JPH01320913A - Apparatus for mixing liquid chemicals - Google Patents

Abstract

PURPOSE:To perform uniform mixing of liquid chemicals using an apparatus having compact overall size by mixing the chemicals in a pressure feed pump. CONSTITUTION:Liquid in a liquid reservoir tank 2 is supplied to a check valve 20 under pressure with a pressure feed pump 4. At the same time, slurry in a slurry tank 9 is introduced into a liquid feeding line 6 with a liquid chemical feeding pump 11. The liquid is mixed with the slurry in the feeding line and ejected from an ejector 7. The pressure in the liquid feeding line 6 is low at the time of ejection. The pressure in the line increases upon the stop of the ejection and, when the pressure of the side of pressure feed pump 4 is high, the mixing of the slurry and the liquid is inhibited by a check valve 24. When the pressure is high at the side of the liquid chemical feeding pump 11, the check valve 20 is closed. A large-sized cistern is unnecessary because the mixing in the pressure feed pump is carried out under the control with the pressure. There is no separation of the liquid chemical and water in the cistern.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is particularly applicable to spreading liquid fertilizer on a vegetable garden or injecting liquid fertilizer into the ground by mixing a muddy slurry containing solid lumps with a liquid. This relates to a chemical liquid mixer that is sometimes used.

(Prior art) Conventionally, when applying slurry-like fertilizer containing solid lumps and liquid fertilizer at the same time, the chemical solution and liquid such as water are mixed in a predetermined ratio in a distern and stored in advance. The medicinal solution is sucked up by a pressure pump, pressurized, and supplied to a sprayer or syringe for use.

(Problems to be Solved by the Invention) First of all, the above-mentioned conventional device requires a large cistern to store a sufficient amount of mixed chemical solution for spraying or injecting, making the entire device large. To put away.

Second, when a large amount of mixed chemical solution is prepared at once and stored in the distern, there is a disadvantage that it is easy to separate within the distern due to the difference in specific gravity between the medicinal solution and water, so to prevent such separation, a stirrer is usually installed in the distern. However, this not only complicates the structure, but also increases the initial cost and running cost.

Thirdly, if the mixed chemical solution that has been mixed cannot cover the entire amount, do not mix the shortage further (in such a case, the blended ratio will be exactly the same as the mixing ratio of the previous mixed chemical solution). Therefore, if the mixing ratio is different, uniform spraying or injection of the chemical solution will not be possible.

Fourth, if there is a surplus of the mixed chemical solution that has been prepared, a large space is required if the mixed chemical solution is stored in a cistern, for example, and if it is disposed of by spreading it on the surrounding ground or sewage, etc., it causes pollution. This may cause problems. This problem is especially noticeable when the mixed chemical solution to be sprayed or injected is an insecticide or herbicide.

Fifth, after the spraying or injection work is completed, the inside of the cistern that stores the mixed chemical solution must be cleaned, which requires a lot of time and effort, and the mixed chemical solution that remains in the cistern. There is a risk that the worker may inhale the chemical or the chemical may adhere to the worker, and this poses a hygiene problem, especially when the mixed chemical is a herbicide or insecticide.

The present invention has been proposed in view of the above-mentioned problems, and it is possible to maintain a constant mixing ratio of liquid fertilizer to be sprayed or injected without increasing the size of the entire device, and to easily dispose of surplus chemical liquid. The purpose of this invention is to provide a mixer.

(Means for Solving the Problem) In order to achieve the above object, the chemical liquid mixer according to the present invention has the following features:
A backflow prevention valve is provided in the liquid supply path where the liquid in the liquid storage tank is sucked by a pressure pump and fed to the injection device, and the slurry in the slurry tank is sucked by the chemical solution supply pump and then from the backflow prevention valve in the chemical solution supply path. A slurry supply path is formed so as to supply the slurry under pressure to the downstream portion, a check valve is provided at the confluence of the liquid supply path and the slurry supply path, and a reflux path is formed from an intermediate portion of the slurry supply path to the inside of the slurry tank. The present invention is characterized in that an on-off valve for opening and closing the flow path is interposed in the reflux path, and the on-off valve is controlled by the pressure on the discharge side of the chemical solution supply pump.

(Function) First, when the pressure pump and the chemical supply pump are driven,
By driving the pressure pump, the liquid in the liquid storage tank is pumped and supplied from the check valve to the liquid supply path.At the same time, by driving the chemical liquid supply pump, the slurry in the slurry tank passes through the slurry supply path and check valve, and becomes liquid. The liquid enters the supply path, is mixed with the liquid supplied from the liquid storage tank, is supplied to the injection device, and is injected.

The pressure in the liquid supply path near the injection device when the injection device is injecting in this way is relatively low, and therefore the on-off valve of the return path is kept closed.

