JPH0448838Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention consists of a casing that houses a valve, a restraining member with a bulging piece, and a compression spring, and a lid body with a through hole through which the restraining member passes. The present invention relates to a pressure converter for a human-powered sprayer, in which a pressure regulator is attached to the upper side edge of the chemical tank, and the pressure in the chemical tank can be changed to either high or low by changing the setting position of the suppressing member to the housing. It is something.

[Conventional technology]

In conventional pressure accumulation type manual sprayers, before spraying the chemical, a piston pump pressurizes the air in the chemical tank, and this pressurized air pushes the chemical toward the hose. The pressure of the air is
As the chemical solution gradually decreases as it is released to the outside, it is necessary to keep the pressure at the beginning of accumulation under high pressure. However, from the viewpoint of pressure resistance of the chemical solution tank, it is necessary to set a safety valve so that the specified pressure is not exceeded, or to prevent the liquid from exceeding the specified pressure. A pressure gauge is installed to display the required pressure depending on the amount.

[The problem that the idea attempts to solve]

In the above-mentioned pressure accumulation type manual sprayer, high pressure means approximately 1 Kgf/cm ² or more, but when the ratio of the chemical liquid amount to the air chamber volume is 2:1, all of the chemical liquid is under high pressure. In order to release the chemical from the tank, the pressure at the beginning of accumulation must be at least 5 kgf/ ^cm2 , and when used at a pressure of 1 kgf/ ^cm2 or less for low pressure, the volume of the chemical must be at least the same as the air volume. can be,
Since the usable amount of the chemical liquid is small compared to the capacity of the chemical liquid tank, the overall size of the chemical liquid tank is forced to be unreasonably large, which is inconvenient to handle, and moreover, it requires a wasted setting space. It is also possible to spray while pressurizing air at all times, but since the safety valve is designed for high pressure, the operator is forced to operate the piston while always paying attention to the pressure, which is inconvenient for the operator. It has drawbacks such as causing unnecessary stress.

This idea was proposed by focusing on the above-mentioned drawbacks, and its purpose was to easily change the pressure inside the chemical tank to either high or low levels as needed, making it possible to perform both high and low spraying using human power. The present invention aims to provide a pressure conversion device for a sprayer.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the pressure conversion device of the manual sprayer in this invention consists of a piston rod with a piston attached to one end and a gripper attached to the other end, in a cylinder that communicates with the chemical liquid tank through a guide valve. In a manual sprayer that pressurizes the air in the chemical liquid tank by lifting and lowering it, and that is attached to the side edge of the chemical liquid tank with a pressure regulator that maintains the air under a predetermined pressure, a protrusion that protrudes outward from the upper side edge of the chemical liquid tank. A second through hole is bored in the upper end of the lid that is screwed to the outer peripheral edge, and a supporting piece is fixed to the lower end of the column from which the bulging piece can be projected, which can pass through the second through hole depending on the set position, and this A housing in which a support piece is inserted through a small groove is sandwiched and fixed between the protrusion and the lid, and this support piece is placed between the valve that opens and closes the first passage hole drilled in the lower end of the housing. It is made up of a compression spring that springs and biases the valve toward the first passage hole.

〔Example〕

An embodiment of this invention will be described with reference to FIGS. 1 to 5. The reduced diameter part r at the center of the upper end of the chemical solution tank T
A fitting part 2 hanging down inside the cap A is screwed onto a base 1 fixed to the outer peripheral edge of the cap A by welding or the like, while a holding piece 3 having a U-shaped cross section is bored in the center of the cap A at the lower end A gripping body 5 is fixed to the upper end of a piston rod 4 that passes through the through hole i so as to be able to rise and fall freely, and the gripping body 5
can be placed on the upper surface of the cap 4, while bending the upper end of the cylinder 7 into which the piston 6 attached to the lower end of the piston rod 4 is slidably and tightly fitted, and inserting this bent piece b into the cap. It is clamped and fixed between the horizontal part of the upper end of A and the reduced diameter part r via the packing P,
In addition, the lower end of the cylinder 7 has a through hole h for air discharge.
A guide valve 8 is installed through the cavity S, and as the piston 6 moves up and down, the air pressurized by the cylinder 7 is discharged into the chemical liquid tank T, pressing the chemical liquid d.
can be sprayed from a nozzle J via a liquid feeding hose 20 and a liquid feeding pipe 10 having a pot 9 interposed therebetween.

