JP2008193960A - Chemical fluid-ejecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical fluid-ejecting device which will not deteriorate, even by a chemical fluid having high erosion properties and corrosiveness and quantitatively ejecting the chemical fluid. <P>SOLUTION: The chemical fluid-ejecting device is equipped with a chemical fluid tank for storing the chemical fluid, an air pump for feeding pressurized air to the chemical fluid tank, a fluid-sucking tube hung down in the chemical fluid tank and having an opening and closing valve at the lower terminal, a fluid-sending tube having one terminal connected to the terminal of the fluid-sucking tube drawn out from the chemical fluid tank to the exterior, and having a chemical fluid-ejecting opening formed in the other terminal, and a lifting and lowering means of the fluid-suction tube. The opening and closing valve has a valve body constituted of the valve body being urged by a spring to close a valve seat at the lower terminal of the fluid-suction tube, and has a lower protruded part protruded therefrom. When the terminal face of the lower protruded part of the valve body of the opening and closing valve is brought into contact with the bottom wall of the chemical fluid tank, by lowering the fluid-suction tube by the lifting and lowering means, the opening and closing valve is opened to enable the chemical fluid pressurized by the pressurized air to be ejected from the fluid-ejecting opening through the fluid-suction tube and the fluid-sending tube; and when the fluid-suction tube is lifted, the opening and closing valve is closed to stop the feed of the chemical fluid. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chemical solution discharge device, and more particularly, to discharge a chemical solution in order to disinfect soil in a facility such as a field or a house where vegetables and flowers are grown.

2. Description of the Related Art Conventionally, diaphragm pumps are widely used to discharge a fixed amount of chemical liquid in a chemical liquid discharge apparatus. Japanese Patent Laid-Open No. 2005-273587 (Patent Document 1) and the like disclose a chemical liquid discharge apparatus using this type of diaphragm pump. Is provided.
However, a diaphragm made of a synthetic rubber having flexibility is generally used for the diaphragm pump. If this synthetic rubber is directly contacted with a chemical solution that is highly corrosive or corrosive and deteriorates or deforms, the chemical solution There is a problem in that the discharge amount changes and the accuracy of the discharge amount decreases.
In particular, crawl picrin used to disinfect soil in facilities such as fields and houses where vegetables and flowers are cultivated is extremely corrosive, so that the diaphragm is likely to deteriorate, making it impossible to perform quantitative discharge of chemicals. There is.

JP-A-2005-273587

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a chemical liquid discharge device capable of performing a quantitative discharge of a chemical liquid without deteriorating even a highly erodible and corrosive chemical liquid. Yes.

In order to solve the above problems, the present invention provides:
A chemical tank for storing the chemical,
An air pump for supplying pressurized air into the chemical tank;
A liquid absorption pipe that hangs down in the liquid chemical tank and has an open / close valve at the lower end;
A liquid feed pipe having one end connected to the tip of the liquid suction pipe drawn out from the chemical liquid tank and having a chemical liquid discharge port at the other end;
Comprising a lifting means for the liquid absorption pipe,
The on-off valve biases the valve body with a spring to close the valve seat at the lower end of the liquid suction pipe, and has a downward projecting portion from the valve body,
When the liquid suction pipe is lowered by the elevating means and the end surface of the lower end protruding portion of the valve body of the open / close valve is brought into contact with the bottom wall of the chemical tank, the open / close valve is opened and pressurized by the pressurized air. The chemical solution is discharged from the chemical solution discharge port through the liquid supply tube from the chemical solution discharge port, and when the liquid absorption tube is raised, the on-off valve is closed to stop the supply of the chemical solution. A chemical solution discharge device is provided.

In the chemical liquid discharge device of the present invention, the chemical liquid is not discharged using the diaphragm pump, but the open / close valve provided at the tip of the liquid suction pipe is opened / closed using the elevating means and the chemical liquid in the chemical liquid tank is used using the air pump. Is fed into the liquid suction pipe and discharged through the liquid feed pipe.
With the above configuration, the amount of the discharged chemical can be adjusted by the opening time of the on-off valve and the pressure applied by the air pump. In addition, the on-off valve that is immersed in the chemical solution can be made of ceramic (ball) or stainless steel that can withstand the erosion / corrosion properties of the chemical solution, so it will not deteriorate like a diaphragm made of synthetic rubber even if it is used for a long time. The accuracy of the discharge amount of the chemical solution is not lowered.

