JPH1059405A - Liquid discharging pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent liquid from being accidentally discharged at the time of a change in temperature or when a container drops in the container equipped with a liquid discharging pump having a push-down head with a discharge nozzle. SOLUTION: The liquid discharging pump 10 comprises an inner cap 11 to be attached to a neck of a container 1 and a push-down head 12 with a discharge nozzle locked on the inner cap 11, wherein a cylinder 13 and a piston 14 are provided in the inner cap 11, a suction valve 16 is provided as a check valve on a lower part of the cylinder 13, and a discharge valve 19 is provided on an upper part of the piston. In this case, a liquid sealing part 17 is provided on a liquid flow path between the suction valve 16 and a piston internal chamber 14a for shutting the liquid flow path in cooperation with the piston 14 when the piston 14 is positioned at an upper end of its vertically movable range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump mounted on the mouth and neck of a container containing a liquid, and a vertically-push type liquid discharge pump for discharging a liquid from the inside of the container by pushing down the head of the pump. About. More specifically, the present invention relates to a liquid discharge pump that prevents liquid from being inadvertently discharged from a container due to a temperature change, a drop of the container, or the like.

[0002]

2. Description of the Related Art Heretofore, as one of liquid discharge pumps mounted on a container containing a liquid and discharging the liquid in the container, a pressing head with a discharge nozzle and a cap for fixing the head to the mouth and neck of the container. There is known a vertically-push type liquid discharge pump in which a liquid is sucked into a pump from a container by pushing down the head and further discharged from a discharge nozzle.

[0003] Such a liquid discharge pump is generally provided with a cylinder provided in a cap, a piston mounted in the cylinder, which moves up and down by pressing and releasing a pressing head, and a liquid from a container to the cylinder. It comprises a suction valve provided in the suction path and a discharge valve provided in the liquid discharge path from the cylinder to the discharge nozzle.

[0004]

However, in the case of a container equipped with a conventional liquid discharge pump, when the pressure in the container is increased due to a temperature change, or when the container is pressed due to dropping of the container, etc. Originally, even when the liquid was not discharged, there was a problem that the suction valve in the cylinder opened easily and the liquid leaked from the discharge nozzle carelessly.

SUMMARY OF THE INVENTION The present invention is to solve such a problem of the prior art, and in a container equipped with a liquid discharge pump, liquid is prevented from being inadvertently discharged due to a temperature change, a drop of the container, or the like. The purpose is to do.

[0006]

The inventor of the present invention provided a liquid sealing part in a liquid flow path between a suction valve and a piston, thereby enabling the pressing head with discharge nozzle to be unintentionally discharged. When the piston is not pushed down, that is, when the piston is located at the upper end of the movable range, the lower flow passage hole on the suction valve side of the piston is closed, and it has been found that the above object can be achieved, thereby completing the present invention.

That is, the present invention comprises an inner cap attached to the mouth and neck of a container, and a pressing head with a discharge nozzle locked on the inner cap, wherein a cylinder is formed in the inner cap, A piston is vertically mounted inside the cylinder, a suction valve is provided at the bottom of the cylinder for sucking liquid from the container, and an inner chamber is provided inside the piston. The lower part communicates with the liquid discharge path of the lowering head, the lower part communicates with the suction valve via the inside of the cylinder, and the lowering head with the discharging nozzle is pressed down between the inner cap and the lowering head with the discharging nozzle. An elastic body is provided to restore it to its original state when it is released.The piston is moved up and down by pushing down and releasing the push-down head with the discharge nozzle, sucking the liquid from the container into the cylinder, A liquid discharge pump for discharging from a discharge nozzle of a push-down head with a discharge nozzle via an inner chamber of a piston, wherein the piston has the elasticity in a liquid flow path between the inner chamber of the piston and the suction valve. A liquid discharge pump is provided, wherein a liquid sealing part is provided for blocking the liquid flow path in cooperation with the piston when being pushed up by a body and positioned at an upper end of a movable range.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. In each of the drawings, the same reference numerals represent the same or equivalent components.

