JP2007137497A - Foam discharging type pump dispenser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foam discharging type pump dispenser which has less wear while having no sliding sections, and also, is structurally simple as well. <P>SOLUTION: This foam discharging type pump dispenser 1 mixes a liquid L in a container 2 and air A on the outside of the container. The foam discharging type pump dispenser 1 has a liquid pumping means for discharging the liquid L to the outside by sucking it up through an introduction flow passage S1 and also, through a discharging flow passage S3, and an air pumping means for taking in the air A and feeding it into the discharging flow passage S3. In this case, the liquid pumping means has a liquid pumping section 3, a first check valve 4 which is provided on the border between the introduction flow passage S1 and a pump space S21, and a second check valve 5 which is provided on the border between the pump space 21 and the discharging flow passage S3. Also, the air pumping means has an air pumping section 6, and a third check valve 7 which is provided on a suction port for the air A. Then, a fourth check valve 15 is provided so that the mixed fluid of the liquid L and the air A may not enter a pump space S22 from the discharging flow passage S3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a foam discharge pump dispenser that mixes liquid contained in a container and air outside the container.
More specifically, the present invention relates to a foam discharge type pump dispenser that mixes cleaning liquid and air and foams and discharges it, so that there is no sliding contact part that exists when a cylinder and a piston are used, and there is little wear and structure. The present invention relates to a simple foam discharge type pump dispenser.

2. Description of the Related Art Conventionally, there is known a foam discharge type pump dispenser that pushes a nozzle head, slides a piston along the inner wall of a cylinder, and sucks cleaning liquid in a container when the piston moves up (see, for example, Patent Document 1).
In this dispenser, when the nozzle head is pushed in again, the cleaning liquid inside the cylindrical piston and the air in the cylinder are mixed to form a bubble and ejected from the nozzle.

Japanese Patent Laid-Open No. 10-324357

However, in such a conventional foam discharge pump dispenser using a cylinder and a piston, the piston needs to perform a linear motion while maintaining liquid tightness with respect to the cylinder.
In order to perform smooth piston movement while maintaining liquid tightness, the mechanical accuracy of the sliding contact portion between the cylinder and the piston must be increased, and there is a problem that the molding process of the cylinder and the piston takes time. It was.

Further, since the sliding contact portion is provided, friction is generated between the piston and the cylinder, and durability and the like are problematic.
That is, there is a problem that the proper function of the pump dispenser cannot be guaranteed if the piston or the like is worn and damaged.
Further, since a spring is necessary to return the piston, there is a problem that the number of parts is increased and the structure is complicated.

The present invention has been made to solve the above-described problems.
That is, an object of the present invention is to provide a foam discharge type pump dispenser which has no sliding contact portion, has little wear and is structurally simple.

  Thus, as a result of earnest research on the background of such problems, the present inventor can solve the above-mentioned problems by using an elastic pump part instead of using a piston and a cylinder. The present invention has been found out and the present invention has been completed based on this finding.

  That is, the present invention relates to (1) a foam discharge pump dispenser that mixes liquid stored in a container and air outside the container, and sucks and discharges the liquid stored in the container via an introduction channel. A liquid pump means for discharging the liquid to the outside via a flow path; and an air pump means for taking in air outside the container and sending the air into the discharge flow path. Includes a liquid pump portion that generates positive pressure and negative pressure by elastic deformation and restoring deformation, a first check valve provided at a boundary between the introduction flow path and the pump space of the liquid pump portion, and the liquid A second check valve provided at a boundary between the pump space of the pump section and the discharge flow path, and the air pump means is deformed in synchronism with deformation of the liquid pump section to generate positive pressure and negative pressure. Air pump part that generates A third check valve provided at an air inlet of the air pump unit, and a mixed fluid formed by mixing the liquid and the air is supplied from the discharge passage to the pump space of the air pump unit. It exists in the foam discharge type pump dispenser which provided the 4th check valve so that it may not penetrate.

