JPH0698987B2 - Dispenser - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dispenser for discharging a liquid (liquid) contained in a container to the outside.

[Prior Art and Problems to be Solved] In general, a dispenser is widely known in which a liquid contained in a container is discharged to the outside by pressing down a head. In this type of dispenser, the liquid that is temporarily stored in the cylinder is discharged to the outside by closing the primary valve and opening the secondary valve when the head is pushed down, and the head is pushed up. Thus, the fluid contained in the container is sucked into the cylinder by opening the primary valve and closing the secondary valve.

By the way, in such a dispenser, the secondary valve may be configured as follows. That is, a cylindrical piston that slides on the outer peripheral surface with respect to the inner peripheral surface of the cylinder is provided so as to be vertically movable. This piston has a second valve seat at its lower end. A stem having a second valve body that cooperates with the second valve seat to form a secondary valve is provided. This stem is always biased upward by a biasing member. The upper end of this stem is press-fitted into the piston shaft. When the secondary valve is closed, there is a gap between the lower end of the piston shaft and the upper end of the piston (16 in the drawing). On the other hand, when the secondary valve is opened, the lower end of the piston shaft is in contact with the upper end (16) of the piston, and the piston shaft can push down the piston.

When the piston is in its uppermost position,
The secondary valve is closed and the gap is created. When the second valve seat is separated from the second valve body by the pressing operation of the head and the secondary valve is opened, the gap disappears,
The stem is pushed down integrally with the piston and moved downward against the biasing force. As a result, the primary valve is closed and the fluid in the cylinder is discharged to the outside.

When the stem and the piston are located at their lowermost positions, the secondary valve is open and the gap is not created. When the push-down operation of the head releases the push-down of the stem, the gap is generated, the second valve body is pressed against the second valve seat, and the secondary valve is closed. In this state, the stem is moved upward together with the piston. As a result, the primary valve is opened and the fluid in the container flows into the cylinder.

The cylindrical piston is generally made of soft resin. Therefore, this piston is deteriorated by creep over time. As a result, the sliding resistance of the piston with respect to the cylinder may be weaker than the sliding resistance other than the cylinder (for example, the sliding resistance between the piston and the piston shaft or the sliding resistance between the piston and the stem). Therefore, in the conventional case, when the stem starts moving upward from the lowermost position, the piston shaft is moved upward while the upper end (16) of the piston is attached to the lower end of the piston shaft. Therefore, the above gap is not generated, and the piston is moved upward together with the stem in a state where the secondary valve is opened. Therefore, the inside of the cylinder is not maintained at a negative pressure, and the fluid in the container is not introduced (sucked) into the cylinder, or even if sucked, a predetermined required amount of fluid is not sucked. After that, even if the head is pushed down, fluid may not be discharged from the cylinder to the outside at all, or a predetermined required amount of fluid may not be discharged. That is, there is a problem that the fluid is not reliably discharged and the discharge amount of the fluid is not stable.

[Object of the Invention] An object of the present invention is to reliably press the second valve body against the second valve seat when the piston starts to move upward together with the stem, thereby ensuring the secondary valve. It is an object of the present invention to provide a dispenser that is closed, discharges a fluid reliably, and can stably obtain a discharge amount of the fluid.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a dispenser according to the present invention includes a cylinder having a suction pipe, one end of which is inserted into a fluid contained in a container, and a first valve body. A primary valve that opens and closes the first valve seat to allow and block communication between the inside of the container and the inside of the cylinder via the suction pipe; and while sliding the outer peripheral surface against the inner peripheral surface of the cylinder. A cylindrical piston provided movably between one end and the other end in the axial direction of the cylinder and having a second valve seat formed therein; and a secondary valve that cooperates with the second valve seat. And a stem provided in the piston so as to be movable in the axial direction, and always urges the stem upward to press the second valve body against the second valve seat. And a biasing member that closes the secondary valve, and the spring located at one end of the cylinder. The system is moved in the direction of the other end of the cylinder while pressing against the biasing force, the second valve body is separated from the second valve seat to open the secondary valve, and then the stem and the piston To move toward the other end of the cylinder, and as a result, the primary valve is closed to discharge the fluid in the cylinder to the outside, and the stem located on the other end side of the cylinder. Is released to move the stem in the direction of one end of the cylinder, and the second valve body is pressed against the second valve seat by the urging force to close the secondary valve. The piston and the piston are integrally moved in the one end direction of the cylinder by an urging force, and as a result, the primary valve is opened to allow the fluid in the container to flow into the cylinder, a pressing unit for the stem and the piston, and From the other end of the cylinder, the piston When the piston and the stem integrally start moving in the one end direction of the cylinder, which is formed on the inner peripheral surface of the cylinder corresponding to the vicinity of the position where the movement of the da in the one end direction is started,
And a protrusion for surely closing the secondary valve by frictional force with the outer peripheral surface of the piston.

