dilution water W while containing the chemical liquid A, and is used by floating in a water source of the dilution water W. . The chemical solution tank 3a for storing the chemical solution B can be similarly configured. When the chemical liquid tanks 2a and 3a are used, the liquid level of the dilution water W and the chemical liquid A or the chemical liquid B does not open during use, so that the mixing ratio BR can be kept constant.

[Embodiment 3] 7 and 8
FIG. 1 shows an embodiment in which the present invention is most simply configured. In each figure, a chemical solution mixing device 1A includes a chemical solution tank 2 storing one type of chemical solution C, a pressure pump 4 for pumping the dilution water W stored in a water tank 30 and the above-described chemical solution C, and a discharge pump 4 A cock 8 that shuts off or communicates the outlet 6 and the spray nozzle 7, a chemical solution tank 2, and a suction port 5 of a pressure pump 4.
, A water suction path 11 that communicates the suction port 5 of the pressure pump 4 with the inside of the water tank 30, and a pressure pump 4
A recirculation path 12 communicating the discharge port 6 and the suction port 5 is opened when the cock 8 is closed while the pressure pump 4 is driven, and is closed when the cock 8 is opened when the cock 8 is opened. A relief valve 14 for shutting off the recirculation passage 12, a flow control valve 19 for adjusting the recirculation amount of the chemical solution C and the dilution water W, and a pressure reducing valve 15A which is a part of the integrated valve 16 shown in FIG.
And a pressure reducing stop valve 17A which is a part of the integrated valve 18 shown in FIG. Further, a first orifice 20 is provided in the water suction passage 11, and a second orifice 21 is provided in the liquid suction passage 9. 31 is a pressure feed pump 4
The air vent valve provided at the discharge port 6 of the water intake passage 1
A strainer 33 provided at the end of the water tank 30
Is a small cleaner provided at the end of the liquid suction path 9 on the side of the chemical liquid tank 2. Therefore, the chemical liquid mixing device 1A of this embodiment
Thus, for example, a simple configuration is used in which the chemical C is simply diluted with the dilution water W. That is, the opening diameter of the first orifice 20 and the opening diameter of the second orifice 21 are set in accordance with the desired mixing ratio of the chemical solution C and the dilution water W, respectively. It can be mixed in the ratio of the period.

[Embodiment 4. On the other hand, as shown in FIG. 9, the present invention can also be applied to a case where, for example, chemicals A and B are diluted with primary diluting water W in advance and further diluted with a large amount of diluting water W. In this case, the chemical solution mixing device 1a is different from the above-described configuration of the chemical solution mixing device 1 in that the pressure reducing stop valve 27A that communicates and shuts off the water suction passage 11A for the dilution water W for primary dilution of the chemical solution A, and the chemical solution B Water absorption channel 1 for dilution water W for primary dilution
A pressure reducing stop valve 27B for communicating and shutting off the pressure reducing valve 1B is provided, and the pressure reducing valves 15A, 15B corresponding to the pressure reducing stop valves 17A, 27A or the pressure reducing stop valves 17B, 27B are provided.
And the integral valve 16 is attached 1 group consisting 5B, a pressure reducing stop valve 17A exit side of the liquid absorbing passage opening diameter D ₄ of the orifice 28 provided in the 9, decompression stop valve 27A outlet side of the water passage 11A orifice 29 of the opening diameter D ₅ provided
An orifice 30 having an opening diameter D ₆ provided in the liquid suction passage 10 on the outlet side of the pressure reducing stop valve 17B;
It is that it comprises an orifice 31 of the opening diameter D ₇ provided on B outlet side of the water passage 11B.

In the chemical liquid mixing apparatus 1a having such a configuration, when the chemical liquids A and B are highly viscous or when there is a possibility that a problem may occur if the liquids are mixed at a high concentration, the liquids A and B are each prepared before the mixing. Since the mixture can be diluted, the mixing ratio is less likely to vary, and problems due to mixing of the undiluted solution can be prevented.

Of course, the above-mentioned chemical liquid mixing devices 1A and 1a can also use the chemical liquid tanks 2a and 3a that can float on the dilution water W while containing the chemical liquids A, B and C. Further, in each of the above-described embodiments, an example of diluting and mixing two types of chemicals A and B and an example of diluting one type of chemical C are described. However, the present invention dilutes and mixes three or more types of chemicals. Needless to say, the configuration can be made such that

[0030]

As described above, according to the chemical liquid mixing apparatus of the present invention, since the first and second orifices having simple structures are used, a small and simple configuration is required. In addition, by setting the opening diameter of the first orifice and the opening diameter of the second orifice according to the desired mixing ratio of the chemical and the dilution water, the chemical and the dilution water can be mixed at the desired ratio. .

