JP2008189321A - Foaming container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foaming container in which a liquid and air are easily mixed even if the viscosity of the liquid is high. <P>SOLUTION: The foaming container includes a cylinder 24 for pressing a liquid and a cylinder 22 for compressing air, seats a liquid sucking valve 30 on a valve seat 24a at the bottom part of a first cylinder 24 by pushing down an up and down member 40 inserted into first and second cylinders to lowering a first piston 50 in the first cylinder and pressing the liquid in the first cylinder 24, and a second piston 60 in the second cylinder 22 falls to compress air and to send forwards the pressed liquid in the first cylinder 24 and the compressed air in the second cylinder 22 into a gas-liquid mixing chamber 46 to form bubbles and jets the bubbles. The bubble jetting container is provided with liquid back-flow means for making a part of the liquid in the first cylinder flow backward into a container body 1 by communicating between the inside of the first cylinder and the inside of the container body when the inside of the first cylinder 24 having the liquid sucking valve 30 seated is pressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a foam ejection container capable of ejecting foam by pressing down a pressing head.

There is known a foam ejection container in which a foam is ejected by mixing a liquid in the container and air by pushing down a pressing head (see Patent Document 1).
JP-A-8-230919

  However, in the foam ejection container described in Patent Document 1, when the viscosity of the liquid contained in the container body is high, there is a problem that it is difficult to mix with air and thus coarse foam is generated.

  An object of the present invention is to provide a foam ejection container in which liquid and air are easily mixed even when the viscosity of the liquid is high.

  Another object of the present invention is to provide a foam ejection container capable of reducing the molding cost.

The present invention has a foam jet pump including a first cylinder for pressurizing liquid and a second cylinder for air compression accommodated in a container body, and a vertically moving member inserted into the first and second cylinders. By pushing down, the first piston in the first cylinder descends and pressurizes the liquid in the first cylinder to seat the liquid suction valve in the first cylinder on the valve seat at the bottom of the first cylinder. When the second piston in the second cylinder descends and compresses the air, bubbles are formed by sending the pressurized liquid in the first cylinder and the compressed air in the second cylinder into the gas-liquid mixing chamber. In the foam ejection container
Provided is a liquid backflow means for allowing the inside of the first cylinder and the inside of the container to communicate with each other and backflowing a part of the liquid in the first cylinder into the container when pressurized in the first cylinder on which the liquid suction valve is seated. It is characterized by that.

  Further, according to the present invention, the liquid suction valve includes a rod-shaped valve body having a lower end portion formed from a cylindrical body having a lower surface opening, and the liquid backflow means includes a communicating portion formed in the cylindrical body. Features.

Furthermore, the present invention is characterized in that the communication portion is formed of a through hole 301 formed in the cylindrical body 31. Further, according to the present invention, the liquid backflow means includes a lowering lower limit of the first piston and liquid suction. It is comprised from the communicating part provided in the 1st cylinder part between the valve seats for valves.

  Furthermore, the present invention is characterized in that the communication part is formed of a through hole formed in a peripheral wall of the first cylinder.

  The communicating part is characterized by a groove part 302 formed in the valve seat 24a.

  In the present invention, when a liquid is pressurized and sent to the gas-liquid mixing chamber, a part of the liquid can be backflowed into the container, so that the mixing ratio of the liquid and air can be arbitrarily set. As a result, the generation of coarse bubbles can be suppressed, and therefore fine bubbles can be obtained.

  Further, the present invention can change the shape and size of the through-hole only by changing the jig for forming a through-hole of the mold by providing the liquid suction valve with a through-hole as a liquid backflow means. Therefore, the molding cost can be reduced and the shape of the through hole can be easily changed.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the foam ejection container to which the present invention is applied will be described.

  The foam ejection container includes a foam ejection pump 10 in the mouth and neck portion 2 of the container body 1. In the container body 1, for example, a foaming liquid such as a face washing liquid is accommodated.

  The foam jet pump 10 includes a cylinder member 20, a liquid suction valve 30, a stem 40, a first piston 50, a second piston 60, a liquid discharge valve 70, a pump head 100, and a foam unit 130. Tube 150.