[Operation] In the present invention, the piston corresponds to the vicinity of the position where the piston starts moving from the other end side of the cylinder toward the one end of the cylinder.
A protrusion is formed on the inner peripheral surface of the cylinder. Therefore, when the stem starts to move toward one end, the protrusion frictions with the outer peripheral surface of the piston, so that the sliding resistance of the piston with respect to the inner peripheral surface of the cylinder is greater than the sliding resistance between the piston and the pressing member. growing. Therefore, when the stem starts moving in the one end direction, the piston is temporarily held at the predetermined position of the cylinder, so that a gap is reliably generated between the piston and the pressing member, The second valve body of the stem is surely pressed against the second valve seat of the piston, and the secondary valve is surely closed. That is, it is possible to prevent the piston and the stem from moving toward one end with the piston opened. Therefore, the cylinder is surely brought to a negative pressure, so that a predetermined necessary amount of fluid is surely flowed into the cylinder from the container. Therefore, when the fluid is discharged from the cylinder to the outside, the fluid is surely discharged, and the discharge amount of the fluid is stabilized.

[Explanation of Embodiments] FIGS. 1 to 3 show a dispenser according to an embodiment of the present invention. As shown in FIG.
The dispenser 1 includes a cylinder 3 housed in a container (not shown), a cylindrical piston 4 slidably provided in the cylinder 3, and a stem 5 movably provided in the piston 4. And a piston shaft 31 for pushing down the piston 4 and the stem 5.

The cylinder 3 includes a large diameter portion 6, a medium diameter portion 7 arranged below the large diameter portion 6, and a small diameter portion 8 arranged below the medium diameter portion 7. A cylinder chamber 3a is defined by the large diameter portion 6, the medium diameter portion 7, the piston 4 and the stem 5. The suction pipe 2 is fitted to the upper end of the small diameter portion 8. The lower end (not shown) of the suction pipe 2 is inserted into a fluid (liquid) contained in a container (not shown). A first valve seat 9 is formed between the small diameter portion 8 and the medium diameter portion 7. A ball 10 is arranged in this first valve seat 9. The ball 10 defines a first valve body, and cooperates with the first valve seat 9 to form a primary valve 11. Further, a step portion 12 is formed between the small diameter portion 8 and the medium diameter portion 7. This step 12
Defines the receiving of a biasing member 35 described later. A step portion 13 is formed between the large diameter portion 6 and the medium diameter portion 7. The step portion 13 defines the lowermost position of the stem 5.

The piston 4 includes a first tubular member 14 that slides with respect to the inner peripheral surface of the cylinder 3, and a second tubular member 15 provided inside the first tubular member 14. There is. A groove is provided between the upper side of the first tubular member 14 and the upper side of the second tubular member 15.
16 are formed. The inner peripheral surface of the lower end of the second tubular member 15 defines the second valve seat 17. This second valve seat 17
The second valve body 18 of the stem 5 cooperates to form a secondary valve 19. The upper and lower ends of the first tubular member 14 are pressed against the inner peripheral surface of the large diameter portion 6 of the cylinder 3. for that reason,
When the piston 4 moves in the vertical direction, the upper end and the lower end of the first tubular member 14 generate sliding resistance with respect to the inner peripheral surface of the large diameter portion 6. As shown in FIG. 1, when the second valve seat 17 is pressing against the second valve body 18, a gap P is formed between the lower end 33 of the piston shaft 31 and the bottom of the groove 16.
(For example, 1 mm) is specified. On the other hand, as shown in FIG. 2, when the secondary valve 19 is opened, the lower end 33 of the piston shaft 31 abuts the bottom of the groove 16 and can push the piston 4 downward. Further, the upper end of the second tubular member 15 presses the lower end 33 of the piston shaft 31. At this time, the pressing force of the upper end and the lower end of the first tubular member 14 is larger than the pressing force of the upper end of the second tubular member 15, so that when the piston shaft 31 is pushed down, the piston shaft 31 The piston 4 is not moved downward until the lower end 33 of the piston contacts the bottom of the groove 16.

