JP2946125B2 - Foam squirt pump container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam ejection pump container for ejecting uniform foam in a dispenser after foaming liquid such as detergent, hand soap or shampoo is mixed with air to foam.

[0092]

2. Description of the Related Art As a conventional foam ejection pump container, a type in which a high-pressure gas such as carbon dioxide gas or chlorofluorocarbon gas is housed in a container together with a foaming liquid and bubbles are generated at the time of ejection is widely used. However, with the recent rise of the global environmental protection movement, it is also true that there is a tendency to completely ban the use of such high-pressure gas, and in particular to protect the earth's atmosphere. Therefore, there is an increasing demand for a foam ejection pump container that does not use such high-pressure gas.

Utility Model Registration No. 1529456 (Jun 5
8-23415) is a good example of a bubble jet pump container that does not use high-pressure gas. The proposal is summarized as follows: a double cylinder in which an air cylinder and a liquid cylinder provided in an opening of a container containing a liquid are concentrically provided; and a suction cylinder which communicates the bottom of the liquid cylinder with the bottom of the container. A nozzle having a liquid pipe, an air cylinder, a piston body integrally provided with an air piston and a liquid piston that moves up and down in the liquid cylinder, and a nozzle having a bubble ejection hole provided at an upper end of the piston body. A body, an air passage communicating the hole with the air piston, a liquid passage communicating the liquid piston with the hole, a first check valve disposed in the middle of the liquid passage, A second check valve disposed in the liquid cylinder, an urging spring for urging the piston body toward the top dead center with respect to the double cylinder, an air cylinder for fixing the double cylinder to the container, To form a lid and guide the piston A formed by disposing the breathable inclusions i.e. porous body such as a sponge structure with outside air introduction and the function of generating and discharging foam at the confluence of the air flow path and the liquid flow path in the bore.

With the above structure, the bubbles are moved by moving the piston body up and down to mix the liquid sent from the liquid cylinder and the air sent from the air cylinder in the permeable inclusion. The bubbles are generated and ejected to the outside through the holes of the nozzle body.

However, the air-permeable inclusion of the present proposal has a function of introducing outside air into the air cylinder and a function of generating and discharging bubbles, so that the fluid resistance at the time of introduction of outside air is increased and the piston body is increased. There is a problem that the vertical movement of the foam cannot be performed smoothly, and a problem that clogging occurs due to the liquid component of the foam remaining in the gas-permeable inclusion being dried and solidified in the gas-permeable inclusion.

Next, Utility Model Registration No. 1467526 (Japanese Utility Model Publication No. 57-20285) is a utility model registration No. 15
No. 29456 is a proposal of a bubble jet pump container not using high pressure gas by the same applicant. According to this proposal, with respect to the configuration of Utility Model Registration No. 1529456,
Further, an outside air introduction hole having an operation valve for erecting a liquid cylinder from the center of the bottom of the air cylinder of the double cylinder and communicating the inside of the container with the outside of the container to prevent the inside of the container from being negative pressure. Is provided in the air cylinder, and the skirt portion of the air piston sliding in the air cylinder is formed to be thin.

However, even in this proposal, the means for introducing outside air into the air cylinder is not specified, and if the same as the above proposal, it has the same disadvantage, and the air sliding in the air cylinder If the skirt portion of the piston for air is formed to be thin, the skirt portion is deformed inward when the pressure in the air cylinder is negative, and the outside air is introduced into the air cylinder. It is necessary to ensure sufficient accuracy of the rubbing of the piston.

Also, even if this accuracy is secured,
If the piston moves slightly downward when the piston is moved downward, sufficient air cannot be sent in,
There has been a problem that the amount of air sent to the air-permeable inclusion changes and the mixing ratio with the liquid cannot be kept constant.

Therefore, as a means for solving such a problem, the present applicant has developed a container as shown in FIGS. 5 and 6 (PCT / JA90 / 01445).

FIG. 5 is a longitudinal sectional view showing the upper part of the container in an unlocked state, and FIG. 6 is a longitudinal sectional view showing the lower part thereof.

In the present specification, the locked state means that the contact portions between the components are brought into press contact with each other as described later so that the liquid content does not leak during long-term storage or transportation, or when not used, such as in a store. To be in a sealed state, and a state in which such a sealed state is released is called an unlocked state.

The container shown in these figures is a bubble jet pump container which jets bubbles by a pump which is manually pressed and operated, whereby the resistance at the time of introducing outside air for generating bubbles is reduced and the vertical movement of the piston body is smoothed. In addition, there is no clogging of the porous body due to drying and solidification of the liquid component of the foam remaining in the porous body for foam generation, and the amount of air introduced into the air cylinder can be always kept constant and mixed with the liquid. The ratio is kept constant, and the nozzle body can be screwed into the lid to be in a sealed state (locked state) when the foam ejection pump container is transported or stored.

