JP2000139149A - Device for injecting liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid injection device for inserting into soil a liquid injection pipe connected to a liquid-supplying pump and then injecting a liquid from the tip nozzle of the pipe into the soil, capable of injecting a constant volume of the liquid. SOLUTION: This device for injecting a liquid is obtained by connecting an air tank 31 having a pressurized air-supplying port 34 to the float chamber of a float valve 32, connecting the valve hole side of the float valve 32 to the liquid inlet of an injection portion 33, connecting the liquid supply port of the injection portion 33 to a liquid supply pump through a liquid supply hose 72, allowing a liquid injection pipe 60 to communicate with a liquid exit disposed between the liquid inlet and the liquid supply port, and disposing switch valves in the liquid supply port and the liquid exit, thereby making it possible to switch into a liquid supply state for supplying the liquid into the air tank 31 or into a liquid injection state for injecting the liquid into soil through the liquid injection pipe 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid injection device,
For example, it is used as a manual chemical liquid injector for supplying liquid fertilizer to the base of agricultural products.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a conventional manual liquid injection device for supplying a liquid fertilizer to the root of a crop is arranged in a vertical direction of a cross-shaped device base 1 as shown in FIGS. A valve seat 3 is provided inside the valve chamber 2, and a valve rod 5 of a valve body 4 in contact with the valve seat 3 passes through a closing plug 6 at an upper end of the valve chamber 2 so as to be vertically movable. A coil spring 7 is housed in the valve chamber 2, whereby the valve body 4 is pressed against the valve seat 3 to close the valve.

[0003] The upper end of a link 11 is fixed by a pair of nuts 9 to a thread 8 of a valve stem 5 protruding upward from an obturator plug 6. The lower end of the link 11 is rotatably connected to a lever 12 by a connecting pin 13, and the tip of the lever 12 is rotatably attached to the device base 1 by a fulcrum pin 14.

[0004] On both sides of the valve chamber 2, cylindrical arms 15, 15 ′ are provided in the horizontal direction. One arm 15 communicates with the inside of the valve chamber 2 through a communication hole 16, and further has a distal end. Is connected to a hose 18 via a joint 17. The hose 18 is connected to a liquid supply pump. The other arm 15 ′ does not communicate with the valve chamber 2. Arm 15, 15 'above
Are covered with grips 19 and 19 '.

[0005] An injection pipe 21 is connected to the lower end of the valve chamber 2, a nozzle 22 is attached to the lower end of the injection pipe 21, and a nozzle 22 having an inverted conical tip is provided at the lower end. Can be

In the above-described liquid injection device, the hose 18 is connected to the liquid supply pump, the tip of the injection pipe 21 is inserted into the soil by gripping the grips 19, 19 ', and the lever 11 is gripped. The valve body 4 is pulled up through the valve and opened, whereby the liquid is injected from the nozzle 22 into the soil.

In the above liquid injection device, the nozzle 2
The amount of liquid injected into the soil from 2 is determined by the length of time the lever 12 is held.

[0008]

On the other hand, in growing crops, it is desirable that the amount of fertilizer per plant is equal for those of the same species that grow at the same time.

However, as described above, in the conventional liquid injection device, the amount of supply is determined by the length of time during which the lever 12 is held, so that the time is kept constant due to the arbitrariness or habit of the operator. There is a problem that it is difficult to determine the amount of the liquid, which makes it difficult to supply a fixed amount of liquid.

[0010] Therefore, an object of the present invention is to provide a liquid injection device capable of easily supplying a fixed amount of liquid.

[0011]

In order to solve the above-mentioned problems, the present invention comprises an air tank, an injection section with a float valve and a switching valve, and the air tank is provided with a pressurized air supply section and the float. The float valve is configured to be closed by an air pressure applied to the float chamber, and to float and open by a liquid entering the float chamber. Is connected to the liquid inlet of the injection section, and the injection section is provided with a liquid supply port communicating with the liquid inlet, and a liquid outlet communicating with the liquid inlet and the liquid supply port. An injection pipe is connected to the liquid outlet, and a liquid supply state in which the liquid supply port and the liquid inlet are connected by the switching valve, and a liquid injection state in which the liquid inlet and the liquid outlet are connected by an external operation. Switchable It is obtained by the configuration.

