Liquid ejector

Abstract

To provide a liquid jet device capable of inhibiting leakage of a content fluid in a container body from leaking to the outside.SOLUTION: A liquid jet device 100 according to the disclosure includes: an attachment member 3 attached to a mouth part C2 of a container body C; a cylinder 1 having an upper cylinder 1h and a lower cylinder 1g and provided with an outdoor air introduction hole 1d; a plunger body 11 erected from the interior of the cylinder 1; a cylindrical stem 9 provided so as to be movable vertically relative to the cylinder 1; a sub cylinder 7 provided at a lower part of the stem 9; a valve member 13 which seals a gap between the cylinder 1 and the stem 9; and a head part 30 attached to an upper part of the stem 9 in a manner that enables the head part 30 to be pressed down. In the plunger body 11, a first piston 11d which may slide on an inner surface of the lower cylinder 1g and a second piston 11g which may slide on an inner surface of the sub cylinder 7 are formed. The sub cylinder 7 has an inner diameter larger than the lower cylinder 1g.SELECTED DRAWING: Figure 1A

Description

Technical Field

[0001] The present disclosure relates to a liquid ejector that is attached to the mouth of a container body and ejects the content liquid in the container body to the outside.

Background Art

[0002] As a conventional liquid ejector, for example, as shown in Patent Document 1, it includes a mounting cylinder portion attached to the mouth of a container body and a main cylinder hanging downward from this mounting cylinder portion. A spray body is formed with a first valve body inside the lower part of this main cylinder. An operating member is provided so as to be vertically movable with respect to the spray body, and a pressing head is attached to the upper part of a plunger body standing up from the inside of the main cylinder so as to be vertically movable. A sub-cylinder having a larger inner diameter than the main cylinder is provided below the pressing head, and a lower piston slidable inside the main cylinder is formed at the lower part of the plunger body, and an upper piston slidable inside the sub-cylinder is formed at the upper part of the plunger body. A first valve body is provided inside the lower part of the main cylinder, and a second valve body is provided between the upper end of the plunger body and the pressing head. And an outside air introduction hole for introducing outside air when a negative pressure is generated in the container body is provided on the side surface of the main cylinder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the liquid ejector of Patent Document 1, for example, when trying to discharge the content liquid with the container body in an inverted posture, there is a risk that the content liquid in the container body may flow back to the outside through the above-mentioned outside air introduction hole. Therefore, there is room for improvement in this regard.

[0005] The purpose of this disclosure is to provide a liquid dispenser that can prevent the liquid contents inside the container from leaking out. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the liquid ejector of this disclosure provides: [1] A mounting member that is attached to the mouth of the container body, A cylinder that hangs downward from the mounting member, comprising an upper cylinder and a lower cylinder connected to the lower end of the upper cylinder and having a smaller inner diameter than the upper cylinder, wherein the upper cylinder is provided with an air intake hole for introducing outside air into the container body, A plunger body is provided that is biased upward relative to the cylinder and is movable up and down, and stands upright from inside the cylinder, A cylindrical stem is provided so as to be vertically movable relative to the cylinder, A sub-cylinder is provided at the lower part of the stem and is movable vertically within the upper cylinder, A valve member that seals the gap between the cylinder and the stem, wherein the valve member is a check valve that allows outside air to be introduced into the container body through the outside air inlet and suppresses leakage of the contents from the container body through the outside air inlet, A head portion is attached to the upper part of the stem so as to be pressurizable and has a nozzle for dispensing the liquid contents. Equipped with, A first piston is formed at the lower part of the plunger body, which is capable of sliding along the inner surface of the lower cylinder, and a second piston is formed above the first piston, which is capable of sliding along the inner surface of the sub-cylinder. The sub-cylinder is characterized by having a larger inner diameter than the lower cylinder.

[0007] Furthermore, the liquid dispenser of this disclosure is [2] In the configuration described in [1] above, it is preferable that a gap is formed between the inner surface of the upper cylinder and the outer surface of the sub-cylinder.

