JPH04923Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a backpack-type power sprayer for spraying chemicals on fields, vegetable gardens, orchards, afforestation areas, etc. The sealing function of the metering valve is achieved by protruding tongues made of a flexible material that are attached and interposed to a plate-shaped body of a predetermined shape, respectively, to the storage tank side and the fan case side. This invention relates to a metering valve for a butterfly-type backpack-type power sprayer that is suitable for dispersing powdered and granular drugs, and is capable of preventing accidental leakage of drugs from a storage tank.

[Conventional technology]

Conventionally, the butterfly-type metering valve of backpack-powered sprayers, which has been widely used for spraying chemicals in fields, vegetable gardens, orchards, afforestation areas, etc., is made of a plate-shaped body made of metal, for example, stainless steel. However, since the sprayed chemicals were mainly relatively coarse granules, a sophisticated sealing function at the boundary between the chemical tank and the pressurized air mixing chamber was not required; There was a gap between it and the inside of the shutter case.

On the other hand, a tank that also serves as a pest control machine has been proposed, which takes into consideration the sealing function at the boundary between the chemical tank 27 and the pressurized air mixing chamber, and also enables spraying of liquid agents in addition to conventional powder and granule agents. are arranged side by side and a gasket 23 is fitted along the periphery of the plate-like body 22, and a sliding body 28 is formed with a slit substantially equal to the plate-like body 22 and slides into contact with the lower surface of the plate-like body 22. A slit type metering valve A is formed, and a sealing plate 24 can be attached and detached via a stud 25 via the packing 23. In the figure, 26 is a nut. (For example, Jikko 58-
(Refer to Publication No. 32759) [Problems to be solved by the invention] In the case of conventional metal metering valves, as mentioned above, the sealing function at the boundary between the chemical tank and the mixing chamber is insufficient; If the medicine falls unexpectedly to
Because of the leakage, it was possible to use it for granular medicines, but it was impossible to use it for powdered medicines. Also, with this type of spreader, during spraying,
A portion of the pressurized air is introduced into the chemical tank to stir the chemical, and even after the metering valve is closed, if the engine is stopped, the pressure inside the chemical tank will rise from both sides in the mixing chamber. This increases the height of the chemical, which causes problems such as promoting leakage of chemicals, and also causing the chemicals to adhere to the inside of the blower due to backflow into the blower, reducing performance and causing corrosion.

In addition, in the case of a metering valve equipped with a gasket, the sealing plate 24 is attached to a gasket 2 that is fitted around the periphery of the plate-like body 22.
3, so there is no problem with liquid tightness, but
For powder and granule drugs, the plate-like body 22 and the plate-like body 2
Since the amount of medicine passing through is adjusted by the overlapping portion of the slit of the sliding body 28 that slides against the lower surface of the slit, it is impossible to spread granules with a particle size larger than the width of the slit.
When the dispersion is closed, the plate-shaped body 22 is caught between the plate-shaped body 22 and the sliding body 28, and the plate-shaped body 22 enters between the sliding body 28 and expands the gap, or sticks and prevents sliding. There were problems in that it was not always possible to obtain a good sealing condition, and it was not possible to handle drugs with a wide range of particle sizes.

[Means to solve the problem]

This idea was devised by focusing on the problems of the prior art described above, and a tongue piece made of a flexible material is integrally fixed to a plate-like body whose support shaft is rotatably supported inside the shutter case. In a metering valve for a backpack-type power spreader, a protrusion is provided on the inner peripheral edge of the shutter case to project inward, and the plate-shaped body is rotatably supported by a pair of support shafts. When one of the pair of tongues to be fixed to the body protrudes toward the storage tank on one side of the support shaft and the other toward the fan case on the other side of the support shaft, and the drug dispersion is stopped, By bringing one side of the tongue piece into close contact with one side of the protrusion, the backpack-type power spreader can prevent accidental leakage of the powder/granule medicine in the storage tank. It attempts to provide a metering valve.

Furthermore, when the engine is stopped, the pressure in the chemical tank and the pressure in the mixing chamber are reversed, and the pressure regulating valve receives force toward the closing side.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 to 3. A shutter case 1 is installed at the lower end of the storage tank T that stores the powdered or granular drug d.
The upper part of the shutter case 1 is fixedly attached to form an integral structure, and a protrusion P that projects inward is formed on a part of the inner peripheral edge of the shutter case 1.

The butterfly type metering valve V has the outer peripheral edge of a plate-shaped body 2 made of metal, for example, stainless steel, facing the protrusion P with a small gap C interposed therebetween.
A pair of tongues 3, 3 (see Fig. 3) made of synthetic or natural rubber or flexible synthetic resin are integrally attached to the outer peripheral edge of the plate body 2 by adhesive or welding. Along the axis a-a, which is the direction, one end of the pair of support shafts S, S is fixed with a fastener j such as a rivet or screw, and the other end of these support shafts S, S is attached to the shutter case 1 with a bearing. (not shown) is rotatably supported in the direction of the arrow shown in FIG.