Specifically, the on-off valve is provided with a valve seat that bulges in the vicinity of the lower end portion of the liquid suction pipe and has a reduced diameter at the lower end, and a valve body urged by a coil spring inside the bulge portion of the lower end. Contained. The valve body is provided with the downward projecting portion from the lower surface of a spherical head, and the downward projecting portion includes a neck portion continuing to the head portion and a lower end locking portion projecting in a truncated cone shape at the lower end of the neck portion. It has a different shape.
The on-off valve is closed by the head of the valve body biased by a coil spring seated on the valve seat, and the liquid suction pipe is lowered so that the lower end surface of the lower end locking portion contacts the bottom wall of the chemical tank. When the suction pipe further descends in this state, the valve body stops, so the head of the valve body opens away from the valve seat and the pressurized chemical liquid flows into the suction pipe. To do.
On the other hand, when the liquid suction pipe rises and the lower end locking portion of the valve body separates from the bottom wall of the chemical liquid tank, the head of the valve body is seated on the valve seat by the coil spring, and the chemical liquid flows in. Stop.
Thus, since the liquid absorption pipe is lowered by the elevating means to open and absorb the liquid, the amount of the chemical liquid to be discharged can be adjusted by adjusting the descent time of the liquid absorption pipe.

In addition, the part used as the valve box which accommodates the said valve body and a spring may be integrally provided in the lower end of a liquid absorption pipe, and you may connect the separate on-off valve to the lower end of a liquid absorption pipe.
The liquid absorption pipe (valve box when the on-off valve is a separate body) immersed in the chemical solution, the valve body and the coil spring are ceramics (balls) that can withstand chemical solutions that are highly erosive and corrosive, such as crawl picrin. It is preferable to form with or stainless steel.

The liquid absorption pipe slidably penetrates a through hole of a stopper attached to the chemical liquid tank, and a lower end portion is accommodated in the chemical liquid tank. An inner surface of the through hole of the stopper and an outer surface of the liquid absorption pipe Attach a sealing material that seals the gap between and
The upper end of the liquid absorption pipe is connected to the liquid supply pipe with a connection pipe, and the elevating means moves the plunger up and down by a driving means such as a solenoid, and the liquid absorption pipe gripping material is attached to the plunger. ,
It is preferable that the liquid suction pipe is moved up and down at a required interval by the elevating means to alternately open and close the on-off valve, and the chemical liquid is intermittently discharged from the chemical liquid discharge port.

As described above, when the solenoid is used as the drive source of the lifting / lowering means, the lifting / lowering time of the liquid suction pipe can be accurately controlled, the discharge amount of the chemical liquid can be made constant, and the intermittent discharge of the chemical liquid can be performed. It can be performed with high accuracy.
Further, when a liquid suction pipe that moves up and down is slidably fitted to the connection pipe and connected to the liquid supply pipe via the connection pipe, the vertical movement is prevented from being transmitted to the liquid supply pipe having the chemical liquid discharge port. Can be.

The pressurizing pipe connected to the air pump is branched, and one first branch pipe is protruded into the chemical liquid tank, while the other second branch pipe is connected to the liquid feeding pipe via a cock,
When discharging the chemical liquid, the cock is closed and pressurized air is supplied from the air pump to the chemical liquid tank through the first branch pipe,
After discharging the chemical liquid, the cock is opened, pressurized air from the air pump is introduced into the liquid supply pipe through the second branch pipe, and the chemical liquid remaining in the liquid supply pipe is discharged from the chemical liquid discharge port. Preferably it is.

With the above configuration, all the chemical liquid remaining in the liquid feeding pipe after the chemical liquid is discharged can be discharged with pressurized air by the air pump, and it is possible to prevent the chemical liquid from dripping from the liquid feeding pipe after the chemical liquid is discharged.
Further, it is economical that one air pump can be used for both the purpose of pressurizing the air in the chemical liquid tank and for discharging the chemical liquid remaining in the liquid feeding pipe.

  The chemical solution discharge device of the present invention includes a connecting portion that is detachably connected to a farm vehicle such as a tractor, and is most preferably used for disinfecting the soil by intermittently discharging the chemical solution into the soil. It is done.