[0008] Furthermore, the liquid dispenser of this disclosure is [3] In the configuration described in [1] or [2] above, it is preferable that the valve member is fixed by a modular member that fits into the cylinder. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a liquid dispenser that can suppress leakage of the liquid contents inside the container to the outside. [Brief explanation of the drawing]

[0010] [Figure 1A] This is a front half-view view of a liquid ejector, which is one embodiment of the present disclosure. [Figure 1B] This is an enlarged front cross-sectional view showing the area of ​​the valve member in Figure 1A. [Figure 1C] This is an enlarged front cross-sectional view showing the sub-cylinder region in Figure 1A. [Figure 2] This is a front cross-sectional view showing the state after removing the cover member from the state shown in Figure 1A, allowing the liquid contents to be ejected. [Figure 3] This is a front cross-sectional view showing the state after the pressing member has been pressed, from the state shown in Figure 2. [Modes for carrying out the invention]

[0011] Hereinafter, a liquid ejector 100 according to one embodiment of the present disclosure will be described in detail with reference to the drawings (Figures 1A to 3).

[0012] In Figure 1A, reference numeral 1 denotes a cylinder having a flange 2 positioned at the upper end of the mouth C2 of the container body C via a packing PK, and hanging downward from the mounting member 3 (described later) through the inside of the mouth C2 of the container body C. The cylinder 1 comprises a bottomed cylindrical cylinder body 1a, a pressure relief portion 1b whose inner surface expands radially outward at a height below the central height of the cylinder body 1a, a valve seat 1e having a frustoconical side shape that narrows downward and on which the intake valve 10 is seated, a fitting cylinder portion 1f for fitting and fixing a pipe P that guides the liquid contents of the container body C into the cylinder 1, and an outside air intake hole 1d and a pressure release hole 1c provided side by side at two locations on the top and bottom of the cylinder body 1a. The cylinder body 1a also comprises an upper cylinder 1h positioned at the top, and a lower cylinder 1g connected to the lower end of the upper cylinder 1h, on which the first piston 11d slides, and which has a smaller inner diameter than the upper cylinder 1h. The pressure relief sections 1b are formed at multiple locations in the circumferential direction and are provided to improve liquid cutoff at the nozzle when the ejection of the liquid contents ends by releasing the liquid pressure inside the cylinder 1 through the pressure relief sections 1b and pressure release holes 1c. Furthermore, by providing the pressure relief sections 1b, air inside the cylinder 1 can be recovered into the container body C during priming, enabling proper priming. In this embodiment, the outside air intake hole 1d is provided in the upper cylinder 1h and is provided to take in outside air into the container body C. That is, when the inside of the container body C becomes a negative pressure state, outside air is taken in through the outside air intake hole 1d.

[0013] In this specification, claims, and drawings, the vertical direction refers to the upward and downward directions when the liquid dispenser 100 is mounted on the container body C and in an upright position, as shown in Figure 1A. Furthermore, the radially outward direction refers to the direction away from the central axis O of the liquid dispenser 100 in Figure 1A, along a straight line passing through the central axis O and perpendicular to the central axis O, while the radially inward direction refers to the direction toward the central axis O along the said straight line.

[0014] In this embodiment, the container body C is formed by performing extrusion blow molding of a synthetic resin material. Also, a glass container or the like can be used for the container body C.

[0015] Reference numeral 3 denotes a mounting member having a cylindrical peripheral wall 3a and a top wall 5b that fixes the flange 2 between the mouth portion C2, and an inner peripheral wall 5 that stands up from the upper surface of the top wall 5b and an outer peripheral wall 5a are integrally provided on the outer side in the radial direction thereof. A fixing cylinder 4 that extends downward and presses the flange 2 from above is formed on the top wall 5b. The mounting member 3 has a screw portion 3S inside the peripheral wall 3a and is detachably mounted on the mouth portion C2 of the container body C. Instead of the screw portion 3S, an engaging protrusion protruding radially inward from the peripheral wall 3a may be provided and configured to be mounted on the container body C by caulking.

[0016] The head portion 30 of the liquid ejector 100 according to this embodiment includes a pressing member 8 and a nozzle tip 12, and by pressing the pressing member 8, the content liquid stored in the cylinder 1 is pumped to the head portion 30.

