JPS6251936A - Air sucking preventing apparatus in liquid fertilizer irrigation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air inhalation prevention device used for liquid fertilizer irrigation. More specifically, in mulching cultivation and greenhouse cultivation, it is common to add liquid fertilizer (liquid fertilizer) at the same time as shrubs (irrigation), but the present invention also provides air in the pump in such cases. This relates to a device that prevents the inflow of. (Problems with the Prior Art) In general, in the case of liquid fertilizer shrubs, one section is usually set so that the working time is 10 to 20 minutes.

When one section of liquid fertilizer has been irrigated, the liquid level in the liquid fertilizer container will drop, and the suction port placed at a predetermined position below the liquid level will be exposed to the air layer above the liquid level. However, air flowing into the pump obstructs or stops its suction action, making it necessary to readjust and start the pump for secondary irrigation. An object of the present invention is to provide a device that prevents air from flowing into the pump even in such a case. Until the development of drip irrigation tubes a few years ago, nozzle-type irrigation systems were exclusively used, but have now been replaced by spot irrigation tubes. A spot irrigation tube is a long tube that becomes flat when no pressure is applied, but when water is injected, it swells up into a circular tube shape.The inside of the tube is filled with filter paper that is the diameter of a circle when viewed in cross section. It is divided into two compartments by a thin (filter paper) material. When water is flowed through one of these compartments at normal pressure, some of the water passes through the filter-like material and flows into the opposite compartment, but the resistance to passage through the filter paper reduces the water pressure and flow rate. Both decrease and flow.

By mixing liquid fertilizer in a small amount of water at this low pressure and flowing it, the small amount of water containing liquid fertilizer will be applied in a spotwise manner, so no fertilizer damage will occur.

Furthermore, the labor involved in applying fertilizer directly to the soil surface, which is conventional, is also reduced. On the other hand, in terms of cultivation methods, mulch cultivation and greenhouse cultivation are popular nationwide, but mulching is a method of covering the soil with a plastic film such as polyethylene film, and its purpose is to These include raising the soil, preventing leaching of nutrients from the soil, reducing evaporation of water from the soil surface, suppressing weeds, allowing fruit vegetables, leafy vegetables, root vegetables, etc. to ripen earlier, and increasing yields.

For this purpose, in mulch cultivation, a method of top-dressing by mixing liquid fertilizer with irrigation water using spot irrigation tubes has become popular. As cultivation greenhouses have become larger, in order to irrigate the entire cultivated area in one operation, the amount of water required per unit time is large, and the irrigation equipment must also be larger. Water is divided into several times, for example, 5 to 10 times.

A pump is used for irrigation, and in the case of additional fertilization, liquid fertilizer is mixed and watered by sucking liquid fertilizer diluted about 10 times into the pump at a certain ratio to the amount of watering.

When irrigating one plot for 30 minutes, it is necessary to reduce the watering time with liquid fertilizer mixture to about half that time, about 15 minutes, and to water only water for the remaining 15 minutes.

The reason for this is, firstly, that the liquid fertilizer applied by mixed water irrigation must be allowed to fall to the vicinity of the crop roots in the soil and be absorbed by the subsequent 15 minutes of water-only irrigation; The second reason is to prevent the filter in the irrigation tube from becoming clogged with liquid fertilizer by washing the filter part with water and pouring it into the soil; when preparing diluted liquid fertilizer, add it to each plot. Diluting it is troublesome and inefficient, so prepare the amount needed for the area of cultivated land to be irrigated and place it in a large container of about 100 to 200 liters. When watering, it is difficult to adjust the required amount of liquid fertilizer for each compartment by operating a valve, and it is extremely uneconomical in terms of labor to station a guard near the container to ensure accurate liquid fertilizer irrigation. Therefore, I use a method of checking the liquid fertilizer container at a fixed time while working in a place far away from the container, but if the check is delayed, the planned amount of liquid fertilizer will be sucked in during that time, and air will leak into the hose. The liquid flows into the pump and is sucked into the pump, stopping the suction action of the pump. This work is extremely complicated and inefficient, so after the planned amount of liquid fertilizer has been applied to the plants, the suction of air into the pump is automatically stopped and water-only irrigation continues. The development of a device was desperately needed.

(Means for Solving the Problems) In the present invention, even if a relatively small amount of air flows into the space between the container containing liquid fertilizer and the irrigation pump, the valve leading to the pump closes. This problem was solved by installing a device in the piping from the pump to the pump to prevent air from flowing in an amount that would cause the pump to stop suction.

(Embodiments) Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side cross-sectional view showing the main parts of a device for preventing air from flowing into a pump according to the present invention, in which reference characters (in the following description, only numbers are used instead of repeated references). show).