A male screw 1 is attached to the outer peripheral edge of a protrusion 11 that protrudes on one side of the upper side edge f of the chemical solution tank T (left side in FIG. 1).
A rectangular second through hole C, C is bored in the center of the upper part of the lid body 13, which has a U-shaped cross section and has a female screw screwed onto the male screw 12. The cross section with bulging pieces e and e (described later) that can pass through the U
A letter-shaped restraining member k (support piece 14, pillar 19 described later)
A supporting piece 14 is fixed to the lower end of the housing 15 (including 13 and the upper end of the protruding part 11 via an "O" ring W, the valve 17 is sandwiched and fixed, and the valve 17 faces the first through hole 16 bored at the lower end of the housing 15 so as to be openable and closable, and the supporting piece 14 A compression spring 18 is tensioned between the support piece 14, and when used for high pressure (described later), the valve 17 is always resiliently biased toward the first through hole 16 side. Rectangular bulging pieces e, e are fixed and protruded at symmetrical positions on the outer peripheral edge of the fixed and upright support column 19, and these bulging pieces e, e are allowed to pass through the second through holes C, C, and As shown in FIG. 4, the upper end of the support column 19 is provided with a groove n perpendicular to the bulges e, into which a tool such as a screwdriver can be inserted. Therefore, when the groove n of the support column 19 is parallel to the second through holes C, C, the bulging pieces e, e are at right angles to the second through holes C, C as shown in FIG. bulging piece e,
The upper end of e is in contact with and restrained by the lower surface of the lid body 13, and therefore the compression spring 18 is resiliently directed downward by the support piece 14.
The valve 17 is energized, and the first passage hole 16 is closed and held under high pressure. Further, when a tool such as a screwdriver is inserted into the groove n and the support 19 is rotated to make the groove n perpendicular to the second through holes C, C as shown in FIG. , e is the second through hole C, C
, the support piece 14 passes through this area and protrudes upward, and the support piece 14 rises together and comes into contact with the lower surface of the lid 13.
Since the compression spring 18 is restrained, the compression spring 18 is expanded within the housing 15, and the valve 17 is closed and maintained under low pressure with respect to the first passage hole 16. That is, the housing 15 of the holding member k
By switching the set position at , the valve 17 can be placed under either high pressure or low pressure with respect to the first passage hole 16 . In addition, the second through hole C, the lid body 13 with C, the housing 15, the first through hole 16, the valve 17, the compression spring 18,
The pressure regulator M including the holding member k and the groove q is referred to as a pressure regulator M.
In the figure, 21 is a stopper for the liquid feeding pipe 10.

[Effect]

In this design, (i) when spraying fungicides, insecticides, etc., it is necessary to set the inside of the chemical solution tank T under high pressure so that it is sprayed as fine particles from the nozzle J, so the pressure regulator M The restraining member k is placed in the position shown in FIG. 2 with respect to the housing 15, and the compression spring 18 is set under high pressure by the support piece 14. Under this condition, when the piston 6 is moved up and down within the cylinder 7 in FIG. 1, air passes through the guide valve 8, accumulates in the chemical tank T, and gradually becomes high in pressure. The chemical solution d is pressed by this high-pressure air, and when the pot 9 is opened, it is sprayed from the nozzle J to a desired area. However, when the pressure in the chemical tank T exceeds the specified value, the valve 1 of the pressure regulator M
7 is pushed up against the elastic force of the compression spring 18, and when the first through hole 16 is opened, air is released to the outside from the second through holes C and C through the groove q, and the chemical solution tank is placed under abnormally high pressure. T
It is possible to prevent this from occurring. () When spraying herbicides, if sprayed from nozzle J, it will scatter and adhere to other crops, causing damage, so it is best to make the mist coarse or spray it in liquid form. Therefore, it is necessary to set the inside of the chemical liquid tank T under low pressure. Therefore, insert a tool such as a screwdriver into the groove n of the holding member k of the pressure regulator M, and rotate the support 19 counterclockwise (or clockwise) as shown in FIG. When n is placed perpendicular to the second through holes C, C, the bulging pieces e, e are placed in positions that coincide with the second through holes C, C, so that the compression springs 18 and the second through holes C,
C and is placed in the state shown in FIG. 4, the compression spring 18 is expanded and the force pressing the valve 17 against the first through hole 16 is lower than in the case () above, resulting in a so-called low pressure state. becomes. That is, the air in the chemical liquid tank T is set to a low pressure, and under this condition, the piston 6 is moved up and down, and the chemical liquid d in the chemical liquid tank T is sequentially sent to the nozzle J side and sprayed on the desired area. .