[0017] [[ID=十一年]] The pressing member 8 includes an outer peripheral wall 8d, an inner peripheral wall 8e provided on the inner side in the radial direction of the outer peripheral wall 8d to form a recess 8a and fitting to the inner surface of the stem 9, and a nozzle housing portion 8c that houses the nozzle tip 12 inside. The pressing member 8 partitions and forms a space C1 in the recess 8a, and the content liquid is pumped through the space C1.

[0018] Reference numeral 9 denotes a stem that is displaced downward together with the plunger body 11 by the downward pressure of the pressing member 8. The stem 9 moves vertically in response to repeated downward and upward movement of the pressing member 8, and a sub-cylinder 7 integrally provided at the lower part of the stem 9 moves inside the upper cylinder 1h. In addition, an outlet A2 is formed at the upper end of the plunger body 11. As will be described later, the downward movement of the stem 9 and the subsequent plunger body 11 due to the downward movement of the pressing member 8 increases the pressure inside the cylinder 1, and the second piston 11g of the plunger body 11 has a larger pressure-receiving area than the first piston 11d, and this difference in pressure-receiving area causes the plunger body 11 to move further downward relative to the stem 9. As a result, the discharge valve 15, which consists of the contact portion 9b of the stem 9 and the inclined portion 11b of the plunger body 11, opens, and the liquid contents pumped from inside the cylinder 1 are discharged to the outside via the discharge valve 15, the outlet A2, and the discharge hole 12a.

[0019] In this embodiment, the sub-cylinder 7 is integrally molded to the lower part of the stem 9, but the embodiment is not limited to this. The stem 9 and the sub-cylinder 7 may be molded separately and then assembled together.

[0020] The stem 9 is a cylindrical member positioned radially outward from the upper part of the plunger body 11 and is provided to be vertically movable, forming the aforementioned discharge valve 15 between itself and the plunger body 11. A contact portion 9b is provided on the inner circumferential surface of the lower end of the stem 9, and the contact portion 9b contacts an inclined portion 11b formed on the outer circumferential surface of the plunger body 11, thereby forming a discharge valve 15 that restricts the discharge of the liquid contents. The discharge valve 15 allows communication between the inside of the cylinder 1 and the nozzle due to the relative downward displacement of the plunger body 11 with respect to the stem 9.

[0021] On the inner circumferential surface of the stem 9 above the discharge valve 15, engaging ribs 9d are formed, which are intermittently arranged in the circumferential direction and project radially inward. The engaging ribs 9d engage with engaging projections 11a that project radially outward from the outer circumferential surface of the plunger body 11, thereby restricting excessive downward relative displacement of the plunger body 11 with respect to the stem 9.

[0022] The upper end of the stem 9 is fixed to the pressing member 8 by fitting the outer surface of the inner wall 8e of the pressing member 8 into its inner surface.

[0023] A sub-cylinder 7, which can move vertically within the upper cylinder 1h, is integrally formed with the lower part of the stem 9. As shown in Figures 1A and 1C, the sub-cylinder 7 comprises a cylindrical portion 7a, an upper wall 7c that closes the upper end of the cylindrical portion 7a and is connected to the lower part of the stem 9, and an annular pressing portion 7c1 that protrudes upward from the radially outer edge of the upper wall 7c and clamps the valve member 13 (described later) between itself and the module member 6. A contact portion 9b constituting the discharge valve 15 is provided in the region where the lower end of the stem 9 and the upper wall 7c are connected. As shown in Figure 1C, vertical ribs 7a1 extending vertically are intermittently provided on the outer circumferential surface of the cylindrical portion 7a. In this embodiment, a small gap is provided between the outer surface of these vertical ribs 7a1 and the inner surface of the upper cylinder 1h. This configuration reduces the surface area of ​​the cylindrical portion 7a facing the upper cylinder 1h, and also provides a radial gap between it and the upper cylinder 1h. This reduces the sliding resistance between the sub-cylinder 7 and the cylinder 1 when the pressing member 8 is pressed down and the stem 9 is displaced downward. Alternatively, the outer surface of the vertical rib 7a1 may slide against the inner surface of the upper cylinder 1h.