  The cylinder member 20 has an annular flange portion 21 at the upper end, a cylindrical large-diameter cylinder portion (air cylinder) 22 having an inside as an air chamber extends downward from the flange portion 21, and a cylinder having an inside as a liquid chamber. A small-diameter cylinder part (liquid cylinder) 24 is concentrically lowered from the bottom plate part 23 of the large-diameter cylinder part 22 downward.

  This cylinder member 20 has a large-diameter cylinder portion 22 and a small-diameter cylinder portion 24 inserted into the container body 1 from the mouth-and-neck portion 2, and a flange portion 21 is placed on the packing disposed on the upper surface of the mouth-and-neck portion 2. Then, the container body 1 is fixed by a mounting cylinder 150 that is screwed into the mouth-and-neck portion 2.

  A suction pipe 201 is connected to the lower end of the cylinder member 20, and the lower end of the suction pipe 201 extends to the bottom of the container body 1.

  A central cylindrical portion 151 is erected on the inner periphery of the inward flange-like top wall on the top surface of the mounting cylinder 150, and the pump head 100 protrudes from the central cylindrical portion 151 so as to move up and down. A foam unit 130 is mounted inside the pump head 100, and a stem 40 that moves up and down in the cylinder member 20 is connected and fixed to the lower portion of the pump head 100.

  A liquid discharge valve 70 is provided inside the stem 40, and a second piston 60 that slides in an airtight manner on the inner peripheral surface of the large-diameter cylinder portion 22 is attached to the outer peripheral portion of the stem 40. An air intake valve 90 is attached to the second piston 60.

  A lower part of the stem 40 is connected to a first piston 50 that slides liquid-tightly on the inner peripheral surface of the small-diameter cylinder portion 24. A lower part of the first piston 50 is connected to the stem 40 and the first piston 50. A liquid suction valve 30 that operates to open and close the lower end of the cylinder member 20 is disposed.

  These will be described in further detail below. A rod-shaped liquid suction valve 30, a coil spring 39, and a first piston 50 are accommodated in the small diameter cylinder portion 24 of the cylinder member 20. The lower end portion of the liquid suction valve 30 is formed in a lower valve body 31 that can be seated on and separated from a valve seat 24 a formed of a tapered surface with a small diameter on the lower side formed at the lower end of the small diameter cylinder portion 24.

  In the liquid intake valve 30, a plurality of engaging pins 32 projecting outward are provided above the lower valve body 31, and the engaging pins 32 are provided at the lower end of the small diameter cylinder portion 24. It is fitted between the vertical ribs 26 so as to be movable up and down.

  Further, in the liquid suction valve 30, a portion above the engagement pin 32 is a large diameter portion 33, and a small diameter portion 34 is connected to the upper portion of the large diameter portion 33. Longitudinal grooves 33a and 34a extending in the vertical direction are formed on the outer peripheral surface of the large diameter portion 33 and the outer peripheral surface of the small diameter portion 34, respectively. The upper end portion of the small-diameter portion 34 is formed on a tapered tubular upper valve body 35 whose diameter is increased upward.

  The first piston 50 has a hollow cylindrical shape that is open at the top and bottom, and the lower part thereof is a seal part 51 that slides liquid-tightly on the inner peripheral surface of the small-diameter cylinder part 24. A seat 52 is formed.

  The upper valve body 35 of the liquid intake valve 30 protrudes upward from the upper opening of the first piston 50 and can be seated and separated from the valve seat 52 of the first piston 50, and opens and closes the upper opening of the first piston 50. .

  A small diameter portion 34 of the liquid suction valve 30 is inserted into the first piston 50 with a sufficient gap between the first piston 50 and the inner peripheral surface of the first piston 50. When descending, the large-diameter portion 33 of the liquid suction valve 30 is allowed to enter with a slight gap between the first piston 50 and the inner peripheral surface of the first piston 50. Secure.

  The coil spring 39 is provided between the upper end of the vertical rib 26 in the cylinder member 20 and the first piston 50, and urges the first piston 50 upward. The engagement pin 32 of the liquid suction valve 30 can be hooked to the lower end of the coil spring 39 from below, thereby restricting the upper limit when the liquid suction valve 30 moves upward.

  The stem 40 has a cylindrical shape with the top and bottom open, and can move up and down with respect to the large diameter cylinder portion 22 and the small diameter cylinder portion 24. The upper part of the first piston 50 is fitted to the lower part of the stem 40.