In brief, the container 1 containing the liquid A
A double cylinder 3 in which an air cylinder 3c for an air pump and a liquid cylinder 3d for a liquid pump provided concentrically are provided inside the opening of the cylinder, the bottom of the liquid cylinder and the container Suction tube 4 for communicating with the bottom of the
A piston body integrally and concentrically provided with a piston for air 10 and a piston for liquid 12 having a sliding seal portion and moving vertically in the cylinder for air and the cylinder for liquid, respectively, A nozzle body 17 having a hole 17b provided at the upper end of the body and a bubble passage 17a for ejecting bubbles, an air flow passage 10f communicating the hole with the inside of the air cylinder, the inside of the liquid cylinder, A liquid flow path 12a for communicating with the hole, a first check valve 70 provided in the middle of the liquid flow path, a second check valve 80 provided in the liquid cylinder, The sheet-like porous body 18 disposed in the hole portion, and at the junction of the liquid flow path and the air flow path on the front side of the location where the sheet-like porous body is disposed, where the liquid and air The mixing chamber 11 to be mixed and the piston A biasing spring 6 for biasing toward the top dead center side with respect to the damper is formed on the pneumatic cylinder to operate between the inside of the container and the outside of the container to prevent the inside of the container from becoming negative pressure, and to operate. 3 g of an outside air introduction hole having a valve;
Lids 14 and 15 for fixing the double cylinder to the container and guiding the piston through.
Further, the liquid cylinder is lowered from the bottom surface 3e of the air cylinder so that the sliding seal portion 10j of the air piston of the piston body and the sliding seal portion 13c of the liquid piston are moved up and down with a difference in height. A third extension for extending outside air into the air chamber formed by the air cylinder and the air piston through a gap between the outer peripheral surface of the air piston and the lid; Check valve 10
k is provided on the air piston, and the air piston and the nozzle body are configured to be screwable against the urging spring.

More specifically, the cylindrical container 1
Is made of a resin or the like, and a foaming liquid A, which is mixed with a surfactant or the like and has a property of foaming by mixing with air, is stored therein to a liquid level W having a maximum liquid level. . An opening screw portion 1a of a male screw portion is integrally formed with an outer peripheral edge portion of an upper opening portion of the container 1, and an inner screw portion 15 which is a female screw portion of the large lid 15 is formed with respect to the opening screw portion 1a.
By maintaining the screwed state of a, the airtight state of the container is maintained, and the pump assembly described below can be fixed to the container 1 in a completed state.

Next, regarding the pump assembly, the cylinder part of the pump is injection-molded from, for example, a polypropylene resin or the like, and at the same time, as shown in FIG.
It is formed as a double cylinder 3 having a plurality of air cylinders 3c and a liquid cylinder section 3d. The double cylinder 3 is opened upward, the fitting ring portion 3a having a locking portion which is locked after being press-fitted into the small lid body 14 at the opening edge portion, The flange portions 3b to be fixed portions are each formed in an annular shape. Therefore, the double cylinder 3
After assembling the parts described below, the above-mentioned large lid 15 is inserted into the flange portion 3b of the double cylinder 3 in advance, and finally the small lid which is injection-molded from a colored polypropylene resin or the like. 14 outer wall locking portion 14c and inner wall portion 14
b, the fitting ring portion 3a is press-fitted and locked to be integrated,
The large lid 15 is prevented from falling off the pump assembly.

Next, the double cylinder 3 has an outer diameter slightly smaller than the inner diameter of the opening screw portion 1a of the container 1 following the fitting ring portion 3a and the flange portion 3b as shown in the figure, and An air cylinder 3c having a shape, and a liquid cylinder portion 3d, which is connected to the air cylinder 3c and has a cylindrical shape that is substantially concentric with the air cylinder 3c and has a smaller diameter than the air cylinder 3c. .

[017] In more detail, the air cylinder 3c and the guide cylinder portion 3c ₁ even inner diameter smaller than the fitting ring portion 3a, the guide tube portion 3c ₁ and connected to it and the guide cylinder portion 3c at the tapered portion
A cylindrical portion whose inner diameter than ₁ consists of a small cylinder portion 3c ₂ Prefecture, extends from the lower end of the cylinder 3c ₂ diametrically inwardly, comprising a bottom portion 3e of the central portion is inverted upward. On the other hand, the liquid cylinder portion 3d is connected to the upper end of the inverted portion of the bottom portion 3e of the air cylinder 3c, where the seal protrusion 3f described later is formed, and from the connection portion downward. It extends and has a smaller diameter near the lower end.