[0024] As shown in Figure 1A, the plunger body 11 is a member that extends vertically within the cylinder 1 and comprises a cylindrical portion 11j at its upper end and a columnar portion 11h connected to the lower end of the cylindrical portion 11j. The upper end of the cylindrical portion 11j is provided with an engaging projection 11a that engages with the engaging rib 9d of the stem 9 to form a pair of engaging portions 17. Below the engaging projection 11a, a communication hole 11e is provided that connects the inside and outside of the cylindrical portion 11j. Below the communication hole 11e, an inclined portion 11b is provided that slopes radially outward toward downward and forms the valve seat of the discharge valve 15.

[0025] A columnar portion 11h is integrally formed at the lower end of the cylindrical portion 11j, hanging downward. A piston cylinder 11k is provided on the radially outer side of the columnar portion 11h. A second piston 11g is provided at the upper end of the piston cylinder 11k, and a first piston 11d is provided at the lower end of the piston cylinder 11k. The columnar portion 11h and the piston cylinder 11k are connected at their respective upper parts, and a second communication hole 11f is intermittently provided circumferentially at this connection point, connecting the inside and outside of the piston cylinder 11k. The plunger body 11 is biased upward by a spring S relative to the cylinder 1 and is provided to be vertically movable, standing upright from inside the cylinder 1.

[0026] In this embodiment, the engaging portion 17 is configured with engaging ribs 9d and engaging projections 11a on both the stem 9 and the plunger body 11, but the embodiment is not limited to this configuration. It is sufficient that the relative downward displacement of the plunger body 11 with respect to the stem 9 is restricted, and the projections may be provided on only one of the stem 9 or the plunger body 11.

[0027] Furthermore, the space between the columnar portion 11h and the piston cylinder 11k in the plunger body 11 and the space inside the stem 9 function as a liquid flow path L through which the pressurized liquid contents pass. The liquid flow path L is a flow path that goes from the compression space PS at the bottom of the cylinder 1, through the space between the columnar portion 11h and the piston cylinder 11k and the second communication hole 11f, through the discharge valve 15, and then through the communication hole 11e and the inside of the stem 9 to the discharge port A2 and the space C1 of the pressing member 8. As will be described later, the liquid contents in the compression space PS of the compressed cylinder 1 are pressurized upward and sent to the discharge port 12a through this liquid flow path L.

[0028] A second piston 11g is provided at the upper part of the piston cylinder 11k of the plunger body 11, which slides against the inner surface of the sub-cylinder 7. A first piston 11d is provided at the lower part of the piston cylinder 11k, which slides against the inner surface of the lower cylinder 1g of the cylinder 1. In this embodiment, the first piston 11d and the second piston 11g are integrally formed.

[0029] In this embodiment, as shown in Figure 1A, the inner diameter of the sub-cylinder 7 is formed to be larger than the inner diameter of the lower cylinder 1g. With this configuration, when the pressure inside the cylinder 1 increases due to the pressing of the pressing member 8, the pressure-receiving area of ​​the second piston 11g is larger than the pressure-receiving area of ​​the first piston 11d, so the plunger body 11 moves downward due to the downward pressure received by the second piston 11g.

[0030] Furthermore, the space above the second piston 11g and the space below the first piston 11d are connected by a second communication hole 11f, as shown in Figure 1A. This ensures that the pressure inside the cylinder 1 is maintained at approximately the same level, and the compressed liquid inside the cylinder 1 is discharged from the discharge hole 12a via the aforementioned liquid flow path L.

[0031] Reference numeral 13 denotes a valve member that functions as a check valve to suppress leakage of the contents from inside the container body C through the outside air intake hole 1d. The valve member 13 comprises a valve body 13a that abuts against the outer circumferential surface of the stem 9 and can be opened by elastically deforming downward from a state in contact with the cylindrical wall portion 6a of the module member 6 shown in Figure 1A, an annular wall 13b erected upward from the radially outer end of the valve body 13a, and a valve flange 13c that further extends radially outward from the upper end of the annular wall 13b (see Figure 1B).

