JP7438081B2 - Dispenser - Google Patents

Description

The present invention relates to a dispensing device.

Patent Document 1 discloses a discharge device configured such that when a push-down head is pressed down, the liquid contained in a container body is discharged from a discharge hole.

Japanese Patent Application Publication No. 11-276943

If the content liquid remains inside the push-down head (for example, inside the discharge hole, etc.) after the content liquid is ejected, the content liquid may solidify and become difficult to eject next time.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a dispensing device that can suppress solidification of the liquid inside the press-down head.

In order to solve the above problems, a discharge device according to one aspect of the present invention includes a pump having a stem that is vertically disposed at the mouth of a container body in which a content liquid is stored so as to be downwardly biased in an upwardly biased state; The pump includes a push-down head that is attached to the upper end of the stem and has a discharge hole for the liquid contained therein, and a mounting cap that attaches the pump to the mouth, and the pump moves up and down in conjunction with the stem. a liquid cylinder in which a piston is provided so as to be slidable up and down; an air cylinder in which an air piston that moves up and down in conjunction with the stem is provided in such a way as to be slidable up and down; and an upper valve body that blocks communication between the inside of the liquid cylinder and the discharge hole, and allows communication between the inside of the liquid cylinder and the discharge hole when the internal pressure of the liquid cylinder increases, An open recess is formed in a portion of the inner circumferential surface located below the liquid piston, and between the air piston and the stem, the inside of the air cylinder and the discharge hole are communicated. An air flow path is formed, and a communication hole is provided that communicates the inside of the liquid cylinder and the container body when the liquid piston reaches the open recess, and the air piston Even after the piston reaches the open recess, it can still descend relative to the air cylinder.

According to the above aspect, when the push-down head is pressed down, the liquid piston moves down inside the liquid cylinder, increasing the internal pressure of the liquid cylinder, pushing up the upper valve body, and discharging the inside of the liquid cylinder and the discharge. The holes communicate with each other, and the liquid content is discharged from the discharge hole. When the liquid piston reaches the opening recess, the inside of the liquid cylinder and the inside of the container body are communicated through the communication hole, so that the internal pressure of the liquid cylinder is released. As a result, the upper valve body cuts off communication between the inside of the stem and the discharge hole, and while the supply of the liquid content toward the discharge hole is stopped, the air in the air cylinder is directed from the air flow path toward the discharge hole. Supplied. Therefore, the content liquid remaining in the discharge hole etc. is pushed out by the pressure of the air supplied from inside the air cylinder, and it is possible to suppress the discharge hole etc. from being blocked due to the content liquid solidifying.

Here, the stem includes an intermediate member and an upper member, the intermediate member is inserted radially inside the air piston, the upper member has a mounting cylinder portion to which the push-down head is attached, and the upper valve The body may be provided within the stem, and the air flow path may be open to a portion of the inner surface of the mounting cylinder portion above the upper valve body.

In this case, the air flow path can be formed using, for example, a gap between the intermediate member and the air piston and a gap between the intermediate member and the upper member. Since the air passage opens above the upper valve body, air is supplied above the upper valve body while the upper valve body blocks communication between the inside of the stem and the discharge hole, and this air Content liquid remaining in the discharge hole etc. can be pushed out.

Moreover, the discharger of the above aspect may include an exhaust part that discharges the air in the air cylinder until the liquid piston reaches the open recess.

In this case, until the liquid piston reaches the open recess, air is discharged from the exhaust section, so that air in the air cylinder is prevented from being supplied to the discharge hole through the air flow path. Therefore, it is possible to suppress air from being mixed with the content liquid discharged from the discharge hole.

According to the above-mentioned aspect of the present invention, it is possible to provide a discharger capable of suppressing solidification of the content liquid within the push-down head.

FIG. 2 is a longitudinal cross-sectional view of the ejector according to the first embodiment. FIG. 2 is a longitudinal cross-sectional view showing a state in which the push-down head of FIG. 1 is pressed down. It is a longitudinal cross-sectional view of the discharge device concerning a 2nd embodiment. FIG. 5 is a longitudinal cross-sectional view showing a state in which the push-down head of FIG. 4 is pressed down.

