JPH10156253A - Dispenser apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the repeated response of the emission of a liquid and the stop of the emission thereof and to certainly prevent the liquid dripping from the leading end of a nozzle by inserting a suction rod into a valve disc in a slldable manner and forming a negative pressure state within a nozzle main body accompanied by the sliding of the suction rod. SOLUTION: A pressure liquid is always introduced up to a liquid inflow port 12 and, when compressed air is introduced into a ventilation port 41 through a changeover valve 95, a valve disc piston part 35 (valve disc 30) is pushed up by compressed air and the pressure liquid is emitted from the nozzle tip orifice 28 of a nozzle main body 20. Thereafter, the changeover valve 95 is changed over and, when compressed air is discharged to the outside from the ventilation port 41, the valve disc piston part 35 is allowed to fall by a compression spring 48. At the same time, compressed air is introduced into a ventilation port 61 and a suction piston part 55 is pushed up and the liquid chamber 27 of the lower part of a suction rod 50 becomes negative in pressure and the residual liquid suspended from the nozzle tip orifice 28 is sucked into the nozzle main body 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-viscosity liquid such as high-viscosity silicone oil, starch syrup and honey.
The present invention relates to a dispenser device for dispensing a fixed amount of liquid of about 000 to 100,000 cP).

[0002]

2. Description of the Related Art Conventionally, a dispenser device as shown in FIG. 4 has been known as a general device for discharging a fixed amount of liquid. That is, the dispenser apparatus 100 shown in FIG. 4 includes a discharge nozzle 102, a syringe 101 for storing the liquid L to be discharged, and a lid 105 attached to the upper end of the syringe 101. A pressure chamber 104 is formed in the upper space of 101.

Further, the pressure chamber 104 is connected to an air control device 107 through a conduit 108. The air control device 107 can alternately supply a positive pressure and a negative pressure to the pressure chamber 104 at a constant cycle, and when the positive pressure is supplied to the pressure chamber 104, the liquid L in the syringe 101 is discharged from the discharge nozzle 102. When the negative pressure is supplied to the pressure chamber 104, the supply of the liquid L is stopped, and unnecessary dripping from the tip of the discharge nozzle 102 is prevented until the next positive pressure supply. Care has been taken to be able to

However, the above-mentioned apparatus is not particularly intended for discharging a high-viscosity liquid. Therefore, if the above-mentioned conventional apparatus is simply applied to a high-viscosity liquid, the liquid level is increased at a considerably high pressure for discharging. There arises a need to pressurize or further increase the discharge nozzle diameter. In this case, when the pressure in the pressure chamber 104 is set to a negative pressure after the discharge, it is not possible to instantaneously stop the discharge with good responsiveness or to prevent the liquid dripping, and it is extremely difficult to guarantee the quantitativeness of the discharge. is there. Further, if the degree of the negative pressure is made extremely large in order to improve the responsivity of repeatedly discharging and stopping the liquid, problems such as generation of bubbles from within the liquid L may occur.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a simple and compact apparatus, which can provide a liquid discharge and stop repetitive response. It is an object of the present invention to provide a dispenser device which can prevent liquid dripping from the nozzle tip extremely reliably and which has excellent discharge quantitativeness.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a valve element which is provided so as to be able to contact and separate from a valve seat for discharging and stopping a pressurized liquid. A suction rod slidably inserted into the valve body to prevent liquid dripping, and a nozzle body for discharging liquid, and the inside of the nozzle body along with the sliding of the suction rod. It is configured such that a negative pressure state is formed.

In a preferred aspect of the present invention, the valve body has a valve body piston portion, and the valve body can be moved toward and away from a valve seat with the stroke movement of the valve body piston portion. Is provided with a suction piston portion, and a negative pressure state is formed inside the nozzle body with the stroke movement of the suction piston portion, so that liquid dripping at the tip of the nozzle body can be prevented.

In a preferred aspect of the present invention, the valve piston and the suction piston are arranged in series in the axial direction, and the valve piston is arranged at a position close to the nozzle body. It is composed.

In a preferred aspect of the present invention, a stroke adjusting mechanism is further provided so as to adjust a stroke moving distance of the suction piston portion.

In a preferred aspect of the present invention, a liquid-tight member for forming a liquid-tight member is provided on a sliding surface between the valve member and a suction rod provided inside the valve member. Be composed.

In a preferred aspect of the present invention, the liquid to be discharged is introduced into the apparatus in a pressurized state, and a negative pressure state is formed inside the nozzle body at the same time when the valve is closed. In addition, the valve piston and the suction piston are driven synchronously.

[0012]

Embodiments of the present invention will be described below in detail.

FIG. 1 shows a preferred embodiment of the dispenser device of the present invention.