Next, when the injection device is stopped with the pressure pump and the chemical liquid supply pump being driven, the pressure in the liquid supply path near the injection device immediately increases.

Therefore, when the discharge pressure of the pressure pump is higher than the discharge pressure of the chemical liquid supply pump, the check valve first cuts off communication between the slurry supply path and the liquid supply path, and the liquid discharged from the pressure pump flows into the slurry supply path. is prevented. Then, as the pressure in the slurry supply passage increases, the opening/closing control mechanism opens the opening/closing valve, so that the slurry discharged from the chemical supply pump is returned from the slurry supply passage through the reflux passage and into the slurry tank.

In addition, when the discharge pressure of the chemical solution supply pump is higher than the discharge pressure of the pressure pump, the check valve is first closed to prevent the slurry discharged from the chemical solution supply pump from flowing back to the pressure pump side. Similarly, as the pressure in the slurry supply path increases, the on-off control mechanism opens the on-off valve, and the slurry discharged from the chemical supply pump is refluxed from the slurry supply path through the reflux path and into the slurry tank. be.

(Example) Hereinafter, an example of the chemical liquid mixer according to the present invention will be described based on the drawings.

FIG. 1 shows a schematic diagram of a state in which a chemical liquid mixer is incorporated into a chemical liquid spraying device, and reference numeral 1 indicates the chemical liquid spraying device as a whole.

This chemical spray device 1 has a water storage tank (liquid storage tank)
Water 3 stored in 2 is sucked by a pressure pump 4 driven by a drive means not shown, and is supplied under pressure to a spray nozzle (injection device) 7 via a liquid supply path 6 formed inside a mixer 5. The slurry chemical solution 10 containing solid lumps in the slurry tank 9 is sucked by the chemical solution supply pump 11 which is driven in conjunction with the pressure pump 4, and the slurry supply channel 12 and a slurry supply path 13 that supplies the slurry to the liquid supply path 6 formed inside the mixer 5 through the slurry.

The chemical liquid mixer 5 in which the liquid supply path 6 and the slurry supply path 12 are formed has a liquid population 15 protruding from one side of the lower half of the casing 14 formed in a substantially cylindrical shape, and a liquid outlet at the lower end surface. 16 is opened, and an "L"-shaped liquid supply path 6 is formed between the liquid port 15 and the liquid outlet 16, and the liquid in the casing 14 is supplied from the slurry port 16 that opens at the upper end of the casing 14. A slurry supply path 12 is formed in a straight line so as to communicate with the supply path 6.

A liquid supply path 6 protrudes to the side of the casing 14.
A check valve 20 is provided in which a valve body 18 is urged toward the valve seat 19 side by a spring 17, and a ball valve body 22 is provided in a communication portion between the liquid supply path 6 and the slurry supply path 12 by a spring 21. A check valve 24 is provided which is biased toward the valve seat 23 side.

Note that the elastic force of the spring 17 of the check valve 20 and the elastic force of the spring 21 of the check valve 24 are approximately the same strength.

In addition, the slurry supply path 12 formed in the casing 14
A reflux path 25 is formed which branches from the middle portion thereof and communicates with the slurry tank 9, and an on-off valve 29 which is controlled to open and close by an opening/closing control mechanism 28 is disposed in the middle of the reflux path 25.

The opening/closing control mechanism 28 intersects the slurry supply path 12 orthogonally, and a control mechanism forming sleeve 30 is provided concentrically with the return path 25.
A piston 31 is provided that slides airtightly on the control mechanism forming sleeve 30, and a pressure regulating spring 33 whose tension is adjusted from the outside with an operating pressure regulating screw 32 is provided on the piston 31. The valve body 37 is connected to the valve body 37 of No. 29 by a valve shaft 35, and the valve body 37 is pressed against the valve seat 36.

Here, the elastic force of the pressure regulating spring 33 of the opening/closing mechanism is
It is stronger than the elastic force of 1.

Reference numeral 40 in the figure is a flow rate control valve that adjusts the amount of slurry 10 discharged from the chemical liquid supply pump 11, and as in this embodiment, the chemical liquid supply pump 11 is driven in conjunction with the pressure pump 4. The flow rate control valve 4o may be omitted in the case where the flow rate control valve 4o is configured as shown in FIG.

Further, reference numeral 41 in the figure is a bypass that returns the water 3 discharged from the pressure pump 4 to the liquid storage tank 2 when the pressure on the side of the discharge port 43 of the pressure pump 4 is high, and the pressure of the liquid returned by the bypass 41 is It is set by the relief setting pressure of the relief valve 42.

The operation of the chemical liquid spraying device 1 configured as described above will be explained next.

First, when the pressure pump 4 and the chemical solution supply pump 11 are driven, the water 3 in the liquid storage tank 2 is forced and supplied from the backflow prevention valve 20 to the liquid supply path 6 by driving the pressure pump 4 .