(First embodiment)
Hereinafter, the ejector of the first embodiment will be described based on the drawings.
As shown in FIG. 1, the dispensing device 1A includes a pump 3 having a stem 4 which is erected from the mouth 2a of the container body 2 so as to be downwardly biased in an upwardly biased state, and a pump 3 which is attached to the upper end of the stem 4, and is attached to the upper end of the stem 4. It includes a push-down head 80 in which a liquid discharge hole 85a is formed, and a mounting cap 40 for mounting the pump 3 on the mouth portion 2a. The discharge device 1A and the container body 2 are also collectively referred to as a "discharge container." The container main body 2 is formed into a cylindrical shape with a bottom, and a liquid is accommodated inside.
The discharge device 1A is configured to discharge the liquid content through the stem 4 from the discharge hole 85a by pressing down the push-down head 80 to move the stem 4 downward and operating the pump 3.

(direction definition)
In this embodiment, the direction along the central axis O of the stem 4 is referred to as the up-down direction. In the vertical direction, the push-down head 80 side is referred to as the upper side, and the bottom side of the container body 2 is referred to as the lower side. In a plan view seen from above and below, the direction intersecting the central axis O is called the radial direction, and the direction going around the central axis O is called the circumferential direction.

The pump 3 includes a stem 4 , a cylinder member 10 , a lower valve member 30 , an air piston 50 , a push-down head 80 , and an upper valve member 90 . The stem 4 of this embodiment has a structure in which a lower member 20, an intermediate member 70, and an upper member 60 are combined. Note that the stem 4 may be composed of one component.

The cylinder member 10 includes a liquid cylinder 11, an enlarged diameter portion 12, an air cylinder 13, a flange portion 14, a lower cylinder portion 15, and a spring seat 17. The liquid cylinder 11 has a cylindrical shape extending in the vertical direction. A tapered portion 11c is formed at the lower end of the liquid cylinder 11, the inner diameter of which decreases as it goes downward. The liquid cylinder 11 is formed with a communication hole H and an open recess 11b. The communication hole H is formed at the upper end of the liquid cylinder 11 and at a portion located below the enlarged diameter portion 12 . The communication hole H is formed to penetrate the liquid cylinder 11 in the radial direction, and is open toward the inside of the container body 2. Note that the communication hole H may be formed in a portion of the cylinder member 10 other than the liquid cylinder 11.

The open recess 11b is formed on the inner circumferential surface of the liquid cylinder 11 and is recessed toward the outside in the radial direction. The open recessed portion 11b is formed below the communication hole H and above the tapered portion 11c at the lower end of the liquid cylinder 11. The open recess 11b extends all the way around the inner peripheral surface of the liquid cylinder 11 in the circumferential direction. However, the open recess 11b may be a plurality of vertical grooves (grooves extending in the vertical direction) formed at intervals in the circumferential direction.
The spring seat 17 is located below the open recess 11b and protrudes radially inward from the inner peripheral surface of the liquid cylinder 11.

The enlarged diameter portion 12 is formed at the upper end of the liquid cylinder 11. The inner diameter of the enlarged diameter portion 12 is larger than the inner diameter of the liquid cylinder 11. The air cylinder 13 has a cylindrical shape with a bottom and is located above the enlarged diameter portion 12 . An air piston 50 is provided within the air cylinder 13 so as to be slidable in the vertical direction. In this embodiment, the space surrounded by the air cylinder 13, the stem 4, and the air piston 50 is referred to as an "operating space S." As the air piston 50 slides in the vertical direction with respect to the air cylinder 13, the internal volume of the working space S changes.