When the pressure at the discharge port of the pressure pump becomes lower than the first predetermined pressure, for example, when the pressure pump is stopped or the hose is broken, the pressure reduction stop valve shuts off the liquid suction passage. It can be prevented that water or a mixed solution after dilution is mixed in, or a chemical solution flows into a water source of the dilution water and is contaminated.

Further, since the pressure reducing valve which closes when the pressure in the recirculation passage exceeds the second predetermined pressure is interposed in the liquid suction passage, the cock is closed while the pump is driven to stop spraying. In such a case, the pressure reducing valve shuts off the liquid suction passage. Therefore, also in such a case, it is possible to prevent the dilution liquid or the mixed liquid after dilution from being mixed into the chemical liquid tank, or prevent the chemical liquid from flowing into the water source of the dilution water and being contaminated.

When a hollow container capable of floating on the water source of the dilution water is used as the chemical liquid tank, the difference between the liquid levels of the dilution water and the chemical liquid hardly changes during use, so that a constant mixing ratio is used. The retained mixture can be obtained.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a chemical mixing device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a relief valve used in the chemical solution mixing device.

FIG. 3 is a cross-sectional view showing a pressure reducing valve used in the chemical solution mixing device.

FIG. 4 is a cross-sectional view showing a pressure reducing stop valve used in the chemical solution mixing device.

FIG. 5 is a cross-sectional view showing a flow control valve used in the chemical solution mixing device.

FIG. 6 is a cross-sectional view showing another example of a chemical solution tank used in the chemical solution mixing device.

FIG. 7 is a piping diagram showing a chemical solution mixing apparatus according to another embodiment of the present invention.

FIG. 8 is a sectional view taken along line AA in FIG. 7;

FIG. 9 is a piping diagram showing a chemical mixing apparatus according to yet another embodiment of the present invention.

[Explanation of symbols]

1,1A, 1a Chemical liquid mixing device 2,2a, 3,3a Chemical liquid tank 4 Pressure pump 5 Suction port 6 Discharge port 8 Cock 9,10 Suction path 11 Suction path 12 Reflux path 14 Release valve 15A, 15B Pressure reducing valve 17A, 17B decompression stop valve 20 first orifice 21, 22 second orifice 30 water tank A, B, C chemical D _1, D _2, D ₃ opening diameter W of dilution water

Claims (4)

[Claims] 1. A chemical solution tank storing a chemical solution, a pump for pumping the chemical solution and its dilution water, a cock connected to a discharge port of the pressure pump, for shutting off or communicating the discharge port with the outside, and a chemical solution tank. A suction passage communicating between the suction pump and the suction port of the pressure pump, a suction passage arranged in parallel with the suction passage and communicating the suction port of the pressure pump with the water source of the dilution water, a discharge port and a suction port of the pressure pump. And a return path that communicates with the pump.The valve is opened when the cock is closed and the return path is connected when the cock is opened while the pump is driven. A first orifice in the water suction passage, a second orifice in the liquid suction passage, and a dilution of the opening diameter of the first orifice and the opening diameter of the second orifice with the chemical solution. Depending on the desired mixing ratio of the water A chemical mixing device characterized by being set. 2. A pressure reducing stop valve, which opens when the discharge port pressure of the pressure pump becomes higher than a first predetermined pressure and closes when the discharge port pressure becomes lower than the first predetermined pressure. The chemical liquid mixing device according to claim 1, wherein the chemical liquid mixing device is interposed in a liquid passage. 3. A pressure reducing valve that opens when the pressure in the return path becomes lower than a second predetermined pressure and closes when the pressure in the return path becomes higher than the second predetermined pressure. 3. The chemical mixing device according to claim 1, wherein the chemical mixing device is interposed in a liquid passage. 4. The liquid chemical tank according to claim 1, wherein the liquid chemical tank is formed in a hollow container that can float on the dilution water while containing the liquid chemical, and is used while floating on a water source of the dilution water. A drug solution mixing device according to any one of the above.