  As described above, according to the present invention, the amount of the discharged chemical can be adjusted by the opening time of the on-off valve that is opened and closed by the elevating means and the pressurizing force by the air pump. The diaphragm which becomes can be made unnecessary. Instead of the diaphragm, if the on-off valve immersed in the chemical solution is made of chemical-resistant ceramic (ball) or stainless steel, the on-off valve will not deteriorate even if it is used for a long time, and the accuracy of the discharge rate of the chemical solution can be improved. It has the advantage of not lowering.

Embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of the present invention. A chemical discharge device 10 is connected to the rear end of a tractor (not shown) by a connecting hitch 11 (connecting portion) provided at the front portion. While being pulled, the chemical solution Y made of chlorpicrin is discharged onto the soil G to disinfect the soil G.

  The chemical discharge device 10 has a chemical tank 13 in which the chemical Y is stored on a frame 12 connected to the rear of the connecting hitch 11. An opening 13b for inserting a pipe into the chemical liquid tank 13 is provided on the upper wall 13a of the chemical liquid tank 13, and the liquid suction pipe 15 and the pressurizing pipe 30 are connected to the plug 14 fitted in the opening 13b. Two pipes are penetrated.

The liquid absorption pipe 15 extends in the vertical direction, the lower side is inserted into the chemical liquid tank 13 through the stopper 14, and the on-off valve 17 provided at the lower end is immersed in the chemical liquid Y. On the other hand, the upper end of the liquid suction pipe 15 is connected to the liquid feed pipe 16 via the connection pipe 18. The connecting pipe 18 is slidably fitted to the upper end portion 15 a of the liquid suction pipe 15 at the lower end side, and is fixed to the lower end portion 16 a of the liquid feeding pipe 16 at the upper end side.
The liquid supply pipe 16 extends rearward from the connection position with the connection pipe 18, the rear end of the liquid supply pipe 16 hangs downward, the lower end serves as a chemical liquid discharge port 16b, and the frame 12 is formed at a lower portion including the chemical liquid discharge port 16b. A chemical injection sword 19 fixed to the rear end is attached, and the chemical injection sword 19 is inserted into the soil G.

  On the other hand, one end of the pressurizing pipe 30 is connected to the air pump 31, the other end is branched, and one branch pipe 30a is inserted into the chemical tank 13 through the plug 14, while the other branch pipe 30b is connected to the other branch pipe 30b. Is connected to the connecting pipe 18 via a cock 32 and communicated with the liquid feeding pipe 16. The distal end of the branch pipe 30 a inserted in the chemical liquid tank 13 is positioned in the chemical liquid tank 13 without being immersed in the chemical liquid Y.

The liquid absorption pipe 15 is formed of stainless steel or ceramic having rigidity and chemical resistance, and an elevating means 21 is provided at a location where the liquid absorption pipe 15 is pulled out from the chemical liquid tank 13. The elevating means 21 is composed of a plunger 21 a that elevates and lowers by a solenoid (not shown), and a liquid suction pipe gripping material 21 b that connects the plunger 21 a and the liquid suction pipe 15. The liquid suction pipe 15 moves up and down with the jar 21a.
Thus, although the liquid absorption pipe 15 moves up and down, since the liquid absorption pipe 15 is slidably fitted to the connecting pipe 18, the liquid supply pipe 16 does not move up and down and is held at a constant height. .
Further, in order to raise and lower the liquid absorption pipe 15, the liquid absorption pipe 15 is slidably penetrated with respect to the stopper 14, and a bellows-like sealing material 22 is provided at a position where the liquid absorption pipe 15 is pulled out from the stopper 14. The exterior of the chemical liquid tank 13 is prevented from leaving outside through the gap between the liquid suction pipe 15 and the stopper 14.

  As shown in FIG. 2, the on-off valve 17 provided in the liquid suction pipe 15 includes a valve box 23 continuing to the lower end of the liquid suction pipe 15, and the valve box 23 is made of the same material as the liquid suction pipe 15. Alternatively, it is integrally formed with the liquid absorption pipe 15 by ceramic. The valve box 23 has a cylindrical shape with a diameter larger than that of the liquid suction pipe 15, and the hollow portion S communicates with the hollow portion of the liquid suction pipe 15. Moreover, the lower side of the valve box 23 is reduced in diameter, and a valve seat 23a having a circular opening is provided at the lower end.