The stem 5 has a hollow frustoconical portion 20 located therebelow.
Is equipped with. The outer peripheral surface of the frustoconical portion 20 defines the second valve body 18 as described above. A shaft portion 21 extends upward from the frustoconical portion 20. The top 22 of this shank 21
Are press-fitted inside the piston shaft 31. Further, the shaft portion 21 is formed with a flow path 23 extending in the vertical direction and through which a fluid flows. The step portion 24 formed at the lower end of the frustoconical portion 20 defines the receiving of the biasing member 35.

A cap 25 is attached to the top of the cylinder 3. The cap 25 includes a cylindrical outer flange 26 provided with an attaching / detaching means for attaching / detaching the dispenser at a neck portion (not shown) of the container, and a cylindrical inner flange 27 for guiding the piston shaft 31. It has and. When the piston 4 is located at the uppermost position, the lower end of the inner flange 27 is in contact with the upper end of the first tubular member 14 of the piston 4. Further, the cap 25 includes a member 28 for attaching the cap to the upper end of the cylinder 3 and a sealing member 29 for blocking the inside and the outside of the container when the cap is attached to the neck (not shown) of the container. Is equipped with. The member 28 is formed with a communication hole 30 for equalizing the pressure in the upper space of the cylinder 3 (space above the piston 4) and the pressure in the container.

Inside the piston shaft 31, there is formed a flow path 32 which is in communication with the flow path 23 of the stem 5 and which extends in the vertical direction. Furthermore, the cylindrical lower end 33 of this piston shaft is
The diameter has been slightly expanded. This allows the piston shaft 31
Is prevented from coming off from the inner flange 27 of the cap 25.

The piston shaft 31 is constantly biased upward by a biasing member, that is, a coil spring 35. That is, the coil spring 35 forms the step portion 12 between the medium diameter portion 7 and the small diameter portion 8.
And the stepped portion 24 of the stem 5 are interposed.

A nozzle head 36 is attached to the upper end of the piston shaft 31. The nozzle head 36 includes a head portion 37,
A nozzle 38 extending laterally from the head portion 37 is provided. A chamber 39 through which a fluid passes is formed in the head portion 37, and a flow path 40 for discharging the fluid to the outside is formed in the nozzle 38. The flow path 32 of the piston shaft 31, the chamber 39, and the flow path 40 are in communication with each other. The nozzle head 36 and the piston shaft 31 form a stem and piston pressing means.

In the present invention, the protrusion 50 is formed on the inner peripheral surface of the large diameter portion 6 of the cylinder 3 corresponding to the position where the piston 4 starts moving upward from the lowermost end position. This protrusion 50
Frictionally contacts the outer peripheral surface of the first tubular member 14 of the piston 4 to ensure that the secondary valve 19 is closed (this action will be described in detail later). In addition,
The protrusion 50 may be formed in an annular shape. Further, the height of the protrusion 50 is extremely low, and the shape thereof is formed smoothly. In addition, the projection 50 prevents the piston from being deformed and causing liquid leakage without suddenly changing the pressing force of the piston against the cylinder.
50 is formed.

Next, the operation of this dispenser, that is, the discharge operation will be described.

When not in use, the stem is pushed upward by the biasing force of the coil spring 35, so that the stem 5 is at the uppermost position (that is, in the scope of the claims, one end of the cylinder) as shown in FIG. ) Is located. At this time, the second valve body 18 of the stem 5 becomes the second valve seat of the piston 4.
The secondary valve 19 is closed by being pressed by 17. Furthermore, since the upper end of the first tubular member 14 of the piston 4 is pressed against the lower end of the inner flange 27 of the cap 25, when the movement of the piston 4 is restrained, the container is tumbled and Fluid does not leak outside.