FIG. 1 is a sectional view of a container 1 on which a liquid discharge pump 10 according to an embodiment of the present invention is mounted.

The container 1 shown in FIG. 1 has a bottom cap 3 fitted on a cylindrical side wall 2 and a movable inner plate 4 mounted therein. Liquid is stored on the movable inner plate 4.

On the other hand, a liquid discharge pump 10 mounted on the mouth and neck of the container 1 is engaged with an inner cap 11 screwed to the peripheral wall 5 of the mouth and neck of the container 1 and is locked on the inner cap 11. And a press-down head 12 with a discharge nozzle.

Inside the inner cap 11, a cylinder 13 is provided.
Are formed. A piston 14 is mounted in the cylinder 13 so as to be movable up and down, and the piston 14 has an inner chamber 14a therein. The upper portion of the inner chamber 14a communicates with the liquid discharge passage 15 of the press-down head 12 with a discharge nozzle through a check valve (that is, a discharge valve) 19. A backless valve made of a three-point supported resin spring is inserted in the lower part of the cylinder 13 as a check valve (ie, a suction valve) 16 for sucking liquid from the container 1. A liquid sealing part 17 is provided between the suction valve 16 and the inner chamber 14a of the piston 14.

FIG. 2 is a side view (FIG. 2A) and a sectional view (FIG. 2B) of the liquid sealing part 17. As shown in FIG. The liquid sealing part 17 has a suction valve 16 inside its bottom.
A wide-diameter concave portion into which the end portion is fitted is formed, on which a cylindrical portion 17a extends, and stands on the suction valve 16. A liquid passage hole 17b is formed on a side surface of the cylindrical portion 17a. A fitting portion 17c is formed on the upper part of the liquid sealing part 17 by expanding the outer diameter of the cylindrical portion 17a to provide a taper. Further, a projecting portion 17d projecting upward is formed on the upper end portion. ing. The liquid flow path is closed at the upper end.

A check valve (discharge valve) 19 is provided above the inner chamber 14a of the piston 14 as described above.
The discharge valve 19 is formed by fitting an inner part 19a and an outer part 19b.

In the press-down head 12 with a discharge nozzle, a discharge nozzle 18 and an upper cap 20 are integrally formed. An elastic body, for example, a spring 21 is provided between the inner cap 11 and the upper cap 20 to return the press-down head 12 with the discharge nozzle to the original state when the press-down head 12 is pressed down.

Therefore, in the liquid discharge pump 10, when the press-down head 12 with the discharge nozzle is pressed at an arbitrary position and pressed down, the piston 14 is also pressed down as shown by the broken line in FIG. And the push-down head 12 with the discharge nozzle returns to the initial position, whereby the piston 14 also returns to the initial position. Then, the rise of the piston 14 at this time causes a negative pressure in the cylinder 13, so that the liquid from the container 1 passes through the suction valve 16 and further flows through the liquid sealing part 17 as shown in FIG. It is sucked into the cylinder 13 through the hole 17b.

After the press-down head 12 with the discharge nozzle returns to the initial position, the press-down head 12 with the discharge nozzle is pressed down again, so that the piston 14 is also pressed down, and the liquid sucked into the cylinder 13 is pressurized. Is done. Therefore,
The liquid in the cylinder 13 passes through the discharge valve 19 and is discharged from the discharge hole 22 through the liquid discharge path 15.

After the liquid is discharged from the discharge holes 22 of the discharge nozzle 18 in this manner, the pressing head 12 with the discharge nozzle
Is released, the press-down head 12 with the discharge nozzle is pushed back by the restoring force of the spring 21 and rises, and the piston 14 incorporated in the press-down head 12 with the discharge nozzle also rises. In the present invention, in a state where the piston 14 rises and is located at the upper end of its movable range, the inner peripheral taper portion 14b at the lower end of the piston 14 is fitted with the liquid sealing part 17 as shown in FIG. The piston 14 is closely fitted to the tapered portion 17e of the portion 17c.
Is closed, and the liquid flow path between the suction valve 16 and the piston inner chamber 14a can be shut off.