  An annular valve seat 41 is formed on the inner upper portion of the stem 40. A portion inside the stem 40 and above the valve seat 41 is formed in a gas-liquid mixing chamber 46, and a spherical liquid discharge valve 70 that can be seated on and separated from the valve seat 41 is provided in the chamber.

  A plurality of vertical ribs 42 extending in the vertical direction are provided at predetermined intervals in the circumferential direction between the upper surface of the upper valve body 35 and the lower end of the valve seat 41 on the inner surface of the stem 40. When the stem 40 is lowered by the pump head 100 being pushed down, the upper valve body 35 and the small diameter portion 34 of the liquid suction valve 30 can enter the inner surface of the vertical rib 42. The vertical groove 34a in the small diameter portion 34 of the liquid suction valve 30 serves as a liquid passage.

  The pump head 100 connected to the upper portion of the stem 40 includes an outer cylinder member 110 and an inner cylinder member 120. The inner cylindrical member 120 has a hollow cylindrical shape with an upper and lower opening, and an ejection hole 121b is formed in the upper end portion of the inner cylindrical member 120. The upper portion of the stem 40 is fitted on the inner surface of the lower portion of the inner cylindrical member 120.

  A plurality of vertical grooves 123a extending in the vertical direction are provided at predetermined intervals in the circumferential direction on the lower inner peripheral surface of the inner cylindrical member 120. The upper end of the vertical groove 123a extends slightly above the upper end of the stem 40, and the vertical groove 123a functions as an air flow path.

  A foam unit 130 is housed and fixed on the inner surface of the inner cylindrical member 120 in the vertical direction. The foam unit 130 is composed of a cylinder 131 and a pair of upper and lower foam elements 132 mounted therein. The cylinder is formed of a large-diameter cylinder part and a small-diameter cylinder part below the large-diameter cylinder part, and the small-diameter cylinder part is inserted into the stem 40 with a gap in the radial direction. A gap is also provided between the lower surface of the large-diameter cylindrical portion and the upper end of the stem 40, and these gaps function as an air flow path.

  A plurality of vertical grooves extending upward from the lower end surface are formed on the lower inner peripheral surface of the small-diameter cylindrical portion, and the flow path of liquid and air even when the liquid discharge valve 70 contacts the lower end of the small-diameter cylindrical portion. Can be secured.

  The outer cylindrical member 110 of the pump head 100 has a cylindrical wall portion 111 having a top shape, and a protruding portion 112 protruding sideways is provided on one side of the upper portion of the peripheral wall portion 111. The projecting portion 112 has a cylindrical shape that opens as a substantially rectangular jet port 113, and the jet port 113 communicates with the upper inside of the outer cylindrical member 110. The shape of the ejection port 113 is not limited to a rectangle, and may be a circle or an ellipse.

  An outward flange portion 43 is formed at an intermediate portion in the vertical direction of the outer surface of the stem 40, and an annular standing wall 44 projects upward on the upper surface of the flange portion 43. The inner peripheral surface of the upright wall 44 is formed as a tapered surface whose diameter increases upward.

  A second piston 60 is externally fitted to the stem 40 so as to move up and down within a small range between the flange portion 43 and the pump head 100. The second piston 60 has a hollow cylindrical shape with the top and bottom open, and the outermost part is formed in a seal cylinder part 61 that slides on the inner peripheral surface of the large-diameter cylinder part 22 of the cylinder member 20 in an airtight manner. Is formed in a base tube portion 62 that fits the stem 40, and the seal tube portion 61 and the base tube portion 62 are connected by a stepped tube portion 63 whose section is bent stepwise. A vent hole 22a is formed in the large-diameter cylinder portion 22 at a position corresponding to the second piston 60 before being lowered.

  The upper part of the base cylinder part 62 is press-contacted to the inner peripheral surface of the inner cylinder member 120 of the pump head 100 so as to be airtightly slidable. An air hole 64 is provided at a predetermined interval in the circumferential direction at a connecting portion between the base cylinder part 62 and the stepped cylinder part 63, and the air hole 64 is positioned relative to the pump head 100 and the second piston 60. Open and close by movement. That is, when the pump head 100 and the second piston 60 move up and down relatively, and the inner cylinder member 120 of the pump head 100 abuts the connecting portion between the base cylinder part 62 and the stepped cylinder part 63, the air hole 64 is When closed and the tubular valve body 125 is separated from the connecting portion, the air hole 64 is opened.