[018] Note that the size relationship between each of the inner diameter of the annular fitting member portion 3a and the guide cylinder portion 3c ₁ and the cylinder portion 3c _2, the outer diameter of the sliding seal portion 10j of an air piston 10 to be described later,
Fitting ring inside diameter of 3a is larger than the outer diameter of the sliding seal portion 10j, the inner diameter of the guide tube portion 3c ₁ is substantially equal to the outer diameter of the sliding seal portion 10j, the inner diameter of the cylinder portion 3c ₂ sliding seal It is slightly smaller than the outer diameter of the portion 10j. Further, the inner surface portions having different inner diameters are connected by a tapered portion. With the above configuration, the air piston 10
When a pre-assembled assembly of the piston for liquid and the piston for liquid is inserted into each cylinder, the sliding seal portion 10j of the piston for air 10 is inserted into the fitting ring portion 3a, the flange portion 3b, the guide cylinder portion 3c ₁ , and the cylinder. simply by lowering the order of the part 3c _2, since inevitably can centering the liquid cylinder portion 3d and the liquid piston 12, moreover easy insertion operation, damage the sliding portion of the piston during its work It is said that there is no fear.

The mixing ratio of liquid and gas is determined by the air cylinder 3
The volume of air is substantially determined by the volume ratio between c and the liquid cylinder portion 3d. In order to generate bubbles, the amount of air needs to be sufficiently larger than the amount of liquid. If the length is too large, the height of the container 1 must be increased correspondingly, so that the center portion of the bottom 3e of the air cylinder 3c is inverted upward as described above, and the upper end portion is It is connected to the liquid cylinder 3d.

Further, while the liquid cylinder portion 3d is suspended from the bottom 3e of the air cylinder 3c, the sliding seal portion 10j of the air piston 10 and the liquid piston 12
The sliding seal portion 13c is provided with a height difference, so that the slidable piston is supported at least at two upper and lower positions, and the prevention of the inclination and the unevenness of the piston is ensured accordingly. I have.

On the other hand, on the back side of the connecting portion of the liquid cylinder portion 3d to the air cylinder 3c, an annular seal projection 3f is formed so as to protrude upward in the air cylinder 3c, and is conveyed and stored. In some cases, a pneumatic piston, which will be described later, is fitted to the seal projection 3f so that the hermetically sealed state can be maintained. Further, the inner peripheral surface of the seal projection 3f is formed in a mortar shape as shown in the drawing, and is continuously formed so as to transition to the inner peripheral surface of the liquid cylinder portion 3d.
Consideration is given to insert and assemble 3 into liquid cylinder portion 3d without being easily caught.

On the other hand, the guide cylinder 3c ₁ of the air cylinder 3c
Is provided with an outside air introduction hole 3g for introducing outside air into the container 1 through the inner screw portion 14a of the small lid 14, which corresponds to the volume in which the foamable liquid A is consumed. By introducing outside air into the container 1 through the outside air introduction hole 3g, the inside of the container 1 is prevented from becoming negative pressure. An annular seal body 2 made of a soft resin that maintains a sealed state is interposed between the flange 3b of the double cylinder 3 and the open end 1b of the container 1. The sealing member 2 is closed and the annular portion 2c fitted in the upper outer peripheral surface of the guide cylinder portion 3c ₁ of the air cylinder 3c, the sealing portion 2a by closing the screw with respect to the container 1 of the large lid 15 and the role of packing A thin tongue portion 2b serving as a valve plugging the outside air introduction hole 3g is provided in a part of the seal member 2 to secure the state.
Is formed in a shape that obtains a biasing force against the air cylinder 3c. The tongue 2b is elastically deformed and opened only when the above-described outside air is introduced, and otherwise, the tongue 2b is always opened.
g is closed to prevent the liquid A from leaking into the air cylinder 3c from the outside air introduction hole 3g when the container is transported or stored.

As is well known, the bottom portion 1c of the container 1 is formed to be deeper to improve the seating of the container and increase the strength, while consuming the foamable liquid A and lowering the liquid level W as shown in the figure. Even so, liquid can be absorbed through the hollow liquid absorbing tube 4 to the end.