  A valve body 24 made of stainless steel or ceramic that opens and closes the valve seat 23a of the valve box 23 is disposed in a state of passing through the opening of the valve seat 23a. An upper part of the valve body 24 disposed in the hollow portion S of the valve box 23 is a substantially spherical head 24a larger than the opening of the valve seat 23a, and downward from the lower surface of the head 24a through the opening of the valve seat 23a. A projecting downward projecting portion 24b is provided. The downward projecting portion 24b has a shape including a neck portion 24c continuous to the head portion 24a and a lower end locking portion 24d that protrudes in the shape of a truncated cone from the neck portion 24c, and the lower end surface 24e of the lower end locking portion 24d is formed as a chemical solution. A contact surface with the bottom wall 13 c of the tank 13 is used. The valve body 24 is urged toward the lower valve seat 23 a by a spring 25 made of stainless steel or ceramic disposed in the hollow portion S of the valve box 23.

In a state in which the liquid suction pipe 15 is positioned at the upper position by the elevating means 21, the valve body 24 of the on-off valve 17 is urged downward by the spring 25 as shown in FIG. The head 24a is seated on the valve seat 23a, and the on-off valve 17 is closed.
On the other hand, when the liquid suction pipe 15 is lowered by the elevating means 21, the lower end surface 24e of the valve body 24 comes into contact with the bottom wall 13c of the chemical liquid tank 13 in the middle of the lowering, and the valve body 24 no longer descends. When the liquid suction pipe 15 is further lowered from this state, as shown in FIG. 2 (B), the valve body 24 rises relative to the descending valve box 23, and the valve seat 23a of the valve box 23 opens. A gap is created between the valve body 24 and the head 24a of the valve body 24, the valve is opened, and the chemical Y flows into the valve box 23 and the liquid suction pipe 15 through the gap, and the chemical liquid discharge port at the other end of the liquid feed pipe 16 is opened. The chemical Y is discharged from 16b.
By continuously performing such lifting and lowering operation of the liquid suction pipe 15, the open / close state of the on-off valve 17 is continuously switched.

  When the cock 32 provided on the branch pipe 30b of the pressurizing pipe 30 is opened with the on-off valve 17 closed, the pressurized air pressurized by the air pump 31 is introduced into the liquid feeding pipe 16 through the branch pipe 30b. All of the chemical Y remaining in the liquid feeding pipe 16 is discharged by the pressurized air.

Next, the usage method of the said chemical | medical solution discharge apparatus 10 is demonstrated.
First, the chemical liquid discharge device 10 is connected to the rear end of a tractor (not shown) by the connecting hitch 11 and is operated while being pulled by the tractor.
At the start of operation, the cock 32 is closed and pressurized air is supplied to the chemical liquid tank 13 by the air pump 31. In this state, the liquid suction pipe 15 is continuously raised and lowered by the lifting means 21 to continuously open and close the on-off valve 17. In the state where the on-off valve 17 is opened, the chemical liquid Y is pushed out into the liquid suction pipe 15 through the on-off valve 17 by the pressurized air in the chemical liquid tank 13, and the chemical liquid discharge port at the other end of the liquid supply pipe 16. 16b is discharged into the soil G. Thus, in order to open and close the on-off valve 17 continuously, the chemical liquid Y is intermittently discharged into the soil G.
In the present embodiment, 3 cc of the chemical solution Y is discharged by one discharge by appropriately setting the pressure applied by the air pump 31 and the opening amount and opening time of the on-off valve 17.
Further, the operation of the elevating means 21 is set so that the on-off valve 17 is opened once every time the tractor pulling the chemical solution discharging apparatus 30 moves 30 cm, and the chemical solution Y is discharged to the soil G at intervals of 30 cm.

  When the chemical solution discharge operation is finished, the elevating means 21 is stopped, the on-off valve 17 is closed, the cock 32 is opened, and the pressurized air pressurized by the air pump 31 is supplied to the liquid feeding pipe 16 through the branch pipe 30b. The chemical liquid Y that has been introduced and remains in the liquid feeding pipe 16 is completely discharged by pressurized air.