As shown in FIG. 1, a dispenser device 1
A liquid inflow hole 12 is formed on a lower side surface (right side of the drawing) of the apparatus, and a liquid (hereinafter simply referred to as a “pressurized liquid”) that is pressurized so as to be quantitatively discharged into the apparatus through the liquid inflow hole 12 ] Is introduced. In the present embodiment, a liquid storage chamber 13 is provided so as to communicate with the liquid inflow hole 12 in order to ensure the stability of liquid discharge.

Furthermore, at a position below the liquid inlet hole 12,
Nozzle body 20 for discharging pressurized liquid as shown
Are formed. The nozzle main body 20 includes a cylindrical liquid chamber 27 occupying a small volume therein and a nozzle tip hole 28 communicating with the liquid chamber 27. In the embodiment of the present invention, the ring-shaped upper edge portion of the liquid chamber 27 forms the valve seat 21.

In the axial direction of the dispenser device 1 of the present invention, a valve body 30 for discharging and stopping the pressurized liquid is formed. The valve body 30 has a tapered portion 33 provided with a seal valve mechanism at the tip thereof (constitutes the valve mechanism with the valve seat 21), and a valve body piston 35 is formed at the rear of the valve body 30. This valve body piston portion 35
Is slidably installed in the cylinder 40.

On the side surface of the cylinder 40, ventilation ports 41 and 43 are arranged in the vertical direction with reference to the valve body piston 35 as shown in the figure. As shown in the figure, when the compressed air supplied from the pressure source 90 enters the ventilation port 41 side via the switching valve 95 (in the direction of the arrow (a)), the valve body piston portion 35 (the valve body 30) is compressed by a compression spring. 48 is lifted above the drawing overcoming the urging force of 48, and the valve mechanism formed by the valve body 30 and the valve seat 21 is in an "open" state,
A predetermined amount of pressurized liquid is discharged from the nozzle tip hole 28 of the nozzle body 20 (the state of FIG. 2).

On the other hand, when the switching port 95 switches the ventilation port 41 to the exhaust side (compressed air in the cylinder is exhausted in the direction of arrow (b)), the valve piston 3
5 (valve element 30) is pushed in the direction of arrow A by the compression spring 48, and the valve mechanism is brought into the "closed" state (the state of FIG. 1). That is, with the stroke movement of the valve body piston portion 35,
The tapered portion 33 at the tip of the valve body 30 can come into contact with or separate from (separate from) the valve seat 21 formed on the nozzle body 20 side. As described above, when the tapered portion 33 at the tip of the valve body 30 comes into contact with the valve seat 21, the valve mechanism formed by the valve body 30 and the valve seat 21 is in a “closed” state, and the nozzle body of the pressurized liquid is The discharge from the nozzle 20 is stopped.

Further, in the present invention, there is provided a suction rod 50 slidably inserted inside the valve body 30 to prevent liquid dripping. A liquid-tight member such as an O-ring 51 is interposed at the distal end of the suction rod 50 in order to maintain the liquid-tight property on the sliding surface when the object slides inside the valve body 30. Preferably. This is for surely executing the action of preventing liquid dripping as described later.

A suction piston 55 is formed at the rear of the suction rod 50.
Is slidably installed in the cylinder 60. On the side surface of the cylinder 60, ventilation ports 61 and 63 are arranged in the vertical direction with respect to the suction piston 55, respectively. As shown in the figure, when the compressed air supplied from the pressure source 90 enters the ventilation port 61 side via the switching valve 95 (in the direction of the arrow (c)), the suction piston 55 (the suction rod 50) is compressed by the compression spring 68. 3 is lifted upward in the drawing (the state of FIG. 3), and the volume V corresponding to the movement of the distal end of the suction rod 50 causes the communicating liquid chamber 27 to be in a negative pressure state, and the nozzle distal end hole 28 The liquid acts to suck and hold the liquid to be dripped (liquid dripping prevention action).

On the other hand, when the switching port 95 switches the ventilation port 61 to the exhaust side (compressed air in the cylinder is exhausted in the direction of the arrow (d)), the suction piston 5
5 (suction rod 50) is pushed in the direction of arrow B by the compression spring 68 and returns to the state of FIG.

In the present invention, as can be seen from the configuration shown in FIG. 1, the valve body piston portion 35 and the suction piston portion 55 are arranged in series in the axial direction, and the valve body piston portion 35 is By arranging it at a position close to the nozzle body 20, the size of the apparatus can be reduced, which is convenient.

In the present invention, it is preferable to further provide a stroke adjusting mechanism such as a stopper adjusting screw 70 so that the stroke moving distance of the suction piston portion 55 can be adjusted. This makes it possible to finely adjust the suction pressure for preventing liquid dripping.

Next, the operation and operation of the above-described dispenser device 1 of the present invention will be described.

In FIG. 1, pressurized liquid is always introduced up to the liquid inflow hole 12 through a pipe from a not-shown pressurized tank or the like. At this time, if the valve mechanism is in the "closed" state as shown in FIG. 1, the ejection of the pressurized liquid from the nozzle body 20 is stopped.