The above-mentioned pressurized air supply unit can be configured to have a check valve that allows the inflow of the pressurized air and prevents the outflow thereof.

[0013] The switching valve comprises a first switching valve provided at the liquid supply port, a second switching valve provided at the liquid outlet, and an interlocking device thereof. Can be configured by a link mechanism that switches the opening and closing of the first switching valve and the second switching valve so that they have the opposite relationship to each other.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a liquid supply apparatus according to an embodiment includes an air tank 31, a float valve 32, and an injection section 33 as main components.

At the upper end of the air tank 31, a pressurized air supply unit 34 is provided. The pressurized air supply unit 34 fixes the valve chamber member 35 to a tank upper end port 37 by a nut 36 as shown in FIG. A valve seat 38 is fixed in the valve chamber member 35 by a fixing member 39,
The lower end of the valve body 41 inserted into the valve seat 38 is pressed against the lower end surface of the valve seat 38 by a coil spring 42 mounted around the valve body 41, and is kept in a normally closed state.

The upper end of the valve rod 43 of the valve body 41 is
And the upper end of the valve chamber member 35 is
Is closed by

The cap 44 is removed and the valve chamber member 35 is removed.
When an air compressor or a manual air pump is connected to the upper end of the valve and the valve element 41 is pushed together with the valve rod 43, the valve is opened, and pressurized air is sent into the air tank 31 until a constant pressure is reached. When the feeding is completed, the valve body 41 is closed by the spring force of the coil spring 42.

The lower end port 4 of the air tank 31 described above.
5 is connected to a first hose 46, and the other end of the first hose 46 is connected to the float valve 32.

As shown in FIG. 3, the float valve 32 has a float chamber 48 provided inside a valve case 47, a liquid outlet 49 provided at an upper portion thereof, and the first hose 46 provided at the liquid outlet 49. Connected. A valve hole side inlet 50 having a valve hole 51 is provided at the lower end of the valve case 47.

A valve body 53 having a float 52 is housed in the valve case 47, and is guided by several vertical ribs 54 provided on the outer peripheral surface of the float 52 so as to be freely slidable in the vertical direction. Has become. The valve body 53 closes the valve hole 51 when pressurized air is supplied into the float chamber 52 from the liquid outlet 49 side via the first hose 46. When the liquid is supplied from the valve hole side inlet 50 through the valve hole 51, the liquid floats by its buoyancy and opens the valve hole 51. A second hose 55 is connected to the valve hole side inlet 50, and the second hose 5 is connected to the second hose 55.
The other end of 5 is connected to the injection section 33 described above.

A pressure gauge 56 communicating with the float chamber 48 is mounted on the valve case 47.

The injection part 33 has a base 57 made of a T-shaped joint.
A liquid inlet 58 is provided at the end of the horizontal arm, a liquid supply port 59 is provided at the end of the arm facing the liquid inlet 58, and a liquid outlet 61 is provided at the lower end of the downward arm therebetween.

A grip pipe 62 is connected to the liquid inlet 58, and a grip 63 is attached to the grip pipe 62. The second hose 55 is connected to the other end of the grip pipe 62 (see FIG. 1). Further, a liquid injection pipe 60 is connected to the liquid outlet 61.

The liquid supply port 59 accommodates a first switching valve 64, and the liquid supply port 59 is provided with one valve seat 65 for supporting the first switching valve 64, and the other valve seat 66 is provided with a liquid supply port. It is provided on a mouthpiece 67 screwed into the mouth 59. A fitting 68 is connected to the fitting 67 by a nut 69, an auxiliary grip 71 is connected to the fitting 68, and a liquid supply hose 72 is connected to the auxiliary grip 71 via a joint 73 (see FIG. 1). . The liquid supply hose 72 is connected to a liquid supply pump (not shown).