On the other hand, the liquid cylinder portion 3d of the double cylinder 3
Is formed to extend downward, and ends with a lower hole 3i having a reduced diameter, and the upper end 4a of the liquid suction pipe 4 is press-fitted into the lower hole 3i. A ball pedestal 3j is formed inside the stepped portion between the lower hole 3i and the liquid cylinder 3d and is made of a stainless steel ball or the like and has excellent corrosion resistance.
A ball 8 is set movably at positions shown by solid lines and broken lines. A plug 5 is further provided in the liquid cylinder portion 3d so as to cover the ball pedestal 3j as shown in the figure, and the second ball 8 is restricted to a position shown by a broken line in FIG. An annular pedestal portion 5c serving as a receiving portion of a coil spring 6 for providing a repulsive force against a pressing force of an injection nozzle body described later is provided. A stopper 5a is formed on the head of the stopper 5, and the stopper 5a is fitted into the liquid guide hole 13b of the sliding seal body 13 forming a piston, so that the stopper 5a can be transported or stored. To prevent the liquid A from leaking. An opening 5b is formed between the plug portion 5a and the pedestal portion 5c. When the second ball 8 moves to the position shown by the broken line, the liquid A flows through the opening 5b into the liquid cylinder portion 3d. To be introduced.

Referring again to FIG. 5, the portion corresponding to the piston of the pump assembly is integrally slid vertically in the air cylinder 3c and the liquid cylinder 3d of the double cylinder 3 described above. It is. For this, the air piston 10 was set to (specifically the inner wall surface of the cylinder portion 3c ₂₎ the inner wall surface of the air cylinder 3c can be secured sufficiently airtight when sliding up and down with the sealed state A pair of upper and lower sliding seal portions 10j and a hat-like body provided with an air chamber portion 10i are formed, and a hollow rod portion 10a is further integrally formed upward from a central portion of the air chamber portion 10i. ing. Further, as shown in the figure, the sliding seal portion 10j of the air piston 10 contacts the inner wall surface of the air cylinder 3c at two upper and lower locations, so that even if the user presses the air piston 10 obliquely. A sealed state is ensured,
As a result, the mixing ratio of air and liquid is kept constant.

On the other hand, the liquid piston 12 is press-fitted into the air piston 10 and is integrally fixed so as to be able to move integrally. The liquid piston 12 is formed of a cylindrical body as shown in the drawing to guide the liquid into the inside, has a ball pedestal 12b for holding the first ball 7 on the upper part, and has an opening 12c communicating with the liquid guiding part 12a. Provided.

The first ball 7 has a small coil spring 20
Is normally positioned at the position indicated by the solid line in the drawing, but during the use operation described below, the first ball is pressed by the pressure of the liquid A introduced into the liquid guide portion 12a, so that the small coil spring 20 is compressed and the first coil is compressed. As a result of the ball 7 moving to the position shown by the broken line and the opening 12c communicating with the mixing chamber 11,
The liquid is sent into the mixing chamber 11. Here, this first
Although the ball 7 can be positioned on the ball pedestal 12b only by its own weight, the provision of the small coil spring 20 prevents liquid leakage when the container 1 falls down.

On the other hand, at the lower end of the liquid piston 12, a press-fitting portion 1 of a sliding body 13 having a sliding seal portion 13c which slides in the liquid cylinder 3d while maintaining an airtight state in a vertical direction.
3a is press-fitted as shown. The sliding body 13 is fitted into the stopper 5a of the stopper 5 to maintain an airtight state, and the liquid introduction hole 1 serving as a flow path for introducing a liquid.
3b is provided. Further, the sliding seal portion 13
The upper end of the above-described coil spring 6 is in contact with the lower side of c, so that the integrated body of the air piston 10 and the liquid piston 12 can be urged to move to the position shown in the figure.

Next, the rod portion 10a of the air piston 10
The ejection nozzle body 17 is press-fitted into the end 10e and is integrally fixed thereto. For this purpose, a press-fit hole 17f having a concave portion is formed in the ejection nozzle body 17 so that the convex portion of the rod portion 10a can be fitted and fixed. A mixing chamber 11 that mixes liquid and air to generate bubbles is formed at the upper end of the rod portion 10a so as to also serve as a housing chamber for the small coil spring 20 described above. An opening hole 10c for ejecting a bubble generated by mixing air and liquid into a mesh body, which will be described later, is provided at a position above the center of the mixing chamber 11,
A small coil spring 20 is provided around the opening 10c.
The rib 10d for arranging at the center is radially formed. Below the rib 10d, a plurality of air flow paths 10f for guiding the air in the air chamber 10i of the air piston 10 are formed radially. A seal portion 10h that fits into the seal protrusion 3f of the double cylinder body 3 is formed in the vicinity of the lower open portion of the air flow passage 10f, so that the seal portion 10h can be fitted and sealed.