When the stem 5 is located at the uppermost position, a gap P is present between the groove 16 of the piston 4 and the lower end 33 of the piston shaft 31. Therefore, the nozzle head 36
Is pushed down against the biasing force to push the stem 5 and start downward movement, the piston 4
Is not moved downwards. Therefore, the second valve body 18 is separated from the second valve seat 17, and the secondary valve 19 is opened. After that, the lower end 33 of the piston shaft 31 is in the groove 16 of the piston 4.
To press the piston 4 downward. With the secondary valve 19 opened, the stem 5 and the piston 4 are integrally pushed down against the biasing force. At this time, since the pressure in the cylinder 3 is applied to the ball 9, the primary valve 11 is closed. Therefore, the fluid in the cylinder 3 is the primary valve 19 and the flow path.
It is discharged to the outside through the chamber 23, the chamber 39, and the flow path 40.

As shown in FIG. 2, when the stem 5 comes into contact with the stepped portion 13 or the head portion 37 comes into contact with the top portion of the cap 25, the operation of discharging the fluid to the outside ends. That is, the stem is located at the lowest end position (that is, the other end side of the cylinder in the claims). After that, when the pressure on the nozzle head 36 is released, the stem 5 and the piston shaft 31 start moving upward due to the biasing force of the coil spring 35. Therefore, as shown in FIG. 3, when the stem 5 moves upward, the second valve body 18 is pressed against the second valve seat 17 and the secondary valve 19 is closed. Then, with the secondary valve 19 closed, the stem 5 and the piston 4 integrally move upward. Since the pressure in the cylinder chamber 3a becomes negative, the primary valve 11 is opened. Therefore, the fluid in the container flows into the cylinder chamber 3a via the suction pipe 2 and the primary valve 11.

Conventionally, the piston is deteriorated by creep, and the sliding resistance between the outer surface of the piston and the inner peripheral surface of the cylinder is the sliding resistance between the upper end of the second tubular member 14 and the lower end 33 of the piston shaft 31, or It may be made weaker than the sliding resistance between the piston 4 and the stem 5 or the sliding resistance between the piston 4 and the stem 5 or the like. Therefore, in the conventional case, the stem 5
When the upper end moves upward from the lowermost position, the second tubular member 14 of the piston 4 is attached to the lower end 33 of the piston shaft 31.
The piston shaft 31 is moved upward while the upper end of is attached. Therefore, the gap P does not occur and the secondary valve
The piston 4 is moved upward together with the stem 5 with 19 opened. Therefore, the negative pressure is not maintained in the cylinder chamber 3a, and the fluid in the container flows into the cylinder chamber 3a (suction).
If not, or even if aspirated, a predetermined required amount of fluid is not aspirated. Then, even if the nozzle head is pushed down, the fluid may not be discharged from the inside of the cylinder chamber 3a to the outside at all, or a predetermined required amount of the fluid may not be discharged. That is, there is a problem that the fluid is not reliably discharged to the outside and the discharge amount of the fluid is not stable.

On the other hand, in the present invention, the protrusion 50 is formed at a predetermined position of the cylinder 3. Therefore, when the stem 5 starts moving upward from the lowermost position, the projection 50 rubs against the outer peripheral surface of the first tubular member 14 of the piston 4 so that the upper end of the second tubular member 14 is The sliding resistance of the piston 4 to the inner peripheral surface of the cylinder 3 is larger than the sliding resistance of the lower end 33 of the piston shaft 31. Therefore, when the stem 5 starts moving upward from the lowermost position, the piston 4 is temporarily held at a predetermined position of the cylinder 3, so that the gap P is reliably generated. The second valve body 18 of the stem 5 is the second valve seat of the piston 4.
The secondary valve 19 is surely closed by being pressed by the positive valve 17. That is, the piston 4 and the stem 5 are prevented from moving upward with the piston 5 opened. Therefore, the inside of the cylinder chamber 3a surely becomes negative pressure, and as a result, a predetermined and necessary amount of fluid is surely sucked from the container into the cylinder chamber 3a. Therefore, when the fluid is discharged from the cylinder chamber 3a to the outside, the fluid is surely discharged and the discharge amount of the fluid is stabilized.