[0032] As shown in Figure 1B, the valve member 13 is fixed to the cylinder 1 by the annular wall 13b being sandwiched between the cylinder 1 and the valve fixing ring 6d of the module member 6 (described later), and the valve flange 13c being sandwiched between the flange 2 and the valve fixing flange 6b.

[0033] As shown in Figure 1B, the module member 6 comprises a cylindrical wall portion 6a surrounding the stem 9 from the radially outer side, a valve fixing flange 6b extending radially outward from below the central height of the cylindrical wall portion 6a, a fitting peripheral wall 6c hanging downward from the radially outer end of the valve fixing flange 6b, and a valve fixing ring 6d hanging downward from the valve fixing flange 6b at a radial position between the cylindrical wall portion 6a and the fitting peripheral wall 6c. As shown in Figure 1B, the module member 6 is fixed to the flange 2, i.e., the cylinder 1, with the valve fixing flange 6b sandwiching the valve member 13 between itself and the flange 2, by an undercut engagement between the fitting peripheral wall 6c and the inner surface of a fitting cylindrical portion 2a erected on the flange 2.

[0034] As shown in Figure 1B, the valve member 13 has its radially outer end of the valve body 13a sandwiched between the annular pressing portion 7c1 and the valve fixing ring 6d, while the radially inner end of the valve body 13a, although in contact with the stem 9, is able to be displaced downward from its initial state of contacting the lower end of the cylindrical wall portion 6a. With this configuration, when negative pressure is generated inside the container body C, the area below the valve member 13 also becomes negative pressure through the space between the outside air intake hole 1d and the longitudinal rib 7a1, causing the radially inner end of the valve body 13a to displace downward and create a gap between it and the stem 9, thereby allowing outside air to be introduced into the container body C from the outside through the outside air intake hole 1d.

[0035] On the other hand, if the contents are discharged in an inverted position using a forward / inverted adapter or the like, as in the prior art (Japanese Patent Publication No. 2022-27265), there is a possibility that the contents of the container body C may leak to the outside through the outside air intake hole 1d. However, in this embodiment, as described above, the valve member 13 that seals the inside of the container body C to the outside is fixed to the cylinder 1 by the module member 6. With this configuration, when the contents are discharged by pressing the pressing member 8 with the container body C in an inverted position, the valve body 13a contacts the outer surface of the stem 9 to seal the inside of the container body C to the outside, and also contacts the lower end of the cylindrical wall 6a. As the valve member 13 operates in this manner, the inside of the container body C is sealed to the outside, thereby suppressing leakage of the contents of the container body C to the outside through the outside air intake hole 1d.

[0036] Reference numeral 10 denotes an intake valve that opens and closes the intake port A1 formed at the lower end of the cylinder 1 in response to the vertical movement of the stem 9. In this embodiment, the intake valve 10 is configured as a ball valve.

[0037] The plunger body 11 is biased upward relative to the cylinder 1 by a spring S. The plunger body 11 is also movable up and down relative to the cylinder 1. By pressing the pressing member 8 of the head portion 30 attached above the plunger body 11, the stem 9 and the plunger body 11 move downward, and then the plunger body 11 moves downward due to the difference in the pressure-receiving area between the first piston 11d and the second piston 11g. When the plunger body 11 moves downward, it compresses the space below the first piston 11d in the cylinder 1 (compression space PS), increasing the pressure inside the cylinder 1.

[0038] A nozzle tip 12 (nozzle) is fitted onto the pressing member 8. The nozzle tip 12 has a discharge hole 12a formed therein for ejecting the liquid contents. This discharge hole 12a consists of a large diameter section and a small diameter section, which increases the flow velocity of the pressurized liquid contents and allows them to be ejected to the outside.

[0039] In this embodiment, as shown in Figure 1A, the liquid dispenser 100 is equipped with a cover member 50 that surrounds the head portion 30 from above and radially outward. The cover member 50 is equipped with a cylindrical peripheral wall 51 and a top wall 53 that closes the upper end of the peripheral wall 51, and is formed in a top-cylindrical shape. The cover member 50 is detachably attached to the mounting member 3 by fitting an engaging projection 5a1 provided on the outer surface of the outer peripheral wall 5a of the mounting member 3 into the inner surface of the lower end of the peripheral wall 51.

