JP4328733B2 - Dispenser for liquid discharge - Google Patents

Description

The present invention relates to a dripping prevention mechanism from a nozzle in a manual pump dispenser for dispensing a liquid or a liquid in the form of a foam. The present invention also relates to a mechanism of a simple foam pump dispenser (hereinafter sometimes abbreviated as a pump) .

  A manual pump dispenser for removing shampoo or rinse filled in the container as a liquid or foaming is used by being attached to the container mouth. Its general structure is a liquid cylinder having a suction valve at the bottom, an air cylinder in a foam discharge pump, a piston that reciprocates in the cylinder, a stem with a discharge valve inserted into the piston, It consists of a head with a discharge nozzle fitted to the stem and a liquid suction pipe inserted below the suction valve, and is mainly used in a stationary state.

Therefore, the head is pushed down with one hand and the liquid is ejected from the nozzle. However, after the ejection, the liquid remaining in the nozzle drops for a while from its tip. As a countermeasure, a liquid discharge pump incorporating a dripping prevention mechanism has been developed. One example will be described. Normally, the liquid accumulator is depressurized and the discharge valve is closed as soon as the piston enters the return process after the head is pushed down to discharge the liquid. In this example, the valve shaft can be moved vertically in the pump chamber. With the intake valve body at the lower end of the valve shaft in contact with the valve seat of the intake valve, set the upper end of the valve shaft to a position higher than the valve seat of the discharge valve when locked, By slightly delaying the closing of the discharge valve in the return process, the inside of the cylinder is made negative pressure, and air or residual liquid is taken into the cylinder from the nozzle side by the negative pressure.
JP 08-337263 A (FIG. 3)

  In the above-described liquid dripping prevention dispenser using a valve shaft, it is important to adjust the time for delaying the closing of the discharge valve and the opening of the suction valve. When a large amount of air is taken into the cylinder, There is a possibility that inconvenience that the air is discharged to the air and the liquid is discharged after that. Moreover, the valve structure of the dispenser is complicated and the unit price of the apparatus is high.

Also, in a foam pump that discharges liquid in the form of foam, bubbles are generated by passing a liquid mixed with air through a porous body or mesh, but the liquid adhering to the porous body will eventually dry. As a result, a thin film is formed and clogging occurs, and a sufficient discharge amount and discharge speed cannot be obtained at the next use.

The pump according to claim 1 is a liquid cylinder having an accumulator chamber that is attached to the mouth of the container and sucks and stores the liquid in the container, and a piston that is reciprocally inserted into the inner diameter of the cylinder; A stem that is a liquid flow path with the piston fitted to one end and a nozzle head attached to the other end, a suction valve body and a liquid suction pipe at the lower end of the accumulator chamber, and a discharge valve body at the stem A liquid dispenser in which a spring for biasing the piston in the upward direction is inserted in the cylinder, and an elastic body capable of being deformed by pressure and restored by depressurization at the top of the head is liquid-tight and air-tight. A decompression chamber attached to the nozzle is formed, an air circulation hole communicating from the decompression chamber to the inside diameter of the nozzle is opened, and a mesh or a porous body is attached to the nozzle on the downstream side of the air circulation hole.

When the upper end of the head of the pump dispenser, that is, the elastic body is pushed down, the elastic body is deformed, and air corresponding to the amount of deformation is pumped and discharged into the nozzle from the air circulation hole. The foam discharge pump is equipped with a porous body in the nozzle, but the discharged air blows off the liquid adhering to the porous body and facilitates subsequent passage of the liquid or foam. To. Further, when the head is continuously pushed down, the elastic body is deformed and the stem and the piston attached to the stem descend together with the head to compress the liquid in the accumulator chamber, and the liquid in the accumulator chamber passes through the discharge valve. The ink is discharged from the nozzle. At this time, the air corresponding to the deformation of the elastic body is pumped into the nozzle from the air circulation hole in the same manner as described above, so that the air pressure passes through the pores of the porous body in the nozzle. The flow is assisted and smooth discharge is possible. In addition, when a porous body or the like is mounted in the nozzle of a general liquid dispenser, compressed air and liquid accompanying the deformation of the elastic body mix and pass through the porous body upstream from the porous body. Thus, it is easily foamed.