The bottom wall of the air cylinder 13 is connected to the upper end of the enlarged diameter portion 12. The inner diameter of the air cylinder 13 is larger than the inner diameters of the liquid cylinder 11 and the enlarged diameter portion 12. A plurality of air holes 13a are formed in the air cylinder 13 at intervals in the circumferential direction. Note that the number of air holes 13a may be one. The flange portion 14 projects radially outward from a portion of the air cylinder 13 above the air hole 13a. An annular packing is sandwiched between the flange portion 14 and the mouth portion 2a.

The lower cylinder portion 15 projects downward from the liquid cylinder 11. A pipe 16 is inserted inside the lower cylinder part 15. The lower end of the pipe 16 is open near the bottom of the container body 2. When the inside of the liquid cylinder 11 becomes negative pressure, the content liquid sucked up from the opening at the lower end of the pipe 16 flows into the liquid cylinder 11.

The lower member 20 includes a liquid piston 21, a locking portion 22, a flange 23, and a seal cylinder portion 24. The liquid piston 21 has a cylindrical shape extending in the vertical direction, has elasticity at the lower end, and increases in diameter as it goes downward. The lower end of the liquid piston 21 is in liquid-tight contact with the inner circumferential surface of the liquid cylinder 11, and slides against the liquid cylinder 11 with a seal secured.

The liquid piston 21 is formed with an auxiliary seal protrusion 21a that protrudes radially outward. The auxiliary seal protrusion 21a is located above the lower end of the liquid piston 21 and is in liquid-tight contact with the inner peripheral surface of the liquid cylinder 11. When the push-down head 80 is not pushed down, the auxiliary seal protrusion 21a is located above the communication hole H. This prevents the liquid content of the container body 2 from flowing into the air cylinder 13 through the communication hole H.

The locking portion 22 projects radially inward from the inner circumferential surface of the liquid piston 21 . A compression spring 6 is in contact with the locking portion 22 from below. The compression spring 6 is disposed between the locking portion 22 and the spring seat 17 in a vertically compressed state. Thereby, the lower member 20 (stem 4) is urged upward.

The flange 23 is formed into an annular shape in a plan view, and protrudes radially outward from the upper end of the liquid piston 21. The outer diameter of the flange 23 is larger than the inner diameter of the enlarged diameter portion 12. When the lower member 20 is lowered by a predetermined amount, the flange 23 comes into contact with the upper end opening of the enlarged diameter portion 12, and further lowering of the lower member 20 is restricted (see FIG. 2). The seal cylindrical portion 24 is elastic and has a cylindrical shape that protrudes downward from the radially inner end of the flange 23 . The outer diameter of the seal cylinder portion 24 increases as it goes downward. When the lower member 20 descends by a predetermined amount, the seal cylinder portion 24 enters inside the enlarged diameter portion 12 and comes into airtight contact with the inner circumferential surface of the enlarged diameter portion 12. The enlarged diameter portion 12 and the seal cylinder portion 24 constitute a seal structure that blocks communication between the inside of the air cylinder 13 and the inside of the container body 2 through the communication hole H when the stem 4 is lowered by a predetermined amount.

The lower valve member 30 has a columnar shape extending in the vertical direction, and includes a lower valve body 31 and a seal portion 32. The lower valve body 31 is formed at the lower end of the lower valve member 30, and is seated on and separated from the tapered portion 11c of the liquid cylinder 11. When the lower valve body 31 is seated on the tapered portion 11c, communication between the container body 2 and the inside of the liquid cylinder 11 through the pipe 16 is cut off. When the lower valve body 31 separates from the tapered portion 11c, the shutoff is released and the container body 2 and the inside of the liquid cylinder 11 communicate again through the pipe 16.

The seal portion 32 is located at the upper end of the lower valve member 30 and is formed into a hollow inverted conical shape. The seal portion 32 is fitted inside the locking portion 22 of the lower member 20 so as to be able to be separated. When the seal portion 32 is fitted inside the locking portion 22, the flow of the liquid inside the liquid piston 21 is blocked, and when the seal portion 32 is separated from the locking portion 22, the blocking is released. The sealing portion 32 has a function of preventing leakage of the liquid content due to an increase in internal pressure of the container body 2 during distribution, storage, or when not in use, or due to overturning, inversion, or the like.