That is, when the pressure in the container 1 fluctuates due to a temperature change or the like and becomes pressurized when the flow path is closed as described above, the suction valve 16 is in an opening direction with respect to the pressure P0. As shown in FIG. 4, this pressure reaches the inside of the cylinder 13 via the suction valve 16 and the liquid passage hole 17b of the liquid sealing part 17. In the cylinder 13, this pressure is applied to the outer peripheral surface 14c of the inner peripheral taper portion 14b of the piston 14 fitted to the fitting portion 17c of the liquid sealing part 17.
And acts as a pressure P1 in the radial direction. As a result, the inner peripheral taper portion 14 b of the piston 14 tightens the fitting portion 17 c of the liquid sealing part 17, and the inner peripheral taper portion 14 b of the piston 14 and the taper portion 17
The degree of close fitting with e increases.

Therefore, according to the liquid discharge pump 10, even if the pressure in the container 1 fluctuates due to a temperature change or the like and the pressure is increased, the liquid moves from the container 1 into the cylinder 13, and the discharge valve The liquid is prevented from flowing in the direction of 19, so that the liquid is prevented from flowing out to the liquid discharge path 15. Further, even if the liquid remains in the liquid discharge path 15, it is possible to prevent the liquid from leaking from the discharge holes 22.

Further, according to the liquid discharge pump 10,
When the press-down head 12 with the discharge nozzle is in the pushed-off state, as shown in FIG. 5, the protrusion 17d on the upper part of the liquid sealing part 17 pushes up the discharge valve 19, and the discharge valve 19 is opened. Therefore, when the press-down head 12 with the discharge nozzle is released, the press-down head 12 with the discharge nozzle moves in the initial position direction by the restoring force of the spring 21 and the inside of the cylinder 13 becomes a negative pressure. Part 17
As long as the opening of the discharge valve 19 caused by the protrusion 17d of the protrusion 17d pushing up the discharge valve 19 continues, it is possible to achieve a so-called back suction effect in which the residual liquid in the discharge nozzle 18 is sucked back into the cylinder 13. Become. Accordingly, unnecessary dripping after the liquid is discharged from the discharge holes 22 can be prevented.

When the piston 14 further rises due to the restoring force of the spring 21, the discharge valve 19 is released from contact with the projecting portion 17d of the liquid sealing part 17, and the discharge valve 19 is released.
Thus, the liquid flow path between the cylinder 13 and the liquid discharge path 15 is completely closed. As a result, the cylinder 13
The suction valve 16 is opened until the negative pressure in the container is released, and the container 1
, The liquid is sucked into the cylinder 13.

As described above, the projecting portion 1 is formed on the liquid sealing part 17.
By forming 7d, the back suction effect can be achieved. However, by changing the height of the projection 17d, the suction state of the liquid remaining in the liquid discharge path 15 with respect to liquids having different viscosities can be reduced. It can be adjusted.

In the liquid discharge pump 10,
As the check valve, the suction valve 16 is provided at the lower part of the cylinder 13 and the discharge valve 19 is provided at the upper part, so that the opening and closing mechanism of the check valve is made to work in conjunction with the piston 14, The liquid flow path from when the liquid is sucked to when it is discharged, including the liquid flow path of the inner 13, can be widened,
Flow resistance can be reduced. Therefore, even when the liquid to be discharged contains particles (about 100 to 1000 μm) having a diameter that can be generally blended in cosmetics, detergents, etc., the liquid can be discharged without any trouble. Further, the flow path diameter can be appropriately set to an optimum value from a wide range of setting widths according to the particle diameter of the particles contained in the liquid to be discharged.