After the liquid is discharged, when the pressing of the head is stopped, the deformed elastic body restores its shape, and the decompression chamber above the head is decompressed. Due to this decompression, the residual liquid in the nozzle flows back through the air circulation hole into the decompression chamber. As a result, no liquid stays in the nozzle and liquid dripping from the tip is eliminated. At the same time, of course, the piston, stem and head are lifted by the bias of the spring to suck the liquid in the container into the accumulator chamber.

Examples of the elastic body include, but are not limited to, a plastic bellows. A bellows is useful in a foam dispenser that requires a relatively large amount of air discharge, for example, a porous body or a mesh.

The present invention will be described in detail with reference to the drawings. FIG. 1 shows Example 1. A liquid dispenser 1 attached to a mouth Bn of a container B by a cap 17 includes a liquid cylinder 2 having a liquid accumulator chamber 2a for storing liquid sucked from the container. The air cylinder 3 having an air accumulator chamber 3a above it, the liquid piston 4 and the air piston 5 inserted so as to reciprocate in the cylinders, and the pistons 4 and 5 are fitted together. And a stem 6 whose inner diameter is the liquid flow path 6a, a liquid feed pipe 7 fitted to the upper end of the stem 6, a head 9 with a nozzle 8 fitted to the upper end of the liquid feed pipe 7, The suction valve body 10 and the liquid suction pipe 11 attached to the lower end of the accumulator chamber 2 a and the discharge valve body 12 attached to the upper end of the stem 6, and the liquid piston 4 fitted to the lower end of the stem 6. The end is a common foam discharge pump as constituted of a spring 13 for urging upward is interpolated. In addition, a guide shaft 18 is erected in the inner diameter of the liquid piston 4 with a gap through which the liquid can flow .

  In the above pump, the pistons 4 and 5 are lowered in the respective cylinders 2 and 3 by pushing down the heads, and the liquid in the liquid accumulator 2a sucked up by the previous stroke is supplied to the liquid flow path 6a and the discharge valve 12. The liquid rises through the discharge valve 12 and is mixed with the air from the air cylinder 3 rising from the fitting gap between the stem 6 and the liquid feeding pipe 7 and passes through the porous body 16. Is discharged as a foam.

According to the present invention, in such a pump dispenser, an air flow hole 14 is formed in a part of the nozzle 8 so as to communicate with the upper surface of the head 9, and an elastic body such as plastic, for example, a bellows is formed on the upper surface of the head 9. 15 is provided with an air decompression chamber 15 a in which air 15 is airtight and liquid tightly attached, and discharge air generated by compression of the elastic body 15 is discharged into the nozzle 8 through the air circulation hole 14.

FIG. 2 shows the foam dispenser dispenser 1 in which a rubber cap 15c is mounted instead of the bellows 15, and the discharge air accompanying the deformation of the rubber cap 15c is introduced into the air circulation hole 14 to The discharge from the tip is the same as in FIG.

  FIG. 3 shows a general liquid discharge pump 21 that does not have the air piston 5. In the pump 21 as well, the air circulation hole 14 is formed in a part of the nozzle passing through the head 9 as described above, and an elastic body such as plastic, for example, a bellows 15 is hermetically sealed on the upper surface of the head 9. The pressure reducing chamber for air is installed in a liquid-tight manner, and the air discharged by the compression of the elastic bellows 15 is introduced into the air circulation hole 14 and discharged from the tip of the nozzle 8. is there.