Next, a check valve for introducing outside air, which acts when introducing outside air, is integrally provided on the upper wall of the air piston 10. This check valve has a check valve portion 10k in which the third ball 9 is movably incorporated at positions shown by solid lines and broken lines.
And an opening 10L which is open above the check valve portion 10k and is closed when the third ball 9 moves upward.
And the third ball 9 is held at the position shown by the solid line in FIG.
And a stopper 10m that allows the outside air to be introduced through 0L.

On the other hand, the rod 10a of the air piston 10
Are guided with a gap between the outer peripheral surface thereof and the inner peripheral surface of the opening 14d of the small lid 14 (a groove 14e is formed on the air piston side at a position corresponding to the lower end of the opening). The outside air is introduced into the check valve composed of the third ball 9 through a gap including the groove 14e. However, the groove 14e may be provided at the lower end of the opening 14d.

Next, the press-fit hole portion 1 of the above-described ejection nozzle body 17 will be described.
7f is a mesh of about 200 mesh / inch using a polyester fiber as a porous material and having a thickness of 0.0
The ejection nozzle body 17 is press-fitted after two 6 mm nets 18 are interposed above and below the spacer 19. The diameter of the foam is determined by the count of the mesh 18 and the bubbles having a random diameter in the mixing chamber 10b are turned into fine uniform bubbles by passing through the mesh 18 so as to form a uniform foam. It can be ejected to the outside through the hole 17b and the bubble passage 17a. This net 18 may be one sheet. In addition, as the net 18, a nylon, polyethylene, polypropylene, carbon fiber or stainless steel wire may be used, and a net having a thickness of 20 to 400 mesh / inch and a thickness of 0.01 to 2 millimeters may be used. Is good. Preferably, a mesh of 50 to 300 mesh / inch and a thickness of 0.03 to 0.5 millimeters is preferred.

Also, instead of the net 18, 0.03 to 0.5
Thickness with many small holes of the size of Milliemel is 0.01
Or a 2 mm mail disk-shaped body injection molded with a thermoplastic resin such as polyethylene or polypropylene,
It is also possible to use a sintered compact having the same small hole and thickness or an etched metal plate.

On the other hand, an external thread 17d of a male thread is formed outside the press-fit hole 17f of the ejection nozzle body 17,
The outer screw portion 17d can be screwed into the inner screw portion 14a which is a female screw portion of the small lid 14, so that a sealed state (that is, a locked state) is ensured during long-term storage or transport. Considered to be able to. For this purpose, the opening 1 formed below the inner screw portion 14a
The dimensional relationship between the inner diameter of 4d and the outer diameter of the outer peripheral portion 17e formed below the outer screw portion 17d is slightly larger than the outer diameter of the outer peripheral portion 17e. When screwed into the internal thread portion 14a, which is a female thread portion of the body 14, the outer peripheral portion 17e is fitted into the opening portion 14d so that the upper space of the air cylinder can be kept airtight.

The operation of the container having the above structure is explained as follows. FIG. 7 is a longitudinal sectional view of the foam ejection pump container in a locked state.

In FIG. 7, the liquid is contained in the container up to the liquid level W, and the liquid contacts the parts so that the liquid does not leak when the liquid is not in use, such as when being transported or displayed in a store. The parts are brought into pressure contact to ensure a sealed state. In order to make this state, the nozzle body 17 is pressed against the small lid body 14 against the urging force of the coil spring 6, and is rotated so that the external screw 17d is screwed with the internal screw portion 14a.

As a result, the first seal portion S1 in which the plug portion 5a of the plug 5 is fitted in the liquid guide hole 13b of the slide 13 fixed to the liquid piston 12, and the seal of the double cylinder 3 A fifth seal portion S5 in which the projection 3f fits into the seal portion 10h of the air piston 10, and an outer peripheral portion 1 of the ejection nozzle body 17;
7e is the fourth seal portion S fitted into the opening 14d of the small lid 14.
4 are formed respectively.

On the other hand, the large lid 15 is screwed into the container 1 via the seal 2 to form the second seal portion S2.
The seal body 2 is integrally formed with a thin tongue portion 2b, and the tongue portion 2b forms a third seal portion S3 for closing the outside air introduction hole 3g. Since the hermetically sealed state is ensured by the above-described first to fifth seal portions, leakage of the content liquid does not occur when the container is transported or stored.

Referring to FIGS. 5 and 6, the procedure for ejecting foam by the foam ejection pump container constructed as described above is to first release the locked state of FIG. When the ejection nozzle body 17 is pushed downward in a state where the liquid A is not introduced into the liquid guide portion 12a, the first ball 7 is raised due to an increase in the internal pressure of the air cylinder and the liquid cylinder.
And the third ball 9 rises to the position shown by the broken line, and only the second ball 8 remains at the position shown by the solid line.