The intermediate member 70 is located between the lower member 20 and the upper member 60 and connects the lower member 20 and the upper member 60. The intermediate member 70 has an inner cylinder part 71, an intermediate cylinder part 72, an upper cylinder part 73, and a valve seat 74. The inner cylindrical portion 71 has a cylindrical shape extending in the vertical direction, and is fitted inside a portion of the lower member 20 above the locking portion 22 . The intermediate cylinder part 72 surrounds the inner cylinder part 71 from the outside in the radial direction. The upper end of the lower member 20 is sandwiched between the inner cylinder part 71 and the intermediate cylinder part 72. A protrusion 72a that protrudes radially outward is formed at the lower end of the intermediate cylindrical portion 72. The protrusion 72a is annular in plan view. The upper cylinder part 73 extends upward from the inner cylinder part 71 and the intermediate cylinder part 72. The valve seat 74 is a step formed inside the upper cylinder portion 73 and facing upward.

The upper member 60 has a mounting cylinder part 61, an annular projection 62, and an outer sliding cylinder part 63. The lower part of the mounting cylinder part 61 surrounds the upper cylinder part 73 of the intermediate member 70 from the outside in the radial direction. A plurality of vertical grooves are formed at intervals in the circumferential direction in a portion of the inner peripheral surface of the mounting cylinder part 61 that surrounds the upper cylinder part 73. These vertical grooves are part of an air flow path R that will be described later. The annular projection 62 is annular in plan view and protrudes radially outward from the lower end of the mounting cylinder portion 61 . The outer sliding cylinder part 63 extends downward from the mounting cylinder part 61.

The air piston 50 is attached to the radially outer side of the intermediate member 70 and is configured to move up and down together with the stem 4. The air piston 50 includes a mounting portion 51 , an annular portion 52 , a sliding portion 53 , and an inner sliding cylinder portion 54 . The attachment part 51 has a cylindrical shape extending in the vertical direction, and surrounds the intermediate cylinder part 72 from the outside in the radial direction. In other words, the intermediate member 70 is inserted inside the cylindrical attachment portion 51 . The air valve 5 is attached to the attachment part 51. The annular portion 52 protrudes radially outward from the upper end of the attachment portion 51, and is formed into an annular shape in a plan view. In the initial state (FIG. 1), a vertical gap is provided between the annular portion 52 and the outer sliding cylinder portion 63. Within this gap, the upper member 60 can be lowered relative to the air piston 50.

An air intake hole 52a is formed at the inner peripheral edge of the annular portion 52, passing through the annular portion 52 in the vertical direction. The air valve 5 includes an externally fitting cylinder part that is externally fitted onto the mounting part 51, and an air valve main body part that extends radially outward from the lower end of the externally fitting cylinder part. The air valve main body portion is elastically deformable in the vertical direction and closes the intake hole 52a from below. When the push-down head 80 is returned upward after being pressed down, the air valve body of the air valve 5 opens as the pressure in the working space S decreases, and outside air is supplied into the air cylinder 13 through the intake hole 52a. Ru.

The sliding portion 53 extends in the vertical direction from the radially outer end of the annular portion 52 . The sliding portion 53 is elastically deformable and is in airtight contact with the inner circumferential surface of the air cylinder 13. When the push-down head 80 is not pushed down, the air hole 13a of the air cylinder 13 is closed from the inside by the sliding portion 53. When the stem 4 moves up and down, the air piston 50 also moves up and down together with the stem 4. At this time, the sliding portion 53 slides against the inner circumferential surface of the air cylinder 13 while maintaining an airtight state. The inner sliding tube portion 54 extends upward from the annular portion 52. The inner diameter and outer diameter of the inner sliding cylinder portion 54 increase upwardly. A radial gap is provided between the air piston 50 and the intermediate member 70. This gap is part of an air flow path R that will be described later.

