JP2000257564A - Disposal fluid fixed amount extracting mechanism by bellows pump with check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent liquid from flowing out even in an open condition by such pressure as gravitational force in the direction of flow and obtain accurate check performance by providing a special semi-spherical check valve in which a hole is opened in the middle thereof. SOLUTION: A pair of check valves 20 are provided at both ends of a bellows pump main body 10, and a soft sealing vessel 30 is provided on a fluid flowing-in side of the check valve 20. The check valve 20 is formed as follows. First, a semi-spherical valve base 21 is provided, and a fringe of a semi-spherical valve 22 of a rubberlike elastic body is fixed on the semi-spherical valve base 21. This semi-spherical valve 22 has such shape that covers a spherical face of the semi-spherical valve base 21 in a close adhesion condition. Furthermore, a thickness of the semi-spherical valve 22 is reduced when approaching its central part, and the vicinity of the center is emptied circularly and has an emptied part 22b. A fluid passing through hole is provided in the middle of the semi-spherical valve base 21 in a condition in which it passes through from its plane part to its semi-spherical face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a pump for taking out a fixed amount of fluid such as liquid such as soft drink and other gas, and more particularly to a disposable pump. More particularly, it relates to a highly sealed pump.

[0002]

2. Description of the Related Art Conventionally, check valves of bellows pumps are often of a flat plate type. In the case where the bellows is not a flat plate, a mechanism is provided in which both ends of the bellows are pushed and closed or pulled open by an external pressure.

[0003]

In the former case, the mechanism is simple and the valve opens and closes automatically, so that it is inexpensive and easy to use. However, there is a drawback that liquid leaks easily from the valve. On the other hand, in the case of the latter, the mechanism becomes complicated, a synchronous circuit is also required, and problems of cost and difficulty in miniaturization arise.

[0004]

According to the present invention, there is provided a disposable fluid metering and extraction mechanism using a bellows pump with a check valve according to the present invention.
In view of the above technical problems, the valve base is made hemispherical, the valve body is shaped into a spherical surface of the hemispherical valve base, and the edge is fixed to the valve base. The valve body had a shape that became thinner toward its center, and had a circular shape near its center.

Hereinafter, a specific configuration of a disposable fluid metering and extraction mechanism using a bellows pump with a check valve according to the present invention will be described in detail. First, the configuration of the invention described in claim 1 of the present invention will be described. The present invention has a bellows pump main body. Next, there is a pair of check valves. The pair of check valves are provided at both ends of the bellows pump body.

[0006] Thus, the above check valve has a hemispherical valve base. Next, there is a hemispherical valve made of an elastic material such as rubber. The elastic hemispherical valve such as rubber has its edge fixed to the above-mentioned hemispherical valve base,
It is of a shape that covers the spherical surface of the above-mentioned hemispherical valve base in close contact, and its thickness becomes thinner toward its center, and the center is missing a circle. is there. And there is a fluid through-hole. The fluid through-hole is provided in the middle of the above-mentioned hemispherical valve base so as to penetrate from the plane portion to the hemispherical surface. Consisting of the above.

Next, the construction of the invention according to claim 2 of the disposable fluid quantitative extraction mechanism using the bellows pump with a check valve according to the present invention will be described. The present invention is the same as the configuration of the first aspect of the present invention except for the following points. Therefore, the entire description of the configuration of the invention of claim 1 is incorporated herein, and the following description of the configuration is added thereto. The difference between the present invention and the configuration of the first aspect of the present invention is the presence of a flexible sealed container. This flexible sealed container is provided on the fluid inflow side of the check valve.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A general embodiment of a disposable fluid metering and extraction mechanism using a bellows pump with a check valve according to the present invention will be described below. A pair of check valves 20 in the same direction
Are provided at both ends of the bellows pump body 10, and a flexible sealed container (BIB) 30 is provided on the fluid inflow side of the check valve 20.

The check valve 20 is configured as follows. First, there is a valve base 21 having a hemispherical shape with a flange 21a, and there is also an elastic hemispherical valve 22 such as rubber with a flange 22a. The elastic hemispherical valve 22 such as rubber is formed by fixing an edge serving as the flange 22a to the flange 21a of the above-mentioned hemispherical valve base 21. And the spherical surface 2 of the above-mentioned hemispherical valve base 21
1b. further,
The thickness of the hemispherical valve 22 becomes thinner toward the center thereof, and the center of the hemispherical valve 22 is cut off in a circular shape and has a missing portion 22b.