According to the above configuration, since the amount of the chemical liquid Y to be discharged is adjusted by the pressure applied by the air pump 31, the opening amount of the on-off valve 17, and the opening time, a conventional diaphragm made of synthetic rubber becomes unnecessary. The on-off valve 17 that is immersed in the highly erodible and corrosive chemical Y is made of a material that can withstand the erosive and corrosive properties of the chemical Y, so that the on-off valve 17 deteriorates even when used for a long time. Therefore, it is possible to perform quantitative discharge without reducing the accuracy of the discharge amount of the chemical liquid Y.
Further, all of the chemical Y remaining in the liquid feeding pipe 16 after the chemical liquid is discharged can be discharged with the pressurized air pressurized by the air pump 31, and the chemical liquid Y is prevented from dripping from the liquid feeding pipe 16 after the chemical liquid is discharged. be able to.
Further, since there is no flow resistance such as a check valve in the liquid suction pipe 15 and the liquid feed pipe 16 that are the flow path of the chemical liquid Y, efficient chemical liquid discharge is possible.

  The chemical solution discharge device of the present invention is preferably used as a device for quantitatively discharging a chemical solution for disinfecting soil in facilities such as fields or houses where vegetables and flowers are grown, and is erodible and corrosive. It is particularly preferably used as one that discharges a drug such as strong chlorpicrin.

It is the schematic which shows the chemical | medical solution discharge apparatus of embodiment of this invention. (A) is drawing which shows the state which closed the on-off valve, (B) is drawing which shows the state which opened the on-off valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chemical liquid discharge apparatus 13 Chemical liquid tank 15 Liquid absorption pipe 16 Liquid supply pipe 17 On-off valve 21 Elevating means 23 Valve box 23a Valve seat 24 Valve body 24a Head 25 Spring 30 Pressurizing piping 31 Air pump 32 Cock G Soil Y Chemical liquid

Claims (3)

A chemical tank for storing the chemical,
An air pump for supplying pressurized air into the chemical tank;
A liquid absorption pipe that hangs down in the liquid chemical tank and has an open / close valve at the lower end;
A liquid feed pipe having one end connected to the tip of the liquid suction pipe drawn out from the chemical liquid tank and having a chemical liquid discharge port at the other end;
Comprising a lifting means for the liquid absorption pipe,
The on-off valve biases the valve body with a spring to close the valve seat at the lower end of the liquid suction pipe, and has a downward projecting portion from the valve body,
When the liquid suction pipe is lowered by the elevating means and the end surface of the lower end protruding portion of the valve body of the open / close valve is brought into contact with the bottom wall of the chemical tank, the open / close valve is opened and pressurized by the pressurized air. The chemical solution is discharged from the chemical solution discharge port through the liquid supply tube from the chemical solution discharge port, and when the liquid absorption tube is raised, the on-off valve is closed to stop the supply of the chemical solution. A chemical discharge device. The liquid absorption pipe slidably penetrates a through hole of a stopper attached to the chemical liquid tank, and a lower end portion is accommodated in the chemical liquid tank. An inner surface of the through hole of the stopper and an outer surface of the liquid absorption pipe Attach a sealing material that seals the gap between and
The upper end of the liquid absorption pipe is connected to the liquid supply pipe with a connection pipe, and the elevating means moves the plunger up and down by a driving means such as a solenoid, and the liquid absorption pipe gripping material is attached to the plunger. ,
The chemical solution discharge apparatus according to claim 1, wherein the liquid suction pipe is raised and lowered at a predetermined interval by the elevating means to alternately open and close the on-off valve, and the chemical solution is intermittently discharged from the chemical solution discharge port. The pressurizing pipe connected to the air pump is branched, and one first branch pipe is protruded into the chemical liquid tank, while the other second branch pipe is connected to the liquid feeding pipe via a cock,
When discharging the chemical liquid, the cock is closed and pressurized air is supplied from the air pump to the chemical liquid tank through the first branch pipe,
After discharging the chemical liquid, the cock is opened, pressurized air from the air pump is introduced into the liquid supply pipe through the second branch pipe, and the chemical liquid remaining in the liquid supply pipe is discharged from the chemical liquid discharge port. The chemical | medical solution discharge apparatus of Claim 1 or Claim 2.

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