The mounting cap 40 has a mounting cylinder portion 41 extending in the vertical direction, and an annular top wall portion 42 extending radially inward from the upper end of the mounting cylinder portion 41. A female screw portion is formed on the inner circumferential surface of the mounting cylinder portion 41 and is screwed into a male screw portion formed at the mouth portion 2a of the container body 2. The pump 3 is fixed to the mounting cap 40 by fitting the flange portion 14 of the cylinder member 10 inside the female threaded portion of the mounting cylinder portion 41 . A lower end portion of the push-down head 80 is inserted into the inside of the top wall portion 42 . A circumferential wall of a cylindrical cap C is fitted into the upper part of the mounting cylinder portion 41 .

The push-down head 80 has an inner head cylinder 81, an outer head cylinder 82, and a nozzle cylinder 83. The head inner cylinder 81 and the head outer cylinder 82 have a cylindrical shape extending in the vertical direction, and the head outer cylinder 82 surrounds the head inner cylinder 81 from the outside in the radial direction. The head inner cylinder 81 is externally fitted onto the mounting cylinder part 61, and thereby the push-down head 80 is attached to the stem 4. The nozzle cylinder 83 projects radially outward from the head outer cylinder 82. The inside of the nozzle cylinder 83 and the inside of the head inner cylinder 81 communicate with each other.

A flow path forming member 84 and a nozzle tip 85 are provided inside the nozzle tube 83 . The nozzle tip 85 has a capped cylindrical shape and is fitted inside the opening at the tip of the nozzle tube 83 . In this embodiment, a discharge hole 85a is formed in the nozzle chip 85. However, for example, the nozzle tip 85 may not be provided and the opening of the nozzle tube 83 itself may correspond to the discharge hole. The flow path forming member 84 is a columnar member extending in the radial direction, and has a groove formed therein that serves as a flow path for the content liquid. Depending on the shape of the groove of the flow path forming member 84, the discharge pattern and force of the liquid content discharged from the discharge hole 85a change.

The upper valve member 90 has a columnar part 91, an elastic part 92, and an upper valve body 93. The columnar portion 91 extends along the vertical direction and is located inside the head inner cylinder 81. The elastic part 92 is connected to the lower end of the columnar part 91 and can be elastically deformed in the vertical direction. The upper valve body 93 is connected to the lower end of the elastic portion 92 and is urged downward by the elastic force of the elastic portion 92 . The upper valve body 93 is pressed against the valve seat 74 by this downward biasing force, and in this state, communication between the inside of the stem 4 and the inside of the head inner cylinder 81 is cut off. When the internal pressure of the stem 4 increases, the upper valve body 93 is pushed up against the urging force of the elastic part 92, and the inside of the stem 4 and the inside of the head inner cylinder 81 are communicated with each other.

Next, the operation of the ejector 1A configured as above will be explained. The following explanation assumes that the air cylinder 13 is filled with air and that the liquid cylinder 11 is filled with liquid by pressing down the push-down head 80 multiple times. .

As shown in FIG. 1, in the initial state (state where no external force is applied), the lower valve body 31 is separated from the tapered part 11c, the seal part 32 is seated on the locking part 22, and the upper valve body 93 is in the valve position. It is seated on a seat 74, and the seal cylinder portion 24 is spaced apart from the enlarged diameter portion 12. Further, the air hole 13a of the air cylinder 13 is closed by a sliding portion 53. Further, a vertical gap is provided between the outer sliding cylinder part 63 and the annular part 52. When the push-down head 80 is pressed down from this state, the stem 4 descends relative to the air piston 50 until the outer sliding cylinder portion 63 comes into contact with the annular portion 52 . At this time, the air piston 50 is prevented from descending due to the frictional resistance acting between the sliding portion 53 and the air cylinder 13. Therefore, a vertical gap is formed between the protrusion 72a of the intermediate member 70 and the mounting portion 51 of the air piston 50.