  The lower end of the base tube portion 62 comes into contact with and separates from the inner peripheral surface of the standing wall 44 of the stem 40 by the relative vertical movement of the stem 40 and the second piston 60. A plurality of vertical grooves 45 extending in the vertical direction are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the stem 40 where the base tube portion 62 is fitted. The vertical groove 45 communicates with the inside of the large-diameter cylinder portion 22 when the lower end of the base tube portion 62 is separated from the upright wall 44 of the stem 40, and has a large diameter when the lower end of the base tube portion 62 contacts the upright wall 44. It is cut off from the inside of the cylinder part 22.

  A second air intake valve 90 is fixed to the lower portion of the base cylinder portion 62. The second air intake valve 90 includes an upwardly tapered annular diaphragm 91 that spreads radially outward from its lower end. This diaphragm 91 has elasticity, and normally, the outer peripheral edge of the diaphragm 91 is pressed against and sealed against the lower surface of the stepped cylinder portion 63 of the second piston 60, and the negative pressure in the large diameter cylinder portion 22 is increased. The outer peripheral edge of the diaphragm 91 is pulled downward and operates so as to be separated from the stepped cylindrical portion 63.

  Next, the operation will be described. FIG. 1 shows a state before the pump head 100 is pushed down, and the pump head 100 is located at the upper limit. In a state before the pump head 100 is pushed down, the liquid suction valve 30 is pushed up by the coil spring 39 through the first piston 50, and the lower valve body 31 is separated from the valve seat 24a of the cylinder member 20, and has a small diameter. The inside of the cylinder portion 24 is in communication with the inside of the container body 1 through the suction pipe 201.

  The upper valve body 35 of the liquid intake valve 30 is seated on the valve seat 52 of the first piston 50 and closes the upper opening of the first piston 50. The lower end of the base cylinder part 62 of the second piston 60 abuts on the standing wall 44 of the stem 40, and the lower end of the inner cylinder member 120 of the pump head 100 is separated from the stepped cylinder part 63 of the second piston 60, and the air hole 64. Is open.

  When the pump head 100 is pushed down from this state, the stem 40 and the first piston 50 are lowered together with the pump head 100. As a result, the valve 52 of the first piston 50 and the upper valve of the liquid suction valve 30 are lowered. The body 35 is separated and the upper opening of the first piston 50 is opened. At the same time, the inside of the small diameter cylinder part 24 is pressurized by the lowering of the first piston 50, the liquid suction valve 30 is lowered by the liquid pressure in the small diameter cylinder part 24, and the lower valve body 31 is seated on the valve seat 24a. Thus, the lower end opening of the small diameter cylinder portion 24 is closed.

  On the other hand, the second piston 60 is stopped by the frictional force between the seal cylinder portion 61 and the large-diameter cylinder portion 22 immediately after the pump head 100 starts to be pushed down. The lower end of the base cylinder part 62 is separated from the upright projection 44 of the stem 40, and the lower end of the inner cylinder member 120 of the pump head 100 abuts on the stepped cylinder part 63 of the second piston 60 to close the air hole 64.

  After the lower end of the inner cylinder member 120 of the pump head 100 comes into contact with the stepped cylinder portion 63 of the second piston 60, the second piston 60 also descends integrally with the pump head 100, the stem 40, and the first piston 50. .

  Thereafter, when the pump head 100 is lowered, the liquid in the small-diameter cylinder portion 24 pressurized by the first piston 50 passes through the upper opening of the first piston 50 and the vertical grooves 33a and 34a of the liquid suction valve 30, and the stem. It passes between the 40 vertical ribs 42 and is pushed out above the upper valve body 35, and further pushes up the liquid discharge valve 70 with liquid pressure and flows into the gas-liquid mixing chamber 46.

  On the other hand, the air in the large-diameter cylinder portion 22 passes between the flange portion 43 and the standing projection 44 of the stem 40 and the lower end of the base cylinder portion 62 of the second piston 60, and passes through the vertical groove 45 of the stem 40. The gas flows into the gas-liquid mixing chamber 46 through the longitudinal groove 123a of the inner cylindrical member 120 of the pump head 100, and further through the passage between the large diameter cylindrical portion of the foaming unit 130 and the stem 40.