As shown in FIG. 1, the tongue piece 3 is attached along the outer peripheral edge of the plate-shaped body 2 at one end of the support shafts S (upper side in FIG. 2), for example, on the storage tank T side (fan case 7 side). For example, as shown in FIG. 7 side (can also be the storage tank T side), so that the pair of tongues 3, 3 are in close contact with the upper and lower surfaces of the protrusion P, respectively, when chemical dispersion is stopped (solid line position in Fig. 1). There is.

Further, FIGS. 3b and 3c each show an embodiment in which tongue pieces 4, 4, 5, and 5 having different cross sections are fixed to the outer peripheral edge of the plate-like body 2, and FIG. Although an embodiment is shown in which the entire plate-like body 2 is surrounded and covered by the pieces 6, 6, the manner in which the tongue piece is attached to the plate-like body 2, the protrusion P
Since the manner of contact with the shutter case 1 and the means of supporting the shutter case 1 are the same as those shown in FIG. 3a, their explanation will be omitted.

In the figure, 8 is a fan, 9 is a gasket, and 10 is a drug delivery tube.

[Effect]

Since this device has the above-mentioned configuration, the engine (not shown) is started and the fan 8 is rotated, while the metering valve V is turned in the direction of the arrow in FIG. 1 using the shutter lever (not shown). When the medicine is moved and held at the chain line position, the medicine d in the storage tank T falls through the shutter case 1, passes through the medicine transport pipe 10, and is discharged from the discharge port of the fan case 7 by the pressurized air generated by the fan 8. It passes through parts such as curved pipes, flexible pipes, and spray hoses, and sprays water (none of which are shown).
When spraying is stopped, such as when the spraying operation is completed or temporarily interrupted, when spraying is applied to the target crops such as rice, wheat, fruits, vegetables, seedlings, etc.
The metering valve V is held in the solid line position.

〔effect〕

According to this invention, when the metering valve is closed when the chemical spraying operation is stopped, the residual pressure from the pressurized air introduced into the storage tank during the spraying operation and the own weight of the chemical in the storage tank causes the chemical to accumulate. The tongue on the tank side is brought into close contact with the top surface of the protrusion under pressure, while the tongue on the fan case side is brought into close contact with the bottom surface of the projection under pressure due to the pressurized air from the fan case side. Therefore, unless the metering valve is rotated, the residual pressure of the pressurized air on the storage tank side is maintained as it is. Since the storage tank is pressed into close contact with the upper and lower surfaces of the part and forms a single sealed body, there is no worry that the medicine in the storage tank will accidentally leak or fall into the shutter case. When dispensing is stopped, as is the case with conventional metering valves of this type, it is possible to eliminate the fear of accidental leakage of the drug from the storage tank due to a defective sealing function. In addition, it is possible to avoid the situation where it is impossible to seal the communication passage between the storage tank and the shutter case when powder is used, which is the case with conventional metering valves that have a gasket attached to a plate-shaped body. Both granular and granular forms can be used.
The user is freed from the hassle of selecting the type of sprayer to be used according to the type of chemical, and the structure of the metering valve itself is not particularly complicated compared to conventional ones. It is robust and can be produced at low cost, can withstand long-term use, and has practical benefits for users, such as avoiding unnecessary economic burdens.

The above explanation is an example that is applicable to powdered/granular chemicals, but it is also applicable when spraying fertilizers.

[Brief explanation of drawings]

Figure 1 is a partially cutaway vertical cross-sectional view of the essential parts of a backpack-type power spreader equipped with this product, Figure 2 is a plan view of the product, and a, b, c, and d in Figure 3 are 2 is a sectional view of a different embodiment taken along the - line in Fig. 2, Fig. 4 is a longitudinal sectional view of the main part near the metering valve of a conventional backpack-type power spreader, and Fig. 5 is a perspective view of the metering valve. . P...Protrusion, S...Spindle, T...Storage tank, V
... Metering valve, 1... Shutter case, 2... Plate body, 3, 4, 5, 6... Tongue piece, 7... Fan case.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Adjustment of a backpack-type power spreader in which a tongue piece made of flexible material is integrally fixed to a plate-like body whose support shaft is rotatably supported inside the shutter case. In the volume valve, a protrusion P is provided on the inner peripheral edge of the shutter case 1 to project inward, and is rotatably supported on the plate-like body 2 by a pair of support shafts S, S. One of the pair of tongues 3, 4, 5, and 6 to be fixed to the support shafts S, S protrudes toward the storage tank T side on one side, and the other protrudes toward the fan case 7 side on the other side of the support shafts S, S, respectively. Metering of a backpack-type power sprayer in which one side of the tongue pieces 3, 4, 5, 6 and one side of the protrusion piece P are brought into close contact when the spraying of the medicine is stopped. valve. (2) The tongue pieces 3, 4, and 5 are placed along the outer periphery of the plate-shaped body 2.
A metering valve for a backpack-type power spreader according to claim 1 of the established utility model registration claim. 3. The metering valve for a backpack-type power spreader according to claim 1, wherein the tongue piece 6 covers and surrounds the plate-like body 2.