When the stem 4 is lowered by pressing down the push-down head 80 , the inner rib formed on the inner surface of the inner cylinder portion 71 of the intermediate member 70 comes into contact with the seal portion 32 . Due to the frictional resistance that acts between this inner surface rib and the seal portion 32, the lower valve member 30 also descends with respect to the cylinder member 10. As a result, the lower valve body 31 is seated on the tapered portion 11c, and the lower end of the liquid cylinder 11 is closed.

When the push-down head 80 is further pushed down, the outer sliding cylinder portion 63 comes into contact with the annular portion 52, so that the stem 4 and the air piston 50 are lowered together with respect to the cylinder member 10. At this time, although the internal volume of the working space S is reduced, the air in the working space S is released into the container body 2 through the communication hole H. Further, as the air piston 50 descends relative to the cylinder member 10, the air hole 13a is unblocked by the sliding portion 53, so that the air inside the container body 2 is released to the outside through the air hole 13a, etc. . Therefore, an increase in the internal pressure of the working space S and the container body 2 is suppressed.

When the stem 4 further descends, the locking part 22 separates downward from the seal part 32, and as the liquid piston 21 slides within the liquid cylinder 11, the internal pressure of the liquid cylinder 11 increases, The upper valve body 93 is pushed up against the downward biasing force of the elastic portion 92. Thereby, the content liquid flows into the push-down head 80 from the stem 4 and is discharged from the discharge hole 85a.

When the stem 4 further descends, as shown in FIG. 2, the seal cylinder portion 24 enters the enlarged diameter portion 12 and the liquid piston 21 reaches the open recess 11b. When the liquid piston 21 reaches the open recess 11b, the inside of the liquid cylinder 11 passes through the open recess 11b, the gap between the outer peripheral surface of the liquid piston 21 and the inner peripheral surface of the liquid cylinder 11, and the communication hole H. and the inside of the container body 2 communicate with each other. As a result, the pressure inside the liquid cylinder 11 decreases, and the upper valve body 93, which is urged downward by the elastic portion 92, is again seated on the valve seat 74, and the discharge of the content liquid from the discharge hole 85a is stopped. Further, as the seal cylinder portion 24 enters the enlarged diameter portion 12, communication between the working space S and the container body 2 through the communication hole H is cut off. When the push-down head 80 is further pushed down in this state, the seal cylinder portion 24 slides within the enlarged diameter portion 12 and the internal pressure of the working space S increases.

Here, in this embodiment, the vertical gap between the protrusion 72a and the attachment part 51, the radial gap between the air piston 50 and the intermediate member 70, and the inner circumferential surface of the attachment cylinder part 61. The formed vertical grooves are collectively referred to as an "air flow path R." This air flow path R allows the inside of the working space S and the inside of the push-down head 80 to communicate with each other. Then, as the internal pressure of the working space S increases, air flows into the push-down head 80 through the air flow path R and is discharged from the discharge hole 85a. Therefore, the liquid contents in the flow path of the flow path forming member 84 and the discharge hole 85a are pushed out by the air, and it is possible to prevent these liquid contents from solidifying and blocking the flow path.

As described above, the discharge device 1A of the present embodiment includes a pump 3 having a stem 4 which is vertically disposed in the mouth portion 2a of the container body 2 in which the liquid content is accommodated so as to be downwardly biased in an upwardly biased state, 4, a push-down head 80 having a discharge hole 85a for the liquid content, and a mounting cap 40 for mounting the pump 3 on the mouth portion 2a. a liquid cylinder 11 in which a liquid piston 21 is vertically slidable; and an air cylinder 13 in which an air piston 50 that moves vertically in conjunction with the stem 4 is vertically slidable. and an upper valve body 93 that blocks communication between the inside of the liquid cylinder 11 and the discharge hole 85a and allows communication between the inside of the liquid cylinder 11 and the discharge hole 85a when the internal pressure of the liquid cylinder 11 increases. An open recess 11b is formed in a portion of the inner peripheral surface of the liquid cylinder 11 located below the liquid piston 21, and an air cylinder 13 is formed between the air piston 50 and the stem 4. An air flow path R is formed to communicate between the inside and the discharge hole 85a, and a communication hole H is provided to communicate between the inside of the liquid cylinder 11 and the inside of the container body 2 when the liquid piston 21 reaches the open recess 11b. Thus, the air piston 50 can be lowered relative to the air cylinder 13 even after the liquid piston 21 reaches the open recess 11b.