Reference numeral 1 denotes a main body outer can, which consists of two parts: a large-diameter float chamber 1° for accommodating a float 4, and a valve chamber 1'' for accommodating a lower valve body 2.
A lid 20 is screw-coupled to the upper end of the main body to maintain airtightness between the inside and outside of the main body. A discharge pipe 6 is provided at the bottom of the lower end of the valve chamber 1'' and projects downward in the axial direction.
Its upper end is designed to act as seat 3.

A suction pipe 7 that projects upward is provided at the upper end of the lid 20. Inside the float chamber 1', a cylindrical float 4 with a bottom shaped like a pot is installed in an inverted state so as to be freely floating up and down within 1° of the float chamber.

A valve body 2 is arranged below the float 4 and above the valve seat 3, the lower end of which constitutes a valve 2'.

The float 4 and the valve body 2 are connected by a valve suspension line 5 suspended from the upper end surface of the float 4, that is, from the center of a portion corresponding to the bottom of the tip.
When the valve body 2 rises, the valve body 2 is also pulled upward. The connection between the valve lifting line 5 and the valve body 2 is as shown in the 113th line.
It is lined by a bin 10 passing transversely through the top of the. The valve lifting wire 5 and pin 10 are shown in FIG. An air suction pipe 8 passes through the lid 20 and projects into the float chamber 1', so that air can flow inside and outside the float chamber only through this air suction pipe 8. For this purpose, the portion where the air suction pipe 8 passes through the lid 20 is tightened to maintain airtightness.

A stopper 17 protrudes downward from the inner surface of the lid 20 into the float chamber, and serves to stop the float 4 from floating any further upward. Since it is longer than the axial protrusion length,
Even if the float 4 floats to the top, the air suction pipe 8
A gap is maintained between the lower end of the tube and the inlet of the air suction pipe is not blocked.

As shown in FIGS. 4A and 4B, 12 is a support stand for holding the device of the present invention, and has a plurality of support legs 12''.
The main body 1 is inserted into the supporting rings 12'' held by the support rings 12'' (three in the figure) and securely supported.As shown in FIG. is attached to the underwear side t± of the cock stopper 11, as shown in FIG.
The opening A on the opposite side is connected to the above-mentioned discharge pipe 6 through a vinyl pipe, etc., and the opening B on the opposite side is connected to the irrigation pump 3.
0 and the rising part of the underground water pumping vibe 32,
The remaining opening C is connected to the air suction pipe 8 mentioned above.
The openings A and B are directly connected, and the openings A, B, and C are opened or closed to flow of liquid fertilizer by a stopper 11.

FIG. 6A is a perspective view of the container 14 containing liquid fertilizer,
A scale plate 16 indicating the amount of liquid fertilizer is provided inside the container, and a guide rod 15 is provided extending vertically along the scale plate 16.

Figure 6B shows the suction pipe 13 for suctioning liquid fertilizer and mixing it with water for additional fertilization. Hole 1
3' through the guide rod 15 and fixed in place. By adjusting the amount of settling, the amount of liquid fertilizer fed at one time can be adjusted. When the supply of liquid fertilizer corresponding to one dose is completed, the opening of the suction pipe 13 is exposed above the water surface, and air flows into the main body 1 from here.

The suction pipe 7 of this device is connected to the suction pipe 13 with a vinyl pipe or the like, and in this way, the liquid fertilizer container 14 is connected to the suction pipe 13 of this device.
, a flow path leading to the irrigation pump 30 via the three-way cock 9 is formed.

When watering, the location is as shown in Figure 8, for example A and B.
, and C are irrigated.

As mentioned above, the irrigation time per plot is 20 to 3 times.
Select within the range of 0 minutes and switch the irrigation zone as appropriate using the valve.

(effect) Next, the operation of the air suction prevention device of the present invention will be described.

The above-mentioned spot irrigation tube is connected to the downstream side of the pump P, as shown in FIG. Before starting the pump P, open the stopper 11 of the three-neck cock 9 and then start the pump P, and the flow path from the pump to the liquid fertilizer container 14 via the main pipe, the three-neck cock 9, and the main body 1 is connected. Therefore, the float chamber 1° is initially filled with air, the float is lowered, and the valve 2 is seated on the valve seat 3.

The air inside the float chamber is supplied from the air suction pipe 8 to the three-way cock 9.
Since the fertilizer liquid in the liquid fertilizer container 14 flows into the float chamber, the liquid level in the chamber gradually rises. The float can 4 is an inverted cylinder with a bottom like a pot, and since air is trapped inside, the float can begins to rise due to buoyancy and as the liquid level rises. Continue to rise.

The valve 2 is then lifted up by the rise of the float can and separated from the dispenser, and the liquid fertilizer begins to flow through the discharge can 6.
At this point, when the three-way cock 9 is closed, the liquid fertilizer continues to flow out only through the discharge tube 6.

