JP4038344B2 - Accumulated liquid ejector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure-accumulating liquid ejector, which is intended to advantageously prevent liquid leakage in a cylinder accompanying improvement of the pumping operation of the ejector.
[0002]
[Prior art]
As an ejector for finely spraying liquid such as lotion, colon or perfume, at present, a so-called aerosol type ejector in which a dispersion medium is filled in a container together with a pressurized medium is often used. The ejector is expensive to manufacture and the pressurized medium often remains in the container even after all of the dispersion medium has been used up. Since it is indispensable to discharge the container, it takes time to dispose of the container, and there is a concern that the release of the pressurized medium into the atmosphere may lead to environmental pollution.
[0003]
For this reason, recently, a pressure medium such as that used in aerosol type ejectors is not required, the internal pressure is increased by pumping the ejection head a plurality of times, and the contents are ejected with that pressure. The pressure-accumulating type ejector has been reviewed, and as a prior art regarding this point, for example, a pump type spray as disclosed in JP-A-9-103718 is referred to.
[0004]
This type of ejector has, as its constituent members, a cylinder having a suction port leading to the inside of the container, a cylinder fixedly held at the mouth of the container, a piston disposed in the cylinder, and a mutual contact between the piston A piston guide that opens and closes a passage through which liquid to be ejected by separation, a hollow stem that holds one end of the piston guide and connects the other end to the back of the piston via an elastic member, and engages with the hollow stem. The pumping pump is a combination of a pressure cap with a nozzle that ejects the content flowing out through the internal passage, and repeatedly applies an intermittent load to the pressure cap to suck and press the content. Enables continuous ejection of contents.
[0005]
Here, the piston and the piston guide are held by an elastic member (an internal pressure adjusting spring and a suction pressurizing spring) sandwiching them from both sides, and the load is not applied to the pressing cap. The elastic force of the elastic member is adjusted so as to close the passage through which the liquids come into contact with each other.
[0006]
By the way, in order to realize a smooth pumping operation by reducing the load applied to the pressing cap when the contents are ejected, the elasticity of either the internal pressure adjusting spring or the suction pressurizing spring of the elastic member is required. Although it is effective to reduce the force, in this case, since the contact pressure between the piston and the piston guide decreases, there is a problem that liquid leakage occurs in the cylinder and the contents cannot be efficiently ejected.
[0007]
[Problems to be solved by the invention]
The subject of this invention exists in the place which proposes the novel pressure accumulation type ejector which can eject a liquid smoothly with a small load, without raise | generating the liquid leak inside.
[0008]
[Means for Solving the Problems]
The present invention relates to a cylinder having a suction port communicating with the inside of a container and fixedly held at the mouth portion of the container via a base member, and a piston disposed in the cylinder and penetrating in a direction along the axis. A piston guide disposed through the passage of the piston to open and close the passage by mutual contact and separation, and to form a space region for sucking and pressurizing liquid in cooperation with the cylinder and the piston, and a suction port of the cylinder A check valve that opens only when liquid is sucked, a hollow stem that is slidable while maintaining a liquid-tight state outside the piston, and engages with the end of the piston guide, and a protruding end of the hollow stem. A pressing cap having a nozzle that is adapted to eject liquid flowing out through the inner space of the hollow stem to the outside, and a piston guide that presses the piston against the piston. Tons of passage a first elastic member and, accumulator type liquid ejector of a combination of a second elastic member for adjusting the ejection pressure of the contents of pressing the piston to the piston guide to maintain the closed state,
In the cylinder, the piston is positioned before the contents are ejected by contacting the end of the piston, and the contact surface pressure between the piston and the piston guide is increased regardless of the change in the elastic force of the second elastic member. A pressure accumulation type liquid ejector comprising a stopper for maintaining the closed state of the passage.
[0009]
In the ejector configured as described above, the first elastic member can be disposed between the pressing cap and the base member, but is disposed between the piston guide and the bottom wall portion of the space region. Also good.