    In the present invention, (2), the liquid pump portion is axisymmetrically shaped, and when the liquid pump portion is pressed, the liquid pump portion is elastically deformed while maintaining the axially symmetric shape. It exists in the foam discharge type pump dispenser of description.

  Further, the present invention is as described in (3) above, wherein the air pump part has a substantially axisymmetric shape, and when the air pump part is pressed, the air pump part elastically deforms while maintaining a substantially axisymmetric shape. In the foam discharge pump dispenser.

  According to the present invention, (4), the liquid pump portion is axisymmetrically shaped, the air pump portion is substantially axisymmetrically shaped, and the liquid pump portion and the air pump portion are arranged on a concentric axis. It exists in the foam discharge type pump dispenser as described in (1).

  Further, according to the present invention, (5) the liquid pump unit and the cap attached to the container are fitted and fixed to each other, and when the liquid pump unit is elastically deformed, the liquid pump unit and the cap The bubble discharge pump dispenser according to the above (1), in which a gap is formed in a fitting portion with the cap, and the pump space of the liquid pump unit and the space in the container communicate with each other.

  In addition, as long as the objective of this invention is met, the structure which combined the said invention suitably is also employable.

In the foam discharge type pump dispenser of the present invention, when the nozzle head or the like is pushed in and the liquid pump portion is pressed and elastically deformed (volume reduction) to generate a positive pressure in the pump space, the second reverse is applied to eliminate the positive pressure. The stop valve is opened and liquid flows out of the pump space.
On the other hand, if the pressure of the liquid pump part is released and a negative pressure is generated in the pump space by restoring deformation of the liquid pump part, the first check valve is opened to eliminate the negative pressure, and the liquid is discharged into the pump space. Flows in.
By adopting such a structure in which the liquid flows out by elastic deformation of the pump part and the liquid flows in by restoring force (volume expansion), a cylinder and a piston are not required, and a spring is not required, which is structurally simple. Become a thing.

Further, since the sliding contact portion between the cylinder and the piston is eliminated and wear is reduced, the movement of the nozzle head and the like becomes smooth and failure is less likely to occur.
Further, since the liquid pump part is deformed in synchronism with the air pump part, that is, both pump parts are deformed by a single push of the nozzle head or the like, the outflow of liquid from the pump space of the liquid pump part to the discharge passage At the same time, the air in the pump space of the air pump unit is sent to the discharge flow channel, and the liquid and air are mixed to form a foam-like fluid and discharged from the nozzle.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of the foam discharge pump dispenser of the present invention.
The foam discharge pump dispenser 1 of this embodiment is of a type that mixes foamable liquid L contained in a container 2 with air A outside the container.
Examples of the foamable liquid L include kitchen and window glass cleaning liquids and cosmetic liquids.
The pump dispenser 1 also includes liquid pump means for sucking up the liquid L contained in the container 2 through the introduction flow path S1 and discharging the liquid L to the outside through the discharge flow path S3.

This liquid pump means has a liquid pump section 3 that generates positive pressure and negative pressure by elastic deformation and restoring deformation.
In order for the liquid pump unit 3 to function as a pump, the liquid pump unit 3 includes a material that is elastically deformed and has a high durability, such as synthetic rubber (SBR, BR, CR, IIR, EPM, NBR, etc. ) And elastomers (EVA, TPS, TPO, TPEE, TPEA, TPE, etc.) are applied.

The liquid pump means includes a first check valve 4 provided at the boundary between the introduction flow path S1 and the pump space S21 of the liquid pump section 3, and a boundary between the pump space S21 of the liquid pump section 3 and the discharge flow path S3. And a second check valve 5 provided in the first.
Further, the pump dispenser 1 includes air pump means for taking in air A outside the container and sending this air A into the discharge flow path S3.

The air pump means includes an air pump unit 6 that generates a positive pressure and a negative pressure by being deformed in synchronism with the deformation of the liquid pump unit 3, and a third check valve provided at the air A inlet of the air pump unit 6. 7.
The air pump unit 6 is disposed on a concentric shaft with the liquid pump unit 3, and preferably, for example, the same material as the liquid pump unit 3 is used.