[0040] The components of the liquid dispenser 100 can be made from, for example, synthetic resin or metal.

[0041] In the liquid dispenser 100 having the configuration shown in Figure 1A, when a user uses the liquid contents, they first grasp the body of the container C with one hand and grasp the peripheral wall 51 of the cover member 50 with the other hand and pull the cover member 50 upward. This exposes the head portion 30 as shown in Figure 2, making it possible to dispense the liquid contents.

[0042] Next, the user pushes down the pressing member 8 of the head portion 30 with the cover member 50 shown in Figure 2 removed. When the pressing member 8 is pushed down, the upper end of the stem 9, into which the inner circumferential wall 8e of the pressing member 8 is fitted, is pushed down, and the plunger body 11 is also pushed down, increasing the pressure in the compression space PS of the cylinder 1. Then, due to the difference in the pressure-receiving area of ​​the first piston 11d and the second piston 11g, the difference in the downward pressing force acting on the plunger body 11 and the difference in the upward pressing force causes the plunger body 11 to move further downward relative to the stem 9, and the discharge valve 15, consisting of the contact portion 9b and the inclined portion 11b, opens. In other words, the inner diameter of the sub-cylinder 7 is formed to be larger than the inner diameter of the lower cylinder 1g. In this configuration, when the pressure inside cylinder 1 increases, the pressure-receiving area of ​​the second piston 11g is larger than the pressure-receiving area of ​​the first piston 11d due to the downward pressure. As a result, the plunger body 11 moves downward due to the downward pressure on the second piston 11g. This compresses the space below the first piston 11d (compression space PS), increasing the pressure inside cylinder 1. The liquid inside cylinder 1 then passes through the liquid flow path L, including the second communication hole 11f, the discharge valve 15, and the communication hole 11e, and is discharged from the discharge hole 12a.

[0043] If the user further presses the pressing member 8, the discharge valve 15 remains open and the plunger body 11 continues to descend relative to the stem 9. Eventually, the engaging projection 11a on the plunger body 11 contacts and engages with the engaging rib 9d on the stem 9 (see Figure 3). This restricts further downward relative movement of the plunger body 11 relative to the stem 9. Therefore, even if a downward pressing force is applied to the plunger body 11 by pressing the pressing member 8, the engaging projection 11a and the engaging rib 9d engage as shown in Figure 3, preventing the plunger body 11 from being displaced excessively downward. As a result, even when the pressing member 8 is pressed down forcefully, the inconvenience of the plunger body 11 reaching the pressure relief section 1b earlier and the discharge volume being greatly reduced compared to when it is pressed down at a normal speed can be suppressed.

[0044] When the pressing member 8 is pushed down to the lower limit of its movable range, the first piston 11d of the plunger body 11 reaches a position where it covers the pressure relief portion 1b of the cylinder 1. As a result, the hydraulic pressure inside the cylinder 1 is released through the pressure relief portion 1b and the pressure release hole 1c. With the release of the hydraulic pressure inside the cylinder 1, the downward pushing force acting on the plunger body 11 is also released, and the plunger body 11 is displaced upward by the biasing force of the spring S, causing the contact portion 9b to seat on the inclined portion 11b and the discharge valve 15 to close. As a result, the ejection of the liquid contents from the discharge hole 12a of the nozzle tip 12 is stopped. In addition, because the hydraulic pressure inside the cylinder 1 is rapidly released, the ejection of the liquid contents can be stopped cleanly.

[0045] When the user finishes using the liquid contents and stops pressing the pressing member 8, the plunger body 11, which had been displaced downwards within the cylinder 1, is biased upwards by the restoring force of the spring S and rises to the position shown in Figure 2. As the plunger body 11 rises, the volume inside the cylinder 1 increases, creating negative pressure. The suction valve 10, which was seated on the valve seat 1e, rises and opens, and the liquid contents from the container body C are introduced into the cylinder 1 via the suction port A1 from the pipe P. This introduced liquid contents are pressurized within the compression space PS of the cylinder 1 by the next pressing of the pressing member 8, and are discharged from the discharge port 12a via the liquid flow path L, including the second communication hole 11f, the discharge valve 15, and the communication hole 11e.