On the other hand, the liquid level of the liquid fertilizer in the liquid fertilizer container 14 gradually decreases.

When a predetermined amount of liquid fertilizer has been applied and the liquid level falls below the suction pipe 13, air flows into the float chamber 1' from the open end of the suction pipe 13, and the liquid level in the chamber begins to drop, thereby lowering the float can. 4 also begins to descend, and valve body 2 also descends to valve seat 3.
Since the pump sits on the pump and blocks fluid from flowing downstream, air is completely prevented from reaching the pump in sufficient quantities to stop the pump from suctioning. In this way, even after a predetermined amount of liquid fertilizer has been irrigated, the pump will not suck in air and become inoperable, so it is possible to continue irrigating with only water. Further, when the liquid fertilizer is to be irrigated next time, the work can be resumed immediately by simply lowering the suction pipe 13 to the scale corresponding to the next supply amount and opening the three-mouth cock 9.

(Effects of the Invention) As described above, the device of the present invention has a simple structure, does not require a special electric circuit, is easy to operate, and is less likely to malfunction, so it is suitable for multi-cultivation, greenhouse cultivation, etc. It is an extremely effective device that can be easily used even by ordinary employees, and will make a significant contribution to industry.

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing the device structure of the present invention; Figure 2 (A)
The figure is a side cross-sectional view showing the state in which the float chamber is filled with liquid fertilizer, the float has moved to the uppermost position, and the valve is open;
Figure B) is a side sectional view showing the state in which the liquid level has fallen, the float has descended, and the valve is closed; Figure 3 (A) and Figure CB) are plan views showing the valve suspension line and pin, respectively; Figure 4 Figures (A) and (B) are perspective views showing the device mounted on a support stand and only the support stand; Figure 5 is a side view of a three-way cock suitable for use with this device. ;6th (
Figures A) and (B) are a slope view of the liquid fertilizer container and a plan view of the suction pipe, respectively; Figure 7 is a schematic side view showing the connection relationship of the three-way cock, underground water pumping pipe, etc. used in conjunction with this device. Figure 8 is a schematic diagram showing the arrangement of this equipment, irrigation pump, liquid fertilizer container, irrigation main pipe, and each irrigation section.
It is a top view. ■=Main body, l゛: Float chamber: t”: Valve chamber. 2: Valve body, 3: Valve seat, 4: Float can, 5: Valve lifting line, 6: Discharge pipe, 7: Suction pipe, 8: Air suction pipe, 9: Sanrocock, 1O: Bottle, 11: Stopper. 13: Liquid fertilizer suction port, 13': Small hole. 13": Non-slip holder part, 14: Liquid fertilizer container. 15: Guide rod, 16: Scale plate. 17: Stopper, 20: Lid. 30: Irrigation pump, 32: Groundwater pumping pipe

Claims (1)

[Claims] (1) An air suction prevention device that is connected between a pump for applying liquid fertilizer and a liquid fertilizer container through a drip-type irrigation tube to prevent air from being sucked into the pump during use, comprising: a float chamber connected to the downstream side that can be kept fluid-tight and temporarily stores liquid fertilizer; a suction pipe provided above the float chamber to suck in the liquid fertilizer; an inverted pipe provided in the float chamber that floats up and down. a cup-shaped float can that is freely movable; a discharge pipe provided at the lower part of the float chamber for discharging liquid fertilizer for the purpose of irrigation; a valve seat provided at the upper part of the discharge pipe in the float chamber; ; At a position above the valve seat and between the float can and the valve seat, it is connected to the float can by a lifting line or the like, and the float can moves up and down as the liquid level of the liquid fertilizer in the float chamber moves up and down. a valve body that separates from or seats on the valve seat depending on the movement; an air suction pipe that is provided at the upper part of the float chamber and discharges air from the float chamber and introduces liquid fertilizer into the float chamber upon startup; An air suction pipe and a discharge pipe are connected to the irrigation main pipe through a three-neck cock, and the suction pipe is connected to a liquid fertilizer container; during startup, the air in the float chamber is removed through the air suction pipe. The liquid fertilizer in the liquid fertilizer container is sucked and injected into the float chamber, the liquid level of the liquid fertilizer in the container is raised, the valve body is separated from the valve seat, and the full-scale flow path of the liquid fertilizer passing through the discharge pipe is established. At the same time as forming and continuing watering with liquid fertilizer, close the three-mouth cock, and when the specified amount of liquid fertilizer has been watered,
An air suction device characterized in that when air is sucked into the float chamber, the float moves downward, causing the valve body to sit on the valve seat, thereby preventing air from flowing into the pump. Prevention device.