Outside the base 57, a switching lever 75 having an operating portion 75a is attached to a valve shaft 74 of the first switching valve 64 (see FIG. 5). The switching bar 75 is shown in FIG.
As shown in FIGS. 4 and 5, when the first switching valve 64 is in the open state when in the posture parallel to the auxiliary grip 71, the first switching valve 64 is rotated by 90 degrees from this state to be in the posture parallel to the liquid injection pipe 60. At this time (see the dashed line in FIG. 6), the valve is closed.

A second switching valve 76 is connected to the liquid outlet 61.
Is accommodated in the liquid outlet 61, one valve seat 77 supporting the second switching valve 76 is provided, and the other valve seat 78 is provided in a mouthpiece 79 screwed to the liquid outlet 61. Base 79
Is connected to the liquid injection pipe 60. Outside the base 57, a switching lever 82 is attached to the valve shaft 81 of the second switching valve 76.
Is attached. When the switching lever 82 is in a position parallel to the auxiliary grip 71 as shown in FIGS. 1 and 4, the second switching valve 76 is in a closed state. When the posture is reached (see the dashed line in FIG. 6), the valve is opened.

Each of the above-mentioned switching levers 75 and 82, link 8
Reference numeral 3 denotes an interlocking device including a link mechanism, and each of the switching levers 75 and 82 can rotate around the valve shafts 74 and 81 while maintaining a parallel state. As a result, the first switching valve 64 shown in FIG.
6 is a liquid supply state in which the valve is closed (see arrow a in FIG. 4), and a liquid injection state in which the first switching valve 64 shown in FIG. 6 is closed and the second switching valve 76 is opened (arrow a in FIG. 6). ) Can be switched by operating the switching lever 75.

At the lower end of the liquid injection pipe 60, a nozzle 84 having an inverted conical tip is provided.

The apparatus of the embodiment is as described above.
When this is used, the switching lever 75 is operated in advance to set the injection state shown in FIG. 6, and the supply of the liquid from the liquid supply pump is cut off.

Then, a nozzle of a pressurizing device such as an air compressor is connected to the pressurized air supply section 34 of the air tank 31, and pressurized air is supplied to pressurize the inside of the air tank 31 to a predetermined pressure. In this case, a predetermined amount of liquid is supplied into the air tank 3 later by a liquid supply hose 72.
The pressure applied by the pressurized air supplied in advance in this manner is such that the required amount of liquid can be filled from the liquid supply pump via the liquid supply pump.

The above-mentioned bias pressure is supplied to the float valve 32 through the first hose 46, and the pressure is applied to the valve body 5 by the pressure.
3 is depressed to close the valve hole 51, so that the bias pressure of the air tank 31 is kept constant. This pressure is indicated by the pressure gauge 56.

After the above preparations are completed, the worker carries the air tank 31 by hanging it on the shoulder with the hanging string 85 attached to the air tank 31 or carrying the air tank 31 by holding the grip 63 and the auxiliary grip 71. Insert the injection pipe 60 into the soil. Then, when the switching lever 75 is rotated by 90 degrees so as to be parallel to the liquid injection pipe 60, the liquid supply state shown in FIG. 4 is obtained, and the liquid discharged from the liquid supply pump is supplied to the liquid supply hose 72, It is supplied to the float valve 32 via the two hoses 55, and the valve body 53 of the float valve 32 is floated to open the valve hole 51.

Thus, the liquid is supplied from the first hose 46 into the air tank 31. In the air tank 31, the liquid is supplied while increasing the bias pressure until the liquid balances the pressure. After confirming with the pressure gauge 56 that the pressure has reached the balanced state, the switching lever 75
Is operated so as to be parallel to the auxiliary grip 71, as shown in FIG. 6, a liquid injection state is achieved, and the liquid is injected into the soil from the nozzle 84 via the injection pipe 60.

As the liquid is injected into the soil from the nozzle 84, the liquid in the air tank 31 decreases, and at the same time, the liquid in the float valve 32 decreases. Immediately before the liquid becomes zero, the valve body 53 closes the valve hole 51, so that the bias pressure in the air tank 31 is secured without dropping.

