JP2000213456A - Air spring for liquid pouring out pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a spring made of a metallic material and to simplify the fractionating work in the disposal after use by incorporating a bag body made of a thin film of a high polymer material between a depth bottom surface in a cylinder chamber of a liquid pouring out pump and a piston, and sealing the gas in this bag body to provide the same with the function as a compression spring. SOLUTION: A liquid pouring out pump 1 capable of pouring out the liquid such as shampoo, rinse and the like by a proper amount, comprises a cylinder 2 and a piston 3, and the direction control valves 4, 5 for controlling the liquid sucking and discharging direction are mounted on a depth bottom surface of the cylinder 2 and an interior of the piston 3. A compression spring is mounted between the depth bottom surface of the cylinder 2 and the interior of the piston 3, and this compression spring is formed by a bag body 6 made of a thin film of a high polymer material. This bag body 6 is divided into a plurality of stages, the gas is sealed in every layer, the layers are laminated, and a hole for passing the liquid therethrough, is formed on the center of the bag body 6. That is, the compression spring used for a metallic spring can be provided, and the pump can be easily sorted in the disposal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression spring used for a pump for dispensing an appropriate amount of liquid such as shampoo or rinse consumed at home or the like.

[0002]

2. Description of the Related Art A conventional liquid extraction pump such as a shampoo or a rinse is made of a synthetic resin for a container, a lid, a pump, a discharge passage, and the like. However, a metal compression spring is used for the pump. Used.

[0003]

However, in the case of using a metal spring, when the container is discarded when the shampoo or the like in the container has been used, the resin parts and the metal are used for environmental protection. There is a problem that the manufactured parts, that is, the metal springs, must be discarded separately. Therefore,
In the present invention, an intended purpose is achieved without using any metal material.

[0004]

According to the present invention, there is provided a liquid extraction pump having a built-in bag formed in a closed state with a thin film of a polymer material between a piston and a bottom surface in a cylinder chamber. An air spring for a liquid injection pump, characterized in that a compression spring is formed by filling gas, and the bag body and other pump components are prevented from slidingly contacting each other.

To explain the operation, when the piston sliding in the cylinder chamber is pushed to discharge the liquid in the cylinder chamber, the built-in bag body in contact with the piston surface is also compressed, and a certain set discharging is performed. When the pushing force of the piston is released after discharging the amount, the piston is pushed back to the original position by the pushed distance by the reaction force of the compressed gas in the bag body, and returns to the state before the pushing. The bag body contracts in volume when pressed by the piston, but the contraction of the volume is performed only in the direction of movement,
In the direction perpendicular to the direction of movement, that is, in the radial direction of the outer peripheral surface of the bag body, to prevent expansion deformation as much as possible,
Alternatively, the pump is made to move in close contact with other components constituting the pump so that the components and the thin film bag do not rub against each other. By doing this,
The bag and the other components are not slid and abraded, and the sealing gas is prevented from leaking and the compression reaction force is not damaged.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the relationship between the pump and its peripheral parts. The pump 1 for discharging the liquid is the same as the conventional one, and the cylinder 2 and the piston 3
Direction control valves 4 and 5 are provided on the inner bottom surface of the cylinder 2 and on the indoor side of the piston 3 to control the direction in which the liquid in the cylinder 2 is sucked and discharged. Although a compression spring is provided between the inner bottom surface of the cylinder 2 and the indoor surface of the piston 3, the compression spring is shown as a bag 6 in the present invention. The bag 6 is formed with an outer diameter that does not contact the inner surface of the cylinder 2. Such a pump 1 comprises a container 7
It is fixed so that there is no liquid leakage.

The relationship between the volume of the sealed gas in the bag body 6 and the pressure complies with Boyle-Scharl's law that the product of the original volume and the internal pressure is equal to the product of the changed volume and the internal pressure. Therefore, the internal pressure of the sealed gas after pressing and compressing the piston 3 increases in inverse proportion to the volume after compression. The head of the pump 1 is pushed to move the piston 3 downward. The volume in the cylinder 2 is reduced by the distance moved downward, and a corresponding amount of liquid is discharged from the head by opening the directional control valve 5. At this time, the bag 6 is also pushed, and the sealing pressure is increasing. The bag 6 is shown in FIGS.
4 will be described in detail.

The bag body 6 as a compression spring has a through hole 17 at the center thereof for allowing liquid to pass therethrough, and the bag body 6 is divided into a plurality of layers and laminated one by one. Gas is provided in a sealed manner. One embodiment of the bag constituting each layer is shown in detail in cross section in FIG. 3, and the cross section in another embodiment is shown in FIG.

3 and 4, the left side shows a normal height state, and the right side shows a state in which the pump head is pushed and the bag body 6 is compressed. In FIG. 3, on the inner and outer peripheral surfaces of the bag body 6,
Rings 8 and 9 are separately provided for the purpose of restraining the phenomenon of expansion and contraction in the radial direction.