The lower ends of the liquid pump unit 3 and the air pump unit 6 are fitted and fixed to a groove or the like on the upper surface side of the cap 8, so that the liquid pump unit 3 and the air pump unit 6 and the cap 8 are fitted to each other. It is fixed.
That is, more specifically, a small cylinder portion 8a extending downward is formed at the center of the cap 8, and the lower end side of the liquid pump portion 3 is fitted to the upper end side of the small cylinder portion 8a. .
In addition, an annular groove portion 8 b for fitting the lower end of the air pump portion 6 and attaching the air pump portion 6 is formed on the outer peripheral side of the upper surface of the cap 8.

A tube 9 is attached to the lower end of the small cylinder portion 8a, and an introduction flow path S1 is formed by the tube 9.
Further, a slightly larger diameter hanging portion 8c is formed at the outer peripheral end of the upper surface of the cap 8, and the lower end of the nozzle head 10 is locked to the hanging portion 8c.
The nozzle head 10 includes a main body 10a having substantially the same diameter as the cap 8 and a nozzle head 10b that forms the discharge flow path S3.
In addition, the shape of the upper end surface of the nozzle head 10 is a flat curved surface in order to make it easy to push downward.

FIG. 2 is an enlarged view of the vicinity of the second check valve 5 and the third check valve 7 of FIG.
As shown in the figure, the second check valve 5 is seated on a valve seat member 11 that is fitted to the upper end of the liquid pump portion 3.
A fourth check valve 15 into which the second check valve 5 is inserted is provided on the center side of the valve seat member 11.

An annular groove 11a is formed on the upper surface side of the valve seat member 11, and an annular protrusion 12a formed on the lower surface side of the cylindrical mesh member 12 is fitted in the annular groove 11a.
On the inner side of the cylindrical portion of the mesh member 12, a raised portion having a shape rising toward the center side is formed, and a mesh portion 12b is formed in the center.
The mesh portion 12b may be attached and fixed as a separate member.

When sticking and fixing, for example, a polyamide sheet having a mesh can be used.
A mesh sheet 13 is attached and fixed to the opening end on the upper end side of the mesh member 12.
A polyamide sheet can also be used for the mesh sheet 13, but the mesh is made finer than the mesh portion 12b.
For example, a polyamide sheet having a mesh is used.

A cylindrical air intrusion portion 6a is formed at one location on the upper end of the air pump portion 6, and a cylindrical air intrusion portion 6a is used as a device for effectively acting the third check valve 7 on the air intrusion portion 6a. A stay 14 is provided.
A third check valve 7 is provided inside the stay 14.

Now, when the nozzle head 10 of the pump dispenser 1 of FIG. 1 is pushed in, the guide groove 10a1 formed in the main body portion 10a fits into the hook portion 8c of the cap 8 and slides.
The guide grooves 10a1 are formed at four positions around the center of the nozzle head 10 at intervals of 90 degrees, and each guide groove 10a1 has a certain width.
The hook 8c of the cap 8 is formed at four locations corresponding to the guide groove 10a1, and the width of the hook 8c is the same as the width of the guide groove 10a1.
Therefore, the nozzle head 10 slides stably along the vertical direction.

FIG. 3 shows a state in which the nozzle head 10 of the pump dispenser 1 of FIG. 1 is pushed down to a half depth.
At this time, the liquid pump unit 3 and the air pump unit 6 are deformed so as to be crushed and compress the internal air.
More specifically, each of the liquid pump unit 3 and the air pump unit 6 has an axisymmetric shape, and the nozzle head 10 slides stably along the vertical direction, so that it elastically deforms while maintaining the axially symmetric shape. .

When the air in the liquid pump part 3 is compressed, the pump space S21 becomes positive pressure and the first check valve 4 is pressed downward, but is seated on the valve seat part 8a1 of the small cylinder part 8a. The position of the check valve 4 does not change.
The second check valve 5 is pressed upward, moves upward, and contacts the mesh member 12.
The third check valve 7 is pressed upward and moves upward, and comes into contact with the upper end opening of the stay 14 as shown in FIG.