Although the internal pressure decreases as the liquid in the air tank 31 decreases, the bias pressure is ensured even at the lowest, so that the liquid is injected with a sufficiently strong pressure until the end.

[0036]

Since the present invention is as described above, by setting the bias pressure in the air tank to be constant, the amount of liquid to be filled therein becomes constant,
Since the whole amount of the liquid is injected into the soil, there is an effect that the injection amount is always constant.

Further, by operating the switching valve from the outside, it is possible to appropriately switch between the liquid supply state and the liquid injection state, so that work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 (a) is a cross-sectional view of an air pump part according to the embodiment; FIG. 2 (b) is a partially enlarged cross-sectional view of FIG.

FIG. 3 is a sectional view of the float valve according to the first embodiment;

FIG. 4 is a partial longitudinal front view of the injection device of the above.

Fig. 5 is a partial cross-sectional plan view of the injection device of the above.

FIG. 6 is a partial longitudinal front view of another state of the injection device of the above.

FIG. 7 is a partially omitted front view of a conventional example.

FIG. 8 is a partially enlarged sectional view of the above.

[Explanation of symbols]

 Reference Signs List 31 air tank 32 float valve 33 injection section 34 pressurized air supply section 35 valve chamber member 36 nut 37 tank upper end port 38 valve seat 39 fixing member 41 valve body 42 coil spring 43 valve rod 44 cap 45 tank lower port 46 first hose 47 valve case 48 float chamber 49 liquid outlet 50 valve hole side inlet 51 valve hole 52 float 53 valve body 54 rib 55 second hose 56 pressure gauge 57 base 58 liquid inlet 59 liquid supply port 60 liquid injection pipe 61 liquid outlet 62 grip pipe 63 Grip cover 64 First switching valve 65 Valve seat 66 Valve seat 67 Mouth fitting 68 Joint fitting 69 Nut 71 Auxiliary grip 72 Liquid supply hose 73 Joint 74 Valve shaft 75 Switching lever 75a Operating section 76 Second switching valve 77 Valve seat 78 Valve Seat 79 Base 81 Valve stem 82 Switching lever 83 Link 4 nozzle 85 hanging cord

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[Procedure amendment]

[Submission date] November 6, 1998 (1998.11.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

[0030] Then, connect the nozzles of the pressure device such as an air compressor to a pressurized air supply section 34 of the e Atanku 31, pressurizing the inside of the air tank 31 to a predetermined pressure by supplying pressurized air. In this case, a predetermined amount of liquid is supplied into the air tank 3 later by a liquid supply hose 7.
The pressure is such that a required amount of liquid can be charged from the liquid supply pump through the step 2 and the pressure pressurized by the pre-supplied pressurized air is hereinafter referred to as a bias pressure.

Claims (3)

[Claims] 1. An air tank, a float valve, and an injection section with a switching valve, wherein the air tank is communicated with a pressurized air supply section and a float chamber of the float valve, respectively. The valve is closed by air pressure applied to the float chamber, and is configured to float and open by the liquid entering the float chamber.The valve hole side inlet of the float valve is connected to the liquid inlet of the injection part, A liquid supply port communicated with the liquid inlet and a liquid outlet communicated between the liquid inlet and the liquid supply port are provided at the injection part, and an injection pipe is connected to the liquid outlet. A liquid injection device capable of switching between a liquid supply state in which a supply port communicates with a liquid inlet and a liquid injection state in which the liquid inlet communicates with a liquid outlet by an external operation. 2. The liquid injection device according to claim 1, wherein the pressurized air supply unit has a check valve that allows inflow of pressurized air and prevents outflow thereof. 3. The switching valve comprises a first switching valve provided at the liquid supply port, a second switching valve provided at the liquid outlet, and an interlocking device thereof. 3. The liquid injection device according to claim 1, wherein the interlocking device is configured by a link mechanism that switches the opening and closing of the first switching valve and the second switching valve so that the opening and closing of the second switching valve are opposite to each other.