JPH03197823A - Quantitative discharging device for fluid - Google Patents

Abstract

PURPOSE:To discharge fluid effectively, repeatedly, and quantitatively by providing a fluid supply means which supplies simultaneously the fluid having the same pressure to a 1st and a 2nd flow passage and a selector valve mechanism which switches and communicates the 2nd flow passage and a discharge port on a 2nd cylinder internal chamber. CONSTITUTION:When a lever 19 is gripped and rotated counterclockwise around a pin 20a, a valve body 11 moves down and comes in contact with a valve seat 13a to close a valve opening 14a, leaves a valve seat 13b to open a valve opening 14b, and allows the inside of the 2nd cylinder internal chamber 1b to be communicated with a discharge port 2C through an intake and outlet 2b. The inside of the internal chamber 1b is shielded from the high pressure in a communication pipe 9 and opened (reduced) to an atmosphere. At this time, the high pressure in a chemical supply path operates on the inside of a 1st cylinder internal chamber 1a, so the pressure in the internal chamber 1b becomes lower than the pressure in the internal chamber 1a and a piston 3 moves toward the internal chamber 1b with the pressure difference to send chemicals in the internal chamber 1b from the outlet 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fixed-quantity dispensing device capable of discharging a fixed amount of fluid at any time.

The device of the present invention, for example, sprays a contact-type armpit bud inhibitor that suppresses the armpit buds that occur on the roots of tobacco leaves in a fixed amount on each tobacco trunk, and applies too much or too little of the inhibitor to the armpit buds. It can be effectively used to ensure contact without any problems.

[Prior art] In tobacco cultivation, it is necessary to suppress the development of armpit buds in order to ensure that sufficient nutrients are supplied to the harvested leaves, and for this reason, contact-type armpit bud inhibitors are used. has been done. This type of inhibitor is harmful to plants if used in excess of the necessary amount, so a constant supply is required. Conventionally, this type of quantitative supply of chemical liquids was performed by opening a manual valve interposed between the chemical liquid supply source and the discharge nozzle for a predetermined period of time, but in this case, the amount valve time was determined by the operator. This was done based on his intuition.

[Problems to be Solved by the Invention] In the above-mentioned conventional method, the amount of chemical solution supplied depends on the operator's intuition, which causes variations in the amount supplied, and the work requires skill and experience. .

[Means and operations for solving the problem] The present invention has been proposed to solve the above-mentioned problems, and includes a cylinder, and a first and second cylinder whose volume increases and decreases in the opposite manner to each other in the inner space of the cylinder. A piston defined in a second cylinder interior chamber and having an axial pressure receiving end surface having a relatively small area and a relatively large area facing each of the first and second cylinder interior chambers, and defining a stroke of the piston. a first flow path communicating with the first cylinder inner chamber; and a first flow path communicating with the first cylinder inner chamber;
a second flow path that communicates with the cylinder inner chamber; a discharge port that communicates with the second cylinder inner chamber and is open to the atmosphere; and a fluid supply means that simultaneously supplies the same pressure fluid to the first and second flow paths. and a switching valve mechanism that selectively connects the second flow path and the discharge port to the second cylinder inner chamber.

When fluid of the same pressure is supplied from the fluid supply source to the inner chambers of both cylinders through the first and second flow paths while the switching valve communicates the second flow path with the second cylinder inner chamber, both cylinders The fluid that has flowed into the inner chamber acts on both pressure-receiving end surfaces of the piston.
The piston is pushed toward the cylinder interior and stopped by the piston stroke regulating means, and at this time, the second cylinder interior, which has a larger pressure-receiving end area of the piston, is filled with fluid. In this state, when the switching valve mechanism is operated to shut off the second flow path from the second cylinder inner chamber filled with the fluid, and to switch the second cylinder inner chamber into communication with the discharge port, the discharge port Since it is open to the atmosphere, the pressure inside the second cylinder decreases, and due to the pressure of the fluid from the supply source acting on the piston pressure receiving end face facing the first cylinder interior on the opposite side of the piston, The piston is pushed back toward the reduced pressure in the second cylinder, causing the fluid in the second cylinder to be discharged from the discharge port.

When the discharge is completed, the switching valve is returned to its original state by, for example, a return spring, thereby blocking the second cylinder interior from the discharge port and communicating it with the second flow path. This allows the second
Fluid flows from the supply source into the second cylinder interior through the flow path. By this time, the fluid from the supply source has already flowed into the inner chamber of the other first cylinder through the first flow path in the previous discharge process, and the piston in the former second cylinder inner chamber is filled with fluid. Since the area of the pressure receiving end face is larger than the area of the pressure receiving end face of the piston facing the inner chamber of the first cylinder, the fluid flowing into and filling the second piston inner chamber moves the piston toward the inner chamber of the first cylinder, thereby defining the piston stroke. stopped by means.