For example, when the flow path diameter is about 1000 μm or more,
When the disintegrating substance is preferably about 4000 μm, even when disintegrating substances such as disintegrating scrub, disintegrating microcapsules and disintegrating granules are contained in the liquid, the liquid can be sucked and discharged without disintegrating them. Becomes

By appropriately setting the flow path diameter in this way, the viscosity of the liquid to be discharged can be made to correspond to a wide range, and a cosmetic liquid such as an emulsion of 1000 cp to 100,000 cp (room temperature) or a gel-like substance can be used. Can be used for ejection. In particular, from the viewpoint of the pressing pressure and the operability when pressing down the press-down head 12 with the discharge nozzle, 1000 cp
It can be preferably used for discharging liquid of up to 50,000 cp.

In the above-described liquid discharge container, the liquid in the container 1 is discharged from the discharge hole 22 by repeatedly pressing and releasing the pressing head 12 with the discharge nozzle. When the liquid is discharged, the inside of the container 1 becomes negative pressure, so that the movable middle plate 4 rises from the bottom as shown by the arrow in FIG. 1 according to the negative pressure, and the negative pressure in the container 1 is released.

The liquid discharge pump of the present invention can take various forms other than the embodiment shown in FIG. For example, in the liquid discharge pump 10 of FIG. 1, the liquid sealing part 17 has a cylindrical portion 17a having a liquid flow path hole 17b on the side surface, but instead of this cylindrical portion 17a, FIG. A plate-like portion 17q may be provided like the liquid sealing part 17p shown in FIG. (A) side view and FIG. (B) xx cross-sectional view). In this case, the side surface of the plate portion 17q and the bottom side of the liquid sealing part 17p communicate with each other through the liquid flow hole 17r. Thus, as long as the liquid flow path is communicated, the plate-like portion 17q can have various cross-sectional shapes. For example, the plate-like portion 1q of the liquid sealing part 17p
7q may be a shape in which three plate materials are radially combined as shown in FIG. 7, or a shape in which plate materials are combined in a cross shape as shown in FIG.

Further, in the liquid discharge pump 10 shown in FIG. 1, the discharge nozzles 18 are provided obliquely, but the discharge nozzles can be provided at various angles according to the use of the pump, the use environment and the like.

Further, in the liquid discharge pump 10 of FIG. 1, the discharge nozzle 18 and the upper cap 20 are integrally formed, thereby reducing the number of parts required for manufacturing the liquid discharge pump 10 and reducing the manufacturing cost. However, these may be formed from separate members as needed.

There is no particular limitation on the container in which the liquid discharge pump 10 of the present invention is mounted, and the liquid discharge pump 10 can be mounted in various containers as needed. Can be taken. For example, FIG.
Has a movable inner plate 4, and the movable inner plate 4 rises with the discharge of the liquid in the container. Therefore, a dip tube is connected to the cylinder 13 of the liquid discharge pump 10 below it. Although not shown, a dip tube can be connected to the cylinder 13 when a normal bottle having no movable middle plate 4 is used as the container. When the movable inner plate 4 is not provided, an inner bag-containing double container provided with an inner bag made of a shrinkable film inside the container 1 may be used, or an inner bag integrally molded double container may be used. Good.

Various self-restoring valves or ball valves can be used for the check valves used above and below the cylinder 13.

[0033]

According to the liquid discharge pump of the present invention, the liquid is inadvertently discharged even when the internal pressure of the container to which the pump is mounted rises due to a temperature change or when the container falls. Is prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a container equipped with a liquid discharge pump of the present invention.

FIG. 2 is a side view (FIG. 2A) and a cross-sectional view (FIG. 2B) of the liquid sealing part.

FIG. 3 is an explanatory diagram of an operation of a liquid sealing part when a press-down head with a discharge nozzle is operated.