[0010] Fluid through-holes 23 whose cross-sections are arranged in a "C" shape are provided radially. This fluid through hole 23
Is located in the middle of the above-mentioned hemispherical valve base 21 with its flat portion 2
1c is provided in a penetrating state from the hemispherical surface 21b.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a bellows pump equipped with a check valve according to the present invention. First, a bellows pump main body 10 made of a bellows-like soft resin is provided as shown in a partial cross-sectional front view of one embodiment of a disposable fluid quantitative extraction mechanism using a bellows pump with a check valve of the present invention shown in FIG. Next, there is a pair of check valves 20.
The pair of check valves 20 are connected to the bellows pump body 1 described above.
0 are provided at both ends of the inflow / outflow port. And
Flexible sealed container (BIB) 30 for containing a fluid such as a soft drink
There is. As shown in FIG. 1, the flexible sealed container 30 is provided on the fluid inflow side of the check valve 20 described above. The above-mentioned components are integrally formed, and when the fluid such as the soft drink in the soft sealed container 30 is used up, the whole is disposable. Then
The check valves 20 are provided in a same pair in two directions and are directed in the same direction.

The check valve 20 is configured as follows. First, as shown in an enlarged sectional view of the part shown in FIGS. 2 and 3 and a plan view shown in FIG.
There is a valve base 21 in the shape of 1a. Next, a hemispherical valve 22 made of an elastic material such as rubber having a flange 22a is also used.
There is. The elastic hemispherical valve 22 such as rubber is attached to the flange 21a of the above-described hemispherical valve base 21 by the flange 22a.
The edge serving as a is fixed. The valve base 21 is shaped so as to cover the spherical surface 21b of the hemispherical valve base 21 in close contact therewith. Further, this hemispherical valve 22 is similar to that of FIG.
As shown in (3) and (3), the thickness becomes thinner toward the center, and the center is cut off in a circular shape and has a cut-off portion 22b.

A plurality of fluid through-holes 23 whose cross sections are arranged in a "C" shape are radially provided. As shown in FIGS. 2 and 3, the fluid through hole 23 extends from the flat portion 21c to the hemispherical surface 21c in the middle of the above-mentioned hemispherical valve base 21.
b is provided in a penetrating state. The cross section of the fluid through-hole 23 may be vertically provided instead of being arranged in a “C” shape as shown in the figure. In this case, the manufacture is easy, but since the tip of the fluid through hole 23 that contacts the hemispherical valve 22 becomes elliptical, there is a possibility that the liquid leaks easily.

[0014]

As described above, the disposable fluid metering and extraction mechanism using the bellows pump with a check valve according to the present invention has been accomplished as described above. That is, it is a fluid quantitative extraction mechanism using a container provided with a bellows pump having a check valve, and has high precision quantitativeness because of the bellows pump. And since it is a special hemispherical check valve with a hole in the center, the liquid does not flow out even in the open state with a small pressure such as gravity in the direction of flow, and accurate check performance can be obtained. Does not flow at the position). Furthermore, since the valve has a hole in the center, the periphery of the valve can be provided with sealing performance. And since it has a disposable check valve, dangerous liquids and liquids which are difficult to wash can be discarded as they are after use.

[Brief description of the drawings]

FIG. 1 is a front partial cross-sectional view of one embodiment of a disposable fluid quantitative extraction mechanism using a bellows pump with a check valve according to the present invention.

FIG. 2 is an enlarged front sectional view of a check valve portion of FIG. 1, showing a state in which a valve main body is closed.

FIG. 3 is an enlarged front sectional view of a check valve portion of FIG. 1, showing a state where a valve main body is opened.

FIG. 4 is a plan view of the one shown in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Bellows pump body 22 Hemispherical valve 20 Check valve 30 Flexible sealed container 21 Valve base

Claims (2)

[Claims] 1. A disposable fluid metering and extraction mechanism using a bellows pump having a check valve, comprising: a bellows pump body; and a pair of the following check valves provided at both ends of the bellows pump body. The above-mentioned check valve has a hemispherical valve base, an edge of which is fixed to the hemispherical valve base, and a shape which covers the spherical surface of the above-mentioned hemispherical valve base in an intimate manner. An elastic hemispherical valve, such as rubber, whose center is thinned and its center becomes thinner, and the center of which is circularly missing, in the middle of the above-mentioned hemispherical valve base. A fluid through-hole provided in a penetrating state from the plane portion to the hemisphere. 2. A bellows pump main body, a pair of the following check valves provided at both ends of the bellows pump main body, and a flexible sealed container provided on a fluid inflow side of the following check valve. Disposable fluid quantitative extraction mechanism by bellows pump with check valve. The above-mentioned check valve has a hemispherical valve base, an edge of which is fixed to the hemispherical valve base, and a shape which covers the spherical surface of the above-mentioned hemispherical valve base in an intimate manner. An elastic hemispherical valve, such as rubber, whose center is thinned and its center becomes thinner, and the center of which is circularly missing, in the middle of the above-mentioned hemispherical valve base. A fluid through-hole provided in a penetrating state from the plane portion to the hemisphere.