FIG. 4 shows an enlarged view of the vicinity of the second check valve 5 and the third check valve 7 of FIG.
As shown by the arrows in the figure, the air A in the pump space S22 of the air pump unit 6 enters the gap between the outer peripheral surface of the cylindrical air intrusion portion 6a and the outer peripheral surface on the upper end side of the valve seat member 11, It passes near the upper surface of the seat member 11 and enters the inside of the cylindrical mesh member 12 to reach the outer peripheral surface of the fourth check valve 15.
The fourth check valve 15 is flexible, and the upper end side thereof is formed into a thin cylindrical shape. The thin cylindrical portion 15a is deformed to allow the air A to pass therethrough.
The air A that has passed through the cylinder portion 15a collides with the second check valve 5 that is pushed up by the compressed air in the pump space S21 of the liquid pump portion 3.

However, since the second check valve 5 is formed with a plurality of longitudinal slits 5 a along the circumferential direction, the air A that has passed through the cylindrical portion 15 a passes through the longitudinal slit 5 a and is located inside the second check valve 5. invade.
On the other hand, the air in the pump space S21 passes through the gap between the lower surface of the second check valve 5 and the surface of the valve seat member 11, and enters the second check valve 5 from the vertical slit 5a.

And both air merges inside the second check valve 5, flows out from the upper end side of the second check valve 5, reaches the mesh part 12b, and then passes through the mesh part 12b.
The air that has passed through the mesh portion 12b further passes through the mesh sheet 13, and then flows into the discharge passage S3 having a relatively large diameter and is discharged from the nozzle.
The discharge flow path S3 refers to a flow path after passing through the second check valve 5, and in particular, a flow path extending in an arc shape to the nozzle port is mainly used. And S3.
Similarly, the introduction flow path S1 refers to a flow path leading to the first check valve 4, but in the present embodiment, the first check valve 4 is provided in the vicinity of the tube 9, so In the form, the holes formed in the tube 9 occupy almost the entire introduction flow path S1.

When the flow of air A weakens, the cylinder portion 15a returns to its original shape, and the fourth check valve 15 is closed.
That is, the fourth check valve 15 is a mixture in which the liquid L and the air A are mixed when the liquid L is discharged from the pump space S21 of the liquid pump unit 3 as will be described later. It has a function of preventing fluid from entering the pump space S22 of the air pump unit 6 from the discharge flow path S3.

FIG. 5 is an enlarged view of the pump space S21 of the air pump unit 6 of FIG.
As shown in the figure, when the liquid pump part 3 is elastically deformed, a gap is formed in the fitting part between the cap 8 attached to the container 2 and the liquid pump part 3, and the pump space S21 of the liquid pump part 3 and the container The space in 2 communicates.
Specifically, due to the deformation of the liquid pump unit 3, the pump space S <b> 22 communicates with the inside of the container 2 through a negative pressure release hole 8 d formed on the inner peripheral end side of the upper surface of the cap 8.

  At this time, since the pump space S22 of the air pump unit 6 is set to a positive pressure by pushing the nozzle head 10, the air A enters the container 2 from the negative pressure release hole 8d in order to eliminate the pressure. The pressure in the container 2 temporarily becomes positive, but the positive pressure is canceled when the nozzle head 10 is raised and the liquid L is discharged from the container 2.

It is more effective to form the negative pressure release holes 8d at a plurality of places. For example, the negative pressure release holes 8d may be formed at two places around the center of the cap 8 with an interval of 90 degrees (270 degrees).
The gap is formed by the negative pressure release hole 8d not only when the nozzle head 10 is pushed in but also when it is pushed back.
Further, although depending on the shape of the air pump unit 6, a gap may be formed even when the air pump unit 6 is pushed in to the end.