By providing the switching valve mechanism with a manual switching lever extending outside the cylinder and extending along the cylinder, manual switching of the valve can be easily performed. Further, by making the piston stroke regulating means adjustable in displacement, it is possible to change the piston stroke and change the maximum volume of the second cylinder interior, that is, the amount of fluid discharged by -times of piston movement.

[Example] The illustrated embodiment will be described in detail below.

In the figure, 1 is a cylinder, 2 is a closing fitting screwed onto one open end of the cylinder 1, 3 is a piston fitted into the cylinder 1 so as to be able to slide back and forth, and 4 is a piston stroke that defines the piston stroke. The regulating means, in the illustrated example, consists of a seal collar fitted to the other open end of the cylinder 1. A piston rod 5 passes through the seal collar 4 and projects outward from the cylinder 1. la and lb are first and second cylinder inner chambers partitioned by the piston 3, and the volumes of the inner chambers ta and lb increase and decrease in opposite manners due to the sliding displacement of the piston 3.

6 is an axial flow passage provided through the piston rod, 7 is a radial flow passage that opens the flow passage 6 into the inner chamber 1a near the piston 4, and 8 is screwed to the outer end of the piston rod 5. It is a T-shaped branching fitting, one end of which passes through the passage 8a is connected to a liquid supply pump (not shown) via a suitable communication pipe (not shown), and the other end is connected to the axial passage 6 of the piston rod 5. , the branch passage 8b is connected to the inlet 2a provided in the closing fitting 2 of the cylinder 1 via a flexible connecting pipe 9.

2b is an outflow inlet provided in the closing fitting 2 to the second cylinder inner chamber 1b; 2C is a discharge port provided in the closing fitting 2; 10 is a three-way valve incorporated in the closing fitting 2; is selectively connected to the inflow port 2a and the discharge port 2C. Reference numeral 11 denotes an abacus-shaped valve body constituting the three-way valve 10, and has a double-sided conical portion 11a and a double-sided pillar portion 11b. 12 is a valve stem formed integrally with the valve body 11, 13a is a valve seat on the inflow port 2a side, and 13b is a valve seat on the discharge port 2C side, each having valve ports 14a and 14b. 15 is both valve seats 13a, 13b
A collar that defines a valve chamber 16 in which the valve body 11 is housed.
Reference numeral 15a denotes a communication port bored in the collar 15, which communicates the valve chamber 16 with the outflow inlet 2b to the second cylinder inner chamber 1b. Reference numeral 17 denotes a gland for fixing the three-way valve to the opening fitting 2, and the valve stem 12 projects outward from this gland 17. 1
8 is a coil spring wound around the valve stem, which connects the valve body 11 to the valve seat 1.
3b side to close the discharge port 2C,
The inflow port 2a is communicated with the outflow port 2b.

A pin 20a 19 is attached to a support portion 2d formed on the closing fitting 2.
The tip 19a of the operating lever is pivotally attached to the bin 20b.
The handle portion 19b is pivotally attached to the tip of the valve stem 12, and the handle portion 19b extends along the cylinder 1. Handle part 1 of lever 19
9b and rotate the lever 19 counterclockwise around the pin 20a as shown in the figure, the valve stem 12 compresses the coil spring 18 and is pulled downward as shown in the figure, causing the valve body 11 to move toward the valve opening 14.
b is opened to communicate the discharge port 2C with the outflow inlet 2b, and the valve port 14a is closed.

21 is a set screw screwed into the seal collar 4 through a slot 22 provided in the peripheral wall of the cylinder 1;
By loosening the screw to displace the seal collar 4 in the axial direction of the cylinder 1 and tightening the screw 21 again, the position of the seal collar 4 can be adjusted, and the maximum capacity (i.e., discharge amount) of the second cylinder inner chamber 1b can be changed. .

Fig. 2 shows a state in which the operating lever is squeezed and the chemical liquid in the second cylinder inner chamber 1b is being discharged from the discharge port 2C, but the piston 3 is pushed a little further to the left and the opening fitting 2 flows out. When the lever 19 is released when all the chemical liquid in the second cylinder inner chamber 1b has been discharged in contact with the inlet 2b, the chemical liquid from the chemical liquid supply source flows through the piston rod 5 via the diverter fitting 8. The chemical liquid that has already flowed into the first cylinder inner chamber 1a from the radial flow path 7 through the path 6, but is supplied from the branch flow path 8b through the communication pipe 9, flows from the inlet 2a of the closing fitting 2 into the valve. It flows into the second cylinder inner chamber 1b from the outflow inlet 2b through the 10 open valve ports 14a.