[0010]
The stopper is preferably formed as a ring member that is integrally formed with the base member and contacts the rear end of the piston before the contents are ejected.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 shows a configuration of a pressure accumulation type ejector according to the present invention. In the figure, reference numeral 1 is a container filled with contents, and 2 is a mouth of the container 1.
[0012]
Reference numeral 3 denotes a base member shown in the example having an opening communicating with the inside of the container 1 and screwed to the mouth portion 2, and 4 denotes a cylinder fixedly held on the mouth portion 2 of the container 1 via the base member 3. is there. A suction port 4 a for sucking the contents through the suction pipe s is formed in the bottom wall portion of the cylinder 4.
[0013]
Reference numeral 5 denotes a piston disposed in the cylinder 4. The piston 5 has a passage 5a penetrating in a direction along the axis.
[0014]
No. 6 is a piston guide, and this piston guide 6 is arranged through the passage 5a of the piston 5 to guide the opening / closing operation of the passage 5a. In cooperation with the cylinder 4 and the piston 5, suction of liquid, A space region (cylinder chamber) M for pressurization is formed.
[0015]
Further, 7 is a check valve that opens the suction port 4a of the cylinder 4 only when the contents are sucked, and 8 is a hollow stem. The hollow stem 8 is slidably covered outside the piston 5 while maintaining a liquid-tight state, and is engaged with the end of the piston guide 6.
[0016]
Reference numeral 9 denotes a pressing cap adapted to the protruding end of the hollow stem 8, and the pressing cap 9 includes a nozzle 9 a for ejecting liquid flowing out through the internal space 8 a of the hollow stem 8 to the outside.
[0017]
Reference numeral 10 denotes a first elastic member. The first elastic member 10 is disposed in the space region M of the cylinder 4 and has a function of pressing the piston guide 6 against the piston 5 to maintain the passage 5a of the piston 5 in a closed state.
[0018]
Reference numeral 11 denotes a second elastic member. The elastic member 11 is shown as an example disposed between the piston 5 and the hollow stem 8 and presses the piston 5 against the piston guide 6. It has a function of adjusting the ejection pressure (internal pressure) of the contents .
[0019]
Further, reference numeral 12 denotes a stopper shown as an example in which it is integrally formed as an inner ring of the base member 3. The stopper 12 contacts the end of the piston 5 in the cylinder 4 to position the piston 5 before the contents are ejected.
[0020]
The passage 5a of the piston 5 is maintained in a closed state by pressing the piston guide 6 and the piston 5 in opposite directions by the first elastic member 10 and the second elastic member 11, but smooth injection of the contents is performed. If the elastic force of the second elastic member 11 is reduced to reduce the pressure of the piston 5 against the piston guide 6, the sealing performance in the closed state of the passage 5a is impaired, which leads to internal leakage. Yes.
[0021]
In the present invention, the stopper 12 is in contact with the end of the piston 5 for positioning, and even if the elastic force of the second elastic member 11 is changed, the push of the first elastic member 10 against the piston 5 is performed. Since the pressure is always constant, the contents can be smoothly ejected without impairing the sealing performance in the closed state of the passage 5a.
[0022]
Although the stopper 12 is shown as an example of being integrally formed with the base member 3, it can be formed as a separate member, or can be integrally formed with the cylinder 4 if there is no particular problem in molding.
[0023]
A helical spring can be applied to both the first elastic member 10 and the second elastic member 11, but the shape is not particularly limited as long as a desired elastic force can be secured. Moreover, although the thing made from resin can be applied regarding a material, as long as there is no possibility of affecting the quality of the content, it may be metal.
[0024]
As shown in FIG. 2, when a load is applied to the upper surface of the pressing cap 9 to push down the piston 5 together with the hollow stem 8, and the load is subsequently removed, the hollow stem is restored by the restoring force of the first elastic member 10. 8 returns to the initial state together with the piston 5, and at this time, the space region M is decompressed, and the contents in the container 1 flow into the region M through the suction pipe s and the suction port 4a. .