At the same time, the slurry 10 in the slurry tank 9 passes through the slurry supply path 12 and the check valve 24 and enters the liquid supply path 6 by driving the chemical liquid supply pump 11, where it mixes with the water 3 supplied from the liquid storage tank 2. The fuel is supplied to the injection device 7 and injected.

The pressure in the liquid supply path 8 when the injection device 7 is injecting in this way is relatively low, and therefore the opening/closing control mechanism 2
8 is not operated, and the on-off valve 29 of the reflux path 25 is kept closed.

Next, when the injection device 7 is stopped with the pressure pump 4 and the chemical liquid supply pump 11 being driven, the pressure in the liquid supply path 8 near the injection device 7 is immediately increased, and the discharge pressure of the pressure pump 4 is increased. When the discharge pressure is higher than the discharge pressure of the chemical liquid supply pump 11, the check valve 24 first closes the slurry supply path 6 and the liquid supply path 1.
2, and the liquid discharged from the pressure pump 4 is prevented from flowing into the slurry supply path 12.

As the pressure in the slurry supply path 12 increases, the piston 34 of the opening/closing side '4n mechanism 28 slides to the left in the figure against the tension of the pressure regulating spring 33, and the opening/closing valve 29 is opened, so that the chemical solution is supplied. The slurry 10 discharged from the pump 11 flows back into the slurry tank 9 from the slurry supply path 12 through the reflux path 25.

Further, when the discharge pressure of the chemical solution supply pump 11 is higher than the discharge pressure of the pressure pump 4, the check valve 20 is closed to prevent the slurry 10 discharged from the chemical solution supply pump 11 from flowing back to the pressure pump 4 side. After that, as described above, as the pressure in the slurry supply path 12 increases, the on-off valve 29 is opened by the on-off control mechanism 28, and the chemical solution supply pump 11 is opened.
The slurry 10 discharged from the slurry supply path 12 is refluxed to the slurry tank 9 through the reflux path 25.

In the above embodiment, the chemical liquid mixer 5 is incorporated into the power spraying device 7, but it goes without saying that it is not limited to this and can also be incorporated into, for example, an injection device for fertilizing underground. .

(Effects of the Invention) As explained above, the chemical mixer according to the present invention is controlled by the chemical mixer immediately before being sprayed or injected, and is mixed in the pressure pump section. There is no need for a large cistern to store a sufficient amount of mixed chemicals for such spraying or injection, and the entire device can be made compact.

Next, the mixed chemical solution is controlled by the chemical mixer and mixed in the pressure pump section just before being sprayed or injected, so that the chemical solution and the water There is no separation within the distern due to the difference in specific gravity, and uniform spraying or injection can always be performed at a constant mixing ratio.

Also, since it does not require a stirrer like conventional ones,
Initial costs and running costs can be reduced.

Moreover, since the chemical solution is mixed and adjusted each time it is sprayed or injected, it is possible to eliminate irregularities in the mixing ratio and excess/deficiency of the amount.

Furthermore, each time it is sprayed or injected, the chemical solution is mixed and adjusted, eliminating irregularities in the mixing ratio and excess/deficiency of the amount. It is possible to eliminate pollution problems caused by discharging liquid on the ground or sewage, etc.

In addition, after the spraying or injection work is completed, there is no need to clean the distan, which stores the mixed chemical solution, as in the case of conventional methods, and the time and effort required for cleaning can be omitted. There are many advantages such as eliminating the risk of the remaining mixed chemical solution adhering to the operator during cleaning.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a chemical liquid spraying device taken longitudinally through a chemical liquid mixer. 2... Liquid storage tank, 3... Water, 4... Pressure pump, 5... Chemical liquid mixer, 6... Liquid supply path, 7...
... Injection device, 9... Slurry tank, 10... Slurry, 11... Chemical liquid supply pump, 12... Slurry supply path, 20... Backflow prevention valve, 24... Check valve, 25 ...reflux path, 29...opening/closing valve, 28...
Opening/closing control mechanism.

Claims (1)

[Claims] (1) A backflow prevention valve is provided in the liquid supply path that sucks the liquid in the liquid storage tank with a pressure pump and supplies it to the injection device, and the slurry in the slurry tank is sucked with the chemical liquid supply pump and the liquid in the chemical liquid supply path is A slurry supply path is formed so that the slurry is supplied under pressure to a downstream part from the backflow prevention valve, a check valve is provided at the confluence of the liquid supply path and the slurry supply path, and a reflux path leads from the middle of the slurry supply path into the slurry tank. What is claimed is: 1. A chemical liquid mixer, characterized in that a recirculation path is provided with an on-off valve that opens and closes the flow path, and an opening/closing control mechanism that controls the on-off valve using pressure on the discharge side of a chemical liquid supply pump.