FIG. 6 shows a state in which the nozzle head 10 of the pump dispenser 1 of FIG.
At this time, the liquid pump unit 3 and the air pump unit 6 are deformed so as to be largely crushed, and the compressed air inside is already discharged from the nozzle head 10.
The second check valve 5 falls due to its own weight and is seated on the valve seat member 11.
Since the air A passes through the fourth check valve 15 and the positive pressure in the pump space S22 of the air pump unit 6 is eliminated, the third check valve 7 falls due to its own weight and is open.
The fourth check valve 15 is returned to the closed state when the flow of air from the pump space S22 of the air pump unit 6 is weakened.

FIG. 7 shows a state in which the pushing of the nozzle head 10 of the pump dispenser 1 of FIG. 6 is canceled and the nozzle head 10 is rising.
At this time, since the liquid pump unit 3 and the air pump unit 6 are formed of an elastomer, the liquid pump unit 3 and the air pump unit 6 are in the process of being restored and deformed and returning to the same shape as the pump dispenser 1 of FIG.

Even during this restoring deformation, the hook portion 8c of the cap 8 relatively moves along the guide groove 10a1 formed in the main body portion 10a, so that the axially symmetrical shape is maintained.
Since the volume of the pump space S21 of the liquid pump unit 3 increases and becomes negative pressure, the second check valve 5 maintains the seated state on the valve seat member 11 while being sucked downward.
On the other hand, the first check valve 4 rises and comes into contact with the lower end of the liquid pump unit 3, the liquid L in the container 2 rises through the introduction flow path S1, and the first check valve 4 is immersed in the liquid L. Is done.

FIG. 8 shows an enlarged pump space S22 of the air pump unit 6 of FIG.
In the state of FIG. 8, since the pump space S22 is in a negative pressure, the position of the third check valve 7 is at a position where the air suction port is opened, and air A enters from the outside.

  When the nozzle head 10 is further raised from the state of FIGS. 7 and 8 and returned to the same position as in FIG. 1, the hook portion 8 c of the cap 8 and the locking projection 10 a 2 at the lower end of the nozzle head 10 are formed as shown in FIG. 9. Engage (engage).

FIG. 9 shows a state when the nozzle head 10 is pushed once and the nozzle head 10 returns to the original position.
At this time, the liquid L has entered the pump space S21 of the liquid pump unit 3.
The first check valve 4, the second check valve 5, and the fourth check valve 15 (see FIG. 2) are in a closed state, and the third check valve 7 is in an open state.

When the pushing of the nozzle head 10 is repeated, the pump space S21 is filled with the liquid L, and the liquid L is discharged from the pump space S21.
Then, the air A from the pump space S22 of the air pump unit 6 and the liquid L from the pump space S21 of the liquid pump unit 3 are mixed, resulting in a foamy mixed fluid as shown in FIG.

FIG. 10 shows where the mixed fluid is generated.
As shown in the figure, the liquid L enters the periphery of the second check valve 5 and then enters the second check valve 5 through the longitudinal slit 5a, and then enters the fourth check valve from the pump space S22. It mixes with air A sent through 15.
This mixed fluid is a liquid L containing air bubbles, and since the liquid L has a foaming property, it is made into a foam when passing through the mesh portion 12b.
The foamed mixed fluid is made into a finer foam by the mesh sheet 13 provided at the upper end of the mesh member 12.

  In the pump dispenser 1 of the above-described embodiment, when the nozzle head 10 or the like is pushed in and the liquid pump unit 3 is pressed and elastically deformed to generate a positive pressure in the pump space S21, the second reverse is applied to eliminate the positive pressure. The stop valve 5 is opened, and the liquid L flows out from the pump space S21. On the other hand, when the pressure of the liquid pump unit 3 is released and a negative pressure is generated in the pump space S21 by the deformation of the liquid pump unit 3, the first check valve 4 is opened to release the negative pressure, A fluid flows into the pump space S21.

If the structure in which the liquid L flows out by the elastic deformation of the liquid pump unit 3 and the liquid L flows in by the restoring force is adopted as described above, the cylinder and the piston are not required and the spring is not required, which is structurally simple. Become a thing.
Further, since the sliding contact portion between the cylinder and the piston is eliminated and wear is reduced, the movement of the nozzle head 10 and the like becomes smooth, and failure does not easily occur.