FIG. 4 is an explanatory view of the operation of the liquid sealing part when the press-down head with the discharge nozzle is not operated.

FIG. 5 is an explanatory diagram of a back suction effect of a liquid sealing part.

FIG. 6 is a side view (FIG. 6A) and a cross-sectional view (FIG. 6B) of the liquid sealing part.

FIG. 7 is a side view (FIG. 7A) and a cross-sectional view (FIG. 7B) of the liquid sealing part.

FIG. 8 is a side view (FIG. 8A) and a cross-sectional view (FIG. 8B) of the liquid sealing part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Side wall 3 Bottom cap 10 Liquid discharge pump 11 Inner cap 12 Depressing head with discharge nozzle 13 Cylinder 14 Piston 14a Inner chamber of piston 14b Inner peripheral taper part of piston 14c Outer peripheral surface of inner peripheral taper part of piston 16 Suction valve 17 Liquid sealing part 17a Cylindrical part of liquid sealing part 17b Liquid passage hole of liquid sealing part 17c Fitting part of liquid sealing part 17d Projecting part of liquid sealing part 17e Tapered part of liquid sealing part 18 Discharge nozzle 19 Discharge valve 20 Upper cap 21 Spring 22 Discharge hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Yashima 2-1-3 Bunka, Sumida-ku, Tokyo Inside Kao Corporation Research Laboratories (72) Yukihara Yubara 5-29-10 Tachibana, Sumida-ku, Tokyo Yoshida Kogyo (72) Inventor Hiroshi Ishita 5-29-10 Tachibana, Sumida-ku, Tokyo Yoshida Kogyo Co., Ltd.

Claims (4)

[Claims] An inner cap attached to the mouth and neck of a container, and a pressing head with a discharge nozzle locked on the inner cap, a cylinder is formed in the inner cap, and a cylinder is formed in the cylinder. A piston is mounted vertically movable,
A suction valve for sucking liquid from the container is provided at the lower part of the cylinder, an inner chamber is provided inside the piston, and the upper part communicates with the liquid discharge path of the nozzle-down press head via the discharge valve. Communicates with the suction valve via the inside of the cylinder, and between the inner cap and the push-down head with the discharge nozzle, there is an elastic body that returns to the original state when the push-down head with the discharge nozzle is pushed down. The piston is moved up and down by pushing down and releasing the press-down head with discharge nozzle, sucks liquid from the container into the cylinder, and discharges the liquid through the inner chamber of the piston. The piston is pushed up by the elastic body and positioned at the upper end of the movable range in the liquid flow path between the inner chamber of the piston and the suction valve. A liquid discharge pump, wherein a liquid sealing part is provided to shield in cooperation with the piston liquid flow path when. 2. The liquid sealing part has a cylindrical portion that stands on the suction valve, the cylindrical portion has a closed upper end and a liquid passage hole on a side surface. At the top of the fitting part, when the piston is pushed up by the elastic body and located at the upper end of the movable range, the lower passage hole of the piston is closed, and a fitting part for preventing liquid from flowing in the cylinder in the direction of the discharge valve is provided. The liquid discharge pump according to claim 1, wherein the liquid discharge pump is formed. 3. The liquid-sealing part has a plate-like portion rising on the suction valve, and a side surface of the plate-like portion and a bottom side of the liquid-sealing part communicate with each other through a liquid flow path. In the upper part of the plate-shaped part, when the piston is pushed up by the elastic body and located at the upper end of the movable range, the lower passage hole of the piston is closed to prevent the liquid from flowing in the cylinder in the direction of the discharge valve. The liquid discharge pump according to claim 1, wherein a fitting portion is formed. 4. The liquid sealing part has a protrusion protruding in the direction of the discharge valve, and when the press-down head with the discharge nozzle is pressed down, the discharge valve is pushed up by the liquid sealing part to open. The liquid discharge pump according to claim 1.