In the liquid discharge pump 21 shown in FIG. 3, an elastic body 16 or mesh having continuous pores indicated by phantom lines is inserted in the inner diameter of the nozzle 8 and downstream of the air circulation hole 14. The liquid dispenser having this configuration is attached by a cap 17 to the caliber Bn of the container B filled with, for example, a detergent solution. When the bellows 15 is pushed down, the head 9, the stem 6 and the piston 4 are simultaneously lowered while the bellows is compressed. At this time, the first air discharged from the bellows 15 blows away the liquid at the time of the previous discharge that remains and adheres to the porous body 16, and the remainder is mixed with the liquid rising in the liquid passage upstream from the porous body 16. The That is, the piston 4 slidably fitted to the stem 6 relatively increases the outer diameter of the stem at the beginning of the lowering of the head 9 and opens the valve port 6b which is perforated on the side surface. The flow path 6a is communicated. When the head is lowered in this state, the liquid in the liquid accumulator chamber 2a rises in the stem through the valve port 6b and reaches the porous body 16. Then, it mixes with the air pushed out from the bellows 15 and passes through the porous body 16, and the liquid is bubbled and discharged. This eliminates the need for the air cylinder and pump shown in FIGS.

After the liquid is ejected from the nozzles by the head pressing operation, the elastic body 15 is restored when the pressure on the upper part of the head is released. As a result, the decompression chamber 15a in the upper part of the head becomes negative pressure, and the negative pressure is eliminated by sucking bubbles or liquid and air in the nozzle 8 from the air circulation hole 14. Therefore, although no liquid remains in the nozzle 8, some foamy liquid at the tip of the nozzle stays at the bottom of the decompression chamber 15a. Since this liquid is discharged from the air circulation hole 14 together with air (or in preference to air) at the next liquid discharge operation, that is, by the head pressing operation, the liquid for one operation or more does not remain.

The residual liquid for one operation stays until the next operation, but the air circulation hole 14 confined in the bottom surface of the decompression chamber 15a has a small diameter, and the elastic body 15 is airtight and liquid tightly attached. Therefore, the decompression chamber 15a becomes a sealed container, and there is no drop from the air circulation hole 14 into the nozzle.

  In order to take out a certain amount of shampoo, rinse, kitchen detergent, etc., it is used by attaching to the caliber of the container. In particular, in a detergent container placed around a kitchen sink, many housewives consider that it is unclean to inadvertently drip from a nozzle after the detergent is discharged. Since this dripping has been eliminated, it will be used more for home use. In addition, since the liquid can be taken out as bubbles with a simple structure, it contributes to the reduction of consumption of shampoo and the like.

FIG. 1 is a central sectional view showing a foam discharge dispenser equipped with a bellows as a first embodiment according to the present invention and showing a state where a head is at its highest position. FIG. 5 is a central cross-sectional view showing a foam discharge dispenser equipped with a rubber cap as a second embodiment according to the present invention and showing a state where the head is at the highest position. FIG. 6 is a central cross-sectional view showing a liquid dispenser equipped with a bellows as a second embodiment according to the present invention, in which the head is at the bottom dead center.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid dispenser 2, 3 Cylinder 4, 5 Piston 6 Stem 7 Liquid feeding pipe 8 Nozzle 8
9 Head 10 Suction valve body 11 Liquid suction pipe 12 Discharge valve body 13 Spring 14 Air flow hole 15 Elastic body

Claims (1)

A cylinder that is attached to the mouth of the container and has an accumulator chamber that sucks and stores the liquid in the container, a piston that is reciprocally inserted into the inner diameter of the cylinder, and this piston is fitted to one end and the other end Liquid with a stem serving as a liquid flow path equipped with a nozzle-equipped head, a suction valve body and a liquid suction pipe at the lower end of the accumulator chamber, and a spring inserted in the cylinder for urging the piston in the upward direction In the dispenser for use, an air circulation hole communicating with the inside of the nozzle from the decompression chamber, wherein the upper part of the head is a pressure-reducing chamber in which a blowing elastic body that can be deformed by pressure and restored by pressure-removal is liquid tight A dispenser for liquid, wherein a mesh or a porous body is mounted in a nozzle downstream of the air circulation hole.

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