According to this configuration, when the push-down head 80 is pressed down, the liquid piston 21 descends within the liquid cylinder 11, thereby increasing the internal pressure of the liquid cylinder 11, pushing up the upper valve body 93, and pushing the stem up. 4 and the discharge hole 85a communicate with each other, and the liquid content is discharged from the discharge hole 85a. When the liquid piston 21 reaches the opening recess 11b, the inside of the liquid cylinder 11 and the inside of the container body 2 communicate with each other through the communication hole H, so that the internal pressure of the liquid cylinder 11 is released. As a result, the upper valve body 93 blocks communication between the inside of the stem 4 and the discharge hole 85a, and the air is directed from the air flow path R toward the discharge hole 85a while the supply of the content liquid toward the discharge hole 85a is stopped. will be supplied. Therefore, the content liquid remaining in the discharge hole 85a etc. is pushed out by the pressure of the air supplied from inside the air cylinder 13, and it is possible to suppress the content liquid from solidifying and clogging the discharge hole 85a etc.

Further, the stem 4 includes an intermediate member 70 and an upper member 60, the intermediate member 70 is inserted inside the air piston 50 in the radial direction, and the upper member 60 has a mounting cylinder portion 61 to which the push-down head 80 is attached, The upper valve body 93 is provided within the stem 4, and the air flow path R opens at a portion above the upper valve body 93 on the inner surface of the mounting cylinder portion 61. According to this configuration, the air flow path R can be formed using, for example, the gap between the intermediate member 70 and the air piston 50 and the gap between the intermediate member 70 and the upper member 60. Since the air flow path R is open above the upper valve body 93, air is directed above the upper valve body 93 while the upper valve body 93 blocks communication between the inside of the stem 4 and the discharge hole 85a. The air can be used to push out the liquid remaining in the discharge holes 85a and the like.

Moreover, the communication hole H of this embodiment also functions as an exhaust part that exhausts the air in the air cylinder 13 until the liquid piston 21 reaches the open recess 11b. Therefore, until the liquid piston 21 reaches the open recess 11b, air is discharged from the exhaust part (communication hole H), and air in the air cylinder 13 is supplied to the discharge hole 85a through the air flow path R. things are suppressed. Therefore, it is possible to suppress air from being mixed with the liquid content discharged from the discharge hole 85a.

Note that structures other than the communication hole H may be employed as the exhaust section for discharging the air in the air cylinder 13 until the liquid piston 21 reaches the open recess 11b. For example, a recess may be formed in a portion of the circumferential wall of the air cylinder 13 in the vertical direction, and the air may be discharged while the sliding portion 53 of the air piston 50 is located in the recess. .

(Second embodiment)
Next, a second embodiment according to the present invention will be described, which has the same basic configuration as the first embodiment. Therefore, similar configurations will be given the same reference numerals and their explanations will be omitted, and only the different points will be explained.
As shown in FIG. 3, the ejector 1B of this embodiment differs from the first embodiment in the shapes of the cylinder member 10 and the lower member 20.

In the cylinder member 10 of this embodiment, the liquid cylinder 11 and the air cylinder 13 are connected by a connecting cylinder portion 18 having a bottomed cylindrical shape. The bottom wall of the connecting cylinder portion 18 is connected to the outer circumferential surface of the intermediate portion of the liquid cylinder 11 in the vertical direction, and a communication hole H is formed in this bottom wall. The bottom wall of the bottomed cylindrical air cylinder 13 is connected to an intermediate portion of the circumferential wall of the connecting cylinder portion 18 in the vertical direction. Further, the seal cylinder portion 24 is in sliding contact with the inner circumferential surface of the peripheral wall of the connection cylinder portion 18 . Note that the communication hole H may be formed in a portion of the cylinder member 10 other than the connecting tube portion 18.