[0046] As the liquid contents of the container body C are introduced into the cylinder 1 through the pipe P, the inside of the container body C becomes negatively pressurized. As described above, the area below the valve member 13 also becomes negatively pressurized through the space between the outside air intake hole 1d and the vertical rib 7a1. This negative pressure causes the radially inner end of the valve body 13a to be displaced downward, creating a gap between it and the stem 9. As a result, the valve opens, and outside air is introduced into the container body C through the space between the valve member 13 and the vertical rib 7a1, and through the outside air intake hole 1d.

[0047] As described above, this embodiment includes a mounting member 3 attached to the mouth C2 of the container body C, a cylinder 1 hanging downward from the mounting member 3, having an upper cylinder 1h and a lower cylinder 1g connected to the lower end of the upper cylinder 1h and having a smaller inner diameter than the upper cylinder 1h, the upper cylinder 1h being provided with an outside air intake hole 1d for introducing outside air into the container body C, a plunger body 11 biased upward relative to the cylinder 1 and provided to be vertically movable and standing upright from inside the cylinder 1, a cylindrical stem 9 provided to be vertically movable relative to the cylinder 1, a sub-cylinder 7 integrally provided at the lower part of the stem 9 and movable vertically within the upper cylinder 1h, and The container body 11 includes a valve member 13 that seals the gap between the plunger 1 and the stem 9, and the valve member 13 is a check valve that allows outside air to be introduced into the container body C through the outside air inlet hole 1d and suppresses leakage of the contents from the container body C through the outside air inlet hole 1d, and a head portion 30 that is pushable to the upper part of the stem 9 and has a nozzle (nozzle tip 12) for discharging the contents, and a first piston 11d that can slide on the inner surface of the lower cylinder 1g is formed at the lower part of the plunger body 11, and a second piston 11g that can slide on the inner surface of the sub-cylinder 7 is formed above the first piston 11d, and the sub-cylinder 7 is configured to have a larger inner diameter than the lower cylinder 1g. With this configuration, when negative pressure is generated inside the container body C, the area below the valve member 13 also becomes negative pressure through the outside air inlet hole 1d and the valve opens, so that outside air can be introduced into the inside of the container body C from the outside through the outside air inlet hole 1d. Furthermore, since the valve member 13 functions as a check valve, it can prevent the liquid contents inside the container body C from leaking out to the outside.

[0048] Furthermore, in this embodiment, a gap is formed between the inner surface of the upper cylinder 1h and the outer surface of the sub-cylinder 7. By adopting this configuration, when the pressing member 8 is pressed downward, the sub-cylinder 7, which is integrally formed with the stem 9, does not slide against the inner surface of the cylinder 1, thereby reducing sliding resistance. Consequently, it is possible to avoid making the pressing operation heavy.

[0049] Furthermore, in this embodiment, the valve member 13 is configured to be fixed by a module member 6 that fits into the cylinder 1. By adopting this configuration, the module member 6 can prevent the valve member 13 from detaching from the cylinder 1, thus enabling the modularization of the pump mechanism. Consequently, modularizing the pump mechanism makes it easier to accommodate multiple external designs, and also allows for variations with different discharge volumes without increasing the burden on the equipment.

[0050] Furthermore, in this embodiment, the outer surface of the sub-cylinder 7 is configured to have vertical ribs 7a1 extending vertically intermittently in the circumferential direction. By adopting this configuration, even if the sub-cylinder 7 and the inner surface of the cylinder 1 slide against each other, the contact area between the two can be reduced, and a complete seal between the sub-cylinder 7 and the inner surface of the cylinder 1 can be avoided. In this way, by reducing the contact area of ​​the large-diameter sliding part, sliding resistance can be reduced, and the pressing operation can be avoided when pressing down the pressing member 8.