  In addition, since there is no cylinder, the volume occupied by the pump dispenser in the container is reduced, the volume of the liquid in the container is increased, and it is possible to prevent the dispenser user from feeling a loss of contents. The vicinity of the container mouth and the diameter of the pump dispenser can be reduced.

  Further, if the liquid pump unit 3 is deformed in synchronization with the air pump unit 6, that is, if both the pump units 3 and 6 are deformed by a single push of the nozzle head 10 or the like, the liquid pump unit 3 Simultaneously with the discharge of the liquid L from the pump space S21, the air A in the pump space S22 of the air pump unit 6 is sent into the discharge flow path S3, and the liquid L and the air A are mixed to become a foam fluid and discharged from the nozzle. Is done.

Further, in the pump dispenser 1 of the above-described embodiment, the liquid pump unit 3 has an axially symmetric shape, and when the liquid pump unit 3 is pressed, the liquid pump unit 3 is elastically deformed while maintaining the axially symmetric shape. The discharge function can be exhibited by a stable and regular shape change.
Therefore, the unstable discharge of the liquid L in which the flow of the liquid L in the discharge flow path S3 is different for each cycle can be avoided, and the bubble size when mixed with the air A is further stabilized.

Further, in the pump dispenser 1 of the above-described embodiment, the air pump unit 6 has a substantially axisymmetric shape, and when the air pump unit 6 is pressed, the air pump unit 6 is elastically deformed while maintaining the axisymmetric shape, so that it is stable every time. The air A can be pumped by a regular shape change.
Therefore, it is possible to avoid an unstable air A feeding in which the flow of the air A varies from cycle to cycle, and the size of the bubbles when mixed with the liquid L is further stabilized.

In the pump dispenser 1 of the above-described embodiment, the liquid pump unit 3 is axisymmetrical, the air pump unit 6 is substantially axisymmetrical, and the liquid pump unit 3 and the air pump unit 6 are disposed on a concentric axis. Therefore, when the nozzle head 10 or the like is pushed in, the two pump parts 3 and 6 can be reliably elastically deformed while maintaining the axially symmetrical shape.
Moreover, the liquid pump unit 3 and the air pump unit 6 do not interfere with each other.
The ratio of the air discharged from the air pump unit 6 and the liquid discharged from the liquid pump unit 3 is always stable.

Moreover, in the pump dispenser 1 mentioned above, weight reduction can be achieved by making all components resin.
Moreover, since both pump parts 3 and 6 exhibit the function of a pump, the whole space in both pump parts 3 and 6 is utilized in order to exhibit a pump function, and a waste of space is saved compared with a cylinder-piston type. In addition, the height and diameter of the pump dispenser 1 can be reduced, and compactness can be achieved.

Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the essence thereof.
For example, it is also possible to separate the foam aggregate by attaching a mesh part to the nozzle tip.

Naturally, modifications as shown in FIGS. 11 and 12 can also be employed.
FIG. 11 shows the pump dispenser 1 in which the injection preventing body V1 is inserted into the nozzle head portion and the virgin seal V2 is provided.
The cylindrical portion V1a of the injection preventing body V1 is press-fitted into the mouth portion of the nozzle head portion, and the base portion V1b can be grasped with a finger and pulled out.
Since the base V1b has non-slip irregularities, the finger does not slip.
The virgin seal V2 is integrated with the side surface of the cap 8 through a thin portion, and is cut off from the thin portion at the beginning of use.

FIG. 12 shows an improvement in the vicinity of the air A intake port of the air pump unit 6, and the roles of the third check valve and the stay 14 are performed at once by the air pump unit 6 itself.
A cylindrical air intrusion portion 6a, which is a part of the air pump portion 6 shown in FIG. 2, is formed into a bottomed shape, and a cut T is formed. The bottom portion 6a1 serves as a valve.
The cylindrical air intrusion portion 6a performs the function of passing air A in the direction of the lower arrow in FIG. 12 but not passing air A in the opposite direction, that is, the same function as the check valve structure.