Then, when the hand is released from the jet nozzle body 17,
The air piston 10 is actuated by the restoring force of the coil spring 6.
And the liquid piston 12 rises. At this time, the inside of the liquid cylinder portion 3d becomes negative pressure and the first check valve made of the first ball 7 is closed, and then the inside of the liquid cylinder portion 3d is made further negative pressure and the second ball 8 made of the second ball 8 is formed. (2) The check valve opens and the liquid A is sucked into the liquid cylinder. At the same time, the inside of the air chamber 10i also becomes a negative pressure, and the third check valve formed of the ninth ball opens, so that the outside air passes between the rod 10a and the opening 14d of the small lid 14 and the groove 14e. The air is sent into the air chamber 10i without resistance to prepare for the ejection of bubbles.

Then, when the piston body is lowered again, the outside air introduced into the air chamber 10i of the air cylinder is pressurized to close the third check valve. As a result, the air chamber 1
The air that has lost its place within 0i is pressurized and
It rises through f and is sent into the mixing chamber 11. At the same time, the liquid A in the liquid cylinder portion 3d is also pressurized and rises through the liquid guide portion 12a to open the first check valve formed of the first ball against the coil spring 20 to form the mixing chamber. 11
Sent to

As a result, the liquid A and the air are mixed in the mixing chamber 11 and foamed to generate bubbles having random diameters. As a result, the gas is ejected from the ejection nozzle 17 to the outside.

At this time, since the inside of the container is under negative pressure due to the decrease in the consumption of the liquid A, the tongue 2b elastically deforms outward to open the outside air introduction hole 3g, and the outside air flows from the outside air introduction hole 3g. The air is sucked into the upper space in the container and the negative pressure state in the container is released, and then the tongue 2b closes the outside air introduction hole 3g. Thereafter, by further moving the piston body up and down, the gas-liquid mixture ratio is always constant, and stable bubbles are ejected.

Thus, according to this container, (a) the resistance at the time of introducing outside air can be reduced, the up-and-down movement of the piston body can be made smooth, and the liquid component of the foam remaining in the mesh is dried and solidified to form the porous body. There is no clogging, and the amount of air introduced into the air cylinder can be kept constant and the mixing ratio with the liquid can be kept constant. (B) Also, when the foam ejection pump container is not used In the equi-locked state, the nozzle body can be screwed into the lid body to make the airtight state. (C) In addition, since there is a configuration in which air is taken into the air cylinder from outside of the container, There is no need to secure a useless space, the liquid can be stored up to the vicinity of the outside air introduction hole in the upper part of the cylinder, and (d) after the foam is generated in the mixing chamber 11, the sheet-like net 18 Is more uniform, Clogging after foam injected into the body 18 is triggered by a factor unexpected in addition to net body 18 is thin,
At the next injection, the clogged part is dissolved with the liquid that forms bubbles, eliminating clogging.In addition, since outside air is introduced through the gap, there is no effect on the vertical movement of the piston. Have been.

[045]

The container shown in FIGS. 5, 6 and 7 has a unique structure, as described in detail.
Although it has an effect and is sufficiently significant, it was later found that it had the following problems.

That is, if the locked state is released and the nozzle body and the piston body are left in the unlocked state where they are raised,
Changes in environmental temperature-For example, if the product is left in the same room throughout the day or night, or if it is used in a heated room and then stored in a washroom, the container should be placed in an environment with a temperature difference of 10 ° C or more. Has been found to be affected unexpectedly.

When the environmental temperature rises, for example, from 5 ° C. to 20 ° C., the volume of the air and the contents inside the container expands, and the pressure inside the container rises. Ascending in the part 12a, pushing up the check valve ball 7,
The air flows in the air flow path 10f in the reverse direction and is stored in the air chamber 10i of the air cylinder. However, when the stored amount increases, the stored liquid is extruded through the passage 10f together with the air to be extruded during subsequent use. As a result, the state of the generated bubbles is sent to the mixing chamber 11, and the state of the generated bubbles changes (the liquid becomes an increased liquid ratio, or in some cases, the air flow path 10f is blocked, and only the liquid comes out). .

Further, the content liquid passes through the mixing chamber 11 and flows through the bubble passage 1.
Overflow "liquid dripping" may occur from 7a.

On the other hand, when the temperature drops, the inside of the container becomes a negative pressure. If the sealing property of the check valve ball 8 at the lower end of the liquid cylinder is not perfect, the liquid in the cylinder portion 3d will be sucked into the container. Therefore, at the time of the next bubble ejection (that is, at the time of use), the amount of liquid to be sucked is reduced, and the amount of discharged foam is reduced.