〔effect〕

According to this invention, when the pressure regulator is set to the high pressure side via the restraining member, pressure is accumulated in the chemical liquid tank by raising and lowering the piston, just like in conventional manual sprayers, and the chemical liquid is released using air under high pressure. Sterilize by pressing
It can perform spraying suitable for killing insects, etc., and when setting the pressure regulator to the low pressure side by changing the setting position on the housing of the suppressor, the force required to operate the piston to raise and lower is less than that of a conventional sprayer. The pressure required by the piston is less than that required, making it easier to apply pressure with the piston. Also, unlike during high-pressure spraying, there is no need to temporarily accumulate pressure in the chemical tank, so the air chamber volume is almost zero. Therefore, the entire volume of the chemical liquid tank can be used as the amount of liquid necessary for spraying, the size of the container can be easily selected, and there is no fear that the pressure will increase more than necessary due to the lifting and lowering of the piston. Since the pressure regulator itself is attached to the upper side edge of the chemical liquid tank, when the cap is removed from the chemical liquid tank, the bulging piece constituting the suppressing member of the pressure regulator is leaked from the second through hole at the upper end of the lid body. The pressure setting status in the chemical tank can be immediately confirmed by visual inspection to see if it is protruding, and the operator can easily select the level of air pressure applied to the object to be sprayed, making handling convenient. Even if the air in the chemical solution tank rises abnormally due to heat from the outside air or heat, the first vent automatically opens and flows out to the atmosphere from the second vent through the groove inside the housing, so the chemical solution tank itself Because there is no risk of accidental damage,
While it is safe to use, there is no need to make the chemical tank unnecessarily strong or thick, which saves on materials, and it is easy to switch between high and low pressures in the chemical tank. Furthermore, unnecessary complication of the overall structure can also be avoided.

[Brief explanation of the drawing]

The drawings show an example of the proposed product. Figure 1 is a partially cutaway vertical cross-sectional view of a chemical tank equipped with the proposed product, and Figure 2
The figure is a longitudinal cross-sectional view of the present product when the pressure is set to high, FIG. 3 is a plan view of the main part of the same as above, FIG. 4 is a longitudinal cross-sectional view of the present product when the pressure is set to low, and FIG. c...Second through hole, M...Pressure regulator, T...chemical tank, e...bulging piece, f...upper side edge, q...
Groove, 4... Piston rod, 5... Gripping body, 6... Piston, 7... Cylinder, 8... Guide valve, 1
1...Protrusion part, 13...Lid body, 14...Bearing piece,
15... Housing, 16... First through hole, 17... Valve,
18... compression spring, 19... strut.

Claims (1)

[Scope of utility model registration request] Inside the cylinder, which communicates with the inside of the chemical liquid tank through a guide valve, the air inside the chemical liquid tank is pressurized by raising and lowering a piston rod, which has a piston attached to one end and a gripper attached to the other end, and the air is kept under a predetermined pressure. In a manual sprayer in which a pressure regulator to be held is attached to the side edge of the chemical liquid tank, a second through hole is bored in the upper end of the lid that is screwed onto the outer periphery of the protruding part that protrudes outward from the upper side edge of the chemical liquid tank. , fixing a support piece to the lower end of the column from which a protruding piece that can pass or not pass through the second through hole depending on the set position;
A housing in which this support piece is inserted through a small groove is sandwiched and fixed between the protrusion and the lid, and between the support piece and a valve that opens and closes a first passage hole drilled in the lower end of the housing, A pressure conversion device for a manual sprayer is provided with a compression spring that urges and urges this valve toward the first passage hole.