In the vertical direction, the distance between the lower end of the liquid piston 21 and the open recess 11b is the same as the distance between the lower end of the sliding part 53 and the bottom wall of the air cylinder 13, and the connection with the lower end of the seal cylinder part 24. It is smaller than the distance between the cylinder part 18 and the bottom wall. Therefore, when the liquid piston 21 reaches the open recess 11b, there is still room for the stem 4 to further descend.

In this embodiment, when the push-down head 80 is pushed down, both the internal pressure of the liquid cylinder 11 and the internal pressure of the air cylinder 13 (operating space S) increase simultaneously. Therefore, the content liquid is supplied to the discharge hole 85a through the stem 4, and air is supplied to the discharge hole 85a through the air flow path R. Therefore, the content liquid and air are mixed and discharged from the discharge hole 85a. After that, when the liquid piston 21 reaches the opening recess 11b, the inside of the liquid cylinder 11 and the inside of the container body 2 are communicated through the communication hole H, and the internal pressure of the liquid cylinder 11 is released and the contents directed toward the discharge hole 85a are released. The liquid supply is stopped. After that, when the push-down head 80 is further pushed down, the supply of air to the discharge hole 85a through the air flow path R is continued. Therefore, the content liquid remaining in the discharge hole 85a etc. is pushed out, and it is possible to suppress the content liquid from solidifying.

Note that the technical scope of the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention.

For example, although the stem 4 of the first and second embodiments was composed of the lower member 20, the upper member 60, and the intermediate member 70, the stem 4 may include other members. Alternatively, a shape in which part or all of the lower member 20, the upper member 60, and the intermediate member 70 are integrated may be adopted.

In addition, the components in the above-described embodiments may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments and modifications may be combined as appropriate.

1A, 1B...Discharger 2...Container body 2a...Mouth 3...Pump 4...Stem 11...Liquid cylinder 11b...Opening recess 13...Air cylinder 21...Liquid piston 40...Mounting cap 50...Air piston 60... Upper member 61...Mounting cylinder part 70...Intermediate member
80...Press head 85a...Discharge hole 93...Upper valve body H...Communication hole R...Air flow path

Claims (3)

a pump having a stem that is vertically disposed at the mouth of a container body in which the liquid content is accommodated so as to be downwardly biased in an upwardly biased state;
a push-down head attached to the upper end of the stem and having a discharge hole for the liquid content;
an attachment cap for attaching the pump to the mouth;
The pump is
a liquid cylinder in which a liquid piston that moves up and down in conjunction with the stem is vertically slidable;
an air cylinder in which an air piston that moves up and down in conjunction with the stem is vertically slidable;
an upper valve body that blocks communication between the inside of the liquid cylinder and the discharge hole and allows communication between the inside of the liquid cylinder and the discharge hole when the internal pressure of the liquid cylinder increases;
An open recess is formed in a portion of the inner peripheral surface of the liquid cylinder located below the liquid piston,
An air flow path is formed between the air piston and the stem, which communicates the inside of the air cylinder with the discharge hole;
A communication hole is provided that allows communication between the inside of the liquid cylinder and the inside of the container body when the liquid piston reaches the open recess,
The air piston is capable of descending relative to the air cylinder even after the liquid piston reaches the open recess. the stem includes an intermediate member and an upper member;
the intermediate member is inserted radially inside the air piston;
The upper member has a mounting cylinder portion to which the push-down head is attached,
The upper valve body is provided within the stem,
The discharge device according to claim 1, wherein the air flow path opens at a portion of the inner surface of the mounting cylinder portion above the upper valve body. The discharge device according to claim 1 or 2, further comprising an exhaust section that exhausts air in the air cylinder until the liquid piston reaches the open recess.

Images