[050] Of course, as a means to prevent the container becomes negative pressure, the guide tube portion 3c ₁ of the air cylinder 3c,
An outside air introduction hole 3g having a seal body 2 is provided,
The thin tongue 2b of the seal body 2 serves as an operating valve, and the hole 3
g is opened and closed, but if the degree of negative pressure is low, this operating valve may not work as intended, while the check valve ball 8 of the liquid cylinder portion is held by its own weight. Therefore, a slight negative pressure in the container is sucked back into the cylinder.

Since such difficulties were found, it was necessary to make further improvements.

[052]

According to the present invention, a part of the structure of the container shown in FIGS. 5 and 6 is improved to maintain the advantages (described above) of the container and to solve the above-mentioned difficulties. It is a thing.

[053] In the present invention the container, without using the sealing member 2 constructed as described above, but instead, the inner diameter of the cylinder portion 3c ₂ (b) air cylinder 3c, smaller than the inner diameter of the guide tube portion 3c ₁ , (b) the outer diameter of the sliding seal of the air piston 10 is a small than the inner diameter of the guide cylinder portion 3c _1, large cities than the inner diameter of the cylinder portion 3c _2, (c) air introduction provided holes 30G at the top of the cylinder portion 3c _2, the sliding seal portion (d) air piston, always, i.e., the lock time, regardless of the time of non-lock, the cylinder portion below the said inlet hole 30G intimate contact with the lower sliding seal portion 10jL which moves up and down, the locked state is in contact closely with the introduction hole 30G from above of the air cylinder portion 3c _2, in the non-locked state, the upper end of the cylinder portion 3c ₂ and Higher than the guide cylinder 3c ₁ It is characterized by comprising an upper sliding seal portion 10jU in which an air passage P is formed. Other configurations are the same as those shown in FIGS.

[0514]

According to the present invention, in the unlocked state, since the outside air introduction hole 30G is reliably opened so that the inside of the container and the outside of the container communicate with each other, the pressure inside the container changes due to a change in the environmental temperature. Nothing.

[0555]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view showing a state where the nozzle portion is at the highest position in an unlocked state. FIG. 2 is a sectional view showing a state where the nozzle portion is pushed down and the piston body is also pushed down.
FIG. 3 is a sectional view of the locked state.

In these figures, the same parts as those in FIGS. 5 to 7 are denoted by the same reference numerals and symbols. This is because the container of the present invention is a modification of the container shown in FIGS. Therefore, the following description focuses on the characteristic structure of the present invention.

[058] As can be seen, the outside air introduction hole is, in FIG. 5, is provided in the guide tube portion 3c in the _first air cylinder 3c, the sealing member 2 so as to be able to close it intervene in the annular and although, in this embodiment, is in the upper portion of the cylinder portion 3c _2, indicated by 30G.

[059] Also, the dimensions of the guide cylinder portion 3c ₁ and its lower cylinder portion 3c ₂ of the cylinder 3c is that the former inner diameter is in larger than that of the latter is similar to that of FIG. 5 But the sliding seal part of the air piston 10 is the upper part 10j
Divided into U and the lower 10JL, an outer diameter, but smaller than the inner diameter of the guide tube portion of the air cylinder, is different from that determined larger than the inner diameter of the cylinder portion 3c _2.

Further, the sliding seal portions 10jU, 10jU,
jL has a position and a shape such that the sliding seal portion 10j in FIG. 5 does not always close the introduction hole 3g regardless of whether it is locked or unlocked. The lower sliding seal part 10jL is always the cylinder part 3c.
_The upper sliding seal portion 10jU is in a locked state (FIG. 3), but does not move beyond the inlet hole 30G in close contact with the lower sliding seal portion 10jU.
in cooperation with jL, in order to close the introduction hole 30G, the introduction and hole 30G cylinder portion 3c ₂ and the intimate contact at from above, but the piston body 10, 12 is pulled, the non-locked state (FIG. 1, FIG. When in 2), the air cylinder 3
than c ₂ above, is in a position to face the guide cylinder portion 3c _1, this time, as described above, since the outer diameter of the seal portion has a smaller than the inner diameter of the guide tube portion, the seal An air passage P communicating with the introduction hole 30G is formed between the section and the air cylinder 3c.

[061] Note that the upper sliding seal portion 10Ju, when in the unlocked state, may be in a position facing the tapered portion between the guide tube portion 3c ₁ and the air cylinder portion 3c _2.

In this example, the sliding seal portions 10jU, 10jL
Are provided at the upper and lower ends of the intermediate portion 10jM that connects them. In this case, of course, the intermediate portion 10
the outer diameter of jM is smaller than the inner diameter of the air cylinder portion 3c _2, in the portion parallel with the cylinder portion 3c _2, so as not to inhibit the formation of the air passage P leading to the introduction hole 30G.