[0025]
In this state, when a load is further applied to the upper surface of the pressing cap 9 and the piston 5 is pushed down together with the hollow stem 8, the suction port 4a is closed by the check valve 7 as shown in FIG. As the internal pressure rises and the relationship between the piston 5 and the hollow stem 8, the passage 5a is opened until the inner end 8b of the hollow stem 8 abuts against the end surface 5b of the piston 5, and the contents are under the internal pressure. The air is injected from the nozzle 9a of the pressing cap 9 to the outside through the internal space 8a of the hollow stem 8.
[0026]
By repeatedly applying a load to the pressing cap 9, the contents are continuously jetted, and a pressurizing medium that is indispensable in an aerosol type ejector is not necessary.
[0027]
In the configuration example shown in FIG. 1, each member can be formed of a synthetic resin. In particular, the first elastic member 10 and the second elastic member 11 include a piston guide 6 and a hollow stem as shown in FIG. 8 is advantageous in that the number of parts can be reduced when a single member is formed integrally with each other.
[0028]
Each member constituting the ejector can be manufactured by applying an injection molding method, but the molding method is not particularly limited in the present invention.
[0029]
As the synthetic resin, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyoxymethylene (POM) and the like having excellent chemical resistance can be used in addition to polyethylene, polypropylene, nylon and ABS.
[0030]
【The invention's effect】
According to the present invention, the contents can be ejected smoothly (lightly) without liquid leakage inside. Further, since the number of parts can be reduced, the assembling process can be simplified and the cost can be reduced. In particular, when the constituent members are all made of synthetic resin, separate collection for each material becomes unnecessary when disposing of the ejector.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a pressure accumulating liquid ejector according to the present invention.
FIG. 2 is an explanatory view of an injection procedure of the ejector shown in FIG.
3 is an explanatory diagram of an injection procedure of the ejector shown in FIG. 1. FIG.
FIG. 4 is a view showing another example of the pressure accumulation type liquid ejector according to the present invention.
[Explanation of symbols]
1 Container 2 Port 3 Base Member 4 Cylinder 4a Suction Port 5 Piston 5a Passage 5b End Face 6 Piston Guide 7 Check Valve 8 Hollow Stem 8a Inner Space 8b Inner End 9 Pressing Cap
10 First elastic member
11 Second elastic member
12 Stopper s Suction tube M Space area (cylinder chamber)

Claims (4)

A cylinder having a suction port communicating with the inside of the container and fixedly held via a base member at the mouth of the container; a piston having a passage disposed in the cylinder and extending in a direction along the axis; A piston guide which is arranged through the passage and opens and closes by mutual contact and separation, and forms a space area for suction and pressurization of liquid in cooperation with the cylinder and the piston, and suction of the liquid through the suction port of the cylinder A check valve that is opened only occasionally, a hollow stem that is slidable while maintaining a liquid-tight state on the outside of the piston, and that engages with the end of the piston guide. A pressure cap having a nozzle for ejecting liquid flowing out through the internal space of the hollow stem to the outside, and a piston guide pressed against the piston The a first elastic member and, accumulator type liquid ejector of a combination of a second elastic member for adjusting the ejection pressure of the contents of pressing the piston to the piston guide to maintain the closed state,
In the cylinder, the piston is positioned before the contents are ejected by contacting the end of the piston, and the contact surface pressure between the piston and the piston guide is increased regardless of the change in the elastic force of the second elastic member. And a stopper for maintaining the closed state of the passage.   The pressure accumulation type liquid ejector according to claim 1, wherein the first elastic member is disposed between the pressing cap and the base member.   The pressure accumulation type liquid ejector according to claim 1, wherein the first elastic member is disposed between the piston guide and the bottom wall portion of the space region.   The pressure accumulation type liquid ejector according to any one of claims 1 to 3, wherein the stopper is a ring member formed integrally with the base member and in contact with the rear end portion of the piston before the contents are ejected.

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