[0051] The above-described embodiment represents only one form of the present disclosure, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, the liquid dispenser 100 is pre-assembled into a unit, but according to the present disclosure, individual parts can be assembled to the container body C without pre-assembling them into a unit.

[0052] Furthermore, in this embodiment, the first piston 11d and the second piston 11g are configured to be integrally formed, but the invention is not limited to this embodiment, and the first piston 11d and the second piston 11g may be configured to be included in separate parts.

[0053] Furthermore, in this embodiment, only the engaging ribs 9d constituting the engaging portion 17 are provided intermittently in the circumferential direction. However, the embodiment is not limited to this configuration, and both the engaging projection 11a and the engaging ribs 9d may be provided intermittently in the circumferential direction. Alternatively, only the engaging projection 11a may be provided intermittently in the circumferential direction. [Industrial applicability]

[0054] This disclosure can be used, for example, as a liquid dispenser 100 in the fields of cosmetics such as lotions and hair styling products, pharmaceuticals such as insect repellents, and beauty and health products. [Explanation of Symbols]

[0055] 1 cylinder 1a Cylinder body 1b Pressure relief section 1c Pressure release hole 1d Outside air intake vent 1e Valve seat 1f Fitting cylinder section 1g lower cylinder 1h Upper cylinder 2 flanges 2a Fitting cylinder part 3 Mounting Member 3a Peripheral wall 3S threaded section 4 Fixed barrel 5 Inner wall 5a Outer wall 5a1 Engagement protrusion 5b Ceiling wall 6 Module components 6a Cylinder wall 6b Valve fixing flange 6c Mating peripheral wall 6d Valve retaining ring 7 Subcylinder 7a Cylindrical part 7a1 Longitudinal ribs 7c upper wall 7c1 Annular pressing part 8 Pressing member 8a recess 8c Nozzle housing 8d outer wall 8e Inner wall 9 Stem 9b Contact part 9d Engaging Rib 10 Intake valve 11 Plunger Body 11a Engagement protrusion 11b Inclined part (valve seat) 11d First piston 11e Communication hole 11f 2nd communication hole 11g 2nd piston 11h Column part 11j cylindrical part 11k piston cylinder 12 Nozzle Tips (Nozzles) 12a Discharge hole 13 Valve member 13a Valve body 13b Ring Wall 13c valve flange 15. Discharge valve 17 Engaging part 30 Head section 40 Plunger Body 50 Cover component 51 Peripheral wall 53. Top Wall 100 liquid squirt A1 Inlet A2 outlet C Container body C1 space C2 Mouth L Liquid channel O center axis P Pipe PK packing PS Compressed Space S Spring

Claims

1. A mounting member that is attached to the mouth of the container body, A cylinder that hangs downward from the mounting member, comprising an upper cylinder and a lower cylinder connected to the lower end of the upper cylinder and having a smaller inner diameter than the upper cylinder, wherein the upper cylinder is provided with an air intake hole for introducing outside air into the container body, A plunger body is provided that is biased upward relative to the cylinder and is capable of moving up and down, and stands upright from inside the cylinder, A cylindrical stem is provided so as to be able to move up and down relative to the cylinder, A sub-cylinder is provided at the lower part of the stem and is movable vertically within the upper cylinder, A valve member that seals the gap between the cylinder and the stem, wherein the valve member is a check valve that allows outside air to be introduced into the container body through the outside air inlet and suppresses leakage of the contents from the container body through the outside air inlet, A head portion is attached to the upper part of the stem so as to be pressurizable and has a nozzle for dispensing the liquid contents. Equipped with, A first piston is formed at the lower part of the plunger body, which is capable of sliding along the inner surface of the lower cylinder, and a second piston is formed above the first piston, which is capable of sliding along the inner surface of the sub-cylinder. The sub-cylinder is a liquid dispenser having a larger inner diameter than the lower cylinder.

2. The liquid ejector according to claim 1, wherein a gap is formed between the inner surface of the upper cylinder and the outer surface of the sub-cylinder.

3. The liquid ejector according to claim 1 or 2, wherein the valve member is fixed by a module member that fits into the cylinder.

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