Incidentally, this sliding seal portion is, as shown in FIG.
Not limited to both ends of the intermediate portion 10jM, if the formation of the air passage P when unlocking and the closing of the introduction hole 30G during locking are ensured, it may be provided in the middle.

[064]

With such a structure, in the unlocked state, the inside and outside of the container are connected to the outside air introduction hole 30G → the air passage P → the groove 14e and the inner peripheral surface of the small lid opening 14d and the air piston rod. Since it is always communicated through the path of the gap with the outer peripheral surface of the portion 10a, even if the environmental temperature changes,
The pressure in the container does not change, and as a result, there is no liquid pool in the air cylinder and the change in the state of the spouted bubbles, and there is no "dry shot" or "drip".

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of the container of the present invention in an unlocked state, in which a nozzle portion is at a highest position.

FIG. 2 is a cross-sectional view also in an unlocked state, but a nozzle portion is pushed down.

FIG. 3 is a cross-sectional view of an example of the container of the present invention in a locked state.

FIG. 4 is an explanatory view showing another embodiment of the sliding seal portion of the air piston in the container of the present invention.
(B) shows the state at the time of locking.

FIG. 5 is a cross-sectional view showing an upper half of a container to be improved according to the present invention when the container is unlocked.

FIG. 6 is a sectional view showing a lower half of the same.

FIG. 7 is a cross-sectional view of the container to be improved when the container is locked.

[Explanation of symbols]

A Liquid 3 Double cylinder 3c Air cylinder 3c ₁ Guide cylinder 3c ₂ Air cylinder 3d Liquid cylinder 3e Bottom surface 4 Suction pipe 6 Energizing spring 7 First ball 70 First check valve 8 Second ball 80 Second check valve 9 Third ball 10k Third check valve 10 Air piston 10a Hollow rod 10f Air flow path 10i Air chamber 10iU Upper sliding seal 10jL Lower sliding seal 11 Mixing chamber 12 Liquid piston 12a Liquid part (liquid flow path) 14 Small lid 14d Opening 14e Groove 15 Large lid 17 Nozzle body 18 Net (porous body) 30G External air introduction hole P Air passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 39/00-55/16 B05B 11/00 101

Claims (1)

(57) [Claims] 1. A double cylinder comprising an air cylinder for an air pump and a liquid cylinder for a liquid pump provided concentrically inside an opening of a container containing a liquid; A liquid suction pipe for communicating the bottom of the cylinder for use with the bottom of the container, and concentrically move the piston for air and the piston for liquid which move up and down in the cylinder for air and the cylinder for liquid respectively and have a sliding seal. A piston body integrally provided in a shape, a nozzle body having a hole for foam ejection provided at an upper end of the piston body, an air flow path communicating the hole with the inside of the air cylinder, A liquid flow path for communicating the inside of the liquid cylinder with the hole, a first check valve disposed in the middle of the liquid flow path, and a second check disposed in the liquid cylinder A valve and a sheet-like member arranged in the hole A mixing chamber in which liquid and air are mixed at a junction where the liquid flow path and the air flow path are merged on the front side of the porous body and the location where the sheet-shaped porous body is disposed; and A biasing spring for biasing the double cylinder toward the top dead center is formed in the air cylinder to communicate between the inside of the container and the outside of the container to prevent negative pressure inside the container. An external air introduction hole, and a lid for fixing the double cylinder to the container and guiding the piston through the piston, and further, a sliding seal portion is provided on the air piston and the liquid piston of the piston body. , And
In order to introduce outside air into the air chamber formed by the air cylinder and the air piston through a gap between the outer peripheral surface of the air piston and the lid, a third check valve is provided to the air piston. The air piston and the nozzle body are provided in a foam ejection pump container configured to be screwable against the urging spring. A sliding portion of the air piston, the outer diameter of which is smaller than the inner diameter of the guiding tube portion, and the inner diameter of the cylinder portion. The outside air introduction hole is a hole provided in the upper part of the cylinder portion of the air cylinder, and the sliding seal portion of the air piston always has the air cylinder below the introduction hole. Lower slide that moves up and down in close contact with the part In the locked state, the seal portion and the air cylinder portion are in close contact with the air cylinder portion above the introduction hole. However, in the unlocked state, the sealing portion is located above the air cylinder portion, and is in contact with the guide cylinder portion of the air cylinder. A foam ejection pump container comprising an upper sliding seal portion which does not prevent an air passage from being formed between the air cylinder portion and a connection portion between the air cylinder portion and the guide cylinder portion.