FIG. 1 is an explanatory view showing an embodiment of a foam discharge pump dispenser of the present invention. FIG. 2 is an explanatory diagram showing an enlarged view of the vicinity of the second to fourth check valves in FIG. FIG. 3 is an explanatory view showing a state where the nozzle head of the pump dispenser of FIG. 1 is pushed down to a half depth. FIG. 4 is an explanatory diagram showing an enlarged view of the vicinity of the second to fourth check valves in FIG. FIG. 5 is an explanatory diagram showing an enlarged pump space of the air pump unit of FIG. FIG. 6 is an explanatory view showing a state where the nozzle head of the pump dispenser of FIG. 1 is pushed almost to the end. FIG. 7 is an explanatory view showing a state in which the nozzle head of the pump dispenser of FIG. FIG. 8 is an explanatory diagram showing an enlargement of the pump space of the air pump unit of FIG. FIG. 9 is an explanatory diagram showing a state when the nozzle head is pushed once and the nozzle head returns to the original position. FIG. 10 is an explanatory view showing a place where the mixed fluid is generated. FIG. 11 shows a modification of the pump dispenser provided with the injection preventing body and the virgin seal. FIG. 12 shows a modification in which an improvement is made near the air A inlet of the air pump unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foam discharge type pump dispenser 2 Container 3 Liquid pump part 4 First check valve 5 Second check valve 5a Vertical slit 6 Air pump part 6a Air intrusion part 6a1 Bottom part
7 Third check valve 8 Cap 8a Small tube portion 8a1 Valve seat portion 8b Annular groove portion 8c Hanging portion 8d Negative pressure release hole 9 Tube 10 Nozzle head 10a Main body portion 10a1 Guide groove 10a2 Locking projection 10b Nozzle head portion 11 Valve seat member 11a annular groove 12 mesh member 12a annular projection 12b mesh part 13 mesh sheet 14 stay 15 fourth check valve 15a cylinder part A air L liquid S1 introduction flow path S21, S22 pump space S3 discharge flow path T cut V1 injection prevention body V1a Cylindrical part V1b Base
V2 virgin seal

Claims (5)

In the foam discharge type pump dispenser for mixing the liquid contained in the container and the air outside the container,
Liquid pump means for sucking up the liquid contained in the container through the introduction flow path and discharging the liquid to the outside through the discharge flow path;
Air pump means for taking in air outside the container and sending the air into the discharge flow path;
Have
The liquid pump means includes
A liquid pump section that generates positive pressure and negative pressure by elastic deformation and restoring deformation;
A first check valve provided at a boundary between the introduction flow path and the pump space of the liquid pump unit;
A second check valve provided at a boundary between the pump space of the liquid pump unit and the discharge flow path;
Have
The air pump means includes
An air pump part that generates a positive pressure and a negative pressure in synchronization with the deformation of the liquid pump part; and a third check valve provided at an air inlet of the air pump part;
Have
A foam discharge pump dispenser comprising a fourth check valve so that a mixed fluid formed by mixing the liquid and the air does not enter the pump space of the air pump unit from the discharge flow path. The liquid pump part is axisymmetrically shaped,
When pressing the liquid pump part,
The foam discharge pump dispenser according to claim 1, wherein the liquid pump unit is elastically deformed while maintaining an axisymmetric shape. The air pump part has a substantially axisymmetric shape,
When pressing the air pump part,
The foam discharge pump dispenser according to claim 1, wherein the air pump part is elastically deformed while maintaining a substantially axisymmetric shape. The liquid pump part is axisymmetrically shaped,
The air pump part has a substantially axisymmetric shape,
The foam discharge pump dispenser according to claim 1, wherein the liquid pump unit and the air pump unit are disposed on a concentric shaft.   The liquid pump part and the cap attached to the container are fitted and fixed to each other, and when the liquid pump part is elastically deformed, a gap is formed in the fitting part between the liquid pump part and the cap. The foam discharge pump dispenser according to claim 1, wherein the pump space of the liquid pump unit and the space in the container communicate with each other.

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