Although the fluid pressures in the cylinder inner chambers 1a and 1b are equal, the pressure receiving surface 3b on the inner chamber 1b side of the piston 3 is the same as the pressure receiving surface 3b on the inner chamber 1a side.
Since the area is larger than a, the piston 3 is pushed toward the ia side of the first cylinder interior (to the right in FIG. 1) and stops against the seal collar 4. At this time, the second cylinder inner chamber 1b is filled with the chemical solution (FIG. 1).

When the lever 19 is grasped and rotated counterclockwise around the bottle 20a from the state shown in FIG. The valve port 14b is opened by leaving the seat 13b, and the inside of the second cylinder inner chamber 1b is communicated with the discharge port 2C via the outflow port 2b. Therefore, the inside of the second cylinder internal chamber 1b is cut off from the high pressure in the communication pipe 9 and is opened to the atmosphere (depressurized). is acting, the pressure inside the second cylinder interior chamber 1b becomes smaller than the pressure inside the first cylinder interior chamber 1a, and this pressure difference causes the piston to move toward the second cylinder interior chamber 1b.
side, and the chemical liquid in this cylinder inner chamber lb is discharged from the discharge port 2.
Send from C.

- As described above, by changing the axial position of the seal collar 4 in the cylinder 1, the maximum volume of the second cylinder inner chamber 1b, and therefore the discharge amount of the chemical solution, can be changed.

Moreover, by changing the area ratio of the pressure receiving surfaces 3a and 3b of the piston 3, the discharge time of the chemical liquid in the second cylinder inner chamber 1b can be changed.

When the discharge is completed and the lever 19 is released, the repulsive force of the coil spring 18 causes the valve body 11 to move upward, closing the valve port 14b leading to the discharge port 2C and opening the valve port 14a to open the inlet port 2a. It communicates with the outflow inlet 2b of the second cylinder inner chamber 1b, and the above-described operation is repeated.

In the illustrated embodiment, the seal collar 4 that defines the stroke of the piston 3 is movable and the piston stroke is variably adjusted. A configuration in which the piston stroke is variably adjusted by displacement is also possible.

Further, an inlet to the first cylinder inner chamber 1a and an outlet from the inner chamber 1a are provided on the side wall of the cylinder 1, and a fluid supply source is connected to the inlet, and a communication pipe 9 is connected to the outlet. A configuration is also possible. According to this configuration, the flow path 6.7 in the piston rod and the diverter fitting 8 are unnecessary,
Further, the communication vibrator 9 may not be flexible and may be short. However, in this configuration, the first position is at the maximum protrusion position of the piston rod.
Ensure that the minimum volume of the cylinder inner chamber 1a does not become zero,
At this time, it is necessary to provide an inlet from the fluid supply source and an outlet to the communication pipe 9 at a position communicating with the first cylinder inner chamber 1a.

Fig. 4 shows the discharge port 2c of the device A of the present invention, which was applied to
31095 is a diagram showing a state in which the spraying device B of No. 31095 is connected and the axillary bud inhibitor is sprayed in a fixed amount.

It goes without saying that the device of the present invention can be used for purposes other than dispensing a fixed amount of backing medicine.

[Effects of the Invention] As described above, according to the present invention, it is possible to effectively repeatedly discharge a fixed amount of fluid with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention; Figure 2 is a diagram similar to Figure 1 but showing different operating positions; Figure 3 is a partially enlarged view, FIG. 4 is a diagram showing an example of use. 1... cylinder, 1a...first cylinder inner chamber, 1b...second cylinder inner chamber, 2...Closing metal fittings, 2a... inlet, 2b... Outflow inlet, 2C...discharge port, 3...Piston, 4...Seal color 5... Piston rod, 6... Axial flow path, 7... Radial flow path, 9...Connecting pipe, 10... Three-way valve.

Claims (3)

[Claims] (1) A cylinder, and the cylinder interior space is divided into first and second cylinder interior chambers whose volumes increase and decrease in an opposite manner to each other, and a relatively small area facing each of the first and second cylinder interior chambers. and a piston having an axial pressure-receiving end surface with a relatively large area; a piston stroke regulating means for regulating the stroke of the piston; a first passage communicating with the first cylinder inner chamber;
a second flow path that communicates with the cylinder inner chamber; a discharge port that communicates with the second cylinder inner chamber and is open to the atmosphere; and a fluid supply that simultaneously supplies fluid at the same pressure to the first and second flow paths. A fixed-quantity discharge device for fluid, comprising: means; and a switching valve mechanism that selectively connects the second flow path and the discharge port to the second cylinder interior chamber. (2) The fluid metering discharge device according to claim 1, wherein the switching valve mechanism includes a manual operation lever arranged along the cylinder. (3) The fixed-quantity discharge device for fluid according to claim 1 or 2, wherein the piston stroke regulating means is capable of changing and adjusting the piston stroke.