Next, when compressed air is introduced into the ventilation port 41 (in the direction of the arrow (a)), the compressed air pushes up the valve body piston portion 35 (valve body 30), and the valve body 3
The tapered portion 33 at the leading end of the valve body 21 is separated from the valve seat 21 and the valve mechanism is in an “open” state, and the pressurized liquid is supplied to the nozzle body 2.
No. 0 is discharged from the nozzle tip hole 28 (the state of FIG. 2).

After the discharge for a certain period of time is performed, the switching valve 95
Is switched, the compressed air is discharged from the ventilation port 41 to the outside (in the direction of the arrow (b)), and the valve body piston portion 35 (valve body 30) descends by the action of the compression spring 48, and the valve body 3
The tapered portion 33 at the leading end of the abutment 0 comes into contact with the valve seat 21 so that the valve mechanism is in a "closed" state, and the discharge of the pressurized liquid from the nozzle tip hole 28 is stopped. When the compressed air is introduced into the ventilation port 61 side (arrow (C) direction) at the same time when the valve mechanism is closed, the suction piston 55 (suction rod 50) is pushed up by the compressed air. Then, the liquid chamber 27 below the suction rod 50 has a negative pressure, and the residual liquid hanging down from the nozzle tip hole 28 is sucked into the nozzle body 20 to prevent the liquid dripping from the nozzle tip hole 28 (FIG. 3 state).

Further, when the switching valve 95 is switched, the compressed air is discharged to the outside from the ventilation port 61 (in the direction of the arrow (d)), and the suction rod 50 is lowered by the action of the compression spring 68 and the negative pressure of the liquid chamber 27 is reduced. The pressure state is eliminated (the state of FIG. 1).

As can be seen from the above description of the operation, in the present invention, the valve body piston portion 35 and the valve body piston portion 35 are so formed that a negative pressure state is formed inside the nozzle body 20 at the same time when the valve mechanism is in the "closed" state. It is preferable to drive the suction piston 55 in synchronization with the suction piston 55. Of course, a slight delay time may be set for the synchronous operation in order to reliably prevent liquid dripping.

[0030]

According to the present invention, there is provided a dispenser device comprising: a valve body provided so as to be able to contact and separate from a valve seat for discharging and stopping a pressurized liquid; and a liquid drip inside the valve body. A suction rod slidably inserted for prevention, and a nozzle body for discharging liquid, wherein a negative pressure state is formed inside the nozzle body as the suction rod slides. Therefore, the apparatus is simple and compact, and has an extremely good repetition response of liquid discharge and stop. Liquid dripping from the nozzle tip can be reliably prevented, and the discharge quantitativeness is extremely excellent.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view schematically illustrating an example of a dispenser device according to the present invention and illustrating a temporal operation.

FIG. 2 is a schematic cross-sectional view for schematically illustrating an example of the dispenser device of the present invention and explaining a temporal operation.

FIG. 3 is a schematic cross-sectional view schematically illustrating an example of the dispenser device of the present invention and explaining a temporal operation.

FIG. 4 is a schematic sectional view schematically showing an example of a conventional dispenser device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dispenser apparatus 12 ... Liquid inflow hole 20 ... Nozzle main body 21 ... Valve seat 27 ... Liquid chamber 30 ... Valve body 35 ... Valve body piston part 50 ... Suction rod 55 ... Suction piston part 70 ... Stopper adjusting screw

Claims (6)

[Claims] 1. A valve body provided so as to be able to be separated from and brought into contact with a valve seat for discharging and stopping a pressurized liquid, and slidable inside the valve body to prevent liquid dripping. A suction rod inserted into the nozzle body, and a nozzle body for discharging liquid, wherein a negative pressure state is formed inside the nozzle body as the suction rod slides. 2. The valve body has a valve body piston portion, which can be separated from and connected to a valve seat with the stroke movement of the valve body piston portion, wherein the suction rod has a suction piston portion, 2. The dispenser device according to claim 1, wherein a negative pressure state is formed inside the nozzle body with the stroke movement of the suction piston portion, and liquid dripping at the tip of the nozzle body can be prevented. 3. The valve body piston part and the suction piston part are arranged in series in an axial direction, and the valve body piston part is arranged at a position close to a nozzle body. 3. The dispenser device according to 2. 4. The dispenser device according to claim 1, further comprising a stroke adjusting mechanism for adjusting a stroke moving distance of the suction piston portion. 5. A liquid-tight member for forming a liquid-tight member is interposed on a sliding surface between the valve member and a suction rod provided inside the valve member. A dispenser device according to any one of the above. 6. The liquid to be discharged is introduced into the apparatus in a pressurized state. The liquid is sucked into the valve body piston so that a negative pressure state is formed inside the nozzle body at the same time when the valve is closed. The dispenser device according to any one of claims 1 to 5, wherein the piston portion is driven synchronously.