Note that once the stem 5 and the piston 4 are integrally moved upward, that is, once the negative pressure is generated in the cylinder chamber 3a, the second valve is moved during the movement of the stem and the piston. Zodiac 17
And the second valve body 18 is not separated from each other. for that reason,
The position where the protrusion 50 is provided may be provided only below the cylinder 3.

Further, FIG. 4 shows a modified example of the stem.
In this modified example, the flow path 60 and the second valve seat 61 are provided in the stem 5.
And are formed. This second valve seat 61 is used for the piston 4
The secondary valve 63 is constituted by the second valve body formed at the lower end of the second tubular member 15. Furthermore, the flow path between the lower end 64 of the first tubular member 14 and the frustoconical portion 65 of the stem 5 is always closed. Therefore, as shown in FIG. 4, when the secondary valve 63 is opened, the flow path 60, the secondary valve
The fluid flows in the flow path between the lower end 64 of the first tubular member 14 and the frustoconical portion 65. Therefore, the flow is improved as compared with the embodiment shown in FIGS. (The cross-sectional area of the channel is increased).

[Advantages of the Invention] The protrusion is formed at a predetermined position on the inner peripheral surface of the cylinder.
Therefore, as described above, when the piston and the stem start moving from the other end side of the cylinder (near the lowermost end position) toward one end of the cylinder (upward), the secondary valve is reliably closed. . Therefore, the fluid is surely discharged, and the discharge amount of the fluid is stably obtained.

[Brief description of drawings]

1 and 2 are sectional views of a dispenser according to an embodiment of the present invention, in which FIG. 1 shows the dispenser when it is not in use, and FIG. Figure showing the dispenser when lowered, 3rd
FIG. 4 is an enlarged view of the essential parts of the dispenser shown in FIGS. 1 and 2, showing the dispenser when the stem moves slightly upward from the lowermost position, and FIG. FIG. 7 is a sectional view of a dispenser according to a modified example of the present invention. 1 ... Dispenser, 2 ... Suction pipe, 3a ... Cylinder chamber (cylinder), 4 ... Piston, 5 ... Stem, 11
…… Primary valve, 17 …… Second valve seat, 18 …… Second valve body, 19
...... Secondary valve, 31 ...... Piston shaft (pressing means between stem and piston), 35 ...... Coil spring (biasing member), 36 ...... Nozzle head (pressing means between stem and piston), 50 ...... Protrusion.

Claims (1)

[Claims] 1. A cylinder having a suction pipe, one end of which is inserted into a fluid contained in a container, and a first valve body and a first valve seat are opened and closed to allow the inside of the container to pass through the suction pipe. A primary valve that allows and blocks communication with the inside of the cylinder; and a primary valve that is movable between one end and the other end in the axial direction of the cylinder while sliding the outer peripheral surface against the inner peripheral surface of the cylinder. And a second piston having a second valve seat formed therein, and a second valve body that constitutes a secondary valve in cooperation with the second valve seat, and axially moves in the piston. A stem that can be provided, an urging member that constantly urges the stem upward, and presses the second valve body against the second valve seat to close the secondary valve; and one end side of the cylinder The second valve body is moved while pushing the stem located at The second valve is opened apart from the second valve seat, and then the stem and the piston are integrally pressed to move toward the other end of the cylinder, and as a result, the primary valve is closed. To discharge the fluid in the cylinder to the outside, release the pressure of the stem located on the other end side of the cylinder to move the stem in the direction of one end of the cylinder, and to bias the second valve body to the first position. The second valve is closed by pressing the second valve seat, and then the stem and the piston are integrally moved by the urging force toward one end of the cylinder, and as a result, the primary valve is opened. Pressing means of the stem and the piston for causing the fluid in the container to flow into the cylinder, and the cylinder corresponding to the vicinity of the position where the piston starts moving from the other end side of the cylinder toward one end of the cylinder. On the inner surface of Is, when the said piston and the stem starts moving to the end direction integrally cylinder,
A dispenser comprising: a protrusion for surely closing the secondary valve by a frictional force with the outer peripheral surface of the piston.