  In this way, the liquid and air are merged and mixed in the gas-liquid mixing chamber 46 and sent to the foaming unit 130. When passing through the foaming unit 130, the liquid foams and is pushed into the cylinder 115 of the pump head 100 in the form of bubbles. The bubbles are ejected from the ejection port 113 of the pump head 100 through the opening 115 a of the cylindrical portion 115 and the ejection hole 121 b in the small diameter portion 121.

  When the hand is released from the pump head 100, the hydraulic pressure in the small diameter cylinder portion 24 and the air pressure in the large diameter cylinder portion 22 decrease, the liquid discharge valve 70 is seated on the valve seat 41, and the elasticity of the coil spring 39 1 piston 50, stem 40, and pump head 100 are pushed upward.

  Here, the second piston 60 is stopped by the frictional force between the seal cylinder portion 61 and the large-diameter cylinder portion 22 immediately after the stem 40 starts to be pushed up, and as a result of the stem 40 rising in this state, the stem 40 is raised. The inner peripheral surface of the protrusion 44 is in pressure contact with the lower end of the base cylinder portion 62 of the second piston 60, thereby blocking between the inside of the large diameter cylinder portion 22 and the vertical groove 45 of the stem 40. At the same time, the lower end of the inner cylindrical member 120 of the pump head 100 is separated from the stepped cylindrical portion 63 of the second piston 60 to open the air hole 64.

  After the inner peripheral surface of the upright projection 44 hits the lower end of the base tube portion 62, the first piston 50, the stem 40, the second piston 60, and the pump head 100 rise together.

  When the first piston 50 is raised, the inside of the small diameter cylinder portion 24 becomes negative pressure, whereby the liquid suction valve 30 is pulled up, the lower valve body 31 is separated from the valve seat 24a, and the inside of the small diameter cylinder portion 24 is inside the container body 1. Communicate with. As a result, the liquid in the container body 1 is sucked into the small diameter cylinder portion 24 as the first piston 50 is raised.

  When the liquid is pumped up into the small diameter cylinder portion 24, the inside of the container body 1 becomes negative pressure, and as the second piston 60 rises, the inside of the large diameter cylinder portion 22 also becomes negative pressure. The diaphragm 91 of the two-air intake valve 90 is attracted downward, and is separated from the stepped cylindrical portion 63 of the second piston 60 to create a gap.

  As a result of the operation of the second air intake valve 90 in this manner, outside air enters the large-diameter cylinder portion 22 and the container body 1 through the vent hole 22a via the outer surface of the mouth and neck portion. As a result, the inside of the large-diameter cylinder portion 22 and the container body 1 become equal to the atmospheric pressure, the first piston 50 and the second piston 60 are smoothly raised, and the liquid is pumped up into the small-diameter cylinder portion 24. Is done smoothly.

  Next, the liquid backflow means 300 will be described. Before describing the liquid suction valve 30 further, the liquid suction valve 30 is composed of a large diameter portion 33, a small diameter portion 34, an upper valve body 35, and a lower valve body 31. Is as described above. Here, the lower valve body 31 will be described in detail.

  The lower valve body 31 is formed of a cylindrical body having an opening on the lower surface, and the lower portion of the cylindrical body is formed in a small outer diameter portion 37 via a tapered downward stepped portion 36, and the small outer diameter portion 37 is further formed. The outer surface of the lower end of the taper is formed as a tapered surface 38 that tapers downward, and the tapered surface 38 can be seated on a valve seat 24 a formed of a tapered surface formed at the lower end of the small diameter cylinder portion 24. . Reference numeral 38 a denotes an auxiliary rod that hangs down from the center of the lower surface of the large-diameter portion 33.

    The liquid backflow means 300 communicates the inside of the small diameter cylinder part and the inside of the container when the inside of the small diameter cylinder part 24 on which the liquid suction valve 30 is seated so that a part of the liquid in the small diameter cylinder part flows back into the container. In this embodiment, it is comprised from the through-hole 301 formed in the surrounding surface of the cylindrical body which forms the lower valve body 31. FIG.

  However, the liquid backflow means 300 is not limited to this. For example, the same effect can be obtained by forming the through holes 301 in the peripheral surface of the small diameter cylinder portion 24. However, the through hole is located between the lower limit of lowering of the first piston 50 and the lower end of the valve seat 24a of the small diameter cylinder portion 24. Alternatively, the same effect can be obtained by providing a vertical groove 302 on the lower surface of the lower valve body 31 or the valve seat 24a. However, a through hole 301 is provided in the lower valve body 31 for molding reasons. It is preferable.