The ring 8 restrains the bag body 6 from being compressed and expanding and deforming outward, and the ring 9 also restrains from contracting and deforming in the inner diameter direction. The rings 8 and 9 may be made of the same material as the bag 6. Even if the bag 6 is compressed by the distance indicated by the arrow 14, the outer diameter 15 and the inner diameter 16 of the bag 6 do not expand or contract greatly because the rings 8 and 9 are provided.

As another form of the rings 8 and 9, as shown in FIG. 4, outer ring bodies 10 and 11 are provided around the abdomen of the bag body.
The inner ring bodies 12 and 13 may be provided inside the bag body. The ring bodies 10 to 13 are all formed integrally with the bag body 6. The bag 6 in this embodiment is also indicated by an arrow 14.
Even if only the compression is performed, the outer diameter 15 and the inner diameter 16 of the bag 6 do not expand or contract because the rings 10 to 13 are provided.

In this embodiment, the bag 6 is divided into a plurality of layers and provided so as to facilitate the adjustment of the reaction force. However, the entire body may be formed as a single layer. Next, a bag according to a second embodiment will be described with reference to FIGS.

FIG. 5 is a half-section sectional view of the second embodiment, in which the bag body returns to its normal position by removing the force applied to the head of the pump, and the liquid is sucked into the cylinder. FIG. 6 also shows a state where a force is applied to the pump head to compress the bag body and the liquid is discharged out of the cylinder.

A bag 21 formed of a thin film of a polymer material
Is made of a non-stretchable thin film, the upper part of which is inserted into an outer cylinder 22 locked by a piston, and the lower part is pushed into a pedestal 23, and is provided in a sandwiched shape. Bag 2
1, a gas such as air is hermetically sealed.

The upper surface of the outer cylinder 22 is provided with a conductive portion 24 through which the internal solution flows, and the lower surface of the base 23 also has a conductive portion 2 through which the solution flows.
5 is provided. These parts are housed in a cylinder 26 and constitute a pump for discharging liquid. Next, the operation will be described.

When the piston is pushed, the outer cylinder 22 moves by a distance 27. The lower end of the outer cylinder 22 also moves a distance 28,
This amount is the same as the distance 27. The lower end of the bag body 21 has been in contact with the outer cylinder until then, peels off from the outer cylinder side and moves to the pedestal side, and due to its high internal pressure, closely contacts the outer peripheral surface of the pedestal 23. Displaced vertically. The displacement distance 29 is の of the distance 27.

The solution in the cylinder 26 is reduced by the sum of the volumes indicated by the hit points, that is, the sum of the volumes 30, 31, and 32, due to the pressing of the piston. That is, volume 3
0 indicates a volume in which the outer cylinder 22 and the inner surface of the cylinder decrease due to the movement of the piston, a volume 31 decreases as the outer cylinder 22 itself moves, and a volume 32 decreases as the bag body 21 comes down. The volume integrals are shown. 1
The amount by which the solution is pushed out of the cylinder 26 by pushing the piston twice, that is, the volume 30 may be appropriately determined by the inner diameter of the cylinder 26 and the outer diameter of the outer cylinder 22.

At this time, the gas pressure in the bag body increases in inverse proportion to the change in volume according to the above-mentioned Boyle-Scharl law. The reduced volume in the cylinder
It is discharged in the flow indicated by.

When the pressing force on the head is released and the applied force is released, the pressure in the bag body 21 pushes the outer cylinder 22 upward, and therefore, the biston is also pushed upward, thus reducing the volume. The same amount of content liquid is sucked into the cylinder,
Thus, one cycle of the operation is completed. It is necessary to provide a direction control valve also in this embodiment, but the description is omitted because it is duplicated.

[0020]

According to the present invention, a compression spring using gas can be obtained without using a metal spring. Since the bag as the compression spring is made of a thin film of a polymer material and is made of the same material as other components such as a pump, there is no need to perform a sorting operation at the time of disposal after use. Also, since the bag body as the compression spring is made so as not to slide with other components, it may slide and scratch each other to leak the sealing gas and impair the compression reaction force. Absent.

[Brief description of the drawings]

FIG. 1 is an assembled sectional view showing the relationship between a pump and its peripheral parts.

FIG. 2 is a conceptual diagram showing the entire bag according to the first embodiment.

FIG. 3 is a cross-sectional view showing one embodiment of a bag.

FIG. 4 is a sectional view showing another embodiment of the bag.

FIG. 5 is a sectional assembly view showing a second embodiment.

FIG. 6 is an assembled sectional view of Embodiment 2 at the time of compression.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Cylinder 3 Piston 4,5 Direction control valve 6 Bag 7 Container 8,9 Ring 10 Outer diameter side ring 11 Inner example side ring 12,13 Inner ring 14 Arrow 15 Outer diameter 16 Inner diameter 17 Hole 21 Bag 22 Outer cylinder 23 Pedestal 24, 25 Conductor 26 Cylinder 27, 28, 29 Distance 30, 31, 32 Volume

Claims (1)

[Claims] In a liquid injection pump, a bag is formed between a piston and a bottom surface in a cylinder chamber to form a sealed state with a thin film of a polymer material, and the bag is compressed by filling gas. An air spring for a liquid extraction pump, wherein a spring is provided so that the bag body and other pump components do not come into sliding contact with each other.