    That is, when the through hole 301 is formed in the lower valve body 31 of the liquid suction valve 30, a jig insertion hole is formed in the mold, and the tip of the through hole forming jig is inserted into the metal from the insertion hole. This is because the resin can be filled into the mold after being inserted into the mold, and if it is desired to change the shape or size of the through hole, it can be handled by changing only the jig without changing the mold. .

  By providing the through hole 301 in this manner, when the pump head 100 is pushed down, the inside of the small diameter cylinder portion 24 is pressurized by the lowering of the first piston 50, and the liquid suction valve 30 is driven by the liquid pressure in the small diameter cylinder portion 24. The lower valve body 31 is seated on the valve seat 24a and closes the lower end opening of the small diameter cylinder portion 24, so that most of the liquid in the small diameter cylinder portion 24 is sent into the gas-liquid mixing chamber 46. However, a part is caused to flow back into the container body 1 through the through hole 301.

  By reversing a part of the pressurized liquid in this way, a ratio different from the normal gas-liquid mixing ratio in the gas-liquid mixing chamber 46 can be obtained, and this makes it easy to mix even high-viscosity liquid with air. be able to. The reverse flow rate of the pressurized liquid can be adjusted by appropriately selecting the size and shape of the through hole 301.

In the above description, a rod-shaped body is used as the liquid suction valve 30. However, the present invention is not limited to this, and for example, a ball valve can be used. In this case, the through-hole 301 is formed on the peripheral surface of the small diameter cylinder portion 24. Note that 400 is a guide tube and is fitted to the outer surface of the central tube portion 151. The guide tube 400 is the lower end of the outer tube member 110. A guide claw 401 provided in the guide has a guide groove that can move up and down.

It is side sectional drawing of the foam ejector which concerns on this invention. It is a top view of a pressing head. It is principal part sectional drawing. FIG. 4 is a diagram corresponding to FIG. 3 of a modified example. FIG. 6 is a view corresponding to FIG. 3 of a further modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container body 10 Bubble jet pump 22 2nd cylinder 24a Valve seat 30 Liquid suction valve 31 Cylindrical body 40 Vertical movement member 46 Gas-liquid mixing chamber 50 1st piston 60 2nd piston 301 Through-hole 302 Groove part

Claims (6)

A vertically moving member having a foam jet pump 10 including a first cylinder 24 for pressurizing liquid and a second cylinder 22 for compressing air housed in the container body 1 and inserted into the first and second cylinders When the first piston 50 in the first cylinder is lowered by the depression of 40 and the liquid in the first cylinder 24 is pressurized, the liquid intake valve 30 in the first cylinder is moved to the bottom of the first cylinder 24. While being seated on the valve seat 24a, the second piston 60 in the second cylinder 22 descends and compresses the air, whereby the pressurized liquid in the first cylinder 24 and the compressed air in the second cylinder 22 are removed. In the foam ejection container for forming and ejecting foam by sending it into the liquid mixing chamber 46,
When the pressure in the first cylinder 24 on which the liquid suction valve 30 is seated is pressurized, the liquid back flow causes the liquid in the first cylinder to flow back into the container body 1 by communicating the inside of the first cylinder and the container body. A foam ejection container characterized by comprising means. The liquid suction valve 30 is composed of a rod-shaped valve body formed from a cylindrical body 31 having a lower end opening at a lower end portion, and the liquid backflow means is composed of a communicating portion formed in the tubular body. Item 1. A foam ejection container according to Item 1. The bubble ejection container according to claim 2, wherein the communication portion includes a through hole 301 formed in the cylindrical body 31. The said liquid backflow means is comprised from the communicating part provided in the 1st cylinder 24 part between the descent | fall lower limit of the 1st piston 50, and the valve seat 24a for the liquid suction valves 30. The foam ejection container according to 1. The foam ejection container according to claim 4, wherein the communication portion includes a through hole 301 formed in a peripheral wall of the first cylinder 24. The foam ejection container according to claim 4, wherein the communication portion includes a groove portion 302 formed in the valve seat 24 a.

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